sound/firewire/fireface/ff-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ff-pcm.c - a part of driver for RME Fireface series
   4  *
   5  * Copyright (c) 2015-2017 Takashi Sakamoto
   6  */
   7
   8 #include "ff.h"
   9
  10 static int hw_rule_rate(struct snd_pcm_hw_params *params,
  11                         struct snd_pcm_hw_rule *rule)
  12 {
  13         const unsigned int *pcm_channels = rule->private;
  14         struct snd_interval *r =
  15                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
  16         const struct snd_interval *c =
  17                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  18         struct snd_interval t = {
  19                 .min = UINT_MAX, .max = 0, .integer = 1
  20         };
  21         unsigned int i;
  22
  23         for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
  24                 enum snd_ff_stream_mode mode;
  25                 int err;
  26
  27                 err = snd_ff_stream_get_multiplier_mode(i, &mode);
  28                 if (err < 0)
  29                         continue;
  30
  31                 if (!snd_interval_test(c, pcm_channels[mode]))
  32                         continue;
  33
  34                 t.min = min(t.min, amdtp_rate_table[i]);
  35                 t.max = max(t.max, amdtp_rate_table[i]);
  36         }
  37
  38         return snd_interval_refine(r, &t);
  39 }
  40
  41 static int hw_rule_channels(struct snd_pcm_hw_params *params,
  42                             struct snd_pcm_hw_rule *rule)
  43 {
  44         const unsigned int *pcm_channels = rule->private;
  45         struct snd_interval *c =
  46                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  47         const struct snd_interval *r =
  48                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
  49         struct snd_interval t = {
  50                 .min = UINT_MAX, .max = 0, .integer = 1
  51         };
  52         unsigned int i;
  53
  54         for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
  55                 enum snd_ff_stream_mode mode;
  56                 int err;
  57
  58                 err = snd_ff_stream_get_multiplier_mode(i, &mode);
  59                 if (err < 0)
  60                         continue;
  61
  62                 if (!snd_interval_test(r, amdtp_rate_table[i]))
  63                         continue;
  64
  65                 t.min = min(t.min, pcm_channels[mode]);
  66                 t.max = max(t.max, pcm_channels[mode]);
  67         }
  68
  69         return snd_interval_refine(c, &t);
  70 }
  71
  72 static void limit_channels_and_rates(struct snd_pcm_hardware *hw,
  73                                      const unsigned int *pcm_channels)
  74 {
  75         unsigned int rate, channels;
  76         int i;
  77
  78         hw->channels_min = UINT_MAX;
  79         hw->channels_max = 0;
  80         hw->rate_min = UINT_MAX;
  81         hw->rate_max = 0;
  82
  83         for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) {
  84                 enum snd_ff_stream_mode mode;
  85                 int err;
  86
  87                 err = snd_ff_stream_get_multiplier_mode(i, &mode);
  88                 if (err < 0)
  89                         continue;
  90
  91                 channels = pcm_channels[mode];
  92                 if (pcm_channels[mode] == 0)
  93                         continue;
  94                 hw->channels_min = min(hw->channels_min, channels);
  95                 hw->channels_max = max(hw->channels_max, channels);
  96
  97                 rate = amdtp_rate_table[i];
  98                 hw->rates |= snd_pcm_rate_to_rate_bit(rate);
  99                 hw->rate_min = min(hw->rate_min, rate);
 100                 hw->rate_max = max(hw->rate_max, rate);
 101         }
 102 }
 103
 104 static int pcm_init_hw_params(struct snd_ff *ff,
 105                               struct snd_pcm_substream *substream)
 106 {
 107         struct snd_pcm_runtime *runtime = substream->runtime;
 108         struct amdtp_stream *s;
 109         const unsigned int *pcm_channels;
 110         int err;
 111
 112         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 113                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 114                 s = &ff->tx_stream;
 115                 pcm_channels = ff->spec->pcm_capture_channels;
 116         } else {
 117                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
 118                 s = &ff->rx_stream;
 119                 pcm_channels = ff->spec->pcm_playback_channels;
 120         }
 121
 122         limit_channels_and_rates(&runtime->hw, pcm_channels);
 123
 124         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 125                                   hw_rule_channels, (void *)pcm_channels,
 126                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 127         if (err < 0)
 128                 return err;
 129
 130         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 131                                   hw_rule_rate, (void *)pcm_channels,
 132                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 133         if (err < 0)
 134                 return err;
 135
 136         return amdtp_ff_add_pcm_hw_constraints(s, runtime);
 137 }
 138
 139 static int pcm_open(struct snd_pcm_substream *substream)
 140 {
 141         struct snd_ff *ff = substream->private_data;
 142         struct amdtp_domain *d = &ff->domain;
 143         unsigned int rate;
 144         enum snd_ff_clock_src src;
 145         int i, err;
 146
 147         err = snd_ff_stream_lock_try(ff);
 148         if (err < 0)
 149                 return err;
 150
 151         err = pcm_init_hw_params(ff, substream);
 152         if (err < 0)
 153                 goto release_lock;
 154
 155         err = ff->spec->protocol->get_clock(ff, &rate, &src);
 156         if (err < 0)
 157                 goto release_lock;
 158
 159         mutex_lock(&ff->mutex);
 160
 161         // When source of clock is not internal or any stream is reserved for
 162         // transmission of PCM frames, the available sampling rate is limited
 163         // at current one.
 164         if (src != SND_FF_CLOCK_SRC_INTERNAL) {
 165                 for (i = 0; i < CIP_SFC_COUNT; ++i) {
 166                         if (amdtp_rate_table[i] == rate)
 167                                 break;
 168                 }
 169
 170                 // The unit is configured at sampling frequency which packet
 171                 // streaming engine can't support.
 172                 if (i >= CIP_SFC_COUNT) {
 173                         mutex_unlock(&ff->mutex);
 174                         err = -EIO;
 175                         goto release_lock;
 176                 }
 177
 178                 substream->runtime->hw.rate_min = rate;
 179                 substream->runtime->hw.rate_max = rate;
 180         } else {
 181                 if (ff->substreams_counter > 0) {
 182                         unsigned int frames_per_period = d->events_per_period;
 183                         unsigned int frames_per_buffer = d->events_per_buffer;
 184
 185                         rate = amdtp_rate_table[ff->rx_stream.sfc];
 186                         substream->runtime->hw.rate_min = rate;
 187                         substream->runtime->hw.rate_max = rate;
 188
 189                         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 190                                         SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
 191                                         frames_per_period, frames_per_period);
 192                         if (err < 0) {
 193                                 mutex_unlock(&ff->mutex);
 194                                 goto release_lock;
 195                         }
 196
 197                         err = snd_pcm_hw_constraint_minmax(substream->runtime,
 198                                         SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 199                                         frames_per_buffer, frames_per_buffer);
 200                         if (err < 0) {
 201                                 mutex_unlock(&ff->mutex);
 202                                 goto release_lock;
 203                         }
 204                 }
 205         }
 206
 207         mutex_unlock(&ff->mutex);
 208
 209         snd_pcm_set_sync(substream);
 210
 211         return 0;
 212
 213 release_lock:
 214         snd_ff_stream_lock_release(ff);
 215         return err;
 216 }
 217
 218 static int pcm_close(struct snd_pcm_substream *substream)
 219 {
 220         struct snd_ff *ff = substream->private_data;
 221
 222         snd_ff_stream_lock_release(ff);
 223
 224         return 0;
 225 }
 226
 227 static int pcm_hw_params(struct snd_pcm_substream *substream,
 228                          struct snd_pcm_hw_params *hw_params)
 229 {
 230         struct snd_ff *ff = substream->private_data;
 231         int err = 0;
 232
 233         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 234                 unsigned int rate = params_rate(hw_params);
 235                 unsigned int frames_per_period = params_period_size(hw_params);
 236                 unsigned int frames_per_buffer = params_buffer_size(hw_params);
 237
 238                 mutex_lock(&ff->mutex);
 239                 err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period,
 240                                                    frames_per_buffer);
 241                 if (err >= 0)
 242                         ++ff->substreams_counter;
 243                 mutex_unlock(&ff->mutex);
 244         }
 245
 246         return err;
 247 }
 248
 249 static int pcm_hw_free(struct snd_pcm_substream *substream)
 250 {
 251         struct snd_ff *ff = substream->private_data;
 252
 253         mutex_lock(&ff->mutex);
 254
 255         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 256                 --ff->substreams_counter;
 257
 258         snd_ff_stream_stop_duplex(ff);
 259
 260         mutex_unlock(&ff->mutex);
 261
 262         return 0;
 263 }
 264
 265 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
 266 {
 267         struct snd_ff *ff = substream->private_data;
 268         struct snd_pcm_runtime *runtime = substream->runtime;
 269         int err;
 270
 271         mutex_lock(&ff->mutex);
 272
 273         err = snd_ff_stream_start_duplex(ff, runtime->rate);
 274         if (err >= 0)
 275                 amdtp_stream_pcm_prepare(&ff->tx_stream);
 276
 277         mutex_unlock(&ff->mutex);
 278
 279         return err;
 280 }
 281
 282 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 283 {
 284         struct snd_ff *ff = substream->private_data;
 285         struct snd_pcm_runtime *runtime = substream->runtime;
 286         int err;
 287
 288         mutex_lock(&ff->mutex);
 289
 290         err = snd_ff_stream_start_duplex(ff, runtime->rate);
 291         if (err >= 0)
 292                 amdtp_stream_pcm_prepare(&ff->rx_stream);
 293
 294         mutex_unlock(&ff->mutex);
 295
 296         return err;
 297 }
 298
 299 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 300 {
 301         struct snd_ff *ff = substream->private_data;
 302
 303         switch (cmd) {
 304         case SNDRV_PCM_TRIGGER_START:
 305                 amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
 306                 break;
 307         case SNDRV_PCM_TRIGGER_STOP:
 308                 amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
 309                 break;
 310         default:
 311                 return -EINVAL;
 312         }
 313
 314         return 0;
 315 }
 316
 317 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 318 {
 319         struct snd_ff *ff = substream->private_data;
 320
 321         switch (cmd) {
 322         case SNDRV_PCM_TRIGGER_START:
 323                 amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
 324                 break;
 325         case SNDRV_PCM_TRIGGER_STOP:
 326                 amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
 327                 break;
 328         default:
 329                 return -EINVAL;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 336 {
 337         struct snd_ff *ff = sbstrm->private_data;
 338
 339         return amdtp_domain_stream_pcm_pointer(&ff->domain, &ff->tx_stream);
 340 }
 341
 342 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 343 {
 344         struct snd_ff *ff = sbstrm->private_data;
 345
 346         return amdtp_domain_stream_pcm_pointer(&ff->domain, &ff->rx_stream);
 347 }
 348
 349 static int pcm_capture_ack(struct snd_pcm_substream *substream)
 350 {
 351         struct snd_ff *ff = substream->private_data;
 352
 353         return amdtp_domain_stream_pcm_ack(&ff->domain, &ff->tx_stream);
 354 }
 355
 356 static int pcm_playback_ack(struct snd_pcm_substream *substream)
 357 {
 358         struct snd_ff *ff = substream->private_data;
 359
 360         return amdtp_domain_stream_pcm_ack(&ff->domain, &ff->rx_stream);
 361 }
 362
 363 int snd_ff_create_pcm_devices(struct snd_ff *ff)
 364 {
 365         static const struct snd_pcm_ops pcm_capture_ops = {
 366                 .open           = pcm_open,
 367                 .close          = pcm_close,
 368                 .hw_params      = pcm_hw_params,
 369                 .hw_free        = pcm_hw_free,
 370                 .prepare        = pcm_capture_prepare,
 371                 .trigger        = pcm_capture_trigger,
 372                 .pointer        = pcm_capture_pointer,
 373                 .ack            = pcm_capture_ack,
 374         };
 375         static const struct snd_pcm_ops pcm_playback_ops = {
 376                 .open           = pcm_open,
 377                 .close          = pcm_close,
 378                 .hw_params      = pcm_hw_params,
 379                 .hw_free        = pcm_hw_free,
 380                 .prepare        = pcm_playback_prepare,
 381                 .trigger        = pcm_playback_trigger,
 382                 .pointer        = pcm_playback_pointer,
 383                 .ack            = pcm_playback_ack,
 384         };
 385         struct snd_pcm *pcm;
 386         int err;
 387
 388         err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
 389         if (err < 0)
 390                 return err;
 391
 392         pcm->private_data = ff;
 393         snprintf(pcm->name, sizeof(pcm->name),
 394                  "%s PCM", ff->card->shortname);
 395         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 396         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 397         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
 398
 399         return 0;
 400 }