1/*
2 * AD714X CapTouch Programmable Controller driver (I2C bus)
3 *
4 * Copyright 2009-2011 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#include "ad714x.h"
15
16static int __maybe_unused ad714x_i2c_suspend(struct device *dev)
17{
18	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
19}
20
21static int __maybe_unused ad714x_i2c_resume(struct device *dev)
22{
23	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
24}
25
26static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
27
28static int ad714x_i2c_write(struct ad714x_chip *chip,
29			    unsigned short reg, unsigned short data)
30{
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;
45}
46
47static int ad714x_i2c_read(struct ad714x_chip *chip,
48			   unsigned short reg, unsigned short *data, size_t len)
49{
50	struct i2c_client *client = to_i2c_client(chip->dev);
51	int i;
52	int error;
53
54	chip->xfer_buf[0] = cpu_to_be16(reg);
55
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,
60					len * sizeof(*chip->xfer_buf));
61
62	if (unlikely(error < 0)) {
63		dev_err(&client->dev, "I2C read error: %d\n", error);
64		return error;
65	}
66
67	for (i = 0; i < len; i++)
68		data[i] = be16_to_cpu(chip->xfer_buf[i]);
69
70	return 0;
71}
72
73static int ad714x_i2c_probe(struct i2c_client *client,
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
88static int ad714x_i2c_remove(struct i2c_client *client)
89{
90	struct ad714x_chip *chip = i2c_get_clientdata(client);
91
92	ad714x_remove(chip);
93
94	return 0;
95}
96
97static const struct i2c_device_id ad714x_id[] = {
98	{ "ad7142_captouch", 0 },
99	{ "ad7143_captouch", 0 },
100	{ "ad7147_captouch", 0 },
101	{ "ad7147a_captouch", 0 },
102	{ "ad7148_captouch", 0 },
103	{ }
104};
105MODULE_DEVICE_TABLE(i2c, ad714x_id);
106
107static struct i2c_driver ad714x_i2c_driver = {
108	.driver = {
109		.name = "ad714x_captouch",
110		.pm   = &ad714x_i2c_pm,
111	},
112	.probe    = ad714x_i2c_probe,
113	.remove   = ad714x_i2c_remove,
114	.id_table = ad714x_id,
115};
116
117module_i2c_driver(ad714x_i2c_driver);
118
119MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
120MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
121MODULE_LICENSE("GPL");
122