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@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 /* static arrays are not nice programming.. but they're easy */
36 static char configlines[5000][100];
37 static int configcount;
38
read_kernel_config(void)39 static void read_kernel_config(void)
40 {
41 FILE *file;
42 char version[100], *c;
43 char filename[100];
44 if (configcount)
45 return;
46 if (access("/proc/config.gz", R_OK) == 0) {
47 file = popen("zcat /proc/config.gz 2> /dev/null", "r");
48 while (file && !feof(file)) {
49 char line[100];
50 if (fgets(line, 100, file) == NULL)
51 break;
52 strcpy(configlines[configcount++], line);
53 }
54 pclose(file);
55 return;
56 }
57 file = fopen("/proc/sys/kernel/osrelease", "r");
58 if (!file)
59 return;
60 if (fgets(version, 100, file) == NULL) {
61 fclose(file);
62 return;
63 }
64 fclose(file);
65 c = strchr(version, '\n');
66 if (c)
67 *c = 0;
68 sprintf(filename, "/boot/config-%s", version);
69 file = fopen(filename, "r");
70 if (!file) {
71 sprintf(filename, "/lib/modules/%s/build/.config", version);
72 file = fopen(filename, "r");
73 }
74 if (!file)
75 return;
76 while (!feof(file)) {
77 char line[100];
78 if (fgets(line, 100, file) == NULL)
79 break;
80 strcpy(configlines[configcount++], line);
81 }
82 fclose(file);
83 }
84
85 /*
86 * Suggest the user to turn on/off a kernel config option.
87 * "comment" gets displayed if it's not already set to the right value
88 */
suggest_kernel_config(char * string,int onoff,char * comment,int weight)89 void suggest_kernel_config(char *string, int onoff, char *comment, int weight)
90 {
91 int i;
92 char searchon[100];
93 char searchoff[100];
94 int found = 0;
95
96 read_kernel_config();
97
98 sprintf(searchon, "%s=", string);
99 sprintf(searchoff, "# %s is not set", string);
100
101 for (i = 0; i < configcount; i++) {
102 if (onoff && strstr(configlines[i], searchon))
103 return;
104 if (onoff==0 && strstr(configlines[i], searchoff))
105 return;
106 if (onoff==0 && strstr(configlines[i], searchon))
107 found = 1;
108 }
109 if (onoff || found)
110 add_suggestion(comment, weight, 0, NULL, NULL);
111 fflush(stdout);
112 }
113