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/module.h>
22 #include <linux/input.h>
23 #include <linux/spi/spi.h>
24 #include <linux/regmap.h>
25 #include "tsc200x-core.h"
26 
27 static int tsc2005_cmd(struct device *dev, u8 cmd)
28 {
29 	u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
30 	struct spi_transfer xfer = {
31 		.tx_buf         = &tx,
32 		.len            = 1,
33 		.bits_per_word  = 8,
34 	};
35 	struct spi_message msg;
36 	struct spi_device *spi = to_spi_device(dev);
37 	int error;
38 
39 	spi_message_init(&msg);
40 	spi_message_add_tail(&xfer, &msg);
41 
42 	error = spi_sync(spi, &msg);
43 	if (error) {
44 		dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
45 			__func__, cmd, error);
46 		return error;
47 	}
48 
49 	return 0;
50 }
51 
52 static int tsc2005_probe(struct spi_device *spi)
53 {
54 	int error;
55 
56 	spi->mode = SPI_MODE_0;
57 	spi->bits_per_word = 8;
58 	if (!spi->max_speed_hz)
59 		spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
60 
61 	error = spi_setup(spi);
62 	if (error)
63 		return error;
64 
65 	return tsc200x_probe(&spi->dev, spi->irq, BUS_SPI,
66 			     devm_regmap_init_spi(spi, &tsc200x_regmap_config),
67 			     tsc2005_cmd);
68 }
69 
70 static int tsc2005_remove(struct spi_device *spi)
71 {
72 	return tsc200x_remove(&spi->dev);
73 }
74 
75 static struct spi_driver tsc2005_driver = {
76 	.driver	= {
77 		.name	= "tsc2005",
78 		.pm	= &tsc200x_pm_ops,
79 	},
80 	.probe	= tsc2005_probe,
81 	.remove	= tsc2005_remove,
82 };
83 module_spi_driver(tsc2005_driver);
84 
85 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
86 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
87 MODULE_LICENSE("GPL");
88 MODULE_ALIAS("spi:tsc2005");
89