[media] media: Support Intersil/Techwell TW686x-based video capture cards

This commit introduces the support for the Techwell TW686x video
capture IC. This hardware supports a few DMA modes, including
scatter-gather and frame (contiguous).

This commit makes little use of the DMA engine and instead has
a memcpy based implementation. DMA frame and scatter-gather modes
support may be added in the future.

Currently supported chips:
- TW6864 (4 video channels),
- TW6865 (4 video channels, not tested, second generation chip),
- TW6868 (8 video channels but only 4 first channels using
           built-in video decoder are supported, not tested),
- TW6869 (8 video channels, second generation chip).

[mchehab@osg.samsung.com: make checkpatch happy by using "unsigned int"
  instead  of just "unsigned"]
Cc: Krzysztof Halasa <khalasa@piap.pl>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 2ec50793c3ba..bfcb7ea42e20 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11258,6 +11258,14 @@ W:	https://linuxtv.org
 S:      Odd Fixes
 F:      drivers/media/pci/tw68/
 
+TW686X VIDEO4LINUX DRIVER
+M:      Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+L:      linux-media@vger.kernel.org
+T:      git git://linuxtv.org/media_tree.git
+W:      http://linuxtv.org
+S:      Maintained
+F:      drivers/media/pci/tw686x/
+
 TPM DEVICE DRIVER
 M:      Peter Huewe <peterhuewe@gmx.de>
 M:      Marcel Selhorst <tpmdd@selhorst.net>