HID: hiddev: reallocate hiddev's minor number

We need to store the minor number each drivers. In case of hidraw, the
minor number is stored stores in struct hidraw. But hiddev's minor is
located in struct hid_device.

The hid-core driver announces a kernel message which driver is loaded when
HID device connected, but hiddev's minor number is always zero. To proper
display hiddev's minor number, we need to store the minor number asked from
usb core and do some refactoring work (move from hiddev.c to hiddev.h) to
access hiddev in hid-core.

[jkosina@suse.cz: rebase on top of newer codebase]
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jaejoong Kim <climbbb.kim@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-core.c

@@ -1695,7 +1695,7 @@ int hid_connect(struct hid_device *hdev, unsigned int connect_mask)
 		len += sprintf(buf + len, "input");
 	if (hdev->claimed & HID_CLAIMED_HIDDEV)
 		len += sprintf(buf + len, "%shiddev%d", len ? "," : "",
-				hdev->minor);
+				((struct hiddev *)hdev->hiddev)->minor);
 	if (hdev->claimed & HID_CLAIMED_HIDRAW)
 		len += sprintf(buf + len, "%shidraw%d", len ? "," : "",
 				((struct hidraw *)hdev->hidraw)->minor);

drivers/hid/usbhid/hiddev.c

@@ -46,17 +46,6 @@
 #endif
 #define HIDDEV_BUFFER_SIZE	2048
 
-struct hiddev {
-	int exist;
-	int open;
-	struct mutex existancelock;
-	wait_queue_head_t wait;
-	struct hid_device *hid;
-	struct list_head list;
-	spinlock_t list_lock;
-	bool initialized;
-};
-
 struct hiddev_list {
 	struct hiddev_usage_ref buffer[HIDDEV_BUFFER_SIZE];
 	int head;
@@ -923,6 +912,8 @@ int hiddev_connect(struct hid_device *hid, unsigned int force)
 	 */
 	hiddev->initialized = hid->quirks & HID_QUIRK_NO_INIT_REPORTS;
 
+	hiddev->minor = usbhid->intf->minor;
+
 	return 0;
 }
 

include/linux/hid.h

@@ -541,7 +541,6 @@ struct hid_device {							/* device report descriptor */
 	struct list_head inputs;					/* The list of inputs */
 	void *hiddev;							/* The hiddev structure */
 	void *hidraw;
-	int minor;							/* Hiddev minor number */
 
 	int open;							/* is the device open by anyone? */
 	char name[128];							/* Device name */

include/linux/hiddev.h

@@ -32,6 +32,18 @@
  * In-kernel definitions.
  */
 
+struct hiddev {
+	int minor;
+	int exist;
+	int open;
+	struct mutex existancelock;
+	wait_queue_head_t wait;
+	struct hid_device *hid;
+	struct list_head list;
+	spinlock_t list_lock;
+	bool initialized;
+};
+
 struct hid_device;
 struct hid_usage;
 struct hid_field;