/* 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 <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); } /* 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 mutex lock; struct mutex 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; mutex_lock(&data->lock); outb(reg, client->addr); res = inb_p(client->addr + 1); mutex_unlock(&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; mutex_lock(&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"); } mutex_unlock(&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; mutex_init(&data->lock); new_client->adapter = adapter; new_client->driver = &smsc47b397_driver; new_client->flags = 0; strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE); mutex_init(&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);