hdac_device.c 26.6 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
/*
 * HD-audio codec core device
 */

#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm_runtime.h>
#include <sound/hdaudio.h>
#include <sound/hda_regmap.h>
#include <sound/pcm.h>
#include "local.h"

static void setup_fg_nodes(struct hdac_device *codec);
static int get_codec_vendor_name(struct hdac_device *codec);

static void default_release(struct device *dev)
{
	snd_hdac_device_exit(container_of(dev, struct hdac_device, dev));
}

/**
 * snd_hdac_device_init - initialize the HD-audio codec base device
 * @codec: device to initialize
 * @bus: but to attach
 * @name: device name string
 * @addr: codec address
 *
 * Returns zero for success or a negative error code.
 *
 * This function increments the runtime PM counter and marks it active.
 * The caller needs to turn it off appropriately later.
 *
 * The caller needs to set the device's release op properly by itself.
 */
int snd_hdac_device_init(struct hdac_device *codec, struct hdac_bus *bus,
			 const char *name, unsigned int addr)
{
	struct device *dev;
	hda_nid_t fg;
	int err;

	dev = &codec->dev;
	device_initialize(dev);
	dev->parent = bus->dev;
	dev->bus = &snd_hda_bus_type;
	dev->release = default_release;
	dev->groups = hdac_dev_attr_groups;
	dev_set_name(dev, "%s", name);
	device_enable_async_suspend(dev);

	codec->bus = bus;
	codec->addr = addr;
	codec->type = HDA_DEV_CORE;
	pm_runtime_set_active(&codec->dev);
	pm_runtime_get_noresume(&codec->dev);
	atomic_set(&codec->in_pm, 0);

	err = snd_hdac_bus_add_device(bus, codec);
	if (err < 0)
		goto error;

	/* fill parameters */
	codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
					      AC_PAR_VENDOR_ID);
	if (codec->vendor_id == -1) {
		/* read again, hopefully the access method was corrected
		 * in the last read...
		 */
		codec->vendor_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						      AC_PAR_VENDOR_ID);
	}

	codec->subsystem_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						 AC_PAR_SUBSYSTEM_ID);
	codec->revision_id = snd_hdac_read_parm(codec, AC_NODE_ROOT,
						AC_PAR_REV_ID);

	setup_fg_nodes(codec);
	if (!codec->afg && !codec->mfg) {
		dev_err(dev, "no AFG or MFG node found\n");
		err = -ENODEV;
		goto error;
	}

	fg = codec->afg ? codec->afg : codec->mfg;

	err = snd_hdac_refresh_widgets(codec);
	if (err < 0)
		goto error;

	codec->power_caps = snd_hdac_read_parm(codec, fg, AC_PAR_POWER_STATE);
	/* reread ssid if not set by parameter */
	if (codec->subsystem_id == -1 || codec->subsystem_id == 0)
		snd_hdac_read(codec, fg, AC_VERB_GET_SUBSYSTEM_ID, 0,
			      &codec->subsystem_id);

	err = get_codec_vendor_name(codec);
	if (err < 0)
		goto error;

	codec->chip_name = kasprintf(GFP_KERNEL, "ID %x",
				     codec->vendor_id & 0xffff);
	if (!codec->chip_name) {
		err = -ENOMEM;
		goto error;
	}

	return 0;

 error:
	put_device(&codec->dev);
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_init);

/**
 * snd_hdac_device_exit - clean up the HD-audio codec base device
 * @codec: device to clean up
 */
void snd_hdac_device_exit(struct hdac_device *codec)
{
	pm_runtime_put_noidle(&codec->dev);
	snd_hdac_bus_remove_device(codec->bus, codec);
	kfree(codec->vendor_name);
	kfree(codec->chip_name);
}
EXPORT_SYMBOL_GPL(snd_hdac_device_exit);

/**
 * snd_hdac_device_register - register the hd-audio codec base device
 * codec: the device to register
 */
int snd_hdac_device_register(struct hdac_device *codec)
{
	int err;

	err = device_add(&codec->dev);
	if (err < 0)
		return err;
	err = hda_widget_sysfs_init(codec);
	if (err < 0) {
		device_del(&codec->dev);
		return err;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_register);

/**
 * snd_hdac_device_unregister - unregister the hd-audio codec base device
 * codec: the device to unregister
 */
void snd_hdac_device_unregister(struct hdac_device *codec)
{
	if (device_is_registered(&codec->dev)) {
		hda_widget_sysfs_exit(codec);
		device_del(&codec->dev);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_device_unregister);

/**
 * snd_hdac_device_set_chip_name - set/update the codec name
 * @codec: the HDAC device
 * @name: name string to set
 *
 * Returns 0 if the name is set or updated, or a negative error code.
 */
int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name)
{
	char *newname;

	if (!name)
		return 0;
	newname = kstrdup(name, GFP_KERNEL);
	if (!newname)
		return -ENOMEM;
	kfree(codec->chip_name);
	codec->chip_name = newname;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_device_set_chip_name);

/**
 * snd_hdac_codec_modalias - give the module alias name
 * @codec: HDAC device
 * @buf: string buffer to store
 * @size: string buffer size
 *
 * Returns the size of string, like snprintf(), or a negative error code.
 */
int snd_hdac_codec_modalias(struct hdac_device *codec, char *buf, size_t size)
{
	return snprintf(buf, size, "hdaudio:v%08Xr%08Xa%02X\n",
			codec->vendor_id, codec->revision_id, codec->type);
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_modalias);

/**
 * snd_hdac_make_cmd - compose a 32bit command word to be sent to the
 *	HD-audio controller
 * @codec: the codec object
 * @nid: NID to encode
 * @verb: verb to encode
 * @parm: parameter to encode
 *
 * Return an encoded command verb or -1 for error.
 */
unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
			       unsigned int verb, unsigned int parm)
{
	u32 val, addr;

	addr = codec->addr;
	if ((addr & ~0xf) || (nid & ~0x7f) ||
	    (verb & ~0xfff) || (parm & ~0xffff)) {
		dev_err(&codec->dev, "out of range cmd %x:%x:%x:%x\n",
			addr, nid, verb, parm);
		return -1;
	}

	val = addr << 28;
	val |= (u32)nid << 20;
	val |= verb << 8;
	val |= parm;
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_make_cmd);

/**
 * snd_hdac_exec_verb - execute an encoded verb
 * @codec: the codec object
 * @cmd: encoded verb to execute
 * @flags: optional flags, pass zero for default
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 *
 * This calls the exec_verb op when set in hdac_codec.  If not,
 * call the default snd_hdac_bus_exec_verb().
 */
int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
		       unsigned int flags, unsigned int *res)
{
	if (codec->exec_verb)
		return codec->exec_verb(codec, cmd, flags, res);
	return snd_hdac_bus_exec_verb(codec->bus, codec->addr, cmd, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_exec_verb);


/**
 * snd_hdac_read - execute a verb
 * @codec: the codec object
 * @nid: NID to execute a verb
 * @verb: verb to execute
 * @parm: parameter for a verb
 * @res: the pointer to store the result, NULL if running async
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
		  unsigned int verb, unsigned int parm, unsigned int *res)
{
	unsigned int cmd = snd_hdac_make_cmd(codec, nid, verb, parm);

	return snd_hdac_exec_verb(codec, cmd, 0, res);
}
EXPORT_SYMBOL_GPL(snd_hdac_read);

/**
 * _snd_hdac_read_parm - read a parmeter
 *
 * This function returns zero or an error unlike snd_hdac_read_parm().
 */
int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
			unsigned int *res)
{
	unsigned int cmd;

	cmd = snd_hdac_regmap_encode_verb(nid, AC_VERB_PARAMETERS) | parm;
	return snd_hdac_regmap_read_raw(codec, cmd, res);
}
EXPORT_SYMBOL_GPL(_snd_hdac_read_parm);

/**
 * snd_hdac_read_parm_uncached - read a codec parameter without caching
 * @codec: the codec object
 * @nid: NID to read a parameter
 * @parm: parameter to read
 *
 * Returns -1 for error.  If you need to distinguish the error more
 * strictly, use snd_hdac_read() directly.
 */
int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
				int parm)
{
	int val;

	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, true);
	val = snd_hdac_read_parm(codec, nid, parm);
	if (codec->regmap)
		regcache_cache_bypass(codec->regmap, false);
	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_read_parm_uncached);

/**
 * snd_hdac_override_parm - override read-only parameters
 * @codec: the codec object
 * @nid: NID for the parameter
 * @parm: the parameter to change
 * @val: the parameter value to overwrite
 */
int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
			   unsigned int parm, unsigned int val)
{
	unsigned int verb = (AC_VERB_PARAMETERS << 8) | (nid << 20) | parm;
	int err;

	if (!codec->regmap)
		return -EINVAL;

	codec->caps_overwriting = true;
	err = snd_hdac_regmap_write_raw(codec, verb, val);
	codec->caps_overwriting = false;
	return err;
}
EXPORT_SYMBOL_GPL(snd_hdac_override_parm);

/**
 * snd_hdac_get_sub_nodes - get start NID and number of subtree nodes
 * @codec: the codec object
 * @nid: NID to inspect
 * @start_id: the pointer to store the starting NID
 *
 * Returns the number of subtree nodes or zero if not found.
 * This function reads parameters always without caching.
 */
int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
			   hda_nid_t *start_id)
{
	unsigned int parm;

	parm = snd_hdac_read_parm_uncached(codec, nid, AC_PAR_NODE_COUNT);
	if (parm == -1) {
		*start_id = 0;
		return 0;
	}
	*start_id = (parm >> 16) & 0x7fff;
	return (int)(parm & 0x7fff);
}
EXPORT_SYMBOL_GPL(snd_hdac_get_sub_nodes);

/*
 * look for an AFG and MFG nodes
 */
static void setup_fg_nodes(struct hdac_device *codec)
{
	int i, total_nodes, function_id;
	hda_nid_t nid;

	total_nodes = snd_hdac_get_sub_nodes(codec, AC_NODE_ROOT, &nid);
	for (i = 0; i < total_nodes; i++, nid++) {
		function_id = snd_hdac_read_parm(codec, nid,
						 AC_PAR_FUNCTION_TYPE);
		switch (function_id & 0xff) {
		case AC_GRP_AUDIO_FUNCTION:
			codec->afg = nid;
			codec->afg_function_id = function_id & 0xff;
			codec->afg_unsol = (function_id >> 8) & 1;
			break;
		case AC_GRP_MODEM_FUNCTION:
			codec->mfg = nid;
			codec->mfg_function_id = function_id & 0xff;
			codec->mfg_unsol = (function_id >> 8) & 1;
			break;
		default:
			break;
		}
	}
}

/**
 * snd_hdac_refresh_widgets - Reset the widget start/end nodes
 * @codec: the codec object
 */
int snd_hdac_refresh_widgets(struct hdac_device *codec)
{
	hda_nid_t start_nid;
	int nums;

	nums = snd_hdac_get_sub_nodes(codec, codec->afg, &start_nid);
	if (!start_nid || nums <= 0 || nums >= 0xff) {
		dev_err(&codec->dev, "cannot read sub nodes for FG 0x%02x\n",
			codec->afg);
		return -EINVAL;
	}

	codec->num_nodes = nums;
	codec->start_nid = start_nid;
	codec->end_nid = start_nid + nums;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widgets);

/**
 * snd_hdac_refresh_widget_sysfs - Reset the codec widgets and reinit the
 * codec sysfs
 * @codec: the codec object
 *
 * first we need to remove sysfs, then refresh widgets and lastly
 * recreate it
 */
int snd_hdac_refresh_widget_sysfs(struct hdac_device *codec)
{
	int ret;

	if (device_is_registered(&codec->dev))
		hda_widget_sysfs_exit(codec);
	ret = snd_hdac_refresh_widgets(codec);
	if (ret) {
		dev_err(&codec->dev, "failed to refresh widget: %d\n", ret);
		return ret;
	}
	if (device_is_registered(&codec->dev)) {
		ret = hda_widget_sysfs_init(codec);
		if (ret) {
			dev_err(&codec->dev, "failed to init sysfs: %d\n", ret);
			return ret;
		}
	}
	return ret;
}
EXPORT_SYMBOL_GPL(snd_hdac_refresh_widget_sysfs);

/* return CONNLIST_LEN parameter of the given widget */
static unsigned int get_num_conns(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int wcaps = get_wcaps(codec, nid);
	unsigned int parm;

	if (!(wcaps & AC_WCAP_CONN_LIST) &&
	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
		return 0;

	parm = snd_hdac_read_parm(codec, nid, AC_PAR_CONNLIST_LEN);
	if (parm == -1)
		parm = 0;
	return parm;
}

/**
 * snd_hdac_get_connections - get a widget connection list
 * @codec: the codec object
 * @nid: NID
 * @conn_list: the array to store the results, can be NULL
 * @max_conns: the max size of the given array
 *
 * Returns the number of connected widgets, zero for no connection, or a
 * negative error code.  When the number of elements don't fit with the
 * given array size, it returns -ENOSPC.
 *
 * When @conn_list is NULL, it just checks the number of connections.
 */
int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
			     hda_nid_t *conn_list, int max_conns)
{
	unsigned int parm;
	int i, conn_len, conns, err;
	unsigned int shift, num_elems, mask;
	hda_nid_t prev_nid;
	int null_count = 0;

	parm = get_num_conns(codec, nid);
	if (!parm)
		return 0;

	if (parm & AC_CLIST_LONG) {
		/* long form */
		shift = 16;
		num_elems = 2;
	} else {
		/* short form */
		shift = 8;
		num_elems = 4;
	}
	conn_len = parm & AC_CLIST_LENGTH;
	mask = (1 << (shift-1)) - 1;

	if (!conn_len)
		return 0; /* no connection */

	if (conn_len == 1) {
		/* single connection */
		err = snd_hdac_read(codec, nid, AC_VERB_GET_CONNECT_LIST, 0,
				    &parm);
		if (err < 0)
			return err;
		if (conn_list)
			conn_list[0] = parm & mask;
		return 1;
	}

	/* multi connection */
	conns = 0;
	prev_nid = 0;
	for (i = 0; i < conn_len; i++) {
		int range_val;
		hda_nid_t val, n;

		if (i % num_elems == 0) {
			err = snd_hdac_read(codec, nid,
					    AC_VERB_GET_CONNECT_LIST, i,
					    &parm);
			if (err < 0)
				return -EIO;
		}
		range_val = !!(parm & (1 << (shift-1))); /* ranges */
		val = parm & mask;
		if (val == 0 && null_count++) {  /* no second chance */
			dev_dbg(&codec->dev,
				"invalid CONNECT_LIST verb %x[%i]:%x\n",
				nid, i, parm);
			return 0;
		}
		parm >>= shift;
		if (range_val) {
			/* ranges between the previous and this one */
			if (!prev_nid || prev_nid >= val) {
				dev_warn(&codec->dev,
					 "invalid dep_range_val %x:%x\n",
					 prev_nid, val);
				continue;
			}
			for (n = prev_nid + 1; n <= val; n++) {
				if (conn_list) {
					if (conns >= max_conns)
						return -ENOSPC;
					conn_list[conns] = n;
				}
				conns++;
			}
		} else {
			if (conn_list) {
				if (conns >= max_conns)
					return -ENOSPC;
				conn_list[conns] = val;
			}
			conns++;
		}
		prev_nid = val;
	}
	return conns;
}
EXPORT_SYMBOL_GPL(snd_hdac_get_connections);

#ifdef CONFIG_PM
/**
 * snd_hdac_power_up - power up the codec
 * @codec: the codec object
 *
 * This function calls the runtime PM helper to power up the given codec.
 * Unlike snd_hdac_power_up_pm(), you should call this only for the code
 * path that isn't included in PM path.  Otherwise it gets stuck.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_up(struct hdac_device *codec)
{
	return pm_runtime_get_sync(&codec->dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up);

/**
 * snd_hdac_power_down - power down the codec
 * @codec: the codec object
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_down(struct hdac_device *codec)
{
	struct device *dev = &codec->dev;

	pm_runtime_mark_last_busy(dev);
	return pm_runtime_put_autosuspend(dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down);

/**
 * snd_hdac_power_up_pm - power up the codec
 * @codec: the codec object
 *
 * This function can be called in a recursive code path like init code
 * which may be called by PM suspend/resume again.  OTOH, if a power-up
 * call must wake up the sleeper (e.g. in a kctl callback), use
 * snd_hdac_power_up() instead.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_up_pm(struct hdac_device *codec)
{
	if (!atomic_inc_not_zero(&codec->in_pm))
		return snd_hdac_power_up(codec);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_power_up_pm);

/**
 * snd_hdac_power_down_pm - power down the codec
 * @codec: the codec object
 *
 * Like snd_hdac_power_up_pm(), this function is used in a recursive
 * code path like init code which may be called by PM suspend/resume again.
 *
 * Returns zero if successful, or a negative error code.
 */
int snd_hdac_power_down_pm(struct hdac_device *codec)
{
	if (atomic_dec_if_positive(&codec->in_pm) < 0)
		return snd_hdac_power_down(codec);
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_power_down_pm);
#endif

/**
 * snd_hdac_link_power - Enable/disable the link power for a codec
 * @codec: the codec object
 * @bool: enable or disable the link power
 */
int snd_hdac_link_power(struct hdac_device *codec, bool enable)
{
	if  (!codec->link_power_control)
		return 0;

	if  (codec->bus->ops->link_power)
		return codec->bus->ops->link_power(codec->bus, enable);
	else
		return -EINVAL;
}
EXPORT_SYMBOL_GPL(snd_hdac_link_power);

/* codec vendor labels */
struct hda_vendor_id {
	unsigned int id;
	const char *name;
};

static struct hda_vendor_id hda_vendor_ids[] = {
	{ 0x1002, "ATI" },
	{ 0x1013, "Cirrus Logic" },
	{ 0x1057, "Motorola" },
	{ 0x1095, "Silicon Image" },
	{ 0x10de, "Nvidia" },
	{ 0x10ec, "Realtek" },
	{ 0x1102, "Creative" },
	{ 0x1106, "VIA" },
	{ 0x111d, "IDT" },
	{ 0x11c1, "LSI" },
	{ 0x11d4, "Analog Devices" },
	{ 0x13f6, "C-Media" },
	{ 0x14f1, "Conexant" },
	{ 0x17e8, "Chrontel" },
	{ 0x1854, "LG" },
	{ 0x1aec, "Wolfson Microelectronics" },
	{ 0x1af4, "QEMU" },
	{ 0x434d, "C-Media" },
	{ 0x8086, "Intel" },
	{ 0x8384, "SigmaTel" },
	{} /* terminator */
};

/* store the codec vendor name */
static int get_codec_vendor_name(struct hdac_device *codec)
{
	const struct hda_vendor_id *c;
	u16 vendor_id = codec->vendor_id >> 16;

	for (c = hda_vendor_ids; c->id; c++) {
		if (c->id == vendor_id) {
			codec->vendor_name = kstrdup(c->name, GFP_KERNEL);
			return codec->vendor_name ? 0 : -ENOMEM;
		}
	}

	codec->vendor_name = kasprintf(GFP_KERNEL, "Generic %04x", vendor_id);
	return codec->vendor_name ? 0 : -ENOMEM;
}

/*
 * stream formats
 */
struct hda_rate_tbl {
	unsigned int hz;
	unsigned int alsa_bits;
	unsigned int hda_fmt;
};

/* rate = base * mult / div */
#define HDA_RATE(base, mult, div) \
	(AC_FMT_BASE_##base##K | (((mult) - 1) << AC_FMT_MULT_SHIFT) | \
	 (((div) - 1) << AC_FMT_DIV_SHIFT))

static struct hda_rate_tbl rate_bits[] = {
	/* rate in Hz, ALSA rate bitmask, HDA format value */

	/* autodetected value used in snd_hda_query_supported_pcm */
	{ 8000, SNDRV_PCM_RATE_8000, HDA_RATE(48, 1, 6) },
	{ 11025, SNDRV_PCM_RATE_11025, HDA_RATE(44, 1, 4) },
	{ 16000, SNDRV_PCM_RATE_16000, HDA_RATE(48, 1, 3) },
	{ 22050, SNDRV_PCM_RATE_22050, HDA_RATE(44, 1, 2) },
	{ 32000, SNDRV_PCM_RATE_32000, HDA_RATE(48, 2, 3) },
	{ 44100, SNDRV_PCM_RATE_44100, HDA_RATE(44, 1, 1) },
	{ 48000, SNDRV_PCM_RATE_48000, HDA_RATE(48, 1, 1) },
	{ 88200, SNDRV_PCM_RATE_88200, HDA_RATE(44, 2, 1) },
	{ 96000, SNDRV_PCM_RATE_96000, HDA_RATE(48, 2, 1) },
	{ 176400, SNDRV_PCM_RATE_176400, HDA_RATE(44, 4, 1) },
	{ 192000, SNDRV_PCM_RATE_192000, HDA_RATE(48, 4, 1) },
#define AC_PAR_PCM_RATE_BITS	11
	/* up to bits 10, 384kHZ isn't supported properly */

	/* not autodetected value */
	{ 9600, SNDRV_PCM_RATE_KNOT, HDA_RATE(48, 1, 5) },

	{ 0 } /* terminator */
};

/**
 * snd_hdac_calc_stream_format - calculate the format bitset
 * @rate: the sample rate
 * @channels: the number of channels
 * @format: the PCM format (SNDRV_PCM_FORMAT_XXX)
 * @maxbps: the max. bps
 * @spdif_ctls: HD-audio SPDIF status bits (0 if irrelevant)
 *
 * Calculate the format bitset from the given rate, channels and th PCM format.
 *
 * Return zero if invalid.
 */
unsigned int snd_hdac_calc_stream_format(unsigned int rate,
					 unsigned int channels,
					 unsigned int format,
					 unsigned int maxbps,
					 unsigned short spdif_ctls)
{
	int i;
	unsigned int val = 0;

	for (i = 0; rate_bits[i].hz; i++)
		if (rate_bits[i].hz == rate) {
			val = rate_bits[i].hda_fmt;
			break;
		}
	if (!rate_bits[i].hz)
		return 0;

	if (channels == 0 || channels > 8)
		return 0;
	val |= channels - 1;

	switch (snd_pcm_format_width(format)) {
	case 8:
		val |= AC_FMT_BITS_8;
		break;
	case 16:
		val |= AC_FMT_BITS_16;
		break;
	case 20:
	case 24:
	case 32:
		if (maxbps >= 32 || format == SNDRV_PCM_FORMAT_FLOAT_LE)
			val |= AC_FMT_BITS_32;
		else if (maxbps >= 24)
			val |= AC_FMT_BITS_24;
		else
			val |= AC_FMT_BITS_20;
		break;
	default:
		return 0;
	}

	if (spdif_ctls & AC_DIG1_NONAUDIO)
		val |= AC_FMT_TYPE_NON_PCM;

	return val;
}
EXPORT_SYMBOL_GPL(snd_hdac_calc_stream_format);

static unsigned int query_pcm_param(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int val = 0;

	if (nid != codec->afg &&
	    (get_wcaps(codec, nid) & AC_WCAP_FORMAT_OVRD))
		val = snd_hdac_read_parm(codec, nid, AC_PAR_PCM);
	if (!val || val == -1)
		val = snd_hdac_read_parm(codec, codec->afg, AC_PAR_PCM);
	if (!val || val == -1)
		return 0;
	return val;
}

static unsigned int query_stream_param(struct hdac_device *codec, hda_nid_t nid)
{
	unsigned int streams = snd_hdac_read_parm(codec, nid, AC_PAR_STREAM);

	if (!streams || streams == -1)
		streams = snd_hdac_read_parm(codec, codec->afg, AC_PAR_STREAM);
	if (!streams || streams == -1)
		return 0;
	return streams;
}

/**
 * snd_hdac_query_supported_pcm - query the supported PCM rates and formats
 * @codec: the codec object
 * @nid: NID to query
 * @ratesp: the pointer to store the detected rate bitflags
 * @formatsp: the pointer to store the detected formats
 * @bpsp: the pointer to store the detected format widths
 *
 * Queries the supported PCM rates and formats.  The NULL @ratesp, @formatsp
 * or @bsps argument is ignored.
 *
 * Returns 0 if successful, otherwise a negative error code.
 */
int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
				 u32 *ratesp, u64 *formatsp, unsigned int *bpsp)
{
	unsigned int i, val, wcaps;

	wcaps = get_wcaps(codec, nid);
	val = query_pcm_param(codec, nid);

	if (ratesp) {
		u32 rates = 0;
		for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++) {
			if (val & (1 << i))
				rates |= rate_bits[i].alsa_bits;
		}
		if (rates == 0) {
			dev_err(&codec->dev,
				"rates == 0 (nid=0x%x, val=0x%x, ovrd=%i)\n",
				nid, val,
				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0);
			return -EIO;
		}
		*ratesp = rates;
	}

	if (formatsp || bpsp) {
		u64 formats = 0;
		unsigned int streams, bps;

		streams = query_stream_param(codec, nid);
		if (!streams)
			return -EIO;

		bps = 0;
		if (streams & AC_SUPFMT_PCM) {
			if (val & AC_SUPPCM_BITS_8) {
				formats |= SNDRV_PCM_FMTBIT_U8;
				bps = 8;
			}
			if (val & AC_SUPPCM_BITS_16) {
				formats |= SNDRV_PCM_FMTBIT_S16_LE;
				bps = 16;
			}
			if (wcaps & AC_WCAP_DIGITAL) {
				if (val & AC_SUPPCM_BITS_32)
					formats |= SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE;
				if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24))
					formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_24)
					bps = 24;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
			} else if (val & (AC_SUPPCM_BITS_20|AC_SUPPCM_BITS_24|
					  AC_SUPPCM_BITS_32)) {
				formats |= SNDRV_PCM_FMTBIT_S32_LE;
				if (val & AC_SUPPCM_BITS_32)
					bps = 32;
				else if (val & AC_SUPPCM_BITS_24)
					bps = 24;
				else if (val & AC_SUPPCM_BITS_20)
					bps = 20;
			}
		}
#if 0 /* FIXME: CS4206 doesn't work, which is the only codec supporting float */
		if (streams & AC_SUPFMT_FLOAT32) {
			formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
			if (!bps)
				bps = 32;
		}
#endif
		if (streams == AC_SUPFMT_AC3) {
			/* should be exclusive */
			/* temporary hack: we have still no proper support
			 * for the direct AC3 stream...
			 */
			formats |= SNDRV_PCM_FMTBIT_U8;
			bps = 8;
		}
		if (formats == 0) {
			dev_err(&codec->dev,
				"formats == 0 (nid=0x%x, val=0x%x, ovrd=%i, streams=0x%x)\n",
				nid, val,
				(wcaps & AC_WCAP_FORMAT_OVRD) ? 1 : 0,
				streams);
			return -EIO;
		}
		if (formatsp)
			*formatsp = formats;
		if (bpsp)
			*bpsp = bps;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_query_supported_pcm);

/**
 * snd_hdac_is_supported_format - Check the validity of the format
 * @codec: the codec object
 * @nid: NID to check
 * @format: the HD-audio format value to check
 *
 * Check whether the given node supports the format value.
 *
 * Returns true if supported, false if not.
 */
bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
				  unsigned int format)
{
	int i;
	unsigned int val = 0, rate, stream;

	val = query_pcm_param(codec, nid);
	if (!val)
		return false;

	rate = format & 0xff00;
	for (i = 0; i < AC_PAR_PCM_RATE_BITS; i++)
		if (rate_bits[i].hda_fmt == rate) {
			if (val & (1 << i))
				break;
			return false;
		}
	if (i >= AC_PAR_PCM_RATE_BITS)
		return false;

	stream = query_stream_param(codec, nid);
	if (!stream)
		return false;

	if (stream & AC_SUPFMT_PCM) {
		switch (format & 0xf0) {
		case 0x00:
			if (!(val & AC_SUPPCM_BITS_8))
				return false;
			break;
		case 0x10:
			if (!(val & AC_SUPPCM_BITS_16))
				return false;
			break;
		case 0x20:
			if (!(val & AC_SUPPCM_BITS_20))
				return false;
			break;
		case 0x30:
			if (!(val & AC_SUPPCM_BITS_24))
				return false;
			break;
		case 0x40:
			if (!(val & AC_SUPPCM_BITS_32))
				return false;
			break;
		default:
			return false;
		}
	} else {
		/* FIXME: check for float32 and AC3? */
	}

	return true;
}
EXPORT_SYMBOL_GPL(snd_hdac_is_supported_format);

static unsigned int codec_read(struct hdac_device *hdac, hda_nid_t nid,
			int flags, unsigned int verb, unsigned int parm)
{
	unsigned int cmd = snd_hdac_make_cmd(hdac, nid, verb, parm);
	unsigned int res;

	if (snd_hdac_exec_verb(hdac, cmd, flags, &res))
		return -1;

	return res;
}

static int codec_write(struct hdac_device *hdac, hda_nid_t nid,
			int flags, unsigned int verb, unsigned int parm)
{
	unsigned int cmd = snd_hdac_make_cmd(hdac, nid, verb, parm);

	return snd_hdac_exec_verb(hdac, cmd, flags, NULL);
}

/**
 * snd_hdac_codec_read - send a command and get the response
 * @hdac: the HDAC device
 * @nid: NID to send the command
 * @flags: optional bit flags
 * @verb: the verb to send
 * @parm: the parameter for the verb
 *
 * Send a single command and read the corresponding response.
 *
 * Returns the obtained response value, or -1 for an error.
 */
int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
			int flags, unsigned int verb, unsigned int parm)
{
	return codec_read(hdac, nid, flags, verb, parm);
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_read);

/**
 * snd_hdac_codec_write - send a single command without waiting for response
 * @hdac: the HDAC device
 * @nid: NID to send the command
 * @flags: optional bit flags
 * @verb: the verb to send
 * @parm: the parameter for the verb
 *
 * Send a single command without waiting for response.
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
			int flags, unsigned int verb, unsigned int parm)
{
	return codec_write(hdac, nid, flags, verb, parm);
}
EXPORT_SYMBOL_GPL(snd_hdac_codec_write);

/**
 * snd_hdac_check_power_state - check whether the actual power state matches
 * with the target state
 *
 * @hdac: the HDAC device
 * @nid: NID to send the command
 * @target_state: target state to check for
 *
 * Return true if state matches, false if not
 */
bool snd_hdac_check_power_state(struct hdac_device *hdac,
		hda_nid_t nid, unsigned int target_state)
{
	unsigned int state = codec_read(hdac, nid, 0,
				AC_VERB_GET_POWER_STATE, 0);

	if (state & AC_PWRST_ERROR)
		return true;
	state = (state >> 4) & 0x0f;
	return (state == target_state);
}
EXPORT_SYMBOL_GPL(snd_hdac_check_power_state);