File: libsys_pmu.c

package info (click to toggle)
cpufreqd 1.2.3-2
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 1,648 kB
  • ctags: 210
  • sloc: sh: 8,665; ansic: 1,648; makefile: 120
file content (190 lines) | stat: -rw-r--r-- 4,265 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
 *  Copyright (C) 2003,2004  Rene Rebe <rene@rocklinux.org>
 *
 *  This program 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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Based upon the acpi version:
 *    Copyright (C) 2002,2003,2004  Mattia Dongili<dongili@supereva.it>
 *                                  George Staikos <staikos@0wned.org>
 */
#include "libsys.h"

int tokenize (FILE *fp, char *t, char *v);
  
char info_file[255];
char bat_file[255];
char tag[255];
char val[255];
char version[101];
int bat_num = 0;
static int err = 0;

int tokenize (FILE *fp, char *t, char *v) {
  char str[255];
  char *s1, *s2;

  t[0] = v[0] = 0;

  if (fgets(str, 255, fp) == NULL)
    return EOF;

  if ((s1 = strtok(str, ":")) == NULL)
    return 0;

  s2 = s1 + strlen (s1) - 1;
  /* remove trailing spaces */
  for ( ; s1 != s2 ; --s2)
    if ( *s2 != ' ')
      break;
    else
      *s2 = 0;
  strncpy (t, s1, 255);
  t[254] = 0;

  if ((s1 = strtok(NULL, ":")) == NULL)
    return 0;

  for ( ; *s1 != 0 ; ++s1)
    if ( *s1 != ' ')
      break;

  strncpy (v, s1, 255);
  v[254] = 0;

  return 1;
}

/* void libsys_init(void)
 *
 * Initialize local variables.
 */
int libsys_init(void) {
  
  FILE *fp;

  snprintf(info_file, 255, "%s/info", PMU_PROC_DIR);
  snprintf(bat_file, 255, "%s/battery_0", PMU_PROC_DIR); 
 
  fp = fopen(info_file, "r");
  if (!fp) {
    cp_log(LOG_ERR, "libsys_init(): %s: %s\n", info_file, strerror(errno));
    err++;
    return -1;
  }

  while (tokenize(fp, tag, val) != EOF) {

    if (strcmp (tag, "PMU driver version") == 0) {
      sprintf (version, "%s - ", val);
    } 
    else if (strcmp (tag, "PMU firmware version") == 0) {
      strncat (version, val, 100-strlen(version));
    }
  } 
  fclose(fp);

  cp_log(LOG_NOTICE, "libsys_init(): PMU driver/firmware version %s\n", version);

  return 0;
}

/* void libsys_fini (void)
 *
 * Free allocated structures.
 */

void libsys_fini (void) {}

/* int scan_system_info(sys_info *s) 
 *
 * Reads PMU info and fills the input sys_info struct.
 * Implements the prototype needed by cpufreqd to get
 * info from the PM layer.
 * 
 * Returns 0 on success, -1 otherwise
 *
 */
int scan_system_info(sys_info *s) {

  FILE *fp;

  float bat_charge = .0;
  float bat_max_charge = .0;
  
  /* check if _init was successful */
  if (err>0)
    return -1;
  
  /* set version information */
  strncpy(s->version, version, 101);
  s->version[100] = 0;
 
  /** /proc/pmu/info **/
  fp = fopen(info_file, "r");
  if (!fp) {
    cp_log(LOG_ERR, "libsys_init(): %s: %s\n", info_file, strerror(errno));
    err++;
    return -1;
  }

  while (tokenize(fp, tag, val) != EOF) {

    if (strcmp (tag, "AC Power") == 0) {
      s->ac = atoi (val); 
    }
    else if (strcmp (tag, "Battery count") == 0) {
      s->has_battery = atoi (val); 
    }
  }
  fclose(fp);

 
  /** /proc/pmu/battery_0 **/
  fp = fopen(bat_file, "r");
  if (!fp) {
    cp_log(LOG_ERR, "scan_system_info(): %s: %s\n", bat_file, strerror(errno));
    return -1;
  }

  while (tokenize(fp, tag, val) != EOF) {
    if (strcmp (tag, "charge") == 0) {
      bat_charge = atof (val); 
    }
    else if (strcmp (tag, "max_charge") == 0) {
      bat_max_charge = atof (val);
    }
  }
  fclose(fp);

  s->battery_percent = 100 * (bat_charge / bat_max_charge);

  cp_log(LOG_INFO, "scan_system_info(): battery %s - %d - %s\n",
                    s->has_battery?"present":"absent", 
                    s->battery_percent, 
                    s->ac?"on-line":"off-line");
  return 0;
}

#ifdef DEBUG_PMU
int main ()
{
  sys_info info;

  libsys_init();
  scan_system_info (&info);
  return 0;
}
#endif