diff options
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 93 |
1 files changed, 82 insertions, 11 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index be288b5e418..72eccae4904 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1084,11 +1084,13 @@ static void device_create_release(struct device *dev) } /** - * device_create - creates a device and registers it with sysfs + * device_create_vargs - creates a device and registers it with sysfs * @class: pointer to the struct class that this device should be registered to * @parent: pointer to the parent struct device of this new device, if any * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks * @fmt: string for the device's name + * @args: va_list for the device's name * * This function can be used by char device classes. A struct device * will be created in sysfs, registered to the specified class. @@ -1104,10 +1106,10 @@ static void device_create_release(struct device *dev) * Note: the struct class passed to this function must have previously * been created with a call to class_create(). */ -struct device *device_create(struct class *class, struct device *parent, - dev_t devt, const char *fmt, ...) +struct device *device_create_vargs(struct class *class, struct device *parent, + dev_t devt, void *drvdata, const char *fmt, + va_list args) { - va_list args; struct device *dev = NULL; int retval = -ENODEV; @@ -1124,10 +1126,9 @@ struct device *device_create(struct class *class, struct device *parent, dev->class = class; dev->parent = parent; dev->release = device_create_release; + dev_set_drvdata(dev, drvdata); - va_start(args, fmt); vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); - va_end(args); retval = device_register(dev); if (retval) goto error; @@ -1138,6 +1139,78 @@ error: kfree(dev); return ERR_PTR(retval); } +EXPORT_SYMBOL_GPL(device_create_vargs); + +/** + * device_create_drvdata - creates a device and registers it with sysfs + * @class: pointer to the struct class that this device should be registered to + * @parent: pointer to the parent struct device of this new device, if any + * @devt: the dev_t for the char device to be added + * @drvdata: the data to be added to the device for callbacks + * @fmt: string for the device's name + * + * This function can be used by char device classes. A struct device + * will be created in sysfs, registered to the specified class. + * + * A "dev" file will be created, showing the dev_t for the device, if + * the dev_t is not 0,0. + * If a pointer to a parent struct device is passed in, the newly created + * struct device will be a child of that device in sysfs. + * The pointer to the struct 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 device *device_create_drvdata(struct class *class, + struct device *parent, + dev_t devt, + void *drvdata, + const char *fmt, ...) +{ + va_list vargs; + struct device *dev; + + va_start(vargs, fmt); + dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); + va_end(vargs); + return dev; +} +EXPORT_SYMBOL_GPL(device_create_drvdata); + +/** + * device_create - creates a device and registers it with sysfs + * @class: pointer to the struct class that this device should be registered to + * @parent: pointer to the parent struct device of this new device, if any + * @devt: the dev_t for the char device to be added + * @fmt: string for the device's name + * + * This function can be used by char device classes. A struct device + * will be created in sysfs, registered to the specified class. + * + * A "dev" file will be created, showing the dev_t for the device, if + * the dev_t is not 0,0. + * If a pointer to a parent struct device is passed in, the newly created + * struct device will be a child of that device in sysfs. + * The pointer to the struct 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 device *device_create(struct class *class, struct device *parent, + dev_t devt, const char *fmt, ...) +{ + va_list vargs; + struct device *dev; + + va_start(vargs, fmt); + dev = device_create_vargs(class, parent, devt, NULL, fmt, vargs); + va_end(vargs); + return dev; +} EXPORT_SYMBOL_GPL(device_create); static int __match_devt(struct device *dev, void *data) @@ -1218,13 +1291,11 @@ int device_rename(struct device *dev, char *new_name) } #else if (dev->class) { - sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, dev->bus_id); - if (error) { - dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", - __func__, error); - } + if (error) + goto out; + sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); } #endif |