1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * TSC2005 touchscreen driver
4 *
5 * Copyright (C) 2006-2010 Nokia Corporation
6 * Copyright (C) 2015 QWERTY Embedded Design
7 * Copyright (C) 2015 EMAC Inc.
8 *
9 * Based on original tsc2005.c by Lauri Leukkunen <lauri.leukkunen@nokia.com>
10 */
11
12 #include <linux/input.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/spi/spi.h>
16 #include <linux/regmap.h>
17 #include "tsc200x-core.h"
18
19 static const struct input_id tsc2005_input_id = {
20 .bustype = BUS_SPI,
21 .product = 2005,
22 };
23
tsc2005_cmd(struct device * dev,u8 cmd)24 static int tsc2005_cmd(struct device *dev, u8 cmd)
25 {
26 u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
27 struct spi_transfer xfer = {
28 .tx_buf = &tx,
29 .len = 1,
30 .bits_per_word = 8,
31 };
32 struct spi_message msg;
33 struct spi_device *spi = to_spi_device(dev);
34 int error;
35
36 spi_message_init(&msg);
37 spi_message_add_tail(&xfer, &msg);
38
39 error = spi_sync(spi, &msg);
40 if (error) {
41 dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
42 __func__, cmd, error);
43 return error;
44 }
45
46 return 0;
47 }
48
tsc2005_probe(struct spi_device * spi)49 static int tsc2005_probe(struct spi_device *spi)
50 {
51 int error;
52
53 spi->mode = SPI_MODE_0;
54 spi->bits_per_word = 8;
55 if (!spi->max_speed_hz)
56 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
57
58 error = spi_setup(spi);
59 if (error)
60 return error;
61
62 return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
63 devm_regmap_init_spi(spi, &tsc200x_regmap_config),
64 tsc2005_cmd);
65 }
66
tsc2005_remove(struct spi_device * spi)67 static void tsc2005_remove(struct spi_device *spi)
68 {
69 tsc200x_remove(&spi->dev);
70 }
71
72 #ifdef CONFIG_OF
73 static const struct of_device_id tsc2005_of_match[] = {
74 { .compatible = "ti,tsc2005" },
75 { /* sentinel */ }
76 };
77 MODULE_DEVICE_TABLE(of, tsc2005_of_match);
78 #endif
79
80 static struct spi_driver tsc2005_driver = {
81 .driver = {
82 .name = "tsc2005",
83 .of_match_table = of_match_ptr(tsc2005_of_match),
84 .pm = pm_sleep_ptr(&tsc200x_pm_ops),
85 },
86 .probe = tsc2005_probe,
87 .remove = tsc2005_remove,
88 };
89 module_spi_driver(tsc2005_driver);
90
91 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
92 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
93 MODULE_LICENSE("GPL");
94 MODULE_ALIAS("spi:tsc2005");
95