LXR linux/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
  20static const struct regmap_config ad7879_i2c_regmap_config = {
  21        .reg_bits = 8,
  22        .val_bits = 16,
  23        .max_register = 15,
  24};
  25
  26static 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
  45static const struct i2c_device_id ad7879_id[] = {
  46        { "ad7879", 0 },
  47        { "ad7889", 0 },
  48        { }
  49};
  50MODULE_DEVICE_TABLE(i2c, ad7879_id);
  51
  52#ifdef CONFIG_OF
  53static const struct of_device_id ad7879_i2c_dt_ids[] = {
  54        { .compatible = "adi,ad7879-1", },
  55        { }
  56};
  57MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
  58#endif
  59
  60static 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
  70module_i2c_driver(ad7879_i2c_driver);
  71
  72MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
  73MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
  74MODULE_LICENSE("GPL");
  75