185 lines
4.0 KiB
C
185 lines
4.0 KiB
C
/*
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* devfs.c - a device file system for U-Boot
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <fs.h>
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#include <command.h>
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#include <errno.h>
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#include <xfuncs.h>
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#include <linux/stat.h>
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static int devfs_read(struct device_d *_dev, FILE *f, void *buf, size_t size)
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{
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struct device_d *dev = f->inode;
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return dev_read(dev, buf, size, f->pos, f->flags);
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}
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static int devfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t size)
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{
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struct device_d *dev = f->inode;
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return dev_write(dev, buf, size, f->pos, f->flags);
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}
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static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, unsigned long offset)
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{
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struct device_d *dev = f->inode;
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return dev_erase(dev, count, offset);
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}
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static int devfs_protect(struct device_d *_dev, FILE *f, size_t count, unsigned long offset, int prot)
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{
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struct device_d *dev = f->inode;
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return dev_protect(dev, count, offset, prot);
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}
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static int devfs_memmap(struct device_d *_dev, FILE *f, void **map, int flags)
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{
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struct device_d *dev = f->inode;
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return dev_memmap(dev, map, flags);
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}
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static int devfs_open(struct device_d *_dev, FILE *file, const char *filename)
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{
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struct device_d *dev = get_device_by_id(filename + 1);
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if (!dev)
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return -ENOENT;
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file->size = dev->size;
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file->inode = dev;
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return 0;
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}
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static int devfs_close(struct device_d *dev, FILE *f)
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{
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return 0;
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}
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static int devfs_truncate(struct device_d *dev, FILE *f, ulong size)
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{
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if (size > f->dev->size)
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return -ENOSPC;
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return 0;
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}
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static DIR* devfs_opendir(struct device_d *dev, const char *pathname)
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{
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DIR *dir;
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dir = xzalloc(sizeof(DIR));
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if (!list_empty(&device_list))
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dir->priv = list_first_entry(&device_list, struct device_d, list);
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return dir;
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}
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static struct dirent* devfs_readdir(struct device_d *_dev, DIR *dir)
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{
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struct device_d *dev = dir->priv;
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if (!dev)
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return NULL;
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list_for_each_entry_from(dev, &device_list, list) {
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if (!*dev->id)
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continue;
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if (!dev->driver)
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continue;
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strcpy(dir->d.d_name, dev->id);
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dir->priv = list_entry(dev->list.next, struct device_d, list);
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return &dir->d;
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}
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return NULL;
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}
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static int devfs_closedir(struct device_d *dev, DIR *dir)
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{
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free(dir);
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return 0;
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}
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static int devfs_stat(struct device_d *_dev, const char *filename, struct stat *s)
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{
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struct device_d *dev;
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dev = get_device_by_id(filename + 1);
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if (!dev)
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return -ENOENT;
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if (!dev->driver)
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return -ENXIO;
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s->st_mode = S_IFCHR;
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s->st_size = dev->size;
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if (dev->driver->write)
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s->st_mode |= S_IWUSR;
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if (dev->driver->read)
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s->st_mode |= S_IRUSR;
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return 0;
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}
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static int devfs_probe(struct device_d *dev)
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{
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return 0;
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}
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static struct fs_driver_d devfs_driver = {
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.type = FS_TYPE_DEVFS,
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.read = devfs_read,
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.write = devfs_write,
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.open = devfs_open,
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.close = devfs_close,
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.opendir = devfs_opendir,
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.readdir = devfs_readdir,
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.truncate = devfs_truncate,
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.closedir = devfs_closedir,
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.stat = devfs_stat,
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.erase = devfs_erase,
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.protect = devfs_protect,
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.memmap = devfs_memmap,
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.flags = FS_DRIVER_NO_DEV,
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.drv = {
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.type = DEVICE_TYPE_FS,
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.probe = devfs_probe,
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.name = "devfs",
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.type_data = &devfs_driver,
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}
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};
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static int devfs_init(void)
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{
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return register_driver(&devfs_driver.drv);
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}
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device_initcall(devfs_init);
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