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Sourcecode: alsa-driver version File versions

ioctl32_old.c

/*
 *   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_old.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)

EXPORT_NO_SYMBOLS;

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