/*
smsc47b397.c - Part of lm_sensors, Linux kernel modules
for hardware monitoring
Supports the SMSC LPC47B397-NC Super-I/O chip.
Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
Copyright (C) 2004 Utilitek Systems, Inc.
derived in part from smsc47m1.c:
Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
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 <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);
}
/* select superio logical device */
static inline void superio_select(int ld)
{
superio_outb(0x07, ld);
}
static inline void superio_enter(void)
{
outb(0x55, REG);
}
static inline void superio_exit(void)
{
outb(0xAA, REG);
}
#define SUPERIO_REG_DEVID 0x20
#define SUPERIO_REG_DEVREV 0x21
#define SUPERIO_REG_BASE_MSB 0x60
#define SUPERIO_REG_BASE_LSB 0x61
#define SUPERIO_REG_LD8 0x08
#define SMSC_EXTENT 0x02
/* 0 <= nr <= 3 */
static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
/* 0 <= nr <= 3 */
#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
struct smsc47b397_data {
struct i2c_client client;
struct class_device *class_dev;
struct semaphore lock;
struct semaphore update_lock;
unsigned long last_updated; /* in jiffies */
int valid;
/* register values */
u16 fan[4];
u8 temp[4];
};
static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
{
struct smsc47b397_data *data = i2c_get_clientdata(client);
int res;
down(&data->lock);
outb(reg, client->addr);
res = inb_p(client->addr + 1);
up(&data->lock);
return res;
}
static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct smsc47b397_data *data = i2c_get_clientdata(client);
int i;
down(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
dev_dbg(&client->dev, "starting device update...\n");
/* 4 temperature inputs, 4 fan inputs */
for (i = 0; i < 4; i++) {
data->temp[i] = smsc47b397_read_value(client,
SMSC47B397_REG_TEMP(i));
/* must read LSB first */
data->fan[i] = smsc47b397_read_value(client,
SMSC47B397_REG_FAN_LSB(i));
data->fan[i] |= smsc47b397_read_value(client,
SMSC47B397_REG_FAN_MSB(i)) << 8;
}
data->last_updated = jiffies;
data->valid = 1;
dev_dbg(&client->dev, "... device update complete\n");
}
up(&data->update_lock);
return data;
}
/* TEMP: 0.001C/bit (-128C to +127C)
REG: 1C/bit, two's complement */
static int temp_from_reg(u8 reg)
{
return (s8)reg * 1000;
}
/* 0 <= nr <= 3 */
static ssize_t show_temp(struct device *dev, char *buf, int nr)
{
struct smsc47b397_data *data = smsc47b397_update_device(dev);
return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
}
#define sysfs_temp(num) \
static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
return show_temp(dev, buf, num-1); \
} \
static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
sysfs_temp(1);
sysfs_temp(2);
sysfs_temp(3);
sysfs_temp(4);
#define device_create_file_temp(client, num) \
device_create_file(&client->dev, &dev_attr_temp##num##_input)
/* FAN: 1 RPM/bit
REG: count of 90kHz pulses / revolution */
static int fan_from_reg(u16 reg)
{
return 90000 * 60 / reg;
}
/* 0 <= nr <= 3 */
static ssize_t show_fan(struct device *dev, char *buf, int nr)
{
struct smsc47b397_data *data = smsc47b397_update_device(dev);
return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
}
#define sysfs_fan(num) \
static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
return show_fan(dev, buf, num-1); \
} \
static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
sysfs_fan(1);
sysfs_fan(2);
sysfs_fan(3);
sysfs_fan(4);
#define device_create_file_fan(client, num) \
device_create_file(&client->dev, &dev_attr_fan##num##_input)
static int smsc47b397_detach_client(struct i2c_client *client)
{
struct smsc47b397_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->class_dev);
if ((err = i2c_detach_client(client)))
return err;
release_region(client->addr, SMSC_EXTENT);
kfree(data);
return 0;
}
static int smsc47b397_detect(struct i2c_adapter *adapter);
static struct i2c_driver smsc47b397_driver = {
.driver = {
.name = "smsc47b397",
},
.attach_adapter = smsc47b397_detect,
.detach_client = smsc47b397_detach_client,
};
static int smsc47b397_detect(struct i2c_adapter *adapter)
{
struct i2c_client *new_client;
struct smsc47b397_data *data;
int err = 0;
if (!request_region(address, SMSC_EXTENT,
smsc47b397_driver.driver.name)) {
dev_err(&adapter->dev, "Region 0x%x already in use!\n",
address);
return -EBUSY;
}
if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
err = -ENOMEM;
goto error_release;
}
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
init_MUTEX(&data->lock);
new_client->adapter = adapter;
new_client->driver = &smsc47b397_driver;
new_client->flags = 0;
strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
init_MUTEX(&data->update_lock);
if ((err = i2c_attach_client(new_client)))
goto error_free;
data->class_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->class_dev)) {
err = PTR_ERR(data->class_dev);
goto error_detach;
}
device_create_file_temp(new_client, 1);
device_create_file_temp(new_client, 2);
device_create_file_temp(new_client, 3);
device_create_file_temp(new_client, 4);
device_create_file_fan(new_client, 1);
device_create_file_fan(new_client, 2);
device_create_file_fan(new_client, 3);
device_create_file_fan(new_client, 4);
return 0;
error_detach:
i2c_detach_client(new_client);
error_free:
kfree(data);
error_release:
release_region(address, SMSC_EXTENT);
return err;
}
static int __init smsc47b397_find(unsigned short *addr)
{
u8 id, rev;
superio_enter();
id = superio_inb(SUPERIO_REG_DEVID);
if ((id != 0x6f) && (id != 0x81)) {
superio_exit();
return -ENODEV;
}
rev = superio_inb(SUPERIO_REG_DEVREV);
superio_select(SUPERIO_REG_LD8);
*addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
| superio_inb(SUPERIO_REG_BASE_LSB);
printk(KERN_INFO "smsc47b397: found SMSC %s "
"(base address 0x%04x, revision %u)\n",
id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);
superio_exit();
return 0;
}
static int __init smsc47b397_init(void)
{
int ret;
if ((ret = smsc47b397_find(&address)))
return ret;
return i2c_isa_add_driver(&smsc47b397_driver);
}
static void __exit smsc47b397_exit(void)
{
i2c_isa_del_driver(&smsc47b397_driver);
}
MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
MODULE_DESCRIPTION("SMSC LPC47B397 driver");
MODULE_LICENSE("GPL");
module_init(smsc47b397_init);
module_exit(smsc47b397_exit);
