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 = AMDTP_IN_PCM_FORMAT_BITS;
 126                 s = &bebob->tx_stream;
 127                 formations = bebob->tx_stream_formations;
 128         } else {
 129                 runtime->hw.formats = AMDTP_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_stream_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         unsigned int sampling_rate;
 159         bool internal;
 160         int err;
 161
 162         err = pcm_init_hw_params(bebob, substream);
 163         if (err < 0)
 164                 goto end;
 165
 166         err = snd_bebob_stream_check_internal_clock(bebob, &internal);
 167         if (err < 0)
 168                 goto end;
 169
 170         /*
 171          * When source of clock is internal or any PCM stream are running,
 172          * the available sampling rate is limited at current sampling rate.
 173          */
 174         if (!internal ||
 175             amdtp_stream_pcm_running(&bebob->tx_stream) ||
 176             amdtp_stream_pcm_running(&bebob->rx_stream)) {
 177                 err = snd_bebob_stream_get_rate(bebob, &sampling_rate);
 178                 if (err < 0) {
 179                         dev_err(&bebob->unit->device,
 180                                 "fail to get sampling rate: %d\n", err);
 181                         goto end;
 182                 }
 183
 184                 substream->runtime->hw.rate_min = sampling_rate;
 185                 substream->runtime->hw.rate_max = sampling_rate;
 186         }
 187
 188         snd_pcm_set_sync(substream);
 189
 190 end:
 191         return err;
 192 }
 193
 194 static int
 195 pcm_close(struct snd_pcm_substream *substream)
 196 {
 197         return 0;
 198 }
 199
 200 static int
 201 pcm_capture_hw_params(struct snd_pcm_substream *substream,
 202                       struct snd_pcm_hw_params *hw_params)
 203 {
 204         struct snd_bebob *bebob = substream->private_data;
 205
 206         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 207                 atomic_inc(&bebob->capture_substreams);
 208         amdtp_stream_set_pcm_format(&bebob->tx_stream,
 209                                     params_format(hw_params));
 210         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 211                                                 params_buffer_bytes(hw_params));
 212 }
 213 static int
 214 pcm_playback_hw_params(struct snd_pcm_substream *substream,
 215                        struct snd_pcm_hw_params *hw_params)
 216 {
 217         struct snd_bebob *bebob = substream->private_data;
 218
 219         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 220                 atomic_inc(&bebob->playback_substreams);
 221         amdtp_stream_set_pcm_format(&bebob->rx_stream,
 222                                     params_format(hw_params));
 223         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 224                                                 params_buffer_bytes(hw_params));
 225 }
 226
 227 static int
 228 pcm_capture_hw_free(struct snd_pcm_substream *substream)
 229 {
 230         struct snd_bebob *bebob = substream->private_data;
 231
 232         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 233                 atomic_dec(&bebob->capture_substreams);
 234
 235         snd_bebob_stream_stop_duplex(bebob);
 236
 237         return snd_pcm_lib_free_vmalloc_buffer(substream);
 238 }
 239 static int
 240 pcm_playback_hw_free(struct snd_pcm_substream *substream)
 241 {
 242         struct snd_bebob *bebob = substream->private_data;
 243
 244         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 245                 atomic_dec(&bebob->playback_substreams);
 246
 247         snd_bebob_stream_stop_duplex(bebob);
 248
 249         return snd_pcm_lib_free_vmalloc_buffer(substream);
 250 }
 251
 252 static int
 253 pcm_capture_prepare(struct snd_pcm_substream *substream)
 254 {
 255         struct snd_bebob *bebob = substream->private_data;
 256         struct snd_pcm_runtime *runtime = substream->runtime;
 257         int err;
 258
 259         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 260         if (err >= 0)
 261                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
 262
 263         return err;
 264 }
 265 static int
 266 pcm_playback_prepare(struct snd_pcm_substream *substream)
 267 {
 268         struct snd_bebob *bebob = substream->private_data;
 269         struct snd_pcm_runtime *runtime = substream->runtime;
 270         int err;
 271
 272         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 273         if (err >= 0)
 274                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
 275
 276         return err;
 277 }
 278
 279 static int
 280 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 281 {
 282         struct snd_bebob *bebob = substream->private_data;
 283
 284         switch (cmd) {
 285         case SNDRV_PCM_TRIGGER_START:
 286                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
 287                 break;
 288         case SNDRV_PCM_TRIGGER_STOP:
 289                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
 290                 break;
 291         default:
 292                 return -EINVAL;
 293         }
 294
 295         return 0;
 296 }
 297 static int
 298 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 299 {
 300         struct snd_bebob *bebob = substream->private_data;
 301
 302         switch (cmd) {
 303         case SNDRV_PCM_TRIGGER_START:
 304                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
 305                 break;
 306         case SNDRV_PCM_TRIGGER_STOP:
 307                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
 308                 break;
 309         default:
 310                 return -EINVAL;
 311         }
 312
 313         return 0;
 314 }
 315
 316 static snd_pcm_uframes_t
 317 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 318 {
 319         struct snd_bebob *bebob = sbstrm->private_data;
 320         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
 321 }
 322 static snd_pcm_uframes_t
 323 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 324 {
 325         struct snd_bebob *bebob = sbstrm->private_data;
 326         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
 327 }
 328
 329 static const struct snd_pcm_ops pcm_capture_ops = {
 330         .open           = pcm_open,
 331         .close          = pcm_close,
 332         .ioctl          = snd_pcm_lib_ioctl,
 333         .hw_params      = pcm_capture_hw_params,
 334         .hw_free        = pcm_capture_hw_free,
 335         .prepare        = pcm_capture_prepare,
 336         .trigger        = pcm_capture_trigger,
 337         .pointer        = pcm_capture_pointer,
 338         .page           = snd_pcm_lib_get_vmalloc_page,
 339 };
 340 static const struct snd_pcm_ops pcm_playback_ops = {
 341         .open           = pcm_open,
 342         .close          = pcm_close,
 343         .ioctl          = snd_pcm_lib_ioctl,
 344         .hw_params      = pcm_playback_hw_params,
 345         .hw_free        = pcm_playback_hw_free,
 346         .prepare        = pcm_playback_prepare,
 347         .trigger        = pcm_playback_trigger,
 348         .pointer        = pcm_playback_pointer,
 349         .page           = snd_pcm_lib_get_vmalloc_page,
 350         .mmap           = snd_pcm_lib_mmap_vmalloc,
 351 };
 352
 353 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
 354 {
 355         struct snd_pcm *pcm;
 356         int err;
 357
 358         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
 359         if (err < 0)
 360                 goto end;
 361
 362         pcm->private_data = bebob;
 363         snprintf(pcm->name, sizeof(pcm->name),
 364                  "%s PCM", bebob->card->shortname);
 365         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 366         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 367 end:
 368         return err;
 369 }