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

 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>
13#include <linux/of.h>
14#include <linux/pm.h>
15#include <linux/regmap.h>
16
17#include "ad7879.h"
18
19#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
20
21static const struct regmap_config ad7879_i2c_regmap_config = {
22	.reg_bits = 8,
23	.val_bits = 16,
24	.max_register = 15,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
25};
26
27static int ad7879_i2c_probe(struct i2c_client *client,
28				      const struct i2c_device_id *id)
29{
30	struct regmap *regmap;
31
32	if (!i2c_check_functionality(client->adapter,
33				     I2C_FUNC_SMBUS_WORD_DATA)) {
34		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
35		return -EIO;
36	}
37
38	regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
39	if (IS_ERR(regmap))
40		return PTR_ERR(regmap);
 
 
 
41
42	return ad7879_probe(&client->dev, regmap, client->irq,
43			    BUS_I2C, AD7879_DEVID);
 
 
 
 
 
 
 
 
44}
45
46static const struct i2c_device_id ad7879_id[] = {
47	{ "ad7879", 0 },
48	{ "ad7889", 0 },
49	{ }
50};
51MODULE_DEVICE_TABLE(i2c, ad7879_id);
52
53#ifdef CONFIG_OF
54static const struct of_device_id ad7879_i2c_dt_ids[] = {
55	{ .compatible = "adi,ad7879-1", },
56	{ }
57};
58MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
59#endif
60
61static struct i2c_driver ad7879_i2c_driver = {
62	.driver = {
63		.name	= "ad7879",
 
64		.pm	= &ad7879_pm_ops,
65		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
66	},
67	.probe		= ad7879_i2c_probe,
 
68	.id_table	= ad7879_id,
69};
70
71module_i2c_driver(ad7879_i2c_driver);
72
73MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
74MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
75MODULE_LICENSE("GPL");