git.oblomov.eu Git - linux-2.6/blob - 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 <sound/core.h>
  27 #include "hda_codec.h"
  28 #include "hda_local.h"
  29 #include <sound/hda_hwdep.h>
  30 #include <sound/minors.h>
  31
  32 /*
  33  * write/read an out-of-bound verb
  34  */
  35 static int verb_write_ioctl(struct hda_codec *codec,
  36                             struct hda_verb_ioctl __user *arg)
  37 {
  38         u32 verb, res;
  39
  40         if (get_user(verb, &arg->verb))
  41                 return -EFAULT;
  42         res = snd_hda_codec_read(codec, verb >> 24, 0,
  43                                  (verb >> 8) & 0xffff, verb & 0xff);
  44         if (put_user(res, &arg->res))
  45                 return -EFAULT;
  46         return 0;
  47 }
  48
  49 static int get_wcap_ioctl(struct hda_codec *codec,
  50                           struct hda_verb_ioctl __user *arg)
  51 {
  52         u32 verb, res;
  53
  54         if (get_user(verb, &arg->verb))
  55                 return -EFAULT;
  56         res = get_wcaps(codec, verb >> 24);
  57         if (put_user(res, &arg->res))
  58                 return -EFAULT;
  59         return 0;
  60 }
  61
  62
  63 /*
  64  */
  65 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  66                            unsigned int cmd, unsigned long arg)
  67 {
  68         struct hda_codec *codec = hw->private_data;
  69         void __user *argp = (void __user *)arg;
  70
  71         switch (cmd) {
  72         case HDA_IOCTL_PVERSION:
  73                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  74         case HDA_IOCTL_VERB_WRITE:
  75                 return verb_write_ioctl(codec, argp);
  76         case HDA_IOCTL_GET_WCAP:
  77                 return get_wcap_ioctl(codec, argp);
  78         }
  79         return -ENOIOCTLCMD;
  80 }
  81
  82 #ifdef CONFIG_COMPAT
  83 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  84                                   unsigned int cmd, unsigned long arg)
  85 {
  86         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  87 }
  88 #endif
  89
  90 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  91 {
  92 #ifndef CONFIG_SND_DEBUG_VERBOSE
  93         if (!capable(CAP_SYS_RAWIO))
  94                 return -EACCES;
  95 #endif
  96         return 0;
  97 }
  98
  99 static void clear_hwdep_elements(struct hda_codec *codec)
 100 {
 101         /* clear init verbs */
 102         snd_array_free(&codec->init_verbs);
 103 }
 104
 105 static void hwdep_free(struct snd_hwdep *hwdep)
 106 {
 107         clear_hwdep_elements(hwdep->private_data);
 108 }
 109
 110 int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
 111 {
 112         char hwname[16];
 113         struct snd_hwdep *hwdep;
 114         int err;
 115
 116         sprintf(hwname, "HDA Codec %d", codec->addr);
 117         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 118         if (err < 0)
 119                 return err;
 120         codec->hwdep = hwdep;
 121         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 122         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 123         hwdep->private_data = codec;
 124         hwdep->private_free = hwdep_free;
 125         hwdep->exclusive = 1;
 126
 127         hwdep->ops.open = hda_hwdep_open;
 128         hwdep->ops.ioctl = hda_hwdep_ioctl;
 129 #ifdef CONFIG_COMPAT
 130         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 131 #endif
 132
 133         snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * sysfs interface
 140  */
 141
 142 static int clear_codec(struct hda_codec *codec)
 143 {
 144         snd_hda_codec_reset(codec);
 145         clear_hwdep_elements(codec);
 146         return 0;
 147 }
 148
 149 static int reconfig_codec(struct hda_codec *codec)
 150 {
 151         int err;
 152
 153         snd_printk(KERN_INFO "hda-codec: reconfiguring\n");
 154         snd_hda_codec_reset(codec);
 155         err = snd_hda_codec_configure(codec);
 156         if (err < 0)
 157                 return err;
 158         /* rebuild PCMs */
 159         err = snd_hda_build_pcms(codec->bus);
 160         if (err < 0)
 161                 return err;
 162         /* rebuild mixers */
 163         err = snd_hda_codec_build_controls(codec);
 164         if (err < 0)
 165                 return err;
 166         return 0;
 167 }
 168
 169 /*
 170  * allocate a string at most len chars, and remove the trailing EOL
 171  */
 172 static char *kstrndup_noeol(const char *src, size_t len)
 173 {
 174         char *s = kstrndup(src, len, GFP_KERNEL);
 175         char *p;
 176         if (!s)
 177                 return NULL;
 178         p = strchr(s, '\n');
 179         if (p)
 180                 *p = 0;
 181         return s;
 182 }
 183
 184 #define CODEC_INFO_SHOW(type)                                   \
 185 static ssize_t type##_show(struct device *dev,                  \
 186                            struct device_attribute *attr,       \
 187                            char *buf)                           \
 188 {                                                               \
 189         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 190         struct hda_codec *codec = hwdep->private_data;          \
 191         return sprintf(buf, "0x%x\n", codec->type);             \
 192 }
 193
 194 #define CODEC_INFO_STR_SHOW(type)                               \
 195 static ssize_t type##_show(struct device *dev,                  \
 196                              struct device_attribute *attr,     \
 197                                         char *buf)              \
 198 {                                                               \
 199         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 200         struct hda_codec *codec = hwdep->private_data;          \
 201         return sprintf(buf, "%s\n",                             \
 202                        codec->type ? codec->type : "");         \
 203 }
 204
 205 CODEC_INFO_SHOW(vendor_id);
 206 CODEC_INFO_SHOW(subsystem_id);
 207 CODEC_INFO_SHOW(revision_id);
 208 CODEC_INFO_SHOW(afg);
 209 CODEC_INFO_SHOW(mfg);
 210 CODEC_INFO_STR_SHOW(name);
 211 CODEC_INFO_STR_SHOW(modelname);
 212
 213 #define CODEC_INFO_STORE(type)                                  \
 214 static ssize_t type##_store(struct device *dev,                 \
 215                             struct device_attribute *attr,      \
 216                             const char *buf, size_t count)      \
 217 {                                                               \
 218         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 219         struct hda_codec *codec = hwdep->private_data;          \
 220         char *after;                                            \
 221         codec->type = simple_strtoul(buf, &after, 0);           \
 222         return count;                                           \
 223 }
 224
 225 #define CODEC_INFO_STR_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 *s = kstrndup_noeol(buf, 64);                      \
 233         if (!s)                                                 \
 234                 return -ENOMEM;                                 \
 235         kfree(codec->type);                                     \
 236         codec->type = s;                                        \
 237         return count;                                           \
 238 }
 239
 240 CODEC_INFO_STORE(vendor_id);
 241 CODEC_INFO_STORE(subsystem_id);
 242 CODEC_INFO_STORE(revision_id);
 243 CODEC_INFO_STR_STORE(name);
 244 CODEC_INFO_STR_STORE(modelname);
 245
 246 #define CODEC_ACTION_STORE(type)                                \
 247 static ssize_t type##_store(struct device *dev,                 \
 248                             struct device_attribute *attr,      \
 249                             const char *buf, size_t count)      \
 250 {                                                               \
 251         struct snd_hwdep *hwdep = dev_get_drvdata(dev);         \
 252         struct hda_codec *codec = hwdep->private_data;          \
 253         int err = 0;                                            \
 254         if (*buf)                                               \
 255                 err = type##_codec(codec);                      \
 256         return err < 0 ? err : count;                           \
 257 }
 258
 259 CODEC_ACTION_STORE(reconfig);
 260 CODEC_ACTION_STORE(clear);
 261
 262 static ssize_t init_verbs_store(struct device *dev,
 263                                 struct device_attribute *attr,
 264                                 const char *buf, size_t count)
 265 {
 266         struct snd_hwdep *hwdep = dev_get_drvdata(dev);
 267         struct hda_codec *codec = hwdep->private_data;
 268         char *p;
 269         struct hda_verb verb, *v;
 270
 271         verb.nid = simple_strtoul(buf, &p, 0);
 272         verb.verb = simple_strtoul(p, &p, 0);
 273         verb.param = simple_strtoul(p, &p, 0);
 274         if (!verb.nid || !verb.verb || !verb.param)
 275                 return -EINVAL;
 276         v = snd_array_new(&codec->init_verbs);
 277         if (!v)
 278                 return -ENOMEM;
 279         *v = verb;
 280         return count;
 281 }
 282
 283 #define CODEC_ATTR_RW(type) \
 284         __ATTR(type, 0644, type##_show, type##_store)
 285 #define CODEC_ATTR_RO(type) \
 286         __ATTR_RO(type)
 287 #define CODEC_ATTR_WO(type) \
 288         __ATTR(type, 0200, NULL, type##_store)
 289
 290 static struct device_attribute codec_attrs[] = {
 291         CODEC_ATTR_RW(vendor_id),
 292         CODEC_ATTR_RW(subsystem_id),
 293         CODEC_ATTR_RW(revision_id),
 294         CODEC_ATTR_RO(afg),
 295         CODEC_ATTR_RO(mfg),
 296         CODEC_ATTR_RW(name),
 297         CODEC_ATTR_RW(modelname),
 298         CODEC_ATTR_WO(init_verbs),
 299         CODEC_ATTR_WO(reconfig),
 300         CODEC_ATTR_WO(clear),
 301 };
 302
 303 /*
 304  * create sysfs files on hwdep directory
 305  */
 306 int snd_hda_hwdep_add_sysfs(struct hda_codec *codec)
 307 {
 308         struct snd_hwdep *hwdep = codec->hwdep;
 309         int i;
 310
 311         for (i = 0; i < ARRAY_SIZE(codec_attrs); i++)
 312                 snd_add_device_sysfs_file(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card,
 313                                           hwdep->device, &codec_attrs[i]);
 314         return 0;
 315 }