From: Fabio Estevam fabio.estevam@freescale.com

On a mx28 board, running "aplay -l" and "arecord -l" results in the following:

$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: mxssgtl5000 [mxs_sgtl5000], device 0: Playback sgtl5000-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: mxssgtl5000 [mxs_sgtl5000], device 1: Capture sgtl5000-1 [] Subdevices: 1/1 Subdevice #0: subdevice #0

$ arecord -l **** List of CAPTURE Hardware Devices **** card 0: mxssgtl5000 [mxs_sgtl5000], device 0: Playback sgtl5000-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: mxssgtl5000 [mxs_sgtl5000], device 1: Capture sgtl5000-1 [] Subdevices: 1/1 Subdevice #0: subdevice #0

,which is not correct because we got a capture device listed in aplay and a playback device listed in arecord.

On mx28 there are two serial audio interface ports (SAIF0 and SAIF1) and each one of them are unidirectional.

Allow to specify a dai link as 'playback_only' or 'capture_only', which suits well for this case.

After this change we can correctly report the capabilities as follows:

$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: mxssgtl5000 [mxs_sgtl5000], device 0: HiFi Playback sgtl5000-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0

$ arecord -l **** List of CAPTURE Hardware Devices **** card 0: mxssgtl5000 [mxs_sgtl5000], device 1: HiFi Capture sgtl5000-1 [] Subdevices: 1/1 Subdevice #0: subdevice #0

Also tested playback and capture on the mx28evk board.

Signed-off-by: Fabio Estevam fabio.estevam@freescale.com ---

After I get some feedback, I can split the patch in two parts (one for soc-pcm and another one for mxs-sgtl5000).

include/sound/soc.h | 4 ++++ sound/soc/mxs/mxs-sgtl5000.c | 2 ++ sound/soc/soc-pcm.c | 10 ++++++++++ 3 files changed, 16 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h index 8e2ad52..774d3be 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -934,6 +934,10 @@ struct snd_soc_dai_link { /* machine stream operations */ const struct snd_soc_ops *ops; const struct snd_soc_compr_ops *compr_ops; + + /* For unidirectional dai links */ + bool playback_only; + bool capture_only; };

struct snd_soc_codec_conf { diff --git a/sound/soc/mxs/mxs-sgtl5000.c b/sound/soc/mxs/mxs-sgtl5000.c index ce084eb..4bb2737 100644 --- a/sound/soc/mxs/mxs-sgtl5000.c +++ b/sound/soc/mxs/mxs-sgtl5000.c @@ -105,11 +105,13 @@ static struct snd_soc_dai_link mxs_sgtl5000_dai[] = { .stream_name = "HiFi Playback", .codec_dai_name = "sgtl5000", .ops = &mxs_sgtl5000_hifi_ops, + .playback_only = true, }, { .name = "HiFi Rx", .stream_name = "HiFi Capture", .codec_dai_name = "sgtl5000", .ops = &mxs_sgtl5000_hifi_ops, + .capture_only = true, }, };

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index fb70fbe..5e44863 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -2020,6 +2020,16 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num) capture = 1; }

+ if (rtd->dai_link->playback_only) { + playback = 1; + capture = 0; + } + + if (rtd->dai_link->capture_only) { + playback = 0; + capture = 1; + } + /* create the PCM */ if (rtd->dai_link->no_pcm) { snprintf(new_name, sizeof(new_name), "(%s)",