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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * motu-pcm.c - a part of driver for MOTU FireWire series4 *5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>6 */7 8#include <sound/pcm_params.h>9#include "motu.h"10 11static int motu_rate_constraint(struct snd_pcm_hw_params *params,12 struct snd_pcm_hw_rule *rule)13{14 struct snd_motu_packet_format *formats = rule->private;15 16 const struct snd_interval *c =17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);18 struct snd_interval *r =19 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);20 struct snd_interval rates = {21 .min = UINT_MAX, .max = 0, .integer = 122 };23 unsigned int i, pcm_channels, rate, mode;24 25 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {26 rate = snd_motu_clock_rates[i];27 mode = i / 2;28 29 pcm_channels = formats->pcm_chunks[mode];30 if (!snd_interval_test(c, pcm_channels))31 continue;32 33 rates.min = min(rates.min, rate);34 rates.max = max(rates.max, rate);35 }36 37 return snd_interval_refine(r, &rates);38}39 40static int motu_channels_constraint(struct snd_pcm_hw_params *params,41 struct snd_pcm_hw_rule *rule)42{43 struct snd_motu_packet_format *formats = rule->private;44 45 const struct snd_interval *r =46 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);47 struct snd_interval *c =48 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);49 struct snd_interval channels = {50 .min = UINT_MAX, .max = 0, .integer = 151 };52 unsigned int i, pcm_channels, rate, mode;53 54 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {55 rate = snd_motu_clock_rates[i];56 mode = i / 2;57 58 if (!snd_interval_test(r, rate))59 continue;60 61 pcm_channels = formats->pcm_chunks[mode];62 channels.min = min(channels.min, pcm_channels);63 channels.max = max(channels.max, pcm_channels);64 }65 66 return snd_interval_refine(c, &channels);67}68 69static void limit_channels_and_rates(struct snd_motu *motu,70 struct snd_pcm_runtime *runtime,71 struct snd_motu_packet_format *formats)72{73 struct snd_pcm_hardware *hw = &runtime->hw;74 unsigned int i, pcm_channels, rate, mode;75 76 hw->channels_min = UINT_MAX;77 hw->channels_max = 0;78 79 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {80 rate = snd_motu_clock_rates[i];81 mode = i / 2;82 83 pcm_channels = formats->pcm_chunks[mode];84 if (pcm_channels == 0)85 continue;86 87 hw->rates |= snd_pcm_rate_to_rate_bit(rate);88 hw->channels_min = min(hw->channels_min, pcm_channels);89 hw->channels_max = max(hw->channels_max, pcm_channels);90 }91 92 snd_pcm_limit_hw_rates(runtime);93}94 95static int init_hw_info(struct snd_motu *motu,96 struct snd_pcm_substream *substream)97{98 struct snd_pcm_runtime *runtime = substream->runtime;99 struct snd_pcm_hardware *hw = &runtime->hw;100 struct amdtp_stream *stream;101 struct snd_motu_packet_format *formats;102 int err;103 104 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {105 hw->formats = SNDRV_PCM_FMTBIT_S32;106 stream = &motu->tx_stream;107 formats = &motu->tx_packet_formats;108 } else {109 hw->formats = SNDRV_PCM_FMTBIT_S32;110 stream = &motu->rx_stream;111 formats = &motu->rx_packet_formats;112 }113 114 limit_channels_and_rates(motu, runtime, formats);115 116 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,117 motu_rate_constraint, formats,118 SNDRV_PCM_HW_PARAM_CHANNELS, -1);119 if (err < 0)120 return err;121 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,122 motu_channels_constraint, formats,123 SNDRV_PCM_HW_PARAM_RATE, -1);124 if (err < 0)125 return err;126 127 return amdtp_motu_add_pcm_hw_constraints(stream, runtime);128}129 130static int pcm_open(struct snd_pcm_substream *substream)131{132 struct snd_motu *motu = substream->private_data;133 struct amdtp_domain *d = &motu->domain;134 enum snd_motu_clock_source src;135 int err;136 137 err = snd_motu_stream_lock_try(motu);138 if (err < 0)139 return err;140 141 mutex_lock(&motu->mutex);142 143 err = snd_motu_stream_cache_packet_formats(motu);144 if (err < 0)145 goto err_locked;146 147 err = init_hw_info(motu, substream);148 if (err < 0)149 goto err_locked;150 151 err = snd_motu_protocol_get_clock_source(motu, &src);152 if (err < 0)153 goto err_locked;154 155 // When source of clock is not internal or any stream is reserved for156 // transmission of PCM frames, the available sampling rate is limited157 // at current one.158 if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&159 src != SND_MOTU_CLOCK_SOURCE_SPH) ||160 (motu->substreams_counter > 0 && d->events_per_period > 0)) {161 unsigned int frames_per_period = d->events_per_period;162 unsigned int frames_per_buffer = d->events_per_buffer;163 unsigned int rate;164 165 err = snd_motu_protocol_get_clock_rate(motu, &rate);166 if (err < 0)167 goto err_locked;168 169 substream->runtime->hw.rate_min = rate;170 substream->runtime->hw.rate_max = rate;171 172 if (frames_per_period > 0) {173 err = snd_pcm_hw_constraint_minmax(substream->runtime,174 SNDRV_PCM_HW_PARAM_PERIOD_SIZE,175 frames_per_period, frames_per_period);176 if (err < 0)177 goto err_locked;178 179 err = snd_pcm_hw_constraint_minmax(substream->runtime,180 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,181 frames_per_buffer, frames_per_buffer);182 if (err < 0)183 goto err_locked;184 }185 }186 187 snd_pcm_set_sync(substream);188 189 mutex_unlock(&motu->mutex);190 191 return 0;192err_locked:193 mutex_unlock(&motu->mutex);194 snd_motu_stream_lock_release(motu);195 return err;196}197 198static int pcm_close(struct snd_pcm_substream *substream)199{200 struct snd_motu *motu = substream->private_data;201 202 snd_motu_stream_lock_release(motu);203 204 return 0;205}206 207static int pcm_hw_params(struct snd_pcm_substream *substream,208 struct snd_pcm_hw_params *hw_params)209{210 struct snd_motu *motu = substream->private_data;211 int err = 0;212 213 if (substream->runtime->state == SNDRV_PCM_STATE_OPEN) {214 unsigned int rate = params_rate(hw_params);215 unsigned int frames_per_period = params_period_size(hw_params);216 unsigned int frames_per_buffer = params_buffer_size(hw_params);217 218 mutex_lock(&motu->mutex);219 err = snd_motu_stream_reserve_duplex(motu, rate,220 frames_per_period, frames_per_buffer);221 if (err >= 0)222 ++motu->substreams_counter;223 mutex_unlock(&motu->mutex);224 }225 226 return err;227}228 229static int pcm_hw_free(struct snd_pcm_substream *substream)230{231 struct snd_motu *motu = substream->private_data;232 233 mutex_lock(&motu->mutex);234 235 if (substream->runtime->state != SNDRV_PCM_STATE_OPEN)236 --motu->substreams_counter;237 238 snd_motu_stream_stop_duplex(motu);239 240 mutex_unlock(&motu->mutex);241 242 return 0;243}244 245static int capture_prepare(struct snd_pcm_substream *substream)246{247 struct snd_motu *motu = substream->private_data;248 int err;249 250 mutex_lock(&motu->mutex);251 err = snd_motu_stream_start_duplex(motu);252 mutex_unlock(&motu->mutex);253 if (err >= 0)254 amdtp_stream_pcm_prepare(&motu->tx_stream);255 256 return 0;257}258static int playback_prepare(struct snd_pcm_substream *substream)259{260 struct snd_motu *motu = substream->private_data;261 int err;262 263 mutex_lock(&motu->mutex);264 err = snd_motu_stream_start_duplex(motu);265 mutex_unlock(&motu->mutex);266 if (err >= 0)267 amdtp_stream_pcm_prepare(&motu->rx_stream);268 269 return err;270}271 272static int capture_trigger(struct snd_pcm_substream *substream, int cmd)273{274 struct snd_motu *motu = substream->private_data;275 276 switch (cmd) {277 case SNDRV_PCM_TRIGGER_START:278 amdtp_stream_pcm_trigger(&motu->tx_stream, substream);279 break;280 case SNDRV_PCM_TRIGGER_STOP:281 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);282 break;283 default:284 return -EINVAL;285 }286 287 return 0;288}289static int playback_trigger(struct snd_pcm_substream *substream, int cmd)290{291 struct snd_motu *motu = substream->private_data;292 293 switch (cmd) {294 case SNDRV_PCM_TRIGGER_START:295 amdtp_stream_pcm_trigger(&motu->rx_stream, substream);296 break;297 case SNDRV_PCM_TRIGGER_STOP:298 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);299 break;300 default:301 return -EINVAL;302 }303 304 return 0;305}306 307static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)308{309 struct snd_motu *motu = substream->private_data;310 311 return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->tx_stream);312}313static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)314{315 struct snd_motu *motu = substream->private_data;316 317 return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->rx_stream);318}319 320static int capture_ack(struct snd_pcm_substream *substream)321{322 struct snd_motu *motu = substream->private_data;323 324 return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->tx_stream);325}326 327static int playback_ack(struct snd_pcm_substream *substream)328{329 struct snd_motu *motu = substream->private_data;330 331 return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->rx_stream);332}333 334int snd_motu_create_pcm_devices(struct snd_motu *motu)335{336 static const struct snd_pcm_ops capture_ops = {337 .open = pcm_open,338 .close = pcm_close,339 .hw_params = pcm_hw_params,340 .hw_free = pcm_hw_free,341 .prepare = capture_prepare,342 .trigger = capture_trigger,343 .pointer = capture_pointer,344 .ack = capture_ack,345 };346 static const struct snd_pcm_ops playback_ops = {347 .open = pcm_open,348 .close = pcm_close,349 .hw_params = pcm_hw_params,350 .hw_free = pcm_hw_free,351 .prepare = playback_prepare,352 .trigger = playback_trigger,353 .pointer = playback_pointer,354 .ack = playback_ack,355 };356 struct snd_pcm *pcm;357 int err;358 359 err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);360 if (err < 0)361 return err;362 pcm->private_data = motu;363 pcm->nonatomic = true;364 strcpy(pcm->name, motu->card->shortname);365 366 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);367 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);368 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);369 370 return 0;371}372