[linux-2.6-block.git] / sound / core / control_compat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * compat ioctls for control API
 *
 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
 */

/* this file included from control.c */

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

struct snd_ctl_elem_list32 {
	u32 offset;
	u32 space;
	u32 used;
	u32 count;
	u32 pids;
	unsigned char reserved[50];
} /* don't set packed attribute here */;

static int snd_ctl_elem_list_compat(struct snd_card *card,
				    struct snd_ctl_elem_list32 __user *data32)
{
	struct snd_ctl_elem_list __user *data;
	compat_caddr_t ptr;
	int err;

	data = compat_alloc_user_space(sizeof(*data));

	/* offset, space, used, count */
	if (copy_in_user(data, data32, 4 * sizeof(u32)))
		return -EFAULT;
	/* pids */
	if (get_user(ptr, &data32->pids) ||
	    put_user(compat_ptr(ptr), &data->pids))
		return -EFAULT;
	err = snd_ctl_elem_list(card, data);
	if (err < 0)
		return err;
	/* copy the result */
	if (copy_in_user(data32, data, 4 * sizeof(u32)))
		return -EFAULT;
	return 0;
}

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

struct snd_ctl_elem_info32 {
	struct snd_ctl_elem_id id; // the size of struct is same
	s32 type;
	u32 access;
	u32 count;
	s32 owner;
	union {
		struct {
			s32 min;
			s32 max;
			s32 step;
		} integer;
		struct {
			u64 min;
			u64 max;
			u64 step;
		} integer64;
		struct {
			u32 items;
			u32 item;
			char name[64];
			u64 names_ptr;
			u32 names_length;
		} enumerated;
		unsigned char reserved[128];
	} value;
	unsigned char reserved[64];
} __attribute__((packed));

static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
				    struct snd_ctl_elem_info32 __user *data32)
{
	struct snd_ctl_elem_info *data;
	int err;

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

	err = -EFAULT;
	/* copy id */
	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
		goto error;
	/* we need to copy the item index.
	 * hope this doesn't break anything..
	 */
	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
		goto error;

	err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
	if (err < 0)
		goto error;
	err = snd_ctl_elem_info(ctl, data);
	if (err < 0)
		goto error;
	/* restore info to 32bit */
	err = -EFAULT;
	/* id, type, access, count */
	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) ||
	    copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
		goto error;
	if (put_user(data->owner, &data32->owner))
		goto error;
	switch (data->type) {
	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	case SNDRV_CTL_ELEM_TYPE_INTEGER:
		if (put_user(data->value.integer.min, &data32->value.integer.min) ||
		    put_user(data->value.integer.max, &data32->value.integer.max) ||
		    put_user(data->value.integer.step, &data32->value.integer.step))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		if (copy_to_user(&data32->value.integer64,
				 &data->value.integer64,
				 sizeof(data->value.integer64)))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		if (copy_to_user(&data32->value.enumerated,
				 &data->value.enumerated,
				 sizeof(data->value.enumerated)))
			goto error;
		break;
	default:
		break;
	}
	err = 0;
 error:
	kfree(data);
	return err;
}

/* read / write */
struct snd_ctl_elem_value32 {
	struct snd_ctl_elem_id id;
	unsigned int indirect;	/* bit-field causes misalignment */
        union {
		s32 integer[128];
		unsigned char data[512];
#ifndef CONFIG_X86_64
		s64 integer64[64];
#endif
        } value;
        unsigned char reserved[128];
};

#ifdef CONFIG_X86_X32
/* x32 has a different alignment for 64bit values from ia32 */
struct snd_ctl_elem_value_x32 {
	struct snd_ctl_elem_id id;
	unsigned int indirect;	/* bit-field causes misalignment */
	union {
		s32 integer[128];
		unsigned char data[512];
		s64 integer64[64];
	} value;
	unsigned char reserved[128];
};
#endif /* CONFIG_X86_X32 */

/* 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)
{
	struct snd_kcontrol *kctl;
	struct snd_ctl_elem_info *info;
	int err;

	down_read(&card->controls_rwsem);
	kctl = snd_ctl_find_id(card, id);
	if (! kctl) {
		up_read(&card->controls_rwsem);
		return -ENOENT;
	}
	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (info == NULL) {
		up_read(&card->controls_rwsem);
		return -ENOMEM;
	}
	info->id = *id;
	err = kctl->info(kctl, info);
	up_read(&card->controls_rwsem);
	if (err >= 0) {
		err = info->type;
		*countp = info->count;
	}
	kfree(info);
	return err;
}

static int get_elem_size(int type, int count)
{
	switch (type) {
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		return sizeof(s64) * count;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		return sizeof(int) * count;
	case SNDRV_CTL_ELEM_TYPE_BYTES:
		return 512;
	case SNDRV_CTL_ELEM_TYPE_IEC958:
		return sizeof(struct snd_aes_iec958);
	default:
		return -1;
	}
}

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)
{
	struct snd_ctl_elem_value32 __user *data32 = userdata;
	int i, type, size;
	int uninitialized_var(count);
	unsigned int indirect;

	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
		return -EFAULT;
	if (get_user(indirect, &data32->indirect))
		return -EFAULT;
	if (indirect)
		return -EINVAL;
	type = get_ctl_type(card, &data->id, &count);
	if (type < 0)
		return type;

	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
		for (i = 0; i < count; i++) {
			s32 __user *intp = valuep;
			int val;
			if (get_user(val, &intp[i]))
				return -EFAULT;
			data->value.integer.value[i] = val;
		}
	} else {
		size = get_elem_size(type, count);
		if (size < 0) {
			dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
			return -EINVAL;
		}
		if (copy_from_user(data->value.bytes.data, valuep, size))
			return -EFAULT;
	}

	*typep = type;
	*countp = count;
	return 0;
}

/* 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)
{
	int i, size;

	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
		for (i = 0; i < count; i++) {
			s32 __user *intp = valuep;
			int val;
			val = data->value.integer.value[i];
			if (put_user(val, &intp[i]))
				return -EFAULT;
		}
	} else {
		size = get_elem_size(type, count);
		if (copy_to_user(valuep, data->value.bytes.data, size))
			return -EFAULT;
	}
	return 0;
}

static int ctl_elem_read_user(struct snd_card *card,
			      void __user *userdata, void __user *valuep)
{
	struct snd_ctl_elem_value *data;
	int err, type, count;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	err = copy_ctl_value_from_user(card, data, userdata, valuep,
				       &type, &count);
	if (err < 0)
		goto error;

	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
	if (err < 0)
		goto error;
	err = snd_ctl_elem_read(card, data);
	if (err < 0)
		goto error;
	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 error:
	kfree(data);
	return err;
}

static int ctl_elem_write_user(struct snd_ctl_file *file,
			       void __user *userdata, void __user *valuep)
{
	struct snd_ctl_elem_value *data;
	struct snd_card *card = file->card;
	int err, type, count;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (data == NULL)
		return -ENOMEM;

	err = copy_ctl_value_from_user(card, data, userdata, valuep,
				       &type, &count);
	if (err < 0)
		goto error;

	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
	if (err < 0)
		goto error;
	err = snd_ctl_elem_write(card, file, data);
	if (err < 0)
		goto error;
	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
 error:
	kfree(data);
	return err;
}

static int snd_ctl_elem_read_user_compat(struct snd_card *card,
					 struct snd_ctl_elem_value32 __user *data32)
{
	return ctl_elem_read_user(card, data32, &data32->value);
}

static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
					  struct snd_ctl_elem_value32 __user *data32)
{
	return ctl_elem_write_user(file, data32, &data32->value);
}

#ifdef CONFIG_X86_X32
static int snd_ctl_elem_read_user_x32(struct snd_card *card,
				      struct snd_ctl_elem_value_x32 __user *data32)
{
	return ctl_elem_read_user(card, data32, &data32->value);
}

static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
				       struct snd_ctl_elem_value_x32 __user *data32)
{
	return ctl_elem_write_user(file, data32, &data32->value);
}
#endif /* CONFIG_X86_X32 */

/* 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)
{
	struct snd_ctl_elem_info *data;
	int err;

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

	err = -EFAULT;
	/* id, type, access, count */ \
	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) ||
	    copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
		goto error;
	if (get_user(data->owner, &data32->owner))
		goto error;
	switch (data->type) {
	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	case SNDRV_CTL_ELEM_TYPE_INTEGER:
		if (get_user(data->value.integer.min, &data32->value.integer.min) ||
		    get_user(data->value.integer.max, &data32->value.integer.max) ||
		    get_user(data->value.integer.step, &data32->value.integer.step))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
		if (copy_from_user(&data->value.integer64,
				   &data32->value.integer64,
				   sizeof(data->value.integer64)))
			goto error;
		break;
	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
		if (copy_from_user(&data->value.enumerated,
				   &data32->value.enumerated,
				   sizeof(data->value.enumerated)))
			goto error;
		data->value.enumerated.names_ptr =
			(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
		break;
	default:
		break;
	}
	err = snd_ctl_elem_add(file, data, replace);
 error:
	kfree(data);
	return err;
}  

enum {
	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
#ifdef CONFIG_X86_X32
	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
#endif /* CONFIG_X86_X32 */
};

static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct snd_ctl_file *ctl;
	struct snd_kctl_ioctl *p;
	void __user *argp = compat_ptr(arg);
	int err;

	ctl = file->private_data;
	if (snd_BUG_ON(!ctl || !ctl->card))
		return -ENXIO;

	switch (cmd) {
	case SNDRV_CTL_IOCTL_PVERSION:
	case SNDRV_CTL_IOCTL_CARD_INFO:
	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	case SNDRV_CTL_IOCTL_POWER:
	case SNDRV_CTL_IOCTL_POWER_STATE:
	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	case SNDRV_CTL_IOCTL_TLV_READ:
	case SNDRV_CTL_IOCTL_TLV_WRITE:
	case SNDRV_CTL_IOCTL_TLV_COMMAND:
		return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	case SNDRV_CTL_IOCTL_ELEM_LIST32:
		return snd_ctl_elem_list_compat(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_INFO32:
		return snd_ctl_elem_info_compat(ctl, argp);
	case SNDRV_CTL_IOCTL_ELEM_READ32:
		return snd_ctl_elem_read_user_compat(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
		return snd_ctl_elem_write_user_compat(ctl, argp);
	case SNDRV_CTL_IOCTL_ELEM_ADD32:
		return snd_ctl_elem_add_compat(ctl, argp, 0);
	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
		return snd_ctl_elem_add_compat(ctl, argp, 1);
#ifdef CONFIG_X86_X32
	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
		return snd_ctl_elem_read_user_x32(ctl->card, argp);
	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
		return snd_ctl_elem_write_user_x32(ctl, argp);
#endif /* CONFIG_X86_X32 */
	}

	down_read(&snd_ioctl_rwsem);
	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
		if (p->fioctl) {
			err = p->fioctl(ctl->card, ctl, cmd, arg);
			if (err != -ENOIOCTLCMD) {
				up_read(&snd_ioctl_rwsem);
				return err;
			}
		}
	}
	up_read(&snd_ioctl_rwsem);
	return -ENOIOCTLCMD;
}
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* compat ioctls for control API
	4	*
	5	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
1da177e4 LT	6	*/
	7
	8	/* this file included from control.c */
	9
	10	#include <linux/compat.h>
5a0e3ad6	11	#include <linux/slab.h>
1da177e4	12
82e9bae6	13	struct snd_ctl_elem_list32 {
1da177e4 LT	14	u32 offset;
	15	u32 space;
	16	u32 used;
	17	u32 count;
	18	u32 pids;
	19	unsigned char reserved[50];
	20	} /* don't set packed attribute here */;
	21
82e9bae6 TI	22	static int snd_ctl_elem_list_compat(struct snd_card *card,
82e9bae6 TI	23	struct snd_ctl_elem_list32 __user *data32)
1da177e4	24	{
82e9bae6	25	struct snd_ctl_elem_list __user *data;
1da177e4 LT	26	compat_caddr_t ptr;
	27	int err;
	28
	29	data = compat_alloc_user_space(sizeof(*data));
	30
	31	/* offset, space, used, count */
	32	if (copy_in_user(data, data32, 4 * sizeof(u32)))
	33	return -EFAULT;
	34	/* pids */
	35	if (get_user(ptr, &data32->pids) \|\|
	36	put_user(compat_ptr(ptr), &data->pids))
	37	return -EFAULT;
	38	err = snd_ctl_elem_list(card, data);
	39	if (err < 0)
	40	return err;
	41	/* copy the result */
	42	if (copy_in_user(data32, data, 4 * sizeof(u32)))
	43	return -EFAULT;
	44	return 0;
	45	}
	46
	47	/*
	48	* control element info
	49	* it uses union, so the things are not easy..
	50	*/
	51
82e9bae6 TI	52	struct snd_ctl_elem_info32 {
82e9bae6 TI	53	struct snd_ctl_elem_id id; // the size of struct is same
1da177e4 LT	54	s32 type;
	55	u32 access;
	56	u32 count;
	57	s32 owner;
	58	union {
	59	struct {
	60	s32 min;
	61	s32 max;
	62	s32 step;
	63	} integer;
	64	struct {
	65	u64 min;
	66	u64 max;
	67	u64 step;
	68	} integer64;
	69	struct {
	70	u32 items;
	71	u32 item;
	72	char name[64];
8d448162 CL	73	u64 names_ptr;
8d448162 CL	74	u32 names_length;
1da177e4 LT	75	} enumerated;
	76	unsigned char reserved[128];
	77	} value;
	78	unsigned char reserved[64];
	79	} __attribute__((packed));
	80
82e9bae6 TI	81	static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
82e9bae6 TI	82	struct snd_ctl_elem_info32 __user *data32)
1da177e4	83	{
82e9bae6	84	struct snd_ctl_elem_info *data;
1da177e4 LT	85	int err;
1da177e4 LT	86
ca2c0966	87	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	88	if (! data)
	89	return -ENOMEM;
	90
	91	err = -EFAULT;
	92	/* copy id */
	93	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	94	goto error;
	95	/* we need to copy the item index.
	96	* hope this doesn't break anything..
	97	*/
	98	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
	99	goto error;
64649400	100
cbac4b0c	101	err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	102	if (err < 0)
	103	goto error;
	104	err = snd_ctl_elem_info(ctl, data);
1da177e4 LT	105	if (err < 0)
	106	goto error;
	107	/* restore info to 32bit */
	108	err = -EFAULT;
	109	/* id, type, access, count */
	110	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) \|\|
	111	copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
	112	goto error;
	113	if (put_user(data->owner, &data32->owner))
	114	goto error;
	115	switch (data->type) {
	116	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	117	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	118	if (put_user(data->value.integer.min, &data32->value.integer.min) \|\|
	119	put_user(data->value.integer.max, &data32->value.integer.max) \|\|
	120	put_user(data->value.integer.step, &data32->value.integer.step))
	121	goto error;
	122	break;
	123	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	124	if (copy_to_user(&data32->value.integer64,
	125	&data->value.integer64,
	126	sizeof(data->value.integer64)))
	127	goto error;
	128	break;
	129	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	130	if (copy_to_user(&data32->value.enumerated,
	131	&data->value.enumerated,
	132	sizeof(data->value.enumerated)))
	133	goto error;
	134	break;
	135	default:
	136	break;
	137	}
	138	err = 0;
	139	error:
	140	kfree(data);
	141	return err;
	142	}
	143
	144	/* read / write */
82e9bae6 TI	145	struct snd_ctl_elem_value32 {
82e9bae6 TI	146	struct snd_ctl_elem_id id;
1da177e4 LT	147	unsigned int indirect; /* bit-field causes misalignment */
	148	union {
	149	s32 integer[128];
	150	unsigned char data[512];
	151	#ifndef CONFIG_X86_64
	152	s64 integer64[64];
	153	#endif
	154	} value;
	155	unsigned char reserved[128];
	156	};
	157
6236d8bb TI	158	#ifdef CONFIG_X86_X32
	159	/* x32 has a different alignment for 64bit values from ia32 */
	160	struct snd_ctl_elem_value_x32 {
	161	struct snd_ctl_elem_id id;
	162	unsigned int indirect; /* bit-field causes misalignment */
	163	union {
	164	s32 integer[128];
	165	unsigned char data[512];
	166	s64 integer64[64];
	167	} value;
	168	unsigned char reserved[128];
	169	};
	170	#endif /* CONFIG_X86_X32 */
1da177e4 LT	171
1da177e4 LT	172	/* get the value type and count of the control */
82e9bae6 TI	173	static int get_ctl_type(struct snd_card card, struct snd_ctl_elem_id id,
82e9bae6 TI	174	int *countp)
1da177e4	175	{
82e9bae6	176	struct snd_kcontrol *kctl;
aa657ca9	177	struct snd_ctl_elem_info *info;
1da177e4 LT	178	int err;
	179
	180	down_read(&card->controls_rwsem);
	181	kctl = snd_ctl_find_id(card, id);
	182	if (! kctl) {
	183	up_read(&card->controls_rwsem);
6f021744	184	return -ENOENT;
1da177e4	185	}
aa657ca9 JK	186	info = kzalloc(sizeof(*info), GFP_KERNEL);
	187	if (info == NULL) {
	188	up_read(&card->controls_rwsem);
	189	return -ENOMEM;
	190	}
	191	info->id = *id;
	192	err = kctl->info(kctl, info);
1da177e4 LT	193	up_read(&card->controls_rwsem);
1da177e4 LT	194	if (err >= 0) {
aa657ca9 JK	195	err = info->type;
aa657ca9 JK	196	*countp = info->count;
1da177e4	197	}
aa657ca9	198	kfree(info);
1da177e4 LT	199	return err;
	200	}
	201
	202	static int get_elem_size(int type, int count)
	203	{
	204	switch (type) {
	205	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	206	return sizeof(s64) * count;
	207	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	208	return sizeof(int) * count;
	209	case SNDRV_CTL_ELEM_TYPE_BYTES:
	210	return 512;
	211	case SNDRV_CTL_ELEM_TYPE_IEC958:
82e9bae6	212	return sizeof(struct snd_aes_iec958);
1da177e4 LT	213	default:
	214	return -1;
	215	}
	216	}
	217
82e9bae6 TI	218	static int copy_ctl_value_from_user(struct snd_card *card,
82e9bae6 TI	219	struct snd_ctl_elem_value *data,
6236d8bb TI	220	void __user *userdata,
6236d8bb TI	221	void __user *valuep,
1da177e4 LT	222	int typep, int countp)
1da177e4 LT	223	{
6236d8bb	224	struct snd_ctl_elem_value32 __user *data32 = userdata;
5050b092 AM	225	int i, type, size;
5050b092 AM	226	int uninitialized_var(count);
1da177e4 LT	227	unsigned int indirect;
	228
	229	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	230	return -EFAULT;
	231	if (get_user(indirect, &data32->indirect))
	232	return -EFAULT;
	233	if (indirect)
	234	return -EINVAL;
	235	type = get_ctl_type(card, &data->id, &count);
	236	if (type < 0)
	237	return type;
	238
	239	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	240	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	241	for (i = 0; i < count; i++) {
6236d8bb	242	s32 __user *intp = valuep;
1da177e4	243	int val;
6236d8bb	244	if (get_user(val, &intp[i]))
1da177e4 LT	245	return -EFAULT;
	246	data->value.integer.value[i] = val;
	247	}
	248	} else {
	249	size = get_elem_size(type, count);
	250	if (size < 0) {
bb009457	251	dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
1da177e4 LT	252	return -EINVAL;
1da177e4 LT	253	}
6236d8bb	254	if (copy_from_user(data->value.bytes.data, valuep, size))
1da177e4 LT	255	return -EFAULT;
	256	}
	257
	258	*typep = type;
	259	*countp = count;
	260	return 0;
	261	}
	262
	263	/* restore the value to 32bit */
6236d8bb TI	264	static int copy_ctl_value_to_user(void __user *userdata,
6236d8bb TI	265	void __user *valuep,
82e9bae6	266	struct snd_ctl_elem_value *data,
1da177e4 LT	267	int type, int count)
	268	{
	269	int i, size;
	270
	271	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	272	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	273	for (i = 0; i < count; i++) {
6236d8bb	274	s32 __user *intp = valuep;
1da177e4 LT	275	int val;
1da177e4 LT	276	val = data->value.integer.value[i];
6236d8bb	277	if (put_user(val, &intp[i]))
1da177e4 LT	278	return -EFAULT;
	279	}
	280	} else {
	281	size = get_elem_size(type, count);
6236d8bb	282	if (copy_to_user(valuep, data->value.bytes.data, size))
1da177e4 LT	283	return -EFAULT;
	284	}
	285	return 0;
	286	}
	287
6236d8bb TI	288	static int ctl_elem_read_user(struct snd_card *card,
6236d8bb TI	289	void __user userdata, void __user valuep)
1da177e4	290	{
82e9bae6	291	struct snd_ctl_elem_value *data;
1da177e4 LT	292	int err, type, count;
1da177e4 LT	293
ca2c0966	294	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	295	if (data == NULL)
	296	return -ENOMEM;
	297
6236d8bb TI	298	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	299	&type, &count);
	300	if (err < 0)
1da177e4	301	goto error;
64649400	302
cbac4b0c	303	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	304	if (err < 0)
	305	goto error;
	306	err = snd_ctl_elem_read(card, data);
	307	if (err < 0)
	308	goto error;
	309	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	310	error:
	311	kfree(data);
	312	return err;
	313	}
	314
6236d8bb TI	315	static int ctl_elem_write_user(struct snd_ctl_file *file,
6236d8bb TI	316	void __user userdata, void __user valuep)
1da177e4	317	{
82e9bae6	318	struct snd_ctl_elem_value *data;
64649400	319	struct snd_card *card = file->card;
1da177e4 LT	320	int err, type, count;
1da177e4 LT	321
ca2c0966	322	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	323	if (data == NULL)
	324	return -ENOMEM;
	325
6236d8bb TI	326	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	327	&type, &count);
	328	if (err < 0)
1da177e4	329	goto error;
64649400	330
cbac4b0c	331	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	332	if (err < 0)
	333	goto error;
	334	err = snd_ctl_elem_write(card, file, data);
	335	if (err < 0)
	336	goto error;
	337	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	338	error:
	339	kfree(data);
	340	return err;
	341	}
	342
6236d8bb TI	343	static int snd_ctl_elem_read_user_compat(struct snd_card *card,
	344	struct snd_ctl_elem_value32 __user *data32)
	345	{
	346	return ctl_elem_read_user(card, data32, &data32->value);
	347	}
	348
	349	static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
	350	struct snd_ctl_elem_value32 __user *data32)
	351	{
	352	return ctl_elem_write_user(file, data32, &data32->value);
	353	}
	354
	355	#ifdef CONFIG_X86_X32
	356	static int snd_ctl_elem_read_user_x32(struct snd_card *card,
	357	struct snd_ctl_elem_value_x32 __user *data32)
	358	{
	359	return ctl_elem_read_user(card, data32, &data32->value);
	360	}
	361
	362	static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
	363	struct snd_ctl_elem_value_x32 __user *data32)
	364	{
	365	return ctl_elem_write_user(file, data32, &data32->value);
	366	}
	367	#endif /* CONFIG_X86_X32 */
	368
1da177e4	369	/* add or replace a user control */
82e9bae6 TI	370	static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
82e9bae6 TI	371	struct snd_ctl_elem_info32 __user *data32,
1da177e4 LT	372	int replace)
1da177e4 LT	373	{
82e9bae6	374	struct snd_ctl_elem_info *data;
1da177e4 LT	375	int err;
1da177e4 LT	376
ca2c0966	377	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	378	if (! data)
	379	return -ENOMEM;
	380
	381	err = -EFAULT;
	382	/* id, type, access, count */ \
	383	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) \|\|
	384	copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
	385	goto error;
3f12888d	386	if (get_user(data->owner, &data32->owner))
1da177e4 LT	387	goto error;
	388	switch (data->type) {
	389	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	390	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	391	if (get_user(data->value.integer.min, &data32->value.integer.min) \|\|
	392	get_user(data->value.integer.max, &data32->value.integer.max) \|\|
	393	get_user(data->value.integer.step, &data32->value.integer.step))
	394	goto error;
	395	break;
	396	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	397	if (copy_from_user(&data->value.integer64,
	398	&data32->value.integer64,
	399	sizeof(data->value.integer64)))
	400	goto error;
	401	break;
	402	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	403	if (copy_from_user(&data->value.enumerated,
	404	&data32->value.enumerated,
	405	sizeof(data->value.enumerated)))
	406	goto error;
8d448162 CL	407	data->value.enumerated.names_ptr =
8d448162 CL	408	(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
1da177e4 LT	409	break;
	410	default:
	411	break;
	412	}
	413	err = snd_ctl_elem_add(file, data, replace);
	414	error:
	415	kfree(data);
	416	return err;
	417	}
	418
	419	enum {
82e9bae6 TI	420	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	421	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	422	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	423	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	424	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	425	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
6236d8bb TI	426	#ifdef CONFIG_X86_X32
	427	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	428	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
	429	#endif /* CONFIG_X86_X32 */
1da177e4 LT	430	};
	431
	432	static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	433	{
82e9bae6	434	struct snd_ctl_file *ctl;
9244b2c3	435	struct snd_kctl_ioctl *p;
1da177e4 LT	436	void __user *argp = compat_ptr(arg);
	437	int err;
	438
	439	ctl = file->private_data;
7eaa943c TI	440	if (snd_BUG_ON(!ctl \|\| !ctl->card))
7eaa943c TI	441	return -ENXIO;
1da177e4 LT	442
	443	switch (cmd) {
	444	case SNDRV_CTL_IOCTL_PVERSION:
	445	case SNDRV_CTL_IOCTL_CARD_INFO:
	446	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	447	case SNDRV_CTL_IOCTL_POWER:
	448	case SNDRV_CTL_IOCTL_POWER_STATE:
	449	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	450	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
2b1181ed TI	451	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	452	case SNDRV_CTL_IOCTL_TLV_READ:
	453	case SNDRV_CTL_IOCTL_TLV_WRITE:
	454	case SNDRV_CTL_IOCTL_TLV_COMMAND:
1da177e4 LT	455	return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	456	case SNDRV_CTL_IOCTL_ELEM_LIST32:
	457	return snd_ctl_elem_list_compat(ctl->card, argp);
	458	case SNDRV_CTL_IOCTL_ELEM_INFO32:
	459	return snd_ctl_elem_info_compat(ctl, argp);
	460	case SNDRV_CTL_IOCTL_ELEM_READ32:
	461	return snd_ctl_elem_read_user_compat(ctl->card, argp);
	462	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
	463	return snd_ctl_elem_write_user_compat(ctl, argp);
	464	case SNDRV_CTL_IOCTL_ELEM_ADD32:
	465	return snd_ctl_elem_add_compat(ctl, argp, 0);
	466	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
	467	return snd_ctl_elem_add_compat(ctl, argp, 1);
6236d8bb TI	468	#ifdef CONFIG_X86_X32
	469	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
	470	return snd_ctl_elem_read_user_x32(ctl->card, argp);
	471	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
	472	return snd_ctl_elem_write_user_x32(ctl, argp);
	473	#endif /* CONFIG_X86_X32 */
1da177e4 LT	474	}
	475
	476	down_read(&snd_ioctl_rwsem);
9244b2c3	477	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
1da177e4 LT	478	if (p->fioctl) {
	479	err = p->fioctl(ctl->card, ctl, cmd, arg);
	480	if (err != -ENOIOCTLCMD) {
	481	up_read(&snd_ioctl_rwsem);
	482	return err;
	483	}
	484	}
	485	}
	486	up_read(&snd_ioctl_rwsem);
	487	return -ENOIOCTLCMD;
	488	}