sound/pci/hda/hda_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sysfs interface for HD-audio codec
   4  *
   5  * Copyright (c) 2014 Takashi Iwai <tiwai@suse.de>
   6  *
   7  * split from hda_hwdep.c
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/compat.h>
  13 #include <linux/mutex.h>
  14 #include <linux/ctype.h>
  15 #include <linux/string.h>
  16 #include <linux/export.h>
  17 #include <sound/core.h>
  18 #include <sound/hda_codec.h>
  19 #include "hda_local.h"
  20 #include <sound/hda_hwdep.h>
  21 #include <sound/minors.h>
  22
  23 /* hint string pair */
  24 struct hda_hint {
  25         const char *key;
  26         const char *val;        /* contained in the same alloc as key */
  27 };
  28
  29 #ifdef CONFIG_PM
  30 static ssize_t power_on_acct_show(struct device *dev,
  31                                   struct device_attribute *attr,
  32                                   char *buf)
  33 {
  34         struct hda_codec *codec = dev_get_drvdata(dev);
  35         snd_hda_update_power_acct(codec);
  36         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
  37 }
  38
  39 static ssize_t power_off_acct_show(struct device *dev,
  40                                    struct device_attribute *attr,
  41                                    char *buf)
  42 {
  43         struct hda_codec *codec = dev_get_drvdata(dev);
  44         snd_hda_update_power_acct(codec);
  45         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
  46 }
  47
  48 static DEVICE_ATTR_RO(power_on_acct);
  49 static DEVICE_ATTR_RO(power_off_acct);
  50 #endif /* CONFIG_PM */
  51
  52 #define CODEC_INFO_SHOW(type, field)                            \
  53 static ssize_t type##_show(struct device *dev,                  \
  54                            struct device_attribute *attr,       \
  55                            char *buf)                           \
  56 {                                                               \
  57         struct hda_codec *codec = dev_get_drvdata(dev);         \
  58         return sprintf(buf, "0x%x\n", codec->field);            \
  59 }
  60
  61 #define CODEC_INFO_STR_SHOW(type, field)                        \
  62 static ssize_t type##_show(struct device *dev,                  \
  63                              struct device_attribute *attr,     \
  64                                         char *buf)              \
  65 {                                                               \
  66         struct hda_codec *codec = dev_get_drvdata(dev);         \
  67         return sprintf(buf, "%s\n",                             \
  68                        codec->field ? codec->field : "");       \
  69 }
  70
  71 CODEC_INFO_SHOW(vendor_id, core.vendor_id);
  72 CODEC_INFO_SHOW(subsystem_id, core.subsystem_id);
  73 CODEC_INFO_SHOW(revision_id, core.revision_id);
  74 CODEC_INFO_SHOW(afg, core.afg);
  75 CODEC_INFO_SHOW(mfg, core.mfg);
  76 CODEC_INFO_STR_SHOW(vendor_name, core.vendor_name);
  77 CODEC_INFO_STR_SHOW(chip_name, core.chip_name);
  78 CODEC_INFO_STR_SHOW(modelname, modelname);
  79
  80 static ssize_t pin_configs_show(struct hda_codec *codec,
  81                                 struct snd_array *list,
  82                                 char *buf)
  83 {
  84         const struct hda_pincfg *pin;
  85         int i, len = 0;
  86         mutex_lock(&codec->user_mutex);
  87         snd_array_for_each(list, i, pin) {
  88                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
  89                                pin->nid, pin->cfg);
  90         }
  91         mutex_unlock(&codec->user_mutex);
  92         return len;
  93 }
  94
  95 static ssize_t init_pin_configs_show(struct device *dev,
  96                                      struct device_attribute *attr,
  97                                      char *buf)
  98 {
  99         struct hda_codec *codec = dev_get_drvdata(dev);
 100         return pin_configs_show(codec, &codec->init_pins, buf);
 101 }
 102
 103 static ssize_t driver_pin_configs_show(struct device *dev,
 104                                        struct device_attribute *attr,
 105                                        char *buf)
 106 {
 107         struct hda_codec *codec = dev_get_drvdata(dev);
 108         return pin_configs_show(codec, &codec->driver_pins, buf);
 109 }
 110
 111 #ifdef CONFIG_SND_HDA_RECONFIG
 112
 113 /*
 114  * sysfs interface
 115  */
 116
 117 static int clear_codec(struct hda_codec *codec)
 118 {
 119         int err;
 120
 121         err = snd_hda_codec_reset(codec);
 122         if (err < 0) {
 123                 codec_err(codec, "The codec is being used, can't free.\n");
 124                 return err;
 125         }
 126         snd_hda_sysfs_clear(codec);
 127         return 0;
 128 }
 129
 130 static int reconfig_codec(struct hda_codec *codec)
 131 {
 132         int err;
 133
 134         snd_hda_power_up(codec);
 135         codec_info(codec, "hda-codec: reconfiguring\n");
 136         err = snd_hda_codec_reset(codec);
 137         if (err < 0) {
 138                 codec_err(codec,
 139                            "The codec is being used, can't reconfigure.\n");
 140                 goto error;
 141         }
 142         err = snd_hda_codec_configure(codec);
 143         if (err < 0)
 144                 goto error;
 145         err = snd_card_register(codec->card);
 146  error:
 147         snd_hda_power_down(codec);
 148         return err;
 149 }
 150
 151 /*
 152  * allocate a string at most len chars, and remove the trailing EOL
 153  */
 154 static char *kstrndup_noeol(const char *src, size_t len)
 155 {
 156         char *s = kstrndup(src, len, GFP_KERNEL);
 157         char *p;
 158         if (!s)
 159                 return NULL;
 160         p = strchr(s, '\n');
 161         if (p)
 162                 *p = 0;
 163         return s;
 164 }
 165
 166 #define CODEC_INFO_STORE(type, field)                           \
 167 static ssize_t type##_store(struct device *dev,                 \
 168                             struct device_attribute *attr,      \
 169                             const char *buf, size_t count)      \
 170 {                                                               \
 171         struct hda_codec *codec = dev_get_drvdata(dev);         \
 172         unsigned long val;                                      \
 173         int err = kstrtoul(buf, 0, &val);                       \
 174         if (err < 0)                                            \
 175                 return err;                                     \
 176         codec->field = val;                                     \
 177         return count;                                           \
 178 }
 179
 180 #define CODEC_INFO_STR_STORE(type, field)                       \
 181 static ssize_t type##_store(struct device *dev,                 \
 182                             struct device_attribute *attr,      \
 183                             const char *buf, size_t count)      \
 184 {                                                               \
 185         struct hda_codec *codec = dev_get_drvdata(dev);         \
 186         char *s = kstrndup_noeol(buf, 64);                      \
 187         if (!s)                                                 \
 188                 return -ENOMEM;                                 \
 189         kfree(codec->field);                                    \
 190         codec->field = s;                                       \
 191         return count;                                           \
 192 }
 193
 194 CODEC_INFO_STORE(vendor_id, core.vendor_id);
 195 CODEC_INFO_STORE(subsystem_id, core.subsystem_id);
 196 CODEC_INFO_STORE(revision_id, core.revision_id);
 197 CODEC_INFO_STR_STORE(vendor_name, core.vendor_name);
 198 CODEC_INFO_STR_STORE(chip_name, core.chip_name);
 199 CODEC_INFO_STR_STORE(modelname, modelname);
 200
 201 #define CODEC_ACTION_STORE(type)                                \
 202 static ssize_t type##_store(struct device *dev,                 \
 203                             struct device_attribute *attr,      \
 204                             const char *buf, size_t count)      \
 205 {                                                               \
 206         struct hda_codec *codec = dev_get_drvdata(dev);         \
 207         int err = 0;                                            \
 208         if (*buf)                                               \
 209                 err = type##_codec(codec);                      \
 210         return err < 0 ? err : count;                           \
 211 }
 212
 213 CODEC_ACTION_STORE(reconfig);
 214 CODEC_ACTION_STORE(clear);
 215
 216 static ssize_t init_verbs_show(struct device *dev,
 217                                struct device_attribute *attr,
 218                                char *buf)
 219 {
 220         struct hda_codec *codec = dev_get_drvdata(dev);
 221         const struct hda_verb *v;
 222         int i, len = 0;
 223         mutex_lock(&codec->user_mutex);
 224         snd_array_for_each(&codec->init_verbs, i, v) {
 225                 len += snprintf(buf + len, PAGE_SIZE - len,
 226                                 "0x%02x 0x%03x 0x%04x\n",
 227                                 v->nid, v->verb, v->param);
 228         }
 229         mutex_unlock(&codec->user_mutex);
 230         return len;
 231 }
 232
 233 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 234 {
 235         struct hda_verb *v;
 236         int nid, verb, param;
 237
 238         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 239                 return -EINVAL;
 240         if (!nid || !verb)
 241                 return -EINVAL;
 242         mutex_lock(&codec->user_mutex);
 243         v = snd_array_new(&codec->init_verbs);
 244         if (!v) {
 245                 mutex_unlock(&codec->user_mutex);
 246                 return -ENOMEM;
 247         }
 248         v->nid = nid;
 249         v->verb = verb;
 250         v->param = param;
 251         mutex_unlock(&codec->user_mutex);
 252         return 0;
 253 }
 254
 255 static ssize_t init_verbs_store(struct device *dev,
 256                                 struct device_attribute *attr,
 257                                 const char *buf, size_t count)
 258 {
 259         struct hda_codec *codec = dev_get_drvdata(dev);
 260         int err = parse_init_verbs(codec, buf);
 261         if (err < 0)
 262                 return err;
 263         return count;
 264 }
 265
 266 static ssize_t hints_show(struct device *dev,
 267                           struct device_attribute *attr,
 268                           char *buf)
 269 {
 270         struct hda_codec *codec = dev_get_drvdata(dev);
 271         const struct hda_hint *hint;
 272         int i, len = 0;
 273         mutex_lock(&codec->user_mutex);
 274         snd_array_for_each(&codec->hints, i, hint) {
 275                 len += snprintf(buf + len, PAGE_SIZE - len,
 276                                 "%s = %s\n", hint->key, hint->val);
 277         }
 278         mutex_unlock(&codec->user_mutex);
 279         return len;
 280 }
 281
 282 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 283 {
 284         struct hda_hint *hint;
 285         int i;
 286
 287         snd_array_for_each(&codec->hints, i, hint) {
 288                 if (!strcmp(hint->key, key))
 289                         return hint;
 290         }
 291         return NULL;
 292 }
 293
 294 static void remove_trail_spaces(char *str)
 295 {
 296         char *p;
 297         if (!*str)
 298                 return;
 299         p = str + strlen(str) - 1;
 300         for (; isspace(*p); p--) {
 301                 *p = 0;
 302                 if (p == str)
 303                         return;
 304         }
 305 }
 306
 307 #define MAX_HINTS       1024
 308
 309 static int parse_hints(struct hda_codec *codec, const char *buf)
 310 {
 311         char *key, *val;
 312         struct hda_hint *hint;
 313         int err = 0;
 314
 315         buf = skip_spaces(buf);
 316         if (!*buf || *buf == '#' || *buf == '\n')
 317                 return 0;
 318         if (*buf == '=')
 319                 return -EINVAL;
 320         key = kstrndup_noeol(buf, 1024);
 321         if (!key)
 322                 return -ENOMEM;
 323         /* extract key and val */
 324         val = strchr(key, '=');
 325         if (!val) {
 326                 kfree(key);
 327                 return -EINVAL;
 328         }
 329         *val++ = 0;
 330         val = skip_spaces(val);
 331         remove_trail_spaces(key);
 332         remove_trail_spaces(val);
 333         mutex_lock(&codec->user_mutex);
 334         hint = get_hint(codec, key);
 335         if (hint) {
 336                 /* replace */
 337                 kfree(hint->key);
 338                 hint->key = key;
 339                 hint->val = val;
 340                 goto unlock;
 341         }
 342         /* allocate a new hint entry */
 343         if (codec->hints.used >= MAX_HINTS)
 344                 hint = NULL;
 345         else
 346                 hint = snd_array_new(&codec->hints);
 347         if (hint) {
 348                 hint->key = key;
 349                 hint->val = val;
 350         } else {
 351                 err = -ENOMEM;
 352         }
 353  unlock:
 354         mutex_unlock(&codec->user_mutex);
 355         if (err)
 356                 kfree(key);
 357         return err;
 358 }
 359
 360 static ssize_t hints_store(struct device *dev,
 361                            struct device_attribute *attr,
 362                            const char *buf, size_t count)
 363 {
 364         struct hda_codec *codec = dev_get_drvdata(dev);
 365         int err = parse_hints(codec, buf);
 366         if (err < 0)
 367                 return err;
 368         return count;
 369 }
 370
 371 static ssize_t user_pin_configs_show(struct device *dev,
 372                                      struct device_attribute *attr,
 373                                      char *buf)
 374 {
 375         struct hda_codec *codec = dev_get_drvdata(dev);
 376         return pin_configs_show(codec, &codec->user_pins, buf);
 377 }
 378
 379 #define MAX_PIN_CONFIGS         32
 380
 381 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 382 {
 383         int nid, cfg, err;
 384
 385         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 386                 return -EINVAL;
 387         if (!nid)
 388                 return -EINVAL;
 389         mutex_lock(&codec->user_mutex);
 390         err = snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 391         mutex_unlock(&codec->user_mutex);
 392         return err;
 393 }
 394
 395 static ssize_t user_pin_configs_store(struct device *dev,
 396                                       struct device_attribute *attr,
 397                                       const char *buf, size_t count)
 398 {
 399         struct hda_codec *codec = dev_get_drvdata(dev);
 400         int err = parse_user_pin_configs(codec, buf);
 401         if (err < 0)
 402                 return err;
 403         return count;
 404 }
 405
 406 /* sysfs attributes exposed only when CONFIG_SND_HDA_RECONFIG=y */
 407 static DEVICE_ATTR_RW(init_verbs);
 408 static DEVICE_ATTR_RW(hints);
 409 static DEVICE_ATTR_RW(user_pin_configs);
 410 static DEVICE_ATTR_WO(reconfig);
 411 static DEVICE_ATTR_WO(clear);
 412
 413 /**
 414  * snd_hda_get_hint - Look for hint string
 415  * @codec: the HDA codec
 416  * @key: the hint key string
 417  *
 418  * Look for a hint key/value pair matching with the given key string
 419  * and returns the value string.  If nothing found, returns NULL.
 420  */
 421 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 422 {
 423         struct hda_hint *hint = get_hint(codec, key);
 424         return hint ? hint->val : NULL;
 425 }
 426 EXPORT_SYMBOL_GPL(snd_hda_get_hint);
 427
 428 /**
 429  * snd_hda_get_bool_hint - Get a boolean hint value
 430  * @codec: the HDA codec
 431  * @key: the hint key string
 432  *
 433  * Look for a hint key/value pair matching with the given key string
 434  * and returns a boolean value parsed from the value.  If no matching
 435  * key is found, return a negative value.
 436  */
 437 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 438 {
 439         const char *p;
 440         int ret;
 441
 442         mutex_lock(&codec->user_mutex);
 443         p = snd_hda_get_hint(codec, key);
 444         if (!p || !*p)
 445                 ret = -ENOENT;
 446         else {
 447                 switch (toupper(*p)) {
 448                 case 'T': /* true */
 449                 case 'Y': /* yes */
 450                 case '1':
 451                         ret = 1;
 452                         break;
 453                 default:
 454                         ret = 0;
 455                         break;
 456                 }
 457         }
 458         mutex_unlock(&codec->user_mutex);
 459         return ret;
 460 }
 461 EXPORT_SYMBOL_GPL(snd_hda_get_bool_hint);
 462
 463 /**
 464  * snd_hda_get_int_hint - Get an integer hint value
 465  * @codec: the HDA codec
 466  * @key: the hint key string
 467  * @valp: pointer to store a value
 468  *
 469  * Look for a hint key/value pair matching with the given key string
 470  * and stores the integer value to @valp.  If no matching key is found,
 471  * return a negative error code.  Otherwise it returns zero.
 472  */
 473 int snd_hda_get_int_hint(struct hda_codec *codec, const char *key, int *valp)
 474 {
 475         const char *p;
 476         unsigned long val;
 477         int ret;
 478
 479         mutex_lock(&codec->user_mutex);
 480         p = snd_hda_get_hint(codec, key);
 481         if (!p)
 482                 ret = -ENOENT;
 483         else if (kstrtoul(p, 0, &val))
 484                 ret = -EINVAL;
 485         else {
 486                 *valp = val;
 487                 ret = 0;
 488         }
 489         mutex_unlock(&codec->user_mutex);
 490         return ret;
 491 }
 492 EXPORT_SYMBOL_GPL(snd_hda_get_int_hint);
 493 #endif /* CONFIG_SND_HDA_RECONFIG */
 494
 495 /*
 496  * common sysfs attributes
 497  */
 498 #ifdef CONFIG_SND_HDA_RECONFIG
 499 #define RECONFIG_DEVICE_ATTR(name)      DEVICE_ATTR_RW(name)
 500 #else
 501 #define RECONFIG_DEVICE_ATTR(name)      DEVICE_ATTR_RO(name)
 502 #endif
 503 static RECONFIG_DEVICE_ATTR(vendor_id);
 504 static RECONFIG_DEVICE_ATTR(subsystem_id);
 505 static RECONFIG_DEVICE_ATTR(revision_id);
 506 static DEVICE_ATTR_RO(afg);
 507 static DEVICE_ATTR_RO(mfg);
 508 static RECONFIG_DEVICE_ATTR(vendor_name);
 509 static RECONFIG_DEVICE_ATTR(chip_name);
 510 static RECONFIG_DEVICE_ATTR(modelname);
 511 static DEVICE_ATTR_RO(init_pin_configs);
 512 static DEVICE_ATTR_RO(driver_pin_configs);
 513
 514
 515 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 516
 517 /* parser mode */
 518 enum {
 519         LINE_MODE_NONE,
 520         LINE_MODE_CODEC,
 521         LINE_MODE_MODEL,
 522         LINE_MODE_PINCFG,
 523         LINE_MODE_VERB,
 524         LINE_MODE_HINT,
 525         LINE_MODE_VENDOR_ID,
 526         LINE_MODE_SUBSYSTEM_ID,
 527         LINE_MODE_REVISION_ID,
 528         LINE_MODE_CHIP_NAME,
 529         NUM_LINE_MODES,
 530 };
 531
 532 static inline int strmatch(const char *a, const char *b)
 533 {
 534         return strncasecmp(a, b, strlen(b)) == 0;
 535 }
 536
 537 /* parse the contents after the line "[codec]"
 538  * accept only the line with three numbers, and assign the current codec
 539  */
 540 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 541                              struct hda_codec **codecp)
 542 {
 543         int vendorid, subid, caddr;
 544         struct hda_codec *codec;
 545
 546         *codecp = NULL;
 547         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 548                 list_for_each_codec(codec, bus) {
 549                         if ((vendorid <= 0 || codec->core.vendor_id == vendorid) &&
 550                             (subid <= 0 || codec->core.subsystem_id == subid) &&
 551                             codec->core.addr == caddr) {
 552                                 *codecp = codec;
 553                                 break;
 554                         }
 555                 }
 556         }
 557 }
 558
 559 /* parse the contents after the other command tags, [pincfg], [verb],
 560  * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
 561  * just pass to the sysfs helper (only when any codec was specified)
 562  */
 563 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 564                               struct hda_codec **codecp)
 565 {
 566         parse_user_pin_configs(*codecp, buf);
 567 }
 568
 569 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 570                             struct hda_codec **codecp)
 571 {
 572         parse_init_verbs(*codecp, buf);
 573 }
 574
 575 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 576                             struct hda_codec **codecp)
 577 {
 578         parse_hints(*codecp, buf);
 579 }
 580
 581 static void parse_model_mode(char *buf, struct hda_bus *bus,
 582                              struct hda_codec **codecp)
 583 {
 584         kfree((*codecp)->modelname);
 585         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 586 }
 587
 588 static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
 589                                  struct hda_codec **codecp)
 590 {
 591         snd_hda_codec_set_name(*codecp, buf);
 592 }
 593
 594 #define DEFINE_PARSE_ID_MODE(name) \
 595 static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
 596                                  struct hda_codec **codecp) \
 597 { \
 598         unsigned long val; \
 599         if (!kstrtoul(buf, 0, &val)) \
 600                 (*codecp)->core.name = val; \
 601 }
 602
 603 DEFINE_PARSE_ID_MODE(vendor_id);
 604 DEFINE_PARSE_ID_MODE(subsystem_id);
 605 DEFINE_PARSE_ID_MODE(revision_id);
 606
 607
 608 struct hda_patch_item {
 609         const char *tag;
 610         const char *alias;
 611         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 612 };
 613
 614 static const struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 615         [LINE_MODE_CODEC] = {
 616                 .tag = "[codec]",
 617                 .parser = parse_codec_mode,
 618         },
 619         [LINE_MODE_MODEL] = {
 620                 .tag = "[model]",
 621                 .parser = parse_model_mode,
 622         },
 623         [LINE_MODE_VERB] = {
 624                 .tag = "[verb]",
 625                 .alias = "[init_verbs]",
 626                 .parser = parse_verb_mode,
 627         },
 628         [LINE_MODE_PINCFG] = {
 629                 .tag = "[pincfg]",
 630                 .alias = "[user_pin_configs]",
 631                 .parser = parse_pincfg_mode,
 632         },
 633         [LINE_MODE_HINT] = {
 634                 .tag = "[hint]",
 635                 .alias = "[hints]",
 636                 .parser = parse_hint_mode
 637         },
 638         [LINE_MODE_VENDOR_ID] = {
 639                 .tag = "[vendor_id]",
 640                 .parser = parse_vendor_id_mode,
 641         },
 642         [LINE_MODE_SUBSYSTEM_ID] = {
 643                 .tag = "[subsystem_id]",
 644                 .parser = parse_subsystem_id_mode,
 645         },
 646         [LINE_MODE_REVISION_ID] = {
 647                 .tag = "[revision_id]",
 648                 .parser = parse_revision_id_mode,
 649         },
 650         [LINE_MODE_CHIP_NAME] = {
 651                 .tag = "[chip_name]",
 652                 .parser = parse_chip_name_mode,
 653         },
 654 };
 655
 656 /* check the line starting with '[' -- change the parser mode accodingly */
 657 static int parse_line_mode(char *buf, struct hda_bus *bus)
 658 {
 659         int i;
 660         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 661                 if (!patch_items[i].tag)
 662                         continue;
 663                 if (strmatch(buf, patch_items[i].tag))
 664                         return i;
 665                 if (patch_items[i].alias && strmatch(buf, patch_items[i].alias))
 666                         return i;
 667         }
 668         return LINE_MODE_NONE;
 669 }
 670
 671 /* copy one line from the buffer in fw, and update the fields in fw
 672  * return zero if it reaches to the end of the buffer, or non-zero
 673  * if successfully copied a line
 674  *
 675  * the spaces at the beginning and the end of the line are stripped
 676  */
 677 static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
 678                             const void **fw_data_p)
 679 {
 680         int len;
 681         size_t fw_size = *fw_size_p;
 682         const char *p = *fw_data_p;
 683
 684         while (isspace(*p) && fw_size) {
 685                 p++;
 686                 fw_size--;
 687         }
 688         if (!fw_size)
 689                 return 0;
 690
 691         for (len = 0; len < fw_size; len++) {
 692                 if (!*p)
 693                         break;
 694                 if (*p == '\n') {
 695                         p++;
 696                         len++;
 697                         break;
 698                 }
 699                 if (len < size)
 700                         *buf++ = *p++;
 701         }
 702         *buf = 0;
 703         *fw_size_p = fw_size - len;
 704         *fw_data_p = p;
 705         remove_trail_spaces(buf);
 706         return 1;
 707 }
 708
 709 /**
 710  * snd_hda_load_patch - load a "patch" firmware file and parse it
 711  * @bus: HD-audio bus
 712  * @fw_size: the firmware byte size
 713  * @fw_buf: the firmware data
 714  */
 715 int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
 716 {
 717         char buf[128];
 718         struct hda_codec *codec;
 719         int line_mode;
 720
 721         line_mode = LINE_MODE_NONE;
 722         codec = NULL;
 723         while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
 724                 if (!*buf || *buf == '#' || *buf == '\n')
 725                         continue;
 726                 if (*buf == '[')
 727                         line_mode = parse_line_mode(buf, bus);
 728                 else if (patch_items[line_mode].parser &&
 729                          (codec || line_mode <= LINE_MODE_CODEC))
 730                         patch_items[line_mode].parser(buf, bus, &codec);
 731         }
 732         return 0;
 733 }
 734 EXPORT_SYMBOL_GPL(snd_hda_load_patch);
 735 #endif /* CONFIG_SND_HDA_PATCH_LOADER */
 736
 737 /*
 738  * sysfs entries
 739  */
 740 static struct attribute *hda_dev_attrs[] = {
 741         &dev_attr_vendor_id.attr,
 742         &dev_attr_subsystem_id.attr,
 743         &dev_attr_revision_id.attr,
 744         &dev_attr_afg.attr,
 745         &dev_attr_mfg.attr,
 746         &dev_attr_vendor_name.attr,
 747         &dev_attr_chip_name.attr,
 748         &dev_attr_modelname.attr,
 749         &dev_attr_init_pin_configs.attr,
 750         &dev_attr_driver_pin_configs.attr,
 751 #ifdef CONFIG_PM
 752         &dev_attr_power_on_acct.attr,
 753         &dev_attr_power_off_acct.attr,
 754 #endif
 755 #ifdef CONFIG_SND_HDA_RECONFIG
 756         &dev_attr_init_verbs.attr,
 757         &dev_attr_hints.attr,
 758         &dev_attr_user_pin_configs.attr,
 759         &dev_attr_reconfig.attr,
 760         &dev_attr_clear.attr,
 761 #endif
 762         NULL
 763 };
 764
 765 static const struct attribute_group hda_dev_attr_group = {
 766         .attrs  = hda_dev_attrs,
 767 };
 768
 769 const struct attribute_group *snd_hda_dev_attr_groups[] = {
 770         &hda_dev_attr_group,
 771         NULL
 772 };
 773
 774 void snd_hda_sysfs_init(struct hda_codec *codec)
 775 {
 776         mutex_init(&codec->user_mutex);
 777 #ifdef CONFIG_SND_HDA_RECONFIG
 778         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 779         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 780         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 781 #endif
 782 }
 783
 784 void snd_hda_sysfs_clear(struct hda_codec *codec)
 785 {
 786 #ifdef CONFIG_SND_HDA_RECONFIG
 787         struct hda_hint *hint;
 788         int i;
 789
 790         /* clear init verbs */
 791         snd_array_free(&codec->init_verbs);
 792         /* clear hints */
 793         snd_array_for_each(&codec->hints, i, hint) {
 794                 kfree(hint->key); /* we don't need to free hint->val */
 795         }
 796         snd_array_free(&codec->hints);
 797         snd_array_free(&codec->user_pins);
 798 #endif
 799 }