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 <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 /*
  34  * write/read an out-of-bound verb
  35  */
  36 static int verb_write_ioctl(struct hda_codec *codec,
  37                             struct hda_verb_ioctl __user *arg)
  38 {
  39         u32 verb, res;
  40
  41         if (get_user(verb, &arg->verb))
  42                 return -EFAULT;
  43         res = snd_hda_codec_read(codec, verb >> 24, 0,
  44                                  (verb >> 8) & 0xffff, verb & 0xff);
  45         if (put_user(res, &arg->res))
  46                 return -EFAULT;
  47         return 0;
  48 }
  49
  50 static int get_wcap_ioctl(struct hda_codec *codec,
  51                           struct hda_verb_ioctl __user *arg)
  52 {
  53         u32 verb, res;
  54
  55         if (get_user(verb, &arg->verb))
  56                 return -EFAULT;
  57         res = get_wcaps(codec, verb >> 24);
  58         if (put_user(res, &arg->res))
  59                 return -EFAULT;
  60         return 0;
  61 }
  62
  63
  64 /*
  65  */
  66 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  67                            unsigned int cmd, unsigned long arg)
  68 {
  69         struct hda_codec *codec = hw->private_data;
  70         void __user *argp = (void __user *)arg;
  71
  72         switch (cmd) {
  73         case HDA_IOCTL_PVERSION:
  74                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  75         case HDA_IOCTL_VERB_WRITE:
  76                 return verb_write_ioctl(codec, argp);
  77         case HDA_IOCTL_GET_WCAP:
  78                 return get_wcap_ioctl(codec, argp);
  79         }
  80         return -ENOIOCTLCMD;
  81 }
  82
  83 #ifdef CONFIG_COMPAT
  84 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  85                                   unsigned int cmd, unsigned long arg)
  86 {
  87         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  88 }
  89 #endif
  90
  91 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  92 {
  93 #ifndef CONFIG_SND_DEBUG_VERBOSE
  94         if (!capable(CAP_SYS_RAWIO))
  95                 return -EACCES;
  96 #endif
  97         return 0;
  98 }
  99
 100 static void clear_hwdep_elements(struct hda_codec *codec)
 101 {
 102         char **head;
 103         int i;
 104
 105         /* clear init verbs */
 106         snd_array_free(&codec->init_verbs);
 107         /* clear hints */
 108         head = codec->hints.list;
 109         for (i = 0; i < codec->hints.used; i++, head++)
 110                 kfree(*head);
 111         snd_array_free(&codec->hints);
 112         snd_array_free(&codec->override_pins);
 113 }
 114
 115 static void hwdep_free(struct snd_hwdep *hwdep)
 116 {
 117         clear_hwdep_elements(hwdep->private_data);
 118 }
 119
 120 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 121 {
 122         char hwname[16];
 123         struct snd_hwdep *hwdep;
 124         int err;
 125
 126         sprintf(hwname, "HDA Codec %d", codec->addr);
 127         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 128         if (err < 0)
 129                 return err;
 130         codec->hwdep = hwdep;
 131         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 132         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 133         hwdep->private_data = codec;
 134         hwdep->private_free = hwdep_free;
 135         hwdep->exclusive = 1;
 136
 137         hwdep->ops.open = hda_hwdep_open;
 138         hwdep->ops.ioctl = hda_hwdep_ioctl;
 139 #ifdef CONFIG_COMPAT
 140         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 141 #endif
 142
 143         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 144         snd_array_init(&codec->hints, sizeof(char *), 32);
 145         snd_array_init(&codec->override_pins, sizeof(struct hda_pincfg), 16);
 146
 147         return 0;
 148 }
 149
 150 #ifdef CONFIG_SND_HDA_RECONFIG
 151
 152 /*
 153  * sysfs interface
 154  */
 155
 156 static int clear_codec(struct hda_codec *codec)
 157 {
 158         snd_hda_codec_reset(codec);
 159         clear_hwdep_elements(codec);
 160         return 0;
 161 }
 162
 163 static int reconfig_codec(struct hda_codec *codec)
 164 {
 165         int err;
 166
 167         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 168         snd_hda_codec_reset(codec);
 169         err = snd_hda_codec_configure(codec);
 170         if (err < 0)
 171                 return err;
 172         /* rebuild PCMs */
 173         err = snd_hda_codec_build_pcms(codec);
 174         if (err < 0)
 175                 return err;
 176         /* rebuild mixers */
 177         err = snd_hda_codec_build_controls(codec);
 178         if (err < 0)
 179                 return err;
 180         return snd_card_register(codec->bus->card);
 181 }
 182
 183 /*
 184  * allocate a string at most len chars, and remove the trailing EOL
 185  */
 186 static char *kstrndup_noeol(const char *src, size_t len)
 187 {
 188         char *s = kstrndup(src, len, GFP_KERNEL);
 189         char *p;
 190         if (!s)
 191                 return NULL;
 192         p = strchr(s, '\n');
 193         if (p)
 194                 *p = 0;
 195         return s;
 196 }
 197
 198 #define CODEC_INFO_SHOW(type)                                   \
 199 static ssize_t type##_show(struct device *dev,                  \
 200                            struct device_attribute *attr,       \
 201                            char *buf)                           \
 202 {                                                               \
 203         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 204         struct hda_codec *codec = hwdep->private_data;          \
 205         return sprintf(buf, "0x%x\n", codec->type);             \
 206 }
 207
 208 #define CODEC_INFO_STR_SHOW(type)                               \
 209 static ssize_t type##_show(struct device *dev,                  \
 210                              struct device_attribute *attr,     \
 211                                         char *buf)              \
 212 {                                                               \
 213         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 214         struct hda_codec *codec = hwdep->private_data;          \
 215         return sprintf(buf, "%s\n",                             \
 216                        codec->type ? codec->type : "");         \
 217 }
 218
 219 CODEC_INFO_SHOW(vendor_id);
 220 CODEC_INFO_SHOW(subsystem_id);
 221 CODEC_INFO_SHOW(revision_id);
 222 CODEC_INFO_SHOW(afg);
 223 CODEC_INFO_SHOW(mfg);
 224 CODEC_INFO_STR_SHOW(name);
 225 CODEC_INFO_STR_SHOW(modelname);
 226
 227 #define CODEC_INFO_STORE(type)                                  \
 228 static ssize_t type##_store(struct device *dev,                 \
 229                             struct device_attribute *attr,      \
 230                             const char *buf, size_t count)      \
 231 {                                                               \
 232         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 233         struct hda_codec *codec = hwdep->private_data;          \
 234         char *after;                                            \
 235         codec->type = simple_strtoul(buf, &after, 0);           \
 236         return count;                                           \
 237 }
 238
 239 #define CODEC_INFO_STR_STORE(type)                              \
 240 static ssize_t type##_store(struct device *dev,                 \
 241                             struct device_attribute *attr,      \
 242                             const char *buf, size_t count)      \
 243 {                                                               \
 244         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 245         struct hda_codec *codec = hwdep->private_data;          \
 246         char *s = kstrndup_noeol(buf, 64);                      \
 247         if (!s)                                                 \
 248                 return -ENOMEM;                                 \
 249         kfree(codec->type);                                     \
 250         codec->type = s;                                        \
 251         return count;                                           \
 252 }
 253
 254 CODEC_INFO_STORE(vendor_id);
 255 CODEC_INFO_STORE(subsystem_id);
 256 CODEC_INFO_STORE(revision_id);
 257 CODEC_INFO_STR_STORE(name);
 258 CODEC_INFO_STR_STORE(modelname);
 259
 260 #define CODEC_ACTION_STORE(type)                                \
 261 static ssize_t type##_store(struct device *dev,                 \
 262                             struct device_attribute *attr,      \
 263                             const char *buf, size_t count)      \
 264 {                                                               \
 265         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 266         struct hda_codec *codec = hwdep->private_data;          \
 267         int err = 0;                                            \
 268         if (*buf)                                               \
 269                 err = type##_codec(codec);                      \
 270         return err < 0 ? err : count;                           \
 271 }
 272
 273 CODEC_ACTION_STORE(reconfig);
 274 CODEC_ACTION_STORE(clear);
 275
 276 static ssize_t init_verbs_store(struct device *dev,
 277                                 struct device_attribute *attr,
 278                                 const char *buf, size_t count)
 279 {
 280         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 281         struct hda_codec *codec = hwdep->private_data;
 282         struct hda_verb *v;
 283         int nid, verb, param;
 284
 285         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 286                 return -EINVAL;
 287         if (!nid || !verb)
 288                 return -EINVAL;
 289         v = snd_array_new(&codec->init_verbs);
 290         if (!v)
 291                 return -ENOMEM;
 292         v->nid = nid;
 293         v->verb = verb;
 294         v->param = param;
 295         return count;
 296 }
 297
 298 static ssize_t hints_store(struct device *dev,
 299                            struct device_attribute *attr,
 300                            const char *buf, size_t count)
 301 {
 302         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 303         struct hda_codec *codec = hwdep->private_data;
 304         char *p;
 305         char **hint;
 306
 307         if (!*buf || isspace(*buf) || *buf == '#' || *buf == '\n')
 308                 return count;
 309         p = kstrndup_noeol(buf, 1024);
 310         if (!p)
 311                 return -ENOMEM;
 312         hint = snd_array_new(&codec->hints);
 313         if (!hint) {
 314                 kfree(p);
 315                 return -ENOMEM;
 316         }
 317         *hint = p;
 318         return count;
 319 }
 320
 321 static ssize_t pin_configs_show(struct hda_codec *codec,
 322                                 struct snd_array *list,
 323                                 char *buf)
 324 {
 325         int i, len = 0;
 326         for (i = 0; i < list->used; i++) {
 327                 struct hda_pincfg *pin = snd_array_elem(list, i);
 328                 len += sprintf(buf + len, "0x%02x 0x%08x\n",
 329                                pin->nid, pin->cfg);
 330         }
 331         return len;
 332 }
 333
 334 static ssize_t init_pin_configs_show(struct device *dev,
 335                                      struct device_attribute *attr,
 336                                      char *buf)
 337 {
 338         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 339         struct hda_codec *codec = hwdep->private_data;
 340         return pin_configs_show(codec, &codec->init_pins, buf);
 341 }
 342
 343 static ssize_t override_pin_configs_show(struct device *dev,
 344                                          struct device_attribute *attr,
 345                                          char *buf)
 346 {
 347         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 348         struct hda_codec *codec = hwdep->private_data;
 349         return pin_configs_show(codec, &codec->override_pins, buf);
 350 }
 351
 352 static ssize_t cur_pin_configs_show(struct device *dev,
 353                                     struct device_attribute *attr,
 354                                     char *buf)
 355 {
 356         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 357         struct hda_codec *codec = hwdep->private_data;
 358         return pin_configs_show(codec, &codec->cur_pins, buf);
 359 }
 360
 361 #define MAX_PIN_CONFIGS         32
 362
 363 static ssize_t override_pin_configs_store(struct device *dev,
 364                                           struct device_attribute *attr,
 365                                           const char *buf, size_t count)
 366 {
 367         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 368         struct hda_codec *codec = hwdep->private_data;
 369         int nid, cfg;
 370         int err;
 371
 372         if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
 373                 return -EINVAL;
 374         if (!nid)
 375                 return -EINVAL;
 376         err = snd_hda_add_pincfg(codec, &codec->override_pins, nid, cfg);
 377         if (err < 0)
 378                 return err;
 379         return count;
 380 }
 381
 382 #define CODEC_ATTR_RW(type) \
 383         __ATTR(type, 0644, type##_show, type##_store)
 384 #define CODEC_ATTR_RO(type) \
 385         __ATTR_RO(type)
 386 #define CODEC_ATTR_WO(type) \
 387         __ATTR(type, 0200, NULL, type##_store)
 388
 389 static struct device_attribute codec_attrs[] = {
 390         CODEC_ATTR_RW(vendor_id),
 391         CODEC_ATTR_RW(subsystem_id),
 392         CODEC_ATTR_RW(revision_id),
 393         CODEC_ATTR_RO(afg),
 394         CODEC_ATTR_RO(mfg),
 395         CODEC_ATTR_RW(name),
 396         CODEC_ATTR_RW(modelname),
 397         CODEC_ATTR_WO(init_verbs),
 398         CODEC_ATTR_WO(hints),
 399         CODEC_ATTR_RO(init_pin_configs),
 400         CODEC_ATTR_RW(override_pin_configs),
 401         CODEC_ATTR_RO(cur_pin_configs),
 402         CODEC_ATTR_WO(reconfig),
 403         CODEC_ATTR_WO(clear),
 404 };
 405
 406 /*
 407  * create sysfs files on hwdep directory
 408  */
 409 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 410 {
 411         struct snd_hwdep *hwdep = codec->hwdep;
 412         int i;
 413
 414         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 415                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 416                                           hwdep->device, &codec_attrs[i]);
 417         return 0;
 418 }
 419
 420 #endif /* CONFIG_SND_HDA_RECONFIG */