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authorTakashi Sakamoto <o-takashi@sakamocchi.jp>2018-11-23 13:13:03 +0900
committerTakashi Iwai <tiwai@suse.de>2018-11-23 15:31:08 +0100
commit33b2e1442aeaacabb4e29f8adb31469e87599b16 (patch)
tree21e65c35bffdf823c29dcd81ade13860d27631aa
parentc12faa2bc56cb1e7a12b49f0b3a935c0c64fd0b4 (diff)
downloadlinux-stericsson-33b2e1442aeaacabb4e29f8adb31469e87599b16.tar.gz
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>
-rw-r--r--include/uapi/sound/firewire.h2
-rw-r--r--sound/firewire/tascam/amdtp-tascam.c17
-rw-r--r--sound/firewire/tascam/tascam.h3
3 files changed, 21 insertions, 1 deletions
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