[GitHub/mt8127/android_kernel_alcatel_ttab.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;

	snd_power_lock(ctl->card);
	err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
	if (err >= 0)
		err = snd_ctl_elem_info(ctl, data);
	snd_power_unlock(ctl->card);

	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 -ENXIO;
	}
	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) {
			printk(KERN_ERR "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;

	snd_power_lock(card);
	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
	if (err >= 0)
		err = snd_ctl_elem_read(card, data);
	snd_power_unlock(card);
	if (err >= 0)
		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;

	snd_power_lock(card);
	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
	if (err >= 0)
		err = snd_ctl_elem_write(card, file, data);
	snd_power_unlock(card);
	if (err >= 0)
		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) ||
	    get_user(data->type, &data32->type))
		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 GP	113
64649400 GP	114	snd_power_lock(ctl->card);
cbac4b0c	115	err = snd_power_wait(ctl->card, SNDRV_CTL_POWER_D0);
64649400 GP	116	if (err >= 0)
	117	err = snd_ctl_elem_info(ctl, data);
	118	snd_power_unlock(ctl->card);
	119
1da177e4 LT	120	if (err < 0)
	121	goto error;
	122	/* restore info to 32bit */
	123	err = -EFAULT;
	124	/* id, type, access, count */
	125	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) \|\|
	126	copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
	127	goto error;
	128	if (put_user(data->owner, &data32->owner))
	129	goto error;
	130	switch (data->type) {
	131	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	132	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	133	if (put_user(data->value.integer.min, &data32->value.integer.min) \|\|
	134	put_user(data->value.integer.max, &data32->value.integer.max) \|\|
	135	put_user(data->value.integer.step, &data32->value.integer.step))
	136	goto error;
	137	break;
	138	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	139	if (copy_to_user(&data32->value.integer64,
	140	&data->value.integer64,
	141	sizeof(data->value.integer64)))
	142	goto error;
	143	break;
	144	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	145	if (copy_to_user(&data32->value.enumerated,
	146	&data->value.enumerated,
	147	sizeof(data->value.enumerated)))
	148	goto error;
	149	break;
	150	default:
	151	break;
	152	}
	153	err = 0;
	154	error:
	155	kfree(data);
	156	return err;
	157	}
	158
	159	/* read / write */
82e9bae6 TI	160	struct snd_ctl_elem_value32 {
82e9bae6 TI	161	struct snd_ctl_elem_id id;
1da177e4 LT	162	unsigned int indirect; /* bit-field causes misalignment */
	163	union {
	164	s32 integer[128];
	165	unsigned char data[512];
	166	#ifndef CONFIG_X86_64
	167	s64 integer64[64];
	168	#endif
	169	} value;
	170	unsigned char reserved[128];
	171	};
	172
6146f38b TI	173	#ifdef CONFIG_X86_X32
	174	/* x32 has a different alignment for 64bit values from ia32 */
	175	struct snd_ctl_elem_value_x32 {
	176	struct snd_ctl_elem_id id;
	177	unsigned int indirect; /* bit-field causes misalignment */
	178	union {
	179	s32 integer[128];
	180	unsigned char data[512];
	181	s64 integer64[64];
	182	} value;
	183	unsigned char reserved[128];
	184	};
	185	#endif /* CONFIG_X86_X32 */
1da177e4 LT	186
1da177e4 LT	187	/* get the value type and count of the control */
82e9bae6 TI	188	static int get_ctl_type(struct snd_card card, struct snd_ctl_elem_id id,
82e9bae6 TI	189	int *countp)
1da177e4	190	{
82e9bae6	191	struct snd_kcontrol *kctl;
aa657ca9	192	struct snd_ctl_elem_info *info;
1da177e4 LT	193	int err;
	194
	195	down_read(&card->controls_rwsem);
	196	kctl = snd_ctl_find_id(card, id);
	197	if (! kctl) {
	198	up_read(&card->controls_rwsem);
	199	return -ENXIO;
	200	}
aa657ca9 JK	201	info = kzalloc(sizeof(*info), GFP_KERNEL);
	202	if (info == NULL) {
	203	up_read(&card->controls_rwsem);
	204	return -ENOMEM;
	205	}
	206	info->id = *id;
	207	err = kctl->info(kctl, info);
1da177e4 LT	208	up_read(&card->controls_rwsem);
1da177e4 LT	209	if (err >= 0) {
aa657ca9 JK	210	err = info->type;
aa657ca9 JK	211	*countp = info->count;
1da177e4	212	}
aa657ca9	213	kfree(info);
1da177e4 LT	214	return err;
	215	}
	216
	217	static int get_elem_size(int type, int count)
	218	{
	219	switch (type) {
	220	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	221	return sizeof(s64) * count;
	222	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	223	return sizeof(int) * count;
	224	case SNDRV_CTL_ELEM_TYPE_BYTES:
	225	return 512;
	226	case SNDRV_CTL_ELEM_TYPE_IEC958:
82e9bae6	227	return sizeof(struct snd_aes_iec958);
1da177e4 LT	228	default:
	229	return -1;
	230	}
	231	}
	232
82e9bae6 TI	233	static int copy_ctl_value_from_user(struct snd_card *card,
82e9bae6 TI	234	struct snd_ctl_elem_value *data,
6146f38b TI	235	void __user *userdata,
6146f38b TI	236	void __user *valuep,
1da177e4 LT	237	int typep, int countp)
1da177e4 LT	238	{
6146f38b	239	struct snd_ctl_elem_value32 __user *data32 = userdata;
5050b092 AM	240	int i, type, size;
5050b092 AM	241	int uninitialized_var(count);
1da177e4 LT	242	unsigned int indirect;
	243
	244	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	245	return -EFAULT;
	246	if (get_user(indirect, &data32->indirect))
	247	return -EFAULT;
	248	if (indirect)
	249	return -EINVAL;
	250	type = get_ctl_type(card, &data->id, &count);
	251	if (type < 0)
	252	return type;
	253
	254	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	255	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	256	for (i = 0; i < count; i++) {
6146f38b	257	s32 __user *intp = valuep;
1da177e4	258	int val;
6146f38b	259	if (get_user(val, &intp[i]))
1da177e4 LT	260	return -EFAULT;
	261	data->value.integer.value[i] = val;
	262	}
	263	} else {
	264	size = get_elem_size(type, count);
	265	if (size < 0) {
	266	printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
	267	return -EINVAL;
	268	}
6146f38b	269	if (copy_from_user(data->value.bytes.data, valuep, size))
1da177e4 LT	270	return -EFAULT;
	271	}
	272
	273	*typep = type;
	274	*countp = count;
	275	return 0;
	276	}
	277
	278	/* restore the value to 32bit */
6146f38b TI	279	static int copy_ctl_value_to_user(void __user *userdata,
6146f38b TI	280	void __user *valuep,
82e9bae6	281	struct snd_ctl_elem_value *data,
1da177e4 LT	282	int type, int count)
	283	{
	284	int i, size;
	285
	286	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	287	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	288	for (i = 0; i < count; i++) {
6146f38b	289	s32 __user *intp = valuep;
1da177e4 LT	290	int val;
1da177e4 LT	291	val = data->value.integer.value[i];
6146f38b	292	if (put_user(val, &intp[i]))
1da177e4 LT	293	return -EFAULT;
	294	}
	295	} else {
	296	size = get_elem_size(type, count);
6146f38b	297	if (copy_to_user(valuep, data->value.bytes.data, size))
1da177e4 LT	298	return -EFAULT;
	299	}
	300	return 0;
	301	}
	302
6146f38b TI	303	static int ctl_elem_read_user(struct snd_card *card,
6146f38b TI	304	void __user userdata, void __user valuep)
1da177e4	305	{
82e9bae6	306	struct snd_ctl_elem_value *data;
1da177e4 LT	307	int err, type, count;
1da177e4 LT	308
ca2c0966	309	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	310	if (data == NULL)
	311	return -ENOMEM;
	312
6146f38b TI	313	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	314	&type, &count);
	315	if (err < 0)
1da177e4	316	goto error;
64649400 GP	317
64649400 GP	318	snd_power_lock(card);
cbac4b0c	319	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
64649400 GP	320	if (err >= 0)
	321	err = snd_ctl_elem_read(card, data);
	322	snd_power_unlock(card);
	323	if (err >= 0)
6146f38b TI	324	err = copy_ctl_value_to_user(userdata, valuep, data,
6146f38b TI	325	type, count);
1da177e4 LT	326	error:
	327	kfree(data);
	328	return err;
	329	}
	330
6146f38b TI	331	static int ctl_elem_write_user(struct snd_ctl_file *file,
6146f38b TI	332	void __user userdata, void __user valuep)
1da177e4	333	{
82e9bae6	334	struct snd_ctl_elem_value *data;
64649400	335	struct snd_card *card = file->card;
1da177e4 LT	336	int err, type, count;
1da177e4 LT	337
ca2c0966	338	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	339	if (data == NULL)
	340	return -ENOMEM;
	341
6146f38b TI	342	err = copy_ctl_value_from_user(card, data, userdata, valuep,
	343	&type, &count);
	344	if (err < 0)
1da177e4	345	goto error;
64649400 GP	346
64649400 GP	347	snd_power_lock(card);
cbac4b0c	348	err = snd_power_wait(card, SNDRV_CTL_POWER_D0);
64649400 GP	349	if (err >= 0)
	350	err = snd_ctl_elem_write(card, file, data);
	351	snd_power_unlock(card);
	352	if (err >= 0)
6146f38b TI	353	err = copy_ctl_value_to_user(userdata, valuep, data,
6146f38b TI	354	type, count);
1da177e4 LT	355	error:
	356	kfree(data);
	357	return err;
	358	}
	359
6146f38b TI	360	static int snd_ctl_elem_read_user_compat(struct snd_card *card,
	361	struct snd_ctl_elem_value32 __user *data32)
	362	{
	363	return ctl_elem_read_user(card, data32, &data32->value);
	364	}
	365
	366	static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
	367	struct snd_ctl_elem_value32 __user *data32)
	368	{
	369	return ctl_elem_write_user(file, data32, &data32->value);
	370	}
	371
	372	#ifdef CONFIG_X86_X32
	373	static int snd_ctl_elem_read_user_x32(struct snd_card *card,
	374	struct snd_ctl_elem_value_x32 __user *data32)
	375	{
	376	return ctl_elem_read_user(card, data32, &data32->value);
	377	}
	378
	379	static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
	380	struct snd_ctl_elem_value_x32 __user *data32)
	381	{
	382	return ctl_elem_write_user(file, data32, &data32->value);
	383	}
	384	#endif /* CONFIG_X86_X32 */
	385
1da177e4	386	/* add or replace a user control */
82e9bae6 TI	387	static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
82e9bae6 TI	388	struct snd_ctl_elem_info32 __user *data32,
1da177e4 LT	389	int replace)
1da177e4 LT	390	{
82e9bae6	391	struct snd_ctl_elem_info *data;
1da177e4 LT	392	int err;
1da177e4 LT	393
ca2c0966	394	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	395	if (! data)
	396	return -ENOMEM;
	397
	398	err = -EFAULT;
	399	/* id, type, access, count */ \
	400	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) \|\|
	401	copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
	402	goto error;
	403	if (get_user(data->owner, &data32->owner) \|\|
	404	get_user(data->type, &data32->type))
	405	goto error;
	406	switch (data->type) {
	407	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	408	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	409	if (get_user(data->value.integer.min, &data32->value.integer.min) \|\|
	410	get_user(data->value.integer.max, &data32->value.integer.max) \|\|
	411	get_user(data->value.integer.step, &data32->value.integer.step))
	412	goto error;
	413	break;
	414	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	415	if (copy_from_user(&data->value.integer64,
	416	&data32->value.integer64,
	417	sizeof(data->value.integer64)))
	418	goto error;
	419	break;
	420	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	421	if (copy_from_user(&data->value.enumerated,
	422	&data32->value.enumerated,
	423	sizeof(data->value.enumerated)))
	424	goto error;
8d448162 CL	425	data->value.enumerated.names_ptr =
8d448162 CL	426	(uintptr_t)compat_ptr(data->value.enumerated.names_ptr);
1da177e4 LT	427	break;
	428	default:
	429	break;
	430	}
	431	err = snd_ctl_elem_add(file, data, replace);
	432	error:
	433	kfree(data);
	434	return err;
	435	}
	436
	437	enum {
82e9bae6 TI	438	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	439	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	440	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	441	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	442	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	443	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
6146f38b TI	444	#ifdef CONFIG_X86_X32
	445	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
	446	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
	447	#endif /* CONFIG_X86_X32 */
1da177e4 LT	448	};
	449
	450	static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	451	{
82e9bae6	452	struct snd_ctl_file *ctl;
9244b2c3	453	struct snd_kctl_ioctl *p;
1da177e4 LT	454	void __user *argp = compat_ptr(arg);
	455	int err;
	456
	457	ctl = file->private_data;
7eaa943c TI	458	if (snd_BUG_ON(!ctl \|\| !ctl->card))
7eaa943c TI	459	return -ENXIO;
1da177e4 LT	460
	461	switch (cmd) {
	462	case SNDRV_CTL_IOCTL_PVERSION:
	463	case SNDRV_CTL_IOCTL_CARD_INFO:
	464	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	465	case SNDRV_CTL_IOCTL_POWER:
	466	case SNDRV_CTL_IOCTL_POWER_STATE:
	467	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	468	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
2b1181ed TI	469	case SNDRV_CTL_IOCTL_ELEM_REMOVE:
	470	case SNDRV_CTL_IOCTL_TLV_READ:
	471	case SNDRV_CTL_IOCTL_TLV_WRITE:
	472	case SNDRV_CTL_IOCTL_TLV_COMMAND:
1da177e4 LT	473	return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	474	case SNDRV_CTL_IOCTL_ELEM_LIST32:
	475	return snd_ctl_elem_list_compat(ctl->card, argp);
	476	case SNDRV_CTL_IOCTL_ELEM_INFO32:
	477	return snd_ctl_elem_info_compat(ctl, argp);
	478	case SNDRV_CTL_IOCTL_ELEM_READ32:
	479	return snd_ctl_elem_read_user_compat(ctl->card, argp);
	480	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
	481	return snd_ctl_elem_write_user_compat(ctl, argp);
	482	case SNDRV_CTL_IOCTL_ELEM_ADD32:
	483	return snd_ctl_elem_add_compat(ctl, argp, 0);
	484	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
	485	return snd_ctl_elem_add_compat(ctl, argp, 1);
6146f38b TI	486	#ifdef CONFIG_X86_X32
	487	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
	488	return snd_ctl_elem_read_user_x32(ctl->card, argp);
	489	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
	490	return snd_ctl_elem_write_user_x32(ctl, argp);
	491	#endif /* CONFIG_X86_X32 */
1da177e4 LT	492	}
	493
	494	down_read(&snd_ioctl_rwsem);
9244b2c3	495	list_for_each_entry(p, &snd_control_compat_ioctls, list) {
1da177e4 LT	496	if (p->fioctl) {
	497	err = p->fioctl(ctl->card, ctl, cmd, arg);
	498	if (err != -ENOIOCTLCMD) {
	499	up_read(&snd_ioctl_rwsem);
	500	return err;
	501	}
	502	}
	503	}
	504	up_read(&snd_ioctl_rwsem);
	505	return -ENOIOCTLCMD;
	506	}