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 } 183