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340 lines
8.1 KiB
340 lines
8.1 KiB
/*
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smsc47b397.c - Part of lm_sensors, Linux kernel modules
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for hardware monitoring
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Supports the SMSC LPC47B397-NC Super-I/O chip.
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Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
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Copyright (C) 2004 Utilitek Systems, Inc.
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derived in part from smsc47m1.c:
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Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
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Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/i2c-isa.h>
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#include <linux/hwmon.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <asm/io.h>
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/* Address is autodetected, there is no default value */
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static unsigned short address;
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/* Super-I/0 registers and commands */
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#define REG 0x2e /* The register to read/write */
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#define VAL 0x2f /* The value to read/write */
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static inline void superio_outb(int reg, int val)
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{
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outb(reg, REG);
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outb(val, VAL);
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}
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static inline int superio_inb(int reg)
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{
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outb(reg, REG);
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return inb(VAL);
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}
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/* select superio logical device */
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static inline void superio_select(int ld)
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{
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superio_outb(0x07, ld);
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}
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static inline void superio_enter(void)
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{
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outb(0x55, REG);
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}
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static inline void superio_exit(void)
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{
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outb(0xAA, REG);
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}
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#define SUPERIO_REG_DEVID 0x20
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#define SUPERIO_REG_DEVREV 0x21
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#define SUPERIO_REG_BASE_MSB 0x60
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#define SUPERIO_REG_BASE_LSB 0x61
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#define SUPERIO_REG_LD8 0x08
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#define SMSC_EXTENT 0x02
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/* 0 <= nr <= 3 */
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static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
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#define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
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/* 0 <= nr <= 3 */
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#define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
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#define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
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struct smsc47b397_data {
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struct i2c_client client;
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struct class_device *class_dev;
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struct semaphore lock;
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struct semaphore update_lock;
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unsigned long last_updated; /* in jiffies */
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int valid;
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/* register values */
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u16 fan[4];
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u8 temp[4];
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};
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static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
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{
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struct smsc47b397_data *data = i2c_get_clientdata(client);
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int res;
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down(&data->lock);
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outb(reg, client->addr);
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res = inb_p(client->addr + 1);
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up(&data->lock);
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return res;
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}
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static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct smsc47b397_data *data = i2c_get_clientdata(client);
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int i;
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down(&data->update_lock);
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if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
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dev_dbg(&client->dev, "starting device update...\n");
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/* 4 temperature inputs, 4 fan inputs */
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for (i = 0; i < 4; i++) {
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data->temp[i] = smsc47b397_read_value(client,
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SMSC47B397_REG_TEMP(i));
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/* must read LSB first */
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data->fan[i] = smsc47b397_read_value(client,
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SMSC47B397_REG_FAN_LSB(i));
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data->fan[i] |= smsc47b397_read_value(client,
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SMSC47B397_REG_FAN_MSB(i)) << 8;
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}
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data->last_updated = jiffies;
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data->valid = 1;
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dev_dbg(&client->dev, "... device update complete\n");
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}
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up(&data->update_lock);
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return data;
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}
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/* TEMP: 0.001C/bit (-128C to +127C)
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REG: 1C/bit, two's complement */
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static int temp_from_reg(u8 reg)
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{
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return (s8)reg * 1000;
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}
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/* 0 <= nr <= 3 */
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static ssize_t show_temp(struct device *dev, char *buf, int nr)
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{
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struct smsc47b397_data *data = smsc47b397_update_device(dev);
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return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
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}
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#define sysfs_temp(num) \
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static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return show_temp(dev, buf, num-1); \
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} \
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static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
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sysfs_temp(1);
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sysfs_temp(2);
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sysfs_temp(3);
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sysfs_temp(4);
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#define device_create_file_temp(client, num) \
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device_create_file(&client->dev, &dev_attr_temp##num##_input)
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/* FAN: 1 RPM/bit
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REG: count of 90kHz pulses / revolution */
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static int fan_from_reg(u16 reg)
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{
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return 90000 * 60 / reg;
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}
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/* 0 <= nr <= 3 */
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static ssize_t show_fan(struct device *dev, char *buf, int nr)
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{
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struct smsc47b397_data *data = smsc47b397_update_device(dev);
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return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
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}
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#define sysfs_fan(num) \
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static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
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{ \
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return show_fan(dev, buf, num-1); \
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} \
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static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
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sysfs_fan(1);
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sysfs_fan(2);
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sysfs_fan(3);
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sysfs_fan(4);
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#define device_create_file_fan(client, num) \
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device_create_file(&client->dev, &dev_attr_fan##num##_input)
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static int smsc47b397_detach_client(struct i2c_client *client)
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{
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struct smsc47b397_data *data = i2c_get_clientdata(client);
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int err;
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hwmon_device_unregister(data->class_dev);
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if ((err = i2c_detach_client(client)))
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return err;
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release_region(client->addr, SMSC_EXTENT);
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kfree(data);
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return 0;
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}
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static int smsc47b397_detect(struct i2c_adapter *adapter);
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static struct i2c_driver smsc47b397_driver = {
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.owner = THIS_MODULE,
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.name = "smsc47b397",
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.attach_adapter = smsc47b397_detect,
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.detach_client = smsc47b397_detach_client,
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};
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static int smsc47b397_detect(struct i2c_adapter *adapter)
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{
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struct i2c_client *new_client;
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struct smsc47b397_data *data;
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int err = 0;
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if (!request_region(address, SMSC_EXTENT, smsc47b397_driver.name)) {
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dev_err(&adapter->dev, "Region 0x%x already in use!\n",
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address);
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return -EBUSY;
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}
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if (!(data = kmalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto error_release;
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}
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memset(data, 0x00, sizeof(struct smsc47b397_data));
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new_client = &data->client;
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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init_MUTEX(&data->lock);
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new_client->adapter = adapter;
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new_client->driver = &smsc47b397_driver;
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new_client->flags = 0;
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strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
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init_MUTEX(&data->update_lock);
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if ((err = i2c_attach_client(new_client)))
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goto error_free;
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data->class_dev = hwmon_device_register(&new_client->dev);
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if (IS_ERR(data->class_dev)) {
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err = PTR_ERR(data->class_dev);
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goto error_detach;
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}
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device_create_file_temp(new_client, 1);
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device_create_file_temp(new_client, 2);
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device_create_file_temp(new_client, 3);
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device_create_file_temp(new_client, 4);
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device_create_file_fan(new_client, 1);
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device_create_file_fan(new_client, 2);
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device_create_file_fan(new_client, 3);
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device_create_file_fan(new_client, 4);
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return 0;
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error_detach:
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i2c_detach_client(new_client);
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error_free:
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kfree(data);
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error_release:
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release_region(address, SMSC_EXTENT);
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return err;
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}
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static int __init smsc47b397_find(unsigned short *addr)
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{
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u8 id, rev;
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superio_enter();
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id = superio_inb(SUPERIO_REG_DEVID);
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if (id != 0x6f) {
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superio_exit();
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return -ENODEV;
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}
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rev = superio_inb(SUPERIO_REG_DEVREV);
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superio_select(SUPERIO_REG_LD8);
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*addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
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| superio_inb(SUPERIO_REG_BASE_LSB);
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printk(KERN_INFO "smsc47b397: found SMSC LPC47B397-NC "
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"(base address 0x%04x, revision %u)\n", *addr, rev);
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superio_exit();
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return 0;
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}
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static int __init smsc47b397_init(void)
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{
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int ret;
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if ((ret = smsc47b397_find(&address)))
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return ret;
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return i2c_isa_add_driver(&smsc47b397_driver);
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}
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static void __exit smsc47b397_exit(void)
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{
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i2c_isa_del_driver(&smsc47b397_driver);
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}
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MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
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MODULE_DESCRIPTION("SMSC LPC47B397 driver");
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MODULE_LICENSE("GPL");
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module_init(smsc47b397_init);
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module_exit(smsc47b397_exit);
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