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