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lm-sensors/kernel/chips/it87.c
T
Mark D. Studebaker 34076ded72 pwm and smart guardian fan patch from 
Michael Hufer <michael.hufer@freenet.de>

------------------------

> First, I added a new mod parameter "reset_it87" which controls whether
> or not the chip is reset on module load (modprobe it87 reset_it=1,
> default) or not(modprobe it87 reset_it87=0).
> Since this worked out quiet nicely I decided to go one step further
> and also add the chips manual and automatic temperature controlled fan
> speed features (PWM etc.).
>
> Finally I also updated the doc to document the new features.
>
> Attached is a diff against the current cvs version.

------------------------
           Subject:
            Re: fan speed for it87?? chips added
      Date:
            Fri, 26 Sep 2003 23:28:35 +0200
      From:
            Michael Hufer <michael.hufer@freenet.de>
        To:
            sensors@Stimpy.netroedge.com, Jean Delvare <khali@linux-fr.org>

On Friday 26 September 2003 22:40, Jean Delvare wrote:
> > I found and fixed the little problem I had with the original chip
> > initialization. I can now load the module with reset_it87=0 and
> > init=1 without messing up the settings of the power supply fan
> > from the BIOS. It was quite simple after all.
>
> I'm interested in details, can you tell us what it was?

Sure, it actually was something I introduced myself :-(. I initialized the
fan_ctl register with  (read_value & 0x8f | 0x77) to enable the smart
guardian feature for all 3 fans. But the power supply fan does not support
pwm. It can only be operated in on/off mode, i.e. bit 0 must be clear. I
switched it back to the original  (rv & 0x8f | 0x70 ) and everything is back
to working.

> > Do you want me to send the latest diff?
>
> Sure I want.

 Here it comes.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2033 7894878c-1315-0410-8ee3-d5d059ff63e0
2003-10-28 02:20:31 +00:00

1113 lines
37 KiB
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/*
it87.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring.
Supports: IT8705F Super I/O chip w/LPC interface
IT8712F Super I/O chup w/LPC interface & SMbus
Sis950 A clone of the IT8705F
Copyright (c) 2001 Chris Gauthron <chrisg@0-in.com>
Largely inspired by lm78.c of the same package
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.
*/
/*
djg@pdp8.net David Gesswein 7/18/01
Modified to fix bug with not all alarms enabled.
Added ability to read battery voltage and select temperature sensor
type at module load time.
*/
/*
michael.hufer@gmx.de Michael Hufer 09/07/03
Modified configure (enable/disable) chip reset at module load time.
Added ability to read and set fan pwm registers and the smart
guardian (sg) features of the chip.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/sysctl.h>
#include <linux/types.h>
#include <linux/i2c.h>
#include <linux/i2c-proc.h>
#include <linux/init.h>
#include <asm/errno.h>
#include <asm/io.h>
#include "version.h"
MODULE_LICENSE("GPL");
/* Addresses to scan */
static unsigned short normal_i2c[] = { SENSORS_I2C_END };
static unsigned short normal_i2c_range[] = { 0x20, 0x2f, SENSORS_I2C_END };
static unsigned int normal_isa[] = { 0x0290, SENSORS_ISA_END };
static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
/* Insmod parameters */
SENSORS_INSMOD_4(it87, it8705, it8712, sis950);
/* Update battery voltage after every reading if true */
static int update_vbat = 0;
/* Enable Temp1 as thermal resistor */
/* Enable Temp2 as thermal diode */
/* Enable Temp3 as thermal resistor */
static int temp_type = 0x2a;
/* Reset the registers on init */
static int reset_it87 = 0;
/* Initialize the registers to default values on init */
static int init = 1;
/* Many IT87 constants specified below */
/* Length of ISA address segment */
#define IT87_EXTENT 8
/* Where are the ISA address/data registers relative to the base address */
#define IT87_ADDR_REG_OFFSET 5
#define IT87_DATA_REG_OFFSET 6
/*----- The IT87 registers -----*/
#define IT87_REG_CONFIG 0x00
#define IT87_REG_ALARM1 0x01
#define IT87_REG_ALARM2 0x02
#define IT87_REG_ALARM3 0x03
#define IT87_REG_VID 0x0a
#define IT87_REG_FAN_DIV 0x0b
#define IT87_REG_FAN(nr) (0x0c + (nr))
#define IT87_REG_FAN_MIN(nr) (0x0f + (nr))
#define IT87_REG_FAN_CTRL 0x13
/* pwm and smart guardian registers */
#define IT87_REG_FAN_ONOFF 0x14
#define IT87_REG_PWM(nr) (0x14 + (nr))
#define IT87_REG_SG_TL_OFF(nr) (0x58 + (nr)*8)
#define IT87_REG_SG_TL_LOW(nr) (0x59 + (nr)*8)
#define IT87_REG_SG_TL_MED(nr) (0x5a + (nr)*8)
#define IT87_REG_SG_TL_HI(nr) (0x5b + (nr)*8)
#define IT87_REG_SG_TL_OVR(nr) (0x5c + (nr)*8)
#define IT87_REG_SG_PWM_LOW(nr) (0x5d + (nr)*8)
#define IT87_REG_SG_PWM_MED(nr) (0x5e + (nr)*8)
#define IT87_REG_SG_PWM_HI(nr) (0x5f + (nr)*8)
/* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
#define IT87_REG_VIN(nr) (0x20 + (nr))
#define IT87_REG_TEMP(nr) (0x28 + (nr))
#define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2)
#define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2)
#define IT87_REG_TEMP_HIGH(nr) (0x3e + (nr) * 2)
#define IT87_REG_TEMP_LOW(nr) (0x3f + (nr) * 2)
#define IT87_REG_I2C_ADDR 0x48
#define IT87_REG_VIN_ENABLE 0x50
#define IT87_REG_TEMP_ENABLE 0x51
#define IT87_REG_CHIPID 0x58
/* Conversions. Rounding and limit checking is only done on the TO_REG
variants. Note that you should be a bit careful with which arguments
these macros are called: arguments may be evaluated more than once.
Fixing this is just not worth it. */
#define IN_TO_REG(val) (SENSORS_LIMIT((((val) * 10 + 8)/16),0,255))
#define IN_FROM_REG(val) (((val) * 16) / 10)
static inline u8 FAN_TO_REG(long rpm, int div)
{
if (rpm == 0)
return 255;
rpm = SENSORS_LIMIT(rpm, 1, 1000000);
return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
254);
}
#define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
#define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-5)/10):\
((val)+5)/10),0,255))
#define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*10)
#define VID_FROM_REG(val) ((val)==0x1f?0:(val)>=0x10?510-(val)*10:\
205-(val)*5)
#define ALARMS_FROM_REG(val) (val)
extern inline u8 DIV_TO_REG(long val)
{
u8 i;
for( i = 0; i <= 7; i++ )
{
if( val>>i == 1 )
return i;
}
return 1;
}
/*#define DIV_TO_REG(val) ((val)==8?3:(val)==4?2:(val)==1?0:1)*/
#define DIV_FROM_REG(val) (1 << (val))
/* Initial limits. Use the config file to set better limits. */
#define IT87_INIT_IN_0 170
#define IT87_INIT_IN_1 250
#define IT87_INIT_IN_2 (330 / 2)
#define IT87_INIT_IN_3 (((500) * 100)/168)
#define IT87_INIT_IN_4 (((1200) * 10)/38)
#define IT87_INIT_IN_5 (((1200) * 10)/72)
#define IT87_INIT_IN_6 (((500) * 10)/56)
#define IT87_INIT_IN_7 (((500) * 100)/168)
#define IT87_INIT_IN_PERCENTAGE 10
#define IT87_INIT_IN_MIN_0 \
(IT87_INIT_IN_0 - IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_0 \
(IT87_INIT_IN_0 + IT87_INIT_IN_0 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_1 \
(IT87_INIT_IN_1 - IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_1 \
(IT87_INIT_IN_1 + IT87_INIT_IN_1 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_2 \
(IT87_INIT_IN_2 - IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_2 \
(IT87_INIT_IN_2 + IT87_INIT_IN_2 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_3 \
(IT87_INIT_IN_3 - IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_3 \
(IT87_INIT_IN_3 + IT87_INIT_IN_3 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_4 \
(IT87_INIT_IN_4 - IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_4 \
(IT87_INIT_IN_4 + IT87_INIT_IN_4 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_5 \
(IT87_INIT_IN_5 - IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_5 \
(IT87_INIT_IN_5 + IT87_INIT_IN_5 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_6 \
(IT87_INIT_IN_6 - IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_6 \
(IT87_INIT_IN_6 + IT87_INIT_IN_6 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MIN_7 \
(IT87_INIT_IN_7 - IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_IN_MAX_7 \
(IT87_INIT_IN_7 + IT87_INIT_IN_7 * IT87_INIT_IN_PERCENTAGE / 100)
#define IT87_INIT_FAN_MIN_1 3000
#define IT87_INIT_FAN_MIN_2 3000
#define IT87_INIT_FAN_MIN_3 3000
#define IT87_INIT_TEMP_HIGH_1 600
#define IT87_INIT_TEMP_LOW_1 540
#define IT87_INIT_TEMP_HIGH_2 600
#define IT87_INIT_TEMP_LOW_2 200
#define IT87_INIT_TEMP_HIGH_3 600
#define IT87_INIT_TEMP_LOW_3 200
#define IT87_INIT_PWR_TL_OFF 160
#define IT87_INIT_PWR_TL_LOW 160
#define IT87_INIT_PWR_TL_MED 480
#define IT87_INIT_PWR_TL_HI 540
#define IT87_INIT_PWR_TL_OVR 580
#define IT87_INIT_PWR_LOW 3
#define IT87_INIT_PWR_MED 4
#define IT87_INIT_PWR_HI 9
/* For each registered IT87, we need to keep some data in memory. That
data is pointed to by it87_list[NR]->data. The structure itself is
dynamically allocated, at the same time when a new it87 client is
allocated. */
struct it87_data {
struct semaphore lock;
int sysctl_id;
enum chips type;
struct semaphore update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 in[9]; /* Register value */
u8 in_max[9]; /* Register value */
u8 in_min[9]; /* Register value */
u8 fan[3]; /* Register value */
u8 fan_min[3]; /* Register value */
u8 temp[3]; /* Register value */
u8 temp_high[3]; /* Register value */
u8 temp_low[3]; /* Register value */
u8 fan_div[3]; /* Register encoding, shifted right */
u8 vid; /* Register encoding, combined */
u32 alarms; /* Register encoding, combined */
u8 pwm[3]; /* Register value */
u8 fan_ctl[2]; /* Register encoding */
u8 sg_tl[3][5]; /* Register value */
u8 sg_pwm[3][3]; /* Register value */
};
static int it87_attach_adapter(struct i2c_adapter *adapter);
static int it87_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind);
static int it87_detach_client(struct i2c_client *client);
static int it87_read_value(struct i2c_client *client, u8 register);
static int it87_write_value(struct i2c_client *client, u8 register,
u8 value);
static void it87_update_client(struct i2c_client *client);
static void it87_init_client(struct i2c_client *client);
static void it87_in(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results);
static void it87_fan(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_temp(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_vid(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_alarms(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_fan_div(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_fan_ctl(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_pwm(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_sgpwm(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static void it87_sgtl(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results);
static struct i2c_driver it87_driver = {
.owner = THIS_MODULE,
.name = "IT87xx sensor driver",
.id = I2C_DRIVERID_IT87,
.flags = I2C_DF_NOTIFY,
.attach_adapter = it87_attach_adapter,
.detach_client = it87_detach_client,
};
static int it87_id = 0;
/* The /proc/sys entries */
/* -- SENSORS SYSCTL START -- */
#define IT87_SYSCTL_IN0 1000 /* Volts * 100 */
#define IT87_SYSCTL_IN1 1001
#define IT87_SYSCTL_IN2 1002
#define IT87_SYSCTL_IN3 1003
#define IT87_SYSCTL_IN4 1004
#define IT87_SYSCTL_IN5 1005
#define IT87_SYSCTL_IN6 1006
#define IT87_SYSCTL_IN7 1007
#define IT87_SYSCTL_IN8 1008
#define IT87_SYSCTL_FAN1 1101 /* Rotations/min */
#define IT87_SYSCTL_FAN2 1102
#define IT87_SYSCTL_FAN3 1103
#define IT87_SYSCTL_TEMP1 1200 /* Degrees Celcius * 10 */
#define IT87_SYSCTL_TEMP2 1201 /* Degrees Celcius * 10 */
#define IT87_SYSCTL_TEMP3 1202 /* Degrees Celcius * 10 */
#define IT87_SYSCTL_VID 1300 /* Volts * 100 */
#define IT87_SYSCTL_FAN_DIV 2000 /* 1, 2, 4 or 8 */
#define IT87_SYSCTL_ALARMS 2004 /* bitvector */
#define IT87_SYSCTL_PWM1 1401
#define IT87_SYSCTL_PWM2 1402
#define IT87_SYSCTL_PWM3 1403
#define IT87_SYSCTL_FAN_CTL 1501
#define IT87_SYSCTL_FAN_ON_OFF 1502
#define IT87_ALARM_IN0 0x000100
#define IT87_ALARM_IN1 0x000200
#define IT87_ALARM_IN2 0x000400
#define IT87_ALARM_IN3 0x000800
#define IT87_ALARM_IN4 0x001000
#define IT87_ALARM_IN5 0x002000
#define IT87_ALARM_IN6 0x004000
#define IT87_ALARM_IN7 0x008000
#define IT87_ALARM_FAN1 0x0001
#define IT87_ALARM_FAN2 0x0002
#define IT87_ALARM_FAN3 0x0004
#define IT87_ALARM_TEMP1 0x00010000
#define IT87_ALARM_TEMP2 0x00020000
#define IT87_ALARM_TEMP3 0x00040000
/* -- SENSORS SYSCTL END -- */
/* These files are created for each detected IT87. This is just a template;
though at first sight, you might think we could use a statically
allocated list, we need some way to get back to the parent - which
is done through one of the 'extra' fields which are initialized
when a new copy is allocated. */
static ctl_table it87_dir_table_template[] = {
{IT87_SYSCTL_IN0, "in0", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN1, "in1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN2, "in2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN3, "in3", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN4, "in4", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN5, "in5", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN6, "in6", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN7, "in7", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_IN8, "in8", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_in},
{IT87_SYSCTL_FAN1, "fan1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan},
{IT87_SYSCTL_FAN2, "fan2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan},
{IT87_SYSCTL_FAN3, "fan3", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan},
{IT87_SYSCTL_TEMP1, "temp1", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_temp},
{IT87_SYSCTL_TEMP2, "temp2", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_temp},
{IT87_SYSCTL_TEMP3, "temp3", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_temp},
{IT87_SYSCTL_VID, "vid", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_vid},
{IT87_SYSCTL_FAN_DIV, "fan_div", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan_div},
{IT87_SYSCTL_ALARMS, "alarms", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_alarms},
{IT87_SYSCTL_FAN_CTL, "fan_ctl", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan_ctl},
{IT87_SYSCTL_FAN_ON_OFF, "fan_on_off", NULL, 0, 0644, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_fan_ctl},
{IT87_SYSCTL_PWM1, "pwm1", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_pwm},
{IT87_SYSCTL_PWM2, "pwm2", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_pwm},
{IT87_SYSCTL_PWM3, "pwm3", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_pwm},
{IT87_SYSCTL_PWM1, "sg_pwm1", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgpwm},
{IT87_SYSCTL_PWM2, "sg_pwm2", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgpwm},
{IT87_SYSCTL_PWM3, "sg_pwm3", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgpwm},
{IT87_SYSCTL_PWM1, "sg_tl1", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgtl},
{IT87_SYSCTL_PWM2, "sg_tl2", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgtl},
{IT87_SYSCTL_PWM3, "sg_tl3", NULL, 0, 0444, NULL, &i2c_proc_real,
&i2c_sysctl_real, NULL, &it87_sgtl},
{0}
};
/* This function is called when:
* it87_driver is inserted (when this module is loaded), for each
available adapter
* when a new adapter is inserted (and it87_driver is still present) */
static int it87_attach_adapter(struct i2c_adapter *adapter)
{
return i2c_detect(adapter, &addr_data, it87_detect);
}
/* This function is called by i2c_detect */
int it87_detect(struct i2c_adapter *adapter, int address,
unsigned short flags, int kind)
{
int i;
struct i2c_client *new_client;
struct it87_data *data;
int err = 0;
const char *type_name = "";
const char *client_name = "";
int is_isa = i2c_is_isa_adapter(adapter);
if (!is_isa
&& !i2c_check_functionality(adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) goto
ERROR0;
if (is_isa) {
if (check_region(address, IT87_EXTENT))
goto ERROR0;
}
/* Probe whether there is anything available on this address. Already
done for SMBus clients */
if (kind < 0) {
if (is_isa) {
#define REALLY_SLOW_IO
/* We need the timeouts for at least some IT87-like chips. But only
if we read 'undefined' registers. */
i = inb_p(address + 1);
if (inb_p(address + 2) != i)
goto ERROR0;
if (inb_p(address + 3) != i)
goto ERROR0;
if (inb_p(address + 7) != i)
goto ERROR0;
#undef REALLY_SLOW_IO
/* Let's just hope nothing breaks here */
i = inb_p(address + 5) & 0x7f;
outb_p(~i & 0x7f, address + 5);
if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
outb_p(i, address + 5);
return 0;
}
}
}
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
But it allows us to access it87_{read,write}_value. */
if (!(new_client = kmalloc((sizeof(struct i2c_client)) +
sizeof(struct it87_data),
GFP_KERNEL))) {
err = -ENOMEM;
goto ERROR0;
}
data = (struct it87_data *) (new_client + 1);
if (is_isa)
init_MUTEX(&data->lock);
new_client->addr = address;
new_client->data = data;
new_client->adapter = adapter;
new_client->driver = &it87_driver;
new_client->flags = 0;
/* Now, we do the remaining detection. */
if (kind < 0) {
if (it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
goto ERROR1;
if (!is_isa
&& (it87_read_value(new_client, IT87_REG_I2C_ADDR) !=
address)) goto ERROR1;
}
/* Determine the chip type. */
if (kind <= 0) {
i = it87_read_value(new_client, IT87_REG_CHIPID);
if (i == 0x90) {
kind = it87;
}
else {
if (kind == 0)
printk
("it87.o: Ignoring 'force' parameter for unknown chip at "
"adapter %d, address 0x%02x\n",
i2c_adapter_id(adapter), address);
goto ERROR1;
}
}
if (kind == it87) {
type_name = "it87";
client_name = "IT87 chip";
} /* else if (kind == it8712) {
type_name = "it8712";
client_name = "IT87-J chip";
} */ else {
#ifdef DEBUG
printk("it87.o: Internal error: unknown kind (%d)?!?",
kind);
#endif
goto ERROR1;
}
/* Reserve the ISA region */
if (is_isa)
request_region(address, IT87_EXTENT, type_name);
/* Fill in the remaining client fields and put it into the global list */
strcpy(new_client->name, client_name);
data->type = kind;
new_client->id = it87_id++;
data->valid = 0;
init_MUTEX(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto ERROR3;
/* Register a new directory entry with module sensors */
if ((i = i2c_register_entry(new_client,
type_name,
it87_dir_table_template)) < 0) {
err = i;
goto ERROR4;
}
data->sysctl_id = i;
/* Initialize the IT87 chip */
it87_init_client(new_client);
return 0;
/* OK, this is not exactly good programming practice, usually. But it is
very code-efficient in this case. */
ERROR4:
i2c_detach_client(new_client);
ERROR3:
if (is_isa)
release_region(address, IT87_EXTENT);
ERROR1:
kfree(new_client);
ERROR0:
return err;
}
static int it87_detach_client(struct i2c_client *client)
{
int err;
i2c_deregister_entry(((struct it87_data *) (client->data))->
sysctl_id);
if ((err = i2c_detach_client(client))) {
printk
("it87.o: Client deregistration failed, client not detached.\n");
return err;
}
if(i2c_is_isa_client(client))
release_region(client->addr, IT87_EXTENT);
kfree(client);
return 0;
}
/* The SMBus locks itself, but ISA access must be locked explicitely!
We don't want to lock the whole ISA bus, so we lock each client
separately.
We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
would slow down the IT87 access and should not be necessary.
There are some ugly typecasts here, but the good new is - they should
nowhere else be necessary! */
static int it87_read_value(struct i2c_client *client, u8 reg)
{
int res;
if (i2c_is_isa_client(client)) {
down(&(((struct it87_data *) (client->data))->lock));
outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
up(&(((struct it87_data *) (client->data))->lock));
return res;
} else
return i2c_smbus_read_byte_data(client, reg);
}
/* The SMBus locks itself, but ISA access muse be locked explicitely!
We don't want to lock the whole ISA bus, so we lock each client
separately.
We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
would slow down the IT87 access and should not be necessary.
There are some ugly typecasts here, but the good new is - they should
nowhere else be necessary! */
static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
if (i2c_is_isa_client(client)) {
down(&(((struct it87_data *) (client->data))->lock));
outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
up(&(((struct it87_data *) (client->data))->lock));
return 0;
} else
return i2c_smbus_write_byte_data(client, reg, value);
}
/* Called when we have found a new IT87. It should set limits, etc. */
static void it87_init_client(struct i2c_client *client)
{
if( init )
{
/* Reset all except Watchdog values and last conversion values
This sets fan-divs to 2, among others.
It will also reset the automatic temperature controlled fan
speed (noise) control the BIOS configured on POST and the
fan will be set to propably noisy full speed operation */
if( reset_it87 ) {
it87_write_value(client, IT87_REG_CONFIG, 0x80);
}
it87_write_value(client, IT87_REG_VIN_MIN(0),
IN_TO_REG(IT87_INIT_IN_MIN_0));
it87_write_value(client, IT87_REG_VIN_MAX(0),
IN_TO_REG(IT87_INIT_IN_MAX_0));
it87_write_value(client, IT87_REG_VIN_MIN(1),
IN_TO_REG(IT87_INIT_IN_MIN_1));
it87_write_value(client, IT87_REG_VIN_MAX(1),
IN_TO_REG(IT87_INIT_IN_MAX_1));
it87_write_value(client, IT87_REG_VIN_MIN(2),
IN_TO_REG(IT87_INIT_IN_MIN_2));
it87_write_value(client, IT87_REG_VIN_MAX(2),
IN_TO_REG(IT87_INIT_IN_MAX_2));
it87_write_value(client, IT87_REG_VIN_MIN(3),
IN_TO_REG(IT87_INIT_IN_MIN_3));
it87_write_value(client, IT87_REG_VIN_MAX(3),
IN_TO_REG(IT87_INIT_IN_MAX_3));
it87_write_value(client, IT87_REG_VIN_MIN(4),
IN_TO_REG(IT87_INIT_IN_MIN_4));
it87_write_value(client, IT87_REG_VIN_MAX(4),
IN_TO_REG(IT87_INIT_IN_MAX_4));
it87_write_value(client, IT87_REG_VIN_MIN(5),
IN_TO_REG(IT87_INIT_IN_MIN_5));
it87_write_value(client, IT87_REG_VIN_MAX(5),
IN_TO_REG(IT87_INIT_IN_MAX_5));
it87_write_value(client, IT87_REG_VIN_MIN(6),
IN_TO_REG(IT87_INIT_IN_MIN_6));
it87_write_value(client, IT87_REG_VIN_MAX(6),
IN_TO_REG(IT87_INIT_IN_MAX_6));
it87_write_value(client, IT87_REG_VIN_MIN(7),
IN_TO_REG(IT87_INIT_IN_MIN_7));
it87_write_value(client, IT87_REG_VIN_MAX(7),
IN_TO_REG(IT87_INIT_IN_MAX_7));
/* Note: Battery voltage does not have limit registers */
it87_write_value(client, IT87_REG_FAN_MIN(1),
FAN_TO_REG(IT87_INIT_FAN_MIN_1, 2));
it87_write_value(client, IT87_REG_FAN_MIN(2),
FAN_TO_REG(IT87_INIT_FAN_MIN_2, 2));
it87_write_value(client, IT87_REG_FAN_MIN(3),
FAN_TO_REG(IT87_INIT_FAN_MIN_3, 2));
it87_write_value(client, IT87_REG_TEMP_HIGH(1),
TEMP_TO_REG(IT87_INIT_TEMP_HIGH_1));
it87_write_value(client, IT87_REG_TEMP_LOW(1),
TEMP_TO_REG(IT87_INIT_TEMP_LOW_1));
it87_write_value(client, IT87_REG_TEMP_HIGH(2),
TEMP_TO_REG(IT87_INIT_TEMP_HIGH_2));
it87_write_value(client, IT87_REG_TEMP_LOW(2),
TEMP_TO_REG(IT87_INIT_TEMP_LOW_2));
it87_write_value(client, IT87_REG_TEMP_HIGH(3),
TEMP_TO_REG(IT87_INIT_TEMP_HIGH_3));
it87_write_value(client, IT87_REG_TEMP_LOW(3),
TEMP_TO_REG(IT87_INIT_TEMP_LOW_3));
/* Enable voltage monitors */
it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
/* Enable Temp1-Temp3 */
it87_write_value(client, IT87_REG_TEMP_ENABLE,
(it87_read_value(client, IT87_REG_TEMP_ENABLE) & 0xc0)
| (temp_type & 0x3f));
/* Enable fans */
it87_write_value(client, IT87_REG_FAN_CTRL,
(it87_read_value(client, IT87_REG_FAN_CTRL) & 0x8f)
| 0x70);
}
/* Start monitoring */
it87_write_value(client, IT87_REG_CONFIG,
(it87_read_value(client, IT87_REG_CONFIG) & 0xb7)
| (update_vbat ? 0x41 : 0x01));
}
static void it87_update_client(struct i2c_client *client)
{
struct it87_data *data = client->data;
int i;
down(&data->update_lock);
if ((jiffies - data->last_updated > HZ + HZ / 2) ||
(jiffies < data->last_updated) || !data->valid) {
if (update_vbat) {
/* Cleared after each update, so reenable. Value
returned by this read will be previous value */
it87_write_value(client, IT87_REG_CONFIG,
it87_read_value(client, IT87_REG_CONFIG) | 0x40);
}
for (i = 0; i <= 7; i++) {
data->in[i] =
it87_read_value(client, IT87_REG_VIN(i));
data->in_min[i] =
it87_read_value(client, IT87_REG_VIN_MIN(i));
data->in_max[i] =
it87_read_value(client, IT87_REG_VIN_MAX(i));
}
data->in[8] =
it87_read_value(client, IT87_REG_VIN(8));
/* VBAT sensor doesn't have limit registers, set
to min and max value */
data->in_min[8] = 0;
data->in_max[8] = 255;
for (i = 1; i <= 3; i++) {
data->fan[i - 1] =
it87_read_value(client, IT87_REG_FAN(i));
data->fan_min[i - 1] =
it87_read_value(client, IT87_REG_FAN_MIN(i));
}
for (i = 1; i <= 3; i++) {
data->temp[i - 1] =
it87_read_value(client, IT87_REG_TEMP(i));
data->temp_high[i - 1] =
it87_read_value(client, IT87_REG_TEMP_HIGH(i));
data->temp_low[i - 1] =
it87_read_value(client, IT87_REG_TEMP_LOW(i));
}
/* The 8705 does not have VID capability */
/*if (data->type == it8712) {
data->vid = it87_read_value(client, IT87_REG_VID);
data->vid &= 0x1f;
}
else */ {
data->vid = 0x1f;
}
i = it87_read_value(client, IT87_REG_FAN_DIV);
data->fan_div[0] = i & 0x07;
data->fan_div[1] = (i >> 3) & 0x07;
data->fan_div[2] = ( (i&0x40)==0x40 ? 3 : 1 );
for( i = 1; i <= 3; i++ ) {
data->pwm[i-1] = it87_read_value(client, IT87_REG_PWM(i));
data->sg_tl[i-1][0] = it87_read_value(client, IT87_REG_SG_TL_OFF(i));
data->sg_tl[i-1][1] = it87_read_value(client, IT87_REG_SG_TL_LOW(i));
data->sg_tl[i-1][2] = it87_read_value(client, IT87_REG_SG_TL_MED(i));
data->sg_tl[i-1][3] = it87_read_value(client, IT87_REG_SG_TL_HI(i));
data->sg_tl[i-1][4] = it87_read_value(client, IT87_REG_SG_TL_OVR(i));
data->sg_pwm[i-1][0] = it87_read_value(client, IT87_REG_SG_PWM_LOW(i));
data->sg_pwm[i-1][1] = it87_read_value(client, IT87_REG_SG_PWM_MED(i));
data->sg_pwm[i-1][2] = it87_read_value(client, IT87_REG_SG_PWM_HI(i));
}
data->alarms =
it87_read_value(client, IT87_REG_ALARM1) |
(it87_read_value(client, IT87_REG_ALARM2) << 8) |
(it87_read_value(client, IT87_REG_ALARM3) << 16);
data->fan_ctl[0] = it87_read_value(client, IT87_REG_FAN_CTRL);
data->fan_ctl[1] = it87_read_value(client, IT87_REG_FAN_ONOFF);
data->last_updated = jiffies;
data->valid = 1;
}
up(&data->update_lock);
}
/* The next few functions are the call-back functions of the /proc/sys and
sysctl files. Which function is used is defined in the ctl_table in
the extra1 field.
- Each function must return the magnitude (power of 10 to divide the
data with) if it is called with operation==SENSORS_PROC_REAL_INFO.
- It must put a maximum of *nrels elements in results reflecting the
data of this file, and set *nrels to the number it actually put
in it, if operation==SENSORS_PROC_REAL_READ.
- Finally, it must get upto *nrels elements from results and write them
to the chip, if operations==SENSORS_PROC_REAL_WRITE.
Note that on SENSORS_PROC_REAL_READ, I do not check whether results is
large enough (by checking the incoming value of *nrels). This is not very
good practice, but as long as you put less than about 5 values in results,
you can assume it is large enough. */
void it87_in(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_IN0;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 2;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = IN_FROM_REG(data->in_min[nr]);
results[1] = IN_FROM_REG(data->in_max[nr]);
results[2] = IN_FROM_REG(data->in[nr]);
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->in_min[nr] = IN_TO_REG(results[0]);
it87_write_value(client, IT87_REG_VIN_MIN(nr),
data->in_min[nr]);
}
if (*nrels_mag >= 2) {
data->in_max[nr] = IN_TO_REG(results[1]);
it87_write_value(client, IT87_REG_VIN_MAX(nr),
data->in_max[nr]);
}
}
}
void it87_fan(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_FAN1 + 1;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = FAN_FROM_REG(data->fan_min[nr - 1],
DIV_FROM_REG(data->fan_div[nr - 1]));
results[1] = FAN_FROM_REG(data->fan[nr - 1],
DIV_FROM_REG(data->fan_div[nr - 1]));
*nrels_mag = 2;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->fan_min[nr - 1] = FAN_TO_REG(results[0],
DIV_FROM_REG(data->fan_div[nr - 1]));
it87_write_value(client, IT87_REG_FAN_MIN(nr),
data->fan_min[nr - 1]);
}
}
}
void it87_temp(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_TEMP1 + 1;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 1;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = TEMP_FROM_REG(data->temp_high[nr - 1]);
results[1] = TEMP_FROM_REG(data->temp_low[nr - 1]);
results[2] = TEMP_FROM_REG(data->temp[nr - 1]);
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->temp_high[nr - 1] = TEMP_TO_REG(results[0]);
it87_write_value(client, IT87_REG_TEMP_HIGH(nr),
data->temp_high[nr - 1]);
}
if (*nrels_mag >= 2) {
data->temp_low[nr - 1] = TEMP_TO_REG(results[1]);
it87_write_value(client, IT87_REG_TEMP_LOW(nr),
data->temp_low[nr - 1]);
}
}
}
void it87_pwm(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_PWM1 + 1;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = data->pwm[nr - 1];
*nrels_mag = 1;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->pwm[nr - 1] = results[0];
it87_write_value(client, IT87_REG_PWM(nr), data->pwm[nr - 1]);
}
}
}
void it87_sgpwm(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_PWM1 + 1;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = data->sg_pwm[nr - 1][0];
results[1] = data->sg_pwm[nr - 1][1];
results[2] = data->sg_pwm[nr - 1][2];
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->sg_pwm[nr - 1][0] = results[0];
it87_write_value(client, IT87_REG_SG_PWM_LOW(nr), data->sg_pwm[nr - 1][0]);
}
if (*nrels_mag >= 2) {
data->sg_pwm[nr - 1][1] = results[1];
it87_write_value(client, IT87_REG_SG_PWM_MED(nr), data->sg_pwm[nr - 1][1]);
}
if (*nrels_mag >= 3) {
data->sg_pwm[nr - 1][2] = results[2];
it87_write_value(client, IT87_REG_SG_PWM_HI(nr), data->sg_pwm[nr - 1][2]);
}
}
}
void it87_sgtl(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int nr = ctl_name - IT87_SYSCTL_PWM1 + 1;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 1;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = TEMP_FROM_REG(data->sg_tl[nr - 1][0]);
results[1] = TEMP_FROM_REG(data->sg_tl[nr - 1][1]);
results[2] = TEMP_FROM_REG(data->sg_tl[nr - 1][2]);
results[3] = TEMP_FROM_REG(data->sg_tl[nr - 1][3]);
results[4] = TEMP_FROM_REG(data->sg_tl[nr - 1][4]);
*nrels_mag = 5;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->sg_tl[nr - 1][0] = TEMP_TO_REG(results[0]);
it87_write_value(client, IT87_REG_SG_TL_OFF(nr), data->sg_pwm[nr - 1][0]);
}
if (*nrels_mag >= 2) {
data->sg_tl[nr - 1][1] = TEMP_TO_REG(results[1]);
it87_write_value(client, IT87_REG_SG_TL_LOW(nr), data->sg_pwm[nr - 1][1]);
}
if (*nrels_mag >= 3) {
data->sg_tl[nr - 1][2] = TEMP_TO_REG(results[2]);
it87_write_value(client, IT87_REG_SG_TL_MED(nr), data->sg_pwm[nr - 1][2]);
}
if (*nrels_mag >= 4) {
data->sg_tl[nr - 1][3] = TEMP_TO_REG(results[3]);
it87_write_value(client, IT87_REG_SG_TL_HI(nr), data->sg_pwm[nr - 1][3]);
}
if (*nrels_mag >= 5) {
data->sg_tl[nr - 1][4] = TEMP_TO_REG(results[4]);
it87_write_value(client, IT87_REG_SG_TL_OVR(nr), data->sg_pwm[nr - 1][4]);
}
}
}
void it87_vid(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 2;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = VID_FROM_REG(data->vid);
*nrels_mag = 1;
}
}
void it87_alarms(struct i2c_client *client, int operation,
int ctl_name, int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = ALARMS_FROM_REG(data->alarms);
*nrels_mag = 1;
}
}
void it87_fan_div(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int old;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = DIV_FROM_REG(data->fan_div[0]);
results[1] = DIV_FROM_REG(data->fan_div[1]);
results[2] = DIV_FROM_REG(data->fan_div[2]);;
*nrels_mag = 3;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
old = it87_read_value(client, IT87_REG_FAN_DIV);
if (*nrels_mag >= 3) {
data->fan_div[2] = DIV_TO_REG(results[2]);
if( data->fan[2]!=3 ) {
data->fan_div[2] = 1;
old = (old & 0xbf);
} else {
old = (old | 0x40);
}
}
if (*nrels_mag >= 2) {
data->fan_div[1] = DIV_TO_REG(results[1]);
old = (old & 0xc3) | (data->fan_div[1] << 3);
}
if (*nrels_mag >= 1) {
data->fan_div[0] = DIV_TO_REG(results[0]);
old = (old & 0xf8) | data->fan_div[0];
it87_write_value(client, IT87_REG_FAN_DIV, old);
}
}
}
void it87_fan_ctl(struct i2c_client *client, int operation, int ctl_name,
int *nrels_mag, long *results)
{
struct it87_data *data = client->data;
int index = ctl_name - IT87_SYSCTL_FAN_CTL;
if (operation == SENSORS_PROC_REAL_INFO)
*nrels_mag = 0;
else if (operation == SENSORS_PROC_REAL_READ) {
it87_update_client(client);
results[0] = data->fan_ctl[index];
*nrels_mag = 1;
} else if (operation == SENSORS_PROC_REAL_WRITE) {
if (*nrels_mag >= 1) {
data->fan_ctl[index] = results[0];
if( index == 0 )
it87_write_value(client, IT87_REG_FAN_CTRL, data->fan_ctl[index] );
else
it87_write_value(client, IT87_REG_FAN_ONOFF, data->fan_ctl[index] );
}
}
}
static int __init sm_it87_init(void)
{
printk("it87.o version %s (%s)\n", LM_VERSION, LM_DATE);
return i2c_add_driver(&it87_driver);
}
static void __exit sm_it87_exit(void)
{
i2c_del_driver(&it87_driver);
}
MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
MODULE_PARM(update_vbat, "i");
MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
MODULE_PARM(temp_type, "i");
MODULE_PARM_DESC(temp_type, "Temperature sensor type, normally leave unset");
MODULE_PARM(init, "i");
MODULE_PARM_DESC(init, "Initialize the chip's registers, default yes");
MODULE_PARM(reset_it87, "i");
MODULE_PARM_DESC(reset_it87, "Reset the chip's registers, default no");
module_init(sm_it87_init);
module_exit(sm_it87_exit);
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