V4L/DVB (10242): pwc: add support for webcam snapshot button

This patch adds support for Philips webcam snapshot button as an
event input device, for consistency with other webcam drivers.

Signed-off-by: Pham Thanh Nam <phamthanhnam.ptn@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/pwc/pwc.h

@@ -37,6 +37,9 @@
 #include <linux/videodev.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.h>
+#ifdef CONFIG_USB_PWC_INPUT_EVDEV
+#include <linux/input.h>
+#endif
 
 #include "pwc-uncompress.h"
 #include <media/pwc-ioctl.h>
@@ -255,6 +258,9 @@ struct pwc_device
    int pan_angle;			/* in degrees * 100 */
    int tilt_angle;			/* absolute angle; 0,0 is home position */
    int snapshot_button_status;		/* set to 1 when the user push the button, reset to 0 when this value is read */
+#ifdef CONFIG_USB_PWC_INPUT_EVDEV
+   struct input_dev *button_dev;	/* webcam snapshot button input */
+#endif
 
    /*** Misc. data ***/
    wait_queue_head_t frameq;		/* When waiting for a frame to finish... */