1 /*
2  * TSC2005 touchscreen driver
3  *
4  * Copyright (C) 2006-2010 Nokia Corporation
5  * Copyright (C) 2015 QWERTY Embedded Design
6  * Copyright (C) 2015 EMAC Inc.
7  *
8  * Based on original tsc2005.c by Lauri Leukkunen <lauri.leukkunen@nokia.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  */
20 
21 #include <linux/input.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/spi/spi.h>
25 #include <linux/regmap.h>
26 #include "tsc200x-core.h"
27 
28 static const struct input_id tsc2005_input_id = {
29 	.bustype = BUS_SPI,
30 	.product = 2005,
31 };
32 
33 static int tsc2005_cmd(struct device *dev, u8 cmd)
34 {
35 	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
36 	struct spi_transfer xfer = {
37 		.tx_buf         = &tx,
38 		.len            = 1,
39 		.bits_per_word  = 8,
40 	};
41 	struct spi_message msg;
42 	struct spi_device *spi = to_spi_device(dev);
43 	int error;
44 
45 	spi_message_init(&msg);
46 	spi_message_add_tail(&xfer, &msg);
47 
48 	error = spi_sync(spi, &msg);
49 	if (error) {
50 		dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
51 			__func__, cmd, error);
52 		return error;
53 	}
54 
55 	return 0;
56 }
57 
58 static int tsc2005_probe(struct spi_device *spi)
59 {
60 	int error;
61 
62 	spi->mode = SPI_MODE_0;
63 	spi->bits_per_word = 8;
64 	if (!spi->max_speed_hz)
65 		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
66 
67 	error = spi_setup(spi);
68 	if (error)
69 		return error;
70 
71 	return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
72 			     devm_regmap_init_spi(spi, &tsc200x_regmap_config),
73 			     tsc2005_cmd);
74 }
75 
76 static int tsc2005_remove(struct spi_device *spi)
77 {
78 	return tsc200x_remove(&spi->dev);
79 }
80 
81 #ifdef CONFIG_OF
82 static const struct of_device_id tsc2005_of_match[] = {
83 	{ .compatible = "ti,tsc2005" },
84 	{ /* sentinel */ }
85 };
86 MODULE_DEVICE_TABLE(of, tsc2005_of_match);
87 #endif
88 
89 static struct spi_driver tsc2005_driver = {
90 	.driver	= {
91 		.name	= "tsc2005",
92 		.of_match_table = of_match_ptr(tsc2005_of_match),
93 		.pm	= &tsc200x_pm_ops,
94 	},
95 	.probe	= tsc2005_probe,
96 	.remove	= tsc2005_remove,
97 };
98 module_spi_driver(tsc2005_driver);
99 
100 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
101 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
102 MODULE_LICENSE("GPL");
103 MODULE_ALIAS("spi:tsc2005");
104