Units of TASCAM FireWire series multiplex PCM frames and state of control surface into the same tx isochronous packets. One isochronous packet includes a part of the state in a quadlet data. An image of the state consists of 64 quadlet data.
This commit demultiplexes the state from tx isochronous packets.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- include/uapi/sound/firewire.h | 2 ++ sound/firewire/tascam/amdtp-tascam.c | 17 ++++++++++++++++- sound/firewire/tascam/tascam.h | 3 +++ 3 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h index f0a547d86679..b9bc4bb1756b 100644 --- a/include/uapi/sound/firewire.h +++ b/include/uapi/sound/firewire.h @@ -88,4 +88,6 @@ struct snd_firewire_get_info { * Returns -EBUSY if the driver is already streaming. */
+#define SNDRV_FIREWIRE_TASCAM_STATE_COUNT 64 + #endif /* _UAPI_SOUND_FIREWIRE_H_INCLUDED */ diff --git a/sound/firewire/tascam/amdtp-tascam.c b/sound/firewire/tascam/amdtp-tascam.c index ab482423c165..516cb931fd5e 100644 --- a/sound/firewire/tascam/amdtp-tascam.c +++ b/sound/firewire/tascam/amdtp-tascam.c @@ -117,6 +117,21 @@ int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s, return amdtp_stream_add_pcm_hw_constraints(s, runtime); }
+static void read_status_messages(struct amdtp_stream *s, + __be32 *buffer, unsigned int data_blocks) +{ + struct snd_tscm *tscm = container_of(s, struct snd_tscm, tx_stream); + int i; + + for (i = 0; i < data_blocks; i++) { + unsigned int index; + + index = be32_to_cpu(buffer[0]) % SNDRV_FIREWIRE_TASCAM_STATE_COUNT; + tscm->state[index] = buffer[s->data_block_quadlets - 1]; + buffer += s->data_block_quadlets; + } +} + static unsigned int process_tx_data_blocks(struct amdtp_stream *s, __be32 *buffer, unsigned int data_blocks, @@ -128,7 +143,7 @@ static unsigned int process_tx_data_blocks(struct amdtp_stream *s, if (data_blocks > 0 && pcm) read_pcm_s32(s, pcm, buffer, data_blocks);
- /* A place holder for control messages. */ + read_status_messages(s, buffer, data_blocks);
return data_blocks; } diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h index a5bd167eb5d9..c710496a99cf 100644 --- a/sound/firewire/tascam/tascam.h +++ b/sound/firewire/tascam/tascam.h @@ -89,6 +89,9 @@ struct snd_tscm {
/* For MIDI message outgoing transactions. */ struct snd_fw_async_midi_port out_ports[TSCM_MIDI_OUT_PORT_MAX]; + + // A cache of status information in tx isoc packets. + __be32 state[SNDRV_FIREWIRE_TASCAM_STATE_COUNT]; };
#define TSCM_ADDR_BASE 0xffff00000000ull