[mirror_ubuntu-bionic-kernel.git] / sound / core / control_compat.c

/*
 * compat ioctls for control 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 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
1da177e4 LT	1	/*
	2	* compat ioctls for control API
	3	*
	4	* Copyright (c) by Takashi Iwai <tiwai@suse.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	/* this file included from control.c */
	22
	23	#include <linux/compat.h>
5a0e3ad6	24	#include <linux/slab.h>
1da177e4	25
82e9bae6	26	struct snd_ctl_elem_list32 {
1da177e4 LT	27	u32 offset;
	28	u32 space;
	29	u32 used;
	30	u32 count;
	31	u32 pids;
	32	unsigned char reserved[50];
	33	} /* don't set packed attribute here */;
	34
82e9bae6 TI	35	static int snd_ctl_elem_list_compat(struct snd_card *card,
82e9bae6 TI	36	struct snd_ctl_elem_list32 __user *data32)
1da177e4	37	{
82e9bae6	38	struct snd_ctl_elem_list __user *data;
1da177e4 LT	39	compat_caddr_t ptr;
	40	int err;
	41
	42	data = compat_alloc_user_space(sizeof(*data));
	43
	44	/* offset, space, used, count */
	45	if (copy_in_user(data, data32, 4 * sizeof(u32)))
	46	return -EFAULT;
	47	/* pids */
	48	if (get_user(ptr, &data32->pids) \|\|
	49	put_user(compat_ptr(ptr), &data->pids))
	50	return -EFAULT;
	51	err = snd_ctl_elem_list(card, data);
	52	if (err < 0)
	53	return err;
	54	/* copy the result */
	55	if (copy_in_user(data32, data, 4 * sizeof(u32)))
	56	return -EFAULT;
	57	return 0;
	58	}
	59
	60	/*
	61	* control element info
	62	* it uses union, so the things are not easy..
	63	*/
	64
82e9bae6 TI	65	struct snd_ctl_elem_info32 {
82e9bae6 TI	66	struct snd_ctl_elem_id id; // the size of struct is same
1da177e4 LT	67	s32 type;
	68	u32 access;
	69	u32 count;
	70	s32 owner;
	71	union {
	72	struct {
	73	s32 min;
	74	s32 max;
	75	s32 step;
	76	} integer;
	77	struct {
	78	u64 min;
	79	u64 max;
	80	u64 step;
	81	} integer64;
	82	struct {
	83	u32 items;
	84	u32 item;
	85	char name[64];
8d448162 CL	86	u64 names_ptr;
8d448162 CL	87	u32 names_length;
1da177e4 LT	88	} enumerated;
	89	unsigned char reserved[128];
	90	} value;
	91	unsigned char reserved[64];
	92	} __attribute__((packed));
	93
82e9bae6 TI	94	static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
82e9bae6 TI	95	struct snd_ctl_elem_info32 __user *data32)
1da177e4	96	{
82e9bae6	97	struct snd_ctl_elem_info *data;
1da177e4 LT	98	int err;
1da177e4 LT	99
ca2c0966	100	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	101	if (! data)
	102	return -ENOMEM;
	103
	104	err = -EFAULT;
	105	/* copy id */
	106	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	107	goto error;
	108	/* we need to copy the item index.
	109	* hope this doesn't break anything..
	110	*/
	111	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
	112	goto error;
64649400	113
cbac4b0c	114	err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	115	if (err < 0)
	116	goto error;
	117	err = snd_ctl_elem_info(ctl, data);
1da177e4 LT	118	if (err < 0)
	119	goto error;
	120	/* restore info to 32bit */
	121	err = -EFAULT;
	122	/* id, type, access, count */
	123	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) \|\|
	124	copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
	125	goto error;
	126	if (put_user(data->owner, &data32->owner))
	127	goto error;
	128	switch (data->type) {
	129	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	130	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	131	if (put_user(data->value.integer.min, &data32->value.integer.min) \|\|
	132	put_user(data->value.integer.max, &data32->value.integer.max) \|\|
	133	put_user(data->value.integer.step, &data32->value.integer.step))
	134	goto error;
	135	break;
	136	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	137	if (copy_to_user(&data32->value.integer64,
	138	&data->value.integer64,
	139	sizeof(data->value.integer64)))
	140	goto error;
	141	break;
	142	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	143	if (copy_to_user(&data32->value.enumerated,
	144	&data->value.enumerated,
	145	sizeof(data->value.enumerated)))
	146	goto error;
	147	break;
	148	default:
	149	break;
	150	}
	151	err = 0;
	152	error:
	153	kfree(data);
	154	return err;
	155	}
	156
	157	/* read / write */
82e9bae6 TI	158	struct snd_ctl_elem_value32 {
82e9bae6 TI	159	struct snd_ctl_elem_id id;
1da177e4 LT	160	unsigned int indirect; /* bit-field causes misalignment */
	161	union {
	162	s32 integer[128];
	163	unsigned char data[512];
	164	#ifndef CONFIG_X86_64
	165	s64 integer64[64];
	166	#endif
	167	} value;
	168	unsigned char reserved[128];
	169	};
	170
6236d8bb TI	171	#ifdef CONFIG_X86_X32
	172	/* x32 has a different alignment for 64bit values from ia32 */
	173	struct snd_ctl_elem_value_x32 {
	174	struct snd_ctl_elem_id id;
	175	unsigned int indirect; /* bit-field causes misalignment */
	176	union {
	177	s32 integer[128];
	178	unsigned char data[512];
	179	s64 integer64[64];
	180	} value;
	181	unsigned char reserved[128];
	182	};
	183	#endif /* CONFIG_X86_X32 */
1da177e4 LT	184
1da177e4 LT	185	/* get the value type and count of the control */
82e9bae6 TI	186	static int get_ctl_type(struct snd_card card, struct snd_ctl_elem_id id,
82e9bae6 TI	187	int *countp)
1da177e4	188	{
82e9bae6	189	struct snd_kcontrol *kctl;
aa657ca9	190	struct snd_ctl_elem_info *info;
1da177e4 LT	191	int err;
	192
	193	down_read(&card->controls_rwsem);
	194	kctl = snd_ctl_find_id(card, id);
	195	if (! kctl) {
	196	up_read(&card->controls_rwsem);
6f021744	197	return -ENOENT;
1da177e4	198	}
aa657ca9 JK	199	info = kzalloc(sizeof(*info), GFP_KERNEL);
	200	if (info == NULL) {
	201	up_read(&card->controls_rwsem);
	202	return -ENOMEM;
	203	}
	204	info->id = *id;
	205	err = kctl->info(kctl, info);
1da177e4 LT	206	up_read(&card->controls_rwsem);
1da177e4 LT	207	if (err >= 0) {
aa657ca9 JK	208	err = info->type;
aa657ca9 JK	209	*countp = info->count;
1da177e4	210	}
aa657ca9	211	kfree(info);
1da177e4 LT	212	return err;
	213	}
	214
	215	static int get_elem_size(int type, int count)
	216	{
	217	switch (type) {
	218	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	219	return sizeof(s64) * count;
	220	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	221	return sizeof(int) * count;
	222	case SNDRV_CTL_ELEM_TYPE_BYTES:
	223	return 512;
	224	case SNDRV_CTL_ELEM_TYPE_IEC958:
82e9bae6	225	return sizeof(struct snd_aes_iec958);
1da177e4 LT	226	default:
	227	return -1;
	228	}
	229	}
	230
82e9bae6 TI	231	static int copy_ctl_value_from_user(struct snd_card *card,
82e9bae6 TI	232	struct snd_ctl_elem_value *data,
6236d8bb TI	233	void __user *userdata,
6236d8bb TI	234	void __user *valuep,
1da177e4 LT	235	int typep, int countp)
1da177e4 LT	236	{
6236d8bb	237	struct snd_ctl_elem_value32 __user *data32 = userdata;
5050b092 AM	238	int i, type, size;
5050b092 AM	239	int uninitialized_var(count);
1da177e4 LT	240	unsigned int indirect;
	241
	242	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	243	return -EFAULT;
	244	if (get_user(indirect, &data32->indirect))
	245	return -EFAULT;
	246	if (indirect)
	247	return -EINVAL;
	248	type = get_ctl_type(card, &data->id, &count);
	249	if (type < 0)
	250	return type;
	251
	252	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	253	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	254	for (i = 0; i < count; i++) {
6236d8bb	255	s32 __user *intp = valuep;
1da177e4	256	int val;
6236d8bb	257	if (get_user(val, &intp[i]))
1da177e4 LT	258	return -EFAULT;
	259	data->value.integer.value[i] = val;
	260	}
	261	} else {
	262	size = get_elem_size(type, count);
	263	if (size < 0) {
bb009457	264	dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
1da177e4 LT	265	return -EINVAL;
1da177e4 LT	266	}
6236d8bb	267	if (copy_from_user(data->value.bytes.data, valuep, size))
1da177e4 LT	268	return -EFAULT;
	269	}
	270
	271	*typep = type;
	272	*countp = count;
	273	return 0;
	274	}
	275
	276	/* restore the value to 32bit */
6236d8bb TI	277	static int copy_ctl_value_to_user(void __user *userdata,
6236d8bb TI	278	void __user *valuep,
82e9bae6	279	struct snd_ctl_elem_value *data,
1da177e4 LT	280	int type, int count)
	281	{
	282	int i, size;
	283
	284	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	285	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	286	for (i = 0; i < count; i++) {
6236d8bb	287	s32 __user *intp = valuep;
1da177e4 LT	288	int val;
1da177e4 LT	289	val = data->value.integer.value[i];
6236d8bb	290	if (put_user(val, &intp[i]))
1da177e4 LT	291	return -EFAULT;
	292	}
	293	} else {
	294	size = get_elem_size(type, count);
6236d8bb	295	if (copy_to_user(valuep, data->value.bytes.data, size))
1da177e4 LT	296	return -EFAULT;
	297	}
	298	return 0;
	299	}
	300
6236d8bb TI	301	static int ctl_elem_read_user(struct snd_card *card,
6236d8bb TI	302	void __user userdata, void __user valuep)
1da177e4	303	{
82e9bae6	304	struct snd_ctl_elem_value *data;
1da177e4 LT	305	int err, type, count;
1da177e4 LT	306
ca2c0966	307	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	308	if (data == NULL)
	309	return -ENOMEM;
	310
6236d8bb TI	311	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	312	&type, &count);
	313	if (err < 0)
1da177e4	314	goto error;
64649400	315
cbac4b0c	316	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	317	if (err < 0)
	318	goto error;
	319	err = snd_ctl_elem_read(card, data);
	320	if (err < 0)
	321	goto error;
	322	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	323	error:
	324	kfree(data);
	325	return err;
	326	}
	327
6236d8bb TI	328	static int ctl_elem_write_user(struct snd_ctl_file *file,
6236d8bb TI	329	void __user userdata, void __user valuep)
1da177e4	330	{
82e9bae6	331	struct snd_ctl_elem_value *data;
64649400	332	struct snd_card *card = file->card;
1da177e4 LT	333	int err, type, count;
1da177e4 LT	334
ca2c0966	335	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	336	if (data == NULL)
	337	return -ENOMEM;
	338
6236d8bb TI	339	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	340	&type, &count);
	341	if (err < 0)
1da177e4	342	goto error;
64649400	343
cbac4b0c	344	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
7d8e8292 TI	345	if (err < 0)
	346	goto error;
	347	err = snd_ctl_elem_write(card, file, data);
	348	if (err < 0)
	349	goto error;
	350	err = copy_ctl_value_to_user(userdata, valuep, data, type, count);
1da177e4 LT	351	error:
	352	kfree(data);
	353	return err;
	354	}
	355
6236d8bb TI	356	static int snd_ctl_elem_read_user_compat(struct snd_card *card,
	357	struct snd_ctl_elem_value32 __user *data32)
	358	{
	359	return ctl_elem_read_user(card, data32, &data32->value);
	360	}
	361
	362	static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
	363	struct snd_ctl_elem_value32 __user *data32)
	364	{
	365	return ctl_elem_write_user(file, data32, &data32->value);
	366	}
	367
	368	#ifdef CONFIG_X86_X32
	369	static int snd_ctl_elem_read_user_x32(struct snd_card *card,
	370	struct snd_ctl_elem_value_x32 __user *data32)
	371	{
	372	return ctl_elem_read_user(card, data32, &data32->value);
	373	}
	374
	375	static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
	376	struct snd_ctl_elem_value_x32 __user *data32)
	377	{
	378	return ctl_elem_write_user(file, data32, &data32->value);
	379	}
	380	#endif /* CONFIG_X86_X32 */
	381
1da177e4	382	/* add or replace a user control */
82e9bae6 TI	383	static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
82e9bae6 TI	384	struct snd_ctl_elem_info32 __user *data32,
1da177e4 LT	385	int replace)
1da177e4 LT	386	{
82e9bae6	387	struct snd_ctl_elem_info *data;
1da177e4 LT	388	int err;
1da177e4 LT	389
ca2c0966	390	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	391	if (! data)
	392	return -ENOMEM;
	393
	394	err = -EFAULT;
	395	/* id, type, access, count */ \
	396	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) \|\|
	397	copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
	398	goto error;
ba6797c2	399	if (get_user(data->owner, &data32->owner))
1da177e4 LT	400	goto error;
	401	switch (data->type) {
	402	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	403	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	404	if (get_user(data->value.integer.min, &data32->value.integer.min) \|\|
	405	get_user(data->value.integer.max, &data32->value.integer.max) \|\|
	406	get_user(data->value.integer.step, &data32->value.integer.step))
	407	goto error;
	408	break;
	409	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	410	if (copy_from_user(&data->value.integer64,
	411	&data32->value.integer64,
	412	sizeof(data->value.integer64)))
	413	goto error;
	414	break;
	415	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	416	if (copy_from_user(&data->value.enumerated,
	417	&data32->value.enumerated,
	418	sizeof(data->value.enumerated)))
	419	goto error;
8d448162 CL	420	data->value.enumerated.names_ptr =
8d448162 CL	421	(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
1da177e4 LT	422	break;
	423	default:
	424	break;
	425	}
	426	err = snd_ctl_elem_add(file, data, replace);
	427	error:
	428	kfree(data);
	429	return err;
	430	}
	431
	432	enum {
82e9bae6 TI	433	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	434	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	435	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	436	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	437	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	438	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
6236d8bb TI	439	#ifdef CONFIG_X86_X32
	440	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	441	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
	442	#endif /* CONFIG_X86_X32 */
1da177e4 LT	443	};
	444
	445	static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	446	{
82e9bae6	447	struct snd_ctl_file *ctl;
9244b2c3	448	struct snd_kctl_ioctl *p;
1da177e4 LT	449	void __user *argp = compat_ptr(arg);
	450	int err;
	451
	452	ctl = file->private_data;
7eaa943c TI	453	if (snd_BUG_ON(!ctl \|\| !ctl->card))
7eaa943c TI	454	return -ENXIO;
1da177e4 LT	455
	456	switch (cmd) {
	457	case SNDRV_CTL_IOCTL_PVERSION:
	458	case SNDRV_CTL_IOCTL_CARD_INFO:
	459	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	460	case SNDRV_CTL_IOCTL_POWER:
	461	case SNDRV_CTL_IOCTL_POWER_STATE:
	462	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	463	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
2b1181ed TI	464	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	465	case SNDRV_CTL_IOCTL_TLV_READ:
	466	case SNDRV_CTL_IOCTL_TLV_WRITE:
	467	case SNDRV_CTL_IOCTL_TLV_COMMAND:
1da177e4 LT	468	return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	469	case SNDRV_CTL_IOCTL_ELEM_LIST32:
	470	return snd_ctl_elem_list_compat(ctl->card, argp);
	471	case SNDRV_CTL_IOCTL_ELEM_INFO32:
	472	return snd_ctl_elem_info_compat(ctl, argp);
	473	case SNDRV_CTL_IOCTL_ELEM_READ32:
	474	return snd_ctl_elem_read_user_compat(ctl->card, argp);
	475	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
	476	return snd_ctl_elem_write_user_compat(ctl, argp);
	477	case SNDRV_CTL_IOCTL_ELEM_ADD32:
	478	return snd_ctl_elem_add_compat(ctl, argp, 0);
	479	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
	480	return snd_ctl_elem_add_compat(ctl, argp, 1);
6236d8bb TI	481	#ifdef CONFIG_X86_X32
	482	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
	483	return snd_ctl_elem_read_user_x32(ctl->card, argp);
	484	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
	485	return snd_ctl_elem_write_user_x32(ctl, argp);
	486	#endif /* CONFIG_X86_X32 */
1da177e4 LT	487	}
	488
	489	down_read(&snd_ioctl_rwsem);
9244b2c3	490	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
1da177e4 LT	491	if (p->fioctl) {
	492	err = p->fioctl(ctl->card, ctl, cmd, arg);
	493	if (err != -ENOIOCTLCMD) {
	494	up_read(&snd_ioctl_rwsem);
	495	return err;
	496	}
	497	}
	498	}
	499	up_read(&snd_ioctl_rwsem);
	500	return -ENOIOCTLCMD;
	501	}