sound/firewire/dice/dice-pcm.c

   1 /*
   2  * dice_pcm.c - a part of driver for DICE based devices
   3  *
   4  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
   5  * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp>
   6  *
   7  * Licensed under the terms of the GNU General Public License, version 2.
   8  */
   9
  10 #include "dice.h"
  11
  12 static int limit_channels_and_rates(struct snd_dice *dice,
  13                                     struct snd_pcm_runtime *runtime,
  14                                     enum amdtp_stream_direction dir,
  15                                     unsigned int index, unsigned int size)
  16 {
  17         struct snd_pcm_hardware *hw = &runtime->hw;
  18         struct amdtp_stream *stream;
  19         unsigned int rate;
  20         __be32 reg;
  21         int err;
  22
  23         /*
  24          * Retrieve current Multi Bit Linear Audio data channel and limit to
  25          * it.
  26          */
  27         if (dir == AMDTP_IN_STREAM) {
  28                 stream = &dice->tx_stream[index];
  29                 err = snd_dice_transaction_read_tx(dice,
  30                                 size * index + TX_NUMBER_AUDIO,
  31                                 &reg, sizeof(reg));
  32         } else {
  33                 stream = &dice->rx_stream[index];
  34                 err = snd_dice_transaction_read_rx(dice,
  35                                 size * index + RX_NUMBER_AUDIO,
  36                                 &reg, sizeof(reg));
  37         }
  38         if (err < 0)
  39                 return err;
  40
  41         hw->channels_min = hw->channels_max = be32_to_cpu(reg);
  42
  43         /* Retrieve current sampling transfer frequency and limit to it. */
  44         err = snd_dice_transaction_get_rate(dice, &rate);
  45         if (err < 0)
  46                 return err;
  47
  48         hw->rates = snd_pcm_rate_to_rate_bit(rate);
  49         snd_pcm_limit_hw_rates(runtime);
  50
  51         return 0;
  52 }
  53
  54 static void limit_period_and_buffer(struct snd_pcm_hardware *hw)
  55 {
  56         hw->periods_min = 2;                    /* SNDRV_PCM_INFO_BATCH */
  57         hw->periods_max = UINT_MAX;
  58
  59         hw->period_bytes_min = 4 * hw->channels_max;    /* byte for a frame */
  60
  61         /* Just to prevent from allocating much pages. */
  62         hw->period_bytes_max = hw->period_bytes_min * 2048;
  63         hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
  64 }
  65
  66 static int init_hw_info(struct snd_dice *dice,
  67                         struct snd_pcm_substream *substream)
  68 {
  69         struct snd_pcm_runtime *runtime = substream->runtime;
  70         struct snd_pcm_hardware *hw = &runtime->hw;
  71         enum amdtp_stream_direction dir;
  72         struct amdtp_stream *stream;
  73         __be32 reg[2];
  74         unsigned int count, size;
  75         int err;
  76
  77         hw->info = SNDRV_PCM_INFO_MMAP |
  78                    SNDRV_PCM_INFO_MMAP_VALID |
  79                    SNDRV_PCM_INFO_BATCH |
  80                    SNDRV_PCM_INFO_INTERLEAVED |
  81                    SNDRV_PCM_INFO_JOINT_DUPLEX |
  82                    SNDRV_PCM_INFO_BLOCK_TRANSFER;
  83
  84         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
  85                 hw->formats = AM824_IN_PCM_FORMAT_BITS;
  86                 dir = AMDTP_IN_STREAM;
  87                 stream = &dice->tx_stream[substream->pcm->device];
  88                 err = snd_dice_transaction_read_tx(dice, TX_NUMBER, reg,
  89                                                    sizeof(reg));
  90         } else {
  91                 hw->formats = AM824_OUT_PCM_FORMAT_BITS;
  92                 dir = AMDTP_OUT_STREAM;
  93                 stream = &dice->rx_stream[substream->pcm->device];
  94                 err = snd_dice_transaction_read_rx(dice, RX_NUMBER, reg,
  95                                                    sizeof(reg));
  96         }
  97
  98         if (err < 0)
  99                 return err;
 100
 101         count = min_t(unsigned int, be32_to_cpu(reg[0]), MAX_STREAMS);
 102         if (substream->pcm->device >= count)
 103                 return -ENXIO;
 104
 105         size = be32_to_cpu(reg[1]) * 4;
 106         err = limit_channels_and_rates(dice, substream->runtime, dir,
 107                                        substream->pcm->device, size);
 108         if (err < 0)
 109                 return err;
 110         limit_period_and_buffer(hw);
 111
 112         return amdtp_am824_add_pcm_hw_constraints(stream, runtime);
 113 }
 114
 115 static int pcm_open(struct snd_pcm_substream *substream)
 116 {
 117         struct snd_dice *dice = substream->private_data;
 118         int err;
 119
 120         err = snd_dice_stream_lock_try(dice);
 121         if (err < 0)
 122                 goto end;
 123
 124         err = init_hw_info(dice, substream);
 125         if (err < 0)
 126                 goto err_locked;
 127
 128         snd_pcm_set_sync(substream);
 129 end:
 130         return err;
 131 err_locked:
 132         snd_dice_stream_lock_release(dice);
 133         return err;
 134 }
 135
 136 static int pcm_close(struct snd_pcm_substream *substream)
 137 {
 138         struct snd_dice *dice = substream->private_data;
 139
 140         snd_dice_stream_lock_release(dice);
 141
 142         return 0;
 143 }
 144
 145 static int capture_hw_params(struct snd_pcm_substream *substream,
 146                              struct snd_pcm_hw_params *hw_params)
 147 {
 148         struct snd_dice *dice = substream->private_data;
 149         struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 150         int err;
 151
 152         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 153                                                params_buffer_bytes(hw_params));
 154         if (err < 0)
 155                 return err;
 156
 157         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 158                 mutex_lock(&dice->mutex);
 159                 dice->substreams_counter++;
 160                 mutex_unlock(&dice->mutex);
 161         }
 162
 163         amdtp_am824_set_pcm_format(stream, params_format(hw_params));
 164
 165         return 0;
 166 }
 167 static int playback_hw_params(struct snd_pcm_substream *substream,
 168                               struct snd_pcm_hw_params *hw_params)
 169 {
 170         struct snd_dice *dice = substream->private_data;
 171         struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 172         int err;
 173
 174         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 175                                                params_buffer_bytes(hw_params));
 176         if (err < 0)
 177                 return err;
 178
 179         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 180                 mutex_lock(&dice->mutex);
 181                 dice->substreams_counter++;
 182                 mutex_unlock(&dice->mutex);
 183         }
 184
 185         amdtp_am824_set_pcm_format(stream, params_format(hw_params));
 186
 187         return 0;
 188 }
 189
 190 static int capture_hw_free(struct snd_pcm_substream *substream)
 191 {
 192         struct snd_dice *dice = substream->private_data;
 193
 194         mutex_lock(&dice->mutex);
 195
 196         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 197                 dice->substreams_counter--;
 198
 199         snd_dice_stream_stop_duplex(dice);
 200
 201         mutex_unlock(&dice->mutex);
 202
 203         return snd_pcm_lib_free_vmalloc_buffer(substream);
 204 }
 205
 206 static int playback_hw_free(struct snd_pcm_substream *substream)
 207 {
 208         struct snd_dice *dice = substream->private_data;
 209
 210         mutex_lock(&dice->mutex);
 211
 212         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 213                 dice->substreams_counter--;
 214
 215         snd_dice_stream_stop_duplex(dice);
 216
 217         mutex_unlock(&dice->mutex);
 218
 219         return snd_pcm_lib_free_vmalloc_buffer(substream);
 220 }
 221
 222 static int capture_prepare(struct snd_pcm_substream *substream)
 223 {
 224         struct snd_dice *dice = substream->private_data;
 225         struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 226         int err;
 227
 228         mutex_lock(&dice->mutex);
 229         err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
 230         mutex_unlock(&dice->mutex);
 231         if (err >= 0)
 232                 amdtp_stream_pcm_prepare(stream);
 233
 234         return 0;
 235 }
 236 static int playback_prepare(struct snd_pcm_substream *substream)
 237 {
 238         struct snd_dice *dice = substream->private_data;
 239         struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 240         int err;
 241
 242         mutex_lock(&dice->mutex);
 243         err = snd_dice_stream_start_duplex(dice, substream->runtime->rate);
 244         mutex_unlock(&dice->mutex);
 245         if (err >= 0)
 246                 amdtp_stream_pcm_prepare(stream);
 247
 248         return err;
 249 }
 250
 251 static int capture_trigger(struct snd_pcm_substream *substream, int cmd)
 252 {
 253         struct snd_dice *dice = substream->private_data;
 254         struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 255
 256         switch (cmd) {
 257         case SNDRV_PCM_TRIGGER_START:
 258                 amdtp_stream_pcm_trigger(stream, substream);
 259                 break;
 260         case SNDRV_PCM_TRIGGER_STOP:
 261                 amdtp_stream_pcm_trigger(stream, NULL);
 262                 break;
 263         default:
 264                 return -EINVAL;
 265         }
 266
 267         return 0;
 268 }
 269 static int playback_trigger(struct snd_pcm_substream *substream, int cmd)
 270 {
 271         struct snd_dice *dice = substream->private_data;
 272         struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 273
 274         switch (cmd) {
 275         case SNDRV_PCM_TRIGGER_START:
 276                 amdtp_stream_pcm_trigger(stream, substream);
 277                 break;
 278         case SNDRV_PCM_TRIGGER_STOP:
 279                 amdtp_stream_pcm_trigger(stream, NULL);
 280                 break;
 281         default:
 282                 return -EINVAL;
 283         }
 284
 285         return 0;
 286 }
 287
 288 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream)
 289 {
 290         struct snd_dice *dice = substream->private_data;
 291         struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device];
 292
 293         return amdtp_stream_pcm_pointer(stream);
 294 }
 295 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream)
 296 {
 297         struct snd_dice *dice = substream->private_data;
 298         struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device];
 299
 300         return amdtp_stream_pcm_pointer(stream);
 301 }
 302
 303 int snd_dice_create_pcm(struct snd_dice *dice)
 304 {
 305         static const struct snd_pcm_ops capture_ops = {
 306                 .open      = pcm_open,
 307                 .close     = pcm_close,
 308                 .ioctl     = snd_pcm_lib_ioctl,
 309                 .hw_params = capture_hw_params,
 310                 .hw_free   = capture_hw_free,
 311                 .prepare   = capture_prepare,
 312                 .trigger   = capture_trigger,
 313                 .pointer   = capture_pointer,
 314                 .page      = snd_pcm_lib_get_vmalloc_page,
 315                 .mmap      = snd_pcm_lib_mmap_vmalloc,
 316         };
 317         static const struct snd_pcm_ops playback_ops = {
 318                 .open      = pcm_open,
 319                 .close     = pcm_close,
 320                 .ioctl     = snd_pcm_lib_ioctl,
 321                 .hw_params = playback_hw_params,
 322                 .hw_free   = playback_hw_free,
 323                 .prepare   = playback_prepare,
 324                 .trigger   = playback_trigger,
 325                 .pointer   = playback_pointer,
 326                 .page      = snd_pcm_lib_get_vmalloc_page,
 327                 .mmap      = snd_pcm_lib_mmap_vmalloc,
 328         };
 329         __be32 reg;
 330         struct snd_pcm *pcm;
 331         unsigned int i, max_capture, max_playback, capture, playback;
 332         int err;
 333
 334         /* Check whether PCM substreams are required. */
 335         if (dice->force_two_pcms) {
 336                 max_capture = max_playback = 2;
 337         } else {
 338                 max_capture = max_playback = 0;
 339                 err = snd_dice_transaction_read_tx(dice, TX_NUMBER, &reg,
 340                                                    sizeof(reg));
 341                 if (err < 0)
 342                         return err;
 343                 max_capture = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
 344
 345                 err = snd_dice_transaction_read_rx(dice, RX_NUMBER, &reg,
 346                                                    sizeof(reg));
 347                 if (err < 0)
 348                         return err;
 349                 max_playback = min_t(unsigned int, be32_to_cpu(reg), MAX_STREAMS);
 350         }
 351
 352         for (i = 0; i < MAX_STREAMS; i++) {
 353                 capture = playback = 0;
 354                 if (i < max_capture)
 355                         capture = 1;
 356                 if (i < max_playback)
 357                         playback = 1;
 358                 if (capture == 0 && playback == 0)
 359                         break;
 360
 361                 err = snd_pcm_new(dice->card, "DICE", i, playback, capture,
 362                                   &pcm);
 363                 if (err < 0)
 364                         return err;
 365                 pcm->private_data = dice;
 366                 strcpy(pcm->name, dice->card->shortname);
 367
 368                 if (capture > 0)
 369                         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 370                                         &capture_ops);
 371
 372                 if (playback > 0)
 373                         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 374                                         &playback_ops);
 375         }
 376
 377         return 0;
 378 }