conky/src/sony.c

/* Conky, a system monitor, based on torsmo
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
 * Copyright (c) 2009 Yeon-Hyeong Yang <lbird94@gmail.com>
 *	(see AUTHORS)
 * All rights reserved.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 * vim: ts=4 sw=4 noet ai cindent syntax=c
 *
 */
/* conky support for information from sony_laptop kernel module
 *   information from sony_laptop kernel module
 *   /sys/devices/platform/sony-laptop
 *   I mimicked the methods from ibm.c
 * Yeon-Hyeong Yang <lbird94@gmail.com> */

#include "conky.h"
#include "config.h"
#include "sony.h"
#include "logging.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>

#define SONY_LAPTOP_DIR "/sys/devices/platform/sony-laptop"

/* fanspeed in SONY_LAPTOP_DIR contains an integer value for fanspeed (0~255).
 * I don't know the exact measurement unit, though. I may assume that 0 for
 * 'fan stopped' and 255 for 'maximum fan speed'. */
void get_sony_fanspeed(char *p_client_buffer, size_t client_buffer_size)
{
	FILE *fp;
	unsigned int speed = 0;
	char fan[128];

	if (!p_client_buffer || client_buffer_size <= 0) {
		return;
	}

	snprintf(fan, 127, "%s/fanspeed", SONY_LAPTOP_DIR);

	fp = fopen(fan, "r");
	if (fp != NULL) {
		while (!feof(fp)) {
			char line[256];

			if (fgets(line, 255, fp) == NULL) {
				break;
			}
			if (sscanf(line, "%u", &speed)) {
				break;
			}
		}
	} else {
		CRIT_ERR(NULL, NULL, "can't open '%s': %s\nEnable sony support or remove "
			"sony* from your "PACKAGE_NAME" config file.",
			fan, strerror(errno));
	}

	fclose(fp);
	snprintf(p_client_buffer, client_buffer_size, "%d", speed);
}