/* * Copyright 2007, Intel Corporation * * This file is part of PowerTOP * * This program file is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; version 2 of the License. * * This program 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 General Public License * for more details. * * You should have received a copy of the GNU General Public License * along with this program in a file named COPYING; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, * Boston, MA 02110-1301 USA * * Authors: * Arjan van de Ven <arjan@linux.intel.com> */ #include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #include <sys/types.h> #include <dirent.h> #include "powertop.h" void activate_usb_autosuspend(void) { DIR *dir; struct dirent *dirent; FILE *file; char filename[PATH_MAX]; dir = opendir("/sys/bus/usb/devices"); if (!dir) return; while ((dirent = readdir(dir))) { if (dirent->d_name[0]=='.') continue; sprintf(filename, "/sys/bus/usb/devices/%s/power/autosuspend", dirent->d_name); file = fopen(filename, "w"); if (!file) continue; fprintf(file, "0\n"); fclose(file); sprintf(filename, "/sys/bus/usb/devices/%s/power/level", dirent->d_name); file = fopen(filename, "w"); if (!file) continue; fprintf(file, "auto\n"); fclose(file); } closedir(dir); } void suggest_usb_autosuspend(void) { DIR *dir; struct dirent *dirent; FILE *file; char filename[PATH_MAX]; char line[1024]; int need_hint = 0; dir = opendir("/sys/bus/usb/devices"); if (!dir) return; while ((dirent = readdir(dir))) { if (dirent->d_name[0]=='.') continue; sprintf(filename, "/sys/bus/usb/devices/%s/power/autosuspend", dirent->d_name); file = fopen(filename, "r"); if (!file) continue; memset(line, 0, 1024); if (fgets(line, 1023,file)==NULL) { fclose(file); continue; } if (strtoll(line, NULL,10)<0) need_hint = 1; fclose(file); sprintf(filename, "/sys/bus/usb/devices/%s/power/level", dirent->d_name); file = fopen(filename, "r"); if (!file) continue; memset(line, 0, 1024); if (fgets(line, 1023,file)==NULL) { fclose(file); continue; } if (strstr(line, "on")) need_hint = 1; fclose(file); } closedir(dir); if (need_hint) { add_suggestion(_("Suggestion: Enable USB autosuspend by pressing the U key or adding \n" "usbcore.autosuspend=1 to the kernel command line in the grub config" ), 45, 'U', _(" U - Enable USB suspend "), activate_usb_autosuspend); } }