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watchdog: Add multiple device support

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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
commit 45f5fed30a
5 changed files with 140 additions and 50 deletions
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6
include/linux/watchdog.h
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@ -54,6 +54,8 @@ struct watchdog_info {
#ifdef __KERNEL__
#include <linux/bitops.h>
#include <linux/device.h>
#include <linux/cdev.h>
struct watchdog_ops;
struct watchdog_device;
@ -89,6 +91,8 @@ struct watchdog_ops {
/** struct watchdog_device - The structure that defines a watchdog device
*
* @id: The watchdog's ID. (Allocated by watchdog_register_device)
* @cdev: The watchdog's Character device.
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
* @bootstatus: Status of the watchdog device at boot.
@ -105,6 +109,8 @@ struct watchdog_ops {
* via the watchdog_set_drvdata and watchdog_get_drvdata helpers.
*/
struct watchdog_device {
int id;
struct cdev cdev;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;