1 /*
2  * TSC2004 touchscreen driver
3  *
4  * Copyright (C) 2015 QWERTY Embedded Design
5  * Copyright (C) 2015 EMAC Inc.
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  */
17 
18 #include <linux/module.h>
19 #include <linux/input.h>
20 #include <linux/of.h>
21 #include <linux/i2c.h>
22 #include <linux/regmap.h>
23 #include "tsc200x-core.h"
24 
25 static const struct input_id tsc2004_input_id = {
26 	.bustype = BUS_I2C,
27 	.product = 2004,
28 };
29 
30 static int tsc2004_cmd(struct device *dev, u8 cmd)
31 {
32 	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
33 	s32 data;
34 	struct i2c_client *i2c = to_i2c_client(dev);
35 
36 	data = i2c_smbus_write_byte(i2c, tx);
37 	if (data < 0) {
38 		dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
39 			__func__, cmd, data);
40 		return data;
41 	}
42 
43 	return 0;
44 }
45 
46 static int tsc2004_probe(struct i2c_client *i2c,
47 			 const struct i2c_device_id *id)
48 
49 {
50 	return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
51 			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
52 			     tsc2004_cmd);
53 }
54 
55 static int tsc2004_remove(struct i2c_client *i2c)
56 {
57 	return tsc200x_remove(&i2c->dev);
58 }
59 
60 static const struct i2c_device_id tsc2004_idtable[] = {
61 	{ "tsc2004", 0 },
62 	{ }
63 };
64 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
65 
66 #ifdef CONFIG_OF
67 static const struct of_device_id tsc2004_of_match[] = {
68 	{ .compatible = "ti,tsc2004" },
69 	{ /* sentinel */ }
70 };
71 MODULE_DEVICE_TABLE(of, tsc2004_of_match);
72 #endif
73 
74 static struct i2c_driver tsc2004_driver = {
75 	.driver = {
76 		.name   = "tsc2004",
77 		.of_match_table = of_match_ptr(tsc2004_of_match),
78 		.pm     = &tsc200x_pm_ops,
79 	},
80 	.id_table       = tsc2004_idtable,
81 	.probe          = tsc2004_probe,
82 	.remove         = tsc2004_remove,
83 };
84 module_i2c_driver(tsc2004_driver);
85 
86 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
87 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
88 MODULE_LICENSE("GPL");
89