// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AD7879-1/AD7889-1 touchscreen (I2C bus)
 *
 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 */

#include <linux/input.h>        /* BUS_I2C */
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/pm.h>
#include <linux/regmap.h>

#include "ad7879.h"

#define AD7879_DEVID            0x79    /* AD7879-1/AD7889-1 */

static const struct regmap_config ad7879_i2c_regmap_config = {
        .reg_bits = 8,
        .val_bits = 16,
        .max_register = 15,
};

static int ad7879_i2c_probe(struct i2c_client *client)
{
        struct regmap *regmap;

        if (!i2c_check_functionality(client->adapter,
                                     I2C_FUNC_SMBUS_WORD_DATA)) {
                dev_err(&client->dev, "SMBUS Word Data not Supported\n");
                return -EIO;
        }

        regmap = devm_regmap_init_i2c(client, &ad7879_i2c_regmap_config);
        if (IS_ERR(regmap))
                return PTR_ERR(regmap);

        return ad7879_probe(&client->dev, regmap, client->irq,
                            BUS_I2C, AD7879_DEVID);
}

static const struct i2c_device_id ad7879_id[] = {
        { .name = "ad7879" },
        { .name = "ad7889" },
        { }
};
MODULE_DEVICE_TABLE(i2c, ad7879_id);

#ifdef CONFIG_OF
static const struct of_device_id ad7879_i2c_dt_ids[] = {
        { .compatible = "adi,ad7879-1", },
        { }
};
MODULE_DEVICE_TABLE(of, ad7879_i2c_dt_ids);
#endif

static struct i2c_driver ad7879_i2c_driver = {
        .driver = {
                .name           = "ad7879",
                .dev_groups     = ad7879_groups,
                .pm             = &ad7879_pm_ops,
                .of_match_table = of_match_ptr(ad7879_i2c_dt_ids),
        },
        .probe          = ad7879_i2c_probe,
        .id_table       = ad7879_id,
};

module_i2c_driver(ad7879_i2c_driver);

MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
MODULE_LICENSE("GPL");