// SPDX-License-Identifier: GPL-2.0-only
/*
 * sky81452.c   SKY81452 MFD driver
 *
 * Copyright 2014 Skyworks Solutions Inc.
 * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/sky81452.h>

static const struct regmap_config sky81452_config = {
        .reg_bits = 8,
        .val_bits = 8,
};

static int sky81452_probe(struct i2c_client *client)
{
        struct device *dev = &client->dev;
        const struct sky81452_platform_data *pdata = dev_get_platdata(dev);
        struct mfd_cell cells[2];
        struct regmap *regmap;
        int ret;

        if (!pdata) {
                pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
                if (!pdata)
                        return -ENOMEM;
        }

        regmap = devm_regmap_init_i2c(client, &sky81452_config);
        if (IS_ERR(regmap)) {
                dev_err(dev, "failed to initialize.err=%ld\n", PTR_ERR(regmap));
                return PTR_ERR(regmap);
        }

        i2c_set_clientdata(client, regmap);

        memset(cells, 0, sizeof(cells));
        cells[0].name = "sky81452-backlight";
        cells[0].of_compatible = "skyworks,sky81452-backlight";
        cells[1].name = "sky81452-regulator";
        cells[1].platform_data = pdata->regulator_init_data;
        cells[1].pdata_size = sizeof(*pdata->regulator_init_data);

        ret = devm_mfd_add_devices(dev, -1, cells, ARRAY_SIZE(cells),
                                   NULL, 0, NULL);
        if (ret)
                dev_err(dev, "failed to add child devices. err=%d\n", ret);

        return ret;
}

static const struct i2c_device_id sky81452_ids[] = {
        { "sky81452" },
        { }
};
MODULE_DEVICE_TABLE(i2c, sky81452_ids);

#ifdef CONFIG_OF
static const struct of_device_id sky81452_of_match[] = {
        { .compatible = "skyworks,sky81452", },
        { }
};
MODULE_DEVICE_TABLE(of, sky81452_of_match);
#endif

static struct i2c_driver sky81452_driver = {
        .driver = {
                .name = "sky81452",
                .of_match_table = of_match_ptr(sky81452_of_match),
        },
        .probe = sky81452_probe,
        .id_table = sky81452_ids,
};

module_i2c_driver(sky81452_driver);

MODULE_DESCRIPTION("Skyworks SKY81452 MFD driver");
MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
MODULE_LICENSE("GPL v2");