diff options
Diffstat (limited to 'drivers/base/class.c')
| -rw-r--r-- | drivers/base/class.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/base/class.c b/drivers/base/class.c index a3b006b..479c125 100644 --- a/drivers/base/class.c +++ b/drivers/base/class.c @@ -173,6 +173,17 @@ static void class_device_create_release(struct class_device *class_dev) kfree(class_dev); } +/** + * class_create - create a struct class structure + * @owner: pointer to the module that is to "own" this struct class + * @name: pointer to a string for the name of this class. + * + * This is used to create a struct class pointer that can then be used + * in calls to class_device_create(). + * + * Note, the pointer created here is to be destroyed when finished by + * making a call to class_destroy(). + */ struct class *class_create(struct module *owner, char *name) { struct class *cls; @@ -201,6 +212,13 @@ error: return ERR_PTR(retval); } +/** + * class_destroy - destroys a struct class structure + * @cs: pointer to the struct class that is to be destroyed + * + * Note, the pointer to be destroyed must have been created with a call + * to class_create(). + */ void class_destroy(struct class *cls) { if ((cls == NULL) || (IS_ERR(cls))) @@ -505,6 +523,23 @@ int class_device_register(struct class_device *class_dev) return class_device_add(class_dev); } +/** + * class_device_create - creates a class device and registers it with sysfs + * @cs: pointer to the struct class that this device should be registered to. + * @dev: the dev_t for the char device to be added. + * @device: a pointer to a struct device that is assiociated with this class device. + * @fmt: string for the class device's name + * + * This function can be used by char device classes. A struct + * class_device will be created in sysfs, registered to the specified + * class. A "dev" file will be created, showing the dev_t for the + * device. The pointer to the struct class_device will be returned from + * the call. Any further sysfs files that might be required can be + * created using this pointer. + * + * Note: the struct class passed to this function must have previously + * been created with a call to class_create(). + */ struct class_device *class_device_create(struct class *cls, dev_t devt, struct device *device, char *fmt, ...) { @@ -578,6 +613,14 @@ void class_device_unregister(struct class_device *class_dev) class_device_put(class_dev); } +/** + * class_device_destroy - removes a class device that was created with class_device_create() + * @cls: the pointer to the struct class that this device was registered * with. + * @dev: the dev_t of the device that was previously registered. + * + * This call unregisters and cleans up a class device that was created with a + * call to class_device_create() + */ void class_device_destroy(struct class *cls, dev_t devt) { struct class_device *class_dev = NULL; |
