532 lines
14 KiB
C
532 lines
14 KiB
C
/*
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* sysfs_class.c
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*
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* Generic class utility functions for libsysfs
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*
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* Copyright (C) IBM Corp. 2003
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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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#include "libsysfs.h"
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#include "sysfs.h"
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void sysfs_close_cls_dev(void *dev)
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{
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sysfs_close_class_device((struct sysfs_class_device *)dev);
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}
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/**
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* class_name_equal: compares class_devices' name
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* @a: class_name looking for
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* @b: sysfs_class_device being compared
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*/
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static int class_name_equal(void *a, void *b)
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{
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if (a == NULL || b == NULL)
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return 0;
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if (strcmp(((unsigned char *)a), ((struct sysfs_class_device *)b)->name)
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== 0)
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return 1;
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return 0;
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}
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/**
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* sysfs_close_class_device: closes a single class device.
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* @dev: class device to close.
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*/
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void sysfs_close_class_device(struct sysfs_class_device *dev)
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{
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if (dev != NULL) {
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if (dev->directory != NULL)
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sysfs_close_directory(dev->directory);
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if (dev->sysdevice != NULL)
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sysfs_close_device(dev->sysdevice);
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if (dev->driver != NULL)
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sysfs_close_driver(dev->driver);
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free(dev);
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}
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}
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/**
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* sysfs_close_class: close single class
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* @class: class structure
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*/
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void sysfs_close_class(struct sysfs_class *cls)
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{
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if (cls != NULL) {
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if (cls->directory != NULL)
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sysfs_close_directory(cls->directory);
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if (cls->devices != NULL)
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dlist_destroy(cls->devices);
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free(cls);
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}
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}
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/**
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* alloc_class_device: mallocs and initializes new class device struct.
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* returns sysfs_class_device or NULL.
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*/
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static struct sysfs_class_device *alloc_class_device(void)
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{
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return (struct sysfs_class_device *)
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calloc(1, sizeof(struct sysfs_class_device));
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}
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/**
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* alloc_class: mallocs new class structure
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* returns sysfs_class struct or NULL
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*/
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static struct sysfs_class *alloc_class(void)
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{
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return (struct sysfs_class *)calloc(1, sizeof(struct sysfs_class));
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}
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/**
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* open_class_dir: opens up sysfs class directory
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* returns sysfs_directory struct with success and NULL with error
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*/
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static struct sysfs_directory *open_class_dir(const unsigned char *name)
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{
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struct sysfs_directory *classdir = NULL;
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unsigned char classpath[SYSFS_PATH_MAX];
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if (name == NULL) {
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errno = EINVAL;
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return NULL;
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}
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memset(classpath, 0, SYSFS_PATH_MAX);
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if ((sysfs_get_mnt_path(classpath, SYSFS_PATH_MAX)) != 0) {
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dprintf("Sysfs not supported on this system\n");
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return NULL;
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}
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strcat(classpath, SYSFS_CLASS_DIR);
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strcat(classpath, "/");
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strcat(classpath, name);
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classdir = sysfs_open_directory(classpath);
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if (classdir == NULL) {
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errno = EINVAL;
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dprintf("Class %s not supported on this system\n", name);
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return NULL;
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}
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if ((sysfs_read_directory(classdir)) != 0) {
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dprintf("Error reading %s class dir %s\n", name, classpath);
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sysfs_close_directory(classdir);
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return NULL;
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}
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return classdir;
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}
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/**
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* sysfs_open_class_device: Opens and populates class device
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* @path: path to class device.
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* returns struct sysfs_class_device with success and NULL with error.
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*/
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struct sysfs_class_device *sysfs_open_class_device(const unsigned char *path)
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{
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struct sysfs_class_device *cdev = NULL;
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struct sysfs_directory *dir = NULL;
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struct sysfs_link *curl = NULL;
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struct sysfs_device *sdev = NULL;
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struct sysfs_driver *drv = NULL;
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if (path == NULL) {
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errno = EINVAL;
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return NULL;
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}
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cdev = alloc_class_device();
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if (cdev == NULL) {
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dprintf("calloc failed\n");
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return NULL;
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}
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if ((sysfs_get_name_from_path(path, cdev->name, SYSFS_NAME_LEN)) != 0) {
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errno = EINVAL;
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dprintf("Invalid class device path %s\n", path);
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sysfs_close_class_device(cdev);
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return NULL;
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}
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dir = sysfs_open_directory(path);
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if (dir == NULL) {
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dprintf("Error opening class device at %s\n", path);
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sysfs_close_class_device(cdev);
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return NULL;
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}
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if ((sysfs_read_directory(dir)) != 0) {
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dprintf("Error reading class device at %s\n", path);
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sysfs_close_directory(dir);
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sysfs_close_class_device(cdev);
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return NULL;
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}
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sysfs_read_all_subdirs(dir);
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cdev->directory = dir;
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strcpy(cdev->path, dir->path);
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/* get driver and device, if implemented */
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if (cdev->directory->links != NULL) {
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dlist_for_each_data(cdev->directory->links, curl,
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struct sysfs_link) {
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if (strncmp(curl->name, SYSFS_DEVICES_NAME, 6) == 0) {
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sdev = sysfs_open_device(curl->target);
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if (sdev != NULL) {
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cdev->sysdevice = sdev;
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if (cdev->driver != NULL)
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strncpy(sdev->driver_name,
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cdev->driver->name,
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SYSFS_NAME_LEN);
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}
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} else if (strncmp(curl->name,
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SYSFS_DRIVERS_NAME, 6) == 0) {
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drv = sysfs_open_driver(curl->target);
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if (drv != NULL) {
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cdev->driver = drv;
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if (cdev->sysdevice != NULL) {
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strncpy(cdev->sysdevice->name,
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drv->name,
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SYSFS_NAME_LEN);
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if (drv->devices == NULL)
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drv->devices =
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dlist_new
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(sizeof(struct
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sysfs_device));
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dlist_unshift(drv->devices,
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cdev->sysdevice);
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}
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}
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}
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}
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}
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return cdev;
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}
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/**
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* get_all_class_devices: gets all devices for class
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* @class: class to get devices for
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* returns 0 with success and -1 with failure
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*/
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static int get_all_class_devices(struct sysfs_class *cls)
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{
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struct sysfs_class_device *dev = NULL;
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struct sysfs_directory *cur = NULL;
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if (cls == NULL || cls->directory == NULL) {
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errno = EINVAL;
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return -1;
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}
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if (cls->directory->subdirs == NULL)
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return 0;
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dlist_for_each_data(cls->directory->subdirs, cur,
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struct sysfs_directory) {
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dev = sysfs_open_class_device(cur->path);
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if (dev == NULL) {
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dprintf("Error opening device at %s\n", cur->path);
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continue;
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}
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if (cls->devices == NULL)
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cls->devices = dlist_new_with_delete
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(sizeof(struct sysfs_class_device),
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sysfs_close_cls_dev);
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dlist_unshift(cls->devices, dev);
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}
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return 0;
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}
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/**
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* sysfs_open_class: opens specific class and all its devices on system
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* returns sysfs_class structure with success or NULL with error.
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*/
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struct sysfs_class *sysfs_open_class(const unsigned char *name)
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{
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struct sysfs_class *cls = NULL;
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struct sysfs_directory *classdir = NULL;
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if (name == NULL) {
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errno = EINVAL;
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return NULL;
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}
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cls = alloc_class();
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if (cls == NULL) {
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dprintf("calloc failed\n");
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return NULL;
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}
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strcpy(cls->name, name);
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classdir = open_class_dir(name);
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if (classdir == NULL) {
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dprintf("Invalid class, %s not supported on this system\n",
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name);
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sysfs_close_class(cls);
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return NULL;
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}
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cls->directory = classdir;
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strcpy(cls->path, classdir->path);
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if ((get_all_class_devices(cls)) != 0) {
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dprintf("Error reading %s class devices\n", name);
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sysfs_close_class(cls);
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return NULL;
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}
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return cls;
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}
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/**
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* sysfs_get_class_device: Get specific class device using the device's id
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* @class: class to find device on
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* @name: class name of the device
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*/
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struct sysfs_class_device *sysfs_get_class_device(struct sysfs_class *class,
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unsigned char *name)
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{
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if (class == NULL || name == NULL) {
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errno = EINVAL;
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return NULL;
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}
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return (struct sysfs_class_device *)dlist_find_custom(class->devices,
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name, class_name_equal);
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}
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/**
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* sysfs_open_class_device_by_name: Locates a specific class_device and returns it.
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* Class_device must be closed using sysfs_close_class_device
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* @classname: Class to search
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* @name: name of the class_device
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*/
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struct sysfs_class_device *sysfs_open_class_device_by_name
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(const unsigned char *classname, unsigned char *name)
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{
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struct sysfs_class *class = NULL;
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struct sysfs_class_device *cdev = NULL, *rcdev = NULL;
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if (classname == NULL || name == NULL) {
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errno = EINVAL;
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return NULL;
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}
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class = sysfs_open_class(classname);
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if (class == NULL) {
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dprintf("Error opening class %s\n", classname);
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return NULL;
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}
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cdev = sysfs_get_class_device(class, name);
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if (cdev == NULL) {
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dprintf("Error getting class device %s from class %s\n",
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name, classname);
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sysfs_close_class(class);
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return NULL;
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}
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rcdev = sysfs_open_class_device(cdev->directory->path);
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if (rcdev == NULL) {
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dprintf("Error getting class device %s from class %s\n",
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name, classname);
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sysfs_close_class(class);
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return NULL;
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}
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sysfs_close_class(class);
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return rcdev;
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}
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/**
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* sysfs_get_classdev_attributes: returns a dlist of attributes for
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* the requested class_device
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* @cdev: sysfs_class_dev for which attributes are needed
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* returns a dlist of attributes if exists, NULL otherwise
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*/
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struct dlist *sysfs_get_classdev_attributes(struct sysfs_class_device *cdev)
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{
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if (cdev == NULL || cdev->directory == NULL)
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return NULL;
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return (cdev->directory->attributes);
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}
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/**
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* sysfs_find_device_class: locates the device the device is on
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* @bus_id: device to look for
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* @classname: buffer to copy class name to
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* @bsize: size of buffer
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* returns 0 with success and -1 with error
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*/
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int sysfs_find_device_class(const unsigned char *bus_id,
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unsigned char *classname, size_t bsize)
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{
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unsigned char class[SYSFS_NAME_LEN], clspath[SYSFS_NAME_LEN];
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unsigned char *cls = NULL, *clsdev = NULL;
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struct dlist *clslist = NULL, *clsdev_list = NULL;
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if (bus_id == NULL || classname == NULL) {
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errno = EINVAL;
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return -1;
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}
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strcpy(class, SYSFS_CLASS_DIR);
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clslist = sysfs_open_subsystem_list(class);
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if (clslist != NULL) {
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dlist_for_each_data(clslist, cls, char) {
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memset(clspath, 0, SYSFS_NAME_LEN);
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strcpy(clspath, SYSFS_CLASS_DIR);
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strcat(clspath, "/");
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strcat(clspath, cls);
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clsdev_list = sysfs_open_subsystem_list(clspath);
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if (clsdev_list != NULL) {
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dlist_for_each_data(clsdev_list,
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clsdev, char) {
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if (strcmp(bus_id, clsdev) == 0) {
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strncpy(classname,
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cls, bsize);
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sysfs_close_list(clsdev_list);
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sysfs_close_list(clslist);
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return 0;
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}
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}
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sysfs_close_list(clsdev_list);
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}
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}
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sysfs_close_list(clslist);
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}
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return -1;
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}
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/**
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* sysfs_get_classdev_attr: searches class device's attributes by name
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* @clsdev: class device to look through
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* @name: attribute name to get
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* returns sysfs_attribute reference with success or NULL with error
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*/
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struct sysfs_attribute *sysfs_get_classdev_attr
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(struct sysfs_class_device *clsdev, const unsigned char *name)
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{
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struct sysfs_attribute *cur = NULL;
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if (clsdev == NULL || clsdev->directory == NULL ||
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clsdev->directory->attributes == NULL || name == NULL) {
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errno = EINVAL;
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return NULL;
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}
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cur = sysfs_get_directory_attribute(clsdev->directory,
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(unsigned char *)name);
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if (cur != NULL)
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return cur;
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return NULL;
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}
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/**
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* sysfs_write_classdev_attr: modify writable attribute value for the given
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* class device
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* @dev: class device name for which the attribute has to be changed
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* @attrib: attribute to change
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* @value: value to change to
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* @len: size of buffer at "value"
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* Returns 0 on success and -1 on error
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*/
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int sysfs_write_classdev_attr(unsigned char *dev, unsigned char *attrib,
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unsigned char *value, size_t len)
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{
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struct sysfs_class_device *clsdev = NULL;
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struct sysfs_attribute *attribute = NULL;
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unsigned char class_name[SYSFS_NAME_LEN];
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if (dev == NULL || attrib == NULL || value == NULL) {
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errno = EINVAL;
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return -1;
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}
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memset(class_name, 0, SYSFS_NAME_LEN);
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if ((sysfs_find_device_class(dev,
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class_name, SYSFS_NAME_LEN)) < 0) {
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dprintf("Class device %s not found\n", dev);
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return -1;
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}
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clsdev = sysfs_open_class_device_by_name(class_name, dev);
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if (clsdev == NULL) {
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dprintf("Error opening %s in class %s\n", dev, class_name);
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return -1;
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}
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attribute = sysfs_get_directory_attribute(clsdev->directory, attrib);
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if (attribute == NULL) {
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dprintf("Attribute %s not defined for device %s on class %s\n",
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attrib, dev, class_name);
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sysfs_close_class_device(clsdev);
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return -1;
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}
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if ((sysfs_write_attribute(attribute, value, len)) < 0) {
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dprintf("Error setting %s to %s\n", attrib, value);
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sysfs_close_class_device(clsdev);
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return -1;
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}
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sysfs_close_class_device(clsdev);
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return 0;
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}
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/**
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* sysfs_read_classdev_attr: read an attribute for a given class device
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* @dev: class device name for which the attribute has to be read
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* @attrib: attribute to read
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* @value: buffer to return value to user
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* @len: size of buffer at "value"
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* Returns 0 on success and -1 on error
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*/
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int sysfs_read_classdev_attr(unsigned char *dev, unsigned char *attrib,
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unsigned char *value, size_t len)
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{
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struct sysfs_class_device *clsdev = NULL;
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struct sysfs_attribute *attribute = NULL;
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unsigned char class_name[SYSFS_NAME_LEN];
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if (dev == NULL || attrib == NULL || value == NULL) {
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errno = EINVAL;
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return -1;
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}
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memset(class_name, 0, SYSFS_NAME_LEN);
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if ((sysfs_find_device_class(dev,
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class_name, SYSFS_NAME_LEN)) < 0) {
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dprintf("Class device %s not found\n", dev);
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return -1;
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}
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clsdev = sysfs_open_class_device_by_name(class_name, dev);
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if (clsdev == NULL) {
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dprintf("Error opening %s in class %s\n", dev, class_name);
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return -1;
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}
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attribute = sysfs_get_directory_attribute(clsdev->directory, attrib);
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if (attribute == NULL) {
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dprintf("Attribute %s not defined for device %s on class %s\n",
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attrib, dev, class_name);
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sysfs_close_class_device(clsdev);
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return -1;
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}
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if (attribute->len > len) {
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dprintf("Value length %d is greater that suppled buffer %d\n",
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attribute->len, len);
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sysfs_close_class_device(clsdev);
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return -1;
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}
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strncpy(value, attribute->value, attribute->len);
|
|
value[(attribute->len)+1] = 0;
|
|
sysfs_close_class_device(clsdev);
|
|
return 0;
|
|
}
|