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
  25 static int tsc2004_cmd(struct device *dev, u8 cmd)
  26 {
  27         u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
  28         s32 data;
  29         struct i2c_client *i2c = to_i2c_client(dev);
  30
  31         data = i2c_smbus_write_byte(i2c, tx);
  32         if (data < 0) {
  33                 dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
  34                         __func__, cmd, data);
  35                 return data;
  36         }
  37
  38         return 0;
  39 }
  40
  41 static int tsc2004_probe(struct i2c_client *i2c,
  42                          const struct i2c_device_id *id)
  43
  44 {
  45         return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
  46                              devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
  47                              tsc2004_cmd);
  48 }
  49
  50 static int tsc2004_remove(struct i2c_client *i2c)
  51 {
  52         return tsc200x_remove(&i2c->dev);
  53 }
  54
  55 static const struct i2c_device_id tsc2004_idtable[] = {
  56         { "tsc2004", 0 },
  57         { }
  58 };
  59 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
  60
  61 #ifdef CONFIG_OF
  62 static const struct of_device_id tsc2004_of_match[] = {
  63         { .compatible = "ti,tsc2004" },
  64         { /* sentinel */ }
  65 };
  66 MODULE_DEVICE_TABLE(of, tsc2004_of_match);
  67 #endif
  68
  69 static struct i2c_driver tsc2004_driver = {
  70         .driver = {
  71                 .name   = "tsc2004",
  72                 .of_match_table = of_match_ptr(tsc2004_of_match),
  73                 .pm     = &tsc200x_pm_ops,
  74         },
  75         .id_table       = tsc2004_idtable,
  76         .probe          = tsc2004_probe,
  77         .remove         = tsc2004_remove,
  78 };
  79 module_i2c_driver(tsc2004_driver);
  80
  81 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  82 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
  83 MODULE_LICENSE("GPL");