path: root/drivers/hwmon/w83627ehf.c

/*
    w83627ehf - Driver for the hardware monitoring functionality of
                the Winbond W83627EHF Super-I/O chip
    Copyright (C) 2005  Jean Delvare <khali@linux-fr.org>
    Copyright (C) 2006  Yuan Mu <Ymu@Winbond.com.tw>,
                        Rudolf Marek <r.marek@sh.cvut.cz>

    Shamelessly ripped from the w83627hf driver
    Copyright (C) 2003  Mark Studebaker

    Thanks to Leon Moonen, Steve Cliffe and Grant Coady for their help
    in testing and debugging this driver.

    This driver also supports the W83627EHG, which is the lead-free
    version of the W83627EHF.

    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.


    Supports the following chips:

    Chip        #vin    #fan    #pwm    #temp   chip_id    man_id
    w83627ehf   10      5       4       3       0x88,0xa1  0x5ca3
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/i2c-isa.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include "lm75.h"

/* The actual ISA address is read from Super-I/O configuration space */
static unsigned short address;

/*
 * Super-I/O constants and functions
 */

static int REG;		/* The register to read/write */
static int VAL;		/* The value to read/write */

#define W83627EHF_LD_HWM	0x0b

#define SIO_REG_LDSEL		0x07	/* Logical device select */
#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */
#define SIO_REG_ENABLE		0x30	/* Logical device enable */
#define SIO_REG_ADDR		0x60	/* Logical device address (2 bytes) */

#define SIO_W83627EHF_ID	0x8840
#define SIO_ID_MASK		0xFFC0

static inline void
superio_outb(int reg, int val)
{
	outb(reg, REG);
	outb(val, VAL);
}

static inline int
superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

static inline void
superio_select(int ld)
{
	outb(SIO_REG_LDSEL, REG);
	outb(ld, VAL);
}

static inline void
superio_enter(void)
{
	outb(0x87, REG);
	outb(0x87, REG);
}

static inline void
superio_exit(void)
{
	outb(0x02, REG);
	outb(0x02, VAL);
}

/*
 * ISA constants
 */

#define REGION_ALIGNMENT	~7
#define REGION_OFFSET		5
#define REGION_LENGTH		2
#define ADDR_REG_OFFSET		5
#define DATA_REG_OFFSET		6

#define W83627EHF_REG_BANK		0x4E
#define W83627EHF_REG_CONFIG		0x40
#define W83627EHF_REG_CHIP_ID		0x49
#define W83627EHF_REG_MAN_ID		0x4F

static const u16 W83627EHF_REG_FAN[] = { 0x28, 0x29, 0x2a, 0x3f, 0x553 };
static const u16 W83627EHF_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d, 0x3e, 0x55c };

/* The W83627EHF registers for nr=7,8,9 are in bank 5 */
#define W83627EHF_REG_IN_MAX(nr)	((nr < 7) ? (0x2b + (nr) * 2) : \