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         amdtp_am824_set_pcm_format(&bebob->tx_stream, params_format(hw_params));
 228
 229         return 0;
 230 }
 231 static int
 232 pcm_playback_hw_params(struct snd_pcm_substream *substream,
 233                        struct snd_pcm_hw_params *hw_params)
 234 {
 235         struct snd_bebob *bebob = substream->private_data;
 236         int err;
 237
 238         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 239                                                params_buffer_bytes(hw_params));
 240         if (err < 0)
 241                 return err;
 242
 243         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 244                 mutex_lock(&bebob->mutex);
 245                 bebob->substreams_counter++;
 246                 mutex_unlock(&bebob->mutex);
 247         }
 248
 249         amdtp_am824_set_pcm_format(&bebob->rx_stream, params_format(hw_params));
 250
 251         return 0;
 252 }
 253
 254 static int
 255 pcm_capture_hw_free(struct snd_pcm_substream *substream)
 256 {
 257         struct snd_bebob *bebob = substream->private_data;
 258
 259         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 260                 mutex_lock(&bebob->mutex);
 261                 bebob->substreams_counter--;
 262                 mutex_unlock(&bebob->mutex);
 263         }
 264
 265         snd_bebob_stream_stop_duplex(bebob);
 266
 267         return snd_pcm_lib_free_vmalloc_buffer(substream);
 268 }
 269 static int
 270 pcm_playback_hw_free(struct snd_pcm_substream *substream)
 271 {
 272         struct snd_bebob *bebob = substream->private_data;
 273
 274         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
 275                 mutex_lock(&bebob->mutex);
 276                 bebob->substreams_counter--;
 277                 mutex_unlock(&bebob->mutex);
 278         }
 279
 280         snd_bebob_stream_stop_duplex(bebob);
 281
 282         return snd_pcm_lib_free_vmalloc_buffer(substream);
 283 }
 284
 285 static int
 286 pcm_capture_prepare(struct snd_pcm_substream *substream)
 287 {
 288         struct snd_bebob *bebob = substream->private_data;
 289         struct snd_pcm_runtime *runtime = substream->runtime;
 290         int err;
 291
 292         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 293         if (err >= 0)
 294                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
 295
 296         return err;
 297 }
 298 static int
 299 pcm_playback_prepare(struct snd_pcm_substream *substream)
 300 {
 301         struct snd_bebob *bebob = substream->private_data;
 302         struct snd_pcm_runtime *runtime = substream->runtime;
 303         int err;
 304
 305         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 306         if (err >= 0)
 307                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
 308
 309         return err;
 310 }
 311
 312 static int
 313 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 314 {
 315         struct snd_bebob *bebob = substream->private_data;
 316
 317         switch (cmd) {
 318         case SNDRV_PCM_TRIGGER_START:
 319                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
 320                 break;
 321         case SNDRV_PCM_TRIGGER_STOP:
 322                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
 323                 break;
 324         default:
 325                 return -EINVAL;
 326         }
 327
 328         return 0;
 329 }
 330 static int
 331 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 332 {
 333         struct snd_bebob *bebob = substream->private_data;
 334
 335         switch (cmd) {
 336         case SNDRV_PCM_TRIGGER_START:
 337                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
 338                 break;
 339         case SNDRV_PCM_TRIGGER_STOP:
 340                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
 341                 break;
 342         default:
 343                 return -EINVAL;
 344         }
 345
 346         return 0;
 347 }
 348
 349 static snd_pcm_uframes_t
 350 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 351 {
 352         struct snd_bebob *bebob = sbstrm->private_data;
 353         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
 354 }
 355 static snd_pcm_uframes_t
 356 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 357 {
 358         struct snd_bebob *bebob = sbstrm->private_data;
 359         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
 360 }
 361
 362 static const struct snd_pcm_ops pcm_capture_ops = {
 363         .open           = pcm_open,
 364         .close          = pcm_close,
 365         .ioctl          = snd_pcm_lib_ioctl,
 366         .hw_params      = pcm_capture_hw_params,
 367         .hw_free        = pcm_capture_hw_free,
 368         .prepare        = pcm_capture_prepare,
 369         .trigger        = pcm_capture_trigger,
 370         .pointer        = pcm_capture_pointer,
 371         .page           = snd_pcm_lib_get_vmalloc_page,
 372 };
 373 static const struct snd_pcm_ops pcm_playback_ops = {
 374         .open           = pcm_open,
 375         .close          = pcm_close,
 376         .ioctl          = snd_pcm_lib_ioctl,
 377         .hw_params      = pcm_playback_hw_params,
 378         .hw_free        = pcm_playback_hw_free,
 379         .prepare        = pcm_playback_prepare,
 380         .trigger        = pcm_playback_trigger,
 381         .pointer        = pcm_playback_pointer,
 382         .page           = snd_pcm_lib_get_vmalloc_page,
 383         .mmap           = snd_pcm_lib_mmap_vmalloc,
 384 };
 385
 386 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
 387 {
 388         struct snd_pcm *pcm;
 389         int err;
 390
 391         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
 392         if (err < 0)
 393                 goto end;
 394
 395         pcm->private_data = bebob;
 396         snprintf(pcm->name, sizeof(pcm->name),
 397                  "%s PCM", bebob->card->shortname);
 398         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 399         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 400 end:
 401         return err;
 402 }