1 /* 2 * bebob_pcm.c - a part of driver for BeBoB based devices 3 * 4 * Copyright (c) 2013-2014 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include "./bebob.h" 10 11 static int 12 hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 13 { 14 struct snd_bebob_stream_formation *formations = rule->private; 15 struct snd_interval *r = 16 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 17 const struct snd_interval *c = 18 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 19 struct snd_interval t = { 20 .min = UINT_MAX, .max = 0, .integer = 1 21 }; 22 unsigned int i; 23 24 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 25 /* entry is invalid */ 26 if (formations[i].pcm == 0) 27 continue; 28 29 if (!snd_interval_test(c, formations[i].pcm)) 30 continue; 31 32 t.min = min(t.min, snd_bebob_rate_table[i]); 33 t.max = max(t.max, snd_bebob_rate_table[i]); 34 35 } 36 return snd_interval_refine(r, &t); 37 } 38 39 static int 40 hw_rule_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 41 { 42 struct snd_bebob_stream_formation *formations = rule->private; 43 struct snd_interval *c = 44 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 45 const struct snd_interval *r = 46 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 47 struct snd_interval t = { 48 .min = UINT_MAX, .max = 0, .integer = 1 49 }; 50 51 unsigned int i; 52 53 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 54 /* entry is invalid */ 55 if (formations[i].pcm == 0) 56 continue; 57 58 if (!snd_interval_test(r, snd_bebob_rate_table[i])) 59 continue; 60 61 t.min = min(t.min, formations[i].pcm); 62 t.max = max(t.max, formations[i].pcm); 63 } 64 65 return snd_interval_refine(c, &t); 66 } 67 68 static void 69 limit_channels_and_rates(struct snd_pcm_hardware *hw, 70 struct snd_bebob_stream_formation *formations) 71 { 72 unsigned int i; 73 74 hw->channels_min = UINT_MAX; 75 hw->channels_max = 0; 76 77 hw->rate_min = UINT_MAX; 78 hw->rate_max = 0; 79 hw->rates = 0; 80 81 for (i = 0; i < SND_BEBOB_STRM_FMT_ENTRIES; i++) { 82 /* entry has no PCM channels */ 83 if (formations[i].pcm == 0) 84 continue; 85 86 hw->channels_min = min(hw->channels_min, formations[i].pcm); 87 hw->channels_max = max(hw->channels_max, formations[i].pcm); 88 89 hw->rate_min = min(hw->rate_min, snd_bebob_rate_table[i]); 90 hw->rate_max = max(hw->rate_max, snd_bebob_rate_table[i]); 91 hw->rates |= snd_pcm_rate_to_rate_bit(snd_bebob_rate_table[i]); 92 } 93 } 94 95 static void 96 limit_period_and_buffer(struct snd_pcm_hardware *hw) 97 { 98 hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */ 99 hw->periods_max = UINT_MAX; 100 101 hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */ 102 103 /* Just to prevent from allocating much pages. */ 104 hw->period_bytes_max = hw->period_bytes_min * 2048; 105 hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; 106 } 107 108 static int 109 pcm_init_hw_params(struct snd_bebob *bebob, 110 struct snd_pcm_substream *substream) 111 { 112 struct snd_pcm_runtime *runtime = substream->runtime; 113 struct amdtp_stream *s; 114 struct snd_bebob_stream_formation *formations; 115 int err; 116 117 runtime->hw.info = SNDRV_PCM_INFO_BATCH | 118 SNDRV_PCM_INFO_BLOCK_TRANSFER | 119 SNDRV_PCM_INFO_INTERLEAVED | 120 SNDRV_PCM_INFO_JOINT_DUPLEX | 121 SNDRV_PCM_INFO_MMAP | 122 SNDRV_PCM_INFO_MMAP_VALID; 123 124 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 125 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; 126 s = &bebob->tx_stream; 127 formations = bebob->tx_stream_formations; 128 } else { 129 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; 130 s = &bebob->rx_stream; 131 formations = bebob->rx_stream_formations; 132 } 133 134 limit_channels_and_rates(&runtime->hw, formations); 135 limit_period_and_buffer(&runtime->hw); 136 137 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 138 hw_rule_channels, formations, 139 SNDRV_PCM_HW_PARAM_RATE, -1); 140 if (err < 0) 141 goto end; 142 143 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 144 hw_rule_rate, formations, 145 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 146 if (err < 0) 147 goto end; 148 149 err = amdtp_am824_add_pcm_hw_constraints(s, runtime); 150 end: 151 return err; 152 } 153 154 static int 155 pcm_open(struct snd_pcm_substream *substream) 156 { 157 struct snd_bebob *bebob = substream->private_data; 158 const struct snd_bebob_rate_spec *spec = bebob->spec->rate; 159 unsigned int sampling_rate; 160 enum snd_bebob_clock_type src; 161 int err; 162 163 err = snd_bebob_stream_lock_try(bebob); 164 if (err < 0) 165 goto end; 166 167 err = pcm_init_hw_params(bebob, substream); 168 if (err < 0) 169 goto err_locked; 170 171 err = snd_bebob_stream_get_clock_src(bebob, &src); 172 if (err < 0) 173 goto err_locked; 174 175 /* 176 * When source of clock is internal or any PCM stream are running, 177 * the available sampling rate is limited at current sampling rate. 178 */ 179 if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || 180 amdtp_stream_pcm_running(&bebob->tx_stream) || 181 amdtp_stream_pcm_running(&bebob->rx_stream)) { 182 err = spec->get(bebob, &sampling_rate); 183 if (err < 0) { 184 dev_err(&bebob->unit->device, 185 "fail to get sampling rate: %d\n", err); 186 goto err_locked; 187 } 188 189 substream->runtime->hw.rate_min = sampling_rate; 190 substream->runtime->hw.rate_max = sampling_rate; 191 } 192 193 snd_pcm_set_sync(substream); 194 end: 195 return err; 196 err_locked: 197 snd_bebob_stream_lock_release(bebob); 198 return err; 199 } 200 201 static int 202 pcm_close(struct snd_pcm_substream *substream) 203 { 204 struct snd_bebob *bebob = substream->private_data; 205 snd_bebob_stream_lock_release(bebob); 206 return 0; 207 } 208 209 static int 210 pcm_capture_hw_params(struct snd_pcm_substream *substream, 211 struct snd_pcm_hw_params *hw_params) 212 { 213 struct snd_bebob *bebob = substream->private_data; 214 int err; 215 216 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 217 params_buffer_bytes(hw_params)); 218 if (err < 0) 219 return err; 220 221 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 222 mutex_lock(&bebob->mutex); 223 bebob->substreams_counter++; 224 mutex_unlock(&bebob->mutex); 225 } 226 227 amdtp_am824_set_pcm_format(&bebob->tx_stream, params_format(hw_params)); 228 229 return 0; 230 } 231 static int 232 pcm_playback_hw_params(struct snd_pcm_substream *substream, 233 struct snd_pcm_hw_params *hw_params) 234 { 235 struct snd_bebob *bebob = substream->private_data; 236 int err; 237 238 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 239 params_buffer_bytes(hw_params)); 240 if (err < 0) 241 return err; 242 243 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 244 mutex_lock(&bebob->mutex); 245 bebob->substreams_counter++; 246 mutex_unlock(&bebob->mutex); 247 } 248 249 amdtp_am824_set_pcm_format(&bebob->rx_stream, params_format(hw_params)); 250 251 return 0; 252 } 253 254 static int 255 pcm_capture_hw_free(struct snd_pcm_substream *substream) 256 { 257 struct snd_bebob *bebob = substream->private_data; 258 259 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) { 260 mutex_lock(&bebob->mutex); 261 bebob->substreams_counter--; 262 mutex_unlock(&bebob->mutex); 263 } 264 265 snd_bebob_stream_stop_duplex(bebob); 266 267 return snd_pcm_lib_free_vmalloc_buffer(substream); 268 } 269 static int 270 pcm_playback_hw_free(struct snd_pcm_substream *substream) 271 { 272 struct snd_bebob *bebob = substream->private_data; 273 274 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) { 275 mutex_lock(&bebob->mutex); 276 bebob->substreams_counter--; 277 mutex_unlock(&bebob->mutex); 278 } 279 280 snd_bebob_stream_stop_duplex(bebob); 281 282 return snd_pcm_lib_free_vmalloc_buffer(substream); 283 } 284 285 static int 286 pcm_capture_prepare(struct snd_pcm_substream *substream) 287 { 288 struct snd_bebob *bebob = substream->private_data; 289 struct snd_pcm_runtime *runtime = substream->runtime; 290 int err; 291 292 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 293 if (err >= 0) 294 amdtp_stream_pcm_prepare(&bebob->tx_stream); 295 296 return err; 297 } 298 static int 299 pcm_playback_prepare(struct snd_pcm_substream *substream) 300 { 301 struct snd_bebob *bebob = substream->private_data; 302 struct snd_pcm_runtime *runtime = substream->runtime; 303 int err; 304 305 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 306 if (err >= 0) 307 amdtp_stream_pcm_prepare(&bebob->rx_stream); 308 309 return err; 310 } 311 312 static int 313 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 314 { 315 struct snd_bebob *bebob = substream->private_data; 316 317 switch (cmd) { 318 case SNDRV_PCM_TRIGGER_START: 319 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); 320 break; 321 case SNDRV_PCM_TRIGGER_STOP: 322 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); 323 break; 324 default: 325 return -EINVAL; 326 } 327 328 return 0; 329 } 330 static int 331 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 332 { 333 struct snd_bebob *bebob = substream->private_data; 334 335 switch (cmd) { 336 case SNDRV_PCM_TRIGGER_START: 337 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); 338 break; 339 case SNDRV_PCM_TRIGGER_STOP: 340 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); 341 break; 342 default: 343 return -EINVAL; 344 } 345 346 return 0; 347 } 348 349 static snd_pcm_uframes_t 350 pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 351 { 352 struct snd_bebob *bebob = sbstrm->private_data; 353 return amdtp_stream_pcm_pointer(&bebob->tx_stream); 354 } 355 static snd_pcm_uframes_t 356 pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 357 { 358 struct snd_bebob *bebob = sbstrm->private_data; 359 return amdtp_stream_pcm_pointer(&bebob->rx_stream); 360 } 361 362 static const struct snd_pcm_ops pcm_capture_ops = { 363 .open = pcm_open, 364 .close = pcm_close, 365 .ioctl = snd_pcm_lib_ioctl, 366 .hw_params = pcm_capture_hw_params, 367 .hw_free = pcm_capture_hw_free, 368 .prepare = pcm_capture_prepare, 369 .trigger = pcm_capture_trigger, 370 .pointer = pcm_capture_pointer, 371 .page = snd_pcm_lib_get_vmalloc_page, 372 }; 373 static const struct snd_pcm_ops pcm_playback_ops = { 374 .open = pcm_open, 375 .close = pcm_close, 376 .ioctl = snd_pcm_lib_ioctl, 377 .hw_params = pcm_playback_hw_params, 378 .hw_free = pcm_playback_hw_free, 379 .prepare = pcm_playback_prepare, 380 .trigger = pcm_playback_trigger, 381 .pointer = pcm_playback_pointer, 382 .page = snd_pcm_lib_get_vmalloc_page, 383 .mmap = snd_pcm_lib_mmap_vmalloc, 384 }; 385 386 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) 387 { 388 struct snd_pcm *pcm; 389 int err; 390 391 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); 392 if (err < 0) 393 goto end; 394 395 pcm->private_data = bebob; 396 snprintf(pcm->name, sizeof(pcm->name), 397 "%s PCM", bebob->card->shortname); 398 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops); 399 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops); 400 end: 401 return err; 402 } 403