[alsa-devel] [PATCH 2/6] ALSA: fireface: add model-dependent parameter for address range to receive async transaction

[Takashi Sakamoto]

In Fireface series, drivers can register destination address for
asynchronous transaction which transfers MIDI messages from device.

In former models, all of the transactions arrive at the registered
address without any offset. In latter models, each of the transaction
arrives at the registered address with sequential offset within 0x00
to 0x7f. This seems to be for discontinuity detection.

This commit adds model-dependent member for the address range.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 sound/firewire/fireface/ff-transaction.c | 2 +-
 sound/firewire/fireface/ff.c             | 2 ++
 sound/firewire/fireface/ff.h             | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/firewire/fireface/ff-transaction.c b/sound/firewire/fireface/ff-transaction.c
index d3fde813ce17..0506755891ce 100644
--- a/sound/firewire/fireface/ff-transaction.c
+++ b/sound/firewire/fireface/ff-transaction.c
@@ -156,7 +156,7 @@ static int allocate_own_address(struct snd_ff *ff, int i)
 	struct fw_address_region midi_msg_region;
 	int err;
 
-	ff->async_handler.length = SND_FF_MAXIMIM_MIDI_QUADS * 4;
+	ff->async_handler.length = ff->spec->midi_addr_range;
 	ff->async_handler.address_callback = handle_midi_msg;
 	ff->async_handler.callback_data = ff;
 
diff --git a/sound/firewire/fireface/ff.c b/sound/firewire/fireface/ff.c
index fd9c980e3cf4..c09a4875aa86 100644
--- a/sound/firewire/fireface/ff.c
+++ b/sound/firewire/fireface/ff.c
@@ -159,6 +159,7 @@ static const struct snd_ff_spec spec_ff800 = {
 	.midi_out_ports = 1,
 	.protocol = &snd_ff_protocol_ff800,
 	.midi_high_addr = 0x000200000320ull,
+	.midi_addr_range = 12,
 };
 
 static const struct snd_ff_spec spec_ff400 = {
@@ -169,6 +170,7 @@ static const struct snd_ff_spec spec_ff400 = {
 	.midi_out_ports = 2,
 	.protocol = &snd_ff_protocol_ff400,
 	.midi_high_addr = 0x0000801003f4ull,
+	.midi_addr_range = SND_FF_MAXIMIM_MIDI_QUADS * 4,
 };
 
 static const struct snd_ff_spec spec_ucx = {
diff --git a/sound/firewire/fireface/ff.h b/sound/firewire/fireface/ff.h
index ddcffb8d85c6..b86ca4fb7d9b 100644
--- a/sound/firewire/fireface/ff.h
+++ b/sound/firewire/fireface/ff.h
@@ -54,6 +54,7 @@ struct snd_ff_spec {
 
 	const struct snd_ff_protocol *protocol;
 	u64 midi_high_addr;
+	u8 midi_addr_range;
 };
 
 struct snd_ff {
-- 
2.19.1