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1 | /* |
2 | * AD714X CapTouch Programmable Controller driver (I2C bus) | |
3 | * | |
9eff794b | 4 | * Copyright 2009-2011 Analog Devices Inc. |
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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> | |
6b7cfd19 | 13 | #include <linux/pm.h> |
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14 | #include "ad714x.h" |
15 | ||
97a652a8 | 16 | static int __maybe_unused ad714x_i2c_suspend(struct device *dev) |
31a62963 | 17 | { |
6b7cfd19 | 18 | return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev))); |
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19 | } |
20 | ||
97a652a8 | 21 | static int __maybe_unused ad714x_i2c_resume(struct device *dev) |
31a62963 | 22 | { |
6b7cfd19 | 23 | return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev))); |
31a62963 | 24 | } |
31a62963 | 25 | |
6b7cfd19 MB |
26 | static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume); |
27 | ||
c0409feb DT |
28 | static int ad714x_i2c_write(struct ad714x_chip *chip, |
29 | unsigned short reg, unsigned short data) | |
31a62963 | 30 | { |
c0409feb DT |
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; | |
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45 | } |
46 | ||
c0409feb | 47 | static int ad714x_i2c_read(struct ad714x_chip *chip, |
9eff794b | 48 | unsigned short reg, unsigned short *data, size_t len) |
31a62963 | 49 | { |
c0409feb | 50 | struct i2c_client *client = to_i2c_client(chip->dev); |
9eff794b | 51 | int i; |
c0409feb DT |
52 | int error; |
53 | ||
54 | chip->xfer_buf[0] = cpu_to_be16(reg); | |
31a62963 | 55 | |
c0409feb DT |
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, | |
9eff794b | 60 | len * sizeof(*chip->xfer_buf)); |
31a62963 | 61 | |
c0409feb DT |
62 | if (unlikely(error < 0)) { |
63 | dev_err(&client->dev, "I2C read error: %d\n", error); | |
64 | return error; | |
31a62963 BW |
65 | } |
66 | ||
9eff794b MH |
67 | for (i = 0; i < len; i++) |
68 | data[i] = be16_to_cpu(chip->xfer_buf[i]); | |
69 | ||
c0409feb | 70 | return 0; |
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71 | } |
72 | ||
5298cc4c | 73 | static int ad714x_i2c_probe(struct i2c_client *client, |
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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 | ||
e2619cf7 | 88 | static int ad714x_i2c_remove(struct i2c_client *client) |
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89 | { |
90 | struct ad714x_chip *chip = i2c_get_clientdata(client); | |
91 | ||
92 | ad714x_remove(chip); | |
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93 | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static const struct i2c_device_id ad714x_id[] = { | |
98 | { "ad7142_captouch", 0 }, | |
6c04d7b3 | 99 | { "ad7143_captouch", 0 }, |
31a62963 | 100 | { "ad7147_captouch", 0 }, |
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101 | { "ad7147a_captouch", 0 }, |
102 | { "ad7148_captouch", 0 }, | |
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103 | { } |
104 | }; | |
105 | MODULE_DEVICE_TABLE(i2c, ad714x_id); | |
106 | ||
107 | static struct i2c_driver ad714x_i2c_driver = { | |
108 | .driver = { | |
109 | .name = "ad714x_captouch", | |
6b7cfd19 | 110 | .pm = &ad714x_i2c_pm, |
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111 | }, |
112 | .probe = ad714x_i2c_probe, | |
1cb0aa88 | 113 | .remove = ad714x_i2c_remove, |
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114 | .id_table = ad714x_id, |
115 | }; | |
116 | ||
1b92c1cf | 117 | module_i2c_driver(ad714x_i2c_driver); |
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118 | |
119 | MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver"); | |
120 | MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); | |
121 | MODULE_LICENSE("GPL"); |