Commit 4dce2f07 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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: default avatarTakashi Iwai <tiwai@suse.de>
parent eacd9c7f

include/sound/ump.h

+1 −0
Original line number Diff line number Diff line
@@ -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

+8 −3
Original line number Diff line number Diff line
@@ -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