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->fixed_part_pcm_chunks[mode] + 30 formats->differed_part_pcm_chunks[mode]; 31 if (!snd_interval_test(c, pcm_channels)) 32 continue; 33 34 rates.min = min(rates.min, rate); 35 rates.max = max(rates.max, rate); 36 } 37 38 return snd_interval_refine(r, &rates); 39 } 40 41 static int motu_channels_constraint(struct snd_pcm_hw_params *params, 42 struct snd_pcm_hw_rule *rule) 43 { 44 struct snd_motu_packet_format *formats = rule->private; 45 46 const struct snd_interval *r = 47 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 48 struct snd_interval *c = 49 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 50 struct snd_interval channels = { 51 .min = UINT_MAX, .max = 0, .integer = 1 52 }; 53 unsigned int i, pcm_channels, rate, mode; 54 55 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 56 rate = snd_motu_clock_rates[i]; 57 mode = i / 2; 58 59 if (!snd_interval_test(r, rate)) 60 continue; 61 62 pcm_channels = formats->fixed_part_pcm_chunks[mode] + 63 formats->differed_part_pcm_chunks[mode]; 64 channels.min = min(channels.min, pcm_channels); 65 channels.max = max(channels.max, pcm_channels); 66 } 67 68 return snd_interval_refine(c, &channels); 69 } 70 71 static void limit_channels_and_rates(struct snd_motu *motu, 72 struct snd_pcm_runtime *runtime, 73 struct snd_motu_packet_format *formats) 74 { 75 struct snd_pcm_hardware *hw = &runtime->hw; 76 unsigned int i, pcm_channels, rate, mode; 77 78 hw->channels_min = UINT_MAX; 79 hw->channels_max = 0; 80 81 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 82 rate = snd_motu_clock_rates[i]; 83 mode = i / 2; 84 85 pcm_channels = formats->fixed_part_pcm_chunks[mode] + 86 formats->differed_part_pcm_chunks[mode]; 87 if (pcm_channels == 0) 88 continue; 89 90 hw->rates |= snd_pcm_rate_to_rate_bit(rate); 91 hw->channels_min = min(hw->channels_min, pcm_channels); 92 hw->channels_max = max(hw->channels_max, pcm_channels); 93 } 94 95 snd_pcm_limit_hw_rates(runtime); 96 } 97 98 static int init_hw_info(struct snd_motu *motu, 99 struct snd_pcm_substream *substream) 100 { 101 struct snd_pcm_runtime *runtime = substream->runtime; 102 struct snd_pcm_hardware *hw = &runtime->hw; 103 struct amdtp_stream *stream; 104 struct snd_motu_packet_format *formats; 105 int err; 106 107 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 108 hw->formats = SNDRV_PCM_FMTBIT_S32; 109 stream = &motu->tx_stream; 110 formats = &motu->tx_packet_formats; 111 } else { 112 hw->formats = SNDRV_PCM_FMTBIT_S32; 113 stream = &motu->rx_stream; 114 formats = &motu->rx_packet_formats; 115 } 116 117 limit_channels_and_rates(motu, runtime, formats); 118 119 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 120 motu_rate_constraint, formats, 121 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 122 if (err < 0) 123 return err; 124 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 125 motu_channels_constraint, formats, 126 SNDRV_PCM_HW_PARAM_RATE, -1); 127 if (err < 0) 128 return err; 129 130 return amdtp_motu_add_pcm_hw_constraints(stream, runtime); 131 } 132 133 static int pcm_open(struct snd_pcm_substream *substream) 134 { 135 struct snd_motu *motu = substream->private_data; 136 const struct snd_motu_protocol *const protocol = motu->spec->protocol; 137 enum snd_motu_clock_source src; 138 unsigned int rate; 139 int err; 140 141 err = snd_motu_stream_lock_try(motu); 142 if (err < 0) 143 return err; 144 145 mutex_lock(&motu->mutex); 146 147 err = snd_motu_stream_cache_packet_formats(motu); 148 if (err < 0) 149 goto err_locked; 150 151 err = init_hw_info(motu, substream); 152 if (err < 0) 153 goto err_locked; 154 155 /* 156 * When source of clock is not internal or any PCM streams are running, 157 * available sampling rate is limited at current sampling rate. 158 */ 159 err = protocol->get_clock_source(motu, &src); 160 if (err < 0) 161 goto err_locked; 162 if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL || 163 amdtp_stream_pcm_running(&motu->tx_stream) || 164 amdtp_stream_pcm_running(&motu->rx_stream)) { 165 err = protocol->get_clock_rate(motu, &rate); 166 if (err < 0) 167 goto err_locked; 168 substream->runtime->hw.rate_min = rate; 169 substream->runtime->hw.rate_max = rate; 170 } 171 172 snd_pcm_set_sync(substream); 173 174 mutex_unlock(&motu->mutex); 175 176 return err; 177 err_locked: 178 mutex_unlock(&motu->mutex); 179 snd_motu_stream_lock_release(motu); 180 return err; 181 } 182 183 static int pcm_close(struct snd_pcm_substream *substream) 184 { 185 struct snd_motu *motu = substream->private_data; 186 187 snd_motu_stream_lock_release(motu); 188 189 return 0; 190 } 191 192 static int capture_hw_params(struct snd_pcm_substream *substream, 193 struct snd_pcm_hw_params *hw_params) 194 { 195 struct snd_motu *motu = substream->private_data; 196 int err; 197 198 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 199 params_buffer_bytes(hw_params)); 200 if (err < 0) 201 return err; 202 203 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 204 mutex_lock(&motu->mutex); 205 motu->capture_substreams++; 206 mutex_unlock(&motu->mutex); 207 } 208 209 return 0; 210 } 211 static int playback_hw_params(struct snd_pcm_substream *substream, 212 struct snd_pcm_hw_params *hw_params) 213 { 214 struct snd_motu *motu = substream->private_data; 215 int err; 216 217 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 218 params_buffer_bytes(hw_params)); 219 if (err < 0) 220 return err; 221 222 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 223 mutex_lock(&motu->mutex); 224 motu->playback_substreams++; 225 mutex_unlock(&motu->mutex); 226 } 227 228 return 0; 229 } 230 231 static int capture_hw_free(struct snd_pcm_substream *substream) 232 { 233 struct snd_motu *motu = substream->private_data; 234 235 mutex_lock(&motu->mutex); 236 237 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 238 motu->capture_substreams--; 239 240 snd_motu_stream_stop_duplex(motu); 241 242 mutex_unlock(&motu->mutex); 243 244 return snd_pcm_lib_free_vmalloc_buffer(substream); 245 } 246 247 static int playback_hw_free(struct snd_pcm_substream *substream) 248 { 249 struct snd_motu *motu = substream->private_data; 250 251 mutex_lock(&motu->mutex); 252 253 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 254 motu->playback_substreams--; 255 256 snd_motu_stream_stop_duplex(motu); 257 258 mutex_unlock(&motu->mutex); 259 260 return snd_pcm_lib_free_vmalloc_buffer(substream); 261 } 262 263 static int capture_prepare(struct snd_pcm_substream *substream) 264 { 265 struct snd_motu *motu = substream->private_data; 266 int err; 267 268 mutex_lock(&motu->mutex); 269 err = snd_motu_stream_start_duplex(motu, substream->runtime->rate); 270 mutex_unlock(&motu->mutex); 271 if (err >= 0) 272 amdtp_stream_pcm_prepare(&motu->tx_stream); 273 274 return 0; 275 } 276 static int playback_prepare(struct snd_pcm_substream *substream) 277 { 278 struct snd_motu *motu = substream->private_data; 279 int err; 280 281 mutex_lock(&motu->mutex); 282 err = snd_motu_stream_start_duplex(motu, substream->runtime->rate); 283 mutex_unlock(&motu->mutex); 284 if (err >= 0) 285 amdtp_stream_pcm_prepare(&motu->rx_stream); 286 287 return err; 288 } 289 290 static int capture_trigger(struct snd_pcm_substream *substream, int cmd) 291 { 292 struct snd_motu *motu = substream->private_data; 293 294 switch (cmd) { 295 case SNDRV_PCM_TRIGGER_START: 296 amdtp_stream_pcm_trigger(&motu->tx_stream, substream); 297 break; 298 case SNDRV_PCM_TRIGGER_STOP: 299 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL); 300 break; 301 default: 302 return -EINVAL; 303 } 304 305 return 0; 306 } 307 static int playback_trigger(struct snd_pcm_substream *substream, int cmd) 308 { 309 struct snd_motu *motu = substream->private_data; 310 311 switch (cmd) { 312 case SNDRV_PCM_TRIGGER_START: 313 amdtp_stream_pcm_trigger(&motu->rx_stream, substream); 314 break; 315 case SNDRV_PCM_TRIGGER_STOP: 316 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL); 317 break; 318 default: 319 return -EINVAL; 320 } 321 322 return 0; 323 } 324 325 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream) 326 { 327 struct snd_motu *motu = substream->private_data; 328 329 return amdtp_stream_pcm_pointer(&motu->tx_stream); 330 } 331 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream) 332 { 333 struct snd_motu *motu = substream->private_data; 334 335 return amdtp_stream_pcm_pointer(&motu->rx_stream); 336 } 337 338 static int capture_ack(struct snd_pcm_substream *substream) 339 { 340 struct snd_motu *motu = substream->private_data; 341 342 return amdtp_stream_pcm_ack(&motu->tx_stream); 343 } 344 345 static int playback_ack(struct snd_pcm_substream *substream) 346 { 347 struct snd_motu *motu = substream->private_data; 348 349 return amdtp_stream_pcm_ack(&motu->rx_stream); 350 } 351 352 int snd_motu_create_pcm_devices(struct snd_motu *motu) 353 { 354 static const struct snd_pcm_ops capture_ops = { 355 .open = pcm_open, 356 .close = pcm_close, 357 .ioctl = snd_pcm_lib_ioctl, 358 .hw_params = capture_hw_params, 359 .hw_free = capture_hw_free, 360 .prepare = capture_prepare, 361 .trigger = capture_trigger, 362 .pointer = capture_pointer, 363 .ack = capture_ack, 364 .page = snd_pcm_lib_get_vmalloc_page, 365 }; 366 static const struct snd_pcm_ops playback_ops = { 367 .open = pcm_open, 368 .close = pcm_close, 369 .ioctl = snd_pcm_lib_ioctl, 370 .hw_params = playback_hw_params, 371 .hw_free = playback_hw_free, 372 .prepare = playback_prepare, 373 .trigger = playback_trigger, 374 .pointer = playback_pointer, 375 .ack = playback_ack, 376 .page = snd_pcm_lib_get_vmalloc_page, 377 }; 378 struct snd_pcm *pcm; 379 int err; 380 381 err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm); 382 if (err < 0) 383 return err; 384 pcm->private_data = motu; 385 strcpy(pcm->name, motu->card->shortname); 386 387 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 388 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 389 390 return 0; 391 } 392