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//[*]--------------------------------------------------------------------------------------------------[*]
//
//
//
// I2C Touchscreen driver
// 2012.01.17
//
//
//[*]--------------------------------------------------------------------------------------------------[*]
#include <linux/input.h> /* BUS_I2C */
#include <linux/i2c.h>
#include <linux/module.h>
//[*]--------------------------------------------------------------------------------------------------[*]
#include <linux/input/touch-pdata.h>
#include "touch.h"
//[*]--------------------------------------------------------------------------------------------------[*]
//
// function prototype
//
//[*]--------------------------------------------------------------------------------------------------[*]
static void __exit touch_i2c_exit (void);
static int __init touch_i2c_init (void);
static int __devexit touch_i2c_remove (struct i2c_client *client);
static int __devinit touch_i2c_probe (struct i2c_client *client, const struct i2c_device_id *id);
int touch_i2c_read (struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len);
int touch_i2c_write (struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len);
//[*]--------------------------------------------------------------------------------------------------[*]
#ifdef CONFIG_PM
static int touch_i2c_suspend(struct i2c_client *client, pm_message_t message)
{
#ifndef CONFIG_HAS_EARLYSUSPEND
struct touch *ts = i2c_get_clientdata(client);
ts->pdata->suspend(&client->dev);
#endif
return 0;
}
//[*]--------------------------------------------------------------------------------------------------[*]
static int touch_i2c_resume(struct i2c_client *client)
{
#ifndef CONFIG_HAS_EARLYSUSPEND
struct touch *ts = i2c_get_clientdata(client);
ts->pdata->resume(&cliet->dev);
#endif
return 0;
}
//[*]--------------------------------------------------------------------------------------------------[*]
#else
#define touch_i2c_suspend NULL
#define touch_i2c_resume NULL
#endif
//[*]--------------------------------------------------------------------------------------------------[*]
int touch_i2c_read(struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len)
{
struct i2c_msg msg[2];
int ret;
if((len == 0) || (data == NULL)) {
dev_err(&client->dev, "I2C read error: Null pointer or length == 0\n");
return -1;
}
memset(msg, 0x00, sizeof(msg));
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = cmd_len;
msg[0].buf = cmd;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].len = len;
msg[1].buf = data;
if ((ret = i2c_transfer(client->adapter, msg, 2)) != 2) {
dev_err(&client->dev, "I2C read error: (%d) reg: 0x%X len: %d\n", ret, cmd[0], len);
return -EIO;
}
return len;
}
//[*]--------------------------------------------------------------------------------------------------[*]
int touch_i2c_write(struct i2c_client *client, unsigned char *cmd, unsigned int cmd_len, unsigned char *data, unsigned int len)
{
int ret;
unsigned char block_data[10];
if((cmd_len + len) >= sizeof(block_data)) {
dev_err(&client->dev, "I2C write error: wdata overflow reg: 0x%X len: %d\n", cmd[0], cmd_len + len);
return -1;
}
memset(block_data, 0x00, sizeof(block_data));
if(cmd_len) memcpy(&block_data[0] , &cmd[0] , cmd_len);
if(len) memcpy(&block_data[cmd_len] , &data[0] , len);
if ((ret = i2c_master_send(client, block_data, (cmd_len + len)))< 0) {
dev_err(&client->dev, "I2C write error: (%d) reg: 0x%X len: %d\n", ret, cmd[0], len);
return ret;
}
return len;
}
//[*]--------------------------------------------------------------------------------------------------[*]
static int __devinit touch_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
return touch_probe(client);
}
//[*]--------------------------------------------------------------------------------------------------[*]
static int __devexit touch_i2c_remove(struct i2c_client *client)
{
return touch_remove(&client->dev);
}
//[*]--------------------------------------------------------------------------------------------------[*]
static const struct i2c_device_id touch_id[] = {
{ I2C_TOUCH_NAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, touch_id);
//[*]--------------------------------------------------------------------------------------------------[*]
static struct i2c_driver touch_i2c_driver = {
.driver = {
.name = I2C_TOUCH_NAME,
.owner = THIS_MODULE,
},
.probe = touch_i2c_probe,
.remove = __devexit_p(touch_i2c_remove),
.suspend = touch_i2c_suspend,
.resume = touch_i2c_resume,
.id_table = touch_id,
};
//[*]--------------------------------------------------------------------------------------------------[*]
static int __init touch_i2c_init(void)
{
return i2c_add_driver(&touch_i2c_driver);
}
module_init(touch_i2c_init);
//[*]--------------------------------------------------------------------------------------------------[*]
static void __exit touch_i2c_exit(void)
{
i2c_del_driver(&touch_i2c_driver);
}
module_exit(touch_i2c_exit);
//[*]--------------------------------------------------------------------------------------------------[*]
MODULE_AUTHOR("HardKernel Co., Ltd.");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Touchscreen I2C bus driver");
MODULE_ALIAS("i2c:touch");
//[*]--------------------------------------------------------------------------------------------------[*]
//[*]--------------------------------------------------------------------------------------------------[*]
|
