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[ar71xx] preliminary support for the Ubiquiti RouterStation Pro
[openwrt.git] / target / linux / s3c24xx / patches-2.6.24 / 1012-gta01-jbt6k74.patch.patch
1 From 6887823c9ab409a15ea73bda8a8b0523cebbe444 Mon Sep 17 00:00:00 2001
2 From: mokopatches <mokopatches@openmoko.org>
3 Date: Fri, 4 Apr 2008 11:31:13 +0100
4 Subject: [PATCH] gta01-jbt6k74.patch
5 This driver adds support for the SPI-based control interface of the LCM (LCD
6 Panel) found on the FIC GTA01 hardware.
7
8 The specific panel in this hardware is a TPO TD028TTEC1, but the driver should
9 be able to drive any other diplay based on the JBT6K74-AS controller ASIC.
10
11 Signed-off-by: Harald Welte <laforge@openmoko.org>
12 ---
13 arch/arm/mach-s3c2410/Kconfig | 1 +
14 drivers/video/display/Kconfig | 11 +
15 drivers/video/display/Makefile | 1 +
16 drivers/video/display/jbt6k74.c | 678 +++++++++++++++++++++++++++++++++++++++
17 4 files changed, 691 insertions(+), 0 deletions(-)
18 create mode 100644 drivers/video/display/jbt6k74.c
19
20 diff --git a/arch/arm/mach-s3c2410/Kconfig b/arch/arm/mach-s3c2410/Kconfig
21 index a2acd65..ff339e1 100644
22 --- a/arch/arm/mach-s3c2410/Kconfig
23 +++ b/arch/arm/mach-s3c2410/Kconfig
24 @@ -107,6 +107,7 @@ config MACH_VR1000
25 config MACH_QT2410
26 bool "QT2410"
27 select CPU_S3C2410
28 + select DISPLAY_JBT6K74
29 help
30 Say Y here if you are using the Armzone QT2410
31
32 diff --git a/drivers/video/display/Kconfig b/drivers/video/display/Kconfig
33 index f99af93..f0da483 100644
34 --- a/drivers/video/display/Kconfig
35 +++ b/drivers/video/display/Kconfig
36 @@ -21,4 +21,15 @@ config DISPLAY_SUPPORT
37 comment "Display hardware drivers"
38 depends on DISPLAY_SUPPORT
39
40 +config DISPLAY_JBT6K74
41 + tristate "TPO JBT6K74-AS TFT display ASIC control interface"
42 + depends on SPI_MASTER && SYSFS
43 + help
44 + SPI driver for the control interface of TFT panels containing
45 + the TPO JBT6K74-AS controller ASIC, such as the TPO TD028TTEC1
46 + TFT diplay module used in the FIC/OpenMoko Neo1973 GSM phones.
47 +
48 + The control interface is required for display operation, as it
49 + controls power management, display timing and gamma calibration.
50 +
51 endmenu
52 diff --git a/drivers/video/display/Makefile b/drivers/video/display/Makefile
53 index c0ea832..011b69d 100644
54 --- a/drivers/video/display/Makefile
55 +++ b/drivers/video/display/Makefile
56 @@ -3,4 +3,5 @@
57 display-objs := display-sysfs.o
58
59 obj-$(CONFIG_DISPLAY_SUPPORT) += display.o
60 +obj-$(CONFIG_DISPLAY_JBT6K74) += jbt6k74.o
61
62 diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c
63 new file mode 100644
64 index 0000000..d021d7e
65 --- /dev/null
66 +++ b/drivers/video/display/jbt6k74.c
67 @@ -0,0 +1,678 @@
68 +/* Linux kernel driver for the tpo JBT6K74-AS LCM ASIC
69 + *
70 + * Copyright (C) 2006-2007 by OpenMoko, Inc.
71 + * Author: Harald Welte <laforge@openmoko.org>,
72 + * Stefan Schmidt <stefan@openmoko.org>
73 + * All rights reserved.
74 + *
75 + * This program is free software; you can redistribute it and/or
76 + * modify it under the terms of the GNU General Public License as
77 + * published by the Free Software Foundation; either version 2 of
78 + * the License, or (at your option) any later version.
79 + *
80 + * This program is distributed in the hope that it will be useful,
81 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
82 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
83 + * GNU General Public License for more details.
84 + *
85 + * You should have received a copy of the GNU General Public License
86 + * along with this program; if not, write to the Free Software
87 + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
88 + * MA 02111-1307 USA
89 + *
90 + */
91 +#include <linux/kernel.h>
92 +#include <linux/types.h>
93 +#include <linux/module.h>
94 +#include <linux/device.h>
95 +#include <linux/platform_device.h>
96 +#include <linux/delay.h>
97 +
98 +#include <linux/spi/spi.h>
99 +
100 +enum jbt_register {
101 + JBT_REG_SLEEP_IN = 0x10,
102 + JBT_REG_SLEEP_OUT = 0x11,
103 +
104 + JBT_REG_DISPLAY_OFF = 0x28,
105 + JBT_REG_DISPLAY_ON = 0x29,
106 +
107 + JBT_REG_RGB_FORMAT = 0x3a,
108 + JBT_REG_QUAD_RATE = 0x3b,
109 +
110 + JBT_REG_POWER_ON_OFF = 0xb0,
111 + JBT_REG_BOOSTER_OP = 0xb1,
112 + JBT_REG_BOOSTER_MODE = 0xb2,
113 + JBT_REG_BOOSTER_FREQ = 0xb3,
114 + JBT_REG_OPAMP_SYSCLK = 0xb4,
115 + JBT_REG_VSC_VOLTAGE = 0xb5,
116 + JBT_REG_VCOM_VOLTAGE = 0xb6,
117 + JBT_REG_EXT_DISPL = 0xb7,
118 + JBT_REG_OUTPUT_CONTROL = 0xb8,
119 + JBT_REG_DCCLK_DCEV = 0xb9,
120 + JBT_REG_DISPLAY_MODE1 = 0xba,
121 + JBT_REG_DISPLAY_MODE2 = 0xbb,
122 + JBT_REG_DISPLAY_MODE = 0xbc,
123 + JBT_REG_ASW_SLEW = 0xbd,
124 + JBT_REG_DUMMY_DISPLAY = 0xbe,
125 + JBT_REG_DRIVE_SYSTEM = 0xbf,
126 +
127 + JBT_REG_SLEEP_OUT_FR_A = 0xc0,
128 + JBT_REG_SLEEP_OUT_FR_B = 0xc1,
129 + JBT_REG_SLEEP_OUT_FR_C = 0xc2,
130 + JBT_REG_SLEEP_IN_LCCNT_D = 0xc3,
131 + JBT_REG_SLEEP_IN_LCCNT_E = 0xc4,
132 + JBT_REG_SLEEP_IN_LCCNT_F = 0xc5,
133 + JBT_REG_SLEEP_IN_LCCNT_G = 0xc6,
134 +
135 + JBT_REG_GAMMA1_FINE_1 = 0xc7,
136 + JBT_REG_GAMMA1_FINE_2 = 0xc8,
137 + JBT_REG_GAMMA1_INCLINATION = 0xc9,
138 + JBT_REG_GAMMA1_BLUE_OFFSET = 0xca,
139 +
140 + /* VGA */
141 + JBT_REG_BLANK_CONTROL = 0xcf,
142 + JBT_REG_BLANK_TH_TV = 0xd0,
143 + JBT_REG_CKV_ON_OFF = 0xd1,
144 + JBT_REG_CKV_1_2 = 0xd2,
145 + JBT_REG_OEV_TIMING = 0xd3,
146 + JBT_REG_ASW_TIMING_1 = 0xd4,
147 + JBT_REG_ASW_TIMING_2 = 0xd5,
148 +
149 + /* QVGA */
150 + JBT_REG_BLANK_CONTROL_QVGA = 0xd6,
151 + JBT_REG_BLANK_TH_TV_QVGA = 0xd7,
152 + JBT_REG_CKV_ON_OFF_QVGA = 0xd8,
153 + JBT_REG_CKV_1_2_QVGA = 0xd9,
154 + JBT_REG_OEV_TIMING_QVGA = 0xde,
155 + JBT_REG_ASW_TIMING_1_QVGA = 0xdf,
156 + JBT_REG_ASW_TIMING_2_QVGA = 0xe0,
157 +
158 +
159 + JBT_REG_HCLOCK_VGA = 0xec,
160 + JBT_REG_HCLOCK_QVGA = 0xed,
161 +
162 +};
163 +
164 +enum jbt_state {
165 + JBT_STATE_DEEP_STANDBY,
166 + JBT_STATE_SLEEP,
167 + JBT_STATE_NORMAL,
168 + JBT_STATE_QVGA_NORMAL,
169 +};
170 +
171 +static const char *jbt_state_names[] = {
172 + [JBT_STATE_DEEP_STANDBY] = "deep-standby",
173 + [JBT_STATE_SLEEP] = "sleep",
174 + [JBT_STATE_NORMAL] = "normal",
175 + [JBT_STATE_QVGA_NORMAL] = "qvga-normal",
176 +};
177 +
178 +struct jbt_info {
179 + enum jbt_state state, last_state;
180 + struct spi_device *spi_dev;
181 + struct mutex lock; /* protects tx_buf and reg_cache */
182 + u16 tx_buf[8];
183 + u16 reg_cache[0xEE];
184 +};
185 +
186 +#define JBT_COMMAND 0x000
187 +#define JBT_DATA 0x100
188 +
189 +static int jbt_reg_write_nodata(struct jbt_info *jbt, u8 reg)
190 +{
191 + int rc;
192 +
193 + mutex_lock(&jbt->lock);
194 +
195 + jbt->tx_buf[0] = JBT_COMMAND | reg;
196 + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
197 + 1*sizeof(u16));
198 + if (rc == 0)
199 + jbt->reg_cache[reg] = 0;
200 +
201 + mutex_unlock(&jbt->lock);
202 +
203 + return rc;
204 +}
205 +
206 +
207 +static int jbt_reg_write(struct jbt_info *jbt, u8 reg, u8 data)
208 +{
209 + int rc;
210 +
211 + mutex_lock(&jbt->lock);
212 +
213 + jbt->tx_buf[0] = JBT_COMMAND | reg;
214 + jbt->tx_buf[1] = JBT_DATA | data;
215 + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
216 + 2*sizeof(u16));
217 + if (rc == 0)
218 + jbt->reg_cache[reg] = data;
219 +
220 + mutex_unlock(&jbt->lock);
221 +
222 + return rc;
223 +}
224 +
225 +static int jbt_reg_write16(struct jbt_info *jbt, u8 reg, u16 data)
226 +{
227 + int rc;
228 +
229 + mutex_lock(&jbt->lock);
230 +
231 + jbt->tx_buf[0] = JBT_COMMAND | reg;
232 + jbt->tx_buf[1] = JBT_DATA | (data >> 8);
233 + jbt->tx_buf[2] = JBT_DATA | (data & 0xff);
234 +
235 + rc = spi_write(jbt->spi_dev, (u8 *)jbt->tx_buf,
236 + 3*sizeof(u16));
237 + if (rc == 0)
238 + jbt->reg_cache[reg] = data;
239 +
240 + mutex_unlock(&jbt->lock);
241 +
242 + return rc;
243 +}
244 +
245 +static int jbt_init_regs(struct jbt_info *jbt, int qvga)
246 +{
247 + int rc;
248 +
249 + dev_dbg(&jbt->spi_dev->dev, "entering %cVGA mode\n", qvga ? 'Q' : ' ');
250 +
251 + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE1, 0x01);
252 + rc |= jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE2, 0x00);
253 + rc |= jbt_reg_write(jbt, JBT_REG_RGB_FORMAT, 0x60);
254 + rc |= jbt_reg_write(jbt, JBT_REG_DRIVE_SYSTEM, 0x10);
255 + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_OP, 0x56);
256 + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_MODE, 0x33);
257 + rc |= jbt_reg_write(jbt, JBT_REG_BOOSTER_FREQ, 0x11);
258 + rc |= jbt_reg_write(jbt, JBT_REG_OPAMP_SYSCLK, 0x02);
259 + rc |= jbt_reg_write(jbt, JBT_REG_VSC_VOLTAGE, 0x2b);
260 + rc |= jbt_reg_write(jbt, JBT_REG_VCOM_VOLTAGE, 0x40);
261 + rc |= jbt_reg_write(jbt, JBT_REG_EXT_DISPL, 0x03);
262 + rc |= jbt_reg_write(jbt, JBT_REG_DCCLK_DCEV, 0x04);
263 + /*
264 + * default of 0x02 in JBT_REG_ASW_SLEW responsible for 72Hz requirement
265 + * to avoid red / blue flicker
266 + */
267 + rc |= jbt_reg_write(jbt, JBT_REG_ASW_SLEW, 0x04);
268 + rc |= jbt_reg_write(jbt, JBT_REG_DUMMY_DISPLAY, 0x00);
269 +
270 + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_A, 0x11);
271 + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_B, 0x11);
272 + rc |= jbt_reg_write(jbt, JBT_REG_SLEEP_OUT_FR_C, 0x11);
273 + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_D, 0x2040);
274 + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_E, 0x60c0);
275 + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_F, 0x1020);
276 + rc |= jbt_reg_write16(jbt, JBT_REG_SLEEP_IN_LCCNT_G, 0x60c0);
277 +
278 + rc |= jbt_reg_write16(jbt, JBT_REG_GAMMA1_FINE_1, 0x5533);
279 + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_FINE_2, 0x00);
280 + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_INCLINATION, 0x00);
281 + rc |= jbt_reg_write(jbt, JBT_REG_GAMMA1_BLUE_OFFSET, 0x00);
282 +
283 + if (!qvga) {
284 + rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_VGA, 0x1f0);
285 + rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL, 0x02);
286 + rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV, 0x0804);
287 +
288 + rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF, 0x01);
289 + rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2, 0x0000);
290 +
291 + rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING, 0x0d0e);
292 + rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1, 0x11a4);
293 + rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2, 0x0e);
294 + } else {
295 + rc |= jbt_reg_write16(jbt, JBT_REG_HCLOCK_QVGA, 0x00ff);
296 + rc |= jbt_reg_write(jbt, JBT_REG_BLANK_CONTROL_QVGA, 0x02);
297 + rc |= jbt_reg_write16(jbt, JBT_REG_BLANK_TH_TV_QVGA, 0x0804);
298 +
299 + rc |= jbt_reg_write(jbt, JBT_REG_CKV_ON_OFF_QVGA, 0x01);
300 + rc |= jbt_reg_write16(jbt, JBT_REG_CKV_1_2_QVGA, 0x0008);
301 +
302 + rc |= jbt_reg_write16(jbt, JBT_REG_OEV_TIMING_QVGA, 0x050a);
303 + rc |= jbt_reg_write16(jbt, JBT_REG_ASW_TIMING_1_QVGA, 0x0a19);
304 + rc |= jbt_reg_write(jbt, JBT_REG_ASW_TIMING_2_QVGA, 0x0a);
305 + }
306 +
307 + return rc ? -EIO : 0;
308 +}
309 +
310 +static int standby_to_sleep(struct jbt_info *jbt)
311 +{
312 + int rc;
313 +
314 + /* three times command zero */
315 + rc = jbt_reg_write_nodata(jbt, 0x00);
316 + mdelay(1);
317 + rc |= jbt_reg_write_nodata(jbt, 0x00);
318 + mdelay(1);
319 + rc |= jbt_reg_write_nodata(jbt, 0x00);
320 + mdelay(1);
321 +
322 + /* deep standby out */
323 + rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x17);
324 +
325 + return rc ? -EIO : 0;
326 +}
327 +
328 +static int sleep_to_normal(struct jbt_info *jbt)
329 +{
330 + int rc;
331 +
332 + /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
333 + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x80);
334 +
335 + /* Quad mode off */
336 + rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x00);
337 +
338 + /* AVDD on, XVDD on */
339 + rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16);
340 +
341 + /* Output control */
342 + rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xfff9);
343 +
344 + /* Sleep mode off */
345 + rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT);
346 +
347 + /* initialize register set */
348 + rc |= jbt_init_regs(jbt, 0);
349 +
350 + return rc ? -EIO : 0;
351 +}
352 +
353 +static int sleep_to_qvga_normal(struct jbt_info *jbt)
354 +{
355 + int rc;
356 +
357 + /* RGB I/F on, RAM wirte off, QVGA through, SIGCON enable */
358 + rc = jbt_reg_write(jbt, JBT_REG_DISPLAY_MODE, 0x81);
359 +
360 + /* Quad mode on */
361 + rc |= jbt_reg_write(jbt, JBT_REG_QUAD_RATE, 0x22);
362 +
363 + /* AVDD on, XVDD on */
364 + rc |= jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x16);
365 +
366 + /* Output control */
367 + rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0xfff9);
368 +
369 + /* Sleep mode off */
370 + rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_OUT);
371 +
372 + /* initialize register set for qvga*/
373 + rc |= jbt_init_regs(jbt, 1);
374 +
375 + return rc ? -EIO : 0;
376 +}
377 +
378 +static int normal_to_sleep(struct jbt_info *jbt)
379 +{
380 + int rc;
381 +
382 + rc = jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
383 + rc |= jbt_reg_write16(jbt, JBT_REG_OUTPUT_CONTROL, 0x8002);
384 + rc |= jbt_reg_write_nodata(jbt, JBT_REG_SLEEP_IN);
385 +
386 + return rc ? -EIO : 0;
387 +}
388 +
389 +static int sleep_to_standby(struct jbt_info *jbt)
390 +{
391 + return jbt_reg_write(jbt, JBT_REG_POWER_ON_OFF, 0x00);
392 +}
393 +
394 +/* frontend function */
395 +int jbt6k74_enter_state(struct jbt_info *jbt, enum jbt_state new_state)
396 +{
397 + int rc = -EINVAL;
398 +
399 + dev_dbg(&jbt->spi_dev->dev, "entering (old_state=%u, "
400 + "new_state=%u)\n", jbt->state, new_state);
401 +
402 + switch (jbt->state) {
403 + case JBT_STATE_DEEP_STANDBY:
404 + switch (new_state) {
405 + case JBT_STATE_DEEP_STANDBY:
406 + rc = 0;
407 + break;
408 + case JBT_STATE_SLEEP:
409 + rc = standby_to_sleep(jbt);
410 + break;
411 + case JBT_STATE_NORMAL:
412 + /* first transition into sleep */
413 + rc = standby_to_sleep(jbt);
414 + /* then transition into normal */
415 + rc |= sleep_to_normal(jbt);
416 + break;
417 + case JBT_STATE_QVGA_NORMAL:
418 + /* first transition into sleep */
419 + rc = standby_to_sleep(jbt);
420 + /* then transition into normal */
421 + rc |= sleep_to_qvga_normal(jbt);
422 + break;
423 + }
424 + break;
425 + case JBT_STATE_SLEEP:
426 + switch (new_state) {
427 + case JBT_STATE_SLEEP:
428 + rc = 0;
429 + break;
430 + case JBT_STATE_DEEP_STANDBY:
431 + rc = sleep_to_standby(jbt);
432 + break;
433 + case JBT_STATE_NORMAL:
434 + rc = sleep_to_normal(jbt);
435 + break;
436 + case JBT_STATE_QVGA_NORMAL:
437 + rc = sleep_to_qvga_normal(jbt);
438 + break;
439 + }
440 + break;
441 + case JBT_STATE_NORMAL:
442 + switch (new_state) {
443 + case JBT_STATE_NORMAL:
444 + rc = 0;
445 + break;
446 + case JBT_STATE_DEEP_STANDBY:
447 + /* first transition into sleep */
448 + rc = normal_to_sleep(jbt);
449 + /* then transition into deep standby */
450 + rc |= sleep_to_standby(jbt);
451 + break;
452 + case JBT_STATE_SLEEP:
453 + rc = normal_to_sleep(jbt);
454 + break;
455 + case JBT_STATE_QVGA_NORMAL:
456 + /* first transition into sleep */
457 + rc = normal_to_sleep(jbt);
458 + /* second transition into deep standby */
459 + rc |= sleep_to_standby(jbt);
460 + /* third transition into sleep */
461 + rc |= standby_to_sleep(jbt);
462 + /* fourth transition into normal */
463 + rc |= sleep_to_qvga_normal(jbt);
464 + break;
465 + }
466 + break;
467 + case JBT_STATE_QVGA_NORMAL:
468 + switch (new_state) {
469 + case JBT_STATE_QVGA_NORMAL:
470 + rc = 0;
471 + break;
472 + case JBT_STATE_DEEP_STANDBY:
473 + /* first transition into sleep */
474 + rc = normal_to_sleep(jbt);
475 + /* then transition into deep standby */
476 + rc |= sleep_to_standby(jbt);
477 + break;
478 + case JBT_STATE_SLEEP:
479 + rc = normal_to_sleep(jbt);
480 + break;
481 + case JBT_STATE_NORMAL:
482 + /* first transition into sleep */
483 + rc = normal_to_sleep(jbt);
484 + /* second transition into deep standby */
485 + rc |= sleep_to_standby(jbt);
486 + /* third transition into sleep */
487 + rc |= standby_to_sleep(jbt);
488 + /* fourth transition into normal */
489 + rc |= sleep_to_normal(jbt);
490 + break;
491 + }
492 + break;
493 + }
494 + if (rc == 0)
495 + jbt->state = new_state;
496 +
497 + return rc;
498 +}
499 +EXPORT_SYMBOL_GPL(jbt6k74_enter_state);
500 +
501 +int jbt6k74_display_onoff(struct jbt_info *jbt, int on)
502 +{
503 + if (on)
504 + return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_ON);
505 + else
506 + return jbt_reg_write_nodata(jbt, JBT_REG_DISPLAY_OFF);
507 +}
508 +EXPORT_SYMBOL_GPL(jbt6k74_display_onoff);
509 +
510 +static ssize_t state_read(struct device *dev, struct device_attribute *attr,
511 + char *buf)
512 +{
513 + struct jbt_info *jbt = dev_get_drvdata(dev);
514 +
515 + if (jbt->state >= ARRAY_SIZE(jbt_state_names))
516 + return -EIO;
517 +
518 + return sprintf(buf, "%s\n", jbt_state_names[jbt->state]);
519 +}
520 +
521 +static ssize_t state_write(struct device *dev, struct device_attribute *attr,
522 + const char *buf, size_t count)
523 +{
524 + struct jbt_info *jbt = dev_get_drvdata(dev);
525 + int i, rc;
526 +
527 + for (i = 0; i < ARRAY_SIZE(jbt_state_names); i++) {
528 + if (!strncmp(buf, jbt_state_names[i],
529 + strlen(jbt_state_names[i]))) {
530 + rc = jbt6k74_enter_state(jbt, i);
531 + if (rc)
532 + return rc;
533 + switch (i) {
534 + case JBT_STATE_NORMAL:
535 + case JBT_STATE_QVGA_NORMAL:
536 + /* Enable display again after deep-standby */
537 + rc = jbt6k74_display_onoff(jbt, 1);
538 + if (rc)
539 + return rc;
540 + break;
541 + default:
542 + break;
543 + }
544 + return count;
545 + }
546 + }
547 +
548 + return -EINVAL;
549 +}
550 +
551 +static DEVICE_ATTR(state, 0644, state_read, state_write);
552 +
553 +static int reg_by_string(const char *name)
554 +{
555 + if (!strcmp(name, "gamma_fine1"))
556 + return JBT_REG_GAMMA1_FINE_1;
557 + else if (!strcmp(name, "gamma_fine2"))
558 + return JBT_REG_GAMMA1_FINE_2;
559 + else if (!strcmp(name, "gamma_inclination"))
560 + return JBT_REG_GAMMA1_INCLINATION;
561 + else
562 + return JBT_REG_GAMMA1_BLUE_OFFSET;
563 +}
564 +
565 +static ssize_t gamma_read(struct device *dev, struct device_attribute *attr,
566 + char *buf)
567 +{
568 + struct jbt_info *jbt = dev_get_drvdata(dev);
569 + int reg = reg_by_string(attr->attr.name);
570 + u16 val;
571 +
572 + mutex_lock(&jbt->lock);
573 + val = jbt->reg_cache[reg];
574 + mutex_unlock(&jbt->lock);
575 +
576 + return sprintf(buf, "0x%04x\n", val);
577 +}
578 +
579 +static ssize_t gamma_write(struct device *dev, struct device_attribute *attr,
580 + const char *buf, size_t count)
581 +{
582 + struct jbt_info *jbt = dev_get_drvdata(dev);
583 + int reg = reg_by_string(attr->attr.name);
584 + unsigned long val = simple_strtoul(buf, NULL, 10);
585 +
586 + jbt_reg_write(jbt, reg, val & 0xff);
587 +
588 + return count;
589 +}
590 +
591 +static DEVICE_ATTR(gamma_fine1, 0644, gamma_read, gamma_write);
592 +static DEVICE_ATTR(gamma_fine2, 0644, gamma_read, gamma_write);
593 +static DEVICE_ATTR(gamma_inclination, 0644, gamma_read, gamma_write);
594 +static DEVICE_ATTR(gamma_blue_offset, 0644, gamma_read, gamma_write);
595 +
596 +static struct attribute *jbt_sysfs_entries[] = {
597 + &dev_attr_state.attr,
598 + &dev_attr_gamma_fine1.attr,
599 + &dev_attr_gamma_fine2.attr,
600 + &dev_attr_gamma_inclination.attr,
601 + &dev_attr_gamma_blue_offset.attr,
602 + NULL,
603 +};
604 +
605 +static struct attribute_group jbt_attr_group = {
606 + .name = NULL,
607 + .attrs = jbt_sysfs_entries,
608 +};
609 +
610 +/* linux device model infrastructure */
611 +
612 +static int __devinit jbt_probe(struct spi_device *spi)
613 +{
614 + int rc;
615 + struct jbt_info *jbt;
616 +
617 + /* the controller doesn't have a MISO pin; we can't do detection */
618 +
619 + spi->mode = SPI_CPOL | SPI_CPHA;
620 + spi->bits_per_word = 9;
621 +
622 + rc = spi_setup(spi);
623 + if (rc < 0) {
624 + dev_err(&spi->dev,
625 + "error during spi_setup of jbt6k74 driver\n");
626 + return rc;
627 + }
628 +
629 + jbt = kzalloc(sizeof(*jbt), GFP_KERNEL);
630 + if (!jbt)
631 + return -ENOMEM;
632 +
633 + jbt->spi_dev = spi;
634 + jbt->state = JBT_STATE_DEEP_STANDBY;
635 + mutex_init(&jbt->lock);
636 +
637 + dev_set_drvdata(&spi->dev, jbt);
638 +
639 + rc = jbt6k74_enter_state(jbt, JBT_STATE_NORMAL);
640 + if (rc < 0) {
641 + dev_err(&spi->dev, "cannot enter NORMAL state\n");
642 + goto err_free_drvdata;
643 + }
644 +
645 + rc = jbt6k74_display_onoff(jbt, 1);
646 + if (rc < 0) {
647 + dev_err(&spi->dev, "cannot switch display on\n");
648 + goto err_standby;
649 + }
650 +
651 + rc = sysfs_create_group(&spi->dev.kobj, &jbt_attr_group);
652 + if (rc < 0) {
653 + dev_err(&spi->dev, "cannot create sysfs group\n");
654 + goto err_off;
655 + }
656 +
657 + return 0;
658 +
659 +err_off:
660 + jbt6k74_display_onoff(jbt, 0);
661 +err_standby:
662 + jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
663 +err_free_drvdata:
664 + dev_set_drvdata(&spi->dev, NULL);
665 + kfree(jbt);
666 +
667 + return rc;
668 +}
669 +
670 +static int __devexit jbt_remove(struct spi_device *spi)
671 +{
672 + struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
673 +
674 + /* We don't want to switch off the display in case the user
675 + * accidentially onloads the module (whose use count normally is 0) */
676 +
677 + sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group);
678 + dev_set_drvdata(&spi->dev, NULL);
679 + kfree(jbt);
680 +
681 + return 0;
682 +}
683 +
684 +#ifdef CONFIG_PM
685 +static int jbt_suspend(struct spi_device *spi, pm_message_t state)
686 +{
687 + struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
688 +
689 + /* Save mode for resume */
690 + jbt->last_state = jbt->state;
691 + jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY);
692 +
693 + return 0;
694 +}
695 +
696 +static int jbt_resume(struct spi_device *spi)
697 +{
698 + struct jbt_info *jbt = dev_get_drvdata(&spi->dev);
699 +
700 + jbt6k74_enter_state(jbt, jbt->last_state);
701 +
702 + switch (jbt->last_state) {
703 + case JBT_STATE_NORMAL:
704 + case JBT_STATE_QVGA_NORMAL:
705 + jbt6k74_display_onoff(jbt, 1);
706 + break;
707 + default:
708 + break;
709 + }
710 +
711 + return 0;
712 +}
713 +#else
714 +#define jbt_suspend NULL
715 +#define jbt_resume NULL
716 +#endif
717 +
718 +static struct spi_driver jbt6k74_driver = {
719 + .driver = {
720 + .name = "jbt6k74",
721 + .owner = THIS_MODULE,
722 + },
723 +
724 + .probe = jbt_probe,
725 + .remove = __devexit_p(jbt_remove),
726 + .suspend = jbt_suspend,
727 + .resume = jbt_resume,
728 +};
729 +
730 +static int __init jbt_init(void)
731 +{
732 + return spi_register_driver(&jbt6k74_driver);
733 +}
734 +
735 +static void __exit jbt_exit(void)
736 +{
737 + spi_unregister_driver(&jbt6k74_driver);
738 +}
739 +
740 +MODULE_DESCRIPTION("SPI driver for tpo JBT6K74-AS LCM control interface");
741 +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>");
742 +MODULE_LICENSE("GPL");
743 +
744 +module_init(jbt_init);
745 +module_exit(jbt_exit);
746 --
747 1.5.6.5
748
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