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ALSA: ump: Export snd_ump_receive_ump_val()

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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>
This commit is contained in:
Takashi Iwai 2023-06-21 13:02:41 +02:00
parent eacd9c7f1d
commit 4dce2f076b
2 changed files with 9 additions and 3 deletions
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1
include/sound/ump.h
View File

@ -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);
/*

11
sound/core/ump.c
View File

@ -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