mirror of https://gitee.com/openkylin/linux.git
250 lines
6.1 KiB
C
250 lines
6.1 KiB
C
/*
|
|
* Touch Screen driver for Renesas MIGO-R Platform
|
|
*
|
|
* Copyright (c) 2008 Magnus Damm
|
|
* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
|
|
* Kenati Technologies Pvt Ltd.
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/input.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/io.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/timer.h>
|
|
|
|
#define EVENT_PENDOWN 1
|
|
#define EVENT_REPEAT 2
|
|
#define EVENT_PENUP 3
|
|
|
|
struct migor_ts_priv {
|
|
struct i2c_client *client;
|
|
struct input_dev *input;
|
|
int irq;
|
|
};
|
|
|
|
static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
|
|
0x01, 0x06, 0x07, };
|
|
static const u_int8_t migor_ts_dis_seq[17] = { };
|
|
|
|
static irqreturn_t migor_ts_isr(int irq, void *dev_id)
|
|
{
|
|
struct migor_ts_priv *priv = dev_id;
|
|
unsigned short xpos, ypos;
|
|
unsigned char event;
|
|
u_int8_t buf[16];
|
|
|
|
/*
|
|
* The touch screen controller chip is hooked up to the CPU
|
|
* using I2C and a single interrupt line. The interrupt line
|
|
* is pulled low whenever someone taps the screen. To deassert
|
|
* the interrupt line we need to acknowledge the interrupt by
|
|
* communicating with the controller over the slow i2c bus.
|
|
*
|
|
* Since I2C bus controller may sleep we are using threaded
|
|
* IRQ here.
|
|
*/
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
|
|
/* Set Index 0 */
|
|
buf[0] = 0;
|
|
if (i2c_master_send(priv->client, buf, 1) != 1) {
|
|
dev_err(&priv->client->dev, "Unable to write i2c index\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Now do Page Read */
|
|
if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
|
|
dev_err(&priv->client->dev, "Unable to read i2c page\n");
|
|
goto out;
|
|
}
|
|
|
|
ypos = ((buf[9] & 0x03) << 8 | buf[8]);
|
|
xpos = ((buf[11] & 0x03) << 8 | buf[10]);
|
|
event = buf[12];
|
|
|
|
switch (event) {
|
|
case EVENT_PENDOWN:
|
|
case EVENT_REPEAT:
|
|
input_report_key(priv->input, BTN_TOUCH, 1);
|
|
input_report_abs(priv->input, ABS_X, ypos); /*X-Y swap*/
|
|
input_report_abs(priv->input, ABS_Y, xpos);
|
|
input_sync(priv->input);
|
|
break;
|
|
|
|
case EVENT_PENUP:
|
|
input_report_key(priv->input, BTN_TOUCH, 0);
|
|
input_sync(priv->input);
|
|
break;
|
|
}
|
|
|
|
out:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int migor_ts_open(struct input_dev *dev)
|
|
{
|
|
struct migor_ts_priv *priv = input_get_drvdata(dev);
|
|
struct i2c_client *client = priv->client;
|
|
int count;
|
|
|
|
/* enable controller */
|
|
count = i2c_master_send(client, migor_ts_ena_seq,
|
|
sizeof(migor_ts_ena_seq));
|
|
if (count != sizeof(migor_ts_ena_seq)) {
|
|
dev_err(&client->dev, "Unable to enable touchscreen.\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void migor_ts_close(struct input_dev *dev)
|
|
{
|
|
struct migor_ts_priv *priv = input_get_drvdata(dev);
|
|
struct i2c_client *client = priv->client;
|
|
|
|
disable_irq(priv->irq);
|
|
|
|
/* disable controller */
|
|
i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
|
|
|
|
enable_irq(priv->irq);
|
|
}
|
|
|
|
static int migor_ts_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *idp)
|
|
{
|
|
struct migor_ts_priv *priv;
|
|
struct input_dev *input;
|
|
int error;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
input = input_allocate_device();
|
|
if (!priv || !input) {
|
|
dev_err(&client->dev, "failed to allocate memory\n");
|
|
error = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
priv->client = client;
|
|
priv->input = input;
|
|
priv->irq = client->irq;
|
|
|
|
input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
|
|
|
|
__set_bit(BTN_TOUCH, input->keybit);
|
|
|
|
input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
|
|
input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);
|
|
|
|
input->name = client->name;
|
|
input->id.bustype = BUS_I2C;
|
|
input->dev.parent = &client->dev;
|
|
|
|
input->open = migor_ts_open;
|
|
input->close = migor_ts_close;
|
|
|
|
input_set_drvdata(input, priv);
|
|
|
|
error = request_threaded_irq(priv->irq, NULL, migor_ts_isr,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
client->name, priv);
|
|
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, priv);
|
|
device_init_wakeup(&client->dev, 1);
|
|
|
|
return 0;
|
|
|
|
err_free_irq:
|
|
free_irq(priv->irq, priv);
|
|
err_free_mem:
|
|
input_free_device(input);
|
|
kfree(priv);
|
|
return error;
|
|
}
|
|
|
|
static int migor_ts_remove(struct i2c_client *client)
|
|
{
|
|
struct migor_ts_priv *priv = i2c_get_clientdata(client);
|
|
|
|
free_irq(priv->irq, priv);
|
|
input_unregister_device(priv->input);
|
|
kfree(priv);
|
|
|
|
dev_set_drvdata(&client->dev, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused migor_ts_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct migor_ts_priv *priv = i2c_get_clientdata(client);
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
enable_irq_wake(priv->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused migor_ts_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct migor_ts_priv *priv = i2c_get_clientdata(client);
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
disable_irq_wake(priv->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(migor_ts_pm, migor_ts_suspend, migor_ts_resume);
|
|
|
|
static const struct i2c_device_id migor_ts_id[] = {
|
|
{ "migor_ts", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, migor_ts_id);
|
|
|
|
static struct i2c_driver migor_ts_driver = {
|
|
.driver = {
|
|
.name = "migor_ts",
|
|
.pm = &migor_ts_pm,
|
|
},
|
|
.probe = migor_ts_probe,
|
|
.remove = migor_ts_remove,
|
|
.id_table = migor_ts_id,
|
|
};
|
|
|
|
module_i2c_driver(migor_ts_driver);
|
|
|
|
MODULE_DESCRIPTION("MigoR Touchscreen driver");
|
|
MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
|
|
MODULE_LICENSE("GPL");
|