V4L/DVB (3293): Added digital support for cx88 (cx88-alsa)

- This module is co-authored by  Ricardo Cerqueira <v4l@cerqueira.org>.

- Added digital audio support for cx88-based boards that have function
  01 enabled. These boards can be identified by having PCI id 1471:8801
  or 1471:8811.

- Increased DMA buffer from 512 to 4096 seems to fix audio distortion.

- Existing audio DMA uses conflict with cx88-alsa. Should be disabled when
  cx88-alsa module is compiled.

Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/media/video/cx88/Kconfig b/drivers/media/video/cx88/Kconfig
index ec6201a..76fcb4e 100644
--- a/drivers/media/video/cx88/Kconfig
+++ b/drivers/media/video/cx88/Kconfig
@@ -29,6 +29,21 @@ config VIDEO_CX88_DVB
 	  You must also select one or more DVB/ATSC demodulators.
 	  If you are unsure which you need, choose all of them.
 
+config VIDEO_CX88_ALSA
+	tristate "ALSA DMA audio support"
+	depends on VIDEO_CX88 && SND
+	select SND_PCM_OSS
+	---help---
+	  This is a video4linux driver for direct (DMA) audio on
+	  Conexant 2388x based TV cards.
+	  It only works with boards with function 01 enabled.
+	  To check if your board supports, use lspci -n.
+	  If supported, you should see 1471:8801 or 1471:8811
+	  PCI device.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cx88-alsa.
+
 config VIDEO_CX88_DVB_ALL_FRONTENDS
 	bool "Build all supported frontends for cx2388x based TV cards"
 	default y