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path: root/cpufreq/src/cpufreq-monitor-procfs.c
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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/gi18n.h>

#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "cpufreq-monitor-procfs.h"
#include "cpufreq-utils.h"

static gboolean cpufreq_monitor_procfs_run                       (CPUFreqMonitor       *monitor);
static GList   *cpufreq_monitor_procfs_get_available_frequencies (CPUFreqMonitor       *monitor);

G_DEFINE_TYPE (CPUFreqMonitorProcfs, cpufreq_monitor_procfs, CPUFREQ_TYPE_MONITOR)

static void
cpufreq_monitor_procfs_init (CPUFreqMonitorProcfs *monitor)
{
}

static void
cpufreq_monitor_procfs_class_init (CPUFreqMonitorProcfsClass *klass)
{
    CPUFreqMonitorClass *monitor_class = CPUFREQ_MONITOR_CLASS (klass);

    monitor_class->run = cpufreq_monitor_procfs_run;
    monitor_class->get_available_frequencies = cpufreq_monitor_procfs_get_available_frequencies;
}

CPUFreqMonitor *
cpufreq_monitor_procfs_new (guint cpu)
{
    CPUFreqMonitorProcfs *monitor;

    monitor = g_object_new (TYPE_CPUFREQ_MONITOR_PROCFS, "cpu", cpu, NULL);

    return CPUFREQ_MONITOR (monitor);
}

static gint
cpufreq_monitor_procfs_get_freq_from_userspace (guint cpu)
{
    gchar  *buffer = NULL;
    gchar  *path;
    gchar  *p;
    gchar  *frequency;
    gint    freq;
    gint    len;
    GError *error = NULL;

    path = g_strdup_printf ("/proc/sys/cpu/%u/speed", cpu);

    if (!cpufreq_file_get_contents (path, &buffer, NULL, &error)) {
        g_warning ("%s", error->message);
        g_error_free (error);

        g_free (path);

        return -1;
    }

    g_free (path);

    /* Try to remove the '\n' */
    p = g_strrstr (buffer, "\n");
    len = strlen (buffer);
    if (p)
        len -= strlen (p);

    frequency = g_strndup (buffer, len);
    g_free (buffer);

    freq = atoi (frequency);
    g_free (frequency);

    return freq;
}

static gboolean
cpufreq_monitor_procfs_parse (CPUFreqMonitorProcfs *monitor,
                              gint                 *cpu,
                              gint                 *fmax,
                              gint                 *pmin,
                              gint                 *pmax,
                              gint                 *fmin,
                              gchar                *mode)
{
    gchar **lines;
    gchar  *buffer = NULL;
    gint    i, count;
    guint   mon_cpu;
    GError *error = NULL;

    if (!cpufreq_file_get_contents ("/proc/cpufreq", &buffer, NULL, &error)) {
        g_warning ("%s", error->message);
        g_error_free (error);

        return FALSE;
    }

    g_object_get (G_OBJECT (monitor),
                  "cpu", &mon_cpu, NULL);

    count = 0;
    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 */
            count = sscanf (lines[i], "CPU %d %d kHz (%d %%) - %d kHz (%d %%) - %20s",
                            cpu, fmin, pmin, fmax, pmax, mode);

            if ((guint)(*cpu) == mon_cpu)
                break;
        }
    }

    g_strfreev (lines);
    g_free (buffer);

    return (count == 6);
}

static gboolean
cpufreq_procfs_cpu_is_online (void)
{
    return g_file_test ("/proc/cpufreq",
                        G_FILE_TEST_EXISTS | G_FILE_TEST_IS_REGULAR);
}

static gboolean
cpufreq_monitor_procfs_run (CPUFreqMonitor *monitor)
{
    gint   fmax, fmin, cpu;
    gint   pmin, pmax;
    gchar  mode[21];
    gint   cur_freq, max_freq;
    gchar *governor;

    if (!cpufreq_monitor_procfs_parse (CPUFREQ_MONITOR_PROCFS (monitor),
                                       &cpu, &fmax, &pmin, &pmax, &fmin, mode)) {
        /* Check whether it failed because
         * cpu is not online.
         */
        if (!cpufreq_procfs_cpu_is_online ()) {
            g_object_set (G_OBJECT (monitor), "online", FALSE, NULL);
            return TRUE;
        }
        return FALSE;
    }

    governor = mode;
    max_freq = fmax;

    if (g_ascii_strcasecmp (governor, "powersave") == 0) {
        cur_freq = fmin;
    } else if (g_ascii_strcasecmp (governor, "performance") == 0) {
        cur_freq = fmax;
    } else if (g_ascii_strcasecmp (governor, "userspace") == 0) {
        cur_freq = cpufreq_monitor_procfs_get_freq_from_userspace (cpu);
    } else {
        cur_freq = fmax;
    }

    g_object_set (G_OBJECT (monitor),
                  "online", TRUE,
                  "governor", governor,
                  "frequency", cur_freq,
                  "max-frequency", max_freq,
                  NULL);

    return TRUE;
}

static GList *
cpufreq_monitor_procfs_get_available_frequencies (CPUFreqMonitor *monitor)
{
    gint   fmax, fmin, cpu, freq;
    gint   pmin, pmax;
    gchar  mode[21];
    GList *list = NULL;

    if (!cpufreq_monitor_procfs_parse (CPUFREQ_MONITOR_PROCFS (monitor), &cpu,
                                       &fmax, &pmin, &pmax, &fmin, mode)) {
        return NULL;
    }

    if ((pmax > 0) && (pmax != 100)) {
        freq = (fmax * 100) / pmax;
        list = g_list_prepend (list, g_strdup_printf ("%d", freq));
    }

    list = g_list_prepend (list, g_strdup_printf ("%d", fmax));
    if (fmax != fmin)
        list = g_list_prepend (list, g_strdup_printf ("%d", fmin));

    return g_list_reverse (list);
}