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-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt5
-rw-r--r--drivers/watchdog/watchdog_core.c34
-rw-r--r--drivers/watchdog/watchdog_dev.c1
-rw-r--r--include/linux/watchdog.h4
4 files changed, 42 insertions, 2 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 3c85fc7dc1f1..ce1fa22aa70b 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -41,6 +41,8 @@ The watchdog device structure looks like this:
struct watchdog_device {
int id;
struct cdev cdev;
+ struct device *dev;
+ struct device *parent;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;
@@ -58,6 +60,9 @@ It contains following fields:
watchdog_register_device.
* cdev: cdev for the dynamic /dev/watchdog<id> device nodes. This
field is also populated by watchdog_register_device.
+* dev: device under the watchdog class (created by watchdog_register_device).
+* parent: set this to the parent device (or NULL) before calling
+ 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.
diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 5f9879369003..86a57673abf9 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -35,10 +35,12 @@
#include <linux/watchdog.h> /* For watchdog specific items */
#include <linux/init.h> /* For __init/__exit/... */
#include <linux/idr.h> /* For ida_* macros */
+#include <linux/err.h> /* For IS_ERR macros */
#include "watchdog_core.h" /* For watchdog_dev_register/... */
static DEFINE_IDA(watchdog_ida);
+static struct class *watchdog_class;
/**
* watchdog_register_device() - register a watchdog device
@@ -52,7 +54,7 @@ static DEFINE_IDA(watchdog_ida);
*/
int watchdog_register_device(struct watchdog_device *wdd)
{
- int ret, id;
+ int ret, id, devno;
if (wdd == NULL || wdd->info == NULL || wdd->ops == NULL)
return -EINVAL;
@@ -101,6 +103,16 @@ int watchdog_register_device(struct watchdog_device *wdd)
}
}
+ devno = wdd->cdev.dev;
+ wdd->dev = device_create(watchdog_class, wdd->parent, devno,
+ NULL, "watchdog%d", wdd->id);
+ if (IS_ERR(wdd->dev)) {
+ watchdog_dev_unregister(wdd);
+ ida_simple_remove(&watchdog_ida, id);
+ ret = PTR_ERR(wdd->dev);
+ return ret;
+ }
+
return 0;
}
EXPORT_SYMBOL_GPL(watchdog_register_device);
@@ -115,6 +127,7 @@ EXPORT_SYMBOL_GPL(watchdog_register_device);
void watchdog_unregister_device(struct watchdog_device *wdd)
{
int ret;
+ int devno = wdd->cdev.dev;
if (wdd == NULL)
return;
@@ -122,18 +135,35 @@ void watchdog_unregister_device(struct watchdog_device *wdd)
ret = watchdog_dev_unregister(wdd);
if (ret)
pr_err("error unregistering /dev/watchdog (err=%d)\n", ret);
+ device_destroy(watchdog_class, devno);
ida_simple_remove(&watchdog_ida, wdd->id);
+ wdd->dev = NULL;
}
EXPORT_SYMBOL_GPL(watchdog_unregister_device);
static int __init watchdog_init(void)
{
- return watchdog_dev_init();
+ int err;
+
+ watchdog_class = class_create(THIS_MODULE, "watchdog");
+ if (IS_ERR(watchdog_class)) {
+ pr_err("couldn't create class\n");
+ return PTR_ERR(watchdog_class);
+ }
+
+ err = watchdog_dev_init();
+ if (err < 0) {
+ class_destroy(watchdog_class);
+ return err;
+ }
+
+ return 0;
}
static void __exit watchdog_exit(void)
{
watchdog_dev_exit();
+ class_destroy(watchdog_class);
ida_destroy(&watchdog_ida);
}
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 3b22582bcb04..1f011f2d6e48 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -365,6 +365,7 @@ int watchdog_dev_register(struct watchdog_device *watchdog)
int err, devno;
if (watchdog->id == 0) {
+ watchdog_miscdev.parent = watchdog->parent;
err = misc_register(&watchdog_miscdev);
if (err != 0) {
pr_err("%s: cannot register miscdev on minor=%d (err=%d).\n",
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 32678a50f98d..c3545c5d918a 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -95,6 +95,8 @@ struct watchdog_ops {
*
* @id: The watchdog's ID. (Allocated by watchdog_register_device)
* @cdev: The watchdog's Character device.
+ * @dev: The device for our watchdog
+ * @parent: The parent bus device
* @info: Pointer to a watchdog_info structure.
* @ops: Pointer to the list of watchdog operations.
* @bootstatus: Status of the watchdog device at boot.
@@ -113,6 +115,8 @@ struct watchdog_ops {
struct watchdog_device {
int id;
struct cdev cdev;
+ struct device *dev;
+ struct device *parent;
const struct watchdog_info *info;
const struct watchdog_ops *ops;
unsigned int bootstatus;