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| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-10-07 15:39:57 +0300 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2016-10-08 10:27:24 +0200 |
| commit | 89873a711dd20b614abb6e4038fb4b5462f4c701 (patch) | |
| tree | 88fadc0684b9936a9c60eae9cf91ccacd409003e /drivers/watchdog | |
| parent | 53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb (diff) | |
| download | linux-89873a711dd20b614abb6e4038fb4b5462f4c701.tar.gz linux-89873a711dd20b614abb6e4038fb4b5462f4c701.tar.xz | |
watchdog: pretimeout: add pretimeout_available_governors attribute
The change adds an option to a user with CONFIG_WATCHDOG_SYSFS and
CONFIG_WATCHDOG_PRETIMEOUT_GOV enabled to get information about all
registered watchdog pretimeout governors by reading watchdog device
attribute named "pretimeout_available_governors".
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/watchdog_dev.c | 11 | ||||
| -rw-r--r-- | drivers/watchdog/watchdog_pretimeout.c | 15 | ||||
| -rw-r--r-- | drivers/watchdog/watchdog_pretimeout.h | 6 |
3 files changed, 31 insertions, 1 deletions
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c index 3fdbe0ab1365..32930a073a12 100644 --- a/drivers/watchdog/watchdog_dev.c +++ b/drivers/watchdog/watchdog_dev.c @@ -489,6 +489,13 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(state); +static ssize_t pretimeout_available_governors_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return watchdog_pretimeout_available_governors_get(buf); +} +static DEVICE_ATTR_RO(pretimeout_available_governors); + static ssize_t pretimeout_governor_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -524,7 +531,8 @@ static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr, else if (attr == &dev_attr_pretimeout.attr && !(wdd->info->options & WDIOF_PRETIMEOUT)) mode = 0; - else if (attr == &dev_attr_pretimeout_governor.attr && + else if ((attr == &dev_attr_pretimeout_governor.attr || + attr == &dev_attr_pretimeout_available_governors.attr) && (!(wdd->info->options & WDIOF_PRETIMEOUT) || !IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV))) mode = 0; @@ -541,6 +549,7 @@ static struct attribute *wdt_attrs[] = { &dev_attr_status.attr, &dev_attr_nowayout.attr, &dev_attr_pretimeout_governor.attr, + &dev_attr_pretimeout_available_governors.attr, NULL, }; diff --git a/drivers/watchdog/watchdog_pretimeout.c b/drivers/watchdog/watchdog_pretimeout.c index c9e4a0326938..9db07bfb4334 100644 --- a/drivers/watchdog/watchdog_pretimeout.c +++ b/drivers/watchdog/watchdog_pretimeout.c @@ -52,6 +52,21 @@ static struct governor_priv *find_governor_by_name(const char *gov_name) return NULL; } +int watchdog_pretimeout_available_governors_get(char *buf) +{ + struct governor_priv *priv; + int count = 0; + + mutex_lock(&governor_lock); + + list_for_each_entry(priv, &governor_list, entry) + count += sprintf(buf + count, "%s\n", priv->gov->name); + + mutex_unlock(&governor_lock); + + return count; +} + int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf) { int count = 0; diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h index 6cd6c89a411c..a5a32b39c56d 100644 --- a/drivers/watchdog/watchdog_pretimeout.h +++ b/drivers/watchdog/watchdog_pretimeout.h @@ -18,6 +18,7 @@ void watchdog_unregister_governor(struct watchdog_governor *gov); /* Interfaces to watchdog_dev.c */ int watchdog_register_pretimeout(struct watchdog_device *wdd); void watchdog_unregister_pretimeout(struct watchdog_device *wdd); +int watchdog_pretimeout_available_governors_get(char *buf); int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf); int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, const char *buf); @@ -38,6 +39,11 @@ static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd) { } +static inline int watchdog_pretimeout_available_governors_get(char *buf) +{ + return -EINVAL; +} + static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf) { |