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