[ALSA] usb-audio: allow low speed MIDI devices

Allow low speed MIDI devices because newer devices from ESI do not
support full speed.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 9 insertions, 2 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index cbe8b335147c..e1558a6c42d8 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2840,6 +2840,10 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
                         /* skip non-supported classes */
                         continue;
                 }
+                if (snd_usb_get_speed(dev) == USB_SPEED_LOW) {
+                        snd_printk(KERN_ERR "low speed audio streaming not supported\n");
+                        continue;
+                }
                 if (! parse_audio_endpoints(chip, j)) {
                         usb_set_interface(dev, j, 0); /* reset the current interface */
                         usb_driver_claim_interface(&usb_audio_driver, iface, (void *)-1L);
@@ -3382,7 +3386,8 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
 
         *rchip = NULL;
 
-        if (snd_usb_get_speed(dev) != USB_SPEED_FULL &&
+        if (snd_usb_get_speed(dev) != USB_SPEED_LOW &&
+            snd_usb_get_speed(dev) != USB_SPEED_FULL &&
             snd_usb_get_speed(dev) != USB_SPEED_HIGH) {
                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
                 return -ENXIO;
@@ -3456,7 +3461,9 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 
         strlcat(card->longname,
-                snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" : ", high speed",
+                snd_usb_get_speed(dev) == USB_SPEED_LOW ? ", low speed" :
+                snd_usb_get_speed(dev) == USB_SPEED_FULL ? ", full speed" :
+                ", high speed",
                 sizeof(card->longname));
 
         snd_usb_audio_create_proc(chip);