[alsa-devel] [PATCH 13/30] ALSA: dice: Add support for capturing PCM samples
Takashi Sakamoto
o-takashi at sakamocchi.jp
Fri Nov 28 16:59:22 CET 2014
This commit adds a support for capturing PCM samples.
When opposite PCM substream is already running, available sampling rate is
limited at current one.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/Kconfig | 3 -
sound/firewire/dice/dice-pcm.c | 163 +++++++++++++++++++++++++++++++++++++----
2 files changed, 149 insertions(+), 17 deletions(-)
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 46dff64..c8e704c 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -20,9 +20,6 @@ config SND_DICE
Say Y here to include support for many DACs based on the DICE
chip family (DICE-II/Jr/Mini) from TC Applied Technologies.
- At the moment, this driver supports playback only. If you
- want to use devices that support capturing, use FFADO instead.
-
To compile this driver as a module, choose M here: the module
will be called snd-dice.
diff --git a/sound/firewire/dice/dice-pcm.c b/sound/firewire/dice/dice-pcm.c
index 062b7a3..ec1d568 100644
--- a/sound/firewire/dice/dice-pcm.c
+++ b/sound/firewire/dice/dice-pcm.c
@@ -12,7 +12,8 @@
static int dice_rate_constraint(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
- struct snd_dice *dice = rule->private;
+ struct snd_pcm_substream *substream = rule->private;
+ struct snd_dice *dice = substream->private_data;
const struct snd_interval *c =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
@@ -21,7 +22,12 @@ static int dice_rate_constraint(struct snd_pcm_hw_params *params,
struct snd_interval rates = {
.min = UINT_MAX, .max = 0, .integer = 1
};
- unsigned int i, rate, mode, *pcm_channels = dice->rx_channels;
+ unsigned int i, rate, mode, *pcm_channels;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ pcm_channels = dice->tx_channels;
+ else
+ pcm_channels = dice->rx_channels;
for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
rate = snd_dice_rates[i];
@@ -41,7 +47,8 @@ static int dice_rate_constraint(struct snd_pcm_hw_params *params,
static int dice_channels_constraint(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
- struct snd_dice *dice = rule->private;
+ struct snd_pcm_substream *substream = rule->private;
+ struct snd_dice *dice = substream->private_data;
const struct snd_interval *r =
hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
@@ -50,7 +57,12 @@ static int dice_channels_constraint(struct snd_pcm_hw_params *params,
struct snd_interval channels = {
.min = UINT_MAX, .max = 0, .integer = 1
};
- unsigned int i, rate, mode, *pcm_channels = dice->rx_channels;
+ unsigned int i, rate, mode, *pcm_channels;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ pcm_channels = dice->tx_channels;
+ else
+ pcm_channels = dice->rx_channels;
for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) {
rate = snd_dice_rates[i];
@@ -109,30 +121,42 @@ static int init_hw_info(struct snd_dice *dice,
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_pcm_hardware *hw = &runtime->hw;
+ struct amdtp_stream *stream;
+ unsigned int *pcm_channels;
int err;
hw->info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_JOINT_DUPLEX |
SNDRV_PCM_INFO_BLOCK_TRANSFER;
- hw->formats = AMDTP_OUT_PCM_FORMAT_BITS;
- limit_channels_and_rates(dice, runtime, dice->rx_channels);
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ hw->formats = AMDTP_IN_PCM_FORMAT_BITS;
+ stream = &dice->tx_stream;
+ pcm_channels = dice->tx_channels;
+ } else {
+ hw->formats = AMDTP_OUT_PCM_FORMAT_BITS;
+ stream = &dice->rx_stream;
+ pcm_channels = dice->rx_channels;
+ }
+
+ limit_channels_and_rates(dice, runtime, pcm_channels);
limit_period_and_buffer(hw);
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
- dice_rate_constraint, dice,
+ dice_rate_constraint, substream,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (err < 0)
goto end;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
- dice_channels_constraint, dice,
+ dice_channels_constraint, substream,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (err < 0)
goto end;
- err = amdtp_stream_add_pcm_hw_constraints(&dice->rx_stream, runtime);
+ err = amdtp_stream_add_pcm_hw_constraints(stream, runtime);
end:
return err;
}
@@ -172,10 +196,12 @@ static int pcm_open(struct snd_pcm_substream *substream)
}
/*
- * When source of clock is not internal, available sampling rate is
- * limited at current sampling rate.
+ * When source of clock is not internal or any PCM streams are running,
+ * available sampling rate is limited at current sampling rate.
*/
- if (!internal) {
+ if (!internal ||
+ amdtp_stream_pcm_running(&dice->tx_stream) ||
+ amdtp_stream_pcm_running(&dice->rx_stream)) {
err = snd_dice_transaction_get_rate(dice, &rate);
if (err < 0)
goto err_locked;
@@ -200,10 +226,36 @@ static int pcm_close(struct snd_pcm_substream *substream)
return 0;
}
+static int capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_dice *dice = substream->private_data;
+
+ mutex_lock(&dice->mutex);
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ dice->substreams_counter++;
+
+ mutex_unlock(&dice->mutex);
+
+ amdtp_stream_set_pcm_format(&dice->tx_stream,
+ params_format(hw_params));
+
+ return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+}
static int playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_dice *dice = substream->private_data;
+
+ mutex_lock(&dice->mutex);
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ dice->substreams_counter++;
+
+ mutex_unlock(&dice->mutex);
+
amdtp_stream_set_pcm_format(&dice->rx_stream,
params_format(hw_params));
@@ -211,17 +263,51 @@ static int playback_hw_params(struct snd_pcm_substream *substream,
params_buffer_bytes(hw_params));
}
+static int capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_dice *dice = substream->private_data;
+
+ mutex_lock(&dice->mutex);
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ dice->substreams_counter--;
+
+ snd_dice_stream_stop_duplex(dice);
+
+ mutex_unlock(&dice->mutex);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
static int playback_hw_free(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
mutex_lock(&dice->mutex);
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ dice->substreams_counter--;
+
snd_dice_stream_stop_duplex(dice);
+
mutex_unlock(&dice->mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
+static int capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_dice *dice = substream->private_data;
+ int err;
+
+ mutex_lock(&dice->mutex);
+ err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
+ mutex_unlock(&dice->mutex);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&dice->tx_stream);
+
+ return 0;
+}
static int playback_prepare(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
@@ -236,6 +322,23 @@ static int playback_prepare(struct snd_pcm_substream *substream)
return err;
}
+static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_dice *dice = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&dice->tx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&dice->tx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_dice *dice = substream->private_data;
@@ -254,6 +357,12 @@ static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
return 0;
}
+static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
+{
+ struct snd_dice *dice = substream->private_data;
+
+ return amdtp_stream_pcm_pointer(&dice->tx_stream);
+}
static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
{
struct snd_dice *dice = substream->private_data;
@@ -263,6 +372,18 @@ static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
int snd_dice_create_pcm(struct snd_dice *dice)
{
+ static struct snd_pcm_ops capture_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = capture_hw_params,
+ .hw_free = capture_hw_free,
+ .prepare = capture_prepare,
+ .trigger = capture_trigger,
+ .pointer = 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,
@@ -276,14 +397,28 @@ int snd_dice_create_pcm(struct snd_dice *dice)
.mmap = snd_pcm_lib_mmap_vmalloc,
};
struct snd_pcm *pcm;
+ unsigned int i, capture, playback;
int err;
- err = snd_pcm_new(dice->card, "DICE", 0, 1, 0, &pcm);
+ capture = playback = 0;
+ for (i = 0; i < 3; i++) {
+ if (dice->tx_channels[i] > 0)
+ capture = 1;
+ if (dice->rx_channels[i] > 0)
+ playback = 1;
+ }
+
+ err = snd_pcm_new(dice->card, "DICE", 0, playback, capture, &pcm);
if (err < 0)
return err;
pcm->private_data = dice;
strcpy(pcm->name, dice->card->shortname);
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
+
+ if (capture > 0)
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
+
+ if (playback > 0)
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
return 0;
}
--
2.1.0
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