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omap24xx: Start watchdog with RT priority
[openwrt.git] / target / linux / omap24xx / patches-2.6.37 / 500-cbus.patch
1 ---
2 arch/arm/Kconfig | 4
3 drivers/Makefile | 2
4 drivers/cbus/Kconfig | 89 ++++
5 drivers/cbus/Makefile | 14
6 drivers/cbus/cbus.c | 309 ++++++++++++++++
7 drivers/cbus/cbus.h | 36 +
8 drivers/cbus/retu-headset.c | 356 ++++++++++++++++++
9 drivers/cbus/retu-pwrbutton.c | 118 ++++++
10 drivers/cbus/retu-rtc.c | 477 ++++++++++++++++++++++++
11 drivers/cbus/retu-user.c | 424 ++++++++++++++++++++++
12 drivers/cbus/retu-wdt.c | 387 ++++++++++++++++++++
13 drivers/cbus/retu.c | 468 ++++++++++++++++++++++++
14 drivers/cbus/retu.h | 77 ++++
15 drivers/cbus/tahvo-usb.c | 788 +++++++++++++++++++++++++++++++++++++++++
16 drivers/cbus/tahvo-user.c | 406 +++++++++++++++++++++
17 drivers/cbus/tahvo.c | 443 +++++++++++++++++++++++
18 drivers/cbus/tahvo.h | 61 +++
19 drivers/cbus/user_retu_tahvo.h | 75 +++
20 18 files changed, 4533 insertions(+), 1 deletion(-)
21
22 Index: linux-2.6.37/drivers/cbus/cbus.c
23 ===================================================================
24 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
25 +++ linux-2.6.37/drivers/cbus/cbus.c 2011-01-27 14:17:39.085000008 +0100
26 @@ -0,0 +1,309 @@
27 +/*
28 + * drivers/cbus/cbus.c
29 + *
30 + * Support functions for CBUS serial protocol
31 + *
32 + * Copyright (C) 2004, 2005 Nokia Corporation
33 + *
34 + * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
35 + * David Weinehall <david.weinehall@nokia.com>, and
36 + * Mikko Ylinen <mikko.k.ylinen@nokia.com>
37 + *
38 + * This file is subject to the terms and conditions of the GNU General
39 + * Public License. See the file "COPYING" in the main directory of this
40 + * archive for more details.
41 + *
42 + * This program is distributed in the hope that it will be useful,
43 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
44 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
45 + * GNU General Public License for more details.
46 + *
47 + * You should have received a copy of the GNU General Public License
48 + * along with this program; if not, write to the Free Software
49 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
50 + */
51 +
52 +#include <linux/device.h>
53 +#include <linux/init.h>
54 +#include <linux/kernel.h>
55 +#include <linux/delay.h>
56 +#include <linux/spinlock.h>
57 +#include <linux/gpio.h>
58 +#include <linux/platform_device.h>
59 +#include <linux/slab.h>
60 +
61 +#include <asm/io.h>
62 +#include <asm/mach-types.h>
63 +
64 +#include <plat/board.h>
65 +#include <plat/cbus.h>
66 +
67 +#include "cbus.h"
68 +
69 +struct cbus_host *cbus_host = NULL;
70 +EXPORT_SYMBOL(cbus_host);
71 +
72 +#ifdef CONFIG_ARCH_OMAP1
73 +/* We use our own MPUIO functions to get closer to 1MHz bus speed */
74 +
75 +static inline void cbus_set_gpio_direction(u32 base, int mpuio, int is_input)
76 +{
77 + u16 w;
78 +
79 + mpuio &= 0x0f;
80 + w = __raw_readw(base + OMAP_MPUIO_IO_CNTL);
81 + if (is_input)
82 + w |= 1 << mpuio;
83 + else
84 + w &= ~(1 << mpuio);
85 + __raw_writew(w, base + OMAP_MPUIO_IO_CNTL);
86 +
87 +}
88 +
89 +static inline void cbus_set_gpio_dataout(u32 base, int mpuio, int enable)
90 +{
91 + u16 w;
92 +
93 + mpuio &= 0x0f;
94 + w = __raw_readw(base + OMAP_MPUIO_OUTPUT);
95 + if (enable)
96 + w |= 1 << mpuio;
97 + else
98 + w &= ~(1 << mpuio);
99 + __raw_writew(w, base + OMAP_MPUIO_OUTPUT);
100 +}
101 +
102 +static inline int cbus_get_gpio_datain(u32 base, int mpuio)
103 +{
104 + mpuio &= 0x0f;
105 +
106 + return (__raw_readw(base + OMAP_MPUIO_INPUT_LATCH) & (1 << mpuio)) != 0;
107 +}
108 +
109 +static void cbus_send_bit(struct cbus_host *host, u32 base, int bit,
110 + int set_to_input)
111 +{
112 + cbus_set_gpio_dataout(base, host->dat_gpio, bit ? 1 : 0);
113 + cbus_set_gpio_dataout(base, host->clk_gpio, 1);
114 +
115 + /* The data bit is read on the rising edge of CLK */
116 + if (set_to_input)
117 + cbus_set_gpio_direction(base, host->dat_gpio, 1);
118 +
119 + cbus_set_gpio_dataout(base, host->clk_gpio, 0);
120 +}
121 +
122 +static u8 cbus_receive_bit(struct cbus_host *host, u32 base)
123 +{
124 + u8 ret;
125 +
126 + cbus_set_gpio_dataout(base, host->clk_gpio, 1);
127 + ret = cbus_get_gpio_datain(base, host->dat_gpio);
128 + cbus_set_gpio_dataout(base, host->clk_gpio, 0);
129 +
130 + return ret;
131 +}
132 +
133 +#define cbus_output(base, gpio, val) cbus_set_gpio_direction(base, gpio, 0)
134 +
135 +#else
136 +
137 +#define cbus_output(base, gpio, val) gpio_direction_output(gpio, val)
138 +#define cbus_set_gpio_dataout(base, gpio, enable) gpio_set_value(gpio, enable)
139 +#define cbus_get_gpio_datain(base, int, gpio) gpio_get_value(gpio)
140 +
141 +static void _cbus_send_bit(struct cbus_host *host, int bit, int set_to_input)
142 +{
143 + gpio_set_value(host->dat_gpio, bit ? 1 : 0);
144 + gpio_set_value(host->clk_gpio, 1);
145 +
146 + /* The data bit is read on the rising edge of CLK */
147 + if (set_to_input)
148 + gpio_direction_input(host->dat_gpio);
149 +
150 + gpio_set_value(host->clk_gpio, 0);
151 +}
152 +
153 +static u8 _cbus_receive_bit(struct cbus_host *host)
154 +{
155 + u8 ret;
156 +
157 + gpio_set_value(host->clk_gpio, 1);
158 + ret = gpio_get_value(host->dat_gpio);
159 + gpio_set_value(host->clk_gpio, 0);
160 +
161 + return ret;
162 +}
163 +
164 +#define cbus_send_bit(host, base, bit, set_to_input) _cbus_send_bit(host, bit, set_to_input)
165 +#define cbus_receive_bit(host, base) _cbus_receive_bit(host)
166 +
167 +#endif
168 +
169 +static int cbus_transfer(struct cbus_host *host, int dev, int reg, int data)
170 +{
171 + int i;
172 + int is_read = 0;
173 + unsigned long flags;
174 + u32 base;
175 +
176 +#ifdef CONFIG_ARCH_OMAP1
177 + base = OMAP1_IO_ADDRESS(OMAP1_MPUIO_BASE);
178 +#else
179 + base = 0;
180 +#endif
181 +
182 + if (data < 0)
183 + is_read = 1;
184 +
185 + /* We don't want interrupts disturbing our transfer */
186 + spin_lock_irqsave(&host->lock, flags);
187 +
188 + /* Reset state and start of transfer, SEL stays down during transfer */
189 + cbus_set_gpio_dataout(base, host->sel_gpio, 0);
190 +
191 + /* Set the DAT pin to output */
192 + cbus_output(base, host->dat_gpio, 1);
193 +
194 + /* Send the device address */
195 + for (i = 3; i > 0; i--)
196 + cbus_send_bit(host, base, dev & (1 << (i - 1)), 0);
197 +
198 + /* Send the rw flag */
199 + cbus_send_bit(host, base, is_read, 0);
200 +
201 + /* Send the register address */
202 + for (i = 5; i > 0; i--) {
203 + int set_to_input = 0;
204 +
205 + if (is_read && i == 1)
206 + set_to_input = 1;
207 +
208 + cbus_send_bit(host, base, reg & (1 << (i - 1)), set_to_input);
209 + }
210 +
211 + if (!is_read) {
212 + for (i = 16; i > 0; i--)
213 + cbus_send_bit(host, base, data & (1 << (i - 1)), 0);
214 + } else {
215 + cbus_set_gpio_dataout(base, host->clk_gpio, 1);
216 + data = 0;
217 +
218 + for (i = 16; i > 0; i--) {
219 + u8 bit = cbus_receive_bit(host, base);
220 +
221 + if (bit)
222 + data |= 1 << (i - 1);
223 + }
224 + }
225 +
226 + /* Indicate end of transfer, SEL goes up until next transfer */
227 + cbus_set_gpio_dataout(base, host->sel_gpio, 1);
228 + cbus_set_gpio_dataout(base, host->clk_gpio, 1);
229 + cbus_set_gpio_dataout(base, host->clk_gpio, 0);
230 +
231 + spin_unlock_irqrestore(&host->lock, flags);
232 +
233 + return is_read ? data : 0;
234 +}
235 +
236 +/*
237 + * Read a given register from the device
238 + */
239 +int cbus_read_reg(struct cbus_host *host, int dev, int reg)
240 +{
241 + return cbus_host ? cbus_transfer(host, dev, reg, -1) : -ENODEV;
242 +}
243 +EXPORT_SYMBOL(cbus_read_reg);
244 +
245 +/*
246 + * Write to a given register of the device
247 + */
248 +int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val)
249 +{
250 + return cbus_host ? cbus_transfer(host, dev, reg, (int)val) : -ENODEV;
251 +}
252 +EXPORT_SYMBOL(cbus_write_reg);
253 +
254 +static int __init cbus_bus_probe(struct platform_device *pdev)
255 +{
256 + struct cbus_host *chost;
257 + struct cbus_host_platform_data *pdata = pdev->dev.platform_data;
258 + int ret;
259 +
260 + chost = kzalloc(sizeof (*chost), GFP_KERNEL);
261 + if (chost == NULL)
262 + return -ENOMEM;
263 +
264 + spin_lock_init(&chost->lock);
265 +
266 + chost->clk_gpio = pdata->clk_gpio;
267 + chost->dat_gpio = pdata->dat_gpio;
268 + chost->sel_gpio = pdata->sel_gpio;
269 +
270 + if ((ret = gpio_request(chost->clk_gpio, "CBUS clk")) < 0)
271 + goto exit1;
272 +
273 + if ((ret = gpio_request(chost->dat_gpio, "CBUS data")) < 0)
274 + goto exit2;
275 +
276 + if ((ret = gpio_request(chost->sel_gpio, "CBUS sel")) < 0)
277 + goto exit3;
278 +
279 + gpio_direction_output(chost->clk_gpio, 0);
280 + gpio_direction_input(chost->dat_gpio);
281 + gpio_direction_output(chost->sel_gpio, 1);
282 +
283 + gpio_set_value(chost->clk_gpio, 1);
284 + gpio_set_value(chost->clk_gpio, 0);
285 +
286 + platform_set_drvdata(pdev, chost);
287 +
288 + cbus_host = chost;
289 +
290 + return 0;
291 +exit3:
292 + gpio_free(chost->dat_gpio);
293 +exit2:
294 + gpio_free(chost->clk_gpio);
295 +exit1:
296 + kfree(chost);
297 +
298 + return ret;
299 +}
300 +
301 +static void __exit cbus_bus_remove(struct platform_device *pdev)
302 +{
303 + struct cbus_host *chost = platform_get_drvdata(pdev);
304 +
305 + gpio_free(chost->dat_gpio);
306 + gpio_free(chost->clk_gpio);
307 + kfree(chost);
308 +}
309 +
310 +static struct platform_driver cbus_driver = {
311 + .remove = __exit_p(cbus_bus_remove),
312 + .driver = {
313 + .name = "cbus",
314 + },
315 +};
316 +
317 +static int __init cbus_bus_init(void)
318 +{
319 + return platform_driver_probe(&cbus_driver, cbus_bus_probe);
320 +}
321 +
322 +subsys_initcall(cbus_bus_init);
323 +
324 +static void __exit cbus_bus_exit(void)
325 +{
326 + platform_driver_unregister(&cbus_driver);
327 +}
328 +module_exit(cbus_bus_exit);
329 +
330 +MODULE_DESCRIPTION("CBUS serial protocol");
331 +MODULE_LICENSE("GPL");
332 +MODULE_AUTHOR("Juha Yrjölä");
333 +MODULE_AUTHOR("David Weinehall");
334 +MODULE_AUTHOR("Mikko Ylinen");
335 +
336 Index: linux-2.6.37/drivers/cbus/cbus.h
337 ===================================================================
338 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
339 +++ linux-2.6.37/drivers/cbus/cbus.h 2011-01-27 14:17:39.085000008 +0100
340 @@ -0,0 +1,36 @@
341 +/*
342 + * drivers/cbus/cbus.h
343 + *
344 + * Copyright (C) 2004, 2005 Nokia Corporation
345 + *
346 + * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
347 + * David Weinehall <david.weinehall@nokia.com>
348 + *
349 + * This file is subject to the terms and conditions of the GNU General
350 + * Public License. See the file "COPYING" in the main directory of this
351 + * archive for more details.
352 + *
353 + * This program is distributed in the hope that it will be useful,
354 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
355 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
356 + * GNU General Public License for more details.
357 + *
358 + * You should have received a copy of the GNU General Public License
359 + * along with this program; if not, write to the Free Software
360 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
361 + */
362 +
363 +#ifndef __DRIVERS_CBUS_CBUS_H
364 +#define __DRIVERS_CBUS_CBUS_H
365 +
366 +struct cbus_host {
367 + int clk_gpio, dat_gpio, sel_gpio;
368 + spinlock_t lock;
369 +};
370 +
371 +extern struct cbus_host *cbus_host;
372 +
373 +extern int cbus_read_reg(struct cbus_host *host, int dev, int reg);
374 +extern int cbus_write_reg(struct cbus_host *host, int dev, int reg, u16 val);
375 +
376 +#endif /* __DRIVERS_CBUS_CBUS_H */
377 Index: linux-2.6.37/drivers/cbus/Kconfig
378 ===================================================================
379 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
380 +++ linux-2.6.37/drivers/cbus/Kconfig 2011-01-27 14:17:39.085000008 +0100
381 @@ -0,0 +1,89 @@
382 +#
383 +# CBUS device configuration
384 +#
385 +
386 +menu "CBUS support"
387 +
388 +config CBUS
389 + depends on ARCH_OMAP
390 + bool "CBUS support on OMAP"
391 + ---help---
392 + CBUS is a proprietary serial protocol by Nokia. It is mainly
393 + used for accessing Energy Management auxiliary chips.
394 +
395 + If you want CBUS support, you should say Y here.
396 +
397 +config CBUS_TAHVO
398 + depends on CBUS
399 + bool "Support for Tahvo"
400 + ---help---
401 + Tahvo is a mixed signal ASIC with some system features
402 +
403 + If you want Tahvo support, you should say Y here.
404 +
405 +config CBUS_TAHVO_USER
406 + depends on CBUS_TAHVO
407 + bool "Support for Tahvo user space functions"
408 + ---help---
409 + If you want support for Tahvo's user space read/write etc. functions,
410 + you should say Y here.
411 +
412 +config CBUS_TAHVO_USB
413 + depends on CBUS_TAHVO && USB
414 + tristate "Support for Tahvo USB transceiver"
415 + ---help---
416 + If you want Tahvo support for USB transceiver, say Y or M here.
417 +
418 +config CBUS_TAHVO_USB_HOST_BY_DEFAULT
419 + depends on CBUS_TAHVO_USB && USB_OTG
420 + boolean "Device in USB host mode by default"
421 + ---help---
422 + Say Y here, if you want the device to enter USB host mode
423 + by default on bootup.
424 +
425 +config CBUS_RETU
426 + depends on CBUS
427 + bool "Support for Retu"
428 + ---help---
429 + Retu is a mixed signal ASIC with some system features
430 +
431 + If you want Retu support, you should say Y here.
432 +
433 +config CBUS_RETU_USER
434 + depends on CBUS_RETU
435 + bool "Support for Retu user space functions"
436 + ---help---
437 + If you want support for Retu's user space read/write etc. functions,
438 + you should say Y here.
439 +
440 +config CBUS_RETU_POWERBUTTON
441 + depends on CBUS_RETU
442 + bool "Support for Retu power button"
443 + ---help---
444 + The power button on Nokia 770 is connected to the Retu ASIC.
445 +
446 + If you want support for the Retu power button, you should say Y here.
447 +
448 +config CBUS_RETU_RTC
449 + depends on CBUS_RETU && SYSFS
450 + tristate "Support for Retu pseudo-RTC"
451 + ---help---
452 + Say Y here if you want support for the device that alleges to be an
453 + RTC in Retu. This will expose a sysfs interface for it.
454 +
455 +config CBUS_RETU_WDT
456 + depends on CBUS_RETU && SYSFS && WATCHDOG
457 + tristate "Support for Retu watchdog timer"
458 + ---help---
459 + Say Y here if you want support for the watchdog in Retu. This will
460 + expose a sysfs interface to grok it.
461 +
462 +config CBUS_RETU_HEADSET
463 + depends on CBUS_RETU && SYSFS
464 + tristate "Support for headset detection with Retu/Vilma"
465 + ---help---
466 + Say Y here if you want support detecting a headset that's connected
467 + to Retu/Vilma. Detection state and events are exposed through
468 + sysfs.
469 +
470 +endmenu
471 Index: linux-2.6.37/drivers/cbus/Makefile
472 ===================================================================
473 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
474 +++ linux-2.6.37/drivers/cbus/Makefile 2011-01-27 14:17:39.085000008 +0100
475 @@ -0,0 +1,14 @@
476 +#
477 +# Makefile for CBUS.
478 +#
479 +
480 +obj-$(CONFIG_CBUS) += cbus.o
481 +obj-$(CONFIG_CBUS_TAHVO) += tahvo.o
482 +obj-$(CONFIG_CBUS_RETU) += retu.o
483 +obj-$(CONFIG_CBUS_TAHVO_USB) += tahvo-usb.o
484 +obj-$(CONFIG_CBUS_RETU_POWERBUTTON) += retu-pwrbutton.o
485 +obj-$(CONFIG_CBUS_RETU_RTC) += retu-rtc.o
486 +obj-$(CONFIG_CBUS_RETU_WDT) += retu-wdt.o
487 +obj-$(CONFIG_CBUS_TAHVO_USER) += tahvo-user.o
488 +obj-$(CONFIG_CBUS_RETU_USER) += retu-user.o
489 +obj-$(CONFIG_CBUS_RETU_HEADSET) += retu-headset.o
490 Index: linux-2.6.37/drivers/cbus/retu.c
491 ===================================================================
492 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
493 +++ linux-2.6.37/drivers/cbus/retu.c 2011-01-27 14:17:39.085000008 +0100
494 @@ -0,0 +1,468 @@
495 +/**
496 + * drivers/cbus/retu.c
497 + *
498 + * Support functions for Retu ASIC
499 + *
500 + * Copyright (C) 2004, 2005 Nokia Corporation
501 + *
502 + * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
503 + * David Weinehall <david.weinehall@nokia.com>, and
504 + * Mikko Ylinen <mikko.k.ylinen@nokia.com>
505 + *
506 + * This file is subject to the terms and conditions of the GNU General
507 + * Public License. See the file "COPYING" in the main directory of this
508 + * archive for more details.
509 + *
510 + * This program is distributed in the hope that it will be useful,
511 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
512 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
513 + * GNU General Public License for more details.
514 + *
515 + * You should have received a copy of the GNU General Public License
516 + * along with this program; if not, write to the Free Software
517 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
518 + */
519 +
520 +#include <linux/module.h>
521 +#include <linux/init.h>
522 +
523 +#include <linux/kernel.h>
524 +#include <linux/errno.h>
525 +#include <linux/device.h>
526 +#include <linux/miscdevice.h>
527 +#include <linux/poll.h>
528 +#include <linux/fs.h>
529 +#include <linux/irq.h>
530 +#include <linux/interrupt.h>
531 +#include <linux/platform_device.h>
532 +#include <linux/gpio.h>
533 +
534 +#include <asm/uaccess.h>
535 +#include <asm/mach-types.h>
536 +
537 +#include <plat/mux.h>
538 +#include <plat/board.h>
539 +
540 +#include "cbus.h"
541 +#include "retu.h"
542 +
543 +#define RETU_ID 0x01
544 +#define PFX "retu: "
545 +
546 +static int retu_initialized;
547 +static int retu_irq_pin;
548 +static int retu_is_vilma;
549 +
550 +static struct tasklet_struct retu_tasklet;
551 +spinlock_t retu_lock = SPIN_LOCK_UNLOCKED;
552 +
553 +static struct completion device_release;
554 +
555 +struct retu_irq_handler_desc {
556 + int (*func)(unsigned long);
557 + unsigned long arg;
558 + char name[8];
559 +};
560 +
561 +static struct retu_irq_handler_desc retu_irq_handlers[MAX_RETU_IRQ_HANDLERS];
562 +
563 +/**
564 + * retu_read_reg - Read a value from a register in Retu
565 + * @reg: the register to read from
566 + *
567 + * This function returns the contents of the specified register
568 + */
569 +int retu_read_reg(int reg)
570 +{
571 + BUG_ON(!retu_initialized);
572 + return cbus_read_reg(cbus_host, RETU_ID, reg);
573 +}
574 +
575 +/**
576 + * retu_write_reg - Write a value to a register in Retu
577 + * @reg: the register to write to
578 + * @reg: the value to write to the register
579 + *
580 + * This function writes a value to the specified register
581 + */
582 +void retu_write_reg(int reg, u16 val)
583 +{
584 + BUG_ON(!retu_initialized);
585 + cbus_write_reg(cbus_host, RETU_ID, reg, val);
586 +}
587 +
588 +void retu_set_clear_reg_bits(int reg, u16 set, u16 clear)
589 +{
590 + unsigned long flags;
591 + u16 w;
592 +
593 + spin_lock_irqsave(&retu_lock, flags);
594 + w = retu_read_reg(reg);
595 + w &= ~clear;
596 + w |= set;
597 + retu_write_reg(reg, w);
598 + spin_unlock_irqrestore(&retu_lock, flags);
599 +}
600 +
601 +#define ADC_MAX_CHAN_NUMBER 13
602 +
603 +int retu_read_adc(int channel)
604 +{
605 + unsigned long flags;
606 + int res;
607 +
608 + if (channel < 0 || channel > ADC_MAX_CHAN_NUMBER)
609 + return -EINVAL;
610 +
611 + spin_lock_irqsave(&retu_lock, flags);
612 +
613 + if ((channel == 8) && retu_is_vilma) {
614 + int scr = retu_read_reg(RETU_REG_ADCSCR);
615 + int ch = (retu_read_reg(RETU_REG_ADCR) >> 10) & 0xf;
616 + if (((scr & 0xff) != 0) && (ch != 8))
617 + retu_write_reg (RETU_REG_ADCSCR, (scr & ~0xff));
618 + }
619 +
620 + /* Select the channel and read result */
621 + retu_write_reg(RETU_REG_ADCR, channel << 10);
622 + res = retu_read_reg(RETU_REG_ADCR) & 0x3ff;
623 +
624 + if (retu_is_vilma)
625 + retu_write_reg(RETU_REG_ADCR, (1 << 13));
626 +
627 + /* Unlock retu */
628 + spin_unlock_irqrestore(&retu_lock, flags);
629 +
630 + return res;
631 +}
632 +
633 +
634 +static u16 retu_disable_bogus_irqs(u16 mask)
635 +{
636 + int i;
637 +
638 + for (i = 0; i < MAX_RETU_IRQ_HANDLERS; i++) {
639 + if (mask & (1 << i))
640 + continue;
641 + if (retu_irq_handlers[i].func != NULL)
642 + continue;
643 + /* an IRQ was enabled but we don't have a handler for it */
644 + printk(KERN_INFO PFX "disabling bogus IRQ %d\n", i);
645 + mask |= (1 << i);
646 + }
647 + return mask;
648 +}
649 +
650 +/*
651 + * Disable given RETU interrupt
652 + */
653 +void retu_disable_irq(int id)
654 +{
655 + unsigned long flags;
656 + u16 mask;
657 +
658 + spin_lock_irqsave(&retu_lock, flags);
659 + mask = retu_read_reg(RETU_REG_IMR);
660 + mask |= 1 << id;
661 + mask = retu_disable_bogus_irqs(mask);
662 + retu_write_reg(RETU_REG_IMR, mask);
663 + spin_unlock_irqrestore(&retu_lock, flags);
664 +}
665 +
666 +/*
667 + * Enable given RETU interrupt
668 + */
669 +void retu_enable_irq(int id)
670 +{
671 + unsigned long flags;
672 + u16 mask;
673 +
674 + if (id == 3) {
675 + printk("Enabling Retu IRQ %d\n", id);
676 + dump_stack();
677 + }
678 + spin_lock_irqsave(&retu_lock, flags);
679 + mask = retu_read_reg(RETU_REG_IMR);
680 + mask &= ~(1 << id);
681 + mask = retu_disable_bogus_irqs(mask);
682 + retu_write_reg(RETU_REG_IMR, mask);
683 + spin_unlock_irqrestore(&retu_lock, flags);
684 +}
685 +
686 +/*
687 + * Acknowledge given RETU interrupt
688 + */
689 +void retu_ack_irq(int id)
690 +{
691 + retu_write_reg(RETU_REG_IDR, 1 << id);
692 +}
693 +
694 +/*
695 + * RETU interrupt handler. Only schedules the tasklet.
696 + */
697 +static irqreturn_t retu_irq_handler(int irq, void *dev_id)
698 +{
699 + tasklet_schedule(&retu_tasklet);
700 + return IRQ_HANDLED;
701 +}
702 +
703 +/*
704 + * Tasklet handler
705 + */
706 +static void retu_tasklet_handler(unsigned long data)
707 +{
708 + struct retu_irq_handler_desc *hnd;
709 + u16 id;
710 + u16 im;
711 + int i;
712 +
713 + for (;;) {
714 + id = retu_read_reg(RETU_REG_IDR);
715 + im = ~retu_read_reg(RETU_REG_IMR);
716 + id &= im;
717 +
718 + if (!id)
719 + break;
720 +
721 + for (i = 0; id != 0; i++, id >>= 1) {
722 + if (!(id & 1))
723 + continue;
724 + hnd = &retu_irq_handlers[i];
725 + if (hnd->func == NULL) {
726 + /* Spurious retu interrupt - disable and ack it */
727 + printk(KERN_INFO "Spurious Retu interrupt "
728 + "(id %d)\n", i);
729 + retu_disable_irq(i);
730 + retu_ack_irq(i);
731 + continue;
732 + }
733 + hnd->func(hnd->arg);
734 + /*
735 + * Don't acknowledge the interrupt here
736 + * It must be done explicitly
737 + */
738 + }
739 + }
740 +}
741 +
742 +/*
743 + * Register the handler for a given RETU interrupt source.
744 + */
745 +int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name)
746 +{
747 + struct retu_irq_handler_desc *hnd;
748 +
749 + if (irq_handler == NULL || id >= MAX_RETU_IRQ_HANDLERS ||
750 + name == NULL) {
751 + printk(KERN_ERR PFX "Invalid arguments to %s\n",
752 + __FUNCTION__);
753 + return -EINVAL;
754 + }
755 + hnd = &retu_irq_handlers[id];
756 + if (hnd->func != NULL) {
757 + printk(KERN_ERR PFX "IRQ %d already reserved\n", id);
758 + return -EBUSY;
759 + }
760 + printk(KERN_INFO PFX "Registering interrupt %d for device %s\n",
761 + id, name);
762 + hnd->func = irq_handler;
763 + hnd->arg = arg;
764 + strlcpy(hnd->name, name, sizeof(hnd->name));
765 +
766 + retu_ack_irq(id);
767 + retu_enable_irq(id);
768 +
769 + return 0;
770 +}
771 +
772 +/*
773 + * Unregister the handler for a given RETU interrupt source.
774 + */
775 +void retu_free_irq(int id)
776 +{
777 + struct retu_irq_handler_desc *hnd;
778 +
779 + if (id >= MAX_RETU_IRQ_HANDLERS) {
780 + printk(KERN_ERR PFX "Invalid argument to %s\n",
781 + __FUNCTION__);
782 + return;
783 + }
784 + hnd = &retu_irq_handlers[id];
785 + if (hnd->func == NULL) {
786 + printk(KERN_ERR PFX "IRQ %d already freed\n", id);
787 + return;
788 + }
789 +
790 + retu_disable_irq(id);
791 + hnd->func = NULL;
792 +}
793 +
794 +/**
795 + * retu_power_off - Shut down power to system
796 + *
797 + * This function puts the system in power off state
798 + */
799 +static void retu_power_off(void)
800 +{
801 + /* Ignore power button state */
802 + retu_write_reg(RETU_REG_CC1, retu_read_reg(RETU_REG_CC1) | 2);
803 + /* Expire watchdog immediately */
804 + retu_write_reg(RETU_REG_WATCHDOG, 0);
805 + /* Wait for poweroff*/
806 + for (;;);
807 +}
808 +
809 +/**
810 + * retu_probe - Probe for Retu ASIC
811 + * @dev: the Retu device
812 + *
813 + * Probe for the Retu ASIC and allocate memory
814 + * for its device-struct if found
815 + */
816 +static int __devinit retu_probe(struct device *dev)
817 +{
818 + int rev, ret;
819 +
820 + /* Prepare tasklet */
821 + tasklet_init(&retu_tasklet, retu_tasklet_handler, 0);
822 +
823 + /* REVISIT: Pass these from board-*.c files in platform_data */
824 + if (machine_is_nokia770()) {
825 + retu_irq_pin = 62;
826 + } else if (machine_is_nokia_n800() || machine_is_nokia_n810() ||
827 + machine_is_nokia_n810_wimax()) {
828 + retu_irq_pin = 108;
829 + } else {
830 + printk(KERN_ERR "cbus: Unsupported board for tahvo\n");
831 + return -ENODEV;
832 + }
833 +
834 + if ((ret = gpio_request(retu_irq_pin, "RETU irq")) < 0) {
835 + printk(KERN_ERR PFX "Unable to reserve IRQ GPIO\n");
836 + return ret;
837 + }
838 +
839 + /* Set the pin as input */
840 + gpio_direction_input(retu_irq_pin);
841 +
842 + /* Rising edge triggers the IRQ */
843 + set_irq_type(gpio_to_irq(retu_irq_pin), IRQ_TYPE_EDGE_RISING);
844 +
845 + retu_initialized = 1;
846 +
847 + rev = retu_read_reg(RETU_REG_ASICR) & 0xff;
848 + if (rev & (1 << 7))
849 + retu_is_vilma = 1;
850 +
851 + printk(KERN_INFO "%s v%d.%d found\n", retu_is_vilma ? "Vilma" : "Retu",
852 + (rev >> 4) & 0x07, rev & 0x0f);
853 +
854 + /* Mask all RETU interrupts */
855 + retu_write_reg(RETU_REG_IMR, 0xffff);
856 +
857 + ret = request_irq(gpio_to_irq(retu_irq_pin), retu_irq_handler, 0,
858 + "retu", 0);
859 + if (ret < 0) {
860 + printk(KERN_ERR PFX "Unable to register IRQ handler\n");
861 + gpio_free(retu_irq_pin);
862 + return ret;
863 + }
864 + set_irq_wake(gpio_to_irq(retu_irq_pin), 1);
865 +
866 + /* Register power off function */
867 + pm_power_off = retu_power_off;
868 +
869 +#ifdef CONFIG_CBUS_RETU_USER
870 + /* Initialize user-space interface */
871 + if (retu_user_init() < 0) {
872 + printk(KERN_ERR "Unable to initialize driver\n");
873 + free_irq(gpio_to_irq(retu_irq_pin), 0);
874 + gpio_free(retu_irq_pin);
875 + return ret;
876 + }
877 +#endif
878 +
879 + return 0;
880 +}
881 +
882 +static int retu_remove(struct device *dev)
883 +{
884 +#ifdef CONFIG_CBUS_RETU_USER
885 + retu_user_cleanup();
886 +#endif
887 + /* Mask all RETU interrupts */
888 + retu_write_reg(RETU_REG_IMR, 0xffff);
889 + free_irq(gpio_to_irq(retu_irq_pin), 0);
890 + gpio_free(retu_irq_pin);
891 + tasklet_kill(&retu_tasklet);
892 +
893 + return 0;
894 +}
895 +
896 +static void retu_device_release(struct device *dev)
897 +{
898 + complete(&device_release);
899 +}
900 +
901 +static struct device_driver retu_driver = {
902 + .name = "retu",
903 + .bus = &platform_bus_type,
904 + .probe = retu_probe,
905 + .remove = retu_remove,
906 +};
907 +
908 +static struct platform_device retu_device = {
909 + .name = "retu",
910 + .id = -1,
911 + .dev = {
912 + .release = retu_device_release,
913 + }
914 +};
915 +
916 +/**
917 + * retu_init - initialise Retu driver
918 + *
919 + * Initialise the Retu driver and return 0 if everything worked ok
920 + */
921 +static int __init retu_init(void)
922 +{
923 + int ret = 0;
924 +
925 + printk(KERN_INFO "Retu/Vilma driver initialising\n");
926 +
927 + init_completion(&device_release);
928 +
929 + if ((ret = driver_register(&retu_driver)) < 0)
930 + return ret;
931 +
932 + if ((ret = platform_device_register(&retu_device)) < 0) {
933 + driver_unregister(&retu_driver);
934 + return ret;
935 + }
936 + return 0;
937 +}
938 +
939 +/*
940 + * Cleanup
941 + */
942 +static void __exit retu_exit(void)
943 +{
944 + platform_device_unregister(&retu_device);
945 + driver_unregister(&retu_driver);
946 + wait_for_completion(&device_release);
947 +}
948 +
949 +EXPORT_SYMBOL(retu_request_irq);
950 +EXPORT_SYMBOL(retu_free_irq);
951 +EXPORT_SYMBOL(retu_enable_irq);
952 +EXPORT_SYMBOL(retu_disable_irq);
953 +EXPORT_SYMBOL(retu_ack_irq);
954 +EXPORT_SYMBOL(retu_read_reg);
955 +EXPORT_SYMBOL(retu_write_reg);
956 +
957 +subsys_initcall(retu_init);
958 +module_exit(retu_exit);
959 +
960 +MODULE_DESCRIPTION("Retu ASIC control");
961 +MODULE_LICENSE("GPL");
962 +MODULE_AUTHOR("Juha Yrjölä, David Weinehall, and Mikko Ylinen");
963 Index: linux-2.6.37/drivers/cbus/retu.h
964 ===================================================================
965 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
966 +++ linux-2.6.37/drivers/cbus/retu.h 2011-01-27 14:17:39.085000008 +0100
967 @@ -0,0 +1,77 @@
968 +/**
969 + * drivers/cbus/retu.h
970 + *
971 + * Copyright (C) 2004, 2005 Nokia Corporation
972 + *
973 + * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
974 + * David Weinehall <david.weinehall@nokia.com>
975 + *
976 + * This file is subject to the terms and conditions of the GNU General
977 + * Public License. See the file "COPYING" in the main directory of this
978 + * archive for more details.
979 + *
980 + * This program is distributed in the hope that it will be useful,
981 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
982 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
983 + * GNU General Public License for more details.
984 +
985 + * You should have received a copy of the GNU General Public License
986 + * along with this program; if not, write to the Free Software
987 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
988 + */
989 +
990 +#ifndef __DRIVERS_CBUS_RETU_H
991 +#define __DRIVERS_CBUS_RETU_H
992 +
993 +#include <linux/types.h>
994 +
995 +/* Registers */
996 +#define RETU_REG_ASICR 0x00 /* ASIC ID & revision */
997 +#define RETU_REG_IDR 0x01 /* Interrupt ID */
998 +#define RETU_REG_IMR 0x02 /* Interrupt mask */
999 +#define RETU_REG_RTCDSR 0x03 /* RTC seconds register */
1000 +#define RETU_REG_RTCHMR 0x04 /* RTC hours and minutes register */
1001 +#define RETU_REG_RTCHMAR 0x05 /* RTC hours and minutes alarm and time set register */
1002 +#define RETU_REG_RTCCALR 0x06 /* RTC calibration register */
1003 +#define RETU_REG_ADCR 0x08 /* ADC result */
1004 +#define RETU_REG_ADCSCR 0x09 /* ADC sample ctrl */
1005 +#define RETU_REG_CC1 0x0d /* Common control register 1 */
1006 +#define RETU_REG_CC2 0x0e /* Common control register 2 */
1007 +#define RETU_REG_CTRL_CLR 0x0f /* Regulator clear register */
1008 +#define RETU_REG_CTRL_SET 0x10 /* Regulator set register */
1009 +#define RETU_REG_STATUS 0x16 /* Status register */
1010 +#define RETU_REG_WATCHDOG 0x17 /* Watchdog register */
1011 +#define RETU_REG_AUDTXR 0x18 /* Audio Codec Tx register */
1012 +#define RETU_REG_MAX 0x1f
1013 +
1014 +/* Interrupt sources */
1015 +#define RETU_INT_PWR 0
1016 +#define RETU_INT_CHAR 1
1017 +#define RETU_INT_RTCS 2
1018 +#define RETU_INT_RTCM 3
1019 +#define RETU_INT_RTCD 4
1020 +#define RETU_INT_RTCA 5
1021 +#define RETU_INT_HOOK 6
1022 +#define RETU_INT_HEAD 7
1023 +#define RETU_INT_ADCS 8
1024 +
1025 +#define MAX_RETU_IRQ_HANDLERS 16
1026 +
1027 +int retu_read_reg(int reg);
1028 +void retu_write_reg(int reg, u16 val);
1029 +void retu_set_clear_reg_bits(int reg, u16 set, u16 clear);
1030 +int retu_read_adc(int channel);
1031 +int retu_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
1032 +void retu_free_irq(int id);
1033 +void retu_enable_irq(int id);
1034 +void retu_disable_irq(int id);
1035 +void retu_ack_irq(int id);
1036 +
1037 +#ifdef CONFIG_CBUS_RETU_USER
1038 +int retu_user_init(void);
1039 +void retu_user_cleanup(void);
1040 +#endif
1041 +
1042 +extern spinlock_t retu_lock;
1043 +
1044 +#endif /* __DRIVERS_CBUS_RETU_H */
1045 Index: linux-2.6.37/drivers/cbus/retu-headset.c
1046 ===================================================================
1047 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
1048 +++ linux-2.6.37/drivers/cbus/retu-headset.c 2011-01-27 14:17:39.085000008 +0100
1049 @@ -0,0 +1,356 @@
1050 +/**
1051 + * Retu/Vilma headset detection
1052 + *
1053 + * Copyright (C) 2006 Nokia Corporation
1054 + *
1055 + * Written by Juha Yrjölä
1056 + *
1057 + * This file is subject to the terms and conditions of the GNU General
1058 + * Public License. See the file "COPYING" in the main directory of this
1059 + * archive for more details.
1060 + *
1061 + * This program is distributed in the hope that it will be useful,
1062 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1063 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1064 + * GNU General Public License for more details.
1065 + *
1066 + * You should have received a copy of the GNU General Public License
1067 + * along with this program; if not, write to the Free Software
1068 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1069 + */
1070 +
1071 +#include <linux/module.h>
1072 +#include <linux/init.h>
1073 +#include <linux/kernel.h>
1074 +#include <linux/delay.h>
1075 +#include <linux/input.h>
1076 +#include <linux/platform_device.h>
1077 +#include <linux/slab.h>
1078 +
1079 +#include "retu.h"
1080 +
1081 +#define RETU_ADC_CHANNEL_HOOKDET 0x05
1082 +
1083 +#define RETU_HEADSET_KEY KEY_PHONE
1084 +
1085 +struct retu_headset {
1086 + spinlock_t lock;
1087 + struct mutex mutex;
1088 + struct platform_device *pdev;
1089 + struct input_dev *idev;
1090 + unsigned bias_enabled;
1091 + unsigned detection_enabled;
1092 + unsigned pressed;
1093 + struct timer_list enable_timer;
1094 + struct timer_list detect_timer;
1095 +};
1096 +
1097 +static void retu_headset_set_bias(int enable)
1098 +{
1099 + if (enable) {
1100 + retu_set_clear_reg_bits(RETU_REG_AUDTXR,
1101 + (1 << 0) | (1 << 1), 0);
1102 + msleep(2);
1103 + retu_set_clear_reg_bits(RETU_REG_AUDTXR, 1 << 3, 0);
1104 + } else {
1105 + retu_set_clear_reg_bits(RETU_REG_AUDTXR, 0,
1106 + (1 << 0) | (1 << 1) | (1 << 3));
1107 + }
1108 +}
1109 +
1110 +static void retu_headset_enable(struct retu_headset *hs)
1111 +{
1112 + mutex_lock(&hs->mutex);
1113 + if (!hs->bias_enabled) {
1114 + hs->bias_enabled = 1;
1115 + retu_headset_set_bias(1);
1116 + }
1117 + mutex_unlock(&hs->mutex);
1118 +}
1119 +
1120 +static void retu_headset_disable(struct retu_headset *hs)
1121 +{
1122 + mutex_lock(&hs->mutex);
1123 + if (hs->bias_enabled) {
1124 + hs->bias_enabled = 0;
1125 + retu_headset_set_bias(0);
1126 + }
1127 + mutex_unlock(&hs->mutex);
1128 +}
1129 +
1130 +static void retu_headset_det_enable(struct retu_headset *hs)
1131 +{
1132 + mutex_lock(&hs->mutex);
1133 + if (!hs->detection_enabled) {
1134 + hs->detection_enabled = 1;
1135 + retu_set_clear_reg_bits(RETU_REG_CC1, (1 << 10) | (1 << 8), 0);
1136 + retu_enable_irq(RETU_INT_HOOK);
1137 + }
1138 + mutex_unlock(&hs->mutex);
1139 +}
1140 +
1141 +static void retu_headset_det_disable(struct retu_headset *hs)
1142 +{
1143 + unsigned long flags;
1144 +
1145 + mutex_lock(&hs->mutex);
1146 + if (hs->detection_enabled) {
1147 + hs->detection_enabled = 0;
1148 + retu_disable_irq(RETU_INT_HOOK);
1149 + del_timer_sync(&hs->enable_timer);
1150 + del_timer_sync(&hs->detect_timer);
1151 + spin_lock_irqsave(&hs->lock, flags);
1152 + if (hs->pressed)
1153 + input_report_key(hs->idev, RETU_HEADSET_KEY, 0);
1154 + spin_unlock_irqrestore(&hs->lock, flags);
1155 + retu_set_clear_reg_bits(RETU_REG_CC1, 0, (1 << 10) | (1 << 8));
1156 + }
1157 + mutex_unlock(&hs->mutex);
1158 +}
1159 +
1160 +static ssize_t retu_headset_hookdet_show(struct device *dev,
1161 + struct device_attribute *attr,
1162 + char *buf)
1163 +{
1164 + int val;
1165 +
1166 + val = retu_read_adc(RETU_ADC_CHANNEL_HOOKDET);
1167 + return sprintf(buf, "%d\n", val);
1168 +}
1169 +
1170 +static DEVICE_ATTR(hookdet, S_IRUGO, retu_headset_hookdet_show, NULL);
1171 +
1172 +static ssize_t retu_headset_enable_show(struct device *dev,
1173 + struct device_attribute *attr,
1174 + char *buf)
1175 +{
1176 + struct retu_headset *hs = dev_get_drvdata(dev);
1177 +
1178 + return sprintf(buf, "%u\n", hs->bias_enabled);
1179 +}
1180 +
1181 +static ssize_t retu_headset_enable_store(struct device *dev,
1182 + struct device_attribute *attr,
1183 + const char *buf, size_t count)
1184 +{
1185 + struct retu_headset *hs = dev_get_drvdata(dev);
1186 + int enable;
1187 +
1188 + if (sscanf(buf, "%u", &enable) != 1)
1189 + return -EINVAL;
1190 + if (enable)
1191 + retu_headset_enable(hs);
1192 + else
1193 + retu_headset_disable(hs);
1194 + return count;
1195 +}
1196 +
1197 +static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR | S_IWGRP,
1198 + retu_headset_enable_show, retu_headset_enable_store);
1199 +
1200 +static ssize_t retu_headset_enable_det_show(struct device *dev,
1201 + struct device_attribute *attr,
1202 + char *buf)
1203 +{
1204 + struct retu_headset *hs = dev_get_drvdata(dev);
1205 +
1206 + return sprintf(buf, "%u\n", hs->detection_enabled);
1207 +}
1208 +
1209 +static ssize_t retu_headset_enable_det_store(struct device *dev,
1210 + struct device_attribute *attr,
1211 + const char *buf, size_t count)
1212 +{
1213 + struct retu_headset *hs = dev_get_drvdata(dev);
1214 + int enable;
1215 +
1216 + if (sscanf(buf, "%u", &enable) != 1)
1217 + return -EINVAL;
1218 + if (enable)
1219 + retu_headset_det_enable(hs);
1220 + else
1221 + retu_headset_det_disable(hs);
1222 + return count;
1223 +}
1224 +
1225 +static DEVICE_ATTR(enable_det, S_IRUGO | S_IWUSR | S_IWGRP,
1226 + retu_headset_enable_det_show,
1227 + retu_headset_enable_det_store);
1228 +
1229 +static void retu_headset_hook_interrupt(unsigned long arg)
1230 +{
1231 + struct retu_headset *hs = (struct retu_headset *) arg;
1232 + unsigned long flags;
1233 +
1234 + retu_ack_irq(RETU_INT_HOOK);
1235 + spin_lock_irqsave(&hs->lock, flags);
1236 + if (!hs->pressed) {
1237 + /* Headset button was just pressed down. */
1238 + hs->pressed = 1;
1239 + input_report_key(hs->idev, RETU_HEADSET_KEY, 1);
1240 + }
1241 + spin_unlock_irqrestore(&hs->lock, flags);
1242 + retu_set_clear_reg_bits(RETU_REG_CC1, 0, (1 << 10) | (1 << 8));
1243 + mod_timer(&hs->enable_timer, jiffies + msecs_to_jiffies(50));
1244 +}
1245 +
1246 +static void retu_headset_enable_timer(unsigned long arg)
1247 +{
1248 + struct retu_headset *hs = (struct retu_headset *) arg;
1249 +
1250 + retu_set_clear_reg_bits(RETU_REG_CC1, (1 << 10) | (1 << 8), 0);
1251 + mod_timer(&hs->detect_timer, jiffies + msecs_to_jiffies(350));
1252 +}
1253 +
1254 +static void retu_headset_detect_timer(unsigned long arg)
1255 +{
1256 + struct retu_headset *hs = (struct retu_headset *) arg;
1257 + unsigned long flags;
1258 +
1259 + spin_lock_irqsave(&hs->lock, flags);
1260 + if (hs->pressed) {
1261 + hs->pressed = 0;
1262 + input_report_key(hs->idev, RETU_HEADSET_KEY, 0);
1263 + }
1264 + spin_unlock_irqrestore(&hs->lock, flags);
1265 +}
1266 +
1267 +static int __init retu_headset_probe(struct platform_device *pdev)
1268 +{
1269 + struct retu_headset *hs;
1270 + int r;
1271 +
1272 + hs = kzalloc(sizeof(*hs), GFP_KERNEL);
1273 + if (hs == NULL)
1274 + return -ENOMEM;
1275 +
1276 + hs->pdev = pdev;
1277 +
1278 + hs->idev = input_allocate_device();
1279 + if (hs->idev == NULL) {
1280 + r = -ENOMEM;
1281 + goto err1;
1282 + }
1283 + hs->idev->name = "retu-headset";
1284 + hs->idev->dev.parent = &pdev->dev;
1285 + set_bit(EV_KEY, hs->idev->evbit);
1286 + set_bit(RETU_HEADSET_KEY, hs->idev->keybit);
1287 + r = input_register_device(hs->idev);
1288 + if (r < 0)
1289 + goto err2;
1290 +
1291 + r = device_create_file(&pdev->dev, &dev_attr_hookdet);
1292 + if (r < 0)
1293 + goto err3;
1294 + r = device_create_file(&pdev->dev, &dev_attr_enable);
1295 + if (r < 0)
1296 + goto err4;
1297 + r = device_create_file(&pdev->dev, &dev_attr_enable_det);
1298 + if (r < 0)
1299 + goto err5;
1300 + platform_set_drvdata(pdev, hs);
1301 +
1302 + spin_lock_init(&hs->lock);
1303 + mutex_init(&hs->mutex);
1304 + setup_timer(&hs->enable_timer, retu_headset_enable_timer,
1305 + (unsigned long) hs);
1306 + setup_timer(&hs->detect_timer, retu_headset_detect_timer,
1307 + (unsigned long) hs);
1308 +
1309 + r = retu_request_irq(RETU_INT_HOOK, retu_headset_hook_interrupt,
1310 + (unsigned long) hs, "hookdet");
1311 + if (r != 0) {
1312 + dev_err(&pdev->dev, "hookdet IRQ not available\n");
1313 + goto err6;
1314 + }
1315 + retu_disable_irq(RETU_INT_HOOK);
1316 + return 0;
1317 +err6:
1318 + device_remove_file(&pdev->dev, &dev_attr_enable_det);
1319 +err5:
1320 + device_remove_file(&pdev->dev, &dev_attr_enable);
1321 +err4:
1322 + device_remove_file(&pdev->dev, &dev_attr_hookdet);
1323 +err3:
1324 + input_unregister_device(hs->idev);
1325 +err2:
1326 + input_free_device(hs->idev);
1327 +err1:
1328 + kfree(hs);
1329 + return r;
1330 +}
1331 +
1332 +static int retu_headset_remove(struct platform_device *pdev)
1333 +{
1334 + struct retu_headset *hs = platform_get_drvdata(pdev);
1335 +
1336 + device_remove_file(&pdev->dev, &dev_attr_hookdet);
1337 + device_remove_file(&pdev->dev, &dev_attr_enable);
1338 + device_remove_file(&pdev->dev, &dev_attr_enable_det);
1339 + retu_headset_disable(hs);
1340 + retu_headset_det_disable(hs);
1341 + retu_free_irq(RETU_INT_HOOK);
1342 + input_unregister_device(hs->idev);
1343 + input_free_device(hs->idev);
1344 + return 0;
1345 +}
1346 +
1347 +static int retu_headset_suspend(struct platform_device *pdev,
1348 + pm_message_t mesg)
1349 +{
1350 + struct retu_headset *hs = platform_get_drvdata(pdev);
1351 +
1352 + mutex_lock(&hs->mutex);
1353 + if (hs->bias_enabled)
1354 + retu_headset_set_bias(0);
1355 + mutex_unlock(&hs->mutex);
1356 +
1357 + return 0;
1358 +}
1359 +
1360 +static int retu_headset_resume(struct platform_device *pdev)
1361 +{
1362 + struct retu_headset *hs = platform_get_drvdata(pdev);
1363 +
1364 + mutex_lock(&hs->mutex);
1365 + if (hs->bias_enabled)
1366 + retu_headset_set_bias(1);
1367 + mutex_unlock(&hs->mutex);
1368 +
1369 + return 0;
1370 +}
1371 +
1372 +static struct platform_driver retu_headset_driver = {
1373 + .probe = retu_headset_probe,
1374 + .remove = retu_headset_remove,
1375 + .suspend = retu_headset_suspend,
1376 + .resume = retu_headset_resume,
1377 + .driver = {
1378 + .name = "retu-headset",
1379 + },
1380 +};
1381 +
1382 +static int __init retu_headset_init(void)
1383 +{
1384 + int r;
1385 +
1386 + printk(KERN_INFO "Retu/Vilma headset driver initializing\n");
1387 +
1388 + r = platform_driver_register(&retu_headset_driver);
1389 + if (r < 0)
1390 + return r;
1391 +
1392 + return 0;
1393 +}
1394 +
1395 +static void __exit retu_headset_exit(void)
1396 +{
1397 + platform_driver_unregister(&retu_headset_driver);
1398 +}
1399 +
1400 +module_init(retu_headset_init);
1401 +module_exit(retu_headset_exit);
1402 +
1403 +MODULE_DESCRIPTION("Retu/Vilma headset detection");
1404 +MODULE_LICENSE("GPL");
1405 +MODULE_AUTHOR("Juha Yrjölä");
1406 Index: linux-2.6.37/drivers/cbus/retu-pwrbutton.c
1407 ===================================================================
1408 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
1409 +++ linux-2.6.37/drivers/cbus/retu-pwrbutton.c 2011-01-27 14:17:39.085000008 +0100
1410 @@ -0,0 +1,118 @@
1411 +/**
1412 + * drivers/cbus/retu-pwrbutton.c
1413 + *
1414 + * Driver for sending retu power button event to input-layer
1415 + *
1416 + * Copyright (C) 2004 Nokia Corporation
1417 + *
1418 + * Written by Ari Saastamoinen <ari.saastamoinen@elektrobit.com>
1419 + *
1420 + * Contact Juha Yrjölä <juha.yrjola@nokia.com>
1421 + *
1422 + * This file is subject to the terms and conditions of the GNU General
1423 + * Public License. See the file "COPYING" in the main directory of this
1424 + * archive for more details.
1425 + *
1426 + * This program is distributed in the hope that it will be useful,
1427 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1428 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1429 + * GNU General Public License for more details.
1430 + *
1431 + * You should have received a copy of the GNU General Public License
1432 + * along with this program; if not, write to the Free Software
1433 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1434 + */
1435 +
1436 +#include <linux/module.h>
1437 +#include <linux/init.h>
1438 +#include <linux/kernel.h>
1439 +#include <linux/errno.h>
1440 +#include <linux/input.h>
1441 +#include <linux/timer.h>
1442 +#include <linux/jiffies.h>
1443 +#include <linux/bitops.h>
1444 +
1445 +#include "retu.h"
1446 +
1447 +#define RETU_STATUS_PWRONX (1 << 5)
1448 +
1449 +#define PWRBTN_DELAY 20
1450 +#define PWRBTN_UP 0
1451 +#define PWRBTN_PRESSED 1
1452 +
1453 +static int pwrbtn_state;
1454 +static struct input_dev *pwrbtn_dev;
1455 +static struct timer_list pwrbtn_timer;
1456 +
1457 +static void retubutton_timer_func(unsigned long arg)
1458 +{
1459 + int state;
1460 +
1461 + if (retu_read_reg(RETU_REG_STATUS) & RETU_STATUS_PWRONX)
1462 + state = PWRBTN_UP;
1463 + else
1464 + state = PWRBTN_PRESSED;
1465 +
1466 + if (pwrbtn_state != state) {
1467 + input_report_key(pwrbtn_dev, KEY_POWER, state);
1468 + pwrbtn_state = state;
1469 + }
1470 +}
1471 +
1472 +/**
1473 + * Interrupt function is called whenever power button key is pressed
1474 + * or released.
1475 + */
1476 +static void retubutton_irq(unsigned long arg)
1477 +{
1478 + retu_ack_irq(RETU_INT_PWR);
1479 + mod_timer(&pwrbtn_timer, jiffies + msecs_to_jiffies(PWRBTN_DELAY));
1480 +}
1481 +
1482 +/**
1483 + * Init function.
1484 + * Allocates interrupt for power button and registers itself to input layer.
1485 + */
1486 +static int __init retubutton_init(void)
1487 +{
1488 + int irq;
1489 +
1490 + printk(KERN_INFO "Retu power button driver initialized\n");
1491 + irq = RETU_INT_PWR;
1492 +
1493 + init_timer(&pwrbtn_timer);
1494 + pwrbtn_timer.function = retubutton_timer_func;
1495 +
1496 + if (retu_request_irq(irq, &retubutton_irq, 0, "PwrOnX") < 0) {
1497 + printk(KERN_ERR "%s@%s: Cannot allocate irq\n",
1498 + __FUNCTION__, __FILE__);
1499 + return -EBUSY;
1500 + }
1501 +
1502 + pwrbtn_dev = input_allocate_device();
1503 + if (!pwrbtn_dev)
1504 + return -ENOMEM;
1505 +
1506 + pwrbtn_dev->evbit[0] = BIT_MASK(EV_KEY);
1507 + pwrbtn_dev->keybit[BIT_WORD(KEY_POWER)] = BIT_MASK(KEY_POWER);
1508 + pwrbtn_dev->name = "retu-pwrbutton";
1509 +
1510 + return input_register_device(pwrbtn_dev);
1511 +}
1512 +
1513 +/**
1514 + * Cleanup function which is called when driver is unloaded
1515 + */
1516 +static void __exit retubutton_exit(void)
1517 +{
1518 + retu_free_irq(RETU_INT_PWR);
1519 + del_timer_sync(&pwrbtn_timer);
1520 + input_unregister_device(pwrbtn_dev);
1521 +}
1522 +
1523 +module_init(retubutton_init);
1524 +module_exit(retubutton_exit);
1525 +
1526 +MODULE_DESCRIPTION("Retu Power Button");
1527 +MODULE_LICENSE("GPL");
1528 +MODULE_AUTHOR("Ari Saastamoinen");
1529 Index: linux-2.6.37/drivers/cbus/retu-rtc.c
1530 ===================================================================
1531 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
1532 +++ linux-2.6.37/drivers/cbus/retu-rtc.c 2011-01-27 14:17:39.086000008 +0100
1533 @@ -0,0 +1,477 @@
1534 +/**
1535 + * drivers/cbus/retu-rtc.c
1536 + *
1537 + * Support for Retu RTC
1538 + *
1539 + * Copyright (C) 2004, 2005 Nokia Corporation
1540 + *
1541 + * Written by Paul Mundt <paul.mundt@nokia.com> and
1542 + * Igor Stoppa <igor.stoppa@nokia.com>
1543 + *
1544 + * The Retu RTC is essentially a partial read-only RTC that gives us Retu's
1545 + * idea of what time actually is. It's left as a userspace excercise to map
1546 + * this back to time in the real world and ensure that calibration settings
1547 + * are sane to compensate for any horrible drift (on account of not being able
1548 + * to set the clock to anything).
1549 + *
1550 + * Days are semi-writeable. Namely, Retu will only track 255 days for us
1551 + * consecutively, after which the counter is explicitly stuck at 255 until
1552 + * someone comes along and clears it with a write. In the event that no one
1553 + * comes along and clears it, we no longer have any idea what day it is.
1554 + *
1555 + * This file is subject to the terms and conditions of the GNU General
1556 + * Public License. See the file "COPYING" in the main directory of this
1557 + * archive for more details.
1558 + *
1559 + * This program is distributed in the hope that it will be useful,
1560 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1561 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1562 + * GNU General Public License for more details.
1563 + *
1564 + * You should have received a copy of the GNU General Public License
1565 + * along with this program; if not, write to the Free Software
1566 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
1567 + */
1568 +
1569 +#include <linux/device.h>
1570 +#include <linux/init.h>
1571 +#include <linux/kernel.h>
1572 +#include <linux/module.h>
1573 +#include <linux/completion.h>
1574 +#include <linux/platform_device.h>
1575 +#include <linux/mutex.h>
1576 +#include <linux/workqueue.h>
1577 +
1578 +#include "cbus.h"
1579 +#include "retu.h"
1580 +
1581 +static struct mutex retu_rtc_mutex;
1582 +static u16 retu_rtc_alarm_expired;
1583 +static u16 retu_rtc_reset_occurred;
1584 +
1585 +static DECLARE_COMPLETION(retu_rtc_exited);
1586 +static DECLARE_COMPLETION(retu_rtc_sync);
1587 +
1588 +static void retu_rtc_barrier(void);
1589 +
1590 +static void retu_rtc_device_release(struct device *dev)
1591 +{
1592 + complete(&retu_rtc_exited);
1593 +}
1594 +
1595 +static ssize_t retu_rtc_time_show(struct device *dev, struct device_attribute *attr,
1596 + char *buf)
1597 +{
1598 + u16 dsr, hmr, dsr2;
1599 +
1600 + mutex_lock(&retu_rtc_mutex);
1601 +
1602 + do {
1603 + u16 dummy;
1604 +
1605 + /*
1606 + * Not being in_interrupt() for a retu rtc IRQ, we need to
1607 + * read twice for consistency..
1608 + */
1609 + dummy = retu_read_reg(RETU_REG_RTCDSR);
1610 + dsr = retu_read_reg(RETU_REG_RTCDSR);
1611 +
1612 + dummy = retu_read_reg(RETU_REG_RTCHMR);
1613 + hmr = retu_read_reg(RETU_REG_RTCHMR);
1614 +
1615 + dummy = retu_read_reg(RETU_REG_RTCDSR);
1616 + dsr2 = retu_read_reg(RETU_REG_RTCDSR);
1617 + } while ((dsr != dsr2));
1618 +
1619 + mutex_unlock(&retu_rtc_mutex);
1620 +
1621 + /*
1622 + * Format a 32-bit date-string for userspace
1623 + *
1624 + * days | hours | minutes | seconds
1625 + *
1626 + * 8 bits for each.
1627 + *
1628 + * This mostly sucks because days and seconds are tracked in RTCDSR
1629 + * while hours and minutes are tracked in RTCHMR. And yes, there
1630 + * really are no words that can describe an 8 bit day register (or
1631 + * rather, none that will be reprinted here).
1632 + */
1633 + return sprintf(buf, "0x%08x\n", (((dsr >> 8) & 0xff) << 24) |
1634 + (((hmr >> 8) & 0x1f) << 16) |
1635 + ((hmr & 0x3f) << 8) | (dsr & 0x3f));
1636 +}
1637 +
1638 +static ssize_t retu_rtc_time_store(struct device *dev, struct device_attribute *attr,
1639 + const char *buf, size_t count)
1640 +{
1641 + mutex_lock(&retu_rtc_mutex);
1642 + /*
1643 + * Writing anything to the day counter forces it to 0
1644 + * The seconds counter would be cleared by resetting the minutes counter,
1645 + * however this won't happen, since we are using the hh:mm counters as
1646 + * a set of free running counters and the day counter as a multiple
1647 + * overflow holder.
1648 + */
1649 +
1650 + /* Reset day counter, but keep Temperature Shutdown state */
1651 + retu_write_reg(RETU_REG_RTCDSR,
1652 + retu_read_reg(RETU_REG_RTCDSR) & (1 << 6));
1653 +
1654 + mutex_unlock(&retu_rtc_mutex);
1655 +
1656 + return count;
1657 +}
1658 +
1659 +static DEVICE_ATTR(time, S_IRUGO | S_IWUSR, retu_rtc_time_show,
1660 + retu_rtc_time_store);
1661 +
1662 +
1663 +static ssize_t retu_rtc_reset_show(struct device *dev, struct device_attribute *attr, char *buf)
1664 +{
1665 + /*
1666 + * Returns the status of the rtc
1667 + *
1668 + * 0: no reset has occurred or the status has been cleared
1669 + * 1: a reset has occurred
1670 + *
1671 + * RTC needs to be reset only when both main battery
1672 + * _AND_ backup battery are discharged
1673 + */
1674 + return sprintf(buf, "%u\n", retu_rtc_reset_occurred);
1675 +}
1676 +
1677 +static void retu_rtc_do_reset(void)
1678 +{
1679 + u16 ccr1;
1680 +
1681 + ccr1 = retu_read_reg(RETU_REG_CC1);
1682 + /* RTC in reset */
1683 + retu_write_reg(RETU_REG_CC1, ccr1 | 0x0001);
1684 + /* RTC in normal operating mode */
1685 + retu_write_reg(RETU_REG_CC1, ccr1 & ~0x0001);
1686 +
1687 + retu_rtc_barrier();
1688 + /* Disable alarm and RTC WD */
1689 + retu_write_reg(RETU_REG_RTCHMAR, 0x7f3f);
1690 + /* Set Calibration register to default value */
1691 + retu_write_reg(RETU_REG_RTCCALR, 0x00c0);
1692 +
1693 + retu_rtc_alarm_expired = 0;
1694 + retu_rtc_reset_occurred = 1;
1695 +}
1696 +
1697 +static ssize_t retu_rtc_reset_store(struct device *dev, struct device_attribute *attr,
1698 + const char *buf, size_t count)
1699 +{
1700 + unsigned choice;
1701 +
1702 + if(sscanf(buf, "%u", &choice) != 1)
1703 + return count;
1704 + mutex_lock(&retu_rtc_mutex);
1705 + if (choice == 0)
1706 + retu_rtc_reset_occurred = 0;
1707 + else if (choice == 1)
1708 + retu_rtc_do_reset();
1709 + mutex_unlock(&retu_rtc_mutex);
1710 + return count;
1711 +}
1712 +
1713 +static DEVICE_ATTR(reset, S_IRUGO | S_IWUSR, retu_rtc_reset_show,
1714 + retu_rtc_reset_store);
1715 +
1716 +static ssize_t retu_rtc_alarm_show(struct device *dev, struct device_attribute *attr,
1717 + char *buf)
1718 +{
1719 + u16 chmar;
1720 + ssize_t retval;
1721 +
1722 + mutex_lock(&retu_rtc_mutex);
1723 + /*
1724 + * Format a 16-bit date-string for userspace
1725 + *
1726 + * hours | minutes
1727 + * 8 bits for each.
1728 + */
1729 + chmar = retu_read_reg(RETU_REG_RTCHMAR);
1730 + /* No shifting needed, only masking unrelated bits */
1731 + retval = sprintf(buf, "0x%04x\n", chmar & 0x1f3f);
1732 + mutex_unlock(&retu_rtc_mutex);
1733 +
1734 + return retval;
1735 +}
1736 +
1737 +static ssize_t retu_rtc_alarm_store(struct device *dev, struct device_attribute *attr,
1738 + const char *buf, size_t count)
1739 +{
1740 + u16 chmar;
1741 + unsigned alrm;
1742 + unsigned hours;
1743 + unsigned minutes;
1744 +
1745 + mutex_lock(&retu_rtc_mutex);
1746 +
1747 + if(sscanf(buf, "%x", &alrm) != 1)
1748 + return count;
1749 + hours = (alrm >> 8) & 0x001f;
1750 + minutes = (alrm >> 0) & 0x003f;
1751 + if ((hours < 24 && minutes < 60) || (hours == 24 && minutes == 60)) {
1752 + /*
1753 + * OK, the time format for the alarm is valid (including the
1754 + * disabling values)
1755 + */
1756 + /* Keeps the RTC watchdog status */
1757 + chmar = retu_read_reg(RETU_REG_RTCHMAR) & 0x6000;
1758 + chmar |= alrm & 0x1f3f; /* Stores the requested alarm */
1759 + retu_rtc_barrier();
1760 + retu_write_reg(RETU_REG_RTCHMAR, chmar);
1761 + /* If the alarm is being disabled */
1762 + if (hours == 24 && minutes == 60) {
1763 + /* disable the interrupt */
1764 + retu_disable_irq(RETU_INT_RTCA);
1765 + retu_rtc_alarm_expired = 0;
1766 + } else
1767 + /* enable the interrupt */
1768 + retu_enable_irq(RETU_INT_RTCA);
1769 + }
1770 + mutex_unlock(&retu_rtc_mutex);
1771 +
1772 + return count;
1773 +}
1774 +
1775 +static DEVICE_ATTR(alarm, S_IRUGO | S_IWUSR, retu_rtc_alarm_show,
1776 + retu_rtc_alarm_store);
1777 +
1778 +static ssize_t retu_rtc_alarm_expired_show(struct device *dev, struct device_attribute *attr,
1779 + char *buf)
1780 +{
1781 + ssize_t retval;
1782 +
1783 + retval = sprintf(buf, "%u\n", retu_rtc_alarm_expired);
1784 +
1785 + return retval;
1786 +}
1787 +
1788 +static ssize_t retu_rtc_alarm_expired_store(struct device *dev, struct device_attribute *attr,
1789 + const char *buf, size_t count)
1790 +{
1791 + retu_rtc_alarm_expired = 0;
1792 +
1793 + return count;
1794 +}
1795 +
1796 +static DEVICE_ATTR(alarm_expired, S_IRUGO | S_IWUSR, retu_rtc_alarm_expired_show,
1797 + retu_rtc_alarm_expired_store);
1798 +
1799 +
1800 +static ssize_t retu_rtc_cal_show(struct device *dev, struct device_attribute *attr,
1801 + char *buf)
1802 +{
1803 + u16 rtccalr1;
1804 +
1805 + mutex_lock(&retu_rtc_mutex);
1806 + rtccalr1 = retu_read_reg(RETU_REG_RTCCALR);
1807 + mutex_unlock(&retu_rtc_mutex);
1808 +
1809 + /*
1810 + * Shows the status of the Calibration Register.
1811 + *
1812 + * Default, after power loss: 0x0000
1813 + * Default, for R&D: 0x00C0
1814 + * Default, for factory: 0x00??
1815 + *
1816 + */
1817 + return sprintf(buf, "0x%04x\n", rtccalr1 & 0x00ff);
1818 +}
1819 +
1820 +static ssize_t retu_rtc_cal_store(struct device *dev, struct device_attribute *attr,
1821 + const char *buf, size_t count)
1822 +{
1823 + unsigned calibration_value;
1824 +
1825 + if (sscanf(buf, "%x", &calibration_value) != 1)
1826 + return count;
1827 +
1828 + mutex_lock(&retu_rtc_mutex);
1829 + retu_rtc_barrier();
1830 + retu_write_reg(RETU_REG_RTCCALR, calibration_value & 0x00ff);
1831 + mutex_unlock(&retu_rtc_mutex);
1832 +
1833 + return count;
1834 +}
1835 +
1836 +static DEVICE_ATTR(cal, S_IRUGO | S_IWUSR, retu_rtc_cal_show,
1837 + retu_rtc_cal_store);
1838 +
1839 +static struct platform_device retu_rtc_device;
1840 +
1841 +static void retu_rtca_disable(void)
1842 +{
1843 + retu_disable_irq(RETU_INT_RTCA);
1844 + retu_rtc_alarm_expired = 1;
1845 + retu_rtc_barrier();
1846 + retu_write_reg(RETU_REG_RTCHMAR, (24 << 8) | 60);
1847 +}
1848 +
1849 +static void retu_rtca_expired(struct work_struct *unused)
1850 +{
1851 + retu_rtca_disable();
1852 + sysfs_notify(&retu_rtc_device.dev.kobj, NULL, "alarm_expired");
1853 +}
1854 +
1855 +DECLARE_WORK(retu_rtca_work, retu_rtca_expired);
1856 +
1857 +/*
1858 + * RTCHMR RTCHMAR RTCCAL must be accessed within 0.9 s since the seconds
1859 + * interrupt has been signaled in the IDR register
1860 + */
1861 +static void retu_rtcs_interrupt(unsigned long unused)
1862 +{
1863 + retu_ack_irq(RETU_INT_RTCS);
1864 + complete_all(&retu_rtc_sync);
1865 +}
1866 +
1867 +static void retu_rtca_interrupt(unsigned long unused)
1868 +{
1869 + retu_ack_irq(RETU_INT_RTCA);
1870 + schedule_work(&retu_rtca_work);
1871 +}
1872 +
1873 +static int retu_rtc_init_irq(void)
1874 +{
1875 + int ret;
1876 +
1877 + ret = retu_request_irq(RETU_INT_RTCS, retu_rtcs_interrupt, 0, "RTCS");
1878 + if (ret != 0)
1879 + return ret;
1880 + /*
1881 + * We will take care of enabling and disabling the interrupt
1882 + * elsewhere, so leave it off by default..
1883 + */
1884 + retu_disable_irq(RETU_INT_RTCS);
1885 +
1886 + ret = retu_request_irq(RETU_INT_RTCA, retu_rtca_interrupt, 0, "RTCA");
1887 + if (ret != 0) {
1888 + retu_free_irq(RETU_INT_RTCS);
1889 + return ret;
1890 + }
1891 + retu_disable_irq(RETU_INT_RTCA);
1892 +
1893 + return 0;
1894 +}
1895 +
1896 +
1897 +static int __devinit retu_rtc_probe(struct device *dev)
1898 +{
1899 + int r;
1900 +
1901 + retu_rtc_alarm_expired = retu_read_reg(RETU_REG_IDR) &
1902 + (0x1 << RETU_INT_RTCA);
1903 +
1904 + if ((r = retu_rtc_init_irq()) != 0)
1905 + return r;
1906 +
1907 + mutex_init(&retu_rtc_mutex);
1908 +
1909 + /* If the calibration register is zero, we've probably lost
1910 + * power */
1911 + if (retu_read_reg(RETU_REG_RTCCALR) & 0x00ff)
1912 + retu_rtc_reset_occurred = 0;
1913 + else
1914 + retu_rtc_do_reset();
1915 +
1916 + if ((r = device_create_file(dev, &dev_attr_time)) != 0)
1917 + return r;
1918 + else if ((r = device_create_file(dev, &dev_attr_reset)) != 0)
1919 + goto err_unregister_time;
1920 + else if ((r = device_create_file(dev, &dev_attr_alarm)) != 0)
1921 + goto err_unregister_reset;
1922 + else if ((r = device_create_file(dev, &dev_attr_alarm_expired)) != 0)
1923 + goto err_unregister_alarm;
1924 + else if ((r = device_create_file(dev, &dev_attr_cal)) != 0)
1925 + goto err_unregister_alarm_expired;
1926 + else
1927 + return r;
1928 +
1929 +err_unregister_alarm_expired:
1930 + device_remove_file(dev, &dev_attr_alarm_expired);
1931 +err_unregister_alarm:
1932 + device_remove_file(dev, &dev_attr_alarm);
1933 +err_unregister_reset:
1934 + device_remove_file(dev, &dev_attr_reset);
1935 +err_unregister_time:
1936 + device_remove_file(dev, &dev_attr_time);
1937 + return r;
1938 +}
1939 +
1940 +static int __devexit retu_rtc_remove(struct device *dev)
1941 +{
1942 + retu_disable_irq(RETU_INT_RTCS);
1943 + retu_free_irq(RETU_INT_RTCS);
1944 + retu_free_irq(RETU_INT_RTCA);
1945 + device_remove_file(dev, &dev_attr_cal);
1946 + device_remove_file(dev, &dev_attr_alarm_expired);
1947 + device_remove_file(dev, &dev_attr_alarm);
1948 + device_remove_file(dev, &dev_attr_reset);
1949 + device_remove_file(dev, &dev_attr_time);
1950 + return 0;
1951 +}
1952 +
1953 +static struct device_driver retu_rtc_driver = {
1954 + .name = "retu-rtc",
1955 + .bus = &platform_bus_type,
1956 + .probe = retu_rtc_probe,
1957 + .remove = __devexit_p(retu_rtc_remove),
1958 +};
1959 +
1960 +static struct platform_device retu_rtc_device = {
1961 + .name = "retu-rtc",
1962 + .id = -1,
1963 + .dev = {
1964 + .release = retu_rtc_device_release,
1965 + },
1966 +};
1967 +
1968 +/* This function provides syncronization with the RTCS interrupt handler */
1969 +static void retu_rtc_barrier(void)
1970 +{
1971 + INIT_COMPLETION(retu_rtc_sync);
1972 + retu_ack_irq(RETU_INT_RTCS);
1973 + retu_enable_irq(RETU_INT_RTCS);
1974 + wait_for_completion(&retu_rtc_sync);
1975 + retu_disable_irq(RETU_INT_RTCS);
1976 +}
1977 +
1978 +static int __init retu_rtc_init(void)
1979 +{
1980 + int ret;
1981 +
1982 + init_completion(&retu_rtc_exited);
1983 +
1984 + if ((ret = driver_register(&retu_rtc_driver)) != 0)
1985 + return ret;
1986 +
1987 + if ((ret = platform_device_register(&retu_rtc_device)) != 0)
1988 + goto err_unregister_driver;
1989 +
1990 + return 0;
1991 +
1992 +err_unregister_driver:
1993 + driver_unregister(&retu_rtc_driver);
1994 + return ret;
1995 +}
1996 +
1997 +static void __exit retu_rtc_exit(void)
1998 +{
1999 + platform_device_unregister(&retu_rtc_device);
2000 + driver_unregister(&retu_rtc_driver);
2001 +
2002 + wait_for_completion(&retu_rtc_exited);
2003 +}
2004 +
2005 +module_init(retu_rtc_init);
2006 +module_exit(retu_rtc_exit);
2007 +
2008 +MODULE_DESCRIPTION("Retu RTC");
2009 +MODULE_LICENSE("GPL");
2010 +MODULE_AUTHOR("Paul Mundt and Igor Stoppa");
2011 Index: linux-2.6.37/drivers/cbus/retu-user.c
2012 ===================================================================
2013 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
2014 +++ linux-2.6.37/drivers/cbus/retu-user.c 2011-01-27 14:17:39.086000008 +0100
2015 @@ -0,0 +1,424 @@
2016 +/**
2017 + * drivers/cbus/retu-user.c
2018 + *
2019 + * Retu user space interface functions
2020 + *
2021 + * Copyright (C) 2004, 2005 Nokia Corporation
2022 + *
2023 + * Written by Mikko Ylinen <mikko.k.ylinen@nokia.com>
2024 + *
2025 + * This file is subject to the terms and conditions of the GNU General
2026 + * Public License. See the file "COPYING" in the main directory of this
2027 + * archive for more details.
2028 + *
2029 + * This program is distributed in the hope that it will be useful,
2030 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2031 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2032 + * GNU General Public License for more details.
2033 + *
2034 + * You should have received a copy of the GNU General Public License
2035 + * along with this program; if not, write to the Free Software
2036 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
2037 + */
2038 +
2039 +#include <linux/types.h>
2040 +#include <linux/kernel.h>
2041 +#include <linux/interrupt.h>
2042 +#include <linux/module.h>
2043 +#include <linux/init.h>
2044 +#include <linux/fs.h>
2045 +#include <linux/miscdevice.h>
2046 +#include <linux/poll.h>
2047 +#include <linux/list.h>
2048 +#include <linux/spinlock.h>
2049 +#include <linux/sched.h>
2050 +#include <linux/mutex.h>
2051 +#include <linux/slab.h>
2052 +
2053 +#include <asm/uaccess.h>
2054 +
2055 +#include "retu.h"
2056 +
2057 +#include "user_retu_tahvo.h"
2058 +
2059 +/* Maximum size of IRQ node buffer/pool */
2060 +#define RETU_MAX_IRQ_BUF_LEN 16
2061 +
2062 +#define PFX "retu-user: "
2063 +
2064 +/* Bitmap for marking the interrupt sources as having the handlers */
2065 +static u32 retu_irq_bits;
2066 +
2067 +/* For allowing only one user process to subscribe to the retu interrupts */
2068 +static struct file *retu_irq_subscr = NULL;
2069 +
2070 +/* For poll and IRQ passing */
2071 +struct retu_irq {
2072 + u32 id;
2073 + struct list_head node;
2074 +};
2075 +
2076 +static spinlock_t retu_irqs_lock;
2077 +static struct retu_irq *retu_irq_block;
2078 +static LIST_HEAD(retu_irqs);
2079 +static LIST_HEAD(retu_irqs_reserve);
2080 +
2081 +/* Wait queue - used when user wants to read the device */
2082 +DECLARE_WAIT_QUEUE_HEAD(retu_user_waitqueue);
2083 +
2084 +/* Semaphore to protect irq subscription sequence */
2085 +static struct mutex retu_mutex;
2086 +
2087 +/* This array specifies RETU register types (read/write/toggle) */
2088 +static const u8 retu_access_bits[] = {
2089 + 1,
2090 + 4,
2091 + 3,
2092 + 3,
2093 + 1,
2094 + 3,
2095 + 3,
2096 + 0,
2097 + 3,
2098 + 3,
2099 + 3,
2100 + 3,
2101 + 3,
2102 + 3,
2103 + 3,
2104 + 4,
2105 + 4,
2106 + 3,
2107 + 0,
2108 + 0,
2109 + 0,
2110 + 0,
2111 + 1,
2112 + 3,
2113 + 3,
2114 + 3,
2115 + 3,
2116 + 3,
2117 + 3,
2118 + 3,
2119 + 3,
2120 + 3
2121 +};
2122 +
2123 +/*
2124 + * The handler for all RETU interrupts.
2125 + *
2126 + * arg is the interrupt source in RETU.
2127 + */
2128 +static void retu_user_irq_handler(unsigned long arg)
2129 +{
2130 + struct retu_irq *irq;
2131 +
2132 + retu_ack_irq(arg);
2133 +
2134 + spin_lock(&retu_irqs_lock);
2135 + if (list_empty(&retu_irqs_reserve)) {
2136 + spin_unlock(&retu_irqs_lock);
2137 + return;
2138 + }
2139 + irq = list_entry((&retu_irqs_reserve)->next, struct retu_irq, node);
2140 + irq->id = arg;
2141 + list_move_tail(&irq->node, &retu_irqs);
2142 + spin_unlock(&retu_irqs_lock);
2143 +
2144 + /* wake up waiting thread */
2145 + wake_up(&retu_user_waitqueue);
2146 +}
2147 +
2148 +/*
2149 + * This routine sets up the interrupt handler and marks an interrupt source
2150 + * in RETU as a candidate for signal delivery to the user process.
2151 + */
2152 +static int retu_user_subscribe_to_irq(int id, struct file *filp)
2153 +{
2154 + int ret;
2155 +
2156 + mutex_lock(&retu_mutex);
2157 + if ((retu_irq_subscr != NULL) && (retu_irq_subscr != filp)) {
2158 + mutex_unlock(&retu_mutex);
2159 + return -EBUSY;
2160 + }
2161 + /* Store the file pointer of the first user process registering IRQs */
2162 + retu_irq_subscr = filp;
2163 + mutex_unlock(&retu_mutex);
2164 +
2165 + if (retu_irq_bits & (1 << id))
2166 + return 0;
2167 +
2168 + ret = retu_request_irq(id, retu_user_irq_handler, id, "");
2169 + if (ret < 0)
2170 + return ret;
2171 +
2172 + /* Mark that this interrupt has a handler */
2173 + retu_irq_bits |= 1 << id;
2174 +
2175 + return 0;
2176 +}
2177 +
2178 +/*
2179 + * Unregisters all RETU interrupt handlers.
2180 + */
2181 +static void retu_unreg_irq_handlers(void)
2182 +{
2183 + int id;
2184 +
2185 + if (!retu_irq_bits)
2186 + return;
2187 +
2188 + for (id = 0; id < MAX_RETU_IRQ_HANDLERS; id++)
2189 + if (retu_irq_bits & (1 << id))
2190 + retu_free_irq(id);
2191 +
2192 + retu_irq_bits = 0;
2193 +}
2194 +
2195 +/*
2196 + * Write to RETU register.
2197 + * Returns 0 upon success, a negative error value otherwise.
2198 + */
2199 +static int retu_user_write_with_mask(u32 field, u16 value)
2200 +{
2201 + u32 mask;
2202 + u32 reg;
2203 + u_short tmp;
2204 + unsigned long flags;
2205 +
2206 + mask = MASK(field);
2207 + reg = REG(field);
2208 +
2209 + /* Detect bad mask and reg */
2210 + if (mask == 0 || reg > RETU_REG_MAX ||
2211 + retu_access_bits[reg] == READ_ONLY) {
2212 + printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
2213 + reg, mask);
2214 + return -EINVAL;
2215 + }
2216 +
2217 + /* Justify value according to mask */
2218 + while (!(mask & 1)) {
2219 + value = value << 1;
2220 + mask = mask >> 1;
2221 + }
2222 +
2223 + spin_lock_irqsave(&retu_lock, flags);
2224 + if (retu_access_bits[reg] == TOGGLE) {
2225 + /* No need to detect previous content of register */
2226 + tmp = 0;
2227 + } else {
2228 + /* Read current value of register */
2229 + tmp = retu_read_reg(reg);
2230 + }
2231 +
2232 + /* Generate new value */
2233 + tmp = (tmp & ~MASK(field)) | (value & MASK(field));
2234 + /* Write data to RETU */
2235 + retu_write_reg(reg, tmp);
2236 + spin_unlock_irqrestore(&retu_lock, flags);
2237 +
2238 + return 0;
2239 +}
2240 +
2241 +/*
2242 + * Read RETU register.
2243 + */
2244 +static u32 retu_user_read_with_mask(u32 field)
2245 +{
2246 + u_short value;
2247 + u32 mask, reg;
2248 +
2249 + mask = MASK(field);
2250 + reg = REG(field);
2251 +
2252 + /* Detect bad mask and reg */
2253 + if (mask == 0 || reg > RETU_REG_MAX) {
2254 + printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
2255 + reg, mask);
2256 + return -EINVAL;
2257 + }
2258 +
2259 + /* Read the register */
2260 + value = retu_read_reg(reg) & mask;
2261 +
2262 + /* Right justify value */
2263 + while (!(mask & 1)) {
2264 + value = value >> 1;
2265 + mask = mask >> 1;
2266 + }
2267 +
2268 + return value;
2269 +}
2270 +
2271 +/*
2272 + * Close device
2273 + */
2274 +static int retu_close(struct inode *inode, struct file *filp)
2275 +{
2276 + /* Unregister all interrupts that have been registered */
2277 + if (retu_irq_subscr == filp) {
2278 + retu_unreg_irq_handlers();
2279 + retu_irq_subscr = NULL;
2280 + }
2281 +
2282 + return 0;
2283 +}
2284 +
2285 +/*
2286 + * Device control (ioctl)
2287 + */
2288 +static long retu_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
2289 +{
2290 + struct retu_tahvo_write_parms par;
2291 + int ret;
2292 +
2293 + switch (cmd) {
2294 + case URT_IOCT_IRQ_SUBSCR:
2295 + return retu_user_subscribe_to_irq(arg, filp);
2296 + case RETU_IOCH_READ:
2297 + return retu_user_read_with_mask(arg);
2298 + case RETU_IOCX_WRITE:
2299 + ret = copy_from_user(&par, (void __user *) arg, sizeof(par));
2300 + if (ret)
2301 + printk(KERN_ERR "copy_from_user failed: %d\n", ret);
2302 + par.result = retu_user_write_with_mask(par.field, par.value);
2303 + ret = copy_to_user((void __user *) arg, &par, sizeof(par));
2304 + if (ret)
2305 + printk(KERN_ERR "copy_to_user failed: %d\n", ret);
2306 + break;
2307 + case RETU_IOCH_ADC_READ:
2308 + return retu_read_adc(arg);
2309 + default:
2310 + return -ENOIOCTLCMD;
2311 + }
2312 + return 0;
2313 +}
2314 +
2315 +/*
2316 + * Read from device
2317 + */
2318 +static ssize_t retu_read(struct file *filp, char *buf, size_t count,
2319 + loff_t * offp)
2320 +{
2321 + struct retu_irq *irq;
2322 +
2323 + u32 nr, i;
2324 +
2325 + /* read not permitted if neither filp nor anyone has registered IRQs */
2326 + if (retu_irq_subscr != filp)
2327 + return -EPERM;
2328 +
2329 + if ((count < sizeof(u32)) || ((count % sizeof(u32)) != 0))
2330 + return -EINVAL;
2331 +
2332 + nr = count / sizeof(u32);
2333 +
2334 + for (i = 0; i < nr; i++) {
2335 + unsigned long flags;
2336 + u32 irq_id;
2337 + int ret;
2338 +
2339 + ret = wait_event_interruptible(retu_user_waitqueue,
2340 + !list_empty(&retu_irqs));
2341 + if (ret < 0)
2342 + return ret;
2343 +
2344 + spin_lock_irqsave(&retu_irqs_lock, flags);
2345 + irq = list_entry((&retu_irqs)->next, struct retu_irq, node);
2346 + irq_id = irq->id;
2347 + list_move(&irq->node, &retu_irqs_reserve);
2348 + spin_unlock_irqrestore(&retu_irqs_lock, flags);
2349 +
2350 + ret = copy_to_user(buf + i * sizeof(irq_id), &irq_id,
2351 + sizeof(irq_id));
2352 + if (ret)
2353 + printk(KERN_ERR "copy_to_user failed: %d\n", ret);
2354 + }
2355 +
2356 + return count;
2357 +}
2358 +
2359 +/*
2360 + * Poll method
2361 + */
2362 +static unsigned retu_poll(struct file *filp, struct poll_table_struct *pt)
2363 +{
2364 + if (!list_empty(&retu_irqs))
2365 + return POLLIN;
2366 +
2367 + poll_wait(filp, &retu_user_waitqueue, pt);
2368 +
2369 + if (!list_empty(&retu_irqs))
2370 + return POLLIN;
2371 + else
2372 + return 0;
2373 +}
2374 +
2375 +static struct file_operations retu_user_fileops = {
2376 + .owner = THIS_MODULE,
2377 + .unlocked_ioctl = retu_ioctl,
2378 + .read = retu_read,
2379 + .release = retu_close,
2380 + .poll = retu_poll
2381 +};
2382 +
2383 +static struct miscdevice retu_device = {
2384 + .minor = MISC_DYNAMIC_MINOR,
2385 + .name = "retu",
2386 + .fops = &retu_user_fileops
2387 +};
2388 +
2389 +/*
2390 + * Initialization
2391 + *
2392 + * @return 0 if successful, error value otherwise.
2393 + */
2394 +int retu_user_init(void)
2395 +{
2396 + struct retu_irq *irq;
2397 + int res, i;
2398 +
2399 + irq = kmalloc(sizeof(*irq) * RETU_MAX_IRQ_BUF_LEN, GFP_KERNEL);
2400 + if (irq == NULL) {
2401 + printk(KERN_ERR PFX "kmalloc failed\n");
2402 + return -ENOMEM;
2403 + }
2404 + memset(irq, 0, sizeof(*irq) * RETU_MAX_IRQ_BUF_LEN);
2405 + for (i = 0; i < RETU_MAX_IRQ_BUF_LEN; i++)
2406 + list_add(&irq[i].node, &retu_irqs_reserve);
2407 +
2408 + retu_irq_block = irq;
2409 +
2410 + spin_lock_init(&retu_irqs_lock);
2411 + mutex_init(&retu_mutex);
2412 +
2413 + /* Request a misc device */
2414 + res = misc_register(&retu_device);
2415 + if (res < 0) {
2416 + printk(KERN_ERR PFX "unable to register misc device for %s\n",
2417 + retu_device.name);
2418 + kfree(irq);
2419 + return res;
2420 + }
2421 +
2422 + return 0;
2423 +}
2424 +
2425 +/*
2426 + * Cleanup.
2427 + */
2428 +void retu_user_cleanup(void)
2429 +{
2430 + /* Unregister our misc device */
2431 + misc_deregister(&retu_device);
2432 + /* Unregister and disable all RETU interrupts used by this module */
2433 + retu_unreg_irq_handlers();
2434 + kfree(retu_irq_block);
2435 +}
2436 +
2437 +MODULE_DESCRIPTION("Retu ASIC user space functions");
2438 +MODULE_LICENSE("GPL");
2439 +MODULE_AUTHOR("Mikko Ylinen");
2440 Index: linux-2.6.37/drivers/cbus/retu-wdt.c
2441 ===================================================================
2442 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
2443 +++ linux-2.6.37/drivers/cbus/retu-wdt.c 2011-01-27 14:17:39.086000008 +0100
2444 @@ -0,0 +1,387 @@
2445 +/**
2446 + * drivers/cbus/retu-wdt.c
2447 + *
2448 + * Driver for Retu watchdog
2449 + *
2450 + * Copyright (C) 2004, 2005 Nokia Corporation
2451 + *
2452 + * Written by Amit Kucheria <amit.kucheria@nokia.com>
2453 + *
2454 + * This file is subject to the terms and conditions of the GNU General
2455 + * Public License. See the file "COPYING" in the main directory of this
2456 + * archive for more details.
2457 + *
2458 + * This program is distributed in the hope that it will be useful,
2459 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2460 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2461 + * GNU General Public License for more details.
2462 + *
2463 + * You should have received a copy of the GNU General Public License
2464 + * along with this program; if not, write to the Free Software
2465 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
2466 + */
2467 +
2468 +#include <linux/kernel.h>
2469 +#include <linux/module.h>
2470 +#include <linux/device.h>
2471 +#include <linux/init.h>
2472 +#include <linux/fs.h>
2473 +#include <linux/io.h>
2474 +#include <linux/platform_device.h>
2475 +#include <linux/slab.h>
2476 +
2477 +#include <linux/completion.h>
2478 +#include <linux/errno.h>
2479 +#include <linux/moduleparam.h>
2480 +#include <linux/platform_device.h>
2481 +#include <linux/miscdevice.h>
2482 +#include <linux/watchdog.h>
2483 +
2484 +#include <asm/uaccess.h>
2485 +
2486 +#include <plat/prcm.h>
2487 +
2488 +#include "cbus.h"
2489 +#include "retu.h"
2490 +
2491 +/* Watchdog timeout in seconds */
2492 +#define RETU_WDT_MIN_TIMER 0
2493 +#define RETU_WDT_DEFAULT_TIMER 32
2494 +#define RETU_WDT_MAX_TIMER 63
2495 +
2496 +static struct completion retu_wdt_completion;
2497 +static DEFINE_MUTEX(retu_wdt_mutex);
2498 +
2499 +/* Current period of watchdog */
2500 +static unsigned int period_val = RETU_WDT_DEFAULT_TIMER;
2501 +static int counter_param = RETU_WDT_MAX_TIMER;
2502 +
2503 +struct retu_wdt_dev {
2504 + struct device *dev;
2505 + int users;
2506 + struct miscdevice retu_wdt_miscdev;
2507 + struct timer_list ping_timer;
2508 +};
2509 +
2510 +static struct retu_wdt_dev *retu_wdt;
2511 +
2512 +static void retu_wdt_set_ping_timer(unsigned long enable);
2513 +
2514 +static int _retu_modify_counter(unsigned int new)
2515 +{
2516 + retu_write_reg(RETU_REG_WATCHDOG, (u16)new);
2517 +
2518 + return 0;
2519 +}
2520 +
2521 +static int retu_modify_counter(unsigned int new)
2522 +{
2523 + if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER)
2524 + return -EINVAL;
2525 +
2526 + mutex_lock(&retu_wdt_mutex);
2527 + period_val = new;
2528 + _retu_modify_counter(period_val);
2529 + mutex_unlock(&retu_wdt_mutex);
2530 +
2531 + return 0;
2532 +}
2533 +
2534 +static ssize_t retu_wdt_period_show(struct device *dev,
2535 + struct device_attribute *attr, char *buf)
2536 +{
2537 + /* Show current max counter */
2538 + return sprintf(buf, "%u\n", (u16)period_val);
2539 +}
2540 +
2541 +/*
2542 + * Note: This inteface is non-standard and likely to disappear!
2543 + * Use /dev/watchdog instead, that's the standard.
2544 + */
2545 +static ssize_t retu_wdt_period_store(struct device *dev,
2546 + struct device_attribute *attr,
2547 + const char *buf, size_t count)
2548 +{
2549 + unsigned int new_period;
2550 + int ret;
2551 +
2552 +#ifdef CONFIG_WATCHDOG_NOWAYOUT
2553 + retu_wdt_set_ping_timer(0);
2554 +#endif
2555 +
2556 + if (sscanf(buf, "%u", &new_period) != 1) {
2557 + printk(KERN_ALERT "retu_wdt_period_store: Invalid input\n");
2558 + return -EINVAL;
2559 + }
2560 +
2561 + ret = retu_modify_counter(new_period);
2562 + if (ret < 0)
2563 + return ret;
2564 +
2565 + return strnlen(buf, count);
2566 +}
2567 +
2568 +static ssize_t retu_wdt_counter_show(struct device *dev,
2569 + struct device_attribute *attr, char *buf)
2570 +{
2571 + u16 counter;
2572 +
2573 + /* Show current value in watchdog counter */
2574 + counter = retu_read_reg(RETU_REG_WATCHDOG);
2575 +
2576 + /* Only the 5 LSB are important */
2577 + return snprintf(buf, PAGE_SIZE, "%u\n", (counter & 0x3F));
2578 +}
2579 +
2580 +static DEVICE_ATTR(period, S_IRUGO | S_IWUSR, retu_wdt_period_show, \
2581 + retu_wdt_period_store);
2582 +static DEVICE_ATTR(counter, S_IRUGO, retu_wdt_counter_show, NULL);
2583 +
2584 +/*----------------------------------------------------------------------------*/
2585 +
2586 +/*
2587 + * Since retu watchdog cannot be disabled in hardware, we must kick it
2588 + * with a timer until userspace watchdog software takes over. Do this
2589 + * unless /dev/watchdog is open or CONFIG_WATCHDOG_NOWAYOUT is set.
2590 + */
2591 +static void retu_wdt_set_ping_timer(unsigned long enable)
2592 +{
2593 + _retu_modify_counter(RETU_WDT_MAX_TIMER);
2594 + if (enable)
2595 + mod_timer(&retu_wdt->ping_timer,
2596 + jiffies + RETU_WDT_DEFAULT_TIMER * HZ);
2597 + else
2598 + del_timer_sync(&retu_wdt->ping_timer);
2599 +}
2600 +
2601 +static int retu_wdt_open(struct inode *inode, struct file *file)
2602 +{
2603 + if (test_and_set_bit(1, (unsigned long *)&(retu_wdt->users)))
2604 + return -EBUSY;
2605 +
2606 + file->private_data = (void *)retu_wdt;
2607 + retu_wdt_set_ping_timer(0);
2608 +
2609 + return nonseekable_open(inode, file);
2610 +}
2611 +
2612 +static int retu_wdt_release(struct inode *inode, struct file *file)
2613 +{
2614 + struct retu_wdt_dev *wdev = file->private_data;
2615 +
2616 +#ifndef CONFIG_WATCHDOG_NOWAYOUT
2617 + retu_wdt_set_ping_timer(1);
2618 +#endif
2619 + wdev->users = 0;
2620 +
2621 + return 0;
2622 +}
2623 +
2624 +static ssize_t retu_wdt_write(struct file *file, const char __user *data,
2625 + size_t len, loff_t *ppos)
2626 +{
2627 + if (len)
2628 + retu_modify_counter(RETU_WDT_MAX_TIMER);
2629 +
2630 + return len;
2631 +}
2632 +
2633 +static long retu_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2634 +{
2635 + int new_margin;
2636 +
2637 + static struct watchdog_info ident = {
2638 + .identity = "Retu Watchdog",
2639 + .options = WDIOF_SETTIMEOUT,
2640 + .firmware_version = 0,
2641 + };
2642 +
2643 + switch (cmd) {
2644 + default:
2645 + return -ENOTTY;
2646 + case WDIOC_GETSUPPORT:
2647 + return copy_to_user((struct watchdog_info __user *)arg, &ident,
2648 + sizeof(ident));
2649 + case WDIOC_GETSTATUS:
2650 + return put_user(0, (int __user *)arg);
2651 + case WDIOC_GETBOOTSTATUS:
2652 + if (cpu_is_omap16xx())
2653 + return put_user(omap_readw(ARM_SYSST),
2654 + (int __user *)arg);
2655 + if (cpu_is_omap24xx())
2656 + return put_user(omap_prcm_get_reset_sources(),
2657 + (int __user *)arg);
2658 + case WDIOC_KEEPALIVE:
2659 + retu_modify_counter(RETU_WDT_MAX_TIMER);
2660 + break;
2661 + case WDIOC_SETTIMEOUT:
2662 + if (get_user(new_margin, (int __user *)arg))
2663 + return -EFAULT;
2664 + retu_modify_counter(new_margin);
2665 + /* Fall through */
2666 + case WDIOC_GETTIMEOUT:
2667 + return put_user(period_val, (int __user *)arg);
2668 + }
2669 +
2670 + return 0;
2671 +}
2672 +
2673 +/* Start kicking retu watchdog until user space starts doing the kicking */
2674 +static int __init retu_wdt_ping(void)
2675 +{
2676 +
2677 +#ifdef CONFIG_WATCHDOG_NOWAYOUT
2678 + retu_modify_counter(RETU_WDT_MAX_TIMER);
2679 +#else
2680 + retu_wdt_set_ping_timer(1);
2681 +#endif
2682 +
2683 + return 0;
2684 +}
2685 +late_initcall(retu_wdt_ping);
2686 +
2687 +static const struct file_operations retu_wdt_fops = {
2688 + .owner = THIS_MODULE,
2689 + .write = retu_wdt_write,
2690 + .unlocked_ioctl = retu_wdt_ioctl,
2691 + .open = retu_wdt_open,
2692 + .release = retu_wdt_release,
2693 +};
2694 +
2695 +/*----------------------------------------------------------------------------*/
2696 +
2697 +static int __devinit retu_wdt_probe(struct device *dev)
2698 +{
2699 + struct retu_wdt_dev *wdev;
2700 + int ret;
2701 +
2702 + wdev = kzalloc(sizeof(struct retu_wdt_dev), GFP_KERNEL);
2703 + if (!wdev)
2704 + return -ENOMEM;
2705 +
2706 + wdev->users = 0;
2707 +
2708 + ret = device_create_file(dev, &dev_attr_period);
2709 + if (ret) {
2710 + printk(KERN_ERR "retu_wdt_probe: Error creating "
2711 + "sys device file: period\n");
2712 + goto free1;
2713 + }
2714 +
2715 + ret = device_create_file(dev, &dev_attr_counter);
2716 + if (ret) {
2717 + printk(KERN_ERR "retu_wdt_probe: Error creating "
2718 + "sys device file: counter\n");
2719 + goto free2;
2720 + }
2721 +
2722 + dev_set_drvdata(dev, wdev);
2723 + retu_wdt = wdev;
2724 + wdev->retu_wdt_miscdev.parent = dev;
2725 + wdev->retu_wdt_miscdev.minor = WATCHDOG_MINOR;
2726 + wdev->retu_wdt_miscdev.name = "watchdog";
2727 + wdev->retu_wdt_miscdev.fops = &retu_wdt_fops;
2728 +
2729 + ret = misc_register(&(wdev->retu_wdt_miscdev));
2730 + if (ret)
2731 + goto free3;
2732 +
2733 + setup_timer(&wdev->ping_timer, retu_wdt_set_ping_timer, 1);
2734 +
2735 + /* Kick the watchdog for kernel booting to finish */
2736 + retu_modify_counter(RETU_WDT_MAX_TIMER);
2737 +
2738 + return 0;
2739 +
2740 +free3:
2741 + device_remove_file(dev, &dev_attr_counter);
2742 +
2743 +free2:
2744 + device_remove_file(dev, &dev_attr_period);
2745 +free1:
2746 + kfree(wdev);
2747 +
2748 + return ret;
2749 +}
2750 +
2751 +static int __devexit retu_wdt_remove(struct device *dev)
2752 +{
2753 + struct retu_wdt_dev *wdev;
2754 +
2755 + wdev = dev_get_drvdata(dev);
2756 + misc_deregister(&(wdev->retu_wdt_miscdev));
2757 + device_remove_file(dev, &dev_attr_period);
2758 + device_remove_file(dev, &dev_attr_counter);
2759 + kfree(wdev);
2760 +
2761 + return 0;
2762 +}
2763 +
2764 +static void retu_wdt_device_release(struct device *dev)
2765 +{
2766 + complete(&retu_wdt_completion);
2767 +}
2768 +
2769 +static struct platform_device retu_wdt_device = {
2770 + .name = "retu-watchdog",
2771 + .id = -1,
2772 + .dev = {
2773 + .release = retu_wdt_device_release,
2774 + },
2775 +};
2776 +
2777 +static struct device_driver retu_wdt_driver = {
2778 + .name = "retu-watchdog",
2779 + .bus = &platform_bus_type,
2780 + .probe = retu_wdt_probe,
2781 + .remove = __devexit_p(retu_wdt_remove),
2782 +};
2783 +
2784 +static int __init retu_wdt_init(void)
2785 +{
2786 + int ret;
2787 +
2788 + init_completion(&retu_wdt_completion);
2789 +
2790 + ret = driver_register(&retu_wdt_driver);
2791 + if (ret)
2792 + return ret;
2793 +
2794 + ret = platform_device_register(&retu_wdt_device);
2795 + if (ret)
2796 + goto exit1;
2797 +
2798 + /* passed as module parameter? */
2799 + ret = retu_modify_counter(counter_param);
2800 + if (ret == -EINVAL) {
2801 + ret = retu_modify_counter(RETU_WDT_DEFAULT_TIMER);
2802 + printk(KERN_INFO
2803 + "retu_wdt_init: Intializing to default value\n");
2804 + }
2805 +
2806 + printk(KERN_INFO "Retu watchdog driver initialized\n");
2807 + return ret;
2808 +
2809 +exit1:
2810 + driver_unregister(&retu_wdt_driver);
2811 + wait_for_completion(&retu_wdt_completion);
2812 +
2813 + return ret;
2814 +}
2815 +
2816 +static void __exit retu_wdt_exit(void)
2817 +{
2818 + platform_device_unregister(&retu_wdt_device);
2819 + driver_unregister(&retu_wdt_driver);
2820 +
2821 + wait_for_completion(&retu_wdt_completion);
2822 +}
2823 +
2824 +module_init(retu_wdt_init);
2825 +module_exit(retu_wdt_exit);
2826 +module_param(counter_param, int, 0);
2827 +
2828 +MODULE_DESCRIPTION("Retu WatchDog");
2829 +MODULE_AUTHOR("Amit Kucheria");
2830 +MODULE_LICENSE("GPL");
2831 +
2832 Index: linux-2.6.37/drivers/cbus/tahvo.c
2833 ===================================================================
2834 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
2835 +++ linux-2.6.37/drivers/cbus/tahvo.c 2011-01-27 14:17:39.086000008 +0100
2836 @@ -0,0 +1,443 @@
2837 +/**
2838 + * drivers/cbus/tahvo.c
2839 + *
2840 + * Support functions for Tahvo ASIC
2841 + *
2842 + * Copyright (C) 2004, 2005 Nokia Corporation
2843 + *
2844 + * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
2845 + * David Weinehall <david.weinehall@nokia.com>, and
2846 + * Mikko Ylinen <mikko.k.ylinen@nokia.com>
2847 + *
2848 + * This file is subject to the terms and conditions of the GNU General
2849 + * Public License. See the file "COPYING" in the main directory of this
2850 + * archive for more details.
2851 + *
2852 + * This program is distributed in the hope that it will be useful,
2853 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
2854 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2855 + * GNU General Public License for more details.
2856 + *
2857 + * You should have received a copy of the GNU General Public License
2858 + * along with this program; if not, write to the Free Software
2859 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
2860 + */
2861 +
2862 +#include <linux/module.h>
2863 +#include <linux/init.h>
2864 +
2865 +#include <linux/kernel.h>
2866 +#include <linux/errno.h>
2867 +#include <linux/device.h>
2868 +#include <linux/miscdevice.h>
2869 +#include <linux/poll.h>
2870 +#include <linux/fs.h>
2871 +#include <linux/irq.h>
2872 +#include <linux/interrupt.h>
2873 +#include <linux/platform_device.h>
2874 +#include <linux/gpio.h>
2875 +
2876 +#include <asm/uaccess.h>
2877 +#include <asm/mach-types.h>
2878 +
2879 +#include <plat/mux.h>
2880 +#include <plat/board.h>
2881 +
2882 +#include "cbus.h"
2883 +#include "tahvo.h"
2884 +
2885 +#define TAHVO_ID 0x02
2886 +#define PFX "tahvo: "
2887 +
2888 +static int tahvo_initialized;
2889 +static int tahvo_irq_pin;
2890 +static int tahvo_is_betty;
2891 +
2892 +static struct tasklet_struct tahvo_tasklet;
2893 +spinlock_t tahvo_lock = SPIN_LOCK_UNLOCKED;
2894 +
2895 +static struct completion device_release;
2896 +
2897 +struct tahvo_irq_handler_desc {
2898 + int (*func)(unsigned long);
2899 + unsigned long arg;
2900 + char name[8];
2901 +};
2902 +
2903 +static struct tahvo_irq_handler_desc tahvo_irq_handlers[MAX_TAHVO_IRQ_HANDLERS];
2904 +
2905 +/**
2906 + * tahvo_read_reg - Read a value from a register in Tahvo
2907 + * @reg: the register to read from
2908 + *
2909 + * This function returns the contents of the specified register
2910 + */
2911 +int tahvo_read_reg(int reg)
2912 +{
2913 + BUG_ON(!tahvo_initialized);
2914 + return cbus_read_reg(cbus_host, TAHVO_ID, reg);
2915 +}
2916 +
2917 +/**
2918 + * tahvo_write_reg - Write a value to a register in Tahvo
2919 + * @reg: the register to write to
2920 + * @reg: the value to write to the register
2921 + *
2922 + * This function writes a value to the specified register
2923 + */
2924 +void tahvo_write_reg(int reg, u16 val)
2925 +{
2926 + BUG_ON(!tahvo_initialized);
2927 + cbus_write_reg(cbus_host, TAHVO_ID, reg, val);
2928 +}
2929 +
2930 +/**
2931 + * tahvo_set_clear_reg_bits - set and clear register bits atomically
2932 + * @reg: the register to write to
2933 + * @bits: the bits to set
2934 + *
2935 + * This function sets and clears the specified Tahvo register bits atomically
2936 + */
2937 +void tahvo_set_clear_reg_bits(int reg, u16 set, u16 clear)
2938 +{
2939 + unsigned long flags;
2940 + u16 w;
2941 +
2942 + spin_lock_irqsave(&tahvo_lock, flags);
2943 + w = tahvo_read_reg(reg);
2944 + w &= ~clear;
2945 + w |= set;
2946 + tahvo_write_reg(reg, w);
2947 + spin_unlock_irqrestore(&tahvo_lock, flags);
2948 +}
2949 +
2950 +/*
2951 + * Disable given TAHVO interrupt
2952 + */
2953 +void tahvo_disable_irq(int id)
2954 +{
2955 + unsigned long flags;
2956 + u16 mask;
2957 +
2958 + spin_lock_irqsave(&tahvo_lock, flags);
2959 + mask = tahvo_read_reg(TAHVO_REG_IMR);
2960 + mask |= 1 << id;
2961 + tahvo_write_reg(TAHVO_REG_IMR, mask);
2962 + spin_unlock_irqrestore(&tahvo_lock, flags);
2963 +}
2964 +
2965 +/*
2966 + * Enable given TAHVO interrupt
2967 + */
2968 +void tahvo_enable_irq(int id)
2969 +{
2970 + unsigned long flags;
2971 + u16 mask;
2972 +
2973 + spin_lock_irqsave(&tahvo_lock, flags);
2974 + mask = tahvo_read_reg(TAHVO_REG_IMR);
2975 + mask &= ~(1 << id);
2976 + tahvo_write_reg(TAHVO_REG_IMR, mask);
2977 + spin_unlock_irqrestore(&tahvo_lock, flags);
2978 +}
2979 +
2980 +/*
2981 + * Acknowledge given TAHVO interrupt
2982 + */
2983 +void tahvo_ack_irq(int id)
2984 +{
2985 + tahvo_write_reg(TAHVO_REG_IDR, 1 << id);
2986 +}
2987 +
2988 +static int tahvo_7bit_backlight;
2989 +
2990 +int tahvo_get_backlight_level(void)
2991 +{
2992 + int mask;
2993 +
2994 + if (tahvo_7bit_backlight)
2995 + mask = 0x7f;
2996 + else
2997 + mask = 0x0f;
2998 + return tahvo_read_reg(TAHVO_REG_LEDPWMR) & mask;
2999 +}
3000 +
3001 +int tahvo_get_max_backlight_level(void)
3002 +{
3003 + if (tahvo_7bit_backlight)
3004 + return 0x7f;
3005 + else
3006 + return 0x0f;
3007 +}
3008 +
3009 +void tahvo_set_backlight_level(int level)
3010 +{
3011 + int max_level;
3012 +
3013 + max_level = tahvo_get_max_backlight_level();
3014 + if (level > max_level)
3015 + level = max_level;
3016 + tahvo_write_reg(TAHVO_REG_LEDPWMR, level);
3017 +}
3018 +
3019 +/*
3020 + * TAHVO interrupt handler. Only schedules the tasklet.
3021 + */
3022 +static irqreturn_t tahvo_irq_handler(int irq, void *dev_id)
3023 +{
3024 + tasklet_schedule(&tahvo_tasklet);
3025 + return IRQ_HANDLED;
3026 +}
3027 +
3028 +/*
3029 + * Tasklet handler
3030 + */
3031 +static void tahvo_tasklet_handler(unsigned long data)
3032 +{
3033 + struct tahvo_irq_handler_desc *hnd;
3034 + u16 id;
3035 + u16 im;
3036 + int i;
3037 +
3038 + for (;;) {
3039 + id = tahvo_read_reg(TAHVO_REG_IDR);
3040 + im = ~tahvo_read_reg(TAHVO_REG_IMR);
3041 + id &= im;
3042 +
3043 + if (!id)
3044 + break;
3045 +
3046 + for (i = 0; id != 0; i++, id >>= 1) {
3047 + if (!(id & 1))
3048 + continue;
3049 + hnd = &tahvo_irq_handlers[i];
3050 + if (hnd->func == NULL) {
3051 + /* Spurious tahvo interrupt - just ack it */
3052 + printk(KERN_INFO "Spurious Tahvo interrupt "
3053 + "(id %d)\n", i);
3054 + tahvo_disable_irq(i);
3055 + tahvo_ack_irq(i);
3056 + continue;
3057 + }
3058 + hnd->func(hnd->arg);
3059 + /*
3060 + * Don't acknowledge the interrupt here
3061 + * It must be done explicitly
3062 + */
3063 + }
3064 + }
3065 +}
3066 +
3067 +/*
3068 + * Register the handler for a given TAHVO interrupt source.
3069 + */
3070 +int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name)
3071 +{
3072 + struct tahvo_irq_handler_desc *hnd;
3073 +
3074 + if (irq_handler == NULL || id >= MAX_TAHVO_IRQ_HANDLERS ||
3075 + name == NULL) {
3076 + printk(KERN_ERR PFX "Invalid arguments to %s\n",
3077 + __FUNCTION__);
3078 + return -EINVAL;
3079 + }
3080 + hnd = &tahvo_irq_handlers[id];
3081 + if (hnd->func != NULL) {
3082 + printk(KERN_ERR PFX "IRQ %d already reserved\n", id);
3083 + return -EBUSY;
3084 + }
3085 + printk(KERN_INFO PFX "Registering interrupt %d for device %s\n",
3086 + id, name);
3087 + hnd->func = irq_handler;
3088 + hnd->arg = arg;
3089 + strlcpy(hnd->name, name, sizeof(hnd->name));
3090 +
3091 + tahvo_ack_irq(id);
3092 + tahvo_enable_irq(id);
3093 +
3094 + return 0;
3095 +}
3096 +
3097 +/*
3098 + * Unregister the handler for a given TAHVO interrupt source.
3099 + */
3100 +void tahvo_free_irq(int id)
3101 +{
3102 + struct tahvo_irq_handler_desc *hnd;
3103 +
3104 + if (id >= MAX_TAHVO_IRQ_HANDLERS) {
3105 + printk(KERN_ERR PFX "Invalid argument to %s\n",
3106 + __FUNCTION__);
3107 + return;
3108 + }
3109 + hnd = &tahvo_irq_handlers[id];
3110 + if (hnd->func == NULL) {
3111 + printk(KERN_ERR PFX "IRQ %d already freed\n", id);
3112 + return;
3113 + }
3114 +
3115 + tahvo_disable_irq(id);
3116 + hnd->func = NULL;
3117 +}
3118 +
3119 +/**
3120 + * tahvo_probe - Probe for Tahvo ASIC
3121 + * @dev: the Tahvo device
3122 + *
3123 + * Probe for the Tahvo ASIC and allocate memory
3124 + * for its device-struct if found
3125 + */
3126 +static int __devinit tahvo_probe(struct device *dev)
3127 +{
3128 + int rev, id, ret;
3129 +
3130 + /* Prepare tasklet */
3131 + tasklet_init(&tahvo_tasklet, tahvo_tasklet_handler, 0);
3132 +
3133 + tahvo_initialized = 1;
3134 +
3135 + rev = tahvo_read_reg(TAHVO_REG_ASICR);
3136 +
3137 + id = (rev >> 8) & 0xff;
3138 + if (id == 0x03) {
3139 + if ((rev & 0xff) >= 0x50)
3140 + tahvo_7bit_backlight = 1;
3141 + } else if (id == 0x0b) {
3142 + tahvo_is_betty = 1;
3143 + tahvo_7bit_backlight = 1;
3144 + } else {
3145 + printk(KERN_ERR "Tahvo/Betty chip not found");
3146 + return -ENODEV;
3147 + }
3148 +
3149 + printk(KERN_INFO "%s v%d.%d found\n", tahvo_is_betty ? "Betty" : "Tahvo",
3150 + (rev >> 4) & 0x0f, rev & 0x0f);
3151 +
3152 + /* REVISIT: Pass these from board-*.c files in platform_data */
3153 + if (machine_is_nokia770()) {
3154 + tahvo_irq_pin = 40;
3155 + } else if (machine_is_nokia_n800() || machine_is_nokia_n810() ||
3156 + machine_is_nokia_n810_wimax()) {
3157 + tahvo_irq_pin = 111;
3158 + } else {
3159 + printk(KERN_ERR "cbus: Unsupported board for tahvo\n");
3160 + return -ENODEV;
3161 + }
3162 +
3163 + if ((ret = gpio_request(tahvo_irq_pin, "TAHVO irq")) < 0) {
3164 + printk(KERN_ERR PFX "Unable to reserve IRQ GPIO\n");
3165 + return ret;
3166 + }
3167 +
3168 + /* Set the pin as input */
3169 + gpio_direction_input(tahvo_irq_pin);
3170 +
3171 + /* Rising edge triggers the IRQ */
3172 + set_irq_type(gpio_to_irq(tahvo_irq_pin), IRQ_TYPE_EDGE_RISING);
3173 +
3174 + /* Mask all TAHVO interrupts */
3175 + tahvo_write_reg(TAHVO_REG_IMR, 0xffff);
3176 +
3177 + ret = request_irq(gpio_to_irq(tahvo_irq_pin), tahvo_irq_handler, 0,
3178 + "tahvo", 0);
3179 + if (ret < 0) {
3180 + printk(KERN_ERR PFX "Unable to register IRQ handler\n");
3181 + gpio_free(tahvo_irq_pin);
3182 + return ret;
3183 + }
3184 +#ifdef CONFIG_CBUS_TAHVO_USER
3185 + /* Initialize user-space interface */
3186 + if (tahvo_user_init() < 0) {
3187 + printk(KERN_ERR "Unable to initialize driver\n");
3188 + free_irq(gpio_to_irq(tahvo_irq_pin), 0);
3189 + gpio_free(tahvo_irq_pin);
3190 + return ret;
3191 + }
3192 +#endif
3193 + return 0;
3194 +}
3195 +
3196 +static int tahvo_remove(struct device *dev)
3197 +{
3198 +#ifdef CONFIG_CBUS_TAHVO_USER
3199 + tahvo_user_cleanup();
3200 +#endif
3201 + /* Mask all TAHVO interrupts */
3202 + tahvo_write_reg(TAHVO_REG_IMR, 0xffff);
3203 + free_irq(gpio_to_irq(tahvo_irq_pin), 0);
3204 + gpio_free(tahvo_irq_pin);
3205 + tasklet_kill(&tahvo_tasklet);
3206 +
3207 + return 0;
3208 +}
3209 +
3210 +static void tahvo_device_release(struct device *dev)
3211 +{
3212 + complete(&device_release);
3213 +}
3214 +
3215 +static struct device_driver tahvo_driver = {
3216 + .name = "tahvo",
3217 + .bus = &platform_bus_type,
3218 + .probe = tahvo_probe,
3219 + .remove = tahvo_remove,
3220 +};
3221 +
3222 +static struct platform_device tahvo_device = {
3223 + .name = "tahvo",
3224 + .id = -1,
3225 + .dev = {
3226 + .release = tahvo_device_release,
3227 + }
3228 +};
3229 +
3230 +/**
3231 + * tahvo_init - initialise Tahvo driver
3232 + *
3233 + * Initialise the Tahvo driver and return 0 if everything worked ok
3234 + */
3235 +static int __init tahvo_init(void)
3236 +{
3237 + int ret = 0;
3238 +
3239 + printk(KERN_INFO "Tahvo/Betty driver initialising\n");
3240 +
3241 + init_completion(&device_release);
3242 +
3243 + if ((ret = driver_register(&tahvo_driver)) < 0)
3244 + return ret;
3245 +
3246 + if ((ret = platform_device_register(&tahvo_device)) < 0) {
3247 + driver_unregister(&tahvo_driver);
3248 + return ret;
3249 + }
3250 + return 0;
3251 +}
3252 +
3253 +/*
3254 + * Cleanup
3255 + */
3256 +static void __exit tahvo_exit(void)
3257 +{
3258 + platform_device_unregister(&tahvo_device);
3259 + driver_unregister(&tahvo_driver);
3260 + wait_for_completion(&device_release);
3261 +}
3262 +
3263 +EXPORT_SYMBOL(tahvo_request_irq);
3264 +EXPORT_SYMBOL(tahvo_free_irq);
3265 +EXPORT_SYMBOL(tahvo_enable_irq);
3266 +EXPORT_SYMBOL(tahvo_disable_irq);
3267 +EXPORT_SYMBOL(tahvo_ack_irq);
3268 +EXPORT_SYMBOL(tahvo_read_reg);
3269 +EXPORT_SYMBOL(tahvo_write_reg);
3270 +EXPORT_SYMBOL(tahvo_get_backlight_level);
3271 +EXPORT_SYMBOL(tahvo_get_max_backlight_level);
3272 +EXPORT_SYMBOL(tahvo_set_backlight_level);
3273 +
3274 +subsys_initcall(tahvo_init);
3275 +module_exit(tahvo_exit);
3276 +
3277 +MODULE_DESCRIPTION("Tahvo ASIC control");
3278 +MODULE_LICENSE("GPL");
3279 +MODULE_AUTHOR("Juha Yrjölä, David Weinehall, and Mikko Ylinen");
3280 Index: linux-2.6.37/drivers/cbus/tahvo.h
3281 ===================================================================
3282 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
3283 +++ linux-2.6.37/drivers/cbus/tahvo.h 2011-01-27 14:17:39.086000008 +0100
3284 @@ -0,0 +1,61 @@
3285 +/*
3286 + * drivers/cbus/tahvo.h
3287 + *
3288 + * Copyright (C) 2004, 2005 Nokia Corporation
3289 + *
3290 + * Written by Juha Yrjölä <juha.yrjola@nokia.com> and
3291 + * David Weinehall <david.weinehall@nokia.com>
3292 + *
3293 + * This file is subject to the terms and conditions of the GNU General
3294 + * Public License. See the file "COPYING" in the main directory of this
3295 + * archive for more details.
3296 + *
3297 + * This program is distributed in the hope that it will be useful,
3298 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3299 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3300 + * GNU General Public License for more details.
3301 +
3302 + * You should have received a copy of the GNU General Public License
3303 + * along with this program; if not, write to the Free Software
3304 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
3305 + */
3306 +
3307 +#ifndef __DRIVERS_CBUS_TAHVO_H
3308 +#define __DRIVERS_CBUS_TAHVO_H
3309 +
3310 +#include <linux/types.h>
3311 +
3312 +/* Registers */
3313 +#define TAHVO_REG_ASICR 0x00 /* ASIC ID & revision */
3314 +#define TAHVO_REG_IDR 0x01 /* Interrupt ID */
3315 +#define TAHVO_REG_IDSR 0x02 /* Interrupt status */
3316 +#define TAHVO_REG_IMR 0x03 /* Interrupt mask */
3317 +#define TAHVO_REG_LEDPWMR 0x05 /* LED PWM */
3318 +#define TAHVO_REG_USBR 0x06 /* USB control */
3319 +#define TAHVO_REG_MAX 0x0d
3320 +
3321 +/* Interrupt sources */
3322 +#define TAHVO_INT_VBUSON 0
3323 +
3324 +#define MAX_TAHVO_IRQ_HANDLERS 8
3325 +
3326 +int tahvo_read_reg(int reg);
3327 +void tahvo_write_reg(int reg, u16 val);
3328 +void tahvo_set_clear_reg_bits(int reg, u16 set, u16 clear);
3329 +int tahvo_request_irq(int id, void *irq_handler, unsigned long arg, char *name);
3330 +void tahvo_free_irq(int id);
3331 +void tahvo_enable_irq(int id);
3332 +void tahvo_disable_irq(int id);
3333 +void tahvo_ack_irq(int id);
3334 +int tahvo_get_backlight_level(void);
3335 +int tahvo_get_max_backlight_level(void);
3336 +void tahvo_set_backlight_level(int level);
3337 +
3338 +#ifdef CONFIG_CBUS_TAHVO_USER
3339 +int tahvo_user_init(void);
3340 +void tahvo_user_cleanup(void);
3341 +#endif
3342 +
3343 +extern spinlock_t tahvo_lock;
3344 +
3345 +#endif /* __DRIVERS_CBUS_TAHVO_H */
3346 Index: linux-2.6.37/drivers/cbus/tahvo-usb.c
3347 ===================================================================
3348 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
3349 +++ linux-2.6.37/drivers/cbus/tahvo-usb.c 2011-01-27 14:17:39.087000008 +0100
3350 @@ -0,0 +1,788 @@
3351 +/**
3352 + * drivers/cbus/tahvo-usb.c
3353 + *
3354 + * Tahvo USB transeiver
3355 + *
3356 + * Copyright (C) 2005-2006 Nokia Corporation
3357 + *
3358 + * Parts copied from drivers/i2c/chips/isp1301_omap.c
3359 + * Copyright (C) 2004 Texas Instruments
3360 + * Copyright (C) 2004 David Brownell
3361 + *
3362 + * Written by Juha Yrjölä <juha.yrjola@nokia.com>,
3363 + * Tony Lindgren <tony@atomide.com>, and
3364 + * Timo Teräs <timo.teras@nokia.com>
3365 + *
3366 + * This file is subject to the terms and conditions of the GNU General
3367 + * Public License. See the file "COPYING" in the main directory of this
3368 + * archive for more details.
3369 + *
3370 + * This program is distributed in the hope that it will be useful,
3371 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
3372 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3373 + * GNU General Public License for more details.
3374 + *
3375 + * You should have received a copy of the GNU General Public License
3376 + * along with this program; if not, write to the Free Software
3377 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
3378 + */
3379 +
3380 +#include <linux/kernel.h>
3381 +#include <linux/module.h>
3382 +#include <linux/init.h>
3383 +#include <linux/slab.h>
3384 +#include <linux/io.h>
3385 +#include <linux/interrupt.h>
3386 +#include <linux/platform_device.h>
3387 +#include <linux/usb/ch9.h>
3388 +#include <linux/usb/gadget.h>
3389 +#include <linux/usb.h>
3390 +#include <linux/usb/otg.h>
3391 +#include <linux/i2c.h>
3392 +#include <linux/workqueue.h>
3393 +#include <linux/kobject.h>
3394 +#include <linux/clk.h>
3395 +#include <linux/mutex.h>
3396 +
3397 +#include <asm/irq.h>
3398 +#include <plat/usb.h>
3399 +
3400 +#include "cbus.h"
3401 +#include "tahvo.h"
3402 +
3403 +#define DRIVER_NAME "tahvo-usb"
3404 +
3405 +#define USBR_SLAVE_CONTROL (1 << 8)
3406 +#define USBR_VPPVIO_SW (1 << 7)
3407 +#define USBR_SPEED (1 << 6)
3408 +#define USBR_REGOUT (1 << 5)
3409 +#define USBR_MASTER_SW2 (1 << 4)
3410 +#define USBR_MASTER_SW1 (1 << 3)
3411 +#define USBR_SLAVE_SW (1 << 2)
3412 +#define USBR_NSUSPEND (1 << 1)
3413 +#define USBR_SEMODE (1 << 0)
3414 +
3415 +/* bits in OTG_CTRL */
3416 +
3417 +/* Bits that are controlled by OMAP OTG and are read-only */
3418 +#define OTG_CTRL_OMAP_MASK (OTG_PULLDOWN|OTG_PULLUP|OTG_DRV_VBUS|\
3419 + OTG_PD_VBUS|OTG_PU_VBUS|OTG_PU_ID)
3420 +/* Bits that are controlled by transceiver */
3421 +#define OTG_CTRL_XCVR_MASK (OTG_ASESSVLD|OTG_BSESSEND|\
3422 + OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
3423 +/* Bits that are controlled by system */
3424 +#define OTG_CTRL_SYS_MASK (OTG_A_BUSREQ|OTG_A_SETB_HNPEN|OTG_B_BUSREQ|\
3425 + OTG_B_HNPEN|OTG_BUSDROP)
3426 +
3427 +#if defined(CONFIG_USB_OHCI_HCD) && !defined(CONFIG_USB_OTG)
3428 +#error tahvo-otg.c does not work with OCHI yet!
3429 +#endif
3430 +
3431 +#define TAHVO_MODE_HOST 0
3432 +#define TAHVO_MODE_PERIPHERAL 1
3433 +
3434 +#ifdef CONFIG_USB_OTG
3435 +#define TAHVO_MODE(tu) (tu)->tahvo_mode
3436 +#elif defined(CONFIG_USB_GADGET_OMAP)
3437 +#define TAHVO_MODE(tu) TAHVO_MODE_PERIPHERAL
3438 +#else
3439 +#define TAHVO_MODE(tu) TAHVO_MODE_HOST
3440 +#endif
3441 +
3442 +struct tahvo_usb {
3443 + struct platform_device *pt_dev;
3444 + struct otg_transceiver otg;
3445 + int vbus_state;
3446 + struct work_struct irq_work;
3447 + struct mutex serialize;
3448 +#ifdef CONFIG_USB_OTG
3449 + int tahvo_mode;
3450 +#endif
3451 +};
3452 +static struct platform_device tahvo_usb_device;
3453 +
3454 +/*
3455 + * ---------------------------------------------------------------------------
3456 + * OTG related functions
3457 + *
3458 + * These shoud be separated into omap-otg.c driver module, as they are used
3459 + * by various transceivers. These functions are needed in the UDC-only case
3460 + * as well. These functions are copied from GPL isp1301_omap.c
3461 + * ---------------------------------------------------------------------------
3462 + */
3463 +static struct platform_device *tahvo_otg_dev;
3464 +
3465 +static irqreturn_t omap_otg_irq(int irq, void *arg)
3466 +{
3467 + struct platform_device *otg_dev = arg;
3468 + struct tahvo_usb *tu = platform_get_drvdata(otg_dev);
3469 + u16 otg_irq;
3470 +
3471 + otg_irq = omap_readw(OTG_IRQ_SRC);
3472 + if (otg_irq & OPRT_CHG) {
3473 + omap_writew(OPRT_CHG, OTG_IRQ_SRC);
3474 + } else if (otg_irq & B_SRP_TMROUT) {
3475 + omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
3476 + } else if (otg_irq & B_HNP_FAIL) {
3477 + omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
3478 + } else if (otg_irq & A_SRP_DETECT) {
3479 + omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
3480 + } else if (otg_irq & A_REQ_TMROUT) {
3481 + omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
3482 + } else if (otg_irq & A_VBUS_ERR) {
3483 + omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
3484 + } else if (otg_irq & DRIVER_SWITCH) {
3485 + if ((!(omap_readl(OTG_CTRL) & OTG_DRIVER_SEL)) &&
3486 + tu->otg.host && tu->otg.state == OTG_STATE_A_HOST) {
3487 + /* role is host */
3488 + usb_bus_start_enum(tu->otg.host,
3489 + tu->otg.host->otg_port);
3490 + }
3491 + omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
3492 + } else
3493 + return IRQ_NONE;
3494 +
3495 + return IRQ_HANDLED;
3496 +
3497 +}
3498 +
3499 +static int tahvo_omap_otg_init(void)
3500 +{
3501 + u32 l;
3502 +
3503 +#ifdef CONFIG_USB_OTG
3504 + if (!tahvo_otg_dev) {
3505 + printk("tahvo-usb: no tahvo_otg_dev\n");
3506 + return -ENODEV;
3507 + }
3508 +#endif
3509 +
3510 + l = omap_readl(OTG_SYSCON_1);
3511 + l &= ~OTG_IDLE_EN;
3512 + omap_writel(l, OTG_SYSCON_1);
3513 + udelay(100);
3514 +
3515 + /* some of these values are board-specific... */
3516 + l = omap_readl(OTG_SYSCON_2);
3517 + l |= OTG_EN
3518 + /* for B-device: */
3519 + | SRP_GPDATA /* 9msec Bdev D+ pulse */
3520 + | SRP_GPDVBUS /* discharge after VBUS pulse */
3521 + // | (3 << 24) /* 2msec VBUS pulse */
3522 + /* for A-device: */
3523 + | (0 << 20) /* 200ms nominal A_WAIT_VRISE timer */
3524 + | SRP_DPW /* detect 167+ns SRP pulses */
3525 + | SRP_DATA | SRP_VBUS; /* accept both kinds of SRP pulse */
3526 + omap_writel(l, OTG_SYSCON_2);
3527 +
3528 + omap_writew(DRIVER_SWITCH | OPRT_CHG
3529 + | B_SRP_TMROUT | B_HNP_FAIL
3530 + | A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT,
3531 + OTG_IRQ_EN);
3532 + l = omap_readl(OTG_SYSCON_2);
3533 + l |= OTG_EN;
3534 + omap_writel(l, OTG_SYSCON_2);
3535 +
3536 + return 0;
3537 +}
3538 +
3539 +static int omap_otg_probe(struct platform_device *pdev)
3540 +{
3541 + int ret, err;
3542 +
3543 + tahvo_otg_dev = pdev;
3544 + ret = tahvo_omap_otg_init();
3545 + if (ret != 0) {
3546 + printk(KERN_ERR "tahvo-usb: omap_otg_init failed\n");
3547 + return ret;
3548 + }
3549 +
3550 + err = request_irq(tahvo_otg_dev->resource[1].start,
3551 + omap_otg_irq, IRQF_DISABLED, DRIVER_NAME,
3552 + &tahvo_usb_device);
3553 +
3554 + return err;
3555 +}
3556 +
3557 +static int omap_otg_remove(struct platform_device *pdev)
3558 +{
3559 + free_irq(tahvo_otg_dev->resource[1].start, &tahvo_usb_device);
3560 + tahvo_otg_dev = NULL;
3561 +
3562 + return 0;
3563 +}
3564 +
3565 +static struct platform_driver omap_otg_driver = {
3566 + .probe = omap_otg_probe,
3567 + .remove = omap_otg_remove,
3568 + .driver = {
3569 + .name = "omap_otg",
3570 + }
3571 +};
3572 +
3573 +/*
3574 + * ---------------------------------------------------------------------------
3575 + * Tahvo related functions
3576 + * These are Nokia proprietary code, except for the OTG register settings,
3577 + * which are copied from isp1301.c
3578 + * ---------------------------------------------------------------------------
3579 + */
3580 +static ssize_t vbus_state_show(struct device *device,
3581 + struct device_attribute *attr, char *buf)
3582 +{
3583 + struct platform_device *pdev = to_platform_device(device);
3584 + struct tahvo_usb *tu = platform_get_drvdata(pdev);
3585 + return sprintf(buf, "%d\n", tu->vbus_state);
3586 +}
3587 +static DEVICE_ATTR(vbus_state, 0444, vbus_state_show, NULL);
3588 +
3589 +int vbus_active = 0;
3590 +
3591 +#if 0
3592 +
3593 +static int host_suspend(struct tahvo_usb *tu)
3594 +{
3595 + struct device *dev;
3596 +
3597 + if (!tu->otg.host)
3598 + return -ENODEV;
3599 +
3600 + /* Currently ASSUMES only the OTG port matters;
3601 + * other ports could be active...
3602 + */
3603 + dev = tu->otg.host->controller;
3604 + return dev->driver->suspend(dev, PMSG_SUSPEND);
3605 +}
3606 +
3607 +static int host_resume(struct tahvo_usb *tu)
3608 +{
3609 + struct device *dev;
3610 +
3611 + if (!tu->otg.host)
3612 + return -ENODEV;
3613 +
3614 + dev = tu->otg.host->controller;
3615 + return dev->driver->resume(dev);
3616 +}
3617 +
3618 +#else
3619 +
3620 +static int host_suspend(struct tahvo_usb *tu)
3621 +{
3622 + return 0;
3623 +}
3624 +
3625 +static int host_resume(struct tahvo_usb *tu)
3626 +{
3627 + return 0;
3628 +}
3629 +
3630 +#endif
3631 +
3632 +static void check_vbus_state(struct tahvo_usb *tu)
3633 +{
3634 + int reg, prev_state;
3635 +
3636 + reg = tahvo_read_reg(TAHVO_REG_IDSR);
3637 + if (reg & 0x01) {
3638 + u32 l;
3639 +
3640 + vbus_active = 1;
3641 + switch (tu->otg.state) {
3642 + case OTG_STATE_B_IDLE:
3643 + /* Enable the gadget driver */
3644 + if (tu->otg.gadget)
3645 + usb_gadget_vbus_connect(tu->otg.gadget);
3646 + /* Set B-session valid and not B-sessio ended to indicate
3647 + * Vbus to be ok. */
3648 + l = omap_readl(OTG_CTRL);
3649 + l &= ~OTG_BSESSEND;
3650 + l |= OTG_BSESSVLD;
3651 + omap_writel(l, OTG_CTRL);
3652 +
3653 + tu->otg.state = OTG_STATE_B_PERIPHERAL;
3654 + break;
3655 + case OTG_STATE_A_IDLE:
3656 + /* Session is now valid assuming the USB hub is driving Vbus */
3657 + tu->otg.state = OTG_STATE_A_HOST;
3658 + host_resume(tu);
3659 + break;
3660 + default:
3661 + break;
3662 + }
3663 + printk("USB cable connected\n");
3664 + } else {
3665 + switch (tu->otg.state) {
3666 + case OTG_STATE_B_PERIPHERAL:
3667 + if (tu->otg.gadget)
3668 + usb_gadget_vbus_disconnect(tu->otg.gadget);
3669 + tu->otg.state = OTG_STATE_B_IDLE;
3670 + break;
3671 + case OTG_STATE_A_HOST:
3672 + tu->otg.state = OTG_STATE_A_IDLE;
3673 + break;
3674 + default:
3675 + break;
3676 + }
3677 + printk("USB cable disconnected\n");
3678 + vbus_active = 0;
3679 + }
3680 +
3681 + prev_state = tu->vbus_state;
3682 + tu->vbus_state = reg & 0x01;
3683 + if (prev_state != tu->vbus_state)
3684 + sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state");
3685 +}
3686 +
3687 +static void tahvo_usb_become_host(struct tahvo_usb *tu)
3688 +{
3689 + u32 l;
3690 +
3691 + /* Clear system and transceiver controlled bits
3692 + * also mark the A-session is always valid */
3693 + tahvo_omap_otg_init();
3694 +
3695 + l = omap_readl(OTG_CTRL);
3696 + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK);
3697 + l |= OTG_ASESSVLD;
3698 + omap_writel(l, OTG_CTRL);
3699 +
3700 + /* Power up the transceiver in USB host mode */
3701 + tahvo_write_reg(TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND |
3702 + USBR_MASTER_SW2 | USBR_MASTER_SW1);
3703 + tu->otg.state = OTG_STATE_A_IDLE;
3704 +
3705 + check_vbus_state(tu);
3706 +}
3707 +
3708 +static void tahvo_usb_stop_host(struct tahvo_usb *tu)
3709 +{
3710 + host_suspend(tu);
3711 + tu->otg.state = OTG_STATE_A_IDLE;
3712 +}
3713 +
3714 +static void tahvo_usb_become_peripheral(struct tahvo_usb *tu)
3715 +{
3716 + u32 l;
3717 +
3718 + /* Clear system and transceiver controlled bits
3719 + * and enable ID to mark peripheral mode and
3720 + * BSESSEND to mark no Vbus */
3721 + tahvo_omap_otg_init();
3722 + l = omap_readl(OTG_CTRL);
3723 + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD);
3724 + l |= OTG_ID | OTG_BSESSEND;
3725 + omap_writel(l, OTG_CTRL);
3726 +
3727 + /* Power up transceiver and set it in USB perhiperal mode */
3728 + tahvo_write_reg(TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT | USBR_NSUSPEND | USBR_SLAVE_SW);
3729 + tu->otg.state = OTG_STATE_B_IDLE;
3730 +
3731 + check_vbus_state(tu);
3732 +}
3733 +
3734 +static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu)
3735 +{
3736 + u32 l;
3737 +
3738 + l = omap_readl(OTG_CTRL);
3739 + l &= ~OTG_BSESSVLD;
3740 + l |= OTG_BSESSEND;
3741 + omap_writel(l, OTG_CTRL);
3742 +
3743 + if (tu->otg.gadget)
3744 + usb_gadget_vbus_disconnect(tu->otg.gadget);
3745 + tu->otg.state = OTG_STATE_B_IDLE;
3746 +
3747 +}
3748 +
3749 +static void tahvo_usb_power_off(struct tahvo_usb *tu)
3750 +{
3751 + u32 l;
3752 + int id;
3753 +
3754 + /* Disable gadget controller if any */
3755 + if (tu->otg.gadget)
3756 + usb_gadget_vbus_disconnect(tu->otg.gadget);
3757 +
3758 + host_suspend(tu);
3759 +
3760 + /* Disable OTG and interrupts */
3761 + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
3762 + id = OTG_ID;
3763 + else
3764 + id = 0;
3765 + l = omap_readl(OTG_CTRL);
3766 + l &= ~(OTG_CTRL_XCVR_MASK | OTG_CTRL_SYS_MASK | OTG_BSESSVLD);
3767 + l |= id | OTG_BSESSEND;
3768 + omap_writel(l, OTG_CTRL);
3769 + omap_writew(0, OTG_IRQ_EN);
3770 +
3771 + l = omap_readl(OTG_SYSCON_2);
3772 + l &= ~OTG_EN;
3773 + omap_writel(l, OTG_SYSCON_2);
3774 +
3775 + l = omap_readl(OTG_SYSCON_1);
3776 + l |= OTG_IDLE_EN;
3777 + omap_writel(l, OTG_SYSCON_1);
3778 +
3779 + /* Power off transceiver */
3780 + tahvo_write_reg(TAHVO_REG_USBR, 0);
3781 + tu->otg.state = OTG_STATE_UNDEFINED;
3782 +}
3783 +
3784 +
3785 +static int tahvo_usb_set_power(struct otg_transceiver *dev, unsigned mA)
3786 +{
3787 + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
3788 +
3789 + dev_dbg(&tu->pt_dev->dev, "set_power %d mA\n", mA);
3790 +
3791 + if (dev->state == OTG_STATE_B_PERIPHERAL) {
3792 + /* REVISIT: Can Tahvo charge battery from VBUS? */
3793 + }
3794 + return 0;
3795 +}
3796 +
3797 +static int tahvo_usb_set_suspend(struct otg_transceiver *dev, int suspend)
3798 +{
3799 + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
3800 + u16 w;
3801 +
3802 + dev_dbg(&tu->pt_dev->dev, "set_suspend\n");
3803 +
3804 + w = tahvo_read_reg(TAHVO_REG_USBR);
3805 + if (suspend)
3806 + w &= ~USBR_NSUSPEND;
3807 + else
3808 + w |= USBR_NSUSPEND;
3809 + tahvo_write_reg(TAHVO_REG_USBR, w);
3810 +
3811 + return 0;
3812 +}
3813 +
3814 +static int tahvo_usb_start_srp(struct otg_transceiver *dev)
3815 +{
3816 + struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, otg);
3817 + u32 otg_ctrl;
3818 +
3819 + dev_dbg(&tu->pt_dev->dev, "start_srp\n");
3820 +
3821 + if (!dev || tu->otg.state != OTG_STATE_B_IDLE)
3822 + return -ENODEV;
3823 +
3824 + otg_ctrl = omap_readl(OTG_CTRL);
3825 + if (!(otg_ctrl & OTG_BSESSEND))
3826 + return -EINVAL;
3827 +
3828 + otg_ctrl |= OTG_B_BUSREQ;
3829 + otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_SYS_MASK;
3830 + omap_writel(otg_ctrl, OTG_CTRL);
3831 + tu->otg.state = OTG_STATE_B_SRP_INIT;
3832 +
3833 + return 0;
3834 +}
3835 +
3836 +static int tahvo_usb_start_hnp(struct otg_transceiver *otg)
3837 +{
3838 + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
3839 +
3840 + dev_dbg(&tu->pt_dev->dev, "start_hnp\n");
3841 +#ifdef CONFIG_USB_OTG
3842 + /* REVISIT: Add this for OTG */
3843 +#endif
3844 + return -EINVAL;
3845 +}
3846 +
3847 +static int tahvo_usb_set_host(struct otg_transceiver *otg, struct usb_bus *host)
3848 +{
3849 + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
3850 + u32 l;
3851 +
3852 + dev_dbg(&tu->pt_dev->dev, "set_host %p\n", host);
3853 +
3854 + if (otg == NULL)
3855 + return -ENODEV;
3856 +
3857 +#if defined(CONFIG_USB_OTG) || !defined(CONFIG_USB_GADGET_OMAP)
3858 +
3859 + mutex_lock(&tu->serialize);
3860 +
3861 + if (host == NULL) {
3862 + if (TAHVO_MODE(tu) == TAHVO_MODE_HOST)
3863 + tahvo_usb_power_off(tu);
3864 + tu->otg.host = NULL;
3865 + mutex_unlock(&tu->serialize);
3866 + return 0;
3867 + }
3868 +
3869 + l = omap_readl(OTG_SYSCON_1);
3870 + l &= ~(OTG_IDLE_EN | HST_IDLE_EN | DEV_IDLE_EN);
3871 + omap_writel(l, OTG_SYSCON_1);
3872 +
3873 + if (TAHVO_MODE(tu) == TAHVO_MODE_HOST) {
3874 + tu->otg.host = NULL;
3875 + tahvo_usb_become_host(tu);
3876 + } else
3877 + host_suspend(tu);
3878 +
3879 + tu->otg.host = host;
3880 +
3881 + mutex_unlock(&tu->serialize);
3882 +#else
3883 + /* No host mode configured, so do not allow host controlled to be set */
3884 + return -EINVAL;
3885 +#endif
3886 +
3887 + return 0;
3888 +}
3889 +
3890 +static int tahvo_usb_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
3891 +{
3892 + struct tahvo_usb *tu = container_of(otg, struct tahvo_usb, otg);
3893 +
3894 + dev_dbg(&tu->pt_dev->dev, "set_peripheral %p\n", gadget);
3895 +
3896 + if (!otg)
3897 + return -ENODEV;
3898 +
3899 +#if defined(CONFIG_USB_OTG) || defined(CONFIG_USB_GADGET_OMAP)
3900 +
3901 + mutex_lock(&tu->serialize);
3902 +
3903 + if (!gadget) {
3904 + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
3905 + tahvo_usb_power_off(tu);
3906 + tu->otg.gadget = NULL;
3907 + mutex_unlock(&tu->serialize);
3908 + return 0;
3909 + }
3910 +
3911 + tu->otg.gadget = gadget;
3912 + if (TAHVO_MODE(tu) == TAHVO_MODE_PERIPHERAL)
3913 + tahvo_usb_become_peripheral(tu);
3914 +
3915 + mutex_unlock(&tu->serialize);
3916 +#else
3917 + /* No gadget mode configured, so do not allow host controlled to be set */
3918 + return -EINVAL;
3919 +#endif
3920 +
3921 + return 0;
3922 +}
3923 +
3924 +static void tahvo_usb_irq_work(struct work_struct *work)
3925 +{
3926 + struct tahvo_usb *tu = container_of(work, struct tahvo_usb, irq_work);
3927 +
3928 + mutex_lock(&tu->serialize);
3929 + check_vbus_state(tu);
3930 + mutex_unlock(&tu->serialize);
3931 +}
3932 +
3933 +static void tahvo_usb_vbus_interrupt(unsigned long arg)
3934 +{
3935 + struct tahvo_usb *tu = (struct tahvo_usb *) arg;
3936 +
3937 + tahvo_ack_irq(TAHVO_INT_VBUSON);
3938 + /* Seems we need this to acknowledge the interrupt */
3939 + tahvo_read_reg(TAHVO_REG_IDSR);
3940 + schedule_work(&tu->irq_work);
3941 +}
3942 +
3943 +#ifdef CONFIG_USB_OTG
3944 +static ssize_t otg_mode_show(struct device *device,
3945 + struct device_attribute *attr, char *buf)
3946 +{
3947 + struct platform_device *pdev = to_platform_device(device);
3948 + struct tahvo_usb *tu = platform_get_drvdata(pdev);
3949 +
3950 + switch (tu->tahvo_mode) {
3951 + case TAHVO_MODE_HOST:
3952 + return sprintf(buf, "host\n");
3953 + case TAHVO_MODE_PERIPHERAL:
3954 + return sprintf(buf, "peripheral\n");
3955 + }
3956 +
3957 + return sprintf(buf, "unknown\n");
3958 +}
3959 +
3960 +static ssize_t otg_mode_store(struct device *device,
3961 + struct device_attribute *attr,
3962 + const char *buf, size_t count)
3963 +{
3964 + struct platform_device *pdev = to_platform_device(device);
3965 + struct tahvo_usb *tu = platform_get_drvdata(pdev);
3966 + int r;
3967 +
3968 + r = strlen(buf);
3969 + mutex_lock(&tu->serialize);
3970 + if (strncmp(buf, "host", 4) == 0) {
3971 + if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
3972 + tahvo_usb_stop_peripheral(tu);
3973 + tu->tahvo_mode = TAHVO_MODE_HOST;
3974 + if (tu->otg.host) {
3975 + printk(KERN_INFO "Selected HOST mode: host controller present.\n");
3976 + tahvo_usb_become_host(tu);
3977 + } else {
3978 + printk(KERN_INFO "Selected HOST mode: no host controller, powering off.\n");
3979 + tahvo_usb_power_off(tu);
3980 + }
3981 + } else if (strncmp(buf, "peripheral", 10) == 0) {
3982 + if (tu->tahvo_mode == TAHVO_MODE_HOST)
3983 + tahvo_usb_stop_host(tu);
3984 + tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
3985 + if (tu->otg.gadget) {
3986 + printk(KERN_INFO "Selected PERIPHERAL mode: gadget driver present.\n");
3987 + tahvo_usb_become_peripheral(tu);
3988 + } else {
3989 + printk(KERN_INFO "Selected PERIPHERAL mode: no gadget driver, powering off.\n");
3990 + tahvo_usb_power_off(tu);
3991 + }
3992 + } else
3993 + r = -EINVAL;
3994 +
3995 + mutex_unlock(&tu->serialize);
3996 + return r;
3997 +}
3998 +
3999 +static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store);
4000 +#endif
4001 +
4002 +static int tahvo_usb_probe(struct platform_device *pdev)
4003 +{
4004 + struct tahvo_usb *tu;
4005 + int ret;
4006 +
4007 + dev_dbg(&pdev->dev, "probe\n");
4008 +
4009 + /* Create driver data */
4010 + tu = kmalloc(sizeof(*tu), GFP_KERNEL);
4011 + if (!tu)
4012 + return -ENOMEM;
4013 + memset(tu, 0, sizeof(*tu));
4014 + tu->pt_dev = pdev;
4015 +#ifdef CONFIG_USB_OTG
4016 + /* Default mode */
4017 +#ifdef CONFIG_CBUS_TAHVO_USB_HOST_BY_DEFAULT
4018 + tu->tahvo_mode = TAHVO_MODE_HOST;
4019 +#else
4020 + tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
4021 +#endif
4022 +#endif
4023 +
4024 + INIT_WORK(&tu->irq_work, tahvo_usb_irq_work);
4025 + mutex_init(&tu->serialize);
4026 +
4027 + /* Set initial state, so that we generate kevents only on
4028 + * state changes */
4029 + tu->vbus_state = tahvo_read_reg(TAHVO_REG_IDSR) & 0x01;
4030 +
4031 + /* We cannot enable interrupt until omap_udc is initialized */
4032 + ret = tahvo_request_irq(TAHVO_INT_VBUSON, tahvo_usb_vbus_interrupt,
4033 + (unsigned long) tu, "vbus_interrupt");
4034 + if (ret != 0) {
4035 + kfree(tu);
4036 + printk(KERN_ERR "Could not register Tahvo interrupt for VBUS\n");
4037 + return ret;
4038 + }
4039 +
4040 + /* Attributes */
4041 + ret = device_create_file(&pdev->dev, &dev_attr_vbus_state);
4042 +#ifdef CONFIG_USB_OTG
4043 + ret |= device_create_file(&pdev->dev, &dev_attr_otg_mode);
4044 +#endif
4045 + if (ret)
4046 + printk(KERN_ERR "attribute creation failed: %d\n", ret);
4047 +
4048 + /* Create OTG interface */
4049 + tahvo_usb_power_off(tu);
4050 + tu->otg.state = OTG_STATE_UNDEFINED;
4051 + tu->otg.label = DRIVER_NAME;
4052 + tu->otg.set_host = tahvo_usb_set_host;
4053 + tu->otg.set_peripheral = tahvo_usb_set_peripheral;
4054 + tu->otg.set_power = tahvo_usb_set_power;
4055 + tu->otg.set_suspend = tahvo_usb_set_suspend;
4056 + tu->otg.start_srp = tahvo_usb_start_srp;
4057 + tu->otg.start_hnp = tahvo_usb_start_hnp;
4058 +
4059 + ret = otg_set_transceiver(&tu->otg);
4060 + if (ret < 0) {
4061 + printk(KERN_ERR "Cannot register USB transceiver\n");
4062 + kfree(tu);
4063 + tahvo_free_irq(TAHVO_INT_VBUSON);
4064 + return ret;
4065 + }
4066 +
4067 + platform_set_drvdata(pdev, tu);
4068 +
4069 + /* Act upon current vbus state once at startup. A vbus state irq may or
4070 + * may not be generated in addition to this. */
4071 + schedule_work(&tu->irq_work);
4072 + return 0;
4073 +}
4074 +
4075 +static int tahvo_usb_remove(struct platform_device *pdev)
4076 +{
4077 + dev_dbg(&pdev->dev, "remove\n");
4078 +
4079 + tahvo_free_irq(TAHVO_INT_VBUSON);
4080 + flush_scheduled_work();
4081 + otg_set_transceiver(0);
4082 + device_remove_file(&pdev->dev, &dev_attr_vbus_state);
4083 +#ifdef CONFIG_USB_OTG
4084 + device_remove_file(&pdev->dev, &dev_attr_otg_mode);
4085 +#endif
4086 + return 0;
4087 +}
4088 +
4089 +static struct platform_driver tahvo_usb_driver = {
4090 + .probe = tahvo_usb_probe,
4091 + .remove = tahvo_usb_remove,
4092 + .driver = {
4093 + .name = "tahvo-usb",
4094 + }
4095 +};
4096 +
4097 +static struct platform_device tahvo_usb_device = {
4098 + .name = "tahvo-usb",
4099 + .id = -1,
4100 +};
4101 +
4102 +static int __init tahvo_usb_init(void)
4103 +{
4104 + int ret = 0;
4105 +
4106 + printk(KERN_INFO "Tahvo USB transceiver driver initializing\n");
4107 +
4108 + ret = platform_driver_register(&tahvo_usb_driver);
4109 + if (ret)
4110 + return ret;
4111 + ret = platform_driver_register(&omap_otg_driver);
4112 + if (ret) {
4113 + platform_driver_unregister(&tahvo_usb_driver);
4114 + return ret;
4115 + }
4116 +
4117 + ret = platform_device_register(&tahvo_usb_device);
4118 + if (ret) {
4119 + platform_driver_unregister(&omap_otg_driver);
4120 + platform_driver_unregister(&tahvo_usb_driver);
4121 + return ret;
4122 + }
4123 +
4124 + return 0;
4125 +}
4126 +subsys_initcall(tahvo_usb_init);
4127 +
4128 +static void __exit tahvo_usb_exit(void)
4129 +{
4130 + platform_device_unregister(&tahvo_usb_device);
4131 + platform_driver_unregister(&omap_otg_driver);
4132 + platform_driver_unregister(&tahvo_usb_driver);
4133 +}
4134 +module_exit(tahvo_usb_exit);
4135 +
4136 +MODULE_DESCRIPTION("Tahvo USB OTG Transceiver Driver");
4137 +MODULE_LICENSE("GPL");
4138 +MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
4139 Index: linux-2.6.37/drivers/cbus/tahvo-user.c
4140 ===================================================================
4141 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
4142 +++ linux-2.6.37/drivers/cbus/tahvo-user.c 2011-01-27 14:17:39.087000008 +0100
4143 @@ -0,0 +1,406 @@
4144 +/**
4145 + * drivers/cbus/tahvo-user.c
4146 + *
4147 + * Tahvo user space interface functions
4148 + *
4149 + * Copyright (C) 2004, 2005 Nokia Corporation
4150 + *
4151 + * Written by Mikko Ylinen <mikko.k.ylinen@nokia.com>
4152 + *
4153 + * This file is subject to the terms and conditions of the GNU General
4154 + * Public License. See the file "COPYING" in the main directory of this
4155 + * archive for more details.
4156 + *
4157 + * This program is distributed in the hope that it will be useful,
4158 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4159 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4160 + * GNU General Public License for more details.
4161 + *
4162 + * You should have received a copy of the GNU General Public License
4163 + * along with this program; if not, write to the Free Software
4164 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
4165 + */
4166 +
4167 +#include <linux/types.h>
4168 +#include <linux/kernel.h>
4169 +#include <linux/interrupt.h>
4170 +#include <linux/module.h>
4171 +#include <linux/init.h>
4172 +#include <linux/fs.h>
4173 +#include <linux/miscdevice.h>
4174 +#include <linux/poll.h>
4175 +#include <linux/list.h>
4176 +#include <linux/spinlock.h>
4177 +#include <linux/sched.h>
4178 +#include <linux/mutex.h>
4179 +#include <linux/slab.h>
4180 +
4181 +#include <asm/uaccess.h>
4182 +
4183 +#include "tahvo.h"
4184 +
4185 +#include "user_retu_tahvo.h"
4186 +
4187 +/* Maximum size of IRQ node buffer/pool */
4188 +#define TAHVO_MAX_IRQ_BUF_LEN 16
4189 +
4190 +#define PFX "tahvo-user: "
4191 +
4192 +/* Bitmap for marking the interrupt sources as having the handlers */
4193 +static u32 tahvo_irq_bits;
4194 +
4195 +/* For allowing only one user process to subscribe to the tahvo interrupts */
4196 +static struct file *tahvo_irq_subscr = NULL;
4197 +
4198 +/* For poll and IRQ passing */
4199 +struct tahvo_irq {
4200 + u32 id;
4201 + struct list_head node;
4202 +};
4203 +
4204 +static spinlock_t tahvo_irqs_lock;
4205 +static struct tahvo_irq *tahvo_irq_block;
4206 +static LIST_HEAD(tahvo_irqs);
4207 +static LIST_HEAD(tahvo_irqs_reserve);
4208 +
4209 +/* Wait queue - used when user wants to read the device */
4210 +DECLARE_WAIT_QUEUE_HEAD(tahvo_user_waitqueue);
4211 +
4212 +/* Semaphore to protect irq subscription sequence */
4213 +static struct mutex tahvo_mutex;
4214 +
4215 +/* This array specifies TAHVO register types (read/write/toggle) */
4216 +static const u8 tahvo_access_bits[] = {
4217 + 1,
4218 + 4,
4219 + 1,
4220 + 3,
4221 + 3,
4222 + 3,
4223 + 3,
4224 + 3,
4225 + 3,
4226 + 3,
4227 + 3,
4228 + 3,
4229 + 3,
4230 + 1
4231 +};
4232 +
4233 +/*
4234 + * The handler for all TAHVO interrupts.
4235 + *
4236 + * arg is the interrupt source in TAHVO.
4237 + */
4238 +static void tahvo_user_irq_handler(unsigned long arg)
4239 +{
4240 + struct tahvo_irq *irq;
4241 +
4242 + /* user has to re-enable the interrupt once ready
4243 + * for receiving them again */
4244 + tahvo_disable_irq(arg);
4245 + tahvo_ack_irq(arg);
4246 +
4247 + spin_lock(&tahvo_irqs_lock);
4248 + if (list_empty(&tahvo_irqs_reserve)) {
4249 + spin_unlock(&tahvo_irqs_lock);
4250 + return;
4251 + }
4252 + irq = list_entry((&tahvo_irqs_reserve)->next, struct tahvo_irq, node);
4253 + irq->id = arg;
4254 + list_move_tail(&irq->node, &tahvo_irqs);
4255 + spin_unlock(&tahvo_irqs_lock);
4256 +
4257 + /* wake up waiting thread */
4258 + wake_up(&tahvo_user_waitqueue);
4259 +}
4260 +
4261 +/*
4262 + * This routine sets up the interrupt handler and marks an interrupt source
4263 + * in TAHVO as a candidate for signal delivery to the user process.
4264 + */
4265 +static int tahvo_user_subscribe_to_irq(int id, struct file *filp)
4266 +{
4267 + int ret;
4268 +
4269 + mutex_lock(&tahvo_mutex);
4270 + if ((tahvo_irq_subscr != NULL) && (tahvo_irq_subscr != filp)) {
4271 + mutex_unlock(&tahvo_mutex);
4272 + return -EBUSY;
4273 + }
4274 + /* Store the file pointer of the first user process registering IRQs */
4275 + tahvo_irq_subscr = filp;
4276 + mutex_unlock(&tahvo_mutex);
4277 +
4278 + if (tahvo_irq_bits & (1 << id))
4279 + return 0;
4280 +
4281 + ret = tahvo_request_irq(id, tahvo_user_irq_handler, id, "");
4282 + if (ret < 0)
4283 + return ret;
4284 +
4285 + /* Mark that this interrupt has a handler */
4286 + tahvo_irq_bits |= 1 << id;
4287 +
4288 + return 0;
4289 +}
4290 +
4291 +/*
4292 + * Unregister all TAHVO interrupt handlers
4293 + */
4294 +static void tahvo_unreg_irq_handlers(void)
4295 +{
4296 + int id;
4297 +
4298 + if (!tahvo_irq_bits)
4299 + return;
4300 +
4301 + for (id = 0; id < MAX_TAHVO_IRQ_HANDLERS; id++)
4302 + if (tahvo_irq_bits & (1 << id))
4303 + tahvo_free_irq(id);
4304 +
4305 + tahvo_irq_bits = 0;
4306 +}
4307 +
4308 +/*
4309 + * Write to TAHVO register.
4310 + * Returns 0 upon success, a negative error value otherwise.
4311 + */
4312 +static int tahvo_user_write_with_mask(u32 field, u16 value)
4313 +{
4314 + u32 mask;
4315 + u32 reg;
4316 + u_short tmp;
4317 + unsigned long flags;
4318 +
4319 + mask = MASK(field);
4320 + reg = REG(field);
4321 +
4322 + /* Detect bad mask and reg */
4323 + if (mask == 0 || reg > TAHVO_REG_MAX ||
4324 + tahvo_access_bits[reg] == READ_ONLY) {
4325 + printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
4326 + reg, mask);
4327 + return -EINVAL;
4328 + }
4329 +
4330 + /* Justify value according to mask */
4331 + while (!(mask & 1)) {
4332 + value = value << 1;
4333 + mask = mask >> 1;
4334 + }
4335 +
4336 + spin_lock_irqsave(&tahvo_lock, flags);
4337 + if (tahvo_access_bits[reg] == TOGGLE) {
4338 + /* No need to detect previous content of register */
4339 + tmp = 0;
4340 + } else {
4341 + /* Read current value of register */
4342 + tmp = tahvo_read_reg(reg);
4343 + }
4344 + /* Generate a new value */
4345 + tmp = (tmp & ~MASK(field)) | (value & MASK(field));
4346 + /* Write data to TAHVO */
4347 + tahvo_write_reg(reg, tmp);
4348 + spin_unlock_irqrestore(&tahvo_lock, flags);
4349 +
4350 + return 0;
4351 +}
4352 +
4353 +/*
4354 + * Read TAHVO register.
4355 + */
4356 +static u32 tahvo_user_read_with_mask(u32 field)
4357 +{
4358 + u_short value;
4359 + u32 mask, reg;
4360 +
4361 + mask = MASK(field);
4362 + reg = REG(field);
4363 +
4364 + /* Detect bad mask and reg */
4365 + if (mask == 0 || reg > TAHVO_REG_MAX) {
4366 + printk(KERN_ERR PFX "invalid arguments (reg=%#x, mask=%#x)\n",
4367 + reg, mask);
4368 + return -EINVAL;
4369 + }
4370 +
4371 + /* Read the register */
4372 + value = tahvo_read_reg(reg) & mask;
4373 +
4374 + /* Right justify value */
4375 + while (!(mask & 1)) {
4376 + value = value >> 1;
4377 + mask = mask >> 1;
4378 + }
4379 +
4380 + return value;
4381 +}
4382 +
4383 +/*
4384 + * Close device
4385 + */
4386 +static int tahvo_close(struct inode *inode, struct file *filp)
4387 +{
4388 + /* Unregister all interrupts that have been registered */
4389 + if (tahvo_irq_subscr == filp) {
4390 + tahvo_unreg_irq_handlers();
4391 + tahvo_irq_subscr = NULL;
4392 + }
4393 +
4394 + return 0;
4395 +}
4396 +
4397 +/*
4398 + * Device control (ioctl)
4399 + */
4400 +static long tahvo_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
4401 +{
4402 + struct retu_tahvo_write_parms par;
4403 + int ret;
4404 +
4405 + switch (cmd) {
4406 + case URT_IOCT_IRQ_SUBSCR:
4407 + return tahvo_user_subscribe_to_irq(arg, filp);
4408 + case TAHVO_IOCH_READ:
4409 + return tahvo_user_read_with_mask(arg);
4410 + case TAHVO_IOCX_WRITE:
4411 + ret = copy_from_user(&par, (void __user *) arg, sizeof(par));
4412 + if (ret)
4413 + printk(KERN_ERR "copy_from_user failed: %d\n", ret);
4414 + par.result = tahvo_user_write_with_mask(par.field, par.value);
4415 + ret = copy_to_user((void __user *) arg, &par, sizeof(par));
4416 + if (ret)
4417 + printk(KERN_ERR "copy_to_user failed: %d\n", ret);
4418 + break;
4419 + default:
4420 + return -ENOIOCTLCMD;
4421 + }
4422 + return 0;
4423 +}
4424 +
4425 +/*
4426 + * Read from device
4427 + */
4428 +static ssize_t tahvo_read(struct file *filp, char *buf, size_t count,
4429 + loff_t * offp)
4430 +{
4431 + struct tahvo_irq *irq;
4432 +
4433 + u32 nr, i;
4434 +
4435 + /* read not permitted if neither filp nor anyone has registered IRQs */
4436 + if (tahvo_irq_subscr != filp)
4437 + return -EPERM;
4438 +
4439 + if ((count < sizeof(u32)) || ((count % sizeof(u32)) != 0))
4440 + return -EINVAL;
4441 +
4442 + nr = count / sizeof(u32);
4443 +
4444 + for (i = 0; i < nr; i++) {
4445 + unsigned long flags;
4446 + u32 irq_id;
4447 + int ret;
4448 +
4449 + ret = wait_event_interruptible(tahvo_user_waitqueue,
4450 + !list_empty(&tahvo_irqs));
4451 + if (ret < 0)
4452 + return ret;
4453 +
4454 + spin_lock_irqsave(&tahvo_irqs_lock, flags);
4455 + irq = list_entry((&tahvo_irqs)->next, struct tahvo_irq, node);
4456 + irq_id = irq->id;
4457 + list_move(&irq->node, &tahvo_irqs_reserve);
4458 + spin_unlock_irqrestore(&tahvo_irqs_lock, flags);
4459 +
4460 + ret = copy_to_user(buf + i * sizeof(irq_id), &irq_id,
4461 + sizeof(irq_id));
4462 + if (ret)
4463 + printk(KERN_ERR "copy_to_user failed: %d\n", ret);
4464 + }
4465 +
4466 + return count;
4467 +}
4468 +
4469 +/*
4470 + * Poll method
4471 + */
4472 +static unsigned tahvo_poll(struct file *filp, struct poll_table_struct *pt)
4473 +{
4474 + if (!list_empty(&tahvo_irqs))
4475 + return POLLIN;
4476 +
4477 + poll_wait(filp, &tahvo_user_waitqueue, pt);
4478 +
4479 + if (!list_empty(&tahvo_irqs))
4480 + return POLLIN;
4481 + else
4482 + return 0;
4483 +}
4484 +
4485 +static struct file_operations tahvo_user_fileops = {
4486 + .owner = THIS_MODULE,
4487 + .unlocked_ioctl = tahvo_ioctl,
4488 + .read = tahvo_read,
4489 + .release = tahvo_close,
4490 + .poll = tahvo_poll
4491 +};
4492 +
4493 +static struct miscdevice tahvo_device = {
4494 + .minor = MISC_DYNAMIC_MINOR,
4495 + .name = "tahvo",
4496 + .fops = &tahvo_user_fileops
4497 +};
4498 +
4499 +/*
4500 + * Initialization
4501 + *
4502 + * @return 0 if successful, error value otherwise.
4503 + */
4504 +int tahvo_user_init(void)
4505 +{
4506 + struct tahvo_irq *irq;
4507 + int res, i;
4508 +
4509 + irq = kmalloc(sizeof(*irq) * TAHVO_MAX_IRQ_BUF_LEN, GFP_KERNEL);
4510 + if (irq == NULL) {
4511 + printk(KERN_ERR PFX "kmalloc failed\n");
4512 + return -ENOMEM;
4513 + }
4514 + memset(irq, 0, sizeof(*irq) * TAHVO_MAX_IRQ_BUF_LEN);
4515 + for (i = 0; i < TAHVO_MAX_IRQ_BUF_LEN; i++)
4516 + list_add(&irq[i].node, &tahvo_irqs_reserve);
4517 +
4518 + tahvo_irq_block = irq;
4519 +
4520 + spin_lock_init(&tahvo_irqs_lock);
4521 + mutex_init(&tahvo_mutex);
4522 +
4523 + /* Request a misc device */
4524 + res = misc_register(&tahvo_device);
4525 + if (res < 0) {
4526 + printk(KERN_ERR PFX "unable to register misc device for %s\n",
4527 + tahvo_device.name);
4528 + kfree(irq);
4529 + return res;
4530 + }
4531 +
4532 + return 0;
4533 +}
4534 +
4535 +/*
4536 + * Cleanup.
4537 + */
4538 +void tahvo_user_cleanup(void)
4539 +{
4540 + /* Unregister our misc device */
4541 + misc_deregister(&tahvo_device);
4542 + /* Unregister and disable all TAHVO interrupts */
4543 + tahvo_unreg_irq_handlers();
4544 + kfree(tahvo_irq_block);
4545 +}
4546 +
4547 +MODULE_DESCRIPTION("Tahvo ASIC user space functions");
4548 +MODULE_LICENSE("GPL");
4549 +MODULE_AUTHOR("Mikko Ylinen");
4550 Index: linux-2.6.37/drivers/cbus/user_retu_tahvo.h
4551 ===================================================================
4552 --- /dev/null 1970-01-01 00:00:00.000000000 +0000
4553 +++ linux-2.6.37/drivers/cbus/user_retu_tahvo.h 2011-01-27 14:17:39.087000008 +0100
4554 @@ -0,0 +1,75 @@
4555 +/**
4556 + * drivers/cbus/user_retu_tahvo.h
4557 + *
4558 + * Copyright (C) 2004, 2005 Nokia Corporation
4559 + *
4560 + * Written by Mikko Ylinen <mikko.k.ylinen@nokia.com>
4561 + *
4562 + * Definitions and types used by both retu-user and tahvo-user.
4563 + *
4564 + * This file is subject to the terms and conditions of the GNU General
4565 + * Public License. See the file "COPYING" in the main directory of this
4566 + * archive for more details.
4567 + *
4568 + * This program is distributed in the hope that it will be useful,
4569 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
4570 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4571 + * GNU General Public License for more details.
4572 +
4573 + * You should have received a copy of the GNU General Public License
4574 + * along with this program; if not, write to the Free Software
4575 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
4576 + */
4577 +
4578 +#ifndef _USER_RETU_TAHVO_H
4579 +#define _USER_RETU_TAHVO_H
4580 +
4581 +/* Chip IDs */
4582 +#define CHIP_RETU 1
4583 +#define CHIP_TAHVO 2
4584 +
4585 +/* Register access type bits */
4586 +#define READ_ONLY 1
4587 +#define WRITE_ONLY 2
4588 +#define READ_WRITE 3
4589 +#define TOGGLE 4
4590 +
4591 +#define MASK(field) ((u16)(field & 0xFFFF))
4592 +#define REG(field) ((u16)((field >> 16) & 0x3F))
4593 +
4594 +/*** IOCTL definitions. These should be kept in sync with user space **********/
4595 +
4596 +#define URT_IOC_MAGIC '`'
4597 +
4598 +/*
4599 + * IOCTL function naming conventions:
4600 + * ==================================
4601 + * 0 -- No argument and return value
4602 + * S -- Set through a pointer
4603 + * T -- Tell directly with the argument value
4604 + * G -- Reply by setting through a pointer
4605 + * Q -- response is on the return value
4606 + * X -- S and G atomically
4607 + * H -- T and Q atomically
4608 + */
4609 +
4610 +/* General */
4611 +#define URT_IOCT_IRQ_SUBSCR _IO(URT_IOC_MAGIC, 0)
4612 +
4613 +/* RETU */
4614 +#define RETU_IOCH_READ _IO(URT_IOC_MAGIC, 1)
4615 +#define RETU_IOCX_WRITE _IO(URT_IOC_MAGIC, 2)
4616 +#define RETU_IOCH_ADC_READ _IO(URT_IOC_MAGIC, 3)
4617 +
4618 +/* TAHVO */
4619 +#define TAHVO_IOCH_READ _IO(URT_IOC_MAGIC, 4)
4620 +#define TAHVO_IOCX_WRITE _IO(URT_IOC_MAGIC, 5)
4621 +
4622 +/* This structure is used for writing RETU/TAHVO registers */
4623 +struct retu_tahvo_write_parms {
4624 + u32 field;
4625 + u16 value;
4626 + u8 result;
4627 +};
4628 +
4629 +#endif
4630 Index: linux-2.6.37/drivers/Makefile
4631 ===================================================================
4632 --- linux-2.6.37.orig/drivers/Makefile 2011-01-27 14:17:04.232000007 +0100
4633 +++ linux-2.6.37/drivers/Makefile 2011-01-27 14:17:39.087000008 +0100
4634 @@ -74,7 +74,7 @@
4635 obj-$(CONFIG_INPUT) += input/
4636 obj-$(CONFIG_I2O) += message/
4637 obj-$(CONFIG_RTC_LIB) += rtc/
4638 -obj-y += i2c/ media/
4639 +obj-y += i2c/ media/ cbus/
4640 obj-$(CONFIG_PPS) += pps/
4641 obj-$(CONFIG_W1) += w1/
4642 obj-$(CONFIG_POWER_SUPPLY) += power/
4643 Index: linux-2.6.37/arch/arm/Kconfig
4644 ===================================================================
4645 --- linux-2.6.37.orig/arch/arm/Kconfig 2011-01-27 14:17:04.178000007 +0100
4646 +++ linux-2.6.37/arch/arm/Kconfig 2011-01-27 14:17:39.087000008 +0100
4647 @@ -1850,6 +1850,10 @@
4648
4649 source "drivers/Kconfig"
4650
4651 +if ARCH_OMAP
4652 +source "drivers/cbus/Kconfig"
4653 +endif
4654 +
4655 source "fs/Kconfig"
4656
4657 source "arch/arm/Kconfig.debug"
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