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 sndrv_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 sndrv_timer_info32 __user *_info)
  37 {
  38         snd_timer_user_t *tu;
  39         struct sndrv_timer_info32 info;
  40         snd_timer_t *t;
  41
  42         tu = file->private_data;
  43         snd_assert(tu->timeri != NULL, return -ENXIO);
  44         t = tu->timeri->timer;
  45         snd_assert(t != NULL, return -ENXIO);
  46         memset(&info, 0, sizeof(info));
  47         info.card = t->card ? t->card->number : -1;
  48         if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
  49                 info.flags |= SNDRV_TIMER_FLG_SLAVE;
  50         strlcpy(info.id, t->id, sizeof(info.id));
  51         strlcpy(info.name, t->name, sizeof(info.name));
  52         info.resolution = t->hw.resolution;
  53         if (copy_to_user(_info, &info, sizeof(*_info)))
  54                 return -EFAULT;
  55         return 0;
  56 }
  57
  58 struct sndrv_timer_status32 {
  59         struct compat_timespec tstamp;
  60         u32 resolution;
  61         u32 lost;
  62         u32 overrun;
  63         u32 queue;
  64         unsigned char reserved[64];
  65 };
  66
  67 static int snd_timer_user_status_compat(struct file *file,
  68                                         struct sndrv_timer_status32 __user *_status)
  69 {
  70         snd_timer_user_t *tu;
  71         snd_timer_status_t status;
  72
  73         tu = file->private_data;
  74         snd_assert(tu->timeri != NULL, return -ENXIO);
  75         memset(&status, 0, sizeof(status));
  76         status.tstamp = tu->tstamp;
  77         status.resolution = snd_timer_resolution(tu->timeri);
  78         status.lost = tu->timeri->lost;
  79         status.overrun = tu->overrun;
  80         spin_lock_irq(&tu->qlock);
  81         status.queue = tu->qused;
  82         spin_unlock_irq(&tu->qlock);
  83         if (copy_to_user(_status, &status, sizeof(status)))
  84                 return -EFAULT;
  85         return 0;
  86 }
  87
  88 /*
  89  */
  90
  91 enum {
  92         SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct sndrv_timer_info32),
  93         SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct sndrv_timer_status32),
  94 };
  95
  96 static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
  97 {
  98         void __user *argp = compat_ptr(arg);
  99
 100         switch (cmd) {
 101         case SNDRV_TIMER_IOCTL_PVERSION:
 102         case SNDRV_TIMER_IOCTL_TREAD:
 103         case SNDRV_TIMER_IOCTL_GINFO:
 104         case SNDRV_TIMER_IOCTL_GPARAMS:
 105         case SNDRV_TIMER_IOCTL_GSTATUS:
 106         case SNDRV_TIMER_IOCTL_SELECT:
 107         case SNDRV_TIMER_IOCTL_PARAMS:
 108         case SNDRV_TIMER_IOCTL_START:
 109         case SNDRV_TIMER_IOCTL_STOP:
 110         case SNDRV_TIMER_IOCTL_CONTINUE:
 111         case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
 112                 return snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
 113         case SNDRV_TIMER_IOCTL_INFO32:
 114                 return snd_timer_user_info_compat(file, argp);
 115         case SNDRV_TIMER_IOCTL_STATUS32:
 116                 return snd_timer_user_status_compat(file, argp);
 117         }
 118         return -ENOIOCTLCMD;
 119 }