ALSA: ump: Additional proc output

UMP devices may have more interesting information than the traditional
rawmidi.  Extend the rawmidi_global_ops to allow the optional proc
info output and show some more bits in the proc file for UMP.

Note that the "Groups" field shows the first and the last UMP Groups,
and both numbers are 1-based (i.e. the first group is 1).

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-7-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/rawmidi.h

@@ -18,6 +18,7 @@
 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
 #include <sound/seq_device.h>
 #endif
+#include <sound/info.h>
 
 /*
  *  Raw MIDI interface
@@ -49,6 +50,8 @@ struct snd_rawmidi_global_ops {
 			      struct snd_seq_port_info *info);
 	long (*ioctl)(struct snd_rawmidi *rmidi, unsigned int cmd,
 		      void __user *argp);
+	void (*proc_read)(struct snd_info_entry *entry,
+			  struct snd_info_buffer *buf);
 };
 
 struct snd_rawmidi_runtime {