2 * AD714X CapTouch Programmable Controller driver (SPI bus)
4 * Copyright 2009 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/input.h> /* BUS_I2C */
10 #include <linux/module.h>
11 #include <linux/spi/spi.h>
12 #include <linux/types.h>
15 #define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
16 #define AD714x_SPI_READ BIT(10)
19 static int ad714x_spi_suspend(struct spi_device *spi, pm_message_t message)
21 return ad714x_disable(spi_get_drvdata(spi));
24 static int ad714x_spi_resume(struct spi_device *spi)
26 return ad714x_enable(spi_get_drvdata(spi));
29 # define ad714x_spi_suspend NULL
30 # define ad714x_spi_resume NULL
33 static int ad714x_spi_read(struct device *dev, unsigned short reg,
36 struct spi_device *spi = to_spi_device(dev);
37 unsigned short tx = AD714x_SPI_CMD_PREFIX | AD714x_SPI_READ | reg;
39 return spi_write_then_read(spi, (u8 *)&tx, 2, (u8 *)data, 2);
42 static int ad714x_spi_write(struct device *dev, unsigned short reg,
45 struct spi_device *spi = to_spi_device(dev);
46 unsigned short tx[2] = {
47 AD714x_SPI_CMD_PREFIX | reg,
51 return spi_write(spi, (u8 *)tx, 4);
54 static int __devinit ad714x_spi_probe(struct spi_device *spi)
56 struct ad714x_chip *chip;
58 chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
59 ad714x_spi_read, ad714x_spi_write);
63 spi_set_drvdata(spi, chip);
68 static int __devexit ad714x_spi_remove(struct spi_device *spi)
70 struct ad714x_chip *chip = spi_get_drvdata(spi);
73 spi_set_drvdata(spi, NULL);
78 static struct spi_driver ad714x_spi_driver = {
80 .name = "ad714x_captouch",
83 .probe = ad714x_spi_probe,
84 .remove = __devexit_p(ad714x_spi_remove),
85 .suspend = ad714x_spi_suspend,
86 .resume = ad714x_spi_resume,
89 static __init int ad714x_spi_init(void)
91 return spi_register_driver(&ad714x_spi_driver);
93 module_init(ad714x_spi_init);
95 static __exit void ad714x_spi_exit(void)
97 spi_unregister_driver(&ad714x_spi_driver);
99 module_exit(ad714x_spi_exit);
101 MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
102 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
103 MODULE_LICENSE("GPL");