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Subject[PATCH 1/3] Conversion to compat_ioctl for ALSA drivers
This patch modifies Kconfig and Makefile to remove snd-ioctl32.
It convers to unlocked_ioctl, and adds the compat_ioctl entries.
New register/unregister functions for compat ioctl are added.

Signed-off-by: Takashi Iwai <tiwai@suse.de>


--- linux/sound/core/Kconfig 23 Nov 2004 14:49:03 -0000 1.7
+++ linux/sound/core/Kconfig 12 Jan 2005 22:49:21 -0000
@@ -81,20 +81,6 @@
To compile this driver as a module, choose M here: the module
will be called snd-seq-oss.

-config SND_BIT32_EMUL
- tristate "Emulation for 32-bit applications"
- depends on SND && COMPAT
- select SND_PCM
- select SND_RAWMIDI
- select SND_TIMER
- select SND_HWDEP
- help
- Say Y here to enable the emulation for 32-bit ALSA-native
- applications.
-
- To compile this driver as a module, choose M here: the module
- will be called snd-ioctl32.
-
config SND_RTCTIMER
tristate "RTC Timer support"
depends on SND && RTC
--- linux/sound/core/Makefile 3 Mar 2004 10:46:16 -0000 1.49
+++ linux/sound/core/Makefile 12 Jan 2005 22:49:21 -0000
@@ -31,4 +31,3 @@

obj-$(CONFIG_SND_OSSEMUL) += oss/
obj-$(CONFIG_SND_SEQUENCER) += seq/
-obj-$(CONFIG_SND_BIT32_EMUL) += ioctl32/
--- linux/sound/core/control.c 3 Jan 2005 14:27:52 -0000 1.49
+++ linux/sound/core/control.c 18 Jan 2005 14:52:43 -0000
@@ -43,6 +43,9 @@

static DECLARE_RWSEM(snd_ioctl_rwsem);
static LIST_HEAD(snd_control_ioctls);
+#ifdef CONFIG_COMPAT
+static LIST_HEAD(snd_control_compat_ioctls);
+#endif

static int snd_ctl_open(struct inode *inode, struct file *file)
{
@@ -595,43 +598,51 @@
return 0;
}

-static int snd_ctl_elem_info(snd_ctl_file_t *ctl, snd_ctl_elem_info_t __user *_info)
+static int snd_ctl_elem_info(snd_ctl_file_t *ctl, snd_ctl_elem_info_t *info)
{
snd_card_t *card = ctl->card;
- snd_ctl_elem_info_t info;
snd_kcontrol_t *kctl;
snd_kcontrol_volatile_t *vd;
unsigned int index_offset;
int result;

- if (copy_from_user(&info, _info, sizeof(info)))
- return -EFAULT;
down_read(&card->controls_rwsem);
- kctl = snd_ctl_find_id(card, &info.id);
+ kctl = snd_ctl_find_id(card, &info->id);
if (kctl == NULL) {
up_read(&card->controls_rwsem);
return -ENOENT;
}
#ifdef CONFIG_SND_DEBUG
- info.access = 0;
+ info->access = 0;
#endif
- result = kctl->info(kctl, &info);
+ result = kctl->info(kctl, info);
if (result >= 0) {
- snd_assert(info.access == 0, );
- index_offset = snd_ctl_get_ioff(kctl, &info.id);
+ snd_assert(info->access == 0, );
+ index_offset = snd_ctl_get_ioff(kctl, &info->id);
vd = &kctl->vd[index_offset];
- snd_ctl_build_ioff(&info.id, kctl, index_offset);
- info.access = vd->access;
+ snd_ctl_build_ioff(&info->id, kctl, index_offset);
+ info->access = vd->access;
if (vd->owner) {
- info.access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
+ info->access |= SNDRV_CTL_ELEM_ACCESS_LOCK;
if (vd->owner == ctl)
- info.access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
- info.owner = vd->owner_pid;
+ info->access |= SNDRV_CTL_ELEM_ACCESS_OWNER;
+ info->owner = vd->owner_pid;
} else {
- info.owner = -1;
+ info->owner = -1;
}
}
up_read(&card->controls_rwsem);
+ return result;
+}
+
+static int snd_ctl_elem_info_user(snd_ctl_file_t *ctl, snd_ctl_elem_info_t __user *_info)
+{
+ snd_ctl_elem_info_t info;
+ int result;
+
+ if (copy_from_user(&info, _info, sizeof(info)))
+ return -EFAULT;
+ result = snd_ctl_elem_info(ctl, &info);
if (result >= 0)
if (copy_to_user(_info, &info, sizeof(info)))
return -EFAULT;
@@ -816,14 +827,6 @@
struct user_element *ue = kcontrol->private_data;

*uinfo = ue->info;
- if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
- uinfo->value.enumerated.items = ue->info.value.enumerated.items;
- if (uinfo->value.enumerated.item >= ue->info.value.enumerated.items)
- uinfo->value.enumerated.item = 0;
- strlcpy(uinfo->value.enumerated.name,
- (char *)ue->priv_data + uinfo->value.enumerated.item * 64,
- 64);
- }
return 0;
}

@@ -851,28 +854,25 @@
kfree(kcontrol->private_data);
}

-static int snd_ctl_elem_add(snd_ctl_file_t *file, snd_ctl_elem_info_t __user *_info, int replace)
+static int snd_ctl_elem_add(snd_ctl_file_t *file, snd_ctl_elem_info_t *info, int replace)
{
snd_card_t *card = file->card;
- snd_ctl_elem_info_t info;
snd_kcontrol_t kctl, *_kctl;
unsigned int access;
- long private_size, extra_size;
+ long private_size;
struct user_element *ue;
int idx, err;

if (card->user_ctl_count >= MAX_USER_CONTROLS)
return -ENOMEM;
- if (copy_from_user(&info, _info, sizeof(info)))
- return -EFAULT;
- if (info.count > 1024)
+ if (info->count > 1024)
return -EINVAL;
- access = info.access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
- (info.access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE));
- info.id.numid = 0;
+ access = info->access == 0 ? SNDRV_CTL_ELEM_ACCESS_READWRITE :
+ (info->access & (SNDRV_CTL_ELEM_ACCESS_READWRITE|SNDRV_CTL_ELEM_ACCESS_INACTIVE));
+ info->id.numid = 0;
memset(&kctl, 0, sizeof(kctl));
down_write(&card->controls_rwsem);
- _kctl = snd_ctl_find_id(card, &info.id);
+ _kctl = snd_ctl_find_id(card, &info->id);
err = 0;
if (_kctl) {
if (replace)
@@ -886,67 +886,50 @@
up_write(&card->controls_rwsem);
if (err < 0)
return err;
- memcpy(&kctl.id, &info.id, sizeof(info.id));
- kctl.count = info.owner ? info.owner : 1;
+ memcpy(&kctl.id, &info->id, sizeof(info->id));
+ kctl.count = info->owner ? info->owner : 1;
access |= SNDRV_CTL_ELEM_ACCESS_USER;
kctl.info = snd_ctl_elem_user_info;
if (access & SNDRV_CTL_ELEM_ACCESS_READ)
kctl.get = snd_ctl_elem_user_get;
if (access & SNDRV_CTL_ELEM_ACCESS_WRITE)
kctl.put = snd_ctl_elem_user_put;
- extra_size = 0;
- switch (info.type) {
+ switch (info->type) {
case SNDRV_CTL_ELEM_TYPE_BOOLEAN:
private_size = sizeof(char);
- if (info.count > 128)
+ if (info->count > 128)
return -EINVAL;
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER:
private_size = sizeof(long);
- if (info.count > 128)
+ if (info->count > 128)
return -EINVAL;
break;
case SNDRV_CTL_ELEM_TYPE_INTEGER64:
private_size = sizeof(long long);
- if (info.count > 64)
+ if (info->count > 64)
return -EINVAL;
break;
- case SNDRV_CTL_ELEM_TYPE_ENUMERATED:
- private_size = sizeof(unsigned int);
- if (info.count > 128)
- return -EINVAL;
- if (info.value.enumerated.items > 128)
- return -EINVAL;
- extra_size = info.value.enumerated.items * 64;
- break;
case SNDRV_CTL_ELEM_TYPE_BYTES:
private_size = sizeof(unsigned char);
- if (info.count > 512)
+ if (info->count > 512)
return -EINVAL;
break;
case SNDRV_CTL_ELEM_TYPE_IEC958:
private_size = sizeof(struct sndrv_aes_iec958);
- if (info.count != 1)
+ if (info->count != 1)
return -EINVAL;
break;
default:
return -EINVAL;
}
- private_size *= info.count;
- ue = kcalloc(1, sizeof(struct user_element) + private_size + extra_size, GFP_KERNEL);
+ private_size *= info->count;
+ ue = kcalloc(1, sizeof(struct user_element) + private_size, GFP_KERNEL);
if (ue == NULL)
return -ENOMEM;
- ue->info = info;
+ ue->info = *info;
ue->elem_data = (char *)ue + sizeof(ue);
ue->elem_data_size = private_size;
- if (extra_size) {
- ue->priv_data = (char *)ue + sizeof(ue) + private_size;
- ue->priv_data_size = extra_size;
- if (ue->info.type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) {
- if (copy_from_user(ue->priv_data, *(char __user **)info.value.enumerated.name, extra_size))
- return -EFAULT;
- }
- }
kctl.private_free = snd_ctl_elem_user_free;
_kctl = snd_ctl_new(&kctl, access);
if (_kctl == NULL) {
@@ -969,6 +952,14 @@
return 0;
}

+static int snd_ctl_elem_add_user(snd_ctl_file_t *file, snd_ctl_elem_info_t __user *_info, int replace)
+{
+ snd_ctl_elem_info_t info;
+ if (copy_from_user(&info, _info, sizeof(info)))
+ return -EFAULT;
+ return snd_ctl_elem_add(file, &info, replace);
+}
+
static int snd_ctl_elem_remove(snd_ctl_file_t *file, snd_ctl_elem_id_t __user *_id)
{
snd_ctl_elem_id_t id;
@@ -1039,8 +1030,7 @@
}
#endif

-static inline int _snd_ctl_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
+static long snd_ctl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
snd_ctl_file_t *ctl;
snd_card_t *card;
@@ -1061,7 +1051,7 @@
case SNDRV_CTL_IOCTL_ELEM_LIST:
return snd_ctl_elem_list(ctl->card, argp);
case SNDRV_CTL_IOCTL_ELEM_INFO:
- return snd_ctl_elem_info(ctl, argp);
+ return snd_ctl_elem_info_user(ctl, argp);
case SNDRV_CTL_IOCTL_ELEM_READ:
return snd_ctl_elem_read_user(ctl->card, argp);
case SNDRV_CTL_IOCTL_ELEM_WRITE:
@@ -1071,7 +1061,7 @@
case SNDRV_CTL_IOCTL_ELEM_UNLOCK:
return snd_ctl_elem_unlock(ctl, argp);
case SNDRV_CTL_IOCTL_ELEM_ADD:
- return snd_ctl_elem_add(ctl, argp, 0);
+ return snd_ctl_elem_add_user(ctl, argp, 0);
case SNDRV_CTL_IOCTL_ELEM_REPLACE:
return snd_ctl_elem_add(ctl, argp, 1);
case SNDRV_CTL_IOCTL_ELEM_REMOVE:
@@ -1113,17 +1103,6 @@
return -ENOTTY;
}

-/* FIXME: need to unlock BKL to allow preemption */
-static int snd_ctl_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int err;
- unlock_kernel();
- err = _snd_ctl_ioctl(inode, file, cmd, arg);
- lock_kernel();
- return err;
-}
-
static ssize_t snd_ctl_read(struct file *file, char __user *buffer, size_t count, loff_t * offset)
{
snd_ctl_file_t *ctl;
@@ -1199,7 +1178,7 @@
* register the device-specific control-ioctls.
* called from each device manager like pcm.c, hwdep.c, etc.
*/
-int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
+static int _snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
{
snd_kctl_ioctl_t *pn;

@@ -1208,22 +1187,34 @@
return -ENOMEM;
pn->fioctl = fcn;
down_write(&snd_ioctl_rwsem);
- list_add_tail(&pn->list, &snd_control_ioctls);
+ list_add_tail(&pn->list, lists);
up_write(&snd_ioctl_rwsem);
return 0;
}

+int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn)
+{
+ return _snd_ctl_register_ioctl(fcn, &snd_control_ioctls);
+}
+
+#ifdef CONFIG_COMPAT
+int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn)
+{
+ return _snd_ctl_register_ioctl(fcn, &snd_control_compat_ioctls);
+}
+#endif
+
/*
* de-register the device-specific control-ioctls.
*/
-int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
+static int _snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn, struct list_head *lists)
{
struct list_head *list;
snd_kctl_ioctl_t *p;

snd_runtime_check(fcn != NULL, return -EINVAL);
down_write(&snd_ioctl_rwsem);
- list_for_each(list, &snd_control_ioctls) {
+ list_for_each(list, lists) {
p = list_entry(list, snd_kctl_ioctl_t, list);
if (p->fioctl == fcn) {
list_del(&p->list);
@@ -1237,6 +1228,19 @@
return -EINVAL;
}

+int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn)
+{
+ return _snd_ctl_unregister_ioctl(fcn, &snd_control_ioctls);
+}
+
+#ifdef CONFIG_COMPAT
+int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn)
+{
+ return _snd_ctl_unregister_ioctl(fcn, &snd_control_compat_ioctls);
+}
+
+#endif
+
static int snd_ctl_fasync(int fd, struct file * file, int on)
{
snd_ctl_file_t *ctl;
@@ -1249,6 +1253,15 @@
}

/*
+ * ioctl32 compat
+ */
+#ifdef CONFIG_COMPAT
+#include "control_compat.c"
+#else
+#define snd_ctl_ioctl_compat NULL
+#endif
+
+/*
* INIT PART
*/

@@ -1259,7 +1272,8 @@
.open = snd_ctl_open,
.release = snd_ctl_release,
.poll = snd_ctl_poll,
- .ioctl = snd_ctl_ioctl,
+ .unlocked_ioctl = snd_ctl_ioctl,
+ .compat_ioctl = snd_ctl_ioctl_compat,
.fasync = snd_ctl_fasync,
};

--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ linux/sound/core/control_compat.c 18 Jan 2005 14:52:14 -0000
@@ -0,0 +1,412 @@
+/*
+ * 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 sndrv_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(snd_card_t *card, struct sndrv_ctl_elem_list32 __user *data32)
+{
+ struct sndrv_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 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 int snd_ctl_elem_info_compat(snd_ctl_file_t *ctl, struct sndrv_ctl_elem_info32 __user *data32)
+{
+ struct sndrv_ctl_elem_info *data;
+ int err;
+
+ data = kcalloc(1, 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 sndrv_ctl_elem_value32 {
+ struct sndrv_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(snd_card_t *card, snd_ctl_elem_id_t *id, int *countp)
+{
+ snd_kcontrol_t *kctl;
+ snd_ctl_elem_info_t 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.id = *id;
+ err = kctl->info(kctl, &info);
+ up_read(&card->controls_rwsem);
+ if (err >= 0) {
+ err = info.type;
+ *countp = info.count;
+ }
+ 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 sndrv_aes_iec958);
+ default:
+ return -1;
+ }
+}
+
+static int copy_ctl_value_from_user(snd_card_t *card,
+ struct sndrv_ctl_elem_value *data,
+ struct sndrv_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 sndrv_ctl_elem_value32 __user *data32,
+ struct sndrv_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(snd_card_t *card,
+ struct sndrv_ctl_elem_value32 __user *data32)
+{
+ struct sndrv_ctl_elem_value *data;
+ int err, type, count;
+
+ data = kcalloc(1, 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(snd_ctl_file_t *file,
+ struct sndrv_ctl_elem_value32 __user *data32)
+{
+ struct sndrv_ctl_elem_value *data;
+ int err, type, count;
+
+ data = kcalloc(1, 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(snd_ctl_file_t *file,
+ struct sndrv_ctl_elem_info32 __user *data32,
+ int replace)
+{
+ struct sndrv_ctl_elem_info *data;
+ int err;
+
+ data = kcalloc(1, 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 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),
+ SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct sndrv_ctl_elem_info32),
+ SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct sndrv_ctl_elem_info32),
+};
+
+static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ snd_ctl_file_t *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) {
+ snd_kctl_ioctl_t *p = list_entry(list, snd_kctl_ioctl_t, 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;
+}
--- linux/sound/core/sound.c 22 Dec 2004 15:57:37 -0000 1.66
+++ linux/sound/core/sound.c 18 Jan 2005 15:37:49 -0000
@@ -467,6 +467,10 @@
EXPORT_SYMBOL(snd_ctl_notify);
EXPORT_SYMBOL(snd_ctl_register_ioctl);
EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
+#ifdef CONFIG_COMPAT
+EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
+EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
+#endif
EXPORT_SYMBOL(snd_ctl_elem_read);
EXPORT_SYMBOL(snd_ctl_elem_write);
/* misc.c */
--- linux/include/sound/control.h 23 Dec 2004 14:49:28 -0000 1.12
+++ linux/include/sound/control.h 12 Jan 2005 22:49:21 -0000
@@ -119,6 +119,13 @@

int snd_ctl_register_ioctl(snd_kctl_ioctl_func_t fcn);
int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn);
+#ifdef CONFIG_COMPAT
+int snd_ctl_register_ioctl_compat(snd_kctl_ioctl_func_t fcn);
+int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn);
+#else
+#define snd_ctl_register_ioctl_compat(fcn)
+#define snd_ctl_unregister_ioctl_compat(fcn)
+#endif

int snd_ctl_elem_read(snd_card_t *card, snd_ctl_elem_value_t *control);
int snd_ctl_elem_write(snd_card_t *card, snd_ctl_file_t *file, snd_ctl_elem_value_t *control);
-
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