pc87360.c

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/*
 *  pc87360.c - Part of lm_sensors, Linux kernel modules
 *              for hardware monitoring
 *  Copyright (C) 2004, 2007 Jean Delvare <[e-mail]>
 *
 *  Copied from smsc47m1.c:
 *  Copyright (C) 2002 Mark D. Studebaker <[e-mail]>
 *
 *  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/platform_device.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 struct platform_device *pdev;
static unsigned short extra_isa[3];
static u8 confreg[4];

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)

/*
 * Device data
 */

struct pc87360_data {
	const char *name;
	struct device *hwmon_dev;
	struct mutex lock;
	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	int address[3];

	u8 fannr, innr, tempnr;

	u8 fan[3];		/* Register value */
	u8 fan_min[3];		/* Register value */
	u8 fan_status[3];	/* Register value */
	u8 pwm[3];		/* Register value */
	u16 fan_conf;		/* Configuration register values, combined */

	u16 in_vref;		/* 1 mV/bit */
	u8 in[14];		/* Register value */
	u8 in_min[14];		/* Register value */
	u8 in_max[14];		/* Register value */
	u8 in_crit[3];		/* Register value */
	u8 in_status[14];	/* Register value */
	u16 in_alarms;		/* Register values, combined, masked */
	u8 vid_conf;		/* Configuration register value */
	u8 vrm;
	u8 vid;			/* Register value */

	s8 temp[3];		/* Register value */
	s8 temp_min[3];		/* Register value */
	s8 temp_max[3];		/* Register value */
	s8 temp_crit[3];	/* Register value */
	u8 temp_status[3];	/* Register value */
	u8 temp_alarms;		/* Register value, masked */
};

/*
 * Functions declaration
 */

static int pc87360_probe(struct platform_device *pdev);
static int __devexit pc87360_remove(struct platform_device *pdev);

static int pc87360_read_value(struct pc87360_data *data, u8 ldi, u8 bank,
			      u8 reg);
static void pc87360_write_value(struct pc87360_data *data, u8 ldi, u8 bank,
				u8 reg, u8 value);
static void pc87360_init_device(struct platform_device *pdev,
				int use_thermistors);
static struct pc87360_data *pc87360_update_device(struct device *dev);

/*
 * Driver data
 */

static struct platform_driver pc87360_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "pc87360",
	},
	.probe		= pc87360_probe,
	.remove		= __devexit_p(pc87360_remove),
};

/*
 * Sysfs stuff
 */

static ssize_t show_fan_input(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = pc87360_update_device(dev);
	return sprintf(buf, "%u\n", FAN_FROM_REG(data->fan[attr->index],
		       FAN_DIV_FROM_REG(data->fan_status[attr->index])));
}
static ssize_t show_fan_min(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = pc87360_update_device(dev);
	return sprintf(buf, "%u\n", FAN_FROM_REG(data->fan_min[attr->index],
		       FAN_DIV_FROM_REG(data->fan_status[attr->index])));
}
static ssize_t show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = pc87360_update_device(dev);
	return sprintf(buf, "%u\n",
		       FAN_DIV_FROM_REG(data->fan_status[attr->index]));
}
static ssize_t show_fan_status(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = pc87360_update_device(dev);
	return sprintf(buf, "%u\n",
		       FAN_STATUS_FROM_REG(data->fan_status[attr->index]));
}
static ssize_t set_fan_min(struct device *dev, struct device_attribute *devattr, const char *buf,
	size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = dev_get_drvdata(dev);
	long fan_min = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	fan_min = FAN_TO_REG(fan_min, FAN_DIV_FROM_REG(data->fan_status[attr->index]));

	/* If it wouldn't fit, change clock divisor */
	while (fan_min > 255
	    && (data->fan_status[attr->index] & 0x60) != 0x60) {
		fan_min >>= 1;
		data->fan[attr->index] >>= 1;
		data->fan_status[attr->index] += 0x20;
	}
	data->fan_min[attr->index] = fan_min > 255 ? 255 : fan_min;
	pc87360_write_value(data, LD_FAN, NO_BANK, PC87360_REG_FAN_MIN(attr->index),
			    data->fan_min[attr->index]);

	/* Write new divider, preserve alarm bits */
	pc87360_write_value(data, LD_FAN, NO_BANK, PC87360_REG_FAN_STATUS(attr->index),
			    data->fan_status[attr->index] & 0xF9);
	mutex_unlock(&data->update_lock);

	return count;
}

static struct sensor_device_attribute fan_input[] = {
	SENSOR_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0),
	SENSOR_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1),
	SENSOR_ATTR(fan3_input, S_IRUGO, show_fan_input, NULL, 2),
};
static struct sensor_device_attribute fan_status[] = {
	SENSOR_ATTR(fan1_status, S_IRUGO, show_fan_status, NULL, 0),
	SENSOR_ATTR(fan2_status, S_IRUGO, show_fan_status, NULL, 1),
	SENSOR_ATTR(fan3_status, S_IRUGO, show_fan_status, NULL, 2),
};
static struct sensor_device_attribute fan_div[] = {
	SENSOR_ATTR(fan1_div, S_IRUGO, show_fan_div, NULL, 0),
	SENSOR_ATTR(fan2_div, S_IRUGO, show_fan_div, NULL, 1),
	SENSOR_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2),
};
static struct sensor_device_attribute fan_min[] = {
	SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min, set_fan_min, 0),
	SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min, set_fan_min, 1),
	SENSOR_ATTR(fan3_min, S_IWUSR | S_IRUGO, show_fan_min, set_fan_min, 2),
};

#define FAN_UNIT_ATTRS(X)	\
	&fan_input[X].dev_attr.attr,	\
	&fan_status[X].dev_attr.attr,	\
	&fan_div[X].dev_attr.attr,	\
	&fan_min[X].dev_attr.attr

static ssize_t show_pwm(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = pc87360_update_device(dev);
	return sprintf(buf, "%u\n",
		       PWM_FROM_REG(data->pwm[attr->index],
				    FAN_CONFIG_INVERT(data->fan_conf,
						      attr->index)));
}
static ssize_t set_pwm(struct device *dev, struct device_attribute *devattr, const char *buf,
	size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct pc87360_data *data = dev_get_drvdata(dev);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->pwm[attr->index] = PWM_TO_REG(val,
			      FAN_CONFIG_INVERT(data->fan_conf, attr->index));
	pc87360_write_value(data, LD_FAN, NO_BANK, PC87360_REG_PWM(attr->index),
			    data->pwm[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static struct sensor_device_attribute pwm[] = {
	SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0),
	SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1),
	SENSOR_ATTR(pwm3, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 2),
};

static struct attribute * pc8736x_fan_attr_array[] = {
	FAN_UNIT_ATTRS(0),
	FAN_UNIT_ATTRS(1),
	FAN_UNIT_ATTRS(2),
	&pwm[0].dev_attr.attr,
	&pwm[1].dev_attr.attr,
	&pwm[2].dev_attr.attr,
	NULL
};
static const struct attribute_group pc8736x_fan_group = {
	.attrs = pc8736x_fan_attr_array,
};