vt1211.c

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/*
 * vt1211.c - driver for the VIA VT1211 Super-I/O chip integrated hardware
 *            monitoring features
 * Copyright (C) 2006 Juerg Haefliger <[e-mail]>
 *
 * This driver is based on the driver for kernel 2.4 by Mark D. Studebaker
 * and its port to kernel 2.6 by Lars Ekman.
 *
 * 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.
 */

#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 <linux/ioport.h>
#include <asm/io.h>

static int uch_config = -1;
module_param(uch_config, int, 0);
MODULE_PARM_DESC(uch_config, "Initialize the universal channel configuration");

static int int_mode = -1;
module_param(int_mode, int, 0);
MODULE_PARM_DESC(int_mode, "Force the temperature interrupt mode");

static struct platform_device *pdev;

#define DRVNAME "vt1211"

/* ---------------------------------------------------------------------
 * Registers
 *
 * The sensors are defined as follows.
 *
 * Sensor          Voltage Mode   Temp Mode   Notes (from the datasheet)
 * --------        ------------   ---------   --------------------------
 * Reading 1                      temp1       Intel thermal diode
 * Reading 3                      temp2       Internal thermal diode
 * UCH1/Reading2   in0            temp3       NTC type thermistor
 * UCH2            in1            temp4       +2.5V
 * UCH3            in2            temp5       VccP
 * UCH4            in3            temp6       +5V
 * UCH5            in4            temp7       +12V
 * 3.3V            in5                        Internal VDD (+3.3V)
 *
 * --------------------------------------------------------------------- */

/* Voltages (in) numbered 0-5 (ix) */
#define VT1211_REG_IN(ix)		(0x21 + (ix))
#define VT1211_REG_IN_MIN(ix)		((ix) == 0 ? 0x3e : 0x2a + 2 * (ix))
#define VT1211_REG_IN_MAX(ix)		((ix) == 0 ? 0x3d : 0x29 + 2 * (ix))

/* Temperatures (temp) numbered 0-6 (ix) */
static u8 regtemp[]	= {0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25};
static u8 regtempmax[]	= {0x39, 0x1d, 0x3d, 0x2b, 0x2d, 0x2f, 0x31};
static u8 regtemphyst[]	= {0x3a, 0x1e, 0x3e, 0x2c, 0x2e, 0x30, 0x32};

/* Fans numbered 0-1 (ix) */
#define VT1211_REG_FAN(ix)		(0x29 + (ix))
#define VT1211_REG_FAN_MIN(ix)		(0x3b + (ix))
#define VT1211_REG_FAN_DIV		 0x47

/* PWMs numbered 0-1 (ix) */
/* Auto points numbered 0-3 (ap) */
#define VT1211_REG_PWM(ix)		(0x60 + (ix))
#define VT1211_REG_PWM_CLK		 0x50
#define VT1211_REG_PWM_CTL		 0x51
#define VT1211_REG_PWM_AUTO_TEMP(ap)	(0x55 - (ap))
#define VT1211_REG_PWM_AUTO_PWM(ix, ap)	(0x58 + 2 * (ix) - (ap))

/* Miscellaneous registers */
#define VT1211_REG_CONFIG		0x40
#define VT1211_REG_ALARM1		0x41
#define VT1211_REG_ALARM2		0x42
#define VT1211_REG_VID			0x45
#define VT1211_REG_UCH_CONFIG		0x4a
#define VT1211_REG_TEMP1_CONFIG		0x4b
#define VT1211_REG_TEMP2_CONFIG		0x4c

/* In, temp & fan alarm bits */
static const u8 bitalarmin[]	= {11, 0, 1, 3, 8, 2, 9};
static const u8 bitalarmtemp[]	= {4, 15, 11, 0, 1, 3, 8};
static const u8 bitalarmfan[]	= {6, 7};

/* ---------------------------------------------------------------------
 * Data structures and manipulation thereof
 * --------------------------------------------------------------------- */

struct vt1211_data {
	unsigned short addr;
	const char *name;
	struct device *hwmon_dev;

	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* Register values */
	u8  in[6];
	u8  in_max[6];
	u8  in_min[6];
	u8  temp[7];
	u8  temp_max[7];
	u8  temp_hyst[7];
	u8  fan[2];
	u8  fan_min[2];
	u8  fan_div[2];
	u8  fan_ctl;
	u8  pwm[2];
	u8  pwm_ctl[2];
	u8  pwm_clk;
	u8  pwm_auto_temp[4];
	u8  pwm_auto_pwm[2][4];
	u8  vid;		/* Read once at init time */
	u8  vrm;
	u8  uch_config;		/* Read once at init time */
	u16 alarms;
};

/* ix = [0-5] */
#define ISVOLT(ix, uch_config)	((ix) > 4 ? 1 : \
				 !(((uch_config) >> ((ix) + 2)) & 1))

/* ix = [0-6] */
#define ISTEMP(ix, uch_config)	((ix) < 2 ? 1 : \
				 ((uch_config) >> (ix)) & 1)

/* in5 (ix = 5) is special. It's the internal 3.3V so it's scaled in the
   driver according to the VT1211 BIOS porting guide */
#define IN_FROM_REG(ix, reg)	((reg) < 3 ? 0 : (ix) == 5 ? \
				 (((reg) - 3) * 15882 + 479) / 958 : \
				 (((reg) - 3) * 10000 + 479) / 958)
#define IN_TO_REG(ix, val)	(SENSORS_LIMIT((ix) == 5 ? \
				 ((val) * 958 + 7941) / 15882 + 3 : \
				 ((val) * 958 + 5000) / 10000 + 3, 0, 255))

/* temp1 (ix = 0) is an intel thermal diode which is scaled in user space.
   temp2 (ix = 1) is the internal temp diode so it's scaled in the driver
   according to some measurements that I took on an EPIA M10000.
   temp3-7 are thermistor based so the driver returns the voltage measured at
   the pin (range 0V - 2.2V). */
#define TEMP_FROM_REG(ix, reg)	((ix) == 0 ? (reg) * 1000 : \
				 (ix) == 1 ? (reg) < 51 ? 0 : \
				 ((reg) - 51) * 1000 : \
				 ((253 - (reg)) * 2200 + 105) / 210)
#define TEMP_TO_REG(ix, val)	SENSORS_LIMIT( \
				 ((ix) == 0 ? ((val) + 500) / 1000 : \
				  (ix) == 1 ? ((val) + 500) / 1000 + 51 : \
				  253 - ((val) * 210 + 1100) / 2200), 0, 255)

#define DIV_FROM_REG(reg)	(1 << (reg))

#define RPM_FROM_REG(reg, div)	(((reg) == 0) || ((reg) == 255) ? 0 : \
				 1310720 / (reg) / DIV_FROM_REG(div))
#define RPM_TO_REG(val, div)	((val) == 0 ? 255 : \
				 SENSORS_LIMIT((1310720 / (val) / \
				 DIV_FROM_REG(div)), 1, 254))

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

/* Configuration index port registers
 * The vt1211 can live at 2 different addresses so we need to probe both */
#define SIO_REG_CIP1		0x2e
#define SIO_REG_CIP2		0x4e

/* Configuration registers */
#define SIO_VT1211_LDN		0x07	/* logical device number */
#define SIO_VT1211_DEVID	0x20	/* device ID */
#define SIO_VT1211_DEVREV	0x21	/* device revision */
#define SIO_VT1211_ACTIVE	0x30	/* HW monitor active */
#define SIO_VT1211_BADDR	0x60	/* base I/O address */
#define SIO_VT1211_ID		0x3c	/* VT1211 device ID */

/* VT1211 logical device numbers */
#define SIO_VT1211_LDN_HWMON	0x0b	/* HW monitor */

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

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

static inline void superio_select(int sio_cip, int ldn)
{
	outb(SIO_VT1211_LDN, sio_cip);
	outb(ldn, sio_cip + 1);
}

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

static inline void superio_exit(int sio_cip)
{
	outb(0xaa, sio_cip);
}

/* ---------------------------------------------------------------------
 * Device I/O access
 * --------------------------------------------------------------------- */

static inline u8 vt1211_read8(struct vt1211_data *data, u8 reg)
{
	return inb(data->addr + reg);
}

static inline void vt1211_write8(struct vt1211_data *data, u8 reg, u8 val)
{
	outb(val, data->addr + reg);
}

static struct vt1211_data *vt1211_update_device(struct device *dev)
{
	struct vt1211_data *data = dev_get_drvdata(dev);
	int ix, val;

	mutex_lock(&data->update_lock);

	/* registers cache is refreshed after 1 second */
	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		/* read VID */
		data->vid = vt1211_read8(data, VT1211_REG_VID) & 0x1f;

		/* voltage (in) registers */
		for (ix = 0; ix < ARRAY_SIZE(data->in); ix++) {
			if (ISVOLT(ix, data->uch_config)) {
				data->in[ix] = vt1211_read8(data,
						VT1211_REG_IN(ix));
				data->in_min[ix] = vt1211_read8(data,
						VT1211_REG_IN_MIN(ix));
				data->in_max[ix] = vt1211_read8(data,
						VT1211_REG_IN_MAX(ix));
			}
		}

		/* temp registers */
		for (ix = 0; ix < ARRAY_SIZE(data->temp); ix++) {
			if (ISTEMP(ix, data->uch_config)) {
				data->temp[ix] = vt1211_read8(data,
						regtemp[ix]);
				data->temp_max[ix] = vt1211_read8(data,
						regtempmax[ix]);
				data->temp_hyst[ix] = vt1211_read8(data,
						regtemphyst[ix]);
			}
		}

		/* fan & pwm registers */
		for (ix = 0; ix < ARRAY_SIZE(data->fan); ix++) {
			data->fan[ix] = vt1211_read8(data,
						VT1211_REG_FAN(ix));
			data->fan_min[ix] = vt1211_read8(data,
						VT1211_REG_FAN_MIN(ix));
			data->pwm[ix] = vt1211_read8(data,
						VT1211_REG_PWM(ix));
		}
		val = vt1211_read8(data, VT1211_REG_FAN_DIV);
		data->fan_div[0] = (val >> 4) & 3;
		data->fan_div[1] = (val >> 6) & 3;
		data->fan_ctl = val & 0xf;

		val = vt1211_read8(data, VT1211_REG_PWM_CTL);
		data->pwm_ctl[0] = val & 0xf;
		data->pwm_ctl[1] = (val >> 4) & 0xf;

		data->pwm_clk = vt1211_read8(data, VT1211_REG_PWM_CLK);

		/* pwm & temp auto point registers */
		data->pwm_auto_pwm[0][1] = vt1211_read8(data,
						VT1211_REG_PWM_AUTO_PWM(0, 1));
		data->pwm_auto_pwm[0][2] = vt1211_read8(data,
						VT1211_REG_PWM_AUTO_PWM(0, 2));
		data->pwm_auto_pwm[1][1] = vt1211_read8(data,
						VT1211_REG_PWM_AUTO_PWM(1, 1));
		data->pwm_auto_pwm[1][2] = vt1211_read8(data,
						VT1211_REG_PWM_AUTO_PWM(1, 2));
		for (ix = 0; ix < ARRAY_SIZE(data->pwm_auto_temp); ix++) {
			data->pwm_auto_temp[ix] = vt1211_read8(data,
						VT1211_REG_PWM_AUTO_TEMP(ix));
		}

		/* alarm registers */
		data->alarms = (vt1211_read8(data, VT1211_REG_ALARM2) << 8) |
				vt1211_read8(data, VT1211_REG_ALARM1);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

/* ---------------------------------------------------------------------
 * Voltage sysfs interfaces
 * ix = [0-5]
 * --------------------------------------------------------------------- */

#define SHOW_IN_INPUT	0
#define SHOW_SET_IN_MIN	1
#define SHOW_SET_IN_MAX	2
#define SHOW_IN_ALARM	3

static ssize_t show_in(struct device *dev, struct device_attribute *attr,
		       char *buf)
{
	struct vt1211_data *data = vt1211_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr_2 =
						to_sensor_dev_attr_2(attr);
	int ix = sensor_attr_2->index;
	int fn = sensor_attr_2->nr;
	int res;

	switch (fn) {
	case SHOW_IN_INPUT:
		res = IN_FROM_REG(ix, data->in[ix]);
		break;
	case SHOW_SET_IN_MIN:
		res = IN_FROM_REG(ix, data->in_min[ix]);
		break;
	case SHOW_SET_IN_MAX:
		res = IN_FROM_REG(ix, data->in_max[ix]);
		break;
	case SHOW_IN_ALARM:
		res = (data->alarms >> bitalarmin[ix]) & 1;
		break;
	default:
		res = 0;
		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
	}

	return sprintf(buf, "%d\n", res);
}

static ssize_t set_in(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct vt1211_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sensor_attr_2 =
						to_sensor_dev_attr_2(attr);
	int ix = sensor_attr_2->index;
	int fn = sensor_attr_2->nr;
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	switch (fn) {
	case SHOW_SET_IN_MIN:
		data->in_min[ix] = IN_TO_REG(ix, val);
		vt1211_write8(data, VT1211_REG_IN_MIN(ix), data->in_min[ix]);
		break;
	case SHOW_SET_IN_MAX:
		data->in_max[ix] = IN_TO_REG(ix, val);
		vt1211_write8(data, VT1211_REG_IN_MAX(ix), data->in_max[ix]);
		break;
	default:
		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
	}
	mutex_unlock(&data->update_lock);

	return count;
}

/* ---------------------------------------------------------------------
 * Temperature sysfs interfaces
 * ix = [0-6]
 * --------------------------------------------------------------------- */

#define SHOW_TEMP_INPUT		0
#define SHOW_SET_TEMP_MAX	1
#define SHOW_SET_TEMP_MAX_HYST	2
#define SHOW_TEMP_ALARM		3

static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct vt1211_data *data = vt1211_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr_2 =
						to_sensor_dev_attr_2(attr);
	int ix = sensor_attr_2->index;
	int fn = sensor_attr_2->nr;
	int res;

	switch (fn) {
	case SHOW_TEMP_INPUT:
		res = TEMP_FROM_REG(ix, data->temp[ix]);
		break;
	case SHOW_SET_TEMP_MAX:
		res = TEMP_FROM_REG(ix, data->temp_max[ix]);
		break;
	case SHOW_SET_TEMP_MAX_HYST:
		res = TEMP_FROM_REG(ix, data->temp_hyst[ix]);
		break;
	case SHOW_TEMP_ALARM:
		res = (data->alarms >> bitalarmtemp[ix]) & 1;
		break;
	default:
		res = 0;
		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);
	}

	return sprintf(buf, "%d\n", res);
}

static ssize_t set_temp(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct vt1211_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sensor_attr_2 =
						to_sensor_dev_attr_2(attr);
	int ix = sensor_attr_2->index;
	int fn = sensor_attr_2->nr;
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	switch (fn) {
	case SHOW_SET_TEMP_MAX:
		data->temp_max[ix] = TEMP_TO_REG(ix, val);
		vt1211_write8(data, regtempmax[ix],
			      data->temp_max[ix]);
		break;
	case SHOW_SET_TEMP_MAX_HYST:
		data->temp_hyst[ix] = TEMP_TO_REG(ix, val);
		vt1211_write8(data, regtemphyst[ix],
			      data->temp_hyst[ix]);
		break;
	default:
		dev_dbg(dev, "Unknown attr fetch (%d)\n", fn);