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linux/sound/core/control_compat.c
Johannes Berg 9244b2c307 [ALSA] alsa core: convert to list_for_each_entry* 
This patch converts most uses of list_for_each to list_for_each_entry all
across alsa. In some place apparently an item can be on a list with
different pointers so of course that isn't compatible with list_for_each, I
therefore didn't touch those places.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
2007-02-09 09:00:10 +01:00

442 lines
11 KiB
C
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/*
* 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;
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];
};
/* 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;
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(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;
struct snd_card *card = file->card;
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;
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(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 snd_kctl_ioctl *p;
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:
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);
}
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;
}
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