Because that's what it is. 'inode' will become confusing once we support real inodes. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
268 lines
5.4 KiB
C
268 lines
5.4 KiB
C
/*
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* devfs.c - a device file system for barebox
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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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*/
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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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#include <ioctl.h>
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#include <nand.h>
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#include <linux/err.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/mtd-abi.h>
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#include <partition.h>
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extern struct list_head cdev_list;
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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 cdev *cdev = f->priv;
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return cdev_read(cdev, 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 cdev *cdev = f->priv;
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if (cdev->flags & DEVFS_PARTITION_READONLY)
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return -EPERM;
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return cdev_write(cdev, buf, size, f->pos, f->flags);
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}
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static loff_t devfs_lseek(struct device_d *_dev, FILE *f, loff_t pos)
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{
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struct cdev *cdev = f->priv;
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loff_t ret = -1;
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if (cdev->ops->lseek)
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ret = cdev->ops->lseek(cdev, pos + cdev->offset);
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if (ret != -1)
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f->pos = pos;
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return ret - cdev->offset;
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}
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static int devfs_erase(struct device_d *_dev, FILE *f, size_t count, loff_t offset)
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{
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struct cdev *cdev = f->priv;
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if (cdev->flags & DEVFS_PARTITION_READONLY)
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return -EPERM;
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if (!cdev->ops->erase)
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return -ENOSYS;
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if (count + offset > cdev->size)
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count = cdev->size - offset;
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return cdev->ops->erase(cdev, count, offset + cdev->offset);
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}
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static int devfs_protect(struct device_d *_dev, FILE *f, size_t count, loff_t offset, int prot)
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{
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struct cdev *cdev = f->priv;
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if (!cdev->ops->protect)
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return -ENOSYS;
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return cdev->ops->protect(cdev, count, offset + cdev->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 cdev *cdev = f->priv;
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int ret = -ENOSYS;
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if (!cdev->ops->memmap)
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return -EINVAL;
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ret = cdev->ops->memmap(cdev, map, flags);
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if (!ret)
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*map = (void *)((unsigned long)*map + (unsigned long)cdev->offset);
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return ret;
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}
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static int devfs_open(struct device_d *_dev, FILE *f, const char *filename)
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{
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struct cdev *cdev;
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int ret;
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cdev = cdev_by_name(filename + 1);
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if (!cdev)
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return -ENOENT;
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f->size = cdev->flags & DEVFS_IS_CHARACTER_DEV ?
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FILE_SIZE_STREAM : cdev->size;
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f->priv = cdev;
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if (cdev->ops->open) {
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ret = cdev->ops->open(cdev, f->flags);
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if (ret)
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return ret;
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}
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cdev->open++;
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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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struct cdev *cdev = f->priv;
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int ret;
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if (cdev->ops->close) {
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ret = cdev->ops->close(cdev);
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if (ret)
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return ret;
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}
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cdev->open--;
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return 0;
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}
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static int devfs_flush(struct device_d *_dev, FILE *f)
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{
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struct cdev *cdev = f->priv;
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if (cdev->ops->flush)
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return cdev->ops->flush(cdev);
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return 0;
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}
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static int devfs_ioctl(struct device_d *_dev, FILE *f, int request, void *buf)
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{
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struct cdev *cdev = f->priv;
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return cdev_ioctl(cdev, request, buf);
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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 (f->fsdev->dev.num_resources < 1)
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return -ENOSPC;
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if (size > resource_size(&f->fsdev->dev.resource[0]))
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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(&cdev_list))
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dir->priv = list_first_entry(&cdev_list, struct cdev, 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 cdev *cdev = dir->priv;
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if (!cdev)
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return NULL;
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list_for_each_entry_from(cdev, &cdev_list, list) {
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strcpy(dir->d.d_name, cdev->name);
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dir->priv = list_entry(cdev->list.next, struct cdev, 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 cdev *cdev;
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cdev = cdev_by_name(filename + 1);
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if (!cdev)
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return -ENOENT;
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s->st_mode = S_IFCHR;
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s->st_size = cdev->size;
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if (cdev->ops->write)
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s->st_mode |= S_IWUSR;
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if (cdev->ops->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 void devfs_delete(struct device_d *dev)
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{
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}
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static struct fs_driver_d devfs_driver = {
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.read = devfs_read,
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.write = devfs_write,
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.lseek = devfs_lseek,
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.open = devfs_open,
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.close = devfs_close,
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.flush = devfs_flush,
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.ioctl = devfs_ioctl,
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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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.probe = devfs_probe,
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.remove = devfs_delete,
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.name = "devfs",
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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_fs_driver(&devfs_driver);
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}
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coredevice_initcall(devfs_init);
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