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

   1/*
   2 * TSC2004 touchscreen driver
   3 *
   4 * Copyright (C) 2015 QWERTY Embedded Design
   5 * Copyright (C) 2015 EMAC Inc.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation; either version 2 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 * GNU General Public License for more details.
  16 */
  17
  18#include <linux/module.h>
  19#include <linux/input.h>
  20#include <linux/of.h>
  21#include <linux/i2c.h>
  22#include <linux/regmap.h>
  23#include "tsc200x-core.h"
  24
  25static const struct input_id tsc2004_input_id = {
  26        .bustype = BUS_I2C,
  27        .product = 2004,
  28};
  29
  30static int tsc2004_cmd(struct device *dev, u8 cmd)
  31{
  32        u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  33        s32 data;
  34        struct i2c_client *i2c = to_i2c_client(dev);
  35
  36        data = i2c_smbus_write_byte(i2c, tx);
  37        if (data < 0) {
  38                dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
  39                        __func__, cmd, data);
  40                return data;
  41        }
  42
  43        return 0;
  44}
  45
  46static int tsc2004_probe(struct i2c_client *i2c,
  47                         const struct i2c_device_id *id)
  48
  49{
  50        return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
  51                             devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
  52                             tsc2004_cmd);
  53}
  54
  55static int tsc2004_remove(struct i2c_client *i2c)
  56{
  57        return tsc200x_remove(&i2c->dev);
  58}
  59
  60static const struct i2c_device_id tsc2004_idtable[] = {
  61        { "tsc2004", 0 },
  62        { }
  63};
  64MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
  65
  66#ifdef CONFIG_OF
  67static const struct of_device_id tsc2004_of_match[] = {
  68        { .compatible = "ti,tsc2004" },
  69        { /* sentinel */ }
  70};
  71MODULE_DEVICE_TABLE(of, tsc2004_of_match);
  72#endif
  73
  74static struct i2c_driver tsc2004_driver = {
  75        .driver = {
  76                .name   = "tsc2004",
  77                .of_match_table = of_match_ptr(tsc2004_of_match),
  78                .pm     = &tsc200x_pm_ops,
  79        },
  80        .id_table       = tsc2004_idtable,
  81        .probe          = tsc2004_probe,
  82        .remove         = tsc2004_remove,
  83};
  84module_i2c_driver(tsc2004_driver);
  85
  86MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  87MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
  88MODULE_LICENSE("GPL");
  89