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/*
* devfs.c - a device file system for U-Boot
*
* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 <common.h>
#include <driver.h>
#include <init.h>
#include <malloc.h>
#include <fs.h>
#include <command.h>
#include <errno.h>
#include <xfuncs.h>
#include <linux/stat.h>
static int devfs_read(struct device_d *_dev, FILE *f, void *buf, size_t size)
{
struct device_d *dev = f->inode;
return dev_read(dev, buf, size, f->pos, f->flags);
}
static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t size)
{
struct device_d *dev = f->inode;
return dev_write(dev, buf, size, f->pos, f->flags);
}
static off_t devfs_lseek(struct device_d *_dev, FILE *f, off_t pos)
{
struct device_d *dev = f->inode;
off_t ret;
ret = dev_lseek(dev, pos);
if (ret != -1)
f->pos = pos;
return ret;
}
static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, unsigned long offset)
{
struct device_d *dev = f->inode;
return dev_erase(dev, count, offset);
}
static int devfs_protect(struct device_d *_dev, FILE *f, size_t count, unsigned long offset, int prot)
{
struct device_d *dev = f->inode;
return dev_protect(dev, count, offset, prot);
}
static int devfs_memmap(struct device_d *_dev, FILE *f, void **map, int flags)
{
struct device_d *dev = f->inode;
return dev_memmap(dev, map, flags);
}
static int devfs_open(struct device_d *_dev, FILE *f, const char *filename)
{
struct device_d *dev = get_device_by_id(filename + 1);
if (!dev)
return -ENOENT;
f->size = dev->size;
f->inode = dev;
return dev_open(dev, f);
}
static int devfs_close(struct device_d *_dev, FILE *f)
{
struct device_d *dev = f->inode;
return dev_close(dev, f);
}
static int devfs_ioctl(struct device_d *_dev, FILE *f, int request, void *buf)
{
struct device_d *dev = f->inode;
return dev_ioctl(dev, request, buf);
}
static int devfs_truncate(struct device_d *dev, FILE *f, ulong size)
{
if (size > f->dev->size)
return -ENOSPC;
return 0;
}
static DIR* devfs_opendir(struct device_d *dev, const char *pathname)
{
DIR *dir;
dir = xzalloc(sizeof(DIR));
if (!list_empty(&device_list))
dir->priv = list_first_entry(&device_list, struct device_d, list);
return dir;
}
static struct dirent* devfs_readdir(struct device_d *_dev, DIR *dir)
{
struct device_d *dev = dir->priv;
if (!dev)
return NULL;
list_for_each_entry_from(dev, &device_list, list) {
if (!*dev->id)
continue;
if (!dev->driver)
continue;
strcpy(dir->d.d_name, dev->id);
dir->priv = list_entry(dev->list.next, struct device_d, list);
return &dir->d;
}
return NULL;
}
static int devfs_closedir(struct device_d *dev, DIR *dir)
{
free(dir);
return 0;
}
static int devfs_stat(struct device_d *_dev, const char *filename, struct stat *s)
{
struct device_d *dev;
dev = get_device_by_id(filename + 1);
if (!dev)
return -ENOENT;
if (!dev->driver)
return -ENXIO;
s->st_mode = S_IFCHR;
s->st_size = dev->size;
if (dev->driver->write)
s->st_mode |= S_IWUSR;
if (dev->driver->read)
s->st_mode |= S_IRUSR;
return 0;
}
static int devfs_probe(struct device_d *dev)
{
return 0;
}
static struct fs_driver_d devfs_driver = {
.type = FS_TYPE_DEVFS,
.read = devfs_read,
.write = devfs_write,
.lseek = devfs_lseek,
.open = devfs_open,
.close = devfs_close,
.ioctl = devfs_ioctl,
.opendir = devfs_opendir,
.readdir = devfs_readdir,
.truncate = devfs_truncate,
.closedir = devfs_closedir,
.stat = devfs_stat,
.erase = devfs_erase,
.protect = devfs_protect,
.memmap = devfs_memmap,
.flags = FS_DRIVER_NO_DEV,
.drv = {
.type = DEVICE_TYPE_FS,
.probe = devfs_probe,
.name = "devfs",
.type_data = &devfs_driver,
}
};
static int devfs_init(void)
{
return register_driver(&devfs_driver.drv);
}
device_initcall(devfs_init);
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