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
  16 static const struct input_id tsc2004_input_id = {
  17         .bustype = BUS_I2C,
  18         .product = 2004,
  19 };
  20
  21 static 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
  37 static int tsc2004_probe(struct i2c_client *i2c)
  38
  39 {
  40         return tsc200x_probe(&i2c->dev, i2c->irq, &tsc2004_input_id,
  41                              devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
  42                              tsc2004_cmd);
  43 }
  44
  45 static const struct i2c_device_id tsc2004_idtable[] = {
  46         { "tsc2004" },
  47         { }
  48 };
  49 MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
  50
  51 #ifdef CONFIG_OF
  52 static const struct of_device_id tsc2004_of_match[] = {
  53         { .compatible = "ti,tsc2004" },
  54         { /* sentinel */ }
  55 };
  56 MODULE_DEVICE_TABLE(of, tsc2004_of_match);
  57 #endif
  58
  59 static struct i2c_driver tsc2004_driver = {
  60         .driver = {
  61                 .name           = "tsc2004",
  62                 .dev_groups     = tsc200x_groups,
  63                 .of_match_table = of_match_ptr(tsc2004_of_match),
  64                 .pm             = pm_sleep_ptr(&tsc200x_pm_ops),
  65         },
  66         .id_table       = tsc2004_idtable,
  67         .probe          = tsc2004_probe,
  68 };
  69 module_i2c_driver(tsc2004_driver);
  70
  71 MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
  72 MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
  73 MODULE_LICENSE("GPL");