drivers/hwmon/asb100.c



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/*
 * asb100.c - Part of lm_sensors, Linux kernel modules for hardware
 *	      monitoring
 *
 * Copyright (C) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
 *
 * (derived from w83781d.c)
 *
 * Copyright (C) 1998 - 2003  Frodo Looijaard <frodol@dds.nl>,
 *			      Philip Edelbrock <phil@netroedge.com>, and
 *			      Mark 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.
 */

/*
 * This driver supports the hardware sensor chips: Asus ASB100 and
 * ASB100-A "BACH".
 *
 * ASB100-A supports pwm1, while plain ASB100 does not.  There is no known
 * way for the driver to tell which one is there.
 *
 * Chip		#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
 * asb100	7	3	1	4	0x31	0x0694	yes	no
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include "lm75.h"

/* I2C addresses to scan */
static const unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };

static unsigned short force_subclients[4];
module_param_array(force_subclients, short, NULL, 0);
MODULE_PARM_DESC(force_subclients, "List of subclient addresses: "
	"{bus, clientaddr, subclientaddr1, subclientaddr2}");

/* Voltage IN registers 0-6 */
#define ASB100_REG_IN(nr)	(0x20 + (nr))
#define ASB100_REG_IN_MAX(nr)	(0x2b + (nr * 2))
#define ASB100_REG_IN_MIN(nr)	(0x2c + (nr * 2))

/* FAN IN registers 1-3 */
#define ASB100_REG_FAN(nr)	(0x28 + (nr))
#define ASB100_REG_FAN_MIN(nr)	(0x3b + (nr))

/* TEMPERATURE registers 1-4 */
static const u16 asb100_reg_temp[]	= {0, 0x27, 0x150, 0x250, 0x17};
static const u16 asb100_reg_temp_max[]	= {0, 0x39, 0x155, 0x255, 0x18};
static const u16 asb100_reg_temp_hyst[]	= {0, 0x3a, 0x153, 0x253, 0x19};

#define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
#define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
#define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])

#define ASB100_REG_TEMP2_CONFIG	0x0152
#define ASB100_REG_TEMP3_CONFIG	0x0252


#define ASB100_REG_CONFIG	0x40
#define ASB100_REG_ALARM1	0x41
#define ASB100_REG_ALARM2	0x42
#define ASB100_REG_SMIM1	0x43
#define ASB100_REG_SMIM2	0x44
#define ASB100_REG_VID_FANDIV	0x47
#define ASB100_REG_I2C_ADDR	0x48
#define ASB100_REG_CHIPID	0x49
#define ASB100_REG_I2C_SUBADDR	0x4a
#define ASB100_REG_PIN		0x4b
#define ASB100_REG_IRQ		0x4c
#define ASB100_REG_BANK		0x4e
#define ASB100_REG_CHIPMAN	0x4f

#define ASB100_REG_WCHIPID	0x58

/* bit 7 -> enable, bits 0-3 -> duty cycle */
#define ASB100_REG_PWM1		0x59

/*
 * CONVERSIONS
 * Rounding and limit checking is only done on the TO_REG variants.
 */

/* These constants are a guess, consistent w/ w83781d */
#define ASB100_IN_MIN		0
#define ASB100_IN_MAX		4080

/*
 * IN: 1/1000 V (0V to 4.08V)
 * REG: 16mV/bit
 */
static u8 IN_TO_REG(unsigned val)
{
	unsigned nval = SENSORS_LIMIT(val, ASB100_IN_MIN, ASB100_IN_MAX);
	return (nval + 8) / 16;
}

static unsigned IN_FROM_REG(u8 reg)
{
	return reg * 16;
}

static u8 FAN_TO_REG(long rpm, int div)
{
	if (rpm == -1)
		return 0;
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

static int FAN_FROM_REG(u8 val, int div)
{
	return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
}

/* These constants are a guess, consistent w/ w83781d */
#define ASB100_TEMP_MIN		-128000
#define ASB100_TEMP_MAX		127000

/*
 * TEMP: 0.001C/bit (-128C to +127C)
 * REG: 1C/bit, two's complement
 */
static u8 TEMP_TO_REG(long temp)
{
	int ntemp = SENSORS_LIMIT(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);
	ntemp += (ntemp < 0 ? -500 : 500);
	return (u8)(ntemp / 1000);
}

static int TEMP_FROM_REG(u8 reg)
{
	return (s8)reg * 1000;
}

/*
 * PWM: 0 - 255 per sensors documentation
 * REG: (6.25% duty cycle per bit)
 */
static u8 ASB100_PWM_TO_REG(int pwm)
{
	pwm = SENSORS_LIMIT(pwm, 0, 255);
	return (u8)(pwm / 16);
}

static int ASB100_PWM_FROM_REG(u8 reg)
{
	return reg * 16;
}

#define DIV_FROM_REG(val) (1 << (val))

/*
 * FAN DIV: 1, 2, 4, or 8 (defaults to 2)
 * REG: 0, 1, 2, or 3 (respectively) (defaults to 1)
 */
static u8 DIV_TO_REG(long val)
{
	return val == 8 ? 3 : val == 4 ? 2 : val == 1 ? 0 : 1;
}

/*
 * For each registered client, we need to keep some data in memory. That
 * data is pointed to by client->data. The structure itself is
 * dynamically allocated, at the same time the client itself is allocated.
 */
struct asb100_data {
	struct device *hwmon_dev;
	struct mutex lock;

	struct mutex update_lock;
	unsigned long last_updated;	/* In jiffies */

	/* array of 2 pointers to subclients */
	struct i2c_client *lm75[2];

	char valid;		/* !=0 if following fields are valid */
	u8 in[7];		/* Register value */
	u8 in_max[7];		/* Register value */
	u8 in_min[7];		/* Register value */
	u8 fan[3];		/* Register value */
	u8 fan_min[3];		/* Register value */
	u16 temp[4];		/* Register value (0 and 3 are u8 only) */
	u16 temp_max[4];	/* Register value (0 and 3 are u8 only) */
	u16 temp_hyst[4];	/* Register value (0 and 3 are u8 only) */
	u8 fan_div[3];		/* Register encoding, right justified */
	u8 pwm;			/* Register encoding */
	u8 vid;			/* Register encoding, combined */
	u32 alarms;		/* Register encoding, combined */
	u8 vrm;
};

static int asb100_read_value(struct i2c_client *client, u16 reg);
static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);

static int asb100_probe(struct i2c_client *client,
			const struct i2c_device_id *id);
static int asb100_detect(struct i2c_client *client,
			 struct i2c_board_info *info);