104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
|
/*
|
||
|
|
* AD714X CapTouch Programmable Controller driver (SPI bus)
|
||
|
|
*
|
||
|
|
* Copyright 2009 Analog Devices Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the GPL-2 or later.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/input.h> /* BUS_I2C */
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/spi/spi.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include "ad714x.h"
|
||
|
|
|
||
|
|
#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
|
||
|
|
#define AD714x_SPI_READ BIT(10)
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
static int ad714x_spi_suspend(struct spi_device *spi, pm_message_t message)
|
||
|
|
{
|
||
|
|
return ad714x_disable(spi_get_drvdata(spi));
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ad714x_spi_resume(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
return ad714x_enable(spi_get_drvdata(spi));
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
# define ad714x_spi_suspend NULL
|
||
|
|
# define ad714x_spi_resume NULL
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static int ad714x_spi_read(struct device *dev, unsigned short reg,
|
||
|
|
unsigned short *data)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
unsigned short tx = AD714x_SPI_CMD_PREFIX | AD714x_SPI_READ | reg;
|
||
|
|
|
||
|
|
return spi_write_then_read(spi, (u8 *)&tx, 2, (u8 *)data, 2);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int ad714x_spi_write(struct device *dev, unsigned short reg,
|
||
|
|
unsigned short data)
|
||
|
|
{
|
||
|
|
struct spi_device *spi = to_spi_device(dev);
|
||
|
|
unsigned short tx[2] = {
|
||
|
|
AD714x_SPI_CMD_PREFIX | reg,
|
||
|
|
data
|
||
|
|
};
|
||
|
|
|
||
|
|
return spi_write(spi, (u8 *)tx, 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __devinit ad714x_spi_probe(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct ad714x_chip *chip;
|
||
|
|
|
||
|
|
chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
|
||
|
|
ad714x_spi_read, ad714x_spi_write);
|
||
|
|
if (IS_ERR(chip))
|
||
|
|
return PTR_ERR(chip);
|
||
|
|
|
||
|
|
spi_set_drvdata(spi, chip);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __devexit ad714x_spi_remove(struct spi_device *spi)
|
||
|
|
{
|
||
|
|
struct ad714x_chip *chip = spi_get_drvdata(spi);
|
||
|
|
|
||
|
|
ad714x_remove(chip);
|
||
|
|
spi_set_drvdata(spi, NULL);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct spi_driver ad714x_spi_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "ad714x_captouch",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
},
|
||
|
|
.probe = ad714x_spi_probe,
|
||
|
|
.remove = __devexit_p(ad714x_spi_remove),
|
||
|
|
.suspend = ad714x_spi_suspend,
|
||
|
|
.resume = ad714x_spi_resume,
|
||
|
|
};
|
||
|
|
|
||
|
|
static __init int ad714x_spi_init(void)
|
||
|
|
{
|
||
|
|
return spi_register_driver(&ad714x_spi_driver);
|
||
|
|
}
|
||
|
|
module_init(ad714x_spi_init);
|
||
|
|
|
||
|
|
static __exit void ad714x_spi_exit(void)
|
||
|
|
{
|
||
|
|
spi_unregister_driver(&ad714x_spi_driver);
|
||
|
|
}
|
||
|
|
module_exit(ad714x_spi_exit);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
|
||
|
|
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
|
||
|
|
MODULE_LICENSE("GPL");
|