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|
/*
smsc47m1.c - Part of lm_sensors, Linux kernel modules
for hardware monitoring
Supports the SMSC LPC47B27x, LPC47M10x, LPC47M13x, LPC47M14x,
LPC47M15x, LPC47M192 and LPC47M997 Super-I/O chips.
Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
and Jean Delvare
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/slab.h>
#include <linux/ioport.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/i2c-isa.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <asm/io.h>
/* Address is autodetected, there is no default value */
static unsigned short address;
/* Super-I/0 registers and commands */
#define REG 0x2e /* The register to read/write */
#define VAL 0x2f /* The value to read/write */
static inline void
superio_outb(int reg, int val)
{
outb(reg, REG);
outb(val, VAL);
}
static inline int
superio_inb(int reg)
{
outb(reg, REG);
return inb(VAL);
}
/* logical device for fans is 0x0A */
#define superio_select() superio_outb(0x07, 0x0A)
static inline void
superio_enter(void)
{
outb(0x55, REG);
}
static inline void
superio_exit(void)
{
outb(0xAA, REG);
}
#define SUPERIO_REG_ACT 0x30
#define SUPERIO_REG_BASE 0x60
#define SUPERIO_REG_DEVID 0x20
/* Logical device registers */
#define SMSC_EXTENT 0x80
/* nr is 0 or 1 in the macros below */
#define SMSC47M1_REG_ALARM 0x04
#define SMSC47M1_REG_TPIN(nr) (0x34 - (nr))
#define SMSC47M1_REG_PPIN(nr) (0x36 - (nr))
#define SMSC47M1_REG_PWM(nr) (0x56 + (nr))
#define SMSC47M1_REG_FANDIV 0x58
#define SMSC47M1_REG_FAN(nr) (0x59 + (nr))
#define SMSC47M1_REG_FAN_PRELOAD(nr) (0x5B + (nr))
#define MIN_FROM_REG(reg,div) ((reg)>=192 ? 0 : \
983040/((192-(reg))*(div)))
#define FAN_FROM_REG(reg,div,preload) ((reg)<=(preload) || (reg)==255 ? 0 : \
983040/(((reg)-(preload))*(div)))
#define DIV_FROM_REG(reg) (1 << (reg))
#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)
#define PWM_EN_FROM_REG(reg) ((~(reg)) & 0x01)
#define PWM_TO_REG(reg) (((reg) >> 1) & 0x7E)
struct smsc47m1_data {
struct i2c_client client;
struct class_device *class_dev;
struct mutex lock;
struct mutex update_lock;
unsigned long last_updated; /* In jiffies */
u8 fan[2]; /* Register value */
u8 fan_preload[2]; /* Register value */
u8 fan_div[2]; /* Register encoding, shifted right */
u8 alarms; /* Register encoding */
u8 pwm[2]; /* Register value (bit 7 is enable) */
};
static int smsc47m1_detect(struct i2c_adapter *adapter);
static int smsc47m1_detach_client(struct i2c_client *client);
static int smsc47m1_read_value(struct i2c_client *client, u8 reg);
static void smsc47m1_write_value(struct i2c_client *client, u8 reg, u8 value);
static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
int init);
static struct i2c_driver smsc47m1_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "smsc47m1",
},
.attach_adapter = smsc47m1_detect,
.detach_client = smsc47m1_detach_client,
};
/* nr is 0 or 1 in the callback functions below */
static ssize_t get_fan(struct device *dev, char *buf, int nr)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
/* This chip (stupidly) stops monitoring fan speed if PWM is
enabled and duty cycle is 0%. This is fine if the monitoring
and control concern the same fan, but troublesome if they are
not (which could as well happen). */
int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
FAN_FROM_REG(data->fan[nr],
DIV_FROM_REG(data->fan_div[nr]),
data->fan_preload[nr]);
return sprintf(buf, "%d\n", rpm);
}
static ssize_t get_fan_min(struct device *dev, char *buf, int nr)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
int rpm = MIN_FROM_REG(data->fan_preload[nr],
DIV_FROM_REG(data->fan_div[nr]));
return sprintf(buf, "%d\n", rpm);
}
static ssize_t get_fan_div(struct device *dev, char *buf, int nr)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
}
static ssize_t get_pwm(struct device *dev, char *buf, int nr)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[nr]));
}
static ssize_t get_pwm_en(struct device *dev, char *buf, int nr)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[nr]));
}
static ssize_t get_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
return sprintf(buf, "%d\n", data->alarms);
}
static ssize_t set_fan_min(struct device *dev, const char *buf,
size_t count, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct smsc47m1_data *data = i2c_get_clientdata(client);
long rpmdiv, val = simple_strtol(buf, NULL, 10);
mutex_lock(&data->update_lock);
rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);
if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
mutex_unlock(&data->update_lock);
return -EINVAL;
}
data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
smsc47m1_write_value(client, SMSC47M1_REG_FAN_PRELOAD(nr),
data->fan_preload[nr]);
mutex_unlock(&data->update_lock);
return count;
}
/* Note: we save and restore the fan minimum here, because its value is
determined in part by the fan clock divider. This follows the principle
of least surprise; the user doesn't expect the fan minimum to change just
because the divider changed. */
static ssize_t set_fan_div(struct device *dev, const char *buf,
size_t count, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct smsc47m1_data *data = i2c_get_clientdata(client);
long new_div = simple_strtol(buf, NULL, 10), tmp;
u8 old_div = DIV_FROM_REG(data->fan_div[nr]);
if (new_div == old_div) /* No change */
return count;
mutex_lock(&data->update_lock);
switch (new_div) {
case 1: data->fan_div[nr] = 0; break;
case 2: data->fan_div[nr] = 1; break;
case 4: data->fan_div[nr] = 2; break;
case 8: data->fan_div[nr
|