LXR linux/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
  21static const struct regmap_config ad7879_i2c_regmap_config = {
  22        .reg_bits = 8,
  23        .val_bits = 16,
  24        .max_register = 15,
  25};
  26
  27static 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
  46static const struct i2c_device_id ad7879_id[] = {
  47        { "ad7879", 0 },
  48        { "ad7889", 0 },
  49        { }
  50};
  51MODULE_DEVICE_TABLE(i2c, ad7879_id);
  52
  53#ifdef CONFIG_OF
  54static const struct of_device_id ad7879_i2c_dt_ids[] = {
  55        { .compatible = "adi,ad7879-1", },
  56        { }
  57};
  58MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
  59#endif
  60
  61static 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
  71module_i2c_driver(ad7879_i2c_driver);
  72
  73MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  74MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
  75MODULE_LICENSE("GPL");
  76