1 /* 2 * ff-pcm.c - a part of driver for RME Fireface series 3 * 4 * Copyright (c) 2015-2017 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include "ff.h" 10 11 static inline unsigned int get_multiplier_mode_with_index(unsigned int index) 12 { 13 return ((int)index - 1) / 2; 14 } 15 16 static int hw_rule_rate(struct snd_pcm_hw_params *params, 17 struct snd_pcm_hw_rule *rule) 18 { 19 const unsigned int *pcm_channels = rule->private; 20 struct snd_interval *r = 21 hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 22 const struct snd_interval *c = 23 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); 24 struct snd_interval t = { 25 .min = UINT_MAX, .max = 0, .integer = 1 26 }; 27 unsigned int i, mode; 28 29 for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) { 30 mode = get_multiplier_mode_with_index(i); 31 if (!snd_interval_test(c, pcm_channels[mode])) 32 continue; 33 34 t.min = min(t.min, amdtp_rate_table[i]); 35 t.max = max(t.max, amdtp_rate_table[i]); 36 } 37 38 return snd_interval_refine(r, &t); 39 } 40 41 static int hw_rule_channels(struct snd_pcm_hw_params *params, 42 struct snd_pcm_hw_rule *rule) 43 { 44 const unsigned int *pcm_channels = rule->private; 45 struct snd_interval *c = 46 hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 47 const struct snd_interval *r = 48 hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE); 49 struct snd_interval t = { 50 .min = UINT_MAX, .max = 0, .integer = 1 51 }; 52 unsigned int i, mode; 53 54 for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) { 55 mode = get_multiplier_mode_with_index(i); 56 if (!snd_interval_test(r, amdtp_rate_table[i])) 57 continue; 58 59 t.min = min(t.min, pcm_channels[mode]); 60 t.max = max(t.max, pcm_channels[mode]); 61 } 62 63 return snd_interval_refine(c, &t); 64 } 65 66 static void limit_channels_and_rates(struct snd_pcm_hardware *hw, 67 const unsigned int *pcm_channels) 68 { 69 unsigned int mode; 70 unsigned int rate, channels; 71 int i; 72 73 hw->channels_min = UINT_MAX; 74 hw->channels_max = 0; 75 hw->rate_min = UINT_MAX; 76 hw->rate_max = 0; 77 78 for (i = 0; i < ARRAY_SIZE(amdtp_rate_table); i++) { 79 mode = get_multiplier_mode_with_index(i); 80 81 channels = pcm_channels[mode]; 82 if (pcm_channels[mode] == 0) 83 continue; 84 hw->channels_min = min(hw->channels_min, channels); 85 hw->channels_max = max(hw->channels_max, channels); 86 87 rate = amdtp_rate_table[i]; 88 hw->rates |= snd_pcm_rate_to_rate_bit(rate); 89 hw->rate_min = min(hw->rate_min, rate); 90 hw->rate_max = max(hw->rate_max, rate); 91 } 92 } 93 94 static void limit_period_and_buffer(struct snd_pcm_hardware *hw) 95 { 96 hw->periods_min = 2; /* SNDRV_PCM_INFO_BATCH */ 97 hw->periods_max = UINT_MAX; 98 99 hw->period_bytes_min = 4 * hw->channels_max; /* bytes for a frame */ 100 101 /* Just to prevent from allocating much pages. */ 102 hw->period_bytes_max = hw->period_bytes_min * 2048; 103 hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min; 104 } 105 106 static int pcm_init_hw_params(struct snd_ff *ff, 107 struct snd_pcm_substream *substream) 108 { 109 struct snd_pcm_runtime *runtime = substream->runtime; 110 struct amdtp_stream *s; 111 const unsigned int *pcm_channels; 112 int err; 113 114 runtime->hw.info = SNDRV_PCM_INFO_BATCH | 115 SNDRV_PCM_INFO_BLOCK_TRANSFER | 116 SNDRV_PCM_INFO_INTERLEAVED | 117 SNDRV_PCM_INFO_JOINT_DUPLEX | 118 SNDRV_PCM_INFO_MMAP | 119 SNDRV_PCM_INFO_MMAP_VALID; 120 121 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { 122 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32; 123 s = &ff->tx_stream; 124 pcm_channels = ff->spec->pcm_capture_channels; 125 } else { 126 runtime->hw.formats = SNDRV_PCM_FMTBIT_S32; 127 s = &ff->rx_stream; 128 pcm_channels = ff->spec->pcm_playback_channels; 129 } 130 131 /* limit rates */ 132 limit_channels_and_rates(&runtime->hw, pcm_channels); 133 limit_period_and_buffer(&runtime->hw); 134 135 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 136 hw_rule_channels, (void *)pcm_channels, 137 SNDRV_PCM_HW_PARAM_RATE, -1); 138 if (err < 0) 139 return err; 140 141 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 142 hw_rule_rate, (void *)pcm_channels, 143 SNDRV_PCM_HW_PARAM_CHANNELS, -1); 144 if (err < 0) 145 return err; 146 147 return amdtp_ff_add_pcm_hw_constraints(s, runtime); 148 } 149 150 static int pcm_open(struct snd_pcm_substream *substream) 151 { 152 struct snd_ff *ff = substream->private_data; 153 unsigned int rate; 154 enum snd_ff_clock_src src; 155 int i, err; 156 157 err = snd_ff_stream_lock_try(ff); 158 if (err < 0) 159 return err; 160 161 err = pcm_init_hw_params(ff, substream); 162 if (err < 0) { 163 snd_ff_stream_lock_release(ff); 164 return err; 165 } 166 167 err = ff->spec->protocol->get_clock(ff, &rate, &src); 168 if (err < 0) { 169 snd_ff_stream_lock_release(ff); 170 return err; 171 } 172 173 if (src != SND_FF_CLOCK_SRC_INTERNAL) { 174 for (i = 0; i < CIP_SFC_COUNT; ++i) { 175 if (amdtp_rate_table[i] == rate) 176 break; 177 } 178 /* 179 * The unit is configured at sampling frequency which packet 180 * streaming engine can't support. 181 */ 182 if (i >= CIP_SFC_COUNT) { 183 snd_ff_stream_lock_release(ff); 184 return -EIO; 185 } 186 187 substream->runtime->hw.rate_min = rate; 188 substream->runtime->hw.rate_max = rate; 189 } else { 190 if (amdtp_stream_pcm_running(&ff->rx_stream) || 191 amdtp_stream_pcm_running(&ff->tx_stream)) { 192 rate = amdtp_rate_table[ff->rx_stream.sfc]; 193 substream->runtime->hw.rate_min = rate; 194 substream->runtime->hw.rate_max = rate; 195 } 196 } 197 198 snd_pcm_set_sync(substream); 199 200 return 0; 201 } 202 203 static int pcm_close(struct snd_pcm_substream *substream) 204 { 205 struct snd_ff *ff = substream->private_data; 206 207 snd_ff_stream_lock_release(ff); 208 209 return 0; 210 } 211 212 static int pcm_capture_hw_params(struct snd_pcm_substream *substream, 213 struct snd_pcm_hw_params *hw_params) 214 { 215 struct snd_ff *ff = 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(&ff->mutex); 225 ff->substreams_counter++; 226 mutex_unlock(&ff->mutex); 227 } 228 229 return 0; 230 } 231 232 static int pcm_playback_hw_params(struct snd_pcm_substream *substream, 233 struct snd_pcm_hw_params *hw_params) 234 { 235 struct snd_ff *ff = 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(&ff->mutex); 245 ff->substreams_counter++; 246 mutex_unlock(&ff->mutex); 247 } 248 249 return 0; 250 } 251 252 static int pcm_capture_hw_free(struct snd_pcm_substream *substream) 253 { 254 struct snd_ff *ff = substream->private_data; 255 256 mutex_lock(&ff->mutex); 257 258 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 259 ff->substreams_counter--; 260 261 snd_ff_stream_stop_duplex(ff); 262 263 mutex_unlock(&ff->mutex); 264 265 return snd_pcm_lib_free_vmalloc_buffer(substream); 266 } 267 268 static int pcm_playback_hw_free(struct snd_pcm_substream *substream) 269 { 270 struct snd_ff *ff = substream->private_data; 271 272 mutex_lock(&ff->mutex); 273 274 if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) 275 ff->substreams_counter--; 276 277 snd_ff_stream_stop_duplex(ff); 278 279 mutex_unlock(&ff->mutex); 280 281 return snd_pcm_lib_free_vmalloc_buffer(substream); 282 } 283 284 static int pcm_capture_prepare(struct snd_pcm_substream *substream) 285 { 286 struct snd_ff *ff = substream->private_data; 287 struct snd_pcm_runtime *runtime = substream->runtime; 288 int err; 289 290 mutex_lock(&ff->mutex); 291 292 err = snd_ff_stream_start_duplex(ff, runtime->rate); 293 if (err >= 0) 294 amdtp_stream_pcm_prepare(&ff->tx_stream); 295 296 mutex_unlock(&ff->mutex); 297 298 return err; 299 } 300 301 static int pcm_playback_prepare(struct snd_pcm_substream *substream) 302 { 303 struct snd_ff *ff = substream->private_data; 304 struct snd_pcm_runtime *runtime = substream->runtime; 305 int err; 306 307 mutex_lock(&ff->mutex); 308 309 err = snd_ff_stream_start_duplex(ff, runtime->rate); 310 if (err >= 0) 311 amdtp_stream_pcm_prepare(&ff->rx_stream); 312 313 mutex_unlock(&ff->mutex); 314 315 return err; 316 } 317 318 static int pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd) 319 { 320 struct snd_ff *ff = substream->private_data; 321 322 switch (cmd) { 323 case SNDRV_PCM_TRIGGER_START: 324 amdtp_stream_pcm_trigger(&ff->tx_stream, substream); 325 break; 326 case SNDRV_PCM_TRIGGER_STOP: 327 amdtp_stream_pcm_trigger(&ff->tx_stream, NULL); 328 break; 329 default: 330 return -EINVAL; 331 } 332 333 return 0; 334 } 335 336 static int pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd) 337 { 338 struct snd_ff *ff = substream->private_data; 339 340 switch (cmd) { 341 case SNDRV_PCM_TRIGGER_START: 342 amdtp_stream_pcm_trigger(&ff->rx_stream, substream); 343 break; 344 case SNDRV_PCM_TRIGGER_STOP: 345 amdtp_stream_pcm_trigger(&ff->rx_stream, NULL); 346 break; 347 default: 348 return -EINVAL; 349 } 350 351 return 0; 352 } 353 354 static snd_pcm_uframes_t pcm_capture_pointer(struct snd_pcm_substream *sbstrm) 355 { 356 struct snd_ff *ff = sbstrm->private_data; 357 358 return amdtp_stream_pcm_pointer(&ff->tx_stream); 359 } 360 361 static snd_pcm_uframes_t pcm_playback_pointer(struct snd_pcm_substream *sbstrm) 362 { 363 struct snd_ff *ff = sbstrm->private_data; 364 365 return amdtp_stream_pcm_pointer(&ff->rx_stream); 366 } 367 368 static struct snd_pcm_ops pcm_capture_ops = { 369 .open = pcm_open, 370 .close = pcm_close, 371 .ioctl = snd_pcm_lib_ioctl, 372 .hw_params = pcm_capture_hw_params, 373 .hw_free = pcm_capture_hw_free, 374 .prepare = pcm_capture_prepare, 375 .trigger = pcm_capture_trigger, 376 .pointer = pcm_capture_pointer, 377 .page = snd_pcm_lib_get_vmalloc_page, 378 }; 379 380 static struct snd_pcm_ops pcm_playback_ops = { 381 .open = pcm_open, 382 .close = pcm_close, 383 .ioctl = snd_pcm_lib_ioctl, 384 .hw_params = pcm_playback_hw_params, 385 .hw_free = pcm_playback_hw_free, 386 .prepare = pcm_playback_prepare, 387 .trigger = pcm_playback_trigger, 388 .pointer = pcm_playback_pointer, 389 .page = snd_pcm_lib_get_vmalloc_page, 390 .mmap = snd_pcm_lib_mmap_vmalloc, 391 }; 392 393 int snd_ff_create_pcm_devices(struct snd_ff *ff) 394 { 395 struct snd_pcm *pcm; 396 int err; 397 398 err = snd_pcm_new(ff->card, ff->card->driver, 0, 1, 1, &pcm); 399 if (err < 0) 400 return err; 401 402 pcm->private_data = ff; 403 snprintf(pcm->name, sizeof(pcm->name), 404 "%s PCM", ff->card->shortname); 405 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pcm_playback_ops); 406 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pcm_capture_ops); 407 408 return 0; 409 } 410