1 /* 2 * motu-pcm.c - a part of driver for MOTU FireWire series 3 * 4 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp> 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include <sound/pcm_params.h> 10 #include "motu.h" 11 12 static int motu_rate_constraint(struct snd_pcm_hw_params *params, 13 struct snd_pcm_hw_rule *rule) 14 { 15 struct snd_motu_packet_format *formats = rule->private; 16 17 const struct snd_interval *c = 18 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 19 struct snd_interval *r = 20 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 21 struct snd_interval rates = { 22 .min = UINT_MAX, .max = 0, .integer = 1 23 }; 24 unsigned int i, pcm_channels, rate, mode; 25 26 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 27 rate = snd_motu_clock_rates[i]; 28 mode = i / 2; 29 30 pcm_channels = formats->fixed_part_pcm_chunks[mode] + 31 formats->differed_part_pcm_chunks[mode]; 32 if (!snd_interval_test(c, pcm_channels)) 33 continue; 34 35 rates.min = min(rates.min, rate); 36 rates.max = max(rates.max, rate); 37 } 38 39 return snd_interval_refine(r, &rates); 40 } 41 42 static int motu_channels_constraint(struct snd_pcm_hw_params *params, 43 struct snd_pcm_hw_rule *rule) 44 { 45 struct snd_motu_packet_format *formats = rule->private; 46 47 const struct snd_interval *r = 48 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 49 struct snd_interval *c = 50 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 51 struct snd_interval channels = { 52 .min = UINT_MAX, .max = 0, .integer = 1 53 }; 54 unsigned int i, pcm_channels, rate, mode; 55 56 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 57 rate = snd_motu_clock_rates[i]; 58 mode = i / 2; 59 60 if (!snd_interval_test(r, rate)) 61 continue; 62 63 pcm_channels = formats->fixed_part_pcm_chunks[mode] + 64 formats->differed_part_pcm_chunks[mode]; 65 channels.min = min(channels.min, pcm_channels); 66 channels.max = max(channels.max, pcm_channels); 67 } 68 69 return snd_interval_refine(c, &channels); 70 } 71 72 static void limit_channels_and_rates(struct snd_motu *motu, 73 struct snd_pcm_runtime *runtime, 74 struct snd_motu_packet_format *formats) 75 { 76 struct snd_pcm_hardware *hw = &runtime->hw; 77 unsigned int i, pcm_channels, rate, mode; 78 79 hw->channels_min = UINT_MAX; 80 hw->channels_max = 0; 81 82 for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { 83 rate = snd_motu_clock_rates[i]; 84 mode = i / 2; 85 86 pcm_channels = formats->fixed_part_pcm_chunks[mode] + 87 formats->differed_part_pcm_chunks[mode]; 88 if (pcm_channels == 0) 89 continue; 90 91 hw->rates |= snd_pcm_rate_to_rate_bit(rate); 92 hw->channels_min = min(hw->channels_min, pcm_channels); 93 hw->channels_max = max(hw->channels_max, pcm_channels); 94 } 95 96 snd_pcm_limit_hw_rates(runtime); 97 } 98 99 static int init_hw_info(struct snd_motu *motu, 100 struct snd_pcm_substream *substream) 101 { 102 struct snd_pcm_runtime *runtime = substream->runtime; 103 struct snd_pcm_hardware *hw = &runtime->hw; 104 struct amdtp_stream *stream; 105 struct snd_motu_packet_format *formats; 106 int err; 107 108 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 109 hw->formats = SNDRV_PCM_FMTBIT_S32; 110 stream = &motu->tx_stream; 111 formats = &motu->tx_packet_formats; 112 } else { 113 hw->formats = SNDRV_PCM_FMTBIT_S32; 114 stream = &motu->rx_stream; 115 formats = &motu->rx_packet_formats; 116 } 117 118 limit_channels_and_rates(motu, runtime, formats); 119 120 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 121 motu_rate_constraint, formats, 122 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 123 if (err < 0) 124 return err; 125 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 126 motu_channels_constraint, formats, 127 SNDRV_PCM_HW_PARAM_RATE, -1); 128 if (err < 0) 129 return err; 130 131 return amdtp_motu_add_pcm_hw_constraints(stream, runtime); 132 } 133 134 static int pcm_open(struct snd_pcm_substream *substream) 135 { 136 struct snd_motu *motu = substream->private_data; 137 const struct snd_motu_protocol *const protocol = motu->spec->protocol; 138 enum snd_motu_clock_source src; 139 unsigned int rate; 140 int err; 141 142 err = snd_motu_stream_lock_try(motu); 143 if (err < 0) 144 return err; 145 146 mutex_lock(&motu->mutex); 147 148 err = snd_motu_stream_cache_packet_formats(motu); 149 if (err < 0) 150 goto err_locked; 151 152 err = init_hw_info(motu, substream); 153 if (err < 0) 154 goto err_locked; 155 156 /* 157 * When source of clock is not internal or any PCM streams are running, 158 * available sampling rate is limited at current sampling rate. 159 */ 160 err = protocol->get_clock_source(motu, &src); 161 if (err < 0) 162 goto err_locked; 163 if (src != SND_MOTU_CLOCK_SOURCE_INTERNAL || 164 amdtp_stream_pcm_running(&motu->tx_stream) || 165 amdtp_stream_pcm_running(&motu->rx_stream)) { 166 err = protocol->get_clock_rate(motu, &rate); 167 if (err < 0) 168 goto err_locked; 169 substream->runtime->hw.rate_min = rate; 170 substream->runtime->hw.rate_max = rate; 171 } 172 173 snd_pcm_set_sync(substream); 174 175 mutex_unlock(&motu->mutex); 176 177 return err; 178 err_locked: 179 mutex_unlock(&motu->mutex); 180 snd_motu_stream_lock_release(motu); 181 return err; 182 } 183 184 static int pcm_close(struct snd_pcm_substream *substream) 185 { 186 struct snd_motu *motu = substream->private_data; 187 188 snd_motu_stream_lock_release(motu); 189 190 return 0; 191 } 192 193 static int capture_hw_params(struct snd_pcm_substream *substream, 194 struct snd_pcm_hw_params *hw_params) 195 { 196 struct snd_motu *motu = substream->private_data; 197 int err; 198 199 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 200 params_buffer_bytes(hw_params)); 201 if (err < 0) 202 return err; 203 204 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 205 mutex_lock(&motu->mutex); 206 motu->capture_substreams++; 207 mutex_unlock(&motu->mutex); 208 } 209 210 return 0; 211 } 212 static int playback_hw_params(struct snd_pcm_substream *substream, 213 struct snd_pcm_hw_params *hw_params) 214 { 215 struct snd_motu *motu = substream->private_data; 216 int err; 217 218 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 219 params_buffer_bytes(hw_params)); 220 if (err < 0) 221 return err; 222 223 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 224 mutex_lock(&motu->mutex); 225 motu->playback_substreams++; 226 mutex_unlock(&motu->mutex); 227 } 228 229 return 0; 230 } 231 232 static int capture_hw_free(struct snd_pcm_substream *substream) 233 { 234 struct snd_motu *motu = substream->private_data; 235 236 mutex_lock(&motu->mutex); 237 238 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 239 motu->capture_substreams--; 240 241 snd_motu_stream_stop_duplex(motu); 242 243 mutex_unlock(&motu->mutex); 244 245 return snd_pcm_lib_free_vmalloc_buffer(substream); 246 } 247 248 static int playback_hw_free(struct snd_pcm_substream *substream) 249 { 250 struct snd_motu *motu = substream->private_data; 251 252 mutex_lock(&motu->mutex); 253 254 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 255 motu->playback_substreams--; 256 257 snd_motu_stream_stop_duplex(motu); 258 259 mutex_unlock(&motu->mutex); 260 261 return snd_pcm_lib_free_vmalloc_buffer(substream); 262 } 263 264 static int capture_prepare(struct snd_pcm_substream *substream) 265 { 266 struct snd_motu *motu = substream->private_data; 267 int err; 268 269 mutex_lock(&motu->mutex); 270 err = snd_motu_stream_start_duplex(motu, substream->runtime->rate); 271 mutex_unlock(&motu->mutex); 272 if (err >= 0) 273 amdtp_stream_pcm_prepare(&motu->tx_stream); 274 275 return 0; 276 } 277 static int playback_prepare(struct snd_pcm_substream *substream) 278 { 279 struct snd_motu *motu = substream->private_data; 280 int err; 281 282 mutex_lock(&motu->mutex); 283 err = snd_motu_stream_start_duplex(motu, substream->runtime->rate); 284 mutex_unlock(&motu->mutex); 285 if (err >= 0) 286 amdtp_stream_pcm_prepare(&motu->rx_stream); 287 288 return err; 289 } 290 291 static int capture_trigger(struct snd_pcm_substream *substream, int cmd) 292 { 293 struct snd_motu *motu = substream->private_data; 294 295 switch (cmd) { 296 case SNDRV_PCM_TRIGGER_START: 297 amdtp_stream_pcm_trigger(&motu->tx_stream, substream); 298 break; 299 case SNDRV_PCM_TRIGGER_STOP: 300 amdtp_stream_pcm_trigger(&motu->tx_stream, NULL); 301 break; 302 default: 303 return -EINVAL; 304 } 305 306 return 0; 307 } 308 static int playback_trigger(struct snd_pcm_substream *substream, int cmd) 309 { 310 struct snd_motu *motu = substream->private_data; 311 312 switch (cmd) { 313 case SNDRV_PCM_TRIGGER_START: 314 amdtp_stream_pcm_trigger(&motu->rx_stream, substream); 315 break; 316 case SNDRV_PCM_TRIGGER_STOP: 317 amdtp_stream_pcm_trigger(&motu->rx_stream, NULL); 318 break; 319 default: 320 return -EINVAL; 321 } 322 323 return 0; 324 } 325 326 static snd_pcm_uframes_t capture_pointer(struct snd_pcm_substream *substream) 327 { 328 struct snd_motu *motu = substream->private_data; 329 330 return amdtp_stream_pcm_pointer(&motu->tx_stream); 331 } 332 static snd_pcm_uframes_t playback_pointer(struct snd_pcm_substream *substream) 333 { 334 struct snd_motu *motu = substream->private_data; 335 336 return amdtp_stream_pcm_pointer(&motu->rx_stream); 337 } 338 339 static int capture_ack(struct snd_pcm_substream *substream) 340 { 341 struct snd_motu *motu = substream->private_data; 342 343 return amdtp_stream_pcm_ack(&motu->tx_stream); 344 } 345 346 static int playback_ack(struct snd_pcm_substream *substream) 347 { 348 struct snd_motu *motu = substream->private_data; 349 350 return amdtp_stream_pcm_ack(&motu->rx_stream); 351 } 352 353 int snd_motu_create_pcm_devices(struct snd_motu *motu) 354 { 355 static const struct snd_pcm_ops capture_ops = { 356 .open = pcm_open, 357 .close = pcm_close, 358 .ioctl = snd_pcm_lib_ioctl, 359 .hw_params = capture_hw_params, 360 .hw_free = capture_hw_free, 361 .prepare = capture_prepare, 362 .trigger = capture_trigger, 363 .pointer = capture_pointer, 364 .ack = capture_ack, 365 .page = snd_pcm_lib_get_vmalloc_page, 366 .mmap = snd_pcm_lib_mmap_vmalloc, 367 }; 368 static const struct snd_pcm_ops playback_ops = { 369 .open = pcm_open, 370 .close = pcm_close, 371 .ioctl = snd_pcm_lib_ioctl, 372 .hw_params = playback_hw_params, 373 .hw_free = playback_hw_free, 374 .prepare = playback_prepare, 375 .trigger = playback_trigger, 376 .pointer = playback_pointer, 377 .ack = playback_ack, 378 .page = snd_pcm_lib_get_vmalloc_page, 379 .mmap = snd_pcm_lib_mmap_vmalloc, 380 }; 381 struct snd_pcm *pcm; 382 int err; 383 384 err = snd_pcm_new(motu->card, motu->card->driver, 0, 1, 1, &pcm); 385 if (err < 0) 386 return err; 387 pcm->private_data = motu; 388 strcpy(pcm->name, motu->card->shortname); 389 390 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 391 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 392 393 return 0; 394 } 395