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ALSA: firewire-tascam: pick up data of state from tx isochronous pakcets

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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>
This commit is contained in:
Takashi Sakamoto 2018-11-23 13:13:03 +09:00 committed by Takashi Iwai
parent c12faa2bc5
commit 33b2e1442a
3 changed files with 21 additions and 1 deletions
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2
include/uapi/sound/firewire.h
View File

@ -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 */

17
sound/firewire/tascam/amdtp-tascam.c
View File

@ -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;
}

3
sound/firewire/tascam/tascam.h
View File

@ -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