LXR linux/sound/pci/hda/hda

   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 */
  33static 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
  47static 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 */
  63static 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
  81static 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
  88static 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
  97int 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}
 125