summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/ad714x-i2c.c
blob: 2bef8fa56c948e0ba4305ea0f4f22450244f79d4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/*
 * AD714X CapTouch Programmable Controller driver (I2C bus)
 *
 * Copyright 2009 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 "ad714x.h"

#ifdef CONFIG_PM
static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message)
{
	return ad714x_disable(i2c_get_clientdata(client));
}

static int ad714x_i2c_resume(struct i2c_client *client)
{
	return ad714x_enable(i2c_get_clientdata(client));
}
#else
# define ad714x_i2c_suspend NULL
# define ad714x_i2c_resume  NULL
#endif

static int ad714x_i2c_write(struct device *dev, unsigned short reg,
				unsigned short data)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret = 0;
	u8 *_reg = (u8 *)&reg;
	u8 *_data = (u8 *)&data;

	u8 tx[4] = {
		_reg[1],
		_reg[0],
		_data[1],
		_data[0]
	};

	ret = i2c_master_send(client, tx, 4);
	if (ret < 0)
		dev_err(&client->dev, "I2C write error\n");

	return ret;
}

static int ad714x_i2c_read(struct device *dev, unsigned short reg,
				unsigned short *data)
{
	struct i2c_client *client = to_i2c_client(dev);
	int ret = 0;
	u8 *_reg = (u8 *)&reg;
	u8 *_data = (u8 *)data;

	u8 tx[2] = {
		_reg[1],
		_reg[0]
	};
	u8 rx[2];

	ret = i2c_master_send(client, tx, 2);
	if (ret >= 0)
		ret = i2c_master_recv(client, rx, 2);

	if (unlikely(ret < 0)) {
		dev_err(&client->dev, "I2C read error\n");
	} else {
		_data[0] = rx[1];
		_data[1] = rx[0];
	}

	return ret;
}

static int __devinit ad714x_i2c_probe(struct i2c_client *client,
					const struct i2c_device_id *id)
{
	struct ad714x_chip *chip;

	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
			    ad714x_i2c_read, ad714x_i2c_write);
	if (IS_ERR(chip))
		return PTR_ERR(chip);

	i2c_set_clientdata(client, chip);

	return 0;
}

static int __devexit ad714x_i2c_remove(struct i2c_client *client)
{
	struct ad714x_chip *chip = i2c_get_clientdata(client);

	ad714x_remove(chip);

	return 0;
}

static const struct i2c_device_id ad714x_id[] = {
	{ "ad7142_captouch", 0 },
	{ "ad7143_captouch", 0 },
	{ "ad7147_captouch", 0 },
	{ "ad7147a_captouch", 0 },
	{ "ad7148_captouch", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad714x_id);

static struct i2c_driver ad714x_i2c_driver = {
	.driver = {
		.name = "ad714x_captouch",
	},
	.probe    = ad714x_i2c_probe,
	.remove   = __devexit_p(ad714x_i2c_remove),
	.suspend  = ad714x_i2c_suspend,
	.resume	  = ad714x_i2c_resume,
	.id_table = ad714x_id,
};

static __init int ad714x_i2c_init(void)
{
	return i2c_add_driver(&ad714x_i2c_driver);
}
module_init(ad714x_i2c_init);

static __exit void ad714x_i2c_exit(void)
{
	i2c_del_driver(&ad714x_i2c_driver);
}
module_exit(ad714x_i2c_exit);

MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_LICENSE("GPL");