[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>

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index cbe8b33..e1558a6 100644 (file)
--- 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);