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ALSA: usb-audio: Expose sample resolution through proc interface

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At least some USB devices use (MSB-aligned) audio format larger
than the actual resolution of the device. In order to expose the
actual device resolution (bBitResolution), add extra field to the
procfs stream info interface.

Signed-off-by: Jussi Laako <jussi@sonarnerd.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jussi Laako
2019-02-18 00:17:21 +02:00
committed by Takashi Iwai
parent a06702ca02
commit c7a1326491
3 changed files with 4 additions and 0 deletions
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2
sound/usb/format.c
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@@ -87,6 +87,8 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
}
}
fp->fmt_bits = sample_width;
if ((pcm_formats == 0) &&
(format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
/* some devices don't define this correctly... */