[linux-2.6-block.git] / drivers / input / touchscreen / ad7879-i2c.c

/*
 * AD7879-1/AD7889-1 touchscreen (I2C bus)
 *
 * Copyright (C) 2008-2010 Michael Hennerich, 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/of.h>
#include <linux/pm.h>

#include "ad7879.h"

#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */

/* All registers are word-sized.
 * AD7879 uses a high-byte first convention.
 */
static int ad7879_i2c_read(struct device *dev, u8 reg)
{
	struct i2c_client *client = to_i2c_client(dev);

	return i2c_smbus_read_word_swapped(client, reg);
}

static int ad7879_i2c_multi_read(struct device *dev,
				 u8 first_reg, u8 count, u16 *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	u8 idx;

	i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);

	for (idx = 0; idx < count; ++idx)
		buf[idx] = swab16(buf[idx]);

	return 0;
}

static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
{
	struct i2c_client *client = to_i2c_client(dev);

	return i2c_smbus_write_word_swapped(client, reg, val);
}

static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
	.bustype	= BUS_I2C,
	.read		= ad7879_i2c_read,
	.multi_read	= ad7879_i2c_multi_read,
	.write		= ad7879_i2c_write,
};

static int ad7879_i2c_probe(struct i2c_client *client,
				      const struct i2c_device_id *id)
{
	struct ad7879 *ts;

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_WORD_DATA)) {
		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
		return -EIO;
	}

	ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
			  &ad7879_i2c_bus_ops);
	if (IS_ERR(ts))
		return PTR_ERR(ts);

	i2c_set_clientdata(client, ts);

	return 0;
}

static int ad7879_i2c_remove(struct i2c_client *client)
{
	struct ad7879 *ts = i2c_get_clientdata(client);

	ad7879_remove(ts);

	return 0;
}

static const struct i2c_device_id ad7879_id[] = {
	{ "ad7879", 0 },
	{ "ad7889", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad7879_id);

#ifdef CONFIG_OF
static const struct of_device_id ad7879_i2c_dt_ids[] = {
	{ .compatible = "adi,ad7879-1", },
	{ }
};
MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
#endif

static struct i2c_driver ad7879_i2c_driver = {
	.driver = {
		.name	= "ad7879",
		.pm	= &ad7879_pm_ops,
		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
	},
	.probe		= ad7879_i2c_probe,
	.remove		= ad7879_i2c_remove,
	.id_table	= ad7879_id,
};

module_i2c_driver(ad7879_i2c_driver);

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
4397c98a MF	1	/*
	2	* AD7879-1/AD7889-1 touchscreen (I2C bus)
	3	*
	4	* Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
	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>
fa6e3ca2	13	#include <linux/of.h>
d5dc9ac3	14	#include <linux/pm.h>
4397c98a MF	15
	16	#include "ad7879.h"
	17
	18	#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
	19
4397c98a MF	20	/* All registers are word-sized.
	21	* AD7879 uses a high-byte first convention.
	22	*/
	23	static int ad7879_i2c_read(struct device *dev, u8 reg)
	24	{
	25	struct i2c_client *client = to_i2c_client(dev);
	26
75255b29	27	return i2c_smbus_read_word_swapped(client, reg);
4397c98a MF	28	}
	29
	30	static int ad7879_i2c_multi_read(struct device *dev,
	31	u8 first_reg, u8 count, u16 *buf)
	32	{
16ea10a7	33	struct i2c_client *client = to_i2c_client(dev);
4397c98a MF	34	u8 idx;
4397c98a MF	35
16ea10a7 MH	36	i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
16ea10a7 MH	37
4397c98a	38	for (idx = 0; idx < count; ++idx)
16ea10a7	39	buf[idx] = swab16(buf[idx]);
4397c98a MF	40
	41	return 0;
	42	}
	43
	44	static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
	45	{
	46	struct i2c_client *client = to_i2c_client(dev);
	47
75255b29	48	return i2c_smbus_write_word_swapped(client, reg, val);
4397c98a MF	49	}
	50
	51	static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
	52	.bustype = BUS_I2C,
	53	.read = ad7879_i2c_read,
	54	.multi_read = ad7879_i2c_multi_read,
	55	.write = ad7879_i2c_write,
	56	};
	57
5298cc4c	58	static int ad7879_i2c_probe(struct i2c_client *client,
4397c98a MF	59	const struct i2c_device_id *id)
	60	{
	61	struct ad7879 *ts;
	62
	63	if (!i2c_check_functionality(client->adapter,
	64	I2C_FUNC_SMBUS_WORD_DATA)) {
	65	dev_err(&client->dev, "SMBUS Word Data not Supported\n");
	66	return -EIO;
	67	}
	68
	69	ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
	70	&ad7879_i2c_bus_ops);
	71	if (IS_ERR(ts))
	72	return PTR_ERR(ts);
	73
	74	i2c_set_clientdata(client, ts);
	75
	76	return 0;
	77	}
	78
e2619cf7	79	static int ad7879_i2c_remove(struct i2c_client *client)
4397c98a MF	80	{
	81	struct ad7879 *ts = i2c_get_clientdata(client);
	82
	83	ad7879_remove(ts);
	84
	85	return 0;
	86	}
	87
	88	static const struct i2c_device_id ad7879_id[] = {
	89	{ "ad7879", 0 },
	90	{ "ad7889", 0 },
	91	{ }
	92	};
	93	MODULE_DEVICE_TABLE(i2c, ad7879_id);
	94
fa6e3ca2 SA	95	#ifdef CONFIG_OF
	96	static const struct of_device_id ad7879_i2c_dt_ids[] = {
	97	{ .compatible = "adi,ad7879-1", },
	98	{ }
	99	};
	100	MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
	101	#endif
	102
4397c98a MF	103	static struct i2c_driver ad7879_i2c_driver = {
	104	.driver = {
	105	.name = "ad7879",
8672bd93	106	.pm = &ad7879_pm_ops,
fa6e3ca2	107	.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
4397c98a MF	108	},
4397c98a MF	109	.probe = ad7879_i2c_probe,
1cb0aa88	110	.remove = ad7879_i2c_remove,
4397c98a MF	111	.id_table = ad7879_id,
	112	};
	113
1b92c1cf	114	module_i2c_driver(ad7879_i2c_driver);
4397c98a MF	115
	116	MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
	117	MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
	118	MODULE_LICENSE("GPL");