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-rw-r--r--Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt19
-rw-r--r--drivers/watchdog/Kconfig8
-rw-r--r--drivers/watchdog/Makefile1
-rw-r--r--drivers/watchdog/bcm7038_wdt.c237
-rw-r--r--drivers/watchdog/imx2_wdt.c6
-rw-r--r--drivers/watchdog/intel-mid_wdt.c2
-rw-r--r--drivers/watchdog/watchdog_core.c15
-rw-r--r--drivers/watchdog/watchdog_dev.c163
-rw-r--r--include/linux/watchdog.h23
9 files changed, 380 insertions, 94 deletions
diff --git a/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
new file mode 100644
index 000000000000..84122270be8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/brcm,bcm7038-wdt.txt
@@ -0,0 +1,19 @@
+BCM7038 Watchdog timer
+
+Required properties:
+
+- compatible : should be "brcm,bcm7038-wdt"
+- reg : Specifies base physical address and size of the registers.
+
+Optional properties:
+
+- clocks: The clock running the watchdog. If no clock is found the
+ driver will default to 27000000 Hz.
+
+Example:
+
+watchdog@f040a7e8 {
+ compatible = "brcm,bcm7038-wdt";
+ clocks = <&upg_fixed>;
+ reg = <0xf040a7e8 0x16>;
+};
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 79e1aa1b0959..7a8a6c6952e9 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1313,6 +1313,14 @@ config BCM_KONA_WDT_DEBUG
If in doubt, say 'N'.
+config BCM7038_WDT
+ tristate "BCM7038 Watchdog"
+ select WATCHDOG_CORE
+ help
+ Watchdog driver for the built-in hardware in Broadcom 7038 SoCs.
+
+ Say 'Y or 'M' here to enable the driver.
+
config IMGPDC_WDT
tristate "Imagination Technologies PDC Watchdog Timer"
depends on HAS_IOMEM
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0c616e3f67bb..53d4827ddfe1 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_MESON_WATCHDOG) += meson_wdt.o
obj-$(CONFIG_MEDIATEK_WATCHDOG) += mtk_wdt.o
obj-$(CONFIG_DIGICOLOR_WATCHDOG) += digicolor_wdt.o
obj-$(CONFIG_LPC18XX_WATCHDOG) += lpc18xx_wdt.o
+obj-$(CONFIG_BCM7038_WDT) += bcm7038_wdt.o
# AVR32 Architecture
obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o
diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
new file mode 100644
index 000000000000..4245b65d645c
--- /dev/null
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2015 Broadcom 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/clk.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/watchdog.h>
+
+#define WDT_START_1 0xff00
+#define WDT_START_2 0x00ff
+#define WDT_STOP_1 0xee00
+#define WDT_STOP_2 0x00ee
+
+#define WDT_TIMEOUT_REG 0x0
+#define WDT_CMD_REG 0x4
+
+#define WDT_MIN_TIMEOUT 1 /* seconds */
+#define WDT_DEFAULT_TIMEOUT 30 /* seconds */
+#define WDT_DEFAULT_RATE 27000000
+
+struct bcm7038_watchdog {
+ void __iomem *base;
+ struct watchdog_device wdd;
+ u32 rate;
+ struct clk *clk;
+};
+
+static bool nowayout = WATCHDOG_NOWAYOUT;
+
+static void bcm7038_wdt_set_timeout_reg(struct watchdog_device *wdog)
+{
+ struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
+ u32 timeout;
+
+ timeout = wdt->rate * wdog->timeout;
+
+ writel(timeout, wdt->base + WDT_TIMEOUT_REG);
+}
+
+static int bcm7038_wdt_ping(struct watchdog_device *wdog)
+{
+ struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
+
+ writel(WDT_START_1, wdt->base + WDT_CMD_REG);
+ writel(WDT_START_2, wdt->base + WDT_CMD_REG);
+
+ return 0;
+}
+
+static int bcm7038_wdt_start(struct watchdog_device *wdog)
+{
+ bcm7038_wdt_set_timeout_reg(wdog);
+ bcm7038_wdt_ping(wdog);
+
+ return 0;
+}
+
+static int bcm7038_wdt_stop(struct watchdog_device *wdog)
+{
+ struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
+
+ writel(WDT_STOP_1, wdt->base + WDT_CMD_REG);
+ writel(WDT_STOP_2, wdt->base + WDT_CMD_REG);
+
+ return 0;
+}
+
+static int bcm7038_wdt_set_timeout(struct watchdog_device *wdog,
+ unsigned int t)
+{
+ /* Can't modify timeout value if watchdog timer is running */
+ bcm7038_wdt_stop(wdog);
+ wdog->timeout = t;
+ bcm7038_wdt_start(wdog);
+
+ return 0;
+}
+
+static unsigned int bcm7038_wdt_get_timeleft(struct watchdog_device *wdog)
+{
+ struct bcm7038_watchdog *wdt = watchdog_get_drvdata(wdog);
+ u32 time_left;
+
+ time_left = readl(wdt->base + WDT_CMD_REG);
+
+ return time_left / wdt->rate;
+}
+
+static struct watchdog_info bcm7038_wdt_info = {
+ .identity = "Broadcom BCM7038 Watchdog Timer",
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE
+};
+
+static struct watchdog_ops bcm7038_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = bcm7038_wdt_start,
+ .stop = bcm7038_wdt_stop,
+ .set_timeout = bcm7038_wdt_set_timeout,
+ .get_timeleft = bcm7038_wdt_get_timeleft,
+};
+
+static int bcm7038_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm7038_watchdog *wdt;
+ struct resource *res;
+ int err;
+
+ wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, wdt);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ wdt->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(wdt->base))
+ return PTR_ERR(wdt->base);
+
+ wdt->clk = devm_clk_get(dev, NULL);
+ /* If unable to get clock, use default frequency */
+ if (!IS_ERR(wdt->clk)) {
+ clk_prepare_enable(wdt->clk);
+ wdt->rate = clk_get_rate(wdt->clk);
+ /* Prevent divide-by-zero exception */
+ if (!wdt->rate)
+ wdt->rate = WDT_DEFAULT_RATE;
+ } else {
+ wdt->rate = WDT_DEFAULT_RATE;
+ wdt->clk = NULL;
+ }
+
+ wdt->wdd.info = &bcm7038_wdt_info;
+ wdt->wdd.ops = &bcm7038_wdt_ops;
+ wdt->wdd.min_timeout = WDT_MIN_TIMEOUT;
+ wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
+ wdt->wdd.max_timeout = 0xffffffff / wdt->rate;
+ wdt->wdd.parent = dev;
+ watchdog_set_drvdata(&wdt->wdd, wdt);
+
+ err = watchdog_register_device(&wdt->wdd);
+ if (err) {
+ dev_err(dev, "Failed to register watchdog device\n");
+ clk_disable_unprepare(wdt->clk);
+ return err;
+ }
+
+ dev_info(dev, "Registered BCM7038 Watchdog\n");
+
+ return 0;
+}
+
+static int bcm7038_wdt_remove(struct platform_device *pdev)
+{
+ struct bcm7038_watchdog *wdt = platform_get_drvdata(pdev);
+
+ if (!nowayout)
+ bcm7038_wdt_stop(&wdt->wdd);
+
+ watchdog_unregister_device(&wdt->wdd);
+ clk_disable_unprepare(wdt->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int bcm7038_wdt_suspend(struct device *dev)
+{
+ struct bcm7038_watchdog *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ return bcm7038_wdt_stop(&wdt->wdd);
+
+ return 0;
+}
+
+static int bcm7038_wdt_resume(struct device *dev)
+{
+ struct bcm7038_watchdog *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ return bcm7038_wdt_start(&wdt->wdd);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(bcm7038_wdt_pm_ops, bcm7038_wdt_suspend,
+ bcm7038_wdt_resume);
+
+static void bcm7038_wdt_shutdown(struct platform_device *pdev)
+{
+ struct bcm7038_watchdog *wdt = platform_get_drvdata(pdev);
+
+ if (watchdog_active(&wdt->wdd))
+ bcm7038_wdt_stop(&wdt->wdd);
+}
+
+static const struct of_device_id bcm7038_wdt_match[] = {
+ { .compatible = "brcm,bcm7038-wdt" },
+ {},
+};
+
+static struct platform_driver bcm7038_wdt_driver = {
+ .probe = bcm7038_wdt_probe,
+ .remove = bcm7038_wdt_remove,
+ .shutdown = bcm7038_wdt_shutdown,
+ .driver = {
+ .name = "bcm7038-wdt",
+ .of_match_table = bcm7038_wdt_match,
+ .pm = &bcm7038_wdt_pm_ops,
+ }
+};
+module_platform_driver(bcm7038_wdt_driver);
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Driver for Broadcom 7038 SoCs Watchdog");
+MODULE_AUTHOR("Justin Chen");
diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 0bb1a1d1b170..29ef719a6a3c 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -91,7 +91,7 @@ static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
struct imx2_wdt_device,
restart_handler);
/* Assert SRS signal */
- regmap_write(wdev->regmap, 0, wcr_enable);
+ regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
/*
* Due to imx6q errata ERR004346 (WDOG: WDOG SRS bit requires to be
* written twice), we add another two writes to ensure there must be at
@@ -99,8 +99,8 @@ static int imx2_restart_handler(struct notifier_block *this, unsigned long mode,
* the target check here, since the writes shouldn't be a huge burden
* for other platforms.
*/
- regmap_write(wdev->regmap, 0, wcr_enable);
- regmap_write(wdev->regmap, 0, wcr_enable);
+ regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
+ regmap_write(wdev->regmap, IMX2_WDT_WCR, wcr_enable);
/* wait for reset to assert... */
mdelay(500);
diff --git a/drivers/watchdog/intel-mid_wdt.c b/drivers/watchdog/intel-mid_wdt.c
index 0a436b5d1e84..db36d12e2b52 100644
--- a/drivers/watchdog/intel-mid_wdt.c
+++ b/drivers/watchdog/intel-mid_wdt.c
@@ -101,7 +101,7 @@ static irqreturn_t mid_wdt_irq(int irq, void *dev_id)
static const struct watchdog_info mid_wdt_info = {
.identity = "Intel MID SCU watchdog",
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
};
static const struct watchdog_ops mid_wdt_ops = {
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 1a8059455413..873f13972cf4 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -139,7 +139,7 @@ EXPORT_SYMBOL_GPL(watchdog_init_timeout);
static int __watchdog_register_device(struct watchdog_device *wdd)
{
- int ret, id, devno;
+ int ret, id = -1, devno;
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
return -EINVAL;
@@ -157,7 +157,18 @@ static int __watchdog_register_device(struct watchdog_device *wdd)
*/
mutex_init(&wdd->lock);
- id = ida_simple_get(&watchdog_ida, 0, MAX_DOGS, GFP_KERNEL);
+
+ /* Use alias for watchdog id if possible */
+ if (wdd->parent) {
+ ret = of_alias_get_id(wdd->parent->of_node, "watchdog");
+ if (ret >= 0)
+ id = ida_simple_get(&watchdog_ida, ret,
+ ret + 1, GFP_KERNEL);
+ }
+
+ if (id < 0)
+ id = ida_simple_get(&watchdog_ida, 0, MAX_DOGS, GFP_KERNEL);
+
if (id < 0)
return id;
wdd->id = id;
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 6aaefbad303e..56a649e66eb2 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -51,7 +51,7 @@ static struct watchdog_device *old_wdd;
/*
* watchdog_ping: ping the watchdog.
- * @wddev: the watchdog device to ping
+ * @wdd: the watchdog device to ping
*
* If the watchdog has no own ping operation then it needs to be
* restarted via the start operation. This wrapper function does
@@ -59,65 +59,65 @@ static struct watchdog_device *old_wdd;
* We only ping when the watchdog device is running.
*/
-static int watchdog_ping(struct watchdog_device *wddev)
+static int watchdog_ping(struct watchdog_device *wdd)
{
int err = 0;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_ping;
}
- if (!watchdog_active(wddev))
+ if (!watchdog_active(wdd))
goto out_ping;
- if (wddev->ops->ping)
- err = wddev->ops->ping(wddev); /* ping the watchdog */
+ if (wdd->ops->ping)
+ err = wdd->ops->ping(wdd); /* ping the watchdog */
else
- err = wddev->ops->start(wddev); /* restart watchdog */
+ err = wdd->ops->start(wdd); /* restart watchdog */
out_ping:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_start: wrapper to start the watchdog.
- * @wddev: the watchdog device to start
+ * @wdd: the watchdog device to start
*
* Start the watchdog if it is not active and mark it active.
* This function returns zero on success or a negative errno code for
* failure.
*/
-static int watchdog_start(struct watchdog_device *wddev)
+static int watchdog_start(struct watchdog_device *wdd)
{
int err = 0;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_start;
}
- if (watchdog_active(wddev))
+ if (watchdog_active(wdd))
goto out_start;
- err = wddev->ops->start(wddev);
+ err = wdd->ops->start(wdd);
if (err == 0)
- set_bit(WDOG_ACTIVE, &wddev->status);
+ set_bit(WDOG_ACTIVE, &wdd->status);
out_start:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_stop: wrapper to stop the watchdog.
- * @wddev: the watchdog device to stop
+ * @wdd: the watchdog device to stop
*
* Stop the watchdog if it is still active and unmark it active.
* This function returns zero on success or a negative errno code for
@@ -125,155 +125,154 @@ out_start:
* If the 'nowayout' feature was set, the watchdog cannot be stopped.
*/
-static int watchdog_stop(struct watchdog_device *wddev)
+static int watchdog_stop(struct watchdog_device *wdd)
{
int err = 0;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_stop;
}
- if (!watchdog_active(wddev))
+ if (!watchdog_active(wdd))
goto out_stop;
- if (test_bit(WDOG_NO_WAY_OUT, &wddev->status)) {
- dev_info(wddev->dev, "nowayout prevents watchdog being stopped!\n");
+ if (test_bit(WDOG_NO_WAY_OUT, &wdd->status)) {
+ dev_info(wdd->dev, "nowayout prevents watchdog being stopped!\n");
err = -EBUSY;
goto out_stop;
}
- err = wddev->ops->stop(wddev);
+ err = wdd->ops->stop(wdd);
if (err == 0)
- clear_bit(WDOG_ACTIVE, &wddev->status);
+ clear_bit(WDOG_ACTIVE, &wdd->status);
out_stop:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_get_status: wrapper to get the watchdog status
- * @wddev: the watchdog device to get the status from
+ * @wdd: the watchdog device to get the status from
* @status: the status of the watchdog device
*
* Get the watchdog's status flags.
*/
-static int watchdog_get_status(struct watchdog_device *wddev,
+static int watchdog_get_status(struct watchdog_device *wdd,
unsigned int *status)
{
int err = 0;
*status = 0;
- if (!wddev->ops->status)
+ if (!wdd->ops->status)
return -EOPNOTSUPP;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_status;
}
- *status = wddev->ops->status(wddev);
+ *status = wdd->ops->status(wdd);
out_status:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_set_timeout: set the watchdog timer timeout
- * @wddev: the watchdog device to set the timeout for
+ * @wdd: the watchdog device to set the timeout for
* @timeout: timeout to set in seconds
*/
-static int watchdog_set_timeout(struct watchdog_device *wddev,
+static int watchdog_set_timeout(struct watchdog_device *wdd,
unsigned int timeout)
{
int err;
- if ((wddev->ops->set_timeout == NULL) ||
- !(wddev->info->options & WDIOF_SETTIMEOUT))
+ if (!wdd->ops->set_timeout || !(wdd->info->options & WDIOF_SETTIMEOUT))
return -EOPNOTSUPP;
- if (watchdog_timeout_invalid(wddev, timeout))
+ if (watchdog_timeout_invalid(wdd, timeout))
return -EINVAL;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_timeout;
}
- err = wddev->ops->set_timeout(wddev, timeout);
+ err = wdd->ops->set_timeout(wdd, timeout);
out_timeout:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_get_timeleft: wrapper to get the time left before a reboot
- * @wddev: the watchdog device to get the remaining time from
+ * @wdd: the watchdog device to get the remaining time from
* @timeleft: the time that's left
*
* Get the time before a watchdog will reboot (if not pinged).
*/
-static int watchdog_get_timeleft(struct watchdog_device *wddev,
+static int watchdog_get_timeleft(struct watchdog_device *wdd,
unsigned int *timeleft)
{
int err = 0;
*timeleft = 0;
- if (!wddev->ops->get_timeleft)
+ if (!wdd->ops->get_timeleft)
return -EOPNOTSUPP;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_timeleft;
}
- *timeleft = wddev->ops->get_timeleft(wddev);
+ *timeleft = wdd->ops->get_timeleft(wdd);
out_timeleft:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
/*
* watchdog_ioctl_op: call the watchdog drivers ioctl op if defined
- * @wddev: the watchdog device to do the ioctl on
+ * @wdd: the watchdog device to do the ioctl on
* @cmd: watchdog command
* @arg: argument pointer
*/
-static int watchdog_ioctl_op(struct watchdog_device *wddev, unsigned int cmd,
+static int watchdog_ioctl_op(struct watchdog_device *wdd, unsigned int cmd,
unsigned long arg)
{
int err;
- if (!wddev->ops->ioctl)
+ if (!wdd->ops->ioctl)
return -ENOIOCTLCMD;
- mutex_lock(&wddev->lock);
+ mutex_lock(&wdd->lock);
- if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {
+ if (test_bit(WDOG_UNREGISTERED, &wdd->status)) {
err = -ENODEV;
goto out_ioctl;
}
- err = wddev->ops->ioctl(wddev, cmd, arg);
+ err = wdd->ops->ioctl(wdd, cmd, arg);
out_ioctl:
- mutex_unlock(&wddev->lock);
+ mutex_unlock(&wdd->lock);
return err;
}
@@ -295,6 +294,7 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
struct watchdog_device *wdd = file->private_data;
size_t i;
char c;
+ int err;
if (len == 0)
return 0;
@@ -314,7 +314,9 @@ static ssize_t watchdog_write(struct file *file, const char __user *data,
}
/* someone wrote to us, so we send the watchdog a keepalive ping */
- watchdog_ping(wdd);
+ err = watchdog_ping(wdd);
+ if (err < 0)
+ return err;
return len;
}
@@ -370,8 +372,7 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
case WDIOC_KEEPALIVE:
if (!(wdd->info->options & WDIOF_KEEPALIVEPING))
return -EOPNOTSUPP;
- watchdog_ping(wdd);
- return 0;
+ return watchdog_ping(wdd);
case WDIOC_SETTIMEOUT:
if (get_user(val, p))
return -EFAULT;
@@ -381,7 +382,9 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
/* If the watchdog is active then we send a keepalive ping
* to make sure that the watchdog keep's running (and if
* possible that it takes the new timeout) */
- watchdog_ping(wdd);
+ err = watchdog_ping(wdd);
+ if (err < 0)
+ return err;
/* Fall */
case WDIOC_GETTIMEOUT:
/* timeout == 0 means that we don't know the timeout */
@@ -513,43 +516,43 @@ static struct miscdevice watchdog_miscdev = {
/*
* watchdog_dev_register: register a watchdog device
- * @watchdog: watchdog device
+ * @wdd: watchdog device
*
* Register a watchdog device including handling the legacy
* /dev/watchdog node. /dev/watchdog is actually a miscdevice and
* thus we set it up like that.
*/
-int watchdog_dev_register(struct watchdog_device *watchdog)
+int watchdog_dev_register(struct watchdog_device *wdd)
{
int err, devno;
- if (watchdog->id == 0) {
- old_wdd = watchdog;
- watchdog_miscdev.parent = watchdog->parent;
+ if (wdd->id == 0) {
+ old_wdd = wdd;
+ watchdog_miscdev.parent = wdd->parent;
err = misc_register(&watchdog_miscdev);
if (err != 0) {
pr_err("%s: cannot register miscdev on minor=%d (err=%d).\n",
- watchdog->info->identity, WATCHDOG_MINOR, err);
+ wdd->info->identity, WATCHDOG_MINOR, err);
if (err == -EBUSY)
pr_err("%s: a legacy watchdog module is probably present.\n",
- watchdog->info->identity);
+ wdd->info->identity);
old_wdd = NULL;
return err;
}
}
/* Fill in the data structures */
- devno = MKDEV(MAJOR(watchdog_devt), watchdog->id);
- cdev_init(&watchdog->cdev, &watchdog_fops);
- watchdog->cdev.owner = watchdog->ops->owner;
+ devno = MKDEV(MAJOR(watchdog_devt), wdd->id);
+ cdev_init(&wdd->cdev, &watchdog_fops);
+ wdd->cdev.owner = wdd->ops->owner;
/* Add the device */
- err = cdev_add(&watchdog->cdev, devno, 1);
+ err = cdev_add(&wdd->cdev, devno, 1);
if (err) {
pr_err("watchdog%d unable to add device %d:%d\n",
- watchdog->id, MAJOR(watchdog_devt), watchdog->id);
- if (watchdog->id == 0) {
+ wdd->id, MAJOR(watchdog_devt), wdd->id);
+ if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wdd = NULL;
}
@@ -564,14 +567,14 @@ int watchdog_dev_register(struct watchdog_device *watchdog)
* Unregister the watchdog and if needed the legacy /dev/watchdog device.
*/
-int watchdog_dev_unregister(struct watchdog_device *watchdog)
+int watchdog_dev_unregister(struct watchdog_device *wdd)
{
- mutex_lock(&watchdog->lock);
- set_bit(WDOG_UNREGISTERED, &watchdog->status);
- mutex_unlock(&watchdog->lock);
+ mutex_lock(&wdd->lock);
+ set_bit(WDOG_UNREGISTERED, &wdd->status);
+ mutex_unlock(&wdd->lock);
- cdev_del(&watchdog->cdev);
- if (watchdog->id == 0) {
+ cdev_del(&wdd->cdev);
+ if (wdd->id == 0) {
misc_deregister(&watchdog_miscdev);
old_wdd = NULL;
}
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index d74a0e907b9e..027b1f43f12d 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -24,8 +24,8 @@ struct watchdog_device;
* @stop: The routine for stopping the watchdog device.
* @ping: The routine that sends a keepalive ping to the watchdog device.
* @status: The routine that shows the status of the watchdog device.
- * @set_timeout:The routine for setting the watchdog devices timeout value.
- * @get_timeleft:The routine that get's the time that's left before a reset.
+ * @set_timeout:The routine for setting the watchdog devices timeout value (in seconds).
+ * @get_timeleft:The routine that gets the time left before a reset (in seconds).
* @ref: The ref operation for dyn. allocated watchdog_device structs
* @unref: The unref operation for dyn. allocated watchdog_device structs
* @ioctl: The routines that handles extra ioctl calls.
@@ -33,7 +33,7 @@ struct watchdog_device;
* The watchdog_ops structure contains a list of low-level operations
* that control a watchdog device. It also contains the module that owns
* these operations. The start and stop function are mandatory, all other
- * functions are optonal.
+ * functions are optional.
*/
struct watchdog_ops {
struct module *owner;
@@ -59,9 +59,9 @@ struct watchdog_ops {
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
* @bootstatus: Status of the watchdog device at boot.
- * @timeout: The watchdog devices timeout value.
- * @min_timeout:The watchdog devices minimum timeout value.
- * @max_timeout:The watchdog devices maximum timeout value.
+ * @timeout: The watchdog devices timeout value (in seconds).
+ * @min_timeout:The watchdog devices minimum timeout value (in seconds).
+ * @max_timeout:The watchdog devices maximum timeout value (in seconds).
* @driver-data:Pointer to the drivers private data.
* @lock: Lock for watchdog core internal use only.
* @status: Field that contains the devices internal status bits.
@@ -119,8 +119,15 @@ static inline void watchdog_set_nowayout(struct watchdog_device *wdd, bool noway
/* Use the following function to check if a timeout value is invalid */
static inline bool watchdog_timeout_invalid(struct watchdog_device *wdd, unsigned int t)
{
- return ((wdd->max_timeout != 0) &&
- (t < wdd->min_timeout || t > wdd->max_timeout));
+ /*
+ * The timeout is invalid if
+ * - the requested value is smaller than the configured minimum timeout,
+ * or
+ * - a maximum timeout is configured, and the requested value is larger
+ * than the maximum timeout.
+ */
+ return t < wdd->min_timeout ||
+ (wdd->max_timeout && t > wdd->max_timeout);
}
/* Use the following functions to manipulate watchdog driver specific data */
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 02:40:14 +0000