1 /* 2 * Copyright 2007, Intel Corporation 3 * 4 * This file is part of PowerTOP 5 * 6 * This program file is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program in a file named COPYING; if not, write to the 17 * Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301 USA 20 * 21 * Authors: 22 * Arjan van de Ven <arjan (at) linux.intel.com> 23 */ 24 25 #include <unistd.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <stdint.h> 30 #include <sys/types.h> 31 #include <dirent.h> 32 33 #include "powertop.h" 34 35 void activate_usb_autosuspend(void) 36 { 37 DIR *dir; 38 struct dirent *dirent; 39 FILE *file; 40 char filename[PATH_MAX]; 41 42 dir = opendir("/sys/bus/usb/devices"); 43 if (!dir) 44 return; 45 46 while ((dirent = readdir(dir))) { 47 if (dirent->d_name[0]=='.') 48 continue; 49 sprintf(filename, "/sys/bus/usb/devices/%s/power/autosuspend", dirent->d_name); 50 file = fopen(filename, "w"); 51 if (!file) 52 continue; 53 fprintf(file, "0\n"); 54 fclose(file); 55 sprintf(filename, "/sys/bus/usb/devices/%s/power/level", dirent->d_name); 56 file = fopen(filename, "w"); 57 if (!file) 58 continue; 59 fprintf(file, "auto\n"); 60 fclose(file); 61 } 62 63 closedir(dir); 64 } 65 66 void suggest_usb_autosuspend(void) 67 { 68 DIR *dir; 69 struct dirent *dirent; 70 FILE *file; 71 char filename[PATH_MAX]; 72 char line[1024]; 73 int need_hint = 0; 74 75 76 dir = opendir("/sys/bus/usb/devices"); 77 if (!dir) 78 return; 79 80 while ((dirent = readdir(dir))) { 81 if (dirent->d_name[0]=='.') 82 continue; 83 sprintf(filename, "/sys/bus/usb/devices/%s/power/autosuspend", dirent->d_name); 84 file = fopen(filename, "r"); 85 if (!file) 86 continue; 87 memset(line, 0, 1024); 88 if (fgets(line, 1023,file)==NULL) { 89 fclose(file); 90 continue; 91 } 92 if (strtoll(line, NULL,10)<0) 93 need_hint = 1; 94 95 fclose(file); 96 97 98 sprintf(filename, "/sys/bus/usb/devices/%s/power/level", dirent->d_name); 99 file = fopen(filename, "r"); 100 if (!file) 101 continue; 102 memset(line, 0, 1024); 103 if (fgets(line, 1023,file)==NULL) { 104 fclose(file); 105 continue; 106 } 107 if (strstr(line, "on")) 108 need_hint = 1; 109 110 fclose(file); 111 112 113 } 114 115 closedir(dir); 116 117 if (need_hint) { 118 add_suggestion(_("Suggestion: Enable USB autosuspend by pressing the U key or adding \n" 119 "usbcore.autosuspend=1 to the kernel command line in the grub config" 120 ), 121 45, 'U', _(" U - Enable USB suspend "), activate_usb_autosuspend); 122 } 123 } 124 125 126
