--- /dev/null
+From 63e56392b9024aceb610d7b4e1979e2d2cebd217 Mon Sep 17 00:00:00 2001
+From: Marat Radchenko <marat@slonopotamus.org>
+Date: Tue, 18 Oct 2011 21:48:23 +0400
+Subject: [PATCH 1/2] TSC2301 driver (touchscreen and keypad)
+
+This patch adds support for TSC2301 touchscreen/keypad/audio chip found on Nokia N800.
+Touchscreen and keypad are fully functional, audio part only provides power management.
+---
+ drivers/input/keyboard/Kconfig | 6 +
+ drivers/input/keyboard/Makefile | 1 +
+ drivers/input/keyboard/tsc2301_kp.c | 475 +++++++++++++++
+ drivers/input/touchscreen/Kconfig | 6 +
+ drivers/input/touchscreen/Makefile | 1 +
+ drivers/input/touchscreen/tsc2301_ts.c | 676 +++++++++++++++++++++
+ drivers/spi/Kconfig | 22 +
+ drivers/spi/Makefile | 3 +
+ drivers/spi/tsc2301-core.c | 297 ++++++++++
+ drivers/spi/tsc2301-mixer.c | 1003 ++++++++++++++++++++++++++++++++
+ include/linux/spi/tsc2301.h | 208 +++++++
+ 11 files changed, 2698 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/input/keyboard/tsc2301_kp.c
+ create mode 100644 drivers/input/touchscreen/tsc2301_ts.c
+ create mode 100644 drivers/spi/tsc2301-core.c
+ create mode 100644 drivers/spi/tsc2301-mixer.c
+ create mode 100644 include/linux/spi/tsc2301.h
+
+Index: linux-3.1-rc4/drivers/input/keyboard/Kconfig
+===================================================================
+--- linux-3.1-rc4.orig/drivers/input/keyboard/Kconfig 2011-10-29 22:14:01.548849676 +0200
++++ linux-3.1-rc4/drivers/input/keyboard/Kconfig 2011-10-29 22:14:10.444812519 +0200
+@@ -530,6 +530,12 @@ config KEYBOARD_TNETV107X
+ To compile this driver as a module, choose M here: the
+ module will be called tnetv107x-keypad.
+
++config KEYBOARD_TSC2301
++ tristate "TSC2301 keypad support"
++ depends on SPI_TSC2301
++ help
++ Say Y here for if you are using the keypad features of TSC2301.
++
+ config KEYBOARD_TWL4030
+ tristate "TI TWL4030/TWL5030/TPS659x0 keypad support"
+ depends on TWL4030_CORE
+Index: linux-3.1-rc4/drivers/input/keyboard/Makefile
+===================================================================
+--- linux-3.1-rc4.orig/drivers/input/keyboard/Makefile 2011-10-29 22:14:01.560849628 +0200
++++ linux-3.1-rc4/drivers/input/keyboard/Makefile 2011-10-29 22:14:10.444812519 +0200
+@@ -48,6 +48,7 @@ obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd
+ obj-$(CONFIG_KEYBOARD_TC3589X) += tc3589x-keypad.o
+ obj-$(CONFIG_KEYBOARD_TEGRA) += tegra-kbc.o
+ obj-$(CONFIG_KEYBOARD_TNETV107X) += tnetv107x-keypad.o
++obj-$(CONFIG_KEYBOARD_TSC2301) += tsc2301_kp.o
+ obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o
+ obj-$(CONFIG_KEYBOARD_XTKBD) += xtkbd.o
+ obj-$(CONFIG_KEYBOARD_W90P910) += w90p910_keypad.o
+Index: linux-3.1-rc4/drivers/input/keyboard/tsc2301_kp.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.1-rc4/drivers/input/keyboard/tsc2301_kp.c 2011-10-29 22:27:48.875046931 +0200
+@@ -0,0 +1,475 @@
++/*
++ * TSC2301 keypad driver
++ *
++ * Copyright (C) 2005-2006 Nokia Corporation
++ *
++ * Written by Jarkko Oikarinen
++ * Rewritten by Juha Yrjola <juha.yrjola@nokia.com>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/input.h>
++#include <linux/interrupt.h>
++#include <linux/irq.h>
++#include <linux/delay.h>
++#include <linux/spi/spi.h>
++
++#include <linux/spi/tsc2301.h>
++
++#define TSC2301_KEYBOARD_PRODUCT_ID 0x0051
++#define TSC2301_KEYBOARD_PRODUCT_VERSION 0x0001
++#define TSC2301_DEBOUNCE_TIME_2MS 0x0000
++#define TSC2301_DEBOUNCE_TIME_10MS 0x0800
++#define TSC2301_DEBOUNCE_TIME_20MS 0x1000
++#define TSC2301_DEBOUNCE_TIME_50MS 0x1800
++#define TSC2301_DEBOUNCE_TIME_60MS 0x2000
++#define TSC2301_DEBOUNCE_TIME_80MS 0x2800
++#define TSC2301_DEBOUNCE_TIME_100MS 0x3000
++#define TSC2301_DEBOUNCE_TIME_120MS 0x3800
++
++#define TSC2301_DEBOUNCE_TIME TSC2301_DEBOUNCE_TIME_20MS
++
++#define TSC2301_RELEASE_TIMEOUT 50
++
++struct tsc2301_kp {
++ struct input_dev *idev;
++ char phys[32];
++ spinlock_t lock;
++ struct mutex mutex;
++ struct timer_list timer;
++ u16 keys_pressed;
++ unsigned pending:1;
++ unsigned user_disabled:1;
++ unsigned disable_depth;
++
++ struct spi_transfer read_xfer[4];
++ struct spi_message read_msg;
++
++ u16 data;
++ u16 mask;
++
++ int irq;
++ s16 keymap[16];
++};
++
++static inline int tsc2301_kp_disabled(struct tsc2301 *tsc)
++{
++ return tsc->kp->disable_depth != 0;
++}
++
++static void tsc2301_kp_send_key_events(struct tsc2301 *tsc,
++ u16 prev_state,
++ u16 new_state)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++ u16 common, released, pressed;
++ int i;
++
++ common = prev_state & new_state;
++ released = common ^ prev_state;
++ pressed = common ^ new_state;
++ if (!released && !pressed)
++ return;
++ for (i = 0; i < 16 && (released || pressed); i++) {
++ if (released & 1) {
++ dev_dbg(&tsc->spi->dev, "key %d released\n", i);
++ input_report_key(kp->idev, kp->keymap[i], 0);
++ }
++ released >>= 1;
++ if (pressed & 1) {
++ dev_dbg(&tsc->spi->dev, "key %d pressed\n", i);
++ input_report_key(kp->idev, kp->keymap[i], 1);
++ }
++ pressed >>= 1;
++ }
++ input_sync(kp->idev);
++}
++
++static inline void _filter_out(struct tsc2301 *tsc, u16 prev_state,
++ u16 *new_state, int row1, int row2, u8 rect_pat)
++{
++ u16 mask;
++
++ mask = (rect_pat << (row1 * 4)) | (rect_pat << (row2 * 4));
++ mask &= ~prev_state;
++ *new_state &= ~mask;
++ dev_dbg(&tsc->spi->dev, "filtering ghost keys %02x\n", mask);
++}
++
++static void tsc2301_filter_ghost_keys(struct tsc2301 *tsc, u16 prev_state,
++ u16 *new_state)
++{
++ int row1, row2;
++ u16 key_map;
++ u16 row1_map;
++ static const u8 rect_pat[] = {
++ 0x3, 0x5, 0x9, 0x6, 0xa, 0xc, 0,
++ };
++
++ key_map = *new_state;
++ for (row1 = 0; row1 < 4; row1++) {
++ row1_map = (key_map >> (row1 * 4)) & 0xf;
++ if (!row1_map)
++ continue;
++ for (row2 = row1 + 1; row2 < 4; row2++) {
++ u16 rect_map = (key_map >> (row2 * 4)) & 0xf;
++ const u8 *rp;
++
++ rect_map &= row1_map;
++ if (!rect_map)
++ continue;
++ for (rp = rect_pat; *rp; rp++)
++ if ((rect_map & *rp) == *rp)
++ _filter_out(tsc, prev_state, new_state,
++ row1, row2, *rp);
++ }
++ }
++}
++
++static void tsc2301_kp_timer(unsigned long arg)
++{
++ struct tsc2301 *tsc = (void *) arg;
++ struct tsc2301_kp *kp = tsc->kp;
++ unsigned long flags;
++
++ tsc2301_kp_send_key_events(tsc, kp->keys_pressed, 0);
++ spin_lock_irqsave(&kp->lock, flags);
++ kp->keys_pressed = 0;
++ spin_unlock_irqrestore(&kp->lock, flags);
++}
++
++static void tsc2301_kp_rx(void *arg)
++{
++ struct tsc2301 *tsc = arg;
++ struct tsc2301_kp *kp = tsc->kp;
++ unsigned long flags;
++ u16 kp_data;
++
++ kp_data = kp->data;
++ dev_dbg(&tsc->spi->dev, "KP data %04x\n", kp_data);
++
++ tsc2301_filter_ghost_keys(tsc, kp->keys_pressed, &kp_data);
++ tsc2301_kp_send_key_events(tsc, kp->keys_pressed, kp_data);
++ spin_lock_irqsave(&kp->lock, flags);
++ kp->keys_pressed = kp_data;
++ kp->pending = 0;
++ spin_unlock_irqrestore(&kp->lock, flags);
++}
++
++static irqreturn_t tsc2301_kp_irq_handler(int irq, void *dev_id)
++{
++ struct tsc2301 *tsc = dev_id;
++ struct tsc2301_kp *kp = tsc->kp;
++ unsigned long flags;
++ int r;
++
++ spin_lock_irqsave(&kp->lock, flags);
++ if (tsc2301_kp_disabled(tsc)) {
++ spin_unlock_irqrestore(&kp->lock, flags);
++ return IRQ_HANDLED;
++ }
++ kp->pending = 1;
++ spin_unlock_irqrestore(&kp->lock, flags);
++ mod_timer(&kp->timer,
++ jiffies + msecs_to_jiffies(TSC2301_RELEASE_TIMEOUT));
++ r = spi_async(tsc->spi, &tsc->kp->read_msg);
++ if (r)
++ dev_err(&tsc->spi->dev, "kp: spi_async() failed");
++ return IRQ_HANDLED;
++}
++
++static void tsc2301_kp_start_scan(struct tsc2301 *tsc)
++{
++ tsc2301_write_reg(tsc, TSC2301_REG_KPMASK, tsc->kp->mask);
++ tsc2301_write_reg(tsc, TSC2301_REG_KEY, TSC2301_DEBOUNCE_TIME);
++}
++
++static void tsc2301_kp_stop_scan(struct tsc2301 *tsc)
++{
++ tsc2301_write_reg(tsc, TSC2301_REG_KEY, 1 << 14);
++}
++
++/* Must be called with the mutex held */
++static void tsc2301_kp_enable(struct tsc2301 *tsc)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++ unsigned long flags;
++
++ spin_lock_irqsave(&kp->lock, flags);
++ BUG_ON(!tsc2301_kp_disabled(tsc));
++ if (--kp->disable_depth != 0) {
++ spin_unlock_irqrestore(&kp->lock, flags);
++ return;
++ }
++ spin_unlock_irqrestore(&kp->lock, flags);
++
++ irq_set_irq_type(kp->irq, IRQ_TYPE_EDGE_FALLING);
++ tsc2301_kp_start_scan(tsc);
++ enable_irq(kp->irq);
++}
++
++/* Must be called with the mutex held */
++static int tsc2301_kp_disable(struct tsc2301 *tsc, int release_keys)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++ unsigned long flags;
++
++ spin_lock_irqsave(&kp->lock, flags);
++ if (kp->disable_depth++ != 0) {
++ spin_unlock_irqrestore(&kp->lock, flags);
++ goto out;
++ }
++ disable_irq_nosync(kp->irq);
++ irq_set_irq_type(kp->irq, IRQ_TYPE_NONE);
++ spin_unlock_irqrestore(&kp->lock, flags);
++
++ while (kp->pending) {
++ msleep(1);
++ }
++
++ tsc2301_kp_stop_scan(tsc);
++out:
++ if (!release_keys)
++ del_timer(&kp->timer); /* let timeout release keys */
++
++ return 0;
++}
++
++/* The following workaround is needed for a HW bug triggered by the
++ * following:
++ * 1. keep any key pressed
++ * 2. disable keypad
++ * 3. release all keys
++ * 4. reenable keypad
++ * 5. disable touch screen controller
++ *
++ * After this the keypad scanner will get stuck in busy state and won't
++ * report any interrupts for further keypresses. One way to recover is to
++ * restart the keypad scanner whenever we enable / disable the
++ * touchscreen controller.
++ */
++void tsc2301_kp_restart(struct tsc2301 *tsc)
++{
++ if (!tsc2301_kp_disabled(tsc)) {
++ tsc2301_kp_start_scan(tsc);
++ }
++}
++
++static ssize_t tsc2301_kp_disable_show(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%u\n", tsc2301_kp_disabled(tsc) ? 1 : 0);
++}
++
++static ssize_t tsc2301_kp_disable_store(struct device *dev,
++ struct device_attribute *attr,
++ const char *buf, size_t count)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_kp *kp = tsc->kp;
++ char *endp;
++ int i;
++
++ i = simple_strtoul(buf, &endp, 10);
++ i = i ? 1 : 0;
++
++ mutex_lock(&kp->mutex);
++ if (i == kp->user_disabled) {
++ mutex_unlock(&kp->mutex);
++ return count;
++ }
++ kp->user_disabled = i;
++
++ if (i)
++ tsc2301_kp_disable(tsc, 1);
++ else
++ tsc2301_kp_enable(tsc);
++ mutex_unlock(&kp->mutex);
++
++ return count;
++}
++
++static DEVICE_ATTR(disable_kp, 0664, tsc2301_kp_disable_show,
++ tsc2301_kp_disable_store);
++
++static const u16 tsc2301_kp_read_data = 0x8000 | TSC2301_REG_KPDATA;
++
++static void tsc2301_kp_setup_spi_xfer(struct tsc2301 *tsc)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++ struct spi_message *m = &kp->read_msg;
++ struct spi_transfer *x = &kp->read_xfer[0];
++
++ spi_message_init(&kp->read_msg);
++
++ x->tx_buf = &tsc2301_kp_read_data;
++ x->len = 2;
++ spi_message_add_tail(x, m);
++ x++;
++
++ x->rx_buf = &kp->data;
++ x->len = 2;
++ spi_message_add_tail(x, m);
++
++ m->complete = tsc2301_kp_rx;
++ m->context = tsc;
++}
++
++#ifdef CONFIG_PM
++int tsc2301_kp_suspend(struct tsc2301 *tsc)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++
++ mutex_lock(&kp->mutex);
++ tsc2301_kp_disable(tsc, 1);
++ mutex_unlock(&kp->mutex);
++ return 0;
++}
++
++void tsc2301_kp_resume(struct tsc2301 *tsc)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++
++ mutex_lock(&kp->mutex);
++ tsc2301_kp_enable(tsc);
++ mutex_unlock(&kp->mutex);
++}
++#endif
++
++int __devinit tsc2301_kp_init(struct tsc2301 *tsc,
++ struct tsc2301_platform_data *pdata)
++{
++ struct input_dev *idev;
++ struct tsc2301_kp *kp;
++ int r, i;
++ u16 mask;
++
++ if (pdata->keyb_int < 0) {
++ dev_err(&tsc->spi->dev, "need kbirq");
++ return -EINVAL;
++ }
++
++ kp = kzalloc(sizeof(*kp), GFP_KERNEL);
++ if (kp == NULL)
++ return -ENOMEM;
++ tsc->kp = kp;
++
++ kp->irq = pdata->keyb_int;
++ spin_lock_init(&kp->lock);
++ mutex_init(&kp->mutex);
++
++ init_timer(&kp->timer);
++ kp->timer.data = (unsigned long) tsc;
++ kp->timer.function = tsc2301_kp_timer;
++
++ idev = input_allocate_device();
++ if (idev == NULL) {
++ r = -ENOMEM;
++ goto err1;
++ }
++ if (pdata->keyb_name)
++ idev->name = pdata->keyb_name;
++ else
++ idev->name = "TSC2301 keypad";
++ snprintf(kp->phys, sizeof(kp->phys), "%s/input-kp", dev_name(&tsc->spi->dev));
++ idev->phys = kp->phys;
++
++ mask = 0;
++ idev->evbit[0] = BIT(EV_KEY);
++ for (i = 0; i < 16; i++) {
++ if (pdata->keymap[i] > 0) {
++ set_bit(pdata->keymap[i], idev->keybit);
++ kp->keymap[i] = pdata->keymap[i];
++ } else {
++ kp->keymap[i] = -1;
++ mask |= 1 << i;
++ }
++ }
++
++ if (pdata->kp_rep)
++ set_bit(EV_REP, idev->evbit);
++
++ kp->idev = idev;
++
++ tsc2301_kp_setup_spi_xfer(tsc);
++
++ r = device_create_file(&tsc->spi->dev, &dev_attr_disable_kp);
++ if (r < 0)
++ goto err2;
++
++ tsc2301_kp_start_scan(tsc);
++
++ /* IRQ mode 0 is faulty, it can cause the KBIRQ to get stuck.
++ * Mode 2 deasserts the IRQ at:
++ * - HW or SW reset
++ * - Setting SCS flag in REG_KEY register
++ * - Releasing all keys
++ * - Reading the REG_KPDATA
++ */
++ tsc2301_write_kbc(tsc, 2);
++
++ tsc2301_write_reg(tsc, TSC2301_REG_KPMASK, mask);
++ kp->mask = mask;
++
++ irq_set_irq_type(kp->irq, IRQ_TYPE_EDGE_FALLING);
++
++ r = request_irq(kp->irq, tsc2301_kp_irq_handler, IRQF_SAMPLE_RANDOM,
++ "tsc2301-kp", tsc);
++ if (r < 0) {
++ dev_err(&tsc->spi->dev, "unable to get kbirq IRQ");
++ goto err3;
++ }
++ irq_set_irq_wake(kp->irq, 1);
++
++ /* We need to read the register once..? */
++ tsc2301_read_reg(tsc, TSC2301_REG_KPDATA);
++
++ r = input_register_device(idev);
++ if (r < 0) {
++ dev_err(&tsc->spi->dev, "can't register keypad device\n");
++ goto err4;
++ }
++
++ return 0;
++
++err4:
++ free_irq(kp->irq, tsc);
++err3:
++ tsc2301_kp_stop_scan(tsc);
++ device_remove_file(&tsc->spi->dev, &dev_attr_disable_kp);
++err2:
++ input_free_device(kp->idev);
++err1:
++ kfree(kp);
++ return r;
++}
++
++void __devexit tsc2301_kp_exit(struct tsc2301 *tsc)
++{
++ struct tsc2301_kp *kp = tsc->kp;
++
++ tsc2301_kp_disable(tsc, 1);
++ input_unregister_device(kp->idev);
++ free_irq(kp->irq, tsc);
++ device_remove_file(&tsc->spi->dev, &dev_attr_disable_kp);
++
++ kfree(kp);
++}
+Index: linux-3.1-rc4/drivers/input/touchscreen/Kconfig
+===================================================================
+--- linux-3.1-rc4.orig/drivers/input/touchscreen/Kconfig 2011-10-29 22:14:01.532849745 +0200
++++ linux-3.1-rc4/drivers/input/touchscreen/Kconfig 2011-10-29 22:14:10.444812519 +0200
+@@ -673,6 +673,12 @@ config TOUCHSCREEN_TSC2007
+ To compile this driver as a module, choose M here: the
+ module will be called tsc2007.
+
++config TOUCHSCREEN_TSC2301
++ tristate "TSC2301 touchscreen support"
++ depends on SPI_TSC2301
++ help
++ Say Y here for if you are using the touchscreen features of TSC2301.
++
+ config TOUCHSCREEN_W90X900
+ tristate "W90P910 touchscreen driver"
+ depends on HAVE_CLK
+Index: linux-3.1-rc4/drivers/input/touchscreen/Makefile
+===================================================================
+--- linux-3.1-rc4.orig/drivers/input/touchscreen/Makefile 2011-10-29 22:14:01.544849693 +0200
++++ linux-3.1-rc4/drivers/input/touchscreen/Makefile 2011-10-29 22:14:10.444812519 +0200
+@@ -48,6 +48,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) +=
+ obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
+ obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
+ obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
++obj-$(CONFIG_TOUCHSCREEN_TSC2301) += tsc2301_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
+ obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001) += wacom_w8001.o
+ obj-$(CONFIG_TOUCHSCREEN_WM831X) += wm831x-ts.o
+Index: linux-3.1-rc4/drivers/input/touchscreen/tsc2301_ts.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.1-rc4/drivers/input/touchscreen/tsc2301_ts.c 2011-10-29 22:29:36.693801882 +0200
+@@ -0,0 +1,676 @@
++/*
++ * TSC2301 touchscreen driver
++ *
++ * Copyright (C) 2005-2008 Nokia Corporation
++ *
++ * Written by Jarkko Oikarinen, Imre Deak and Juha Yrjola
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
++ *
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/input.h>
++#include <linux/interrupt.h>
++#include <linux/delay.h>
++#include <linux/spi/spi.h>
++
++#include <linux/spi/tsc2301.h>
++
++/**
++ * The touchscreen interface operates as follows:
++ *
++ * Initialize:
++ * Request access to GPIO103 (DAV)
++ * tsc2301_ts_irq_handler will trigger when DAV line goes down
++ *
++ * 1) Pen is pressed against touchscreeen
++ * 2) TSC2301 performs AD conversion
++ * 3) After the conversion is done TSC2301 drives DAV line down
++ * 4) GPIO IRQ is received and tsc2301_ts_irq_handler is called
++ * 5) tsc2301_ts_irq_handler queues up an spi transfer to fetch
++ * the x, y, z1, z2 values
++ * 6) SPI framework calls tsc2301_ts_rx after the coordinates are read
++ * 7) When the penup_timer expires, there have not been DAV interrupts
++ * during the last 20ms which means the pen has been lifted.
++ */
++
++
++#define TSC2301_TOUCHSCREEN_PRODUCT_ID 0x0052
++#define TSC2301_TOUCHSCREEN_PRODUCT_VERSION 0x0001
++
++#define TSC2301_TS_PENUP_TIME 20
++
++#define TSC2301_ADCREG_CONVERSION_CTRL_BY_TSC2301 0x8000
++#define TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST 0x0000
++
++#define TSC2301_ADCREG_FUNCTION_NONE 0x0000
++#define TSC2301_ADCREG_FUNCTION_XY 0x0400
++#define TSC2301_ADCREG_FUNCTION_XYZ 0x0800
++#define TSC2301_ADCREG_FUNCTION_X 0x0C00
++#define TSC2301_ADCREG_FUNCTION_Y 0x1000
++#define TSC2301_ADCREG_FUNCTION_Z 0x1400
++#define TSC2301_ADCREG_FUNCTION_DAT1 0x1800
++#define TSC2301_ADCREG_FUNCTION_DAT2 0x1C00
++#define TSC2301_ADCREG_FUNCTION_AUX1 0x2000
++#define TSC2301_ADCREG_FUNCTION_AUX2 0x2400
++#define TSC2301_ADCREG_FUNCTION_TEMP 0x2800
++
++#define TSC2301_ADCREG_RESOLUTION_8BIT 0x0100
++#define TSC2301_ADCREG_RESOLUTION_10BIT 0x0200
++#define TSC2301_ADCREG_RESOLUTION_12BIT 0x0300
++
++#define TSC2301_ADCREG_AVERAGING_NONE 0x0000
++#define TSC2301_ADCREG_AVERAGING_4AVG 0x0040
++#define TSC2301_ADCREG_AVERAGING_8AVG 0x0080
++#define TSC2301_ADCREG_AVERAGING_16AVG 0x00C0
++
++#define TSC2301_ADCREG_CLOCK_8MHZ 0x0000
++#define TSC2301_ADCREG_CLOCK_4MHZ 0x0010
++#define TSC2301_ADCREG_CLOCK_2MHZ 0x0020
++#define TSC2301_ADCREG_CLOCK_1MHZ 0x0030
++
++#define TSC2301_ADCREG_VOLTAGE_STAB_0US 0x0000
++#define TSC2301_ADCREG_VOLTAGE_STAB_100US 0x0002
++#define TSC2301_ADCREG_VOLTAGE_STAB_500US 0x0004
++#define TSC2301_ADCREG_VOLTAGE_STAB_1MS 0x0006
++#define TSC2301_ADCREG_VOLTAGE_STAB_5MS 0x0008
++#define TSC2301_ADCREG_VOLTAGE_STAB_10MS 0x000A
++#define TSC2301_ADCREG_VOLTAGE_STAB_50MS 0x000C
++#define TSC2301_ADCREG_VOLTAGE_STAB_100MS 0x000E
++
++#define TSC2301_ADCREG_STOP_CONVERSION 0x4000
++
++#define MAX_12BIT ((1 << 12) - 1)
++
++#define TS_RECT_SIZE 8
++#define TSF_MIN_Z1 100
++#define TSF_MAX_Z2 4000
++
++#define TSF_SAMPLES 4
++
++struct ts_filter {
++ int sample_cnt;
++
++ int avg_x;
++ int avg_y;
++ int avg_z1;
++ int avg_z2;
++};
++
++struct ts_coords {
++ u16 x;
++ u16 y;
++ u16 z1;
++ u16 z2;
++};
++
++struct tsc2301_ts {
++ struct input_dev *idev;
++ char phys[32];
++ struct timer_list penup_timer;
++ struct mutex mutex;
++
++ struct spi_transfer read_xfer[2];
++ struct spi_message read_msg;
++ struct ts_coords *coords;
++
++ struct ts_filter filter;
++
++ int hw_avg_max;
++ u16 x;
++ u16 y;
++ u16 p;
++
++ u16 x_plate_ohm;
++ int stab_time;
++ int max_pressure;
++ int touch_pressure;
++
++ u8 event_sent;
++ u8 pen_down;
++ u8 disabled;
++ u8 disable_depth;
++
++ int hw_flags;
++ int irq;
++};
++
++
++static const u16 tsc2301_ts_read_data = 0x8000 | TSC2301_REG_X;
++
++static int tsc2301_ts_check_config(struct tsc2301_ts *ts, int *hw_flags)
++{
++ int flags;
++
++ flags = 0;
++ switch (ts->hw_avg_max) {
++ case 0:
++ flags |= TSC2301_ADCREG_AVERAGING_NONE;
++ break;
++ case 4:
++ flags |= TSC2301_ADCREG_AVERAGING_4AVG;
++ break;
++ case 8:
++ flags |= TSC2301_ADCREG_AVERAGING_8AVG;
++ break;
++ case 16:
++ flags |= TSC2301_ADCREG_AVERAGING_16AVG;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ switch (ts->stab_time) {
++ case 0:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_0US;
++ break;
++ case 100:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_100US;
++ break;
++ case 500:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_500US;
++ break;
++ case 1000:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_1MS;
++ break;
++ case 5000:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_5MS;
++ break;
++ case 10000:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_10MS;
++ break;
++ case 50000:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_50MS;
++ break;
++ case 100000:
++ flags |= TSC2301_ADCREG_VOLTAGE_STAB_100MS;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ *hw_flags = flags;
++ return 0;
++}
++
++/*
++ * This odd three-time initialization is to work around a bug in TSC2301.
++ * See TSC2301 errata for details.
++ */
++static int tsc2301_ts_configure(struct tsc2301 *tsc, int flags)
++{
++ struct spi_transfer xfer[5];
++ struct spi_transfer *x;
++ struct spi_message m;
++ int i;
++ u16 val1, val2, val3;
++ u16 data[10];
++
++ val1 = TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST |
++ TSC2301_ADCREG_STOP_CONVERSION |
++ TSC2301_ADCREG_FUNCTION_NONE |
++ TSC2301_ADCREG_RESOLUTION_12BIT |
++ TSC2301_ADCREG_AVERAGING_NONE |
++ TSC2301_ADCREG_CLOCK_2MHZ |
++ TSC2301_ADCREG_VOLTAGE_STAB_100MS;
++
++ val2 = TSC2301_ADCREG_CONVERSION_CTRL_BY_HOST |
++ TSC2301_ADCREG_FUNCTION_XYZ |
++ TSC2301_ADCREG_RESOLUTION_12BIT |
++ TSC2301_ADCREG_AVERAGING_16AVG |
++ TSC2301_ADCREG_CLOCK_1MHZ |
++ TSC2301_ADCREG_VOLTAGE_STAB_100MS;
++
++ /* Averaging and voltage stabilization settings in flags */
++ val3 = TSC2301_ADCREG_CONVERSION_CTRL_BY_TSC2301 |
++ TSC2301_ADCREG_FUNCTION_XYZ |
++ TSC2301_ADCREG_RESOLUTION_12BIT |
++ TSC2301_ADCREG_CLOCK_2MHZ |
++ flags;
++
++ /* Now we prepare the command for transferring */
++ data[0] = TSC2301_REG_ADC;
++ data[1] = val1;
++ data[2] = TSC2301_REG_ADC;
++ data[3] = val2;
++ data[4] = TSC2301_REG_ADC;
++ data[5] = val3;
++ data[6] = TSC2301_REG_REF;
++ data[7] = 1 << 4 | 1 << 2 | 1; /* intref, 100uS settl, 2.5V ref */
++ data[8] = TSC2301_REG_CONFIG;
++ data[9] = 3 << 3 | 2 << 0; /* 340uS pre-chrg, 544us delay */
++
++ spi_message_init(&m);
++ m.spi = tsc->spi;
++
++ memset(xfer, 0, sizeof(xfer));
++ x = &xfer[0];
++
++ for (i = 0; i < 10; i += 2) {
++ x->tx_buf = &data[i];
++ x->len = 4;
++ if (i != 8)
++ x->cs_change = 1;
++ spi_message_add_tail(x, &m);
++ x++;
++ }
++ spi_sync(m.spi, &m);
++
++ return 0;
++}
++
++static void tsc2301_ts_start_scan(struct tsc2301 *tsc)
++{
++ tsc2301_ts_configure(tsc, tsc->ts->hw_flags);
++ tsc2301_kp_restart(tsc);
++}
++
++static void tsc2301_ts_stop_scan(struct tsc2301 *tsc)
++{
++ tsc2301_write_reg(tsc, TSC2301_REG_ADC, TSC2301_ADCREG_STOP_CONVERSION);
++ tsc2301_kp_restart(tsc);
++}
++
++static void update_pen_state(struct tsc2301_ts *ts, int x, int y, int pressure)
++{
++ if (pressure) {
++ input_report_abs(ts->idev, ABS_X, x);
++ input_report_abs(ts->idev, ABS_Y, y);
++ input_report_abs(ts->idev, ABS_PRESSURE, pressure);
++ if (!ts->pen_down)
++ input_report_key(ts->idev, BTN_TOUCH, 1);
++ ts->pen_down = 1;
++ } else {
++ input_report_abs(ts->idev, ABS_PRESSURE, 0);
++ if (ts->pen_down)
++ input_report_key(ts->idev, BTN_TOUCH, 0);
++ ts->pen_down = 0;
++ }
++
++ input_sync(ts->idev);
++
++#ifdef VERBOSE
++ dev_dbg(&tsc->spi->dev, "x %4d y %4d p %4d\n", x, y, pressure);
++#endif
++}
++
++static int filter(struct tsc2301_ts *ts, int x, int y, int z1, int z2)
++{
++ int inside_rect, pressure_limit, Rt;
++ struct ts_filter *tsf = &ts->filter;
++
++ /* validate pressure and position */
++ if (x > MAX_12BIT || y > MAX_12BIT)
++ return 0;
++
++ /* skip coords if the pressure-components are out of range */
++ if (z1 < TSF_MIN_Z1 || z2 > TSF_MAX_Z2)
++ return 0;
++
++ /* Use the x,y,z1,z2 directly on the first "pen down" event */
++ if (ts->event_sent) {
++ tsf->avg_x += x;
++ tsf->avg_y += y;
++ tsf->avg_z1 += z1;
++ tsf->avg_z2 += z2;
++
++ if (++tsf->sample_cnt < TSF_SAMPLES)
++ return 0;
++ x = tsf->avg_x / TSF_SAMPLES;
++ y = tsf->avg_y / TSF_SAMPLES;
++ z1 = tsf->avg_z1 / TSF_SAMPLES;
++ z2 = tsf->avg_z2 / TSF_SAMPLES;
++ }
++ tsf->sample_cnt = 0;
++ tsf->avg_x = 0;
++ tsf->avg_y = 0;
++ tsf->avg_z1 = 0;
++ tsf->avg_z2 = 0;
++
++ pressure_limit = ts->event_sent? ts->max_pressure: ts->touch_pressure;
++
++ /* z1 is always at least 100: */
++ Rt = x * (z2 - z1) / z1;
++ Rt = Rt * ts->x_plate_ohm / 4096;
++ if (Rt > pressure_limit)
++ return 0;
++
++ /* discard the event if it still is within the previous rect - unless
++ * if the pressure is harder, but then use previous x,y position */
++ inside_rect = (
++ x > (int)ts->x - TS_RECT_SIZE && x < (int)ts->x + TS_RECT_SIZE &&
++ y > (int)ts->y - TS_RECT_SIZE && y < (int)ts->y + TS_RECT_SIZE);
++
++ if (!ts->event_sent || !inside_rect) {
++ ts->x = x;
++ ts->y = y;
++ ts->p = Rt;
++ return 1;
++ } else if (Rt < ts->p) {
++ ts->p = Rt;
++ return 1;
++ }
++ return 0;
++}
++
++/*
++ * This procedure is called by the SPI framework after the coordinates
++ * have been read from TSC2301
++ */
++static void tsc2301_ts_rx(void *arg)
++{
++ struct tsc2301 *tsc = arg;
++ struct tsc2301_ts *ts = tsc->ts;
++ int send_event;
++ int x, y, z1, z2;
++
++ x = ts->coords->x;
++ y = ts->coords->y;
++ z1 = ts->coords->z1;
++ z2 = ts->coords->z2;
++
++ send_event = filter(ts, x, y, z1, z2);
++ if (send_event) {
++ update_pen_state(ts, ts->x, ts->y, ts->p);
++ ts->event_sent = 1;
++ }
++
++ mod_timer(&ts->penup_timer,
++ jiffies + msecs_to_jiffies(TSC2301_TS_PENUP_TIME));
++}
++
++/*
++ * Timer is called TSC2301_TS_PENUP_TIME after pen is up
++ */
++static void tsc2301_ts_timer_handler(unsigned long data)
++{
++ struct tsc2301 *tsc = (struct tsc2301 *)data;
++ struct tsc2301_ts *ts = tsc->ts;
++
++ if (ts->event_sent) {
++ ts->event_sent = 0;
++ update_pen_state(ts, 0, 0, 0);
++ }
++}
++
++/*
++ * This interrupt is called when pen is down and coordinates are
++ * available. That is indicated by a falling edge on DEV line.
++ */
++static irqreturn_t tsc2301_ts_irq_handler(int irq, void *dev_id)
++{
++ struct tsc2301 *tsc = dev_id;
++ struct tsc2301_ts *ts = tsc->ts;
++ int r;
++
++ r = spi_async(tsc->spi, &ts->read_msg);
++ if (r)
++ dev_err(&tsc->spi->dev, "ts: spi_async() failed");
++
++ mod_timer(&ts->penup_timer,
++ jiffies + msecs_to_jiffies(TSC2301_TS_PENUP_TIME));
++
++ return IRQ_HANDLED;
++}
++
++static void tsc2301_ts_disable(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++
++ if (ts->disable_depth++ != 0)
++ return;
++
++ disable_irq(ts->irq);
++
++ /* wait until penup timer expire normally */
++ do {
++ msleep(1);
++ } while (ts->event_sent);
++
++ tsc2301_ts_stop_scan(tsc);
++}
++
++static void tsc2301_ts_enable(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++
++ if (--ts->disable_depth != 0)
++ return;
++
++ enable_irq(ts->irq);
++
++ tsc2301_ts_start_scan(tsc);
++}
++
++#ifdef CONFIG_PM
++int tsc2301_ts_suspend(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++
++ mutex_lock(&ts->mutex);
++ tsc2301_ts_disable(tsc);
++ mutex_unlock(&ts->mutex);
++
++ return 0;
++}
++
++void tsc2301_ts_resume(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++
++ mutex_lock(&ts->mutex);
++ tsc2301_ts_enable(tsc);
++ mutex_unlock(&ts->mutex);
++}
++#endif
++
++static void tsc2301_ts_setup_spi_xfer(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++ struct spi_message *m = &ts->read_msg;
++ struct spi_transfer *x = &ts->read_xfer[0];
++
++ spi_message_init(m);
++
++ x->tx_buf = &tsc2301_ts_read_data;
++ x->len = 2;
++ spi_message_add_tail(x, m);
++
++ x++;
++ x->rx_buf = ts->coords;
++ x->len = 8;
++ spi_message_add_tail(x, m);
++
++ m->complete = tsc2301_ts_rx;
++ m->context = tsc;
++}
++
++static ssize_t tsc2301_ts_pen_down_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++
++ return sprintf(buf, "%u\n", tsc->ts->pen_down);
++}
++
++static DEVICE_ATTR(pen_down, S_IRUGO, tsc2301_ts_pen_down_show, NULL);
++
++static ssize_t tsc2301_ts_disable_show(struct device *dev,
++ struct device_attribute *attr, char *buf)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_ts *ts = tsc->ts;
++
++ return sprintf(buf, "%u\n", ts->disabled);
++}
++
++static ssize_t tsc2301_ts_disable_store(struct device *dev,
++ struct device_attribute *attr,
++ const char *buf, size_t count)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_ts *ts = tsc->ts;
++ char *endp;
++ int i;
++
++ i = simple_strtoul(buf, &endp, 10);
++ i = i ? 1 : 0;
++ mutex_lock(&ts->mutex);
++ if (i == ts->disabled) goto out;
++ ts->disabled = i;
++
++ if (i)
++ tsc2301_ts_disable(tsc);
++ else
++ tsc2301_ts_enable(tsc);
++out:
++ mutex_unlock(&ts->mutex);
++ return count;
++}
++
++static DEVICE_ATTR(disable_ts, 0664, tsc2301_ts_disable_show,
++ tsc2301_ts_disable_store);
++
++int __devinit tsc2301_ts_init(struct tsc2301 *tsc,
++ struct tsc2301_platform_data *pdata)
++{
++ struct tsc2301_ts *ts;
++ struct input_dev *idev;
++ int r;
++ int x_max, y_max;
++ int x_fudge, y_fudge, p_fudge;
++
++ if (pdata->dav_int <= 0) {
++ dev_err(&tsc->spi->dev, "need DAV IRQ");
++ return -EINVAL;
++ }
++
++ ts = kzalloc(sizeof(*ts), GFP_KERNEL);
++ if (ts == NULL)
++ return -ENOMEM;
++ tsc->ts = ts;
++
++ ts->coords = kzalloc(sizeof(*ts->coords), GFP_KERNEL);
++ if (ts->coords == NULL) {
++ kfree(ts);
++ return -ENOMEM;
++ }
++
++ ts->irq = pdata->dav_int;
++
++ init_timer(&ts->penup_timer);
++ setup_timer(&ts->penup_timer, tsc2301_ts_timer_handler,
++ (unsigned long)tsc);
++
++ mutex_init(&ts->mutex);
++
++ ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
++ ts->hw_avg_max = pdata->ts_hw_avg;
++ ts->max_pressure = pdata->ts_max_pressure ? : MAX_12BIT;
++ ts->touch_pressure = pdata->ts_touch_pressure ? : ts->max_pressure;
++ ts->stab_time = pdata->ts_stab_time;
++
++ x_max = pdata->ts_x_max ? : 4096;
++ y_max = pdata->ts_y_max ? : 4096;
++ x_fudge = pdata->ts_x_fudge ? : 4;
++ y_fudge = pdata->ts_y_fudge ? : 8;
++ p_fudge = pdata->ts_pressure_fudge ? : 2;
++
++ if ((r = tsc2301_ts_check_config(ts, &ts->hw_flags))) {
++ dev_err(&tsc->spi->dev, "invalid configuration\n");
++ goto err2;
++ }
++
++ idev = input_allocate_device();
++ if (idev == NULL) {
++ r = -ENOMEM;
++ goto err2;
++ }
++ idev->name = "TSC2301 touchscreen";
++ snprintf(ts->phys, sizeof(ts->phys),
++ "%s/input-ts", dev_name(&tsc->spi->dev));
++ idev->phys = ts->phys;
++ idev->dev.parent = &tsc->spi->dev;
++
++ idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
++ idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
++ ts->idev = idev;
++
++ tsc2301_ts_setup_spi_xfer(tsc);
++
++ /* These parameters should perhaps be configurable? */
++ input_set_abs_params(idev, ABS_X, 0, x_max, x_fudge, 0);
++ input_set_abs_params(idev, ABS_Y, 0, y_max, y_fudge, 0);
++ input_set_abs_params(idev, ABS_PRESSURE, 0, ts->max_pressure,
++ p_fudge, 0);
++
++ tsc2301_ts_start_scan(tsc);
++
++ r = request_irq(ts->irq, tsc2301_ts_irq_handler,
++ IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
++ "tsc2301-ts", tsc);
++ if (r < 0) {
++ dev_err(&tsc->spi->dev, "unable to get DAV IRQ");
++ goto err3;
++ }
++ irq_set_irq_wake(ts->irq, 1);
++
++ if (device_create_file(&tsc->spi->dev, &dev_attr_pen_down) < 0)
++ goto err4;
++ if (device_create_file(&tsc->spi->dev, &dev_attr_disable_ts) < 0)
++ goto err5;
++
++ r = input_register_device(idev);
++ if (r < 0) {
++ dev_err(&tsc->spi->dev, "can't register touchscreen device\n");
++ goto err6;
++ }
++
++ return 0;
++err6:
++ device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
++err5:
++ device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
++err4:
++ free_irq(ts->irq, tsc);
++err3:
++ tsc2301_ts_stop_scan(tsc);
++ input_free_device(idev);
++err2:
++ kfree(ts->coords);
++ kfree(ts);
++ return r;
++}
++
++void __devexit tsc2301_ts_exit(struct tsc2301 *tsc)
++{
++ struct tsc2301_ts *ts = tsc->ts;
++
++ tsc2301_ts_disable(tsc);
++
++ device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
++ device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
++
++ free_irq(ts->irq, tsc);
++ input_unregister_device(ts->idev);
++
++ kfree(ts->coords);
++ kfree(ts);
++}
++MODULE_AUTHOR("Jarkko Oikarinen <jarkko.oikarinen@nokia.com>");
++MODULE_LICENSE("GPL");
+Index: linux-3.1-rc4/drivers/spi/Kconfig
+===================================================================
+--- linux-3.1-rc4.orig/drivers/spi/Kconfig 2011-10-29 22:14:10.260813287 +0200
++++ linux-3.1-rc4/drivers/spi/Kconfig 2011-10-29 22:14:10.448812502 +0200
+@@ -435,6 +435,28 @@ config SPI_TLE62X0
+ sysfs interface, with each line presented as a kind of GPIO
+ exposing both switch control and diagnostic feedback.
+
++config SPI_TSC2301
++ tristate "TSC2301 driver"
++ depends on SPI_MASTER
++ help
++ Say Y here if you have a TSC2301 chip connected to an SPI
++ bus on your board.
++
++ The TSC2301 is a highly integrated PDA analog interface circuit.
++ It contains a complete 12-bit A/D resistive touch screen
++ converter (ADC) including drivers, touch pressure measurement
++ capability, keypad controller, and 8-bit D/A converter (DAC) output
++ for LCD contrast control.
++
++ To compile this driver as a module, choose M here: the
++ module will be called tsc2301.
++
++config SPI_TSC2301_AUDIO
++ boolean "TSC2301 audio support"
++ depends on SPI_TSC2301 && SND
++ help
++ Say Y here for if you are using the audio features of TSC2301.
++
+ #
+ # Add new SPI protocol masters in alphabetical order above this line
+ #
+Index: linux-3.1-rc4/drivers/spi/Makefile
+===================================================================
+--- linux-3.1-rc4.orig/drivers/spi/Makefile 2011-10-29 22:14:10.260813287 +0200
++++ linux-3.1-rc4/drivers/spi/Makefile 2011-10-29 22:14:10.448812502 +0200
+@@ -59,4 +59,6 @@ obj-$(CONFIG_SPI_TLE62X0) += spi-tle62x
+ obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o
+ obj-$(CONFIG_SPI_TXX9) += spi-txx9.o
+ obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
+-
++obj-$(CONFIG_SPI_TSC2301) += tsc2301.o
++tsc2301-objs := tsc2301-core.o
++tsc2301-$(CONFIG_SPI_TSC2301_AUDIO) += tsc2301-mixer.o
+Index: linux-3.1-rc4/drivers/spi/tsc2301-core.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.1-rc4/drivers/spi/tsc2301-core.c 2011-10-29 22:14:10.448812502 +0200
+@@ -0,0 +1,297 @@
++/*
++ * TSC2301 driver
++ *
++ * Copyright (C) 2005, 2006 Nokia Corporation
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
++ *
++ */
++
++#include <linux/module.h>
++#include <linux/device.h>
++#include <linux/delay.h>
++#include <linux/gpio.h>
++#include <linux/spi/spi.h>
++#include <linux/spi/tsc2301.h>
++
++u16 tsc2301_read_reg(struct tsc2301 *tsc, int reg)
++{
++ struct spi_transfer t[2];
++ struct spi_message m;
++ u16 data = 0, cmd;
++
++ cmd = reg;
++ cmd |= 0x8000;
++
++ memset(t, 0, sizeof(t));
++ spi_message_init(&m);
++ m.spi = tsc->spi;
++
++ t[0].tx_buf = &cmd;
++ t[0].rx_buf = NULL;
++ t[0].len = 2;
++ spi_message_add_tail(&t[0], &m);
++
++ t[1].tx_buf = NULL;
++ t[1].rx_buf = &data;
++ t[1].len = 2;
++ spi_message_add_tail(&t[1], &m);
++
++ spi_sync(m.spi, &m);
++
++ return data;
++}
++
++void tsc2301_write_reg(struct tsc2301 *tsc, int reg, u16 val)
++{
++ struct spi_transfer t;
++ struct spi_message m;
++ u16 data[2];
++
++ /* Now we prepare the command for transferring */
++ data[0] = reg;
++ data[1] = val;
++
++ spi_message_init(&m);
++ m.spi = tsc->spi;
++
++ memset(&t, 0, sizeof(t));
++ t.tx_buf = data;
++ t.rx_buf = NULL;
++ t.len = 4;
++ spi_message_add_tail(&t, &m);
++
++ spi_sync(m.spi, &m);
++}
++
++void tsc2301_write_kbc(struct tsc2301 *tsc, int val)
++{
++ u16 w;
++
++ w = tsc->config2_shadow;
++ w &= ~(0x03 << 14);
++ w |= (val & 0x03) << 14;
++ tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
++ tsc->config2_shadow = w;
++}
++
++void tsc2301_write_pll(struct tsc2301 *tsc,
++ int pll_n, int pll_a, int pll_pdc, int pct_e, int pll_o)
++{
++ u16 w;
++
++ w = tsc->config2_shadow;
++ w &= ~0x3fff;
++ w |= (pll_n & 0x0f) | ((pll_a & 0x0f) << 4) | ((pll_pdc & 0x0f) << 8);
++ w |= pct_e ? (1 << 12) : 0;
++ w |= pll_o ? (1 << 13) : 0;
++ tsc2301_write_reg(tsc, TSC2301_REG_CONFIG2, w);
++ tsc->config2_shadow = w;
++}
++
++void tsc2301_read_buf(struct tsc2301 *tsc, int reg, u16 *rx_buf, int len)
++{
++ struct spi_transfer t[2];
++ struct spi_message m;
++ u16 cmd, i;
++
++ cmd = reg;
++ cmd |= 0x8000;
++
++ spi_message_init(&m);
++ m.spi = tsc->spi;
++
++ memset(t, 0, sizeof(t));
++ t[0].tx_buf = &cmd;
++ t[0].rx_buf = NULL;
++ t[0].len = 2;
++ spi_message_add_tail(&t[0], &m);
++
++ t[1].tx_buf = NULL;
++ t[1].rx_buf = rx_buf;
++ t[1].len = 2 * len;
++ spi_message_add_tail(&t[1], &m);
++
++ spi_sync(m.spi, &m);
++
++ for (i = 0; i < len; i++)
++ printk(KERN_DEBUG "rx_buf[%d]: %04x\n", i, rx_buf[i]);
++}
++
++static int __devinit tsc2301_probe(struct spi_device *spi)
++{
++ struct tsc2301 *tsc;
++ struct tsc2301_platform_data *pdata = spi->dev.platform_data;
++ int r;
++ u16 w;
++
++ if (!pdata) {
++ dev_dbg(&spi->dev, "no platform data?\n");
++ return -ENODEV;
++ }
++
++ tsc = kzalloc(sizeof(*tsc), GFP_KERNEL);
++ if (tsc == NULL)
++ return -ENOMEM;
++
++ dev_set_drvdata(&spi->dev, tsc);
++ tsc->spi = spi;
++
++ tsc->enable_clock = pdata->enable_clock;
++ tsc->disable_clock = pdata->disable_clock;
++
++ if (pdata->reset_gpio >= 0) {
++ tsc->reset_gpio = pdata->reset_gpio;
++ r = gpio_request(tsc->reset_gpio, "TSC2301 reset");
++ if (r < 0)
++ goto err1;
++ gpio_direction_output(tsc->reset_gpio, 1);
++ mdelay(1);
++ gpio_set_value(tsc->reset_gpio, 0);
++ } else
++ tsc->reset_gpio = -1;
++
++ spi->mode = SPI_MODE_1;
++ spi->bits_per_word = 16;
++ /* The max speed might've been defined by the board-specific
++ * struct */
++ if (!spi->max_speed_hz)
++ spi->max_speed_hz = TSC2301_HZ;
++ spi_setup(spi);
++
++ /* Soft reset */
++ tsc2301_write_reg(tsc, TSC2301_REG_RESET, 0xbb00);
++ msleep(1);
++
++ w = tsc2301_read_reg(tsc, TSC2301_REG_ADC);
++ if (!(w & (1 << 14))) {
++ dev_err(&spi->dev, "invalid ADC reg value: %04x\n", w);
++ r = -ENODEV;
++ goto err1;
++ }
++
++ w = tsc2301_read_reg(tsc, TSC2301_REG_DAC);
++ if (!(w & (1 << 15))) {
++ dev_err(&spi->dev, "invalid DAC reg value: %04x\n", w);
++ r = -ENODEV;
++ goto err1;
++ }
++
++ /* Stop keypad scanning */
++ tsc2301_write_reg(tsc, TSC2301_REG_KEY, 0x4000);
++
++ /* We have to cache this for read-modify-write, since we can't
++ * read back BIT15 */
++ w = tsc2301_read_reg(tsc, TSC2301_REG_CONFIG2);
++ /* By default BIT15 is set */
++ w |= 1 << 15;
++ tsc->config2_shadow = w;
++
++ r = tsc2301_kp_init(tsc, pdata);
++ if (r)
++ goto err1;
++ r = tsc2301_ts_init(tsc, pdata);
++ if (r)
++ goto err2;
++ r = tsc2301_mixer_init(tsc, pdata);
++ if (r)
++ goto err3;
++ return 0;
++
++err3:
++ tsc2301_ts_exit(tsc);
++err2:
++ tsc2301_kp_exit(tsc);
++err1:
++ kfree(tsc);
++ return r;
++}
++
++static int __devexit tsc2301_remove(struct spi_device *spi)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
++
++ tsc2301_mixer_exit(tsc);
++ tsc2301_ts_exit(tsc);
++ tsc2301_kp_exit(tsc);
++ if (tsc->reset_gpio >= 0)
++ gpio_free(tsc->reset_gpio);
++ kfree(tsc);
++
++ return 0;
++}
++
++#ifdef CONFIG_PM
++static int tsc2301_suspend(struct spi_device *spi, pm_message_t mesg)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
++ int r;
++
++ if ((r = tsc2301_mixer_suspend(tsc)) < 0)
++ return r;
++ if ((r = tsc2301_kp_suspend(tsc)) < 0)
++ goto err1;
++ if ((r = tsc2301_ts_suspend(tsc)) < 0)
++ goto err2;
++
++ return 0;
++err2:
++ tsc2301_kp_resume(tsc);
++err1:
++ tsc2301_mixer_resume(tsc);
++ return r;
++}
++
++static int tsc2301_resume(struct spi_device *spi)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(&spi->dev);
++
++ tsc2301_ts_resume(tsc);
++ tsc2301_kp_resume(tsc);
++ tsc2301_mixer_resume(tsc);
++ return 0;
++}
++#endif
++
++static struct spi_driver tsc2301_driver = {
++ .driver = {
++ .name = "tsc2301",
++ .bus = &spi_bus_type,
++ .owner = THIS_MODULE,
++ },
++#ifdef CONFIG_PM
++ .suspend = tsc2301_suspend,
++ .resume = tsc2301_resume,
++#endif
++ .probe = tsc2301_probe,
++ .remove = __devexit_p(tsc2301_remove),
++};
++
++static int __init tsc2301_init(void)
++{
++ printk("TSC2301 driver initializing\n");
++
++ return spi_register_driver(&tsc2301_driver);
++}
++module_init(tsc2301_init);
++
++static void __exit tsc2301_exit(void)
++{
++ spi_unregister_driver(&tsc2301_driver);
++}
++module_exit(tsc2301_exit);
++
++MODULE_AUTHOR("Juha Yrjölä <juha.yrjola@nokia.com>");
++MODULE_LICENSE("GPL");
+Index: linux-3.1-rc4/drivers/spi/tsc2301-mixer.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.1-rc4/drivers/spi/tsc2301-mixer.c 2011-10-29 22:14:10.448812502 +0200
+@@ -0,0 +1,1003 @@
++/*
++ * ALSA Mixer implementation for TSC2301
++ *
++ * Copyright (C) 2006 Nokia Corporation.
++ *
++ * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
++ * Juha Yrjola
++ *
++ * Some notes about TSC2301:
++ * - PLL will stop when DAC and ADC's are powered down.
++ * - Touchscreen will stop working when audio part is powered up and if audio
++ * MCLK is stopped. Problem is avoided if audio is powered down before
++ * stopping MCLK.
++ * - Audio DAC or audio outputs will activate only after 100 msec from the
++ * chip power-up. Reason seems to be VCM since there is no this delay if the
++ * chip and VCM (bit AVPD on PD/MISC) were not powered down. The chip will
++ * consume about 1 mA if all other audio blocks are powered down except the
++ * chip itself and VCM. Full power down consumes only about few uA.
++ * - Power-down transition could happen earliest about 100 msec after the chip
++ * power-up. Otherwise power-down will fail if there is no that 100 msec
++ * on time before it. It's not obvious why is that since chip reports
++ * power-up to be completed and also PLL output on GPIO_0 is active in few
++ * milliseconds.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful, but
++ * WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ * General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
++ * 02110-1301 USA
++ *
++ */
++
++#include <linux/module.h>
++#include <linux/device.h>
++#include <linux/errno.h>
++#include <linux/delay.h>
++#include <linux/slab.h>
++#include <linux/spi/spi.h>
++#include <linux/spi/tsc2301.h>
++
++#include <sound/core.h>
++#include <sound/control.h>
++
++/* shadow register indexes */
++enum {
++ /* audio control and volume registers */
++ AUDCNTL_INDEX,
++ ADCVOL_INDEX,
++ DACVOL_INDEX,
++ BPVOL_INDEX,
++ /* keyclick control register (not needed here) */
++ /* audio power control register */
++ PD_MISC_INDEX,
++ /* TSC2301 GPIO control register */
++ GPIO_INDEX,
++
++ SHADOW_REG_COUNT,
++};
++
++/* structure for driver private data */
++struct tsc2301_mixer {
++ struct tsc2301 *tsc;
++ struct mutex mutex;
++
++ /* shadow registers holding TSC2301 audio registers. Used to hold
++ * their states during the sleep and also to reduce communication with
++ * the chip since get callback functions could get register values
++ * directly from these shadow registers without needing to read them
++ * from the chip */
++ u16 shadow_regs[SHADOW_REG_COUNT];
++
++ /* audio controller driver usage of the ADC and DAC */
++ unsigned adc_enabled:1, dac_enabled:1;
++ unsigned pll_output:1;
++ unsigned mclk_enabled;
++
++ /* latest audio power-up timestamp */
++ unsigned long pu_jiffies;
++
++ /* these are used when upper layer(s) are going to power-down TSC2301
++ * before 100 msec is passed from power-up */
++ struct delayed_work delayed_power_down;
++ unsigned delayed_pd_active:1;
++
++ int (* platform_init)(struct device *);
++ void (* platform_cleanup)(struct device *);
++
++ struct tsc2301_mixer_gpio *mixer_gpios;
++ int n_mixer_gpios;
++};
++
++#define TSC2301_DAC_DELAY msecs_to_jiffies(100)
++#define TSC2301_MIN_PU_PERIOD msecs_to_jiffies(100)
++
++#define TSC2301_REG_TO_PVAL(reg) \
++ (TSC2301_REG_TO_PAGE(reg) << 6 | TSC2301_REG_TO_ADDR(reg))
++#define TSC2301_PVAL_TO_REG(v) \
++ (TSC2301_REG((((v) >> 6) & 3),((v) & 0x1f)))
++
++#define TSC2301_VOLUME_MASK 0x7f
++#define TSC2301_MIN_ADCVOL 6
++#define TSC2301_MIN_DACVOL 0
++#define TSC2301_MIN_BPVOL 31
++#define TSC2301_MUTE_LEFT_SHIFT 15
++#define TSC2301_VOL_LEFT_SHIFT 8
++#define TSC2301_MUTE_RIGHT_SHIFT 7
++#define TSC2301_VOL_RIGHT_SHIFT 0
++
++#define TSC2301_INM_MASK 3
++#define TSC2301_INML_SHIFT 12
++#define TSC2301_INMR_SHIFT 10
++
++#define TSC2301_MICG_MASK 3
++#define TSC2301_MICG_MIN 1 /* values 0 & 1 both mean 0 dB */
++#define TSC2301_MICG_SHIFT 8
++
++#define TSC2301_REG_AUDCNTL_MCLK(v) (((v) & 3) << 6)
++#define TSC2301_REG_AUDCNTL_I2SFS(v) (((v) & 0xf) << 2)
++#define TSC2301_REG_AUDCNTL_I2SFM(v) (((v) & 3) << 0)
++
++#define TSC2301_SINGLE(xname, xindex, reg, shadow_index, shift, mask, min) \
++{\
++ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
++ .name = xname, \
++ .index = xindex, \
++ .info = snd_tsc2301_info_single, \
++ .get = snd_tsc2301_get_single, \
++ .put = snd_tsc2301_put_single, \
++ .private_value = TSC2301_REG_TO_PVAL(reg) | \
++ (shadow_index << 8) | (shift << 16) | (mask << 24) | \
++ (min << 28) \
++}
++#define TSC2301_SINGLE_MINVAL(v) (((v) >> 28) & 15)
++#define TSC2301_SINGLE_SHIFT(v) (((v) >> 16) & 15)
++#define TSC2301_SINGLE_MASK(v) (((v) >> 24) & 15)
++
++#define TSC2301_DOUBLE(xname, xindex, reg, shadow_index, ls, rs, mask, min) \
++{\
++ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
++ .name = xname, \
++ .index = xindex, \
++ .info = snd_tsc2301_info_double, \
++ .get = snd_tsc2301_get_double, \
++ .put = snd_tsc2301_put_double, \
++ .private_value = TSC2301_REG_TO_PVAL(reg) | \
++ (shadow_index << 8) | (min << 11) | \
++ (ls << 16) | (rs << 20) | (mask << 24) \
++}
++#define TSC2301_DOUBLE_MINVAL(v) (((v) >> 11) & 0x1f)
++#define TSC2301_DOUBLE_LEFT_SHIFT(v) (((v) >> 16) & 15)
++#define TSC2301_DOUBLE_RIGHT_SHIFT(v) (((v) >> 20) & 15)
++#define TSC2301_DOUBLE_MASK(v) (((v) >> 24) & TSC2301_VOLUME_MASK)
++
++#define TSC2301_MUX(xname, xindex, reg, shadow_index, ls, rs, mask) \
++{\
++ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
++ .name = xname, \
++ .index = xindex, \
++ .info = snd_tsc2301_info_mux, \
++ .get = snd_tsc2301_get_mux, \
++ .put = snd_tsc2301_put_mux, \
++ .private_value = TSC2301_REG_TO_PVAL(reg) | \
++ (shadow_index << 8) | (ls << 16) | (rs << 20) | (mask << 24) \
++}
++#define TSC2301_MUX_LEFT_SHIFT(v) (((v) >> 16) & 15)
++#define TSC2301_MUX_RIGHT_SHIFT(v) (((v) >> 20) & 15)
++#define TSC2301_MUX_MASK(v) (((v) >> 24) & TSC2301_VOLUME_MASK)
++
++#define TSC2301_BOOL(xname, xindex, reg, shadow_index, shift, invert, state) \
++{ \
++ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
++ .name = xname, \
++ .index = xindex, \
++ .info = snd_tsc2301_info_bool, \
++ .get = snd_tsc2301_get_bool, \
++ .put = snd_tsc2301_put_bool, \
++ .private_value = TSC2301_REG_TO_PVAL(reg) | \
++ (shadow_index << 8) | (shift << 16) | \
++ (invert << 24) | (state << 25) \
++}
++#define TSC2301_BOOL_SHIFT(v) (((v) >> 16) & 7)
++#define TSC2301_BOOL_INVERT(v) (((v) >> 24) & 1)
++#define TSC2301_BOOL_STATE(v) (((v) >> 25) & 1)
++
++#define TSC2301_SHADOW_INDEX(v) (((v) >> 8) & 7)
++
++/*
++ * Power-down handler for additional GPIO mixer controls. GPIO state of GPIO
++ * controls whose power-down flag is enabled are set to their false/deactivate
++ * state
++ *
++ * Must be called tsc->mixer->mutex locked
++ */
++static void tsc2301_gpio_power_down(struct tsc2301 *tsc)
++{
++ struct tsc2301_mixer *mix = tsc->mixer;
++ u16 temp;
++ int i;
++
++ temp = mix->shadow_regs[GPIO_INDEX];
++ for (i = 0; i < mix->n_mixer_gpios; i++) {
++ const struct tsc2301_mixer_gpio *mg;
++
++ mg = mix->mixer_gpios + i;
++ if (mg->deactivate_on_pd) {
++ int gpio = mg->gpio;
++
++ temp &= ~(1 << gpio);
++ temp |= mg->inverted << gpio;
++ }
++ }
++ tsc2301_write_reg(tsc, TSC2301_REG_GPIO, temp);
++}
++
++/*
++ * Powers down/up audio blocks which are muted or become unused.
++ * shadow_index >= 0, changes power state of single audio block
++ * shadow_index < 0, changes power state of all blocks
++ *
++ * Must be called tsc->mixer->mutex locked
++ */
++#define TSC2301_MUTE_MASK \
++ ((1 << TSC2301_MUTE_LEFT_SHIFT) | (1 << TSC2301_MUTE_RIGHT_SHIFT))
++static void tsc2301_power_ctrl(struct tsc2301 *tsc, int shadow_index,
++ int poll_pdsts)
++{
++ struct tsc2301_mixer *mix = tsc->mixer;
++ u16 pd_ctrl, pd_ctrl_old, w;
++ unsigned long timeout;
++ int power_up = 0;
++
++ if (mix->delayed_pd_active) {
++ mix->delayed_pd_active = 0;
++ mix->mclk_enabled--;
++ cancel_delayed_work(&mix->delayed_power_down);
++ }
++
++ pd_ctrl = pd_ctrl_old = mix->shadow_regs[PD_MISC_INDEX];
++ /* power control helper based on used space mixer selections. See
++ * actual power control decisions below */
++ if (shadow_index < 0 || shadow_index == ADCVOL_INDEX) {
++ /* ADC left and right power down control */
++ if (mix->shadow_regs[ADCVOL_INDEX] &
++ (1 << TSC2301_MUTE_LEFT_SHIFT))
++ /* left ADC muted. Power down the left ADC */
++ pd_ctrl |= TSC2301_REG_PD_MISC_ADPDL;
++ else
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_ADPDL;
++ if (mix->shadow_regs[ADCVOL_INDEX] &
++ (1 << TSC2301_MUTE_LEFT_SHIFT))
++ /* right ADC muted. Power down the right ADC */
++ pd_ctrl |= TSC2301_REG_PD_MISC_ADPDR;
++ else
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_ADPDR;
++ }
++ if (shadow_index < 0 || shadow_index == DACVOL_INDEX) {
++ /* DAC power down control */
++ if ((mix->shadow_regs[DACVOL_INDEX] &
++ TSC2301_MUTE_MASK) == TSC2301_MUTE_MASK)
++ /* both DACs muted. Power down the DAC */
++ pd_ctrl |= TSC2301_REG_PD_MISC_DAPD;
++ else
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_DAPD;
++ }
++ if (shadow_index < 0 || shadow_index == BPVOL_INDEX) {
++ /* line bypass power down control */
++ if ((mix->shadow_regs[BPVOL_INDEX] &
++ TSC2301_MUTE_MASK) == TSC2301_MUTE_MASK)
++ /* both line bypasses muted. Power down the bypass
++ * path */
++ pd_ctrl |= TSC2301_REG_PD_MISC_ABPD;
++ else
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_ABPD;
++ }
++ if (shadow_index < 0 || shadow_index == AUDCNTL_INDEX) {
++ /* mic bias power down control */
++ if ((mix->shadow_regs[AUDCNTL_INDEX] &
++ (3 << TSC2301_INML_SHIFT)) &&
++ (mix->shadow_regs[AUDCNTL_INDEX] &
++ (3 << TSC2301_INMR_SHIFT)))
++ /* both ADC channels use other than mic input. Power
++ * down the mic bias output */
++ pd_ctrl |= TSC2301_REG_PD_MISC_MIBPD;
++ else
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_MIBPD;
++ }
++
++ /* power control decisions based on codec usage and user space mixer
++ * selections detected above */
++ pd_ctrl &= ~TSC2301_REG_PD_MISC_APD; /* audio not powered down */
++ if (mix->mclk_enabled) {
++ if (!mix->adc_enabled) {
++ /* ADC not used, power down both ADC's and mic bias
++ * output independently of user space mixer
++ * selections */
++ pd_ctrl |= TSC2301_REG_PD_MISC_ADPDL;
++ pd_ctrl |= TSC2301_REG_PD_MISC_ADPDR;
++ pd_ctrl |= TSC2301_REG_PD_MISC_MIBPD;
++ }
++ if (!mix->dac_enabled) {
++ /* DAC not used, power down DAC independently of user
++ * space mixer selections */
++ pd_ctrl |= TSC2301_REG_PD_MISC_DAPD;
++ }
++
++ if (mix->pll_output) {
++ /* GPIO_0 is configured as PLL output so audio
++ * controller is expecting clock from TSC2301. Either
++ * ADC or DAC must be active in order to keep PLL on */
++ if ((pd_ctrl & TSC2301_REG_PD_MISC_ADPDL) &&
++ (pd_ctrl & TSC2301_REG_PD_MISC_ADPDR) &&
++ (pd_ctrl & TSC2301_REG_PD_MISC_DAPD)) {
++ /* neither ADC or DAC used. Force ADC on in
++ * order to keep PLL active */
++ pd_ctrl &= ~(TSC2301_REG_PD_MISC_ADPDL |
++ TSC2301_REG_PD_MISC_ADPDR);
++ }
++ }
++ } else {
++ /* audio input clock is not enabled so power down DAC and ADC
++ * in order to shutdown PLL and to keep touchscreen and keypad
++ * parts working. Touchscreen and keypad use audio clock when
++ * PLL is on and internal clock otherwise */
++ pd_ctrl |= TSC2301_REG_PD_MISC_DAPD |
++ TSC2301_REG_PD_MISC_ADPDL |
++ TSC2301_REG_PD_MISC_ADPDR;
++ }
++
++ if ((pd_ctrl & TSC2301_REG_PD_MISC_ADPDL) &&
++ (pd_ctrl & TSC2301_REG_PD_MISC_ADPDR) &&
++ (pd_ctrl & TSC2301_REG_PD_MISC_DAPD) &&
++ (pd_ctrl & TSC2301_REG_PD_MISC_ABPD)) {
++ /* all ADC, DAC and line bypass path unused. Power down the
++ * whole audio part of the TSC2301 */
++ pd_ctrl |= TSC2301_REG_PD_MISC_APD;
++ }
++
++ if (pd_ctrl == pd_ctrl_old)
++ return;
++
++ /* power down control changed. Update into TSC2301 */
++ if ((pd_ctrl ^ pd_ctrl_old) & TSC2301_REG_PD_MISC_APD) {
++ /* whole audio power state changed. Update GPIO states */
++ if (pd_ctrl & TSC2301_REG_PD_MISC_APD) {
++ /* power down GPIO controls before powering down
++ * the codec */
++ tsc2301_gpio_power_down(tsc);
++ /* we must really ensure that codec has been on no less
++ * than 100 msec before doing power-down */
++ timeout = mix->pu_jiffies + TSC2301_MIN_PU_PERIOD -
++ jiffies;
++ if (timeout <= TSC2301_MIN_PU_PERIOD) {
++ mix->delayed_pd_active = 1;
++ mix->mclk_enabled++;
++ schedule_delayed_work(&mix->delayed_power_down,
++ timeout + 1);
++ return;
++ }
++ } else
++ /* restore GPIOs after codec is powered up */
++ power_up = 1;
++ }
++ mix->shadow_regs[PD_MISC_INDEX] = pd_ctrl;
++ tsc2301_write_reg(tsc, TSC2301_REG_PD_MISC, pd_ctrl);
++ if (power_up)
++ mix->pu_jiffies = jiffies;
++ if (!poll_pdsts) {
++ if (power_up)
++ tsc2301_write_reg(tsc, TSC2301_REG_GPIO,
++ mix->shadow_regs[GPIO_INDEX]);
++ return;
++ }
++
++ /* wait until power-up/-down is completed */
++ timeout = jiffies + msecs_to_jiffies(100);
++ w = 0;
++ do {
++ if (time_after(jiffies, timeout)) {
++ /* Print a warning only if the I2S clock is not
++ * present / out of sync. This can happen during
++ * init time, when that clock will be turned on
++ * by another driver like in the OMAP EAC with
++ * external clock case.
++ */
++ if (w & TSC2301_REG_PD_MISC_OTSYN) {
++ dev_warn(&tsc->spi->dev,
++ "I2S clock not in sync or off.\n");
++ } else {
++ dev_err(&tsc->spi->dev,
++ "power-up/-down timed out "
++ "(0x%04x, 0x%04x -> 0x%04x)\n",
++ w, pd_ctrl_old, pd_ctrl);
++ }
++ goto out;
++ }
++ w = tsc2301_read_reg(tsc, TSC2301_REG_PD_MISC);
++ } while (!(w & TSC2301_REG_PD_MISC_PDSTS));
++
++out:
++ if (((pd_ctrl ^ pd_ctrl_old) & TSC2301_REG_PD_MISC_DAPD) &&
++ !(pd_ctrl & TSC2301_REG_PD_MISC_DAPD)) {
++ /* DAC powered up now. Ensure that DAC and audio outputs are
++ * activated. They are up 100 msec after the chip power-up
++ * command */
++ timeout = mix->pu_jiffies + TSC2301_DAC_DELAY - jiffies;
++ if (timeout <= TSC2301_DAC_DELAY)
++ schedule_timeout_interruptible(timeout);
++ /* FIXME: This is lazy. We restore GPIOs only after activating
++ * the DAC. It would be better to do some kind of delayed GPIO
++ * restore. That ensures that we restore them also if only ADC
++ * path is activated. But this is required only if there is
++ * some input amplifier, bias control, etc. and their power
++ * state is under TSC GPIO control */
++ tsc2301_write_reg(tsc, TSC2301_REG_GPIO,
++ mix->shadow_regs[GPIO_INDEX]);
++ }
++}
++
++static int snd_tsc2301_info_single(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_info *uinfo)
++{
++ int mask = TSC2301_SINGLE_MASK(kcontrol->private_value);
++ int minval = TSC2301_SINGLE_MINVAL(kcontrol->private_value);
++
++ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
++ uinfo->count = 1;
++ uinfo->value.integer.min = minval;
++ uinfo->value.integer.max = mask;
++
++ return 0;
++}
++
++static int snd_tsc2301_get_single(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int mask = TSC2301_SINGLE_MASK(priv);
++ int shift = TSC2301_SINGLE_SHIFT(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg;
++
++ shadow_reg = tsc->mixer->shadow_regs[shadow_index];
++
++ ucontrol->value.integer.value[0] = (shadow_reg >> shift) & mask;
++
++ return 0;
++}
++
++static int snd_tsc2301_put_single(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int mask = TSC2301_SINGLE_MASK(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg, shadow_reg_old;
++ int shift = TSC2301_SINGLE_SHIFT(priv);
++ int reg = TSC2301_PVAL_TO_REG(priv);
++ int changed;
++
++ mutex_lock(&tsc->mixer->mutex);
++ shadow_reg = shadow_reg_old = tsc->mixer->shadow_regs[shadow_index];
++
++ /* zero bits to be modified */
++ shadow_reg &= ~(mask << shift);
++ /* modify with new value */
++ shadow_reg |= ((ucontrol->value.integer.value[0] & mask) << shift);
++
++ changed = (shadow_reg != shadow_reg_old);
++ tsc->mixer->shadow_regs[shadow_index] = shadow_reg;
++
++ /* update into TSC2301 if necessary */
++ if (changed)
++ tsc2301_write_reg(tsc, reg, shadow_reg);
++ mutex_unlock(&tsc->mixer->mutex);
++
++ return changed;
++}
++
++static int snd_tsc2301_info_double(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_info *uinfo)
++{
++ /* mask == 1 : Switch
++ * mask > 1 : Max volume */
++ int mask = TSC2301_DOUBLE_MASK(kcontrol->private_value);
++ int minval = TSC2301_DOUBLE_MINVAL(kcontrol->private_value);
++
++ uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN :
++ SNDRV_CTL_ELEM_TYPE_INTEGER;
++ uinfo->count = 2;
++ uinfo->value.integer.min = minval;
++ uinfo->value.integer.max = mask;
++
++ return 0;
++}
++
++static int snd_tsc2301_get_double(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ /* mask == 1 : Switch
++ * mask > 1 : Volume */
++ int mask = TSC2301_DOUBLE_MASK(priv);
++ int ls = TSC2301_DOUBLE_LEFT_SHIFT(priv);
++ int rs = TSC2301_DOUBLE_RIGHT_SHIFT(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg;
++
++ shadow_reg = tsc->mixer->shadow_regs[shadow_index];
++
++ /* invert mute bits for the switches */
++ if (mask == 1)
++ shadow_reg = ~shadow_reg;
++
++ ucontrol->value.integer.value[0] = (shadow_reg >> ls) & mask;
++ ucontrol->value.integer.value[1] = (shadow_reg >> rs) & mask;
++
++ return 0;
++}
++
++static int snd_tsc2301_put_double(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ /* mask == 1 : Switch
++ * mask > 1 : Volume */
++ int mask = TSC2301_DOUBLE_MASK(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg, shadow_reg_old;
++ int ls = TSC2301_DOUBLE_LEFT_SHIFT(priv);
++ int rs = TSC2301_DOUBLE_RIGHT_SHIFT(priv);
++ int reg = TSC2301_PVAL_TO_REG(priv);
++ int changed;
++
++ mutex_lock(&tsc->mixer->mutex);
++ shadow_reg = shadow_reg_old = tsc->mixer->shadow_regs[shadow_index];
++
++ /* zero bits to be modified */
++ shadow_reg &= ~((mask << ls) | (mask << rs));
++ /* modify with new value */
++ if (mask == 1) {
++ /* switch. Invert switch values for the mute bits */
++ shadow_reg |=
++ ((~ucontrol->value.integer.value[0] & mask) << ls) |
++ ((~ucontrol->value.integer.value[1] & mask) << rs);
++ } else {
++ /* volume */
++ shadow_reg |=
++ (ucontrol->value.integer.value[0] << ls) |
++ (ucontrol->value.integer.value[1] << rs);
++ }
++
++ changed = (shadow_reg != shadow_reg_old);
++ tsc->mixer->shadow_regs[shadow_index] = shadow_reg;
++
++ /* update into TSC2301 if necessary */
++ if (changed)
++ tsc2301_write_reg(tsc, reg, shadow_reg);
++
++ if (mask == 1)
++ /* check is need to power down/up audio blocks in case of
++ * muted state change */
++ tsc2301_power_ctrl(tsc, shadow_index, 0);
++ mutex_unlock(&tsc->mixer->mutex);
++
++ return changed;
++}
++
++static int snd_tsc2301_info_mux(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_info *uinfo)
++{
++ static char *texts[4] = {"Mic", "Line", "Line swapped", "Line mono"};
++
++ uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
++ uinfo->count = 2;
++ uinfo->value.enumerated.items = 4;
++ if (uinfo->value.enumerated.item > 3)
++ uinfo->value.enumerated.item = 3;
++ strcpy(uinfo->value.enumerated.name,
++ texts[uinfo->value.enumerated.item]);
++
++ return 0;
++}
++
++static int snd_tsc2301_get_mux(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int mask = TSC2301_MUX_MASK(priv);
++ int ls = TSC2301_MUX_LEFT_SHIFT(priv);
++ int rs = TSC2301_MUX_RIGHT_SHIFT(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg;
++
++ shadow_reg = tsc->mixer->shadow_regs[shadow_index];
++ ucontrol->value.enumerated.item[0] = (shadow_reg >> ls) & mask;
++ ucontrol->value.enumerated.item[1] = (shadow_reg >> rs) & mask;
++
++ return 0;
++}
++
++static int snd_tsc2301_put_mux(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int mask = TSC2301_MUX_MASK(priv);
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ u16 shadow_reg, shadow_reg_old;
++ int ls = TSC2301_MUX_LEFT_SHIFT(priv);
++ int rs = TSC2301_MUX_RIGHT_SHIFT(priv);
++ int reg = TSC2301_PVAL_TO_REG(priv);
++ int changed;
++
++ mutex_lock(&tsc->mixer->mutex);
++ shadow_reg = shadow_reg_old = tsc->mixer->shadow_regs[shadow_index];
++
++ /* zero bits to be modified */
++ shadow_reg &= ~((mask << ls) | (mask << rs));
++ /* modify with new value */
++ shadow_reg |= (ucontrol->value.enumerated.item[0] << ls);
++ shadow_reg |= (ucontrol->value.enumerated.item[1] << rs);
++
++ changed = (shadow_reg != shadow_reg_old);
++
++ /* update into TSC2301 if necessary */
++ if (changed) {
++ tsc->mixer->shadow_regs[shadow_index] = shadow_reg;
++ tsc2301_write_reg(tsc, reg, shadow_reg);
++ }
++
++ /* check is need to power up/down audio blocks in case of ADC input
++ * change */
++ tsc2301_power_ctrl(tsc, shadow_index, 0);
++ mutex_unlock(&tsc->mixer->mutex);
++
++ return changed;
++}
++
++static int snd_tsc2301_info_bool(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_info *uinfo)
++{
++ uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
++ uinfo->count = 1;
++ uinfo->value.integer.min = 0;
++ uinfo->value.integer.max = 1;
++
++ return 0;
++}
++
++static int snd_tsc2301_get_bool(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ int shift = TSC2301_BOOL_SHIFT(priv);
++ int invert = TSC2301_BOOL_INVERT(priv);
++ u16 shadow_reg;
++
++ shadow_reg = tsc->mixer->shadow_regs[shadow_index];
++ ucontrol->value.integer.value[0] =
++ invert ^ ((shadow_reg >> shift) & 1);
++
++ return 0;
++}
++
++static int snd_tsc2301_put_bool(struct snd_kcontrol *kcontrol,
++ struct snd_ctl_elem_value *ucontrol)
++{
++ struct tsc2301 *tsc = kcontrol->private_data;
++ unsigned long priv = kcontrol->private_value;
++ int shadow_index = TSC2301_SHADOW_INDEX(priv);
++ int shift = TSC2301_BOOL_SHIFT(priv);
++ int invert = TSC2301_BOOL_INVERT(priv);
++ int reg = TSC2301_PVAL_TO_REG(priv);
++ u16 shadow_reg, shadow_reg_old;
++ int changed;
++
++ mutex_lock(&tsc->mixer->mutex);
++ shadow_reg = shadow_reg_old = tsc->mixer->shadow_regs[shadow_index];
++
++ /* zero bit to be modified */
++ shadow_reg &= ~(1 << shift);
++ /* modify with new value */
++ shadow_reg |=
++ (invert ^ (ucontrol->value.integer.value[0] & 1)) << shift;
++
++ changed = (shadow_reg != shadow_reg_old);
++
++ /* update into TSC2301 if necessary */
++ if (changed) {
++ tsc->mixer->shadow_regs[shadow_index] = shadow_reg;
++ if ((shadow_index == GPIO_INDEX) &&
++ (tsc->mixer->shadow_regs[PD_MISC_INDEX] &
++ TSC2301_REG_PD_MISC_APD)) {
++ /* changing GPIO control and audio is powered down.
++ * Update GPIO states according to their power-down
++ * flag */
++ tsc2301_gpio_power_down(tsc);
++ } else
++ tsc2301_write_reg(tsc, reg, shadow_reg);
++ }
++ mutex_unlock(&tsc->mixer->mutex);
++
++ return changed;
++}
++
++/* TSC2301 internal mixer controls */
++static struct snd_kcontrol_new snd_tsc2301_controls[] = {
++ /* stereo ADC input switches and volumes */
++ TSC2301_DOUBLE("Capture Switch", 0,
++ TSC2301_REG_ADCVOL, ADCVOL_INDEX,
++ TSC2301_MUTE_LEFT_SHIFT, TSC2301_MUTE_RIGHT_SHIFT,
++ 1, 0),
++ TSC2301_DOUBLE("Capture Volume", 0,
++ TSC2301_REG_ADCVOL, ADCVOL_INDEX,
++ TSC2301_VOL_LEFT_SHIFT, TSC2301_VOL_RIGHT_SHIFT,
++ TSC2301_VOLUME_MASK, TSC2301_MIN_ADCVOL),
++
++ /* stereo DAC output switches and volumes */
++ TSC2301_DOUBLE("PCM Playback Switch", 0,
++ TSC2301_REG_DACVOL, DACVOL_INDEX,
++ TSC2301_MUTE_LEFT_SHIFT, TSC2301_MUTE_RIGHT_SHIFT,
++ 1, 0),
++ TSC2301_DOUBLE("PCM Playback Volume", 0,
++ TSC2301_REG_DACVOL, DACVOL_INDEX,
++ TSC2301_VOL_LEFT_SHIFT, TSC2301_VOL_RIGHT_SHIFT,
++ TSC2301_VOLUME_MASK, TSC2301_MIN_DACVOL),
++
++ /* stereo line input bypass switches and volumes */
++ TSC2301_DOUBLE("Line Playback Switch", 0,
++ TSC2301_REG_BPVOL, BPVOL_INDEX,
++ TSC2301_MUTE_LEFT_SHIFT, TSC2301_MUTE_RIGHT_SHIFT,
++ 1, 0),
++ TSC2301_DOUBLE("Line Playback Volume", 0,
++ TSC2301_REG_BPVOL, BPVOL_INDEX,
++ TSC2301_VOL_LEFT_SHIFT, TSC2301_VOL_RIGHT_SHIFT,
++ TSC2301_VOLUME_MASK, TSC2301_MIN_BPVOL),
++
++ /* mono microphone input gain */
++ TSC2301_SINGLE("Mic Boost", 0,
++ TSC2301_REG_AUDCNTL, AUDCNTL_INDEX,
++ TSC2301_MICG_SHIFT,
++ TSC2301_MICG_MASK, TSC2301_MICG_MIN),
++
++ /* ADC input sources. Both channels could be selected separately */
++ TSC2301_MUX("Capture Source", 0,
++ TSC2301_REG_AUDCNTL, AUDCNTL_INDEX,
++ TSC2301_INML_SHIFT, TSC2301_INMR_SHIFT,
++ TSC2301_INM_MASK),
++};
++
++/* must be called tsc->mixer->mutex locked */
++static void tsc2301_flush_shadow_regs(struct tsc2301 *tsc)
++{
++ int i, page, addr;
++ u16 temp;
++
++ page = TSC2301_REG_TO_PAGE(TSC2301_REG_AUDCNTL);
++ addr = TSC2301_REG_TO_ADDR(TSC2301_REG_AUDCNTL);
++
++ for (i = 0; i < 4; i++) {
++ temp = tsc->mixer->shadow_regs[i];
++ tsc2301_write_reg(tsc, TSC2301_REG(page, addr + i), temp);
++ }
++ temp = tsc->mixer->shadow_regs[GPIO_INDEX];
++ tsc2301_write_reg(tsc, TSC2301_REG_GPIO, temp);
++
++ /* Update power state of all audio blocks depending are they
++ * muted or unused. */
++ tsc2301_power_ctrl(tsc, -1, 0);
++}
++
++#ifdef CONFIG_PM
++int tsc2301_mixer_suspend(struct tsc2301 *tsc)
++{
++ /* power down entire audio section inside TSC2301 in case the
++ * chip is still powered during the system sleep. However this driver
++ * doesn't require that chip is powered because registers are restored
++ * in function tsc2301_mixer_resume */
++ mutex_lock(&tsc->mixer->mutex);
++ tsc2301_gpio_power_down(tsc);
++ tsc->mixer->shadow_regs[PD_MISC_INDEX] |= TSC2301_REG_PD_MISC_APD;
++ tsc2301_write_reg(tsc, TSC2301_REG_PD_MISC,
++ tsc->mixer->shadow_regs[PD_MISC_INDEX]);
++ mutex_unlock(&tsc->mixer->mutex);
++ return 0;
++}
++
++void tsc2301_mixer_resume(struct tsc2301 *tsc)
++{
++ /* power up the TSC2301 audio section and restore registers */
++ mutex_lock(&tsc->mixer->mutex);
++ tsc->mixer->shadow_regs[PD_MISC_INDEX] &= ~TSC2301_REG_PD_MISC_APD;
++ tsc2301_flush_shadow_regs(tsc);
++ mutex_unlock(&tsc->mixer->mutex);
++}
++#endif
++
++void tsc2301_mixer_enable_mclk(struct device *dev)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_mixer *mix = tsc->mixer;
++
++ mutex_lock(&mix->mutex);
++ if (!mix->mclk_enabled++ && tsc->enable_clock != NULL) {
++ tsc->enable_clock(dev);
++ }
++ tsc2301_power_ctrl(tsc, -1, 1);
++ mutex_unlock(&mix->mutex);
++}
++
++void tsc2301_mixer_disable_mclk(struct device *dev)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_mixer *mix = tsc->mixer;
++
++ mutex_lock(&mix->mutex);
++ mix->mclk_enabled--;
++ tsc2301_power_ctrl(tsc, -1, 1);
++ if (!mix->mclk_enabled && tsc->disable_clock != NULL) {
++ tsc->disable_clock(dev);
++ }
++ mutex_unlock(&mix->mutex);
++}
++
++static void tsc2301_mixer_delayed_power_down(struct work_struct *work)
++{
++ struct tsc2301_mixer *mix = container_of(work, struct tsc2301_mixer,
++ delayed_power_down.work);
++ struct tsc2301 *tsc = mix->tsc;
++
++ mutex_lock(&mix->mutex);
++ if (!mix->delayed_pd_active) {
++ mutex_unlock(&mix->mutex);
++ return;
++ }
++ mix->delayed_pd_active = 0;
++ mutex_unlock(&mix->mutex);
++ tsc2301_mixer_disable_mclk(&tsc->spi->dev);
++}
++
++/*
++ * Allows audio controller driver to notify its usage of ADC and DAC
++ */
++void tsc2301_mixer_set_power(struct device *dev, int dac, int adc)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++
++ mutex_lock(&tsc->mixer->mutex);
++ tsc->mixer->adc_enabled = adc;
++ tsc->mixer->dac_enabled = dac;
++
++ /* update power state of all audio blocks */
++ tsc2301_power_ctrl(tsc, -1, 1);
++ mutex_unlock(&tsc->mixer->mutex);
++}
++
++/*
++ * Registers TSC2301 ALSA Mixer controls for the given sound card
++ */
++int tsc2301_mixer_register_controls(struct device *dev, struct snd_card *card)
++{
++ struct tsc2301 *tsc = dev_get_drvdata(dev);
++ struct tsc2301_mixer *mix = tsc->mixer;
++ int i, err;
++
++ /* Register ALSA mixer controls */
++ for (i = 0; i < ARRAY_SIZE(snd_tsc2301_controls); i++) {
++ err = snd_ctl_add(card,
++ snd_ctl_new1(&snd_tsc2301_controls[i], tsc));
++ if (err < 0)
++ return err;
++ }
++
++ if (!mix->n_mixer_gpios)
++ return 0;
++
++ /* Register additional GPIO controls if defined */
++ for (i = 0; i < mix->n_mixer_gpios; i++) {
++ const struct tsc2301_mixer_gpio *mg = mix->mixer_gpios + i;
++ struct snd_kcontrol *ctrlp;
++ struct snd_kcontrol_new ctrl =
++ TSC2301_BOOL((char *)mg->name, 0,
++ TSC2301_REG_GPIO, GPIO_INDEX,
++ mg->gpio, mg->inverted, mg->def_enable);
++
++ ctrlp = snd_ctl_new1(&ctrl, tsc);
++ err = snd_ctl_add(card, ctrlp);
++ if (err < 0)
++ return err;
++ }
++
++ return 0;
++}
++
++int tsc2301_mixer_init(struct tsc2301 *tsc,
++ struct tsc2301_platform_data *pdata)
++{
++ struct tsc2301_mixer *mix;
++ int err = 0;
++ u16 w;
++
++ mix = kzalloc(sizeof(*mix), GFP_KERNEL);
++ if (mix == NULL)
++ return -ENOMEM;
++ tsc->mixer = mix;
++
++ mix->tsc = tsc;
++ mutex_init(&mix->mutex);
++ mix->platform_init = pdata->codec_init;
++ mix->platform_cleanup = pdata->codec_cleanup;
++ mix->pll_output = pdata->pll_output;
++
++ INIT_DELAYED_WORK(&mix->delayed_power_down,
++ tsc2301_mixer_delayed_power_down);
++
++ /* initialize shadow register default values */
++ w = 0xc000;
++ w |= (pdata->mclk_ratio << 6) | (pdata->i2s_sample_rate << 2);
++ w |= pdata->i2s_format;
++ mix->shadow_regs[AUDCNTL_INDEX] = w;
++ mix->shadow_regs[ADCVOL_INDEX] = 0xd7d7;
++ mix->shadow_regs[DACVOL_INDEX] = 0xffff;
++ mix->shadow_regs[BPVOL_INDEX] = 0xe7e7;
++ mix->shadow_regs[PD_MISC_INDEX] = pdata->power_down_blocks;
++
++ /* if extra mixer controls configured, then configure associated
++ * GPIOs as output and drive their default state */
++ if (pdata->n_mixer_gpios) {
++ int i;
++
++ w = 0;
++ for (i = 0; i < pdata->n_mixer_gpios; i++) {
++ const struct tsc2301_mixer_gpio *mg;
++ int gpio;
++
++ mg = pdata->mixer_gpios + i;
++ gpio = mg->gpio;
++ w |= (1 << gpio) << 8;
++ w |= (mg->inverted ^ mg->def_enable) << gpio;
++ }
++ mix->shadow_regs[GPIO_INDEX] = w;
++
++ mix->mixer_gpios = kmalloc(sizeof(*pdata->mixer_gpios) *
++ pdata->n_mixer_gpios,
++ GFP_KERNEL);
++ if (mix->mixer_gpios == NULL) {
++ err = -ENOMEM;
++ goto err1;
++ }
++ memcpy(mix->mixer_gpios, pdata->mixer_gpios,
++ sizeof(*pdata->mixer_gpios) * pdata->n_mixer_gpios);
++ mix->n_mixer_gpios = pdata->n_mixer_gpios;
++ }
++
++ /* PLL control */
++ tsc2301_write_pll(tsc, pdata->pll_n, pdata->pll_a, pdata->pll_pdc,
++ 0, mix->pll_output ? 0 : 1);
++
++ tsc2301_flush_shadow_regs(tsc);
++
++ if (mix->platform_init != NULL) {
++ err = mix->platform_init(&tsc->spi->dev);
++ if (err < 0)
++ goto err2;
++ }
++
++ return 0;
++err2:
++ if (mix->mixer_gpios != NULL)
++ kfree(mix->mixer_gpios);
++err1:
++ kfree(mix);
++ return err;
++}
++
++void tsc2301_mixer_exit(struct tsc2301 *tsc)
++{
++ struct tsc2301_mixer *mixer = tsc->mixer;
++
++ if (mixer->platform_cleanup != NULL)
++ mixer->platform_cleanup(&tsc->spi->dev);
++
++ if (mixer->mixer_gpios != NULL)
++ kfree(mixer->mixer_gpios);
++}
++
++MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
++MODULE_LICENSE("GPL");
+Index: linux-3.1-rc4/include/linux/spi/tsc2301.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.1-rc4/include/linux/spi/tsc2301.h 2011-10-29 22:14:10.448812502 +0200
+@@ -0,0 +1,208 @@
++#ifndef _LINUX_SPI_TSC2301_H
++#define _LINUX_SPI_TSC2301_H
++
++#include <linux/types.h>
++#include <linux/timer.h>
++
++struct tsc2301_platform_data {
++ /*
++ * Keypad
++ */
++ s16 reset_gpio;
++ s16 keyb_int;
++ s16 keymap[16]; /* Set a key to a negative value if not used */
++ unsigned kp_rep:1; /* Enable keypad repeating */
++ char *keyb_name; /* Keyboard device name */
++
++ /*
++ * Touchscreen
++ */
++ s16 dav_int;
++ u16 ts_x_plate_ohm;
++ u32 ts_stab_time; /* voltage settling time */
++ u8 ts_hw_avg; /* HW assiseted averaging. Can be
++ 0, 4, 8, 16 samples per reading */
++ u32 ts_max_pressure;/* Samples with bigger pressure value will
++ be ignored, since the corresponding X, Y
++ values are unreliable */
++ u32 ts_touch_pressure; /* Pressure limit until we report a
++ touch event. After that we switch
++ to ts_max_pressure. */
++ u32 ts_pressure_fudge;
++ u32 ts_x_max;
++ u32 ts_x_fudge;
++ u32 ts_y_max;
++ u32 ts_y_fudge;
++
++ /*
++ * Audio
++ */
++ unsigned pll_pdc:4;
++ unsigned pll_a:4;
++ unsigned pll_n:4;
++ unsigned pll_output:1; /* Output PLL on GPIO_0 */
++
++ unsigned mclk_ratio:2;
++ unsigned i2s_sample_rate:4;
++ unsigned i2s_format:2;
++ /* Mask for audio blocks to be powered down */
++ u16 power_down_blocks;
++
++ /* Called after codec has been initialized, can be NULL */
++ int (* codec_init)(struct device *tsc2301_dev);
++ /* Called when codec is being removed, can be NULL */
++ void (* codec_cleanup)(struct device *tsc2301_dev);
++ int (*enable_clock)(struct device *dev);
++ void (*disable_clock)(struct device *dev);
++
++ const struct tsc2301_mixer_gpio {
++ const char *name;
++ unsigned gpio:4;
++ unsigned inverted:1;
++ unsigned def_enable:1; /* enable by default */
++ unsigned deactivate_on_pd:1; /* power-down flag */
++ } *mixer_gpios;
++ int n_mixer_gpios;
++};
++
++struct tsc2301_kp;
++struct tsc2301_ts;
++struct tsc2301_mixer;
++
++struct tsc2301 {
++ struct spi_device *spi;
++
++ s16 reset_gpio;
++ u16 config2_shadow;
++
++ struct tsc2301_kp *kp;
++ struct tsc2301_ts *ts;
++ struct tsc2301_mixer *mixer;
++
++ int (*enable_clock)(struct device *dev);
++ void (*disable_clock)(struct device *dev);
++};
++
++
++#define TSC2301_HZ 33000000
++
++#define TSC2301_REG(page, addr) (((page) << 11) | ((addr) << 5))
++#define TSC2301_REG_TO_PAGE(reg) (((reg) >> 11) & 0x03)
++#define TSC2301_REG_TO_ADDR(reg) (((reg) >> 5) & 0x1f)
++
++#define TSC2301_REG_X TSC2301_REG(0, 0)
++#define TSC2301_REG_Y TSC2301_REG(0, 1)
++#define TSC2301_REG_Z1 TSC2301_REG(0, 2)
++#define TSC2301_REG_Z2 TSC2301_REG(0, 3)
++#define TSC2301_REG_KPDATA TSC2301_REG(0, 4)
++#define TSC2301_REG_ADC TSC2301_REG(1, 0)
++#define TSC2301_REG_KEY TSC2301_REG(1, 1)
++#define TSC2301_REG_DAC TSC2301_REG(1, 2)
++#define TSC2301_REG_REF TSC2301_REG(1, 3)
++#define TSC2301_REG_RESET TSC2301_REG(1, 4)
++#define TSC2301_REG_CONFIG TSC2301_REG(1, 5)
++#define TSC2301_REG_CONFIG2 TSC2301_REG(1, 6)
++#define TSC2301_REG_KPMASK TSC2301_REG(1, 16)
++#define TSC2301_REG_AUDCNTL TSC2301_REG(2, 0)
++#define TSC2301_REG_ADCVOL TSC2301_REG(2, 1)
++#define TSC2301_REG_DACVOL TSC2301_REG(2, 2)
++#define TSC2301_REG_BPVOL TSC2301_REG(2, 3)
++#define TSC2301_REG_KEYCTL TSC2301_REG(2, 4)
++#define TSC2301_REG_PD_MISC TSC2301_REG(2, 5)
++#define TSC2301_REG_GPIO TSC2301_REG(2, 6)
++#define TSC2301_REG_ADCLKCFG TSC2301_REG(2, 27)
++
++#define TSC2301_REG_PD_MISC_APD (1 << 15)
++#define TSC2301_REG_PD_MISC_AVPD (1 << 14)
++#define TSC2301_REG_PD_MISC_ABPD (1 << 13)
++#define TSC2301_REG_PD_MISC_HAPD (1 << 12)
++#define TSC2301_REG_PD_MISC_MOPD (1 << 11)
++#define TSC2301_REG_PD_MISC_DAPD (1 << 10)
++#define TSC2301_REG_PD_MISC_ADPDL (1 << 9)
++#define TSC2301_REG_PD_MISC_ADPDR (1 << 8)
++#define TSC2301_REG_PD_MISC_PDSTS (1 << 7)
++#define TSC2301_REG_PD_MISC_MIBPD (1 << 6)
++#define TSC2301_REG_PD_MISC_OTSYN (1 << 2)
++
++/* I2S sample rate */
++#define TSC2301_I2S_SR_48000 0x00
++#define TSC2301_I2S_SR_44100 0x01
++#define TSC2301_I2S_SR_32000 0x02
++#define TSC2301_I2S_SR_24000 0x03
++#define TSC2301_I2S_SR_22050 0x04
++#define TSC2301_I2S_SR_16000 0x05
++#define TSC2301_I2S_SR_12000 0x06
++#define TSC2301_I2S_SR_11050 0x07
++#define TSC2301_I2S_SR_8000 0x08
++
++/* 16-bit, MSB-first. DAC Right-Justified, ADC Left-Justified */
++#define TSC2301_I2S_FORMAT0 0x00
++/* 20-bit, MSB-first. DAC Right-Justified, ADC Left-Justified */
++#define TSC2301_I2S_FORMAT1 0x01
++/* 20-bit, MSB-first. DAC Left-Justified, ADC Left-Justified */
++#define TSC2301_I2S_FORMAT2 0x02
++/* 20-bit, MSB-first */
++#define TSC2301_I2S_FORMAT3 0x03
++
++/* Master Clock Ratio */
++#define TSC2301_MCLK_256xFS 0x00 /* default */
++#define TSC2301_MCLK_384xFS 0x01
++#define TSC2301_MCLK_512xFS 0x02
++
++
++extern u16 tsc2301_read_reg(struct tsc2301 *tsc, int reg);
++extern void tsc2301_write_reg(struct tsc2301 *tsc, int reg, u16 val);
++extern void tsc2301_write_kbc(struct tsc2301 *tsc, int val);
++extern void tsc2301_write_pll(struct tsc2301 *tsc, int pll_n, int pll_a,
++ int pll_pdc, int pct_e, int pll_o);
++extern void tsc2301_read_buf(struct tsc2301 *tsc, int reg, u16 *buf, int len);
++
++#define TSC2301_DECL_MOD(module) \
++extern int tsc2301_##module##_init(struct tsc2301 *tsc, \
++ struct tsc2301_platform_data *pdata); \
++extern void tsc2301_##module##_exit(struct tsc2301 *tsc); \
++extern int tsc2301_##module##_suspend(struct tsc2301 *tsc); \
++extern void tsc2301_##module##_resume(struct tsc2301 *tsc);
++
++#define TSC2301_DECL_EMPTY_MOD(module) \
++static inline int tsc2301_##module##_init(struct tsc2301 *tsc, \
++ struct tsc2301_platform_data *pdata) \
++{ \
++ return 0; \
++} \
++static inline void tsc2301_##module##_exit(struct tsc2301 *tsc) {} \
++static inline int tsc2301_##module##_suspend(struct tsc2301 *tsc) \
++{ \
++ return 0; \
++} \
++static inline void tsc2301_##module##_resume(struct tsc2301 *tsc) {}
++
++#ifdef CONFIG_KEYBOARD_TSC2301
++TSC2301_DECL_MOD(kp)
++void tsc2301_kp_restart(struct tsc2301 *tsc);
++#else
++TSC2301_DECL_EMPTY_MOD(kp)
++static inline void tsc2301_kp_restart(struct tsc2301 *tsc) {}
++#endif
++
++#ifdef CONFIG_TOUCHSCREEN_TSC2301
++TSC2301_DECL_MOD(ts)
++#else
++TSC2301_DECL_EMPTY_MOD(ts)
++#endif
++
++#ifdef CONFIG_SPI_TSC2301_AUDIO
++TSC2301_DECL_MOD(mixer)
++extern void tsc2301_mixer_set_power(struct device *tsc_dev, int dac, int adc);
++
++struct snd_card;
++extern int tsc2301_mixer_register_controls(struct device *tsc_dev,
++ struct snd_card *card);
++#else
++TSC2301_DECL_EMPTY_MOD(mixer)
++#endif
++
++extern void tsc2301_mixer_enable_mclk(struct device *tsc_dev);
++extern void tsc2301_mixer_disable_mclk(struct device *tsc_dev);
++
++#endif
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