// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2015 Zodiac Inflight Innovations
 *
 * Author: Martyn Welch <martyn.welch@collabora.co.uk>
 *
 * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>:
 *
 * Copyright (C) Nokia Corporation
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/ihex.h>
#include <linux/firmware.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/watchdog.h>

#include <linux/unaligned.h>

#define ZIIRAVE_TIMEOUT_MIN     3
#define ZIIRAVE_TIMEOUT_MAX     255
#define ZIIRAVE_TIMEOUT_DEFAULT 30

#define ZIIRAVE_PING_VALUE      0x0

#define ZIIRAVE_STATE_INITIAL   0x0
#define ZIIRAVE_STATE_OFF       0x1
#define ZIIRAVE_STATE_ON        0x2

#define ZIIRAVE_FW_NAME         "ziirave_wdt.fw"

static char *ziirave_reasons[] = {"power cycle", "hw watchdog", NULL, NULL,
                                  "host request", NULL, "illegal configuration",
                                  "illegal instruction", "illegal trap",
                                  "unknown"};

#define ZIIRAVE_WDT_FIRM_VER_MAJOR      0x1
#define ZIIRAVE_WDT_BOOT_VER_MAJOR      0x3
#define ZIIRAVE_WDT_RESET_REASON        0x5
#define ZIIRAVE_WDT_STATE               0x6
#define ZIIRAVE_WDT_TIMEOUT             0x7
#define ZIIRAVE_WDT_TIME_LEFT           0x8
#define ZIIRAVE_WDT_PING                0x9
#define ZIIRAVE_WDT_RESET_DURATION      0xa

#define ZIIRAVE_FIRM_PKT_TOTAL_SIZE     20
#define ZIIRAVE_FIRM_PKT_DATA_SIZE      16
#define ZIIRAVE_FIRM_FLASH_MEMORY_START (2 * 0x1600)
#define ZIIRAVE_FIRM_FLASH_MEMORY_END   (2 * 0x2bbf)
#define ZIIRAVE_FIRM_PAGE_SIZE          128

/* Received and ready for next Download packet. */
#define ZIIRAVE_FIRM_DOWNLOAD_ACK       1

/* Firmware commands */
#define ZIIRAVE_CMD_DOWNLOAD_START              0x10
#define ZIIRAVE_CMD_DOWNLOAD_END                0x11
#define ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR      0x12
#define ZIIRAVE_CMD_DOWNLOAD_READ_BYTE          0x13
#define ZIIRAVE_CMD_RESET_PROCESSOR             0x0b
#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER          0x0c
#define ZIIRAVE_CMD_DOWNLOAD_PACKET             0x0e

#define ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC    1
#define ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC       1

struct ziirave_wdt_rev {
        unsigned char major;
        unsigned char minor;
};

struct ziirave_wdt_data {
        struct mutex sysfs_mutex;
        struct watchdog_device wdd;
        struct ziirave_wdt_rev bootloader_rev;
        struct ziirave_wdt_rev firmware_rev;
        int reset_reason;
};

static int wdt_timeout;
module_param(wdt_timeout, int, 0);
MODULE_PARM_DESC(wdt_timeout, "Watchdog timeout in seconds");

static int reset_duration;
module_param(reset_duration, int, 0);
MODULE_PARM_DESC(reset_duration,
                 "Watchdog reset pulse duration in milliseconds");

static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started default="
                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static int ziirave_wdt_revision(struct i2c_client *client,
                                struct ziirave_wdt_rev *rev, u8 command)
{
        int ret;

        ret = i2c_smbus_read_byte_data(client, command);
        if (ret < 0)
                return ret;

        rev->major = ret;

        ret = i2c_smbus_read_byte_data(client, command + 1);
        if (ret < 0)
                return ret;

        rev->minor = ret;

        return 0;
}

static int ziirave_wdt_set_state(struct watchdog_device *wdd, int state)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);

        return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_STATE, state);
}

static int ziirave_wdt_start(struct watchdog_device *wdd)
{
        return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_ON);
}

static int ziirave_wdt_stop(struct watchdog_device *wdd)
{
        return ziirave_wdt_set_state(wdd, ZIIRAVE_STATE_OFF);
}

static int ziirave_wdt_ping(struct watchdog_device *wdd)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);

        return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_PING,
                                         ZIIRAVE_PING_VALUE);
}

static int ziirave_wdt_set_timeout(struct watchdog_device *wdd,
                                   unsigned int timeout)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        int ret;

        ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT, timeout);
        if (!ret)
                wdd->timeout = timeout;

        return ret;
}

static unsigned int ziirave_wdt_get_timeleft(struct watchdog_device *wdd)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        int ret;

        ret = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT);
        if (ret < 0)
                ret = 0;

        return ret;
}

static int ziirave_firm_read_ack(struct watchdog_device *wdd)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        int ret;

        ret = i2c_smbus_read_byte(client);
        if (ret < 0) {
                dev_err(&client->dev, "Failed to read status byte\n");
                return ret;
        }

        return ret == ZIIRAVE_FIRM_DOWNLOAD_ACK ? 0 : -EIO;
}

static int ziirave_firm_set_read_addr(struct watchdog_device *wdd, u32 addr)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        const u16 addr16 = (u16)addr / 2;
        u8 address[2];

        put_unaligned_le16(addr16, address);

        return i2c_smbus_write_block_data(client,
                                          ZIIRAVE_CMD_DOWNLOAD_SET_READ_ADDR,
                                          sizeof(address), address);
}

static bool ziirave_firm_addr_readonly(u32 addr)
{
        return addr < ZIIRAVE_FIRM_FLASH_MEMORY_START ||
               addr > ZIIRAVE_FIRM_FLASH_MEMORY_END;
}

/*
 * ziirave_firm_write_pkt() - Build and write a firmware packet
 *
 * A packet to send to the firmware is composed by following bytes:
 *     Length | Addr0 | Addr1 | Data0 .. Data15 | Checksum |
 * Where,
 *     Length: A data byte containing the length of the data.
 *     Addr0: Low byte of the address.
 *     Addr1: High byte of the address.
 *     Data0 .. Data15: Array of 16 bytes of data.
 *     Checksum: Checksum byte to verify data integrity.
 */
static int __ziirave_firm_write_pkt(struct watchdog_device *wdd,
                                    u32 addr, const u8 *data, u8 len)
{
        const u16 addr16 = (u16)addr / 2;
        struct i2c_client *client = to_i2c_client(wdd->parent);
        u8 i, checksum = 0, packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE];
        int ret;

        /* Check max data size */
        if (len > ZIIRAVE_FIRM_PKT_DATA_SIZE) {
                dev_err(&client->dev, "Firmware packet too long (%d)\n",
                        len);
                return -EMSGSIZE;
        }

        /*
         * Ignore packets that are targeting program memory outisde of
         * app partition, since they will be ignored by the
         * bootloader. At the same time, we need to make sure we'll
         * allow zero length packet that will be sent as the last step
         * of firmware update
         */
        if (len && ziirave_firm_addr_readonly(addr))
                return 0;

        /* Packet length */
        packet[0] = len;
        /* Packet address */
        put_unaligned_le16(addr16, packet + 1);

        memcpy(packet + 3, data, len);
        memset(packet + 3 + len, 0, ZIIRAVE_FIRM_PKT_DATA_SIZE - len);

        /* Packet checksum */
        for (i = 0; i < len + 3; i++)
                checksum += packet[i];
        packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;

        ret = i2c_smbus_write_block_data(client, ZIIRAVE_CMD_DOWNLOAD_PACKET,
                                         sizeof(packet), packet);
        if (ret) {
                dev_err(&client->dev,
                        "Failed to send DOWNLOAD_PACKET: %d\n", ret);
                return ret;
        }

        ret = ziirave_firm_read_ack(wdd);
        if (ret)
                dev_err(&client->dev,
                      "Failed to write firmware packet at address 0x%04x: %d\n",
                      addr, ret);

        return ret;
}

static int ziirave_firm_write_pkt(struct watchdog_device *wdd,
                                  u32 addr, const u8 *data, u8 len)
{
        const u8 max_write_len = ZIIRAVE_FIRM_PAGE_SIZE -
                (addr - ALIGN_DOWN(addr, ZIIRAVE_FIRM_PAGE_SIZE));
        int ret;

        if (len > max_write_len) {
                /*
                 * If data crossed page boundary we need to split this
                 * write in two
                 */
                ret = __ziirave_firm_write_pkt(wdd, addr, data, max_write_len);
                if (ret)
                        return ret;

                addr += max_write_len;
                data += max_write_len;
                len  -= max_write_len;
        }

        return __ziirave_firm_write_pkt(wdd, addr, data, len);
}

static int ziirave_firm_verify(struct watchdog_device *wdd,
                               const struct firmware *fw)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        const struct ihex_binrec *rec;
        int i, ret;
        u8 data[ZIIRAVE_FIRM_PKT_DATA_SIZE];

        for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
                const u16 len = be16_to_cpu(rec->len);
                const u32 addr = be32_to_cpu(rec->addr);

                if (len > sizeof(data))
                        return -EINVAL;

                if (ziirave_firm_addr_readonly(addr))
                        continue;

                ret = ziirave_firm_set_read_addr(wdd, addr);
                if (ret) {
                        dev_err(&client->dev,
                                "Failed to send SET_READ_ADDR command: %d\n",
                                ret);
                        return ret;
                }

                for (i = 0; i < len; i++) {
                        ret = i2c_smbus_read_byte_data(client,
                                                ZIIRAVE_CMD_DOWNLOAD_READ_BYTE);
                        if (ret < 0) {
                                dev_err(&client->dev,
                                        "Failed to READ DATA: %d\n", ret);
                                return ret;
                        }
                        data[i] = ret;
                }

                if (memcmp(data, rec->data, len)) {
                        dev_err(&client->dev,
                                "Firmware mismatch at address 0x%04x\n", addr);
                        return -EINVAL;
                }
        }

        return 0;
}

static int ziirave_firm_upload(struct watchdog_device *wdd,
                               const struct firmware *fw)
{
        struct i2c_client *client = to_i2c_client(wdd->parent);
        const struct ihex_binrec *rec;
        int ret;

        ret = i2c_smbus_write_byte_data(client,
                                        ZIIRAVE_CMD_JUMP_TO_BOOTLOADER,
                                        ZIIRAVE_CMD_JUMP_TO_BOOTLOADER_MAGIC);
        if (ret) {
                dev_err(&client->dev, "Failed to jump to bootloader\n");
                return ret;
        }

        msleep(500);

        ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_START);
        if (ret) {
                dev_err(&client->dev, "Failed to start download\n");
                return ret;
        }

        ret = ziirave_firm_read_ack(wdd);
        if (ret) {
                dev_err(&client->dev, "No ACK for start download\n");
                return ret;
        }

        msleep(500);

        for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
                ret = ziirave_firm_write_pkt(wdd, be32_to_cpu(rec->addr),
                                             rec->data, be16_to_cpu(rec->len));
                if (ret)
                        return ret;
        }

        /*
         * Finish firmware download process by sending a zero length
         * payload
         */
        ret = ziirave_firm_write_pkt(wdd, 0, NULL, 0);
        if (ret) {
                dev_err(&client->dev, "Failed to send EMPTY packet: %d\n", ret);
                return ret;
        }

        /* This sleep seems to be required */
        msleep(20);

        /* Start firmware verification */
        ret = ziirave_firm_verify(wdd, fw);
        if (ret) {
                dev_err(&client->dev,
                        "Failed to verify firmware: %d\n", ret);
                return ret;
        }

        /* End download operation */
        ret = i2c_smbus_write_byte(client, ZIIRAVE_CMD_DOWNLOAD_END);
        if (ret) {
                dev_err(&client->dev,
                        "Failed to end firmware download: %d\n", ret);
                return ret;
        }

        /* Reset the processor */
        ret = i2c_smbus_write_byte_data(client,
                                        ZIIRAVE_CMD_RESET_PROCESSOR,
                                        ZIIRAVE_CMD_RESET_PROCESSOR_MAGIC);
        if (ret) {
                dev_err(&client->dev,
                        "Failed to reset the watchdog: %d\n", ret);
                return ret;
        }

        msleep(500);

        return 0;
}

static const struct watchdog_info ziirave_wdt_info = {
        .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
        .identity = "RAVE Switch Watchdog",
};

static const struct watchdog_ops ziirave_wdt_ops = {
        .owner          = THIS_MODULE,
        .start          = ziirave_wdt_start,
        .stop           = ziirave_wdt_stop,
        .ping           = ziirave_wdt_ping,
        .set_timeout    = ziirave_wdt_set_timeout,
        .get_timeleft   = ziirave_wdt_get_timeleft,
};

static ssize_t ziirave_wdt_sysfs_show_firm(struct device *dev,
                                           struct device_attribute *attr,
                                           char *buf)
{
        struct i2c_client *client = to_i2c_client(dev->parent);
        struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
        int ret;

        ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
        if (ret)
                return ret;

        ret = sysfs_emit(buf, "02.%02u.%02u\n",
                         w_priv->firmware_rev.major,
                         w_priv->firmware_rev.minor);

        mutex_unlock(&w_priv->sysfs_mutex);

        return ret;
}

static DEVICE_ATTR(firmware_version, S_IRUGO, ziirave_wdt_sysfs_show_firm,
                   NULL);

static ssize_t ziirave_wdt_sysfs_show_boot(struct device *dev,
                                           struct device_attribute *attr,
                                           char *buf)
{
        struct i2c_client *client = to_i2c_client(dev->parent);
        struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
        int ret;

        ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
        if (ret)
                return ret;

        ret = sysfs_emit(buf, "01.%02u.%02u\n",
                         w_priv->bootloader_rev.major,
                         w_priv->bootloader_rev.minor);

        mutex_unlock(&w_priv->sysfs_mutex);

        return ret;
}

static DEVICE_ATTR(bootloader_version, S_IRUGO, ziirave_wdt_sysfs_show_boot,
                   NULL);

static ssize_t ziirave_wdt_sysfs_show_reason(struct device *dev,
                                             struct device_attribute *attr,
                                             char *buf)
{
        struct i2c_client *client = to_i2c_client(dev->parent);
        struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
        int ret;

        ret = mutex_lock_interruptible(&w_priv->sysfs_mutex);
        if (ret)
                return ret;

        ret = sysfs_emit(buf, "%s\n", ziirave_reasons[w_priv->reset_reason]);

        mutex_unlock(&w_priv->sysfs_mutex);

        return ret;
}

static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
                   NULL);

static ssize_t ziirave_wdt_sysfs_store_firm(struct device *dev,
                                            struct device_attribute *attr,
                                            const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev->parent);
        struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);
        const struct firmware *fw;
        int err;

        err = request_ihex_firmware(&fw, ZIIRAVE_FW_NAME, dev);
        if (err) {
                dev_err(&client->dev, "Failed to request ihex firmware\n");
                return err;
        }

        err = mutex_lock_interruptible(&w_priv->sysfs_mutex);
        if (err)
                goto release_firmware;

        err = ziirave_firm_upload(&w_priv->wdd, fw);
        if (err) {
                dev_err(&client->dev, "The firmware update failed: %d\n", err);
                goto unlock_mutex;
        }

        /* Update firmware version */
        err = ziirave_wdt_revision(client, &w_priv->firmware_rev,
                                   ZIIRAVE_WDT_FIRM_VER_MAJOR);
        if (err) {
                dev_err(&client->dev, "Failed to read firmware version: %d\n",
                        err);
                goto unlock_mutex;
        }

        dev_info(&client->dev,
                 "Firmware updated to version 02.%02u.%02u\n",
                 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);

        /* Restore the watchdog timeout */
        err = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
        if (err)
                dev_err(&client->dev, "Failed to set timeout: %d\n", err);

unlock_mutex:
        mutex_unlock(&w_priv->sysfs_mutex);

release_firmware:
        release_firmware(fw);

        return err ? err : count;
}

static DEVICE_ATTR(update_firmware, S_IWUSR, NULL,
                   ziirave_wdt_sysfs_store_firm);

static struct attribute *ziirave_wdt_attrs[] = {
        &dev_attr_firmware_version.attr,
        &dev_attr_bootloader_version.attr,
        &dev_attr_reset_reason.attr,
        &dev_attr_update_firmware.attr,
        NULL
};
ATTRIBUTE_GROUPS(ziirave_wdt);

static int ziirave_wdt_init_duration(struct i2c_client *client)
{
        int ret;

        if (!reset_duration) {
                /* See if the reset pulse duration is provided in an of_node */
                if (!client->dev.of_node)
                        ret = -ENODEV;
                else
                        ret = of_property_read_u32(client->dev.of_node,
                                                   "reset-duration-ms",
                                                   &reset_duration);
                if (ret) {
                        dev_info(&client->dev,
                         "No reset pulse duration specified, using default\n");
                        return 0;
                }
        }

        if (reset_duration < 1 || reset_duration > 255)
                return -EINVAL;

        dev_info(&client->dev, "Setting reset duration to %dms",
                 reset_duration);

        return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_DURATION,
                                         reset_duration);
}

static int ziirave_wdt_probe(struct i2c_client *client)
{
        int ret;
        struct ziirave_wdt_data *w_priv;
        int val;

        if (!i2c_check_functionality(client->adapter,
                                     I2C_FUNC_SMBUS_BYTE |
                                     I2C_FUNC_SMBUS_BYTE_DATA |
                                     I2C_FUNC_SMBUS_WRITE_BLOCK_DATA))
                return -ENODEV;

        w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
        if (!w_priv)
                return -ENOMEM;

        mutex_init(&w_priv->sysfs_mutex);

        w_priv->wdd.info = &ziirave_wdt_info;
        w_priv->wdd.ops = &ziirave_wdt_ops;
        w_priv->wdd.min_timeout = ZIIRAVE_TIMEOUT_MIN;
        w_priv->wdd.max_timeout = ZIIRAVE_TIMEOUT_MAX;
        w_priv->wdd.parent = &client->dev;
        w_priv->wdd.groups = ziirave_wdt_groups;

        watchdog_init_timeout(&w_priv->wdd, wdt_timeout, &client->dev);

        /*
         * The default value set in the watchdog should be perfectly valid, so
         * pass that in if we haven't provided one via the module parameter or
         * of property.
         */
        if (w_priv->wdd.timeout == 0) {
                val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
                if (val < 0) {
                        dev_err(&client->dev, "Failed to read timeout\n");
                        return val;
                }

                if (val > ZIIRAVE_TIMEOUT_MAX ||
                    val < ZIIRAVE_TIMEOUT_MIN)
                        val = ZIIRAVE_TIMEOUT_DEFAULT;

                w_priv->wdd.timeout = val;
        }

        ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
        if (ret) {
                dev_err(&client->dev, "Failed to set timeout\n");
                return ret;
        }

        dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout);

        watchdog_set_nowayout(&w_priv->wdd, nowayout);

        i2c_set_clientdata(client, w_priv);

        /* If in unconfigured state, set to stopped */
        val = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
        if (val < 0) {
                dev_err(&client->dev, "Failed to read state\n");
                return val;
        }

        if (val == ZIIRAVE_STATE_INITIAL)
                ziirave_wdt_stop(&w_priv->wdd);

        ret = ziirave_wdt_init_duration(client);
        if (ret) {
                dev_err(&client->dev, "Failed to init duration\n");
                return ret;
        }

        ret = ziirave_wdt_revision(client, &w_priv->firmware_rev,
                                   ZIIRAVE_WDT_FIRM_VER_MAJOR);
        if (ret) {
                dev_err(&client->dev, "Failed to read firmware version\n");
                return ret;
        }

        dev_info(&client->dev,
                 "Firmware version: 02.%02u.%02u\n",
                 w_priv->firmware_rev.major, w_priv->firmware_rev.minor);

        ret = ziirave_wdt_revision(client, &w_priv->bootloader_rev,
                                   ZIIRAVE_WDT_BOOT_VER_MAJOR);
        if (ret) {
                dev_err(&client->dev, "Failed to read bootloader version\n");
                return ret;
        }

        dev_info(&client->dev,
                 "Bootloader version: 01.%02u.%02u\n",
                 w_priv->bootloader_rev.major, w_priv->bootloader_rev.minor);

        w_priv->reset_reason = i2c_smbus_read_byte_data(client,
                                                ZIIRAVE_WDT_RESET_REASON);
        if (w_priv->reset_reason < 0) {
                dev_err(&client->dev, "Failed to read reset reason\n");
                return w_priv->reset_reason;
        }

        if (w_priv->reset_reason >= ARRAY_SIZE(ziirave_reasons) ||
            !ziirave_reasons[w_priv->reset_reason]) {
                dev_err(&client->dev, "Invalid reset reason\n");
                return -ENODEV;
        }

        ret = watchdog_register_device(&w_priv->wdd);

        return ret;
}

static void ziirave_wdt_remove(struct i2c_client *client)
{
        struct ziirave_wdt_data *w_priv = i2c_get_clientdata(client);

        watchdog_unregister_device(&w_priv->wdd);
}

static const struct i2c_device_id ziirave_wdt_id[] = {
        { "rave-wdt" },
        { }
};
MODULE_DEVICE_TABLE(i2c, ziirave_wdt_id);

static const struct of_device_id zrv_wdt_of_match[] = {
        { .compatible = "zii,rave-wdt", },
        { },
};
MODULE_DEVICE_TABLE(of, zrv_wdt_of_match);

static struct i2c_driver ziirave_wdt_driver = {
        .driver = {
                .name = "ziirave_wdt",
                .of_match_table = zrv_wdt_of_match,
        },
        .probe = ziirave_wdt_probe,
        .remove = ziirave_wdt_remove,
        .id_table = ziirave_wdt_id,
};

module_i2c_driver(ziirave_wdt_driver);

MODULE_AUTHOR("Martyn Welch <martyn.welch@collabora.co.uk");
MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
MODULE_LICENSE("GPL");