ALSA: ump: Export snd_ump_receive_ump_val()

This is another preliminary patch for USB MIDI 2.0 gadget driver.
Export the currently local snd_ump_receive_ump_val().  It can be used
by the gadget driver for processing the UMP data.

Link: https://lore.kernel.org/r/20230621110241.4751-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: tiwai

include/sound/ump.h

@@ -109,6 +109,7 @@ static inline int snd_ump_attach_legacy_rawmidi(struct snd_ump_endpoint *ump,
 }
 #endif
 
+int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val);
 int snd_ump_switch_protocol(struct snd_ump_endpoint *ump, unsigned int protocol);
 
 /*

sound/core/ump.c

@@ -263,12 +263,16 @@ static unsigned char ump_packet_words[0x10] = {
 	1, 1, 1, 2, 2, 4, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4
 };
 
-/* parse the UMP packet data;
- * the data is copied onto ump->input_buf[].
+/**
+ * snd_ump_receive_ump_val - parse the UMP packet data
+ * @ump: UMP endpoint
+ * @val: UMP packet data
+ *
+ * The data is copied onto ump->input_buf[].
  * When a full packet is completed, returns the number of words (from 1 to 4).
  * OTOH, if the packet is incomplete, returns 0.
  */
-static int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
+int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
 {
 	int words;
 
@@ -284,6 +288,7 @@ static int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
 	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(snd_ump_receive_ump_val);
 
 /**
  * snd_ump_receive - transfer UMP packets from the device