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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 10:29:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-10 10:29:23 -0800
commit88266917b518e2ca954d85983470592aaaf82993 (patch)
treee8c6e77cf6c70de0dbe655ce3cd4401391a06b6e /Documentation
parent269d430131b699c2cadf58495f025a4092959ef5 (diff)
parente2bf7c4c22939bd83814d8da40a352d246030b1b (diff)
Merge git://www.linux-watchdog.org/linux-watchdog
* git://www.linux-watchdog.org/linux-watchdog: watchdog: omap_wdt.c: fix the WDIOC_GETBOOTSTATUS ioctl if not implemented. watchdog: new driver for VIA chipsets watchdog: ath79_wdt: flush register writes drivers/watchdog/lantiq_wdt.c: drop iounmap for devm_ allocated data watchdog: documentation: describe nowayout in coversion-guide watchdog: documentation: update index file watchdog: Convert wm831x driver to devm_kzalloc() watchdog: add nowayout helpers to Watchdog Timer Driver Kernel API watchdog: convert drivers/watchdog/* to use module_platform_driver() watchdog: Use DEFINE_SPINLOCK() for static spinlocks watchdog: Convert Wolfson drivers to module_platform_driver
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/watchdog/00-INDEX2
-rw-r--r--Documentation/watchdog/convert_drivers_to_kernel_api.txt19
-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt10
3 files changed, 30 insertions, 1 deletions
diff --git a/Documentation/watchdog/00-INDEX b/Documentation/watchdog/00-INDEX
index fc51128071c2..fc9082a1477a 100644
--- a/Documentation/watchdog/00-INDEX
+++ b/Documentation/watchdog/00-INDEX
@@ -1,5 +1,7 @@
00-INDEX
- this file.
+convert_drivers_to_kernel_api.txt
+ - how-to for converting old watchdog drivers to the new kernel API.
hpwdt.txt
- information on the HP iLO2 NMI watchdog
pcwd-watchdog.txt
diff --git a/Documentation/watchdog/convert_drivers_to_kernel_api.txt b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
index ae1e90036d06..be8119bb15d2 100644
--- a/Documentation/watchdog/convert_drivers_to_kernel_api.txt
+++ b/Documentation/watchdog/convert_drivers_to_kernel_api.txt
@@ -163,6 +163,25 @@ Here is a simple example for a watchdog device:
+};
+Handle the 'nowayout' feature
+-----------------------------
+
+A few drivers use nowayout statically, i.e. there is no module parameter for it
+and only CONFIG_WATCHDOG_NOWAYOUT determines if the feature is going to be
+used. This needs to be converted by initializing the status variable of the
+watchdog_device like this:
+
+ .status = WATCHDOG_NOWAYOUT_INIT_STATUS,
+
+Most drivers, however, also allow runtime configuration of nowayout, usually
+by adding a module parameter. The conversion for this would be something like:
+
+ watchdog_set_nowayout(&s3c2410_wdd, nowayout);
+
+The module parameter itself needs to stay, everything else related to nowayout
+can go, though. This will likely be some code in open(), close() or write().
+
+
Register the watchdog device
----------------------------
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 4f7c894244d2..4b93c28e35c6 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -1,6 +1,6 @@
The Linux WatchDog Timer Driver Core kernel API.
===============================================
-Last reviewed: 22-Jul-2011
+Last reviewed: 29-Nov-2011
Wim Van Sebroeck <wim@iguana.be>
@@ -142,6 +142,14 @@ bit-operations. The status bits that are defined are:
* WDOG_NO_WAY_OUT: this bit stores the nowayout setting for the watchdog.
If this bit is set then the watchdog timer will not be able to stop.
+ To set the WDOG_NO_WAY_OUT status bit (before registering your watchdog
+ timer device) you can either:
+ * set it statically in your watchdog_device struct with
+ .status = WATCHDOG_NOWAYOUT_INIT_STATUS,
+ (this will set the value the same as CONFIG_WATCHDOG_NOWAYOUT) or
+ * use the following helper function:
+ static inline void watchdog_set_nowayout(struct watchdog_device *wdd, int nowayout)
+
Note: The WatchDog Timer Driver Core supports the magic close feature and
the nowayout feature. To use the magic close feature you must set the
WDIOF_MAGICCLOSE bit in the options field of the watchdog's info structure.