This commit adds a functionality to capture/playback PCM samples.
When AMDTP stream is already running for PCM or the source of clock is not internal, available sampling rate is limited at current one.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/Kconfig | 1 + sound/firewire/bebob/Makefile | 1 + sound/firewire/bebob/bebob.c | 4 + sound/firewire/bebob/bebob.h | 4 + sound/firewire/bebob/bebob_pcm.c | 369 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 379 insertions(+) create mode 100644 sound/firewire/bebob/bebob_pcm.c
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig index 708d3c8..d55fd5f 100644 --- a/sound/firewire/Kconfig +++ b/sound/firewire/Kconfig @@ -83,6 +83,7 @@ config SND_BEBOB tristate "BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware" select SND_FIREWIRE_LIB select SND_RAWMIDI + select SND_PCM help Say Y here to include support for FireWire devices based on BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware: diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile index 1e39e59..533718a 100644 --- a/sound/firewire/bebob/Makefile +++ b/sound/firewire/bebob/Makefile @@ -1,3 +1,4 @@ snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_midi.o \ + bebob_pcm.o \ bebob.o obj-m += snd-bebob.o diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c index 383df9a..dbd12c3 100644 --- a/sound/firewire/bebob/bebob.c +++ b/sound/firewire/bebob/bebob.c @@ -171,6 +171,10 @@ bebob_probe(struct fw_unit *unit, goto error; }
+ err = snd_bebob_create_pcm_devices(bebob); + if (err < 0) + goto error; + err = snd_bebob_stream_init_duplex(bebob); if (err < 0) goto error; diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h index 0d53cff..b41bb91 100644 --- a/sound/firewire/bebob/bebob.h +++ b/sound/firewire/bebob/bebob.h @@ -22,6 +22,8 @@ #include <sound/initval.h> #include <sound/info.h> #include <sound/rawmidi.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h>
#include "../lib.h" #include "../fcp.h" @@ -177,6 +179,8 @@ void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
+int snd_bebob_create_pcm_devices(struct snd_bebob *bebob); + #define SND_BEBOB_DEV_ENTRY(vendor, model) \ { \ .match_flags = IEEE1394_MATCH_VENDOR_ID | \ diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c new file mode 100644 index 0000000..7474309 --- /dev/null +++ b/sound/firewire/bebob/bebob_pcm.c @@ -0,0 +1,369 @@ +/* + * bebob_pcm.c - a part of driver for BeBoB based devices + * + * Copyright (c) 2013-2014 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#include "./bebob.h" + +static int +hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) +{ + struct snd_bebob_stream_formation *formations = 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; + + for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { + /* entry is invalid */ + if (formations[i].pcm == 0) + continue; + + if (!snd_interval_test(c, formations[i].pcm)) + continue; + + t.min = min(t.min, snd_bebob_rate_table[i]); + t.max = max(t.max, snd_bebob_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) +{ + struct snd_bebob_stream_formation *formations = 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; + + for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { + /* entry is invalid */ + if (formations[i].pcm == 0) + continue; + + if (!snd_interval_test(r, snd_bebob_rate_table[i])) + continue; + + t.min = min(t.min, formations[i].pcm); + t.max = max(t.max, formations[i].pcm); + } + + return snd_interval_refine(c, &t); +} + +static void +limit_channels_and_rates(struct snd_pcm_hardware *hw, + struct snd_bebob_stream_formation *formations) +{ + unsigned int i; + + hw->channels_min = UINT_MAX; + hw->channels_max = 0; + + hw->rate_min = UINT_MAX; + hw->rate_max = 0; + hw->rates = 0; + + for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { + /* entry has no PCM channels */ + if (formations[i].pcm == 0) + continue; + + hw->channels_min = min(hw->channels_min, formations[i].pcm); + hw->channels_max = max(hw->channels_max, formations[i].pcm); + + hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); + hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); + hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); + } +} + +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_bebob *bebob, + struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct amdtp_stream *s; + struct snd_bebob_stream_formation *formations; + 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 = AMDTP_IN_PCM_FORMAT_BITS; + s = &bebob->tx_stream; + formations = bebob->tx_stream_formations; + } else { + runtime->hw.formats = AMDTP_OUT_PCM_FORMAT_BITS; + s = &bebob->rx_stream; + formations = bebob->rx_stream_formations; + } + + limit_channels_and_rates(&runtime->hw, formations); + limit_period_and_buffer(&runtime->hw); + + err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, + hw_rule_channels, formations, + SNDRV_PCM_HW_PARAM_RATE, -1); + if (err < 0) + goto end; + + err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, + hw_rule_rate, formations, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); + if (err < 0) + goto end; + + err = amdtp_stream_add_pcm_hw_constraints(s, runtime); +end: + return err; +} + +static int +pcm_open(struct snd_pcm_substream *substream) +{ + struct snd_bebob *bebob = substream->private_data; + unsigned int sampling_rate; + bool internal; + int err; + + err = pcm_init_hw_params(bebob, substream); + if (err < 0) + goto end; + + err = snd_bebob_stream_check_internal_clock(bebob, &internal); + if (err < 0) + goto end; + + /* + * When source of clock is internal or any PCM stream are running, + * the available sampling rate is limited at current sampling rate. + */ + if (!internal || + amdtp_stream_pcm_running(&bebob->tx_stream) || + amdtp_stream_pcm_running(&bebob->rx_stream)) { + err = snd_bebob_stream_get_rate(bebob, &sampling_rate); + if (err < 0) { + dev_err(&bebob->unit->device, + "fail to get sampling rate: %d\n", err); + goto end; + } + + substream->runtime->hw.rate_min = sampling_rate; + substream->runtime->hw.rate_max = sampling_rate; + } + + snd_pcm_set_sync(substream); + +end: + 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_bebob *bebob = substream->private_data; + + if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) + atomic_inc(&bebob->capture_substreams); + amdtp_stream_set_pcm_format(&bebob->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_bebob *bebob = substream->private_data; + + if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) + atomic_inc(&bebob->playback_substreams); + amdtp_stream_set_pcm_format(&bebob->rx_stream, + params_format(hw_params)); + return snd_pcm_lib_alloc_vmalloc_buffer(substream, + params_buffer_bytes(hw_params)); +} + +static int +pcm_capture_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_bebob *bebob = substream->private_data; + + if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) + atomic_dec(&bebob->capture_substreams); + + snd_bebob_stream_stop_duplex(bebob); + + return snd_pcm_lib_free_vmalloc_buffer(substream); +} +static int +pcm_playback_hw_free(struct snd_pcm_substream *substream) +{ + struct snd_bebob *bebob = substream->private_data; + + if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) + atomic_dec(&bebob->playback_substreams); + + snd_bebob_stream_stop_duplex(bebob); + + return snd_pcm_lib_free_vmalloc_buffer(substream); +} + +static int +pcm_capture_prepare(struct snd_pcm_substream *substream) +{ + struct snd_bebob *bebob = substream->private_data; + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + + err = snd_bebob_stream_start_duplex(bebob, runtime->rate); + if (err >= 0) + amdtp_stream_pcm_prepare(&bebob->tx_stream); + + return err; +} +static int +pcm_playback_prepare(struct snd_pcm_substream *substream) +{ + struct snd_bebob *bebob = substream->private_data; + struct snd_pcm_runtime *runtime = substream->runtime; + int err; + + err = snd_bebob_stream_start_duplex(bebob, runtime->rate); + if (err >= 0) + amdtp_stream_pcm_prepare(&bebob->rx_stream); + + return err; +} + +static int +pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_bebob *bebob = substream->private_data; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); + break; + case SNDRV_PCM_TRIGGER_STOP: + amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); + break; + default: + return -EINVAL; + } + + return 0; +} +static int +pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_bebob *bebob = substream->private_data; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); + break; + case SNDRV_PCM_TRIGGER_STOP: + amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); + break; + default: + return -EINVAL; + } + + return 0; +} + +static snd_pcm_uframes_t +pcm_capture_pointer(struct snd_pcm_substream *sbstrm) +{ + struct snd_bebob *bebob = sbstrm->private_data; + return amdtp_stream_pcm_pointer(&bebob->tx_stream); +} +static snd_pcm_uframes_t +pcm_playback_pointer(struct snd_pcm_substream *sbstrm) +{ + struct snd_bebob *bebob = sbstrm->private_data; + return amdtp_stream_pcm_pointer(&bebob->rx_stream); +} + +static const 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 const 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_bebob_create_pcm_devices(struct snd_bebob *bebob) +{ + struct snd_pcm *pcm; + int err; + + err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); + if (err < 0) + goto end; + + pcm->private_data = bebob; + snprintf(pcm->name, sizeof(pcm->name), + "%s PCM", bebob->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); +end: + return err; +}