LXR linux/drivers/input/touchscreen/tsc2004.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * TSC2004 touchscreen driver
   4 *
   5 * Copyright (C) 2015 QWERTY Embedded Design
   6 * Copyright (C) 2015 EMAC Inc.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/input.h>
  11#include <linux/of.h>
  12#include <linux/i2c.h>
  13#include <linux/regmap.h>
  14#include "tsc200x-core.h"
  15
  16static const struct input_id tsc2004_input_id = {
  17        .bustype = BUS_I2C,
  18        .product = 2004,
  19};
  20
  21static int tsc2004_cmd(struct device *dev, u8 cmd)
  22{
  23        u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  24        s32 data;
  25        struct i2c_client *i2c = to_i2c_client(dev);
  26
  27        data = i2c_smbus_write_byte(i2c, tx);
  28        if (data < 0) {
  29                dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
  30                        __func__, cmd, data);
  31                return data;
  32        }
  33
  34        return 0;
  35}
  36
  37static int tsc2004_probe(struct i2c_client *i2c,
  38                         const struct i2c_device_id *id)
  39
  40{
  41        return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
  42                             devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
  43                             tsc2004_cmd);
  44}
  45
  46static int tsc2004_remove(struct i2c_client *i2c)
  47{
  48        return tsc200x_remove(&i2c->dev);
  49}
  50
  51static const struct i2c_device_id tsc2004_idtable[] = {
  52        { "tsc2004", 0 },
  53        { }
  54};
  55MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
  56
  57#ifdef CONFIG_OF
  58static const struct of_device_id tsc2004_of_match[] = {
  59        { .compatible = "ti,tsc2004" },
  60        { /* sentinel */ }
  61};
  62MODULE_DEVICE_TABLE(of, tsc2004_of_match);
  63#endif
  64
  65static struct i2c_driver tsc2004_driver = {
  66        .driver = {
  67                .name   = "tsc2004",
  68                .of_match_table = of_match_ptr(tsc2004_of_match),
  69                .pm     = &tsc200x_pm_ops,
  70        },
  71        .id_table       = tsc2004_idtable,
  72        .probe          = tsc2004_probe,
  73        .remove         = tsc2004_remove,
  74};
  75module_i2c_driver(tsc2004_driver);
  76
  77MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  78MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
  79MODULE_LICENSE("GPL");
  80