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 ad7879 *ts;
31 	struct regmap *regmap;
32 
33 	if (!i2c_check_functionality(client->adapter,
34 				     I2C_FUNC_SMBUS_WORD_DATA)) {
35 		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
36 		return -EIO;
37 	}
38 
39 	regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
40 	if (IS_ERR(regmap))
41 		return PTR_ERR(regmap);
42 
43 	ts = ad7879_probe(&client->dev, regmap, client->irq,
44 			  BUS_I2C, AD7879_DEVID);
45 	if (IS_ERR(ts))
46 		return PTR_ERR(ts);
47 
48 	i2c_set_clientdata(client, ts);
49 
50 	return 0;
51 }
52 
53 static int ad7879_i2c_remove(struct i2c_client *client)
54 {
55 	struct ad7879 *ts = i2c_get_clientdata(client);
56 
57 	ad7879_remove(ts);
58 
59 	return 0;
60 }
61 
62 static const struct i2c_device_id ad7879_id[] = {
63 	{ "ad7879", 0 },
64 	{ "ad7889", 0 },
65 	{ }
66 };
67 MODULE_DEVICE_TABLE(i2c, ad7879_id);
68 
69 #ifdef CONFIG_OF
70 static const struct of_device_id ad7879_i2c_dt_ids[] = {
71 	{ .compatible = "adi,ad7879-1", },
72 	{ }
73 };
74 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
75 #endif
76 
77 static struct i2c_driver ad7879_i2c_driver = {
78 	.driver = {
79 		.name	= "ad7879",
80 		.pm	= &ad7879_pm_ops,
81 		.of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
82 	},
83 	.probe		= ad7879_i2c_probe,
84 	.remove		= ad7879_i2c_remove,
85 	.id_table	= ad7879_id,
86 };
87 
88 module_i2c_driver(ad7879_i2c_driver);
89 
90 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
91 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
92 MODULE_LICENSE("GPL");
93