1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * AD714X CapTouch Programmable Controller driver (I2C bus)
4 *
5 * Copyright 2009-2011 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/pm.h>
13#include "ad714x.h"
14
15static int ad714x_i2c_write(struct ad714x_chip *chip,
16			    unsigned short reg, unsigned short data)
17{
18	struct i2c_client *client = to_i2c_client(chip->dev);
19	int error;
20
21	chip->xfer_buf[0] = cpu_to_be16(reg);
22	chip->xfer_buf[1] = cpu_to_be16(data);
23
24	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
25				2 * sizeof(*chip->xfer_buf));
26	if (unlikely(error < 0)) {
27		dev_err(&client->dev, "I2C write error: %d\n", error);
28		return error;
29	}
30
31	return 0;
32}
33
34static int ad714x_i2c_read(struct ad714x_chip *chip,
35			   unsigned short reg, unsigned short *data, size_t len)
36{
37	struct i2c_client *client = to_i2c_client(chip->dev);
38	int i;
39	int error;
40
41	chip->xfer_buf[0] = cpu_to_be16(reg);
42
43	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
44				sizeof(*chip->xfer_buf));
45	if (error >= 0)
46		error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
47					len * sizeof(*chip->xfer_buf));
48
49	if (unlikely(error < 0)) {
50		dev_err(&client->dev, "I2C read error: %d\n", error);
51		return error;
52	}
53
54	for (i = 0; i < len; i++)
55		data[i] = be16_to_cpu(chip->xfer_buf[i]);
56
57	return 0;
58}
59
60static int ad714x_i2c_probe(struct i2c_client *client)
61{
62	struct ad714x_chip *chip;
63
64	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
65			    ad714x_i2c_read, ad714x_i2c_write);
66	if (IS_ERR(chip))
67		return PTR_ERR(chip);
68
69	i2c_set_clientdata(client, chip);
70
71	return 0;
72}
73
74static const struct i2c_device_id ad714x_id[] = {
75	{ "ad7142_captouch", 0 },
76	{ "ad7143_captouch", 0 },
77	{ "ad7147_captouch", 0 },
78	{ "ad7147a_captouch", 0 },
79	{ "ad7148_captouch", 0 },
80	{ }
81};
82MODULE_DEVICE_TABLE(i2c, ad714x_id);
83
84static struct i2c_driver ad714x_i2c_driver = {
85	.driver = {
86		.name = "ad714x_captouch",
87		.pm   = pm_sleep_ptr(&ad714x_pm),
88	},
89	.probe = ad714x_i2c_probe,
90	.id_table = ad714x_id,
91};
92
93module_i2c_driver(ad714x_i2c_driver);
94
95MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
96MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
97MODULE_LICENSE("GPL");
98