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;
 121
 122         err = snd_pcm_lib_alloc_vmalloc_buffer(substream,
 123                                                params_buffer_bytes(hw_params));
 124         if (err < 0)
 125                 return err;
 126
 127         if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 128                 unsigned int rate = params_rate(hw_params);
 129                 unsigned int frames_per_period = params_period_size(hw_params);
 130                 unsigned int frames_per_buffer = params_buffer_size(hw_params);
 131
 132                 mutex_lock(&tscm->mutex);
 133                 err = snd_tscm_stream_reserve_duplex(tscm, rate,
 134                                         frames_per_period, frames_per_buffer);
 135                 if (err >= 0)
 136                         ++tscm->substreams_counter;
 137                 mutex_unlock(&tscm->mutex);
 138         }
 139
 140         return err;
 141 }
 142
 143 static int pcm_hw_free(struct snd_pcm_substream *substream)
 144 {
 145         struct snd_tscm *tscm = substream->private_data;
 146
 147         mutex_lock(&tscm->mutex);
 148
 149         if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 150                 --tscm->substreams_counter;
 151
 152         snd_tscm_stream_stop_duplex(tscm);
 153
 154         mutex_unlock(&tscm->mutex);
 155
 156         return snd_pcm_lib_free_vmalloc_buffer(substream);
 157 }
 158
 159 static int pcm_capture_prepare(struct snd_pcm_substream *substream)
 160 {
 161         struct snd_tscm *tscm = substream->private_data;
 162         struct snd_pcm_runtime *runtime = substream->runtime;
 163         int err;
 164
 165         mutex_lock(&tscm->mutex);
 166
 167         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 168         if (err >= 0)
 169                 amdtp_stream_pcm_prepare(&tscm->tx_stream);
 170
 171         mutex_unlock(&tscm->mutex);
 172
 173         return err;
 174 }
 175
 176 static int pcm_playback_prepare(struct snd_pcm_substream *substream)
 177 {
 178         struct snd_tscm *tscm = substream->private_data;
 179         struct snd_pcm_runtime *runtime = substream->runtime;
 180         int err;
 181
 182         mutex_lock(&tscm->mutex);
 183
 184         err = snd_tscm_stream_start_duplex(tscm, runtime->rate);
 185         if (err >= 0)
 186                 amdtp_stream_pcm_prepare(&tscm->rx_stream);
 187
 188         mutex_unlock(&tscm->mutex);
 189
 190         return err;
 191 }
 192
 193 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 194 {
 195         struct snd_tscm *tscm = substream->private_data;
 196
 197         switch (cmd) {
 198         case SNDRV_PCM_TRIGGER_START:
 199                 amdtp_stream_pcm_trigger(&tscm->tx_stream, substream);
 200                 break;
 201         case SNDRV_PCM_TRIGGER_STOP:
 202                 amdtp_stream_pcm_trigger(&tscm->tx_stream, NULL);
 203                 break;
 204         default:
 205                 return -EINVAL;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 212 {
 213         struct snd_tscm *tscm = substream->private_data;
 214
 215         switch (cmd) {
 216         case SNDRV_PCM_TRIGGER_START:
 217                 amdtp_stream_pcm_trigger(&tscm->rx_stream, substream);
 218                 break;
 219         case SNDRV_PCM_TRIGGER_STOP:
 220                 amdtp_stream_pcm_trigger(&tscm->rx_stream, NULL);
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm)
 230 {
 231         struct snd_tscm *tscm = sbstrm->private_data;
 232
 233         return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->tx_stream);
 234 }
 235
 236 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm)
 237 {
 238         struct snd_tscm *tscm = sbstrm->private_data;
 239
 240         return amdtp_domain_stream_pcm_pointer(&tscm->domain, &tscm->rx_stream);
 241 }
 242
 243 static int pcm_capture_ack(struct snd_pcm_substream *substream)
 244 {
 245         struct snd_tscm *tscm = substream->private_data;
 246
 247         return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->tx_stream);
 248 }
 249
 250 static int pcm_playback_ack(struct snd_pcm_substream *substream)
 251 {
 252         struct snd_tscm *tscm = substream->private_data;
 253
 254         return amdtp_domain_stream_pcm_ack(&tscm->domain, &tscm->rx_stream);
 255 }
 256
 257 int snd_tscm_create_pcm_devices(struct snd_tscm *tscm)
 258 {
 259         static const struct snd_pcm_ops capture_ops = {
 260                 .open           = pcm_open,
 261                 .close          = pcm_close,
 262                 .ioctl          = snd_pcm_lib_ioctl,
 263                 .hw_params      = pcm_hw_params,
 264                 .hw_free        = pcm_hw_free,
 265                 .prepare        = pcm_capture_prepare,
 266                 .trigger        = pcm_capture_trigger,
 267                 .pointer        = pcm_capture_pointer,
 268                 .ack            = pcm_capture_ack,
 269                 .page           = snd_pcm_lib_get_vmalloc_page,
 270         };
 271         static const struct snd_pcm_ops playback_ops = {
 272                 .open           = pcm_open,
 273                 .close          = pcm_close,
 274                 .ioctl          = snd_pcm_lib_ioctl,
 275                 .hw_params      = pcm_hw_params,
 276                 .hw_free        = pcm_hw_free,
 277                 .prepare        = pcm_playback_prepare,
 278                 .trigger        = pcm_playback_trigger,
 279                 .pointer        = pcm_playback_pointer,
 280                 .ack            = pcm_playback_ack,
 281                 .page           = snd_pcm_lib_get_vmalloc_page,
 282         };
 283         struct snd_pcm *pcm;
 284         int err;
 285
 286         err = snd_pcm_new(tscm->card, tscm->card->driver, 0, 1, 1, &pcm);
 287         if (err < 0)
 288                 return err;
 289
 290         pcm->private_data = tscm;
 291         snprintf(pcm->name, sizeof(pcm->name),
 292                  "%s PCM", tscm->card->shortname);
 293         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops);
 294         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops);
 295
 296         return 0;
 297 }