drivers/input/touchscreen/ad7879-i2c.c

   1 /*
   2  * AD7879-1/AD7889-1 touchscreen (I2C bus)
   3  *
   4  * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <linux/input.h>        /* BUS_I2C */
  10 #include <linux/i2c.h>
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/of.h>
  14 #include <linux/pm.h>
  15 #include <linux/regmap.h>
  16
  17 #include "ad7879.h"
  18
  19 #define AD7879_DEVID            0x79    /* AD7879-1/AD7889-1 */
  20
  21 static const struct regmap_config ad7879_i2c_regmap_config = {
  22         .reg_bits = 8,
  23         .val_bits = 16,
  24         .max_register = 15,
  25 };
  26
  27 static int ad7879_i2c_probe(struct i2c_client *client,
  28                                       const struct i2c_device_id *id)
  29 {
  30         struct regmap *regmap;
  31
  32         if (!i2c_check_functionality(client->adapter,
  33                                      I2C_FUNC_SMBUS_WORD_DATA)) {
  34                 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
  35                 return -EIO;
  36         }
  37
  38         regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
  39         if (IS_ERR(regmap))
  40                 return PTR_ERR(regmap);
  41
  42         return ad7879_probe(&client->dev, regmap, client->irq,
  43                             BUS_I2C, AD7879_DEVID);
  44 }
  45
  46 static const struct i2c_device_id ad7879_id[] = {
  47         { "ad7879", 0 },
  48         { "ad7889", 0 },
  49         { }
  50 };
  51 MODULE_DEVICE_TABLE(i2c, ad7879_id);
  52
  53 #ifdef CONFIG_OF
  54 static const struct of_device_id ad7879_i2c_dt_ids[] = {
  55         { .compatible = "adi,ad7879-1", },
  56         { }
  57 };
  58 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
  59 #endif
  60
  61 static struct i2c_driver ad7879_i2c_driver = {
  62         .driver = {
  63                 .name   = "ad7879",
  64                 .pm     = &ad7879_pm_ops,
  65                 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
  66         },
  67         .probe          = ad7879_i2c_probe,
  68         .id_table       = ad7879_id,
  69 };
  70
  71 module_i2c_driver(ad7879_i2c_driver);
  72
  73 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  74 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
  75 MODULE_LICENSE("GPL");