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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>
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@ -109,6 +109,7 @@ static inline int snd_ump_attach_legacy_rawmidi(struct snd_ump_endpoint *ump,
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}
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#endif
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int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val);
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int snd_ump_switch_protocol(struct snd_ump_endpoint *ump, unsigned int protocol);
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/*
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@ -263,12 +263,16 @@ static unsigned char ump_packet_words[0x10] = {
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1, 1, 1, 2, 2, 4, 1, 1, 2, 2, 2, 3, 3, 4, 4, 4
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};
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/* parse the UMP packet data;
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* the data is copied onto ump->input_buf[].
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/**
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* snd_ump_receive_ump_val - parse the UMP packet data
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* @ump: UMP endpoint
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* @val: UMP packet data
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*
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* The data is copied onto ump->input_buf[].
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* When a full packet is completed, returns the number of words (from 1 to 4).
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* OTOH, if the packet is incomplete, returns 0.
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*/
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static int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
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int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
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{
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int words;
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@ -284,6 +288,7 @@ static int snd_ump_receive_ump_val(struct snd_ump_endpoint *ump, u32 val)
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_ump_receive_ump_val);
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/**
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* snd_ump_receive - transfer UMP packets from the device
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