/*
* Driver for cypress touch screen controller
*
* Copyright (c) 2009 Aava Mobile
*
* Some cleanups by Alan Cox <alan@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/input/cy8ctmg110_pdata.h>
#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
/* Touch coordinates */
#define CY8CTMG110_X_MIN 0
#define CY8CTMG110_Y_MIN 0
#define CY8CTMG110_X_MAX 759
#define CY8CTMG110_Y_MAX 465
/* cy8ctmg110 register definitions */
#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
#define CY8CTMG110_TOUCH_SLEEP_TIME 2
#define CY8CTMG110_TOUCH_X1 3
#define CY8CTMG110_TOUCH_Y1 5
#define CY8CTMG110_TOUCH_X2 7
#define CY8CTMG110_TOUCH_Y2 9
#define CY8CTMG110_FINGERS 11
#define CY8CTMG110_GESTURE 12
#define CY8CTMG110_REG_MAX 13
/*
* The touch driver structure.
*/
struct cy8ctmg110 {
struct input_dev *input;
char phys[32];
struct i2c_client *client;
int reset_pin;
int irq_pin;
};
/*
* cy8ctmg110_power is the routine that is called when touch hardware
* will powered off or on.
*/
static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
{
if (ts->reset_pin)
gpio_direction_output(ts->reset_pin, 1 - poweron);
}
static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
unsigned char len, unsigned char *value)
{
struct i2c_client *client = tsc->client;
int ret;
unsigned char i2c_data[6];
BUG_ON(len > 5);
i2c_data[0] = reg;
memcpy(i2c_data + 1, value, len);
ret = i2c_master_send(client, i2c_data, len + 1);
if (ret != 1) {
dev_err(&client->dev, "i2c write data cmd failed\n");
return ret ? ret : -EIO;
}
return 0;
}
static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
unsigned char *data, unsigned char len, unsigned char cmd)
{
struct i2c_client *client = tsc->client;
int ret;
struct i2c_msg msg[2] = {
/* first write slave position to i2c devices */
{ client->addr, 0, 1, &cmd },
/* Second read data from position */
{ client->addr, I2C_M_RD, len, data }
};
ret = i2c_transfer(client->adapter, msg, 2);
if (ret < 0)
return ret;
return 0;
}
static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
{
struct input_dev *input = tsc->input;
unsigned char reg_p[CY8CTMG110_REG_MAX];
int x, y;
memset(reg_p, 0, CY8CTMG110_REG_MAX);
/* Reading coordinates */
if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
return -EIO;
y = reg_p[2] << 8 | reg_p[3];
x = reg_p[0] << 8 | reg_p[1];
/* Number of touch */
if (reg_p[8] == 0) {
input_report_key(input, BTN_TOUCH, 0);
} else {
input_report_key(input, BTN_TOUCH, 1);
input_report_abs(input, ABS_X, x);
input_report_abs(input, ABS_Y, y);
}
input_sync(input);
return 0;
}
static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
{
unsigned char reg_p[3];
if (sleep) {
reg_p[0] = 0x00;
reg_p[1] = 0xff;
reg_p[2] = 5;
} else {
reg_p[0] = 0x10;
reg_p[1] = 0xff;
reg_p[2] = 0;
}
return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
}
static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
{
struct cy8ctmg110 *tsc = dev_id;
cy8ctmg110_touch_pos(tsc);
return IRQ_HANDLED;
}
static int __devinit cy8ctmg110_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
struct cy8ctmg110 *ts;
struct input_dev *input_dev;
int err;
/* No pdata no way forward */
if (pdata == NULL) {
dev_err(&client->dev, "no pdata\n");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -EIO;
ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
input_dev = input_allocate_device();
if (!ts || !input_dev) {
err = -ENOMEM;
goto err_free_mem;
}
ts->client = client;
ts->input = input_dev;
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
input_dev->phys = ts->phys;
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = &client->dev;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X,
CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
input_set_abs_params(input_dev, ABS_Y,
CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
if (ts->reset_pin) {
err = gpio_request(ts->reset_pin, NULL);
if (err) {
dev_err(&client->dev,
"Unable to request GPIO pin %d.\n",
ts->reset_pin);
goto err_free_mem;
}
}
cy8ctmg110_power(ts, true);
cy8ctmg110_set_sleepmode(ts, false);
err = gpio_request(ts->irq_pin, "touch_irq_key");
if (err < 0) {
dev_err(&client->dev,
"Failed to request GPIO %d, error %d\n",
ts->irq_pin, err);
goto err_shutoff_device;
}
err = gpio_direction_input(ts->irq_pin);
if (err < 0) {
dev_err(&client->dev,
"Failed to configure input direction for GPIO %d, error %d\n",
ts->irq_pin, err);
goto err_free_irq_gpio;
}
client->irq = gpio_to_irq(ts->irq_pin);
if (client->irq < 0) {
err = client->irq;
dev_err(&client->dev,
"Unable to get irq number for GPIO %d, error %d\n",
ts->irq_pin, err);
goto err_free_irq_gpio;
}
err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
IRQF_TRIGGER_RISING, "touch_reset_key", ts);
if (err < 0) {
dev_err(&client->dev,
"irq %d busy? error %d\n", client->irq, err);
goto err_free_irq_gpio;
}
err = input_register_device(input_dev);
if (err)
goto err_free_irq;
i2c_set_clientdata(client, ts);
device_init_wakeup(&client->dev, 1);
return 0;
err_free_irq:
free_irq(client->irq, ts);
err_free_irq_gpio:
gpio_free(ts->irq_pin);
err_shutoff_device:
cy8ctmg110_set_sleepmode(ts, true);
cy8ctmg110_power(ts, false);
if (ts->reset_pin)
gpio_free(ts->reset_pin);
err_free_mem:
input_free_device(input_dev);
kfree(ts);
return err;
}
#ifdef CONFIG_PM
static int cy8ctmg110_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev))
enable_irq_wake(client->irq);
else {
cy8ctmg110_set_sleepmode(ts, true);
cy8ctmg110_power(ts, false);
}
return 0;
}
static int cy8ctmg110_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev))
disable_irq_wake(client->irq);
else {
cy8ctmg110_power(ts, true);
cy8ctmg110_set_sleepmode(ts, false);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
#endif
static int __devexit cy8ctmg110_remove(struct i2c_client *client)
{
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
cy8ctmg110_set_sleepmode(ts, true);
cy8ctmg110_power(ts, false);
free_irq(client->irq, ts);
input_unregister_device(ts->input);
gpio_free(ts->irq_pin);
if (ts->reset_pin)
gpio_free(ts->reset_pin);
kfree(ts);
return 0;
}
static struct i2c_device_id cy8ctmg110_idtable[] = {
{ CY8CTMG110_DRIVER_NAME, 1 },
{ }
};
MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
static struct i2c_driver cy8ctmg110_driver = {
.driver = {
.owner = THIS_MODULE,
.name = CY8CTMG110_DRIVER_NAME,
#ifdef CONFIG_PM
.pm = &cy8ctmg110_pm,
#endif
},
.id_table = cy8ctmg110_idtable,
.probe = cy8ctmg110_probe,
.remove = __devexit_p(cy8ctmg110_remove),
};
static int __init cy8ctmg110_init(void)
{
return i2c_add_driver(&cy8ctmg110_driver);
}
static void __exit cy8ctmg110_exit(void)
{
i2c_del_driver(&cy8ctmg110_driver);
}
module_init(cy8ctmg110_init);
module_exit(cy8ctmg110_exit);
MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
MODULE_LICENSE("GPL v2");
