linux/sound/core/control_compat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * compat ioctls for control API
 *
 *   Copyright (c) by Takashi Iwai <[email protected]>
 */

/* this file included from control.c */

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

struct snd_ctl_elem_list32 { … } /* don't set packed attribute here */;

static int snd_ctl_elem_list_compat(struct snd_card *card,
				    struct snd_ctl_elem_list32 __user *data32)
{ … }

/*
 * control element info
 * it uses union, so the things are not easy..
 */

struct snd_ctl_elem_info32 { … } __packed;

static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
				    struct snd_ctl_elem_info32 __user *data32)
{ … }

/* read / write */
struct snd_ctl_elem_value32 { … };

#ifdef CONFIG_X86_X32_ABI
/* x32 has a different alignment for 64bit values from ia32 */
struct snd_ctl_elem_value_x32 { … };
#endif /* CONFIG_X86_X32_ABI */

/* get the value type and count of the control */
static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
			int *countp)
{ … }

static int get_elem_size(snd_ctl_elem_type_t type, int count)
{ … }

static int copy_ctl_value_from_user(struct snd_card *card,
				    struct snd_ctl_elem_value *data,
				    void __user *userdata,
				    void __user *valuep,
				    int *typep, int *countp)
{ … }

/* restore the value to 32bit */
static int copy_ctl_value_to_user(void __user *userdata,
				  void __user *valuep,
				  struct snd_ctl_elem_value *data,
				  int type, int count)
{ … }

static int __ctl_elem_read_user(struct snd_card *card,
				void __user *userdata, void __user *valuep)
{ … }

static int ctl_elem_read_user(struct snd_card *card,
			      void __user *userdata, void __user *valuep)
{ … }

static int __ctl_elem_write_user(struct snd_ctl_file *file,
				 void __user *userdata, void __user *valuep)
{ … }

static int ctl_elem_write_user(struct snd_ctl_file *file,
			       void __user *userdata, void __user *valuep)
{ … }

static int snd_ctl_elem_read_user_compat(struct snd_card *card,
					 struct snd_ctl_elem_value32 __user *data32)
{ … }

static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
					  struct snd_ctl_elem_value32 __user *data32)
{ … }

#ifdef CONFIG_X86_X32_ABI
static int snd_ctl_elem_read_user_x32(struct snd_card *card,
				      struct snd_ctl_elem_value_x32 __user *data32)
{ … }

static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
				       struct snd_ctl_elem_value_x32 __user *data32)
{ … }
#endif /* CONFIG_X86_X32_ABI */

/* add or replace a user control */
static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
				   struct snd_ctl_elem_info32 __user *data32,
				   int replace)
{ … }  

enum { … };

static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{ … }