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 int 96 pcm_init_hw_params(struct snd_bebob *bebob, 97 struct snd_pcm_substream *substream) 98 { 99 struct snd_pcm_runtime *runtime = substream->runtime; 100 struct amdtp_stream *s; 101 struct snd_bebob_stream_formation *formations; 102 int err; 103 104 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 105 runtime->hw.formats = AM824_IN_PCM_FORMAT_BITS; 106 s = &bebob->tx_stream; 107 formations = bebob->tx_stream_formations; 108 } else { 109 runtime->hw.formats = AM824_OUT_PCM_FORMAT_BITS; 110 s = &bebob->rx_stream; 111 formations = bebob->rx_stream_formations; 112 } 113 114 limit_channels_and_rates(&runtime->hw, formations); 115 116 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 117 hw_rule_channels, formations, 118 SNDRV_PCM_HW_PARAM_RATE, -1); 119 if (err < 0) 120 goto end; 121 122 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 123 hw_rule_rate, formations, 124 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 125 if (err < 0) 126 goto end; 127 128 err = amdtp_am824_add_pcm_hw_constraints(s, runtime); 129 end: 130 return err; 131 } 132 133 static int 134 pcm_open(struct snd_pcm_substream *substream) 135 { 136 struct snd_bebob *bebob = substream->private_data; 137 const struct snd_bebob_rate_spec *spec = bebob->spec->rate; 138 unsigned int sampling_rate; 139 enum snd_bebob_clock_type src; 140 int err; 141 142 err = snd_bebob_stream_lock_try(bebob); 143 if (err < 0) 144 goto end; 145 146 err = pcm_init_hw_params(bebob, substream); 147 if (err < 0) 148 goto err_locked; 149 150 err = snd_bebob_stream_get_clock_src(bebob, &src); 151 if (err < 0) 152 goto err_locked; 153 154 /* 155 * When source of clock is internal or any PCM stream are running, 156 * the available sampling rate is limited at current sampling rate. 157 */ 158 if (src == SND_BEBOB_CLOCK_TYPE_EXTERNAL || 159 amdtp_stream_pcm_running(&bebob->tx_stream) || 160 amdtp_stream_pcm_running(&bebob->rx_stream)) { 161 err = spec->get(bebob, &sampling_rate); 162 if (err < 0) { 163 dev_err(&bebob->unit->device, 164 "fail to get sampling rate: %d\n", err); 165 goto err_locked; 166 } 167 168 substream->runtime->hw.rate_min = sampling_rate; 169 substream->runtime->hw.rate_max = sampling_rate; 170 } 171 172 snd_pcm_set_sync(substream); 173 end: 174 return err; 175 err_locked: 176 snd_bebob_stream_lock_release(bebob); 177 return err; 178 } 179 180 static int 181 pcm_close(struct snd_pcm_substream *substream) 182 { 183 struct snd_bebob *bebob = substream->private_data; 184 snd_bebob_stream_lock_release(bebob); 185 return 0; 186 } 187 188 static int 189 pcm_capture_hw_params(struct snd_pcm_substream *substream, 190 struct snd_pcm_hw_params *hw_params) 191 { 192 struct snd_bebob *bebob = substream->private_data; 193 int err; 194 195 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 196 params_buffer_bytes(hw_params)); 197 if (err < 0) 198 return err; 199 200 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 201 mutex_lock(&bebob->mutex); 202 bebob->substreams_counter++; 203 mutex_unlock(&bebob->mutex); 204 } 205 206 return 0; 207 } 208 static int 209 pcm_playback_hw_params(struct snd_pcm_substream *substream, 210 struct snd_pcm_hw_params *hw_params) 211 { 212 struct snd_bebob *bebob = substream->private_data; 213 int err; 214 215 err = snd_pcm_lib_alloc_vmalloc_buffer(substream, 216 params_buffer_bytes(hw_params)); 217 if (err < 0) 218 return err; 219 220 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) { 221 mutex_lock(&bebob->mutex); 222 bebob->substreams_counter++; 223 mutex_unlock(&bebob->mutex); 224 } 225 226 return 0; 227 } 228 229 static int 230 pcm_capture_hw_free(struct snd_pcm_substream *substream) 231 { 232 struct snd_bebob *bebob = substream->private_data; 233 234 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) { 235 mutex_lock(&bebob->mutex); 236 bebob->substreams_counter--; 237 mutex_unlock(&bebob->mutex); 238 } 239 240 snd_bebob_stream_stop_duplex(bebob); 241 242 return snd_pcm_lib_free_vmalloc_buffer(substream); 243 } 244 static int 245 pcm_playback_hw_free(struct snd_pcm_substream *substream) 246 { 247 struct snd_bebob *bebob = substream->private_data; 248 249 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) { 250 mutex_lock(&bebob->mutex); 251 bebob->substreams_counter--; 252 mutex_unlock(&bebob->mutex); 253 } 254 255 snd_bebob_stream_stop_duplex(bebob); 256 257 return snd_pcm_lib_free_vmalloc_buffer(substream); 258 } 259 260 static int 261 pcm_capture_prepare(struct snd_pcm_substream *substream) 262 { 263 struct snd_bebob *bebob = substream->private_data; 264 struct snd_pcm_runtime *runtime = substream->runtime; 265 int err; 266 267 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 268 if (err >= 0) 269 amdtp_stream_pcm_prepare(&bebob->tx_stream); 270 271 return err; 272 } 273 static int 274 pcm_playback_prepare(struct snd_pcm_substream *substream) 275 { 276 struct snd_bebob *bebob = substream->private_data; 277 struct snd_pcm_runtime *runtime = substream->runtime; 278 int err; 279 280 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 281 if (err >= 0) 282 amdtp_stream_pcm_prepare(&bebob->rx_stream); 283 284 return err; 285 } 286 287 static int 288 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 289 { 290 struct snd_bebob *bebob = substream->private_data; 291 292 switch (cmd) { 293 case SNDRV_PCM_TRIGGER_START: 294 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); 295 break; 296 case SNDRV_PCM_TRIGGER_STOP: 297 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); 298 break; 299 default: 300 return -EINVAL; 301 } 302 303 return 0; 304 } 305 static int 306 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 307 { 308 struct snd_bebob *bebob = substream->private_data; 309 310 switch (cmd) { 311 case SNDRV_PCM_TRIGGER_START: 312 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); 313 break; 314 case SNDRV_PCM_TRIGGER_STOP: 315 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); 316 break; 317 default: 318 return -EINVAL; 319 } 320 321 return 0; 322 } 323 324 static snd_pcm_uframes_t 325 pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 326 { 327 struct snd_bebob *bebob = sbstrm->private_data; 328 return amdtp_stream_pcm_pointer(&bebob->tx_stream); 329 } 330 static snd_pcm_uframes_t 331 pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 332 { 333 struct snd_bebob *bebob = sbstrm->private_data; 334 return amdtp_stream_pcm_pointer(&bebob->rx_stream); 335 } 336 337 static int pcm_capture_ack(struct snd_pcm_substream *substream) 338 { 339 struct snd_bebob *bebob = substream->private_data; 340 341 return amdtp_stream_pcm_ack(&bebob->tx_stream); 342 } 343 344 static int pcm_playback_ack(struct snd_pcm_substream *substream) 345 { 346 struct snd_bebob *bebob = substream->private_data; 347 348 return amdtp_stream_pcm_ack(&bebob->rx_stream); 349 } 350 351 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) 352 { 353 static const struct snd_pcm_ops capture_ops = { 354 .open = pcm_open, 355 .close = pcm_close, 356 .ioctl = snd_pcm_lib_ioctl, 357 .hw_params = pcm_capture_hw_params, 358 .hw_free = pcm_capture_hw_free, 359 .prepare = pcm_capture_prepare, 360 .trigger = pcm_capture_trigger, 361 .pointer = pcm_capture_pointer, 362 .ack = pcm_capture_ack, 363 .page = snd_pcm_lib_get_vmalloc_page, 364 }; 365 static const struct snd_pcm_ops playback_ops = { 366 .open = pcm_open, 367 .close = pcm_close, 368 .ioctl = snd_pcm_lib_ioctl, 369 .hw_params = pcm_playback_hw_params, 370 .hw_free = pcm_playback_hw_free, 371 .prepare = pcm_playback_prepare, 372 .trigger = pcm_playback_trigger, 373 .pointer = pcm_playback_pointer, 374 .ack = pcm_playback_ack, 375 .page = snd_pcm_lib_get_vmalloc_page, 376 .mmap = snd_pcm_lib_mmap_vmalloc, 377 }; 378 struct snd_pcm *pcm; 379 int err; 380 381 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); 382 if (err < 0) 383 goto end; 384 385 pcm->private_data = bebob; 386 snprintf(pcm->name, sizeof(pcm->name), 387 "%s PCM", bebob->card->shortname); 388 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &playback_ops); 389 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &capture_ops); 390 end: 391 return err; 392 } 393