sound/pci/hda/hda_hwdep.c

   1 /*
   2  * HWDEP Interface for HD-audio codec
   3  *
   4  * Copyright (c) 2007 Takashi Iwai <tiwai@suse.de>
   5  *
   6  *  This driver is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This driver is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/pci.h>
  24 #include <linux/compat.h>
  25 #include <linux/mutex.h>
  26 #include <linux/ctype.h>
  27 #include <linux/firmware.h>
  28 #include <sound/core.h>
  29 #include "hda_codec.h"
  30 #include "hda_local.h"
  31 #include <sound/hda_hwdep.h>
  32 #include <sound/minors.h>
  33
  34 /* hint string pair */
  35 struct hda_hint {
  36         const char *key;
  37         const char *val;        /* contained in the same alloc as key */
  38 };
  39
  40 /*
  41  * write/read an out-of-bound verb
  42  */
  43 static int verb_write_ioctl(struct hda_codec *codec,
  44                             struct hda_verb_ioctl __user *arg)
  45 {
  46         u32 verb, res;
  47
  48         if (get_user(verb, &arg->verb))
  49                 return -EFAULT;
  50         res = snd_hda_codec_read(codec, verb >> 24, 0,
  51                                  (verb >> 8) & 0xffff, verb & 0xff);
  52         if (put_user(res, &arg->res))
  53                 return -EFAULT;
  54         return 0;
  55 }
  56
  57 static int get_wcap_ioctl(struct hda_codec *codec,
  58                           struct hda_verb_ioctl __user *arg)
  59 {
  60         u32 verb, res;
  61
  62         if (get_user(verb, &arg->verb))
  63                 return -EFAULT;
  64         res = get_wcaps(codec, verb >> 24);
  65         if (put_user(res, &arg->res))
  66                 return -EFAULT;
  67         return 0;
  68 }
  69
  70
  71 /*
  72  */
  73 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  74                            unsigned int cmd, unsigned long arg)
  75 {
  76         struct hda_codec *codec = hw->private_data;
  77         void __user *argp = (void __user *)arg;
  78
  79         switch (cmd) {
  80         case HDA_IOCTL_PVERSION:
  81                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  82         case HDA_IOCTL_VERB_WRITE:
  83                 return verb_write_ioctl(codec, argp);
  84         case HDA_IOCTL_GET_WCAP:
  85                 return get_wcap_ioctl(codec, argp);
  86         }
  87         return -ENOIOCTLCMD;
  88 }
  89
  90 #ifdef CONFIG_COMPAT
  91 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  92                                   unsigned int cmd, unsigned long arg)
  93 {
  94         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  95 }
  96 #endif
  97
  98 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  99 {
 100 #ifndef CONFIG_SND_DEBUG_VERBOSE
 101         if (!capable(CAP_SYS_RAWIO))
 102                 return -EACCES;
 103 #endif
 104         return 0;
 105 }
 106
 107 static void clear_hwdep_elements(struct hda_codec *codec)
 108 {
 109         int i;
 110
 111         /* clear init verbs */
 112         snd_array_free(&codec->init_verbs);
 113         /* clear hints */
 114         for (i = 0; i < codec->hints.used; i++) {
 115                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 116                 kfree(hint->key); /* we don't need to free hint->val */
 117         }
 118         snd_array_free(&codec->hints);
 119         snd_array_free(&codec->user_pins);
 120 }
 121
 122 static void hwdep_free(struct snd_hwdep *hwdep)
 123 {
 124         clear_hwdep_elements(hwdep->private_data);
 125 }
 126
 127 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 128 {
 129         char hwname[16];
 130         struct snd_hwdep *hwdep;
 131         int err;
 132
 133         sprintf(hwname, "HDA Codec %d", codec->addr);
 134         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 135         if (err < 0)
 136                 return err;
 137         codec->hwdep = hwdep;
 138         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 139         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 140         hwdep->private_data = codec;
 141         hwdep->private_free = hwdep_free;
 142         hwdep->exclusive = 1;
 143
 144         hwdep->ops.open = hda_hwdep_open;
 145         hwdep->ops.ioctl = hda_hwdep_ioctl;
 146 #ifdef CONFIG_COMPAT
 147         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 148 #endif
 149
 150         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 151         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 152         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 153
 154         return 0;
 155 }
 156
 157 #ifdef CONFIG_SND_HDA_RECONFIG
 158
 159 /*
 160  * sysfs interface
 161  */
 162
 163 static int clear_codec(struct hda_codec *codec)
 164 {
 165         int err;
 166
 167         err = snd_hda_codec_reset(codec);
 168         if (err < 0) {
 169                 snd_printk(KERN_ERR "The codec is being used, can't free.\n");
 170                 return err;
 171         }
 172         clear_hwdep_elements(codec);
 173         return 0;
 174 }
 175
 176 static int reconfig_codec(struct hda_codec *codec)
 177 {
 178         int err;
 179
 180         snd_hda_power_up(codec);
 181         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 182         err = snd_hda_codec_reset(codec);
 183         if (err < 0) {
 184                 snd_printk(KERN_ERR
 185                            "The codec is being used, can't reconfigure.\n");
 186                 goto error;
 187         }
 188         err = snd_hda_codec_configure(codec);
 189         if (err < 0)
 190                 goto error;
 191         /* rebuild PCMs */
 192         err = snd_hda_codec_build_pcms(codec);
 193         if (err < 0)
 194                 goto error;
 195         /* rebuild mixers */
 196         err = snd_hda_codec_build_controls(codec);
 197         if (err < 0)
 198                 goto error;
 199         err = snd_card_register(codec->bus->card);
 200  error:
 201         snd_hda_power_down(codec);
 202         return err;
 203 }
 204
 205 /*
 206  * allocate a string at most len chars, and remove the trailing EOL
 207  */
 208 static char *kstrndup_noeol(const char *src, size_t len)
 209 {
 210         char *s = kstrndup(src, len, GFP_KERNEL);
 211         char *p;
 212         if (!s)
 213                 return NULL;
 214         p = strchr(s, '\n');
 215         if (p)
 216                 *p = 0;
 217         return s;
 218 }
 219
 220 #define CODEC_INFO_SHOW(type)                                   \
 221 static ssize_t type##_show(struct device *dev,                  \
 222                            struct device_attribute *attr,       \
 223                            char *buf)                           \
 224 {                                                               \
 225         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 226         struct hda_codec *codec = hwdep->private_data;          \
 227         return sprintf(buf, "0x%x\n", codec->type);             \
 228 }
 229
 230 #define CODEC_INFO_STR_SHOW(type)                               \
 231 static ssize_t type##_show(struct device *dev,                  \
 232                              struct device_attribute *attr,     \
 233                                         char *buf)              \
 234 {                                                               \
 235         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 236         struct hda_codec *codec = hwdep->private_data;          \
 237         return sprintf(buf, "%s\n",                             \
 238                        codec->type ? codec->type : "");         \
 239 }
 240
 241 CODEC_INFO_SHOW(vendor_id);
 242 CODEC_INFO_SHOW(subsystem_id);
 243 CODEC_INFO_SHOW(revision_id);
 244 CODEC_INFO_SHOW(afg);
 245 CODEC_INFO_SHOW(mfg);
 246 CODEC_INFO_STR_SHOW(vendor_name);
 247 CODEC_INFO_STR_SHOW(chip_name);
 248 CODEC_INFO_STR_SHOW(modelname);
 249
 250 #define CODEC_INFO_STORE(type)                                  \
 251 static ssize_t type##_store(struct device *dev,                 \
 252                             struct device_attribute *attr,      \
 253                             const char *buf, size_t count)      \
 254 {                                                               \
 255         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 256         struct hda_codec *codec = hwdep->private_data;          \
 257         char *after;                                            \
 258         codec->type = simple_strtoul(buf, &after, 0);           \
 259         return count;                                           \
 260 }
 261
 262 #define CODEC_INFO_STR_STORE(type)                              \
 263 static ssize_t type##_store(struct device *dev,                 \
 264                             struct device_attribute *attr,      \
 265                             const char *buf, size_t count)      \
 266 {                                                               \
 267         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 268         struct hda_codec *codec = hwdep->private_data;          \
 269         char *s = kstrndup_noeol(buf, 64);                      \
 270         if (!s)                                                 \
 271                 return -ENOMEM;                                 \
 272         kfree(codec->type);                                     \
 273         codec->type = s;                                        \
 274         return count;                                           \
 275 }
 276
 277 CODEC_INFO_STORE(vendor_id);
 278 CODEC_INFO_STORE(subsystem_id);
 279 CODEC_INFO_STORE(revision_id);
 280 CODEC_INFO_STR_STORE(vendor_name);
 281 CODEC_INFO_STR_STORE(chip_name);
 282 CODEC_INFO_STR_STORE(modelname);
 283
 284 #define CODEC_ACTION_STORE(type)                                \
 285 static ssize_t type##_store(struct device *dev,                 \
 286                             struct device_attribute *attr,      \
 287                             const char *buf, size_t count)      \
 288 {                                                               \
 289         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 290         struct hda_codec *codec = hwdep->private_data;          \
 291         int err = 0;                                            \
 292         if (*buf)                                               \
 293                 err = type##_codec(codec);                      \
 294         return err < 0 ? err : count;                           \
 295 }
 296
 297 CODEC_ACTION_STORE(reconfig);
 298 CODEC_ACTION_STORE(clear);
 299
 300 static ssize_t init_verbs_show(struct device *dev,
 301                                struct device_attribute *attr,
 302                                char *buf)
 303 {
 304         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 305         struct hda_codec *codec = hwdep->private_data;
 306         int i, len = 0;
 307         for (i = 0; i < codec->init_verbs.used; i++) {
 308                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 309                 len += snprintf(buf + len, PAGE_SIZE - len,
 310                                 "0x%02x 0x%03x 0x%04x\n",
 311                                 v->nid, v->verb, v->param);
 312         }
 313         return len;
 314 }
 315
 316 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 317 {
 318         struct hda_verb *v;
 319         int nid, verb, param;
 320
 321         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 322                 return -EINVAL;
 323         if (!nid || !verb)
 324                 return -EINVAL;
 325         v = snd_array_new(&codec->init_verbs);
 326         if (!v)
 327                 return -ENOMEM;
 328         v->nid = nid;
 329         v->verb = verb;
 330         v->param = param;
 331         return 0;
 332 }
 333
 334 static ssize_t init_verbs_store(struct device *dev,
 335                                 struct device_attribute *attr,
 336                                 const char *buf, size_t count)
 337 {
 338         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 339         struct hda_codec *codec = hwdep->private_data;
 340         int err = parse_init_verbs(codec, buf);
 341         if (err < 0)
 342                 return err;
 343         return count;
 344 }
 345
 346 static ssize_t hints_show(struct device *dev,
 347                           struct device_attribute *attr,
 348                           char *buf)
 349 {
 350         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 351         struct hda_codec *codec = hwdep->private_data;
 352         int i, len = 0;
 353         for (i = 0; i < codec->hints.used; i++) {
 354                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 355                 len += snprintf(buf + len, PAGE_SIZE - len,
 356                                 "%s = %s\n", hint->key, hint->val);
 357         }
 358         return len;
 359 }
 360
 361 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 362 {
 363         int i;
 364
 365         for (i = 0; i < codec->hints.used; i++) {
 366                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 367                 if (!strcmp(hint->key, key))
 368                         return hint;
 369         }
 370         return NULL;
 371 }
 372
 373 static void remove_trail_spaces(char *str)
 374 {
 375         char *p;
 376         if (!*str)
 377                 return;
 378         p = str + strlen(str) - 1;
 379         for (; isspace(*p); p--) {
 380                 *p = 0;
 381                 if (p == str)
 382                         return;
 383         }
 384 }
 385
 386 #define MAX_HINTS       1024
 387
 388 static int parse_hints(struct hda_codec *codec, const char *buf)
 389 {
 390         char *key, *val;
 391         struct hda_hint *hint;
 392
 393         while (isspace(*buf))
 394                 buf++;
 395         if (!*buf || *buf == '#' || *buf == '\n')
 396                 return 0;
 397         if (*buf == '=')
 398                 return -EINVAL;
 399         key = kstrndup_noeol(buf, 1024);
 400         if (!key)
 401                 return -ENOMEM;
 402         /* extract key and val */
 403         val = strchr(key, '=');
 404         if (!val) {
 405                 kfree(key);
 406                 return -EINVAL;
 407         }
 408         *val++ = 0;
 409         while (isspace(*val))
 410                 val++;
 411         remove_trail_spaces(key);
 412         remove_trail_spaces(val);
 413         hint = get_hint(codec, key);
 414         if (hint) {
 415                 /* replace */
 416                 kfree(hint->key);
 417                 hint->key = key;
 418                 hint->val = val;
 419                 return 0;
 420         }
 421         /* allocate a new hint entry */
 422         if (codec->hints.used >= MAX_HINTS)
 423                 hint = NULL;
 424         else
 425                 hint = snd_array_new(&codec->hints);
 426         if (!hint) {
 427                 kfree(key);
 428                 return -ENOMEM;
 429         }
 430         hint->key = key;
 431         hint->val = val;
 432         return 0;
 433 }
 434
 435 static ssize_t hints_store(struct device *dev,
 436                            struct device_attribute *attr,
 437                            const char *buf, size_t count)
 438 {
 439         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 440         struct hda_codec *codec = hwdep->private_data;
 441         int err = parse_hints(codec, buf);
 442         if (err < 0)
 443                 return err;
 444         return count;
 445 }
 446
 447 static ssize_t pin_configs_show(struct hda_codec *codec,
 448                                 struct snd_array *list,
 449                                 char *buf)
 450 {
 451         int i, len = 0;
 452         for (i = 0; i < list->used; i++) {
 453                 struct hda_pincfg *pin = snd_array_elem(list, i);
 454                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 455                                pin->nid, pin->cfg);
 456         }
 457         return len;
 458 }
 459
 460 static ssize_t init_pin_configs_show(struct device *dev,
 461                                      struct device_attribute *attr,
 462                                      char *buf)
 463 {
 464         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 465         struct hda_codec *codec = hwdep->private_data;
 466         return pin_configs_show(codec, &codec->init_pins, buf);
 467 }
 468
 469 static ssize_t user_pin_configs_show(struct device *dev,
 470                                      struct device_attribute *attr,
 471                                      char *buf)
 472 {
 473         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 474         struct hda_codec *codec = hwdep->private_data;
 475         return pin_configs_show(codec, &codec->user_pins, buf);
 476 }
 477
 478 static ssize_t driver_pin_configs_show(struct device *dev,
 479                                        struct device_attribute *attr,
 480                                        char *buf)
 481 {
 482         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 483         struct hda_codec *codec = hwdep->private_data;
 484         return pin_configs_show(codec, &codec->driver_pins, buf);
 485 }
 486
 487 #define MAX_PIN_CONFIGS         32
 488
 489 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 490 {
 491         int nid, cfg;
 492
 493         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 494                 return -EINVAL;
 495         if (!nid)
 496                 return -EINVAL;
 497         return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 498 }
 499
 500 static ssize_t user_pin_configs_store(struct device *dev,
 501                                       struct device_attribute *attr,
 502                                       const char *buf, size_t count)
 503 {
 504         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 505         struct hda_codec *codec = hwdep->private_data;
 506         int err = parse_user_pin_configs(codec, buf);
 507         if (err < 0)
 508                 return err;
 509         return count;
 510 }
 511
 512 #define CODEC_ATTR_RW(type) \
 513         __ATTR(type, 0644, type##_show, type##_store)
 514 #define CODEC_ATTR_RO(type) \
 515         __ATTR_RO(type)
 516 #define CODEC_ATTR_WO(type) \
 517         __ATTR(type, 0200, NULL, type##_store)
 518
 519 static struct device_attribute codec_attrs[] = {
 520         CODEC_ATTR_RW(vendor_id),
 521         CODEC_ATTR_RW(subsystem_id),
 522         CODEC_ATTR_RW(revision_id),
 523         CODEC_ATTR_RO(afg),
 524         CODEC_ATTR_RO(mfg),
 525         CODEC_ATTR_RW(vendor_name),
 526         CODEC_ATTR_RW(chip_name),
 527         CODEC_ATTR_RW(modelname),
 528         CODEC_ATTR_RW(init_verbs),
 529         CODEC_ATTR_RW(hints),
 530         CODEC_ATTR_RO(init_pin_configs),
 531         CODEC_ATTR_RW(user_pin_configs),
 532         CODEC_ATTR_RO(driver_pin_configs),
 533         CODEC_ATTR_WO(reconfig),
 534         CODEC_ATTR_WO(clear),
 535 };
 536
 537 /*
 538  * create sysfs files on hwdep directory
 539  */
 540 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 541 {
 542         struct snd_hwdep *hwdep = codec->hwdep;
 543         int i;
 544
 545         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 546                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 547                                           hwdep->device, &codec_attrs[i]);
 548         return 0;
 549 }
 550
 551 /*
 552  * Look for hint string
 553  */
 554 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 555 {
 556         struct hda_hint *hint = get_hint(codec, key);
 557         return hint ? hint->val : NULL;
 558 }
 559 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
 560
 561 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 562 {
 563         const char *p = snd_hda_get_hint(codec, key);
 564         if (!p || !*p)
 565                 return -ENOENT;
 566         switch (toupper(*p)) {
 567         case 'T': /* true */
 568         case 'Y': /* yes */
 569         case '1':
 570                 return 1;
 571         }
 572         return 0;
 573 }
 574 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
 575
 576 #endif /* CONFIG_SND_HDA_RECONFIG */
 577
 578 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 579
 580 /* parser mode */
 581 enum {
 582         LINE_MODE_NONE,
 583         LINE_MODE_CODEC,
 584         LINE_MODE_MODEL,
 585         LINE_MODE_PINCFG,
 586         LINE_MODE_VERB,
 587         LINE_MODE_HINT,
 588         NUM_LINE_MODES,
 589 };
 590
 591 static inline int strmatch(const char *a, const char *b)
 592 {
 593         return strnicmp(a, b, strlen(b)) == 0;
 594 }
 595
 596 /* parse the contents after the line "[codec]"
 597  * accept only the line with three numbers, and assign the current codec
 598  */
 599 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 600                              struct hda_codec **codecp)
 601 {
 602         unsigned int vendorid, subid, caddr;
 603         struct hda_codec *codec;
 604
 605         *codecp = NULL;
 606         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 607                 list_for_each_entry(codec, &bus->codec_list, list) {
 608                         if (codec->addr == caddr) {
 609                                 *codecp = codec;
 610                                 break;
 611                         }
 612                 }
 613         }
 614 }
 615
 616 /* parse the contents after the other command tags, [pincfg], [verb],
 617  * [hint] and [model]
 618  * just pass to the sysfs helper (only when any codec was specified)
 619  */
 620 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 621                               struct hda_codec **codecp)
 622 {
 623         if (!*codecp)
 624                 return;
 625         parse_user_pin_configs(*codecp, buf);
 626 }
 627
 628 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 629                             struct hda_codec **codecp)
 630 {
 631         if (!*codecp)
 632                 return;
 633         parse_init_verbs(*codecp, buf);
 634 }
 635
 636 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 637                             struct hda_codec **codecp)
 638 {
 639         if (!*codecp)
 640                 return;
 641         parse_hints(*codecp, buf);
 642 }
 643
 644 static void parse_model_mode(char *buf, struct hda_bus *bus,
 645                              struct hda_codec **codecp)
 646 {
 647         if (!*codecp)
 648                 return;
 649         kfree((*codecp)->modelname);
 650         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 651 }
 652
 653 struct hda_patch_item {
 654         const char *tag;
 655         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 656 };
 657
 658 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 659         [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
 660         [LINE_MODE_MODEL] = { "[model]", parse_model_mode },
 661         [LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
 662         [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
 663         [LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
 664 };
 665
 666 /* check the line starting with '[' -- change the parser mode accodingly */
 667 static int parse_line_mode(char *buf, struct hda_bus *bus)
 668 {
 669         int i;
 670         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 671                 if (!patch_items[i].tag)
 672                         continue;
 673                 if (strmatch(buf, patch_items[i].tag))
 674                         return i;
 675         }
 676         return LINE_MODE_NONE;
 677 }
 678
 679 /* copy one line from the buffer in fw, and update the fields in fw
 680  * return zero if it reaches to the end of the buffer, or non-zero
 681  * if successfully copied a line
 682  *
 683  * the spaces at the beginning and the end of the line are stripped
 684  */
 685 static int get_line_from_fw(char *buf, int size, struct firmware *fw)
 686 {
 687         int len;
 688         const char *p = fw->data;
 689         while (isspace(*p) && fw->size) {
 690                 p++;
 691                 fw->size--;
 692         }
 693         if (!fw->size)
 694                 return 0;
 695         if (size < fw->size)
 696                 size = fw->size;
 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 -= len;
 711         fw->data = p;
 712         remove_trail_spaces(buf);
 713         return 1;
 714 }
 715
 716 /*
 717  * load a "patch" firmware file and parse it
 718  */
 719 int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
 720 {
 721         int err;
 722         const struct firmware *fw;
 723         struct firmware tmp;
 724         char buf[128];
 725         struct hda_codec *codec;
 726         int line_mode;
 727         struct device *dev = bus->card->dev;
 728
 729         if (snd_BUG_ON(!dev))
 730                 return -ENODEV;
 731         err = request_firmware(&fw, patch, dev);
 732         if (err < 0) {
 733                 printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
 734                        patch);
 735                 return err;
 736         }
 737
 738         tmp = *fw;
 739         line_mode = LINE_MODE_NONE;
 740         codec = NULL;
 741         while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
 742                 if (!*buf || *buf == '#' || *buf == '\n')
 743                         continue;
 744                 if (*buf == '[')
 745                         line_mode = parse_line_mode(buf, bus);
 746                 else if (patch_items[line_mode].parser)
 747                         patch_items[line_mode].parser(buf, bus, &codec);
 748         }
 749         release_firmware(fw);
 750         return 0;
 751 }
 752 EXPORT_SYMBOL_HDA(snd_hda_load_patch);
 753 #endif /* CONFIG_SND_HDA_PATCH_LOADER */