Hi Heiko,
you can find some annotations below.
Thanks,
-- chf
On Sat, 2011-12-03 at 15:09 +0100, Heiko Stübner wrote:
> Some displays from AUO have a so called in-cell touchscreen, meaning it
> is built directly into the display unit.
>
> Touchdata is gathered through PIXCIR Tango-ICs and processed in an
> Atmel ATmega168P with custom firmware. Communication between the host
> system and ATmega is done via I2C.
>
> Devices using this touch solution include the Dell Streak5 and the family
> of Qisda ebook readers.
>
> The driver reports single- and multi-touch events including touch area
> values.
>
> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx>
> ---
> drivers/input/touchscreen/Kconfig | 14 +
> drivers/input/touchscreen/Makefile | 1 +
> drivers/input/touchscreen/auo-pixcir-ts.c | 657 +++++++++++++++++++++++++++++
> include/linux/input/auo-pixcir-ts.h | 57 +++
> 4 files changed, 729 insertions(+), 0 deletions(-)
> create mode 100644 drivers/input/touchscreen/auo-pixcir-ts.c
> create mode 100644 include/linux/input/auo-pixcir-ts.h
>
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index 2b456a9..7da474e 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -98,6 +98,20 @@ config TOUCHSCREEN_ATMEL_MXT
> To compile this driver as a module, choose M here: the
> module will be called atmel_mxt_ts.
>
> +config TOUCHSCREEN_AUO_PIXCIR
> + tristate "AUO in-cell touchscreen using Pixcir ICs"
> + depends on I2C
> + depends on GPIOLIB
> + default n
> + help
> + Say Y here if you have a AUO display with in-cell touchscreen
> + using Pixcir ICs.
> +
> + If unsure, say N.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called auo-pixcir-ts.
> +
> config TOUCHSCREEN_BITSY
> tristate "Compaq iPAQ H3600 (Bitsy) touchscreen"
> depends on SA1100_BITSY
> diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
> index a09c546..f0b4d16 100644
> --- a/drivers/input/touchscreen/Makefile
> +++ b/drivers/input/touchscreen/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI) += ad7879-spi.o
> obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o
> obj-$(CONFIG_TOUCHSCREEN_ATMEL_MXT) += atmel_mxt_ts.o
> obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
> +obj-$(CONFIG_TOUCHSCREEN_AUO_PIXCIR) += auo-pixcir-ts.o
> obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
> obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o
> obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o
> diff --git a/drivers/input/touchscreen/auo-pixcir-ts.c b/drivers/input/touchscreen/auo-pixcir-ts.c
> new file mode 100644
> index 0000000..22ea042
> --- /dev/null
> +++ b/drivers/input/touchscreen/auo-pixcir-ts.c
> @@ -0,0 +1,657 @@
> +/* drivers/input/touchscreen/auo-pixcir-ts.c
> + *
> + * Copyright (c) 2011 Heiko Stuebner <heiko@xxxxxxxxx>
> + *
> + * loosely based on auo_touch.c from Dell Streak vendor-kernel
> + *
> + * Copyright (c) 2008 QUALCOMM Incorporated.
> + * Copyright (c) 2008 QUALCOMM USA, INC.
> + *
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/interrupt.h>
> +#include <linux/slab.h>
> +#include <linux/input.h>
> +#include <linux/platform_device.h>
> +#include <linux/jiffies.h>
> +#include <linux/io.h>
> +#include <linux/uaccess.h>
> +#include <linux/miscdevice.h>
> +#include <linux/i2c.h>
> +#include <linux/semaphore.h>
> +#include <linux/delay.h>
> +#include <linux/gpio.h>
> +#include <linux/input/auo-pixcir-ts.h>
> +
> +/*
> + * Coordinate calculation:
> + * X1 = X1_LSB + X1_MSB*256
> + * Y1 = Y1_LSB + Y1_MSB*256
> + * X2 = X2_LSB + X2_MSB*256
> + * Y2 = Y2_LSB + Y2_MSB*256
> + */
> +#define AUO_PIXCIR_REG_X1_LSB 0x00
> +#define AUO_PIXCIR_REG_X1_MSB 0x01
> +#define AUO_PIXCIR_REG_Y1_LSB 0x02
> +#define AUO_PIXCIR_REG_Y1_MSB 0x03
> +#define AUO_PIXCIR_REG_X2_LSB 0x04
> +#define AUO_PIXCIR_REG_X2_MSB 0x05
> +#define AUO_PIXCIR_REG_Y2_LSB 0x06
> +#define AUO_PIXCIR_REG_Y2_MSB 0x07
> +
> +#define AUO_PIXCIR_REG_STRENGTH 0x0d
> +#define AUO_PIXCIR_REG_STRENGTH_X1_LSB 0x0e
> +#define AUO_PIXCIR_REG_STRENGTH_X1_MSB 0x0f
> +
> +#define AUO_PIXCIR_REG_RAW_DATA_X 0x2b
> +#define AUO_PIXCIR_REG_RAW_DATA_Y 0x4f
> +
> +#define AUO_PIXCIR_REG_X_SENSITIVITY 0x6f
> +#define AUO_PIXCIR_REG_Y_SENSITIVITY 0x70
> +#define AUO_PIXCIR_REG_INT_SETTING 0x71
> +#define AUO_PIXCIR_REG_INT_WIDTH 0x72
> +#define AUO_PIXCIR_REG_POWER_MODE 0x73
> +
> +#define AUO_PIXCIR_REG_VERSION 0x77
> +#define AUO_PIXCIR_REG_CALIBRATE 0x78
> +
> +#define AUO_PIXCIR_REG_TOUCHAREA_X1 0x1e
> +#define AUO_PIXCIR_REG_TOUCHAREA_Y1 0x1f
> +#define AUO_PIXCIR_REG_TOUCHAREA_X2 0x20
> +#define AUO_PIXCIR_REG_TOUCHAREA_Y2 0x21
> +
> +#define AUO_PIXCIR_REG_EEPROM_CALIB_X 0x42
> +#define AUO_PIXCIR_REG_EEPROM_CALIB_Y 0xad
> +
> +#define AUO_PIXCIR_INT_TPNUM_MASK 0xe0
> +#define AUO_PIXCIR_INT_TPNUM_SHIFT 5
> +#define AUO_PIXCIR_INT_RELEASE (1 << 4)
> +#define AUO_PIXCIR_INT_ENABLE (1 << 3)
> +#define AUO_PIXCIR_INT_POL_HIGH (1 << 2)
> +#define AUO_PIXCIR_INT_MODE_MASK 0x03
> +
> +/*
> + * Power modes:
> + * active: scan speed 60Hz
> + * sleep: scan speed 10Hz can be auto-activated, wakeup on 1st touch
> + * deep sleep: scan speed 1Hz can only be entered or left manually.
> + */
> +#define AUO_PIXCIR_POWER_ACTIVE 0x00
> +#define AUO_PIXCIR_POWER_SLEEP 0x01
> +#define AUO_PIXCIR_POWER_DEEP_SLEEP 0x02
> +#define AUO_PIXCIR_POWER_MASK 0x03
> +
> +#define AUO_PIXCIR_POWER_ALLOW_SLEEP (1 << 2)
> +#define AUO_PIXCIR_POWER_IDLE_TIME(ms) ((ms & 0xf) << 4)
> +
> +#define AUO_PIXCIR_CALIBRATE 0x03
> +
> +#define AUO_PIXCIR_EEPROM_CALIB_X_LEN 62
> +#define AUO_PIXCIR_EEPROM_CALIB_Y_LEN 36
> +
> +#define AUO_PIXCIR_RAW_DATA_X_LEN 18
> +#define AUO_PIXCIR_RAW_DATA_Y_LEN 11
> +
> +#define AUO_PIXCIR_STRENGTH_ENABLE (1 << 0)
> +
> +/* Touchscreen absolute values */
> +#define AUO_PIXCIR_REPORT_POINTS 2
> +#define AUO_PIXCIR_MAX_AREA 0xff
> +#define AUO_PIXCIR_PENUP_TIMEOUT_MS 10
> +
> +struct auo_pixcir_ts {
> + struct i2c_client *client;
> + struct input_dev *input;
> + char phys[32];
> +
> + /* special handling for touch_indicate interupt mode */
> + bool touch_ind_mode;
> +
> + wait_queue_head_t wait;
> + bool stopped;
> + bool is_open;
> +};
> +
> +struct auo_point_t {
> + int coord_x;
> + int coord_y;
> + int area_major;
> + int area_minor;
> + int orientation;
> +};
> +
> +static int auo_pixcir_collect_data(struct auo_pixcir_ts *ts,
> + struct auo_point_t *point)
> +{
> + struct i2c_client *client = ts->client;
> + struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
> + uint8_t raw_coord[8];
> + uint8_t raw_area[4];
> + int i, ret;
> +
> + /* touch coordinates */
> + ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_X1_LSB,
> + 8, raw_coord);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to read coordinate, %d\n", ret);
> + return ret;
> + }
> +
> + /* touch area */
> + ret = i2c_smbus_read_i2c_block_data(client, AUO_PIXCIR_REG_TOUCHAREA_X1,
> + 4, raw_area);
> + if (ret < 0) {
> + dev_err(&client->dev, "could not read touch area, %d\n", ret);
> + return ret;
> + }
> +
> + for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
> + point[i].coord_x = raw_coord[4*i+1] << 8 | raw_coord[4*i];
> + point[i].coord_y = raw_coord[4*i+3] << 8 | raw_coord[4*i+2];
> +
> + if (point[i].coord_x > pdata->x_max ||
> + point[i].coord_y > pdata->y_max) {
> + dev_warn(&client->dev, "coordinates (%d,%d) invalid\n",
> + point[i].coord_x, point[i].coord_y);
> + point[i].coord_x = point[i].coord_y = 0;
> + }
> +
> + /* determine touch major, minor and orientation */
> + point[i].area_major = max(raw_area[2*i], raw_area[2*i+1]);
> + point[i].area_minor = min(raw_area[2*i], raw_area[2*i+1]);
> + point[i].orientation = (raw_area[2*i] > raw_area[2*i+1]);
> + }
> +
> + return 0;
> +}
> +
> +static irqreturn_t auo_pixcir_interrupt(int irq, void *dev_id)
> +{
> + struct auo_pixcir_ts *ts = dev_id;
> + struct i2c_client *client = ts->client;
> + struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
> + struct auo_point_t point[AUO_PIXCIR_REPORT_POINTS];
> + int i;
> + int ret;
> + int fingers = 0;
> + int abs = -1;
> +
> + while (!ts->stopped) {
> +
> + /* check for up event in touch touch_ind_mode */
> + if (ts->touch_ind_mode) {
> + if (gpio_get_value(pdata->gpio_int) == 0) {
> + input_mt_sync(ts->input);
> + input_report_key(ts->input, BTN_TOUCH, 0);
> + input_sync(ts->input);
> + break;
> + }
> + }
> +
> + ret = auo_pixcir_collect_data(ts, point);
> + if (ret < 0) {
> + /* we want to loop only in touch_ind_mode */
> + if (!ts->touch_ind_mode)
> + break;
> +
> + wait_event_timeout(ts->wait, ts->stopped,
> + msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
> + continue;
> + }
> +
> + for (i = 0; i < AUO_PIXCIR_REPORT_POINTS; i++) {
> + if (point[i].coord_x > 0 || point[i].coord_y > 0) {
> + input_report_abs(ts->input, ABS_MT_POSITION_X,
> + point[i].coord_x);
> + input_report_abs(ts->input, ABS_MT_POSITION_Y,
> + point[i].coord_y);
> + input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR,
> + point[i].area_major);
> + input_report_abs(ts->input, ABS_MT_TOUCH_MINOR,
> + point[i].area_minor);
> + input_report_abs(ts->input, ABS_MT_ORIENTATION,
> + point[i].orientation);
> + input_mt_sync(ts->input);
> +
> + /* use first finger as source for singletouch */
> + if (fingers == 0)
> + abs = i;
> +
> + /* number of touch points could also be queried
> + * via i2c but would require an additional call
> + */
> + fingers++;
> + }
> + }
> +
> + input_report_key(ts->input, BTN_TOUCH, fingers > 0);
> +
> + if (abs > -1) {
> + input_report_abs(ts->input, ABS_X, point[abs].coord_x);
> + input_report_abs(ts->input, ABS_Y, point[abs].coord_y);
> + }
> +
> + input_sync(ts->input);
> +
> + /* we want to loop only in touch_ind_mode */
> + if (!ts->touch_ind_mode)
> + break;
> +
> + wait_event_timeout(ts->wait, ts->stopped,
> + msecs_to_jiffies(AUO_PIXCIR_PENUP_TIMEOUT_MS));
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +/*
> + * Set the power mode of the device.
> + * Valid modes are
> + * - AUO_PIXCIR_POWER_ACTIVE
> + * - AUO_PIXCIR_POWER_SLEEP - automatically left on first touch
> + * - AUO_PIXCIR_POWER_DEEP_SLEEP
> + */
> +static int auo_pixcir_power_mode(struct auo_pixcir_ts *ts, int mode)
> +{
> + struct i2c_client *client = ts->client;
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_POWER_MODE);
> + if (ret < 0) {
> + dev_err(&client->dev, "unable to read reg %Xh, %d\n",
> + AUO_PIXCIR_REG_POWER_MODE, ret);
> + return ret;
> + }
> +
> + ret &= (~AUO_PIXCIR_POWER_MASK);
> + ret |= mode;
> +
> + ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_POWER_MODE, ret);
> + if (ret) {
> + dev_err(&client->dev, "unable to write reg %Xh, %d\n",
> + AUO_PIXCIR_REG_POWER_MODE, ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int auo_pixcir_int_config(struct auo_pixcir_ts *ts, int int_setting)
> +{
> + struct i2c_client *client = ts->client;
> + struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
> + uint8_t value;
> +
> + value = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
> + if (value < 0) {
value is an unsigned int and can't be less than zero. An int value would
be more appropriate.
> + dev_err(&client->dev, "unable to read reg %Xh, %d\n",
> + AUO_PIXCIR_REG_INT_SETTING, value);
> + return value;
> + }
> +
> + value &= (~AUO_PIXCIR_INT_MODE_MASK);
> + value |= int_setting;
> + value |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
> +
> + value = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
> + value);
> + if (value < 0) {
the same here
> + dev_err(&client->dev, "unable to write reg %Xh, %d\n",
> + AUO_PIXCIR_REG_INT_SETTING, value);
> + return value;
> + }
> +
> + if (pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND)
> + ts->touch_ind_mode = 1;
> + else
> + ts->touch_ind_mode = 0;
> +
> + return 0;
> +}
> +
> +/* controll the generation of interrupts on the device side */
> +static int auo_pixcir_int_enable(struct auo_pixcir_ts *ts, int enable)
> +{
> + struct i2c_client *client = ts->client;
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_INT_SETTING);
> + if (ret < 0) {
> + dev_err(&client->dev, "unable to read reg %Xh, %d\n",
> + AUO_PIXCIR_REG_INT_SETTING, ret);
> + disable_irq(client->irq);
> + return ret;
> + }
> +
> + if (enable)
> + ret |= AUO_PIXCIR_INT_ENABLE;
> + else
> + ret &= ~AUO_PIXCIR_INT_ENABLE;
> +
> + ret = i2c_smbus_write_byte_data(client, AUO_PIXCIR_REG_INT_SETTING,
> + ret);
> + if (ret < 0) {
> + dev_err(&client->dev, "unable to write reg %Xh, %d\n",
> + AUO_PIXCIR_REG_INT_SETTING, ret);
> + disable_irq(client->irq);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int auo_pixcir_start(struct auo_pixcir_ts *ts)
> +{
> + struct i2c_client *client = ts->client;
> + int ret;
> +
> + ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_ACTIVE);
> + if (ret < 0) {
> + dev_err(&client->dev, "could not set power mode, %d\n",
> + ret);
> + return ret;
> + }
> +
> + ts->stopped = false;
> + mb();
> + enable_irq(client->irq);
> +
> + ret = auo_pixcir_int_enable(ts, 1);
> + if (ret < 0) {
> + dev_err(&client->dev, "could not enable interrupt, %d\n",
> + ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int auo_pixcir_stop(struct auo_pixcir_ts *ts)
> +{
> + struct i2c_client *client = ts->client;
> + int ret;
> +
> + ret = auo_pixcir_int_enable(ts, 0);
> + if (ret < 0) {
> + dev_err(&client->dev, "could not disable interrupt, %d\n",
> + ret);
> + return ret;
> + }
> +
> + /* disable receiving of interrupts */
> + disable_irq(client->irq);
> + ts->stopped = true;
> + mb();
> + wake_up(&ts->wait);
> +
> + return auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_DEEP_SLEEP);
> +}
> +
> +static int auo_pixcir_input_open(struct input_dev *dev)
> +{
> + struct auo_pixcir_ts *ts = input_get_drvdata(dev);
> + int ret;
> +
> + ret = auo_pixcir_start(ts);
> + if (ret)
> + return ret;
> +
> + ts->is_open = true;
> +
> + return 0;
> +}
> +
> +static void auo_pixcir_input_close(struct input_dev *dev)
> +{
> + struct auo_pixcir_ts *ts = input_get_drvdata(dev);
> +
> + ts->is_open = false;
> +
> + auo_pixcir_stop(ts);
> +
> + return;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int auo_pixcir_suspend(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct auo_pixcir_ts *ts = (struct auo_pixcir_ts *)
> + i2c_get_clientdata(client);
> +
> + /* if device isn't open it's stopped already */
> + if (ts->is_open) {
> + if (device_may_wakeup(&client->dev)) {
> + enable_irq_wake(client->irq);
> + return auo_pixcir_power_mode(ts,
> + AUO_PIXCIR_POWER_SLEEP);
> + } else {
> + auo_pixcir_stop(ts);
> + }
> + }
> +
> + return 0;
> +}
> +
> +static int auo_pixcir_resume(struct device *dev)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct auo_pixcir_ts *ts = (struct auo_pixcir_ts *)
> + i2c_get_clientdata(client);
> +
> + /* if device isn't open it was stopped and should stay that way */
> + if (ts->is_open) {
> + if (device_may_wakeup(&client->dev)) {
> + disable_irq_wake(client->irq);
> + /* automatic wakeup on first-touch */
> + } else if (ts->is_open) {
> + return auo_pixcir_start(ts);
> + }
> + }
> +
> + return 0;
> +}
> +
> +SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, auo_pixcir_suspend, auo_pixcir_resume);
> +#endif
> +
> +static int __devinit auo_pixcir_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct auo_pixcir_ts *ts;
> + struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
> + struct input_dev *input_dev;
> + int ret;
> +
> + if (!pdata)
> + return -EINVAL;
> +
> + ts = kzalloc(sizeof(struct auo_pixcir_ts), GFP_KERNEL);
> + if (!ts)
> + return -ENOMEM;
> +
> + ret = gpio_request(pdata->gpio_int, "auo_pixcir_ts_int");
> + if (ret) {
> + dev_err(&client->dev, "request of gpio %d failed, %d\n",
> + pdata->gpio_int, ret);
> + goto err_gpio_int;
> + }
> +
> + ret = gpio_request(pdata->gpio_rst, "auo_pixcir_ts_rst");
> + if (ret) {
> + dev_err(&client->dev, "request of gpio %d failed, %d\n",
> + pdata->gpio_int, ret);
> + goto err_gpio_rst;
> + }
> +
> + if (pdata->init_hw)
> + pdata->init_hw();
> +
> + ts->client = client;
> + ts->touch_ind_mode = 0;
> + init_waitqueue_head(&ts->wait);
> +
> + snprintf(ts->phys, sizeof(ts->phys),
> + "%s/input0", dev_name(&client->dev));
> +
> + input_dev = input_allocate_device();
> + if (!input_dev) {
> + dev_err(&client->dev, "could not allocate input device\n");
> + goto err_input_alloc;
> + }
> +
> + ts->input = input_dev;
> +
> + input_dev->name = "auo_pixcir_ts";
> + input_dev->phys = ts->phys;
> + input_dev->id.bustype = BUS_I2C;
> + input_dev->dev.parent = &client->dev;
> +
> + input_dev->open = auo_pixcir_input_open;
> + input_dev->close = auo_pixcir_input_close;
> +
> + __set_bit(EV_ABS, input_dev->evbit);
> + __set_bit(EV_KEY, input_dev->evbit);
> +
> + __set_bit(BTN_TOUCH, input_dev->keybit);
> +
> + /* For single touch */
> + input_set_abs_params(input_dev, ABS_X, 0, pdata->x_max, 0, 0);
> + input_set_abs_params(input_dev, ABS_Y, 0, pdata->y_max, 0, 0);
> +
> + /* For multi touch */
> + input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0,
> + pdata->x_max, 0, 0);
> + input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0,
> + pdata->y_max, 0, 0);
> + input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
> + AUO_PIXCIR_MAX_AREA, 0, 0);
> + input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0,
> + AUO_PIXCIR_MAX_AREA, 0, 0);
> + input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0);
> +
> + ret = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
> + if (ret < 0)
> + goto err_fw_vers;
> + dev_info(&client->dev, "firmware version 0x%X\n", ret);
> +
> + ret = auo_pixcir_int_config(ts, pdata->int_setting);
> + if (ret)
> + goto err_fw_vers;
> +
> + /* disable irqs on the device side before irq-request */
> + auo_pixcir_int_enable(ts, 0);
> + ts->stopped = true;
> + ts->is_open = false;
> +
> + ret = request_threaded_irq(client->irq, NULL, auo_pixcir_interrupt,
> + IRQF_TRIGGER_RISING | IRQF_ONESHOT,
> + input_dev->name, ts);
> + if (ret) {
> + dev_err(&client->dev, "irq %d requested failed\n", client->irq);
> + goto err_fw_vers;
> + }
> +
> + /* stop device and put it into deep sleep until it is opened */
> + ret = auo_pixcir_stop(ts);
> + if (ret < 0)
> + goto err_input_register;
> +
> + ret = input_register_device(input_dev);
> + if (ret) {
> + dev_err(&client->dev, "could not register input device\n");
> + goto err_input_register;
> + }
> +
> + input_set_drvdata(ts->input, ts);
> +
> + i2c_set_clientdata(client, ts);
> +
> + return 0;
> +
> +err_input_register:
> + free_irq(client->irq, ts);
> +err_fw_vers:
> + input_free_device(input_dev);
> +err_input_alloc:
> + if (pdata->exit_hw)
> + pdata->exit_hw();
> + gpio_free(pdata->gpio_rst);
> +err_gpio_rst:
> + gpio_free(pdata->gpio_int);
> +err_gpio_int:
> + kfree(ts);
> +
> + return ret;
> +}
> +
> +static int __devexit auo_pixcir_remove(struct i2c_client *client)
> +{
> + struct auo_pixcir_ts *ts = (struct auo_pixcir_ts *)
> + i2c_get_clientdata(client);
> + struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
> +
> + auo_pixcir_stop(ts);
> +
> + free_irq(client->irq, ts);
> +
> + input_unregister_device(ts->input);
> + input_free_device(ts->input);
to quote input.c:
/**
* input_free_device - free memory occupied by input_dev structure
* @dev: input device to free
*
* This function should only be used if input_register_device()
* was not called yet or if it failed. Once device was registered
* use input_unregister_device() and memory will be freed once last
* reference to the device is dropped.
*
* Device should be allocated by input_allocate_device().
*
* NOTE: If there are references to the input device then memory
* will not be freed until last reference is dropped.
*/
the same applies to the error path in auo_pixcir_probe()
> +
> + if (pdata->exit_hw)
> + pdata->exit_hw();
> +
> + gpio_free(pdata->gpio_int);
> + gpio_free(pdata->gpio_rst);
> +
> + kfree(ts);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id auo_pixcir_idtable[] = {
> + { "auo_pixcir_ts", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
> +
> +static struct i2c_driver auo_pixcir_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = "auo_pixcir_ts",
> +#ifdef CONFIG_PM
> + .pm = &auo_pixcir_pm_ops,
> +#endif
> + },
> + .probe = auo_pixcir_probe,
> + .remove = __devexit_p(auo_pixcir_remove),
> + .id_table = auo_pixcir_idtable,
> +};
> +
> +static int __init auo_pixcir_init(void)
> +{
> + return i2c_add_driver(&auo_pixcir_driver);
> +}
> +module_init(auo_pixcir_init);
> +
> +static void __exit auo_pixcir_exit(void)
> +{
> + i2c_del_driver(&auo_pixcir_driver);
> +}
> +module_exit(auo_pixcir_exit);
> +
> +MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Heiko Stuebner <heiko@xxxxxxxxx>");
> diff --git a/include/linux/input/auo-pixcir-ts.h b/include/linux/input/auo-pixcir-ts.h
> new file mode 100644
> index 0000000..d4221be
> --- /dev/null
> +++ b/include/linux/input/auo-pixcir-ts.h
> @@ -0,0 +1,57 @@
> +/* drivers/input/touchscreen/auo-pixcir-ts.h
> + *
> + * Copyright (c) 2011 Heiko Stuebner <heiko@xxxxxxxxx>
> + *
> + * based on auo_touch.h from Dell Streak kernel
> + *
> + * Copyright (c) 2008 QUALCOMM Incorporated.
> + * Copyright (c) 2008 QUALCOMM USA, INC.
> + *
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * 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.
> + *
> + */
> +
> +#ifndef __AUO_PIXCIR_TS_H__
> +#define __AUO_PIXCIR_TS_H__
> +
> +/*
> + * Interrupt modes:
> + * periodical: interrupt is asserted periodicaly
> + * compare coordinates: interrupt is asserted when coordinates change
> + * indicate touch: interrupt is asserted during touch
> + */
> +#define AUO_PIXCIR_INT_PERIODICAL 0x00
> +#define AUO_PIXCIR_INT_COMP_COORD 0x01
> +#define AUO_PIXCIR_INT_TOUCH_IND 0x02
> +
> +/*
> + * @gpio_int interrupt gpio
> + * @gpio_rst reset gpio, used in init_hw and exit_hw
> + * @int_setting one of AUO_PIXCIR_INT_*
> + * @init_hw hardwarespecific init
> + * @exit_hw hardwarespecific shutdown
> + * @x_max x-resolution
> + * @y_max y-resolution
> + */
> +struct auo_pixcir_ts_platdata {
> + int gpio_int;
> + int gpio_rst;
> +
> + int int_setting;
> +
> + void (*init_hw)(void);
> + void (*exit_hw)(void);
> +
> + unsigned int x_max;
> + unsigned int y_max;
> +};
> +
> +#endif
--
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