1*9c5db199SXin Li /*
2*9c5db199SXin Li * Copyright 2007, Intel Corporation
3*9c5db199SXin Li *
4*9c5db199SXin Li * This file is part of PowerTOP
5*9c5db199SXin Li *
6*9c5db199SXin Li * This program file is free software; you can redistribute it and/or modify it
7*9c5db199SXin Li * under the terms of the GNU General Public License as published by the
8*9c5db199SXin Li * Free Software Foundation; version 2 of the License.
9*9c5db199SXin Li *
10*9c5db199SXin Li * This program is distributed in the hope that it will be useful, but WITHOUT
11*9c5db199SXin Li * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12*9c5db199SXin Li * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13*9c5db199SXin Li * for more details.
14*9c5db199SXin Li *
15*9c5db199SXin Li * You should have received a copy of the GNU General Public License
16*9c5db199SXin Li * along with this program in a file named COPYING; if not, write to the
17*9c5db199SXin Li * Free Software Foundation, Inc.,
18*9c5db199SXin Li * 51 Franklin Street, Fifth Floor,
19*9c5db199SXin Li * Boston, MA 02110-1301 USA
20*9c5db199SXin Li *
21*9c5db199SXin Li * Authors:
22*9c5db199SXin Li * Arjan van de Ven <[email protected]>
23*9c5db199SXin Li */
24*9c5db199SXin Li
25*9c5db199SXin Li #include <unistd.h>
26*9c5db199SXin Li #include <stdio.h>
27*9c5db199SXin Li #include <stdlib.h>
28*9c5db199SXin Li #include <string.h>
29*9c5db199SXin Li #include <stdint.h>
30*9c5db199SXin Li #include <sys/types.h>
31*9c5db199SXin Li #include <dirent.h>
32*9c5db199SXin Li
33*9c5db199SXin Li #include "powertop.h"
34*9c5db199SXin Li
35*9c5db199SXin Li int alpm_activated;
36*9c5db199SXin Li
activate_alpm(void)37*9c5db199SXin Li static void activate_alpm(void)
38*9c5db199SXin Li {
39*9c5db199SXin Li DIR *dir;
40*9c5db199SXin Li struct dirent *dirent;
41*9c5db199SXin Li FILE *file;
42*9c5db199SXin Li char filename[PATH_MAX];
43*9c5db199SXin Li
44*9c5db199SXin Li dir = opendir("/sys/class/scsi_host");
45*9c5db199SXin Li if (!dir)
46*9c5db199SXin Li return;
47*9c5db199SXin Li
48*9c5db199SXin Li while ((dirent = readdir(dir))) {
49*9c5db199SXin Li if (dirent->d_name[0]=='.')
50*9c5db199SXin Li continue;
51*9c5db199SXin Li sprintf(filename, "/sys/class/scsi_host/%s/link_power_management_policy", dirent->d_name);
52*9c5db199SXin Li file = fopen(filename, "w");
53*9c5db199SXin Li if (!file)
54*9c5db199SXin Li continue;
55*9c5db199SXin Li fprintf(file, "min_power\n");
56*9c5db199SXin Li fclose(file);
57*9c5db199SXin Li }
58*9c5db199SXin Li
59*9c5db199SXin Li closedir(dir);
60*9c5db199SXin Li alpm_activated = 1;
61*9c5db199SXin Li }
62*9c5db199SXin Li
suggest_sata_alpm(void)63*9c5db199SXin Li void suggest_sata_alpm(void)
64*9c5db199SXin Li {
65*9c5db199SXin Li DIR *dir;
66*9c5db199SXin Li struct dirent *dirent;
67*9c5db199SXin Li FILE *file;
68*9c5db199SXin Li char filename[PATH_MAX];
69*9c5db199SXin Li char line[1024];
70*9c5db199SXin Li int need_hint = 0;
71*9c5db199SXin Li
72*9c5db199SXin Li if (alpm_activated)
73*9c5db199SXin Li return;
74*9c5db199SXin Li
75*9c5db199SXin Li
76*9c5db199SXin Li dir = opendir("/sys/class/scsi_host/");
77*9c5db199SXin Li if (!dir)
78*9c5db199SXin Li return;
79*9c5db199SXin Li
80*9c5db199SXin Li while ((dirent = readdir(dir))) {
81*9c5db199SXin Li if (dirent->d_name[0]=='.')
82*9c5db199SXin Li continue;
83*9c5db199SXin Li sprintf(filename, "/sys/class/scsi_host/%s/link_power_management_policy", dirent->d_name);
84*9c5db199SXin Li file = fopen(filename, "r");
85*9c5db199SXin Li if (!file)
86*9c5db199SXin Li continue;
87*9c5db199SXin Li memset(line, 0, 1024);
88*9c5db199SXin Li if (fgets(line, 1023,file)==NULL) {
89*9c5db199SXin Li fclose(file);
90*9c5db199SXin Li continue;
91*9c5db199SXin Li }
92*9c5db199SXin Li if (!strstr(line, "min_power"))
93*9c5db199SXin Li need_hint = 1;
94*9c5db199SXin Li
95*9c5db199SXin Li fclose(file);
96*9c5db199SXin Li }
97*9c5db199SXin Li
98*9c5db199SXin Li closedir(dir);
99*9c5db199SXin Li
100*9c5db199SXin Li if (need_hint) {
101*9c5db199SXin Li add_suggestion(_("Suggestion: Enable SATA ALPM link power management via: \n"
102*9c5db199SXin Li " echo min_power > /sys/class/scsi_host/host0/link_power_management_policy\n"
103*9c5db199SXin Li "or press the S key."),
104*9c5db199SXin Li 15, 'S', _(" S - SATA Link Power Management "), activate_alpm);
105*9c5db199SXin Li }
106*9c5db199SXin Li }
107