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/string.h>
  28 #include <linux/firmware.h>
  29 #include <sound/core.h>
  30 #include "hda_codec.h"
  31 #include "hda_local.h"
  32 #include <sound/hda_hwdep.h>
  33 #include <sound/minors.h>
  34
  35 /* hint string pair */
  36 struct hda_hint {
  37         const char *key;
  38         const char *val;        /* contained in the same alloc as key */
  39 };
  40
  41 /*
  42  * write/read an out-of-bound verb
  43  */
  44 static int verb_write_ioctl(struct hda_codec *codec,
  45                             struct hda_verb_ioctl __user *arg)
  46 {
  47         u32 verb, res;
  48
  49         if (get_user(verb, &arg->verb))
  50                 return -EFAULT;
  51         res = snd_hda_codec_read(codec, verb >> 24, 0,
  52                                  (verb >> 8) & 0xffff, verb & 0xff);
  53         if (put_user(res, &arg->res))
  54                 return -EFAULT;
  55         return 0;
  56 }
  57
  58 static int get_wcap_ioctl(struct hda_codec *codec,
  59                           struct hda_verb_ioctl __user *arg)
  60 {
  61         u32 verb, res;
  62
  63         if (get_user(verb, &arg->verb))
  64                 return -EFAULT;
  65         res = get_wcaps(codec, verb >> 24);
  66         if (put_user(res, &arg->res))
  67                 return -EFAULT;
  68         return 0;
  69 }
  70
  71
  72 /*
  73  */
  74 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  75                            unsigned int cmd, unsigned long arg)
  76 {
  77         struct hda_codec *codec = hw->private_data;
  78         void __user *argp = (void __user *)arg;
  79
  80         switch (cmd) {
  81         case HDA_IOCTL_PVERSION:
  82                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  83         case HDA_IOCTL_VERB_WRITE:
  84                 return verb_write_ioctl(codec, argp);
  85         case HDA_IOCTL_GET_WCAP:
  86                 return get_wcap_ioctl(codec, argp);
  87         }
  88         return -ENOIOCTLCMD;
  89 }
  90
  91 #ifdef CONFIG_COMPAT
  92 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  93                                   unsigned int cmd, unsigned long arg)
  94 {
  95         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  96 }
  97 #endif
  98
  99 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
 100 {
 101 #ifndef CONFIG_SND_DEBUG_VERBOSE
 102         if (!capable(CAP_SYS_RAWIO))
 103                 return -EACCES;
 104 #endif
 105         return 0;
 106 }
 107
 108 static void clear_hwdep_elements(struct hda_codec *codec)
 109 {
 110         int i;
 111
 112         /* clear init verbs */
 113         snd_array_free(&codec->init_verbs);
 114         /* clear hints */
 115         for (i = 0; i < codec->hints.used; i++) {
 116                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 117                 kfree(hint->key); /* we don't need to free hint->val */
 118         }
 119         snd_array_free(&codec->hints);
 120         snd_array_free(&codec->user_pins);
 121 }
 122
 123 static void hwdep_free(struct snd_hwdep *hwdep)
 124 {
 125         clear_hwdep_elements(hwdep->private_data);
 126 }
 127
 128 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 129 {
 130         char hwname[16];
 131         struct snd_hwdep *hwdep;
 132         int err;
 133
 134         sprintf(hwname, "HDA Codec %d", codec->addr);
 135         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 136         if (err < 0)
 137                 return err;
 138         codec->hwdep = hwdep;
 139         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 140         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 141         hwdep->private_data = codec;
 142         hwdep->private_free = hwdep_free;
 143         hwdep->exclusive = 1;
 144
 145         hwdep->ops.open = hda_hwdep_open;
 146         hwdep->ops.ioctl = hda_hwdep_ioctl;
 147 #ifdef CONFIG_COMPAT
 148         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 149 #endif
 150
 151         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 152         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 153         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 154
 155         return 0;
 156 }
 157
 158 #ifdef CONFIG_SND_HDA_POWER_SAVE
 159 static ssize_t power_on_acct_show(struct device *dev,
 160                                   struct device_attribute *attr,
 161                                   char *buf)
 162 {
 163         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 164         struct hda_codec *codec = hwdep->private_data;
 165         snd_hda_update_power_acct(codec);
 166         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
 167 }
 168
 169 static ssize_t power_off_acct_show(struct device *dev,
 170                                    struct device_attribute *attr,
 171                                    char *buf)
 172 {
 173         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 174         struct hda_codec *codec = hwdep->private_data;
 175         snd_hda_update_power_acct(codec);
 176         return sprintf(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
 177 }
 178
 179 static struct device_attribute power_attrs[] = {
 180         __ATTR_RO(power_on_acct),
 181         __ATTR_RO(power_off_acct),
 182 };
 183
 184 int snd_hda_hwdep_add_power_sysfs(struct hda_codec *codec)
 185 {
 186         struct snd_hwdep *hwdep = codec->hwdep;
 187         int i;
 188
 189         for (i = 0; i < ARRAY_SIZE(power_attrs); i++)
 190                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 191                                           hwdep->device, &power_attrs[i]);
 192         return 0;
 193 }
 194 #endif /* CONFIG_SND_HDA_POWER_SAVE */
 195
 196 #ifdef CONFIG_SND_HDA_RECONFIG
 197
 198 /*
 199  * sysfs interface
 200  */
 201
 202 static int clear_codec(struct hda_codec *codec)
 203 {
 204         int err;
 205
 206         err = snd_hda_codec_reset(codec);
 207         if (err < 0) {
 208                 snd_printk(KERN_ERR "The codec is being used, can't free.\n");
 209                 return err;
 210         }
 211         clear_hwdep_elements(codec);
 212         return 0;
 213 }
 214
 215 static int reconfig_codec(struct hda_codec *codec)
 216 {
 217         int err;
 218
 219         snd_hda_power_up(codec);
 220         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 221         err = snd_hda_codec_reset(codec);
 222         if (err < 0) {
 223                 snd_printk(KERN_ERR
 224                            "The codec is being used, can't reconfigure.\n");
 225                 goto error;
 226         }
 227         err = snd_hda_codec_configure(codec);
 228         if (err < 0)
 229                 goto error;
 230         /* rebuild PCMs */
 231         err = snd_hda_codec_build_pcms(codec);
 232         if (err < 0)
 233                 goto error;
 234         /* rebuild mixers */
 235         err = snd_hda_codec_build_controls(codec);
 236         if (err < 0)
 237                 goto error;
 238         err = snd_card_register(codec->bus->card);
 239  error:
 240         snd_hda_power_down(codec);
 241         return err;
 242 }
 243
 244 /*
 245  * allocate a string at most len chars, and remove the trailing EOL
 246  */
 247 static char *kstrndup_noeol(const char *src, size_t len)
 248 {
 249         char *s = kstrndup(src, len, GFP_KERNEL);
 250         char *p;
 251         if (!s)
 252                 return NULL;
 253         p = strchr(s, '\n');
 254         if (p)
 255                 *p = 0;
 256         return s;
 257 }
 258
 259 #define CODEC_INFO_SHOW(type)                                   \
 260 static ssize_t type##_show(struct device *dev,                  \
 261                            struct device_attribute *attr,       \
 262                            char *buf)                           \
 263 {                                                               \
 264         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 265         struct hda_codec *codec = hwdep->private_data;          \
 266         return sprintf(buf, "0x%x\n", codec->type);             \
 267 }
 268
 269 #define CODEC_INFO_STR_SHOW(type)                               \
 270 static ssize_t type##_show(struct device *dev,                  \
 271                              struct device_attribute *attr,     \
 272                                         char *buf)              \
 273 {                                                               \
 274         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 275         struct hda_codec *codec = hwdep->private_data;          \
 276         return sprintf(buf, "%s\n",                             \
 277                        codec->type ? codec->type : "");         \
 278 }
 279
 280 CODEC_INFO_SHOW(vendor_id);
 281 CODEC_INFO_SHOW(subsystem_id);
 282 CODEC_INFO_SHOW(revision_id);
 283 CODEC_INFO_SHOW(afg);
 284 CODEC_INFO_SHOW(mfg);
 285 CODEC_INFO_STR_SHOW(vendor_name);
 286 CODEC_INFO_STR_SHOW(chip_name);
 287 CODEC_INFO_STR_SHOW(modelname);
 288
 289 #define CODEC_INFO_STORE(type)                                  \
 290 static ssize_t type##_store(struct device *dev,                 \
 291                             struct device_attribute *attr,      \
 292                             const char *buf, size_t count)      \
 293 {                                                               \
 294         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 295         struct hda_codec *codec = hwdep->private_data;          \
 296         char *after;                                            \
 297         codec->type = simple_strtoul(buf, &after, 0);           \
 298         return count;                                           \
 299 }
 300
 301 #define CODEC_INFO_STR_STORE(type)                              \
 302 static ssize_t type##_store(struct device *dev,                 \
 303                             struct device_attribute *attr,      \
 304                             const char *buf, size_t count)      \
 305 {                                                               \
 306         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 307         struct hda_codec *codec = hwdep->private_data;          \
 308         char *s = kstrndup_noeol(buf, 64);                      \
 309         if (!s)                                                 \
 310                 return -ENOMEM;                                 \
 311         kfree(codec->type);                                     \
 312         codec->type = s;                                        \
 313         return count;                                           \
 314 }
 315
 316 CODEC_INFO_STORE(vendor_id);
 317 CODEC_INFO_STORE(subsystem_id);
 318 CODEC_INFO_STORE(revision_id);
 319 CODEC_INFO_STR_STORE(vendor_name);
 320 CODEC_INFO_STR_STORE(chip_name);
 321 CODEC_INFO_STR_STORE(modelname);
 322
 323 #define CODEC_ACTION_STORE(type)                                \
 324 static ssize_t type##_store(struct device *dev,                 \
 325                             struct device_attribute *attr,      \
 326                             const char *buf, size_t count)      \
 327 {                                                               \
 328         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 329         struct hda_codec *codec = hwdep->private_data;          \
 330         int err = 0;                                            \
 331         if (*buf)                                               \
 332                 err = type##_codec(codec);                      \
 333         return err < 0 ? err : count;                           \
 334 }
 335
 336 CODEC_ACTION_STORE(reconfig);
 337 CODEC_ACTION_STORE(clear);
 338
 339 static ssize_t init_verbs_show(struct device *dev,
 340                                struct device_attribute *attr,
 341                                char *buf)
 342 {
 343         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 344         struct hda_codec *codec = hwdep->private_data;
 345         int i, len = 0;
 346         for (i = 0; i < codec->init_verbs.used; i++) {
 347                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 348                 len += snprintf(buf + len, PAGE_SIZE - len,
 349                                 "0x%02x 0x%03x 0x%04x\n",
 350                                 v->nid, v->verb, v->param);
 351         }
 352         return len;
 353 }
 354
 355 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 356 {
 357         struct hda_verb *v;
 358         int nid, verb, param;
 359
 360         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 361                 return -EINVAL;
 362         if (!nid || !verb)
 363                 return -EINVAL;
 364         v = snd_array_new(&codec->init_verbs);
 365         if (!v)
 366                 return -ENOMEM;
 367         v->nid = nid;
 368         v->verb = verb;
 369         v->param = param;
 370         return 0;
 371 }
 372
 373 static ssize_t init_verbs_store(struct device *dev,
 374                                 struct device_attribute *attr,
 375                                 const char *buf, size_t count)
 376 {
 377         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 378         struct hda_codec *codec = hwdep->private_data;
 379         int err = parse_init_verbs(codec, buf);
 380         if (err < 0)
 381                 return err;
 382         return count;
 383 }
 384
 385 static ssize_t hints_show(struct device *dev,
 386                           struct device_attribute *attr,
 387                           char *buf)
 388 {
 389         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 390         struct hda_codec *codec = hwdep->private_data;
 391         int i, len = 0;
 392         for (i = 0; i < codec->hints.used; i++) {
 393                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 394                 len += snprintf(buf + len, PAGE_SIZE - len,
 395                                 "%s = %s\n", hint->key, hint->val);
 396         }
 397         return len;
 398 }
 399
 400 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 401 {
 402         int i;
 403
 404         for (i = 0; i < codec->hints.used; i++) {
 405                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 406                 if (!strcmp(hint->key, key))
 407                         return hint;
 408         }
 409         return NULL;
 410 }
 411
 412 static void remove_trail_spaces(char *str)
 413 {
 414         char *p;
 415         if (!*str)
 416                 return;
 417         p = str + strlen(str) - 1;
 418         for (; isspace(*p); p--) {
 419                 *p = 0;
 420                 if (p == str)
 421                         return;
 422         }
 423 }
 424
 425 #define MAX_HINTS       1024
 426
 427 static int parse_hints(struct hda_codec *codec, const char *buf)
 428 {
 429         char *key, *val;
 430         struct hda_hint *hint;
 431
 432         buf = skip_spaces(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         val = skip_spaces(val);
 448         remove_trail_spaces(key);
 449         remove_trail_spaces(val);
 450         hint = get_hint(codec, key);
 451         if (hint) {
 452                 /* replace */
 453                 kfree(hint->key);
 454                 hint->key = key;
 455                 hint->val = val;
 456                 return 0;
 457         }
 458         /* allocate a new hint entry */
 459         if (codec->hints.used >= MAX_HINTS)
 460                 hint = NULL;
 461         else
 462                 hint = snd_array_new(&codec->hints);
 463         if (!hint) {
 464                 kfree(key);
 465                 return -ENOMEM;
 466         }
 467         hint->key = key;
 468         hint->val = val;
 469         return 0;
 470 }
 471
 472 static ssize_t hints_store(struct device *dev,
 473                            struct device_attribute *attr,
 474                            const char *buf, size_t count)
 475 {
 476         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 477         struct hda_codec *codec = hwdep->private_data;
 478         int err = parse_hints(codec, buf);
 479         if (err < 0)
 480                 return err;
 481         return count;
 482 }
 483
 484 static ssize_t pin_configs_show(struct hda_codec *codec,
 485                                 struct snd_array *list,
 486                                 char *buf)
 487 {
 488         int i, len = 0;
 489         for (i = 0; i < list->used; i++) {
 490                 struct hda_pincfg *pin = snd_array_elem(list, i);
 491                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 492                                pin->nid, pin->cfg);
 493         }
 494         return len;
 495 }
 496
 497 static ssize_t init_pin_configs_show(struct device *dev,
 498                                      struct device_attribute *attr,
 499                                      char *buf)
 500 {
 501         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 502         struct hda_codec *codec = hwdep->private_data;
 503         return pin_configs_show(codec, &codec->init_pins, buf);
 504 }
 505
 506 static ssize_t user_pin_configs_show(struct device *dev,
 507                                      struct device_attribute *attr,
 508                                      char *buf)
 509 {
 510         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 511         struct hda_codec *codec = hwdep->private_data;
 512         return pin_configs_show(codec, &codec->user_pins, buf);
 513 }
 514
 515 static ssize_t driver_pin_configs_show(struct device *dev,
 516                                        struct device_attribute *attr,
 517                                        char *buf)
 518 {
 519         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 520         struct hda_codec *codec = hwdep->private_data;
 521         return pin_configs_show(codec, &codec->driver_pins, buf);
 522 }
 523
 524 #define MAX_PIN_CONFIGS         32
 525
 526 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 527 {
 528         int nid, cfg;
 529
 530         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 531                 return -EINVAL;
 532         if (!nid)
 533                 return -EINVAL;
 534         return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 535 }
 536
 537 static ssize_t user_pin_configs_store(struct device *dev,
 538                                       struct device_attribute *attr,
 539                                       const char *buf, size_t count)
 540 {
 541         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 542         struct hda_codec *codec = hwdep->private_data;
 543         int err = parse_user_pin_configs(codec, buf);
 544         if (err < 0)
 545                 return err;
 546         return count;
 547 }
 548
 549 #define CODEC_ATTR_RW(type) \
 550         __ATTR(type, 0644, type##_show, type##_store)
 551 #define CODEC_ATTR_RO(type) \
 552         __ATTR_RO(type)
 553 #define CODEC_ATTR_WO(type) \
 554         __ATTR(type, 0200, NULL, type##_store)
 555
 556 static struct device_attribute codec_attrs[] = {
 557         CODEC_ATTR_RW(vendor_id),
 558         CODEC_ATTR_RW(subsystem_id),
 559         CODEC_ATTR_RW(revision_id),
 560         CODEC_ATTR_RO(afg),
 561         CODEC_ATTR_RO(mfg),
 562         CODEC_ATTR_RW(vendor_name),
 563         CODEC_ATTR_RW(chip_name),
 564         CODEC_ATTR_RW(modelname),
 565         CODEC_ATTR_RW(init_verbs),
 566         CODEC_ATTR_RW(hints),
 567         CODEC_ATTR_RO(init_pin_configs),
 568         CODEC_ATTR_RW(user_pin_configs),
 569         CODEC_ATTR_RO(driver_pin_configs),
 570         CODEC_ATTR_WO(reconfig),
 571         CODEC_ATTR_WO(clear),
 572 };
 573
 574 /*
 575  * create sysfs files on hwdep directory
 576  */
 577 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 578 {
 579         struct snd_hwdep *hwdep = codec->hwdep;
 580         int i;
 581
 582         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 583                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 584                                           hwdep->device, &codec_attrs[i]);
 585         return 0;
 586 }
 587
 588 /*
 589  * Look for hint string
 590  */
 591 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 592 {
 593         struct hda_hint *hint = get_hint(codec, key);
 594         return hint ? hint->val : NULL;
 595 }
 596 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
 597
 598 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 599 {
 600         const char *p = snd_hda_get_hint(codec, key);
 601         if (!p || !*p)
 602                 return -ENOENT;
 603         switch (toupper(*p)) {
 604         case 'T': /* true */
 605         case 'Y': /* yes */
 606         case '1':
 607                 return 1;
 608         }
 609         return 0;
 610 }
 611 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
 612
 613 #endif /* CONFIG_SND_HDA_RECONFIG */
 614
 615 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 616
 617 /* parser mode */
 618 enum {
 619         LINE_MODE_NONE,
 620         LINE_MODE_CODEC,
 621         LINE_MODE_MODEL,
 622         LINE_MODE_PINCFG,
 623         LINE_MODE_VERB,
 624         LINE_MODE_HINT,
 625         NUM_LINE_MODES,
 626 };
 627
 628 static inline int strmatch(const char *a, const char *b)
 629 {
 630         return strnicmp(a, b, strlen(b)) == 0;
 631 }
 632
 633 /* parse the contents after the line "[codec]"
 634  * accept only the line with three numbers, and assign the current codec
 635  */
 636 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 637                              struct hda_codec **codecp)
 638 {
 639         unsigned int vendorid, subid, caddr;
 640         struct hda_codec *codec;
 641
 642         *codecp = NULL;
 643         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 644                 list_for_each_entry(codec, &bus->codec_list, list) {
 645                         if (codec->addr == caddr) {
 646                                 *codecp = codec;
 647                                 break;
 648                         }
 649                 }
 650         }
 651 }
 652
 653 /* parse the contents after the other command tags, [pincfg], [verb],
 654  * [hint] and [model]
 655  * just pass to the sysfs helper (only when any codec was specified)
 656  */
 657 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 658                               struct hda_codec **codecp)
 659 {
 660         if (!*codecp)
 661                 return;
 662         parse_user_pin_configs(*codecp, buf);
 663 }
 664
 665 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 666                             struct hda_codec **codecp)
 667 {
 668         if (!*codecp)
 669                 return;
 670         parse_init_verbs(*codecp, buf);
 671 }
 672
 673 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 674                             struct hda_codec **codecp)
 675 {
 676         if (!*codecp)
 677                 return;
 678         parse_hints(*codecp, buf);
 679 }
 680
 681 static void parse_model_mode(char *buf, struct hda_bus *bus,
 682                              struct hda_codec **codecp)
 683 {
 684         if (!*codecp)
 685                 return;
 686         kfree((*codecp)->modelname);
 687         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 688 }
 689
 690 struct hda_patch_item {
 691         const char *tag;
 692         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 693 };
 694
 695 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 696         [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode },
 697         [LINE_MODE_MODEL] = { "[model]", parse_model_mode },
 698         [LINE_MODE_VERB] = { "[verb]", parse_verb_mode },
 699         [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode },
 700         [LINE_MODE_HINT] = { "[hint]", parse_hint_mode },
 701 };
 702
 703 /* check the line starting with '[' -- change the parser mode accodingly */
 704 static int parse_line_mode(char *buf, struct hda_bus *bus)
 705 {
 706         int i;
 707         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 708                 if (!patch_items[i].tag)
 709                         continue;
 710                 if (strmatch(buf, patch_items[i].tag))
 711                         return i;
 712         }
 713         return LINE_MODE_NONE;
 714 }
 715
 716 /* copy one line from the buffer in fw, and update the fields in fw
 717  * return zero if it reaches to the end of the buffer, or non-zero
 718  * if successfully copied a line
 719  *
 720  * the spaces at the beginning and the end of the line are stripped
 721  */
 722 static int get_line_from_fw(char *buf, int size, struct firmware *fw)
 723 {
 724         int len;
 725         const char *p = fw->data;
 726         while (isspace(*p) && fw->size) {
 727                 p++;
 728                 fw->size--;
 729         }
 730         if (!fw->size)
 731                 return 0;
 732         if (size < fw->size)
 733                 size = fw->size;
 734
 735         for (len = 0; len < fw->size; len++) {
 736                 if (!*p)
 737                         break;
 738                 if (*p == '\n') {
 739                         p++;
 740                         len++;
 741                         break;
 742                 }
 743                 if (len < size)
 744                         *buf++ = *p++;
 745         }
 746         *buf = 0;
 747         fw->size -= len;
 748         fw->data = p;
 749         remove_trail_spaces(buf);
 750         return 1;
 751 }
 752
 753 /*
 754  * load a "patch" firmware file and parse it
 755  */
 756 int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
 757 {
 758         int err;
 759         const struct firmware *fw;
 760         struct firmware tmp;
 761         char buf[128];
 762         struct hda_codec *codec;
 763         int line_mode;
 764         struct device *dev = bus->card->dev;
 765
 766         if (snd_BUG_ON(!dev))
 767                 return -ENODEV;
 768         err = request_firmware(&fw, patch, dev);
 769         if (err < 0) {
 770                 printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
 771                        patch);
 772                 return err;
 773         }
 774
 775         tmp = *fw;
 776         line_mode = LINE_MODE_NONE;
 777         codec = NULL;
 778         while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
 779                 if (!*buf || *buf == '#' || *buf == '\n')
 780                         continue;
 781                 if (*buf == '[')
 782                         line_mode = parse_line_mode(buf, bus);
 783                 else if (patch_items[line_mode].parser)
 784                         patch_items[line_mode].parser(buf, bus, &codec);
 785         }
 786         release_firmware(fw);
 787         return 0;
 788 }
 789 EXPORT_SYMBOL_HDA(snd_hda_load_patch);
 790 #endif /* CONFIG_SND_HDA_PATCH_LOADER */