Update of /cvsroot/alsa/alsa-kernel/usb
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv3069/alsa-kernel/usb
Modified Files:
usbmidi.c
Log Message:
add comments in USB MIDI vendor-specific detection functions
Index: usbmidi.c
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/usb/usbmidi.c,v
retrieving revision 1.26
retrieving revision 1.27
diff -u -r1.26 -r1.27
--- usbmidi.c 16 Mar 2004 16:36:05 -0000 1.26
+++ usbmidi.c 17 Mar 2004 13:10:55 -0000 1.27
@@ -1015,6 +1015,10 @@
if (intfd->bNumEndpoints < 1)
return -ENOENT;
+ /*
+ * For each port there is one MIDI_IN/OUT_JACK descriptor, not
+ * necessarily with any useful contents. So simply count 'em.
+ */
for (cs_desc = hostif->extra;
cs_desc < hostif->extra + hostif->extralen && cs_desc[0] >= 2;
cs_desc += cs_desc[0]) {
@@ -1049,6 +1053,16 @@
return -ENOENT;
hostif = intf->altsetting;
intfd = get_iface_desc(hostif);
+ /*
+ * The various MidiSport devices have more or less random endpoint
+ * numbers, so we have to identify the endpoints by their index in
+ * the descriptor array, like the driver for that other OS does.
+ *
+ * There is one interrupt input endpoint for all input ports, one
+ * bulk output endpoint for even-numbered ports, and one for odd-
+ * numbered ports. Both bulk output endpoints have corresponding
+ * input bulk endpoints (at indices 1 and 3) which aren't used.
+ */
if (intfd->bNumEndpoints < (endpoint->out_cables > 0x0001 ? 5 : 3)) {
snd_printdd(KERN_ERR "not enough endpoints\n");
return -ENOENT;
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