1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Load Analog Devices SigmaStudio firmware files 4 * 5 * Copyright 2009-2014 Analog Devices Inc. 6 */ 7 8 #include <linux/crc32.h> 9 #include <linux/firmware.h> 10 #include <linux/kernel.h> 11 #include <linux/i2c.h> 12 #include <linux/regmap.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 16 #include <sound/control.h> 17 #include <sound/soc.h> 18 19 #include "sigmadsp.h" 20 21 #define SIGMA_MAGIC "ADISIGM" 22 23 #define SIGMA_FW_CHUNK_TYPE_DATA 0 24 #define SIGMA_FW_CHUNK_TYPE_CONTROL 1 25 #define SIGMA_FW_CHUNK_TYPE_SAMPLERATES 2 26 27 #define READBACK_CTRL_NAME "ReadBack" 28 29 struct sigmadsp_control { 30 struct list_head head; 31 uint32_t samplerates; 32 unsigned int addr; 33 unsigned int num_bytes; 34 const char *name; 35 struct snd_kcontrol *kcontrol; 36 bool is_readback; 37 bool cached; 38 uint8_t cache[]; 39 }; 40 41 struct sigmadsp_data { 42 struct list_head head; 43 uint32_t samplerates; 44 unsigned int addr; 45 unsigned int length; 46 uint8_t data[] __counted_by(length); 47 }; 48 49 struct sigma_fw_chunk { 50 __le32 length; 51 __le32 tag; 52 __le32 samplerates; 53 } __packed; 54 55 struct sigma_fw_chunk_data { 56 struct sigma_fw_chunk chunk; 57 __le16 addr; 58 uint8_t data[]; 59 } __packed; 60 61 struct sigma_fw_chunk_control { 62 struct sigma_fw_chunk chunk; 63 __le16 type; 64 __le16 addr; 65 __le16 num_bytes; 66 const char name[]; 67 } __packed; 68 69 struct sigma_fw_chunk_samplerate { 70 struct sigma_fw_chunk chunk; 71 __le32 samplerates[]; 72 } __packed; 73 74 struct sigma_firmware_header { 75 unsigned char magic[7]; 76 u8 version; 77 __le32 crc; 78 } __packed; 79 80 enum { 81 SIGMA_ACTION_WRITEXBYTES = 0, 82 SIGMA_ACTION_WRITESINGLE, 83 SIGMA_ACTION_WRITESAFELOAD, 84 SIGMA_ACTION_END, 85 }; 86 87 struct sigma_action { 88 u8 instr; 89 u8 len_hi; 90 __le16 len; 91 __be16 addr; 92 unsigned char payload[]; 93 } __packed; 94 95 static int sigmadsp_write(struct sigmadsp *sigmadsp, unsigned int addr, 96 const uint8_t data[], size_t len) 97 { 98 return sigmadsp->write(sigmadsp->control_data, addr, data, len); 99 } 100 101 static int sigmadsp_read(struct sigmadsp *sigmadsp, unsigned int addr, 102 uint8_t data[], size_t len) 103 { 104 return sigmadsp->read(sigmadsp->control_data, addr, data, len); 105 } 106 107 static int sigmadsp_ctrl_info(struct snd_kcontrol *kcontrol, 108 struct snd_ctl_elem_info *info) 109 { 110 struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; 111 112 info->type = SNDRV_CTL_ELEM_TYPE_BYTES; 113 info->count = ctrl->num_bytes; 114 115 return 0; 116 } 117 118 static int sigmadsp_ctrl_write(struct sigmadsp *sigmadsp, 119 struct sigmadsp_control *ctrl, void *data) 120 { 121 /* safeload loads up to 20 bytes in a atomic operation */ 122 if (ctrl->num_bytes <= 20 && sigmadsp->ops && sigmadsp->ops->safeload) 123 return sigmadsp->ops->safeload(sigmadsp, ctrl->addr, data, 124 ctrl->num_bytes); 125 else 126 return sigmadsp_write(sigmadsp, ctrl->addr, data, 127 ctrl->num_bytes); 128 } 129 130 static int sigmadsp_ctrl_put(struct snd_kcontrol *kcontrol, 131 struct snd_ctl_elem_value *ucontrol) 132 { 133 struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; 134 struct sigmadsp *sigmadsp = snd_kcontrol_chip(kcontrol); 135 uint8_t *data; 136 int ret = 0; 137 138 mutex_lock(&sigmadsp->lock); 139 140 data = ucontrol->value.bytes.data; 141 142 if (!(kcontrol->vd[0].access & SNDRV_CTL_ELEM_ACCESS_INACTIVE)) 143 ret = sigmadsp_ctrl_write(sigmadsp, ctrl, data); 144 145 if (ret == 0) { 146 memcpy(ctrl->cache, data, ctrl->num_bytes); 147 if (!ctrl->is_readback) 148 ctrl->cached = true; 149 } 150 151 mutex_unlock(&sigmadsp->lock); 152 153 return ret; 154 } 155 156 static int sigmadsp_ctrl_get(struct snd_kcontrol *kcontrol, 157 struct snd_ctl_elem_value *ucontrol) 158 { 159 struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; 160 struct sigmadsp *sigmadsp = snd_kcontrol_chip(kcontrol); 161 int ret = 0; 162 163 mutex_lock(&sigmadsp->lock); 164 165 if (!ctrl->cached) { 166 ret = sigmadsp_read(sigmadsp, ctrl->addr, ctrl->cache, 167 ctrl->num_bytes); 168 } 169 170 if (ret == 0) { 171 if (!ctrl->is_readback) 172 ctrl->cached = true; 173 memcpy(ucontrol->value.bytes.data, ctrl->cache, 174 ctrl->num_bytes); 175 } 176 177 mutex_unlock(&sigmadsp->lock); 178 179 return ret; 180 } 181 182 static void sigmadsp_control_free(struct snd_kcontrol *kcontrol) 183 { 184 struct sigmadsp_control *ctrl = (void *)kcontrol->private_value; 185 186 ctrl->kcontrol = NULL; 187 } 188 189 static bool sigma_fw_validate_control_name(const char *name, unsigned int len) 190 { 191 unsigned int i; 192 193 for (i = 0; i < len; i++) { 194 /* Normal ASCII characters are valid */ 195 if (name[i] < ' ' || name[i] > '~') 196 return false; 197 } 198 199 return true; 200 } 201 202 static int sigma_fw_load_control(struct sigmadsp *sigmadsp, 203 const struct sigma_fw_chunk *chunk, unsigned int length) 204 { 205 const struct sigma_fw_chunk_control *ctrl_chunk; 206 struct sigmadsp_control *ctrl; 207 unsigned int num_bytes; 208 size_t name_len; 209 char *name; 210 int ret; 211 212 if (length <= sizeof(*ctrl_chunk)) 213 return -EINVAL; 214 215 ctrl_chunk = (const struct sigma_fw_chunk_control *)chunk; 216 217 name_len = length - sizeof(*ctrl_chunk); 218 if (name_len >= SNDRV_CTL_ELEM_ID_NAME_MAXLEN) 219 name_len = SNDRV_CTL_ELEM_ID_NAME_MAXLEN - 1; 220 221 /* Make sure there are no non-displayable characaters in the string */ 222 if (!sigma_fw_validate_control_name(ctrl_chunk->name, name_len)) 223 return -EINVAL; 224 225 num_bytes = le16_to_cpu(ctrl_chunk->num_bytes); 226 ctrl = kzalloc(sizeof(*ctrl) + num_bytes, GFP_KERNEL); 227 if (!ctrl) 228 return -ENOMEM; 229 230 name = kmemdup_nul(ctrl_chunk->name, name_len, GFP_KERNEL); 231 if (!name) { 232 ret = -ENOMEM; 233 goto err_free_ctrl; 234 } 235 ctrl->name = name; 236 237 /* 238 * Readbacks doesn't work with non-volatile controls, since the 239 * firmware updates the control value without driver interaction. Mark 240 * the readbacks to ensure that the values are not cached. 241 */ 242 if (ctrl->name && strncmp(ctrl->name, READBACK_CTRL_NAME, 243 (sizeof(READBACK_CTRL_NAME) - 1)) == 0) 244 ctrl->is_readback = true; 245 246 ctrl->addr = le16_to_cpu(ctrl_chunk->addr); 247 ctrl->num_bytes = num_bytes; 248 ctrl->samplerates = le32_to_cpu(chunk->samplerates); 249 250 list_add_tail(&ctrl->head, &sigmadsp->ctrl_list); 251 252 return 0; 253 254 err_free_ctrl: 255 kfree(ctrl); 256 257 return ret; 258 } 259 260 static int sigma_fw_load_data(struct sigmadsp *sigmadsp, 261 const struct sigma_fw_chunk *chunk, unsigned int length) 262 { 263 const struct sigma_fw_chunk_data *data_chunk; 264 struct sigmadsp_data *data; 265 266 if (length <= sizeof(*data_chunk)) 267 return -EINVAL; 268 269 data_chunk = (struct sigma_fw_chunk_data *)chunk; 270 271 length -= sizeof(*data_chunk); 272 273 data = kzalloc(struct_size(data, data, length), GFP_KERNEL); 274 if (!data) 275 return -ENOMEM; 276 277 data->addr = le16_to_cpu(data_chunk->addr); 278 data->length = length; 279 data->samplerates = le32_to_cpu(chunk->samplerates); 280 memcpy(data->data, data_chunk->data, length); 281 list_add_tail(&data->head, &sigmadsp->data_list); 282 283 return 0; 284 } 285 286 static int sigma_fw_load_samplerates(struct sigmadsp *sigmadsp, 287 const struct sigma_fw_chunk *chunk, unsigned int length) 288 { 289 const struct sigma_fw_chunk_samplerate *rate_chunk; 290 unsigned int num_rates; 291 unsigned int *rates; 292 unsigned int i; 293 294 rate_chunk = (const struct sigma_fw_chunk_samplerate *)chunk; 295 296 num_rates = (length - sizeof(*rate_chunk)) / sizeof(__le32); 297 298 if (num_rates > 32 || num_rates == 0) 299 return -EINVAL; 300 301 /* We only allow one samplerates block per file */ 302 if (sigmadsp->rate_constraints.count) 303 return -EINVAL; 304 305 rates = kcalloc(num_rates, sizeof(*rates), GFP_KERNEL); 306 if (!rates) 307 return -ENOMEM; 308 309 for (i = 0; i < num_rates; i++) 310 rates[i] = le32_to_cpu(rate_chunk->samplerates[i]); 311 312 sigmadsp->rate_constraints.count = num_rates; 313 sigmadsp->rate_constraints.list = rates; 314 315 return 0; 316 } 317 318 static int sigmadsp_fw_load_v2(struct sigmadsp *sigmadsp, 319 const struct firmware *fw) 320 { 321 struct sigma_fw_chunk *chunk; 322 unsigned int length, pos; 323 int ret; 324 325 /* 326 * Make sure that there is at least one chunk to avoid integer 327 * underflows later on. Empty firmware is still valid though. 328 */ 329 if (fw->size < sizeof(*chunk) + sizeof(struct sigma_firmware_header)) 330 return 0; 331 332 pos = sizeof(struct sigma_firmware_header); 333 334 while (pos < fw->size - sizeof(*chunk)) { 335 chunk = (struct sigma_fw_chunk *)(fw->data + pos); 336 337 length = le32_to_cpu(chunk->length); 338 339 if (length > fw->size - pos || length < sizeof(*chunk)) 340 return -EINVAL; 341 342 switch (le32_to_cpu(chunk->tag)) { 343 case SIGMA_FW_CHUNK_TYPE_DATA: 344 ret = sigma_fw_load_data(sigmadsp, chunk, length); 345 break; 346 case SIGMA_FW_CHUNK_TYPE_CONTROL: 347 ret = sigma_fw_load_control(sigmadsp, chunk, length); 348 break; 349 case SIGMA_FW_CHUNK_TYPE_SAMPLERATES: 350 ret = sigma_fw_load_samplerates(sigmadsp, chunk, length); 351 break; 352 default: 353 dev_warn(sigmadsp->dev, "Unknown chunk type: %d\n", 354 chunk->tag); 355 ret = 0; 356 break; 357 } 358 359 if (ret) 360 return ret; 361 362 /* 363 * This can not overflow since if length is larger than the 364 * maximum firmware size (0x4000000) we'll error out earilier. 365 */ 366 pos += ALIGN(length, sizeof(__le32)); 367 } 368 369 return 0; 370 } 371 372 static inline u32 sigma_action_len(struct sigma_action *sa) 373 { 374 return (sa->len_hi << 16) | le16_to_cpu(sa->len); 375 } 376 377 static size_t sigma_action_size(struct sigma_action *sa) 378 { 379 size_t payload = 0; 380 381 switch (sa->instr) { 382 case SIGMA_ACTION_WRITEXBYTES: 383 case SIGMA_ACTION_WRITESINGLE: 384 case SIGMA_ACTION_WRITESAFELOAD: 385 payload = sigma_action_len(sa); 386 break; 387 default: 388 break; 389 } 390 391 payload = ALIGN(payload, 2); 392 393 return payload + sizeof(struct sigma_action); 394 } 395 396 /* 397 * Returns a negative error value in case of an error, 0 if processing of 398 * the firmware should be stopped after this action, 1 otherwise. 399 */ 400 static int process_sigma_action(struct sigmadsp *sigmadsp, 401 struct sigma_action *sa) 402 { 403 size_t len = sigma_action_len(sa); 404 struct sigmadsp_data *data; 405 406 pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__, 407 sa->instr, sa->addr, len); 408 409 switch (sa->instr) { 410 case SIGMA_ACTION_WRITEXBYTES: 411 case SIGMA_ACTION_WRITESINGLE: 412 case SIGMA_ACTION_WRITESAFELOAD: 413 if (len < 3) 414 return -EINVAL; 415 416 data = kzalloc(struct_size(data, data, size_sub(len, 2)), 417 GFP_KERNEL); 418 if (!data) 419 return -ENOMEM; 420 421 data->addr = be16_to_cpu(sa->addr); 422 data->length = len - 2; 423 memcpy(data->data, sa->payload, data->length); 424 list_add_tail(&data->head, &sigmadsp->data_list); 425 break; 426 case SIGMA_ACTION_END: 427 return 0; 428 default: 429 return -EINVAL; 430 } 431 432 return 1; 433 } 434 435 static int sigmadsp_fw_load_v1(struct sigmadsp *sigmadsp, 436 const struct firmware *fw) 437 { 438 struct sigma_action *sa; 439 size_t size, pos; 440 int ret; 441 442 pos = sizeof(struct sigma_firmware_header); 443 444 while (pos + sizeof(*sa) <= fw->size) { 445 sa = (struct sigma_action *)(fw->data + pos); 446 447 size = sigma_action_size(sa); 448 pos += size; 449 if (pos > fw->size || size == 0) 450 break; 451 452 ret = process_sigma_action(sigmadsp, sa); 453 454 pr_debug("%s: action returned %i\n", __func__, ret); 455 456 if (ret <= 0) 457 return ret; 458 } 459 460 if (pos != fw->size) 461 return -EINVAL; 462 463 return 0; 464 } 465 466 static void sigmadsp_firmware_release(struct sigmadsp *sigmadsp) 467 { 468 struct sigmadsp_control *ctrl, *_ctrl; 469 struct sigmadsp_data *data, *_data; 470 471 list_for_each_entry_safe(ctrl, _ctrl, &sigmadsp->ctrl_list, head) { 472 kfree(ctrl->name); 473 kfree(ctrl); 474 } 475 476 list_for_each_entry_safe(data, _data, &sigmadsp->data_list, head) 477 kfree(data); 478 479 INIT_LIST_HEAD(&sigmadsp->ctrl_list); 480 INIT_LIST_HEAD(&sigmadsp->data_list); 481 } 482 483 static void devm_sigmadsp_release(struct device *dev, void *res) 484 { 485 sigmadsp_firmware_release((struct sigmadsp *)res); 486 } 487 488 static int sigmadsp_firmware_load(struct sigmadsp *sigmadsp, const char *name) 489 { 490 const struct sigma_firmware_header *ssfw_head; 491 const struct firmware *fw; 492 int ret; 493 u32 crc; 494 495 /* first load the blob */ 496 ret = request_firmware(&fw, name, sigmadsp->dev); 497 if (ret) { 498 pr_debug("%s: request_firmware() failed with %i\n", __func__, ret); 499 goto done; 500 } 501 502 /* then verify the header */ 503 ret = -EINVAL; 504 505 /* 506 * Reject too small or unreasonable large files. The upper limit has been 507 * chosen a bit arbitrarily, but it should be enough for all practical 508 * purposes and having the limit makes it easier to avoid integer 509 * overflows later in the loading process. 510 */ 511 if (fw->size < sizeof(*ssfw_head) || fw->size >= 0x4000000) { 512 dev_err(sigmadsp->dev, "Failed to load firmware: Invalid size\n"); 513 goto done; 514 } 515 516 ssfw_head = (void *)fw->data; 517 if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) { 518 dev_err(sigmadsp->dev, "Failed to load firmware: Invalid magic\n"); 519 goto done; 520 } 521 522 crc = crc32(0, fw->data + sizeof(*ssfw_head), 523 fw->size - sizeof(*ssfw_head)); 524 pr_debug("%s: crc=%x\n", __func__, crc); 525 if (crc != le32_to_cpu(ssfw_head->crc)) { 526 dev_err(sigmadsp->dev, "Failed to load firmware: Wrong crc checksum: expected %x got %x\n", 527 le32_to_cpu(ssfw_head->crc), crc); 528 goto done; 529 } 530 531 switch (ssfw_head->version) { 532 case 1: 533 ret = sigmadsp_fw_load_v1(sigmadsp, fw); 534 break; 535 case 2: 536 ret = sigmadsp_fw_load_v2(sigmadsp, fw); 537 break; 538 default: 539 dev_err(sigmadsp->dev, 540 "Failed to load firmware: Invalid version %d. Supported firmware versions: 1, 2\n", 541 ssfw_head->version); 542 ret = -EINVAL; 543 break; 544 } 545 546 if (ret) 547 sigmadsp_firmware_release(sigmadsp); 548 549 done: 550 release_firmware(fw); 551 552 return ret; 553 } 554 555 static int sigmadsp_init(struct sigmadsp *sigmadsp, struct device *dev, 556 const struct sigmadsp_ops *ops, const char *firmware_name) 557 { 558 sigmadsp->ops = ops; 559 sigmadsp->dev = dev; 560 561 INIT_LIST_HEAD(&sigmadsp->ctrl_list); 562 INIT_LIST_HEAD(&sigmadsp->data_list); 563 mutex_init(&sigmadsp->lock); 564 565 return sigmadsp_firmware_load(sigmadsp, firmware_name); 566 } 567 568 /** 569 * devm_sigmadsp_init() - Initialize SigmaDSP instance 570 * @dev: The parent device 571 * @ops: The sigmadsp_ops to use for this instance 572 * @firmware_name: Name of the firmware file to load 573 * 574 * Allocates a SigmaDSP instance and loads the specified firmware file. 575 * 576 * Returns a pointer to a struct sigmadsp on success, or a PTR_ERR() on error. 577 */ 578 struct sigmadsp *devm_sigmadsp_init(struct device *dev, 579 const struct sigmadsp_ops *ops, const char *firmware_name) 580 { 581 struct sigmadsp *sigmadsp; 582 int ret; 583 584 sigmadsp = devres_alloc(devm_sigmadsp_release, sizeof(*sigmadsp), 585 GFP_KERNEL); 586 if (!sigmadsp) 587 return ERR_PTR(-ENOMEM); 588 589 ret = sigmadsp_init(sigmadsp, dev, ops, firmware_name); 590 if (ret) { 591 devres_free(sigmadsp); 592 return ERR_PTR(ret); 593 } 594 595 devres_add(dev, sigmadsp); 596 597 return sigmadsp; 598 } 599 EXPORT_SYMBOL_GPL(devm_sigmadsp_init); 600 601 static int sigmadsp_rate_to_index(struct sigmadsp *sigmadsp, unsigned int rate) 602 { 603 unsigned int i; 604 605 for (i = 0; i < sigmadsp->rate_constraints.count; i++) { 606 if (sigmadsp->rate_constraints.list[i] == rate) 607 return i; 608 } 609 610 return -EINVAL; 611 } 612 613 static unsigned int sigmadsp_get_samplerate_mask(struct sigmadsp *sigmadsp, 614 unsigned int samplerate) 615 { 616 int samplerate_index; 617 618 if (samplerate == 0) 619 return 0; 620 621 if (sigmadsp->rate_constraints.count) { 622 samplerate_index = sigmadsp_rate_to_index(sigmadsp, samplerate); 623 if (samplerate_index < 0) 624 return 0; 625 626 return BIT(samplerate_index); 627 } else { 628 return ~0; 629 } 630 } 631 632 static bool sigmadsp_samplerate_valid(unsigned int supported, 633 unsigned int requested) 634 { 635 /* All samplerates are supported */ 636 if (!supported) 637 return true; 638 639 return supported & requested; 640 } 641 642 static int sigmadsp_alloc_control(struct sigmadsp *sigmadsp, 643 struct sigmadsp_control *ctrl, unsigned int samplerate_mask) 644 { 645 struct snd_kcontrol_new template; 646 struct snd_kcontrol *kcontrol; 647 648 memset(&template, 0, sizeof(template)); 649 template.iface = SNDRV_CTL_ELEM_IFACE_MIXER; 650 template.name = ctrl->name; 651 template.info = sigmadsp_ctrl_info; 652 template.get = sigmadsp_ctrl_get; 653 template.put = sigmadsp_ctrl_put; 654 template.private_value = (unsigned long)ctrl; 655 template.access = SNDRV_CTL_ELEM_ACCESS_READWRITE; 656 if (!sigmadsp_samplerate_valid(ctrl->samplerates, samplerate_mask)) 657 template.access |= SNDRV_CTL_ELEM_ACCESS_INACTIVE; 658 659 kcontrol = snd_ctl_new1(&template, sigmadsp); 660 if (!kcontrol) 661 return -ENOMEM; 662 663 kcontrol->private_free = sigmadsp_control_free; 664 ctrl->kcontrol = kcontrol; 665 666 return snd_ctl_add(sigmadsp->component->card->snd_card, kcontrol); 667 } 668 669 static void sigmadsp_activate_ctrl(struct sigmadsp *sigmadsp, 670 struct sigmadsp_control *ctrl, unsigned int samplerate_mask) 671 { 672 struct snd_card *card = sigmadsp->component->card->snd_card; 673 bool active; 674 int changed; 675 676 active = sigmadsp_samplerate_valid(ctrl->samplerates, samplerate_mask); 677 if (!ctrl->kcontrol) 678 return; 679 changed = snd_ctl_activate_id(card, &ctrl->kcontrol->id, active); 680 if (active && changed > 0) { 681 mutex_lock(&sigmadsp->lock); 682 if (ctrl->cached) 683 sigmadsp_ctrl_write(sigmadsp, ctrl, ctrl->cache); 684 mutex_unlock(&sigmadsp->lock); 685 } 686 } 687 688 /** 689 * sigmadsp_attach() - Attach a sigmadsp instance to a ASoC component 690 * @sigmadsp: The sigmadsp instance to attach 691 * @component: The component to attach to 692 * 693 * Typically called in the components probe callback. 694 * 695 * Note, once this function has been called the firmware must not be released 696 * until after the ALSA snd_card that the component belongs to has been 697 * disconnected, even if sigmadsp_attach() returns an error. 698 */ 699 int sigmadsp_attach(struct sigmadsp *sigmadsp, 700 struct snd_soc_component *component) 701 { 702 struct sigmadsp_control *ctrl; 703 unsigned int samplerate_mask; 704 int ret; 705 706 sigmadsp->component = component; 707 708 samplerate_mask = sigmadsp_get_samplerate_mask(sigmadsp, 709 sigmadsp->current_samplerate); 710 711 list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) { 712 ret = sigmadsp_alloc_control(sigmadsp, ctrl, samplerate_mask); 713 if (ret) 714 return ret; 715 } 716 717 return 0; 718 } 719 EXPORT_SYMBOL_GPL(sigmadsp_attach); 720 721 /** 722 * sigmadsp_setup() - Setup the DSP for the specified samplerate 723 * @sigmadsp: The sigmadsp instance to configure 724 * @samplerate: The samplerate the DSP should be configured for 725 * 726 * Loads the appropriate firmware program and parameter memory (if not already 727 * loaded) and enables the controls for the specified samplerate. Any control 728 * parameter changes that have been made previously will be restored. 729 * 730 * Returns 0 on success, a negative error code otherwise. 731 */ 732 int sigmadsp_setup(struct sigmadsp *sigmadsp, unsigned int samplerate) 733 { 734 struct sigmadsp_control *ctrl; 735 unsigned int samplerate_mask; 736 struct sigmadsp_data *data; 737 int ret; 738 739 if (sigmadsp->current_samplerate == samplerate) 740 return 0; 741 742 samplerate_mask = sigmadsp_get_samplerate_mask(sigmadsp, samplerate); 743 if (samplerate_mask == 0) 744 return -EINVAL; 745 746 list_for_each_entry(data, &sigmadsp->data_list, head) { 747 if (!sigmadsp_samplerate_valid(data->samplerates, 748 samplerate_mask)) 749 continue; 750 ret = sigmadsp_write(sigmadsp, data->addr, data->data, 751 data->length); 752 if (ret) 753 goto err; 754 } 755 756 list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) 757 sigmadsp_activate_ctrl(sigmadsp, ctrl, samplerate_mask); 758 759 sigmadsp->current_samplerate = samplerate; 760 761 return 0; 762 err: 763 sigmadsp_reset(sigmadsp); 764 765 return ret; 766 } 767 EXPORT_SYMBOL_GPL(sigmadsp_setup); 768 769 /** 770 * sigmadsp_reset() - Notify the sigmadsp instance that the DSP has been reset 771 * @sigmadsp: The sigmadsp instance to reset 772 * 773 * Should be called whenever the DSP has been reset and parameter and program 774 * memory need to be re-loaded. 775 */ 776 void sigmadsp_reset(struct sigmadsp *sigmadsp) 777 { 778 struct sigmadsp_control *ctrl; 779 780 list_for_each_entry(ctrl, &sigmadsp->ctrl_list, head) 781 sigmadsp_activate_ctrl(sigmadsp, ctrl, false); 782 783 sigmadsp->current_samplerate = 0; 784 } 785 EXPORT_SYMBOL_GPL(sigmadsp_reset); 786 787 /** 788 * sigmadsp_restrict_params() - Applies DSP firmware specific constraints 789 * @sigmadsp: The sigmadsp instance 790 * @substream: The substream to restrict 791 * 792 * Applies samplerate constraints that may be required by the firmware Should 793 * typically be called from the CODEC/component drivers startup callback. 794 * 795 * Returns 0 on success, a negative error code otherwise. 796 */ 797 int sigmadsp_restrict_params(struct sigmadsp *sigmadsp, 798 struct snd_pcm_substream *substream) 799 { 800 if (sigmadsp->rate_constraints.count == 0) 801 return 0; 802 803 return snd_pcm_hw_constraint_list(substream->runtime, 0, 804 SNDRV_PCM_HW_PARAM_RATE, &sigmadsp->rate_constraints); 805 } 806 EXPORT_SYMBOL_GPL(sigmadsp_restrict_params); 807 808 MODULE_LICENSE("GPL"); 809