V4L/DVB: gspca_main: Allow use of input device creation code for non int. inputs

Allow use of the gspca core input device creation code by subdrivers which
have non interrupt driven camera buttons.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/gspca.c

@@ -158,7 +158,7 @@ static int gspca_input_connect(struct gspca_dev *dev)
 	int err = 0;
 
 	dev->input_dev = NULL;
-	if (dev->sd_desc->int_pkt_scan)  {
+	if (dev->sd_desc->int_pkt_scan || dev->sd_desc->other_input)  {
 		input_dev = input_allocate_device();
 		if (!input_dev)
 			return -ENOMEM;

drivers/media/video/gspca/gspca.h

@@ -131,6 +131,9 @@ struct sd_desc {
 	cam_ident_op get_chip_ident;
 #ifdef CONFIG_INPUT
 	cam_int_pkt_op int_pkt_scan;
+	/* other_input makes the gspca core create gspca_dev->input even when
+	   int_pkt_scan is NULL, for cams with non interrupt driven buttons */
+	u8 other_input;
 #endif
 };