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/export.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_PM
 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_PM */
 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         unsigned long val;                                      \
 297         int err = strict_strtoul(buf, 0, &val);                 \
 298         if (err < 0)                                            \
 299                 return err;                                     \
 300         codec->type = val;                                      \
 301         return count;                                           \
 302 }
 303
 304 #define CODEC_INFO_STR_STORE(type)                              \
 305 static ssize_t type##_store(struct device *dev,                 \
 306                             struct device_attribute *attr,      \
 307                             const char *buf, size_t count)      \
 308 {                                                               \
 309         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 310         struct hda_codec *codec = hwdep->private_data;          \
 311         char *s = kstrndup_noeol(buf, 64);                      \
 312         if (!s)                                                 \
 313                 return -ENOMEM;                                 \
 314         kfree(codec->type);                                     \
 315         codec->type = s;                                        \
 316         return count;                                           \
 317 }
 318
 319 CODEC_INFO_STORE(vendor_id);
 320 CODEC_INFO_STORE(subsystem_id);
 321 CODEC_INFO_STORE(revision_id);
 322 CODEC_INFO_STR_STORE(vendor_name);
 323 CODEC_INFO_STR_STORE(chip_name);
 324 CODEC_INFO_STR_STORE(modelname);
 325
 326 #define CODEC_ACTION_STORE(type)                                \
 327 static ssize_t type##_store(struct device *dev,                 \
 328                             struct device_attribute *attr,      \
 329                             const char *buf, size_t count)      \
 330 {                                                               \
 331         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 332         struct hda_codec *codec = hwdep->private_data;          \
 333         int err = 0;                                            \
 334         if (*buf)                                               \
 335                 err = type##_codec(codec);                      \
 336         return err < 0 ? err : count;                           \
 337 }
 338
 339 CODEC_ACTION_STORE(reconfig);
 340 CODEC_ACTION_STORE(clear);
 341
 342 static ssize_t init_verbs_show(struct device *dev,
 343                                struct device_attribute *attr,
 344                                char *buf)
 345 {
 346         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 347         struct hda_codec *codec = hwdep->private_data;
 348         int i, len = 0;
 349         for (i = 0; i < codec->init_verbs.used; i++) {
 350                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 351                 len += snprintf(buf + len, PAGE_SIZE - len,
 352                                 "0x%02x 0x%03x 0x%04x\n",
 353                                 v->nid, v->verb, v->param);
 354         }
 355         return len;
 356 }
 357
 358 static int parse_init_verbs(struct hda_codec *codec, const char *buf)
 359 {
 360         struct hda_verb *v;
 361         int nid, verb, param;
 362
 363         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 364                 return -EINVAL;
 365         if (!nid || !verb)
 366                 return -EINVAL;
 367         v = snd_array_new(&codec->init_verbs);
 368         if (!v)
 369                 return -ENOMEM;
 370         v->nid = nid;
 371         v->verb = verb;
 372         v->param = param;
 373         return 0;
 374 }
 375
 376 static ssize_t init_verbs_store(struct device *dev,
 377                                 struct device_attribute *attr,
 378                                 const char *buf, size_t count)
 379 {
 380         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 381         struct hda_codec *codec = hwdep->private_data;
 382         int err = parse_init_verbs(codec, buf);
 383         if (err < 0)
 384                 return err;
 385         return count;
 386 }
 387
 388 static ssize_t hints_show(struct device *dev,
 389                           struct device_attribute *attr,
 390                           char *buf)
 391 {
 392         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 393         struct hda_codec *codec = hwdep->private_data;
 394         int i, len = 0;
 395         for (i = 0; i < codec->hints.used; i++) {
 396                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 397                 len += snprintf(buf + len, PAGE_SIZE - len,
 398                                 "%s = %s\n", hint->key, hint->val);
 399         }
 400         return len;
 401 }
 402
 403 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 404 {
 405         int i;
 406
 407         for (i = 0; i < codec->hints.used; i++) {
 408                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 409                 if (!strcmp(hint->key, key))
 410                         return hint;
 411         }
 412         return NULL;
 413 }
 414
 415 static void remove_trail_spaces(char *str)
 416 {
 417         char *p;
 418         if (!*str)
 419                 return;
 420         p = str + strlen(str) - 1;
 421         for (; isspace(*p); p--) {
 422                 *p = 0;
 423                 if (p == str)
 424                         return;
 425         }
 426 }
 427
 428 #define MAX_HINTS       1024
 429
 430 static int parse_hints(struct hda_codec *codec, const char *buf)
 431 {
 432         char *key, *val;
 433         struct hda_hint *hint;
 434
 435         buf = skip_spaces(buf);
 436         if (!*buf || *buf == '#' || *buf == '\n')
 437                 return 0;
 438         if (*buf == '=')
 439                 return -EINVAL;
 440         key = kstrndup_noeol(buf, 1024);
 441         if (!key)
 442                 return -ENOMEM;
 443         /* extract key and val */
 444         val = strchr(key, '=');
 445         if (!val) {
 446                 kfree(key);
 447                 return -EINVAL;
 448         }
 449         *val++ = 0;
 450         val = skip_spaces(val);
 451         remove_trail_spaces(key);
 452         remove_trail_spaces(val);
 453         hint = get_hint(codec, key);
 454         if (hint) {
 455                 /* replace */
 456                 kfree(hint->key);
 457                 hint->key = key;
 458                 hint->val = val;
 459                 return 0;
 460         }
 461         /* allocate a new hint entry */
 462         if (codec->hints.used >= MAX_HINTS)
 463                 hint = NULL;
 464         else
 465                 hint = snd_array_new(&codec->hints);
 466         if (!hint) {
 467                 kfree(key);
 468                 return -ENOMEM;
 469         }
 470         hint->key = key;
 471         hint->val = val;
 472         return 0;
 473 }
 474
 475 static ssize_t hints_store(struct device *dev,
 476                            struct device_attribute *attr,
 477                            const char *buf, size_t count)
 478 {
 479         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 480         struct hda_codec *codec = hwdep->private_data;
 481         int err = parse_hints(codec, buf);
 482         if (err < 0)
 483                 return err;
 484         return count;
 485 }
 486
 487 static ssize_t pin_configs_show(struct hda_codec *codec,
 488                                 struct snd_array *list,
 489                                 char *buf)
 490 {
 491         int i, len = 0;
 492         for (i = 0; i < list->used; i++) {
 493                 struct hda_pincfg *pin = snd_array_elem(list, i);
 494                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 495                                pin->nid, pin->cfg);
 496         }
 497         return len;
 498 }
 499
 500 static ssize_t init_pin_configs_show(struct device *dev,
 501                                      struct device_attribute *attr,
 502                                      char *buf)
 503 {
 504         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 505         struct hda_codec *codec = hwdep->private_data;
 506         return pin_configs_show(codec, &codec->init_pins, buf);
 507 }
 508
 509 static ssize_t user_pin_configs_show(struct device *dev,
 510                                      struct device_attribute *attr,
 511                                      char *buf)
 512 {
 513         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 514         struct hda_codec *codec = hwdep->private_data;
 515         return pin_configs_show(codec, &codec->user_pins, buf);
 516 }
 517
 518 static ssize_t driver_pin_configs_show(struct device *dev,
 519                                        struct device_attribute *attr,
 520                                        char *buf)
 521 {
 522         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 523         struct hda_codec *codec = hwdep->private_data;
 524         return pin_configs_show(codec, &codec->driver_pins, buf);
 525 }
 526
 527 #define MAX_PIN_CONFIGS         32
 528
 529 static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
 530 {
 531         int nid, cfg;
 532
 533         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 534                 return -EINVAL;
 535         if (!nid)
 536                 return -EINVAL;
 537         return snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 538 }
 539
 540 static ssize_t user_pin_configs_store(struct device *dev,
 541                                       struct device_attribute *attr,
 542                                       const char *buf, size_t count)
 543 {
 544         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 545         struct hda_codec *codec = hwdep->private_data;
 546         int err = parse_user_pin_configs(codec, buf);
 547         if (err < 0)
 548                 return err;
 549         return count;
 550 }
 551
 552 #define CODEC_ATTR_RW(type) \
 553         __ATTR(type, 0644, type##_show, type##_store)
 554 #define CODEC_ATTR_RO(type) \
 555         __ATTR_RO(type)
 556 #define CODEC_ATTR_WO(type) \
 557         __ATTR(type, 0200, NULL, type##_store)
 558
 559 static struct device_attribute codec_attrs[] = {
 560         CODEC_ATTR_RW(vendor_id),
 561         CODEC_ATTR_RW(subsystem_id),
 562         CODEC_ATTR_RW(revision_id),
 563         CODEC_ATTR_RO(afg),
 564         CODEC_ATTR_RO(mfg),
 565         CODEC_ATTR_RW(vendor_name),
 566         CODEC_ATTR_RW(chip_name),
 567         CODEC_ATTR_RW(modelname),
 568         CODEC_ATTR_RW(init_verbs),
 569         CODEC_ATTR_RW(hints),
 570         CODEC_ATTR_RO(init_pin_configs),
 571         CODEC_ATTR_RW(user_pin_configs),
 572         CODEC_ATTR_RO(driver_pin_configs),
 573         CODEC_ATTR_WO(reconfig),
 574         CODEC_ATTR_WO(clear),
 575 };
 576
 577 /*
 578  * create sysfs files on hwdep directory
 579  */
 580 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 581 {
 582         struct snd_hwdep *hwdep = codec->hwdep;
 583         int i;
 584
 585         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 586                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 587                                           hwdep->device, &codec_attrs[i]);
 588         return 0;
 589 }
 590
 591 /*
 592  * Look for hint string
 593  */
 594 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 595 {
 596         struct hda_hint *hint = get_hint(codec, key);
 597         return hint ? hint->val : NULL;
 598 }
 599 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
 600
 601 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 602 {
 603         const char *p = snd_hda_get_hint(codec, key);
 604         if (!p || !*p)
 605                 return -ENOENT;
 606         switch (toupper(*p)) {
 607         case 'T': /* true */
 608         case 'Y': /* yes */
 609         case '1':
 610                 return 1;
 611         }
 612         return 0;
 613 }
 614 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
 615
 616 #endif /* CONFIG_SND_HDA_RECONFIG */
 617
 618 #ifdef CONFIG_SND_HDA_PATCH_LOADER
 619
 620 /* parser mode */
 621 enum {
 622         LINE_MODE_NONE,
 623         LINE_MODE_CODEC,
 624         LINE_MODE_MODEL,
 625         LINE_MODE_PINCFG,
 626         LINE_MODE_VERB,
 627         LINE_MODE_HINT,
 628         LINE_MODE_VENDOR_ID,
 629         LINE_MODE_SUBSYSTEM_ID,
 630         LINE_MODE_REVISION_ID,
 631         LINE_MODE_CHIP_NAME,
 632         NUM_LINE_MODES,
 633 };
 634
 635 static inline int strmatch(const char *a, const char *b)
 636 {
 637         return strnicmp(a, b, strlen(b)) == 0;
 638 }
 639
 640 /* parse the contents after the line "[codec]"
 641  * accept only the line with three numbers, and assign the current codec
 642  */
 643 static void parse_codec_mode(char *buf, struct hda_bus *bus,
 644                              struct hda_codec **codecp)
 645 {
 646         int vendorid, subid, caddr;
 647         struct hda_codec *codec;
 648
 649         *codecp = NULL;
 650         if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
 651                 list_for_each_entry(codec, &bus->codec_list, list) {
 652                         if ((vendorid <= 0 || codec->vendor_id == vendorid) &&
 653                             (subid <= 0 || codec->subsystem_id == subid) &&
 654                             codec->addr == caddr) {
 655                                 *codecp = codec;
 656                                 break;
 657                         }
 658                 }
 659         }
 660 }
 661
 662 /* parse the contents after the other command tags, [pincfg], [verb],
 663  * [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
 664  * just pass to the sysfs helper (only when any codec was specified)
 665  */
 666 static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
 667                               struct hda_codec **codecp)
 668 {
 669         parse_user_pin_configs(*codecp, buf);
 670 }
 671
 672 static void parse_verb_mode(char *buf, struct hda_bus *bus,
 673                             struct hda_codec **codecp)
 674 {
 675         parse_init_verbs(*codecp, buf);
 676 }
 677
 678 static void parse_hint_mode(char *buf, struct hda_bus *bus,
 679                             struct hda_codec **codecp)
 680 {
 681         parse_hints(*codecp, buf);
 682 }
 683
 684 static void parse_model_mode(char *buf, struct hda_bus *bus,
 685                              struct hda_codec **codecp)
 686 {
 687         kfree((*codecp)->modelname);
 688         (*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
 689 }
 690
 691 static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
 692                                  struct hda_codec **codecp)
 693 {
 694         kfree((*codecp)->chip_name);
 695         (*codecp)->chip_name = kstrdup(buf, GFP_KERNEL);
 696 }
 697
 698 #define DEFINE_PARSE_ID_MODE(name) \
 699 static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
 700                                  struct hda_codec **codecp) \
 701 { \
 702         unsigned long val; \
 703         if (!strict_strtoul(buf, 0, &val)) \
 704                 (*codecp)->name = val; \
 705 }
 706
 707 DEFINE_PARSE_ID_MODE(vendor_id);
 708 DEFINE_PARSE_ID_MODE(subsystem_id);
 709 DEFINE_PARSE_ID_MODE(revision_id);
 710
 711
 712 struct hda_patch_item {
 713         const char *tag;
 714         void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
 715         int need_codec;
 716 };
 717
 718 static struct hda_patch_item patch_items[NUM_LINE_MODES] = {
 719         [LINE_MODE_CODEC] = { "[codec]", parse_codec_mode, 0 },
 720         [LINE_MODE_MODEL] = { "[model]", parse_model_mode, 1 },
 721         [LINE_MODE_VERB] = { "[verb]", parse_verb_mode, 1 },
 722         [LINE_MODE_PINCFG] = { "[pincfg]", parse_pincfg_mode, 1 },
 723         [LINE_MODE_HINT] = { "[hint]", parse_hint_mode, 1 },
 724         [LINE_MODE_VENDOR_ID] = { "[vendor_id]", parse_vendor_id_mode, 1 },
 725         [LINE_MODE_SUBSYSTEM_ID] = { "[subsystem_id]", parse_subsystem_id_mode, 1 },
 726         [LINE_MODE_REVISION_ID] = { "[revision_id]", parse_revision_id_mode, 1 },
 727         [LINE_MODE_CHIP_NAME] = { "[chip_name]", parse_chip_name_mode, 1 },
 728 };
 729
 730 /* check the line starting with '[' -- change the parser mode accodingly */
 731 static int parse_line_mode(char *buf, struct hda_bus *bus)
 732 {
 733         int i;
 734         for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
 735                 if (!patch_items[i].tag)
 736                         continue;
 737                 if (strmatch(buf, patch_items[i].tag))
 738                         return i;
 739         }
 740         return LINE_MODE_NONE;
 741 }
 742
 743 /* copy one line from the buffer in fw, and update the fields in fw
 744  * return zero if it reaches to the end of the buffer, or non-zero
 745  * if successfully copied a line
 746  *
 747  * the spaces at the beginning and the end of the line are stripped
 748  */
 749 static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
 750                             const void **fw_data_p)
 751 {
 752         int len;
 753         size_t fw_size = *fw_size_p;
 754         const char *p = *fw_data_p;
 755
 756         while (isspace(*p) && fw_size) {
 757                 p++;
 758                 fw_size--;
 759         }
 760         if (!fw_size)
 761                 return 0;
 762
 763         for (len = 0; len < fw_size; len++) {
 764                 if (!*p)
 765                         break;
 766                 if (*p == '\n') {
 767                         p++;
 768                         len++;
 769                         break;
 770                 }
 771                 if (len < size)
 772                         *buf++ = *p++;
 773         }
 774         *buf = 0;
 775         *fw_size_p = fw_size - len;
 776         *fw_data_p = p;
 777         remove_trail_spaces(buf);
 778         return 1;
 779 }
 780
 781 /*
 782  * load a "patch" firmware file and parse it
 783  */
 784 int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
 785 {
 786         char buf[128];
 787         struct hda_codec *codec;
 788         int line_mode;
 789
 790         line_mode = LINE_MODE_NONE;
 791         codec = NULL;
 792         while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
 793                 if (!*buf || *buf == '#' || *buf == '\n')
 794                         continue;
 795                 if (*buf == '[')
 796                         line_mode = parse_line_mode(buf, bus);
 797                 else if (patch_items[line_mode].parser &&
 798                          (codec || !patch_items[line_mode].need_codec))
 799                         patch_items[line_mode].parser(buf, bus, &codec);
 800         }
 801         return 0;
 802 }
 803 EXPORT_SYMBOL_HDA(snd_hda_load_patch);
 804 #endif /* CONFIG_SND_HDA_PATCH_LOADER */