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Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c109
1 files changed, 98 insertions, 11 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index be288b5e418..ee0a51a3a41 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -760,6 +760,22 @@ static void device_remove_class_symlinks(struct device *dev)
}
/**
+ * dev_set_name - set a device name
+ * @dev: device
+ * @fmt: format string for the device's name
+ */
+int dev_set_name(struct device *dev, const char *fmt, ...)
+{
+ va_list vargs;
+
+ va_start(vargs, fmt);
+ vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
+ va_end(vargs);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dev_set_name);
+
+/**
* device_add - add device to device hierarchy.
* @dev: device.
*
@@ -1084,11 +1100,13 @@ 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 +1122,10 @@ 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 +1142,9 @@ 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 +1155,78 @@ 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 +1307,11 @@ 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