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Sourcecode: alsa-driver version File versions

pcm32_new.c

/*
 *   32bit -> 64bit ioctl wrapper for PCM 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 "adriver.h"
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/minors.h>
#include "ioctl32.h"


/* wrapper for snd_pcm_[us]frames */
struct snd_pcm_sframes_str {
      snd_pcm_sframes_t val;
};
struct snd_pcm_sframes_str32 {
      s32 val;
};
struct snd_pcm_uframes_str {
      snd_pcm_uframes_t val;
};
struct snd_pcm_uframes_str32 {
      u32 val;
};

#define CVT_snd_pcm_sframes_str() { COPY_CVT(val); }
#define CVT_snd_pcm_uframes_str() { COPY_CVT(val); }


struct snd_pcm_hw_params32 {
      u32 flags;
      struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; /* this must be identical */
      struct snd_mask mres[5];      /* reserved masks */
      struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
      struct snd_interval ires[9];  /* reserved intervals */
      u32 rmask;
      u32 cmask;
      u32 info;
      u32 msbits;
      u32 rate_num;
      u32 rate_den;
      u32 fifo_size;
      unsigned char reserved[64];
} __attribute__((packed));

struct snd_pcm_sw_params32 {
      s32 tstamp_mode;
      u32 period_step;
      u32 sleep_min;
      u32 avail_min;
      u32 xfer_align;
      u32 start_threshold;
      u32 stop_threshold;
      u32 silence_threshold;
      u32 silence_size;
      u32 boundary;
      unsigned char reserved[64];
} __attribute__((packed));

#define CVT_snd_pcm_sw_params()\
{\
      COPY(tstamp_mode);\
      COPY(period_step);\
      COPY(sleep_min);\
      COPY_CVT(avail_min);\
      COPY_CVT(xfer_align);\
      COPY_CVT(start_threshold);\
      COPY_CVT(stop_threshold);\
      COPY_CVT(silence_threshold);\
      COPY_CVT(silence_size);\
      COPY_CVT(boundary);\
}

struct snd_pcm_channel_info32 {
      u32 channel;
      u32 offset;
      u32 first;
      u32 step;
} __attribute__((packed));

#define CVT_snd_pcm_channel_info()\
{\
      COPY(channel);\
      COPY_CVT(offset);\
      COPY(first);\
      COPY(step);\
}

struct snd_pcm_status32 {
      s32 state;
      struct compat_timespec trigger_tstamp;
      struct compat_timespec tstamp;
      u32 appl_ptr;
      u32 hw_ptr;
      s32 delay;
      u32 avail;
      u32 avail_max;
      u32 overrange;
      s32 suspended_state;
      unsigned char reserved[60];
} __attribute__((packed));

#define CVT_snd_pcm_status()\
{\
      COPY(state);\
      COPY_CVT(trigger_tstamp.tv_sec);\
      COPY_CVT(trigger_tstamp.tv_nsec);\
      COPY_CVT(tstamp.tv_sec);\
      COPY_CVT(tstamp.tv_nsec);\
      COPY_CVT(appl_ptr);\
      COPY_CVT(hw_ptr);\
      COPY_CVT(delay);\
      COPY_CVT(avail);\
      COPY_CVT(avail_max);\
      COPY_CVT(overrange);\
      COPY(suspended_state);\
}

DEFINE_ALSA_IOCTL(pcm_uframes_str);
DEFINE_ALSA_IOCTL(pcm_sframes_str);
DEFINE_ALSA_IOCTL(pcm_sw_params);
DEFINE_ALSA_IOCTL(pcm_channel_info);
DEFINE_ALSA_IOCTL(pcm_status);

/* sanity device check */
static int sanity_check_pcm(struct file *file)
{
      unsigned int minor;

      if (imajor(file->f_dentry->d_inode) != snd_major)
            return -ENOTTY;
      minor = iminor(file->f_dentry->d_inode);
      if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
          !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE))
            return -ENOTTY;
      return 0;
}

/* recalcuate the boundary within 32bit */
static void recalculate_boundary(struct snd_pcm_runtime *runtime)
{
      if (! runtime->buffer_size)
            return;
      runtime->boundary = runtime->buffer_size;
      while (runtime->boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
            runtime->boundary *= 2;
}

int snd_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);

/* both for HW_PARAMS and HW_REFINE */
static int _snd_ioctl32_pcm_hw_params(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
      struct snd_pcm_hw_params32 __user *data32;
      struct snd_pcm_hw_params *data;
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_pcm_runtime *runtime;
      int err;

      if (sanity_check_pcm(file))
            return -ENOTTY;
      if (! (pcm_file = file->private_data))
            return -ENOTTY;
      if (! (substream = pcm_file->substream))
            return -ENOTTY;
      if (! (runtime = substream->runtime))
            return -ENOTTY;

      data32 = compat_ptr(arg);
      data = kmalloc(sizeof(*data), GFP_KERNEL);
      if (data == NULL)
            return -ENOMEM;
      if (copy_from_user(data, data32, sizeof(*data32))) {
            err = -EFAULT;
            goto error;
      }
      if (native_ctl == SNDRV_PCM_IOCTL_HW_REFINE)
            err = snd_pcm_hw_refine(substream, data);
      else
            err = snd_pcm_hw_params(substream, data);
      if (err < 0)
            goto error;
      if (copy_to_user(data32, data, sizeof(*data32)) ||
          __put_user((u32)data->fifo_size, &data32->fifo_size)) {
            err = -EFAULT;
            goto error;
      }

      if (native_ctl == SNDRV_PCM_IOCTL_HW_PARAMS)
            recalculate_boundary(runtime);
 error:
      kfree(data);
      return err;
}


/*
 */
struct snd_xferi32 {
      s32 result;
      u32 buf;
      u32 frames;
} __attribute__((packed));

static int _snd_ioctl32_xferi(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
      struct snd_xferi32 data32;
      struct snd_xferi __user *data;
      snd_pcm_sframes_t result;
      int err;

      if (copy_from_user(&data32, (void __user *)arg, sizeof(data32)))
            return -EFAULT;
      data = compat_alloc_user_space(sizeof(*data));
      if (put_user((snd_pcm_sframes_t)data32.result, &data->result) ||
          __put_user(compat_ptr(data32.buf), &data->buf) ||
          __put_user((snd_pcm_uframes_t)data32.frames, &data->frames))
            return -EFAULT;
      err = file->f_op->ioctl(file->f_dentry->d_inode, file, native_ctl, (unsigned long)data);
      if (err < 0)
            return err;
      /* copy the result */
      if (__get_user(result, &data->result))
            return -EFAULT;
      data32.result = result;
      if (copy_to_user((void __user *)arg, &data32, sizeof(data32)))
            return -EFAULT;
      return 0;
}


/* snd_xfern needs remapping of bufs */
struct snd_xfern32 {
      s32 result;
      u32 bufs;  /* this is void **; */
      u32 frames;
} __attribute__((packed));

/*
 * xfern ioctl nees to copy (up to) 128 pointers on stack.
 * although we may pass the copied pointers through f_op->ioctl, but the ioctl
 * handler there expands again the same 128 pointers on stack, so it is better
 * to handle the function (calling pcm_readv/writev) directly in this handler.
 */
static int _snd_ioctl32_xfern(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *file, unsigned int native_ctl)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      struct snd_xfern32 __user *srcptr = compat_ptr(arg);
      struct snd_xfern32 data32;
      void __user **bufs;
      int err = 0, ch, i;
      u32 __user *bufptr;

      if (sanity_check_pcm(file))
            return -ENOTTY;
      if (! (pcm_file = file->private_data))
            return -ENOTTY;
      if (! (substream = pcm_file->substream))
            return -ENOTTY;
      if (! substream->runtime)
            return -ENOTTY;

      /* check validty of the command */
      switch (native_ctl) {
      case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
            if (substream->stream  != SNDRV_PCM_STREAM_PLAYBACK)
                  return -EINVAL;
            if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN)
                  return -EBADFD;
            break;
      case SNDRV_PCM_IOCTL_READN_FRAMES:
            if (substream->stream  != SNDRV_PCM_STREAM_CAPTURE)
                  return -EINVAL;
            break;
      }
      if ((ch = substream->runtime->channels) > 128)
            return -EINVAL;
      if (copy_from_user(&data32, (void __user *)arg, sizeof(data32)))
            return -EFAULT;
      bufptr = compat_ptr(data32.bufs);
      bufs = kmalloc(sizeof(void __user *) * ch, GFP_KERNEL);
      if (bufs == NULL)
            return -ENOMEM;
      for (i = 0; i < ch; i++) {
            u32 ptr;
            if (get_user(ptr, bufptr)) {
                  kfree(bufs);
                  return -EFAULT;
            }
            bufs[ch] = compat_ptr(ptr);
            bufptr++;
      }
      switch (native_ctl) {
      case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
            err = snd_pcm_lib_writev(substream, bufs, data32.frames);
            break;
      case SNDRV_PCM_IOCTL_READN_FRAMES:
            err = snd_pcm_lib_readv(substream, bufs, data32.frames);
            break;
      }
      if (err >= 0) {
            if (put_user(err, &srcptr->result))
                  err = -EFAULT;
      }
      kfree(bufs);
      return err;
}


struct snd_pcm_mmap_status32 {
      s32 state;
      s32 pad1;
      u32 hw_ptr;
      struct compat_timespec tstamp;
      s32 suspended_state;
} __attribute__((packed));

struct snd_pcm_mmap_control32 {
      u32 appl_ptr;
      u32 avail_min;
} __attribute__((packed));

struct snd_pcm_sync_ptr32 {
      u32 flags;
      union {
            struct snd_pcm_mmap_status32 status;
            unsigned char reserved[64];
      } s;
      union {
            struct snd_pcm_mmap_control32 control;
            unsigned char reserved[64];
      } c;
} __attribute__((packed));

#define CVT_snd_pcm_sync_ptr()\
{\
      COPY(flags);\
      COPY(s.status.state);\
      COPY(s.status.pad1);\
      COPY_CVT(s.status.hw_ptr);\
      COPY_CVT(s.status.tstamp.tv_sec);\
      COPY_CVT(s.status.tstamp.tv_nsec);\
      COPY(s.status.suspended_state);\
      COPY_CVT(c.control.appl_ptr);\
      COPY_CVT(c.control.avail_min);\
}

DEFINE_ALSA_IOCTL(pcm_sync_ptr);

/*
 */

DEFINE_ALSA_IOCTL_ENTRY(pcm_hw_refine, pcm_hw_params, SNDRV_PCM_IOCTL_HW_REFINE);
DEFINE_ALSA_IOCTL_ENTRY(pcm_hw_params, pcm_hw_params, SNDRV_PCM_IOCTL_HW_PARAMS);
DEFINE_ALSA_IOCTL_ENTRY(pcm_sw_params, pcm_sw_params, SNDRV_PCM_IOCTL_SW_PARAMS);
DEFINE_ALSA_IOCTL_ENTRY(pcm_status, pcm_status, SNDRV_PCM_IOCTL_STATUS);
DEFINE_ALSA_IOCTL_ENTRY(pcm_delay, pcm_sframes_str, SNDRV_PCM_IOCTL_DELAY);
DEFINE_ALSA_IOCTL_ENTRY(pcm_channel_info, pcm_channel_info, SNDRV_PCM_IOCTL_CHANNEL_INFO);
DEFINE_ALSA_IOCTL_ENTRY(pcm_rewind, pcm_uframes_str, SNDRV_PCM_IOCTL_REWIND);
DEFINE_ALSA_IOCTL_ENTRY(pcm_forward, pcm_uframes_str, SNDRV_PCM_IOCTL_FORWARD);
DEFINE_ALSA_IOCTL_ENTRY(pcm_readi, xferi, SNDRV_PCM_IOCTL_READI_FRAMES);
DEFINE_ALSA_IOCTL_ENTRY(pcm_writei, xferi, SNDRV_PCM_IOCTL_WRITEI_FRAMES);
DEFINE_ALSA_IOCTL_ENTRY(pcm_readn, xfern, SNDRV_PCM_IOCTL_READN_FRAMES);
DEFINE_ALSA_IOCTL_ENTRY(pcm_writen, xfern, SNDRV_PCM_IOCTL_WRITEN_FRAMES);
DEFINE_ALSA_IOCTL_ENTRY(pcm_sync_ptr, pcm_sync_ptr, SNDRV_PCM_IOCTL_SYNC_PTR);


/*
 * When PCM is used on 32bit mode, we need to disable
 * mmap of PCM status/control records because of the size
 * incompatibility.
 * 
 * Since INFO ioctl is always called at first, we mark the
 * mmap-disabling in this ioctl wrapper.
 */
static int snd_pcm_info_ioctl32(unsigned int fd, unsigned int cmd, unsigned long arg, struct file *filp)
{
      struct snd_pcm_file *pcm_file;
      struct snd_pcm_substream *substream;
      if (! filp->f_op || ! filp->f_op->ioctl)
            return -ENOTTY;
      pcm_file = filp->private_data;
      if (! pcm_file)
            return -ENOTTY;
      substream = pcm_file->substream;
      if (! substream)
            return -ENOTTY;
      pcm_file->no_compat_mmap = 1;
      return filp->f_op->ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
}

/*
 */
#define AP(x) snd_ioctl32_##x

enum {
      SNDRV_PCM_IOCTL_HW_REFINE32 = _IOWR('A', 0x10, struct snd_pcm_hw_params32),
      SNDRV_PCM_IOCTL_HW_PARAMS32 = _IOWR('A', 0x11, struct snd_pcm_hw_params32),
      SNDRV_PCM_IOCTL_SW_PARAMS32 = _IOWR('A', 0x13, struct snd_pcm_sw_params32),
      SNDRV_PCM_IOCTL_STATUS32 = _IOR('A', 0x20, struct snd_pcm_status32),
      SNDRV_PCM_IOCTL_DELAY32 = _IOR('A', 0x21, s32),
      SNDRV_PCM_IOCTL_CHANNEL_INFO32 = _IOR('A', 0x32, struct snd_pcm_channel_info32),
      SNDRV_PCM_IOCTL_REWIND32 = _IOW('A', 0x46, u32),
      SNDRV_PCM_IOCTL_FORWARD32 = _IOW('A', 0x49, u32),
      SNDRV_PCM_IOCTL_WRITEI_FRAMES32 = _IOW('A', 0x50, struct snd_xferi32),
      SNDRV_PCM_IOCTL_READI_FRAMES32 = _IOR('A', 0x51, struct snd_xferi32),
      SNDRV_PCM_IOCTL_WRITEN_FRAMES32 = _IOW('A', 0x52, struct snd_xfern32),
      SNDRV_PCM_IOCTL_READN_FRAMES32 = _IOR('A', 0x53, struct snd_xfern32),
      SNDRV_PCM_IOCTL_SYNC_PTR32 = _IOWR('A', 0x23, struct snd_pcm_sync_ptr32),

};

struct ioctl32_mapper pcm_mappers[] = {
      MAP_COMPAT(SNDRV_PCM_IOCTL_PVERSION),
      /* MAP_COMPAT(SNDRV_PCM_IOCTL_INFO), */
      { SNDRV_PCM_IOCTL_INFO, snd_pcm_info_ioctl32 },
      MAP_COMPAT(SNDRV_PCM_IOCTL_TSTAMP),
      MAP_COMPAT(SNDRV_PCM_IOCTL_TTSTAMP),
      { SNDRV_PCM_IOCTL_HW_REFINE32, AP(pcm_hw_refine) },
      { SNDRV_PCM_IOCTL_HW_PARAMS32, AP(pcm_hw_params) },
      MAP_COMPAT(SNDRV_PCM_IOCTL_HW_FREE),
      { SNDRV_PCM_IOCTL_SW_PARAMS32, AP(pcm_sw_params) },
      { SNDRV_PCM_IOCTL_STATUS32, AP(pcm_status) },
      { SNDRV_PCM_IOCTL_DELAY32, AP(pcm_delay) },
      MAP_COMPAT(SNDRV_PCM_IOCTL_HWSYNC),
      { SNDRV_PCM_IOCTL_SYNC_PTR32, AP(pcm_sync_ptr) },
      { SNDRV_PCM_IOCTL_CHANNEL_INFO32, AP(pcm_channel_info) },
      MAP_COMPAT(SNDRV_PCM_IOCTL_PREPARE),
      MAP_COMPAT(SNDRV_PCM_IOCTL_RESET),
      MAP_COMPAT(SNDRV_PCM_IOCTL_START),
      MAP_COMPAT(SNDRV_PCM_IOCTL_DROP),
      MAP_COMPAT(SNDRV_PCM_IOCTL_DRAIN),
      MAP_COMPAT(SNDRV_PCM_IOCTL_PAUSE),
      { SNDRV_PCM_IOCTL_REWIND32, AP(pcm_rewind) },
      MAP_COMPAT(SNDRV_PCM_IOCTL_RESUME),
      MAP_COMPAT(SNDRV_PCM_IOCTL_XRUN),
      { SNDRV_PCM_IOCTL_FORWARD32, AP(pcm_forward) },
      { SNDRV_PCM_IOCTL_WRITEI_FRAMES32, AP(pcm_writei) },
      { SNDRV_PCM_IOCTL_READI_FRAMES32, AP(pcm_readi) },
      { SNDRV_PCM_IOCTL_WRITEN_FRAMES32, AP(pcm_writen) },
      { SNDRV_PCM_IOCTL_READN_FRAMES32, AP(pcm_readn) },
      MAP_COMPAT(SNDRV_PCM_IOCTL_LINK),
      MAP_COMPAT(SNDRV_PCM_IOCTL_UNLINK),

      { 0 },
};

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