sound/firewire/tascam/tascam-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * tascam-pcm.c - a part of driver for TASCAM FireWire series
   4  *
   5  * Copyright (c) 2015 Takashi Sakamoto
   6  */
   7
   8 #include "tascam.h"
   9
  10 static int pcm_init_hw_params(struct snd_tscm *tscm,
  11                               struct snd_pcm_substream *substream)
  12 {
  13         struct snd_pcm_runtime *runtime = substream->runtime;
  14         struct snd_pcm_hardware *hw = &runtime->hw;
  15         struct amdtp_stream *stream;
  16         unsigned int pcm_channels;
  17
  18         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
  19                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
  20                 stream = &tscm->tx_stream;
  21                 pcm_channels = tscm->spec->pcm_capture_analog_channels;
  22         } else {
  23                 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32;
  24                 stream = &tscm->rx_stream;
  25                 pcm_channels = tscm->spec->pcm_playback_analog_channels;
  26         }
  27
  28         if (tscm->spec->has_adat)
  29                 pcm_channels += 8;
  30         if (tscm->spec->has_spdif)
  31                 pcm_channels += 2;
  32         runtime->hw.channels_min = runtime->hw.channels_max = pcm_channels;
  33
  34         hw->rates = SNDRV_PCM_RATE_44100 |
  35                     SNDRV_PCM_RATE_48000 |
  36                     SNDRV_PCM_RATE_88200 |
  37                     SNDRV_PCM_RATE_96000;
  38         snd_pcm_limit_hw_rates(runtime);
  39
  40         return amdtp_tscm_add_pcm_hw_constraints(stream, runtime);
  41 }
  42
  43 static int pcm_open(struct snd_pcm_substream *substream)
  44 {
  45         struct snd_tscm *tscm = substream->private_data;
  46         struct amdtp_domain *d = &tscm->domain;
  47         enum snd_tscm_clock clock;
  48         int err;
  49
  50         err = snd_tscm_stream_lock_try(tscm);
  51         if (err < 0)
  52                 return err;
  53
  54         err = pcm_init_hw_params(tscm, substream);
  55         if (err < 0)
  56                 goto err_locked;
  57
  58         err = snd_tscm_stream_get_clock(tscm, &clock);
  59         if (err < 0)
  60                 goto err_locked;
  61
  62         mutex_lock(&tscm->mutex);
  63
  64         // When source of clock is not internal or any stream is reserved for
  65         // transmission of PCM frames, the available sampling rate is limited
  66         // at current one.
  67         if (clock != SND_TSCM_CLOCK_INTERNAL || tscm->substreams_counter > 0) {
  68                 unsigned int frames_per_period = d->events_per_period;
  69                 unsigned int frames_per_buffer = d->events_per_buffer;
  70                 unsigned int rate;
  71
  72                 err = snd_tscm_stream_get_rate(tscm, &rate);
  73                 if (err < 0) {
  74                         mutex_unlock(&tscm->mutex);
  75                         goto err_locked;
  76                 }
  77                 substream->runtime->hw.rate_min = rate;
  78                 substream->runtime->hw.rate_max = rate;
  79
  80                 err = snd_pcm_hw_constraint_minmax(substream->runtime,
  81                                         SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
  82                                         frames_per_period, frames_per_period);
  83                 if (err < 0) {
  84                         mutex_unlock(&tscm->mutex);
  85                         goto err_locked;
  86                 }
  87
  88                 err = snd_pcm_hw_constraint_minmax(substream->runtime,
  89                                         SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
  90                                         frames_per_buffer, frames_per_buffer);
  91                 if (err < 0) {
  92                         mutex_unlock(&tscm->mutex);
  93                         goto err_locked;
  94                 }
  95         }
  96
  97         mutex_unlock(&tscm->mutex);
  98
  99         snd_pcm_set_sync(substream);
 100
 101         return 0;
 102 err_locked:
 103         snd_tscm_stream_lock_release(tscm);
 104         return err;
 105 }
 106
 107 static int pcm_close(struct snd_pcm_substream *substream)
 108 {
 109         struct snd_tscm *tscm = substream->private_data;
 110
 111         snd_tscm_stream_lock_release(tscm);
 112
 113         return 0;
 114 }
 115
 116 static int pcm_hw_params(struct snd_pcm_substream *substream,
 117                          struct snd_pcm_hw_params *hw_params)
 118 {
 119         struct snd_tscm *tscm = substream->private_data;
 120         int err = 0;
 121
 122         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 123                 unsigned int rate = params_rate(hw_params);
 124                 unsigned int frames_per_period = params_period_size(hw_params);
 125                 unsigned int frames_per_buffer = params_buffer_size(hw_params);
 126
 127                 mutex_lock(&tscm->mutex);
 128                 err = snd_tscm_stream_reserve_duplex(tscm, rate,
 129                                         frames_per_period, frames_per_buffer);
 130                 if (err >= 0)
 131                         ++tscm->substreams_counter;
 132                 mutex_unlock(&tscm->mutex);
 133         }
 134
 135         return err;
 136 }
 137
 138 static int pcm_hw_free(struct snd_pcm_substream *substream)
 139 {
 140         struct snd_tscm *tscm = substream->private_data;
 141
 142         mutex_lock(&tscm->mutex);
 143
 144         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 145                 --tscm->substreams_counter;
 146
 147         snd_tscm_stream_stop_duplex(tscm);
 148
 149         mutex_unlock(&tscm->mutex);
 150
 151         return 0;
 152 }
 153
 154 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
 155 {
 156         struct snd_tscm *tscm = substream->private_data;
 157         struct snd_pcm_runtime *runtime = substream->runtime;
 158         int err;
 159
 160         mutex_lock(&tscm->mutex);
 161
 162         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 163         if (err >= 0)
 164                 amdtp_stream_pcm_prepare(&tscm->tx_stream);
 165
 166         mutex_unlock(&tscm->mutex);
 167
 168         return err;
 169 }
 170
 171 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 172 {
 173         struct snd_tscm *tscm = substream->private_data;
 174         struct snd_pcm_runtime *runtime = substream->runtime;
 175         int err;
 176
 177         mutex_lock(&tscm->mutex);
 178
 179         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 180         if (err >= 0)
 181                 amdtp_stream_pcm_prepare(&tscm->rx_stream);
 182
 183         mutex_unlock(&tscm->mutex);
 184
 185         return err;
 186 }
 187
 188 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 189 {
 190         struct snd_tscm *tscm = substream->private_data;
 191
 192         switch (cmd) {
 193         case SNDRV_PCM_TRIGGER_START:
 194                 amdtp_stream_pcm_trigger(&tscm->tx_stream, substream);
 195                 break;
 196         case SNDRV_PCM_TRIGGER_STOP:
 197                 amdtp_stream_pcm_trigger(&tscm->tx_stream, NULL);
 198                 break;
 199         default:
 200                 return -EINVAL;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 207 {
 208         struct snd_tscm *tscm = substream->private_data;
 209
 210         switch (cmd) {
 211         case SNDRV_PCM_TRIGGER_START:
 212                 amdtp_stream_pcm_trigger(&tscm->rx_stream, substream);
 213                 break;
 214         case SNDRV_PCM_TRIGGER_STOP:
 215                 amdtp_stream_pcm_trigger(&tscm->rx_stream, NULL);
 216                 break;
 217         default:
 218                 return -EINVAL;
 219         }
 220
 221         return 0;
 222 }
 223
 224 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 225 {
 226         struct snd_tscm *tscm = sbstrm->private_data;
 227
 228         return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->tx_stream);
 229 }
 230
 231 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 232 {
 233         struct snd_tscm *tscm = sbstrm->private_data;
 234
 235         return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->rx_stream);
 236 }
 237
 238 static int pcm_capture_ack(struct snd_pcm_substream *substream)
 239 {
 240         struct snd_tscm *tscm = substream->private_data;
 241
 242         return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->tx_stream);
 243 }
 244
 245 static int pcm_playback_ack(struct snd_pcm_substream *substream)
 246 {
 247         struct snd_tscm *tscm = substream->private_data;
 248
 249         return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->rx_stream);
 250 }
 251
 252 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
 253 {
 254         static const struct snd_pcm_ops capture_ops = {
 255                 .open           = pcm_open,
 256                 .close          = pcm_close,
 257                 .hw_params      = pcm_hw_params,
 258                 .hw_free        = pcm_hw_free,
 259                 .prepare        = pcm_capture_prepare,
 260                 .trigger        = pcm_capture_trigger,
 261                 .pointer        = pcm_capture_pointer,
 262                 .ack            = pcm_capture_ack,
 263         };
 264         static const struct snd_pcm_ops playback_ops = {
 265                 .open           = pcm_open,
 266                 .close          = pcm_close,
 267                 .hw_params      = pcm_hw_params,
 268                 .hw_free        = pcm_hw_free,
 269                 .prepare        = pcm_playback_prepare,
 270                 .trigger        = pcm_playback_trigger,
 271                 .pointer        = pcm_playback_pointer,
 272                 .ack            = pcm_playback_ack,
 273         };
 274         struct snd_pcm *pcm;
 275         int err;
 276
 277         err = snd_pcm_new(tscm->card, tscm->card->driver, 0, 1, 1, &pcm);
 278         if (err < 0)
 279                 return err;
 280
 281         pcm->private_data = tscm;
 282         snprintf(pcm->name, sizeof(pcm->name),
 283                  "%s PCM", tscm->card->shortname);
 284         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 285         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 286         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0);
 287
 288         return 0;
 289 }