usr/sysfs.h

   1 /*
   2  * This is from udev-121 udev.h
   3  *
   4  * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
   5  * Copyright (C) 2003-2006 Kay Sievers <kay.sievers@vrfy.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify it
   8  *      under the terms of the GNU General Public License as published by the
   9  *      Free Software Foundation version 2 of the License.
  10  *
  11  *      This program is distributed in the hope that it will be useful, but
  12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *      General Public License for more details.
  15  *
  16  *      You should have received a copy of the GNU General Public License along
  17  *      with this program; if not, write to the Free Software Foundation, Inc.,
  18  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  *
  20  */
  21
  22 #ifndef _SYSFS_
  23 #define _SYSFS_
  24
  25 #include <stdint.h>
  26 #include "list.h"
  27 #include "string.h"
  28
  29 #define PATH_SIZE                               512
  30 #define NAME_SIZE                               256
  31
  32 struct sysfs_device {
  33         struct list_head node;                  /* for device cache */
  34         struct sysfs_device *parent;            /* already cached parent*/
  35         char devpath[PATH_SIZE];
  36         char subsystem[NAME_SIZE];              /* $class, $bus, drivers, module */
  37         char kernel[NAME_SIZE];                 /* device instance name */
  38         char kernel_number[NAME_SIZE];
  39         char driver[NAME_SIZE];                 /* device driver name */
  40 };
  41
  42 extern char sysfs_path[PATH_SIZE];
  43 extern int sysfs_init(void);
  44 extern void sysfs_cleanup(void);
  45 extern void sysfs_device_set_values(struct sysfs_device *dev, const char *devpath,
  46                                     const char *subsystem, const char *driver);
  47 extern struct sysfs_device *sysfs_device_get(const char *devpath);
  48 extern struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev);
  49 extern struct sysfs_device *sysfs_device_get_parent_with_subsystem(struct sysfs_device *dev, const char *subsystem);
  50 extern char *sysfs_attr_get_value(const char *devpath, const char *attr_name);
  51 extern int sysfs_resolve_link(char *path, size_t size);
  52 extern int sysfs_lookup_devpath_by_subsys_id(char *devpath, size_t len, const char *subsystem, const char *id);
  53
  54 extern char *sysfs_get_value(const char *id, char *subsys, char *param);
  55 extern int sysfs_get_uint(char *id, char *subsys, char *param,
  56                           unsigned int *value);
  57 extern int sysfs_get_int(const char *id, char *subsys, char *param, int *value);
  58 extern int sysfs_get_str(char *id, char *subsys, char *param, char *value,
  59                          int value_size);
  60 extern int sysfs_get_uint64(char *id, char *subsys, char *param,
  61                             uint64_t *value);
  62 extern int sysfs_set_param(char *id, char *subsys, char *attr_name,
  63                            char *write_buf, ssize_t buf_size);
  64
  65 #endif