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/platform_device.h>
34 #include <linux/hwmon.h>
35 #include <linux/hwmon-sysfs.h>
36 #include <linux/err.h>
37 #include <linux/init.h>
38 #include <linux/mutex.h>
41 static struct platform_device *pdev;
43 #define DRVNAME "smsc47b397"
45 /* Super-I/0 registers and commands */
47 #define REG 0x2e /* The register to read/write */
48 #define VAL 0x2f /* The value to read/write */
50 static inline void superio_outb(int reg, int val)
56 static inline int superio_inb(int reg)
62 /* select superio logical device */
63 static inline void superio_select(int ld)
65 superio_outb(0x07, ld);
68 static inline void superio_enter(void)
73 static inline void superio_exit(void)
78 #define SUPERIO_REG_DEVID 0x20
79 #define SUPERIO_REG_DEVREV 0x21
80 #define SUPERIO_REG_BASE_MSB 0x60
81 #define SUPERIO_REG_BASE_LSB 0x61
82 #define SUPERIO_REG_LD8 0x08
84 #define SMSC_EXTENT 0x02
87 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
88 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
91 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
92 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
94 struct smsc47b397_data {
97 struct class_device *class_dev;
100 struct mutex update_lock;
101 unsigned long last_updated; /* in jiffies */
104 /* register values */
109 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
113 mutex_lock(&data->lock);
114 outb(reg, data->addr);
115 res = inb_p(data->addr + 1);
116 mutex_unlock(&data->lock);
120 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
122 struct smsc47b397_data *data = dev_get_drvdata(dev);
125 mutex_lock(&data->update_lock);
127 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
128 dev_dbg(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(data,
133 SMSC47B397_REG_TEMP(i));
135 /* must read LSB first */
136 data->fan[i] = smsc47b397_read_value(data,
137 SMSC47B397_REG_FAN_LSB(i));
138 data->fan[i] |= smsc47b397_read_value(data,
139 SMSC47B397_REG_FAN_MSB(i)) << 8;
142 data->last_updated = jiffies;
145 dev_dbg(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;
160 static ssize_t show_temp(struct device *dev, struct device_attribute
163 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
164 struct smsc47b397_data *data = smsc47b397_update_device(dev);
165 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
168 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
169 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
170 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
171 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
174 REG: count of 90kHz pulses / revolution */
175 static int fan_from_reg(u16 reg)
177 return 90000 * 60 / reg;
180 static ssize_t show_fan(struct device *dev, struct device_attribute
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
184 struct smsc47b397_data *data = smsc47b397_update_device(dev);
185 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
187 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
188 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
189 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
190 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
192 static ssize_t show_name(struct device *dev, struct device_attribute
195 struct smsc47b397_data *data = dev_get_drvdata(dev);
196 return sprintf(buf, "%s\n", data->name);
198 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
200 static struct attribute *smsc47b397_attributes[] = {
201 &sensor_dev_attr_temp1_input.dev_attr.attr,
202 &sensor_dev_attr_temp2_input.dev_attr.attr,
203 &sensor_dev_attr_temp3_input.dev_attr.attr,
204 &sensor_dev_attr_temp4_input.dev_attr.attr,
205 &sensor_dev_attr_fan1_input.dev_attr.attr,
206 &sensor_dev_attr_fan2_input.dev_attr.attr,
207 &sensor_dev_attr_fan3_input.dev_attr.attr,
208 &sensor_dev_attr_fan4_input.dev_attr.attr,
214 static const struct attribute_group smsc47b397_group = {
215 .attrs = smsc47b397_attributes,
218 static int __devexit smsc47b397_remove(struct platform_device *pdev)
220 struct smsc47b397_data *data = platform_get_drvdata(pdev);
221 struct resource *res;
223 hwmon_device_unregister(data->class_dev);
224 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
225 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
226 release_region(res->start, SMSC_EXTENT);
232 static int smsc47b397_probe(struct platform_device *pdev);
234 static struct platform_driver smsc47b397_driver = {
236 .owner = THIS_MODULE,
239 .probe = smsc47b397_probe,
240 .remove = __devexit_p(smsc47b397_remove),
243 static int __devinit smsc47b397_probe(struct platform_device *pdev)
245 struct device *dev = &pdev->dev;
246 struct smsc47b397_data *data;
247 struct resource *res;
250 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
251 if (!request_region(res->start, SMSC_EXTENT,
252 smsc47b397_driver.driver.name)) {
253 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
254 (unsigned long)res->start,
255 (unsigned long)res->start + SMSC_EXTENT - 1);
259 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
264 data->addr = res->start;
265 data->name = "smsc47b397";
266 mutex_init(&data->lock);
267 mutex_init(&data->update_lock);
268 platform_set_drvdata(pdev, data);
270 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
273 data->class_dev = hwmon_device_register(dev);
274 if (IS_ERR(data->class_dev)) {
275 err = PTR_ERR(data->class_dev);
282 sysfs_remove_group(&dev->kobj, &smsc47b397_group);
286 release_region(res->start, SMSC_EXTENT);
290 static int __init smsc47b397_device_add(unsigned short address)
292 struct resource res = {
294 .end = address + SMSC_EXTENT - 1,
296 .flags = IORESOURCE_IO,
300 pdev = platform_device_alloc(DRVNAME, address);
303 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
307 err = platform_device_add_resources(pdev, &res, 1);
309 printk(KERN_ERR DRVNAME ": Device resource addition failed "
311 goto exit_device_put;
314 err = platform_device_add(pdev);
316 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
318 goto exit_device_put;
324 platform_device_put(pdev);
329 static int __init smsc47b397_find(unsigned short *addr)
334 id = superio_inb(SUPERIO_REG_DEVID);
336 if ((id != 0x6f) && (id != 0x81)) {
341 rev = superio_inb(SUPERIO_REG_DEVREV);
343 superio_select(SUPERIO_REG_LD8);
344 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
345 | superio_inb(SUPERIO_REG_BASE_LSB);
347 printk(KERN_INFO DRVNAME ": found SMSC %s "
348 "(base address 0x%04x, revision %u)\n",
349 id == 0x81 ? "SCH5307-NS" : "LPC47B397-NC", *addr, rev);
355 static int __init smsc47b397_init(void)
357 unsigned short address;
360 if ((ret = smsc47b397_find(&address)))
363 ret = platform_driver_register(&smsc47b397_driver);
367 /* Sets global pdev as a side effect */
368 ret = smsc47b397_device_add(address);
375 platform_driver_unregister(&smsc47b397_driver);
380 static void __exit smsc47b397_exit(void)
382 platform_device_unregister(pdev);
383 platform_driver_unregister(&smsc47b397_driver);
386 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
387 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
388 MODULE_LICENSE("GPL");
390 module_init(smsc47b397_init);
391 module_exit(smsc47b397_exit);