2008-04-01 21:51:09 -07:00
|
|
|
/*
|
|
|
|
* 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
|
|
|
|
* liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
|
|
|
|
* 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/version.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/workqueue.h>
|
|
|
|
#include <linux/wm97xx.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/io.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.txt for more details.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int abs_x[3] = {350, 3900, 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] = {320, 3750, 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;
|
|
|
|
|
|
|
|
/* 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;
|
|
|
|
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;
|
|
|
|
|
|
|
|
mutex_unlock(&wm->codec_mutex);
|
|
|
|
return auxval & 0xfff;
|
|
|
|
}
|
|
|
|
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)
|
|
|
|
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);
|
|
|
|
|
2008-04-17 06:24:58 -07:00
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
|
2008-04-01 21:51:09 -07:00
|
|
|
/*
|
|
|
|
* 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)
|
|
|
|
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 availiable 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 upto 1ms to clear the interrupt source. We schedule a task
|
2008-04-17 06:24:39 -07:00
|
|
|
* 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.
|
2008-04-01 21:51:09 -07:00
|
|
|
*/
|
|
|
|
static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
|
|
|
|
{
|
|
|
|
struct wm97xx *wm = dev_id;
|
|
|
|
|
2008-04-17 06:24:39 -07:00
|
|
|
if (!work_pending(&wm->pen_event_work)) {
|
|
|
|
wm->mach_ops->irq_enable(wm, 0);
|
|
|
|
queue_work(wm->ts_workq, &wm->pen_event_work);
|
|
|
|
}
|
2008-04-01 21:51:09 -07:00
|
|
|
|
|
|
|
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);
|
|
|
|
|
2008-04-17 06:24:48 -07:00
|
|
|
if (request_irq(wm->pen_irq, wm97xx_pen_interrupt,
|
|
|
|
IRQF_SHARED | IRQF_SAMPLE_RANDOM,
|
2008-04-01 21:51:09 -07:00
|
|
|
"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_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);
|
|
|
|
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_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;
|
|
|
|
}
|
|
|
|
|
|
|
|
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 = create_singlethread_workqueue("kwm97xx");
|
|
|
|
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_probe(struct device *dev)
|
|
|
|
{
|
|
|
|
struct wm97xx *wm;
|
|
|
|
int ret = 0, id = 0;
|
|
|
|
|
|
|
|
wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
|
|
|
|
if (!wm)
|
|
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&wm->codec_mutex);
|
|
|
|
|
|
|
|
wm->dev = dev;
|
|
|
|
dev->driver_data = wm;
|
|
|
|
wm->ac97 = to_ac97_t(dev);
|
|
|
|
|
|
|
|
/* check that we have a supported codec */
|
|
|
|
id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
|
|
|
|
if (id != WM97XX_ID1) {
|
|
|
|
dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto alloc_err;
|
|
|
|
}
|
|
|
|
|
|
|
|
wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
|
|
|
|
|
|
|
|
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);
|
|
|
|
ret = -ENODEV;
|
|
|
|
goto alloc_err;
|
|
|
|
}
|
|
|
|
|
2008-05-26 22:37:19 -07:00
|
|
|
/* 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);
|
|
|
|
|
2008-04-01 21:51:09 -07:00
|
|
|
wm->input_dev = input_allocate_device();
|
|
|
|
if (wm->input_dev == NULL) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto alloc_err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* set up touch configuration */
|
|
|
|
wm->input_dev->name = "wm97xx touchscreen";
|
2008-05-26 22:36:47 -07:00
|
|
|
wm->input_dev->phys = "wm97xx";
|
2008-04-01 21:51:09 -07:00
|
|
|
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(ABS_X, wm->input_dev->absbit);
|
|
|
|
set_bit(ABS_Y, wm->input_dev->absbit);
|
|
|
|
set_bit(ABS_PRESSURE, wm->input_dev->absbit);
|
|
|
|
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 = dev;
|
|
|
|
ret = input_register_device(wm->input_dev);
|
|
|
|
if (ret < 0)
|
|
|
|
goto dev_alloc_err;
|
|
|
|
|
|
|
|
/* register our battery device */
|
|
|
|
wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
|
|
|
|
if (!wm->battery_dev) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto batt_err;
|
|
|
|
}
|
|
|
|
platform_set_drvdata(wm->battery_dev, wm);
|
|
|
|
wm->battery_dev->dev.parent = dev;
|
|
|
|
ret = platform_device_add(wm->battery_dev);
|
|
|
|
if (ret < 0)
|
|
|
|
goto batt_reg_err;
|
|
|
|
|
|
|
|
/* 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 = dev;
|
|
|
|
ret = platform_device_add(wm->touch_dev);
|
|
|
|
if (ret < 0)
|
|
|
|
goto touch_reg_err;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
touch_reg_err:
|
|
|
|
platform_device_put(wm->touch_dev);
|
|
|
|
touch_err:
|
|
|
|
platform_device_unregister(wm->battery_dev);
|
|
|
|
wm->battery_dev = NULL;
|
|
|
|
batt_reg_err:
|
|
|
|
platform_device_put(wm->battery_dev);
|
|
|
|
batt_err:
|
|
|
|
input_unregister_device(wm->input_dev);
|
|
|
|
wm->input_dev = NULL;
|
|
|
|
dev_alloc_err:
|
|
|
|
input_free_device(wm->input_dev);
|
|
|
|
alloc_err:
|
|
|
|
kfree(wm);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int wm97xx_remove(struct device *dev)
|
|
|
|
{
|
|
|
|
struct wm97xx *wm = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
platform_device_unregister(wm->battery_dev);
|
|
|
|
platform_device_unregister(wm->touch_dev);
|
|
|
|
input_unregister_device(wm->input_dev);
|
|
|
|
kfree(wm);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int wm97xx_suspend(struct device *dev, pm_message_t state)
|
|
|
|
{
|
|
|
|
struct wm97xx *wm = dev_get_drvdata(dev);
|
2008-04-17 06:24:58 -07:00
|
|
|
u16 reg;
|
|
|
|
int suspend_mode;
|
|
|
|
|
|
|
|
if (device_may_wakeup(&wm->input_dev->dev))
|
|
|
|
suspend_mode = wm->suspend_mode;
|
|
|
|
else
|
|
|
|
suspend_mode = 0;
|
2008-04-01 21:51:09 -07:00
|
|
|
|
|
|
|
if (wm->input_dev->users)
|
|
|
|
cancel_delayed_work_sync(&wm->ts_reader);
|
|
|
|
|
2008-04-17 06:24:58 -07:00
|
|
|
/* 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);
|
|
|
|
}
|
|
|
|
|
2008-04-01 21:51:09 -07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
#else
|
|
|
|
#define wm97xx_suspend NULL
|
|
|
|
#define wm97xx_resume NULL
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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 = {
|
2008-05-26 22:37:08 -07:00
|
|
|
.name = "wm97xx-ts",
|
2008-04-01 21:51:09 -07:00
|
|
|
.bus = &ac97_bus_type,
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.probe = wm97xx_probe,
|
|
|
|
.remove = wm97xx_remove,
|
|
|
|
.suspend = wm97xx_suspend,
|
|
|
|
.resume = wm97xx_resume,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init wm97xx_init(void)
|
|
|
|
{
|
|
|
|
return driver_register(&wm97xx_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit wm97xx_exit(void)
|
|
|
|
{
|
|
|
|
driver_unregister(&wm97xx_driver);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(wm97xx_init);
|
|
|
|
module_exit(wm97xx_exit);
|
|
|
|
|
|
|
|
/* Module information */
|
|
|
|
MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
|
|
|
|
MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
|
|
|
|
MODULE_LICENSE("GPL");
|