1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * AD7879-1/AD7889-1 touchscreen (I2C bus)
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/input.h> /* BUS_I2C */
9*4882a593Smuzhiyun #include <linux/i2c.h>
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/of.h>
13*4882a593Smuzhiyun #include <linux/pm.h>
14*4882a593Smuzhiyun #include <linux/regmap.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "ad7879.h"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define AD7879_DEVID 0x79 /* AD7879-1/AD7889-1 */
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun static const struct regmap_config ad7879_i2c_regmap_config = {
21*4882a593Smuzhiyun .reg_bits = 8,
22*4882a593Smuzhiyun .val_bits = 16,
23*4882a593Smuzhiyun .max_register = 15,
24*4882a593Smuzhiyun };
25*4882a593Smuzhiyun
ad7879_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)26*4882a593Smuzhiyun static int ad7879_i2c_probe(struct i2c_client *client,
27*4882a593Smuzhiyun const struct i2c_device_id *id)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct regmap *regmap;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun if (!i2c_check_functionality(client->adapter,
32*4882a593Smuzhiyun I2C_FUNC_SMBUS_WORD_DATA)) {
33*4882a593Smuzhiyun dev_err(&client->dev, "SMBUS Word Data not Supported\n");
34*4882a593Smuzhiyun return -EIO;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
38*4882a593Smuzhiyun if (IS_ERR(regmap))
39*4882a593Smuzhiyun return PTR_ERR(regmap);
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun return ad7879_probe(&client->dev, regmap, client->irq,
42*4882a593Smuzhiyun BUS_I2C, AD7879_DEVID);
43*4882a593Smuzhiyun }
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun static const struct i2c_device_id ad7879_id[] = {
46*4882a593Smuzhiyun { "ad7879", 0 },
47*4882a593Smuzhiyun { "ad7889", 0 },
48*4882a593Smuzhiyun { }
49*4882a593Smuzhiyun };
50*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, ad7879_id);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun #ifdef CONFIG_OF
53*4882a593Smuzhiyun static const struct of_device_id ad7879_i2c_dt_ids[] = {
54*4882a593Smuzhiyun { .compatible = "adi,ad7879-1", },
55*4882a593Smuzhiyun { }
56*4882a593Smuzhiyun };
57*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
58*4882a593Smuzhiyun #endif
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static struct i2c_driver ad7879_i2c_driver = {
61*4882a593Smuzhiyun .driver = {
62*4882a593Smuzhiyun .name = "ad7879",
63*4882a593Smuzhiyun .pm = &ad7879_pm_ops,
64*4882a593Smuzhiyun .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
65*4882a593Smuzhiyun },
66*4882a593Smuzhiyun .probe = ad7879_i2c_probe,
67*4882a593Smuzhiyun .id_table = ad7879_id,
68*4882a593Smuzhiyun };
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun module_i2c_driver(ad7879_i2c_driver);
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
73*4882a593Smuzhiyun MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
74*4882a593Smuzhiyun MODULE_LICENSE("GPL");
75