sound/firewire/bebob/bebob_pcm.c

   1 /*
   2  * bebob_pcm.c - a part of driver for BeBoB based devices
   3  *
   4  * Copyright (c) 2013-2014 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "./bebob.h"
  10
  11 static int
  12 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
  13 {
  14         struct snd_bebob_stream_formation *formations = rule->private;
  15         struct snd_interval *r =
  16                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
  17         const struct snd_interval *c =
  18                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  19         struct snd_interval t = {
  20                 .min = UINT_MAX, .max = 0, .integer = 1
  21         };
  22         unsigned int i;
  23
  24         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
  25                 /* entry is invalid */
  26                 if (formations[i].pcm == 0)
  27                         continue;
  28
  29                 if (!snd_interval_test(c, formations[i].pcm))
  30                         continue;
  31
  32                 t.min = min(t.min, snd_bebob_rate_table[i]);
  33                 t.max = max(t.max, snd_bebob_rate_table[i]);
  34
  35         }
  36         return snd_interval_refine(r, &t);
  37 }
  38
  39 static int
  40 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
  41 {
  42         struct snd_bebob_stream_formation *formations = rule->private;
  43         struct snd_interval *c =
  44                 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
  45         const struct snd_interval *r =
  46                 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
  47         struct snd_interval t = {
  48                 .min = UINT_MAX, .max = 0, .integer = 1
  49         };
  50
  51         unsigned int i;
  52
  53         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
  54                 /* entry is invalid */
  55                 if (formations[i].pcm == 0)
  56                         continue;
  57
  58                 if (!snd_interval_test(r, snd_bebob_rate_table[i]))
  59                         continue;
  60
  61                 t.min = min(t.min, formations[i].pcm);
  62                 t.max = max(t.max, formations[i].pcm);
  63         }
  64
  65         return snd_interval_refine(c, &t);
  66 }
  67
  68 static void
  69 limit_channels_and_rates(struct snd_pcm_hardware *hw,
  70                          struct snd_bebob_stream_formation *formations)
  71 {
  72         unsigned int i;
  73
  74         hw->channels_min = UINT_MAX;
  75         hw->channels_max = 0;
  76
  77         hw->rate_min = UINT_MAX;
  78         hw->rate_max = 0;
  79         hw->rates = 0;
  80
  81         for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) {
  82                 /* entry has no PCM channels */
  83                 if (formations[i].pcm == 0)
  84                         continue;
  85
  86                 hw->channels_min = min(hw->channels_min, formations[i].pcm);
  87                 hw->channels_max = max(hw->channels_max, formations[i].pcm);
  88
  89                 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]);
  90                 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]);
  91                 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]);
  92         }
  93 }
  94
  95 static void
  96 limit_period_and_buffer(struct snd_pcm_hardware *hw)
  97 {
  98         hw->periods_min = 2;            /* SNDRV_PCM_INFO_BATCH */
  99         hw->periods_max = UINT_MAX;
 100
 101         hw->period_bytes_min = 4 * hw->channels_max;    /* bytes for a frame */
 102
 103         /* Just to prevent from allocating much pages. */
 104         hw->period_bytes_max = hw->period_bytes_min * 2048;
 105         hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
 106 }
 107
 108 static int
 109 pcm_init_hw_params(struct snd_bebob *bebob,
 110                    struct snd_pcm_substream *substream)
 111 {
 112         struct snd_pcm_runtime *runtime = substream->runtime;
 113         struct amdtp_stream *s;
 114         struct snd_bebob_stream_formation *formations;
 115         int err;
 116
 117         runtime->hw.info = SNDRV_PCM_INFO_BATCH |
 118                            SNDRV_PCM_INFO_BLOCK_TRANSFER |
 119                            SNDRV_PCM_INFO_INTERLEAVED |
 120                            SNDRV_PCM_INFO_JOINT_DUPLEX |
 121                            SNDRV_PCM_INFO_MMAP |
 122                            SNDRV_PCM_INFO_MMAP_VALID;
 123
 124         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 125                 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS;
 126                 s = &bebob->tx_stream;
 127                 formations = bebob->tx_stream_formations;
 128         } else {
 129                 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS;
 130                 s = &bebob->rx_stream;
 131                 formations = bebob->rx_stream_formations;
 132         }
 133
 134         limit_channels_and_rates(&runtime->hw, formations);
 135         limit_period_and_buffer(&runtime->hw);
 136
 137         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
 138                                   hw_rule_channels, formations,
 139                                   SNDRV_PCM_HW_PARAM_RATE, -1);
 140         if (err < 0)
 141                 goto end;
 142
 143         err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 144                                   hw_rule_rate, formations,
 145                                   SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 146         if (err < 0)
 147                 goto end;
 148
 149         err = amdtp_am824_add_pcm_hw_constraints(s, runtime);
 150 end:
 151         return err;
 152 }
 153
 154 static int
 155 pcm_open(struct snd_pcm_substream *substream)
 156 {
 157         struct snd_bebob *bebob = substream->private_data;
 158         const struct snd_bebob_rate_spec *spec = bebob->spec->rate;
 159         unsigned int sampling_rate;
 160         enum snd_bebob_clock_type src;
 161         int err;
 162
 163         err = snd_bebob_stream_lock_try(bebob);
 164         if (err < 0)
 165                 goto end;
 166
 167         err = pcm_init_hw_params(bebob, substream);
 168         if (err < 0)
 169                 goto err_locked;
 170
 171         err = snd_bebob_stream_get_clock_src(bebob, &src);
 172         if (err < 0)
 173                 goto err_locked;
 174
 175         /*
 176          * When source of clock is internal or any PCM stream are running,
 177          * the available sampling rate is limited at current sampling rate.
 178          */
 179         if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL ||
 180             amdtp_stream_pcm_running(&bebob->tx_stream) ||
 181             amdtp_stream_pcm_running(&bebob->rx_stream)) {
 182                 err = spec->get(bebob, &sampling_rate);
 183                 if (err < 0) {
 184                         dev_err(&bebob->unit->device,
 185                                 "fail to get sampling rate: %d\n", err);
 186                         goto err_locked;
 187                 }
 188
 189                 substream->runtime->hw.rate_min = sampling_rate;
 190                 substream->runtime->hw.rate_max = sampling_rate;
 191         }
 192
 193         snd_pcm_set_sync(substream);
 194 end:
 195         return err;
 196 err_locked:
 197         snd_bebob_stream_lock_release(bebob);
 198         return err;
 199 }
 200
 201 static int
 202 pcm_close(struct snd_pcm_substream *substream)
 203 {
 204         struct snd_bebob *bebob = substream->private_data;
 205         snd_bebob_stream_lock_release(bebob);
 206         return 0;
 207 }
 208
 209 static int
 210 pcm_capture_hw_params(struct snd_pcm_substream *substream,
 211                       struct snd_pcm_hw_params *hw_params)
 212 {
 213         struct snd_bebob *bebob = substream->private_data;
 214         int err;
 215
 216         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 217                                                params_buffer_bytes(hw_params));
 218         if (err < 0)
 219                 return err;
 220
 221         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 222                 mutex_lock(&bebob->mutex);
 223                 bebob->substreams_counter++;
 224                 mutex_unlock(&bebob->mutex);
 225         }
 226
 227         return 0;
 228 }
 229 static int
 230 pcm_playback_hw_params(struct snd_pcm_substream *substream,
 231                        struct snd_pcm_hw_params *hw_params)
 232 {
 233         struct snd_bebob *bebob = substream->private_data;
 234         int err;
 235
 236         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 237                                                params_buffer_bytes(hw_params));
 238         if (err < 0)
 239                 return err;
 240
 241         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 242                 mutex_lock(&bebob->mutex);
 243                 bebob->substreams_counter++;
 244                 mutex_unlock(&bebob->mutex);
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int
 251 pcm_capture_hw_free(struct snd_pcm_substream *substream)
 252 {
 253         struct snd_bebob *bebob = substream->private_data;
 254
 255         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 256                 mutex_lock(&bebob->mutex);
 257                 bebob->substreams_counter--;
 258                 mutex_unlock(&bebob->mutex);
 259         }
 260
 261         snd_bebob_stream_stop_duplex(bebob);
 262
 263         return snd_pcm_lib_free_vmalloc_buffer(substream);
 264 }
 265 static int
 266 pcm_playback_hw_free(struct snd_pcm_substream *substream)
 267 {
 268         struct snd_bebob *bebob = substream->private_data;
 269
 270         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 271                 mutex_lock(&bebob->mutex);
 272                 bebob->substreams_counter--;
 273                 mutex_unlock(&bebob->mutex);
 274         }
 275
 276         snd_bebob_stream_stop_duplex(bebob);
 277
 278         return snd_pcm_lib_free_vmalloc_buffer(substream);
 279 }
 280
 281 static int
 282 pcm_capture_prepare(struct snd_pcm_substream *substream)
 283 {
 284         struct snd_bebob *bebob = substream->private_data;
 285         struct snd_pcm_runtime *runtime = substream->runtime;
 286         int err;
 287
 288         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 289         if (err >= 0)
 290                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
 291
 292         return err;
 293 }
 294 static int
 295 pcm_playback_prepare(struct snd_pcm_substream *substream)
 296 {
 297         struct snd_bebob *bebob = substream->private_data;
 298         struct snd_pcm_runtime *runtime = substream->runtime;
 299         int err;
 300
 301         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 302         if (err >= 0)
 303                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
 304
 305         return err;
 306 }
 307
 308 static int
 309 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 310 {
 311         struct snd_bebob *bebob = substream->private_data;
 312
 313         switch (cmd) {
 314         case SNDRV_PCM_TRIGGER_START:
 315                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
 316                 break;
 317         case SNDRV_PCM_TRIGGER_STOP:
 318                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
 319                 break;
 320         default:
 321                 return -EINVAL;
 322         }
 323
 324         return 0;
 325 }
 326 static int
 327 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 328 {
 329         struct snd_bebob *bebob = substream->private_data;
 330
 331         switch (cmd) {
 332         case SNDRV_PCM_TRIGGER_START:
 333                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
 334                 break;
 335         case SNDRV_PCM_TRIGGER_STOP:
 336                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
 337                 break;
 338         default:
 339                 return -EINVAL;
 340         }
 341
 342         return 0;
 343 }
 344
 345 static snd_pcm_uframes_t
 346 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 347 {
 348         struct snd_bebob *bebob = sbstrm->private_data;
 349         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
 350 }
 351 static snd_pcm_uframes_t
 352 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 353 {
 354         struct snd_bebob *bebob = sbstrm->private_data;
 355         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
 356 }
 357
 358 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
 359 {
 360         static const struct snd_pcm_ops capture_ops = {
 361                 .open           = pcm_open,
 362                 .close          = pcm_close,
 363                 .ioctl          = snd_pcm_lib_ioctl,
 364                 .hw_params      = pcm_capture_hw_params,
 365                 .hw_free        = pcm_capture_hw_free,
 366                 .prepare        = pcm_capture_prepare,
 367                 .trigger        = pcm_capture_trigger,
 368                 .pointer        = pcm_capture_pointer,
 369                 .page           = snd_pcm_lib_get_vmalloc_page,
 370         };
 371         static const struct snd_pcm_ops playback_ops = {
 372                 .open           = pcm_open,
 373                 .close          = pcm_close,
 374                 .ioctl          = snd_pcm_lib_ioctl,
 375                 .hw_params      = pcm_playback_hw_params,
 376                 .hw_free        = pcm_playback_hw_free,
 377                 .prepare        = pcm_playback_prepare,
 378                 .trigger        = pcm_playback_trigger,
 379                 .pointer        = pcm_playback_pointer,
 380                 .page           = snd_pcm_lib_get_vmalloc_page,
 381                 .mmap           = snd_pcm_lib_mmap_vmalloc,
 382         };
 383         struct snd_pcm *pcm;
 384         int err;
 385
 386         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
 387         if (err < 0)
 388                 goto end;
 389
 390         pcm->private_data = bebob;
 391         snprintf(pcm->name, sizeof(pcm->name),
 392                  "%s PCM", bebob->card->shortname);
 393         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 394         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 395 end:
 396         return err;
 397 }