diff options
Diffstat (limited to 'sound/core/rawmidi_compat.c')
| -rw-r--r-- | sound/core/rawmidi_compat.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sound/core/rawmidi_compat.c b/sound/core/rawmidi_compat.c new file mode 100644 index 000000000000..d97631c3f3ad --- /dev/null +++ b/sound/core/rawmidi_compat.c @@ -0,0 +1,120 @@ +/* + * 32bit -> 64bit ioctl wrapper for raw MIDI API + * Copyright (c) by Takashi Iwai <tiwai@suse.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +/* This file included from rawmidi.c */ + +#include <linux/compat.h> + +struct sndrv_rawmidi_params32 { + s32 stream; + u32 buffer_size; + u32 avail_min; + unsigned int no_active_sensing; /* avoid bit-field */ + unsigned char reserved[16]; +} __attribute__((packed)); + +static int snd_rawmidi_ioctl_params_compat(snd_rawmidi_file_t *rfile, + struct sndrv_rawmidi_params32 __user *src) +{ + snd_rawmidi_params_t params; + unsigned int val; + + if (rfile->output == NULL) + return -EINVAL; + if (get_user(params.stream, &src->stream) || + get_user(params.buffer_size, &src->buffer_size) || + get_user(params.avail_min, &src->avail_min) || + get_user(val, &src->no_active_sensing)) + return -EFAULT; + params.no_active_sensing = val; + switch (params.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + return snd_rawmidi_output_params(rfile->output, ¶ms); + case SNDRV_RAWMIDI_STREAM_INPUT: + return snd_rawmidi_input_params(rfile->input, ¶ms); + } + return -EINVAL; +} + +struct sndrv_rawmidi_status32 { + s32 stream; + struct compat_timespec tstamp; + u32 avail; + u32 xruns; + unsigned char reserved[16]; +} __attribute__((packed)); + +static int snd_rawmidi_ioctl_status_compat(snd_rawmidi_file_t *rfile, + struct sndrv_rawmidi_status32 __user *src) +{ + int err; + snd_rawmidi_status_t status; + + if (rfile->output == NULL) + return -EINVAL; + if (get_user(status.stream, &src->stream)) + return -EFAULT; + + switch (status.stream) { + case SNDRV_RAWMIDI_STREAM_OUTPUT: + err = snd_rawmidi_output_status(rfile->output, &status); + break; + case SNDRV_RAWMIDI_STREAM_INPUT: + err = snd_rawmidi_input_status(rfile->input, &status); + break; + default: + return -EINVAL; + } + if (err < 0) + return err; + + if (put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) || + put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) || + put_user(status.avail, &src->avail) || + put_user(status.xruns, &src->xruns)) + return -EFAULT; + + return 0; +} + +enum { + SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct sndrv_rawmidi_params32), + SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct sndrv_rawmidi_status32), +}; + +static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) +{ + snd_rawmidi_file_t *rfile; + void __user *argp = compat_ptr(arg); + + rfile = file->private_data; + switch (cmd) { + case SNDRV_RAWMIDI_IOCTL_PVERSION: + case SNDRV_RAWMIDI_IOCTL_INFO: + case SNDRV_RAWMIDI_IOCTL_DROP: + case SNDRV_RAWMIDI_IOCTL_DRAIN: + return snd_rawmidi_ioctl(file, cmd, (unsigned long)argp); + case SNDRV_RAWMIDI_IOCTL_PARAMS32: + return snd_rawmidi_ioctl_params_compat(rfile, argp); + case SNDRV_RAWMIDI_IOCTL_STATUS32: + return snd_rawmidi_ioctl_status_compat(rfile, argp); + } + return -ENOIOCTLCMD; +} |