1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * motu-pcm.c - a part of driver for MOTU FireWire series 4 * 5 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp> 6 */ 7 8 #include <sound/pcm_params.h> 9 #include "motu.h" 10 11 static int motu_rate_constraint(struct snd_pcm_hw_params *params, 12 struct snd_pcm_hw_rule *rule) 13 { 14 struct snd_motu_packet_format *formats = rule->private; 15 16 const struct snd_interval *c = 17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 18 struct snd_interval *r = 19 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 20 struct snd_interval rates = { 21 .min = UINT_MAX, .max = 0, .integer = 1 22 }; 23 unsigned int i, pcm_channels, rate, mode; 24 25 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 26 rate = snd_motu_clock_rates[i]; 27 mode = i / 2; 28 29 pcm_channels = formats->pcm_chunks[mode]; 30 if (!snd_interval_test(c, pcm_channels)) 31 continue; 32 33 rates.min = min(rates.min, rate); 34 rates.max = max(rates.max, rate); 35 } 36 37 return snd_interval_refine(r, &rates); 38 } 39 40 static int motu_channels_constraint(struct snd_pcm_hw_params *params, 41 struct snd_pcm_hw_rule *rule) 42 { 43 struct snd_motu_packet_format *formats = rule->private; 44 45 const struct snd_interval *r = 46 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 47 struct snd_interval *c = 48 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 49 struct snd_interval channels = { 50 .min = UINT_MAX, .max = 0, .integer = 1 51 }; 52 unsigned int i, pcm_channels, rate, mode; 53 54 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 55 rate = snd_motu_clock_rates[i]; 56 mode = i / 2; 57 58 if (!snd_interval_test(r, rate)) 59 continue; 60 61 pcm_channels = formats->pcm_chunks[mode]; 62 channels.min = min(channels.min, pcm_channels); 63 channels.max = max(channels.max, pcm_channels); 64 } 65 66 return snd_interval_refine(c, &channels); 67 } 68 69 static void limit_channels_and_rates(struct snd_motu *motu, 70 struct snd_pcm_runtime *runtime, 71 struct snd_motu_packet_format *formats) 72 { 73 struct snd_pcm_hardware *hw = &runtime->hw; 74 unsigned int i, pcm_channels, rate, mode; 75 76 hw->channels_min = UINT_MAX; 77 hw->channels_max = 0; 78 79 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 80 rate = snd_motu_clock_rates[i]; 81 mode = i / 2; 82 83 pcm_channels = formats->pcm_chunks[mode]; 84 if (pcm_channels == 0) 85 continue; 86 87 hw->rates |= snd_pcm_rate_to_rate_bit(rate); 88 hw->channels_min = min(hw->channels_min, pcm_channels); 89 hw->channels_max = max(hw->channels_max, pcm_channels); 90 } 91 92 snd_pcm_limit_hw_rates(runtime); 93 } 94 95 static int init_hw_info(struct snd_motu *motu, 96 struct snd_pcm_substream *substream) 97 { 98 struct snd_pcm_runtime *runtime = substream->runtime; 99 struct snd_pcm_hardware *hw = &runtime->hw; 100 struct amdtp_stream *stream; 101 struct snd_motu_packet_format *formats; 102 int err; 103 104 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 105 hw->formats = SNDRV_PCM_FMTBIT_S32; 106 stream = &motu->tx_stream; 107 formats = &motu->tx_packet_formats; 108 } else { 109 hw->formats = SNDRV_PCM_FMTBIT_S32; 110 stream = &motu->rx_stream; 111 formats = &motu->rx_packet_formats; 112 } 113 114 limit_channels_and_rates(motu, runtime, formats); 115 116 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 117 motu_rate_constraint, formats, 118 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 119 if (err < 0) 120 return err; 121 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 122 motu_channels_constraint, formats, 123 SNDRV_PCM_HW_PARAM_RATE, -1); 124 if (err < 0) 125 return err; 126 127 return amdtp_motu_add_pcm_hw_constraints(stream, runtime); 128 } 129 130 static int pcm_open(struct snd_pcm_substream *substream) 131 { 132 struct snd_motu *motu = substream->private_data; 133 struct amdtp_domain *d = &motu->domain; 134 enum snd_motu_clock_source src; 135 int err; 136 137 err = snd_motu_stream_lock_try(motu); 138 if (err < 0) 139 return err; 140 141 mutex_lock(&motu->mutex); 142 143 err = snd_motu_stream_cache_packet_formats(motu); 144 if (err < 0) 145 goto err_locked; 146 147 err = init_hw_info(motu, substream); 148 if (err < 0) 149 goto err_locked; 150 151 err = snd_motu_protocol_get_clock_source(motu, &src); 152 if (err < 0) 153 goto err_locked; 154 155 // When source of clock is not internal or any stream is reserved for 156 // transmission of PCM frames, the available sampling rate is limited 157 // at current one. 158 if ((src != SND_MOTU_CLOCK_SOURCE_INTERNAL && 159 src != SND_MOTU_CLOCK_SOURCE_SPH) || 160 (motu->substreams_counter > 0 && d->events_per_period > 0)) { 161 unsigned int frames_per_period = d->events_per_period; 162 unsigned int frames_per_buffer = d->events_per_buffer; 163 unsigned int rate; 164 165 err = snd_motu_protocol_get_clock_rate(motu, &rate); 166 if (err < 0) 167 goto err_locked; 168 169 substream->runtime->hw.rate_min = rate; 170 substream->runtime->hw.rate_max = rate; 171 172 if (frames_per_period > 0) { 173 err = snd_pcm_hw_constraint_minmax(substream->runtime, 174 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 175 frames_per_period, frames_per_period); 176 if (err < 0) 177 goto err_locked; 178 179 err = snd_pcm_hw_constraint_minmax(substream->runtime, 180 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 181 frames_per_buffer, frames_per_buffer); 182 if (err < 0) 183 goto err_locked; 184 } 185 } 186 187 snd_pcm_set_sync(substream); 188 189 mutex_unlock(&motu->mutex); 190 191 return 0; 192 err_locked: 193 mutex_unlock(&motu->mutex); 194 snd_motu_stream_lock_release(motu); 195 return err; 196 } 197 198 static int pcm_close(struct snd_pcm_substream *substream) 199 { 200 struct snd_motu *motu = substream->private_data; 201 202 snd_motu_stream_lock_release(motu); 203 204 return 0; 205 } 206 207 static int pcm_hw_params(struct snd_pcm_substream *substream, 208 struct snd_pcm_hw_params *hw_params) 209 { 210 struct snd_motu *motu = substream->private_data; 211 int err = 0; 212 213 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 214 unsigned int rate = params_rate(hw_params); 215 unsigned int frames_per_period = params_period_size(hw_params); 216 unsigned int frames_per_buffer = params_buffer_size(hw_params); 217 218 mutex_lock(&motu->mutex); 219 err = snd_motu_stream_reserve_duplex(motu, rate, 220 frames_per_period, frames_per_buffer); 221 if (err >= 0) 222 ++motu->substreams_counter; 223 mutex_unlock(&motu->mutex); 224 } 225 226 return err; 227 } 228 229 static int pcm_hw_free(struct snd_pcm_substream *substream) 230 { 231 struct snd_motu *motu = substream->private_data; 232 233 mutex_lock(&motu->mutex); 234 235 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 236 --motu->substreams_counter; 237 238 snd_motu_stream_stop_duplex(motu); 239 240 mutex_unlock(&motu->mutex); 241 242 return 0; 243 } 244 245 static int capture_prepare(struct snd_pcm_substream *substream) 246 { 247 struct snd_motu *motu = substream->private_data; 248 int err; 249 250 mutex_lock(&motu->mutex); 251 err = snd_motu_stream_start_duplex(motu); 252 mutex_unlock(&motu->mutex); 253 if (err >= 0) 254 amdtp_stream_pcm_prepare(&motu->tx_stream); 255 256 return 0; 257 } 258 static int playback_prepare(struct snd_pcm_substream *substream) 259 { 260 struct snd_motu *motu = substream->private_data; 261 int err; 262 263 mutex_lock(&motu->mutex); 264 err = snd_motu_stream_start_duplex(motu); 265 mutex_unlock(&motu->mutex); 266 if (err >= 0) 267 amdtp_stream_pcm_prepare(&motu->rx_stream); 268 269 return err; 270 } 271 272 static int capture_trigger(struct snd_pcm_substream *substream, int cmd) 273 { 274 struct snd_motu *motu = substream->private_data; 275 276 switch (cmd) { 277 case SNDRV_PCM_TRIGGER_START: 278 amdtp_stream_pcm_trigger(&motu->tx_stream, substream); 279 break; 280 case SNDRV_PCM_TRIGGER_STOP: 281 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL); 282 break; 283 default: 284 return -EINVAL; 285 } 286 287 return 0; 288 } 289 static int playback_trigger(struct snd_pcm_substream *substream, int cmd) 290 { 291 struct snd_motu *motu = substream->private_data; 292 293 switch (cmd) { 294 case SNDRV_PCM_TRIGGER_START: 295 amdtp_stream_pcm_trigger(&motu->rx_stream, substream); 296 break; 297 case SNDRV_PCM_TRIGGER_STOP: 298 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL); 299 break; 300 default: 301 return -EINVAL; 302 } 303 304 return 0; 305 } 306 307 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream) 308 { 309 struct snd_motu *motu = substream->private_data; 310 311 return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->tx_stream); 312 } 313 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream) 314 { 315 struct snd_motu *motu = substream->private_data; 316 317 return amdtp_domain_stream_pcm_pointer(&motu->domain, &motu->rx_stream); 318 } 319 320 static int capture_ack(struct snd_pcm_substream *substream) 321 { 322 struct snd_motu *motu = substream->private_data; 323 324 return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->tx_stream); 325 } 326 327 static int playback_ack(struct snd_pcm_substream *substream) 328 { 329 struct snd_motu *motu = substream->private_data; 330 331 return amdtp_domain_stream_pcm_ack(&motu->domain, &motu->rx_stream); 332 } 333 334 int snd_motu_create_pcm_devices(struct snd_motu *motu) 335 { 336 static const struct snd_pcm_ops capture_ops = { 337 .open = pcm_open, 338 .close = pcm_close, 339 .hw_params = pcm_hw_params, 340 .hw_free = pcm_hw_free, 341 .prepare = capture_prepare, 342 .trigger = capture_trigger, 343 .pointer = capture_pointer, 344 .ack = capture_ack, 345 }; 346 static const struct snd_pcm_ops playback_ops = { 347 .open = pcm_open, 348 .close = pcm_close, 349 .hw_params = pcm_hw_params, 350 .hw_free = pcm_hw_free, 351 .prepare = playback_prepare, 352 .trigger = playback_trigger, 353 .pointer = playback_pointer, 354 .ack = playback_ack, 355 }; 356 struct snd_pcm *pcm; 357 int err; 358 359 err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm); 360 if (err < 0) 361 return err; 362 pcm->private_data = motu; 363 strcpy(pcm->name, motu->card->shortname); 364 365 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 366 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 367 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); 368 369 return 0; 370 } 371