1 /* 2 * 32bit -> 64bit ioctl wrapper for raw MIDI 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 rawmidi.c */ 22 23 #include <linux/compat.h> 24 25 struct snd_rawmidi_params32 { 26 s32 stream; 27 u32 buffer_size; 28 u32 avail_min; 29 unsigned int no_active_sensing; /* avoid bit-field */ 30 unsigned char reserved[16]; 31 } __attribute__((packed)); 32 33 static int snd_rawmidi_ioctl_params_compat(struct snd_rawmidi_file *rfile, 34 struct snd_rawmidi_params32 __user *src) 35 { 36 struct snd_rawmidi_params params; 37 unsigned int val; 38 39 if (rfile->output == NULL) 40 return -EINVAL; 41 if (get_user(params.stream, &src->stream) || 42 get_user(params.buffer_size, &src->buffer_size) || 43 get_user(params.avail_min, &src->avail_min) || 44 get_user(val, &src->no_active_sensing)) 45 return -EFAULT; 46 params.no_active_sensing = val; 47 switch (params.stream) { 48 case SNDRV_RAWMIDI_STREAM_OUTPUT: 49 return snd_rawmidi_output_params(rfile->output, ¶ms); 50 case SNDRV_RAWMIDI_STREAM_INPUT: 51 return snd_rawmidi_input_params(rfile->input, ¶ms); 52 } 53 return -EINVAL; 54 } 55 56 struct snd_rawmidi_status32 { 57 s32 stream; 58 struct compat_timespec tstamp; 59 u32 avail; 60 u32 xruns; 61 unsigned char reserved[16]; 62 } __attribute__((packed)); 63 64 static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile, 65 struct snd_rawmidi_status32 __user *src) 66 { 67 int err; 68 struct snd_rawmidi_status status; 69 70 if (rfile->output == NULL) 71 return -EINVAL; 72 if (get_user(status.stream, &src->stream)) 73 return -EFAULT; 74 75 switch (status.stream) { 76 case SNDRV_RAWMIDI_STREAM_OUTPUT: 77 err = snd_rawmidi_output_status(rfile->output, &status); 78 break; 79 case SNDRV_RAWMIDI_STREAM_INPUT: 80 err = snd_rawmidi_input_status(rfile->input, &status); 81 break; 82 default: 83 return -EINVAL; 84 } 85 if (err < 0) 86 return err; 87 88 if (compat_put_timespec(&status.tstamp, &src->tstamp) || 89 put_user(status.avail, &src->avail) || 90 put_user(status.xruns, &src->xruns)) 91 return -EFAULT; 92 93 return 0; 94 } 95 96 enum { 97 SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32), 98 SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32), 99 }; 100 101 static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 102 { 103 struct snd_rawmidi_file *rfile; 104 void __user *argp = compat_ptr(arg); 105 106 rfile = file->private_data; 107 switch (cmd) { 108 case SNDRV_RAWMIDI_IOCTL_PVERSION: 109 case SNDRV_RAWMIDI_IOCTL_INFO: 110 case SNDRV_RAWMIDI_IOCTL_DROP: 111 case SNDRV_RAWMIDI_IOCTL_DRAIN: 112 return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp); 113 case SNDRV_RAWMIDI_IOCTL_PARAMS32: 114 return snd_rawmidi_ioctl_params_compat(rfile, argp); 115 case SNDRV_RAWMIDI_IOCTL_STATUS32: 116 return snd_rawmidi_ioctl_status_compat(rfile, argp); 117 } 118 return -ENOIOCTLCMD; 119 } 120