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