ALSA: usb: USB3 SuperSpeed sound support

This is V2 of the patch, after feedback from Clemens and Daniel.

This patch adds SuperSpeed support to the USB drivers under sound/. It adds
tests for USB_SPEED_SUPER to the appropriate places that check for the USB
speed.

This patch has been tested with our SS USB3 device emulating a set of Yamaha
speakers and a Logitech microphone, but with the descriptors modified to add
USB3 support. It has also been tested with the real speakers and microphone,
to make sure that USB2 devices still work.

Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Daniel Mack <daniel@caiaq.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 23 insertions, 8 deletions

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 9feb00c831a0..498a2d8fa4bb 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -299,9 +299,13 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
 
         *rchip = NULL;
 
-        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) {
+        switch (snd_usb_get_speed(dev)) {
+        case USB_SPEED_LOW:
+        case USB_SPEED_FULL:
+        case USB_SPEED_HIGH:
+        case USB_SPEED_SUPER:
+                break;
+        default:
                 snd_printk(KERN_ERR "unknown device speed %d\n", snd_usb_get_speed(dev));
                 return -ENXIO;
         }
@@ -377,11 +381,22 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
         if (len < sizeof(card->longname))
                 usb_make_path(dev, card->longname + len, sizeof(card->longname) - len);
 
-        strlcat(card->longname,
-                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));
+        switch (snd_usb_get_speed(dev)) {
+        case USB_SPEED_LOW:
+                strlcat(card->longname, ", low speed", sizeof(card->longname));
+                break;
+        case USB_SPEED_FULL:
+                strlcat(card->longname, ", full speed", sizeof(card->longname));
+                break;
+        case USB_SPEED_HIGH:
+                strlcat(card->longname, ", high speed", sizeof(card->longname));
+                break;
+        case USB_SPEED_SUPER:
+                strlcat(card->longname, ", super speed", sizeof(card->longname));
+                break;
+        default:
+                break;
+        }
 
         snd_usb_audio_create_proc(chip);