mirror of https://gitee.com/openkylin/linux.git
330 lines
7.8 KiB
C
330 lines
7.8 KiB
C
/*
|
|
* Touch Screen driver for EETI's I2C connected touch screen panels
|
|
* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
|
|
*
|
|
* See EETI's software guide for the protocol specification:
|
|
* http://home.eeti.com.tw/web20/eg/guide.htm
|
|
*
|
|
* Based on migor_ts.c
|
|
* Copyright (c) 2008 Magnus Damm
|
|
* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>
|
|
*
|
|
* This file is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This file 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/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/input/eeti_ts.h>
|
|
#include <linux/slab.h>
|
|
|
|
static bool flip_x;
|
|
module_param(flip_x, bool, 0644);
|
|
MODULE_PARM_DESC(flip_x, "flip x coordinate");
|
|
|
|
static bool flip_y;
|
|
module_param(flip_y, bool, 0644);
|
|
MODULE_PARM_DESC(flip_y, "flip y coordinate");
|
|
|
|
struct eeti_ts_priv {
|
|
struct i2c_client *client;
|
|
struct input_dev *input;
|
|
struct work_struct work;
|
|
struct mutex mutex;
|
|
int irq_gpio, irq, irq_active_high;
|
|
};
|
|
|
|
#define EETI_TS_BITDEPTH (11)
|
|
#define EETI_MAXVAL ((1 << (EETI_TS_BITDEPTH + 1)) - 1)
|
|
|
|
#define REPORT_BIT_PRESSED (1 << 0)
|
|
#define REPORT_BIT_AD0 (1 << 1)
|
|
#define REPORT_BIT_AD1 (1 << 2)
|
|
#define REPORT_BIT_HAS_PRESSURE (1 << 6)
|
|
#define REPORT_RES_BITS(v) (((v) >> 1) + EETI_TS_BITDEPTH)
|
|
|
|
static inline int eeti_ts_irq_active(struct eeti_ts_priv *priv)
|
|
{
|
|
return gpio_get_value(priv->irq_gpio) == priv->irq_active_high;
|
|
}
|
|
|
|
static void eeti_ts_read(struct work_struct *work)
|
|
{
|
|
char buf[6];
|
|
unsigned int x, y, res, pressed, to = 100;
|
|
struct eeti_ts_priv *priv =
|
|
container_of(work, struct eeti_ts_priv, work);
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
while (eeti_ts_irq_active(priv) && --to)
|
|
i2c_master_recv(priv->client, buf, sizeof(buf));
|
|
|
|
if (!to) {
|
|
dev_err(&priv->client->dev,
|
|
"unable to clear IRQ - line stuck?\n");
|
|
goto out;
|
|
}
|
|
|
|
/* drop non-report packets */
|
|
if (!(buf[0] & 0x80))
|
|
goto out;
|
|
|
|
pressed = buf[0] & REPORT_BIT_PRESSED;
|
|
res = REPORT_RES_BITS(buf[0] & (REPORT_BIT_AD0 | REPORT_BIT_AD1));
|
|
x = buf[2] | (buf[1] << 8);
|
|
y = buf[4] | (buf[3] << 8);
|
|
|
|
/* fix the range to 11 bits */
|
|
x >>= res - EETI_TS_BITDEPTH;
|
|
y >>= res - EETI_TS_BITDEPTH;
|
|
|
|
if (flip_x)
|
|
x = EETI_MAXVAL - x;
|
|
|
|
if (flip_y)
|
|
y = EETI_MAXVAL - y;
|
|
|
|
if (buf[0] & REPORT_BIT_HAS_PRESSURE)
|
|
input_report_abs(priv->input, ABS_PRESSURE, buf[5]);
|
|
|
|
input_report_abs(priv->input, ABS_X, x);
|
|
input_report_abs(priv->input, ABS_Y, y);
|
|
input_report_key(priv->input, BTN_TOUCH, !!pressed);
|
|
input_sync(priv->input);
|
|
|
|
out:
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
|
|
static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
|
|
{
|
|
struct eeti_ts_priv *priv = dev_id;
|
|
|
|
/* postpone I2C transactions as we are atomic */
|
|
schedule_work(&priv->work);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void eeti_ts_start(struct eeti_ts_priv *priv)
|
|
{
|
|
enable_irq(priv->irq);
|
|
|
|
/* Read the events once to arm the IRQ */
|
|
eeti_ts_read(&priv->work);
|
|
}
|
|
|
|
static void eeti_ts_stop(struct eeti_ts_priv *priv)
|
|
{
|
|
disable_irq(priv->irq);
|
|
cancel_work_sync(&priv->work);
|
|
}
|
|
|
|
static int eeti_ts_open(struct input_dev *dev)
|
|
{
|
|
struct eeti_ts_priv *priv = input_get_drvdata(dev);
|
|
|
|
eeti_ts_start(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void eeti_ts_close(struct input_dev *dev)
|
|
{
|
|
struct eeti_ts_priv *priv = input_get_drvdata(dev);
|
|
|
|
eeti_ts_stop(priv);
|
|
}
|
|
|
|
static int eeti_ts_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *idp)
|
|
{
|
|
struct eeti_ts_platform_data *pdata = client->dev.platform_data;
|
|
struct eeti_ts_priv *priv;
|
|
struct input_dev *input;
|
|
unsigned int irq_flags;
|
|
int err = -ENOMEM;
|
|
|
|
/*
|
|
* In contrast to what's described in the datasheet, there seems
|
|
* to be no way of probing the presence of that device using I2C
|
|
* commands. So we need to blindly believe it is there, and wait
|
|
* for interrupts to occur.
|
|
*/
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv) {
|
|
dev_err(&client->dev, "failed to allocate driver data\n");
|
|
goto err0;
|
|
}
|
|
|
|
mutex_init(&priv->mutex);
|
|
input = input_allocate_device();
|
|
|
|
if (!input) {
|
|
dev_err(&client->dev, "Failed to allocate input device.\n");
|
|
goto err1;
|
|
}
|
|
|
|
input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
|
input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
|
|
|
|
input_set_abs_params(input, ABS_X, 0, EETI_MAXVAL, 0, 0);
|
|
input_set_abs_params(input, ABS_Y, 0, EETI_MAXVAL, 0, 0);
|
|
input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0);
|
|
|
|
input->name = client->name;
|
|
input->id.bustype = BUS_I2C;
|
|
input->dev.parent = &client->dev;
|
|
input->open = eeti_ts_open;
|
|
input->close = eeti_ts_close;
|
|
|
|
priv->client = client;
|
|
priv->input = input;
|
|
priv->irq_gpio = pdata->irq_gpio;
|
|
priv->irq = gpio_to_irq(pdata->irq_gpio);
|
|
|
|
err = gpio_request_one(pdata->irq_gpio, GPIOF_IN, client->name);
|
|
if (err < 0)
|
|
goto err1;
|
|
|
|
priv->irq_active_high = pdata->irq_active_high;
|
|
|
|
irq_flags = priv->irq_active_high ?
|
|
IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING;
|
|
|
|
INIT_WORK(&priv->work, eeti_ts_read);
|
|
i2c_set_clientdata(client, priv);
|
|
input_set_drvdata(input, priv);
|
|
|
|
err = input_register_device(input);
|
|
if (err)
|
|
goto err2;
|
|
|
|
err = request_irq(priv->irq, eeti_ts_isr, irq_flags,
|
|
client->name, priv);
|
|
if (err) {
|
|
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
|
|
goto err3;
|
|
}
|
|
|
|
/*
|
|
* Disable the device for now. It will be enabled once the
|
|
* input device is opened.
|
|
*/
|
|
eeti_ts_stop(priv);
|
|
|
|
device_init_wakeup(&client->dev, 0);
|
|
return 0;
|
|
|
|
err3:
|
|
input_unregister_device(input);
|
|
input = NULL; /* so we dont try to free it below */
|
|
err2:
|
|
gpio_free(pdata->irq_gpio);
|
|
err1:
|
|
input_free_device(input);
|
|
kfree(priv);
|
|
err0:
|
|
return err;
|
|
}
|
|
|
|
static int eeti_ts_remove(struct i2c_client *client)
|
|
{
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
|
|
|
free_irq(priv->irq, priv);
|
|
/*
|
|
* eeti_ts_stop() leaves IRQ disabled. We need to re-enable it
|
|
* so that device still works if we reload the driver.
|
|
*/
|
|
enable_irq(priv->irq);
|
|
|
|
input_unregister_device(priv->input);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int eeti_ts_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
|
struct input_dev *input_dev = priv->input;
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
if (input_dev->users)
|
|
eeti_ts_stop(priv);
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
enable_irq_wake(priv->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int eeti_ts_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct eeti_ts_priv *priv = i2c_get_clientdata(client);
|
|
struct input_dev *input_dev = priv->input;
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
disable_irq_wake(priv->irq);
|
|
|
|
mutex_lock(&input_dev->mutex);
|
|
|
|
if (input_dev->users)
|
|
eeti_ts_start(priv);
|
|
|
|
mutex_unlock(&input_dev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(eeti_ts_pm, eeti_ts_suspend, eeti_ts_resume);
|
|
|
|
static const struct i2c_device_id eeti_ts_id[] = {
|
|
{ "eeti_ts", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, eeti_ts_id);
|
|
|
|
static struct i2c_driver eeti_ts_driver = {
|
|
.driver = {
|
|
.name = "eeti_ts",
|
|
.pm = &eeti_ts_pm,
|
|
},
|
|
.probe = eeti_ts_probe,
|
|
.remove = eeti_ts_remove,
|
|
.id_table = eeti_ts_id,
|
|
};
|
|
|
|
module_i2c_driver(eeti_ts_driver);
|
|
|
|
MODULE_DESCRIPTION("EETI Touchscreen driver");
|
|
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
|
|
MODULE_LICENSE("GPL");
|