1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * TSC2004 touchscreen driver
4  *
5  * Copyright (C) 2015 QWERTY Embedded Design
6  * Copyright (C) 2015 EMAC Inc.
7  */
8 
9 #include <linux/module.h>
10 #include <linux/input.h>
11 #include <linux/of.h>
12 #include <linux/i2c.h>
13 #include <linux/regmap.h>
14 #include "tsc200x-core.h"
15 
16 static const struct input_id tsc2004_input_id = {
17 	.bustype = BUS_I2C,
18 	.product = 2004,
19 };
20 
21 static int tsc2004_cmd(struct device *dev, u8 cmd)
22 {
23 	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
24 	s32 data;
25 	struct i2c_client *i2c = to_i2c_client(dev);
26 
27 	data = i2c_smbus_write_byte(i2c, tx);
28 	if (data < 0) {
29 		dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
30 			__func__, cmd, data);
31 		return data;
32 	}
33 
34 	return 0;
35 }
36 
37 static int tsc2004_probe(struct i2c_client *i2c,
38 			 const struct i2c_device_id *id)
39 
40 {
41 	return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
42 			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
43 			     tsc2004_cmd);
44 }
45 
46 static int tsc2004_remove(struct i2c_client *i2c)
47 {
48 	tsc200x_remove(&i2c->dev);
49 
50 	return 0;
51 }
52 
53 static const struct i2c_device_id tsc2004_idtable[] = {
54 	{ "tsc2004", 0 },
55 	{ }
56 };
57 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
58 
59 #ifdef CONFIG_OF
60 static const struct of_device_id tsc2004_of_match[] = {
61 	{ .compatible = "ti,tsc2004" },
62 	{ /* sentinel */ }
63 };
64 MODULE_DEVICE_TABLE(of, tsc2004_of_match);
65 #endif
66 
67 static struct i2c_driver tsc2004_driver = {
68 	.driver = {
69 		.name   = "tsc2004",
70 		.of_match_table = of_match_ptr(tsc2004_of_match),
71 		.pm     = &tsc200x_pm_ops,
72 	},
73 	.id_table       = tsc2004_idtable,
74 	.probe          = tsc2004_probe,
75 	.remove         = tsc2004_remove,
76 };
77 module_i2c_driver(tsc2004_driver);
78 
79 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
80 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
81 MODULE_LICENSE("GPL");
82