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 __maybe_unused ad714x_i2c_suspend(struct device *dev)
16{
17	return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
18}
19
20static int __maybe_unused ad714x_i2c_resume(struct device *dev)
21{
22	return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
23}
24
25static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
26
27static int ad714x_i2c_write(struct ad714x_chip *chip,
28			    unsigned short reg, unsigned short data)
29{
30	struct i2c_client *client = to_i2c_client(chip->dev);
31	int error;
32
33	chip->xfer_buf[0] = cpu_to_be16(reg);
34	chip->xfer_buf[1] = cpu_to_be16(data);
35
36	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
37				2 * sizeof(*chip->xfer_buf));
38	if (unlikely(error < 0)) {
39		dev_err(&client->dev, "I2C write error: %d\n", error);
40		return error;
41	}
42
43	return 0;
44}
45
46static int ad714x_i2c_read(struct ad714x_chip *chip,
47			   unsigned short reg, unsigned short *data, size_t len)
48{
49	struct i2c_client *client = to_i2c_client(chip->dev);
50	int i;
51	int error;
52
53	chip->xfer_buf[0] = cpu_to_be16(reg);
54
55	error = i2c_master_send(client, (u8 *)chip->xfer_buf,
56				sizeof(*chip->xfer_buf));
57	if (error >= 0)
58		error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
59					len * sizeof(*chip->xfer_buf));
60
61	if (unlikely(error < 0)) {
62		dev_err(&client->dev, "I2C read error: %d\n", error);
63		return error;
64	}
65
66	for (i = 0; i < len; i++)
67		data[i] = be16_to_cpu(chip->xfer_buf[i]);
68
69	return 0;
70}
71
72static int ad714x_i2c_probe(struct i2c_client *client,
73					const struct i2c_device_id *id)
74{
75	struct ad714x_chip *chip;
76
77	chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
78			    ad714x_i2c_read, ad714x_i2c_write);
79	if (IS_ERR(chip))
80		return PTR_ERR(chip);
81
82	i2c_set_clientdata(client, chip);
83
84	return 0;
85}
86
87static const struct i2c_device_id ad714x_id[] = {
88	{ "ad7142_captouch", 0 },
89	{ "ad7143_captouch", 0 },
90	{ "ad7147_captouch", 0 },
91	{ "ad7147a_captouch", 0 },
92	{ "ad7148_captouch", 0 },
93	{ }
94};
95MODULE_DEVICE_TABLE(i2c, ad714x_id);
96
97static struct i2c_driver ad714x_i2c_driver = {
98	.driver = {
99		.name = "ad714x_captouch",
100		.pm   = &ad714x_i2c_pm,
101	},
102	.probe    = ad714x_i2c_probe,
103	.id_table = ad714x_id,
104};
105
106module_i2c_driver(ad714x_i2c_driver);
107
108MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
109MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
110MODULE_LICENSE("GPL");
111