1 /* 2 * Auich BeOS Driver for Intel Southbridge audio 3 * 4 * Copyright (c) 2003, Jerome Duval (jerome.duval@free.fr) 5 * 6 * Original code : BeOS Driver for Intel ICH AC'97 Link interface 7 * Copyright (c) 2002, Marcus Overhagen <marcus@overhagen.de> 8 * 9 * All rights reserved. 10 * Redistribution and use in source and binary forms, with or without modification, 11 * are permitted provided that the following conditions are met: 12 * 13 * - Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * - Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 28 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 */ 31 32 #include <driver_settings.h> 33 #include <OS.h> 34 #include <MediaDefs.h> 35 #include <string.h> 36 #include <strings.h> 37 38 #include <kernel.h> 39 40 #include "hmulti_audio.h" 41 #include "multi.h" 42 #include "ac97.h" 43 44 //#define DEBUG 1 45 46 #include "debug.h" 47 #include "auich.h" 48 #include "util.h" 49 #include "io.h" 50 51 52 static void 53 auich_ac97_get_mix(void *card, const void *cookie, int32 type, float *values) { 54 auich_dev *dev = (auich_dev*)card; 55 ac97_source_info *info = (ac97_source_info *)cookie; 56 uint16 value, mask; 57 float gain; 58 59 switch(type) { 60 case B_MIX_GAIN: 61 value = auich_codec_read(&dev->config, info->reg); 62 //PRINT(("B_MIX_GAIN value : %u\n", value)); 63 if (info->type & B_MIX_STEREO) { 64 mask = ((1 << (info->bits + 1)) - 1) << 8; 65 gain = ((value & mask) >> 8) * info->granularity; 66 if (info->polarity == 1) 67 values[0] = info->max_gain - gain; 68 else 69 values[0] = gain - info->min_gain; 70 71 mask = ((1 << (info->bits + 1)) - 1); 72 gain = (value & mask) * info->granularity; 73 if (info->polarity == 1) 74 values[1] = info->max_gain - gain; 75 else 76 values[1] = gain - info->min_gain; 77 } else { 78 mask = ((1 << (info->bits + 1)) - 1); 79 gain = (value & mask) * info->granularity; 80 if (info->polarity == 1) 81 values[0] = info->max_gain - gain; 82 else 83 values[0] = gain - info->min_gain; 84 } 85 break; 86 case B_MIX_MUTE: 87 mask = ((1 << 1) - 1) << 15; 88 value = auich_codec_read(&dev->config, info->reg); 89 //PRINT(("B_MIX_MUTE value : %u\n", value)); 90 value &= mask; 91 values[0] = ((value >> 15) == 1) ? 1.0 : 0.0; 92 break; 93 case B_MIX_MICBOOST: 94 mask = ((1 << 1) - 1) << 6; 95 value = auich_codec_read(&dev->config, info->reg); 96 //PRINT(("B_MIX_MICBOOST value : %u\n", value)); 97 value &= mask; 98 values[0] = ((value >> 6) == 1) ? 1.0 : 0.0; 99 break; 100 case B_MIX_MUX: 101 mask = ((1 << 3) - 1); 102 value = auich_codec_read(&dev->config, AC97_RECORD_SELECT); 103 value &= mask; 104 //PRINT(("B_MIX_MUX value : %u\n", value)); 105 values[0] = (float)value; 106 break; 107 } 108 } 109 110 111 static void 112 auich_ac97_set_mix(void *card, const void *cookie, int32 type, float *values) { 113 auich_dev *dev = (auich_dev*)card; 114 ac97_source_info *info = (ac97_source_info *)cookie; 115 uint16 value, mask; 116 float gain; 117 118 switch(type) { 119 case B_MIX_GAIN: 120 value = auich_codec_read(&dev->config, info->reg); 121 if (info->type & B_MIX_STEREO) { 122 mask = ((1 << (info->bits + 1)) - 1) << 8; 123 value &= ~mask; 124 125 if (info->polarity == 1) 126 gain = info->max_gain - values[0]; 127 else 128 gain = values[0] - info->min_gain; 129 value |= ((uint16)(gain / info->granularity) << 8) & mask; 130 131 mask = ((1 << (info->bits + 1)) - 1); 132 value &= ~mask; 133 if (info->polarity == 1) 134 gain = info->max_gain - values[1]; 135 else 136 gain = values[1] - info->min_gain; 137 value |= ((uint16)(gain / info->granularity)) & mask; 138 } else { 139 mask = ((1 << (info->bits + 1)) - 1); 140 value &= ~mask; 141 if (info->polarity == 1) 142 gain = info->max_gain - values[0]; 143 else 144 gain = values[0] - info->min_gain; 145 value |= ((uint16)(gain / info->granularity)) & mask; 146 } 147 //PRINT(("B_MIX_GAIN value : %u\n", value)); 148 auich_codec_write(&dev->config, info->reg, value); 149 break; 150 case B_MIX_MUTE: 151 mask = ((1 << 1) - 1) << 15; 152 value = auich_codec_read(&dev->config, info->reg); 153 value &= ~mask; 154 value |= ((values[0] == 1.0 ? 1 : 0 ) << 15 & mask); 155 if (info->reg == AC97_SURR_VOLUME) { 156 // there is a independent mute for each channel 157 mask = ((1 << 1) - 1) << 7; 158 value &= ~mask; 159 value |= ((values[0] == 1.0 ? 1 : 0 ) << 7 & mask); 160 } 161 //PRINT(("B_MIX_MUTE value : %u\n", value)); 162 auich_codec_write(&dev->config, info->reg, value); 163 break; 164 case B_MIX_MICBOOST: 165 mask = ((1 << 1) - 1) << 6; 166 value = auich_codec_read(&dev->config, info->reg); 167 value &= ~mask; 168 value |= ((values[0] == 1.0 ? 1 : 0 ) << 6 & mask); 169 //PRINT(("B_MIX_MICBOOST value : %u\n", value)); 170 auich_codec_write(&dev->config, info->reg, value); 171 break; 172 case B_MIX_MUX: 173 mask = ((1 << 3) - 1); 174 value = ((int32)values[0]) & mask; 175 value = value | (value << 8); 176 //PRINT(("B_MIX_MUX value : %u\n", value)); 177 auich_codec_write(&dev->config, AC97_RECORD_SELECT, value); 178 break; 179 } 180 181 } 182 183 184 static int32 185 auich_create_group_control(multi_dev *multi, int32 *index, int32 parent, 186 int32 string, const char* name) { 187 int32 i = *index; 188 (*index)++; 189 multi->controls[i].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + i; 190 multi->controls[i].mix_control.parent = parent; 191 multi->controls[i].mix_control.flags = B_MULTI_MIX_GROUP; 192 multi->controls[i].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 193 multi->controls[i].mix_control.string = string; 194 if (name) 195 strcpy(multi->controls[i].mix_control.name, name); 196 197 return multi->controls[i].mix_control.id; 198 } 199 200 201 static status_t 202 auich_create_controls_list(multi_dev *multi) 203 { 204 uint32 i = 0, index = 0, count, id, parent, parent2, parent3; 205 const ac97_source_info *info; 206 207 /* AC97 Mixer */ 208 parent = auich_create_group_control(multi, &index, 0, 0, "AC97 mixer"); 209 210 count = source_info_size; 211 //Note that we ignore first item in source_info 212 //It's for recording, but do match this with ac97.c's source_info 213 for (i = 1; i < count ; i++) { 214 info = &source_info[i]; 215 PRINT(("name : %s\n", info->name)); 216 217 parent2 = auich_create_group_control(multi, &index, parent, 0, info->name); 218 219 if (info->type & B_MIX_GAIN) { 220 if (info->type & B_MIX_MUTE) { 221 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 222 multi->controls[index].mix_control.flags = B_MULTI_MIX_ENABLE; 223 multi->controls[index].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 224 multi->controls[index].mix_control.parent = parent2; 225 multi->controls[index].mix_control.string = S_MUTE; 226 multi->controls[index].cookie = info; 227 multi->controls[index].type = B_MIX_MUTE; 228 multi->controls[index].get = &auich_ac97_get_mix; 229 multi->controls[index].set = &auich_ac97_set_mix; 230 index++; 231 } 232 233 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 234 multi->controls[index].mix_control.flags = B_MULTI_MIX_GAIN; 235 multi->controls[index].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 236 multi->controls[index].mix_control.parent = parent2; 237 strcpy(multi->controls[index].mix_control.name, info->name); 238 multi->controls[index].mix_control.u.gain.min_gain = info->min_gain; 239 multi->controls[index].mix_control.u.gain.max_gain = info->max_gain; 240 multi->controls[index].mix_control.u.gain.granularity = info->granularity; 241 multi->controls[index].cookie = info; 242 multi->controls[index].type = B_MIX_GAIN; 243 multi->controls[index].get = &auich_ac97_get_mix; 244 multi->controls[index].set = &auich_ac97_set_mix; 245 id = multi->controls[index].mix_control.id; 246 index++; 247 248 if (info->type & B_MIX_STEREO) { 249 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 250 multi->controls[index].mix_control.flags = B_MULTI_MIX_GAIN; 251 multi->controls[index].mix_control.master = id; 252 multi->controls[index].mix_control.parent = parent2; 253 strcpy(multi->controls[index].mix_control.name, info->name); 254 multi->controls[index].mix_control.u.gain.min_gain = info->min_gain; 255 multi->controls[index].mix_control.u.gain.max_gain = info->max_gain; 256 multi->controls[index].mix_control.u.gain.granularity = info->granularity; 257 multi->controls[index].cookie = info; 258 multi->controls[index].type = B_MIX_GAIN; 259 multi->controls[index].get = &auich_ac97_get_mix; 260 multi->controls[index].set = &auich_ac97_set_mix; 261 index++; 262 } 263 264 if (info->type & B_MIX_MICBOOST) { 265 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 266 multi->controls[index].mix_control.flags = B_MULTI_MIX_ENABLE; 267 multi->controls[index].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 268 multi->controls[index].mix_control.parent = parent2; 269 strcpy(multi->controls[index].mix_control.name, "+20 dB"); 270 multi->controls[index].cookie = info; 271 multi->controls[index].type = B_MIX_MICBOOST; 272 multi->controls[index].get = &auich_ac97_get_mix; 273 multi->controls[index].set = &auich_ac97_set_mix; 274 index++; 275 } 276 } 277 } 278 279 /* AC97 Record */ 280 parent = auich_create_group_control(multi, &index, 0, 0, "Recording"); 281 282 info = &source_info[0]; 283 PRINT(("name : %s\n", info->name)); 284 285 parent2 = auich_create_group_control(multi, &index, parent, 0, info->name); 286 287 if (info->type & B_MIX_GAIN) { 288 if (info->type & B_MIX_MUTE) { 289 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 290 multi->controls[index].mix_control.flags = B_MULTI_MIX_ENABLE; 291 multi->controls[index].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 292 multi->controls[index].mix_control.parent = parent2; 293 multi->controls[index].mix_control.string = S_MUTE; 294 multi->controls[index].cookie = info; 295 multi->controls[index].type = B_MIX_MUTE; 296 multi->controls[index].get = &auich_ac97_get_mix; 297 multi->controls[index].set = &auich_ac97_set_mix; 298 index++; 299 } 300 301 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 302 multi->controls[index].mix_control.flags = B_MULTI_MIX_GAIN; 303 multi->controls[index].mix_control.master = EMU_MULTI_CONTROL_MASTERID; 304 multi->controls[index].mix_control.parent = parent2; 305 strcpy(multi->controls[index].mix_control.name, info->name); 306 multi->controls[index].mix_control.u.gain.min_gain = info->min_gain; 307 multi->controls[index].mix_control.u.gain.max_gain = info->max_gain; 308 multi->controls[index].mix_control.u.gain.granularity = info->granularity; 309 multi->controls[index].cookie = info; 310 multi->controls[index].type = B_MIX_GAIN; 311 multi->controls[index].get = &auich_ac97_get_mix; 312 multi->controls[index].set = &auich_ac97_set_mix; 313 id = multi->controls[index].mix_control.id; 314 index++; 315 316 if (info->type & B_MIX_STEREO) { 317 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 318 multi->controls[index].mix_control.flags = B_MULTI_MIX_GAIN; 319 multi->controls[index].mix_control.master = id; 320 multi->controls[index].mix_control.parent = parent2; 321 strcpy(multi->controls[index].mix_control.name, info->name); 322 multi->controls[index].mix_control.u.gain.min_gain = info->min_gain; 323 multi->controls[index].mix_control.u.gain.max_gain = info->max_gain; 324 multi->controls[index].mix_control.u.gain.granularity = info->granularity; 325 multi->controls[index].cookie = info; 326 multi->controls[index].type = B_MIX_GAIN; 327 multi->controls[index].get = &auich_ac97_get_mix; 328 multi->controls[index].set = &auich_ac97_set_mix; 329 index++; 330 } 331 332 if (info->type & B_MIX_RECORDMUX) { 333 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 334 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX; 335 multi->controls[index].mix_control.parent = parent2; 336 strcpy(multi->controls[index].mix_control.name, "Record mux"); 337 multi->controls[index].cookie = info; 338 multi->controls[index].type = B_MIX_MUX; 339 multi->controls[index].get = &auich_ac97_get_mix; 340 multi->controls[index].set = &auich_ac97_set_mix; 341 parent3 = multi->controls[index].mix_control.id; 342 index++; 343 344 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 345 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 346 multi->controls[index].mix_control.parent = parent3; 347 multi->controls[index].mix_control.string = S_MIC; 348 index++; 349 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 350 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 351 multi->controls[index].mix_control.parent = parent3; 352 strcpy(multi->controls[index].mix_control.name, "CD in"); 353 index++; 354 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 355 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 356 multi->controls[index].mix_control.parent = parent3; 357 strcpy(multi->controls[index].mix_control.name, "Video in"); 358 index++; 359 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 360 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 361 multi->controls[index].mix_control.parent = parent3; 362 strcpy(multi->controls[index].mix_control.name, "Aux in"); 363 index++; 364 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 365 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 366 multi->controls[index].mix_control.parent = parent3; 367 strcpy(multi->controls[index].mix_control.name, "Line in"); 368 index++; 369 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 370 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 371 multi->controls[index].mix_control.parent = parent3; 372 multi->controls[index].mix_control.string = S_STEREO_MIX; 373 index++; 374 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 375 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 376 multi->controls[index].mix_control.parent = parent3; 377 multi->controls[index].mix_control.string = S_MONO_MIX; 378 index++; 379 multi->controls[index].mix_control.id = EMU_MULTI_CONTROL_FIRSTID + index; 380 multi->controls[index].mix_control.flags = B_MULTI_MIX_MUX_VALUE; 381 multi->controls[index].mix_control.parent = parent3; 382 strcpy(multi->controls[index].mix_control.name, "TAD"); 383 index++; 384 } 385 } 386 387 multi->control_count = index; 388 PRINT(("multi->control_count %lu\n", multi->control_count)); 389 return B_OK; 390 } 391 392 393 static status_t 394 auich_get_mix(auich_dev *card, multi_mix_value_info * mmvi) 395 { 396 int32 i, id; 397 multi_mixer_control *control = NULL; 398 for (i = 0; i < mmvi->item_count; i++) { 399 id = mmvi->values[i].id - EMU_MULTI_CONTROL_FIRSTID; 400 if (id < 0 || id >= card->multi.control_count) { 401 PRINT(("auich_get_mix : invalid control id requested : %li\n", id)); 402 continue; 403 } 404 control = &card->multi.controls[id]; 405 406 if (control->mix_control.flags & B_MULTI_MIX_GAIN) { 407 if (control->get) { 408 float values[2]; 409 control->get(card, control->cookie, control->type, values); 410 if (control->mix_control.master == EMU_MULTI_CONTROL_MASTERID) 411 mmvi->values[i].u.gain = values[0]; 412 else 413 mmvi->values[i].u.gain = values[1]; 414 } 415 } 416 417 if (control->mix_control.flags & B_MULTI_MIX_ENABLE && control->get) { 418 float values[1]; 419 control->get(card, control->cookie, control->type, values); 420 mmvi->values[i].u.enable = (values[0] == 1.0); 421 } 422 423 if (control->mix_control.flags & B_MULTI_MIX_MUX && control->get) { 424 float values[1]; 425 control->get(card, control->cookie, control->type, values); 426 mmvi->values[i].u.mux = (int32)values[0]; 427 } 428 } 429 return B_OK; 430 } 431 432 433 static status_t 434 auich_set_mix(auich_dev *card, multi_mix_value_info * mmvi) 435 { 436 int32 i, id; 437 multi_mixer_control *control = NULL; 438 for (i = 0; i < mmvi->item_count; i++) { 439 id = mmvi->values[i].id - EMU_MULTI_CONTROL_FIRSTID; 440 if (id < 0 || id >= card->multi.control_count) { 441 PRINT(("auich_set_mix : invalid control id requested : %li\n", id)); 442 continue; 443 } 444 control = &card->multi.controls[id]; 445 446 if (control->mix_control.flags & B_MULTI_MIX_GAIN) { 447 multi_mixer_control *control2 = NULL; 448 if (i+1<mmvi->item_count) { 449 id = mmvi->values[i + 1].id - EMU_MULTI_CONTROL_FIRSTID; 450 if (id < 0 || id >= card->multi.control_count) { 451 PRINT(("auich_set_mix : invalid control id requested : %li\n", id)); 452 } else { 453 control2 = &card->multi.controls[id]; 454 if (control2->mix_control.master != control->mix_control.id) 455 control2 = NULL; 456 } 457 } 458 459 if (control->set) { 460 float values[2]; 461 values[0] = 0.0; 462 values[1] = 0.0; 463 464 if (control->mix_control.master == EMU_MULTI_CONTROL_MASTERID) 465 values[0] = mmvi->values[i].u.gain; 466 else 467 values[1] = mmvi->values[i].u.gain; 468 469 if (control2 && control2->mix_control.master != EMU_MULTI_CONTROL_MASTERID) 470 values[1] = mmvi->values[i+1].u.gain; 471 472 control->set(card, control->cookie, control->type, values); 473 } 474 475 if (control2) 476 i++; 477 } 478 479 if (control->mix_control.flags & B_MULTI_MIX_ENABLE && control->set) { 480 float values[1]; 481 482 values[0] = mmvi->values[i].u.enable ? 1.0 : 0.0; 483 control->set(card, control->cookie, control->type, values); 484 } 485 486 if (control->mix_control.flags & B_MULTI_MIX_MUX && control->set) { 487 float values[1]; 488 489 values[0] = (float)mmvi->values[i].u.mux; 490 control->set(card, control->cookie, control->type, values); 491 } 492 } 493 return B_OK; 494 } 495 496 497 static status_t 498 auich_list_mix_controls(auich_dev *card, multi_mix_control_info * mmci) 499 { 500 multi_mix_control *mmc; 501 int32 i; 502 503 mmc = mmci->controls; 504 if (mmci->control_count < 24) 505 return B_ERROR; 506 507 if (auich_create_controls_list(&card->multi) < B_OK) 508 return B_ERROR; 509 for (i = 0; i < card->multi.control_count; i++) { 510 mmc[i] = card->multi.controls[i].mix_control; 511 } 512 513 mmci->control_count = card->multi.control_count; 514 return B_OK; 515 } 516 517 518 static status_t 519 auich_list_mix_connections(auich_dev *card, multi_mix_connection_info * data) 520 { 521 return B_ERROR; 522 } 523 524 525 static status_t 526 auich_list_mix_channels(auich_dev *card, multi_mix_channel_info *data) 527 { 528 return B_ERROR; 529 } 530 531 /*multi_channel_info chans[] = { 532 { 0, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 533 { 1, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 534 { 2, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 535 { 3, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 536 { 4, B_MULTI_INPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 537 { 5, B_MULTI_INPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 538 { 6, B_MULTI_INPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 539 { 7, B_MULTI_INPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 540 { 8, B_MULTI_OUTPUT_BUS, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 541 { 9, B_MULTI_OUTPUT_BUS, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 542 { 10, B_MULTI_INPUT_BUS, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 543 { 11, B_MULTI_INPUT_BUS, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 544 };*/ 545 546 /*multi_channel_info chans[] = { 547 { 0, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 548 { 1, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 549 { 2, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_SURROUND_BUS, 0 }, 550 { 3, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_SURROUND_BUS, 0 }, 551 { 4, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_REARLEFT | B_CHANNEL_SURROUND_BUS, 0 }, 552 { 5, B_MULTI_OUTPUT_CHANNEL, B_CHANNEL_REARRIGHT | B_CHANNEL_SURROUND_BUS, 0 }, 553 { 6, B_MULTI_INPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 554 { 7, B_MULTI_INPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 555 { 8, B_MULTI_INPUT_CHANNEL, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, 0 }, 556 { 9, B_MULTI_INPUT_CHANNEL, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, 0 }, 557 { 10, B_MULTI_OUTPUT_BUS, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 558 { 11, B_MULTI_OUTPUT_BUS, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 559 { 12, B_MULTI_INPUT_BUS, B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 560 { 13, B_MULTI_INPUT_BUS, B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS, B_CHANNEL_MINI_JACK_STEREO }, 561 };*/ 562 563 564 static void 565 auich_create_channels_list(multi_dev *multi) 566 { 567 auich_stream *stream; 568 uint32 index, i, mode, designations; 569 multi_channel_info *chans; 570 uint32 chan_designations[] = { 571 B_CHANNEL_LEFT, 572 B_CHANNEL_RIGHT, 573 B_CHANNEL_REARLEFT, 574 B_CHANNEL_REARRIGHT, 575 B_CHANNEL_CENTER, 576 B_CHANNEL_SUB 577 }; 578 579 chans = multi->chans; 580 index = 0; 581 582 for (mode=AUICH_USE_PLAY; mode!=-1; 583 mode = (mode == AUICH_USE_PLAY) ? AUICH_USE_RECORD : -1) { 584 LIST_FOREACH(stream, &((auich_dev*)multi->card)->streams, next) { 585 if ((stream->use & mode) == 0) 586 continue; 587 588 if (stream->channels == 2) 589 designations = B_CHANNEL_STEREO_BUS; 590 else 591 designations = B_CHANNEL_SURROUND_BUS; 592 593 for (i = 0; i < stream->channels; i++) { 594 chans[index].channel_id = index; 595 chans[index].kind = (mode == AUICH_USE_PLAY) ? B_MULTI_OUTPUT_CHANNEL : B_MULTI_INPUT_CHANNEL; 596 chans[index].designations = designations | chan_designations[i]; 597 chans[index].connectors = 0; 598 index++; 599 } 600 } 601 602 if (mode==AUICH_USE_PLAY) { 603 multi->output_channel_count = index; 604 } else { 605 multi->input_channel_count = index - multi->output_channel_count; 606 } 607 } 608 609 chans[index].channel_id = index; 610 chans[index].kind = B_MULTI_OUTPUT_BUS; 611 chans[index].designations = B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS; 612 chans[index].connectors = B_CHANNEL_MINI_JACK_STEREO; 613 index++; 614 615 chans[index].channel_id = index; 616 chans[index].kind = B_MULTI_OUTPUT_BUS; 617 chans[index].designations = B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS; 618 chans[index].connectors = B_CHANNEL_MINI_JACK_STEREO; 619 index++; 620 621 multi->output_bus_channel_count = index - multi->output_channel_count 622 - multi->input_channel_count; 623 624 chans[index].channel_id = index; 625 chans[index].kind = B_MULTI_INPUT_BUS; 626 chans[index].designations = B_CHANNEL_LEFT | B_CHANNEL_STEREO_BUS; 627 chans[index].connectors = B_CHANNEL_MINI_JACK_STEREO; 628 index++; 629 630 chans[index].channel_id = index; 631 chans[index].kind = B_MULTI_INPUT_BUS; 632 chans[index].designations = B_CHANNEL_RIGHT | B_CHANNEL_STEREO_BUS; 633 chans[index].connectors = B_CHANNEL_MINI_JACK_STEREO; 634 index++; 635 636 multi->input_bus_channel_count = index - multi->output_channel_count 637 - multi->input_channel_count - multi->output_bus_channel_count; 638 639 multi->aux_bus_channel_count = 0; 640 } 641 642 643 static status_t 644 auich_get_description(auich_dev *card, multi_description *data) 645 { 646 uint32 size; 647 648 data->interface_version = B_CURRENT_INTERFACE_VERSION; 649 data->interface_minimum = B_CURRENT_INTERFACE_VERSION; 650 651 switch(card->info.vendor_id) { 652 case INTEL_VENDOR_ID: 653 strncpy(data->friendly_name, FRIENDLY_NAME_ICH, 32); 654 break; 655 case SIS_VENDOR_ID: 656 strncpy(data->friendly_name, FRIENDLY_NAME_SIS, 32); 657 break; 658 case NVIDIA_VENDOR_ID: 659 strncpy(data->friendly_name, FRIENDLY_NAME_NVIDIA, 32); 660 break; 661 case AMD_VENDOR_ID: 662 strncpy(data->friendly_name, FRIENDLY_NAME_AMD, 32); 663 break; 664 } 665 666 strcpy(data->vendor_info, AUTHOR); 667 668 /*data->output_channel_count = 6; 669 data->input_channel_count = 4; 670 data->output_bus_channel_count = 2; 671 data->input_bus_channel_count = 2; 672 data->aux_bus_channel_count = 0;*/ 673 674 data->output_channel_count = card->multi.output_channel_count; 675 data->input_channel_count = card->multi.input_channel_count; 676 data->output_bus_channel_count = card->multi.output_bus_channel_count; 677 data->input_bus_channel_count = card->multi.input_bus_channel_count; 678 data->aux_bus_channel_count = card->multi.aux_bus_channel_count; 679 680 size = card->multi.output_channel_count + card->multi.input_channel_count 681 + card->multi.output_bus_channel_count + card->multi.input_bus_channel_count 682 + card->multi.aux_bus_channel_count; 683 684 // for each channel, starting with the first output channel, 685 // then the second, third..., followed by the first input 686 // channel, second, third, ..., followed by output bus 687 // channels and input bus channels and finally auxillary channels, 688 689 LOG(("request_channel_count = %d\n",data->request_channel_count)); 690 if (data->request_channel_count >= size) { 691 LOG(("copying data\n")); 692 memcpy(data->channels, card->multi.chans, size * sizeof(card->multi.chans[0])); 693 } 694 695 switch (current_settings.sample_rate) { 696 case 48000: data->output_rates = data->input_rates = B_SR_48000; break; 697 case 44100: data->output_rates = data->input_rates = B_SR_44100; break; 698 } 699 data->min_cvsr_rate = 0; 700 data->max_cvsr_rate = 48000; 701 702 data->output_formats = B_FMT_16BIT; 703 data->input_formats = B_FMT_16BIT; 704 data->lock_sources = B_MULTI_LOCK_INTERNAL; 705 data->timecode_sources = 0; 706 data->interface_flags = B_MULTI_INTERFACE_PLAYBACK | B_MULTI_INTERFACE_RECORD; 707 data->start_latency = 3000; 708 709 strcpy(data->control_panel,""); 710 711 return B_OK; 712 } 713 714 715 static status_t 716 auich_get_enabled_channels(auich_dev *card, multi_channel_enable *data) 717 { 718 B_SET_CHANNEL(data->enable_bits, 0, true); 719 B_SET_CHANNEL(data->enable_bits, 1, true); 720 B_SET_CHANNEL(data->enable_bits, 2, true); 721 B_SET_CHANNEL(data->enable_bits, 3, true); 722 data->lock_source = B_MULTI_LOCK_INTERNAL; 723 /* 724 uint32 lock_source; 725 int32 lock_data; 726 uint32 timecode_source; 727 uint32 * connectors; 728 */ 729 return B_OK; 730 } 731 732 733 static status_t 734 auich_get_global_format(auich_dev *card, multi_format_info *data) 735 { 736 data->output_latency = 0; 737 data->input_latency = 0; 738 data->timecode_kind = 0; 739 switch (current_settings.sample_rate) { 740 case 48000: 741 data->input.rate = data->output.rate = B_SR_48000; 742 data->input.cvsr = data->output.cvsr = 48000; 743 break; 744 case 44100: 745 data->input.rate = data->output.rate = B_SR_44100; 746 data->input.cvsr = data->output.cvsr = 44100; 747 break; 748 } 749 data->input.format = data->output.format = B_FMT_16BIT; 750 return B_OK; 751 } 752 753 754 static status_t 755 auich_set_global_format(auich_dev *card, multi_format_info* data) 756 { 757 // TODO: it looks like we're not supposed to fail; fix this! 758 return B_OK; 759 } 760 761 762 static status_t 763 auich_get_buffers(auich_dev *card, multi_buffer_list *data) 764 { 765 uint8 i, j, pchannels, rchannels, bufcount; 766 767 LOG(("flags = %#x\n",data->flags)); 768 LOG(("request_playback_buffers = %#x\n",data->request_playback_buffers)); 769 LOG(("request_playback_channels = %#x\n",data->request_playback_channels)); 770 LOG(("request_playback_buffer_size = %#x\n",data->request_playback_buffer_size)); 771 LOG(("request_record_buffers = %#x\n",data->request_record_buffers)); 772 LOG(("request_record_channels = %#x\n",data->request_record_channels)); 773 LOG(("request_record_buffer_size = %#x\n",data->request_record_buffer_size)); 774 775 pchannels = card->pstream->channels; 776 rchannels = card->rstream->channels; 777 778 if (data->request_playback_buffers < current_settings.buffer_count || 779 data->request_playback_channels < (pchannels) || 780 data->request_record_buffers < current_settings.buffer_count || 781 data->request_record_channels < (rchannels)) { 782 LOG(("not enough channels/buffers\n")); 783 } 784 785 ASSERT(current_settings.buffer_count == 2); 786 787 data->flags = B_MULTI_BUFFER_PLAYBACK | B_MULTI_BUFFER_RECORD; // XXX ??? 788 // data->flags = 0; 789 790 data->return_playback_buffers = current_settings.buffer_count; /* playback_buffers[b][] */ 791 data->return_playback_channels = pchannels; /* playback_buffers[][c] */ 792 data->return_playback_buffer_size = current_settings.buffer_frames; /* frames */ 793 794 bufcount = current_settings.buffer_count; 795 if (bufcount > data->request_playback_buffers) 796 bufcount = data->request_playback_buffers; 797 798 for (i = 0; i < bufcount; i++) { 799 struct buffer_desc descs[data->return_playback_channels]; 800 for (j=0; j<pchannels; j++) 801 auich_stream_get_nth_buffer(card->pstream, j, i, 802 &descs[j].base, 803 &descs[j].stride); 804 if (!IS_USER_ADDRESS(data->playback_buffers[i]) 805 || user_memcpy(data->playback_buffers[i], descs, sizeof(descs)) 806 < B_OK) { 807 return B_BAD_ADDRESS; 808 } 809 } 810 data->return_record_buffers = current_settings.buffer_count; 811 data->return_record_channels = rchannels; 812 data->return_record_buffer_size = current_settings.buffer_frames; /* frames */ 813 814 bufcount = current_settings.buffer_count; 815 if (bufcount > data->request_record_buffers) 816 bufcount = data->request_record_buffers; 817 818 for (i = 0; i < bufcount; i++) { 819 struct buffer_desc descs[data->return_record_channels]; 820 for (j=0; j<rchannels; j++) 821 auich_stream_get_nth_buffer(card->rstream, j, i, 822 &descs[j].base, 823 &descs[j].stride); 824 if (!IS_USER_ADDRESS(data->record_buffers[i]) 825 || user_memcpy(data->record_buffers[i], descs, sizeof(descs)) 826 < B_OK) { 827 return B_BAD_ADDRESS; 828 } 829 } 830 return B_OK; 831 } 832 833 834 static void 835 auich_play_inth(void* inthparams) 836 { 837 auich_stream *stream = (auich_stream *)inthparams; 838 //int32 count; 839 840 acquire_spinlock(&slock); 841 stream->real_time = system_time(); 842 stream->frames_count += current_settings.buffer_frames; 843 stream->buffer_cycle = (stream->trigblk 844 + stream->blkmod - 1) % stream->blkmod; 845 stream->update_needed = true; 846 release_spinlock(&slock); 847 848 TRACE(("auich_play_inth : cycle : %d\n", stream->buffer_cycle)); 849 850 //get_sem_count(stream->card->buffer_ready_sem, &count); 851 //if (count <= 0) 852 release_sem_etc(stream->card->buffer_ready_sem, 1, B_DO_NOT_RESCHEDULE); 853 } 854 855 856 static void 857 auich_record_inth(void* inthparams) 858 { 859 auich_stream *stream = (auich_stream *)inthparams; 860 //int32 count; 861 862 acquire_spinlock(&slock); 863 stream->real_time = system_time(); 864 stream->frames_count += current_settings.buffer_frames; 865 stream->buffer_cycle = (stream->trigblk 866 + stream->blkmod - 1) % stream->blkmod; 867 stream->update_needed = true; 868 release_spinlock(&slock); 869 870 TRACE(("auich_record_inth : cycle : %d\n", stream->buffer_cycle)); 871 872 //get_sem_count(stream->card->buffer_ready_sem, &count); 873 //if (count <= 0) 874 release_sem_etc(stream->card->buffer_ready_sem, 1, B_DO_NOT_RESCHEDULE); 875 } 876 877 878 static status_t 879 auich_buffer_exchange(auich_dev *card, multi_buffer_info *data) 880 { 881 cpu_status status; 882 auich_stream *pstream, *rstream; 883 multi_buffer_info buffer_info; 884 885 #ifdef __HAIKU__ 886 if (user_memcpy(&buffer_info, data, sizeof(buffer_info)) < B_OK) 887 return B_BAD_ADDRESS; 888 #else 889 memcpy(&buffer_info, data, sizeof(buffer_info)); 890 #endif 891 892 buffer_info.flags = B_MULTI_BUFFER_PLAYBACK | B_MULTI_BUFFER_RECORD; 893 894 if (!(card->pstream->state & AUICH_STATE_STARTED)) 895 auich_stream_start(card->pstream, auich_play_inth, card->pstream); 896 897 if (!(card->rstream->state & AUICH_STATE_STARTED)) 898 auich_stream_start(card->rstream, auich_record_inth, card->rstream); 899 900 if (acquire_sem_etc(card->buffer_ready_sem, 1, B_RELATIVE_TIMEOUT | B_CAN_INTERRUPT, 50000) 901 == B_TIMED_OUT) { 902 LOG(("buffer_exchange timeout ff\n")); 903 } 904 905 status = lock(); 906 907 LIST_FOREACH(pstream, &card->streams, next) { 908 if ((pstream->use & AUICH_USE_PLAY) == 0 || 909 (pstream->state & AUICH_STATE_STARTED) == 0) 910 continue; 911 if (pstream->update_needed) 912 break; 913 } 914 915 LIST_FOREACH(rstream, &card->streams, next) { 916 if ((rstream->use & AUICH_USE_RECORD) == 0 || 917 (rstream->state & AUICH_STATE_STARTED) == 0) 918 continue; 919 if (rstream->update_needed) 920 break; 921 } 922 923 if (!pstream) 924 pstream = card->pstream; 925 if (!rstream) 926 rstream = card->rstream; 927 928 /* do playback */ 929 buffer_info.playback_buffer_cycle = pstream->buffer_cycle; 930 buffer_info.played_real_time = pstream->real_time; 931 buffer_info.played_frames_count = pstream->frames_count; 932 buffer_info._reserved_0 = pstream->first_channel; 933 pstream->update_needed = false; 934 935 /* do record */ 936 buffer_info.record_buffer_cycle = rstream->buffer_cycle; 937 buffer_info.recorded_frames_count = rstream->frames_count; 938 buffer_info.recorded_real_time = rstream->real_time; 939 buffer_info._reserved_1 = rstream->first_channel; 940 rstream->update_needed = false; 941 unlock(status); 942 943 #ifdef __HAIKU__ 944 if (user_memcpy(data, &buffer_info, sizeof(buffer_info)) < B_OK) 945 return B_BAD_ADDRESS; 946 #else 947 memcpy(data, &buffer_info, sizeof(buffer_info)); 948 #endif 949 950 //TRACE(("buffer_exchange ended\n")); 951 return B_OK; 952 } 953 954 955 static status_t 956 auich_buffer_force_stop(auich_dev *card) 957 { 958 //auich_voice_halt(card->pvoice); 959 return B_OK; 960 } 961 962 963 #define cookie_type auich_dev 964 #define get_description auich_get_description 965 #define get_enabled_channels auich_get_enabled_channels 966 #define get_global_format auich_get_global_format 967 #define set_global_format auich_set_global_format 968 #define list_mix_channels auich_list_mix_channels 969 #define list_mix_controls auich_list_mix_controls 970 #define list_mix_connections auich_list_mix_connections 971 #define get_mix auich_get_mix 972 #define set_mix auich_set_mix 973 #define get_buffers auich_get_buffers 974 #define buffer_exchange auich_buffer_exchange 975 #define buffer_force_stop auich_buffer_force_stop 976 #include "../generic/multi.c" 977 978 979 static status_t 980 auich_multi_control(void *cookie, uint32 op, void *arg, size_t length) 981 { 982 auich_dev *card = (auich_dev *)cookie; 983 984 return multi_audio_control_generic(card, op, arg, length); 985 } 986 987 static status_t auich_open(const char *name, uint32 flags, void** cookie); 988 static status_t auich_close(void* cookie); 989 static status_t auich_free(void* cookie); 990 static status_t auich_control(void* cookie, uint32 op, void* arg, size_t len); 991 static status_t auich_read(void* cookie, off_t position, void *buf, size_t* num_bytes); 992 static status_t auich_write(void* cookie, off_t position, const void* buffer, size_t* num_bytes); 993 994 device_hooks multi_hooks = { 995 auich_open, /* -> open entry point */ 996 auich_close, /* -> close entry point */ 997 auich_free, /* -> free cookie */ 998 auich_control, /* -> control entry point */ 999 auich_read, /* -> read entry point */ 1000 auich_write, /* -> write entry point */ 1001 NULL, /* start select */ 1002 NULL, /* stop select */ 1003 NULL, /* scatter-gather read from the device */ 1004 NULL /* scatter-gather write to the device */ 1005 }; 1006 1007 1008 static status_t 1009 auich_open(const char *name, uint32 flags, void** cookie) 1010 { 1011 auich_dev *card = NULL; 1012 void *settings_handle; 1013 int ix; 1014 1015 LOG(("open()\n")); 1016 1017 for (ix=0; ix<num_cards; ix++) { 1018 if (!strcmp(cards[ix].name, name)) { 1019 card = &cards[ix]; 1020 } 1021 } 1022 1023 if (card == NULL) { 1024 LOG(("open() card not found %s\n", name)); 1025 for (ix=0; ix<num_cards; ix++) { 1026 LOG(("open() card available %s\n", cards[ix].name)); 1027 } 1028 return B_ERROR; 1029 } 1030 1031 LOG(("open() got card\n")); 1032 1033 if (card->pstream !=NULL) 1034 return B_ERROR; 1035 if (card->rstream !=NULL) 1036 return B_ERROR; 1037 1038 *cookie = card; 1039 card->multi.card = card; 1040 1041 // get driver settings 1042 settings_handle = load_driver_settings(AUICH_SETTINGS); 1043 if (settings_handle != NULL) { 1044 const char *item; 1045 char *end; 1046 uint32 value; 1047 1048 item = get_driver_parameter (settings_handle, "sample_rate", "48000", "48000"); 1049 value = strtoul (item, &end, 0); 1050 if (*end == '\0') 1051 current_settings.sample_rate = value; 1052 1053 item = get_driver_parameter (settings_handle, "buffer_frames", "256", "256"); 1054 value = strtoul (item, &end, 0); 1055 if (*end == '\0') 1056 current_settings.buffer_frames = value; 1057 1058 item = get_driver_parameter (settings_handle, "buffer_count", "4", "4"); 1059 value = strtoul (item, &end, 0); 1060 if (*end == '\0') 1061 current_settings.buffer_count = value; 1062 1063 unload_driver_settings(settings_handle); 1064 } 1065 1066 LOG(("stream_new\n")); 1067 1068 card->rstream = auich_stream_new(card, AUICH_USE_RECORD, current_settings.buffer_frames, current_settings.buffer_count); 1069 card->pstream = auich_stream_new(card, AUICH_USE_PLAY, current_settings.buffer_frames, current_settings.buffer_count); 1070 1071 card->buffer_ready_sem = create_sem(0, "pbuffer ready"); 1072 1073 LOG(("stream_setaudio\n")); 1074 1075 auich_stream_set_audioparms(card->pstream, 2, true, current_settings.sample_rate); 1076 auich_stream_set_audioparms(card->rstream, 2, true, current_settings.sample_rate); 1077 1078 card->pstream->first_channel = 0; 1079 card->rstream->first_channel = 2; 1080 1081 auich_stream_commit_parms(card->pstream); 1082 auich_stream_commit_parms(card->rstream); 1083 1084 auich_create_channels_list(&card->multi); 1085 1086 return B_OK; 1087 } 1088 1089 1090 static status_t 1091 auich_close(void* cookie) 1092 { 1093 //auich_dev *card = cookie; 1094 LOG(("close()\n")); 1095 1096 return B_OK; 1097 } 1098 1099 1100 static status_t 1101 auich_free(void* cookie) 1102 { 1103 auich_dev *card = cookie; 1104 auich_stream *stream; 1105 LOG(("free()\n")); 1106 1107 if (card->buffer_ready_sem > B_OK) 1108 delete_sem(card->buffer_ready_sem); 1109 1110 LIST_FOREACH(stream, &card->streams, next) { 1111 auich_stream_halt(stream); 1112 } 1113 1114 while (!LIST_EMPTY(&card->streams)) { 1115 auich_stream_delete(LIST_FIRST(&card->streams)); 1116 } 1117 1118 card->pstream = NULL; 1119 card->rstream = NULL; 1120 1121 return B_OK; 1122 } 1123 1124 1125 static status_t 1126 auich_control(void* cookie, uint32 op, void* arg, size_t len) 1127 { 1128 return auich_multi_control(cookie, op, arg, len); 1129 } 1130 1131 1132 static status_t 1133 auich_read(void* cookie, off_t position, void *buf, size_t* num_bytes) 1134 { 1135 *num_bytes = 0; /* tell caller nothing was read */ 1136 return B_IO_ERROR; 1137 } 1138 1139 1140 static status_t 1141 auich_write(void* cookie, off_t position, const void* buffer, size_t* num_bytes) 1142 { 1143 *num_bytes = 0; /* tell caller nothing was written */ 1144 return B_IO_ERROR; 1145 } 1146