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_POWER_SAVE
 158 static ssize_t power_on_acct_show(struct device *dev,
 159                                   struct device_attribute *attr,
 160                                   char *buf)
 161 {
 162         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 163         struct hda_codec *codec = hwdep->private_data;
 164         snd_hda_update_power_acct(codec);
 165         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
 166 }
 167
 168 static ssize_t power_off_acct_show(struct device *dev,
 169                                    struct device_attribute *attr,
 170                                    char *buf)
 171 {
 172         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 173         struct hda_codec *codec = hwdep->private_data;
 174         snd_hda_update_power_acct(codec);
 175         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
 176 }
 177
 178 static struct device_attribute power_attrs[] = {
 179         __ATTR_RO(power_on_acct),
 180         __ATTR_RO(power_off_acct),
 181 };
 182
 183 int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
 184 {
 185         struct snd_hwdep *hwdep = codec->hwdep;
 186         int i;
 187
 188         for (i = 0; i < ARRAY_SIZE(power_attrs); i++)
 189                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 190                                           hwdep->device, &power_attrs[i]);
 191         return 0;
 192 }
 193 #endif /* CONFIG_SND_HDA_POWER_SAVE */
 194
 195 #ifdef CONFIG_SND_HDA_RECONFIG
 196
 197 /*
 198  * sysfs interface
 199  */
 200
 201 static int clear_codec(struct hda_codec *codec)
 202 {
 203         int err;
 204
 205         err = snd_hda_codec_reset(codec);
 206         if (err < 0) {
 207                 snd_printk(KERN_ERR "The codec is being used, can't free.\n");
 208                 return err;
 209         }
 210         clear_hwdep_elements(codec);
 211         return 0;
 212 }
 213
 214 static int reconfig_codec(struct hda_codec *codec)
 215 {
 216         int err;
 217
 218         snd_hda_power_up(codec);
 219         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 220         err = snd_hda_codec_reset(codec);
 221         if (err < 0) {
 222                 snd_printk(KERN_ERR
 223                            "The codec is being used, can't reconfigure.\n");
 224                 goto error;
 225         }
 226         err = snd_hda_codec_configure(codec);
 227         if (err < 0)
 228                 goto error;
 229         /* rebuild PCMs */
 230         err = snd_hda_codec_build_pcms(codec);
 231         if (err < 0)
 232                 goto error;
 233         /* rebuild mixers */
 234         err = snd_hda_codec_build_controls(codec);
 235         if (err < 0)
 236                 goto error;
 237         err = snd_card_register(codec->bus->card);
 238  error:
 239         snd_hda_power_down(codec);
 240         return err;
 241 }
 242
 243 /*
 244  * allocate a string at most len chars, and remove the trailing EOL
 245  */
 246 static char *kstrndup_noeol(const char *src, size_t len)
 247 {
 248         char *s = kstrndup(src, len, GFP_KERNEL);
 249         char *p;
 250         if (!s)
 251                 return NULL;
 252         p = strchr(s, '\n');
 253         if (p)
 254                 *p = 0;
 255         return s;
 256 }
 257
 258 #define CODEC_INFO_SHOW(type)                                   \
 259 static ssize_t type##_show(struct device *dev,                  \
 260                            struct device_attribute *attr,       \
 261                            char *buf)                           \
 262 {                                                               \
 263         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 264         struct hda_codec *codec = hwdep->private_data;          \
 265         return sprintf(buf, "0x%x\n", codec->type);             \
 266 }
 267
 268 #define CODEC_INFO_STR_SHOW(type)                               \
 269 static ssize_t type##_show(struct device *dev,                  \
 270                              struct device_attribute *attr,     \
 271                                         char *buf)              \
 272 {                                                               \
 273         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 274         struct hda_codec *codec = hwdep->private_data;          \
 275         return sprintf(buf, "%s\n",                             \
 276                        codec->type ? codec->type : "");         \
 277 }
 278
 279 CODEC_INFO_SHOW(vendor_id);
 280 CODEC_INFO_SHOW(subsystem_id);
 281 CODEC_INFO_SHOW(revision_id);
 282 CODEC_INFO_SHOW(afg);
 283 CODEC_INFO_SHOW(mfg);
 284 CODEC_INFO_STR_SHOW(vendor_name);
 285 CODEC_INFO_STR_SHOW(chip_name);
 286 CODEC_INFO_STR_SHOW(modelname);
 287
 288 #define CODEC_INFO_STORE(type)                                  \
 289 static ssize_t type##_store(struct device *dev,                 \
 290                             struct device_attribute *attr,      \
 291                             const char *buf, size_t count)      \
 292 {                                                               \
 293         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 294         struct hda_codec *codec = hwdep->private_data;          \
 295         char *after;                                            \
 296         codec->type = simple_strtoul(buf, &after, 0);           \
 297         return count;                                           \
 298 }
 299
 300 #define CODEC_INFO_STR_STORE(type)                              \
 301 static ssize_t type##_store(struct device *dev,                 \
 302                             struct device_attribute *attr,      \
 303                             const char *buf, size_t count)      \
 304 {                                                               \
 305         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 306         struct hda_codec *codec = hwdep->private_data;          \
 307         char *s = kstrndup_noeol(buf, 64);                      \
 308         if (!s)                                                 \
 309                 return -ENOMEM;                                 \
 310         kfree(codec->type);                                     \
 311         codec->type = s;                                        \
 312         return count;                                           \
 313 }
 314
 315 CODEC_INFO_STORE(vendor_id);
 316 CODEC_INFO_STORE(subsystem_id);
 317 CODEC_INFO_STORE(revision_id);
 318 CODEC_INFO_STR_STORE(vendor_name);
 319 CODEC_INFO_STR_STORE(chip_name);
 320 CODEC_INFO_STR_STORE(modelname);
 321
 322 #define CODEC_ACTION_STORE(type)                                \
 323 static ssize_t type##_store(struct device *dev,                 \
 324                             struct device_attribute *attr,      \
 325                             const char *buf, size_t count)      \
 326 {                                                               \
 327         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 328         struct hda_codec *codec = hwdep->private_data;          \
 329         int err = 0;                                            \
 330         if (*buf)                                               \
 331                 err = type##_codec(codec);                      \
 332         return err < 0 ? err : count;                           \
 333 }
 334
 335 CODEC_ACTION_STORE(reconfig);
 336 CODEC_ACTION_STORE(clear);
 337
 338 static ssize_t init_verbs_show(struct device *dev,
 339                                struct device_attribute *attr,
 340                                char *buf)
 341 {
 342         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 343         struct hda_codec *codec = hwdep->private_data;
 344         int i, len = 0;
 345         for (i = 0; i < codec->init_verbs.used; i++) {
 346                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 347                 len += snprintf(buf + len, PAGE_SIZE - len,
 348                                 "0x%02x 0x%03x 0x%04x\n",
 349                                 v->nid, v->verb, v->param);
 350         }
 351         return len;
 352 }
 353
 354 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 355 {
 356         struct hda_verb *v;
 357         int nid, verb, param;
 358
 359         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 360                 return -EINVAL;
 361         if (!nid || !verb)
 362                 return -EINVAL;
 363         v = snd_array_new(&codec->init_verbs);
 364         if (!v)
 365                 return -ENOMEM;
 366         v->nid = nid;
 367         v->verb = verb;
 368         v->param = param;
 369         return 0;
 370 }
 371
 372 static ssize_t init_verbs_store(struct device *dev,
 373                                 struct device_attribute *attr,
 374                                 const char *buf, size_t count)
 375 {
 376         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 377         struct hda_codec *codec = hwdep->private_data;
 378         int err = parse_init_verbs(codec, buf);
 379         if (err < 0)
 380                 return err;
 381         return count;
 382 }
 383
 384 static ssize_t hints_show(struct device *dev,
 385                           struct device_attribute *attr,
 386                           char *buf)
 387 {
 388         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 389         struct hda_codec *codec = hwdep->private_data;
 390         int i, len = 0;
 391         for (i = 0; i < codec->hints.used; i++) {
 392                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 393                 len += snprintf(buf + len, PAGE_SIZE - len,
 394                                 "%s = %s\n", hint->key, hint->val);
 395         }
 396         return len;
 397 }
 398
 399 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 400 {
 401         int i;
 402
 403         for (i = 0; i < codec->hints.used; i++) {
 404                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 405                 if (!strcmp(hint->key, key))
 406                         return hint;
 407         }
 408         return NULL;
 409 }
 410
 411 static void remove_trail_spaces(char *str)
 412 {
 413         char *p;
 414         if (!*str)
 415                 return;
 416         p = str + strlen(str) - 1;
 417         for (; isspace(*p); p--) {
 418                 *p = 0;
 419                 if (p == str)
 420                         return;
 421         }
 422 }
 423
 424 #define MAX_HINTS       1024
 425
 426 static int parse_hints(struct hda_codec *codec, const char *buf)
 427 {
 428         char *key, *val;
 429         struct hda_hint *hint;
 430
 431         while (isspace(*buf))
 432                 buf++;
 433         if (!*buf || *buf == '#' || *buf == '\n')
 434                 return 0;
 435         if (*buf == '=')
 436                 return -EINVAL;
 437         key = kstrndup_noeol(buf, 1024);
 438         if (!key)
 439                 return -ENOMEM;
 440         /* extract key and val */
 441         val = strchr(key, '=');
 442         if (!val) {
 443                 kfree(key);
 444                 return -EINVAL;
 445         }
 446         *val++ = 0;
 447         while (isspace(*val))
 448                 val++;
 449         remove_trail_spaces(key);
 450         remove_trail_spaces(val);
 451         hint = get_hint(codec, key);
 452         if (hint) {
 453                 /* replace */
 454                 kfree(hint->key);
 455                 hint->key = key;
 456                 hint->val = val;
 457                 return 0;
 458         }
 459         /* allocate a new hint entry */
 460         if (codec->hints.used >= MAX_HINTS)
 461                 hint = NULL;
 462         else
 463                 hint = snd_array_new(&codec->hints);
 464         if (!hint) {
 465                 kfree(key);
 466                 return -ENOMEM;
 467         }
 468         hint->key = key;
 469         hint->val = val;
 470         return 0;
 471 }
 472
 473 static ssize_t hints_store(struct device *dev,
 474                            struct device_attribute *attr,
 475                            const char *buf, size_t count)
 476 {
 477         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 478         struct hda_codec *codec = hwdep->private_data;
 479         int err = parse_hints(codec, buf);
 480         if (err < 0)
 481                 return err;
 482         return count;
 483 }
 484
 485 static ssize_t pin_configs_show(struct hda_codec *codec,
 486                                 struct snd_array *list,
 487                                 char *buf)
 488 {
 489         int i, len = 0;
 490         for (i = 0; i < list->used; i++) {
 491                 struct hda_pincfg *pin = snd_array_elem(list, i);
 492                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 493                                pin->nid, pin->cfg);
 494         }
 495         return len;
 496 }
 497
 498 static ssize_t init_pin_configs_show(struct device *dev,
 499                                      struct device_attribute *attr,
 500                                      char *buf)
 501 {
 502         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 503         struct hda_codec *codec = hwdep->private_data;
 504         return pin_configs_show(codec, &codec->init_pins, buf);
 505 }
 506
 507 static ssize_t user_pin_configs_show(struct device *dev,
 508                                      struct device_attribute *attr,
 509                                      char *buf)
 510 {
 511         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 512         struct hda_codec *codec = hwdep->private_data;
 513         return pin_configs_show(codec, &codec->user_pins, buf);
 514 }
 515
 516 static ssize_t driver_pin_configs_show(struct device *dev,
 517                                        struct device_attribute *attr,
 518                                        char *buf)
 519 {
 520         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 521         struct hda_codec *codec = hwdep->private_data;
 522         return pin_configs_show(codec, &codec->driver_pins, buf);
 523 }
 524
 525 #define MAX_PIN_CONFIGS         32
 526
 527 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 528 {
 529         int nid, cfg;
 530
 531         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 532                 return -EINVAL;
 533         if (!nid)
 534                 return -EINVAL;
 535         return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 536 }
 537
 538 static ssize_t user_pin_configs_store(struct device *dev,
 539                                       struct device_attribute *attr,
 540                                       const char *buf, size_t count)
 541 {
 542         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 543         struct hda_codec *codec = hwdep->private_data;
 544         int err = parse_user_pin_configs(codec, buf);
 545         if (err < 0)
 546                 return err;
 547         return count;
 548 }
 549
 550 #define CODEC_ATTR_RW(type) \
 551         __ATTR(type, 0644, type##_show, type##_store)
 552 #define CODEC_ATTR_RO(type) \
 553         __ATTR_RO(type)
 554 #define CODEC_ATTR_WO(type) \
 555         __ATTR(type, 0200, NULL, type##_store)
 556
 557 static struct device_attribute codec_attrs[] = {
 558         CODEC_ATTR_RW(vendor_id),
 559         CODEC_ATTR_RW(subsystem_id),
 560         CODEC_ATTR_RW(revision_id),
 561         CODEC_ATTR_RO(afg),
 562         CODEC_ATTR_RO(mfg),
 563         CODEC_ATTR_RW(vendor_name),
 564         CODEC_ATTR_RW(chip_name),
 565         CODEC_ATTR_RW(modelname),
 566         CODEC_ATTR_RW(init_verbs),
 567         CODEC_ATTR_RW(hints),
 568         CODEC_ATTR_RO(init_pin_configs),
 569         CODEC_ATTR_RW(user_pin_configs),
 570         CODEC_ATTR_RO(driver_pin_configs),
 571         CODEC_ATTR_WO(reconfig),
 572         CODEC_ATTR_WO(clear),
 573 };
 574
 575 /*
 576  * create sysfs files on hwdep directory
 577  */
 578 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 579 {
 580         struct snd_hwdep *hwdep = codec->hwdep;
 581         int i;
 582
 583         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 584                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 585                                           hwdep->device, &codec_attrs[i]);
 586         return 0;
 587 }
 588
 589 /*
 590  * Look for hint string
 591  */
 592 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 593 {
 594         struct hda_hint *hint = get_hint(codec, key);
 595         return hint ? hint->val : NULL;
 596 }
 597 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
 598
 599 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 600 {
 601         const char *p = snd_hda_get_hint(codec, key);
 602         if (!p || !*p)
 603                 return -ENOENT;
 604         switch (toupper(*p)) {
 605         case 'T': /* true */
 606         case 'Y': /* yes */
 607         case '1':
 608                 return 1;
 609         }
 610         return 0;
 611 }
 612 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
 613
 614 #endif /* CONFIG_SND_HDA_RECONFIG */
 615
 616 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 617
 618 /* parser mode */
 619 enum {
 620         LINE_MODE_NONE,
 621         LINE_MODE_CODEC,
 622         LINE_MODE_MODEL,
 623         LINE_MODE_PINCFG,
 624         LINE_MODE_VERB,
 625         LINE_MODE_HINT,
 626         NUM_LINE_MODES,
 627 };
 628
 629 static inline int strmatch(const char *a, const char *b)
 630 {
 631         return strnicmp(a, b, strlen(b)) == 0;
 632 }
 633
 634 /* parse the contents after the line "[codec]"
 635  * accept only the line with three numbers, and assign the current codec
 636  */
 637 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 638                              struct hda_codec **codecp)
 639 {
 640         unsigned int vendorid, subid, caddr;
 641         struct hda_codec *codec;
 642
 643         *codecp = NULL;
 644         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 645                 list_for_each_entry(codec, &bus->codec_list, list) {
 646                         if (codec->addr == caddr) {
 647                                 *codecp = codec;
 648                                 break;
 649                         }
 650                 }
 651         }
 652 }
 653
 654 /* parse the contents after the other command tags, [pincfg], [verb],
 655  * [hint] and [model]
 656  * just pass to the sysfs helper (only when any codec was specified)
 657  */
 658 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 659                               struct hda_codec **codecp)
 660 {
 661         if (!*codecp)
 662                 return;
 663         parse_user_pin_configs(*codecp, buf);
 664 }
 665
 666 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 667                             struct hda_codec **codecp)
 668 {
 669         if (!*codecp)
 670                 return;
 671         parse_init_verbs(*codecp, buf);
 672 }
 673
 674 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 675                             struct hda_codec **codecp)
 676 {
 677         if (!*codecp)
 678                 return;
 679         parse_hints(*codecp, buf);
 680 }
 681
 682 static void parse_model_mode(char *buf, struct hda_bus *bus,
 683                              struct hda_codec **codecp)
 684 {
 685         if (!*codecp)
 686                 return;
 687         kfree((*codecp)->modelname);
 688         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 689 }
 690
 691 struct hda_patch_item {
 692         const char *tag;
 693         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 694 };
 695
 696 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 697         [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
 698         [LINE_MODE_MODEL] = { "[model]", parse_model_mode },
 699         [LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
 700         [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
 701         [LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
 702 };
 703
 704 /* check the line starting with '[' -- change the parser mode accodingly */
 705 static int parse_line_mode(char *buf, struct hda_bus *bus)
 706 {
 707         int i;
 708         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 709                 if (!patch_items[i].tag)
 710                         continue;
 711                 if (strmatch(buf, patch_items[i].tag))
 712                         return i;
 713         }
 714         return LINE_MODE_NONE;
 715 }
 716
 717 /* copy one line from the buffer in fw, and update the fields in fw
 718  * return zero if it reaches to the end of the buffer, or non-zero
 719  * if successfully copied a line
 720  *
 721  * the spaces at the beginning and the end of the line are stripped
 722  */
 723 static int get_line_from_fw(char *buf, int size, struct firmware *fw)
 724 {
 725         int len;
 726         const char *p = fw->data;
 727         while (isspace(*p) && fw->size) {
 728                 p++;
 729                 fw->size--;
 730         }
 731         if (!fw->size)
 732                 return 0;
 733         if (size < fw->size)
 734                 size = fw->size;
 735
 736         for (len = 0; len < fw->size; len++) {
 737                 if (!*p)
 738                         break;
 739                 if (*p == '\n') {
 740                         p++;
 741                         len++;
 742                         break;
 743                 }
 744                 if (len < size)
 745                         *buf++ = *p++;
 746         }
 747         *buf = 0;
 748         fw->size -= len;
 749         fw->data = p;
 750         remove_trail_spaces(buf);
 751         return 1;
 752 }
 753
 754 /*
 755  * load a "patch" firmware file and parse it
 756  */
 757 int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
 758 {
 759         int err;
 760         const struct firmware *fw;
 761         struct firmware tmp;
 762         char buf[128];
 763         struct hda_codec *codec;
 764         int line_mode;
 765         struct device *dev = bus->card->dev;
 766
 767         if (snd_BUG_ON(!dev))
 768                 return -ENODEV;
 769         err = request_firmware(&fw, patch, dev);
 770         if (err < 0) {
 771                 printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
 772                        patch);
 773                 return err;
 774         }
 775
 776         tmp = *fw;
 777         line_mode = LINE_MODE_NONE;
 778         codec = NULL;
 779         while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
 780                 if (!*buf || *buf == '#' || *buf == '\n')
 781                         continue;
 782                 if (*buf == '[')
 783                         line_mode = parse_line_mode(buf, bus);
 784                 else if (patch_items[line_mode].parser)
 785                         patch_items[line_mode].parser(buf, bus, &codec);
 786         }
 787         release_firmware(fw);
 788         return 0;
 789 }
 790 EXPORT_SYMBOL_HDA(snd_hda_load_patch);
 791 #endif /* CONFIG_SND_HDA_PATCH_LOADER */