linux/sound/firewire/fireworks/fireworks_stream.c

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/*
* fireworks_stream.c - a part of driver for Fireworks based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "./fireworks.h"
#define CALLBACK_TIMEOUT 100
static int
init_stream(struct snd_efw *efw, struct amdtp_stream *stream)
{
struct cmp_connection *conn;
enum cmp_direction c_dir;
enum amdtp_stream_direction s_dir;
int err;
if (stream == &efw->tx_stream) {
conn = &efw->out_conn;
c_dir = CMP_OUTPUT;
s_dir = AMDTP_IN_STREAM;
} else {
conn = &efw->in_conn;
c_dir = CMP_INPUT;
s_dir = AMDTP_OUT_STREAM;
}
err = cmp_connection_init(conn, efw->unit, c_dir, 0);
if (err < 0)
goto end;
err = amdtp_stream_init(stream, efw->unit, s_dir, CIP_BLOCKING);
if (err < 0) {
amdtp_stream_destroy(stream);
cmp_connection_destroy(conn);
}
end:
return err;
}
static void
stop_stream(struct snd_efw *efw, struct amdtp_stream *stream)
{
amdtp_stream_pcm_abort(stream);
amdtp_stream_stop(stream);
if (stream == &efw->tx_stream)
cmp_connection_break(&efw->out_conn);
else
cmp_connection_break(&efw->in_conn);
}
static int
start_stream(struct snd_efw *efw, struct amdtp_stream *stream,
unsigned int sampling_rate)
{
struct cmp_connection *conn;
unsigned int mode, pcm_channels, midi_ports;
int err;
err = snd_efw_get_multiplier_mode(sampling_rate, &mode);
if (err < 0)
goto end;
if (stream == &efw->tx_stream) {
conn = &efw->out_conn;
pcm_channels = efw->pcm_capture_channels[mode];
midi_ports = efw->midi_out_ports;
} else {
conn = &efw->in_conn;
pcm_channels = efw->pcm_playback_channels[mode];
midi_ports = efw->midi_in_ports;
}
amdtp_stream_set_parameters(stream, sampling_rate,
pcm_channels, midi_ports);
/* establish connection via CMP */
err = cmp_connection_establish(conn,
amdtp_stream_get_max_payload(stream));
if (err < 0)
goto end;
/* start amdtp stream */
err = amdtp_stream_start(stream,
conn->resources.channel,
conn->speed);
if (err < 0) {
stop_stream(efw, stream);
goto end;
}
/* wait first callback */
if (!amdtp_stream_wait_callback(stream, CALLBACK_TIMEOUT)) {
stop_stream(efw, stream);
err = -ETIMEDOUT;
}
end:
return err;
}
static void
destroy_stream(struct snd_efw *efw, struct amdtp_stream *stream)
{
stop_stream(efw, stream);
amdtp_stream_destroy(stream);
if (stream == &efw->tx_stream)
cmp_connection_destroy(&efw->out_conn);
else
cmp_connection_destroy(&efw->in_conn);
}
static int
get_sync_mode(struct snd_efw *efw, enum cip_flags *sync_mode)
{
enum snd_efw_clock_source clock_source;
int err;
err = snd_efw_command_get_clock_source(efw, &clock_source);
if (err < 0)
return err;
if (clock_source == SND_EFW_CLOCK_SOURCE_SYTMATCH)
return -ENOSYS;
*sync_mode = CIP_SYNC_TO_DEVICE;
return 0;
}
static int
check_connection_used_by_others(struct snd_efw *efw, struct amdtp_stream *s)
{
struct cmp_connection *conn;
bool used;
int err;
if (s == &efw->tx_stream)
conn = &efw->out_conn;
else
conn = &efw->in_conn;
err = cmp_connection_check_used(conn, &used);
if ((err >= 0) && used && !amdtp_stream_running(s)) {
dev_err(&efw->unit->device,
"Connection established by others: %cPCR[%d]\n",
(conn->direction == CMP_OUTPUT) ? 'o' : 'i',
conn->pcr_index);
err = -EBUSY;
}
return err;
}
int snd_efw_stream_init_duplex(struct snd_efw *efw)
{
int err;
err = init_stream(efw, &efw->tx_stream);
if (err < 0)
goto end;
/* Fireworks transmits NODATA packets with TAG0. */
efw->tx_stream.flags |= CIP_EMPTY_WITH_TAG0;
/* Fireworks has its own meaning for dbc. */
efw->tx_stream.flags |= CIP_DBC_IS_END_EVENT;
/* Fireworks reset dbc at bus reset. */
efw->tx_stream.flags |= CIP_SKIP_DBC_ZERO_CHECK;
/* AudioFire9 always reports wrong dbs. */
if (efw->is_af9)
efw->tx_stream.flags |= CIP_WRONG_DBS;
/* Firmware version 5.5 reports fixed interval for dbc. */
if (efw->firmware_version == 0x5050000)
efw->tx_stream.tx_dbc_interval = 8;
err = init_stream(efw, &efw->rx_stream);
if (err < 0) {
destroy_stream(efw, &efw->tx_stream);
goto end;
}
/*
* Fireworks ignores MIDI messages in more than first 8 data
* blocks of an received AMDTP packet.
*/
efw->rx_stream.rx_blocks_for_midi = 8;
/* set IEC61883 compliant mode (actually not fully compliant...) */
err = snd_efw_command_set_tx_mode(efw, SND_EFW_TRANSPORT_MODE_IEC61883);
if (err < 0) {
destroy_stream(efw, &efw->tx_stream);
destroy_stream(efw, &efw->rx_stream);
}
end:
return err;
}
int snd_efw_stream_start_duplex(struct snd_efw *efw, int rate)
{
struct amdtp_stream *master, *slave;
atomic_t *slave_substreams;
enum cip_flags sync_mode;
unsigned int curr_rate;
int err = 0;
mutex_lock(&efw->mutex);
/* Need no substreams */
if ((atomic_read(&efw->playback_substreams) == 0) &&
(atomic_read(&efw->capture_substreams) == 0))
goto end;
err = get_sync_mode(efw, &sync_mode);
if (err < 0)
goto end;
if (sync_mode == CIP_SYNC_TO_DEVICE) {
master = &efw->tx_stream;
slave = &efw->rx_stream;
slave_substreams = &efw->playback_substreams;
} else {
master = &efw->rx_stream;
slave = &efw->tx_stream;
slave_substreams = &efw->capture_substreams;
}
/*
* Considering JACK/FFADO streaming:
* TODO: This can be removed hwdep functionality becomes popular.
*/
err = check_connection_used_by_others(efw, master);
if (err < 0)
goto end;
/* packet queueing error */
if (amdtp_streaming_error(slave))
stop_stream(efw, slave);
if (amdtp_streaming_error(master))
stop_stream(efw, master);
/* stop streams if rate is different */
err = snd_efw_command_get_sampling_rate(efw, &curr_rate);
if (err < 0)
goto end;
if (rate == 0)
rate = curr_rate;
if (rate != curr_rate) {
stop_stream(efw, slave);
stop_stream(efw, master);
}
/* master should be always running */
if (!amdtp_stream_running(master)) {
amdtp_stream_set_sync(sync_mode, master, slave);
efw->master = master;
err = snd_efw_command_set_sampling_rate(efw, rate);
if (err < 0)
goto end;
err = start_stream(efw, master, rate);
if (err < 0) {
dev_err(&efw->unit->device,
"fail to start AMDTP master stream:%d\n", err);
goto end;
}
}
/* start slave if needed */
if (atomic_read(slave_substreams) > 0 && !amdtp_stream_running(slave)) {
err = start_stream(efw, slave, rate);
if (err < 0) {
dev_err(&efw->unit->device,
"fail to start AMDTP slave stream:%d\n", err);
stop_stream(efw, master);
}
}
end:
mutex_unlock(&efw->mutex);
return err;
}
void snd_efw_stream_stop_duplex(struct snd_efw *efw)
{
struct amdtp_stream *master, *slave;
atomic_t *master_substreams, *slave_substreams;
mutex_lock(&efw->mutex);
if (efw->master == &efw->rx_stream) {
slave = &efw->tx_stream;
master = &efw->rx_stream;
slave_substreams = &efw->capture_substreams;
master_substreams = &efw->playback_substreams;
} else {
slave = &efw->rx_stream;
master = &efw->tx_stream;
slave_substreams = &efw->playback_substreams;
master_substreams = &efw->capture_substreams;
}
if (atomic_read(slave_substreams) == 0) {
stop_stream(efw, slave);
if (atomic_read(master_substreams) == 0)
stop_stream(efw, master);
}
mutex_unlock(&efw->mutex);
}
void snd_efw_stream_update_duplex(struct snd_efw *efw)
{
if ((cmp_connection_update(&efw->out_conn) < 0) ||
(cmp_connection_update(&efw->in_conn) < 0)) {
mutex_lock(&efw->mutex);
stop_stream(efw, &efw->rx_stream);
stop_stream(efw, &efw->tx_stream);
mutex_unlock(&efw->mutex);
} else {
amdtp_stream_update(&efw->rx_stream);
amdtp_stream_update(&efw->tx_stream);
}
}
void snd_efw_stream_destroy_duplex(struct snd_efw *efw)
{
mutex_lock(&efw->mutex);
destroy_stream(efw, &efw->rx_stream);
destroy_stream(efw, &efw->tx_stream);
mutex_unlock(&efw->mutex);
}
void snd_efw_stream_lock_changed(struct snd_efw *efw)
{
efw->dev_lock_changed = true;
wake_up(&efw->hwdep_wait);
}
int snd_efw_stream_lock_try(struct snd_efw *efw)
{
int err;
spin_lock_irq(&efw->lock);
/* user land lock this */
if (efw->dev_lock_count < 0) {
err = -EBUSY;
goto end;
}
/* this is the first time */
if (efw->dev_lock_count++ == 0)
snd_efw_stream_lock_changed(efw);
err = 0;
end:
spin_unlock_irq(&efw->lock);
return err;
}
void snd_efw_stream_lock_release(struct snd_efw *efw)
{
spin_lock_irq(&efw->lock);
if (WARN_ON(efw->dev_lock_count <= 0))
goto end;
if (--efw->dev_lock_count == 0)
snd_efw_stream_lock_changed(efw);
end:
spin_unlock_irq(&efw->lock);
}