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

   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
  19static const struct input_id tsc2005_input_id = {
  20        .bustype = BUS_SPI,
  21        .product = 2005,
  22};
  23
  24static 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
  49static 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
  67static int tsc2005_remove(struct spi_device *spi)
  68{
  69        return tsc200x_remove(&spi->dev);
  70}
  71
  72#ifdef CONFIG_OF
  73static const struct of_device_id tsc2005_of_match[] = {
  74        { .compatible = "ti,tsc2005" },
  75        { /* sentinel */ }
  76};
  77MODULE_DEVICE_TABLE(of, tsc2005_of_match);
  78#endif
  79
  80static struct spi_driver tsc2005_driver = {
  81        .driver = {
  82                .name   = "tsc2005",
  83                .of_match_table = of_match_ptr(tsc2005_of_match),
  84                .pm     = &tsc200x_pm_ops,
  85        },
  86        .probe  = tsc2005_probe,
  87        .remove = tsc2005_remove,
  88};
  89module_spi_driver(tsc2005_driver);
  90
  91MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  92MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
  93MODULE_LICENSE("GPL");
  94MODULE_ALIAS("spi:tsc2005");
  95