xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

watchdog: Add multiple device support

Browse Source 
We keep the old /dev/watchdog interface file for the first watchdog via
miscdev. This is basically a cut and paste of the relevant interface code
from the rtc driver layer tweaked for watchdog.

Revised to fix problems noted by Hans de Goede

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Alan Cox
2012-05-10 21:48:59 +02:00
committed by Wim Van Sebroeck
parent fb5f665816
commit 45f5fed30a
5 changed files with 138 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/watchdog/watchdog-kernel-api.txt
View File

@@ -1,6 +1,6 @@
The Linux WatchDog Timer Driver Core kernel API.
===============================================
Last reviewed: 16-Mar-2012
Last reviewed: 21-May-2012
Wim Van Sebroeck <wim@iguana.be>
@@ -39,6 +39,8 @@ watchdog_device structure.
The watchdog device structure looks like this:
struct watchdog_device {
int id;
struct cdev cdev;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;
@@ -50,6 +52,12 @@ struct watchdog_device {
};
It contains following fields:
* id: set by watchdog_register_device, id 0 is special. It has both a
/dev/watchdog0 cdev (dynamic major, minor 0) as well as the old
/dev/watchdog miscdev. The id is set automatically when calling
watchdog_register_device.
* cdev: cdev for the dynamic /dev/watchdog<id> device nodes. This
field is also populated by watchdog_register_device.
* info: a pointer to a watchdog_info structure. This structure gives some
additional information about the watchdog timer itself. (Like it's unique name)
* ops: a pointer to the list of watchdog operations that the watchdog supports.