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 }
 113
 114 static void hwdep_free(struct snd_hwdep *hwdep)
 115 {
 116         clear_hwdep_elements(hwdep->private_data);
 117 }
 118
 119 int /*__devinit*/ snd_hda_create_hwdep(struct hda_codec *codec)
 120 {
 121         char hwname[16];
 122         struct snd_hwdep *hwdep;
 123         int err;
 124
 125         sprintf(hwname, "HDA Codec %d", codec->addr);
 126         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 127         if (err < 0)
 128                 return err;
 129         codec->hwdep = hwdep;
 130         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 131         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 132         hwdep->private_data = codec;
 133         hwdep->private_free = hwdep_free;
 134         hwdep->exclusive = 1;
 135
 136         hwdep->ops.open = hda_hwdep_open;
 137         hwdep->ops.ioctl = hda_hwdep_ioctl;
 138 #ifdef CONFIG_COMPAT
 139         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 140 #endif
 141
 142         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 143         snd_array_init(&codec->hints, sizeof(char *), 32);
 144
 145         return 0;
 146 }
 147
 148 #ifdef CONFIG_SND_HDA_RECONFIG
 149
 150 /*
 151  * sysfs interface
 152  */
 153
 154 static int clear_codec(struct hda_codec *codec)
 155 {
 156         snd_hda_codec_reset(codec);
 157         clear_hwdep_elements(codec);
 158         return 0;
 159 }
 160
 161 static int reconfig_codec(struct hda_codec *codec)
 162 {
 163         int err;
 164
 165         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 166         snd_hda_codec_reset(codec);
 167         err = snd_hda_codec_configure(codec);
 168         if (err < 0)
 169                 return err;
 170         /* rebuild PCMs */
 171         err = snd_hda_codec_build_pcms(codec);
 172         if (err < 0)
 173                 return err;
 174         /* rebuild mixers */
 175         err = snd_hda_codec_build_controls(codec);
 176         if (err < 0)
 177                 return err;
 178         return snd_card_register(codec->bus->card);
 179 }
 180
 181 /*
 182  * allocate a string at most len chars, and remove the trailing EOL
 183  */
 184 static char *kstrndup_noeol(const char *src, size_t len)
 185 {
 186         char *s = kstrndup(src, len, GFP_KERNEL);
 187         char *p;
 188         if (!s)
 189                 return NULL;
 190         p = strchr(s, '\n');
 191         if (p)
 192                 *p = 0;
 193         return s;
 194 }
 195
 196 #define CODEC_INFO_SHOW(type)                                   \
 197 static ssize_t type##_show(struct device *dev,                  \
 198                            struct device_attribute *attr,       \
 199                            char *buf)                           \
 200 {                                                               \
 201         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 202         struct hda_codec *codec = hwdep->private_data;          \
 203         return sprintf(buf, "0x%x\n", codec->type);             \
 204 }
 205
 206 #define CODEC_INFO_STR_SHOW(type)                               \
 207 static ssize_t type##_show(struct device *dev,                  \
 208                              struct device_attribute *attr,     \
 209                                         char *buf)              \
 210 {                                                               \
 211         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 212         struct hda_codec *codec = hwdep->private_data;          \
 213         return sprintf(buf, "%s\n",                             \
 214                        codec->type ? codec->type : "");         \
 215 }
 216
 217 CODEC_INFO_SHOW(vendor_id);
 218 CODEC_INFO_SHOW(subsystem_id);
 219 CODEC_INFO_SHOW(revision_id);
 220 CODEC_INFO_SHOW(afg);
 221 CODEC_INFO_SHOW(mfg);
 222 CODEC_INFO_STR_SHOW(name);
 223 CODEC_INFO_STR_SHOW(modelname);
 224
 225 #define CODEC_INFO_STORE(type)                                  \
 226 static ssize_t type##_store(struct device *dev,                 \
 227                             struct device_attribute *attr,      \
 228                             const char *buf, size_t count)      \
 229 {                                                               \
 230         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 231         struct hda_codec *codec = hwdep->private_data;          \
 232         char *after;                                            \
 233         codec->type = simple_strtoul(buf, &after, 0);           \
 234         return count;                                           \
 235 }
 236
 237 #define CODEC_INFO_STR_STORE(type)                              \
 238 static ssize_t type##_store(struct device *dev,                 \
 239                             struct device_attribute *attr,      \
 240                             const char *buf, size_t count)      \
 241 {                                                               \
 242         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 243         struct hda_codec *codec = hwdep->private_data;          \
 244         char *s = kstrndup_noeol(buf, 64);                      \
 245         if (!s)                                                 \
 246                 return -ENOMEM;                                 \
 247         kfree(codec->type);                                     \
 248         codec->type = s;                                        \
 249         return count;                                           \
 250 }
 251
 252 CODEC_INFO_STORE(vendor_id);
 253 CODEC_INFO_STORE(subsystem_id);
 254 CODEC_INFO_STORE(revision_id);
 255 CODEC_INFO_STR_STORE(name);
 256 CODEC_INFO_STR_STORE(modelname);
 257
 258 #define CODEC_ACTION_STORE(type)                                \
 259 static ssize_t type##_store(struct device *dev,                 \
 260                             struct device_attribute *attr,      \
 261                             const char *buf, size_t count)      \
 262 {                                                               \
 263         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 264         struct hda_codec *codec = hwdep->private_data;          \
 265         int err = 0;                                            \
 266         if (*buf)                                               \
 267                 err = type##_codec(codec);                      \
 268         return err < 0 ? err : count;                           \
 269 }
 270
 271 CODEC_ACTION_STORE(reconfig);
 272 CODEC_ACTION_STORE(clear);
 273
 274 static ssize_t init_verbs_store(struct device *dev,
 275                                 struct device_attribute *attr,
 276                                 const char *buf, size_t count)
 277 {
 278         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 279         struct hda_codec *codec = hwdep->private_data;
 280         struct hda_verb *v;
 281         int nid, verb, param;
 282
 283         if (sscanf(buf, "%i %i %i", &nid, &verb, &param) != 3)
 284                 return -EINVAL;
 285         if (!nid || !verb)
 286                 return -EINVAL;
 287         v = snd_array_new(&codec->init_verbs);
 288         if (!v)
 289                 return -ENOMEM;
 290         v->nid = nid;
 291         v->verb = verb;
 292         v->param = param;
 293         return count;
 294 }
 295
 296 static ssize_t hints_store(struct device *dev,
 297                            struct device_attribute *attr,
 298                            const char *buf, size_t count)
 299 {
 300         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 301         struct hda_codec *codec = hwdep->private_data;
 302         char *p;
 303         char **hint;
 304
 305         if (!*buf || isspace(*buf) || *buf == '#' || *buf == '\n')
 306                 return count;
 307         p = kstrndup_noeol(buf, 1024);
 308         if (!p)
 309                 return -ENOMEM;
 310         hint = snd_array_new(&codec->hints);
 311         if (!hint) {
 312                 kfree(p);
 313                 return -ENOMEM;
 314         }
 315         *hint = p;
 316         return count;
 317 }
 318
 319 #define CODEC_ATTR_RW(type) \
 320         __ATTR(type, 0644, type##_show, type##_store)
 321 #define CODEC_ATTR_RO(type) \
 322         __ATTR_RO(type)
 323 #define CODEC_ATTR_WO(type) \
 324         __ATTR(type, 0200, NULL, type##_store)
 325
 326 static struct device_attribute codec_attrs[] = {
 327         CODEC_ATTR_RW(vendor_id),
 328         CODEC_ATTR_RW(subsystem_id),
 329         CODEC_ATTR_RW(revision_id),
 330         CODEC_ATTR_RO(afg),
 331         CODEC_ATTR_RO(mfg),
 332         CODEC_ATTR_RW(name),
 333         CODEC_ATTR_RW(modelname),
 334         CODEC_ATTR_WO(init_verbs),
 335         CODEC_ATTR_WO(hints),
 336         CODEC_ATTR_WO(reconfig),
 337         CODEC_ATTR_WO(clear),
 338 };
 339
 340 /*
 341  * create sysfs files on hwdep directory
 342  */
 343 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 344 {
 345         struct snd_hwdep *hwdep = codec->hwdep;
 346         int i;
 347
 348         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 349                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 350                                           hwdep->device, &codec_attrs[i]);
 351         return 0;
 352 }
 353
 354 #endif /* CONFIG_SND_HDA_RECONFIG */