[deliverable/linux.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)

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

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

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 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,
		.pm	= &ad714x_spi_pm,
	},
	.probe		= ad714x_spi_probe,
	.remove		= ad714x_spi_remove,
};

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
	19	#ifdef CONFIG_PM
a257090c	20	static int ad714x_spi_suspend(struct device *dev)
31a62963	21	{
a257090c	22	return ad714x_disable(spi_get_drvdata(to_spi_device(dev)));
31a62963 BW	23	}
31a62963 BW	24
a257090c	25	static int ad714x_spi_resume(struct device *dev)
31a62963	26	{
a257090c	27	return ad714x_enable(spi_get_drvdata(to_spi_device(dev)));
31a62963	28	}
31a62963 BW	29	#endif
31a62963 BW	30
a257090c MB	31	static SIMPLE_DEV_PM_OPS(ad714x_spi_pm, ad714x_spi_suspend, ad714x_spi_resume);
a257090c MB	32
c0409feb	33	static int ad714x_spi_read(struct ad714x_chip *chip,
9eff794b	34	unsigned short reg, unsigned short *data, size_t len)
31a62963	35	{
c0409feb DT	36	struct spi_device *spi = to_spi_device(chip->dev);
	37	struct spi_message message;
	38	struct spi_transfer xfer[2];
9eff794b	39	int i;
c0409feb DT	40	int error;
	41
	42	spi_message_init(&message);
	43	memset(xfer, 0, sizeof(xfer));
	44
	45	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX \|
6337de22	46	AD714x_SPI_READ \| reg);
c0409feb DT	47	xfer[0].tx_buf = &chip->xfer_buf[0];
	48	xfer[0].len = sizeof(chip->xfer_buf[0]);
	49	spi_message_add_tail(&xfer[0], &message);
31a62963	50
c0409feb	51	xfer[1].rx_buf = &chip->xfer_buf[1];
9eff794b	52	xfer[1].len = sizeof(chip->xfer_buf[1]) * len;
c0409feb	53	spi_message_add_tail(&xfer[1], &message);
6337de22	54
c0409feb DT	55	error = spi_sync(spi, &message);
	56	if (unlikely(error)) {
	57	dev_err(chip->dev, "SPI read error: %d\n", error);
	58	return error;
	59	}
6337de22	60
9eff794b MH	61	for (i = 0; i < len; i++)
	62	data[i] = be16_to_cpu(chip->xfer_buf[i + 1]);
	63
c0409feb	64	return 0;
31a62963 BW	65	}
31a62963 BW	66
c0409feb	67	static int ad714x_spi_write(struct ad714x_chip *chip,
6337de22	68	unsigned short reg, unsigned short data)
31a62963	69	{
c0409feb DT	70	struct spi_device *spi = to_spi_device(chip->dev);
	71	int error;
	72
	73	chip->xfer_buf[0] = cpu_to_be16(AD714x_SPI_CMD_PREFIX \| reg);
	74	chip->xfer_buf[1] = cpu_to_be16(data);
	75
	76	error = spi_write(spi, (u8 *)chip->xfer_buf,
	77	2 * sizeof(*chip->xfer_buf));
	78	if (unlikely(error)) {
	79	dev_err(chip->dev, "SPI write error: %d\n", error);
	80	return error;
	81	}
31a62963	82
c0409feb	83	return 0;
31a62963 BW	84	}
31a62963 BW	85
5298cc4c	86	static int ad714x_spi_probe(struct spi_device *spi)
31a62963 BW	87	{
31a62963 BW	88	struct ad714x_chip *chip;
5b9063b1 MH	89	int err;
	90
	91	spi->bits_per_word = 8;
	92	err = spi_setup(spi);
	93	if (err < 0)
	94	return err;
31a62963 BW	95
	96	chip = ad714x_probe(&spi->dev, BUS_SPI, spi->irq,
	97	ad714x_spi_read, ad714x_spi_write);
	98	if (IS_ERR(chip))
	99	return PTR_ERR(chip);
	100
	101	spi_set_drvdata(spi, chip);
	102
	103	return 0;
	104	}
	105
	106	static int __devexit ad714x_spi_remove(struct spi_device *spi)
	107	{
	108	struct ad714x_chip *chip = spi_get_drvdata(spi);
	109
	110	ad714x_remove(chip);
	111	spi_set_drvdata(spi, NULL);
	112
	113	return 0;
	114	}
	115
	116	static struct spi_driver ad714x_spi_driver = {
	117	.driver = {
	118	.name = "ad714x_captouch",
	119	.owner = THIS_MODULE,
a257090c	120	.pm = &ad714x_spi_pm,
31a62963 BW	121	},
31a62963 BW	122	.probe = ad714x_spi_probe,
1cb0aa88	123	.remove = ad714x_spi_remove,
31a62963 BW	124	};
31a62963 BW	125
ca83922e	126	module_spi_driver(ad714x_spi_driver);
31a62963 BW	127
	128	MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor SPI Bus Driver");
	129	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	130	MODULE_LICENSE("GPL");