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/*
* sysfs_driver.c
*
* Driver utility functions for libsysfs
*
* Copyright (C) IBM Corp. 2003
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
void sysfs_close_drv_dev(void *device)
{
sysfs_close_device((struct sysfs_device *)device);
}
/**
* sysfs_close_driver: closes and cleans up driver structure
* NOTE: This routine does not deallocate devices list
* @driver: driver to close
*/
void sysfs_close_driver(struct sysfs_driver *driver)
{
if (driver != NULL) {
if (driver->devices != NULL) {
dlist_for_each(driver->devices)
dlist_shift(driver->devices);
dlist_destroy(driver->devices);
}
if (driver->directory != NULL)
sysfs_close_directory(driver->directory);
free(driver);
}
}
/**
* sysfs_close_drv: closes driver and deletes device lists too
* @driver: driver to close
*/
void sysfs_close_drv(struct sysfs_driver *driver)
{
if (driver != NULL) {
if (driver->devices != NULL)
dlist_destroy(driver->devices);
if (driver->directory != NULL)
sysfs_close_directory(driver->directory);
free(driver);
}
}
/**
* alloc_driver: allocates and initializes driver
* returns struct sysfs_driver with success and NULL with error.
*/
static struct sysfs_driver *alloc_driver(void)
{
return (struct sysfs_driver *)calloc(1, sizeof(struct sysfs_driver));
}
/**
* sysfs_open_driver: opens and initializes driver structure
* @path: path to driver directory
* returns struct sysfs_driver with success and NULL with error
*/
struct sysfs_driver *sysfs_open_driver(const unsigned char *path)
{
struct sysfs_driver *driver = NULL;
struct sysfs_directory *sdir = NULL;
if (path == NULL) {
errno = EINVAL;
return NULL;
}
sdir = sysfs_open_directory(path);
if (sdir == NULL) {
dprintf("Error opening directory %s\n", path);
return NULL;
}
if ((sysfs_read_directory(sdir)) != 0) {
dprintf("Error reading directory %s\n", path);
sysfs_close_directory(sdir);
return NULL;
}
driver = alloc_driver();
if (driver == NULL) {
dprintf("Error allocating driver at %s\n", path);
sysfs_close_directory(sdir);
return NULL;
}
strcpy(driver->name, sdir->name);
driver->directory = sdir;
strcpy(driver->path, sdir->path);
return driver;
}
/**
* sysfs_get_driver_attributes: gets list of attributes for the given driver
* @driver: sysfs_driver for which attributes are required
* returns a dlist of attributes corresponding to the driver if present
* NULL otherwise
*/
struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver)
{
if (driver == NULL || driver->directory == NULL)
return NULL;
return(driver->directory->attributes);
}
/**
* sysfs_get_driver_links: gets list of links from the given driver
* @driver: sysfs_driver for which links list is required
* returns a dlist of links corresponding to the driver if present
* NULL otherwise
*/
struct dlist *sysfs_get_driver_links(struct sysfs_driver *driver)
{
if (driver == NULL || driver->directory == NULL)
return NULL;
return(driver->directory->links);
}
/**
* sysfs_open_driver_by_name: open a driver by name and return the bus
* the driver is on.
* @drv_name: driver to open
* @bus: the driver bus
* @bsize: size of bus buffer
* NOTE: Need to call sysfs_close_drv to free up memory
* returns struct sysfs_driver if found, NULL otherwise
*/
struct sysfs_driver *sysfs_open_driver_by_name(unsigned char *drv_name,
unsigned char *bus, size_t bsize)
{
struct dlist *buslist = NULL, *drivers = NULL, *devices = NULL;
struct sysfs_driver *driver = NULL;
struct sysfs_device *device = NULL;
struct sysfs_link *curlink = NULL;
char path[SYSFS_PATH_MAX], fullpath[SYSFS_PATH_MAX],
*curbus = NULL, *curdrv = NULL;
if (drv_name == NULL || bus == NULL) {
errno = EINVAL;
return NULL;
}
memset(path, 0, SYSFS_PATH_MAX);
memset(fullpath, 0, SYSFS_PATH_MAX);
buslist = sysfs_open_subsystem_list(SYSFS_BUS_DIR);
if (buslist != NULL) {
dlist_for_each_data(buslist, curbus, char) {
strcpy(path, SYSFS_BUS_DIR);
strcat(path, "/");
strcat(path, curbus);
strcat(path, "/drivers/");
drivers = sysfs_open_subsystem_list(path);
if (drivers != NULL) {
dlist_for_each_data(drivers, curdrv, char) {
if (strcmp(drv_name, curdrv) == 0) {
strncpy(bus, curbus, bsize);
strcat(path, curdrv);
sysfs_close_list(drivers);
sysfs_close_list(buslist);
goto open_device;
}
}
sysfs_close_list(drivers);
}
}
sysfs_close_list(buslist);
return NULL;
}
open_device:
if (sysfs_get_mnt_path(fullpath, SYSFS_PATH_MAX) != 0) {
dprintf("Error getting sysfs mount path\n");
return NULL;
}
strcat(fullpath, path);
driver = sysfs_open_driver(fullpath);
if (driver == NULL) {
dprintf("Driver %s not found\n", drv_name);
return NULL;
}
if (driver->directory->links != NULL) {
dlist_for_each_data(driver->directory->links, curlink,
struct sysfs_link) {
device = sysfs_open_device(curlink->target);
if (device == NULL) {
dprintf("Error opening device at %s\n",
curlink->target);
sysfs_close_drv(driver);
return NULL;
}
strcpy(device->driver_name, drv_name);
if (driver->devices == NULL)
driver->devices = dlist_new_with_delete
(sizeof(struct sysfs_device),
sysfs_close_drv_dev);
dlist_unshift(driver->devices, device);
}
}
return driver;
}
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