Device watchdog pretimeout governor sends a notification back to a
watchdog device for further handling. This governor does nothing, if
watchdog driver does not define a pretimeout callback.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
---
drivers/watchdog/Kconfig | 15 +++++++++++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/pretimeout_device.c | 49 ++++++++++++++++++++++++++++++++++++
include/linux/watchdog.h | 2 ++
4 files changed, 67 insertions(+)
create mode 100644 drivers/watchdog/pretimeout_device.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 7e9e2bb..6c1f7e1 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1662,6 +1662,13 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_USERSPACE
Use userspace notifier watchdog pretimeout governor
by default.
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_DEVICE
+ bool "device"
+ select WATCHDOG_PRETIMEOUT_GOV_DEVICE
+ help
+ Use device specific watchdog pretimeout event handler
+ by default.
+
endchoice
config WATCHDOG_PRETIMEOUT_GOV_NOOP
@@ -1683,6 +1690,14 @@ config WATCHDOG_PRETIMEOUT_GOV_USERSPACE
pretimeout event send a notification to userspace for
further handling.
+config WATCHDOG_PRETIMEOUT_GOV_DEVICE
+ tristate "Own device watchdog pretimeout governor"
+ help
+ Device watchdog pretimeout governor sends a notification
+ back to a watchdog device for further handling. This governor
+ does nothing, if watchdog driver does not define a pretimeout
+ callback.
+
endif # WATCHDOG_PRETIMEOUT_GOV
endif # WATCHDOG
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 7d6755b..0717b64 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -11,6 +11,7 @@ watchdog-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV) += watchdog_pretimeout.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PANIC) += pretimeout_panic.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_USERSPACE) += pretimeout_userspace.o
+obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_DEVICE) += pretimeout_device.o
# Only one watchdog can succeed. We probe the ISA/PCI/USB based
# watchdog-cards first, then the architecture specific watchdog
diff --git a/drivers/watchdog/pretimeout_device.c b/drivers/watchdog/pretimeout_device.c
new file mode 100644
index 0000000..4ce992b
--- /dev/null
+++ b/drivers/watchdog/pretimeout_device.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2015 Mentor Graphics
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/watchdog.h>
+
+#include <watchdog_pretimeout.h>
+
+/**
+ * pretimeout_device - Run device specific handler on watchdog pretimeout event
+ * @wdd - watchdog_device
+ *
+ */
+static void pretimeout_device(struct watchdog_device *wdd)
+{
+ if (wdd->ops->pretimeout)
+ wdd->ops->pretimeout(wdd);
+}
+
+static struct watchdog_governor watchdog_gov_device = {
+ .name = "device",
+ .pretimeout = pretimeout_device,
+#ifdef CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_DEVICE
+ .is_default = true,
+#endif
+};
+
+static int __init watchdog_gov_device_register(void)
+{
+ return watchdog_register_governor(&watchdog_gov_device);
+}
+
+static void __exit watchdog_gov_device_unregister(void)
+{
+ watchdog_unregister_governor(&watchdog_gov_device);
+}
+module_init(watchdog_gov_device_register);
+module_exit(watchdog_gov_device_unregister);
+
+MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Device specific watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 960223e..597dcfb 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -27,6 +27,7 @@ struct watchdog_governor;
* @status: The routine that shows the status of the watchdog device.
* @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).
+ * @pretimeout: The routine that runs driver specific handler of pretimeout event.
* @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.
@@ -46,6 +47,7 @@ struct watchdog_ops {
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
unsigned int (*get_timeleft)(struct watchdog_device *);
+ void (*pretimeout)(struct watchdog_device *);
void (*ref)(struct watchdog_device *);
void (*unref)(struct watchdog_device *);
long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
--
2.1.4
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