V4L/DVB (9953): em28xx: Add suport for debugging AC97 anciliary chips
The em28xx driver can be coupled to an anciliary AC97 chip. This patch
allows read/write AC97 registers directly.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 4701b65..4ea4920 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1221,6 +1221,17 @@
struct em28xx *dev = fh->dev;
int ret;
+ if (reg->match_type == V4L2_CHIP_MATCH_AC97) {
+ mutex_lock(&dev->lock);
+ ret = em28xx_read_ac97(dev, reg->reg);
+ mutex_unlock(&dev->lock);
+ if (ret < 0)
+ return ret;
+
+ reg->val = ret;
+ return 0;
+ }
+
if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
return -EINVAL;
@@ -1256,6 +1267,14 @@
__le64 buf;
int rc;
+ if (reg->match_type == V4L2_CHIP_MATCH_AC97) {
+ mutex_lock(&dev->lock);
+ rc = em28xx_write_ac97(dev, reg->reg, reg->val);
+ mutex_unlock(&dev->lock);
+
+ return rc;
+ }
+
buf = cpu_to_le64(reg->val);
mutex_lock(&dev->lock);