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
16#ifdef CONFIG_PM_SLEEP
17static int ad714x_i2c_suspend(struct device *dev)
18{
19	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
20}
21
22static int ad714x_i2c_resume(struct device *dev)
23{
24	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
25}
26#endif
27
28static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
29
30static int ad714x_i2c_write(struct ad714x_chip *chip,
31			    unsigned short reg, unsigned short data)
32{
33	struct i2c_client *client = to_i2c_client(chip->dev);
34	int error;
35
36	chip->xfer_buf[0] = cpu_to_be16(reg);
37	chip->xfer_buf[1] = cpu_to_be16(data);
38
39	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
40				2 * sizeof(*chip->xfer_buf));
41	if (unlikely(error < 0)) {
42		dev_err(&client->dev, "I2C write error: %d\n", error);
43		return error;
44	}
45
46	return 0;
47}
48
49static int ad714x_i2c_read(struct ad714x_chip *chip,
50			   unsigned short reg, unsigned short *data, size_t len)
51{
52	struct i2c_client *client = to_i2c_client(chip->dev);
53	int i;
54	int error;
55
56	chip->xfer_buf[0] = cpu_to_be16(reg);
57
58	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
59				sizeof(*chip->xfer_buf));
60	if (error >= 0)
61		error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
62					len * sizeof(*chip->xfer_buf));
63
64	if (unlikely(error < 0)) {
65		dev_err(&client->dev, "I2C read error: %d\n", error);
66		return error;
67	}
68
69	for (i = 0; i < len; i++)
70		data[i] = be16_to_cpu(chip->xfer_buf[i]);
71
72	return 0;
73}
74
75static int ad714x_i2c_probe(struct i2c_client *client,
76					const struct i2c_device_id *id)
77{
78	struct ad714x_chip *chip;
79
80	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
81			    ad714x_i2c_read, ad714x_i2c_write);
82	if (IS_ERR(chip))
83		return PTR_ERR(chip);
84
85	i2c_set_clientdata(client, chip);
86
87	return 0;
88}
89
90static int ad714x_i2c_remove(struct i2c_client *client)
91{
92	struct ad714x_chip *chip = i2c_get_clientdata(client);
93
94	ad714x_remove(chip);
95
96	return 0;
97}
98
99static const struct i2c_device_id ad714x_id[] = {
100	{ "ad7142_captouch", 0 },
101	{ "ad7143_captouch", 0 },
102	{ "ad7147_captouch", 0 },
103	{ "ad7147a_captouch", 0 },
104	{ "ad7148_captouch", 0 },
105	{ }
106};
107MODULE_DEVICE_TABLE(i2c, ad714x_id);
108
109static struct i2c_driver ad714x_i2c_driver = {
110	.driver = {
111		.name = "ad714x_captouch",
112		.pm   = &ad714x_i2c_pm,
113	},
114	.probe    = ad714x_i2c_probe,
115	.remove   = ad714x_i2c_remove,
116	.id_table = ad714x_id,
117};
118
119module_i2c_driver(ad714x_i2c_driver);
120
121MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
122MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
123MODULE_LICENSE("GPL");
124