gkfreq_cpu3.c

/*
    GKrellM-gkfreq
    
    A plugin to GKrellM that displays the current CPU frequencies.
    
    Authors:
    Brad Davis <brad@peakunix.net> (version 1.0)
    Erik Kjellson <erikiiofph7@users.sourceforge.net>
    
    Copyright (C) 2005-2010

    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
*/

/*
 * Using code from gkx86info http://anchois.free.fr/
 * with patches from whatdoineed2do@yahoo.co.uk
 * and knefas@gmail.com
 */

#include <gkrellm2/gkrellm.h>
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#include <unistd.h>

#define	CONFIG_NAME	"gkfreq_cpu3"
#define	STYLE_NAME	"gkfreq_cpu3"

static GkrellmMonitor	*monitor;
static GkrellmPanel	*panel;
static GkrellmDecal	*decal_text1;
static gint	style_id;


__inline__ unsigned long long int rdtsc()
{
	unsigned long long int x;
	__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
	return x;
}

static
void read_MHz(char* buffer_, size_t bufsz_)
{
   FILE *f;
   if ( (f = fopen("/sys/devices/system/cpu/cpu3/cpufreq/scaling_cur_freq", "r")) == NULL) {

       snprintf(buffer_, bufsz_, "n/a MHz");
   }
   else {
       int i;
       fscanf(f, "%d", &i );
       snprintf(buffer_, bufsz_, "%d MHz", i/1000 );
       fclose(f);
   }
}

static gint
panel_expose_event(GtkWidget *widget, GdkEventExpose *ev) {

	gdk_draw_pixmap(widget->window,
			widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
			panel->pixmap, ev->area.x, ev->area.y, ev->area.x, ev->area.y,
			ev->area.width, ev->area.height);
	return FALSE;
}


static void
update_plugin() {

	static gint	x_scroll, w;
	static gchar  info[32];

	if (w == 0)
		w = gkrellm_chart_width();
	x_scroll = (x_scroll + 1) % (2 * w);
	
	// dont do it too much...
	if ((GK.timer_ticks % 10) != 0) return;

	read_MHz(info, 31);

	decal_text1->x_off =
		(w - gdk_string_width(decal_text1->text_style.font,
		                      info)) / 2;
	if (decal_text1->x_off < 0)
		decal_text1->x_off = 0;

	gkrellm_draw_decal_text(panel, decal_text1, info, w - x_scroll);
	gkrellm_draw_panel_layers(panel);
}


static void
create_plugin(GtkWidget *vbox, gint first_create) {

	GkrellmStyle			*style;
	GkrellmTextstyle		*ts, *ts_alt;

	if (first_create)
		panel = gkrellm_panel_new0();

	style = gkrellm_meter_style(style_id);

	ts = gkrellm_meter_textstyle(style_id);
	ts_alt = gkrellm_meter_alt_textstyle(style_id);

	decal_text1 = gkrellm_create_decal_text(panel, "8MHz", ts, style,
					-1, -1, -1);

	gkrellm_panel_configure(panel, NULL, style);
	gkrellm_panel_create(vbox, monitor, panel);

	if (first_create)
	    g_signal_connect(G_OBJECT (panel->drawing_area), "expose_event",
    	        G_CALLBACK (panel_expose_event), NULL);
}


static GkrellmMonitor	plugin_mon = {

	CONFIG_NAME,		/* Name, for config tab.    */
	0,			/* Id,  0 if a plugin       */
	create_plugin,		/* The create function      */
	update_plugin,		/* The update function      */
	NULL,			/* The config tab create function   */
	NULL,			/* Apply the config function        */

	NULL,			/* Save user config			*/
	NULL,			/* Load user config			*/
	NULL,			/* config keyword			*/

	NULL,			/* Undefined 2	*/
	NULL,			/* Undefined 1	*/
	NULL,			/* private		*/

	MON_INSERT_AFTER|MON_CPU,	/* Insert plugin before this monitor			*/

	NULL,			/* Handle if a plugin, filled in by GKrellM     */
	NULL			/* path if a plugin, filled in by GKrellM       */
};


GkrellmMonitor *
gkrellm_init_plugin() {

	style_id = gkrellm_add_meter_style(&plugin_mon, STYLE_NAME);
	monitor = &plugin_mon;
	return &plugin_mon;
}