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root/sound/core/control_compat.c

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DEFINITIONS

This source file includes following definitions.
  1. snd_ctl_elem_list_compat
  2. snd_ctl_elem_info_compat
  3. get_ctl_type
  4. get_elem_size
  5. copy_ctl_value_from_user
  6. copy_ctl_value_to_user
  7. snd_ctl_elem_read_user_compat
  8. snd_ctl_elem_write_user_compat
  9. snd_ctl_elem_add_compat
  10. _IOWR
  11. _IOWR
  12. _IOWR
  13. _IOWR
  14. _IOWR
  15. _IOWR
  16. snd_ctl_ioctl_compat

/*
 * 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, 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++) {
                        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;
        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);
        }

        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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