sound/core/pcm_compat.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *   32bit -> 64bit ioctl wrapper for PCM API
  *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
  */

 /* This file included from pcm_native.c */

 #include <linux/compat.h>
 #include <linux/slab.h>

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

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

 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;
 	err = snd_pcm_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;
 	err = snd_pcm_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;
 	u32 proto;
 	u32 tstamp_type;
 	unsigned char reserved[56];
 };

 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) ||
 	    get_user(params.tstamp_type, &src->tstamp_type) ||
 	    get_user(params.proto, &src->proto))
 		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;
 }

 #ifdef CONFIG_X86_X32_ABI
 /* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
 				     struct snd_pcm_channel_info __user *src);
 #define snd_pcm_ioctl_channel_info_x32(s, p)	\
 	snd_pcm_channel_info_user(s, p)
 #endif /* CONFIG_X86_X32_ABI */

 struct compat_snd_pcm_status64 {
 	snd_pcm_state_t state;
 	u8 rsvd[4]; /* alignment */
 	s64 trigger_tstamp_sec;
 	s64 trigger_tstamp_nsec;
 	s64 tstamp_sec;
 	s64 tstamp_nsec;
 	u32 appl_ptr;
 	u32 hw_ptr;
 	s32 delay;
 	u32 avail;
 	u32 avail_max;
 	u32 overrange;
 	snd_pcm_state_t suspended_state;
 	u32 audio_tstamp_data;
 	s64 audio_tstamp_sec;
 	s64 audio_tstamp_nsec;
 	s64 driver_tstamp_sec;
 	s64 driver_tstamp_nsec;
 	u32 audio_tstamp_accuracy;
 	unsigned char reserved[52-4*sizeof(s64)];
 } __packed;

 static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream,
 					struct compat_snd_pcm_status64 __user *src,
 					bool ext)
 {
 	struct snd_pcm_status64 status;
 	struct compat_snd_pcm_status64 compat_status64;
 	int err;

 	memset(&status, 0, sizeof(status));
 	memset(&compat_status64, 0, sizeof(compat_status64));
 	/*
 	 * with extension, parameters are read/write,
 	 * get audio_tstamp_data from user,
 	 * ignore rest of status structure
 	 */
 	if (ext && get_user(status.audio_tstamp_data,
 				(u32 __user *)(&src->audio_tstamp_data)))
 		return -EFAULT;
 	err = snd_pcm_status64(substream, &status);
 	if (err < 0)
 		return err;

 	if (clear_user(src, sizeof(*src)))
 		return -EFAULT;

 	compat_status64 = (struct compat_snd_pcm_status64) {
 		.state = status.state,
 		.trigger_tstamp_sec = status.trigger_tstamp_sec,
 		.trigger_tstamp_nsec = status.trigger_tstamp_nsec,
 		.tstamp_sec = status.tstamp_sec,
 		.tstamp_nsec = status.tstamp_nsec,
 		.appl_ptr = status.appl_ptr,
 		.hw_ptr = status.hw_ptr,
 		.delay = status.delay,
 		.avail = status.avail,
 		.avail_max = status.avail_max,
 		.overrange = status.overrange,
 		.suspended_state = status.suspended_state,
 		.audio_tstamp_data = status.audio_tstamp_data,
 		.audio_tstamp_sec = status.audio_tstamp_sec,
 		.audio_tstamp_nsec = status.audio_tstamp_nsec,
 		.driver_tstamp_sec = status.audio_tstamp_sec,
 		.driver_tstamp_nsec = status.audio_tstamp_nsec,
 		.audio_tstamp_accuracy = status.audio_tstamp_accuracy,
 	};

 	if (copy_to_user(src, &compat_status64, sizeof(compat_status64)))
 		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;

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

 	data = kmalloc(sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	/* only fifo_size (RO from userspace) 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 (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
 		return -EBADFD;

 	ch = substream->runtime->channels;
 	if (ch > 128)
 		return -EINVAL;
 	if (get_user(buf, &data32->bufs) ||
 	    get_user(frames, &data32->frames))
 		return -EFAULT;
 	bufptr = compat_ptr(buf);
 	bufs = kmalloc_array(ch, sizeof(void __user *), 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[i] = 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;
 }

 #ifdef CONFIG_X86_X32_ABI
 /* X32 ABI has 64bit timespec and 64bit alignment */
 struct snd_pcm_mmap_status_x32 {
 	snd_pcm_state_t state;
 	s32 pad1;
 	u32 hw_ptr;
 	u32 pad2; /* alignment */
 	s64 tstamp_sec;
 	s64 tstamp_nsec;
 	snd_pcm_state_t suspended_state;
 	s32 pad3;
 	s64 audio_tstamp_sec;
 	s64 audio_tstamp_nsec;
 } __packed;

 struct snd_pcm_mmap_control_x32 {
 	u32 appl_ptr;
 	u32 avail_min;
 };

 struct snd_pcm_sync_ptr_x32 {
 	u32 flags;
 	u32 rsvd; /* alignment */
 	union {
 		struct snd_pcm_mmap_status_x32 status;
 		unsigned char reserved[64];
 	} s;
 	union {
 		struct snd_pcm_mmap_control_x32 control;
 		unsigned char reserved[64];
 	} c;
 } __packed;

 static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
 				      struct snd_pcm_sync_ptr_x32 __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;

 	if (snd_BUG_ON(!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;
 	sstatus.audio_tstamp = status->audio_tstamp;
 	snd_pcm_stream_unlock_irq(substream);
 	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
 		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
 	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_sec) ||
 	    put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
 	    put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
 	    put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
 	    put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
 	    put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
 	    put_user(scontrol.avail_min, &src->c.control.avail_min))
 		return -EFAULT;

 	return 0;
 }
 #endif /* CONFIG_X86_X32_ABI */

 #ifdef __BIG_ENDIAN
 typedef char __pad_before_u32[4];
 typedef char __pad_after_u32[0];
 #else
 typedef char __pad_before_u32[0];
 typedef char __pad_after_u32[4];
 #endif

 /* PCM 2.0.15 API definition had a bug in mmap control; it puts the avail_min
  * at the wrong offset due to a typo in padding type.
  * The bug hits only 32bit.
  * A workaround for incorrect read/write is needed only in 32bit compat mode.
  */
 struct __snd_pcm_mmap_control64_buggy {
 	__pad_before_u32 __pad1;
 	__u32 appl_ptr;
 	__pad_before_u32 __pad2;	/* SiC! here is the bug */
 	__pad_before_u32 __pad3;
 	__u32 avail_min;
 	__pad_after_uframe __pad4;
 };

 static int snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream *substream,
 					struct snd_pcm_sync_ptr __user *_sync_ptr)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_pcm_sync_ptr sync_ptr;
 	struct __snd_pcm_mmap_control64_buggy *sync_cp;
 	volatile struct snd_pcm_mmap_status *status;
 	volatile struct snd_pcm_mmap_control *control;
 	int err;

 	memset(&sync_ptr, 0, sizeof(sync_ptr));
 	sync_cp = (struct __snd_pcm_mmap_control64_buggy *)&sync_ptr.c.control;
 	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
 		return -EFAULT;
 	if (copy_from_user(sync_cp, &(_sync_ptr->c.control), sizeof(*sync_cp)))
 		return -EFAULT;
 	status = runtime->status;
 	control = runtime->control;
 	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
 		err = snd_pcm_hwsync(substream);
 		if (err < 0)
 			return err;
 	}
 	snd_pcm_stream_lock_irq(substream);
 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
 		err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
 		if (err < 0) {
 			snd_pcm_stream_unlock_irq(substream);
 			return err;
 		}
 	} else {
 		sync_cp->appl_ptr = control->appl_ptr;
 	}
 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
 		control->avail_min = sync_cp->avail_min;
 	else
 		sync_cp->avail_min = control->avail_min;
 	sync_ptr.s.status.state = status->state;
 	sync_ptr.s.status.hw_ptr = status->hw_ptr;
 	sync_ptr.s.status.tstamp = status->tstamp;
 	sync_ptr.s.status.suspended_state = status->suspended_state;
 	sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
 	snd_pcm_stream_unlock_irq(substream);
 	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
 		snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
 	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
 		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_STATUS_COMPAT32 = _IOR('A', 0x20, struct snd_pcm_status32),
 	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32 = _IOWR('A', 0x24, 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_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64),
 	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64),
 #ifdef CONFIG_X86_X32_ABI
 	SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
 	SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
 #endif /* CONFIG_X86_X32_ABI */
 };

 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 the old 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_TTSTAMP:
 	case SNDRV_PCM_IOCTL_USER_PVERSION:
 	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:
 	case __SNDRV_PCM_IOCTL_SYNC_PTR32:
 		return snd_pcm_common_ioctl(file, substream, cmd, argp);
 	case __SNDRV_PCM_IOCTL_SYNC_PTR64:
 #ifdef CONFIG_X86_X32_ABI
 		if (in_x32_syscall())
 			return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
 #endif /* CONFIG_X86_X32_ABI */
 		return snd_pcm_ioctl_sync_ptr_buggy(substream, 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_STATUS_COMPAT32:
 		return snd_pcm_status_user32(substream, argp, false);
 	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32:
 		return snd_pcm_status_user32(substream, argp, true);
 	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);
 	case SNDRV_PCM_IOCTL_STATUS_COMPAT64:
 		return snd_pcm_status_user_compat64(substream, argp, false);
 	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64:
 		return snd_pcm_status_user_compat64(substream, argp, true);
 #ifdef CONFIG_X86_X32_ABI
 	case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
 		return snd_pcm_ioctl_channel_info_x32(substream, argp);
 #endif /* CONFIG_X86_X32_ABI */
 	}

 	return -ENOIOCTLCMD;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* 32bit -> 64bit ioctl wrapper for PCM API
	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	*/

	/* This file included from pcm_native.c */

	#include <linux/compat.h>
	#include <linux/slab.h>

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

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

	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;
	err = snd_pcm_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;
	err = snd_pcm_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;
	u32 proto;
	u32 tstamp_type;
	unsigned char reserved[56];
	};

	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) \|\|
	get_user(params.tstamp_type, &src->tstamp_type) \|\|
	get_user(params.proto, &src->proto))
	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;
	}

	#ifdef CONFIG_X86_X32_ABI
	/* X32 ABI has the same struct as x86-64 for snd_pcm_channel_info */
	static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
	struct snd_pcm_channel_info __user *src);
	#define snd_pcm_ioctl_channel_info_x32(s, p) \
	snd_pcm_channel_info_user(s, p)
	#endif /* CONFIG_X86_X32_ABI */

	struct compat_snd_pcm_status64 {
	snd_pcm_state_t state;
	u8 rsvd[4]; /* alignment */
	s64 trigger_tstamp_sec;
	s64 trigger_tstamp_nsec;
	s64 tstamp_sec;
	s64 tstamp_nsec;
	u32 appl_ptr;
	u32 hw_ptr;
	s32 delay;
	u32 avail;
	u32 avail_max;
	u32 overrange;
	snd_pcm_state_t suspended_state;
	u32 audio_tstamp_data;
	s64 audio_tstamp_sec;
	s64 audio_tstamp_nsec;
	s64 driver_tstamp_sec;
	s64 driver_tstamp_nsec;
	u32 audio_tstamp_accuracy;
	unsigned char reserved[52-4*sizeof(s64)];
	} __packed;

	static int snd_pcm_status_user_compat64(struct snd_pcm_substream *substream,
	struct compat_snd_pcm_status64 __user *src,
	bool ext)
	{
	struct snd_pcm_status64 status;
	struct compat_snd_pcm_status64 compat_status64;
	int err;

	memset(&status, 0, sizeof(status));
	memset(&compat_status64, 0, sizeof(compat_status64));
	/*
	* with extension, parameters are read/write,
	* get audio_tstamp_data from user,
	* ignore rest of status structure
	*/
	if (ext && get_user(status.audio_tstamp_data,
	(u32 __user *)(&src->audio_tstamp_data)))
	return -EFAULT;
	err = snd_pcm_status64(substream, &status);
	if (err < 0)
	return err;

	if (clear_user(src, sizeof(*src)))
	return -EFAULT;

	compat_status64 = (struct compat_snd_pcm_status64) {
	.state = status.state,
	.trigger_tstamp_sec = status.trigger_tstamp_sec,
	.trigger_tstamp_nsec = status.trigger_tstamp_nsec,
	.tstamp_sec = status.tstamp_sec,
	.tstamp_nsec = status.tstamp_nsec,
	.appl_ptr = status.appl_ptr,
	.hw_ptr = status.hw_ptr,
	.delay = status.delay,
	.avail = status.avail,
	.avail_max = status.avail_max,
	.overrange = status.overrange,
	.suspended_state = status.suspended_state,
	.audio_tstamp_data = status.audio_tstamp_data,
	.audio_tstamp_sec = status.audio_tstamp_sec,
	.audio_tstamp_nsec = status.audio_tstamp_nsec,
	.driver_tstamp_sec = status.audio_tstamp_sec,
	.driver_tstamp_nsec = status.audio_tstamp_nsec,
	.audio_tstamp_accuracy = status.audio_tstamp_accuracy,
	};

	if (copy_to_user(src, &compat_status64, sizeof(compat_status64)))
	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;

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

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	/* only fifo_size (RO from userspace) 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 (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
	return -EBADFD;

	ch = substream->runtime->channels;
	if (ch > 128)
	return -EINVAL;
	if (get_user(buf, &data32->bufs) \|\|
	get_user(frames, &data32->frames))
	return -EFAULT;
	bufptr = compat_ptr(buf);
	bufs = kmalloc_array(ch, sizeof(void __user *), 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[i] = 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;
	}

	#ifdef CONFIG_X86_X32_ABI
	/* X32 ABI has 64bit timespec and 64bit alignment */
	struct snd_pcm_mmap_status_x32 {
	snd_pcm_state_t state;
	s32 pad1;
	u32 hw_ptr;
	u32 pad2; /* alignment */
	s64 tstamp_sec;
	s64 tstamp_nsec;
	snd_pcm_state_t suspended_state;
	s32 pad3;
	s64 audio_tstamp_sec;
	s64 audio_tstamp_nsec;
	} __packed;

	struct snd_pcm_mmap_control_x32 {
	u32 appl_ptr;
	u32 avail_min;
	};

	struct snd_pcm_sync_ptr_x32 {
	u32 flags;
	u32 rsvd; /* alignment */
	union {
	struct snd_pcm_mmap_status_x32 status;
	unsigned char reserved[64];
	} s;
	union {
	struct snd_pcm_mmap_control_x32 control;
	unsigned char reserved[64];
	} c;
	} __packed;

	static int snd_pcm_ioctl_sync_ptr_x32(struct snd_pcm_substream *substream,
	struct snd_pcm_sync_ptr_x32 __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;

	if (snd_BUG_ON(!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;
	sstatus.audio_tstamp = status->audio_tstamp;
	snd_pcm_stream_unlock_irq(substream);
	if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
	snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
	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_sec) \|\|
	put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) \|\|
	put_user(sstatus.suspended_state, &src->s.status.suspended_state) \|\|
	put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) \|\|
	put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) \|\|
	put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) \|\|
	put_user(scontrol.avail_min, &src->c.control.avail_min))
	return -EFAULT;

	return 0;
	}
	#endif /* CONFIG_X86_X32_ABI */

	#ifdef __BIG_ENDIAN
	typedef char __pad_before_u32[4];
	typedef char __pad_after_u32[0];
	#else
	typedef char __pad_before_u32[0];
	typedef char __pad_after_u32[4];
	#endif

	/* PCM 2.0.15 API definition had a bug in mmap control; it puts the avail_min
	* at the wrong offset due to a typo in padding type.
	* The bug hits only 32bit.
	* A workaround for incorrect read/write is needed only in 32bit compat mode.
	*/
	struct __snd_pcm_mmap_control64_buggy {
	__pad_before_u32 __pad1;
	__u32 appl_ptr;
	__pad_before_u32 __pad2; /* SiC! here is the bug */
	__pad_before_u32 __pad3;
	__u32 avail_min;
	__pad_after_uframe __pad4;
	};

	static int snd_pcm_ioctl_sync_ptr_buggy(struct snd_pcm_substream *substream,
	struct snd_pcm_sync_ptr __user *_sync_ptr)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_pcm_sync_ptr sync_ptr;
	struct __snd_pcm_mmap_control64_buggy *sync_cp;
	volatile struct snd_pcm_mmap_status *status;
	volatile struct snd_pcm_mmap_control *control;
	int err;

	memset(&sync_ptr, 0, sizeof(sync_ptr));
	sync_cp = (struct __snd_pcm_mmap_control64_buggy *)&sync_ptr.c.control;
	if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
	return -EFAULT;
	if (copy_from_user(sync_cp, &(_sync_ptr->c.control), sizeof(*sync_cp)))
	return -EFAULT;
	status = runtime->status;
	control = runtime->control;
	if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
	err = snd_pcm_hwsync(substream);
	if (err < 0)
	return err;
	}
	snd_pcm_stream_lock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) {
	err = pcm_lib_apply_appl_ptr(substream, sync_cp->appl_ptr);
	if (err < 0) {
	snd_pcm_stream_unlock_irq(substream);
	return err;
	}
	} else {
	sync_cp->appl_ptr = control->appl_ptr;
	}
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
	control->avail_min = sync_cp->avail_min;
	else
	sync_cp->avail_min = control->avail_min;
	sync_ptr.s.status.state = status->state;
	sync_ptr.s.status.hw_ptr = status->hw_ptr;
	sync_ptr.s.status.tstamp = status->tstamp;
	sync_ptr.s.status.suspended_state = status->suspended_state;
	sync_ptr.s.status.audio_tstamp = status->audio_tstamp;
	snd_pcm_stream_unlock_irq(substream);
	if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
	snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
	if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
	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_STATUS_COMPAT32 = _IOR('A', 0x20, struct snd_pcm_status32),
	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32 = _IOWR('A', 0x24, 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_STATUS_COMPAT64 = _IOR('A', 0x20, struct compat_snd_pcm_status64),
	SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64 = _IOWR('A', 0x24, struct compat_snd_pcm_status64),
	#ifdef CONFIG_X86_X32_ABI
	SNDRV_PCM_IOCTL_CHANNEL_INFO_X32 = _IOR('A', 0x32, struct snd_pcm_channel_info),
	SNDRV_PCM_IOCTL_SYNC_PTR_X32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr_x32),
	#endif /* CONFIG_X86_X32_ABI */
	};

	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 the old 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_TTSTAMP:
	case SNDRV_PCM_IOCTL_USER_PVERSION:
	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:
	case __SNDRV_PCM_IOCTL_SYNC_PTR32:
	return snd_pcm_common_ioctl(file, substream, cmd, argp);
	case __SNDRV_PCM_IOCTL_SYNC_PTR64:
	#ifdef CONFIG_X86_X32_ABI
	if (in_x32_syscall())
	return snd_pcm_ioctl_sync_ptr_x32(substream, argp);
	#endif /* CONFIG_X86_X32_ABI */
	return snd_pcm_ioctl_sync_ptr_buggy(substream, 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_STATUS_COMPAT32:
	return snd_pcm_status_user32(substream, argp, false);
	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT32:
	return snd_pcm_status_user32(substream, argp, true);
	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);
	case SNDRV_PCM_IOCTL_STATUS_COMPAT64:
	return snd_pcm_status_user_compat64(substream, argp, false);
	case SNDRV_PCM_IOCTL_STATUS_EXT_COMPAT64:
	return snd_pcm_status_user_compat64(substream, argp, true);
	#ifdef CONFIG_X86_X32_ABI
	case SNDRV_PCM_IOCTL_CHANNEL_INFO_X32:
	return snd_pcm_ioctl_channel_info_x32(substream, argp);
	#endif /* CONFIG_X86_X32_ABI */
	}

	return -ENOIOCTLCMD;
	}