diff options
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.txt | 5 | ||||
| -rw-r--r-- | drivers/watchdog/watchdog_core.c | 34 | ||||
| -rw-r--r-- | drivers/watchdog/watchdog_dev.c | 1 | ||||
| -rw-r--r-- | include/linux/watchdog.h | 4 |
4 files changed, 42 insertions, 2 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt index 3c85fc7dc1f..ce1fa22aa70 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 5f987936900..86a57673abf 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 3b22582bcb0..1f011f2d6e4 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 32678a50f98..c3545c5d918 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; |