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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;

      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;
      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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