ALSA: snd-usb: handle raw data format of UAC2 devices
UAC2 compliant audio devices may announce the capability to transport
raw audio data on their endpoints. Catch this and handle it as
'special' stream on the ALSA side.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Reported-by: Andreas Koch <andreas@akdesigninc.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/format.c b/sound/usb/format.c
index b30d6fb..a695caf 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -47,7 +47,7 @@
int protocol)
{
int sample_width, sample_bytes;
- u64 pcm_formats;
+ u64 pcm_formats = 0;
switch (protocol) {
case UAC_VERSION_1:
@@ -63,14 +63,17 @@
struct uac_format_type_i_ext_descriptor *fmt = _fmt;
sample_width = fmt->bBitResolution;
sample_bytes = fmt->bSubslotSize;
+
+ if (format & UAC2_FORMAT_TYPE_I_RAW_DATA)
+ pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
+
format <<= 1;
break;
}
}
- pcm_formats = 0;
-
- if (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
+ if ((pcm_formats == 0) &&
+ (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
/* some devices don't define this correctly... */
snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
chip->dev->devnum, fp->iface, fp->altsetting);