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         enum snd_motu_clock_source src;
 138         unsigned int rate;
 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         /*
 156          * When source of clock is not internal or any PCM streams are running,
 157          * available sampling rate is limited at current sampling rate.
 158          */
 159         err = protocol->get_clock_source(motu, &src);
 160         if (err < 0)
 161                 goto err_locked;
 162         if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL ||
 163             amdtp_stream_pcm_running(&motu->tx_stream) ||
 164             amdtp_stream_pcm_running(&motu->rx_stream)) {
 165                 err = protocol->get_clock_rate(motu, &rate);
 166                 if (err < 0)
 167                         goto err_locked;
 168                 substream->runtime->hw.rate_min = rate;
 169                 substream->runtime->hw.rate_max = rate;
 170         }
 171
 172         snd_pcm_set_sync(substream);
 173
 174         mutex_unlock(&motu->mutex);
 175
 176         return err;
 177 err_locked:
 178         mutex_unlock(&motu->mutex);
 179         snd_motu_stream_lock_release(motu);
 180         return err;
 181 }
 182
 183 static int pcm_close(struct snd_pcm_substream *substream)
 184 {
 185         struct snd_motu *motu = substream->private_data;
 186
 187         snd_motu_stream_lock_release(motu);
 188
 189         return 0;
 190 }
 191
 192 static int capture_hw_params(struct snd_pcm_substream *substream,
 193                              struct snd_pcm_hw_params *hw_params)
 194 {
 195         struct snd_motu *motu = substream->private_data;
 196         int err;
 197
 198         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 199                                                params_buffer_bytes(hw_params));
 200         if (err < 0)
 201                 return err;
 202
 203         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 204                 mutex_lock(&motu->mutex);
 205                 motu->capture_substreams++;
 206                 mutex_unlock(&motu->mutex);
 207         }
 208
 209         return 0;
 210 }
 211 static int playback_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;
 216
 217         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 218                                                params_buffer_bytes(hw_params));
 219         if (err < 0)
 220                 return err;
 221
 222         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 223                 mutex_lock(&motu->mutex);
 224                 motu->playback_substreams++;
 225                 mutex_unlock(&motu->mutex);
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int capture_hw_free(struct snd_pcm_substream *substream)
 232 {
 233         struct snd_motu *motu = substream->private_data;
 234
 235         mutex_lock(&motu->mutex);
 236
 237         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 238                 motu->capture_substreams--;
 239
 240         snd_motu_stream_stop_duplex(motu);
 241
 242         mutex_unlock(&motu->mutex);
 243
 244         return snd_pcm_lib_free_vmalloc_buffer(substream);
 245 }
 246
 247 static int playback_hw_free(struct snd_pcm_substream *substream)
 248 {
 249         struct snd_motu *motu = substream->private_data;
 250
 251         mutex_lock(&motu->mutex);
 252
 253         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 254                 motu->playback_substreams--;
 255
 256         snd_motu_stream_stop_duplex(motu);
 257
 258         mutex_unlock(&motu->mutex);
 259
 260         return snd_pcm_lib_free_vmalloc_buffer(substream);
 261 }
 262
 263 static int capture_prepare(struct snd_pcm_substream *substream)
 264 {
 265         struct snd_motu *motu = substream->private_data;
 266         int err;
 267
 268         mutex_lock(&motu->mutex);
 269         err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
 270         mutex_unlock(&motu->mutex);
 271         if (err >= 0)
 272                 amdtp_stream_pcm_prepare(&motu->tx_stream);
 273
 274         return 0;
 275 }
 276 static int playback_prepare(struct snd_pcm_substream *substream)
 277 {
 278         struct snd_motu *motu = substream->private_data;
 279         int err;
 280
 281         mutex_lock(&motu->mutex);
 282         err = snd_motu_stream_start_duplex(motu, substream->runtime->rate);
 283         mutex_unlock(&motu->mutex);
 284         if (err >= 0)
 285                 amdtp_stream_pcm_prepare(&motu->rx_stream);
 286
 287         return err;
 288 }
 289
 290 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
 291 {
 292         struct snd_motu *motu = substream->private_data;
 293
 294         switch (cmd) {
 295         case SNDRV_PCM_TRIGGER_START:
 296                 amdtp_stream_pcm_trigger(&motu->tx_stream, substream);
 297                 break;
 298         case SNDRV_PCM_TRIGGER_STOP:
 299                 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL);
 300                 break;
 301         default:
 302                 return -EINVAL;
 303         }
 304
 305         return 0;
 306 }
 307 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
 308 {
 309         struct snd_motu *motu = substream->private_data;
 310
 311         switch (cmd) {
 312         case SNDRV_PCM_TRIGGER_START:
 313                 amdtp_stream_pcm_trigger(&motu->rx_stream, substream);
 314                 break;
 315         case SNDRV_PCM_TRIGGER_STOP:
 316                 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL);
 317                 break;
 318         default:
 319                 return -EINVAL;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
 326 {
 327         struct snd_motu *motu = substream->private_data;
 328
 329         return amdtp_stream_pcm_pointer(&motu->tx_stream);
 330 }
 331 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
 332 {
 333         struct snd_motu *motu = substream->private_data;
 334
 335         return amdtp_stream_pcm_pointer(&motu->rx_stream);
 336 }
 337
 338 static int capture_ack(struct snd_pcm_substream *substream)
 339 {
 340         struct snd_motu *motu = substream->private_data;
 341
 342         return amdtp_stream_pcm_ack(&motu->tx_stream);
 343 }
 344
 345 static int playback_ack(struct snd_pcm_substream *substream)
 346 {
 347         struct snd_motu *motu = substream->private_data;
 348
 349         return amdtp_stream_pcm_ack(&motu->rx_stream);
 350 }
 351
 352 int snd_motu_create_pcm_devices(struct snd_motu *motu)
 353 {
 354         static const struct snd_pcm_ops capture_ops = {
 355                 .open      = pcm_open,
 356                 .close     = pcm_close,
 357                 .ioctl     = snd_pcm_lib_ioctl,
 358                 .hw_params = capture_hw_params,
 359                 .hw_free   = capture_hw_free,
 360                 .prepare   = capture_prepare,
 361                 .trigger   = capture_trigger,
 362                 .pointer   = capture_pointer,
 363                 .ack       = capture_ack,
 364                 .page      = snd_pcm_lib_get_vmalloc_page,
 365         };
 366         static const struct snd_pcm_ops playback_ops = {
 367                 .open      = pcm_open,
 368                 .close     = pcm_close,
 369                 .ioctl     = snd_pcm_lib_ioctl,
 370                 .hw_params = playback_hw_params,
 371                 .hw_free   = playback_hw_free,
 372                 .prepare   = playback_prepare,
 373                 .trigger   = playback_trigger,
 374                 .pointer   = playback_pointer,
 375                 .ack       = playback_ack,
 376                 .page      = snd_pcm_lib_get_vmalloc_page,
 377         };
 378         struct snd_pcm *pcm;
 379         int err;
 380
 381         err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm);
 382         if (err < 0)
 383                 return err;
 384         pcm->private_data = motu;
 385         strcpy(pcm->name, motu->card->shortname);
 386
 387         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 388         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 389
 390         return 0;
 391 }