2 * AD7879-1/AD7889-1 touchscreen (I2C bus)
4 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/input.h> /* BUS_I2C */
10 #include <linux/i2c.h>
11 #include <linux/module.h>
12 #include <linux/types.h>
16 #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
19 static int ad7879_i2c_suspend(struct i2c_client *client, pm_message_t message)
21 struct ad7879 *ts = i2c_get_clientdata(client);
28 static int ad7879_i2c_resume(struct i2c_client *client)
30 struct ad7879 *ts = i2c_get_clientdata(client);
37 # define ad7879_i2c_suspend NULL
38 # define ad7879_i2c_resume NULL
41 /* All registers are word-sized.
42 * AD7879 uses a high-byte first convention.
44 static int ad7879_i2c_read(struct device *dev, u8 reg)
46 struct i2c_client *client = to_i2c_client(dev);
48 return swab16(i2c_smbus_read_word_data(client, reg));
51 static int ad7879_i2c_multi_read(struct device *dev,
52 u8 first_reg, u8 count, u16 *buf)
56 for (idx = 0; idx < count; ++idx)
57 buf[idx] = ad7879_i2c_read(dev, first_reg + idx);
62 static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
64 struct i2c_client *client = to_i2c_client(dev);
66 return i2c_smbus_write_word_data(client, reg, swab16(val));
69 static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
71 .read = ad7879_i2c_read,
72 .multi_read = ad7879_i2c_multi_read,
73 .write = ad7879_i2c_write,
76 static int __devinit ad7879_i2c_probe(struct i2c_client *client,
77 const struct i2c_device_id *id)
81 if (!i2c_check_functionality(client->adapter,
82 I2C_FUNC_SMBUS_WORD_DATA)) {
83 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
87 ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
92 i2c_set_clientdata(client, ts);
97 static int __devexit ad7879_i2c_remove(struct i2c_client *client)
99 struct ad7879 *ts = i2c_get_clientdata(client);
106 static const struct i2c_device_id ad7879_id[] = {
111 MODULE_DEVICE_TABLE(i2c, ad7879_id);
113 static struct i2c_driver ad7879_i2c_driver = {
116 .owner = THIS_MODULE,
118 .probe = ad7879_i2c_probe,
119 .remove = __devexit_p(ad7879_i2c_remove),
120 .suspend = ad7879_i2c_suspend,
121 .resume = ad7879_i2c_resume,
122 .id_table = ad7879_id,
125 static int __init ad7879_i2c_init(void)
127 return i2c_add_driver(&ad7879_i2c_driver);
129 module_init(ad7879_i2c_init);
131 static void __exit ad7879_i2c_exit(void)
133 i2c_del_driver(&ad7879_i2c_driver);
135 module_exit(ad7879_i2c_exit);
137 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
138 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
139 MODULE_LICENSE("GPL");
140 MODULE_ALIAS("i2c:ad7879");