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/compat.h>
  24 #include <sound/core.h>
  25 #include "hda_codec.h"
  26 #include "hda_local.h"
  27 #include <sound/hda_hwdep.h>
  28 #include <sound/minors.h>
  29
  30 /*
  31  * write/read an out-of-bound verb
  32  */
  33 static int verb_write_ioctl(struct hda_codec *codec,
  34                             struct hda_verb_ioctl __user *arg)
  35 {
  36         u32 verb, res;
  37
  38         if (get_user(verb, &arg->verb))
  39                 return -EFAULT;
  40         res = snd_hda_codec_read(codec, verb >> 24, 0,
  41                                  (verb >> 8) & 0xffff, verb & 0xff);
  42         if (put_user(res, &arg->res))
  43                 return -EFAULT;
  44         return 0;
  45 }
  46
  47 static int get_wcap_ioctl(struct hda_codec *codec,
  48                           struct hda_verb_ioctl __user *arg)
  49 {
  50         u32 verb, res;
  51
  52         if (get_user(verb, &arg->verb))
  53                 return -EFAULT;
  54         res = get_wcaps(codec, verb >> 24);
  55         if (put_user(res, &arg->res))
  56                 return -EFAULT;
  57         return 0;
  58 }
  59
  60
  61 /*
  62  */
  63 static int hda_hwdep_ioctl(struct snd_hwdep *hw, struct file *file,
  64                            unsigned int cmd, unsigned long arg)
  65 {
  66         struct hda_codec *codec = hw->private_data;
  67         void __user *argp = (void __user *)arg;
  68
  69         switch (cmd) {
  70         case HDA_IOCTL_PVERSION:
  71                 return put_user(HDA_HWDEP_VERSION, (int __user *)argp);
  72         case HDA_IOCTL_VERB_WRITE:
  73                 return verb_write_ioctl(codec, argp);
  74         case HDA_IOCTL_GET_WCAP:
  75                 return get_wcap_ioctl(codec, argp);
  76         }
  77         return -ENOIOCTLCMD;
  78 }
  79
  80 #ifdef CONFIG_COMPAT
  81 static int hda_hwdep_ioctl_compat(struct snd_hwdep *hw, struct file *file,
  82                                   unsigned int cmd, unsigned long arg)
  83 {
  84         return hda_hwdep_ioctl(hw, file, cmd, (unsigned long)compat_ptr(arg));
  85 }
  86 #endif
  87
  88 static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
  89 {
  90 #ifndef CONFIG_SND_DEBUG_VERBOSE
  91         if (!capable(CAP_SYS_RAWIO))
  92                 return -EACCES;
  93 #endif
  94         return 0;
  95 }
  96
  97 int snd_hda_create_hwdep(struct hda_codec *codec)
  98 {
  99         char hwname[16];
 100         struct snd_hwdep *hwdep;
 101         int err;
 102
 103         sprintf(hwname, "HDA Codec %d", codec->addr);
 104         err = snd_hwdep_new(codec->card, hwname, codec->addr, &hwdep);
 105         if (err < 0)
 106                 return err;
 107         codec->hwdep = hwdep;
 108         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 109         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 110         hwdep->private_data = codec;
 111         hwdep->exclusive = 1;
 112
 113         hwdep->ops.open = hda_hwdep_open;
 114         hwdep->ops.ioctl = hda_hwdep_ioctl;
 115 #ifdef CONFIG_COMPAT
 116         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 117 #endif
 118
 119         /* for sysfs */
 120         hwdep->dev.groups = snd_hda_dev_attr_groups;
 121         dev_set_drvdata(&hwdep->dev, codec);
 122
 123         return 0;
 124 }