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1 | /* |
2 | * AD714X CapTouch Programmable Controller driver (I2C bus) | |
3 | * | |
4 | * Copyright 2009 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 "ad714x.h" | |
14 | ||
15 | #ifdef CONFIG_PM | |
16 | static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message) | |
17 | { | |
18 | return ad714x_disable(i2c_get_clientdata(client)); | |
19 | } | |
20 | ||
21 | static int ad714x_i2c_resume(struct i2c_client *client) | |
22 | { | |
23 | return ad714x_enable(i2c_get_clientdata(client)); | |
24 | } | |
25 | #else | |
26 | # define ad714x_i2c_suspend NULL | |
27 | # define ad714x_i2c_resume NULL | |
28 | #endif | |
29 | ||
30 | static int ad714x_i2c_write(struct device *dev, unsigned short reg, | |
31 | unsigned short data) | |
32 | { | |
33 | struct i2c_client *client = to_i2c_client(dev); | |
34 | int ret = 0; | |
35 | u8 *_reg = (u8 *)® | |
36 | u8 *_data = (u8 *)&data; | |
37 | ||
38 | u8 tx[4] = { | |
39 | _reg[1], | |
40 | _reg[0], | |
41 | _data[1], | |
42 | _data[0] | |
43 | }; | |
44 | ||
45 | ret = i2c_master_send(client, tx, 4); | |
46 | if (ret < 0) | |
47 | dev_err(&client->dev, "I2C write error\n"); | |
48 | ||
49 | return ret; | |
50 | } | |
51 | ||
52 | static int ad714x_i2c_read(struct device *dev, unsigned short reg, | |
53 | unsigned short *data) | |
54 | { | |
55 | struct i2c_client *client = to_i2c_client(dev); | |
56 | int ret = 0; | |
57 | u8 *_reg = (u8 *)® | |
58 | u8 *_data = (u8 *)data; | |
59 | ||
60 | u8 tx[2] = { | |
61 | _reg[1], | |
62 | _reg[0] | |
63 | }; | |
64 | u8 rx[2]; | |
65 | ||
66 | ret = i2c_master_send(client, tx, 2); | |
67 | if (ret >= 0) | |
68 | ret = i2c_master_recv(client, rx, 2); | |
69 | ||
70 | if (unlikely(ret < 0)) { | |
71 | dev_err(&client->dev, "I2C read error\n"); | |
72 | } else { | |
73 | _data[0] = rx[1]; | |
74 | _data[1] = rx[0]; | |
75 | } | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
80 | static int __devinit ad714x_i2c_probe(struct i2c_client *client, | |
81 | const struct i2c_device_id *id) | |
82 | { | |
83 | struct ad714x_chip *chip; | |
84 | ||
85 | chip = ad714x_probe(&client->dev, BUS_I2C, client->irq, | |
86 | ad714x_i2c_read, ad714x_i2c_write); | |
87 | if (IS_ERR(chip)) | |
88 | return PTR_ERR(chip); | |
89 | ||
90 | i2c_set_clientdata(client, chip); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static int __devexit ad714x_i2c_remove(struct i2c_client *client) | |
96 | { | |
97 | struct ad714x_chip *chip = i2c_get_clientdata(client); | |
98 | ||
99 | ad714x_remove(chip); | |
100 | i2c_set_clientdata(client, NULL); | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static const struct i2c_device_id ad714x_id[] = { | |
106 | { "ad7142_captouch", 0 }, | |
107 | { "ad7147_captouch", 0 }, | |
108 | { } | |
109 | }; | |
110 | MODULE_DEVICE_TABLE(i2c, ad714x_id); | |
111 | ||
112 | static struct i2c_driver ad714x_i2c_driver = { | |
113 | .driver = { | |
114 | .name = "ad714x_captouch", | |
115 | }, | |
116 | .probe = ad714x_i2c_probe, | |
117 | .remove = __devexit_p(ad714x_i2c_remove), | |
118 | .suspend = ad714x_i2c_suspend, | |
119 | .resume = ad714x_i2c_resume, | |
120 | .id_table = ad714x_id, | |
121 | }; | |
122 | ||
123 | static __init int ad714x_i2c_init(void) | |
124 | { | |
125 | return i2c_add_driver(&ad714x_i2c_driver); | |
126 | } | |
127 | module_init(ad714x_i2c_init); | |
128 | ||
129 | static __exit void ad714x_i2c_exit(void) | |
130 | { | |
131 | i2c_del_driver(&ad714x_i2c_driver); | |
132 | } | |
133 | module_exit(ad714x_i2c_exit); | |
134 | ||
135 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); | |
136 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); | |
137 | MODULE_LICENSE("GPL"); |