305 lines
7.6 KiB
C
305 lines
7.6 KiB
C
/*
|
|
* File : devfs.c
|
|
* This file is part of Device File System in RT-Thread RTOS
|
|
* COPYRIGHT (C) 2004-2011, RT-Thread Development Team
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
*/
|
|
|
|
#include <rtthread.h>
|
|
#include <dfs.h>
|
|
#include <dfs_fs.h>
|
|
|
|
#include "devfs.h"
|
|
|
|
struct device_dirent
|
|
{
|
|
rt_device_t *devices;
|
|
rt_uint16_t read_index;
|
|
rt_uint16_t device_count;
|
|
};
|
|
|
|
int dfs_device_fs_mount(struct dfs_filesystem *fs, unsigned long rwflag, const void *data)
|
|
{
|
|
return DFS_STATUS_OK;
|
|
}
|
|
|
|
int dfs_device_fs_ioctl(struct dfs_fd *file, int cmd, void *args)
|
|
{
|
|
rt_err_t result;
|
|
rt_device_t dev_id;
|
|
|
|
RT_ASSERT(file != RT_NULL);
|
|
|
|
/* get device handler */
|
|
dev_id = (rt_device_t)file->data;
|
|
RT_ASSERT(dev_id != RT_NULL);
|
|
|
|
/* close device handler */
|
|
result = rt_device_control(dev_id, cmd, args);
|
|
if (result == RT_EOK)
|
|
return DFS_STATUS_OK;
|
|
|
|
return -DFS_STATUS_EIO;
|
|
}
|
|
|
|
int dfs_device_fs_read(struct dfs_fd *file, void *buf, rt_size_t count)
|
|
{
|
|
int result;
|
|
rt_device_t dev_id;
|
|
|
|
RT_ASSERT(file != RT_NULL);
|
|
|
|
/* get device handler */
|
|
dev_id = (rt_device_t)file->data;
|
|
RT_ASSERT(dev_id != RT_NULL);
|
|
|
|
/* read device data */
|
|
result = rt_device_read(dev_id, file->pos, buf, count);
|
|
file->pos += result;
|
|
|
|
return result;
|
|
}
|
|
|
|
int dfs_device_fs_write(struct dfs_fd *file, const void *buf, rt_size_t count)
|
|
{
|
|
int result;
|
|
rt_device_t dev_id;
|
|
|
|
RT_ASSERT(file != RT_NULL);
|
|
|
|
/* get device handler */
|
|
dev_id = (rt_device_t)file->data;
|
|
RT_ASSERT(dev_id != RT_NULL);
|
|
|
|
/* read device data */
|
|
result = rt_device_write(dev_id, file->pos, buf, count);
|
|
file->pos += result;
|
|
|
|
return result;
|
|
}
|
|
|
|
int dfs_device_fs_close(struct dfs_fd *file)
|
|
{
|
|
rt_err_t result;
|
|
rt_device_t dev_id;
|
|
|
|
RT_ASSERT(file != RT_NULL);
|
|
|
|
if (file->type == FT_DIRECTORY)
|
|
{
|
|
struct device_dirent *root_dirent;
|
|
|
|
root_dirent = (struct device_dirent *)file->data;
|
|
RT_ASSERT(root_dirent != RT_NULL);
|
|
|
|
/* release dirent */
|
|
rt_free(root_dirent);
|
|
return DFS_STATUS_OK;
|
|
}
|
|
|
|
/* get device handler */
|
|
dev_id = (rt_device_t)file->data;
|
|
RT_ASSERT(dev_id != RT_NULL);
|
|
|
|
/* close device handler */
|
|
result = rt_device_close(dev_id);
|
|
if (result == RT_EOK)
|
|
{
|
|
file->data = RT_NULL;
|
|
|
|
return DFS_STATUS_OK;
|
|
}
|
|
|
|
return -DFS_STATUS_EIO;
|
|
}
|
|
|
|
int dfs_device_fs_open(struct dfs_fd *file)
|
|
{
|
|
rt_device_t device;
|
|
|
|
if (file->flags & DFS_O_CREAT)
|
|
return -DFS_STATUS_EINVAL;
|
|
|
|
/* open root directory */
|
|
if ((file->path[0] == '/') && (file->path[1] == '\0') &&
|
|
(file->flags & DFS_O_DIRECTORY))
|
|
{
|
|
struct rt_object *object;
|
|
struct rt_list_node *node;
|
|
struct rt_object_information *information;
|
|
struct device_dirent *root_dirent;
|
|
rt_uint32_t count = 0;
|
|
|
|
extern struct rt_object_information rt_object_container[];
|
|
|
|
/* lock scheduler */
|
|
rt_enter_critical();
|
|
|
|
/* traverse device object */
|
|
information = &rt_object_container[RT_Object_Class_Device];
|
|
for (node = information->object_list.next; node != &(information->object_list); node = node->next)
|
|
{
|
|
count ++;
|
|
}
|
|
|
|
root_dirent = (struct device_dirent *)rt_malloc(sizeof(struct device_dirent) +
|
|
count * sizeof(rt_device_t));
|
|
if (root_dirent != RT_NULL)
|
|
{
|
|
root_dirent->devices = (rt_device_t *)(root_dirent + 1);
|
|
root_dirent->read_index = 0;
|
|
root_dirent->device_count = count;
|
|
count = 0;
|
|
/* get all device node */
|
|
for (node = information->object_list.next; node != &(information->object_list); node = node->next)
|
|
{
|
|
object = rt_list_entry(node, struct rt_object, list);
|
|
root_dirent->devices[count] = (rt_device_t)object;
|
|
count ++;
|
|
}
|
|
}
|
|
rt_exit_critical();
|
|
|
|
/* set data */
|
|
file->data = root_dirent;
|
|
|
|
return DFS_STATUS_OK;
|
|
}
|
|
|
|
device = rt_device_find(&file->path[1]);
|
|
if (device == RT_NULL)
|
|
return -DFS_STATUS_ENODEV;
|
|
|
|
file->data = device;
|
|
|
|
return DFS_STATUS_OK;
|
|
}
|
|
|
|
int dfs_device_fs_stat(struct dfs_filesystem *fs, const char *path, struct stat *st)
|
|
{
|
|
/* stat root directory */
|
|
if ((path[0] == '/') && (path[1] == '\0'))
|
|
{
|
|
st->st_dev = 0;
|
|
|
|
st->st_mode = DFS_S_IFREG | DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
|
|
DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
|
|
st->st_mode &= ~DFS_S_IFREG;
|
|
st->st_mode |= DFS_S_IFDIR | DFS_S_IXUSR | DFS_S_IXGRP | DFS_S_IXOTH;
|
|
|
|
st->st_size = 0;
|
|
st->st_mtime = 0;
|
|
st->st_blksize = 512;
|
|
|
|
return DFS_STATUS_OK;
|
|
}
|
|
else
|
|
{
|
|
rt_device_t dev_id;
|
|
|
|
dev_id = rt_device_find(&path[1]);
|
|
if (dev_id != RT_NULL)
|
|
{
|
|
st->st_dev = 0;
|
|
|
|
st->st_mode = DFS_S_IRUSR | DFS_S_IRGRP | DFS_S_IROTH |
|
|
DFS_S_IWUSR | DFS_S_IWGRP | DFS_S_IWOTH;
|
|
|
|
if (dev_id->type == RT_Device_Class_Char)
|
|
st->st_mode |= DFS_S_IFCHR;
|
|
else if (dev_id->type == RT_Device_Class_Block)
|
|
st->st_mode |= DFS_S_IFBLK;
|
|
else
|
|
st->st_mode |= DFS_S_IFREG;
|
|
|
|
st->st_size = 0;
|
|
st->st_mtime = 0;
|
|
st->st_blksize = 512;
|
|
|
|
return DFS_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
return -DFS_STATUS_ENOENT;
|
|
}
|
|
|
|
int dfs_device_fs_getdents(struct dfs_fd *file, struct dirent *dirp, rt_uint32_t count)
|
|
{
|
|
rt_uint32_t index;
|
|
rt_object_t object;
|
|
struct dirent *d;
|
|
struct device_dirent *root_dirent;
|
|
|
|
root_dirent = (struct device_dirent *)file->data;
|
|
RT_ASSERT(root_dirent != RT_NULL);
|
|
|
|
/* make integer count */
|
|
count = (count / sizeof(struct dirent));
|
|
if (count == 0)
|
|
return -DFS_STATUS_EINVAL;
|
|
|
|
for (index = 0; index < count && index + root_dirent->read_index < root_dirent->device_count;
|
|
index ++)
|
|
{
|
|
object = (rt_object_t)root_dirent->devices[root_dirent->read_index + index];
|
|
|
|
d = dirp + index;
|
|
d->d_type = DFS_DT_REG;
|
|
d->d_namlen = RT_NAME_MAX;
|
|
d->d_reclen = (rt_uint16_t)sizeof(struct dirent);
|
|
rt_strncpy(d->d_name, object->name, RT_NAME_MAX);
|
|
}
|
|
|
|
root_dirent->read_index += index;
|
|
|
|
return index * sizeof(struct dirent);
|
|
}
|
|
|
|
static const struct dfs_filesystem_operation _device_fs =
|
|
{
|
|
"devfs",
|
|
DFS_FS_FLAG_DEFAULT,
|
|
dfs_device_fs_mount,
|
|
RT_NULL,
|
|
RT_NULL,
|
|
RT_NULL,
|
|
|
|
dfs_device_fs_open,
|
|
dfs_device_fs_close,
|
|
dfs_device_fs_ioctl,
|
|
dfs_device_fs_read,
|
|
dfs_device_fs_write,
|
|
RT_NULL,
|
|
RT_NULL,
|
|
dfs_device_fs_getdents,
|
|
RT_NULL,
|
|
dfs_device_fs_stat,
|
|
RT_NULL,
|
|
};
|
|
|
|
int devfs_init(void)
|
|
{
|
|
/* register rom file system */
|
|
dfs_register(&_device_fs);
|
|
|
|
return 0;
|
|
}
|
|
INIT_FS_EXPORT(devfs_init);
|
|
|