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ALSA: oxfw: add support for capturing PCM samples
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In previous commit, a support for transmitted packets is added. This commit
add a support for capturing PCM samples.

When any streams are already started, this driver should not change sampling
rate of the device, thus this commit also adds a restriction of sampling rate
in this situation.

Signed-off-by: Takashi Sakamoto <[email protected]>
Acked-by: Clemens Ladisch <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
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@takaswie @tiwai
takaswie authored and tiwai committed Dec 10, 2014
1 parent b0ac000 commit 216e256
Showing 1 changed file with 180 additions and 20 deletions.
200 changes: 180 additions & 20 deletions sound/firewire/oxfw/oxfw-pcm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -118,21 +118,31 @@ static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
}

static int pcm_open(struct snd_pcm_substream *substream)
static int init_hw_params(struct snd_oxfw *oxfw,
struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
u8 **formats;
struct amdtp_stream *stream;
int err;

formats = oxfw->rx_stream_formats;

runtime->hw.info = SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_JOINT_DUPLEX |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID;

if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
runtime->hw.formats = AMDTP_IN_PCM_FORMAT_BITS;
stream = &oxfw->tx_stream;
formats = oxfw->tx_stream_formats;
} else {
runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS;
stream = &oxfw->rx_stream;
formats = oxfw->rx_stream_formats;
}

limit_channels_and_rates(&runtime->hw, formats);
limit_period_and_buffer(&runtime->hw);

Expand All @@ -148,10 +158,55 @@ static int pcm_open(struct snd_pcm_substream *substream)
if (err < 0)
goto end;

err = amdtp_stream_add_pcm_hw_constraints(&oxfw->rx_stream, runtime);
err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
end:
return err;
}

static int limit_to_current_params(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_oxfw_stream_formation formation;
enum avc_general_plug_dir dir;
int err;

if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
dir = AVC_GENERAL_PLUG_DIR_OUT;
else
dir = AVC_GENERAL_PLUG_DIR_IN;

err = snd_oxfw_stream_get_current_formation(oxfw, dir, &formation);
if (err < 0)
goto end;

substream->runtime->hw.channels_min = formation.pcm;
substream->runtime->hw.channels_max = formation.pcm;
substream->runtime->hw.rate_min = formation.rate;
substream->runtime->hw.rate_max = formation.rate;
end:
return err;
}

static int pcm_open(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
int err;

err = init_hw_params(oxfw, substream);
if (err < 0)
goto end;

/*
* When any PCM streams are already running, the available sampling
* rate is limited at current value.
*/
if (amdtp_stream_pcm_running(&oxfw->tx_stream) ||
amdtp_stream_pcm_running(&oxfw->rx_stream)) {
err = limit_to_current_params(substream);
if (err < 0)
goto end;
}

snd_pcm_set_sync(substream);
end:
return err;
Expand All @@ -162,28 +217,89 @@ static int pcm_close(struct snd_pcm_substream *substream)
return 0;
}

static int pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_oxfw *oxfw = substream->private_data;


if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
mutex_lock(&oxfw->mutex);
oxfw->capture_substreams++;
mutex_unlock(&oxfw->mutex);
}

amdtp_stream_set_pcm_format(&oxfw->tx_stream, params_format(hw_params));

return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}
static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_oxfw *oxfw = substream->private_data;

if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
mutex_lock(&oxfw->mutex);
oxfw->playback_substreams++;
mutex_unlock(&oxfw->mutex);
}

amdtp_stream_set_pcm_format(&oxfw->rx_stream, params_format(hw_params));

return snd_pcm_lib_alloc_vmalloc_buffer(substream,
params_buffer_bytes(hw_params));
}

static int pcm_hw_free(struct snd_pcm_substream *substream)
static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;

mutex_lock(&oxfw->mutex);

if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
oxfw->capture_substreams--;

snd_oxfw_stream_stop_simplex(oxfw, &oxfw->tx_stream);

mutex_unlock(&oxfw->mutex);

return snd_pcm_lib_free_vmalloc_buffer(substream);
}
static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;

mutex_lock(&oxfw->mutex);

if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
oxfw->playback_substreams--;

snd_oxfw_stream_stop_simplex(oxfw, &oxfw->rx_stream);

mutex_unlock(&oxfw->mutex);

return snd_pcm_lib_free_vmalloc_buffer(substream);
}

static int pcm_prepare(struct snd_pcm_substream *substream)
static int pcm_capture_prepare(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int err;

mutex_lock(&oxfw->mutex);
err = snd_oxfw_stream_start_simplex(oxfw, &oxfw->tx_stream,
runtime->rate, runtime->channels);
mutex_unlock(&oxfw->mutex);
if (err < 0)
goto end;

amdtp_stream_pcm_prepare(&oxfw->tx_stream);
end:
return err;
}
static int pcm_playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
Expand All @@ -201,7 +317,25 @@ static int pcm_prepare(struct snd_pcm_substream *substream)
return err;
}

static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_substream *pcm;

switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
pcm = substream;
break;
case SNDRV_PCM_TRIGGER_STOP:
pcm = NULL;
break;
default:
return -EINVAL;
}
amdtp_stream_pcm_trigger(&oxfw->tx_stream, pcm);
return 0;
}
static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_pcm_substream *pcm;
Expand All @@ -220,35 +354,61 @@ static int pcm_trigger(struct snd_pcm_substream *substream, int cmd)
return 0;
}

static snd_pcm_uframes_t pcm_pointer(struct snd_pcm_substream *substream)
static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstm)
{
struct snd_oxfw *oxfw = substream->private_data;
struct snd_oxfw *oxfw = sbstm->private_data;

return amdtp_stream_pcm_pointer(&oxfw->tx_stream);
}
static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstm)
{
struct snd_oxfw *oxfw = sbstm->private_data;

return amdtp_stream_pcm_pointer(&oxfw->rx_stream);
}

int snd_oxfw_create_pcm(struct snd_oxfw *oxfw)
{
static struct snd_pcm_ops ops = {
static struct snd_pcm_ops capture_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pcm_capture_hw_params,
.hw_free = pcm_capture_hw_free,
.prepare = pcm_capture_prepare,
.trigger = pcm_capture_trigger,
.pointer = pcm_capture_pointer,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
static struct snd_pcm_ops playback_ops = {
.open = pcm_open,
.close = pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = pcm_hw_params,
.hw_free = pcm_hw_free,
.prepare = pcm_prepare,
.trigger = pcm_trigger,
.pointer = pcm_pointer,
.hw_params = pcm_playback_hw_params,
.hw_free = pcm_playback_hw_free,
.prepare = pcm_playback_prepare,
.trigger = pcm_playback_trigger,
.pointer = pcm_playback_pointer,
.page = snd_pcm_lib_get_vmalloc_page,
.mmap = snd_pcm_lib_mmap_vmalloc,
};
struct snd_pcm *pcm;
unsigned int cap = 0;
int err;

err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, 0, &pcm);
if (oxfw->has_output)
cap = 1;

err = snd_pcm_new(oxfw->card, oxfw->card->driver, 0, 1, cap, &pcm);
if (err < 0)
return err;

pcm->private_data = oxfw;
strcpy(pcm->name, oxfw->card->shortname);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
if (cap > 0)
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);

return 0;
}

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