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