sound/core/pcm_compat.c - arm/linux-arm64-legacy - Git at Google

 /*
  *   32bit -> 64bit ioctl wrapper for PCM 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 pcm_native.c */

 #include <linux/compat.h>

 static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
 				      s32 __user *src)
 {
 	snd_pcm_sframes_t delay;
 	mm_segment_t fs;
 	int err;

 	fs = snd_enter_user();
 	err = snd_pcm_delay(substream, &delay);
 	snd_leave_user(fs);
 	if (err < 0)
 		return err;
 	if (put_user(delay, src))
 		return -EFAULT;
 	return err;
 }

 static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
 				       u32 __user *src)
 {
 	snd_pcm_uframes_t frames;
 	int err;

 	if (get_user(frames, src))
 		return -EFAULT;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		err = snd_pcm_playback_rewind(substream, frames);
 	else
 		err = snd_pcm_capture_rewind(substream, frames);
 	if (put_user(err, src))
 		return -EFAULT;
 	return err < 0 ? err : 0;
 }

 static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
 				       u32 __user *src)
 {
 	snd_pcm_uframes_t frames;
 	int err;

 	if (get_user(frames, src))
 		return -EFAULT;
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		err = snd_pcm_playback_forward(substream, frames);
 	else
 		err = snd_pcm_capture_forward(substream, frames);
 	if (put_user(err, src))
 		return -EFAULT;
 	return err < 0 ? err : 0;
 }

 struct snd_pcm_hw_params32 {
 	u32 flags;
 	struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
 	struct snd_mask mres[5];	/* reserved masks */
 	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 	struct snd_interval ires[9];	/* reserved intervals */
 	u32 rmask;
 	u32 cmask;
 	u32 info;
 	u32 msbits;
 	u32 rate_num;
 	u32 rate_den;
 	u32 fifo_size;
 	unsigned char reserved[64];
 };

 struct snd_pcm_sw_params32 {
 	s32 tstamp_mode;
 	u32 period_step;
 	u32 sleep_min;
 	u32 avail_min;
 	u32 xfer_align;
 	u32 start_threshold;
 	u32 stop_threshold;
 	u32 silence_threshold;
 	u32 silence_size;
 	u32 boundary;
 	unsigned char reserved[64];
 };

 /* recalcuate the boundary within 32bit */
 static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
 {
 	snd_pcm_uframes_t boundary;

 	if (! runtime->buffer_size)
 		return 0;
 	boundary = runtime->buffer_size;
 	while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
 		boundary *= 2;
 	return boundary;
 }

 static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
 					  struct snd_pcm_sw_params32 __user *src)
 {
 	struct snd_pcm_sw_params params;
 	snd_pcm_uframes_t boundary;
 	int err;

 	memset(&params, 0, sizeof(params));
 	if (get_user(params.tstamp_mode, &src->tstamp_mode) ||
 	    get_user(params.period_step, &src->period_step) ||
 	    get_user(params.sleep_min, &src->sleep_min) ||
 	    get_user(params.avail_min, &src->avail_min) ||
 	    get_user(params.xfer_align, &src->xfer_align) ||
 	    get_user(params.start_threshold, &src->start_threshold) ||
 	    get_user(params.stop_threshold, &src->stop_threshold) ||
 	    get_user(params.silence_threshold, &src->silence_threshold) ||
 	    get_user(params.silence_size, &src->silence_size))
 		return -EFAULT;
 	/*
 	 * Check silent_size parameter.  Since we have 64bit boundary,
 	 * silence_size must be compared with the 32bit boundary.
 	 */
 	boundary = recalculate_boundary(substream->runtime);
 	if (boundary && params.silence_size >= boundary)
 		params.silence_size = substream->runtime->boundary;
 	err = snd_pcm_sw_params(substream, &params);
 	if (err < 0)
 		return err;
 	if (boundary && put_user(boundary, &src->boundary))
 		return -EFAULT;
 	return err;
 }

 struct snd_pcm_channel_info32 {
 	u32 channel;
 	u32 offset;
 	u32 first;
 	u32 step;
 };

 static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
 					     struct snd_pcm_channel_info32 __user *src)
 {
 	struct snd_pcm_channel_info info;
 	int err;

 	if (get_user(info.channel, &src->channel) ||
 	    get_user(info.offset, &src->offset) ||
 	    get_user(info.first, &src->first) ||
 	    get_user(info.step, &src->step))
 		return -EFAULT;
 	err = snd_pcm_channel_info(substream, &info);
 	if (err < 0)
 		return err;
 	if (put_user(info.channel, &src->channel) ||
 	    put_user(info.offset, &src->offset) ||
 	    put_user(info.first, &src->first) ||
 	    put_user(info.step, &src->step))
 		return -EFAULT;
 	return err;
 }

 struct snd_pcm_status32 {
 	s32 state;
 	struct compat_timespec trigger_tstamp;
 	struct compat_timespec tstamp;
 	u32 appl_ptr;
 	u32 hw_ptr;
 	s32 delay;
 	u32 avail;
 	u32 avail_max;
 	u32 overrange;
 	s32 suspended_state;
 	unsigned char reserved[60];
 } __attribute__((packed));


 static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
 				      struct snd_pcm_status32 __user *src)
 {
 	struct snd_pcm_status status;
 	int err;

 	err = snd_pcm_status(substream, &status);
 	if (err < 0)
 		return err;

 	if (put_user(status.state, &src->state) ||
 	    put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) ||
 	    put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) ||
 	    put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) ||
 	    put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) ||
 	    put_user(status.appl_ptr, &src->appl_ptr) ||
 	    put_user(status.hw_ptr, &src->hw_ptr) ||
 	    put_user(status.delay, &src->delay) ||
 	    put_user(status.avail, &src->avail) ||
 	    put_user(status.avail_max, &src->avail_max) ||
 	    put_user(status.overrange, &src->overrange) ||
 	    put_user(status.suspended_state, &src->suspended_state))
 		return -EFAULT;

 	return err;
 }

 /* both for HW_PARAMS and HW_REFINE */
 static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
 					  int refine,
 					  struct snd_pcm_hw_params32 __user *data32)
 {
 	struct snd_pcm_hw_params *data;
 	struct snd_pcm_runtime *runtime;
 	int err;

 	if (! (runtime = substream->runtime))
 		return -ENOTTY;

 	data = kmalloc(sizeof(*data), GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 	/* only fifo_size is different, so just copy all */
 	if (copy_from_user(data, data32, sizeof(*data32))) {
 		err = -EFAULT;
 		goto error;
 	}
 	if (refine)
 		err = snd_pcm_hw_refine(substream, data);
 	else
 		err = snd_pcm_hw_params(substream, data);
 	if (err < 0)
 		goto error;
 	if (copy_to_user(data32, data, sizeof(*data32)) ||
 	    put_user(data->fifo_size, &data32->fifo_size)) {
 		err = -EFAULT;
 		goto error;
 	}

 	if (! refine) {
 		unsigned int new_boundary = recalculate_boundary(runtime);
 		if (new_boundary)
 			runtime->boundary = new_boundary;
 	}
  error:
 	kfree(data);
 	return err;
 }


 /*
  */
 struct snd_xferi32 {
 	s32 result;
 	u32 buf;
 	u32 frames;
 };

 static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
 				      int dir, struct snd_xferi32 __user *data32)
 {
 	compat_caddr_t buf;
 	u32 frames;
 	int err;

 	if (! substream->runtime)
 		return -ENOTTY;
 	if (substream->stream != dir)
 		return -EINVAL;
 	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 		return -EBADFD;

 	if (get_user(buf, &data32->buf) ||
 	    get_user(frames, &data32->frames))
 		return -EFAULT;

 	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 		err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
 	else
 		err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
 	if (err < 0)
 		return err;
 	/* copy the result */
 	if (put_user(err, &data32->result))
 		return -EFAULT;
 	return 0;
 }


 /* snd_xfern needs remapping of bufs */
 struct snd_xfern32 {
 	s32 result;
 	u32 bufs;  /* this is void **; */
 	u32 frames;
 };

 /*
  * xfern ioctl nees to copy (up to) 128 pointers on stack.
  * although we may pass the copied pointers through f_op->ioctl, but the ioctl
  * handler there expands again the same 128 pointers on stack, so it is better
  * to handle the function (calling pcm_readv/writev) directly in this handler.
  */
 static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
 				      int dir, struct snd_xfern32 __user *data32)
 {
 	compat_caddr_t buf;
 	compat_caddr_t __user *bufptr;
 	u32 frames;
 	void __user **bufs;
 	int err, ch, i;

 	if (! substream->runtime)
 		return -ENOTTY;
 	if (substream->stream != dir)
 		return -EINVAL;

 	if ((ch = substream->runtime->channels) > 128)
 		return -EINVAL;
 	if (get_user(buf, &data32->bufs) ||
 	    get_user(frames, &data32->frames))
 		return -EFAULT;
 	bufptr = compat_ptr(buf);
 	bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
 	if (bufs == NULL)
 		return -ENOMEM;
 	for (i = 0; i < ch; i++) {
 		u32 ptr;
 		if (get_user(ptr, bufptr)) {
 			kfree(bufs);
 			return -EFAULT;
 		}
 		bufs[ch] = compat_ptr(ptr);
 		bufptr++;
 	}
 	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
 		err = snd_pcm_lib_writev(substream, bufs, frames);
 	else
 		err = snd_pcm_lib_readv(substream, bufs, frames);
 	if (err >= 0) {
 		if (put_user(err, &data32->result))
 			err = -EFAULT;
 	}
 	kfree(bufs);
 	return err;
 }


 struct snd_pcm_mmap_status32 {
 	s32 state;
 	s32 pad1;
 	u32 hw_ptr;
 	struct compat_timespec tstamp;
 	s32 suspended_state;
 } __attribute__((packed));

 struct snd_pcm_mmap_control32 {
 	u32 appl_ptr;
 	u32 avail_min;
 };

 struct snd_pcm_sync_ptr32 {
 	u32 flags;
 	union {
 		struct snd_pcm_mmap_status32 status;
 		unsigned char reserved[64];
 	} s;
 	union {
 		struct snd_pcm_mmap_control32 control;
 		unsigned char reserved[64];
 	} c;
 } __attribute__((packed));

 static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
 					 struct snd_pcm_sync_ptr32 __user *src)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	volatile struct snd_pcm_mmap_status *status;
 	volatile struct snd_pcm_mmap_control *control;
 	u32 sflags;
 	struct snd_pcm_mmap_control scontrol;
 	struct snd_pcm_mmap_status sstatus;
 	snd_pcm_uframes_t boundary;
 	int err;

 	snd_assert(runtime, return -EINVAL);

 	if (get_user(sflags, &src->flags) ||
 	    get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 	    get_user(scontrol.avail_min, &src->c.control.avail_min))
 		return -EFAULT;
 	if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 		err = snd_pcm_hwsync(substream);
 		if (err < 0)
 			return err;
 	}
 	status = runtime->status;
 	control = runtime->control;
 	boundary = recalculate_boundary(runtime);
 	if (! boundary)
 		boundary = 0x7fffffff;
 	snd_pcm_stream_lock_irq(substream);
 	/* FIXME: we should consider the boundary for the sync from app */
 	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 		control->appl_ptr = scontrol.appl_ptr;
 	else
 		scontrol.appl_ptr = control->appl_ptr % boundary;
 	if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 		control->avail_min = scontrol.avail_min;
 	else
 		scontrol.avail_min = control->avail_min;
 	sstatus.state = status->state;
 	sstatus.hw_ptr = status->hw_ptr % boundary;
 	sstatus.tstamp = status->tstamp;
 	sstatus.suspended_state = status->suspended_state;
 	snd_pcm_stream_unlock_irq(substream);
 	if (put_user(sstatus.state, &src->s.status.state) ||
 	    put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
 	    put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) ||
 	    put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) ||
 	    put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 	    put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 	    put_user(scontrol.avail_min, &src->c.control.avail_min))
 		return -EFAULT;

 	return 0;
 }


 /*
  */
 enum {
 	SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
 	SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
 	SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
 	SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
 	SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
 	SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
 	SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
 	SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
 	SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
 	SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
 	SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
 	SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
 	SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),

 };

 static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
 {
 	struct snd_pcm_file *pcm_file;
 	struct snd_pcm_substream *substream;
 	void __user *argp = compat_ptr(arg);

 	pcm_file = file->private_data;
 	if (! pcm_file)
 		return -ENOTTY;
 	substream = pcm_file->substream;
 	if (! substream)
 		return -ENOTTY;

 	/*
 	 * When PCM is used on 32bit mode, we need to disable
 	 * mmap of PCM status/control records because of the size
 	 * incompatibility.
 	 */
 	pcm_file->no_compat_mmap = 1;

 	switch (cmd) {
 	case SNDRV_PCM_IOCTL_PVERSION:
 	case SNDRV_PCM_IOCTL_INFO:
 	case SNDRV_PCM_IOCTL_TSTAMP:
 	case SNDRV_PCM_IOCTL_HWSYNC:
 	case SNDRV_PCM_IOCTL_PREPARE:
 	case SNDRV_PCM_IOCTL_RESET:
 	case SNDRV_PCM_IOCTL_START:
 	case SNDRV_PCM_IOCTL_DROP:
 	case SNDRV_PCM_IOCTL_DRAIN:
 	case SNDRV_PCM_IOCTL_PAUSE:
 	case SNDRV_PCM_IOCTL_HW_FREE:
 	case SNDRV_PCM_IOCTL_RESUME:
 	case SNDRV_PCM_IOCTL_XRUN:
 	case SNDRV_PCM_IOCTL_LINK:
 	case SNDRV_PCM_IOCTL_UNLINK:
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
 		else
 			return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
 	case SNDRV_PCM_IOCTL_HW_REFINE32:
 		return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
 	case SNDRV_PCM_IOCTL_HW_PARAMS32:
 		return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
 	case SNDRV_PCM_IOCTL_SW_PARAMS32:
 		return snd_pcm_ioctl_sw_params_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_STATUS32:
 		return snd_pcm_status_user_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_SYNC_PTR32:
 		return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
 		return snd_pcm_ioctl_channel_info_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
 		return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 	case SNDRV_PCM_IOCTL_READI_FRAMES32:
 		return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 	case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
 		return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
 	case SNDRV_PCM_IOCTL_READN_FRAMES32:
 		return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
 	case SNDRV_PCM_IOCTL_DELAY32:
 		return snd_pcm_ioctl_delay_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_REWIND32:
 		return snd_pcm_ioctl_rewind_compat(substream, argp);
 	case SNDRV_PCM_IOCTL_FORWARD32:
 		return snd_pcm_ioctl_forward_compat(substream, argp);
 	}

 	return -ENOIOCTLCMD;
 }
	/*
	* 32bit -> 64bit ioctl wrapper for PCM 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 pcm_native.c */

	#include <linux/compat.h>

	static int snd_pcm_ioctl_delay_compat(struct snd_pcm_substream *substream,
	s32 __user *src)
	{
	snd_pcm_sframes_t delay;
	mm_segment_t fs;
	int err;

	fs = snd_enter_user();
	err = snd_pcm_delay(substream, &delay);
	snd_leave_user(fs);
	if (err < 0)
	return err;
	if (put_user(delay, src))
	return -EFAULT;
	return err;
	}

	static int snd_pcm_ioctl_rewind_compat(struct snd_pcm_substream *substream,
	u32 __user *src)
	{
	snd_pcm_uframes_t frames;
	int err;

	if (get_user(frames, src))
	return -EFAULT;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	err = snd_pcm_playback_rewind(substream, frames);
	else
	err = snd_pcm_capture_rewind(substream, frames);
	if (put_user(err, src))
	return -EFAULT;
	return err < 0 ? err : 0;
	}

	static int snd_pcm_ioctl_forward_compat(struct snd_pcm_substream *substream,
	u32 __user *src)
	{
	snd_pcm_uframes_t frames;
	int err;

	if (get_user(frames, src))
	return -EFAULT;
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	err = snd_pcm_playback_forward(substream, frames);
	else
	err = snd_pcm_capture_forward(substream, frames);
	if (put_user(err, src))
	return -EFAULT;
	return err < 0 ? err : 0;
	}

	struct snd_pcm_hw_params32 {
	u32 flags;
	struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
	struct snd_mask mres[5]; /* reserved masks */
	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
	struct snd_interval ires[9]; /* reserved intervals */
	u32 rmask;
	u32 cmask;
	u32 info;
	u32 msbits;
	u32 rate_num;
	u32 rate_den;
	u32 fifo_size;
	unsigned char reserved[64];
	};

	struct snd_pcm_sw_params32 {
	s32 tstamp_mode;
	u32 period_step;
	u32 sleep_min;
	u32 avail_min;
	u32 xfer_align;
	u32 start_threshold;
	u32 stop_threshold;
	u32 silence_threshold;
	u32 silence_size;
	u32 boundary;
	unsigned char reserved[64];
	};

	/* recalcuate the boundary within 32bit */
	static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
	{
	snd_pcm_uframes_t boundary;

	if (! runtime->buffer_size)
	return 0;
	boundary = runtime->buffer_size;
	while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
	boundary *= 2;
	return boundary;
	}

	static int snd_pcm_ioctl_sw_params_compat(struct snd_pcm_substream *substream,
	struct snd_pcm_sw_params32 __user *src)
	{
	struct snd_pcm_sw_params params;
	snd_pcm_uframes_t boundary;
	int err;

	memset(&params, 0, sizeof(params));
	if (get_user(params.tstamp_mode, &src->tstamp_mode) \|\|
	get_user(params.period_step, &src->period_step) \|\|
	get_user(params.sleep_min, &src->sleep_min) \|\|
	get_user(params.avail_min, &src->avail_min) \|\|
	get_user(params.xfer_align, &src->xfer_align) \|\|
	get_user(params.start_threshold, &src->start_threshold) \|\|
	get_user(params.stop_threshold, &src->stop_threshold) \|\|
	get_user(params.silence_threshold, &src->silence_threshold) \|\|
	get_user(params.silence_size, &src->silence_size))
	return -EFAULT;
	/*
	* Check silent_size parameter. Since we have 64bit boundary,
	* silence_size must be compared with the 32bit boundary.
	*/
	boundary = recalculate_boundary(substream->runtime);
	if (boundary && params.silence_size >= boundary)
	params.silence_size = substream->runtime->boundary;
	err = snd_pcm_sw_params(substream, &params);
	if (err < 0)
	return err;
	if (boundary && put_user(boundary, &src->boundary))
	return -EFAULT;
	return err;
	}

	struct snd_pcm_channel_info32 {
	u32 channel;
	u32 offset;
	u32 first;
	u32 step;
	};

	static int snd_pcm_ioctl_channel_info_compat(struct snd_pcm_substream *substream,
	struct snd_pcm_channel_info32 __user *src)
	{
	struct snd_pcm_channel_info info;
	int err;

	if (get_user(info.channel, &src->channel) \|\|
	get_user(info.offset, &src->offset) \|\|
	get_user(info.first, &src->first) \|\|
	get_user(info.step, &src->step))
	return -EFAULT;
	err = snd_pcm_channel_info(substream, &info);
	if (err < 0)
	return err;
	if (put_user(info.channel, &src->channel) \|\|
	put_user(info.offset, &src->offset) \|\|
	put_user(info.first, &src->first) \|\|
	put_user(info.step, &src->step))
	return -EFAULT;
	return err;
	}

	struct snd_pcm_status32 {
	s32 state;
	struct compat_timespec trigger_tstamp;
	struct compat_timespec tstamp;
	u32 appl_ptr;
	u32 hw_ptr;
	s32 delay;
	u32 avail;
	u32 avail_max;
	u32 overrange;
	s32 suspended_state;
	unsigned char reserved[60];
	} __attribute__((packed));


	static int snd_pcm_status_user_compat(struct snd_pcm_substream *substream,
	struct snd_pcm_status32 __user *src)
	{
	struct snd_pcm_status status;
	int err;

	err = snd_pcm_status(substream, &status);
	if (err < 0)
	return err;

	if (put_user(status.state, &src->state) \|\|
	put_user(status.trigger_tstamp.tv_sec, &src->trigger_tstamp.tv_sec) \|\|
	put_user(status.trigger_tstamp.tv_nsec, &src->trigger_tstamp.tv_nsec) \|\|
	put_user(status.tstamp.tv_sec, &src->tstamp.tv_sec) \|\|
	put_user(status.tstamp.tv_nsec, &src->tstamp.tv_nsec) \|\|
	put_user(status.appl_ptr, &src->appl_ptr) \|\|
	put_user(status.hw_ptr, &src->hw_ptr) \|\|
	put_user(status.delay, &src->delay) \|\|
	put_user(status.avail, &src->avail) \|\|
	put_user(status.avail_max, &src->avail_max) \|\|
	put_user(status.overrange, &src->overrange) \|\|
	put_user(status.suspended_state, &src->suspended_state))
	return -EFAULT;

	return err;
	}

	/* both for HW_PARAMS and HW_REFINE */
	static int snd_pcm_ioctl_hw_params_compat(struct snd_pcm_substream *substream,
	int refine,
	struct snd_pcm_hw_params32 __user *data32)
	{
	struct snd_pcm_hw_params *data;
	struct snd_pcm_runtime *runtime;
	int err;

	if (! (runtime = substream->runtime))
	return -ENOTTY;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
	return -ENOMEM;
	/* only fifo_size is different, so just copy all */
	if (copy_from_user(data, data32, sizeof(*data32))) {
	err = -EFAULT;
	goto error;
	}
	if (refine)
	err = snd_pcm_hw_refine(substream, data);
	else
	err = snd_pcm_hw_params(substream, data);
	if (err < 0)
	goto error;
	if (copy_to_user(data32, data, sizeof(*data32)) \|\|
	put_user(data->fifo_size, &data32->fifo_size)) {
	err = -EFAULT;
	goto error;
	}

	if (! refine) {
	unsigned int new_boundary = recalculate_boundary(runtime);
	if (new_boundary)
	runtime->boundary = new_boundary;
	}
	error:
	kfree(data);
	return err;
	}


	/*
	*/
	struct snd_xferi32 {
	s32 result;
	u32 buf;
	u32 frames;
	};

	static int snd_pcm_ioctl_xferi_compat(struct snd_pcm_substream *substream,
	int dir, struct snd_xferi32 __user *data32)
	{
	compat_caddr_t buf;
	u32 frames;
	int err;

	if (! substream->runtime)
	return -ENOTTY;
	if (substream->stream != dir)
	return -EINVAL;
	if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
	return -EBADFD;

	if (get_user(buf, &data32->buf) \|\|
	get_user(frames, &data32->frames))
	return -EFAULT;

	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
	err = snd_pcm_lib_write(substream, compat_ptr(buf), frames);
	else
	err = snd_pcm_lib_read(substream, compat_ptr(buf), frames);
	if (err < 0)
	return err;
	/* copy the result */
	if (put_user(err, &data32->result))
	return -EFAULT;
	return 0;
	}


	/* snd_xfern needs remapping of bufs */
	struct snd_xfern32 {
	s32 result;
	u32 bufs; /* this is void *; /
	u32 frames;
	};

	/*
	* xfern ioctl nees to copy (up to) 128 pointers on stack.
	* although we may pass the copied pointers through f_op->ioctl, but the ioctl
	* handler there expands again the same 128 pointers on stack, so it is better
	* to handle the function (calling pcm_readv/writev) directly in this handler.
	*/
	static int snd_pcm_ioctl_xfern_compat(struct snd_pcm_substream *substream,
	int dir, struct snd_xfern32 __user *data32)
	{
	compat_caddr_t buf;
	compat_caddr_t __user *bufptr;
	u32 frames;
	void __user **bufs;
	int err, ch, i;

	if (! substream->runtime)
	return -ENOTTY;
	if (substream->stream != dir)
	return -EINVAL;

	if ((ch = substream->runtime->channels) > 128)
	return -EINVAL;
	if (get_user(buf, &data32->bufs) \|\|
	get_user(frames, &data32->frames))
	return -EFAULT;
	bufptr = compat_ptr(buf);
	bufs = kmalloc(sizeof(void __user ) ch, GFP_KERNEL);
	if (bufs == NULL)
	return -ENOMEM;
	for (i = 0; i < ch; i++) {
	u32 ptr;
	if (get_user(ptr, bufptr)) {
	kfree(bufs);
	return -EFAULT;
	}
	bufs[ch] = compat_ptr(ptr);
	bufptr++;
	}
	if (dir == SNDRV_PCM_STREAM_PLAYBACK)
	err = snd_pcm_lib_writev(substream, bufs, frames);
	else
	err = snd_pcm_lib_readv(substream, bufs, frames);
	if (err >= 0) {
	if (put_user(err, &data32->result))
	err = -EFAULT;
	}
	kfree(bufs);
	return err;
	}


	struct snd_pcm_mmap_status32 {
	s32 state;
	s32 pad1;
	u32 hw_ptr;
	struct compat_timespec tstamp;
	s32 suspended_state;
	} __attribute__((packed));

	struct snd_pcm_mmap_control32 {
	u32 appl_ptr;
	u32 avail_min;
	};

	struct snd_pcm_sync_ptr32 {
	u32 flags;
	union {
	struct snd_pcm_mmap_status32 status;
	unsigned char reserved[64];
	} s;
	union {
	struct snd_pcm_mmap_control32 control;
	unsigned char reserved[64];
	} c;
	} __attribute__((packed));

	static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
	struct snd_pcm_sync_ptr32 __user *src)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
	u32 sflags;
	struct snd_pcm_mmap_control scontrol;
	struct snd_pcm_mmap_status sstatus;
	snd_pcm_uframes_t boundary;
	int err;

	snd_assert(runtime, return -EINVAL);

	if (get_user(sflags, &src->flags) \|\|
	get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) \|\|
	get_user(scontrol.avail_min, &src->c.control.avail_min))
	return -EFAULT;
	if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
	err = snd_pcm_hwsync(substream);
	if (err < 0)
	return err;
	}
	status = runtime->status;
	control = runtime->control;
	boundary = recalculate_boundary(runtime);
	if (! boundary)
	boundary = 0x7fffffff;
	snd_pcm_stream_lock_irq(substream);
	/* FIXME: we should consider the boundary for the sync from app */
	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
	control->appl_ptr = scontrol.appl_ptr;
	else
	scontrol.appl_ptr = control->appl_ptr % boundary;
	if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
	control->avail_min = scontrol.avail_min;
	else
	scontrol.avail_min = control->avail_min;
	sstatus.state = status->state;
	sstatus.hw_ptr = status->hw_ptr % boundary;
	sstatus.tstamp = status->tstamp;
	sstatus.suspended_state = status->suspended_state;
	snd_pcm_stream_unlock_irq(substream);
	if (put_user(sstatus.state, &src->s.status.state) \|\|
	put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) \|\|
	put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp.tv_sec) \|\|
	put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp.tv_nsec) \|\|
	put_user(sstatus.suspended_state, &src->s.status.suspended_state) \|\|
	put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) \|\|
	put_user(scontrol.avail_min, &src->c.control.avail_min))
	return -EFAULT;

	return 0;
	}


	/*
	*/
	enum {
	SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
	SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
	SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
	SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
	SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
	SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
	SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
	SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
	SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
	SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
	SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
	SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
	SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),

	};

	static long snd_pcm_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	{
	struct snd_pcm_file *pcm_file;
	struct snd_pcm_substream *substream;
	void __user *argp = compat_ptr(arg);

	pcm_file = file->private_data;
	if (! pcm_file)
	return -ENOTTY;
	substream = pcm_file->substream;
	if (! substream)
	return -ENOTTY;

	/*
	* When PCM is used on 32bit mode, we need to disable
	* mmap of PCM status/control records because of the size
	* incompatibility.
	*/
	pcm_file->no_compat_mmap = 1;

	switch (cmd) {
	case SNDRV_PCM_IOCTL_PVERSION:
	case SNDRV_PCM_IOCTL_INFO:
	case SNDRV_PCM_IOCTL_TSTAMP:
	case SNDRV_PCM_IOCTL_HWSYNC:
	case SNDRV_PCM_IOCTL_PREPARE:
	case SNDRV_PCM_IOCTL_RESET:
	case SNDRV_PCM_IOCTL_START:
	case SNDRV_PCM_IOCTL_DROP:
	case SNDRV_PCM_IOCTL_DRAIN:
	case SNDRV_PCM_IOCTL_PAUSE:
	case SNDRV_PCM_IOCTL_HW_FREE:
	case SNDRV_PCM_IOCTL_RESUME:
	case SNDRV_PCM_IOCTL_XRUN:
	case SNDRV_PCM_IOCTL_LINK:
	case SNDRV_PCM_IOCTL_UNLINK:
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return snd_pcm_playback_ioctl1(file, substream, cmd, argp);
	else
	return snd_pcm_capture_ioctl1(file, substream, cmd, argp);
	case SNDRV_PCM_IOCTL_HW_REFINE32:
	return snd_pcm_ioctl_hw_params_compat(substream, 1, argp);
	case SNDRV_PCM_IOCTL_HW_PARAMS32:
	return snd_pcm_ioctl_hw_params_compat(substream, 0, argp);
	case SNDRV_PCM_IOCTL_SW_PARAMS32:
	return snd_pcm_ioctl_sw_params_compat(substream, argp);
	case SNDRV_PCM_IOCTL_STATUS32:
	return snd_pcm_status_user_compat(substream, argp);
	case SNDRV_PCM_IOCTL_SYNC_PTR32:
	return snd_pcm_ioctl_sync_ptr_compat(substream, argp);
	case SNDRV_PCM_IOCTL_CHANNEL_INFO32:
	return snd_pcm_ioctl_channel_info_compat(substream, argp);
	case SNDRV_PCM_IOCTL_WRITEI_FRAMES32:
	return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
	case SNDRV_PCM_IOCTL_READI_FRAMES32:
	return snd_pcm_ioctl_xferi_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
	case SNDRV_PCM_IOCTL_WRITEN_FRAMES32:
	return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_PLAYBACK, argp);
	case SNDRV_PCM_IOCTL_READN_FRAMES32:
	return snd_pcm_ioctl_xfern_compat(substream, SNDRV_PCM_STREAM_CAPTURE, argp);
	case SNDRV_PCM_IOCTL_DELAY32:
	return snd_pcm_ioctl_delay_compat(substream, argp);
	case SNDRV_PCM_IOCTL_REWIND32:
	return snd_pcm_ioctl_rewind_compat(substream, argp);
	case SNDRV_PCM_IOCTL_FORWARD32:
	return snd_pcm_ioctl_forward_compat(substream, argp);
	}

	return -ENOIOCTLCMD;
	}