V4L/DVB (9921): em28xx: add chip id for em2874

Add the em2870 to the list of known em28xx chip ids.
Signed-off-by: Devin Heitmueller <dheitmueller@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

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

@@ -1409,6 +1409,10 @@ void em28xx_pre_card_setup(struct em28xx *dev)
 		case CHIP_ID_EM2860:
 			em28xx_info("chip ID is em2860\n");
 			break;
+		case CHIP_ID_EM2870:
+			em28xx_info("chip ID is em2870\n");
+			dev->wait_after_write = 0;
+			break;
 		case CHIP_ID_EM2874:
 			em28xx_info("chip ID is em2874\n");
 			dev->reg_gpio_num = EM2874_R80_GPIO;

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

@@ -151,6 +151,7 @@ enum em28xx_chip_id {
 	CHIP_ID_EM2840 = 20,
 	CHIP_ID_EM2750 = 33,
 	CHIP_ID_EM2860 = 34,
+	CHIP_ID_EM2870 = 35,
 	CHIP_ID_EM2883 = 36,
 	CHIP_ID_EM2874 = 65,
 };