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		.pm	= &ad7879_pm_ops,
98	},
99	.probe		= ad7879_i2c_probe,
100	.remove		= ad7879_i2c_remove,
101	.id_table	= ad7879_id,
102};
103
104module_i2c_driver(ad7879_i2c_driver);
105
106MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
107MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
108MODULE_LICENSE("GPL");
109