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;
 232
 233         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 234                                                params_buffer_bytes(hw_params));
 235         if (err < 0)
 236                 return err;
 237
 238         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 239                 unsigned int rate = params_rate(hw_params);
 240                 unsigned int frames_per_period = params_period_size(hw_params);
 241                 unsigned int frames_per_buffer = params_buffer_size(hw_params);
 242
 243                 mutex_lock(&ff->mutex);
 244                 err = snd_ff_stream_reserve_duplex(ff, rate, frames_per_period,
 245                                                    frames_per_buffer);
 246                 if (err >= 0)
 247                         ++ff->substreams_counter;
 248                 mutex_unlock(&ff->mutex);
 249         }
 250
 251         return 0;
 252 }
 253
 254 static int pcm_hw_free(struct snd_pcm_substream *substream)
 255 {
 256         struct snd_ff *ff = substream->private_data;
 257
 258         mutex_lock(&ff->mutex);
 259
 260         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 261                 --ff->substreams_counter;
 262
 263         snd_ff_stream_stop_duplex(ff);
 264
 265         mutex_unlock(&ff->mutex);
 266
 267         return snd_pcm_lib_free_vmalloc_buffer(substream);
 268 }
 269
 270 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
 271 {
 272         struct snd_ff *ff = substream->private_data;
 273         struct snd_pcm_runtime *runtime = substream->runtime;
 274         int err;
 275
 276         mutex_lock(&ff->mutex);
 277
 278         err = snd_ff_stream_start_duplex(ff, runtime->rate);
 279         if (err >= 0)
 280                 amdtp_stream_pcm_prepare(&ff->tx_stream);
 281
 282         mutex_unlock(&ff->mutex);
 283
 284         return err;
 285 }
 286
 287 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 288 {
 289         struct snd_ff *ff = substream->private_data;
 290         struct snd_pcm_runtime *runtime = substream->runtime;
 291         int err;
 292
 293         mutex_lock(&ff->mutex);
 294
 295         err = snd_ff_stream_start_duplex(ff, runtime->rate);
 296         if (err >= 0)
 297                 amdtp_stream_pcm_prepare(&ff->rx_stream);
 298
 299         mutex_unlock(&ff->mutex);
 300
 301         return err;
 302 }
 303
 304 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 305 {
 306         struct snd_ff *ff = substream->private_data;
 307
 308         switch (cmd) {
 309         case SNDRV_PCM_TRIGGER_START:
 310                 amdtp_stream_pcm_trigger(&ff->tx_stream, substream);
 311                 break;
 312         case SNDRV_PCM_TRIGGER_STOP:
 313                 amdtp_stream_pcm_trigger(&ff->tx_stream, NULL);
 314                 break;
 315         default:
 316                 return -EINVAL;
 317         }
 318
 319         return 0;
 320 }
 321
 322 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 323 {
 324         struct snd_ff *ff = substream->private_data;
 325
 326         switch (cmd) {
 327         case SNDRV_PCM_TRIGGER_START:
 328                 amdtp_stream_pcm_trigger(&ff->rx_stream, substream);
 329                 break;
 330         case SNDRV_PCM_TRIGGER_STOP:
 331                 amdtp_stream_pcm_trigger(&ff->rx_stream, NULL);
 332                 break;
 333         default:
 334                 return -EINVAL;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 341 {
 342         struct snd_ff *ff = sbstrm->private_data;
 343
 344         return amdtp_stream_pcm_pointer(&ff->tx_stream);
 345 }
 346
 347 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 348 {
 349         struct snd_ff *ff = sbstrm->private_data;
 350
 351         return amdtp_stream_pcm_pointer(&ff->rx_stream);
 352 }
 353
 354 static int pcm_capture_ack(struct snd_pcm_substream *substream)
 355 {
 356         struct snd_ff *ff = substream->private_data;
 357
 358         return amdtp_stream_pcm_ack(&ff->tx_stream);
 359 }
 360
 361 static int pcm_playback_ack(struct snd_pcm_substream *substream)
 362 {
 363         struct snd_ff *ff = substream->private_data;
 364
 365         return amdtp_stream_pcm_ack(&ff->rx_stream);
 366 }
 367
 368 int snd_ff_create_pcm_devices(struct snd_ff *ff)
 369 {
 370         static const struct snd_pcm_ops pcm_capture_ops = {
 371                 .open           = pcm_open,
 372                 .close          = pcm_close,
 373                 .ioctl          = snd_pcm_lib_ioctl,
 374                 .hw_params      = pcm_hw_params,
 375                 .hw_free        = pcm_hw_free,
 376                 .prepare        = pcm_capture_prepare,
 377                 .trigger        = pcm_capture_trigger,
 378                 .pointer        = pcm_capture_pointer,
 379                 .ack            = pcm_capture_ack,
 380                 .page           = snd_pcm_lib_get_vmalloc_page,
 381         };
 382         static const struct snd_pcm_ops pcm_playback_ops = {
 383                 .open           = pcm_open,
 384                 .close          = pcm_close,
 385                 .ioctl          = snd_pcm_lib_ioctl,
 386                 .hw_params      = pcm_hw_params,
 387                 .hw_free        = pcm_hw_free,
 388                 .prepare        = pcm_playback_prepare,
 389                 .trigger        = pcm_playback_trigger,
 390                 .pointer        = pcm_playback_pointer,
 391                 .ack            = pcm_playback_ack,
 392                 .page           = snd_pcm_lib_get_vmalloc_page,
 393         };
 394         struct snd_pcm *pcm;
 395         int err;
 396
 397         err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm);
 398         if (err < 0)
 399                 return err;
 400
 401         pcm->private_data = ff;
 402         snprintf(pcm->name, sizeof(pcm->name),
 403                  "%s PCM", ff->card->shortname);
 404         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 405         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 406
 407         return 0;
 408 }