sound/firewire/motu/motu-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * motu-pcm.c - a part of driver for MOTU FireWire series
   4  *
   5  * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
   6  */
   7
   8 #include <sound/pcm_params.h>
   9 #include "motu.h"
  10
  11 static 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 = 1
  22         };
  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->fixed_part_pcm_chunks[mode] +
  30                                formats->differed_part_pcm_chunks[mode];
  31                 if (!snd_interval_test(c, pcm_channels))
  32                         continue;
  33
  34                 rates.min = min(rates.min, rate);
  35                 rates.max = max(rates.max, rate);
  36         }
  37
  38         return snd_interval_refine(r, &rates);
  39 }
  40
  41 static int motu_channels_constraint(struct snd_pcm_hw_params *params,
  42                                     struct snd_pcm_hw_rule *rule)
  43 {
  44         struct snd_motu_packet_format *formats = rule->private;
  45
  46         const struct snd_interval *r =
  47                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
  48         struct snd_interval *c =
  49                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  50         struct snd_interval channels = {
  51                 .min = UINT_MAX, .max = 0, .integer = 1
  52         };
  53         unsigned int i, pcm_channels, rate, mode;
  54
  55         for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
  56                 rate = snd_motu_clock_rates[i];
  57                 mode = i / 2;
  58
  59                 if (!snd_interval_test(r, rate))
  60                         continue;
  61
  62                 pcm_channels = formats->fixed_part_pcm_chunks[mode] +
  63                                formats->differed_part_pcm_chunks[mode];
  64                 channels.min = min(channels.min, pcm_channels);
  65                 channels.max = max(channels.max, pcm_channels);
  66         }
  67
  68         return snd_interval_refine(c, &channels);
  69 }
  70
  71 static void limit_channels_and_rates(struct snd_motu *motu,
  72                                      struct snd_pcm_runtime *runtime,
  73                                      struct snd_motu_packet_format *formats)
  74 {
  75         struct snd_pcm_hardware *hw = &runtime->hw;
  76         unsigned int i, pcm_channels, rate, mode;
  77
  78         hw->channels_min = UINT_MAX;
  79         hw->channels_max = 0;
  80
  81         for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) {
  82                 rate = snd_motu_clock_rates[i];
  83                 mode = i / 2;
  84
  85                 pcm_channels = formats->fixed_part_pcm_chunks[mode] +
  86                                formats->differed_part_pcm_chunks[mode];
  87                 if (pcm_channels == 0)
  88                         continue;
  89
  90                 hw->rates |= snd_pcm_rate_to_rate_bit(rate);
  91                 hw->channels_min = min(hw->channels_min, pcm_channels);
  92                 hw->channels_max = max(hw->channels_max, pcm_channels);
  93         }
  94
  95         snd_pcm_limit_hw_rates(runtime);
  96 }
  97
  98 static int init_hw_info(struct snd_motu *motu,
  99                         struct snd_pcm_substream *substream)
 100 {
 101         struct snd_pcm_runtime *runtime = substream->runtime;
 102         struct snd_pcm_hardware *hw = &runtime->hw;
 103         struct amdtp_stream *stream;
 104         struct snd_motu_packet_format *formats;
 105         int err;
 106
 107         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 108                 hw->formats = SNDRV_PCM_FMTBIT_S32;
 109                 stream = &motu->tx_stream;
 110                 formats = &motu->tx_packet_formats;
 111         } else {
 112                 hw->formats = SNDRV_PCM_FMTBIT_S32;
 113                 stream = &motu->rx_stream;
 114                 formats = &motu->rx_packet_formats;
 115         }
 116
 117         limit_channels_and_rates(motu, runtime, formats);
 118
 119         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 120                                   motu_rate_constraint, formats,
 121                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 122         if (err < 0)
 123                 return err;
 124         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 125                                   motu_channels_constraint, formats,
 126                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 127         if (err < 0)
 128                 return err;
 129
 130         return amdtp_motu_add_pcm_hw_constraints(stream, runtime);
 131 }
 132
 133 static int pcm_open(struct snd_pcm_substream *substream)
 134 {
 135         struct snd_motu *motu = substream->private_data;
 136         const struct snd_motu_protocol *const protocol = motu->spec->protocol;
 137         struct amdtp_domain *d = &motu->domain;
 138         enum snd_motu_clock_source src;
 139         int err;
 140
 141         err = snd_motu_stream_lock_try(motu);
 142         if (err < 0)
 143                 return err;
 144
 145         mutex_lock(&motu->mutex);
 146
 147         err = snd_motu_stream_cache_packet_formats(motu);
 148         if (err < 0)
 149                 goto err_locked;
 150
 151         err = init_hw_info(motu, substream);
 152         if (err < 0)
 153                 goto err_locked;
 154
 155         err = protocol->get_clock_source(motu, &src);
 156         if (err < 0)
 157                 goto err_locked;
 158
 159         // When source of clock is not internal or any stream is reserved for
 160         // transmission of PCM frames, the available sampling rate is limited
 161         // at current one.
 162         if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL &&
 163              src != SND_MOTU_CLOCK_SOURCE_SPH) ||
 164             (motu->substreams_counter > 0 && d->events_per_period > 0)) {
 165                 unsigned int frames_per_period = d->events_per_period;
 166                 unsigned int frames_per_buffer = d->events_per_buffer;
 167                 unsigned int rate;
 168
 169                 err = protocol->get_clock_rate(motu, &rate);
 170                 if (err < 0)
 171                         goto err_locked;
 172
 173                 substream->runtime->hw.rate_min = rate;
 174                 substream->runtime->hw.rate_max = rate;
 175
 176                 if (frames_per_period > 0) {
 177                         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 178                                         SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
 179                                         frames_per_period, frames_per_period);
 180                         if (err < 0)
 181                                 goto err_locked;
 182
 183                         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 184                                         SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 185                                         frames_per_buffer, frames_per_buffer);
 186                         if (err < 0)
 187                                 goto err_locked;
 188                 }
 189         }
 190
 191         snd_pcm_set_sync(substream);
 192
 193         mutex_unlock(&motu->mutex);
 194
 195         return 0;
 196 err_locked:
 197         mutex_unlock(&motu->mutex);
 198         snd_motu_stream_lock_release(motu);
 199         return err;
 200 }
 201
 202 static int pcm_close(struct snd_pcm_substream *substream)
 203 {
 204         struct snd_motu *motu = substream->private_data;
 205
 206         snd_motu_stream_lock_release(motu);
 207
 208         return 0;
 209 }
 210
 211 static int pcm_hw_params(struct snd_pcm_substream *substream,
 212                          struct snd_pcm_hw_params *hw_params)
 213 {
 214         struct snd_motu *motu = substream->private_data;
 215         int err = 0;
 216
 217         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 218                 unsigned int rate = params_rate(hw_params);
 219                 unsigned int frames_per_period = params_period_size(hw_params);
 220                 unsigned int frames_per_buffer = params_buffer_size(hw_params);
 221
 222                 mutex_lock(&motu->mutex);
 223                 err = snd_motu_stream_reserve_duplex(motu, rate,
 224                                         frames_per_period, frames_per_buffer);
 225                 if (err >= 0)
 226                         ++motu->substreams_counter;
 227                 mutex_unlock(&motu->mutex);
 228         }
 229
 230         return err;
 231 }
 232
 233 static int pcm_hw_free(struct snd_pcm_substream *substream)
 234 {
 235         struct snd_motu *motu = substream->private_data;
 236
 237         mutex_lock(&motu->mutex);
 238
 239         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 240                 --motu->substreams_counter;
 241
 242         snd_motu_stream_stop_duplex(motu);
 243
 244         mutex_unlock(&motu->mutex);
 245
 246         return 0;
 247 }
 248
 249 static int capture_prepare(struct snd_pcm_substream *substream)
 250 {
 251         struct snd_motu *motu = substream->private_data;
 252         int err;
 253
 254         mutex_lock(&motu->mutex);
 255         err = snd_motu_stream_start_duplex(motu);
 256         mutex_unlock(&motu->mutex);
 257         if (err >= 0)
 258                 amdtp_stream_pcm_prepare(&motu->tx_stream);
 259
 260         return 0;
 261 }
 262 static int playback_prepare(struct snd_pcm_substream *substream)
 263 {
 264         struct snd_motu *motu = substream->private_data;
 265         int err;
 266
 267         mutex_lock(&motu->mutex);
 268         err = snd_motu_stream_start_duplex(motu);
 269         mutex_unlock(&motu->mutex);
 270         if (err >= 0)
 271                 amdtp_stream_pcm_prepare(&motu->rx_stream);
 272
 273         return err;
 274 }
 275
 276 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
 277 {
 278         struct snd_motu *motu = substream->private_data;
 279
 280         switch (cmd) {
 281         case SNDRV_PCM_TRIGGER_START:
 282                 amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
 283                 break;
 284         case SNDRV_PCM_TRIGGER_STOP:
 285                 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
 286                 break;
 287         default:
 288                 return -EINVAL;
 289         }
 290
 291         return 0;
 292 }
 293 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
 294 {
 295         struct snd_motu *motu = substream->private_data;
 296
 297         switch (cmd) {
 298         case SNDRV_PCM_TRIGGER_START:
 299                 amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
 300                 break;
 301         case SNDRV_PCM_TRIGGER_STOP:
 302                 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
 303                 break;
 304         default:
 305                 return -EINVAL;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
 312 {
 313         struct snd_motu *motu = substream->private_data;
 314
 315         return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->tx_stream);
 316 }
 317 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
 318 {
 319         struct snd_motu *motu = substream->private_data;
 320
 321         return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->rx_stream);
 322 }
 323
 324 static int capture_ack(struct snd_pcm_substream *substream)
 325 {
 326         struct snd_motu *motu = substream->private_data;
 327
 328         return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->tx_stream);
 329 }
 330
 331 static int playback_ack(struct snd_pcm_substream *substream)
 332 {
 333         struct snd_motu *motu = substream->private_data;
 334
 335         return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->rx_stream);
 336 }
 337
 338 int snd_motu_create_pcm_devices(struct snd_motu *motu)
 339 {
 340         static const struct snd_pcm_ops capture_ops = {
 341                 .open      = pcm_open,
 342                 .close     = pcm_close,
 343                 .hw_params = pcm_hw_params,
 344                 .hw_free   = pcm_hw_free,
 345                 .prepare   = capture_prepare,
 346                 .trigger   = capture_trigger,
 347                 .pointer   = capture_pointer,
 348                 .ack       = capture_ack,
 349         };
 350         static const struct snd_pcm_ops playback_ops = {
 351                 .open      = pcm_open,
 352                 .close     = pcm_close,
 353                 .hw_params = pcm_hw_params,
 354                 .hw_free   = pcm_hw_free,
 355                 .prepare   = playback_prepare,
 356                 .trigger   = playback_trigger,
 357                 .pointer   = playback_pointer,
 358                 .ack       = playback_ack,
 359         };
 360         struct snd_pcm *pcm;
 361         int err;
 362
 363         err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
 364         if (err < 0)
 365                 return err;
 366         pcm->private_data = motu;
 367         strcpy(pcm->name, motu->card->shortname);
 368
 369         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 370         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 371         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
 372
 373         return 0;
 374 }