sound/pci/hda/hda_sysfs.c

   1 /*
   2  * sysfs interface for HD-audio codec
   3  *
   4  * Copyright (c) 2014 Takashi Iwai <tiwai@suse.de>
   5  *
   6  * split from hda_hwdep.c
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/compat.h>
  12 #include <linux/mutex.h>
  13 #include <linux/ctype.h>
  14 #include <linux/string.h>
  15 #include <linux/export.h>
  16 #include <sound/core.h>
  17 #include "hda_codec.h"
  18 #include "hda_local.h"
  19 #include <sound/hda_hwdep.h>
  20 #include <sound/minors.h>
  21
  22 /* hint string pair */
  23 struct hda_hint {
  24         const char *key;
  25         const char *val;        /* contained in the same alloc as key */
  26 };
  27
  28 #ifdef CONFIG_PM
  29 static ssize_t power_on_acct_show(struct device *dev,
  30                                   struct device_attribute *attr,
  31                                   char *buf)
  32 {
  33         struct hda_codec *codec = dev_get_drvdata(dev);
  34         snd_hda_update_power_acct(codec);
  35         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
  36 }
  37
  38 static ssize_t power_off_acct_show(struct device *dev,
  39                                    struct device_attribute *attr,
  40                                    char *buf)
  41 {
  42         struct hda_codec *codec = dev_get_drvdata(dev);
  43         snd_hda_update_power_acct(codec);
  44         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
  45 }
  46
  47 static DEVICE_ATTR_RO(power_on_acct);
  48 static DEVICE_ATTR_RO(power_off_acct);
  49 #endif /* CONFIG_PM */
  50
  51 #define CODEC_INFO_SHOW(type, field)                            \
  52 static ssize_t type##_show(struct device *dev,                  \
  53                            struct device_attribute *attr,       \
  54                            char *buf)                           \
  55 {                                                               \
  56         struct hda_codec *codec = dev_get_drvdata(dev);         \
  57         return sprintf(buf, "0x%x\n", codec->field);            \
  58 }
  59
  60 #define CODEC_INFO_STR_SHOW(type, field)                        \
  61 static ssize_t type##_show(struct device *dev,                  \
  62                              struct device_attribute *attr,     \
  63                                         char *buf)              \
  64 {                                                               \
  65         struct hda_codec *codec = dev_get_drvdata(dev);         \
  66         return sprintf(buf, "%s\n",                             \
  67                        codec->field ? codec->field : "");       \
  68 }
  69
  70 CODEC_INFO_SHOW(vendor_id, core.vendor_id);
  71 CODEC_INFO_SHOW(subsystem_id, core.subsystem_id);
  72 CODEC_INFO_SHOW(revision_id, core.revision_id);
  73 CODEC_INFO_SHOW(afg, core.afg);
  74 CODEC_INFO_SHOW(mfg, core.mfg);
  75 CODEC_INFO_STR_SHOW(vendor_name, core.vendor_name);
  76 CODEC_INFO_STR_SHOW(chip_name, core.chip_name);
  77 CODEC_INFO_STR_SHOW(modelname, modelname);
  78
  79 static ssize_t pin_configs_show(struct hda_codec *codec,
  80                                 struct snd_array *list,
  81                                 char *buf)
  82 {
  83         int i, len = 0;
  84         mutex_lock(&codec->user_mutex);
  85         for (i = 0; i < list->used; i++) {
  86                 struct hda_pincfg *pin = snd_array_elem(list, i);
  87                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
  88                                pin->nid, pin->cfg);
  89         }
  90         mutex_unlock(&codec->user_mutex);
  91         return len;
  92 }
  93
  94 static ssize_t init_pin_configs_show(struct device *dev,
  95                                      struct device_attribute *attr,
  96                                      char *buf)
  97 {
  98         struct hda_codec *codec = dev_get_drvdata(dev);
  99         return pin_configs_show(codec, &codec->init_pins, buf);
 100 }
 101
 102 static ssize_t driver_pin_configs_show(struct device *dev,
 103                                        struct device_attribute *attr,
 104                                        char *buf)
 105 {
 106         struct hda_codec *codec = dev_get_drvdata(dev);
 107         return pin_configs_show(codec, &codec->driver_pins, buf);
 108 }
 109
 110 #ifdef CONFIG_SND_HDA_RECONFIG
 111
 112 /*
 113  * sysfs interface
 114  */
 115
 116 static int clear_codec(struct hda_codec *codec)
 117 {
 118         int err;
 119
 120         err = snd_hda_codec_reset(codec);
 121         if (err < 0) {
 122                 codec_err(codec, "The codec is being used, can't free.\n");
 123                 return err;
 124         }
 125         snd_hda_sysfs_clear(codec);
 126         return 0;
 127 }
 128
 129 static int reconfig_codec(struct hda_codec *codec)
 130 {
 131         int err;
 132
 133         snd_hda_power_up(codec);
 134         codec_info(codec, "hda-codec: reconfiguring\n");
 135         err = snd_hda_codec_reset(codec);
 136         if (err < 0) {
 137                 codec_err(codec,
 138                            "The codec is being used, can't reconfigure.\n");
 139                 goto error;
 140         }
 141         err = snd_hda_codec_configure(codec);
 142         if (err < 0)
 143                 goto error;
 144         /* rebuild PCMs */
 145         err = snd_hda_codec_build_pcms(codec);
 146         if (err < 0)
 147                 goto error;
 148         /* rebuild mixers */
 149         err = snd_hda_codec_build_controls(codec);
 150         if (err < 0)
 151                 goto error;
 152         err = snd_card_register(codec->card);
 153  error:
 154         snd_hda_power_down(codec);
 155         return err;
 156 }
 157
 158 /*
 159  * allocate a string at most len chars, and remove the trailing EOL
 160  */
 161 static char *kstrndup_noeol(const char *src, size_t len)
 162 {
 163         char *s = kstrndup(src, len, GFP_KERNEL);
 164         char *p;
 165         if (!s)
 166                 return NULL;
 167         p = strchr(s, '\n');
 168         if (p)
 169                 *p = 0;
 170         return s;
 171 }
 172
 173 #define CODEC_INFO_STORE(type, field)                           \
 174 static ssize_t type##_store(struct device *dev,                 \
 175                             struct device_attribute *attr,      \
 176                             const char *buf, size_t count)      \
 177 {                                                               \
 178         struct hda_codec *codec = dev_get_drvdata(dev);         \
 179         unsigned long val;                                      \
 180         int err = kstrtoul(buf, 0, &val);                       \
 181         if (err < 0)                                            \
 182                 return err;                                     \
 183         codec->field = val;                                     \
 184         return count;                                           \
 185 }
 186
 187 #define CODEC_INFO_STR_STORE(type, field)                       \
 188 static ssize_t type##_store(struct device *dev,                 \
 189                             struct device_attribute *attr,      \
 190                             const char *buf, size_t count)      \
 191 {                                                               \
 192         struct hda_codec *codec = dev_get_drvdata(dev);         \
 193         char *s = kstrndup_noeol(buf, 64);                      \
 194         if (!s)                                                 \
 195                 return -ENOMEM;                                 \
 196         kfree(codec->field);                                    \
 197         codec->field = s;                                       \
 198         return count;                                           \
 199 }
 200
 201 CODEC_INFO_STORE(vendor_id, core.vendor_id);
 202 CODEC_INFO_STORE(subsystem_id, core.subsystem_id);
 203 CODEC_INFO_STORE(revision_id, core.revision_id);
 204 CODEC_INFO_STR_STORE(vendor_name, core.vendor_name);
 205 CODEC_INFO_STR_STORE(chip_name, core.chip_name);
 206 CODEC_INFO_STR_STORE(modelname, modelname);
 207
 208 #define CODEC_ACTION_STORE(type)                                \
 209 static ssize_t type##_store(struct device *dev,                 \
 210                             struct device_attribute *attr,      \
 211                             const char *buf, size_t count)      \
 212 {                                                               \
 213         struct hda_codec *codec = dev_get_drvdata(dev);         \
 214         int err = 0;                                            \
 215         if (*buf)                                               \
 216                 err = type##_codec(codec);                      \
 217         return err < 0 ? err : count;                           \
 218 }
 219
 220 CODEC_ACTION_STORE(reconfig);
 221 CODEC_ACTION_STORE(clear);
 222
 223 static ssize_t init_verbs_show(struct device *dev,
 224                                struct device_attribute *attr,
 225                                char *buf)
 226 {
 227         struct hda_codec *codec = dev_get_drvdata(dev);
 228         int i, len = 0;
 229         mutex_lock(&codec->user_mutex);
 230         for (i = 0; i < codec->init_verbs.used; i++) {
 231                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 232                 len += snprintf(buf + len, PAGE_SIZE - len,
 233                                 "0x%02x 0x%03x 0x%04x\n",
 234                                 v->nid, v->verb, v->param);
 235         }
 236         mutex_unlock(&codec->user_mutex);
 237         return len;
 238 }
 239
 240 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 241 {
 242         struct hda_verb *v;
 243         int nid, verb, param;
 244
 245         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 246                 return -EINVAL;
 247         if (!nid || !verb)
 248                 return -EINVAL;
 249         mutex_lock(&codec->user_mutex);
 250         v = snd_array_new(&codec->init_verbs);
 251         if (!v) {
 252                 mutex_unlock(&codec->user_mutex);
 253                 return -ENOMEM;
 254         }
 255         v->nid = nid;
 256         v->verb = verb;
 257         v->param = param;
 258         mutex_unlock(&codec->user_mutex);
 259         return 0;
 260 }
 261
 262 static ssize_t init_verbs_store(struct device *dev,
 263                                 struct device_attribute *attr,
 264                                 const char *buf, size_t count)
 265 {
 266         struct hda_codec *codec = dev_get_drvdata(dev);
 267         int err = parse_init_verbs(codec, buf);
 268         if (err < 0)
 269                 return err;
 270         return count;
 271 }
 272
 273 static ssize_t hints_show(struct device *dev,
 274                           struct device_attribute *attr,
 275                           char *buf)
 276 {
 277         struct hda_codec *codec = dev_get_drvdata(dev);
 278         int i, len = 0;
 279         mutex_lock(&codec->user_mutex);
 280         for (i = 0; i < codec->hints.used; i++) {
 281                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 282                 len += snprintf(buf + len, PAGE_SIZE - len,
 283                                 "%s = %s\n", hint->key, hint->val);
 284         }
 285         mutex_unlock(&codec->user_mutex);
 286         return len;
 287 }
 288
 289 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 290 {
 291         int i;
 292
 293         for (i = 0; i < codec->hints.used; i++) {
 294                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 295                 if (!strcmp(hint->key, key))
 296                         return hint;
 297         }
 298         return NULL;
 299 }
 300
 301 static void remove_trail_spaces(char *str)
 302 {
 303         char *p;
 304         if (!*str)
 305                 return;
 306         p = str + strlen(str) - 1;
 307         for (; isspace(*p); p--) {
 308                 *p = 0;
 309                 if (p == str)
 310                         return;
 311         }
 312 }
 313
 314 #define MAX_HINTS       1024
 315
 316 static int parse_hints(struct hda_codec *codec, const char *buf)
 317 {
 318         char *key, *val;
 319         struct hda_hint *hint;
 320         int err = 0;
 321
 322         buf = skip_spaces(buf);
 323         if (!*buf || *buf == '#' || *buf == '\n')
 324                 return 0;
 325         if (*buf == '=')
 326                 return -EINVAL;
 327         key = kstrndup_noeol(buf, 1024);
 328         if (!key)
 329                 return -ENOMEM;
 330         /* extract key and val */
 331         val = strchr(key, '=');
 332         if (!val) {
 333                 kfree(key);
 334                 return -EINVAL;
 335         }
 336         *val++ = 0;
 337         val = skip_spaces(val);
 338         remove_trail_spaces(key);
 339         remove_trail_spaces(val);
 340         mutex_lock(&codec->user_mutex);
 341         hint = get_hint(codec, key);
 342         if (hint) {
 343                 /* replace */
 344                 kfree(hint->key);
 345                 hint->key = key;
 346                 hint->val = val;
 347                 goto unlock;
 348         }
 349         /* allocate a new hint entry */
 350         if (codec->hints.used >= MAX_HINTS)
 351                 hint = NULL;
 352         else
 353                 hint = snd_array_new(&codec->hints);
 354         if (hint) {
 355                 hint->key = key;
 356                 hint->val = val;
 357         } else {
 358                 err = -ENOMEM;
 359         }
 360  unlock:
 361         mutex_unlock(&codec->user_mutex);
 362         if (err)
 363                 kfree(key);
 364         return err;
 365 }
 366
 367 static ssize_t hints_store(struct device *dev,
 368                            struct device_attribute *attr,
 369                            const char *buf, size_t count)
 370 {
 371         struct hda_codec *codec = dev_get_drvdata(dev);
 372         int err = parse_hints(codec, buf);
 373         if (err < 0)
 374                 return err;
 375         return count;
 376 }
 377
 378 static ssize_t user_pin_configs_show(struct device *dev,
 379                                      struct device_attribute *attr,
 380                                      char *buf)
 381 {
 382         struct hda_codec *codec = dev_get_drvdata(dev);
 383         return pin_configs_show(codec, &codec->user_pins, buf);
 384 }
 385
 386 #define MAX_PIN_CONFIGS         32
 387
 388 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 389 {
 390         int nid, cfg, err;
 391
 392         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 393                 return -EINVAL;
 394         if (!nid)
 395                 return -EINVAL;
 396         mutex_lock(&codec->user_mutex);
 397         err = snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 398         mutex_unlock(&codec->user_mutex);
 399         return err;
 400 }
 401
 402 static ssize_t user_pin_configs_store(struct device *dev,
 403                                       struct device_attribute *attr,
 404                                       const char *buf, size_t count)
 405 {
 406         struct hda_codec *codec = dev_get_drvdata(dev);
 407         int err = parse_user_pin_configs(codec, buf);
 408         if (err < 0)
 409                 return err;
 410         return count;
 411 }
 412
 413 /* sysfs attributes exposed only when CONFIG_SND_HDA_RECONFIG=y */
 414 static DEVICE_ATTR_RW(init_verbs);
 415 static DEVICE_ATTR_RW(hints);
 416 static DEVICE_ATTR_RW(user_pin_configs);
 417 static DEVICE_ATTR_WO(reconfig);
 418 static DEVICE_ATTR_WO(clear);
 419
 420 /**
 421  * snd_hda_get_hint - Look for hint string
 422  * @codec: the HDA codec
 423  * @key: the hint key string
 424  *
 425  * Look for a hint key/value pair matching with the given key string
 426  * and returns the value string.  If nothing found, returns NULL.
 427  */
 428 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 429 {
 430         struct hda_hint *hint = get_hint(codec, key);
 431         return hint ? hint->val : NULL;
 432 }
 433 EXPORT_SYMBOL_GPL(snd_hda_get_hint);
 434
 435 /**
 436  * snd_hda_get_bool_hint - Get a boolean hint value
 437  * @codec: the HDA codec
 438  * @key: the hint key string
 439  *
 440  * Look for a hint key/value pair matching with the given key string
 441  * and returns a boolean value parsed from the value.  If no matching
 442  * key is found, return a negative value.
 443  */
 444 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 445 {
 446         const char *p;
 447         int ret;
 448
 449         mutex_lock(&codec->user_mutex);
 450         p = snd_hda_get_hint(codec, key);
 451         if (!p || !*p)
 452                 ret = -ENOENT;
 453         else {
 454                 switch (toupper(*p)) {
 455                 case 'T': /* true */
 456                 case 'Y': /* yes */
 457                 case '1':
 458                         ret = 1;
 459                         break;
 460                 default:
 461                         ret = 0;
 462                         break;
 463                 }
 464         }
 465         mutex_unlock(&codec->user_mutex);
 466         return ret;
 467 }
 468 EXPORT_SYMBOL_GPL(snd_hda_get_bool_hint);
 469
 470 /**
 471  * snd_hda_get_int_hint - Get an integer hint value
 472  * @codec: the HDA codec
 473  * @key: the hint key string
 474  * @valp: pointer to store a value
 475  *
 476  * Look for a hint key/value pair matching with the given key string
 477  * and stores the integer value to @valp.  If no matching key is found,
 478  * return a negative error code.  Otherwise it returns zero.
 479  */
 480 int snd_hda_get_int_hint(struct hda_codec *codec, const char *key, int *valp)
 481 {
 482         const char *p;
 483         unsigned long val;
 484         int ret;
 485
 486         mutex_lock(&codec->user_mutex);
 487         p = snd_hda_get_hint(codec, key);
 488         if (!p)
 489                 ret = -ENOENT;
 490         else if (kstrtoul(p, 0, &val))
 491                 ret = -EINVAL;
 492         else {
 493                 *valp = val;
 494                 ret = 0;
 495         }
 496         mutex_unlock(&codec->user_mutex);
 497         return ret;
 498 }
 499 EXPORT_SYMBOL_GPL(snd_hda_get_int_hint);
 500 #endif /* CONFIG_SND_HDA_RECONFIG */
 501
 502 /*
 503  * common sysfs attributes
 504  */
 505 #ifdef CONFIG_SND_HDA_RECONFIG
 506 #define RECONFIG_DEVICE_ATTR(name)      DEVICE_ATTR_RW(name)
 507 #else
 508 #define RECONFIG_DEVICE_ATTR(name)      DEVICE_ATTR_RO(name)
 509 #endif
 510 static RECONFIG_DEVICE_ATTR(vendor_id);
 511 static RECONFIG_DEVICE_ATTR(subsystem_id);
 512 static RECONFIG_DEVICE_ATTR(revision_id);
 513 static DEVICE_ATTR_RO(afg);
 514 static DEVICE_ATTR_RO(mfg);
 515 static RECONFIG_DEVICE_ATTR(vendor_name);
 516 static RECONFIG_DEVICE_ATTR(chip_name);
 517 static RECONFIG_DEVICE_ATTR(modelname);
 518 static DEVICE_ATTR_RO(init_pin_configs);
 519 static DEVICE_ATTR_RO(driver_pin_configs);
 520
 521
 522 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 523
 524 /* parser mode */
 525 enum {
 526         LINE_MODE_NONE,
 527         LINE_MODE_CODEC,
 528         LINE_MODE_MODEL,
 529         LINE_MODE_PINCFG,
 530         LINE_MODE_VERB,
 531         LINE_MODE_HINT,
 532         LINE_MODE_VENDOR_ID,
 533         LINE_MODE_SUBSYSTEM_ID,
 534         LINE_MODE_REVISION_ID,
 535         LINE_MODE_CHIP_NAME,
 536         NUM_LINE_MODES,
 537 };
 538
 539 static inline int strmatch(const char *a, const char *b)
 540 {
 541         return strncasecmp(a, b, strlen(b)) == 0;
 542 }
 543
 544 /* parse the contents after the line "[codec]"
 545  * accept only the line with three numbers, and assign the current codec
 546  */
 547 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 548                              struct hda_codec **codecp)
 549 {
 550         int vendorid, subid, caddr;
 551         struct hda_codec *codec;
 552
 553         *codecp = NULL;
 554         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 555                 list_for_each_codec(codec, bus) {
 556                         if ((vendorid <= 0 || codec->core.vendor_id == vendorid) &&
 557                             (subid <= 0 || codec->core.subsystem_id == subid) &&
 558                             codec->core.addr == caddr) {
 559                                 *codecp = codec;
 560                                 break;
 561                         }
 562                 }
 563         }
 564 }
 565
 566 /* parse the contents after the other command tags, [pincfg], [verb],
 567  * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
 568  * just pass to the sysfs helper (only when any codec was specified)
 569  */
 570 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 571                               struct hda_codec **codecp)
 572 {
 573         parse_user_pin_configs(*codecp, buf);
 574 }
 575
 576 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 577                             struct hda_codec **codecp)
 578 {
 579         parse_init_verbs(*codecp, buf);
 580 }
 581
 582 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 583                             struct hda_codec **codecp)
 584 {
 585         parse_hints(*codecp, buf);
 586 }
 587
 588 static void parse_model_mode(char *buf, struct hda_bus *bus,
 589                              struct hda_codec **codecp)
 590 {
 591         kfree((*codecp)->modelname);
 592         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 593 }
 594
 595 static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
 596                                  struct hda_codec **codecp)
 597 {
 598         snd_hda_codec_set_name(*codecp, buf);
 599 }
 600
 601 #define DEFINE_PARSE_ID_MODE(name) \
 602 static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
 603                                  struct hda_codec **codecp) \
 604 { \
 605         unsigned long val; \
 606         if (!kstrtoul(buf, 0, &val)) \
 607                 (*codecp)->core.name = val; \
 608 }
 609
 610 DEFINE_PARSE_ID_MODE(vendor_id);
 611 DEFINE_PARSE_ID_MODE(subsystem_id);
 612 DEFINE_PARSE_ID_MODE(revision_id);
 613
 614
 615 struct hda_patch_item {
 616         const char *tag;
 617         const char *alias;
 618         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 619 };
 620
 621 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 622         [LINE_MODE_CODEC] = {
 623                 .tag = "[codec]",
 624                 .parser = parse_codec_mode,
 625         },
 626         [LINE_MODE_MODEL] = {
 627                 .tag = "[model]",
 628                 .parser = parse_model_mode,
 629         },
 630         [LINE_MODE_VERB] = {
 631                 .tag = "[verb]",
 632                 .alias = "[init_verbs]",
 633                 .parser = parse_verb_mode,
 634         },
 635         [LINE_MODE_PINCFG] = {
 636                 .tag = "[pincfg]",
 637                 .alias = "[user_pin_configs]",
 638                 .parser = parse_pincfg_mode,
 639         },
 640         [LINE_MODE_HINT] = {
 641                 .tag = "[hint]",
 642                 .alias = "[hints]",
 643                 .parser = parse_hint_mode
 644         },
 645         [LINE_MODE_VENDOR_ID] = {
 646                 .tag = "[vendor_id]",
 647                 .parser = parse_vendor_id_mode,
 648         },
 649         [LINE_MODE_SUBSYSTEM_ID] = {
 650                 .tag = "[subsystem_id]",
 651                 .parser = parse_subsystem_id_mode,
 652         },
 653         [LINE_MODE_REVISION_ID] = {
 654                 .tag = "[revision_id]",
 655                 .parser = parse_revision_id_mode,
 656         },
 657         [LINE_MODE_CHIP_NAME] = {
 658                 .tag = "[chip_name]",
 659                 .parser = parse_chip_name_mode,
 660         },
 661 };
 662
 663 /* check the line starting with '[' -- change the parser mode accodingly */
 664 static int parse_line_mode(char *buf, struct hda_bus *bus)
 665 {
 666         int i;
 667         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 668                 if (!patch_items[i].tag)
 669                         continue;
 670                 if (strmatch(buf, patch_items[i].tag))
 671                         return i;
 672                 if (patch_items[i].alias && strmatch(buf, patch_items[i].alias))
 673                         return i;
 674         }
 675         return LINE_MODE_NONE;
 676 }
 677
 678 /* copy one line from the buffer in fw, and update the fields in fw
 679  * return zero if it reaches to the end of the buffer, or non-zero
 680  * if successfully copied a line
 681  *
 682  * the spaces at the beginning and the end of the line are stripped
 683  */
 684 static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
 685                             const void **fw_data_p)
 686 {
 687         int len;
 688         size_t fw_size = *fw_size_p;
 689         const char *p = *fw_data_p;
 690
 691         while (isspace(*p) && fw_size) {
 692                 p++;
 693                 fw_size--;
 694         }
 695         if (!fw_size)
 696                 return 0;
 697
 698         for (len = 0; len < fw_size; len++) {
 699                 if (!*p)
 700                         break;
 701                 if (*p == '\n') {
 702                         p++;
 703                         len++;
 704                         break;
 705                 }
 706                 if (len < size)
 707                         *buf++ = *p++;
 708         }
 709         *buf = 0;
 710         *fw_size_p = fw_size - len;
 711         *fw_data_p = p;
 712         remove_trail_spaces(buf);
 713         return 1;
 714 }
 715
 716 /**
 717  * snd_hda_load_patch - load a "patch" firmware file and parse it
 718  * @bus: HD-audio bus
 719  * @fw_size: the firmware byte size
 720  * @fw_buf: the firmware data
 721  */
 722 int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
 723 {
 724         char buf[128];
 725         struct hda_codec *codec;
 726         int line_mode;
 727
 728         line_mode = LINE_MODE_NONE;
 729         codec = NULL;
 730         while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
 731                 if (!*buf || *buf == '#' || *buf == '\n')
 732                         continue;
 733                 if (*buf == '[')
 734                         line_mode = parse_line_mode(buf, bus);
 735                 else if (patch_items[line_mode].parser &&
 736                          (codec || line_mode <= LINE_MODE_CODEC))
 737                         patch_items[line_mode].parser(buf, bus, &codec);
 738         }
 739         return 0;
 740 }
 741 EXPORT_SYMBOL_GPL(snd_hda_load_patch);
 742 #endif /* CONFIG_SND_HDA_PATCH_LOADER */
 743
 744 /*
 745  * sysfs entries
 746  */
 747 static struct attribute *hda_dev_attrs[] = {
 748         &dev_attr_vendor_id.attr,
 749         &dev_attr_subsystem_id.attr,
 750         &dev_attr_revision_id.attr,
 751         &dev_attr_afg.attr,
 752         &dev_attr_mfg.attr,
 753         &dev_attr_vendor_name.attr,
 754         &dev_attr_chip_name.attr,
 755         &dev_attr_modelname.attr,
 756         &dev_attr_init_pin_configs.attr,
 757         &dev_attr_driver_pin_configs.attr,
 758 #ifdef CONFIG_PM
 759         &dev_attr_power_on_acct.attr,
 760         &dev_attr_power_off_acct.attr,
 761 #endif
 762 #ifdef CONFIG_SND_HDA_RECONFIG
 763         &dev_attr_init_verbs.attr,
 764         &dev_attr_hints.attr,
 765         &dev_attr_user_pin_configs.attr,
 766         &dev_attr_reconfig.attr,
 767         &dev_attr_clear.attr,
 768 #endif
 769         NULL
 770 };
 771
 772 static struct attribute_group hda_dev_attr_group = {
 773         .attrs  = hda_dev_attrs,
 774 };
 775
 776 const struct attribute_group *snd_hda_dev_attr_groups[] = {
 777         &hda_dev_attr_group,
 778         NULL
 779 };
 780
 781 void snd_hda_sysfs_init(struct hda_codec *codec)
 782 {
 783         mutex_init(&codec->user_mutex);
 784 #ifdef CONFIG_SND_HDA_RECONFIG
 785         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 786         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 787         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 788 #endif
 789 }
 790
 791 void snd_hda_sysfs_clear(struct hda_codec *codec)
 792 {
 793 #ifdef CONFIG_SND_HDA_RECONFIG
 794         int i;
 795
 796         /* clear init verbs */
 797         snd_array_free(&codec->init_verbs);
 798         /* clear hints */
 799         for (i = 0; i < codec->hints.used; i++) {
 800                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 801                 kfree(hint->key); /* we don't need to free hint->val */
 802         }
 803         snd_array_free(&codec->hints);
 804         snd_array_free(&codec->user_pins);
 805 #endif
 806 }