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