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 int alpm_activated; 36 37 static void activate_alpm(void) 38 { 39 DIR *dir; 40 struct dirent *dirent; 41 FILE *file; 42 char filename[PATH_MAX]; 43 44 dir = opendir("/sys/class/scsi_host"); 45 if (!dir) 46 return; 47 48 while ((dirent = readdir(dir))) { 49 if (dirent->d_name[0]=='.') 50 continue; 51 sprintf(filename, "/sys/class/scsi_host/%s/link_power_management_policy", dirent->d_name); 52 file = fopen(filename, "w"); 53 if (!file) 54 continue; 55 fprintf(file, "min_power\n"); 56 fclose(file); 57 } 58 59 closedir(dir); 60 alpm_activated = 1; 61 } 62 63 void suggest_sata_alpm(void) 64 { 65 DIR *dir; 66 struct dirent *dirent; 67 FILE *file; 68 char filename[PATH_MAX]; 69 char line[1024]; 70 int need_hint = 0; 71 72 if (alpm_activated) 73 return; 74 75 76 dir = opendir("/sys/class/scsi_host/"); 77 if (!dir) 78 return; 79 80 while ((dirent = readdir(dir))) { 81 if (dirent->d_name[0]=='.') 82 continue; 83 sprintf(filename, "/sys/class/scsi_host/%s/link_power_management_policy", 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 (!strstr(line, "min_power")) 93 need_hint = 1; 94 95 fclose(file); 96 } 97 98 closedir(dir); 99 100 if (need_hint) { 101 add_suggestion(_("Suggestion: Enable SATA ALPM link power management via: \n" 102 " echo min_power > /sys/class/scsi_host/host0/link_power_management_policy\n" 103 "or press the S key."), 104 15, 'S', _(" S - SATA Link Power Management "), activate_alpm); 105 } 106 } 107
