[linux-2.6-block.git] / drivers / input / misc / ad714x-spi.c

/*
 * AD714X CapTouch Programmable Controller driver (SPI bus)
 *
 * Copyright 2009-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>	/* BUS_SPI */
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/pm.h>
#include <linux/types.h>
#include "ad714x.h"

#define AD714x_SPI_CMD_PREFIX      0xE000   /* bits 15:11 */
#define AD714x_SPI_READ            BIT(10)

static int __maybe_unused ad714x_spi_suspend(struct device *dev)
{
	return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
}

static int __maybe_unused ad714x_spi_resume(struct device *dev)
{
	return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
}

static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);

static int ad714x_spi_read(struct ad714x_chip *chip,
			   unsigned short reg, unsigned short *data, size_t len)
{
	struct spi_device *spi = to_spi_device(chip->dev);
	struct spi_message message;
	struct spi_transfer xfer[2];
	int i;
	int error;

	spi_message_init(&message);
	memset(xfer, 0, sizeof(xfer));

	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX |
					AD714x_SPI_READ | reg);
	xfer[0].tx_buf = &chip->xfer_buf[0];
	xfer[0].len = sizeof(chip->xfer_buf[0]);
	spi_message_add_tail(&xfer[0], &message);

	xfer[1].rx_buf = &chip->xfer_buf[1];
	xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
	spi_message_add_tail(&xfer[1], &message);

	error = spi_sync(spi, &message);
	if (unlikely(error)) {
		dev_err(chip->dev, "SPI read error: %d\n", error);
		return error;
	}

	for (i = 0; i < len; i++)
		data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);

	return 0;
}

static int ad714x_spi_write(struct ad714x_chip *chip,
			    unsigned short reg, unsigned short data)
{
	struct spi_device *spi = to_spi_device(chip->dev);
	int error;

	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX | reg);
	chip->xfer_buf[1] = cpu_to_be16(data);

	error = spi_write(spi, (u8 *)chip->xfer_buf,
			  2 * sizeof(*chip->xfer_buf));
	if (unlikely(error)) {
		dev_err(chip->dev, "SPI write error: %d\n", error);
		return error;
	}

	return 0;
}

static int ad714x_spi_probe(struct spi_device *spi)
{
	struct ad714x_chip *chip;
	int err;

	spi->bits_per_word = 8;
	err = spi_setup(spi);
	if (err < 0)
		return err;

	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 struct spi_driver ad714x_spi_driver = {
	.driver = {
		.name	= "ad714x_captouch",
		.pm	= &ad714x_spi_pm,
	},
	.probe		= ad714x_spi_probe,
};

module_spi_driver(ad714x_spi_driver);

MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
31a62963 BW	1	/*
	2	* AD714X CapTouch Programmable Controller driver (SPI bus)
	3	*
9eff794b	4	* Copyright 2009-2011 Analog Devices Inc.
31a62963 BW	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
6337de22	9	#include <linux/input.h> /* BUS_SPI */
31a62963 BW	10	#include <linux/module.h>
31a62963 BW	11	#include <linux/spi/spi.h>
a257090c	12	#include <linux/pm.h>
31a62963 BW	13	#include <linux/types.h>
	14	#include "ad714x.h"
	15
	16	#define AD714x_SPI_CMD_PREFIX 0xE000 /* bits 15:11 */
	17	#define AD714x_SPI_READ BIT(10)
	18
97a652a8	19	static int __maybe_unused ad714x_spi_suspend(struct device *dev)
31a62963	20	{
a257090c	21	return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
31a62963 BW	22	}
31a62963 BW	23
97a652a8	24	static int __maybe_unused ad714x_spi_resume(struct device *dev)
31a62963	25	{
a257090c	26	return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
31a62963	27	}
31a62963	28
a257090c MB	29	static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
a257090c MB	30
c0409feb	31	static int ad714x_spi_read(struct ad714x_chip *chip,
9eff794b	32	unsigned short reg, unsigned short *data, size_t len)
31a62963	33	{
c0409feb DT	34	struct spi_device *spi = to_spi_device(chip->dev);
	35	struct spi_message message;
	36	struct spi_transfer xfer[2];
9eff794b	37	int i;
c0409feb DT	38	int error;
	39
	40	spi_message_init(&message);
	41	memset(xfer, 0, sizeof(xfer));
	42
	43	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX \|
6337de22	44	AD714x_SPI_READ \| reg);
c0409feb DT	45	xfer[0].tx_buf = &chip->xfer_buf[0];
	46	xfer[0].len = sizeof(chip->xfer_buf[0]);
	47	spi_message_add_tail(&xfer[0], &message);
31a62963	48
c0409feb	49	xfer[1].rx_buf = &chip->xfer_buf[1];
9eff794b	50	xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
c0409feb	51	spi_message_add_tail(&xfer[1], &message);
6337de22	52
c0409feb DT	53	error = spi_sync(spi, &message);
	54	if (unlikely(error)) {
	55	dev_err(chip->dev, "SPI read error: %d\n", error);
	56	return error;
	57	}
6337de22	58
9eff794b MH	59	for (i = 0; i < len; i++)
	60	data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
	61
c0409feb	62	return 0;
31a62963 BW	63	}
31a62963 BW	64
c0409feb	65	static int ad714x_spi_write(struct ad714x_chip *chip,
6337de22	66	unsigned short reg, unsigned short data)
31a62963	67	{
c0409feb DT	68	struct spi_device *spi = to_spi_device(chip->dev);
	69	int error;
	70
	71	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX \| reg);
	72	chip->xfer_buf[1] = cpu_to_be16(data);
	73
	74	error = spi_write(spi, (u8 *)chip->xfer_buf,
	75	2 * sizeof(*chip->xfer_buf));
	76	if (unlikely(error)) {
	77	dev_err(chip->dev, "SPI write error: %d\n", error);
	78	return error;
	79	}
31a62963	80
c0409feb	81	return 0;
31a62963 BW	82	}
31a62963 BW	83
5298cc4c	84	static int ad714x_spi_probe(struct spi_device *spi)
31a62963 BW	85	{
31a62963 BW	86	struct ad714x_chip *chip;
5b9063b1 MH	87	int err;
	88
	89	spi->bits_per_word = 8;
	90	err = spi_setup(spi);
	91	if (err < 0)
	92	return err;
31a62963 BW	93
	94	chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
	95	ad714x_spi_read, ad714x_spi_write);
	96	if (IS_ERR(chip))
	97	return PTR_ERR(chip);
	98
	99	spi_set_drvdata(spi, chip);
	100
	101	return 0;
	102	}
	103
31a62963 BW	104	static struct spi_driver ad714x_spi_driver = {
	105	.driver = {
	106	.name = "ad714x_captouch",
a257090c	107	.pm = &ad714x_spi_pm,
31a62963 BW	108	},
31a62963 BW	109	.probe = ad714x_spi_probe,
31a62963 BW	110	};
31a62963 BW	111
ca83922e	112	module_spi_driver(ad714x_spi_driver);
31a62963 BW	113
	114	MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
	115	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	116	MODULE_LICENSE("GPL");