kernel/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         struct snd_bebob_rate_spec *spec = bebob->spec->rate;
 159         unsigned int sampling_rate;
 160         bool internal;
 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_check_internal_clock(bebob, &internal);
 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 (!internal ||
 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
 215         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 216                 atomic_inc(&bebob->capture_substreams);
 217         amdtp_stream_set_pcm_format(&bebob->tx_stream,
 218                                     params_format(hw_params));
 219         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 220                                                 params_buffer_bytes(hw_params));
 221 }
 222 static int
 223 pcm_playback_hw_params(struct snd_pcm_substream *substream,
 224                        struct snd_pcm_hw_params *hw_params)
 225 {
 226         struct snd_bebob *bebob = substream->private_data;
 227
 228         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 229                 atomic_inc(&bebob->playback_substreams);
 230         amdtp_stream_set_pcm_format(&bebob->rx_stream,
 231                                     params_format(hw_params));
 232         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 233                                                 params_buffer_bytes(hw_params));
 234 }
 235
 236 static int
 237 pcm_capture_hw_free(struct snd_pcm_substream *substream)
 238 {
 239         struct snd_bebob *bebob = substream->private_data;
 240
 241         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 242                 atomic_dec(&bebob->capture_substreams);
 243
 244         snd_bebob_stream_stop_duplex(bebob);
 245
 246         return snd_pcm_lib_free_vmalloc_buffer(substream);
 247 }
 248 static int
 249 pcm_playback_hw_free(struct snd_pcm_substream *substream)
 250 {
 251         struct snd_bebob *bebob = substream->private_data;
 252
 253         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 254                 atomic_dec(&bebob->playback_substreams);
 255
 256         snd_bebob_stream_stop_duplex(bebob);
 257
 258         return snd_pcm_lib_free_vmalloc_buffer(substream);
 259 }
 260
 261 static int
 262 pcm_capture_prepare(struct snd_pcm_substream *substream)
 263 {
 264         struct snd_bebob *bebob = substream->private_data;
 265         struct snd_pcm_runtime *runtime = substream->runtime;
 266         int err;
 267
 268         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 269         if (err >= 0)
 270                 amdtp_stream_pcm_prepare(&bebob->tx_stream);
 271
 272         return err;
 273 }
 274 static int
 275 pcm_playback_prepare(struct snd_pcm_substream *substream)
 276 {
 277         struct snd_bebob *bebob = substream->private_data;
 278         struct snd_pcm_runtime *runtime = substream->runtime;
 279         int err;
 280
 281         err = snd_bebob_stream_start_duplex(bebob, runtime->rate);
 282         if (err >= 0)
 283                 amdtp_stream_pcm_prepare(&bebob->rx_stream);
 284
 285         return err;
 286 }
 287
 288 static int
 289 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 290 {
 291         struct snd_bebob *bebob = substream->private_data;
 292
 293         switch (cmd) {
 294         case SNDRV_PCM_TRIGGER_START:
 295                 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream);
 296                 break;
 297         case SNDRV_PCM_TRIGGER_STOP:
 298                 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL);
 299                 break;
 300         default:
 301                 return -EINVAL;
 302         }
 303
 304         return 0;
 305 }
 306 static int
 307 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 308 {
 309         struct snd_bebob *bebob = substream->private_data;
 310
 311         switch (cmd) {
 312         case SNDRV_PCM_TRIGGER_START:
 313                 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream);
 314                 break;
 315         case SNDRV_PCM_TRIGGER_STOP:
 316                 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL);
 317                 break;
 318         default:
 319                 return -EINVAL;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static snd_pcm_uframes_t
 326 pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 327 {
 328         struct snd_bebob *bebob = sbstrm->private_data;
 329         return amdtp_stream_pcm_pointer(&bebob->tx_stream);
 330 }
 331 static snd_pcm_uframes_t
 332 pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 333 {
 334         struct snd_bebob *bebob = sbstrm->private_data;
 335         return amdtp_stream_pcm_pointer(&bebob->rx_stream);
 336 }
 337
 338 static const struct snd_pcm_ops pcm_capture_ops = {
 339         .open           = pcm_open,
 340         .close          = pcm_close,
 341         .ioctl          = snd_pcm_lib_ioctl,
 342         .hw_params      = pcm_capture_hw_params,
 343         .hw_free        = pcm_capture_hw_free,
 344         .prepare        = pcm_capture_prepare,
 345         .trigger        = pcm_capture_trigger,
 346         .pointer        = pcm_capture_pointer,
 347         .page           = snd_pcm_lib_get_vmalloc_page,
 348 };
 349 static const struct snd_pcm_ops pcm_playback_ops = {
 350         .open           = pcm_open,
 351         .close          = pcm_close,
 352         .ioctl          = snd_pcm_lib_ioctl,
 353         .hw_params      = pcm_playback_hw_params,
 354         .hw_free        = pcm_playback_hw_free,
 355         .prepare        = pcm_playback_prepare,
 356         .trigger        = pcm_playback_trigger,
 357         .pointer        = pcm_playback_pointer,
 358         .page           = snd_pcm_lib_get_vmalloc_page,
 359         .mmap           = snd_pcm_lib_mmap_vmalloc,
 360 };
 361
 362 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob)
 363 {
 364         struct snd_pcm *pcm;
 365         int err;
 366
 367         err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm);
 368         if (err < 0)
 369                 goto end;
 370
 371         pcm->private_data = bebob;
 372         snprintf(pcm->name, sizeof(pcm->name),
 373                  "%s PCM", bebob->card->shortname);
 374         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops);
 375         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops);
 376 end:
 377         return err;
 378 }