linux/drivers/input/touchscreen/wm97xx-core.c

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/*
* wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712
* and WM9713 AC97 Codecs.
*
* Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
* Parts Copyright : Ian Molton <spyro@f2s.com>
* Andrew Zabolotny <zap@homelink.ru>
* Russell King <rmk@arm.linux.org.uk>
*
* 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.
*
* Notes:
*
* Features:
* - supports WM9705, WM9712, WM9713
* - polling mode
* - continuous mode (arch-dependent)
* - adjustable rpu/dpp settings
* - adjustable pressure current
* - adjustable sample settle delay
* - 4 and 5 wire touchscreens (5 wire is WM9712 only)
* - pen down detection
* - battery monitor
* - sample AUX adcs
* - power management
* - codec GPIO
* - codec event notification
* Todo
* - Support for async sampling control for noisy LCDs.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/pm.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/mfd/wm97xx.h>
#include <linux/workqueue.h>
#include <linux/wm97xx.h>
#include <linux/uaccess.h>
#include <linux/io.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#include <linux/slab.h>
#define TS_NAME "wm97xx"
#define WM_CORE_VERSION "1.00"
#define DEFAULT_PRESSURE 0xb0c0
/*
* Touchscreen absolute values
*
* These parameters are used to help the input layer discard out of
* range readings and reduce jitter etc.
*
* o min, max:- indicate the min and max values your touch screen returns
* o fuzz:- use a higher number to reduce jitter
*
* The default values correspond to Mainstone II in QVGA mode
*
* Please read
* Documentation/input/input-programming.rst for more details.
*/
static int abs_x[3] = {150, 4000, 5};
module_param_array(abs_x, int, NULL, 0);
MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
static int abs_y[3] = {200, 4000, 40};
module_param_array(abs_y, int, NULL, 0);
MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
static int abs_p[3] = {0, 150, 4};
module_param_array(abs_p, int, NULL, 0);
MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
/*
* wm97xx IO access, all IO locking done by AC97 layer
*/
int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
{
if (wm->ac97)
return wm->ac97->bus->ops->read(wm->ac97, reg);
else
return -1;
}
EXPORT_SYMBOL_GPL(wm97xx_reg_read);
void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
{
/* cache digitiser registers */
if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
/* cache gpio regs */
if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
/* wm9713 irq reg */
if (reg == 0x5a)
wm->misc = val;
if (wm->ac97)
wm->ac97->bus->ops->write(wm->ac97, reg, val);
}
EXPORT_SYMBOL_GPL(wm97xx_reg_write);
/**
* wm97xx_read_aux_adc - Read the aux adc.
* @wm: wm97xx device.
* @adcsel: codec ADC to be read
*
* Reads the selected AUX ADC.
*/
int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
{
int power_adc = 0, auxval;
u16 power = 0;
int rc = 0;
int timeout = 0;
/* get codec */
mutex_lock(&wm->codec_mutex);
/* When the touchscreen is not in use, we may have to power up
* the AUX ADC before we can use sample the AUX inputs->
*/
if (wm->id == WM9713_ID2 &&
(power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
power_adc = 1;
wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
}
/* Prepare the codec for AUX reading */
wm->codec->aux_prepare(wm);
/* Turn polling mode on to read AUX ADC */
wm->pen_probably_down = 1;
while (rc != RC_VALID && timeout++ < 5)
rc = wm->codec->poll_sample(wm, adcsel, &auxval);
if (power_adc)
wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
wm->codec->dig_restore(wm);
wm->pen_probably_down = 0;
if (timeout >= 5) {
dev_err(wm->dev,
"timeout reading auxadc %d, disabling digitiser\n",
adcsel);
wm->codec->dig_enable(wm, false);
}
mutex_unlock(&wm->codec_mutex);
return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
}
EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
/**
* wm97xx_get_gpio - Get the status of a codec GPIO.
* @wm: wm97xx device.
* @gpio: gpio
*
* Get the status of a codec GPIO pin
*/
enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
{
u16 status;
enum wm97xx_gpio_status ret;
mutex_lock(&wm->codec_mutex);
status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
if (status & gpio)
ret = WM97XX_GPIO_HIGH;
else
ret = WM97XX_GPIO_LOW;
mutex_unlock(&wm->codec_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
/**
* wm97xx_set_gpio - Set the status of a codec GPIO.
* @wm: wm97xx device.
* @gpio: gpio
*
*
* Set the status of a codec GPIO pin
*/
void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
enum wm97xx_gpio_status status)
{
u16 reg;
mutex_lock(&wm->codec_mutex);
reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
if (status == WM97XX_GPIO_HIGH)
reg |= gpio;
else
reg &= ~gpio;
if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
else
wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
mutex_unlock(&wm->codec_mutex);
}
EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
/*
* Codec GPIO pin configuration, this sets pin direction, polarity,
* stickyness and wake up.
*/
void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
enum wm97xx_gpio_wake wake)
{
u16 reg;
mutex_lock(&wm->codec_mutex);
reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
if (pol == WM97XX_GPIO_POL_HIGH)
reg |= gpio;
else
reg &= ~gpio;
wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
if (sticky == WM97XX_GPIO_STICKY)
reg |= gpio;
else
reg &= ~gpio;
wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
if (wake == WM97XX_GPIO_WAKE)
reg |= gpio;
else
reg &= ~gpio;
wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
if (dir == WM97XX_GPIO_IN)
reg |= gpio;
else
reg &= ~gpio;
wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
mutex_unlock(&wm->codec_mutex);
}
EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
/*
* Configure the WM97XX_PRP value to use while system is suspended.
* If a value other than 0 is set then WM97xx pen detection will be
* left enabled in the configured mode while the system is in suspend,
* the device has users and suspend has not been disabled via the
* wakeup sysfs entries.
*
* @wm: WM97xx device to configure
* @mode: WM97XX_PRP value to configure while suspended
*/
void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
{
wm->suspend_mode = mode;
device_init_wakeup(&wm->input_dev->dev, mode != 0);
}
EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
/*
* Handle a pen down interrupt.
*/
static void wm97xx_pen_irq_worker(struct work_struct *work)
{
struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
int pen_was_down = wm->pen_is_down;
/* do we need to enable the touch panel reader */
if (wm->id == WM9705_ID2) {
if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
WM97XX_PEN_DOWN)
wm->pen_is_down = 1;
else
wm->pen_is_down = 0;
} else {
u16 status, pol;
mutex_lock(&wm->codec_mutex);
status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
if (WM97XX_GPIO_13 & pol & status) {
wm->pen_is_down = 1;
wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
~WM97XX_GPIO_13);
} else {
wm->pen_is_down = 0;
wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
WM97XX_GPIO_13);
}
if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
~WM97XX_GPIO_13) << 1);
else
wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
~WM97XX_GPIO_13);
mutex_unlock(&wm->codec_mutex);
}
/* If the system is not using continuous mode or it provides a
* pen down operation then we need to schedule polls while the
* pen is down. Otherwise the machine driver is responsible
* for scheduling reads.
*/
if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
if (wm->pen_is_down && !pen_was_down) {
/* Data is not available immediately on pen down */
queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
}
/* Let ts_reader report the pen up for debounce. */
if (!wm->pen_is_down && pen_was_down)
wm->pen_is_down = 1;
}
if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
wm->mach_ops->acc_pen_up(wm);
wm->mach_ops->irq_enable(wm, 1);
}
/*
* Codec PENDOWN irq handler
*
* We have to disable the codec interrupt in the handler because it
* can take up to 1ms to clear the interrupt source. We schedule a task
* in a work queue to do the actual interaction with the chip. The
* interrupt is then enabled again in the slow handler when the source
* has been cleared.
*/
static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
{
struct wm97xx *wm = dev_id;
if (!work_pending(&wm->pen_event_work)) {
wm->mach_ops->irq_enable(wm, 0);
queue_work(wm->ts_workq, &wm->pen_event_work);
}
return IRQ_HANDLED;
}
/*
* initialise pen IRQ handler and workqueue
*/
static int wm97xx_init_pen_irq(struct wm97xx *wm)
{
u16 reg;
/* If an interrupt is supplied an IRQ enable operation must also be
* provided. */
BUG_ON(!wm->mach_ops->irq_enable);
if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
"wm97xx-pen", wm)) {
dev_err(wm->dev,
"Failed to register pen down interrupt, polling");
wm->pen_irq = 0;
return -EINVAL;
}
/* Configure GPIO as interrupt source on WM971x */
if (wm->id != WM9705_ID2) {
BUG_ON(!wm->mach_ops->irq_gpio);
reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
wm97xx_reg_write(wm, AC97_MISC_AFE,
reg & ~(wm->mach_ops->irq_gpio));
reg = wm97xx_reg_read(wm, 0x5a);
wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
}
return 0;
}
static int wm97xx_read_samples(struct wm97xx *wm)
{
struct wm97xx_data data;
int rc;
mutex_lock(&wm->codec_mutex);
if (wm->mach_ops && wm->mach_ops->acc_enabled)
rc = wm->mach_ops->acc_pen_down(wm);
else
rc = wm->codec->poll_touch(wm, &data);
if (rc & RC_PENUP) {
if (wm->pen_is_down) {
wm->pen_is_down = 0;
dev_dbg(wm->dev, "pen up\n");
input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
input_report_key(wm->input_dev, BTN_TOUCH, 0);
input_sync(wm->input_dev);
} else if (!(rc & RC_AGAIN)) {
/* We need high frequency updates only while
* pen is down, the user never will be able to
* touch screen faster than a few times per
* second... On the other hand, when the user
* is actively working with the touchscreen we
* don't want to lose the quick response. So we
* will slowly increase sleep time after the
* pen is up and quicky restore it to ~one task
* switch when pen is down again.
*/
if (wm->ts_reader_interval < HZ / 10)
wm->ts_reader_interval++;
}
} else if (rc & RC_VALID) {
dev_dbg(wm->dev,
"pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
data.x >> 12, data.x & 0xfff, data.y >> 12,
data.y & 0xfff, data.p >> 12, data.p & 0xfff);
if (abs_x[0] > (data.x & 0xfff) ||
abs_x[1] < (data.x & 0xfff) ||
abs_y[0] > (data.y & 0xfff) ||
abs_y[1] < (data.y & 0xfff)) {
dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
rc = RC_AGAIN;
goto out;
}
input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
input_report_key(wm->input_dev, BTN_TOUCH, 1);
input_sync(wm->input_dev);
wm->pen_is_down = 1;
wm->ts_reader_interval = wm->ts_reader_min_interval;
} else if (rc & RC_PENDOWN) {
dev_dbg(wm->dev, "pen down\n");
wm->pen_is_down = 1;
wm->ts_reader_interval = wm->ts_reader_min_interval;
}
out:
mutex_unlock(&wm->codec_mutex);
return rc;
}
/*
* The touchscreen sample reader.
*/
static void wm97xx_ts_reader(struct work_struct *work)
{
int rc;
struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
BUG_ON(!wm->codec);
do {
rc = wm97xx_read_samples(wm);
} while (rc & RC_AGAIN);
if (wm->pen_is_down || !wm->pen_irq)
queue_delayed_work(wm->ts_workq, &wm->ts_reader,
wm->ts_reader_interval);
}
/**
* wm97xx_ts_input_open - Open the touch screen input device.
* @idev: Input device to be opened.
*
* Called by the input sub system to open a wm97xx touchscreen device.
* Starts the touchscreen thread and touch digitiser.
*/
static int wm97xx_ts_input_open(struct input_dev *idev)
{
struct wm97xx *wm = input_get_drvdata(idev);
wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
if (wm->ts_workq == NULL) {
dev_err(wm->dev,
"Failed to create workqueue\n");
return -EINVAL;
}
/* start digitiser */
if (wm->mach_ops && wm->mach_ops->acc_enabled)
wm->codec->acc_enable(wm, 1);
wm->codec->dig_enable(wm, 1);
INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
if (wm->ts_reader_min_interval < 1)
wm->ts_reader_min_interval = 1;
wm->ts_reader_interval = wm->ts_reader_min_interval;
wm->pen_is_down = 0;
if (wm->pen_irq)
wm97xx_init_pen_irq(wm);
else
dev_err(wm->dev, "No IRQ specified\n");
/* If we either don't have an interrupt for pen down events or
* failed to acquire it then we need to poll.
*/
if (wm->pen_irq == 0)
queue_delayed_work(wm->ts_workq, &wm->ts_reader,
wm->ts_reader_interval);
return 0;
}
/**
* wm97xx_ts_input_close - Close the touch screen input device.
* @idev: Input device to be closed.
*
* Called by the input sub system to close a wm97xx touchscreen
* device. Kills the touchscreen thread and stops the touch
* digitiser.
*/
static void wm97xx_ts_input_close(struct input_dev *idev)
{
struct wm97xx *wm = input_get_drvdata(idev);
u16 reg;
if (wm->pen_irq) {
/* Return the interrupt to GPIO usage (disabling it) */
if (wm->id != WM9705_ID2) {
BUG_ON(!wm->mach_ops->irq_gpio);
reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
wm97xx_reg_write(wm, AC97_MISC_AFE,
reg | wm->mach_ops->irq_gpio);
}
free_irq(wm->pen_irq, wm);
}
wm->pen_is_down = 0;
/* Balance out interrupt disables/enables */
if (cancel_work_sync(&wm->pen_event_work))
wm->mach_ops->irq_enable(wm, 1);
/* ts_reader rearms itself so we need to explicitly stop it
* before we destroy the workqueue.
*/
cancel_delayed_work_sync(&wm->ts_reader);
destroy_workqueue(wm->ts_workq);
/* stop digitiser */
wm->codec->dig_enable(wm, 0);
if (wm->mach_ops && wm->mach_ops->acc_enabled)
wm->codec->acc_enable(wm, 0);
}
static int wm97xx_register_touch(struct wm97xx *wm)
{
struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
int ret;
wm->input_dev = devm_input_allocate_device(wm->dev);
if (wm->input_dev == NULL)
return -ENOMEM;
/* set up touch configuration */
wm->input_dev->name = "wm97xx touchscreen";
wm->input_dev->phys = "wm97xx";
wm->input_dev->open = wm97xx_ts_input_open;
wm->input_dev->close = wm97xx_ts_input_close;
__set_bit(EV_ABS, wm->input_dev->evbit);
__set_bit(EV_KEY, wm->input_dev->evbit);
__set_bit(BTN_TOUCH, wm->input_dev->keybit);
input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
abs_x[2], 0);
input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
abs_y[2], 0);
input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
abs_p[2], 0);
input_set_drvdata(wm->input_dev, wm);
wm->input_dev->dev.parent = wm->dev;
ret = input_register_device(wm->input_dev);
if (ret)
return ret;
/*
* register our extended touch device (for machine specific
* extensions)
*/
wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
if (!wm->touch_dev) {
ret = -ENOMEM;
goto touch_err;
}
platform_set_drvdata(wm->touch_dev, wm);
wm->touch_dev->dev.parent = wm->dev;
wm->touch_dev->dev.platform_data = pdata;
ret = platform_device_add(wm->touch_dev);
if (ret < 0)
goto touch_reg_err;
return 0;
touch_reg_err:
platform_device_put(wm->touch_dev);
touch_err:
input_unregister_device(wm->input_dev);
wm->input_dev = NULL;
return ret;
}
static void wm97xx_unregister_touch(struct wm97xx *wm)
{
platform_device_unregister(wm->touch_dev);
input_unregister_device(wm->input_dev);
wm->input_dev = NULL;
}
static int _wm97xx_probe(struct wm97xx *wm)
{
int id = 0;
mutex_init(&wm->codec_mutex);
dev_set_drvdata(wm->dev, wm);
/* check that we have a supported codec */
id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
if (id != WM97XX_ID1) {
dev_err(wm->dev,
"Device with vendor %04x is not a wm97xx\n", id);
return -ENODEV;
}
wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
wm->variant = WM97xx_GENERIC;
dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
switch (wm->id & 0xff) {
#ifdef CONFIG_TOUCHSCREEN_WM9705
case 0x05:
wm->codec = &wm9705_codec;
break;
#endif
#ifdef CONFIG_TOUCHSCREEN_WM9712
case 0x12:
wm->codec = &wm9712_codec;
break;
#endif
#ifdef CONFIG_TOUCHSCREEN_WM9713
case 0x13:
wm->codec = &wm9713_codec;
break;
#endif
default:
dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
wm->id & 0xff);
return -ENODEV;
}
/* set up physical characteristics */
wm->codec->phy_init(wm);
/* load gpio cache */
wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
return wm97xx_register_touch(wm);
}
static void wm97xx_remove_battery(struct wm97xx *wm)
{
platform_device_unregister(wm->battery_dev);
}
static int wm97xx_add_battery(struct wm97xx *wm,
struct wm97xx_batt_pdata *pdata)
{
int ret;
wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
if (!wm->battery_dev)
return -ENOMEM;
platform_set_drvdata(wm->battery_dev, wm);
wm->battery_dev->dev.parent = wm->dev;
wm->battery_dev->dev.platform_data = pdata;
ret = platform_device_add(wm->battery_dev);
if (ret)
platform_device_put(wm->battery_dev);
return ret;
}
static int wm97xx_probe(struct device *dev)
{
struct wm97xx *wm;
int ret;
struct wm97xx_pdata *pdata = dev_get_platdata(dev);
wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
if (!wm)
return -ENOMEM;
wm->dev = dev;
wm->ac97 = to_ac97_t(dev);
ret = _wm97xx_probe(wm);
if (ret)
return ret;
ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
if (ret < 0)
goto batt_err;
return ret;
batt_err:
wm97xx_unregister_touch(wm);
return ret;
}
static int wm97xx_remove(struct device *dev)
{
struct wm97xx *wm = dev_get_drvdata(dev);
wm97xx_remove_battery(wm);
wm97xx_unregister_touch(wm);
return 0;
}
static int wm97xx_mfd_probe(struct platform_device *pdev)
{
struct wm97xx *wm;
struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
int ret;
wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
if (!wm)
return -ENOMEM;
wm->dev = &pdev->dev;
wm->ac97 = mfd_pdata->ac97;
ret = _wm97xx_probe(wm);
if (ret)
return ret;
ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
if (ret < 0)
goto batt_err;
return ret;
batt_err:
wm97xx_unregister_touch(wm);
return ret;
}
static int wm97xx_mfd_remove(struct platform_device *pdev)
{
return wm97xx_remove(&pdev->dev);
}
static int __maybe_unused wm97xx_suspend(struct device *dev)
{
struct wm97xx *wm = dev_get_drvdata(dev);
u16 reg;
int suspend_mode;
if (device_may_wakeup(&wm->input_dev->dev))
suspend_mode = wm->suspend_mode;
else
suspend_mode = 0;
if (wm->input_dev->users)
cancel_delayed_work_sync(&wm->ts_reader);
/* Power down the digitiser (bypassing the cache for resume) */
reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
reg &= ~WM97XX_PRP_DET_DIG;
if (wm->input_dev->users)
reg |= suspend_mode;
wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
/* WM9713 has an additional power bit - turn it off if there
* are no users or if suspend mode is zero. */
if (wm->id == WM9713_ID2 &&
(!wm->input_dev->users || !suspend_mode)) {
reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
}
return 0;
}
static int __maybe_unused wm97xx_resume(struct device *dev)
{
struct wm97xx *wm = dev_get_drvdata(dev);
/* restore digitiser and gpios */
if (wm->id == WM9713_ID2) {
wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
wm97xx_reg_write(wm, 0x5a, wm->misc);
if (wm->input_dev->users) {
u16 reg;
reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
}
}
wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
if (wm->input_dev->users && !wm->pen_irq) {
wm->ts_reader_interval = wm->ts_reader_min_interval;
queue_delayed_work(wm->ts_workq, &wm->ts_reader,
wm->ts_reader_interval);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
/*
* Machine specific operations
*/
int wm97xx_register_mach_ops(struct wm97xx *wm,
struct wm97xx_mach_ops *mach_ops)
{
mutex_lock(&wm->codec_mutex);
if (wm->mach_ops) {
mutex_unlock(&wm->codec_mutex);
return -EINVAL;
}
wm->mach_ops = mach_ops;
mutex_unlock(&wm->codec_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
void wm97xx_unregister_mach_ops(struct wm97xx *wm)
{
mutex_lock(&wm->codec_mutex);
wm->mach_ops = NULL;
mutex_unlock(&wm->codec_mutex);
}
EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
static struct device_driver wm97xx_driver = {
.name = "wm97xx-ts",
#ifdef CONFIG_AC97_BUS
.bus = &ac97_bus_type,
#endif
.owner = THIS_MODULE,
.probe = wm97xx_probe,
.remove = wm97xx_remove,
.pm = &wm97xx_pm_ops,
};
static struct platform_driver wm97xx_mfd_driver = {
.driver = {
.name = "wm97xx-ts",
.pm = &wm97xx_pm_ops,
},
.probe = wm97xx_mfd_probe,
.remove = wm97xx_mfd_remove,
};
static int __init wm97xx_init(void)
{
int ret;
ret = platform_driver_register(&wm97xx_mfd_driver);
if (ret)
return ret;
if (IS_BUILTIN(CONFIG_AC97_BUS))
ret = driver_register(&wm97xx_driver);
return ret;
}
static void __exit wm97xx_exit(void)
{
if (IS_BUILTIN(CONFIG_AC97_BUS))
driver_unregister(&wm97xx_driver);
platform_driver_unregister(&wm97xx_mfd_driver);
}
module_init(wm97xx_init);
module_exit(wm97xx_exit);
/* Module information */
MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
MODULE_LICENSE("GPL");