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/*
* libsysfs.h
*
* Header Definitions for libsysfs
*
* Copyright (C) IBM Corp. 2004-2005
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _LIBSYSFS_H_
#define _LIBSYSFS_H_
#include <sys/types.h>
#include <string.h>
#include "dlist.h"
#define SYSFS_FSTYPE_NAME "sysfs"
#define SYSFS_PROC_MNTS "/proc/mounts"
#define SYSFS_BUS_NAME "bus"
#define SYSFS_CLASS_NAME "class"
#define SYSFS_BLOCK_NAME "block"
#define SYSFS_DEVICES_NAME "devices"
#define SYSFS_DRIVERS_NAME "drivers"
#define SYSFS_MODULE_NAME "module"
#define SYSFS_NAME_ATTRIBUTE "name"
#define SYSFS_UNKNOWN "unknown"
#define SYSFS_PATH_ENV "SYSFS_PATH"
#define SYSFS_PATH_MAX 256
#define SYSFS_NAME_LEN 64
#define SYSFS_BUS_ID_SIZE 32
/* mount path for sysfs, can be overridden by exporting SYSFS_PATH */
#define SYSFS_MNT_PATH "/sys"
enum sysfs_attribute_method {
SYSFS_METHOD_SHOW = 0x01, /* attr can be read by user */
SYSFS_METHOD_STORE = 0x02, /* attr can be changed by user */
};
/*
* NOTE:
* 1. We have the statically allocated "name" as the first element of all
* the structures. This feature is used in the "sorter" function for dlists
* 2. As is the case with attrlist
* 3. As is the case with path
*/
struct sysfs_attribute {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
char *value;
unsigned short len; /* value length */
enum sysfs_attribute_method method; /* show and store */
};
struct sysfs_driver {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
struct dlist *attrlist;
char bus[SYSFS_NAME_LEN];
/* Private: for internal use only */
struct dlist *devices;
};
struct sysfs_device {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
struct dlist *attrlist;
char bus_id[SYSFS_NAME_LEN];
char bus[SYSFS_NAME_LEN];
char driver_name[SYSFS_NAME_LEN];
/* Private: for internal use only */
struct sysfs_device *parent;
/* NOTE - we still don't populate this */
struct dlist *children;
};
/* NOTE: not used as of now */
struct sysfs_bus {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
struct dlist *attrlist;
/* Private: for internal use only */
struct dlist *drivers;
struct dlist *devices;
};
struct sysfs_class_device {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
struct dlist *attrlist;
char classname[SYSFS_NAME_LEN];
/* Private: for internal use only */
struct sysfs_class_device *parent;
struct sysfs_device *sysdevice; /* NULL if virtual */
};
/* NOTE: not used as of now */
struct sysfs_class {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
struct dlist *attrlist;
/* Private: for internal use only */
struct dlist *devices;
};
#ifdef __cplusplus
extern "C" {
#endif
/*
* Function Prototypes
*/
extern int sysfs_get_mnt_path(char *mnt_path, size_t len);
extern int sysfs_remove_trailing_slash(char *path);
extern int sysfs_get_name_from_path(const char *path, char *name, size_t len);
extern int sysfs_path_is_dir(const char *path);
extern int sysfs_path_is_link(const char *path);
extern int sysfs_path_is_file(const char *path);
extern int sysfs_get_link(const char *path, char *target, size_t len);
extern struct dlist *sysfs_open_directory_list(const char *path);
extern void sysfs_close_list(struct dlist *list);
/* sysfs directory and file access */
extern void sysfs_close_attribute(struct sysfs_attribute *sysattr);
extern struct sysfs_attribute *sysfs_open_attribute(const char *path);
extern int sysfs_read_attribute(struct sysfs_attribute *sysattr);
extern int sysfs_write_attribute(struct sysfs_attribute *sysattr,
const char *new_value, size_t len);
/* sysfs driver access */
extern void sysfs_close_driver(struct sysfs_driver *driver);
extern struct sysfs_driver *sysfs_open_driver
(const char *bus_name, const char *drv_name);
extern struct sysfs_driver *sysfs_open_driver_path(const char *path);
extern struct sysfs_attribute *sysfs_get_driver_attr
(struct sysfs_driver *drv, const char *name);
extern struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver);
extern struct dlist *sysfs_get_driver_devices(struct sysfs_driver *driver);
/* generic sysfs device access */
extern void sysfs_close_device_tree(struct sysfs_device *device);
extern struct sysfs_device *sysfs_open_device_tree(const char *path);
extern void sysfs_close_device(struct sysfs_device *dev);
extern struct sysfs_device *sysfs_open_device
(const char *bus, const char *bus_id);
extern struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev);
extern struct sysfs_device *sysfs_open_device_path(const char *path);
extern int sysfs_get_device_bus(struct sysfs_device *dev);
extern struct sysfs_attribute *sysfs_get_device_attr
(struct sysfs_device *dev, const char *name);
extern struct dlist *sysfs_get_device_attributes
(struct sysfs_device *dev);
/* generic sysfs class access */
extern void sysfs_close_class_device(struct sysfs_class_device *dev);
extern struct sysfs_class_device *sysfs_open_class_device_path
(const char *path);
extern struct sysfs_class_device *sysfs_open_class_device
(const char *classname, const char *name);
extern struct sysfs_class_device *sysfs_get_classdev_parent
(struct sysfs_class_device *clsdev);
extern struct sysfs_attribute *sysfs_get_classdev_attr
(struct sysfs_class_device *clsdev, const char *name);
extern struct dlist *sysfs_get_classdev_attributes
(struct sysfs_class_device *clsdev);
extern struct sysfs_device *sysfs_get_classdev_device
(struct sysfs_class_device *clsdev);
/**
* sort_list: sorter function to keep list elements sorted in alphabetical
* order. Just does a strncmp as you can see :)
*
* Returns 1 if less than 0 otherwise
*
* NOTE: We take care to have a statically allocated "name" as the first
* lement of all libsysfs structures. Hence, this function will work
* AS IS for _ALL_ the lists that have to be sorted.
*/
static inline int sort_list(void *new_elem, void *old_elem)
{
return ((strncmp(((struct sysfs_attribute *)new_elem)->name,
((struct sysfs_attribute *)old_elem)->name,
strlen(((struct sysfs_attribute *)new_elem)->name))) < 0 ? 1 : 0);
}
#ifdef __cplusplus
}
#endif
#endif /* _LIBSYSFS_H_ */
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