lm87.c

h内核

/*
 * lm87.c
 *
 * Copyright (C) 2000       Frodo Looijaard <[e-mail]>
 *                          Philip Edelbrock <[e-mail]>
 *                          Stephen Rousset <[e-mail]>
 *                          Dan Eaton <[e-mail]>
 * Copyright (C) 2004       Jean Delvare <[e-mail]>
 *
 * Original port to Linux 2.6 by Jeff Oliver.
 *
 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
 * to 8 voltages (including its own power source), up to three temperatures
 * (its own plus up to two external ones) and up to two fans. The default
 * configuration is 6 voltages, two temperatures and two fans (see below).
 * Voltages are scaled internally with ratios such that the nominal value of
 * each voltage correspond to a register value of 192 (which means a
 * resolution of about 0.5% of the nominal value). Temperature values are
 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
 * datasheet can be obtained from National's website at:
 *   http://www.national.com/pf/LM/LM87.html
 *
 * Some functions share pins, so not all functions are available at the same
 * time. Which are depends on the hardware setup. This driver assumes that
 * the BIOS configured the chip correctly. In that respect, it  differs from
 * the original driver (from lm_sensors for Linux 2.4), which would force the
 * LM87 to an arbitrary, compile-time chosen mode, regardless of the actual
 * chipset wiring.
 * For reference, here is the list of exclusive functions:
 *  - in0+in5 (default) or temp3
 *  - fan1 (default) or in6
 *  - fan2 (default) or in7
 *  - VID lines (default) or IRQ lines (not handled by this driver)
 *
 * The LM87 additionally features an analog output, supposedly usable to
 * control the speed of a fan. All new chips use pulse width modulation
 * instead. The LM87 is the only hardware monitoring chipset I know of
 * which uses amplitude modulation. Be careful when using this feature.
 *
 * 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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/i2c-sensor.h>
#include <linux/i2c-vid.h>

/*
 * Addresses to scan
 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
 */

static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };

/*
 * Insmod parameters
 */

SENSORS_INSMOD_1(lm87);

/*
 * The LM87 registers
 */

/* nr in 0..5 */
#define LM87_REG_IN(nr)			(0x20 + (nr))
#define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
#define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
/* nr in 0..1 */
#define LM87_REG_AIN(nr)		(0x28 + (nr))
#define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
#define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))

static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };

#define LM87_REG_TEMP_HW_INT_LOCK	0x13
#define LM87_REG_TEMP_HW_EXT_LOCK	0x14
#define LM87_REG_TEMP_HW_INT		0x17
#define LM87_REG_TEMP_HW_EXT		0x18

/* nr in 0..1 */
#define LM87_REG_FAN(nr)		(0x28 + (nr))
#define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
#define LM87_REG_AOUT			0x19

#define LM87_REG_CONFIG			0x40
#define LM87_REG_CHANNEL_MODE		0x16
#define LM87_REG_VID_FAN_DIV		0x47
#define LM87_REG_VID4			0x49

#define LM87_REG_ALARMS1		0x41
#define LM87_REG_ALARMS2		0x42

#define LM87_REG_COMPANY_ID		0x3E
#define LM87_REG_REVISION		0x3F

/*
 * Conversions and various macros
 * The LM87 uses signed 8-bit values for temperatures.
 */

#define IN_FROM_REG(reg,scale)	(((reg) * (scale) + 96) / 192)
#define IN_TO_REG(val,scale)	((val) <= 0 ? 0 : \
				 (val) * 192 >= (scale) * 255 ? 255 : \
				 ((val) * 192 + (scale)/2) / (scale))

#define TEMP_FROM_REG(reg)	((reg) * 1000)
#define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
				 (val) >= 126500 ? 127 : \
				 (((val) < 0 ? (val)-500 : (val)+500) / 1000))

#define FAN_FROM_REG(reg,div)	((reg) == 255 || (reg) == 0 ? 0 : \
				 1350000 + (reg)*(div) / 2) / ((reg)*(div))
#define FAN_TO_REG(val,div)	((val)*(div) * 255 <= 1350000 ? 255 : \
				 (1350000 + (val)*(div) / 2) / ((val)*(div)))

#define FAN_DIV_FROM_REG(reg)	(1 << (reg))

/* analog out is 9.80mV/LSB */
#define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
#define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 2500 ? 255 : \
				 ((val) * 10 + 49) / 98)

/* nr in 0..1 */
#define CHAN_NO_FAN(nr)		(1 << (nr))
#define CHAN_TEMP3		(1 << 2)
#define CHAN_VCC_5V		(1 << 3)
#define CHAN_NO_VID		(1 << 8)

/*
 * Functions declaration
 */

static int lm87_attach_adapter(struct i2c_adapter *adapter);
static int lm87_detect(struct i2c_adapter *adapter, int address, int kind);
static void lm87_init_client(struct i2c_client *client);
static int lm87_detach_client(struct i2c_client *client);
static struct lm87_data *lm87_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */

static struct i2c_driver lm87_driver = {
	.owner		= THIS_MODULE,
	.name		= "lm87",
	.id		= I2C_DRIVERID_LM87,
	.flags		= I2C_DF_NOTIFY,
	.attach_adapter	= lm87_attach_adapter,
	.detach_client	= lm87_detach_client,
};

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

struct lm87_data {
	struct i2c_client client;
	struct semaphore update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* In jiffies */

	u8 channel;		/* register value */

	u8 in[8];		/* register value */
	u8 in_max[8];		/* register value */
	u8 in_min[8];		/* register value */
	u16 in_scale[8];

	s8 temp[3];		/* register value */
	s8 temp_high[3];	/* register value */
	s8 temp_low[3];		/* register value */
	s8 temp_crit_int;	/* min of two register values */
	s8 temp_crit_ext;	/* min of two register values */

	u8 fan[2];		/* register value */
	u8 fan_min[2];		/* register value */
	u8 fan_div[2];		/* register value, shifted right */
	u8 aout;		/* register value */

	u16 alarms;		/* register values, combined */
	u8 vid;			/* register values, combined */
	u8 vrm;
};

/*
 * Internal variables
 */

static int lm87_id;

/*
 * Sysfs stuff
 */

static inline int lm87_read_value(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

#define show_in(offset) \
static ssize_t show_in##offset##_input(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
		       data->in_scale[offset])); \
} \
static ssize_t show_in##offset##_min(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
		       data->in_scale[offset])); \
} \
static ssize_t show_in##offset##_max(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
		       data->in_scale[offset])); \
} \
static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
		show_in##offset##_input, NULL);
show_in(0);
show_in(1);
show_in(2);
show_in(3);
show_in(4);
show_in(5);
show_in(6);
show_in(7);

static void set_in_min(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
			 LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
}

static void set_in_max(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
			 LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
}

#define set_in(offset) \
static ssize_t set_in##offset##_min(struct device *dev, \
		const char *buf, size_t count) \
{ \
	set_in_min(dev, buf, offset); \
	return count; \
} \
static ssize_t set_in##offset##_max(struct device *dev, \
		const char *buf, size_t count) \
{ \
	set_in_max(dev, buf, offset); \
	return count; \
} \
static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
		show_in##offset##_min, set_in##offset##_min); \
static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
		show_in##offset##_max, set_in##offset##_max);
set_in(0);
set_in(1);
set_in(2);
set_in(3);
set_in(4);
set_in(5);
set_in(6);
set_in(7);

#define show_temp(offset) \
static ssize_t show_temp##offset##_input(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
} \
static ssize_t show_temp##offset##_low(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
} \
static ssize_t show_temp##offset##_high(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
}\
static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
		show_temp##offset##_input, NULL);
show_temp(1);
show_temp(2);
show_temp(3);

static void set_temp_low(struct device *dev, const char *buf, int nr)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct lm87_data *data = i2c_get_clientdata(client);
    long val = simple_strtol(buf, NULL, 10);
    data->temp_low[nr] = TEMP_TO_REG(val);
    lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
}

static void set_temp_high(struct device *dev, const char *buf, int nr)
{
    struct i2c_client *client = to_i2c_client(dev);
    struct lm87_data *data = i2c_get_clientdata(client);
    long val = simple_strtol(buf, NULL, 10);
    data->temp_high[nr] = TEMP_TO_REG(val);
    lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
}

#define set_temp(offset) \
static ssize_t set_temp##offset##_low(struct device *dev, \
		const char *buf, size_t count) \
{ \
	set_temp_low(dev, buf, offset-1); \
	return count; \
} \
static ssize_t set_temp##offset##_high(struct device *dev, \
		const char *buf, size_t count) \
{ \
	set_temp_high(dev, buf, offset-1); \
	return count; \
} \
static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
		show_temp##offset##_high, set_temp##offset##_high); \
static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
		show_temp##offset##_low, set_temp##offset##_low);
set_temp(1);
set_temp(2);
set_temp(3);

static ssize_t show_temp_crit_int(struct device *dev, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
}

static ssize_t show_temp_crit_ext(struct device *dev, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
}

static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);

#define show_fan(offset) \
static ssize_t show_fan##offset##_input(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
} \
static ssize_t show_fan##offset##_min(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
} \
static ssize_t show_fan##offset##_div(struct device *dev, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
} \
static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
		show_fan##offset##_input, NULL);
show_fan(1);
show_fan(2);

static void set_fan_min(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	data->fan_min[nr] = FAN_TO_REG(val,
			    FAN_DIV_FROM_REG(data->fan_div[nr]));