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ALSA: fireface: add helper function to parse MIDI messages transmitted by Fireface 400

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This is minor code refactoring to add helper function to parse MIDI message
bytes in quadlet message.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230112120954.500692-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2023-01-12 21:09:51 +09:00 committed by Takashi Iwai
parent 4bdcb8d28f
commit aed713bfae
1 changed files with 20 additions and 27 deletions
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47
sound/firewire/fireface/ff-protocol-former.c
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@ -534,6 +534,22 @@ static void ff400_finish_session(struct snd_ff *ff)
FF400_ISOC_COMM_STOP, &reg, sizeof(reg), 0);
}
static void parse_midi_msg(struct snd_ff *ff, u32 quad, unsigned int port)
{
struct snd_rawmidi_substream *substream = READ_ONCE(ff->tx_midi_substreams[port]);
if (substream != NULL) {
u8 byte = (quad >> (16 * port)) & 0x000000ff;
snd_rawmidi_receive(substream, &byte, 1);
}
}
#define FF400_MSG_FLAG_IS_MIDI_PORT_0 0x00000100
#define FF400_MSG_MASK_MIDI_PORT_0 0x000000ff
#define FF400_MSG_FLAG_IS_MIDI_PORT_1 0x01000000
#define FF400_MSG_MASK_MIDI_PORT_1 0x00ff0000
// For Fireface 400, lower 4 bytes of destination address is configured by bit
// flag in quadlet register (little endian) at 0x'0000'801'0051c. Drivers can
// select one of 4 options:
@ -560,34 +576,11 @@ static void ff400_handle_msg(struct snd_ff *ff, unsigned int offset, const __le3
for (i = 0; i < length / 4; i++) {
u32 quad = le32_to_cpu(buf[i]);
u8 byte;
unsigned int index;
struct snd_rawmidi_substream *substream;
/* Message in first port. */
/*
* This value may represent the index of this unit when the same
* units are on the same IEEE 1394 bus. This driver doesn't use
* it.
*/
index = (quad >> 8) & 0xff;
if (index > 0) {
substream = READ_ONCE(ff->tx_midi_substreams[0]);
if (substream != NULL) {
byte = quad & 0xff;
snd_rawmidi_receive(substream, &byte, 1);
}
}
/* Message in second port. */
index = (quad >> 24) & 0xff;
if (index > 0) {
substream = READ_ONCE(ff->tx_midi_substreams[1]);
if (substream != NULL) {
byte = (quad >> 16) & 0xff;
snd_rawmidi_receive(substream, &byte, 1);
}
}
if (quad & FF400_MSG_FLAG_IS_MIDI_PORT_0)
parse_midi_msg(ff, quad, 0);
else if (quad & FF400_MSG_FLAG_IS_MIDI_PORT_1)
parse_midi_msg(ff, quad, 1);
}
}