sound: usb-audio: add workaround for Blue Microphones devices

Blue Microphones USB devices have an alternate setting that sends two
channels of data to the computer.  Unfortunately, the descriptors of
that altsetting have a wrong channel setting, which means that any
recorded data from such a device has twice the sample rate from what
would be expected.

This patch adds a workaround to ignore that altsetting.  Since these
devices have only one actual channel, no data is lost.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index c7b902358b7b..44b9cdc8a83b 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2661,7 +2661,7 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
         struct usb_interface_descriptor *altsd;
         int i, altno, err, stream;
         int format;
-        struct audioformat *fp;
+        struct audioformat *fp = NULL;
         unsigned char *fmt, *csep;
         int num;
 
@@ -2734,6 +2734,18 @@ static int parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
                         continue;
                 }
 
+                /*
+                 * Blue Microphones workaround: The last altsetting is identical
+                 * with the previous one, except for a larger packet size, but
+                 * is actually a mislabeled two-channel setting; ignore it.
+                 */
+                if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
+                    fp && fp->altsetting == 1 && fp->channels == 1 &&
+                    fp->format == SNDRV_PCM_FORMAT_S16_LE &&
+                    le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
+                                                        fp->maxpacksize * 2)
+                        continue;
+
                 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
                 /* Creamware Noah has this descriptor after the 2nd endpoint */
                 if (!csep && altsd->bNumEndpoints >= 2)