From 8bb5bafa8057a91613d50f7b0bec025852360237 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 1 May 2012 10:06:40 -0300 Subject: [PATCH] [media] tda9840: fix setting of the audio mode You have to first detect the current rxsubchans (mono, stereo or bilingual), and depending on that you can set the audio mode. It does not automatically switch when the audio channels change. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/tda9840.c | 75 ++++++++++++++++++++--------------- 1 file 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; -- 2.41.0