1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * bebob_pcm.c - a part of driver for BeBoB based devices 4 * 5 * Copyright (c) 2013-2014 Takashi Sakamoto 6 */ 7 8 #include "./bebob.h" 9 10 static int 11 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 12 { 13 struct snd_bebob_stream_formation *formations = rule->private; 14 struct snd_interval *r = 15 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 16 const struct snd_interval *c = 17 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 18 struct snd_interval t = { 19 .min = UINT_MAX, .max = 0, .integer = 1 20 }; 21 unsigned int i; 22 23 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 24 /* entry is invalid */ 25 if (formations[i].pcm == 0) 26 continue; 27 28 if (!snd_interval_test(c, formations[i].pcm)) 29 continue; 30 31 t.min = min(t.min, snd_bebob_rate_table[i]); 32 t.max = max(t.max, snd_bebob_rate_table[i]); 33 34 } 35 return snd_interval_refine(r, &t); 36 } 37 38 static int 39 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 40 { 41 struct snd_bebob_stream_formation *formations = rule->private; 42 struct snd_interval *c = 43 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 44 const struct snd_interval *r = 45 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 46 struct snd_interval t = { 47 .min = UINT_MAX, .max = 0, .integer = 1 48 }; 49 50 unsigned int i; 51 52 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 53 /* entry is invalid */ 54 if (formations[i].pcm == 0) 55 continue; 56 57 if (!snd_interval_test(r, snd_bebob_rate_table[i])) 58 continue; 59 60 t.min = min(t.min, formations[i].pcm); 61 t.max = max(t.max, formations[i].pcm); 62 } 63 64 return snd_interval_refine(c, &t); 65 } 66 67 static void 68 limit_channels_and_rates(struct snd_pcm_hardware *hw, 69 struct snd_bebob_stream_formation *formations) 70 { 71 unsigned int i; 72 73 hw->channels_min = UINT_MAX; 74 hw->channels_max = 0; 75 76 hw->rate_min = UINT_MAX; 77 hw->rate_max = 0; 78 hw->rates = 0; 79 80 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 81 /* entry has no PCM channels */ 82 if (formations[i].pcm == 0) 83 continue; 84 85 hw->channels_min = min(hw->channels_min, formations[i].pcm); 86 hw->channels_max = max(hw->channels_max, formations[i].pcm); 87 88 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); 89 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); 90 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); 91 } 92 } 93 94 static int 95 pcm_init_hw_params(struct snd_bebob *bebob, 96 struct snd_pcm_substream *substream) 97 { 98 struct snd_pcm_runtime *runtime = substream->runtime; 99 struct amdtp_stream *s; 100 struct snd_bebob_stream_formation *formations; 101 int err; 102 103 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 104 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; 105 s = &bebob->tx_stream; 106 formations = bebob->tx_stream_formations; 107 } else { 108 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; 109 s = &bebob->rx_stream; 110 formations = bebob->rx_stream_formations; 111 } 112 113 limit_channels_and_rates(&runtime->hw, formations); 114 115 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 116 hw_rule_channels, formations, 117 SNDRV_PCM_HW_PARAM_RATE, -1); 118 if (err < 0) 119 goto end; 120 121 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 122 hw_rule_rate, formations, 123 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 124 if (err < 0) 125 goto end; 126 127 err = amdtp_am824_add_pcm_hw_constraints(s, runtime); 128 end: 129 return err; 130 } 131 132 static int pcm_open(struct snd_pcm_substream *substream) 133 { 134 struct snd_bebob *bebob = substream->private_data; 135 const struct snd_bebob_rate_spec *spec = bebob->spec->rate; 136 struct amdtp_domain *d = &bebob->domain; 137 enum snd_bebob_clock_type src; 138 int err; 139 140 err = snd_bebob_stream_lock_try(bebob); 141 if (err < 0) 142 return err; 143 144 err = pcm_init_hw_params(bebob, substream); 145 if (err < 0) 146 goto err_locked; 147 148 err = snd_bebob_stream_get_clock_src(bebob, &src); 149 if (err < 0) 150 goto err_locked; 151 152 mutex_lock(&bebob->mutex); 153 154 // When source of clock is not internal or any stream is reserved for 155 // transmission of PCM frames, the available sampling rate is limited 156 // at current one. 157 if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || 158 (bebob->substreams_counter > 0 && d->events_per_period > 0)) { 159 unsigned int frames_per_period = d->events_per_period; 160 unsigned int frames_per_buffer = d->events_per_buffer; 161 unsigned int sampling_rate; 162 163 err = spec->get(bebob, &sampling_rate); 164 if (err < 0) { 165 mutex_unlock(&bebob->mutex); 166 dev_err(&bebob->unit->device, 167 "fail to get sampling rate: %d\n", err); 168 goto err_locked; 169 } 170 171 substream->runtime->hw.rate_min = sampling_rate; 172 substream->runtime->hw.rate_max = sampling_rate; 173 174 if (frames_per_period > 0) { 175 err = snd_pcm_hw_constraint_minmax(substream->runtime, 176 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 177 frames_per_period, frames_per_period); 178 if (err < 0) { 179 mutex_unlock(&bebob->mutex); 180 goto err_locked; 181 } 182 183 err = snd_pcm_hw_constraint_minmax(substream->runtime, 184 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 185 frames_per_buffer, frames_per_buffer); 186 if (err < 0) { 187 mutex_unlock(&bebob->mutex); 188 goto err_locked; 189 } 190 } 191 } 192 193 mutex_unlock(&bebob->mutex); 194 195 snd_pcm_set_sync(substream); 196 197 return 0; 198 err_locked: 199 snd_bebob_stream_lock_release(bebob); 200 return err; 201 } 202 203 static int 204 pcm_close(struct snd_pcm_substream *substream) 205 { 206 struct snd_bebob *bebob = substream->private_data; 207 snd_bebob_stream_lock_release(bebob); 208 return 0; 209 } 210 211 static int pcm_hw_params(struct snd_pcm_substream *substream, 212 struct snd_pcm_hw_params *hw_params) 213 { 214 struct snd_bebob *bebob = substream->private_data; 215 int err = 0; 216 217 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 218 unsigned int rate = params_rate(hw_params); 219 unsigned int frames_per_period = params_period_size(hw_params); 220 unsigned int frames_per_buffer = params_buffer_size(hw_params); 221 222 mutex_lock(&bebob->mutex); 223 err = snd_bebob_stream_reserve_duplex(bebob, rate, 224 frames_per_period, frames_per_buffer); 225 if (err >= 0) 226 ++bebob->substreams_counter; 227 mutex_unlock(&bebob->mutex); 228 } 229 230 return err; 231 } 232 233 static int pcm_hw_free(struct snd_pcm_substream *substream) 234 { 235 struct snd_bebob *bebob = substream->private_data; 236 237 mutex_lock(&bebob->mutex); 238 239 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 240 bebob->substreams_counter--; 241 242 snd_bebob_stream_stop_duplex(bebob); 243 244 mutex_unlock(&bebob->mutex); 245 246 return 0; 247 } 248 249 static int 250 pcm_capture_prepare(struct snd_pcm_substream *substream) 251 { 252 struct snd_bebob *bebob = substream->private_data; 253 int err; 254 255 err = snd_bebob_stream_start_duplex(bebob); 256 if (err >= 0) 257 amdtp_stream_pcm_prepare(&bebob->tx_stream); 258 259 return err; 260 } 261 static int 262 pcm_playback_prepare(struct snd_pcm_substream *substream) 263 { 264 struct snd_bebob *bebob = substream->private_data; 265 int err; 266 267 err = snd_bebob_stream_start_duplex(bebob); 268 if (err >= 0) 269 amdtp_stream_pcm_prepare(&bebob->rx_stream); 270 271 return err; 272 } 273 274 static int 275 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 276 { 277 struct snd_bebob *bebob = substream->private_data; 278 279 switch (cmd) { 280 case SNDRV_PCM_TRIGGER_START: 281 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); 282 break; 283 case SNDRV_PCM_TRIGGER_STOP: 284 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); 285 break; 286 default: 287 return -EINVAL; 288 } 289 290 return 0; 291 } 292 static int 293 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 294 { 295 struct snd_bebob *bebob = substream->private_data; 296 297 switch (cmd) { 298 case SNDRV_PCM_TRIGGER_START: 299 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); 300 break; 301 case SNDRV_PCM_TRIGGER_STOP: 302 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); 303 break; 304 default: 305 return -EINVAL; 306 } 307 308 return 0; 309 } 310 311 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 312 { 313 struct snd_bebob *bebob = sbstrm->private_data; 314 315 return amdtp_domain_stream_pcm_pointer(&bebob->domain, 316 &bebob->tx_stream); 317 } 318 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 319 { 320 struct snd_bebob *bebob = sbstrm->private_data; 321 322 return amdtp_domain_stream_pcm_pointer(&bebob->domain, 323 &bebob->rx_stream); 324 } 325 326 static int pcm_capture_ack(struct snd_pcm_substream *substream) 327 { 328 struct snd_bebob *bebob = substream->private_data; 329 330 return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->tx_stream); 331 } 332 333 static int pcm_playback_ack(struct snd_pcm_substream *substream) 334 { 335 struct snd_bebob *bebob = substream->private_data; 336 337 return amdtp_domain_stream_pcm_ack(&bebob->domain, &bebob->rx_stream); 338 } 339 340 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) 341 { 342 static const struct snd_pcm_ops capture_ops = { 343 .open = pcm_open, 344 .close = pcm_close, 345 .hw_params = pcm_hw_params, 346 .hw_free = pcm_hw_free, 347 .prepare = pcm_capture_prepare, 348 .trigger = pcm_capture_trigger, 349 .pointer = pcm_capture_pointer, 350 .ack = pcm_capture_ack, 351 }; 352 static const struct snd_pcm_ops playback_ops = { 353 .open = pcm_open, 354 .close = pcm_close, 355 .hw_params = pcm_hw_params, 356 .hw_free = pcm_hw_free, 357 .prepare = pcm_playback_prepare, 358 .trigger = pcm_playback_trigger, 359 .pointer = pcm_playback_pointer, 360 .ack = pcm_playback_ack, 361 }; 362 struct snd_pcm *pcm; 363 int err; 364 365 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); 366 if (err < 0) 367 goto end; 368 369 pcm->private_data = bebob; 370 snprintf(pcm->name, sizeof(pcm->name), 371 "%s PCM", bebob->card->shortname); 372 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 373 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 374 snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_VMALLOC, NULL, 0, 0); 375 end: 376 return err; 377 } 378