// SPDX-License-Identifier: GPL-2.0-only
/*
 * Murata ZPA2326 I2C pressure and temperature sensor driver
 *
 * Copyright (c) 2016 Parrot S.A.
 *
 * Author: Gregor Boirie <gregor.boirie@parrot.com>
 */

#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/i2c.h>
#include "zpa2326.h"

/*
 * read_flag_mask:
 *   - address bit 7 must be set to request a register read operation
 */
static const struct regmap_config zpa2326_regmap_i2c_config = {
        .reg_bits       = 8,
        .val_bits       = 8,
        .writeable_reg  = zpa2326_isreg_writeable,
        .readable_reg   = zpa2326_isreg_readable,
        .precious_reg   = zpa2326_isreg_precious,
        .max_register   = ZPA2326_TEMP_OUT_H_REG,
        .read_flag_mask = BIT(7),
};

static unsigned int zpa2326_i2c_hwid(const struct i2c_client *client)
{
#define ZPA2326_SA0(_addr)          (_addr & BIT(0))
#define ZPA2326_DEVICE_ID_SA0_SHIFT (1)

        /* Identification register bit 1 mirrors device address bit 0. */
        return (ZPA2326_DEVICE_ID |
                (ZPA2326_SA0(client->addr) << ZPA2326_DEVICE_ID_SA0_SHIFT));
}

static int zpa2326_probe_i2c(struct i2c_client          *client)
{
        const struct i2c_device_id *i2c_id = i2c_client_get_device_id(client);
        struct regmap *regmap;

        regmap = devm_regmap_init_i2c(client, &zpa2326_regmap_i2c_config);
        if (IS_ERR(regmap)) {
                dev_err(&client->dev, "failed to init registers map");
                return PTR_ERR(regmap);
        }

        return zpa2326_probe(&client->dev, i2c_id->name, client->irq,
                             zpa2326_i2c_hwid(client), regmap);
}

static void zpa2326_remove_i2c(struct i2c_client *client)
{
        zpa2326_remove(&client->dev);
}

static const struct i2c_device_id zpa2326_i2c_ids[] = {
        { .name = "zpa2326" },
        { }
};
MODULE_DEVICE_TABLE(i2c, zpa2326_i2c_ids);

static const struct of_device_id zpa2326_i2c_matches[] = {
        { .compatible = "murata,zpa2326" },
        { }
};
MODULE_DEVICE_TABLE(of, zpa2326_i2c_matches);

static struct i2c_driver zpa2326_i2c_driver = {
        .driver = {
                .name           = "zpa2326-i2c",
                .of_match_table = zpa2326_i2c_matches,
                .pm             = ZPA2326_PM_OPS,
        },
        .probe = zpa2326_probe_i2c,
        .remove   = zpa2326_remove_i2c,
        .id_table = zpa2326_i2c_ids,
};
module_i2c_driver(zpa2326_i2c_driver);

MODULE_AUTHOR("Gregor Boirie <gregor.boirie@parrot.com>");
MODULE_DESCRIPTION("I2C driver for Murata ZPA2326 pressure sensor");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS("IIO_ZPA2326");