This patch adds a driver for the Zodiac Aerospace RAVE Watchdog Procesor.
This device implements a watchdog timer, accessible over I2C.
This driver implements some functionality that isn't exposed via the
standard API and so the driver functionality has also been exposed via
sysfs.
Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx>
---
drivers/watchdog/Kconfig | 11 +
drivers/watchdog/Makefile | 1 +
drivers/watchdog/ziirave_wdt.c | 648 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 660 insertions(+)
create mode 100644 drivers/watchdog/ziirave_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 7a8a6c6..816b5fb 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -161,6 +161,17 @@ config XILINX_WATCHDOG
To compile this driver as a module, choose M here: the
module will be called of_xilinx_wdt.
+config ZIIRAVE_WATCHDOG
+ tristate "Zodiac RAVE Watchdog Timer"
+ depends on I2C
+ select WATCHDOG_CORE
+ help
+ Watchdog driver for the Zodiac Aerospace RAVE Switch Watchdog
+ Processor.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ziirave_wdt.
+
# ALPHA Architecture
# ARM Architecture
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 53d4827..05ba23a 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -190,5 +190,6 @@ obj-$(CONFIG_GPIO_WATCHDOG) += gpio_wdt.o
obj-$(CONFIG_WM831X_WATCHDOG) += wm831x_wdt.o
obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
obj-$(CONFIG_MAX63XX_WATCHDOG) += max63xx_wdt.o
+obj-$(CONFIG_ZIIRAVE_WATCHDOG) += ziirave_wdt.o
obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
obj-$(CONFIG_MENF21BMC_WATCHDOG) += menf21bmc_wdt.o
diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
new file mode 100644
index 0000000..7577c25
--- /dev/null
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -0,0 +1,648 @@
+/*
+ * Copyright (C) 2015 Zodiac Inflight Innovations
+ *
+ * Author: Martyn Welch <martyn.welch@xxxxxxxxxxxxxxx>
+ *
+ * Based on twl4030_wdt.c by Timo Kokkonen <timo.t.kokkonen at nokia.com>:
+ *
+ * Copyright (C) Nokia Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/watchdog.h>
+#include <linux/i2c.h>
+#include <linux/version.h>
+#include <linux/sysfs.h>
+
+#define ZIIRAVE_TIMEOUT_MIN 3
+#define ZIIRAVE_TIMEOUT_DEFAULT 30
+#define ZIIRAVE_TIMEOUT_MAX 255
+
+#define ZIIRAVE_PING_VALUE 0x0
+#define ZIIRAVE_RESET_VALUE 0x1
+
+#define ZIIRAVE_STATE_INITIAL 0x0
+#define ZIIRAVE_STATE_OFF 0x1
+#define ZIIRAVE_STATE_ON 0x2
+#define ZIIRAVE_STATE_TRIGGERED 0x3
+
+static char *ziirave_states[] = {"unconfigured", "disabled", "enabled",
+ "triggered"};
+
+#define ZIIRAVE_REASON_POWER_UP 0x0
+#define ZIIRAVE_REASON_HW_WDT 0x1
+#define ZIIRAVE_REASON_HOST_REQ 0x4
+#define ZIIRAVE_REASON_IGL_CFG 0x6
+#define ZIIRAVE_REASON_IGL_INST 0x7
+#define ZIIRAVE_REASON_IGL_TRAP 0x8
+#define ZIIRAVE_REASON_UNKNOWN 0x9
+
+static char *ziirave_reasons[] = {"power cycle", "triggered", "host request",
+ "illegal configuration", "illegal instruction", "illegal trap",
+ "unknown"};
+
+#define ZIIRAVE_WDT_FIRM_VER_MAJOR 0x1
+#define ZIIRAVE_WDT_FIRM_VER_MINOR 0x2
+#define ZIIRAVE_WDT_BOOT_VER_MAJOR 0x3
+#define ZIIRAVE_WDT_BOOT_VER_MINOR 0x4
+#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_WDT_RESET_WDT 0xb
+#define ZIIRAVE_WDT_GOTO_BOOTLOADER 0xc
+#define ZIIRAVE_WDT_FORCE_RESET_HOST 0xd
+
+struct ziirave_wdt_rev {
+ unsigned char part;
+ unsigned char major;
+ unsigned char minor;
+};
+
+struct ziirave_wdt_data {
+ struct ziirave_wdt_rev bootloader_rev;
+ struct ziirave_wdt_rev firmware_rev;
+ int reset_reason;
+};
+
+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_firmware_rev(struct watchdog_device *wdd,
+ struct ziirave_wdt_rev *rev)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ rev->part = 2;
+ rev->major = (char)i2c_smbus_read_byte_data(client,
+ ZIIRAVE_WDT_FIRM_VER_MAJOR);
+
+ rev->minor = (char)i2c_smbus_read_byte_data(client,
+ ZIIRAVE_WDT_FIRM_VER_MINOR);
+
+ return 0;
+}
+
+static int ziirave_wdt_bootloader_rev(struct watchdog_device *wdd,
+ struct ziirave_wdt_rev *rev)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ rev->part = 1;
+ rev->major = (char)i2c_smbus_read_byte_data(client,
+ ZIIRAVE_WDT_BOOT_VER_MAJOR);
+
+ rev->minor = (char)i2c_smbus_read_byte_data(client,
+ ZIIRAVE_WDT_BOOT_VER_MINOR);
+
+ return 0;
+}
+
+static int ziirave_wdt_reason(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_RESET_REASON);
+}
+
+static int ziirave_wdt_get_state(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_STATE);
+}
+
+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_get_timeout(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
+}
+
+static int ziirave_wdt_set_timeout(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+ int ret;
+
+ if (watchdog_timeout_invalid(wdd, timeout))
+ return -EINVAL;
+
+ ret = i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT,
+ (char)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);
+
+ return i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIME_LEFT);
+}
+
+static int ziirave_wdt_set_resettime(struct watchdog_device *wdd,
+ unsigned int timeout)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ if (timeout < 0 || timeout > 256)
+ return -EINVAL;
+
+ return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_TIMEOUT,
+ (char)timeout);
+}
+
+static unsigned int ziirave_wdt_get_resettime(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_RESET_DURATION);
+}
+
+static int ziirave_wdt_resetwdt(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_RESET_WDT, 0x1);
+}
+
+static int ziirave_wdt_resetwdt_bootloader(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_GOTO_BOOTLOADER,
+ 0x1);
+}
+
+static int ziirave_wdt_resethost(struct watchdog_device *wdd)
+{
+ struct i2c_client *client = to_i2c_client(wdd->parent);
+
+ return i2c_smbus_write_byte_data(client, ZIIRAVE_WDT_FORCE_RESET_HOST,
+ 0x1);
+}
+
+static const struct watchdog_info ziirave_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
+ .identity = "Zodiac RAVE 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 watchdog_device *wdd = i2c_get_clientdata(client);
+ struct ziirave_wdt_data *w_priv = watchdog_get_drvdata(wdd);
+
+ return sprintf(buf, "%02u.%02u.%02u", w_priv->firmware_rev.part,
+ w_priv->firmware_rev.major, w_priv->firmware_rev.minor);
+}
+
+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 watchdog_device *wdd = i2c_get_clientdata(client);
+ struct ziirave_wdt_data *w_priv = watchdog_get_drvdata(wdd);
+
+ return sprintf(buf, "%02u.%02u.%02u", w_priv->bootloader_rev.part,
+ w_priv->bootloader_rev.major,
+ w_priv->bootloader_rev.minor);
+}
+
+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 watchdog_device *wdd = i2c_get_clientdata(client);
+ struct ziirave_wdt_data *w_priv = watchdog_get_drvdata(wdd);
+
+ if ((w_priv->reset_reason < 0) ||
+ (w_priv->reset_reason >= ARRAY_SIZE(ziirave_states)))
+ return sprintf(buf, "error");
+
+ return sprintf(buf, "%s", ziirave_reasons[w_priv->reset_reason]);
+}
+
+static DEVICE_ATTR(reset_reason, S_IRUGO, ziirave_wdt_sysfs_show_reason,
+ NULL);
+
+static ssize_t ziirave_wdt_sysfs_store_state(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+ int state;
+
+ if (!strcmp(buf, "enabled") || !strcmp(buf, "enabled\n"))
+ state = ZIIRAVE_STATE_ON;
+ else if (!strcmp(buf, "disabled") || !strcmp(buf, "disabled\n"))
+ state = ZIIRAVE_STATE_OFF;
+ else
+ return -EINVAL;
+
+ mutex_lock(&wdd->lock);
+
+ ret = ziirave_wdt_set_state(wdd, state);
+ if (ret) {
+ mutex_unlock(&wdd->lock);
+ return -EIO;
+ }
+
+ if (state == ZIIRAVE_STATE_ON)
+ set_bit(WDOG_ACTIVE, &wdd->status);
+ else
+ clear_bit(WDOG_ACTIVE, &wdd->status);
+
+ mutex_unlock(&wdd->lock);
+
+ return count;
+}
+
+static ssize_t ziirave_wdt_sysfs_show_state(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ ret = ziirave_wdt_get_state(wdd);
+ if (ret < 0)
+ return ret;
+
+ if (ret >= ARRAY_SIZE(ziirave_states))
+ return sprintf(buf, "Invalid");
+
+ return sprintf(buf, "%s", ziirave_states[ret]);
+}
+
+static DEVICE_ATTR(state, S_IRUGO|S_IWUSR,
+ ziirave_wdt_sysfs_show_state, ziirave_wdt_sysfs_store_state);
+
+static ssize_t ziirave_wdt_sysfs_store_timeout(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+ int timeout;
+
+ ret = kstrtouint(buf, 0, &timeout);
+ if (ret)
+ return ret;
+
+ mutex_lock(&wdd->lock);
+
+ ret = ziirave_wdt_set_timeout(wdd, timeout);
+ if (ret) {
+ mutex_unlock(&wdd->lock);
+ return ret;
+ }
+
+ mutex_unlock(&wdd->lock);
+
+ return count;
+}
+
+static ssize_t ziirave_wdt_sysfs_show_timeout(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ ret = ziirave_wdt_get_timeout(wdd);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%u", ret);
+}
+
+static DEVICE_ATTR(timeout, S_IRUGO|S_IWUSR,
+ ziirave_wdt_sysfs_show_timeout,
+ ziirave_wdt_sysfs_store_timeout);
+
+static ssize_t ziirave_wdt_sysfs_show_timeleft(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ ret = ziirave_wdt_get_timeout(wdd);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%u", ret);
+}
+
+static DEVICE_ATTR(timeleft, S_IRUGO,
+ ziirave_wdt_sysfs_show_timeleft, NULL);
+
+static ssize_t ziirave_wdt_sysfs_store_pet(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ ret = ziirave_wdt_get_state(wdd);
+ if (ret != ZIIRAVE_STATE_ON)
+ return -EINVAL;
+
+ ret = ziirave_wdt_ping(wdd);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(keepalive, S_IRUGO|S_IWUSR, NULL,
+ ziirave_wdt_sysfs_store_pet);
+
+static ssize_t ziirave_wdt_sysfs_store_reset_time(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+ int reset_time;
+
+ ret = kstrtouint(buf, 0, &reset_time);
+ if (ret)
+ return ret;
+
+ ret = ziirave_wdt_set_resettime(wdd, reset_time);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static ssize_t ziirave_wdt_sysfs_show_reset_time(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ ret = ziirave_wdt_get_resettime(wdd);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%u", ret);
+}
+
+static DEVICE_ATTR(reset_duration, S_IRUGO|S_IWUSR,
+ ziirave_wdt_sysfs_show_reset_time,
+ ziirave_wdt_sysfs_store_reset_time);
+
+static ssize_t ziirave_wdt_sysfs_store_reset_processor(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ if (strcmp(buf, "reset") && strcmp(buf, "reset\n"))
+ return -EINVAL;
+
+ ret = ziirave_wdt_resetwdt(wdd);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(reset_wdt, S_IRUGO|S_IWUSR, NULL,
+ ziirave_wdt_sysfs_store_reset_processor);
+
+static ssize_t ziirave_wdt_sysfs_store_wdt_to_bootloader(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ if (strcmp(buf, "reset") && strcmp(buf, "reset\n"))
+ return -EINVAL;
+
+ ret = ziirave_wdt_resetwdt_bootloader(wdd);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(reset_bootloader, S_IRUGO|S_IWUSR, NULL,
+ ziirave_wdt_sysfs_store_wdt_to_bootloader);
+
+static ssize_t ziirave_wdt_sysfs_store_reset_host(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev->parent);
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+ int ret;
+
+ if (strcmp(buf, "reset") && strcmp(buf, "reset\n"))
+ return -EINVAL;
+
+ ret = ziirave_wdt_resethost(wdd);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(force_reset, S_IRUGO|S_IWUSR, NULL,
+ ziirave_wdt_sysfs_store_reset_host);
+
+static struct attribute *ziirave_wdt_attrs[] = {
+ &dev_attr_firmware_version.attr,
+ &dev_attr_bootloader_version.attr,
+ &dev_attr_reset_reason.attr,
+ &dev_attr_state.attr,
+ &dev_attr_timeout.attr,
+ &dev_attr_timeleft.attr,
+ &dev_attr_keepalive.attr,
+ &dev_attr_reset_duration.attr,
+ &dev_attr_reset_wdt.attr,
+ &dev_attr_reset_bootloader.attr,
+ &dev_attr_force_reset.attr,
+ NULL
+};
+
+static const struct attribute_group ziirave_wdt_sysfs_files = {
+ .attrs = ziirave_wdt_attrs,
+};
+
+static int ziirave_wdt_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret = 0;
+ struct watchdog_device *wdd;
+ struct ziirave_wdt_data *w_priv;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C
+ | I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_I2C_BLOCK))
+ return -ENODEV;
+
+ wdd = devm_kzalloc(&client->dev, sizeof(*wdd), GFP_KERNEL);
+ if (!wdd)
+ return -ENOMEM;
+
+ w_priv = devm_kzalloc(&client->dev, sizeof(*w_priv), GFP_KERNEL);
+ if (!wdd)
+ return -ENOMEM;
+
+ wdd->info = &ziirave_wdt_info;
+ wdd->ops = &ziirave_wdt_ops;
+ wdd->status = 0;
+ wdd->timeout = i2c_smbus_read_byte_data(client, ZIIRAVE_WDT_TIMEOUT);
+ wdd->min_timeout = ZIIRAVE_TIMEOUT_MIN;
+ wdd->max_timeout = ZIIRAVE_TIMEOUT_MAX;
+ wdd->parent = &client->dev;
+
+ watchdog_set_nowayout(wdd, nowayout);
+
+ i2c_set_clientdata(client, wdd);
+
+ ziirave_wdt_stop(wdd);
+
+ ret = watchdog_register_device(wdd);
+ if (ret)
+ return ret;
+
+ ret = ziirave_wdt_firmware_rev(wdd, &w_priv->firmware_rev);
+ if (ret)
+ goto err;
+
+ ret = ziirave_wdt_bootloader_rev(wdd, &w_priv->bootloader_rev);
+ if (ret)
+ goto err;
+
+ w_priv->reset_reason = ziirave_wdt_reason(wdd);
+ if ((ret < 0) || (ret >= ARRAY_SIZE(ziirave_reasons)))
+ goto err;
+
+ watchdog_set_drvdata(wdd, w_priv);
+
+ ret = sysfs_create_group(&wdd->dev->kobj, &ziirave_wdt_sysfs_files);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ watchdog_unregister_device(wdd);
+
+ return ret;
+}
+
+static int ziirave_wdt_remove(struct i2c_client *client)
+{
+ struct watchdog_device *wdd = i2c_get_clientdata(client);
+
+ sysfs_remove_group(&client->dev.kobj, &ziirave_wdt_sysfs_files);
+
+ watchdog_unregister_device(wdd);
+
+ return 0;
+}
+
+static struct i2c_device_id ziirave_wdt_id[] = {
+ { "ziirave-wdt", 0 },
+ { }
+};
+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@xxxxxxxxxxxxxxx");
+MODULE_DESCRIPTION("Zodiac Aerospace RAVE Switch Watchdog Processor Driver");
+MODULE_LICENSE("GPL");
+
--
2.1.4
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