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   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 <sound/core.h>
  28 #include "hda_codec.h"
  29 #include "hda_local.h"
  30 #include <sound/hda_hwdep.h>
  31 #include <sound/minors.h>
  32
  33 /* hint string pair */
  34 struct hda_hint {
  35         const char *key;
  36         const char *val;        /* contained in the same alloc as key */
  37 };
  38
  39 /*
  40  * write/read an out-of-bound verb
  41  */
  42 static int verb_write_ioctl(struct hda_codec *codec,
  43                             struct hda_verb_ioctl __user *arg)
  44 {
  45         u32 verb, res;
  46
  47         if (get_user(verb, &arg->verb))
  48                 return -EFAULT;
  49         res = snd_hda_codec_read(codec, verb >> 24, 0,
  50                                  (verb >> 8) & 0xffff, verb & 0xff);
  51         if (put_user(res, &arg->res))
  52                 return -EFAULT;
  53         return 0;
  54 }
  55
  56 static int get_wcap_ioctl(struct hda_codec *codec,
  57                           struct hda_verb_ioctl __user *arg)
  58 {
  59         u32 verb, res;
  60
  61         if (get_user(verb, &arg->verb))
  62                 return -EFAULT;
  63         res = get_wcaps(codec, verb >> 24);
  64         if (put_user(res, &arg->res))
  65                 return -EFAULT;
  66         return 0;
  67 }
  68
  69
  70 /*
  71  */
  72 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  73                            unsigned int cmd, unsigned long arg)
  74 {
  75         struct hda_codec *codec = hw->private_data;
  76         void __user *argp = (void __user *)arg;
  77
  78         switch (cmd) {
  79         case HDA_IOCTL_PVERSION:
  80                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  81         case HDA_IOCTL_VERB_WRITE:
  82                 return verb_write_ioctl(codec, argp);
  83         case HDA_IOCTL_GET_WCAP:
  84                 return get_wcap_ioctl(codec, argp);
  85         }
  86         return -ENOIOCTLCMD;
  87 }
  88
  89 #ifdef CONFIG_COMPAT
  90 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  91                                   unsigned int cmd, unsigned long arg)
  92 {
  93         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  94 }
  95 #endif
  96
  97 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  98 {
  99 #ifndef CONFIG_SND_DEBUG_VERBOSE
 100         if (!capable(CAP_SYS_RAWIO))
 101                 return -EACCES;
 102 #endif
 103         return 0;
 104 }
 105
 106 static void clear_hwdep_elements(struct hda_codec *codec)
 107 {
 108         int i;
 109
 110         /* clear init verbs */
 111         snd_array_free(&codec->init_verbs);
 112         /* clear hints */
 113         for (i = 0; i < codec->hints.used; i++) {
 114                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 115                 kfree(hint->key); /* we don't need to free hint->val */
 116         }
 117         snd_array_free(&codec->hints);
 118         snd_array_free(&codec->user_pins);
 119 }
 120
 121 static void hwdep_free(struct snd_hwdep *hwdep)
 122 {
 123         clear_hwdep_elements(hwdep->private_data);
 124 }
 125
 126 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 127 {
 128         char hwname[16];
 129         struct snd_hwdep *hwdep;
 130         int err;
 131
 132         sprintf(hwname, "HDA Codec %d", codec->addr);
 133         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 134         if (err < 0)
 135                 return err;
 136         codec->hwdep = hwdep;
 137         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 138         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 139         hwdep->private_data = codec;
 140         hwdep->private_free = hwdep_free;
 141         hwdep->exclusive = 1;
 142
 143         hwdep->ops.open = hda_hwdep_open;
 144         hwdep->ops.ioctl = hda_hwdep_ioctl;
 145 #ifdef CONFIG_COMPAT
 146         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 147 #endif
 148
 149         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 150         snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
 151         snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
 152
 153         return 0;
 154 }
 155
 156 #ifdef CONFIG_SND_HDA_RECONFIG
 157
 158 /*
 159  * sysfs interface
 160  */
 161
 162 static int clear_codec(struct hda_codec *codec)
 163 {
 164         int err;
 165
 166         err = snd_hda_codec_reset(codec);
 167         if (err < 0) {
 168                 snd_printk(KERN_ERR "The codec is being used, can't free.\n");
 169                 return err;
 170         }
 171         clear_hwdep_elements(codec);
 172         return 0;
 173 }
 174
 175 static int reconfig_codec(struct hda_codec *codec)
 176 {
 177         int err;
 178
 179         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 180         err = snd_hda_codec_reset(codec);
 181         if (err < 0) {
 182                 snd_printk(KERN_ERR
 183                            "The codec is being used, can't reconfigure.\n");
 184                 return err;
 185         }
 186         err = snd_hda_codec_configure(codec);
 187         if (err < 0)
 188                 return err;
 189         /* rebuild PCMs */
 190         err = snd_hda_codec_build_pcms(codec);
 191         if (err < 0)
 192                 return err;
 193         /* rebuild mixers */
 194         err = snd_hda_codec_build_controls(codec);
 195         if (err < 0)
 196                 return err;
 197         return snd_card_register(codec->bus->card);
 198 }
 199
 200 /*
 201  * allocate a string at most len chars, and remove the trailing EOL
 202  */
 203 static char *kstrndup_noeol(const char *src, size_t len)
 204 {
 205         char *s = kstrndup(src, len, GFP_KERNEL);
 206         char *p;
 207         if (!s)
 208                 return NULL;
 209         p = strchr(s, '\n');
 210         if (p)
 211                 *p = 0;
 212         return s;
 213 }
 214
 215 #define CODEC_INFO_SHOW(type)                                   \
 216 static ssize_t type##_show(struct device *dev,                  \
 217                            struct device_attribute *attr,       \
 218                            char *buf)                           \
 219 {                                                               \
 220         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 221         struct hda_codec *codec = hwdep->private_data;          \
 222         return sprintf(buf, "0x%x\n", codec->type);             \
 223 }
 224
 225 #define CODEC_INFO_STR_SHOW(type)                               \
 226 static ssize_t type##_show(struct device *dev,                  \
 227                              struct device_attribute *attr,     \
 228                                         char *buf)              \
 229 {                                                               \
 230         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 231         struct hda_codec *codec = hwdep->private_data;          \
 232         return sprintf(buf, "%s\n",                             \
 233                        codec->type ? codec->type : "");         \
 234 }
 235
 236 CODEC_INFO_SHOW(vendor_id);
 237 CODEC_INFO_SHOW(subsystem_id);
 238 CODEC_INFO_SHOW(revision_id);
 239 CODEC_INFO_SHOW(afg);
 240 CODEC_INFO_SHOW(mfg);
 241 CODEC_INFO_STR_SHOW(name);
 242 CODEC_INFO_STR_SHOW(modelname);
 243
 244 #define CODEC_INFO_STORE(type)                                  \
 245 static ssize_t type##_store(struct device *dev,                 \
 246                             struct device_attribute *attr,      \
 247                             const char *buf, size_t count)      \
 248 {                                                               \
 249         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 250         struct hda_codec *codec = hwdep->private_data;          \
 251         char *after;                                            \
 252         codec->type = simple_strtoul(buf, &after, 0);           \
 253         return count;                                           \
 254 }
 255
 256 #define CODEC_INFO_STR_STORE(type)                              \
 257 static ssize_t type##_store(struct device *dev,                 \
 258                             struct device_attribute *attr,      \
 259                             const char *buf, size_t count)      \
 260 {                                                               \
 261         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 262         struct hda_codec *codec = hwdep->private_data;          \
 263         char *s = kstrndup_noeol(buf, 64);                      \
 264         if (!s)                                                 \
 265                 return -ENOMEM;                                 \
 266         kfree(codec->type);                                     \
 267         codec->type = s;                                        \
 268         return count;                                           \
 269 }
 270
 271 CODEC_INFO_STORE(vendor_id);
 272 CODEC_INFO_STORE(subsystem_id);
 273 CODEC_INFO_STORE(revision_id);
 274 CODEC_INFO_STR_STORE(name);
 275 CODEC_INFO_STR_STORE(modelname);
 276
 277 #define CODEC_ACTION_STORE(type)                                \
 278 static ssize_t type##_store(struct device *dev,                 \
 279                             struct device_attribute *attr,      \
 280                             const char *buf, size_t count)      \
 281 {                                                               \
 282         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 283         struct hda_codec *codec = hwdep->private_data;          \
 284         int err = 0;                                            \
 285         if (*buf)                                               \
 286                 err = type##_codec(codec);                      \
 287         return err < 0 ? err : count;                           \
 288 }
 289
 290 CODEC_ACTION_STORE(reconfig);
 291 CODEC_ACTION_STORE(clear);
 292
 293 static ssize_t init_verbs_show(struct device *dev,
 294                                struct device_attribute *attr,
 295                                char *buf)
 296 {
 297         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 298         struct hda_codec *codec = hwdep->private_data;
 299         int i, len = 0;
 300         for (i = 0; i < codec->init_verbs.used; i++) {
 301                 struct hda_verb *v = snd_array_elem(&codec->init_verbs, i);
 302                 len += snprintf(buf + len, PAGE_SIZE - len,
 303                                 "0x%02x 0x%03x 0x%04x\n",
 304                                 v->nid, v->verb, v->param);
 305         }
 306         return len;
 307 }
 308
 309 static ssize_t init_verbs_store(struct device *dev,
 310                                 struct device_attribute *attr,
 311                                 const char *buf, size_t count)
 312 {
 313         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 314         struct hda_codec *codec = hwdep->private_data;
 315         struct hda_verb *v;
 316         int nid, verb, param;
 317
 318         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 319                 return -EINVAL;
 320         if (!nid || !verb)
 321                 return -EINVAL;
 322         v = snd_array_new(&codec->init_verbs);
 323         if (!v)
 324                 return -ENOMEM;
 325         v->nid = nid;
 326         v->verb = verb;
 327         v->param = param;
 328         return count;
 329 }
 330
 331 static ssize_t hints_show(struct device *dev,
 332                           struct device_attribute *attr,
 333                           char *buf)
 334 {
 335         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 336         struct hda_codec *codec = hwdep->private_data;
 337         int i, len = 0;
 338         for (i = 0; i < codec->hints.used; i++) {
 339                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 340                 len += snprintf(buf + len, PAGE_SIZE - len,
 341                                 "%s = %s\n", hint->key, hint->val);
 342         }
 343         return len;
 344 }
 345
 346 static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
 347 {
 348         int i;
 349
 350         for (i = 0; i < codec->hints.used; i++) {
 351                 struct hda_hint *hint = snd_array_elem(&codec->hints, i);
 352                 if (!strcmp(hint->key, key))
 353                         return hint;
 354         }
 355         return NULL;
 356 }
 357
 358 static void remove_trail_spaces(char *str)
 359 {
 360         char *p;
 361         if (!*str)
 362                 return;
 363         p = str + strlen(str) - 1;
 364         for (; isspace(*p); p--) {
 365                 *p = 0;
 366                 if (p == str)
 367                         return;
 368         }
 369 }
 370
 371 #define MAX_HINTS       1024
 372
 373 static ssize_t hints_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         char *key, *val;
 380         struct hda_hint *hint;
 381
 382         while (isspace(*buf))
 383                 buf++;
 384         if (!*buf || *buf == '#' || *buf == '\n')
 385                 return count;
 386         if (*buf == '=')
 387                 return -EINVAL;
 388         key = kstrndup_noeol(buf, 1024);
 389         if (!key)
 390                 return -ENOMEM;
 391         /* extract key and val */
 392         val = strchr(key, '=');
 393         if (!val) {
 394                 kfree(key);
 395                 return -EINVAL;
 396         }
 397         *val++ = 0;
 398         while (isspace(*val))
 399                 val++;
 400         remove_trail_spaces(key);
 401         remove_trail_spaces(val);
 402         hint = get_hint(codec, key);
 403         if (hint) {
 404                 /* replace */
 405                 kfree(hint->key);
 406                 hint->key = key;
 407                 hint->val = val;
 408                 return count;
 409         }
 410         /* allocate a new hint entry */
 411         if (codec->hints.used >= MAX_HINTS)
 412                 hint = NULL;
 413         else
 414                 hint = snd_array_new(&codec->hints);
 415         if (!hint) {
 416                 kfree(key);
 417                 return -ENOMEM;
 418         }
 419         hint->key = key;
 420         hint->val = val;
 421         return count;
 422 }
 423
 424 static ssize_t pin_configs_show(struct hda_codec *codec,
 425                                 struct snd_array *list,
 426                                 char *buf)
 427 {
 428         int i, len = 0;
 429         for (i = 0; i < list->used; i++) {
 430                 struct hda_pincfg *pin = snd_array_elem(list, i);
 431                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 432                                pin->nid, pin->cfg);
 433         }
 434         return len;
 435 }
 436
 437 static ssize_t init_pin_configs_show(struct device *dev,
 438                                      struct device_attribute *attr,
 439                                      char *buf)
 440 {
 441         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 442         struct hda_codec *codec = hwdep->private_data;
 443         return pin_configs_show(codec, &codec->init_pins, buf);
 444 }
 445
 446 static ssize_t user_pin_configs_show(struct device *dev,
 447                                      struct device_attribute *attr,
 448                                      char *buf)
 449 {
 450         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 451         struct hda_codec *codec = hwdep->private_data;
 452         return pin_configs_show(codec, &codec->user_pins, buf);
 453 }
 454
 455 static ssize_t driver_pin_configs_show(struct device *dev,
 456                                        struct device_attribute *attr,
 457                                        char *buf)
 458 {
 459         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 460         struct hda_codec *codec = hwdep->private_data;
 461         return pin_configs_show(codec, &codec->driver_pins, buf);
 462 }
 463
 464 #define MAX_PIN_CONFIGS         32
 465
 466 static ssize_t user_pin_configs_store(struct device *dev,
 467                                       struct device_attribute *attr,
 468                                       const char *buf, size_t count)
 469 {
 470         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 471         struct hda_codec *codec = hwdep->private_data;
 472         int nid, cfg;
 473         int err;
 474
 475         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 476                 return -EINVAL;
 477         if (!nid)
 478                 return -EINVAL;
 479         err = snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
 480         if (err < 0)
 481                 return err;
 482         return count;
 483 }
 484
 485 #define CODEC_ATTR_RW(type) \
 486         __ATTR(type, 0644, type##_show, type##_store)
 487 #define CODEC_ATTR_RO(type) \
 488         __ATTR_RO(type)
 489 #define CODEC_ATTR_WO(type) \
 490         __ATTR(type, 0200, NULL, type##_store)
 491
 492 static struct device_attribute codec_attrs[] = {
 493         CODEC_ATTR_RW(vendor_id),
 494         CODEC_ATTR_RW(subsystem_id),
 495         CODEC_ATTR_RW(revision_id),
 496         CODEC_ATTR_RO(afg),
 497         CODEC_ATTR_RO(mfg),
 498         CODEC_ATTR_RW(name),
 499         CODEC_ATTR_RW(modelname),
 500         CODEC_ATTR_RW(init_verbs),
 501         CODEC_ATTR_RW(hints),
 502         CODEC_ATTR_RO(init_pin_configs),
 503         CODEC_ATTR_RW(user_pin_configs),
 504         CODEC_ATTR_RO(driver_pin_configs),
 505         CODEC_ATTR_WO(reconfig),
 506         CODEC_ATTR_WO(clear),
 507 };
 508
 509 /*
 510  * create sysfs files on hwdep directory
 511  */
 512 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 513 {
 514         struct snd_hwdep *hwdep = codec->hwdep;
 515         int i;
 516
 517         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 518                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 519                                           hwdep->device, &codec_attrs[i]);
 520         return 0;
 521 }
 522
 523 /*
 524  * Look for hint string
 525  */
 526 const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
 527 {
 528         struct hda_hint *hint = get_hint(codec, key);
 529         return hint ? hint->val : NULL;
 530 }
 531 EXPORT_SYMBOL_HDA(snd_hda_get_hint);
 532
 533 int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
 534 {
 535         const char *p = snd_hda_get_hint(codec, key);
 536         if (!p || !*p)
 537                 return -ENOENT;
 538         switch (toupper(*p)) {
 539         case 'T': /* true */
 540         case 'Y': /* yes */
 541         case '1':
 542                 return 1;
 543         }
 544         return 0;
 545 }
 546 EXPORT_SYMBOL_HDA(snd_hda_get_bool_hint);
 547
 548 #endif /* CONFIG_SND_HDA_RECONFIG */