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 #include <linux/regmap.h>
16 
17 #include "ad7879.h"
18 
19 #define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
20 
21 static const struct regmap_config ad7879_i2c_regmap_config = {
22 	.reg_bits = 8,
23 	.val_bits = 16,
24 	.max_register = 15,
25 };
26 
27 static int ad7879_i2c_probe(struct i2c_client *client,
28 				      const struct i2c_device_id *id)
29 {
30 	struct regmap *regmap;
31 
32 	if (!i2c_check_functionality(client->adapter,
33 				     I2C_FUNC_SMBUS_WORD_DATA)) {
34 		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
35 		return -EIO;
36 	}
37 
38 	regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
39 	if (IS_ERR(regmap))
40 		return PTR_ERR(regmap);
41 
42 	return ad7879_probe(&client->dev, regmap, client->irq,
43 			    BUS_I2C, AD7879_DEVID);
44 }
45 
46 static const struct i2c_device_id ad7879_id[] = {
47 	{ "ad7879", 0 },
48 	{ "ad7889", 0 },
49 	{ }
50 };
51 MODULE_DEVICE_TABLE(i2c, ad7879_id);
52 
53 #ifdef CONFIG_OF
54 static const struct of_device_id ad7879_i2c_dt_ids[] = {
55 	{ .compatible = "adi,ad7879-1", },
56 	{ }
57 };
58 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
59 #endif
60 
61 static struct i2c_driver ad7879_i2c_driver = {
62 	.driver = {
63 		.name	= "ad7879",
64 		.pm	= &ad7879_pm_ops,
65 		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
66 	},
67 	.probe		= ad7879_i2c_probe,
68 	.id_table	= ad7879_id,
69 };
70 
71 module_i2c_driver(ad7879_i2c_driver);
72 
73 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
74 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
75 MODULE_LICENSE("GPL");
76