- 根目录:
- drivers
- input
- touchscreen
- auo-pixcir-ts.c
/*
* Driver for AUO in-cell touchscreens
*
* Copyright (c) 2011 Heiko Stuebner <heiko@sntech.de>
*
* 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/jiffies.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/input/auo-pixcir-ts.h>
#include <linux/of.h>
#include <linux/of_gpio.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;
const struct auo_pixcir_ts_platdata *pdata;
char phys[32];
/* special handling for touch_indicate interupt mode */
bool touch_ind_mode;
wait_queue_head_t wait;
bool stopped;
};
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;
const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
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;
const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
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;
const struct auo_pixcir_ts_platdata *pdata = ts->pdata;
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);
return ret;
}
ret &= ~AUO_PIXCIR_INT_MODE_MASK;
ret |= int_setting;
ret |= AUO_PIXCIR_INT_POL_HIGH; /* always use high for interrupts */
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);
return ret;
}
ts->touch_ind_mode = pdata->int_setting == AUO_PIXCIR_INT_TOUCH_IND;
return 0;
}
/* control the generation of interrupts on the device side */
static int auo_pixcir_int_toggle(struct auo_pixcir_ts *ts, bool 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);
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);
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_toggle(ts, 1);
if (ret < 0) {
dev_err(&client->dev, "could not enable interrupt, %d\n",
ret);
disable_irq(client->irq);
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_toggle(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;
return 0;
}
static void auo_pixcir_input_close(struct input_dev *dev)
{
struct auo_pixcir_ts *ts = input_get_drvdata(dev);
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 = i2c_get_clientdata(client);
struct input_dev *input = ts->input;
int ret = 0;
mutex_lock(&input->mutex);
/* when configured as wakeup source, device should always wake system
* therefore start device if necessary
*/
if (device_may_wakeup(&client->dev)) {
/* need to start device if not open, to be wakeup source */
if (!input->users) {
ret = auo_pixcir_start(ts);
if (ret)
goto unlock;
}
enable_irq_wake(client->irq);
ret = auo_pixcir_power_mode(ts, AUO_PIXCIR_POWER_SLEEP);
} else if (input->users) {
ret = auo_pixcir_stop(ts);
}
unlock:
mutex_unlock(&input->mutex);
return ret;
}
static int auo_pixcir_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct auo_pixcir_ts *ts = i2c_get_clientdata(client);
struct input_dev *input = ts->input;
int ret = 0;
mutex_lock(&input->mutex);
if (device_may_wakeup(&client->dev)) {
disable_irq_wake(client->irq);
/* need to stop device if it was not open on suspend */
if (!input->users) {
ret = auo_pixcir_stop(ts);
if (ret)
goto unlock;
}
/* device wakes automatically from SLEEP */
} else if (input->users) {
ret = auo_pixcir_start(ts);
}
unlock:
mutex_unlock(&input->mutex);
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
auo_pixcir_suspend, auo_pixcir_resume);
#ifdef CONFIG_OF
static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
{
struct auo_pixcir_ts_platdata *pdata;
struct device_node *np = dev->of_node;
if (!np)
return ERR_PTR(-ENOENT);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "failed to allocate platform data\n");
return ERR_PTR(-ENOMEM);
}
pdata->gpio_int = of_get_gpio(np, 0);
if (!gpio_is_valid(pdata->gpio_int)) {
dev_err(dev, "failed to get interrupt gpio\n");
return ERR_PTR(-EINVAL);
}
pdata->gpio_rst = of_get_gpio(np, 1);
if (!gpio_is_valid(pdata->gpio_rst)) {
dev_err(dev, "failed to get reset gpio\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
dev_err(dev, "failed to get x-size property\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
dev_err(dev, "failed to get y-size property\n");
return ERR_PTR(-EINVAL);
}
/* default to asserting the interrupt when the screen is touched */
pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
return pdata;
}
#else
static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
{
return ERR_PTR(-EINVAL);
}
#endif
static void auo_pixcir_reset(void *data)
{
struct auo_pixcir_ts *ts = data;
gpio_set_value(ts->pdata->gpio_rst, 0);
}
static int auo_pixcir_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct auo_pixcir_ts_platdata *pdata;
struct auo_pixcir_ts *ts;
struct input_dev *input_dev;
int version;
int error;
pdata = dev_get_platdata(&client->dev);
if (!pdata) {
pdata = auo_pixcir_parse_dt(&client->dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
ts = devm_kzalloc(&client->dev,
sizeof(struct auo_pixcir_ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
input_dev = devm_input_allocate_device(&client->dev);
if (!input_dev) {
dev_err(&client->dev, "could not allocate input device\n");
return -ENOMEM;
}
ts->pdata = pdata;
ts->client = client;
ts->input = input_dev;
ts->touch_ind_mode = 0;
ts->stopped = true;
init_waitqueue_head(&ts->wait);
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
input_dev->name = "AUO-Pixcir touchscreen";
input_dev->phys = ts->phys;
input_dev->id.bustype = BUS_I2C;
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);
input_set_drvdata(ts->input, ts);
error = devm_gpio_request_one(&client->dev, pdata->gpio_int,
GPIOF_DIR_IN, "auo_pixcir_ts_int");
if (error) {
dev_err(&client->dev, "request of gpio %d failed, %d\n",
pdata->gpio_int, error);
return error;
}
error = devm_gpio_request_one(&client->dev, pdata->gpio_rst,
GPIOF_DIR_OUT | GPIOF_INIT_HIGH,
"auo_pixcir_ts_rst");
if (error) {
dev_err(&client->dev, "request of gpio %d failed, %d\n",
pdata->gpio_rst, error);
return error;
}
error = devm_add_action(&client->dev, auo_pixcir_reset, ts);
if (error) {
auo_pixcir_reset(ts);
dev_err(&client->dev, "failed to register reset action, %d\n",
error);
return error;
}
msleep(200);
version = i2c_smbus_read_byte_data(client, AUO_PIXCIR_REG_VERSION);
if (version < 0) {
error = version;
return error;
}
dev_info(&client->dev, "firmware version 0x%X\n", version);
error = auo_pixcir_int_config(ts, pdata->int_setting);
if (error)
return error;
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, auo_pixcir_interrupt,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
input_dev->name, ts);
if (error) {
dev_err(&client->dev, "irq %d requested failed, %d\n",
client->irq, error);
return error;
}
/* stop device and put it into deep sleep until it is opened */
error = auo_pixcir_stop(ts);
if (error)
return error;
error = input_register_device(input_dev);
if (error) {
dev_err(&client->dev, "could not register input device, %d\n",
error);
return error;
}
i2c_set_clientdata(client, ts);
return 0;
}
static const struct i2c_device_id auo_pixcir_idtable[] = {
{ "auo_pixcir_ts", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
#ifdef CONFIG_OF
static struct of_device_id auo_pixcir_ts_dt_idtable[] = {
{ .compatible = "auo,auo_pixcir_ts" },
{},
};
MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
#endif
static struct i2c_driver auo_pixcir_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "auo_pixcir_ts",
.pm = &auo_pixcir_pm_ops,
.of_match_table = of_match_ptr(auo_pixcir_ts_dt_idtable),
},
.probe = auo_pixcir_probe,
.id_table = auo_pixcir_idtable,
};
module_i2c_driver(auo_pixcir_driver);
MODULE_DESCRIPTION("AUO-PIXCIR touchscreen driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>");