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/*
* 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<
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