[media] tw2804: add support for the Techwell tw2804

This is based on the wis-tw2804.c driver that's part of the go7007 driver.
It has been converted to a v4l subdev driver by Volokh Konstantin, and I
made additional cleanups.
Based on work by: Volokh Konstantin <volokh84@gmail.com>

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/Kconfig

@@ -301,11 +301,20 @@ config VIDEO_TVP7002
 	  To compile this driver as a module, choose M here: the
 	  module will be called tvp7002.
 
+config VIDEO_TW2804
+	tristate "Techwell TW2804 multiple video decoder"
+	depends on VIDEO_V4L2 && I2C
+	---help---
+	  Support for the Techwell tw2804 multiple video decoder.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called tw2804.
+
 config VIDEO_TW9903
 	tristate "Techwell TW9903 video decoder"
 	depends on VIDEO_V4L2 && I2C
 	---help---
-	  Support for the Techwell 9903 multi-standard video decoder
+	  Support for the Techwell tw9903 multi-standard video decoder
 	  with high quality down scaler.
 
 	  To compile this driver as a module, choose M here: the

drivers/media/i2c/Makefile

@@ -37,6 +37,7 @@ obj-$(CONFIG_VIDEO_THS7303) += ths7303.o
 obj-$(CONFIG_VIDEO_TVP5150) += tvp5150.o
 obj-$(CONFIG_VIDEO_TVP514X) += tvp514x.o
 obj-$(CONFIG_VIDEO_TVP7002) += tvp7002.o
+obj-$(CONFIG_VIDEO_TW2804) += tw2804.o
 obj-$(CONFIG_VIDEO_TW9903) += tw9903.o
 obj-$(CONFIG_VIDEO_CS5345) += cs5345.o
 obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o