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>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 4701b6589b10..4ea4920c927a 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1221,6 +1221,17 @@ static int vidioc_g_register(struct file *file, void *priv,
         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 @@ static int vidioc_s_register(struct file *file, void *priv,
         __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);