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/*
* MATE CPUFreq Applet
* Copyright (C) 2004 Carlos Garcia Campos <carlosgc@gnome.org>
*
* This library 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 library 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 library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Authors : Carlos Garc�a Campos <carlosgc@gnome.org>
*/
#include <glib.h>
#include <glib/gstdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "cpufreq-selector-procfs.h"
static void cpufreq_selector_procfs_init (CPUFreqSelectorProcfs *selector);
static void cpufreq_selector_procfs_class_init (CPUFreqSelectorProcfsClass *klass);
static gboolean cpufreq_selector_procfs_set_frequency (CPUFreqSelector *selector,
guint frequency,
GError **error);
static gboolean cpufreq_selector_procfs_set_governor (CPUFreqSelector *selector,
const gchar *governor,
GError **error);
G_DEFINE_TYPE (CPUFreqSelectorProcfs, cpufreq_selector_procfs, CPUFREQ_TYPE_SELECTOR)
static void
cpufreq_selector_procfs_init (CPUFreqSelectorProcfs *selector)
{
}
static void
cpufreq_selector_procfs_class_init (CPUFreqSelectorProcfsClass *klass)
{
CPUFreqSelectorClass *selector_class = CPUFREQ_SELECTOR_CLASS (klass);
selector_class->set_frequency = cpufreq_selector_procfs_set_frequency;
selector_class->set_governor = cpufreq_selector_procfs_set_governor;
}
CPUFreqSelector *
cpufreq_selector_procfs_new (guint cpu)
{
CPUFreqSelector *selector;
selector = CPUFREQ_SELECTOR (g_object_new (CPUFREQ_TYPE_SELECTOR_PROCFS,
"cpu", cpu,
NULL));
return selector;
}
static gboolean
cpufreq_procfs_read (guint selector_cpu,
guint *fmax,
guint *pmin,
guint *pmax,
guint *fmin,
gchar *mode,
GError **error)
{
gchar **lines;
gchar *buffer = NULL;
gint i;
guint cpu;
gboolean found = FALSE;
if (!g_file_get_contents ("/proc/cpufreq", &buffer, NULL, error)) {
return FALSE;
}
lines = g_strsplit (buffer, "\n", -1);
for (i = 0; lines[i]; i++) {
if (g_ascii_strncasecmp (lines[i], "CPU", 3) == 0) {
/* CPU 0 650000 kHz ( 81 %) - 800000 kHz (100 %) - powersave */
sscanf (lines[i], "CPU %u %u kHz (%u %%) - %u kHz (%u %%) - %20s",
&cpu, fmin, pmin, fmax, pmax, mode);
if (cpu == selector_cpu) {
found = TRUE;
break;
}
}
}
g_strfreev (lines);
g_free (buffer);
if (!found) {
g_set_error (error,
CPUFREQ_SELECTOR_ERROR,
SELECTOR_ERROR_INVALID_CPU,
"Invalid CPU number '%d'",
selector_cpu);
return FALSE;
}
return TRUE;
}
static gboolean
cpufreq_procfs_write (const gchar *path,
const gchar *setting,
GError **error)
{
FILE *fd;
fd = g_fopen (path, "w");
if (!fd) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
"Failed to open '%s' for writing: "
"g_fopen() failed: %s",
path,
g_strerror (errno));
return FALSE;
}
if (g_fprintf (fd, "%s", setting) < 0) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
"Failed to write '%s': "
"g_fprintf() failed: %s",
path,
g_strerror (errno));
fclose (fd);
return FALSE;
}
fclose (fd);
return TRUE;
}
static gboolean
cpufreq_selector_procfs_set_frequency (CPUFreqSelector *selector,
guint frequency,
GError **error)
{
gchar *str;
gchar *path;
guint freq;
guint cpu;
guint pmin, pmax;
guint sc_max, sc_min;
gchar mode[21];
g_object_get (G_OBJECT (selector),
"cpu", &cpu,
NULL);
if (!cpufreq_procfs_read (cpu, &sc_max, &pmin, &pmax, &sc_min, mode, error)) {
return FALSE;
}
if (g_ascii_strcasecmp (mode, "userspace") != 0) {
if (!cpufreq_selector_procfs_set_governor (selector,
"userspace",
error)) {
return FALSE;
}
}
if (frequency != sc_max && frequency != sc_min) {
if (abs (sc_max - frequency) < abs (frequency - sc_min))
freq = sc_max;
else
freq = sc_min;
} else {
freq = frequency;
}
path = g_strdup_printf ("/proc/sys/cpu/%u/speed", cpu);
str = g_strdup_printf ("%u", freq);
if (!cpufreq_procfs_write (path, str, error)) {
g_free (path);
g_free (str);
return FALSE;
}
g_free (path);
g_free (str);
return TRUE;
}
static gboolean
cpufreq_selector_procfs_set_governor (CPUFreqSelector *selector,
const gchar *governor,
GError **error)
{
gchar *str;
guint cpu;
guint pmin, pmax;
guint sc_max, sc_min;
gchar mode[21];
g_object_get (G_OBJECT (selector),
"cpu", &cpu,
NULL);
if (!cpufreq_procfs_read (cpu, &sc_max, &pmin, &pmax, &sc_min, mode, error)) {
return FALSE;
}
if (g_ascii_strcasecmp (governor, mode) == 0)
return TRUE;
str = g_strdup_printf ("%u:%u:%u:%s", cpu, sc_min, sc_max, governor);
if (!cpufreq_procfs_write ("/proc/cpufreq", str, error)) {
g_free (str);
return FALSE;
}
g_free (str);
return TRUE;
}
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