w83793.c

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/*
    w83793.c - Linux kernel driver for hardware monitoring
    Copyright (C) 2006 Winbond Electronics Corp.
                  Yuan Mu
                  Rudolf Marek <[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 - version 2.

    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., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301 USA.
*/

/*
    Supports following chips:

    Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
    w83793	10	12	8	6	0x7b	0x5ca3	yes	no
*/

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

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(w83793);
I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
		       "{bus, clientaddr, subclientaddr1, subclientaddr2}");

static int reset;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");

/*
   Address 0x00, 0x0d, 0x0e, 0x0f in all three banks are reserved
   as ID, Bank Select registers
*/
#define W83793_REG_BANKSEL		0x00
#define W83793_REG_VENDORID		0x0d
#define W83793_REG_CHIPID		0x0e
#define W83793_REG_DEVICEID		0x0f

#define W83793_REG_CONFIG		0x40
#define W83793_REG_MFC			0x58
#define W83793_REG_FANIN_CTRL		0x5c
#define W83793_REG_FANIN_SEL		0x5d
#define W83793_REG_I2C_ADDR		0x0b
#define W83793_REG_I2C_SUBADDR		0x0c
#define W83793_REG_VID_INA		0x05
#define W83793_REG_VID_INB		0x06
#define W83793_REG_VID_LATCHA		0x07
#define W83793_REG_VID_LATCHB		0x08
#define W83793_REG_VID_CTRL		0x59

static u16 W83793_REG_TEMP_MODE[2] = { 0x5e, 0x5f };

#define TEMP_READ	0
#define TEMP_CRIT	1
#define TEMP_CRIT_HYST	2
#define TEMP_WARN	3
#define TEMP_WARN_HYST	4
/* only crit and crit_hyst affect real-time alarm status
   current crit crit_hyst warn warn_hyst */
static u16 W83793_REG_TEMP[][5] = {
	{0x1c, 0x78, 0x79, 0x7a, 0x7b},
	{0x1d, 0x7c, 0x7d, 0x7e, 0x7f},
	{0x1e, 0x80, 0x81, 0x82, 0x83},
	{0x1f, 0x84, 0x85, 0x86, 0x87},
	{0x20, 0x88, 0x89, 0x8a, 0x8b},
	{0x21, 0x8c, 0x8d, 0x8e, 0x8f},
};

#define W83793_REG_TEMP_LOW_BITS	0x22

#define W83793_REG_BEEP(index)		(0x53 + (index))
#define W83793_REG_ALARM(index)		(0x4b + (index))

#define W83793_REG_CLR_CHASSIS		0x4a	/* SMI MASK4 */
#define W83793_REG_IRQ_CTRL		0x50
#define W83793_REG_OVT_CTRL		0x51
#define W83793_REG_OVT_BEEP		0x52

#define IN_READ				0
#define IN_MAX				1
#define IN_LOW				2
static const u16 W83793_REG_IN[][3] = {
	/* Current, High, Low */
	{0x10, 0x60, 0x61},	/* Vcore A	*/
	{0x11, 0x62, 0x63},	/* Vcore B	*/
	{0x12, 0x64, 0x65},	/* Vtt		*/
	{0x14, 0x6a, 0x6b},	/* VSEN1	*/
	{0x15, 0x6c, 0x6d},	/* VSEN2	*/
	{0x16, 0x6e, 0x6f},	/* +3VSEN	*/
	{0x17, 0x70, 0x71},	/* +12VSEN	*/
	{0x18, 0x72, 0x73},	/* 5VDD		*/
	{0x19, 0x74, 0x75},	/* 5VSB		*/
	{0x1a, 0x76, 0x77},	/* VBAT		*/
};

/* Low Bits of Vcore A/B Vtt Read/High/Low */
static const u16 W83793_REG_IN_LOW_BITS[] = { 0x1b, 0x68, 0x69 };
static u8 scale_in[] = { 2, 2, 2, 16, 16, 16, 8, 24, 24, 16 };
static u8 scale_in_add[] = { 0, 0, 0, 0, 0, 0, 0, 150, 150, 0 };

#define W83793_REG_FAN(index)		(0x23 + 2 * (index))	/* High byte */
#define W83793_REG_FAN_MIN(index)	(0x90 + 2 * (index))	/* High byte */

#define W83793_REG_PWM_DEFAULT		0xb2
#define W83793_REG_PWM_ENABLE		0x207
#define W83793_REG_PWM_UPTIME		0xc3	/* Unit in 0.1 second */
#define W83793_REG_PWM_DOWNTIME		0xc4	/* Unit in 0.1 second */
#define W83793_REG_TEMP_CRITICAL	0xc5

#define PWM_DUTY			0
#define PWM_START			1
#define PWM_NONSTOP			2
#define W83793_REG_PWM(index, nr)	(((nr) == 0 ? 0xb3 : \
					 (nr) == 1 ? 0x220 : 0x218) + (index))

/* bit field, fan1 is bit0, fan2 is bit1 ... */
#define W83793_REG_TEMP_FAN_MAP(index)	(0x201 + (index))
#define W83793_REG_TEMP_TOL(index)	(0x208 + (index))
#define W83793_REG_TEMP_CRUISE(index)	(0x210 + (index))
#define W83793_REG_PWM_STOP_TIME(index)	(0x228 + (index))
#define W83793_REG_SF2_TEMP(index, nr)	(0x230 + ((index) << 4) + (nr))
#define W83793_REG_SF2_PWM(index, nr)	(0x238 + ((index) << 4) + (nr))

static inline unsigned long FAN_FROM_REG(u16 val)
{
	if ((val >= 0xfff) || (val == 0))
		return	0;
	return (1350000UL / val);
}

static inline u16 FAN_TO_REG(long rpm)
{
	if (rpm <= 0)
		return 0x0fff;
	return SENSORS_LIMIT((1350000 + (rpm >> 1)) / rpm, 1, 0xffe);
}

static inline unsigned long TIME_FROM_REG(u8 reg)
{
	return (reg * 100);
}

static inline u8 TIME_TO_REG(unsigned long val)
{
	return SENSORS_LIMIT((val + 50) / 100, 0, 0xff);
}

static inline long TEMP_FROM_REG(s8 reg)
{
	return (reg * 1000);
}

static inline s8 TEMP_TO_REG(long val, s8 min, s8 max)
{
	return SENSORS_LIMIT((val + (val < 0 ? -500 : 500)) / 1000, min, max);
}

struct w83793_data {
	struct i2c_client client;
	struct i2c_client *lm75[2];
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */
	unsigned long last_nonvolatile;	/* In jiffies, last time we update the
					   nonvolatile registers */

	u8 bank;
	u8 vrm;
	u8 vid[2];
	u8 in[10][3];		/* Register value, read/high/low */
	u8 in_low_bits[3];	/* Additional resolution for VCore A/B Vtt */

	u16 has_fan;		/* Only fan1- fan5 has own pins */
	u16 fan[12];		/* Register value combine */
	u16 fan_min[12];	/* Register value combine */

	s8 temp[6][5];		/* current, crit, crit_hyst,warn, warn_hyst */
	u8 temp_low_bits;	/* Additional resolution TD1-TD4 */
	u8 temp_mode[2];	/* byte 0: Temp D1-D4 mode each has 2 bits
				   byte 1: Temp R1,R2 mode, each has 1 bit */
	u8 temp_critical;	/* If reached all fan will be at full speed */
	u8 temp_fan_map[6];	/* Temp controls which pwm fan, bit field */

	u8 has_pwm;
	u8 has_temp;
	u8 has_vid;
	u8 pwm_enable;		/* Register value, each Temp has 1 bit */
	u8 pwm_uptime;		/* Register value */
	u8 pwm_downtime;	/* Register value */
	u8 pwm_default;		/* All fan default pwm, next poweron valid */
	u8 pwm[8][3];		/* Register value */
	u8 pwm_stop_time[8];
	u8 temp_cruise[6];

	u8 alarms[5];		/* realtime status registers */
	u8 beeps[5];
	u8 beep_enable;
	u8 tolerance[3];	/* Temp tolerance(Smart Fan I/II) */
	u8 sf2_pwm[6][7];	/* Smart FanII: Fan duty cycle */
	u8 sf2_temp[6][7];	/* Smart FanII: Temp level point */
};

static u8 w83793_read_value(struct i2c_client *client, u16 reg);
static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);
static int w83793_attach_adapter(struct i2c_adapter *adapter);
static int w83793_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83793_detach_client(struct i2c_client *client);
static void w83793_init_client(struct i2c_client *client);
static void w83793_update_nonvolatile(struct device *dev);
static struct w83793_data *w83793_update_device(struct device *dev);

static struct i2c_driver w83793_driver = {
	.driver = {
		   .name = "w83793",
	},
	.attach_adapter = w83793_attach_adapter,
	.detach_client = w83793_detach_client,
};

static ssize_t
show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);

	return sprintf(buf, "%d\n", data->vrm);
}

static ssize_t
show_vid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83793_data *data = w83793_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int index = sensor_attr->index;

	return sprintf(buf, "%d\n", vid_from_reg(data->vid[index], data->vrm));
}

static ssize_t
store_vrm(struct device *dev, struct device_attribute *attr,
	  const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);

	data->vrm = simple_strtoul(buf, NULL, 10);
	return count;
}

#define ALARM_STATUS			0
#define BEEP_ENABLE			1
static ssize_t
show_alarm_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83793_data *data = w83793_update_device(dev);
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index >> 3;
	int bit = sensor_attr->index & 0x07;
	u8 val;

	if (ALARM_STATUS == nr) {
		val = (data->alarms[index] >> (bit)) & 1;
	} else {		/* BEEP_ENABLE */
		val = (data->beeps[index] >> (bit)) & 1;
	}

	return sprintf(buf, "%u\n", val);
}

static ssize_t
store_beep(struct device *dev, struct device_attribute *attr,
	   const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int index = sensor_attr->index >> 3;
	int shift = sensor_attr->index & 0x07;
	u8 beep_bit = 1 << shift;
	u8 val;

	val = simple_strtoul(buf, NULL, 10);
	if (val != 0 && val != 1)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->beeps[index] = w83793_read_value(client, W83793_REG_BEEP(index));
	data->beeps[index] &= ~beep_bit;
	data->beeps[index] |= val << shift;
	w83793_write_value(client, W83793_REG_BEEP(index), data->beeps[index]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_beep_enable(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83793_data *data = w83793_update_device(dev);
	return sprintf(buf, "%u\n", (data->beep_enable >> 1) & 0x01);
}

static ssize_t
store_beep_enable(struct device *dev, struct device_attribute *attr,
		  const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);
	u8 val = simple_strtoul(buf, NULL, 10);

	if (val != 0 && val != 1)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->beep_enable = w83793_read_value(client, W83793_REG_OVT_BEEP)
			    & 0xfd;
	data->beep_enable |= val << 1;
	w83793_write_value(client, W83793_REG_OVT_BEEP, data->beep_enable);
	mutex_unlock(&data->update_lock);

	return count;
}

/* Write any value to clear chassis alarm */
static ssize_t
store_chassis_clear(struct device *dev,
		    struct device_attribute *attr, const char *buf,
		    size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);
	u8 val;

	mutex_lock(&data->update_lock);
	val = w83793_read_value(client, W83793_REG_CLR_CHASSIS);
	val |= 0x80;
	w83793_write_value(client, W83793_REG_CLR_CHASSIS, val);
	mutex_unlock(&data->update_lock);
	return count;
}

#define FAN_INPUT			0
#define FAN_MIN				1
static ssize_t
show_fan(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct w83793_data *data = w83793_update_device(dev);
	u16 val;

	if (FAN_INPUT == nr) {
		val = data->fan[index] & 0x0fff;
	} else {
		val = data->fan_min[index] & 0x0fff;
	}

	return sprintf(buf, "%lu\n", FAN_FROM_REG(val));
}

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	int index = sensor_attr->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83793_data *data = i2c_get_clientdata(client);
	u16 val = FAN_TO_REG(simple_strtoul(buf, NULL, 10));

	mutex_lock(&data->update_lock);
	data->fan_min[index] = val;
	w83793_write_value(client, W83793_REG_FAN_MIN(index),
			   (val >> 8) & 0xff);
	w83793_write_value(client, W83793_REG_FAN_MIN(index) + 1, val & 0xff);
	mutex_unlock(&data->update_lock);

	return count;
}

#define PWM_DUTY			0
#define PWM_START			1
#define PWM_NONSTOP			2
#define PWM_STOP_TIME			3
static ssize_t
show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr =
	    to_sensor_dev_attr_2(attr);
	struct w83793_data *data = w83793_update_device(dev);
	u16 val;
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;

	if (PWM_STOP_TIME == nr)
		val = TIME_FROM_REG(data->pwm_stop_time[index]);
	else