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 <sound/driver.h>
  22 #include <linux/init.h>
  23 #include <linux/slab.h>
  24 #include <linux/pci.h>
  25 #include <linux/compat.h>
  26 #include <linux/mutex.h>
  27 #include <sound/core.h>
  28 #include "hda_codec.h"
  29 #include "hda_local.h"
  30 #include <sound/hda_hwdep.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_DETECT
  93         if (!capable(CAP_SYS_RAWIO))
  94                 return -EACCES;
  95 #endif
  96         return 0;
  97 }
  98
  99 int __devinit snd_hda_create_hwdep(struct hda_codec *codec)
 100 {
 101         char hwname[16];
 102         struct snd_hwdep *hwdep;
 103         int err;
 104
 105         sprintf(hwname, "HDA Codec %d", codec->addr);
 106         err = snd_hwdep_new(codec->bus->card, hwname, codec->addr, &hwdep);
 107         if (err < 0)
 108                 return err;
 109         codec->hwdep = hwdep;
 110         sprintf(hwdep->name, "HDA Codec %d", codec->addr);
 111         hwdep->iface = SNDRV_HWDEP_IFACE_HDA;
 112         hwdep->private_data = codec;
 113         hwdep->exclusive = 1;
 114
 115         hwdep->ops.open = hda_hwdep_open;
 116         hwdep->ops.ioctl = hda_hwdep_ioctl;
 117 #ifdef CONFIG_COMPAT
 118         hwdep->ops.ioctl_compat = hda_hwdep_ioctl_compat;
 119 #endif
 120
 121         return 0;
 122 }