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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2018-11-23 13:13:03 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-11-23 15:31:08 +0100 |
| commit | 33b2e1442aeaacabb4e29f8adb31469e87599b16 (patch) | |
| tree | 21e65c35bffdf823c29dcd81ade13860d27631aa /sound/firewire | |
| parent | c12faa2bc56cb1e7a12b49f0b3a935c0c64fd0b4 (diff) | |
| download | linux-33b2e1442aeaacabb4e29f8adb31469e87599b16.tar.gz linux-33b2e1442aeaacabb4e29f8adb31469e87599b16.tar.bz2 linux-33b2e1442aeaacabb4e29f8adb31469e87599b16.zip | |
ALSA: firewire-tascam: pick up data of state from tx isochronous pakcets
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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire')
| -rw-r--r-- | sound/firewire/tascam/amdtp-tascam.c | 17 | ||||
| -rw-r--r-- | sound/firewire/tascam/tascam.h | 3 |
2 files changed, 19 insertions, 1 deletions
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 |