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 = AMDTP_IN_PCM_FORMAT_BITS; 126 s = &bebob->tx_stream; 127 formations = bebob->tx_stream_formations; 128 } else { 129 runtime->hw.formats = AMDTP_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_stream_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 struct snd_bebob_rate_spec *spec = bebob->spec->rate; 159 unsigned int sampling_rate; 160 bool internal; 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_check_internal_clock(bebob, &internal); 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 (!internal || 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; 214 215 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) 216 atomic_inc(&bebob->capture_substreams); 217 amdtp_stream_set_pcm_format(&bebob->tx_stream, 218 params_format(hw_params)); 219 return snd_pcm_lib_alloc_vmalloc_buffer(substream, 220 params_buffer_bytes(hw_params)); 221 } 222 static int 223 pcm_playback_hw_params(struct snd_pcm_substream *substream, 224 struct snd_pcm_hw_params *hw_params) 225 { 226 struct snd_bebob *bebob = substream->private_data; 227 228 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN) 229 atomic_inc(&bebob->playback_substreams); 230 amdtp_stream_set_pcm_format(&bebob->rx_stream, 231 params_format(hw_params)); 232 return snd_pcm_lib_alloc_vmalloc_buffer(substream, 233 params_buffer_bytes(hw_params)); 234 } 235 236 static int 237 pcm_capture_hw_free(struct snd_pcm_substream *substream) 238 { 239 struct snd_bebob *bebob = substream->private_data; 240 241 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 242 atomic_dec(&bebob->capture_substreams); 243 244 snd_bebob_stream_stop_duplex(bebob); 245 246 return snd_pcm_lib_free_vmalloc_buffer(substream); 247 } 248 static int 249 pcm_playback_hw_free(struct snd_pcm_substream *substream) 250 { 251 struct snd_bebob *bebob = substream->private_data; 252 253 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 254 atomic_dec(&bebob->playback_substreams); 255 256 snd_bebob_stream_stop_duplex(bebob); 257 258 return snd_pcm_lib_free_vmalloc_buffer(substream); 259 } 260 261 static int 262 pcm_capture_prepare(struct snd_pcm_substream *substream) 263 { 264 struct snd_bebob *bebob = substream->private_data; 265 struct snd_pcm_runtime *runtime = substream->runtime; 266 int err; 267 268 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 269 if (err >= 0) 270 amdtp_stream_pcm_prepare(&bebob->tx_stream); 271 272 return err; 273 } 274 static int 275 pcm_playback_prepare(struct snd_pcm_substream *substream) 276 { 277 struct snd_bebob *bebob = substream->private_data; 278 struct snd_pcm_runtime *runtime = substream->runtime; 279 int err; 280 281 err = snd_bebob_stream_start_duplex(bebob, runtime->rate); 282 if (err >= 0) 283 amdtp_stream_pcm_prepare(&bebob->rx_stream); 284 285 return err; 286 } 287 288 static int 289 pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 290 { 291 struct snd_bebob *bebob = substream->private_data; 292 293 switch (cmd) { 294 case SNDRV_PCM_TRIGGER_START: 295 amdtp_stream_pcm_trigger(&bebob->tx_stream, substream); 296 break; 297 case SNDRV_PCM_TRIGGER_STOP: 298 amdtp_stream_pcm_trigger(&bebob->tx_stream, NULL); 299 break; 300 default: 301 return -EINVAL; 302 } 303 304 return 0; 305 } 306 static int 307 pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 308 { 309 struct snd_bebob *bebob = substream->private_data; 310 311 switch (cmd) { 312 case SNDRV_PCM_TRIGGER_START: 313 amdtp_stream_pcm_trigger(&bebob->rx_stream, substream); 314 break; 315 case SNDRV_PCM_TRIGGER_STOP: 316 amdtp_stream_pcm_trigger(&bebob->rx_stream, NULL); 317 break; 318 default: 319 return -EINVAL; 320 } 321 322 return 0; 323 } 324 325 static snd_pcm_uframes_t 326 pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 327 { 328 struct snd_bebob *bebob = sbstrm->private_data; 329 return amdtp_stream_pcm_pointer(&bebob->tx_stream); 330 } 331 static snd_pcm_uframes_t 332 pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 333 { 334 struct snd_bebob *bebob = sbstrm->private_data; 335 return amdtp_stream_pcm_pointer(&bebob->rx_stream); 336 } 337 338 static const struct snd_pcm_ops pcm_capture_ops = { 339 .open = pcm_open, 340 .close = pcm_close, 341 .ioctl = snd_pcm_lib_ioctl, 342 .hw_params = pcm_capture_hw_params, 343 .hw_free = pcm_capture_hw_free, 344 .prepare = pcm_capture_prepare, 345 .trigger = pcm_capture_trigger, 346 .pointer = pcm_capture_pointer, 347 .page = snd_pcm_lib_get_vmalloc_page, 348 }; 349 static const struct snd_pcm_ops pcm_playback_ops = { 350 .open = pcm_open, 351 .close = pcm_close, 352 .ioctl = snd_pcm_lib_ioctl, 353 .hw_params = pcm_playback_hw_params, 354 .hw_free = pcm_playback_hw_free, 355 .prepare = pcm_playback_prepare, 356 .trigger = pcm_playback_trigger, 357 .pointer = pcm_playback_pointer, 358 .page = snd_pcm_lib_get_vmalloc_page, 359 .mmap = snd_pcm_lib_mmap_vmalloc, 360 }; 361 362 int snd_bebob_create_pcm_devices(struct snd_bebob *bebob) 363 { 364 struct snd_pcm *pcm; 365 int err; 366 367 err = snd_pcm_new(bebob->card, bebob->card->driver, 0, 1, 1, &pcm); 368 if (err < 0) 369 goto end; 370 371 pcm->private_data = bebob; 372 snprintf(pcm->name, sizeof(pcm->name), 373 "%s PCM", bebob->card->shortname); 374 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops); 375 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops); 376 end: 377 return err; 378 } 379