[alsa-devel] [PATCH 10/11] fireface: add PCM functionality
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sun Dec 20 13:28:42 CET 2015
This commit adds PCM functionality to transmit/receive PCM samples on
isochronous packet streaming. This commit enables userspace applications
to start/stop packet streaming via ALSA PCM interface.
The requested sampling rate is basically used as sampling transfer
frequency of AMDTP packet streaming. This is restricted when the device is
synchronized to external clock source. In this case, input clock rate
is used as the sampling transfer frequency, except for 64.0/128.0 kHz.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/fireface/Makefile | 3 +-
sound/firewire/fireface/fireface-pcm.c | 381 +++++++++++++++++++++++++++++++++
sound/firewire/fireface/fireface.c | 4 +
sound/firewire/fireface/fireface.h | 2 +
4 files changed, 389 insertions(+), 1 deletion(-)
create mode 100644 sound/firewire/fireface/fireface-pcm.c
diff --git a/sound/firewire/fireface/Makefile b/sound/firewire/fireface/Makefile
index 5b4bb68..4b6b9a9 100644
--- a/sound/firewire/fireface/Makefile
+++ b/sound/firewire/fireface/Makefile
@@ -1,3 +1,4 @@
snd-fireface-objs := fireface.o fireface-transaction.o fireface-midi.o \
- fireface-proc.o amdtp-ff.o fireface-stream.o
+ fireface-proc.o amdtp-ff.o fireface-stream.o \
+ fireface-pcm.o
obj-$(CONFIG_SND_FIREFACE) += snd-fireface.o
diff --git a/sound/firewire/fireface/fireface-pcm.c b/sound/firewire/fireface/fireface-pcm.c
new file mode 100644
index 0000000..705df28
--- /dev/null
+++ b/sound/firewire/fireface/fireface-pcm.c
@@ -0,0 +1,381 @@
+/*
+ * fireface-pcm.c - a part of driver for RME Fireface series
+ *
+ * Copyright (c) 2015-2016 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "fireface.h"
+
+static inline unsigned int get_multiplier_mode_with_index(unsigned int index)
+{
+ return ((int)index - 1) / 2;
+}
+
+static int hw_rule_rate(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ const unsigned int *pcm_channels = rule->private;
+ struct snd_interval *r =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ const struct snd_interval *c =
+ hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ struct snd_interval t = {
+ .min = UINT_MAX, .max = 0, .integer = 1
+ };
+ unsigned int i, mode;
+
+ for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+ if (!snd_interval_test(c, pcm_channels[mode]))
+ continue;
+
+ t.min = min(t.min, amdtp_rate_table[i]);
+ t.max = max(t.max, amdtp_rate_table[i]);
+ }
+
+ return snd_interval_refine(r, &t);
+}
+
+static int hw_rule_channels(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ const unsigned int *pcm_channels = rule->private;
+ struct snd_interval *c =
+ hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ const struct snd_interval *r =
+ hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
+ struct snd_interval t = {
+ .min = UINT_MAX, .max = 0, .integer = 1
+ };
+ unsigned int i, mode;
+
+ for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+ if (!snd_interval_test(r, amdtp_rate_table[i]))
+ continue;
+
+ t.min = min(t.min, pcm_channels[mode]);
+ t.max = max(t.max, pcm_channels[mode]);
+ }
+
+ return snd_interval_refine(c, &t);
+}
+
+static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
+ const unsigned int *pcm_channels)
+{
+ unsigned int mode;
+ unsigned int rate, channels;
+ int i;
+
+ hw->channels_min = UINT_MAX;
+ hw->channels_max = 0;
+ hw->rate_min = UINT_MAX;
+ hw->rate_max = 0;
+
+ for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
+ mode = get_multiplier_mode_with_index(i);
+
+ channels = pcm_channels[mode];
+ if (pcm_channels[mode] == 0)
+ continue;
+ hw->channels_min = min(hw->channels_min, channels);
+ hw->channels_max = max(hw->channels_max, channels);
+
+ rate = amdtp_rate_table[i];
+ hw->rates |= snd_pcm_rate_to_rate_bit(rate);
+ hw->rate_min = min(hw->rate_min, rate);
+ hw->rate_max = max(hw->rate_max, rate);
+ }
+}
+
+static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
+{
+ hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */
+ hw->periods_max = UINT_MAX;
+
+ hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */
+
+ /* Just to prevent from allocating much pages. */
+ hw->period_bytes_max = hw->period_bytes_min * 2048;
+ hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
+}
+
+static int pcm_init_hw_params(struct snd_ff *ff,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct amdtp_stream *s;
+ const unsigned int *pcm_channels;
+ int err;
+
+ 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 = SNDRV_PCM_FMTBIT_S32;
+ s = &ff->tx_stream;
+ pcm_channels = ff->spec->pcm_capture_channels;
+ } else {
+ runtime->hw.formats = SNDRV_PCM_FMTBIT_S32 |
+ SNDRV_PCM_FMTBIT_S16;
+ s = &ff->rx_stream;
+ pcm_channels = ff->spec->pcm_playback_channels;
+ }
+
+ /* limit rates */
+ limit_channels_and_rates(&runtime->hw, pcm_channels);
+ limit_period_and_buffer(&runtime->hw);
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw_rule_channels, (void *)pcm_channels,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ hw_rule_rate, (void *)pcm_channels,
+ SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (err < 0)
+ return err;
+
+ return amdtp_ff_add_pcm_hw_constraints(s, runtime);
+}
+
+static int pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_ff *ff = substream->private_data;
+ unsigned int rate;
+ enum snd_ff_clock_src src;
+ int err;
+
+ err = pcm_init_hw_params(ff, substream);
+ if (err < 0)
+ return err;
+
+ err = snd_ff_stream_get_clock(ff, &rate, &src);
+ if (src != SND_FF_CLOCK_SRC_INTERNAL ||
+ amdtp_stream_pcm_running(&ff->rx_stream) ||
+ amdtp_stream_pcm_running(&ff->tx_stream)) {
+ substream->runtime->hw.rate_min = rate;
+ substream->runtime->hw.rate_max = rate;
+ }
+
+ snd_pcm_set_sync(substream);
+
+ return err;
+}
+
+static int pcm_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+static int pcm_capture_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_ff *ff = substream->private_data;
+ int err;
+
+ err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ if (err < 0)
+ return err;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&ff->mutex);
+ ff->substreams_counter++;
+ mutex_unlock(&ff->mutex);
+ }
+
+ amdtp_ff_set_pcm_format(&ff->tx_stream, params_format(hw_params));
+
+ return 0;
+}
+
+static int pcm_playback_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct snd_ff *ff = substream->private_data;
+ int err;
+
+ err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
+ params_buffer_bytes(hw_params));
+ if (err < 0)
+ return err;
+
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ mutex_lock(&ff->mutex);
+ ff->substreams_counter++;
+ mutex_unlock(&ff->mutex);
+ }
+
+ amdtp_ff_set_pcm_format(&ff->rx_stream, params_format(hw_params));
+
+ return 0;
+}
+
+static int pcm_capture_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_ff *ff = substream->private_data;
+
+ mutex_lock(&ff->mutex);
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ ff->substreams_counter--;
+
+ snd_ff_stream_stop_duplex(ff);
+
+ mutex_unlock(&ff->mutex);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int pcm_playback_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_ff *ff = substream->private_data;
+
+ mutex_lock(&ff->mutex);
+
+ if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
+ ff->substreams_counter--;
+
+ snd_ff_stream_stop_duplex(ff);
+
+ mutex_unlock(&ff->mutex);
+
+ return snd_pcm_lib_free_vmalloc_buffer(substream);
+}
+
+static int pcm_capture_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_ff *ff = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ mutex_lock(&ff->mutex);
+
+ err = snd_ff_stream_start_duplex(ff, runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&ff->tx_stream);
+
+ mutex_unlock(&ff->mutex);
+
+ return err;
+}
+
+static int pcm_playback_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_ff *ff = substream->private_data;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ mutex_lock(&ff->mutex);
+
+ err = snd_ff_stream_start_duplex(ff, runtime->rate);
+ if (err >= 0)
+ amdtp_stream_pcm_prepare(&ff->rx_stream);
+
+ mutex_unlock(&ff->mutex);
+
+ return err;
+}
+
+static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_ff *ff = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+ struct snd_ff *ff = substream->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_ff *ff = sbstrm->private_data;
+
+ return amdtp_stream_pcm_pointer(&ff->tx_stream);
+}
+
+static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
+{
+ struct snd_ff *ff = sbstrm->private_data;
+
+ return amdtp_stream_pcm_pointer(&ff->rx_stream);
+}
+
+static struct snd_pcm_ops pcm_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,
+};
+
+static struct snd_pcm_ops pcm_playback_ops = {
+ .open = pcm_open,
+ .close = pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .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,
+};
+
+int snd_ff_create_pcm_devices(struct snd_ff *ff)
+{
+ struct snd_pcm *pcm;
+ int err;
+
+ err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
+ if (err < 0)
+ return err;
+
+ pcm->private_data = ff;
+ snprintf(pcm->name, sizeof(pcm->name),
+ "%s PCM", ff->card->shortname);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
+
+ return 0;
+}
diff --git a/sound/firewire/fireface/fireface.c b/sound/firewire/fireface/fireface.c
index 52efbd0..59f0441 100644
--- a/sound/firewire/fireface/fireface.c
+++ b/sound/firewire/fireface/fireface.c
@@ -67,6 +67,10 @@ static void do_probe(struct work_struct *work)
if (err < 0)
goto end;
+ err = snd_ff_create_pcm_devices(ff);
+ if (err < 0)
+ goto end;
+
err = snd_card_register(ff->card);
if (err < 0)
goto end;
diff --git a/sound/firewire/fireface/fireface.h b/sound/firewire/fireface/fireface.h
index 991f9d4..63834e7 100644
--- a/sound/firewire/fireface/fireface.h
+++ b/sound/firewire/fireface/fireface.h
@@ -116,4 +116,6 @@ void snd_ff_proc_init(struct snd_ff *ff);
int snd_ff_create_midi_devices(struct snd_ff *ff);
+int snd_ff_create_pcm_devices(struct snd_ff *ff);
+
#endif
--
2.5.0
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