input: Make the polling interval for mice a configurable parameter

       of the HID driver. This is useful when a faster response
       from a mouse is beneficial, ie games.
Signed-off-by: Mikkel Krautz <krautz@gmail.com>
Signed-off-by: Vojtech Pavlik <vojtech@suse.cz>

Documentation/kernel-parameters.txt

@@ -73,6 +73,7 @@ restrictions referred to are that the relevant option is valid if:
 	SWSUSP	Software suspension is enabled.
 	TS	Appropriate touchscreen support is enabled.
 	USB	USB support is enabled.
+	USBHID	USB Human Interface Device support is enabled.
 	V4L	Video For Linux support is enabled.
 	VGA	The VGA console has been enabled.
 	VT	Virtual terminal support is enabled.
@@ -1396,6 +1397,9 @@ running once the system is up.
 			Format: <io>,<irq>
 
 	usb-handoff	[HW] Enable early USB BIOS -> OS handoff
+
+	usbhid.mousepoll=
+			[USBHID] The interval which mice are to be polled at.
  
 	video=		[FB] Frame buffer configuration
 			See Documentation/fb/modedb.txt.

drivers/usb/input/hid-core.c

@@ -37,13 +37,20 @@
  * Version Information
  */
 
-#define DRIVER_VERSION "v2.0"
+#define DRIVER_VERSION "v2.01"
 #define DRIVER_AUTHOR "Andreas Gal, Vojtech Pavlik"
 #define DRIVER_DESC "USB HID core driver"
 #define DRIVER_LICENSE "GPL"
 
 static char *hid_types[] = {"Device", "Pointer", "Mouse", "Device", "Joystick",
 				"Gamepad", "Keyboard", "Keypad", "Multi-Axis Controller"};
+/*
+ * Module parameters.
+ */
+
+static unsigned int hid_mousepoll_interval;
+module_param_named(mousepoll, hid_mousepoll_interval, uint, 0644);
+MODULE_PARM_DESC(mousepoll, "Polling interval of mice");
 
 /*
  * Register a new report for a device.
@@ -1694,6 +1701,10 @@ static struct hid_device *usb_hid_configure(struct usb_interface *intf)
 		if (dev->speed == USB_SPEED_HIGH)
 			interval = 1 << (interval - 1);
 
+		/* Change the polling interval of mice. */
+		if (hid->collection->usage == HID_GD_MOUSE && hid_mousepoll_interval > 0)
+			interval = hid_mousepoll_interval;
+		
 		if (endpoint->bEndpointAddress & USB_DIR_IN) {
 			if (hid->urbin)
 				continue;