path: root/drivers/hwmon/fschmd.c

/* fschmd.c
 *
 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *  Merged Fujitsu Siemens hwmon driver, supporting the Poseidon, Hermes,
 *  Scylla, Heracles and Heimdall chips
 *
 *  Based on the original 2.4 fscscy, 2.6 fscpos, 2.6 fscher and 2.6
 *  (candidate) fschmd drivers:
 *  Copyright (C) 2006 Thilo Cestonaro
 *			<thilo.cestonaro.external@fujitsu-siemens.com>
 *  Copyright (C) 2004, 2005 Stefan Ott <stefan@desire.ch>
 *  Copyright (C) 2003, 2004 Reinhard Nissl <rnissl@gmx.de>
 *  Copyright (c) 2001 Martin Knoblauch <mkn@teraport.de, knobi@knobisoft.de>
 *  Copyright (C) 2000 Hermann Jung <hej@odn.de>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/dmi.h>
#include <linux/fs.h>
#include <linux/watchdog.h>
#include <linux/miscdevice.h>
#include <linux/uaccess.h>
#include <linux/kref.h>

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x73, I2C_CLIENT_END };

/* Insmod parameters */
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
I2C_CLIENT_INSMOD_5(fscpos, fscher, fscscy, fschrc, fschmd);

/*
 * The FSCHMD registers and other defines
 */

/* chip identification */
#define FSCHMD_REG_IDENT_0		0x00
#define FSCHMD_REG_IDENT_1		0x01
#define FSCHMD_REG_IDENT_2		0x02
#define FSCHMD_REG_REVISION		0x03

/* global control and status */
#define FSCHMD_REG_EVENT_STATE		0x04
#define FSCHMD_REG_CONTROL		0x05

#define FSCHMD_CONTROL_ALERT_LED	0x01

/* watchdog */
#define FSCHMD_REG_WDOG_PRESET		0x28
#define FSCHMD_REG_WDOG_STATE		0x23
#define FSCHMD_REG_WDOG_CONTROL		0x21

#define FSCHMD_WDOG_CONTROL_TRIGGER	0x10
#define FSCHMD_WDOG_CONTROL_STARTED	0x10 /* the same as trigger */
#define FSCHMD_WDOG_CONTROL_STOP	0x20
#define FSCHMD_WDOG_CONTROL_RESOLUTION	0x40

#define FSCHMD_WDOG_STATE_CARDRESET	0x02

/* voltages, weird order is to keep the same order as the old drivers */
static const u8 FSCHMD_REG_VOLT[3] = { 0x45, 0x42, 0x48 };

/* minimum pwm at which the fan is driven (pwm can by increased depending on
   the temp. Notice that for the scy some fans share there minimum speed.
   Also notice that with the scy the sensor order is different than with the
   other chips, this order was in the 2.4 driver and kept for consistency. */
static const u8 FSCHMD_REG_FAN_MIN[5][6] = {
	{ 0x55, 0x65 },					/* pos */
	{ 0x55, 0x65, 0xb5 },				/* her */
	{ 0x65, 0x65, 0x55, 0xa5, 0x55, 0xa5 },		/* scy */
	{ 0x55, 0x65, 0xa5, 0xb5 },			/* hrc */
	{ 0x55, 0x65, 0xa5, 0xb5, 0xc5 },		/* hmd */
};

/* actual fan speed */
static const u8 FSCHMD_REG_FAN_ACT[5][6] = {
	{ 0x0e, 0x6b, 0xab },				/* pos */
	{ 0x0e, 0x6b, 0xbb },				/* her */
	{ 0x6b, 0x6c, 0x0e, 0xab, 0x5c, 0xbb },		/* scy */
	{ 0x0e, 0x6b, 0xab, 0xbb },			/* hrc */
	{ 0x5b, 0x6b, 0xab, 0xbb, 0xcb },		/* hmd */
};

/* fan status registers */
static const u8 FSCHMD_REG_FAN_STATE[5][6] = {
	{ 0x0d, 0x62, 0xa2 },				/* pos */
	{ 0x0d, 0x62, 0xb2 },				/* her */