/*
* Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
*
* 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.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This is a driver for the EDT "Polytouch" family of touch controllers
* based on the FocalTech FT5x06 line of chips.
*
* Development of this driver has been sponsored by Glyn:
* http://www.glyn.com/Products/Displays
*/
#include <linux/module.h>
#include <linux/ratelimit.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/input/mt.h>
#include <linux/input/edt-ft5x06.h>
#define MAX_SUPPORT_POINTS 5
#define WORK_REGISTER_THRESHOLD 0x00
#define WORK_REGISTER_REPORT_RATE 0x08
#define WORK_REGISTER_GAIN 0x30
#define WORK_REGISTER_OFFSET 0x31
#define WORK_REGISTER_NUM_X 0x33
#define WORK_REGISTER_NUM_Y 0x34
#define WORK_REGISTER_OPMODE 0x3c
#define FACTORY_REGISTER_OPMODE 0x01
#define TOUCH_EVENT_DOWN 0x00
#define TOUCH_EVENT_UP 0x01
#define TOUCH_EVENT_ON 0x02
#define TOUCH_EVENT_RESERVED 0x03
#define EDT_NAME_LEN 23
#define EDT_SWITCH_MODE_RETRIES 10
#define EDT_SWITCH_MODE_DELAY 5 /* msec */
#define EDT_RAW_DATA_RETRIES 100
#define EDT_RAW_DATA_DELAY 1 /* msec */
struct edt_ft5x06_ts_data {
struct i2c_client *client;
struct input_dev *input;
u16 num_x;
u16 num_y;
#if defined(CONFIG_DEBUG_FS)
struct dentry *debug_dir;
u8 *raw_buffer;
size_t raw_bufsize;
#endif
struct mutex mutex;
bool factory_mode;
int threshold;
int gain;
int offset;
int report_rate;
char name[EDT_NAME_LEN];
};
static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
u16 wr_len, u8 *wr_buf,
u16 rd_len, u8 *rd_buf)
{
struct i2c_msg wrmsg[2];
int i = 0;
int ret;
if (wr_len) {
wrmsg[i].addr = client->addr;
wrmsg[i].flags = 0;
wrmsg[i].len = wr_len;
wrmsg[i].buf = wr_buf;
i++;
}
if (rd_len) {
wrmsg[i].addr = client->addr;
wrmsg[i].flags = I2C_M_RD;
wrmsg[i].len = rd_len;
wrmsg[i].buf = rd_buf;
i++;
}
ret = i2c_transfer(client->adapter, wrmsg, i);
if (ret < 0)
return ret;
if (ret != i)
return -EIO;
return 0;
}
static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
u8 *buf, int buflen)
{
int i;
u8 crc = 0;
for (i = 0; i < buflen - 1; i++)
crc ^= buf[i];
if (crc != buf[buflen-1]) {
dev_err_ratelimited(&tsdata->client->dev,
"crc error: 0x%02x expected, got 0x%02x\n",
crc, buf[buflen-1]);
return false;
}
return true;
}
static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
{
struct edt_ft5x06_ts_data *tsdata = dev_id;
struct device *dev = &tsdata->client->dev;
u8 cmd = 0xf9;
u8 rdbuf[26];
int i, type, x, y, id;
int error;
memset(rdbuf, 0, sizeof(rdbuf));
error = edt_ft5x06_ts_readwrite(tsdata->client,
sizeof(cmd), &cmd,
sizeof(rdbuf), rdbuf);
if (error) {
dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
error);
goto out;
}
if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
rdbuf[0], rdbuf[1], rdbuf[2]);
goto out;
}
if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
goto out;
for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
u8 *buf = &rdbuf[i * 4 + 5];
bool down;
type = buf[0] >> 6;
/* ignore Reserved events */
if (type == TOUCH_EVENT_RESERVED)
continue;
x = ((buf[0] << 8) | buf[1]) & 0x0fff;
y = ((buf[2] << 8) | buf[3]) & 0x0fff;
id = (buf[2] >> 4) & 0x0f;
down = (type != TOUCH_EVENT_UP);
input_mt_slot(tsdata->input, id);
input_