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