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From b5e57a9f158a293b1151638336478af8a5aad0f0 Mon Sep 17 00:00:00 2001
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Date: Wed, 14 Nov 2012 19:16:35 +0800
Subject: [PATCH 1/5] watchdog: add keep alive support
this will allow to ping the watchdog via poller
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
drivers/watchdog/Kconfig | 1 +
drivers/watchdog/wd_core.c | 21 +++++++++++++++++++++
include/watchdog.h | 2 ++
3 files changed, 24 insertions(+)
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 2e2900c..0b4dc84 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -4,6 +4,7 @@ config WATCHDOG_IMX_RESET_SOURCE
menuconfig WATCHDOG
bool "Watchdog support"
+ select GENERIC_POLLER
help
Many platforms support a watchdog to keep track of a working machine.
This framework provides routines to handle these watchdogs.
diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c
index 3d0cfc6..a1b9e28 100644
--- a/drivers/watchdog/wd_core.c
+++ b/drivers/watchdog/wd_core.c
@@ -17,18 +17,39 @@
#include <errno.h>
#include <linux/ctype.h>
#include <watchdog.h>
+#include <poller.h>
/*
* Note: this simple framework supports one watchdog only.
*/
static struct watchdog *watchdog;
+static void watchdog_poller_func(struct poller_struct *poller)
+{
+ watchdog->keep_alive(watchdog);
+}
+
+static struct poller_struct watchdog_poller = {
+ .func = watchdog_poller_func,
+};
+
int watchdog_register(struct watchdog *wd)
{
if (watchdog != NULL)
return -EBUSY;
watchdog = wd;
+
+ if (watchdog->keep_alive) {
+ int ret;
+
+ ret = poller_register(&watchdog_poller);
+ if (ret) {
+ watchdog = NULL;
+ return ret;
+ }
+ }
+
return 0;
}
EXPORT_SYMBOL(watchdog_register);
diff --git a/include/watchdog.h b/include/watchdog.h
index 3e2d08e..d5ecf2f 100644
--- a/include/watchdog.h
+++ b/include/watchdog.h
@@ -13,8 +13,10 @@
#ifndef INCLUDE_WATCHDOG_H
# define INCLUDE_WATCHDOG_H
+
struct watchdog {
int (*set_timeout)(struct watchdog *, unsigned);
+ void (*keep_alive)(struct watchdog *);
};
int watchdog_register(struct watchdog *);
--
1.8.1.4
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