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 ec6201a32aca..76fcb4e995c9 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