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 int tsc2004_cmd(struct device *dev, u8 cmd)
26 {
27 	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
28 	s32 data;
29 	struct i2c_client *i2c = to_i2c_client(dev);
30 
31 	data = i2c_smbus_write_byte(i2c, tx);
32 	if (data < 0) {
33 		dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
34 			__func__, cmd, data);
35 		return data;
36 	}
37 
38 	return 0;
39 }
40 
41 static int tsc2004_probe(struct i2c_client *i2c,
42 			 const struct i2c_device_id *id)
43 
44 {
45 	return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
46 			     devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
47 			     tsc2004_cmd);
48 }
49 
50 static int tsc2004_remove(struct i2c_client *i2c)
51 {
52 	return tsc200x_remove(&i2c->dev);
53 }
54 
55 static const struct i2c_device_id tsc2004_idtable[] = {
56 	{ "tsc2004", 0 },
57 	{ }
58 };
59 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
60 
61 #ifdef CONFIG_OF
62 static const struct of_device_id tsc2004_of_match[] = {
63 	{ .compatible = "ti,tsc2004" },
64 	{ /* sentinel */ }
65 };
66 MODULE_DEVICE_TABLE(of, tsc2004_of_match);
67 #endif
68 
69 static struct i2c_driver tsc2004_driver = {
70 	.driver = {
71 		.name   = "tsc2004",
72 		.of_match_table = of_match_ptr(tsc2004_of_match),
73 		.pm     = &tsc200x_pm_ops,
74 	},
75 	.id_table       = tsc2004_idtable,
76 	.probe          = tsc2004_probe,
77 	.remove         = tsc2004_remove,
78 };
79 module_i2c_driver(tsc2004_driver);
80 
81 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
82 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
83 MODULE_LICENSE("GPL");
84