// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of.h>

#include "lan9303.h"

struct lan9303_i2c {
        struct i2c_client *device;
        struct lan9303 chip;
};

static const struct regmap_config lan9303_i2c_regmap_config = {
        .reg_bits = 8,
        .val_bits = 32,
        .reg_stride = 1,
        .can_multi_write = true,
        .max_register = 0x0ff, /* address bits 0..1 are not used */
        .reg_format_endian = REGMAP_ENDIAN_LITTLE,

        .volatile_table = &lan9303_register_set,
        .wr_table = &lan9303_register_set,
        .rd_table = &lan9303_register_set,

        .cache_type = REGCACHE_NONE,
};

static int lan9303_i2c_probe(struct i2c_client *client)
{
        struct lan9303_i2c *sw_dev;
        int ret;

        sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
                              GFP_KERNEL);
        if (!sw_dev)
                return -ENOMEM;

        sw_dev->chip.regmap = devm_regmap_init_i2c(client,
                                                   &lan9303_i2c_regmap_config);
        if (IS_ERR(sw_dev->chip.regmap)) {
                ret = PTR_ERR(sw_dev->chip.regmap);
                dev_err(&client->dev, "Failed to allocate register map: %d\n",
                        ret);
                return ret;
        }

        /* link forward and backward */
        sw_dev->device = client;
        i2c_set_clientdata(client, sw_dev);
        sw_dev->chip.dev = &client->dev;

        sw_dev->chip.ops = &lan9303_indirect_phy_ops;

        ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
        if (ret != 0)
                return ret;

        dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");

        return 0;
}

static void lan9303_i2c_remove(struct i2c_client *client)
{
        struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);

        if (!sw_dev)
                return;

        lan9303_remove(&sw_dev->chip);
}

static void lan9303_i2c_shutdown(struct i2c_client *client)
{
        struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);

        if (!sw_dev)
                return;

        lan9303_shutdown(&sw_dev->chip);

        i2c_set_clientdata(client, NULL);
}

/*-------------------------------------------------------------------------*/

static const struct i2c_device_id lan9303_i2c_id[] = {
        { "lan9303" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);

static const struct of_device_id lan9303_i2c_of_match[] = {
        { .compatible = "smsc,lan9303-i2c", },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);

static struct i2c_driver lan9303_i2c_driver = {
        .driver = {
                .name = "LAN9303_I2C",
                .of_match_table = lan9303_i2c_of_match,
        },
        .probe = lan9303_i2c_probe,
        .remove = lan9303_i2c_remove,
        .shutdown = lan9303_i2c_shutdown,
        .id_table = lan9303_i2c_id,
};
module_i2c_driver(lan9303_i2c_driver);

MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
MODULE_LICENSE("GPL v2");