LXR linux/drivers/input/touchscreen/tsc2005.c

   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
  28static const struct input_id tsc2005_input_id = {
  29        .bustype = BUS_SPI,
  30        .product = 2005,
  31};
  32
  33static 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
  58static 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
  76static int tsc2005_remove(struct spi_device *spi)
  77{
  78        return tsc200x_remove(&spi->dev);
  79}
  80
  81#ifdef CONFIG_OF
  82static const struct of_device_id tsc2005_of_match[] = {
  83        { .compatible = "ti,tsc2005" },
  84        { /* sentinel */ }
  85};
  86MODULE_DEVICE_TABLE(of, tsc2005_of_match);
  87#endif
  88
  89static 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};
  98module_spi_driver(tsc2005_driver);
  99
 100MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
 101MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
 102MODULE_LICENSE("GPL");
 103MODULE_ALIAS("spi:tsc2005");
 104