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/module.h>
  22#include <linux/input.h>
  23#include <linux/spi/spi.h>
  24#include <linux/regmap.h>
  25#include "tsc200x-core.h"
  26
  27static const struct input_id tsc2005_input_id = {
  28        .bustype = BUS_SPI,
  29        .product = 2005,
  30};
  31
  32static int tsc2005_cmd(struct device *dev, u8 cmd)
  33{
  34        u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  35        struct spi_transfer xfer = {
  36                .tx_buf         = &tx,
  37                .len            = 1,
  38                .bits_per_word  = 8,
  39        };
  40        struct spi_message msg;
  41        struct spi_device *spi = to_spi_device(dev);
  42        int error;
  43
  44        spi_message_init(&msg);
  45        spi_message_add_tail(&xfer, &msg);
  46
  47        error = spi_sync(spi, &msg);
  48        if (error) {
  49                dev_err(dev, "%s: failed, command: %x, spi error: %d\n",
  50                        __func__, cmd, error);
  51                return error;
  52        }
  53
  54        return 0;
  55}
  56
  57static int tsc2005_probe(struct spi_device *spi)
  58{
  59        int error;
  60
  61        spi->mode = SPI_MODE_0;
  62        spi->bits_per_word = 8;
  63        if (!spi->max_speed_hz)
  64                spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
  65
  66        error = spi_setup(spi);
  67        if (error)
  68                return error;
  69
  70        return tsc200x_probe(&spi->dev, spi->irq, &tsc2005_input_id,
  71                             devm_regmap_init_spi(spi, &tsc200x_regmap_config),
  72                             tsc2005_cmd);
  73}
  74
  75static int tsc2005_remove(struct spi_device *spi)
  76{
  77        return tsc200x_remove(&spi->dev);
  78}
  79
  80static struct spi_driver tsc2005_driver = {
  81        .driver = {
  82                .name   = "tsc2005",
  83                .pm     = &tsc200x_pm_ops,
  84        },
  85        .probe  = tsc2005_probe,
  86        .remove = tsc2005_remove,
  87};
  88module_spi_driver(tsc2005_driver);
  89
  90MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  91MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
  92MODULE_LICENSE("GPL");
  93MODULE_ALIAS("spi:tsc2005");
  94