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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>
13#include <linux/pm.h>
14
15#include "ad7879.h"
16
17#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
18
19#ifdef CONFIG_PM
20static int ad7879_i2c_suspend(struct device *dev)
21{
22 struct i2c_client *client = to_i2c_client(dev);
23 struct ad7879 *ts = i2c_get_clientdata(client);
24
25 ad7879_suspend(ts);
26
27 return 0;
28}
29
30static int ad7879_i2c_resume(struct device *dev)
31{
32 struct i2c_client *client = to_i2c_client(dev);
33 struct ad7879 *ts = i2c_get_clientdata(client);
34
35 ad7879_resume(ts);
36
37 return 0;
38}
39
40static SIMPLE_DEV_PM_OPS(ad7879_i2c_pm, ad7879_i2c_suspend, ad7879_i2c_resume);
41#endif
42
43/* All registers are word-sized.
44 * AD7879 uses a high-byte first convention.
45 */
46static int ad7879_i2c_read(struct device *dev, u8 reg)
47{
48 struct i2c_client *client = to_i2c_client(dev);
49
50 return swab16(i2c_smbus_read_word_data(client, reg));
51}
52
53static int ad7879_i2c_multi_read(struct device *dev,
54 u8 first_reg, u8 count, u16 *buf)
55{
56 struct i2c_client *client = to_i2c_client(dev);
57 u8 idx;
58
59 i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
60
61 for (idx = 0; idx < count; ++idx)
62 buf[idx] = swab16(buf[idx]);
63
64 return 0;
65}
66
67static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
68{
69 struct i2c_client *client = to_i2c_client(dev);
70
71 return i2c_smbus_write_word_data(client, reg, swab16(val));
72}
73
74static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
75 .bustype = BUS_I2C,
76 .read = ad7879_i2c_read,
77 .multi_read = ad7879_i2c_multi_read,
78 .write = ad7879_i2c_write,
79};
80
81static int __devinit ad7879_i2c_probe(struct i2c_client *client,
82 const struct i2c_device_id *id)
83{
84 struct ad7879 *ts;
85
86 if (!i2c_check_functionality(client->adapter,
87 I2C_FUNC_SMBUS_WORD_DATA)) {
88 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
89 return -EIO;
90 }
91
92 ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
93 &ad7879_i2c_bus_ops);
94 if (IS_ERR(ts))
95 return PTR_ERR(ts);
96
97 i2c_set_clientdata(client, ts);
98
99 return 0;
100}
101
102static int __devexit ad7879_i2c_remove(struct i2c_client *client)
103{
104 struct ad7879 *ts = i2c_get_clientdata(client);
105
106 ad7879_remove(ts);
107
108 return 0;
109}
110
111static const struct i2c_device_id ad7879_id[] = {
112 { "ad7879", 0 },
113 { "ad7889", 0 },
114 { }
115};
116MODULE_DEVICE_TABLE(i2c, ad7879_id);
117
118static struct i2c_driver ad7879_i2c_driver = {
119 .driver = {
120 .name = "ad7879",
121 .owner = THIS_MODULE,
122#ifdef CONFIG_PM
123 .pm = &ad7879_i2c_pm,
124#endif
125 },
126 .probe = ad7879_i2c_probe,
127 .remove = __devexit_p(ad7879_i2c_remove),
128 .id_table = ad7879_id,
129};
130
131static int __init ad7879_i2c_init(void)
132{
133 return i2c_add_driver(&ad7879_i2c_driver);
134}
135module_init(ad7879_i2c_init);
136
137static void __exit ad7879_i2c_exit(void)
138{
139 i2c_del_driver(&ad7879_i2c_driver);
140}
141module_exit(ad7879_i2c_exit);
142
143MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
144MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
145MODULE_LICENSE("GPL");
146MODULE_ALIAS("i2c:ad7879");
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>
13#include <linux/of.h>
14#include <linux/pm.h>
15
16#include "ad7879.h"
17
18#define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
19
20/* All registers are word-sized.
21 * AD7879 uses a high-byte first convention.
22 */
23static int ad7879_i2c_read(struct device *dev, u8 reg)
24{
25 struct i2c_client *client = to_i2c_client(dev);
26
27 return i2c_smbus_read_word_swapped(client, reg);
28}
29
30static int ad7879_i2c_multi_read(struct device *dev,
31 u8 first_reg, u8 count, u16 *buf)
32{
33 struct i2c_client *client = to_i2c_client(dev);
34 u8 idx;
35
36 i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
37
38 for (idx = 0; idx < count; ++idx)
39 buf[idx] = swab16(buf[idx]);
40
41 return 0;
42}
43
44static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
45{
46 struct i2c_client *client = to_i2c_client(dev);
47
48 return i2c_smbus_write_word_swapped(client, reg, val);
49}
50
51static 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
58static int ad7879_i2c_probe(struct i2c_client *client,
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
79static int ad7879_i2c_remove(struct i2c_client *client)
80{
81 struct ad7879 *ts = i2c_get_clientdata(client);
82
83 ad7879_remove(ts);
84
85 return 0;
86}
87
88static const struct i2c_device_id ad7879_id[] = {
89 { "ad7879", 0 },
90 { "ad7889", 0 },
91 { }
92};
93MODULE_DEVICE_TABLE(i2c, ad7879_id);
94
95#ifdef CONFIG_OF
96static const struct of_device_id ad7879_i2c_dt_ids[] = {
97 { .compatible = "adi,ad7879-1", },
98 { }
99};
100MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
101#endif
102
103static struct i2c_driver ad7879_i2c_driver = {
104 .driver = {
105 .name = "ad7879",
106 .pm = &ad7879_pm_ops,
107 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
108 },
109 .probe = ad7879_i2c_probe,
110 .remove = ad7879_i2c_remove,
111 .id_table = ad7879_id,
112};
113
114module_i2c_driver(ad7879_i2c_driver);
115
116MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
117MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
118MODULE_LICENSE("GPL");