path: root/drivers/hwmon/pc87360.c

/*
 *  pc87360.c - Part of lm_sensors, Linux kernel modules
 *              for hardware monitoring
 *  Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
 *
 *  Copied from smsc47m1.c:
 *  Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.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.
 *
 *  Supports the following chips:
 *
 *  Chip        #vin    #fan    #pwm    #temp   devid
 *  PC87360     -       2       2       -       0xE1
 *  PC87363     -       2       2       -       0xE8
 *  PC87364     -       3       3       -       0xE4
 *  PC87365     11      3       3       2       0xE5
 *  PC87366     11      3       3       3-4     0xE9
 *
 *  This driver assumes that no more than one chip is present, and one of
 *  the standard Super-I/O addresses is used (0x2E/0x2F or 0x4E/0x4F).
 */

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

static u8 devid;
static unsigned short address;
static unsigned short extra_isa[3];
static u8 confreg[4];

enum chips { any_chip, pc87360, pc87363, pc87364, pc87365, pc87366 };

static int init = 1;
module_param(init, int, 0);
MODULE_PARM_DESC(init,
 "Chip initialization level:\n"
 " 0: None\n"
 "*1: Forcibly enable internal voltage and temperature channels, except in9\n"
 " 2: Forcibly enable all voltage and temperature channels, except in9\n"
 " 3: Forcibly enable all voltage and temperature channels, including in9");

/*
 * Super-I/O registers and operations
 */

#define DEV	0x07	/* Register: Logical device select */
#define DEVID	0x20	/* Register: Device ID */
#define ACT	0x30	/* Register: Device activation */
#define BASE	0x60	/* Register: Base address */

#define FSCM	0x09	/* Logical device: fans */
#define VLM	0x0d	/* Logical device: voltages */
#define TMS	0x0e	/* Logical device: temperatures */
static const u8 logdev[3] = { FSCM, VLM, TMS };

#define LD_FAN		0
#define LD_IN		1
#define LD_TEMP		2

static inline void superio_outb(int sioaddr, int reg, int val)
{
	outb(reg, sioaddr);
	outb(val, sioaddr+1);
}

static inline int superio_inb(int sioaddr, int reg)
{
	outb(reg, sioaddr);
	return inb(sioaddr+1);
}

static inline void superio_exit(int sioaddr)
{
	outb(0x02, sioaddr);
	outb(0x02, sioaddr+1);
}

/*
 * Logical devices
 */

#define PC87360_EXTENT		0x10
#define PC87365_REG_BANK	0x09
#define NO_BANK			0xff

/*
 * Fan registers and conversions
 */

/* nr has to be 0 or 1 (PC87360/87363) or 2 (PC87364/87365/87366) */
#define PC87360_REG_PRESCALE(nr)	(0x00 + 2 * (nr))
#define PC87360_REG_PWM(nr)		(0x01 + 2 * (nr))
#define PC87360_REG_FAN_MIN(nr)		(0x06 + 3 * (nr))
#define PC87360_REG_FAN(nr)		(0x07 + 3 * (nr))
#define PC87360_REG_FAN_STATUS(nr)	(0x08 + 3 * (nr))

#define FAN_FROM_REG(val,div)		((val) == 0 ? 0: \
					 480000 / ((val)*(div)))
#define FAN_TO_REG(val,div)		((val) <= 100 ? 0 : \
					 480000 / ((val)*(div)))
#define FAN_DIV_FROM_REG(val)		(1 << ((val >> 5) & 0x03))
#define FAN_STATUS_FROM_REG(val)	((val) & 0x07)

#define FAN_CONFIG_MONITOR(val,nr)	(((val) >> (2 + nr * 3)) & 1)
#define FAN_CONFIG_CONTROL(val,nr)	(((val) >> (3 + nr * 3)) & 1)
#define FAN_CONFIG_INVERT(val,nr)	(((val) >> (4 + nr * 3)) & 1)

#define PWM_FROM_REG(val,inv)		((inv) ? 255 - (val) : (val))
static inline u8 PWM_TO_REG(int val, int inv)
{
	if (inv)
		val = 255 - val;
	if (val < 0)
		return 0;
	if (val > 255)
		return 255;
	return val;
}

/*
 * Voltage registers and conversions
 */

#define PC87365_REG_IN_CONVRATE		0x07
#define PC87365_REG_IN_CONFIG		0x08
#define PC87365_REG_IN			0x0B
#define PC87365_REG_IN_MIN		0x0D
#define PC87365_REG_IN_MAX		0x0C
#define PC87365_REG_IN_STATUS		0x0A
#define PC87365_REG_IN_ALARMS1		0x00
#define PC87365_REG_IN_ALARMS2		0x01
#define PC87365_REG_VID			0x06

#define IN_FROM_REG(val,ref)		(((val) * (ref) + 128) / 256)
#define IN_TO_REG(val,ref)		((val) < 0 ? 0 : \
					 (val)*256 >= (ref)*255 ? 255: \
					 ((val) * 256 + (ref)/2) / (ref))

/*
 * Temperature registers and conversions
 */

#define PC87365_REG_TEMP_CONFIG		0x08
#define PC87365_REG_TEMP		0x0B
#define PC87365_REG_TEMP_MIN		0x0D
#define PC87365_REG_TEMP_MAX		0x0C
#define PC87365_REG_TEMP_CRIT		0x0E
#define PC87365_REG_TEMP_STATUS		0x0A
#define PC87365_REG_TEMP_ALARMS		0x00

#define TEMP_FROM_REG(val)		((val) * 1000)
#define TEMP_TO_REG(val)		((val) < -55000 ? -55 : \
					 (val) > 127000 ? 127 : \
					 (val) < 0 ? ((val) - 500) / 1000 : \
					 ((val) + 500) / 1000)

/*
 * Client data (each client gets its own)
 */

struct pc87360_data {
	struct i2c_client client;
	struct class_device *class_dev;
	struct mutex lock;
	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	int address