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path: root/drivers/media/video/tda9840.c
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Diffstat (limited to 'drivers/media/video/tda9840.c')
-rw-r--r--drivers/media/video/tda9840.c75
1 files changed, 44 insertions, 31 deletions
diff --git a/drivers/media/video/tda9840.c b/drivers/media/video/tda9840.c
index 465d7086bab..3d7ddd93282 100644
--- a/drivers/media/video/tda9840.c
+++ b/drivers/media/video/tda9840.c
@@ -66,29 +66,53 @@ static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
val, reg);
}
+static int tda9840_status(struct v4l2_subdev *sd)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ u8 byte;
+
+ if (1 != i2c_master_recv(client, &byte, 1)) {
+ v4l2_dbg(1, debug, sd,
+ "i2c_master_recv() failed\n");
+ return -EIO;
+ }
+
+ if (byte & 0x80) {
+ v4l2_dbg(1, debug, sd,
+ "TDA9840_DETECT: register contents invalid\n");
+ return -EINVAL;
+ }
+
+ v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
+ return byte & 0x60;
+}
+
static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
{
+ int stat = tda9840_status(sd);
int byte;
if (t->index)
return -EINVAL;
- switch (t->audmode) {
- case V4L2_TUNER_MODE_STEREO:
- byte = TDA9840_SET_STEREO;
- break;
- case V4L2_TUNER_MODE_LANG1_LANG2:
- byte = TDA9840_SET_BOTH;
- break;
- case V4L2_TUNER_MODE_LANG1:
- byte = TDA9840_SET_LANG1;
- break;
- case V4L2_TUNER_MODE_LANG2:
- byte = TDA9840_SET_LANG2;
- break;
- default:
+ stat = stat < 0 ? 0 : stat;
+ if (stat == 0 || stat == 0x60) /* mono input */
byte = TDA9840_SET_MONO;
- break;
+ else if (stat == 0x40) /* stereo input */
+ byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
+ TDA9840_SET_MONO : TDA9840_SET_STEREO;
+ else { /* bilingual */
+ switch (t->audmode) {
+ case V4L2_TUNER_MODE_LANG1_LANG2:
+ byte = TDA9840_SET_BOTH;
+ break;
+ case V4L2_TUNER_MODE_LANG2:
+ byte = TDA9840_SET_LANG2;
+ break;
+ default:
+ byte = TDA9840_SET_LANG1;
+ break;
+ }
}
v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
tda9840_write(sd, SWITCH, byte);
@@ -97,25 +121,14 @@ static int tda9840_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
{
- struct i2c_client *client = v4l2_get_subdevdata(sd);
- u8 byte;
-
- t->rxsubchans = V4L2_TUNER_SUB_MONO;
- if (1 != i2c_master_recv(client, &byte, 1)) {
- v4l2_dbg(1, debug, sd,
- "i2c_master_recv() failed\n");
- return -EIO;
- }
+ int stat = tda9840_status(sd);
- if (byte & 0x80) {
- v4l2_dbg(1, debug, sd,
- "TDA9840_DETECT: register contents invalid\n");
- return -EINVAL;
- }
+ if (stat < 0)
+ return stat;
- v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
+ t->rxsubchans = V4L2_TUNER_SUB_MONO;
- switch (byte & 0x60) {
+ switch (stat & 0x60) {
case 0x00:
t->rxsubchans = V4L2_TUNER_SUB_MONO;
break;