1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * dice_pcm.c - a part of driver for DICE based devices 4 * 5 * Copyright (c) Clemens Ladisch <clemens@ladisch.de> 6 * Copyright (c) 2014 Takashi Sakamoto <o-takashi@sakamocchi.jp> 7 */ 8 9 #include "dice.h" 10 11 static int dice_rate_constraint(struct snd_pcm_hw_params *params, 12 struct snd_pcm_hw_rule *rule) 13 { 14 struct snd_pcm_substream *substream = rule->private; 15 struct snd_dice *dice = substream->private_data; 16 unsigned int index = substream->pcm->device; 17 18 const struct snd_interval *c = 19 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 20 struct snd_interval *r = 21 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 22 struct snd_interval rates = { 23 .min = UINT_MAX, .max = 0, .integer = 1 24 }; 25 unsigned int *pcm_channels; 26 enum snd_dice_rate_mode mode; 27 unsigned int i, rate; 28 29 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 30 pcm_channels = dice->tx_pcm_chs[index]; 31 else 32 pcm_channels = dice->rx_pcm_chs[index]; 33 34 for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { 35 rate = snd_dice_rates[i]; 36 if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) 37 continue; 38 39 if (!snd_interval_test(c, pcm_channels[mode])) 40 continue; 41 42 rates.min = min(rates.min, rate); 43 rates.max = max(rates.max, rate); 44 } 45 46 return snd_interval_refine(r, &rates); 47 } 48 49 static int dice_channels_constraint(struct snd_pcm_hw_params *params, 50 struct snd_pcm_hw_rule *rule) 51 { 52 struct snd_pcm_substream *substream = rule->private; 53 struct snd_dice *dice = substream->private_data; 54 unsigned int index = substream->pcm->device; 55 56 const struct snd_interval *r = 57 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 58 struct snd_interval *c = 59 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 60 struct snd_interval channels = { 61 .min = UINT_MAX, .max = 0, .integer = 1 62 }; 63 unsigned int *pcm_channels; 64 enum snd_dice_rate_mode mode; 65 unsigned int i, rate; 66 67 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 68 pcm_channels = dice->tx_pcm_chs[index]; 69 else 70 pcm_channels = dice->rx_pcm_chs[index]; 71 72 for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { 73 rate = snd_dice_rates[i]; 74 if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) 75 continue; 76 77 if (!snd_interval_test(r, rate)) 78 continue; 79 80 channels.min = min(channels.min, pcm_channels[mode]); 81 channels.max = max(channels.max, pcm_channels[mode]); 82 } 83 84 return snd_interval_refine(c, &channels); 85 } 86 87 static int limit_channels_and_rates(struct snd_dice *dice, 88 struct snd_pcm_runtime *runtime, 89 enum amdtp_stream_direction dir, 90 unsigned int index) 91 { 92 struct snd_pcm_hardware *hw = &runtime->hw; 93 unsigned int *pcm_channels; 94 unsigned int i; 95 96 if (dir == AMDTP_IN_STREAM) 97 pcm_channels = dice->tx_pcm_chs[index]; 98 else 99 pcm_channels = dice->rx_pcm_chs[index]; 100 101 hw->channels_min = UINT_MAX; 102 hw->channels_max = 0; 103 104 for (i = 0; i < ARRAY_SIZE(snd_dice_rates); ++i) { 105 enum snd_dice_rate_mode mode; 106 unsigned int rate, channels; 107 108 rate = snd_dice_rates[i]; 109 if (snd_dice_stream_get_rate_mode(dice, rate, &mode) < 0) 110 continue; 111 hw->rates |= snd_pcm_rate_to_rate_bit(rate); 112 113 channels = pcm_channels[mode]; 114 if (channels == 0) 115 continue; 116 hw->channels_min = min(hw->channels_min, channels); 117 hw->channels_max = max(hw->channels_max, channels); 118 } 119 120 snd_pcm_limit_hw_rates(runtime); 121 122 return 0; 123 } 124 125 static int init_hw_info(struct snd_dice *dice, 126 struct snd_pcm_substream *substream) 127 { 128 struct snd_pcm_runtime *runtime = substream->runtime; 129 struct snd_pcm_hardware *hw = &runtime->hw; 130 unsigned int index = substream->pcm->device; 131 enum amdtp_stream_direction dir; 132 struct amdtp_stream *stream; 133 int err; 134 135 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 136 hw->formats = AM824_IN_PCM_FORMAT_BITS; 137 dir = AMDTP_IN_STREAM; 138 stream = &dice->tx_stream[index]; 139 } else { 140 hw->formats = AM824_OUT_PCM_FORMAT_BITS; 141 dir = AMDTP_OUT_STREAM; 142 stream = &dice->rx_stream[index]; 143 } 144 145 err = limit_channels_and_rates(dice, substream->runtime, dir, 146 index); 147 if (err < 0) 148 return err; 149 150 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 151 dice_rate_constraint, substream, 152 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 153 if (err < 0) 154 return err; 155 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 156 dice_channels_constraint, substream, 157 SNDRV_PCM_HW_PARAM_RATE, -1); 158 if (err < 0) 159 return err; 160 161 return amdtp_am824_add_pcm_hw_constraints(stream, runtime); 162 } 163 164 static int pcm_open(struct snd_pcm_substream *substream) 165 { 166 struct snd_dice *dice = substream->private_data; 167 struct amdtp_domain *d = &dice->domain; 168 unsigned int source; 169 bool internal; 170 int err; 171 172 err = snd_dice_stream_lock_try(dice); 173 if (err < 0) 174 return err; 175 176 err = init_hw_info(dice, substream); 177 if (err < 0) 178 goto err_locked; 179 180 err = snd_dice_transaction_get_clock_source(dice, &source); 181 if (err < 0) 182 goto err_locked; 183 switch (source) { 184 case CLOCK_SOURCE_AES1: 185 case CLOCK_SOURCE_AES2: 186 case CLOCK_SOURCE_AES3: 187 case CLOCK_SOURCE_AES4: 188 case CLOCK_SOURCE_AES_ANY: 189 case CLOCK_SOURCE_ADAT: 190 case CLOCK_SOURCE_TDIF: 191 case CLOCK_SOURCE_WC: 192 internal = false; 193 break; 194 default: 195 internal = true; 196 break; 197 } 198 199 mutex_lock(&dice->mutex); 200 201 // When source of clock is not internal or any stream is reserved for 202 // transmission of PCM frames, the available sampling rate is limited 203 // at current one. 204 if (!internal || 205 (dice->substreams_counter > 0 && d->events_per_period > 0)) { 206 unsigned int frames_per_period = d->events_per_period; 207 unsigned int frames_per_buffer = d->events_per_buffer; 208 unsigned int rate; 209 210 err = snd_dice_transaction_get_rate(dice, &rate); 211 if (err < 0) { 212 mutex_unlock(&dice->mutex); 213 goto err_locked; 214 } 215 216 substream->runtime->hw.rate_min = rate; 217 substream->runtime->hw.rate_max = rate; 218 219 if (frames_per_period > 0) { 220 // For double_pcm_frame quirk. 221 if (rate > 96000) { 222 frames_per_period *= 2; 223 frames_per_buffer *= 2; 224 } 225 226 err = snd_pcm_hw_constraint_minmax(substream->runtime, 227 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 228 frames_per_period, frames_per_period); 229 if (err < 0) { 230 mutex_unlock(&dice->mutex); 231 goto err_locked; 232 } 233 234 err = snd_pcm_hw_constraint_minmax(substream->runtime, 235 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 236 frames_per_buffer, frames_per_buffer); 237 if (err < 0) { 238 mutex_unlock(&dice->mutex); 239 goto err_locked; 240 } 241 } 242 } 243 244 mutex_unlock(&dice->mutex); 245 246 snd_pcm_set_sync(substream); 247 248 return 0; 249 err_locked: 250 snd_dice_stream_lock_release(dice); 251 return err; 252 } 253 254 static int pcm_close(struct snd_pcm_substream *substream) 255 { 256 struct snd_dice *dice = substream->private_data; 257 258 snd_dice_stream_lock_release(dice); 259 260 return 0; 261 } 262 263 static int pcm_hw_params(struct snd_pcm_substream *substream, 264 struct snd_pcm_hw_params *hw_params) 265 { 266 struct snd_dice *dice = substream->private_data; 267 int err = 0; 268 269 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 270 unsigned int rate = params_rate(hw_params); 271 unsigned int events_per_period = params_period_size(hw_params); 272 unsigned int events_per_buffer = params_buffer_size(hw_params); 273 274 mutex_lock(&dice->mutex); 275 // For double_pcm_frame quirk. 276 if (rate > 96000) { 277 events_per_period /= 2; 278 events_per_buffer /= 2; 279 } 280 err = snd_dice_stream_reserve_duplex(dice, rate, 281 events_per_period, events_per_buffer); 282 if (err >= 0) 283 ++dice->substreams_counter; 284 mutex_unlock(&dice->mutex); 285 } 286 287 return err; 288 } 289 290 static int pcm_hw_free(struct snd_pcm_substream *substream) 291 { 292 struct snd_dice *dice = substream->private_data; 293 294 mutex_lock(&dice->mutex); 295 296 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 297 --dice->substreams_counter; 298 299 snd_dice_stream_stop_duplex(dice); 300 301 mutex_unlock(&dice->mutex); 302 303 return 0; 304 } 305 306 static int capture_prepare(struct snd_pcm_substream *substream) 307 { 308 struct snd_dice *dice = substream->private_data; 309 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device]; 310 int err; 311 312 mutex_lock(&dice->mutex); 313 err = snd_dice_stream_start_duplex(dice); 314 mutex_unlock(&dice->mutex); 315 if (err >= 0) 316 amdtp_stream_pcm_prepare(stream); 317 318 return 0; 319 } 320 static int playback_prepare(struct snd_pcm_substream *substream) 321 { 322 struct snd_dice *dice = substream->private_data; 323 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device]; 324 int err; 325 326 mutex_lock(&dice->mutex); 327 err = snd_dice_stream_start_duplex(dice); 328 mutex_unlock(&dice->mutex); 329 if (err >= 0) 330 amdtp_stream_pcm_prepare(stream); 331 332 return err; 333 } 334 335 static int capture_trigger(struct snd_pcm_substream *substream, int cmd) 336 { 337 struct snd_dice *dice = substream->private_data; 338 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device]; 339 340 switch (cmd) { 341 case SNDRV_PCM_TRIGGER_START: 342 amdtp_stream_pcm_trigger(stream, substream); 343 break; 344 case SNDRV_PCM_TRIGGER_STOP: 345 amdtp_stream_pcm_trigger(stream, NULL); 346 break; 347 default: 348 return -EINVAL; 349 } 350 351 return 0; 352 } 353 static int playback_trigger(struct snd_pcm_substream *substream, int cmd) 354 { 355 struct snd_dice *dice = substream->private_data; 356 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device]; 357 358 switch (cmd) { 359 case SNDRV_PCM_TRIGGER_START: 360 amdtp_stream_pcm_trigger(stream, substream); 361 break; 362 case SNDRV_PCM_TRIGGER_STOP: 363 amdtp_stream_pcm_trigger(stream, NULL); 364 break; 365 default: 366 return -EINVAL; 367 } 368 369 return 0; 370 } 371 372 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream) 373 { 374 struct snd_dice *dice = substream->private_data; 375 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device]; 376 377 return amdtp_domain_stream_pcm_pointer(&dice->domain, stream); 378 } 379 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream) 380 { 381 struct snd_dice *dice = substream->private_data; 382 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device]; 383 384 return amdtp_domain_stream_pcm_pointer(&dice->domain, stream); 385 } 386 387 static int capture_ack(struct snd_pcm_substream *substream) 388 { 389 struct snd_dice *dice = substream->private_data; 390 struct amdtp_stream *stream = &dice->tx_stream[substream->pcm->device]; 391 392 return amdtp_domain_stream_pcm_ack(&dice->domain, stream); 393 } 394 395 static int playback_ack(struct snd_pcm_substream *substream) 396 { 397 struct snd_dice *dice = substream->private_data; 398 struct amdtp_stream *stream = &dice->rx_stream[substream->pcm->device]; 399 400 return amdtp_domain_stream_pcm_ack(&dice->domain, stream); 401 } 402 403 int snd_dice_create_pcm(struct snd_dice *dice) 404 { 405 static const struct snd_pcm_ops capture_ops = { 406 .open = pcm_open, 407 .close = pcm_close, 408 .hw_params = pcm_hw_params, 409 .hw_free = pcm_hw_free, 410 .prepare = capture_prepare, 411 .trigger = capture_trigger, 412 .pointer = capture_pointer, 413 .ack = capture_ack, 414 }; 415 static const struct snd_pcm_ops playback_ops = { 416 .open = pcm_open, 417 .close = pcm_close, 418 .hw_params = pcm_hw_params, 419 .hw_free = pcm_hw_free, 420 .prepare = playback_prepare, 421 .trigger = playback_trigger, 422 .pointer = playback_pointer, 423 .ack = playback_ack, 424 }; 425 struct snd_pcm *pcm; 426 unsigned int capture, playback; 427 int i, j; 428 int err; 429 430 for (i = 0; i < MAX_STREAMS; i++) { 431 capture = playback = 0; 432 for (j = 0; j < SND_DICE_RATE_MODE_COUNT; ++j) { 433 if (dice->tx_pcm_chs[i][j] > 0) 434 capture = 1; 435 if (dice->rx_pcm_chs[i][j] > 0) 436 playback = 1; 437 } 438 439 err = snd_pcm_new(dice->card, "DICE", i, playback, capture, 440 &pcm); 441 if (err < 0) 442 return err; 443 pcm->private_data = dice; 444 strcpy(pcm->name, dice->card->shortname); 445 446 if (capture > 0) 447 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, 448 &capture_ops); 449 450 if (playback > 0) 451 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 452 &playback_ops); 453 454 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, 455 NULL, 0, 0); 456 } 457 458 return 0; 459 } 460