V4L/DVB (12740): em28xx: better describe vinctrl registers

Properly document the video input control register, in preparation for the
addition of VBI support.  Note this patch makes no functional changes.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-cards.c

@@ -2570,7 +2570,8 @@ static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
 	 * Default format, used for tvp5150 or saa711x output formats
 	 */
 	dev->vinmode = 0x10;
-	dev->vinctl  = 0x11;
+	dev->vinctl  = EM28XX_VINCTRL_INTERLACED |
+		       EM28XX_VINCTRL_CCIR656_ENABLE;
 
 	/* Do board specific init and eeprom reading */
 	em28xx_card_setup(dev);

drivers/media/video/em28xx/em28xx-reg.h

@@ -86,7 +86,19 @@
 #define EM28XX_XCLK_FREQUENCY_24MHZ	0x0b
 
 #define EM28XX_R10_VINMODE	0x10
+
 #define EM28XX_R11_VINCTRL	0x11
+
+/* em28xx Video Input Control Register 0x11 */
+#define EM28XX_VINCTRL_VBI_SLICED	0x80
+#define EM28XX_VINCTRL_VBI_RAW		0x40
+#define EM28XX_VINCTRL_VOUT_MODE_IN	0x20 /* HREF,VREF,VACT in output */
+#define EM28XX_VINCTRL_CCIR656_ENABLE	0x10
+#define EM28XX_VINCTRL_VBI_16BIT_RAW	0x08 /* otherwise 8-bit raw */
+#define EM28XX_VINCTRL_FID_ON_HREF	0x04
+#define EM28XX_VINCTRL_DUAL_EDGE_STROBE	0x02
+#define EM28XX_VINCTRL_INTERLACED	0x01
+
 #define EM28XX_R12_VINENABLE	0x12	/* */
 
 #define EM28XX_R14_GAMMA	0x14