2 smsc47b397.c - Part of lm_sensors, Linux kernel modules
3 for hardware monitoring
5 Supports the SMSC LPC47B397-NC Super-I/O chip.
7 Author/Maintainer: Mark M. Hoffman <mhoffman@lightlink.com>
8 Copyright (C) 2004 Utilitek Systems, Inc.
10 derived in part from smsc47m1.c:
11 Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
12 Copyright (C) 2004 Jean Delvare <khali@linux-fr.org>
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/slab.h>
31 #include <linux/ioport.h>
32 #include <linux/jiffies.h>
33 #include <linux/i2c.h>
34 #include <linux/i2c-isa.h>
35 #include <linux/hwmon.h>
36 #include <linux/err.h>
37 #include <linux/init.h>
38 #include <linux/mutex.h>
41 /* Address is autodetected, there is no default value */
42 static unsigned short address;
44 /* Super-I/0 registers and commands */
46 #define REG 0x2e /* The register to read/write */
47 #define VAL 0x2f /* The value to read/write */
49 static inline void superio_outb(int reg, int val)
55 static inline int superio_inb(int reg)
61 /* select superio logical device */
62 static inline void superio_select(int ld)
64 superio_outb(0x07, ld);
67 static inline void superio_enter(void)
72 static inline void superio_exit(void)
77 #define SUPERIO_REG_DEVID 0x20
78 #define SUPERIO_REG_DEVREV 0x21
79 #define SUPERIO_REG_BASE_MSB 0x60
80 #define SUPERIO_REG_BASE_LSB 0x61
81 #define SUPERIO_REG_LD8 0x08
83 #define SMSC_EXTENT 0x02
86 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
87 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
90 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
91 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
93 struct smsc47b397_data {
94 struct i2c_client client;
95 struct class_device *class_dev;
98 struct mutex update_lock;
99 unsigned long last_updated; /* in jiffies */
102 /* register values */
107 static int smsc47b397_read_value(struct i2c_client *client, u8 reg)
109 struct smsc47b397_data *data = i2c_get_clientdata(client);
112 mutex_lock(&data->lock);
113 outb(reg, client->addr);
114 res = inb_p(client->addr + 1);
115 mutex_unlock(&data->lock);
119 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
121 struct i2c_client *client = to_i2c_client(dev);
122 struct smsc47b397_data *data = i2c_get_clientdata(client);
125 mutex_lock(&data->update_lock);
127 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
128 dev_dbg(&client->dev, "starting device update...\n");
130 /* 4 temperature inputs, 4 fan inputs */
131 for (i = 0; i < 4; i++) {
132 data->temp[i] = smsc47b397_read_value(client,
133 SMSC47B397_REG_TEMP(i));
135 /* must read LSB first */
136 data->fan[i] = smsc47b397_read_value(client,
137 SMSC47B397_REG_FAN_LSB(i));
138 data->fan[i] |= smsc47b397_read_value(client,
139 SMSC47B397_REG_FAN_MSB(i)) << 8;
142 data->last_updated = jiffies;
145 dev_dbg(&client->dev, "... device update complete\n");
148 mutex_unlock(&data->update_lock);
153 /* TEMP: 0.001C/bit (-128C to +127C)
154 REG: 1C/bit, two's complement */
155 static int temp_from_reg(u8 reg)
157 return (s8)reg * 1000;
161 static ssize_t show_temp(struct device *dev, char *buf, int nr)
163 struct smsc47b397_data *data = smsc47b397_update_device(dev);
164 return sprintf(buf, "%d\n", temp_from_reg(data->temp[nr]));
167 #define sysfs_temp(num) \
168 static ssize_t show_temp##num(struct device *dev, struct device_attribute *attr, char *buf) \
170 return show_temp(dev, buf, num-1); \
172 static DEVICE_ATTR(temp##num##_input, S_IRUGO, show_temp##num, NULL)
180 REG: count of 90kHz pulses / revolution */
181 static int fan_from_reg(u16 reg)
183 return 90000 * 60 / reg;
187 static ssize_t show_fan(struct device *dev, char *buf, int nr)
189 struct smsc47b397_data *data = smsc47b397_update_device(dev);
190 return sprintf(buf, "%d\n", fan_from_reg(data->fan[nr]));
193 #define sysfs_fan(num) \
194 static ssize_t show_fan##num(struct device *dev, struct device_attribute *attr, char *buf) \
196 return show_fan(dev, buf, num-1); \
198 static DEVICE_ATTR(fan##num##_input, S_IRUGO, show_fan##num, NULL)
205 static struct attribute *smsc47b397_attributes[] = {
206 &dev_attr_temp1_input.attr,
207 &dev_attr_temp2_input.attr,
208 &dev_attr_temp3_input.attr,
209 &dev_attr_temp4_input.attr,
210 &dev_attr_fan1_input.attr,
211 &dev_attr_fan2_input.attr,
212 &dev_attr_fan3_input.attr,
213 &dev_attr_fan4_input.attr,
218 static const struct attribute_group smsc47b397_group = {
219 .attrs = smsc47b397_attributes,
222 static int smsc47b397_detach_client(struct i2c_client *client)
224 struct smsc47b397_data *data = i2c_get_clientdata(client);
227 hwmon_device_unregister(data->class_dev);
228 sysfs_remove_group(&client->dev.kobj, &smsc47b397_group);
230 if ((err = i2c_detach_client(client)))
233 release_region(client->addr, SMSC_EXTENT);
239 static int smsc47b397_detect(struct i2c_adapter *adapter);
241 static struct i2c_driver smsc47b397_driver = {
243 .owner = THIS_MODULE,
244 .name = "smsc47b397",
246 .attach_adapter = smsc47b397_detect,
247 .detach_client = smsc47b397_detach_client,
250 static int smsc47b397_detect(struct i2c_adapter *adapter)
252 struct i2c_client *new_client;
253 struct smsc47b397_data *data;
256 if (!request_region(address, SMSC_EXTENT,
257 smsc47b397_driver.driver.name)) {
258 dev_err(&adapter->dev, "Region 0x%x already in use!\n",
263 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
268 new_client = &data->client;
269 i2c_set_clientdata(new_client, data);
270 new_client->addr = address;
271 mutex_init(&data->lock);
272 new_client->adapter = adapter;
273 new_client->driver = &smsc47b397_driver;
274 new_client->flags = 0;
276 strlcpy(new_client->name, "smsc47b397", I2C_NAME_SIZE);
278 mutex_init(&data->update_lock);
280 if ((err = i2c_attach_client(new_client)))
283 if ((err = sysfs_create_group(&new_client->dev.kobj, &smsc47b397_group)))
286 data->class_dev = hwmon_device_register(&new_client->dev);
287 if (IS_ERR(data->class_dev)) {
288 err = PTR_ERR(data->class_dev);
295 sysfs_remove_group(&new_client->dev.kobj, &smsc47b397_group);
297 i2c_detach_client(new_client);
301 release_region(address, SMSC_EXTENT);
305 static int __init smsc47b397_find(unsigned short *addr)
310 id = superio_inb(SUPERIO_REG_DEVID);
312 if ((id != 0x6f) && (id != 0x81)) {
317 rev = superio_inb(SUPERIO_REG_DEVREV);
319 superio_select(SUPERIO_REG_LD8);
320 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
321 | superio_inb(SUPERIO_REG_BASE_LSB);
323 printk(KERN_INFO "smsc47b397: found SMSC %s "
324 "(base address 0x%04x, revision %u)\n",
325 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);
331 static int __init smsc47b397_init(void)
335 if ((ret = smsc47b397_find(&address)))
338 return i2c_isa_add_driver(&smsc47b397_driver);
341 static void __exit smsc47b397_exit(void)
343 i2c_isa_del_driver(&smsc47b397_driver);
346 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
347 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
348 MODULE_LICENSE("GPL");
350 module_init(smsc47b397_init);
351 module_exit(smsc47b397_exit);