drivers/input/touchscreen/ad7879-i2c.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AD7879-1/AD7889-1 touchscreen (I2C bus)
   4  *
   5  * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
   6  */
   7
   8 #include <linux/input.h>        /* BUS_I2C */
   9 #include <linux/i2c.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/of.h>
  13 #include <linux/pm.h>
  14 #include <linux/regmap.h>
  15
  16 #include "ad7879.h"
  17
  18 #define AD7879_DEVID            0x79    /* AD7879-1/AD7889-1 */
  19
  20 static const struct regmap_config ad7879_i2c_regmap_config = {
  21         .reg_bits = 8,
  22         .val_bits = 16,
  23         .max_register = 15,
  24 };
  25
  26 static int ad7879_i2c_probe(struct i2c_client *client,
  27                                       const struct i2c_device_id *id)
  28 {
  29         struct regmap *regmap;
  30
  31         if (!i2c_check_functionality(client->adapter,
  32                                      I2C_FUNC_SMBUS_WORD_DATA)) {
  33                 dev_err(&client->dev, "SMBUS Word Data not Supported\n");
  34                 return -EIO;
  35         }
  36
  37         regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
  38         if (IS_ERR(regmap))
  39                 return PTR_ERR(regmap);
  40
  41         return ad7879_probe(&client->dev, regmap, client->irq,
  42                             BUS_I2C, AD7879_DEVID);
  43 }
  44
  45 static const struct i2c_device_id ad7879_id[] = {
  46         { "ad7879", 0 },
  47         { "ad7889", 0 },
  48         { }
  49 };
  50 MODULE_DEVICE_TABLE(i2c, ad7879_id);
  51
  52 #ifdef CONFIG_OF
  53 static const struct of_device_id ad7879_i2c_dt_ids[] = {
  54         { .compatible = "adi,ad7879-1", },
  55         { }
  56 };
  57 MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
  58 #endif
  59
  60 static struct i2c_driver ad7879_i2c_driver = {
  61         .driver = {
  62                 .name   = "ad7879",
  63                 .pm     = &ad7879_pm_ops,
  64                 .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
  65         },
  66         .probe          = ad7879_i2c_probe,
  67         .id_table       = ad7879_id,
  68 };
  69
  70 module_i2c_driver(ad7879_i2c_driver);
  71
  72 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  73 MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
  74 MODULE_LICENSE("GPL");