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//==========================================================================

//

//      devfs.cxx

//

//      Fileio device filesystem

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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 or (at your option) any later version.

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):           nickg

// Contributors:        nickg

// Date:                2000-05-25

// Purpose:             Fileio device filesystem

// Description:         This file implements a simple filesystem that interfaces

//                      to the existing device IO subsystem.

//                      

//              

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/hal.h>

#include <pkgconf/kernel.h>

#include <pkgconf/io_fileio.h>

#include <cyg/kernel/ktypes.h>         // base kernel types

#include <cyg/infra/cyg_trac.h>        // tracing macros

#include <cyg/infra/cyg_ass.h>         // assertion macros

#include "fio.h"                       // Private header

#include <cyg/io/devtab.h>              // device subsystem

#include <cyg/io/config_keys.h>         // CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN

//==========================================================================

// Forward definitions

// Filesystem operations

static int dev_mount    ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );

static int dev_umount   ( cyg_mtab_entry *mte );

static int dev_open     ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int mode,  cyg_file *fte );

static int dev_unlink   ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );

static int dev_mkdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );

static int dev_rmdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );

static int dev_rename   ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,

                          cyg_dir dir2, const char *name2 );

static int dev_link     ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,

                          cyg_dir dir2, const char *name2, int type );

static int dev_opendir  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          cyg_file *fte );

static int dev_chdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          cyg_dir *dir_out );

static int dev_stat     ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          struct stat *buf);

static int dev_getinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int key, void *buf, int len );

static int dev_setinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int key, void *buf, int len );

// File operations

static int dev_fo_read      (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);

static int dev_fo_write     (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);

static int dev_fo_lseek     (struct CYG_FILE_TAG *fp, off_t *pos, int whence );

static int dev_fo_ioctl     (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,

                             CYG_ADDRWORD data);

static int dev_fo_select    (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);

static int dev_fo_fsync     (struct CYG_FILE_TAG *fp, int mode );

static int dev_fo_close     (struct CYG_FILE_TAG *fp);

static int dev_fo_fstat     (struct CYG_FILE_TAG *fp, struct stat *buf );

static int dev_fo_getinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len );

static int dev_fo_setinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len );

//==========================================================================

// Filesystem table entries

FSTAB_ENTRY( dev_fste, "devfs", 0,

             CYG_SYNCMODE_NONE,         // dev system has its own sync mechanism

             dev_mount,

             dev_umount,

             dev_open,

             dev_unlink,

             dev_mkdir,

             dev_rmdir,

             dev_rename,

             dev_link,

             dev_opendir,

             dev_chdir,

             dev_stat,

             dev_getinfo,

             dev_setinfo);

MTAB_ENTRY( dev_mte,

                   "/dev",

                   "devfs",

                   "",

                   0);

static cyg_fileops dev_fileops =

{

    dev_fo_read,

    dev_fo_write,

    dev_fo_lseek,

    dev_fo_ioctl,

    dev_fo_select,

    dev_fo_fsync,

    dev_fo_close,

    dev_fo_fstat,

    dev_fo_getinfo,

    dev_fo_setinfo

};

//==========================================================================

// Filesystem operations

// -------------------------------------------------------------------------

static int dev_mount    ( cyg_fstab_entry *fste, cyg_mtab_entry *mte )

{

    // Nothing to do here. The device IO subsystem has already initialized

    // iteslf, and the fileio infrastructure will do the rest.

    return 0;

}

// -------------------------------------------------------------------------

static int dev_umount   ( cyg_mtab_entry *mte )

{

    // Nothing to do here.

    return 0;

}

// -------------------------------------------------------------------------

static int dev_open     ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int mode,  cyg_file *file )

{

    Cyg_ErrNo err;

    cyg_io_handle_t handle;

    // The name we are passed will point to the first character after

    // "/dev/". We know that the full string contains the prefix string,

    // so we back the pointer up by 5 chars.

    // A better approach would be for the device table entries to only

    // contain the part of the string after the prefix.

    name -= 5;

    err = cyg_io_lookup( name, &handle );

    if( err < 0 )

        return -err;

    // If we want non-blocking mode, configure the device for it.

    if( (mode & (O_NONBLOCK|O_RDONLY)) == (O_NONBLOCK|O_RDONLY) )

    {

        cyg_uint32 f = 0;

        cyg_uint32 fsize = sizeof(f);

        err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_READ_BLOCKING,

                                 (void *)&f, &fsize);

        if( err < 0 )

            return -err;

    }

    if( (mode & (O_NONBLOCK|O_WRONLY)) == (O_NONBLOCK|O_WRONLY) )

    {

        cyg_uint32 f = 0;

        cyg_uint32 fsize = sizeof(f);

        err = cyg_io_set_config( handle, CYG_IO_SET_CONFIG_WRITE_BLOCKING,

                                 (void *)&f, &fsize);

        if( err < 0 )

            return -err;

    }

    // Initialize the file object

    file->f_flag |= mode & CYG_FILE_MODE_MASK;

    file->f_type = CYG_FILE_TYPE_FILE;

    file->f_ops = &dev_fileops;

    file->f_offset = 0;

    file->f_data = (CYG_ADDRWORD)handle;

    file->f_xops = 0;

    return 0;

}

// -------------------------------------------------------------------------

static int dev_unlink   ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )

{

    return EROFS;

}

// -------------------------------------------------------------------------

static int dev_mkdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )

{

    return EROFS;

}

// -------------------------------------------------------------------------

static int dev_rmdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name )

{

    return EROFS;

}

// -------------------------------------------------------------------------

static int dev_rename   ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,

                          cyg_dir dir2, const char *name2 )

{

    return EROFS;

}

// -------------------------------------------------------------------------

static int dev_link     ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,

                          cyg_dir dir2, const char *name2, int type )

{

    return EROFS;

}

// -------------------------------------------------------------------------

static int dev_opendir  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          cyg_file *fte )

{

    return ENOTDIR;

}

// -------------------------------------------------------------------------

static int dev_chdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          cyg_dir *dir_out )

{

    return ENOTDIR;

}

// -------------------------------------------------------------------------

static int dev_stat     ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          struct stat *buf)

{

    Cyg_ErrNo err;

    cyg_io_handle_t handle;

    name -= 5;          // See comment in dev_open()

    err = cyg_io_lookup( name, &handle );

    if( err < 0 )

        return -err;

    // Just fill in the stat buffer with some constant values.

    // FIXME: change this when block devices are available

    buf->st_mode = __stat_mode_CHR;

    buf->st_ino         = (ino_t)handle;    // map dev handle to inode

    buf->st_dev         = 0; // (dev_t)handle;    // same with dev id

    buf->st_nlink       = 0;

    buf->st_uid         = 0;

    buf->st_gid         = 0;

    buf->st_size        = 0;

    buf->st_atime       = 0;

    buf->st_mtime       = 0;

    buf->st_ctime       = 0;

    return ENOERR;

}

// -------------------------------------------------------------------------

static int dev_getinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int key, void *buf, int len )

{

    return ENOSYS;

}

// -------------------------------------------------------------------------

static int dev_setinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,

                          int key, void *buf, int len )

{

    return ENOSYS;

}

//==========================================================================

// File operations

// -------------------------------------------------------------------------

static int dev_fo_read      (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)

{

    Cyg_ErrNo err = 0;

    int i;

    // Now loop over the iovecs until they are all done, or

    // we get an error.

    for( i = 0; i < uio->uio_iovcnt; i++ )

    {

        cyg_iovec *iov = &uio->uio_iov[i];

        cyg_uint32 len = iov->iov_len;

        cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;

        if (t->status & CYG_DEVTAB_STATUS_BLOCK)

            err = cyg_io_bread( (cyg_io_handle_t)t,

                                iov->iov_base,

                                &len, fp->f_offset);

        else

            err = cyg_io_read( (cyg_io_handle_t)t,

                               iov->iov_base,

                               &len);

        if( -EAGAIN == err ) // must be in non-blocking mode

        {

            uio->uio_resid -= len;

            return ENOERR;

        }

        if( err < 0 ) break;

        uio->uio_resid -= len;

    }

    return -err;

}

// -------------------------------------------------------------------------

static int dev_fo_write     (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)

{

    Cyg_ErrNo err = 0;

    int i;

    // Now loop over the iovecs until they are all done, or

    // we get an error.

    for( i = 0; i < uio->uio_iovcnt; i++ )

    {

        cyg_iovec *iov = &uio->uio_iov[i];

        cyg_uint32 len = iov->iov_len;

        cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;

        if (t->status & CYG_DEVTAB_STATUS_BLOCK)

            err = cyg_io_bwrite( (cyg_io_handle_t)t,

                                 iov->iov_base,

                                 &len, fp->f_offset);

        else

            err = cyg_io_write( (cyg_io_handle_t)t,

                                iov->iov_base,

                                &len);

        if( -EAGAIN == err ) // must be in non-blocking mode

        {

            uio->uio_resid -= len;

            return ENOERR;

        }

        if( err < 0 ) break;

        uio->uio_resid -= len;

    }

    return -err;

}

// -------------------------------------------------------------------------

static int dev_fo_lseek     (struct CYG_FILE_TAG *fp, off_t *pos, int whence )

{

    // All current devices have no notion of position. Just return zero

    // as the new position.

    *pos = 0;

    return ENOERR;

}

// -------------------------------------------------------------------------

static int dev_fo_ioctl     (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,

                             CYG_ADDRWORD data)

{

    return ENOSYS;

}

// -------------------------------------------------------------------------

static cyg_bool dev_fo_select    (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)

{

    return cyg_io_select( (cyg_io_handle_t)fp->f_data,

                          which,

                          info);

}

// -------------------------------------------------------------------------

static int dev_fo_fsync     (struct CYG_FILE_TAG *fp, int mode )

{

    Cyg_ErrNo err;

    err = cyg_io_get_config((cyg_io_handle_t)fp->f_data,

                            CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN,

                            NULL, NULL);

    return -err;

}

// -------------------------------------------------------------------------

static int dev_fo_close     (struct CYG_FILE_TAG *fp)

{

    return ENOERR;

}

// -------------------------------------------------------------------------

static int dev_fo_fstat     (struct CYG_FILE_TAG *fp, struct stat *buf )

{

    // Just fill in the stat buffer with some constant values.

    // FIXME: change this when block devices are available

    buf->st_mode = __stat_mode_CHR;

    buf->st_ino         = (ino_t)fp->f_data;    // map dev handle to inode

    buf->st_dev         = (dev_t)fp->f_data;    // same with dev id

    buf->st_nlink       = 0;

    buf->st_uid         = 0;

    buf->st_gid         = 0;

    buf->st_size        = 0;

    buf->st_atime       = 0;

    buf->st_mtime       = 0;

    buf->st_ctime       = 0;

    return ENOERR;

}

// -------------------------------------------------------------------------

static int dev_fo_getinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len )

{

    Cyg_ErrNo err = 0;

    cyg_uint32 ll = len;

    err = cyg_io_get_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );

    return -err;

}

// -------------------------------------------------------------------------

static int dev_fo_setinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len )

{

    Cyg_ErrNo err = 0;

    cyg_uint32 ll = len;

    err = cyg_io_set_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );

    return -err;

}

// -------------------------------------------------------------------------

// EOF devfs.cxx