sound/core/timer_compat.c

   1 /*
   2  *   32bit -> 64bit ioctl wrapper for timer API
   3  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program; if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  *
  19  */
  20
  21 /* This file included from timer.c */
  22
  23 #include <linux/compat.h>
  24
  25 /*
  26  * ILP32/LP64 has different size for 'long' type. Additionally, the size
  27  * of storage alignment differs depending on architectures. Here, '__packed'
  28  * qualifier is used so that the size of this structure is multiple of 4 and
  29  * it fits to any architectures with 32 bit storage alignment.
  30  */
  31 struct snd_timer_gparams32 {
  32         struct snd_timer_id tid;
  33         u32 period_num;
  34         u32 period_den;
  35         unsigned char reserved[32];
  36 } __packed;
  37
  38 struct snd_timer_info32 {
  39         u32 flags;
  40         s32 card;
  41         unsigned char id[64];
  42         unsigned char name[80];
  43         u32 reserved0;
  44         u32 resolution;
  45         unsigned char reserved[64];
  46 };
  47
  48 static int snd_timer_user_gparams_compat(struct file *file,
  49                                         struct snd_timer_gparams32 __user *user)
  50 {
  51         struct snd_timer_gparams gparams;
  52
  53         if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
  54             get_user(gparams.period_num, &user->period_num) ||
  55             get_user(gparams.period_den, &user->period_den))
  56                 return -EFAULT;
  57
  58         return timer_set_gparams(&gparams);
  59 }
  60
  61 static int snd_timer_user_info_compat(struct file *file,
  62                                       struct snd_timer_info32 __user *_info)
  63 {
  64         struct snd_timer_user *tu;
  65         struct snd_timer_info32 info;
  66         struct snd_timer *t;
  67
  68         tu = file->private_data;
  69         if (!tu->timeri)
  70                 return -EBADFD;
  71         t = tu->timeri->timer;
  72         if (!t)
  73                 return -EBADFD;
  74         memset(&info, 0, sizeof(info));
  75         info.card = t->card ? t->card->number : -1;
  76         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
  77                 info.flags |= SNDRV_TIMER_FLG_SLAVE;
  78         strlcpy(info.id, t->id, sizeof(info.id));
  79         strlcpy(info.name, t->name, sizeof(info.name));
  80         info.resolution = t->hw.resolution;
  81         if (copy_to_user(_info, &info, sizeof(*_info)))
  82                 return -EFAULT;
  83         return 0;
  84 }
  85
  86 struct snd_timer_status32 {
  87         struct compat_timespec tstamp;
  88         u32 resolution;
  89         u32 lost;
  90         u32 overrun;
  91         u32 queue;
  92         unsigned char reserved[64];
  93 };
  94
  95 static int snd_timer_user_status_compat(struct file *file,
  96                                         struct snd_timer_status32 __user *_status)
  97 {
  98         struct snd_timer_user *tu;
  99         struct snd_timer_status32 status;
 100
 101         tu = file->private_data;
 102         if (!tu->timeri)
 103                 return -EBADFD;
 104         memset(&status, 0, sizeof(status));
 105         status.tstamp.tv_sec = tu->tstamp.tv_sec;
 106         status.tstamp.tv_nsec = tu->tstamp.tv_nsec;
 107         status.resolution = snd_timer_resolution(tu->timeri);
 108         status.lost = tu->timeri->lost;
 109         status.overrun = tu->overrun;
 110         spin_lock_irq(&tu->qlock);
 111         status.queue = tu->qused;
 112         spin_unlock_irq(&tu->qlock);
 113         if (copy_to_user(_status, &status, sizeof(status)))
 114                 return -EFAULT;
 115         return 0;
 116 }
 117
 118 #ifdef CONFIG_X86_X32
 119 /* X32 ABI has the same struct as x86-64 */
 120 #define snd_timer_user_status_x32(file, s) \
 121         snd_timer_user_status(file, s)
 122 #endif /* CONFIG_X86_X32 */
 123
 124 /*
 125  */
 126
 127 enum {
 128         SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
 129         SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
 130         SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
 131 #ifdef CONFIG_X86_X32
 132         SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status),
 133 #endif /* CONFIG_X86_X32 */
 134 };
 135
 136 static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 137                                           unsigned long arg)
 138 {
 139         void __user *argp = compat_ptr(arg);
 140
 141         switch (cmd) {
 142         case SNDRV_TIMER_IOCTL_PVERSION:
 143         case SNDRV_TIMER_IOCTL_TREAD:
 144         case SNDRV_TIMER_IOCTL_GINFO:
 145         case SNDRV_TIMER_IOCTL_GSTATUS:
 146         case SNDRV_TIMER_IOCTL_SELECT:
 147         case SNDRV_TIMER_IOCTL_PARAMS:
 148         case SNDRV_TIMER_IOCTL_START:
 149         case SNDRV_TIMER_IOCTL_START_OLD:
 150         case SNDRV_TIMER_IOCTL_STOP:
 151         case SNDRV_TIMER_IOCTL_STOP_OLD:
 152         case SNDRV_TIMER_IOCTL_CONTINUE:
 153         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
 154         case SNDRV_TIMER_IOCTL_PAUSE:
 155         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
 156         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
 157                 return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
 158         case SNDRV_TIMER_IOCTL_GPARAMS32:
 159                 return snd_timer_user_gparams_compat(file, argp);
 160         case SNDRV_TIMER_IOCTL_INFO32:
 161                 return snd_timer_user_info_compat(file, argp);
 162         case SNDRV_TIMER_IOCTL_STATUS32:
 163                 return snd_timer_user_status_compat(file, argp);
 164 #ifdef CONFIG_X86_X32
 165         case SNDRV_TIMER_IOCTL_STATUS_X32:
 166                 return snd_timer_user_status_x32(file, argp);
 167 #endif /* CONFIG_X86_X32 */
 168         }
 169         return -ENOIOCTLCMD;
 170 }
 171
 172 static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 173                                         unsigned long arg)
 174 {
 175         struct snd_timer_user *tu = file->private_data;
 176         long ret;
 177
 178         mutex_lock(&tu->ioctl_lock);
 179         ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
 180         mutex_unlock(&tu->ioctl_lock);
 181         return ret;
 182 }