diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/009-4-watchdog-Read-device-status-through-sysfs-attributes.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.4/009-4-watchdog-Read-device-status-through-sysfs-attributes.patch | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.4/009-4-watchdog-Read-device-status-through-sysfs-attributes.patch b/target/linux/ipq806x/patches-4.4/009-4-watchdog-Read-device-status-through-sysfs-attributes.patch new file mode 100644 index 0000000000..fd4b38a9fb --- /dev/null +++ b/target/linux/ipq806x/patches-4.4/009-4-watchdog-Read-device-status-through-sysfs-attributes.patch @@ -0,0 +1,260 @@ +From 33b711269ade3f6bc9d9d15e4343e6fa922d999b Mon Sep 17 00:00:00 2001 +From: Pratyush Anand <panand@redhat.com> +Date: Thu, 17 Dec 2015 17:53:59 +0530 +Subject: watchdog: Read device status through sysfs attributes + +This patch adds following attributes to watchdog device's sysfs interface +to read its different status. + +* state - reads whether device is active or not +* identity - reads Watchdog device's identity string. +* timeout - reads current timeout. +* timeleft - reads timeleft before watchdog generates a reset +* bootstatus - reads status of the watchdog device at boot +* status - reads watchdog device's internal status bits +* nowayout - reads whether nowayout feature was set or not + +Testing with iTCO_wdt: + # cd /sys/class/watchdog/watchdog1/ + # ls +bootstatus dev device identity nowayout power state +subsystem timeleft timeout uevent + # cat identity +iTCO_wdt + # cat timeout +30 + # cat state +inactive + # echo > /dev/watchdog1 + # cat timeleft +26 + # cat state +active + # cat bootstatus +0 + # cat nowayout +0 + +Signed-off-by: Pratyush Anand <panand@redhat.com> +Reviewed-by: Guenter Roeck <linux@roeck-us.net> +Signed-off-by: Guenter Roeck <linux@roeck-us.net> +Signed-off-by: Wim Van Sebroeck <wim@iguana.be> +--- + Documentation/ABI/testing/sysfs-class-watchdog | 51 +++++++++++ + drivers/watchdog/Kconfig | 7 ++ + drivers/watchdog/watchdog_core.c | 2 +- + drivers/watchdog/watchdog_dev.c | 114 +++++++++++++++++++++++++ + 4 files changed, 173 insertions(+), 1 deletion(-) + create mode 100644 Documentation/ABI/testing/sysfs-class-watchdog + +--- /dev/null ++++ b/Documentation/ABI/testing/sysfs-class-watchdog +@@ -0,0 +1,51 @@ ++What: /sys/class/watchdog/watchdogn/bootstatus ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It contains status of the watchdog ++ device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of ++ ioctl interface. ++ ++What: /sys/class/watchdog/watchdogn/identity ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It contains identity string of ++ watchdog device. ++ ++What: /sys/class/watchdog/watchdogn/nowayout ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. While reading, it gives '1' if that ++ device supports nowayout feature else, it gives '0'. ++ ++What: /sys/class/watchdog/watchdogn/state ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It gives active/inactive status of ++ watchdog device. ++ ++What: /sys/class/watchdog/watchdogn/status ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It contains watchdog device's ++ internal status bits. It is equivalent to WDIOC_GETSTATUS ++ of ioctl interface. ++ ++What: /sys/class/watchdog/watchdogn/timeleft ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It contains value of time left for ++ reset generation. It is equivalent to WDIOC_GETTIMELEFT of ++ ioctl interface. ++ ++What: /sys/class/watchdog/watchdogn/timeout ++Date: August 2015 ++Contact: Wim Van Sebroeck <wim@iguana.be> ++Description: ++ It is a read only file. It is read to know about current ++ value of timeout programmed. +--- a/drivers/watchdog/Kconfig ++++ b/drivers/watchdog/Kconfig +@@ -46,6 +46,13 @@ config WATCHDOG_NOWAYOUT + get killed. If you say Y here, the watchdog cannot be stopped once + it has been started. + ++config WATCHDOG_SYSFS ++ bool "Read different watchdog information through sysfs" ++ default n ++ help ++ Say Y here if you want to enable watchdog device status read through ++ sysfs attributes. ++ + # + # General Watchdog drivers + # +--- a/drivers/watchdog/watchdog_core.c ++++ b/drivers/watchdog/watchdog_core.c +@@ -249,7 +249,7 @@ static int __watchdog_register_device(st + + devno = wdd->cdev.dev; + wdd->dev = device_create(watchdog_class, wdd->parent, devno, +- NULL, "watchdog%d", wdd->id); ++ wdd, "watchdog%d", wdd->id); + if (IS_ERR(wdd->dev)) { + watchdog_dev_unregister(wdd); + ida_simple_remove(&watchdog_ida, id); +--- a/drivers/watchdog/watchdog_dev.c ++++ b/drivers/watchdog/watchdog_dev.c +@@ -247,6 +247,119 @@ out_timeleft: + return err; + } + ++#ifdef CONFIG_WATCHDOG_SYSFS ++static ssize_t nowayout_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ++ return sprintf(buf, "%d\n", !!test_bit(WDOG_NO_WAY_OUT, &wdd->status)); ++} ++static DEVICE_ATTR_RO(nowayout); ++ ++static ssize_t status_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ssize_t status; ++ unsigned int val; ++ ++ status = watchdog_get_status(wdd, &val); ++ if (!status) ++ status = sprintf(buf, "%u\n", val); ++ ++ return status; ++} ++static DEVICE_ATTR_RO(status); ++ ++static ssize_t bootstatus_show(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ++ return sprintf(buf, "%u\n", wdd->bootstatus); ++} ++static DEVICE_ATTR_RO(bootstatus); ++ ++static ssize_t timeleft_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ssize_t status; ++ unsigned int val; ++ ++ status = watchdog_get_timeleft(wdd, &val); ++ if (!status) ++ status = sprintf(buf, "%u\n", val); ++ ++ return status; ++} ++static DEVICE_ATTR_RO(timeleft); ++ ++static ssize_t timeout_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ++ return sprintf(buf, "%u\n", wdd->timeout); ++} ++static DEVICE_ATTR_RO(timeout); ++ ++static ssize_t identity_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ++ return sprintf(buf, "%s\n", wdd->info->identity); ++} ++static DEVICE_ATTR_RO(identity); ++ ++static ssize_t state_show(struct device *dev, struct device_attribute *attr, ++ char *buf) ++{ ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ ++ if (watchdog_active(wdd)) ++ return sprintf(buf, "active\n"); ++ ++ return sprintf(buf, "inactive\n"); ++} ++static DEVICE_ATTR_RO(state); ++ ++static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr, ++ int n) ++{ ++ struct device *dev = container_of(kobj, struct device, kobj); ++ struct watchdog_device *wdd = dev_get_drvdata(dev); ++ umode_t mode = attr->mode; ++ ++ if (attr == &dev_attr_status.attr && !wdd->ops->status) ++ mode = 0; ++ else if (attr == &dev_attr_timeleft.attr && !wdd->ops->get_timeleft) ++ mode = 0; ++ ++ return mode; ++} ++static struct attribute *wdt_attrs[] = { ++ &dev_attr_state.attr, ++ &dev_attr_identity.attr, ++ &dev_attr_timeout.attr, ++ &dev_attr_timeleft.attr, ++ &dev_attr_bootstatus.attr, ++ &dev_attr_status.attr, ++ &dev_attr_nowayout.attr, ++ NULL, ++}; ++ ++static const struct attribute_group wdt_group = { ++ .attrs = wdt_attrs, ++ .is_visible = wdt_is_visible, ++}; ++__ATTRIBUTE_GROUPS(wdt); ++#else ++#define wdt_groups NULL ++#endif ++ + /* + * watchdog_ioctl_op: call the watchdog drivers ioctl op if defined + * @wdd: the watchdog device to do the ioctl on +@@ -584,6 +697,7 @@ int watchdog_dev_unregister(struct watch + static struct class watchdog_class = { + .name = "watchdog", + .owner = THIS_MODULE, ++ .dev_groups = wdt_groups, + }; + + /* |