[deliverable/linux.git] / drivers / input / misc / ad714x-i2c.c

/*
 * AD714X CapTouch Programmable Controller driver (I2C bus)
 *
 * Copyright 2009-2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>	/* BUS_I2C */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/pm.h>
#include "ad714x.h"

static int __maybe_unused ad714x_i2c_suspend(struct device *dev)
{
	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
}

static int __maybe_unused ad714x_i2c_resume(struct device *dev)
{
	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
}

static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);

static int ad714x_i2c_write(struct ad714x_chip *chip,
			    unsigned short reg, unsigned short data)
{
	struct i2c_client *client = to_i2c_client(chip->dev);
	int error;

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

	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
				2 * sizeof(*chip->xfer_buf));
	if (unlikely(error < 0)) {
		dev_err(&client->dev, "I2C write error: %d\n", error);
		return error;
	}

	return 0;
}

static int ad714x_i2c_read(struct ad714x_chip *chip,
			   unsigned short reg, unsigned short *data, size_t len)
{
	struct i2c_client *client = to_i2c_client(chip->dev);
	int i;
	int error;

	chip->xfer_buf[0] = cpu_to_be16(reg);

	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
				sizeof(*chip->xfer_buf));
	if (error >= 0)
		error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
					len * sizeof(*chip->xfer_buf));

	if (unlikely(error < 0)) {
		dev_err(&client->dev, "I2C read error: %d\n", error);
		return error;
	}

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

	return 0;
}

static int ad714x_i2c_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	struct ad714x_chip *chip;

	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
			    ad714x_i2c_read, ad714x_i2c_write);
	if (IS_ERR(chip))
		return PTR_ERR(chip);

	i2c_set_clientdata(client, chip);

	return 0;
}

static const struct i2c_device_id ad714x_id[] = {
	{ "ad7142_captouch", 0 },
	{ "ad7143_captouch", 0 },
	{ "ad7147_captouch", 0 },
	{ "ad7147a_captouch", 0 },
	{ "ad7148_captouch", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad714x_id);

static struct i2c_driver ad714x_i2c_driver = {
	.driver = {
		.name = "ad714x_captouch",
		.pm   = &ad714x_i2c_pm,
	},
	.probe    = ad714x_i2c_probe,
	.id_table = ad714x_id,
};

module_i2c_driver(ad714x_i2c_driver);

MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
31a62963 BW	1	/*
	2	* AD714X CapTouch Programmable Controller driver (I2C bus)
	3	*
9eff794b	4	* Copyright 2009-2011 Analog Devices Inc.
31a62963 BW	5	*
	6	* Licensed under the GPL-2 or later.
	7	*/
	8
	9	#include <linux/input.h> /* BUS_I2C */
	10	#include <linux/i2c.h>
	11	#include <linux/module.h>
	12	#include <linux/types.h>
6b7cfd19	13	#include <linux/pm.h>
31a62963 BW	14	#include "ad714x.h"
31a62963 BW	15
97a652a8	16	static int __maybe_unused ad714x_i2c_suspend(struct device *dev)
31a62963	17	{
6b7cfd19	18	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
31a62963 BW	19	}
31a62963 BW	20
97a652a8	21	static int __maybe_unused ad714x_i2c_resume(struct device *dev)
31a62963	22	{
6b7cfd19	23	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
31a62963	24	}
31a62963	25
6b7cfd19 MB	26	static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
6b7cfd19 MB	27
c0409feb DT	28	static int ad714x_i2c_write(struct ad714x_chip *chip,
c0409feb DT	29	unsigned short reg, unsigned short data)
31a62963	30	{
c0409feb DT	31	struct i2c_client *client = to_i2c_client(chip->dev);
	32	int error;
	33
	34	chip->xfer_buf[0] = cpu_to_be16(reg);
	35	chip->xfer_buf[1] = cpu_to_be16(data);
	36
	37	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
	38	2 * sizeof(*chip->xfer_buf));
	39	if (unlikely(error < 0)) {
	40	dev_err(&client->dev, "I2C write error: %d\n", error);
	41	return error;
	42	}
	43
	44	return 0;
31a62963 BW	45	}
31a62963 BW	46
c0409feb	47	static int ad714x_i2c_read(struct ad714x_chip *chip,
9eff794b	48	unsigned short reg, unsigned short *data, size_t len)
31a62963	49	{
c0409feb	50	struct i2c_client *client = to_i2c_client(chip->dev);
9eff794b	51	int i;
c0409feb DT	52	int error;
	53
	54	chip->xfer_buf[0] = cpu_to_be16(reg);
31a62963	55
c0409feb DT	56	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
	57	sizeof(*chip->xfer_buf));
	58	if (error >= 0)
	59	error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
9eff794b	60	len * sizeof(*chip->xfer_buf));
31a62963	61
c0409feb DT	62	if (unlikely(error < 0)) {
	63	dev_err(&client->dev, "I2C read error: %d\n", error);
	64	return error;
31a62963 BW	65	}
31a62963 BW	66
9eff794b MH	67	for (i = 0; i < len; i++)
	68	data[i] = be16_to_cpu(chip->xfer_buf[i]);
	69
c0409feb	70	return 0;
31a62963 BW	71	}
31a62963 BW	72
5298cc4c	73	static int ad714x_i2c_probe(struct i2c_client *client,
31a62963 BW	74	const struct i2c_device_id *id)
	75	{
	76	struct ad714x_chip *chip;
	77
	78	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
	79	ad714x_i2c_read, ad714x_i2c_write);
	80	if (IS_ERR(chip))
	81	return PTR_ERR(chip);
	82
	83	i2c_set_clientdata(client, chip);
	84
	85	return 0;
	86	}
	87
31a62963 BW	88	static const struct i2c_device_id ad714x_id[] = {
31a62963 BW	89	{ "ad7142_captouch", 0 },
6c04d7b3	90	{ "ad7143_captouch", 0 },
31a62963	91	{ "ad7147_captouch", 0 },
6c04d7b3 BS	92	{ "ad7147a_captouch", 0 },
6c04d7b3 BS	93	{ "ad7148_captouch", 0 },
31a62963 BW	94	{ }
	95	};
	96	MODULE_DEVICE_TABLE(i2c, ad714x_id);
	97
	98	static struct i2c_driver ad714x_i2c_driver = {
	99	.driver = {
	100	.name = "ad714x_captouch",
6b7cfd19	101	.pm = &ad714x_i2c_pm,
31a62963 BW	102	},
31a62963 BW	103	.probe = ad714x_i2c_probe,
31a62963 BW	104	.id_table = ad714x_id,
	105	};
	106
1b92c1cf	107	module_i2c_driver(ad714x_i2c_driver);
31a62963 BW	108
	109	MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
	110	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	111	MODULE_LICENSE("GPL");