/*
* 32bit -> 64bit ioctl wrapper 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
*
*/
#include <sound/driver.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <sound/core.h>
#include <sound/control.h>
#include <asm/uaccess.h>
#include "ioctl32.h"
/*
* register/unregister mappers
* exported for other modules
*/
MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
MODULE_DESCRIPTION("ioctl32 wrapper for ALSA");
MODULE_LICENSE("GPL");
int register_ioctl32_conversion(unsigned int cmd, int (*handler)(unsigned int, unsigned int, unsigned long, struct file *));
int unregister_ioctl32_conversion(unsigned int cmd);
int snd_ioctl32_register(struct ioctl32_mapper *mappers)
{
int err;
struct ioctl32_mapper *m;
for (m = mappers; m->cmd; m++) {
err = register_ioctl32_conversion(m->cmd, m->handler);
if (err >= 0)
m->registered++;
}
return 0;
}
void snd_ioctl32_unregister(struct ioctl32_mapper *mappers)
{
struct ioctl32_mapper *m;
for (m = mappers; m->cmd; m++) {
if (m->registered) {
unregister_ioctl32_conversion(m->cmd);
m->registered = 0;
}
}
}
/*
* compatible wrapper
*/
int snd_ioctl32_compat(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *filp)
{
if (! filp->f_op || ! filp->f_op->ioctl)
return -ENOTTY;
return filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
}
/*
* Controls
*/
struct sndrv_ctl_elem_list32 {
u32 offset;
u32 space;
u32 used;
u32 count;
u32 pids;
unsigned char reserved[50];
} /* don't set packed attribute here */;
#define CVT_sndrv_ctl_elem_list()\
{\
COPY(offset);\
COPY(space);\
COPY(used);\
COPY(count);\
CPTR(pids);\
}
static inline int _snd_ioctl32_ctl_elem_list(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
struct sndrv_ctl_elem_list32 data32;
struct sndrv_ctl_elem_list data;
mm_segment_t oldseg;
int err;
if (copy_from_user(&data32, (void __user *)arg, sizeof(data32)))
return -EFAULT;
memset(&data, 0, sizeof(data));
data.offset = data32.offset;
data.space = data32.space;
data.used = data32.used;
data.count = data32.count;
data.pids = compat_ptr(data32.pids);
oldseg = get_fs();
set_fs(KERNEL_DS);
err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)&data);
set_fs(oldseg);
if (err < 0)
return err;
/* copy the result */
data32.offset = data.offset;
data32.space = data.space;
data32.used = data.used;
data32.count = data.count;
//data.pids = data.pids;
if (copy_to_user((void __user *)arg, &data32, sizeof(data32)))
return -EFAULT;
return 0;
}
DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_list, ctl_elem_list, SNDRV_CTL_IOCTL_ELEM_LIST);
/*
* control element info
* it uses union, so the things are not easy..
*/
struct sndrv_ctl_elem_info32 {
struct sndrv_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 inline int _snd_ioctl32_ctl_elem_info(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
struct sndrv_ctl_elem_info data;
struct sndrv_ctl_elem_info32 data32;
int err;
mm_segment_t oldseg;
if (copy_from_user(&data32, (void __user *)arg, sizeof(data32)))
return -EFAULT;
memset(&data, 0, sizeof(data));
data.id = data32.id;
/* we need to copy the item index.
* hope this doesn't break anything..
*/
data.value.enumerated.item = data32.value.enumerated.item;
oldseg = get_fs();
set_fs(KERNEL_DS);
err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)&data);
set_fs(oldseg);
if (err < 0)
return err;
/* restore info to 32bit */
data32.id = data.id;
data32.type = data.type;
data32.access = data.access;
data32.count = data.count;
data32.owner = data.owner;
switch (data.type) {
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
case SNDRV_CTL_ELEM_TYPE_INTEGER:
data32.value.integer.min = data.value.integer.min;
data32.value.integer.max = data.value.integer.max;
data32.value.integer.step = data.value.integer.step;
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
data32.value.integer64.min = data.value.integer64.min;
data32.value.integer64.max = data.value.integer64.max;
data32.value.integer64.step = data.value.integer64.step;
break;
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
data32.value.enumerated.items = data.value.enumerated.items;
data32.value.enumerated.item = data.value.enumerated.item;
memcpy(data32.value.enumerated.name, data.value.enumerated.name,
sizeof(data.value.enumerated.name));
break;
default:
break;
}
if (copy_to_user((void __user *)arg, &data32, sizeof(data32)))
return -EFAULT;
return 0;
}
DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_info, ctl_elem_info, SNDRV_CTL_IOCTL_ELEM_INFO);
struct sndrv_ctl_elem_value32 {
struct sndrv_ctl_elem_id id;
unsigned int indirect; /* bit-field causes misalignment */
union {
union {
s32 value[128];
u32 value_ptr;
} integer;
union {
s64 value[64];
u32 value_ptr;
} integer64;
union {
u32 item[128];
u32 item_ptr;
} enumerated;
union {
unsigned char data[512];
u32 data_ptr;
} bytes;
struct sndrv_aes_iec958 iec958;
} value;
unsigned char reserved[128];
};
/* hmm, it's so hard to retrieve the value type from the control id.. */
static int get_ctl_type(struct file *file, snd_ctl_elem_id_t *id)
{
snd_ctl_file_t *ctl;
snd_kcontrol_t *kctl;
snd_ctl_elem_info_t info;
int err;
ctl = file->private_data;
down_read(&ctl->card->controls_rwsem);
kctl = snd_ctl_find_id(ctl->card, id);
if (! kctl) {
up_read(&ctl->card->controls_rwsem);
return -ENXIO;
}
info.id = *id;
err = kctl->info(kctl, &info);
up_read(&ctl->card->controls_rwsem);
if (err >= 0)
err = info.type;
return err;
}
static inline int _snd_ioctl32_ctl_elem_value(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
struct sndrv_ctl_elem_value *data;
struct sndrv_ctl_elem_value32 *data32;
int err, i;
int type;
mm_segment_t oldseg;
/* FIXME: check the sane ioctl.. */
data = kmalloc(sizeof(*data), GFP_KERNEL);
data32 = kmalloc(sizeof(*data32), GFP_KERNEL);
if (data == NULL || data32 == NULL) {
err = -ENOMEM;
goto __end;
}
if (copy_from_user(data32, (void __user *)arg, sizeof(*data32))) {
err = -EFAULT;
goto __end;
}
memset(data, 0, sizeof(*data));
data->id = data32->id;
data->indirect = data32->indirect;
if (data->indirect) /* FIXME: this is not correct for long arrays */
data->value.integer.value_ptr = compat_ptr(data32->value.integer.value_ptr);
type = get_ctl_type(file, &data->id);
if (type < 0) {
err = type;
goto __end;
}
if (! data->indirect) {
switch (type) {
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
case SNDRV_CTL_ELEM_TYPE_INTEGER:
for (i = 0; i < 128; i++)
data->value.integer.value[i] = data32->value.integer.value[i];
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
for (i = 0; i < 64; i++)
data->value.integer64.value[i] = data32->value.integer64.value[i];
break;
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
for (i = 0; i < 128; i++)
data->value.enumerated.item[i] = data32->value.enumerated.item[i];
break;
case SNDRV_CTL_ELEM_TYPE_BYTES:
memcpy(data->value.bytes.data, data32->value.bytes.data,
sizeof(data->value.bytes.data));
break;
case SNDRV_CTL_ELEM_TYPE_IEC958:
data->value.iec958 = data32->value.iec958;
break;
default:
printk("unknown type %d\n", type);
break;
}
}
oldseg = get_fs();
set_fs(KERNEL_DS);
err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);
set_fs(oldseg);
if (err < 0)
goto __end;
/* restore info to 32bit */
if (! data->indirect) {
switch (type) {
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
case SNDRV_CTL_ELEM_TYPE_INTEGER:
for (i = 0; i < 128; i++)
data32->value.integer.value[i] = data->value.integer.value[i];
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
for (i = 0; i < 64; i++)
data32->value.integer64.value[i] = data->value.integer64.value[i];
break;
case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
for (i = 0; i < 128; i++)
data32->value.enumerated.item[i] = data->value.enumerated.item[i];
break;
case SNDRV_CTL_ELEM_TYPE_BYTES:
memcpy(data32->value.bytes.data, data->value.bytes.data,
sizeof(data->value.bytes.data));
break;
case SNDRV_CTL_ELEM_TYPE_IEC958:
data32->value.iec958 = data->value.iec958;
break;
default:
break;
}
}
err = 0;
if (copy_to_user((void __user *)arg, data32, sizeof(*data32)))
err = -EFAULT;
__end:
if (data32)
kfree(data32);
if (data)
kfree(data);
return err;
}
DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_read, ctl_elem_value, SNDRV_CTL_IOCTL_ELEM_READ);
DEFINE_ALSA_IOCTL_ENTRY(ctl_elem_write, ctl_elem_value, SNDRV_CTL_IOCTL_ELEM_WRITE);
/*
*/
#define AP(x) snd_ioctl32_##x
enum {
SNDRV_CTL_IOCTL_ELEM_LIST32 = _IOWR('U', 0x10, struct sndrv_ctl_elem_list32),
SNDRV_CTL_IOCTL_ELEM_INFO32 = _IOWR('U', 0x11, struct sndrv_ctl_elem_info32),
SNDRV_CTL_IOCTL_ELEM_READ32 = _IOWR('U', 0x12, struct sndrv_ctl_elem_value32),
SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct sndrv_ctl_elem_value32),
};
static struct ioctl32_mapper control_mappers[] = {
/* controls (without rawmidi, hwdep, timer releated ones) */
MAP_COMPAT(SNDRV_CTL_IOCTL_PVERSION),
MAP_COMPAT(SNDRV_CTL_IOCTL_CARD_INFO),
{ SNDRV_CTL_IOCTL_ELEM_LIST32, AP(ctl_elem_list) },
{ SNDRV_CTL_IOCTL_ELEM_INFO32, AP(ctl_elem_info) },
{ SNDRV_CTL_IOCTL_ELEM_READ32, AP(ctl_elem_read) },
{ SNDRV_CTL_IOCTL_ELEM_WRITE32, AP(ctl_elem_write) },
MAP_COMPAT(SNDRV_CTL_IOCTL_ELEM_LOCK),
MAP_COMPAT(SNDRV_CTL_IOCTL_ELEM_UNLOCK),
MAP_COMPAT(SNDRV_CTL_IOCTL_SUBSCRIBE_EVENTS),
MAP_COMPAT(SNDRV_CTL_IOCTL_HWDEP_INFO),
MAP_COMPAT(SNDRV_CTL_IOCTL_HWDEP_NEXT_DEVICE),
MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE),
MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_INFO),
MAP_COMPAT(SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE),
MAP_COMPAT(SNDRV_CTL_IOCTL_POWER),
MAP_COMPAT(SNDRV_CTL_IOCTL_POWER_STATE),
{ 0 }
};
/*
*/
extern struct ioctl32_mapper pcm_mappers[];
extern struct ioctl32_mapper rawmidi_mappers[];
extern struct ioctl32_mapper timer_mappers[];
extern struct ioctl32_mapper hwdep_mappers[];
#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
extern struct ioctl32_mapper seq_mappers[];
#endif
static void snd_ioctl32_done(void)
{
#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
snd_ioctl32_unregister(seq_mappers);
#endif
snd_ioctl32_unregister(hwdep_mappers);
snd_ioctl32_unregister(timer_mappers);
snd_ioctl32_unregister(rawmidi_mappers);
snd_ioctl32_unregister(pcm_mappers);
snd_ioctl32_unregister(control_mappers);
}
static int __init snd_ioctl32_init(void)
{
snd_ioctl32_register(control_mappers);
snd_ioctl32_register(pcm_mappers);
snd_ioctl32_register(rawmidi_mappers);
snd_ioctl32_register(timer_mappers);
snd_ioctl32_register(hwdep_mappers);
#if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
snd_ioctl32_register(seq_mappers);
#endif
return 0;
}
module_init(snd_ioctl32_init)
module_exit(snd_ioctl32_done)
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