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/*
* devfs.c - a device file system for barebox
*
* Copyright (c) 2011 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 <errno.h>
#include <malloc.h>
#include <ioctl.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
LIST_HEAD(cdev_list);
struct cdev *cdev_by_name(const char *filename)
{
struct cdev *cdev;
list_for_each_entry(cdev, &cdev_list, list) {
if (!strcmp(cdev->name, filename))
return cdev;
}
return NULL;
}
struct cdev *cdev_open(const char *name, unsigned long flags)
{
struct cdev *cdev = cdev_by_name(name);
int ret;
if (!cdev)
return NULL;
if (cdev->ops->open) {
ret = cdev->ops->open(cdev);
if (ret)
return NULL;
}
return cdev;
}
void cdev_close(struct cdev *cdev)
{
if (cdev->ops->close)
cdev->ops->close(cdev);
}
ssize_t cdev_read(struct cdev *cdev, void *buf, size_t count, ulong offset, ulong flags)
{
if (!cdev->ops->read)
return -ENOSYS;
return cdev->ops->read(cdev, buf, count, cdev->offset +offset, flags);
}
ssize_t cdev_write(struct cdev *cdev, const void *buf, size_t count, ulong offset, ulong flags)
{
if (!cdev->ops->write)
return -ENOSYS;
return cdev->ops->write(cdev, buf, count, cdev->offset + offset, flags);
}
int cdev_flush(struct cdev *cdev)
{
if (!cdev->ops->flush)
return 0;
return cdev->ops->flush(cdev);
}
static int partition_ioctl(struct cdev *cdev, int request, void *buf)
{
size_t offset;
struct mtd_info_user *user = buf;
switch (request) {
case MEMSETBADBLOCK:
case MEMGETBADBLOCK:
offset = (off_t)buf;
offset += cdev->offset;
return cdev->ops->ioctl(cdev, request, (void *)offset);
case MEMGETINFO:
if (cdev->mtd) {
user->type = cdev->mtd->type;
user->flags = cdev->mtd->flags;
user->size = cdev->mtd->size;
user->erasesize = cdev->mtd->erasesize;
user->oobsize = cdev->mtd->oobsize;
user->mtd = cdev->mtd;
/* The below fields are obsolete */
user->ecctype = -1;
user->eccsize = 0;
return 0;
}
if (!cdev->ops->ioctl)
return -EINVAL;
return cdev->ops->ioctl(cdev, request, buf);
default:
return -EINVAL;
}
}
int cdev_ioctl(struct cdev *cdev, int request, void *buf)
{
if (cdev->flags & DEVFS_IS_PARTITION)
return partition_ioctl(cdev, request, buf);
if (!cdev->ops->ioctl)
return -EINVAL;
return cdev->ops->ioctl(cdev, request, buf);
}
int cdev_erase(struct cdev *cdev, size_t count, unsigned long offset)
{
if (!cdev->ops->erase)
return -ENOSYS;
return cdev->ops->erase(cdev, count, cdev->offset + offset);
}
int devfs_create(struct cdev *new)
{
struct cdev *cdev;
cdev = cdev_by_name(new->name);
if (cdev)
return -EEXIST;
list_add_tail(&new->list, &cdev_list);
if (new->dev)
list_add_tail(&new->devices_list, &new->dev->cdevs);
return 0;
}
int devfs_remove(struct cdev *cdev)
{
if (cdev->open)
return -EBUSY;
list_del(&cdev->list);
if (cdev->dev)
list_del(&cdev->devices_list);
return 0;
}
int devfs_add_partition(const char *devname, unsigned long offset, size_t size,
int flags, const char *name)
{
struct cdev *cdev, *new;
cdev = cdev_by_name(name);
if (cdev)
return -EEXIST;
cdev = cdev_by_name(devname);
if (!cdev)
return -ENOENT;
if (offset + size > cdev->size)
return -EINVAL;
new = xzalloc(sizeof (*new));
new->name = strdup(name);
new->ops = cdev->ops;
new->priv = cdev->priv;
new->size = size;
new->offset = offset + cdev->offset;
new->dev = cdev->dev;
new->flags = flags | DEVFS_IS_PARTITION;
#ifdef CONFIG_PARTITION_NEED_MTD
if (cdev->mtd) {
new->mtd = mtd_add_partition(cdev->mtd, offset, size, flags, name);
if (IS_ERR(new->mtd)) {
int ret = PTR_ERR(new->mtd);
free(new);
return ret;
}
}
#endif
devfs_create(new);
return 0;
}
int devfs_del_partition(const char *name)
{
struct cdev *cdev;
int ret;
cdev = cdev_by_name(name);
if (!cdev)
return -ENOENT;
if (!(cdev->flags & DEVFS_IS_PARTITION))
return -EINVAL;
if (cdev->flags & DEVFS_PARTITION_FIXED)
return -EPERM;
#ifdef CONFIG_PARTITION_NEED_MTD
if (cdev->mtd)
mtd_del_partition(cdev->mtd);
#endif
ret = devfs_remove(cdev);
if (ret)
return ret;
free(cdev->name);
free(cdev);
return 0;
}
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