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authorDaniel Mack <zonque@gmail.com>2013-04-17 00:01:40 +0800
committerTakashi Iwai <tiwai@suse.de>2013-04-18 10:03:53 +0200
commit126825e7ea271ae8e3172e10ca1fc22c908b5385 (patch)
treeb19bbca378e58874625132b41aaaea1855ec44f6
parent44dcbbb1cd615634c09d1bf31c124332795903a8 (diff)
downloadop-kernel-dev-126825e7ea271ae8e3172e10ca1fc22c908b5385.zip
op-kernel-dev-126825e7ea271ae8e3172e10ca1fc22c908b5385.tar.gz
ALSA: snd-usb: add quirks handler for DSD streams
Unfortunately, none of the UAC standards provides a way to identify DSD (Direct Stream Digital) formats. Hence, this patch adds a quirks handler to identify USB interfaces that are capable of handling DSD. That quirks handler can augment the already parsed formats bit-field, by any of the new SNDRV_PCM_FMTBIT_DSD_{U8_U16} and setting the dsd_dop flag in the audio format, if the driver should take care for the DOP byte stuffing. The only devices that are known to work with this are the ones with a 'Playback Designs' vendor id. Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/usb/format.c3
-rw-r--r--sound/usb/quirks.c28
-rw-r--r--sound/usb/quirks.h4
3 files changed, 35 insertions, 0 deletions
diff --git a/sound/usb/format.c b/sound/usb/format.c
index 20c7751..020ede0 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -136,6 +136,9 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
chip->dev->devnum, fp->iface, fp->altsetting, format);
}
+
+ pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);
+
return pcm_formats;
}
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 175fbb7..e564adb 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -916,3 +916,31 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
mdelay(20);
}
+/*
+ * snd_usb_interface_dsd_format_quirks() is called from format.c to
+ * augment the PCM format bit-field for DSD types. The UAC standards
+ * don't have a designated bit field to denote DSD-capable interfaces,
+ * hence all hardware that is known to support this format has to be
+ * listed here.
+ */
+u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ unsigned int sample_bytes)
+{
+ /* Playback Designs */
+ if (le16_to_cpu(chip->dev->descriptor.idVendor) == 0x23ba) {
+ switch (fp->altsetting) {
+ case 1:
+ fp->dsd_dop = true;
+ return SNDRV_PCM_FMTBIT_DSD_U16_LE;
+ case 2:
+ fp->dsd_bitrev = true;
+ return SNDRV_PCM_FMTBIT_DSD_U8;
+ case 3:
+ fp->dsd_bitrev = true;
+ return SNDRV_PCM_FMTBIT_DSD_U16_LE;
+ }
+ }
+
+ return 0;
+}
diff --git a/sound/usb/quirks.h b/sound/usb/quirks.h
index 7c3681f..665e972 100644
--- a/sound/usb/quirks.h
+++ b/sound/usb/quirks.h
@@ -31,4 +31,8 @@ void snd_usb_ctl_msg_quirk(struct usb_device *dev, unsigned int pipe,
__u8 request, __u8 requesttype, __u16 value,
__u16 index, void *data, __u16 size);
+u64 snd_usb_interface_dsd_format_quirks(struct snd_usb_audio *chip,
+ struct audioformat *fp,
+ unsigned int sample_bytes);
+
#endif /* __USBAUDIO_QUIRKS_H */
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