1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * AD714X CapTouch Programmable Controller driver (I2C bus)
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2009-2011 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/pm.h>
13*4882a593Smuzhiyun #include "ad714x.h"
14*4882a593Smuzhiyun
ad714x_i2c_suspend(struct device * dev)15*4882a593Smuzhiyun static int __maybe_unused ad714x_i2c_suspend(struct device *dev)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun return ad714x_disable(i2c_get_clientdata(to_i2c_client(dev)));
18*4882a593Smuzhiyun }
19*4882a593Smuzhiyun
ad714x_i2c_resume(struct device * dev)20*4882a593Smuzhiyun static int __maybe_unused ad714x_i2c_resume(struct device *dev)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun return ad714x_enable(i2c_get_clientdata(to_i2c_client(dev)));
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun static SIMPLE_DEV_PM_OPS(ad714x_i2c_pm, ad714x_i2c_suspend, ad714x_i2c_resume);
26*4882a593Smuzhiyun
ad714x_i2c_write(struct ad714x_chip * chip,unsigned short reg,unsigned short data)27*4882a593Smuzhiyun static int ad714x_i2c_write(struct ad714x_chip *chip,
28*4882a593Smuzhiyun unsigned short reg, unsigned short data)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct i2c_client *client = to_i2c_client(chip->dev);
31*4882a593Smuzhiyun int error;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun chip->xfer_buf[0] = cpu_to_be16(reg);
34*4882a593Smuzhiyun chip->xfer_buf[1] = cpu_to_be16(data);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun error = i2c_master_send(client, (u8 *)chip->xfer_buf,
37*4882a593Smuzhiyun 2 * sizeof(*chip->xfer_buf));
38*4882a593Smuzhiyun if (unlikely(error < 0)) {
39*4882a593Smuzhiyun dev_err(&client->dev, "I2C write error: %d\n", error);
40*4882a593Smuzhiyun return error;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun return 0;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
ad714x_i2c_read(struct ad714x_chip * chip,unsigned short reg,unsigned short * data,size_t len)46*4882a593Smuzhiyun static int ad714x_i2c_read(struct ad714x_chip *chip,
47*4882a593Smuzhiyun unsigned short reg, unsigned short *data, size_t len)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun struct i2c_client *client = to_i2c_client(chip->dev);
50*4882a593Smuzhiyun int i;
51*4882a593Smuzhiyun int error;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun chip->xfer_buf[0] = cpu_to_be16(reg);
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun error = i2c_master_send(client, (u8 *)chip->xfer_buf,
56*4882a593Smuzhiyun sizeof(*chip->xfer_buf));
57*4882a593Smuzhiyun if (error >= 0)
58*4882a593Smuzhiyun error = i2c_master_recv(client, (u8 *)chip->xfer_buf,
59*4882a593Smuzhiyun len * sizeof(*chip->xfer_buf));
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun if (unlikely(error < 0)) {
62*4882a593Smuzhiyun dev_err(&client->dev, "I2C read error: %d\n", error);
63*4882a593Smuzhiyun return error;
64*4882a593Smuzhiyun }
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun for (i = 0; i < len; i++)
67*4882a593Smuzhiyun data[i] = be16_to_cpu(chip->xfer_buf[i]);
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun return 0;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
ad714x_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)72*4882a593Smuzhiyun static int ad714x_i2c_probe(struct i2c_client *client,
73*4882a593Smuzhiyun const struct i2c_device_id *id)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun struct ad714x_chip *chip;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
78*4882a593Smuzhiyun ad714x_i2c_read, ad714x_i2c_write);
79*4882a593Smuzhiyun if (IS_ERR(chip))
80*4882a593Smuzhiyun return PTR_ERR(chip);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun i2c_set_clientdata(client, chip);
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun return 0;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun static const struct i2c_device_id ad714x_id[] = {
88*4882a593Smuzhiyun { "ad7142_captouch", 0 },
89*4882a593Smuzhiyun { "ad7143_captouch", 0 },
90*4882a593Smuzhiyun { "ad7147_captouch", 0 },
91*4882a593Smuzhiyun { "ad7147a_captouch", 0 },
92*4882a593Smuzhiyun { "ad7148_captouch", 0 },
93*4882a593Smuzhiyun { }
94*4882a593Smuzhiyun };
95*4882a593Smuzhiyun MODULE_DEVICE_TABLE(i2c, ad714x_id);
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun static struct i2c_driver ad714x_i2c_driver = {
98*4882a593Smuzhiyun .driver = {
99*4882a593Smuzhiyun .name = "ad714x_captouch",
100*4882a593Smuzhiyun .pm = &ad714x_i2c_pm,
101*4882a593Smuzhiyun },
102*4882a593Smuzhiyun .probe = ad714x_i2c_probe,
103*4882a593Smuzhiyun .id_table = ad714x_id,
104*4882a593Smuzhiyun };
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun module_i2c_driver(ad714x_i2c_driver);
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
109*4882a593Smuzhiyun MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
110*4882a593Smuzhiyun MODULE_LICENSE("GPL");
111