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4397c98a MF |
1 | /* |
2 | * AD7879-1/AD7889-1 touchscreen (I2C bus) | |
3 | * | |
4 | * Copyright (C) 2008-2010 Michael Hennerich, 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> | |
fa6e3ca2 | 13 | #include <linux/of.h> |
d5dc9ac3 | 14 | #include <linux/pm.h> |
4397c98a MF |
15 | |
16 | #include "ad7879.h" | |
17 | ||
18 | #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */ | |
19 | ||
4397c98a MF |
20 | /* All registers are word-sized. |
21 | * AD7879 uses a high-byte first convention. | |
22 | */ | |
23 | static int ad7879_i2c_read(struct device *dev, u8 reg) | |
24 | { | |
25 | struct i2c_client *client = to_i2c_client(dev); | |
26 | ||
75255b29 | 27 | return i2c_smbus_read_word_swapped(client, reg); |
4397c98a MF |
28 | } |
29 | ||
30 | static int ad7879_i2c_multi_read(struct device *dev, | |
31 | u8 first_reg, u8 count, u16 *buf) | |
32 | { | |
16ea10a7 | 33 | struct i2c_client *client = to_i2c_client(dev); |
4397c98a MF |
34 | u8 idx; |
35 | ||
16ea10a7 MH |
36 | i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf); |
37 | ||
4397c98a | 38 | for (idx = 0; idx < count; ++idx) |
16ea10a7 | 39 | buf[idx] = swab16(buf[idx]); |
4397c98a MF |
40 | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val) | |
45 | { | |
46 | struct i2c_client *client = to_i2c_client(dev); | |
47 | ||
75255b29 | 48 | return i2c_smbus_write_word_swapped(client, reg, val); |
4397c98a MF |
49 | } |
50 | ||
51 | static const struct ad7879_bus_ops ad7879_i2c_bus_ops = { | |
52 | .bustype = BUS_I2C, | |
53 | .read = ad7879_i2c_read, | |
54 | .multi_read = ad7879_i2c_multi_read, | |
55 | .write = ad7879_i2c_write, | |
56 | }; | |
57 | ||
5298cc4c | 58 | static int ad7879_i2c_probe(struct i2c_client *client, |
4397c98a MF |
59 | const struct i2c_device_id *id) |
60 | { | |
61 | struct ad7879 *ts; | |
62 | ||
63 | if (!i2c_check_functionality(client->adapter, | |
64 | I2C_FUNC_SMBUS_WORD_DATA)) { | |
65 | dev_err(&client->dev, "SMBUS Word Data not Supported\n"); | |
66 | return -EIO; | |
67 | } | |
68 | ||
69 | ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq, | |
70 | &ad7879_i2c_bus_ops); | |
71 | if (IS_ERR(ts)) | |
72 | return PTR_ERR(ts); | |
73 | ||
74 | i2c_set_clientdata(client, ts); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
e2619cf7 | 79 | static int ad7879_i2c_remove(struct i2c_client *client) |
4397c98a MF |
80 | { |
81 | struct ad7879 *ts = i2c_get_clientdata(client); | |
82 | ||
83 | ad7879_remove(ts); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static const struct i2c_device_id ad7879_id[] = { | |
89 | { "ad7879", 0 }, | |
90 | { "ad7889", 0 }, | |
91 | { } | |
92 | }; | |
93 | MODULE_DEVICE_TABLE(i2c, ad7879_id); | |
94 | ||
fa6e3ca2 SA |
95 | #ifdef CONFIG_OF |
96 | static const struct of_device_id ad7879_i2c_dt_ids[] = { | |
97 | { .compatible = "adi,ad7879-1", }, | |
98 | { } | |
99 | }; | |
100 | MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids); | |
101 | #endif | |
102 | ||
4397c98a MF |
103 | static struct i2c_driver ad7879_i2c_driver = { |
104 | .driver = { | |
105 | .name = "ad7879", | |
8672bd93 | 106 | .pm = &ad7879_pm_ops, |
fa6e3ca2 | 107 | .of_match_table = of_match_ptr(ad7879_i2c_dt_ids), |
4397c98a MF |
108 | }, |
109 | .probe = ad7879_i2c_probe, | |
1cb0aa88 | 110 | .remove = ad7879_i2c_remove, |
4397c98a MF |
111 | .id_table = ad7879_id, |
112 | }; | |
113 | ||
1b92c1cf | 114 | module_i2c_driver(ad7879_i2c_driver); |
4397c98a MF |
115 | |
116 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
117 | MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver"); | |
118 | MODULE_LICENSE("GPL"); |