kernel/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 struct snd_timer_info32 {
  26         u32 flags;
  27         s32 card;
  28         unsigned char id[64];
  29         unsigned char name[80];
  30         u32 reserved0;
  31         u32 resolution;
  32         unsigned char reserved[64];
  33 };
  34
  35 static int snd_timer_user_info_compat(struct file *file,
  36                                       struct snd_timer_info32 __user *_info)
  37 {
  38         struct snd_timer_user *tu;
  39         struct snd_timer_info32 info;
  40         struct snd_timer *t;
  41
  42         tu = file->private_data;
  43         if (snd_BUG_ON(!tu->timeri))
  44                 return -ENXIO;
  45         t = tu->timeri->timer;
  46         if (snd_BUG_ON(!t))
  47                 return -ENXIO;
  48         memset(&info, 0, sizeof(info));
  49         info.card = t->card ? t->card->number : -1;
  50         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
  51                 info.flags |= SNDRV_TIMER_FLG_SLAVE;
  52         strlcpy(info.id, t->id, sizeof(info.id));
  53         strlcpy(info.name, t->name, sizeof(info.name));
  54         info.resolution = t->hw.resolution;
  55         if (copy_to_user(_info, &info, sizeof(*_info)))
  56                 return -EFAULT;
  57         return 0;
  58 }
  59
  60 struct snd_timer_status32 {
  61         struct compat_timespec tstamp;
  62         u32 resolution;
  63         u32 lost;
  64         u32 overrun;
  65         u32 queue;
  66         unsigned char reserved[64];
  67 };
  68
  69 static int snd_timer_user_status_compat(struct file *file,
  70                                         struct snd_timer_status32 __user *_status)
  71 {
  72         struct snd_timer_user *tu;
  73         struct snd_timer_status32 status;
  74
  75         tu = file->private_data;
  76         if (snd_BUG_ON(!tu->timeri))
  77                 return -ENXIO;
  78         memset(&status, 0, sizeof(status));
  79         status.tstamp.tv_sec = tu->tstamp.tv_sec;
  80         status.tstamp.tv_nsec = tu->tstamp.tv_nsec;
  81         status.resolution = snd_timer_resolution(tu->timeri);
  82         status.lost = tu->timeri->lost;
  83         status.overrun = tu->overrun;
  84         spin_lock_irq(&tu->qlock);
  85         status.queue = tu->qused;
  86         spin_unlock_irq(&tu->qlock);
  87         if (copy_to_user(_status, &status, sizeof(status)))
  88                 return -EFAULT;
  89         return 0;
  90 }
  91
  92 #ifdef CONFIG_X86_X32
  93 /* X32 ABI has the same struct as x86-64 */
  94 #define snd_timer_user_status_x32(file, s) \
  95         snd_timer_user_status(file, s)
  96 #endif /* CONFIG_X86_X32 */
  97
  98 /*
  99  */
 100
 101 enum {
 102         SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
 103         SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
 104 #ifdef CONFIG_X86_X32
 105         SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status),
 106 #endif /* CONFIG_X86_X32 */
 107 };
 108
 109 static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 110 {
 111         void __user *argp = compat_ptr(arg);
 112
 113         switch (cmd) {
 114         case SNDRV_TIMER_IOCTL_PVERSION:
 115         case SNDRV_TIMER_IOCTL_TREAD:
 116         case SNDRV_TIMER_IOCTL_GINFO:
 117         case SNDRV_TIMER_IOCTL_GPARAMS:
 118         case SNDRV_TIMER_IOCTL_GSTATUS:
 119         case SNDRV_TIMER_IOCTL_SELECT:
 120         case SNDRV_TIMER_IOCTL_PARAMS:
 121         case SNDRV_TIMER_IOCTL_START:
 122         case SNDRV_TIMER_IOCTL_START_OLD:
 123         case SNDRV_TIMER_IOCTL_STOP:
 124         case SNDRV_TIMER_IOCTL_STOP_OLD:
 125         case SNDRV_TIMER_IOCTL_CONTINUE:
 126         case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
 127         case SNDRV_TIMER_IOCTL_PAUSE:
 128         case SNDRV_TIMER_IOCTL_PAUSE_OLD:
 129         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
 130                 return snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
 131         case SNDRV_TIMER_IOCTL_INFO32:
 132                 return snd_timer_user_info_compat(file, argp);
 133         case SNDRV_TIMER_IOCTL_STATUS32:
 134                 return snd_timer_user_status_compat(file, argp);
 135 #ifdef CONFIG_X86_X32
 136         case SNDRV_TIMER_IOCTL_STATUS_X32:
 137                 return snd_timer_user_status_x32(file, argp);
 138 #endif /* CONFIG_X86_X32 */
 139         }
 140         return -ENOIOCTLCMD;
 141 }