[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>

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];
		} 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_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];
};


/* 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,
				    struct snd_ctl_elem_value32 __user *data32,
				    int *typep, int *countp)
{
	int i, type, count, size;
	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++) {
			int val;
			if (get_user(val, &data32->value.integer[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,
				   data32->value.data, size))
			return -EFAULT;
	}

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

/* restore the value to 32bit */
static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
				  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++) {
			int val;
			val = data->value.integer.value[i];
			if (put_user(val, &data32->value.integer[i]))
				return -EFAULT;
		}
	} else {
		size = get_elem_size(type, count);
		if (copy_to_user(data32->value.data,
				 data->value.bytes.data, size))
			return -EFAULT;
	}
	return 0;
}

static int snd_ctl_elem_read_user_compat(struct snd_card *card, 
					 struct snd_ctl_elem_value32 __user *data32)
{
	struct snd_ctl_elem_value *data;
	int err, type, count;

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

	if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
		goto error;
	if ((err = snd_ctl_elem_read(card, data)) < 0)
		goto error;
	err = copy_ctl_value_to_user(data32, data, type, count);
 error:
	kfree(data);
	return err;
}

static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
					  struct snd_ctl_elem_value32 __user *data32)
{
	struct snd_ctl_elem_value *data;
	int err, type, count;

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

	if ((err = copy_ctl_value_from_user(file->card, data, data32, &type, &count)) < 0)
		goto error;
	if ((err = snd_ctl_elem_write(file->card, file, data)) < 0)
		goto error;
	err = copy_ctl_value_to_user(data32, data, type, count);
 error:
	kfree(data);
	return err;
}

/* 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;
		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),
};

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

	ctl = file->private_data;
	snd_assert(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:
		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);
	}

	down_read(&snd_ioctl_rwsem);
	list_for_each(list, &snd_control_compat_ioctls) {
		struct snd_kctl_ioctl *p = list_entry(list, struct snd_kctl_ioctl, 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>
	24
82e9bae6	25	struct snd_ctl_elem_list32 {
1da177e4 LT	26	u32 offset;
	27	u32 space;
	28	u32 used;
	29	u32 count;
	30	u32 pids;
	31	unsigned char reserved[50];
	32	} /* don't set packed attribute here */;
	33
82e9bae6 TI	34	static int snd_ctl_elem_list_compat(struct snd_card *card,
82e9bae6 TI	35	struct snd_ctl_elem_list32 __user *data32)
1da177e4	36	{
82e9bae6	37	struct snd_ctl_elem_list __user *data;
1da177e4 LT	38	compat_caddr_t ptr;
	39	int err;
	40
	41	data = compat_alloc_user_space(sizeof(*data));
	42
	43	/* offset, space, used, count */
	44	if (copy_in_user(data, data32, 4 * sizeof(u32)))
	45	return -EFAULT;
	46	/* pids */
	47	if (get_user(ptr, &data32->pids) \|\|
	48	put_user(compat_ptr(ptr), &data->pids))
	49	return -EFAULT;
	50	err = snd_ctl_elem_list(card, data);
	51	if (err < 0)
	52	return err;
	53	/* copy the result */
	54	if (copy_in_user(data32, data, 4 * sizeof(u32)))
	55	return -EFAULT;
	56	return 0;
	57	}
	58
	59	/*
	60	* control element info
	61	* it uses union, so the things are not easy..
	62	*/
	63
82e9bae6 TI	64	struct snd_ctl_elem_info32 {
82e9bae6 TI	65	struct snd_ctl_elem_id id; // the size of struct is same
1da177e4 LT	66	s32 type;
	67	u32 access;
	68	u32 count;
	69	s32 owner;
	70	union {
	71	struct {
	72	s32 min;
	73	s32 max;
	74	s32 step;
	75	} integer;
	76	struct {
	77	u64 min;
	78	u64 max;
	79	u64 step;
	80	} integer64;
	81	struct {
	82	u32 items;
	83	u32 item;
	84	char name[64];
	85	} enumerated;
	86	unsigned char reserved[128];
	87	} value;
	88	unsigned char reserved[64];
	89	} __attribute__((packed));
	90
82e9bae6 TI	91	static int snd_ctl_elem_info_compat(struct snd_ctl_file *ctl,
82e9bae6 TI	92	struct snd_ctl_elem_info32 __user *data32)
1da177e4	93	{
82e9bae6	94	struct snd_ctl_elem_info *data;
1da177e4 LT	95	int err;
1da177e4 LT	96
ca2c0966	97	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	98	if (! data)
	99	return -ENOMEM;
	100
	101	err = -EFAULT;
	102	/* copy id */
	103	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	104	goto error;
	105	/* we need to copy the item index.
	106	* hope this doesn't break anything..
	107	*/
	108	if (get_user(data->value.enumerated.item, &data32->value.enumerated.item))
	109	goto error;
	110	err = snd_ctl_elem_info(ctl, data);
	111	if (err < 0)
	112	goto error;
	113	/* restore info to 32bit */
	114	err = -EFAULT;
	115	/* id, type, access, count */
	116	if (copy_to_user(&data32->id, &data->id, sizeof(data->id)) \|\|
	117	copy_to_user(&data32->type, &data->type, 3 * sizeof(u32)))
	118	goto error;
	119	if (put_user(data->owner, &data32->owner))
	120	goto error;
	121	switch (data->type) {
	122	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	123	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	124	if (put_user(data->value.integer.min, &data32->value.integer.min) \|\|
	125	put_user(data->value.integer.max, &data32->value.integer.max) \|\|
	126	put_user(data->value.integer.step, &data32->value.integer.step))
	127	goto error;
	128	break;
	129	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	130	if (copy_to_user(&data32->value.integer64,
	131	&data->value.integer64,
	132	sizeof(data->value.integer64)))
	133	goto error;
	134	break;
	135	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	136	if (copy_to_user(&data32->value.enumerated,
	137	&data->value.enumerated,
	138	sizeof(data->value.enumerated)))
	139	goto error;
	140	break;
	141	default:
	142	break;
	143	}
	144	err = 0;
	145	error:
	146	kfree(data);
	147	return err;
	148	}
	149
	150	/* read / write */
82e9bae6 TI	151	struct snd_ctl_elem_value32 {
82e9bae6 TI	152	struct snd_ctl_elem_id id;
1da177e4 LT	153	unsigned int indirect; /* bit-field causes misalignment */
	154	union {
	155	s32 integer[128];
	156	unsigned char data[512];
	157	#ifndef CONFIG_X86_64
	158	s64 integer64[64];
	159	#endif
	160	} value;
	161	unsigned char reserved[128];
	162	};
	163
	164
	165	/* get the value type and count of the control */
82e9bae6 TI	166	static int get_ctl_type(struct snd_card card, struct snd_ctl_elem_id id,
82e9bae6 TI	167	int *countp)
1da177e4	168	{
82e9bae6	169	struct snd_kcontrol *kctl;
aa657ca9	170	struct snd_ctl_elem_info *info;
1da177e4 LT	171	int err;
	172
	173	down_read(&card->controls_rwsem);
	174	kctl = snd_ctl_find_id(card, id);
	175	if (! kctl) {
	176	up_read(&card->controls_rwsem);
	177	return -ENXIO;
	178	}
aa657ca9 JK	179	info = kzalloc(sizeof(*info), GFP_KERNEL);
	180	if (info == NULL) {
	181	up_read(&card->controls_rwsem);
	182	return -ENOMEM;
	183	}
	184	info->id = *id;
	185	err = kctl->info(kctl, info);
1da177e4 LT	186	up_read(&card->controls_rwsem);
1da177e4 LT	187	if (err >= 0) {
aa657ca9 JK	188	err = info->type;
aa657ca9 JK	189	*countp = info->count;
1da177e4	190	}
aa657ca9	191	kfree(info);
1da177e4 LT	192	return err;
	193	}
	194
	195	static int get_elem_size(int type, int count)
	196	{
	197	switch (type) {
	198	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	199	return sizeof(s64) * count;
	200	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	201	return sizeof(int) * count;
	202	case SNDRV_CTL_ELEM_TYPE_BYTES:
	203	return 512;
	204	case SNDRV_CTL_ELEM_TYPE_IEC958:
82e9bae6	205	return sizeof(struct snd_aes_iec958);
1da177e4 LT	206	default:
	207	return -1;
	208	}
	209	}
	210
82e9bae6 TI	211	static int copy_ctl_value_from_user(struct snd_card *card,
	212	struct snd_ctl_elem_value *data,
	213	struct snd_ctl_elem_value32 __user *data32,
1da177e4 LT	214	int typep, int countp)
	215	{
	216	int i, type, count, size;
	217	unsigned int indirect;
	218
	219	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)))
	220	return -EFAULT;
	221	if (get_user(indirect, &data32->indirect))
	222	return -EFAULT;
	223	if (indirect)
	224	return -EINVAL;
	225	type = get_ctl_type(card, &data->id, &count);
	226	if (type < 0)
	227	return type;
	228
	229	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	230	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	231	for (i = 0; i < count; i++) {
	232	int val;
	233	if (get_user(val, &data32->value.integer[i]))
	234	return -EFAULT;
	235	data->value.integer.value[i] = val;
	236	}
	237	} else {
	238	size = get_elem_size(type, count);
	239	if (size < 0) {
	240	printk(KERN_ERR "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
	241	return -EINVAL;
	242	}
	243	if (copy_from_user(data->value.bytes.data,
	244	data32->value.data, size))
	245	return -EFAULT;
	246	}
	247
	248	*typep = type;
	249	*countp = count;
	250	return 0;
	251	}
	252
	253	/* restore the value to 32bit */
82e9bae6 TI	254	static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
82e9bae6 TI	255	struct snd_ctl_elem_value *data,
1da177e4 LT	256	int type, int count)
	257	{
	258	int i, size;
	259
	260	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN \|\|
	261	type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
	262	for (i = 0; i < count; i++) {
	263	int val;
	264	val = data->value.integer.value[i];
	265	if (put_user(val, &data32->value.integer[i]))
	266	return -EFAULT;
	267	}
	268	} else {
	269	size = get_elem_size(type, count);
	270	if (copy_to_user(data32->value.data,
	271	data->value.bytes.data, size))
	272	return -EFAULT;
	273	}
	274	return 0;
	275	}
	276
82e9bae6 TI	277	static int snd_ctl_elem_read_user_compat(struct snd_card *card,
82e9bae6 TI	278	struct snd_ctl_elem_value32 __user *data32)
1da177e4	279	{
82e9bae6	280	struct snd_ctl_elem_value *data;
1da177e4 LT	281	int err, type, count;
1da177e4 LT	282
ca2c0966	283	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	284	if (data == NULL)
	285	return -ENOMEM;
	286
	287	if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
	288	goto error;
	289	if ((err = snd_ctl_elem_read(card, data)) < 0)
	290	goto error;
	291	err = copy_ctl_value_to_user(data32, data, type, count);
	292	error:
	293	kfree(data);
	294	return err;
	295	}
	296
82e9bae6 TI	297	static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
82e9bae6 TI	298	struct snd_ctl_elem_value32 __user *data32)
1da177e4	299	{
82e9bae6	300	struct snd_ctl_elem_value *data;
1da177e4 LT	301	int err, type, count;
1da177e4 LT	302
ca2c0966	303	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	304	if (data == NULL)
	305	return -ENOMEM;
	306
	307	if ((err = copy_ctl_value_from_user(file->card, data, data32, &type, &count)) < 0)
	308	goto error;
	309	if ((err = snd_ctl_elem_write(file->card, file, data)) < 0)
	310	goto error;
	311	err = copy_ctl_value_to_user(data32, data, type, count);
	312	error:
	313	kfree(data);
	314	return err;
	315	}
	316
	317	/* add or replace a user control */
82e9bae6 TI	318	static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
82e9bae6 TI	319	struct snd_ctl_elem_info32 __user *data32,
1da177e4 LT	320	int replace)
1da177e4 LT	321	{
82e9bae6	322	struct snd_ctl_elem_info *data;
1da177e4 LT	323	int err;
1da177e4 LT	324
ca2c0966	325	data = kzalloc(sizeof(*data), GFP_KERNEL);
1da177e4 LT	326	if (! data)
	327	return -ENOMEM;
	328
	329	err = -EFAULT;
	330	/* id, type, access, count */ \
	331	if (copy_from_user(&data->id, &data32->id, sizeof(data->id)) \|\|
	332	copy_from_user(&data->type, &data32->type, 3 * sizeof(u32)))
	333	goto error;
	334	if (get_user(data->owner, &data32->owner) \|\|
	335	get_user(data->type, &data32->type))
	336	goto error;
	337	switch (data->type) {
	338	case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
	339	case SNDRV_CTL_ELEM_TYPE_INTEGER:
	340	if (get_user(data->value.integer.min, &data32->value.integer.min) \|\|
	341	get_user(data->value.integer.max, &data32->value.integer.max) \|\|
	342	get_user(data->value.integer.step, &data32->value.integer.step))
	343	goto error;
	344	break;
	345	case SNDRV_CTL_ELEM_TYPE_INTEGER64:
	346	if (copy_from_user(&data->value.integer64,
	347	&data32->value.integer64,
	348	sizeof(data->value.integer64)))
	349	goto error;
	350	break;
	351	case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
	352	if (copy_from_user(&data->value.enumerated,
	353	&data32->value.enumerated,
	354	sizeof(data->value.enumerated)))
	355	goto error;
	356	break;
	357	default:
	358	break;
	359	}
	360	err = snd_ctl_elem_add(file, data, replace);
	361	error:
	362	kfree(data);
	363	return err;
	364	}
	365
	366	enum {
82e9bae6 TI	367	SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct snd_ctl_elem_list32),
	368	SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct snd_ctl_elem_info32),
	369	SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct snd_ctl_elem_value32),
	370	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
	371	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
	372	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
1da177e4 LT	373	};
	374
	375	static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
	376	{
82e9bae6	377	struct snd_ctl_file *ctl;
1da177e4 LT	378	struct list_head *list;
	379	void __user *argp = compat_ptr(arg);
	380	int err;
	381
	382	ctl = file->private_data;
	383	snd_assert(ctl && ctl->card, return -ENXIO);
	384
	385	switch (cmd) {
	386	case SNDRV_CTL_IOCTL_PVERSION:
	387	case SNDRV_CTL_IOCTL_CARD_INFO:
	388	case SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS:
	389	case SNDRV_CTL_IOCTL_POWER:
	390	case SNDRV_CTL_IOCTL_POWER_STATE:
	391	case SNDRV_CTL_IOCTL_ELEM_LOCK:
	392	case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
	393	return snd_ctl_ioctl(file, cmd, (unsigned long)argp);
	394	case SNDRV_CTL_IOCTL_ELEM_LIST32:
	395	return snd_ctl_elem_list_compat(ctl->card, argp);
	396	case SNDRV_CTL_IOCTL_ELEM_INFO32:
	397	return snd_ctl_elem_info_compat(ctl, argp);
	398	case SNDRV_CTL_IOCTL_ELEM_READ32:
	399	return snd_ctl_elem_read_user_compat(ctl->card, argp);
	400	case SNDRV_CTL_IOCTL_ELEM_WRITE32:
	401	return snd_ctl_elem_write_user_compat(ctl, argp);
	402	case SNDRV_CTL_IOCTL_ELEM_ADD32:
	403	return snd_ctl_elem_add_compat(ctl, argp, 0);
	404	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
	405	return snd_ctl_elem_add_compat(ctl, argp, 1);
	406	}
	407
	408	down_read(&snd_ioctl_rwsem);
	409	list_for_each(list, &snd_control_compat_ioctls) {
82e9bae6	410	struct snd_kctl_ioctl *p = list_entry(list, struct snd_kctl_ioctl, list);
1da177e4 LT	411	if (p->fioctl) {
	412	err = p->fioctl(ctl->card, ctl, cmd, arg);
	413	if (err != -ENOIOCTLCMD) {
	414	up_read(&snd_ioctl_rwsem);
	415	return err;
	416	}
	417	}
	418	}
	419	up_read(&snd_ioctl_rwsem);
	420	return -ENOIOCTLCMD;
	421	}