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/*
* Driver for Pixcir I2C touchscreen controllers.
*
* Copyright (C) 2010-2011 Pixcir, 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.
*
* 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
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/pixcir_ts.h>
struct pixcir_i2c_ts_data {
struct i2c_client *client;
struct input_dev *input;
const struct pixcir_ts_platform_data *chip;
bool exiting;
};
static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
{
struct pixcir_i2c_ts_data *tsdata = data;
u8 rdbuf[10], wrbuf[1] = { 0 };
u8 touch;
int ret;
ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
if (ret != sizeof(wrbuf)) {
dev_err(&tsdata->client->dev,
"%s: i2c_master_send failed(), ret=%d\n",
__func__, ret);
return;
}
ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
if (ret != sizeof(rdbuf)) {
dev_err(&tsdata->client->dev,
"%s: i2c_master_recv failed(), ret=%d\n",
__func__, ret);
return;
}
touch = rdbuf[0];
if (touch) {
u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];
input_report_key(tsdata->input, BTN_TOUCH, 1);
input_report_abs(tsdata->input, ABS_X, posx1);
input_report_abs(tsdata->input, ABS_Y, posy1);
input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
input_mt_sync(tsdata->input);
if (touch == 2) {
input_report_abs(tsdata->input,
ABS_MT_POSITION_X, posx2);
input_report_abs(tsdata->input,
ABS_MT_POSITION_Y, posy2);
input_mt_sync(tsdata->input);
}
} else {
input_report_key(tsdata->input, BTN_TOUCH, 0);
}
input_sync(tsdata->input);
}
static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
struct pixcir_i2c_ts_data *tsdata = dev_id;
while (!tsdata->exiting) {
pixcir_ts_poscheck(tsdata);
if (tsdata->chip->attb_read_val())
break;
msleep(20);
}
return IRQ_HANDLED;
}
#ifdef CONFIG_PM_SLEEP
static int pixcir_i2c_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (device_may_wakeup(&client->dev))
enable_irq_wake(client->irq);
return 0;
}
static int pixcir_i2c_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
if (device_may_wakeup(&client->dev))
disable_irq_wake(client->irq);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
static int pixcir_i2c_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct pixcir_ts_platform_data *pdata =
dev_get_platdata(&client->dev);
struct pixcir_i2c_ts_data *tsdata;
struct input_dev *input;
int error;
if (!pdata) {
dev_err(&client->dev, "platform data not defined\n");
return -EINVAL;
}
tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
input = input_allocate_device();
if (!tsdata || !input) {
dev_err(&client->dev, "Failed to allocate driver data!\n");
error = -ENOMEM;
goto err_free_mem;
}
tsdata->client = client;
tsdata->input = input;
tsdata->chip = pdata;
input->name = client->name;
input->id.bustype = BUS_I2C;
input->dev.parent = &client->dev;
__set_bit(EV_KEY, input->evbit);
__set_bit(EV_ABS, input->evbit);
__set_bit(BTN_TOUCH, input->keybit);
input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
input_set_drvdata(input, tsdata);
error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
client->name, tsdata);
if (error) {
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
goto err_free_mem;
}
error = input_register_device(input);
if (error)
goto err_free_irq;
i2c_set_clientdata(client, tsdata);
device_init_wakeup(&client->dev, 1);
return 0;
err_free_irq:
free_irq(client->irq, tsdata);
err_free_mem:
input_free_device(input);
kfree(tsdata);
return error;
}
static int pixcir_i2c_ts_remove(struct i2c_client *client)
{
struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);
device_init_wakeup(&client->dev, 0);
tsdata->exiting = true;
mb();
free_irq(client->irq, tsdata);
input_unregister_device(tsdata->input);
kfree(tsdata);
return 0;
}
static const struct i2c_device_id pixcir_i2c_ts_id[] = {
{ "pixcir_ts", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
static struct i2c_driver pixcir_i2c_ts_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "pixcir_ts",
.pm = &pixcir_dev_pm_ops,
},
.probe = pixcir_i2c_ts_probe,
.remove = pixcir_i2c_ts_remove,
.id_table = pixcir_i2c_ts_id,
};
module_i2c_driver(pixcir_i2c_ts_driver);
MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
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