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 unsigned short force_id;
42 module_param(force_id, ushort, 0);
43 MODULE_PARM_DESC(force_id, "Override the detected device ID");
45 static struct platform_device *pdev;
47 #define DRVNAME "smsc47b397"
49 /* Super-I/0 registers and commands */
51 #define REG 0x2e /* The register to read/write */
52 #define VAL 0x2f /* The value to read/write */
54 static inline void superio_outb(int reg, int val)
60 static inline int superio_inb(int reg)
66 /* select superio logical device */
67 static inline void superio_select(int ld)
69 superio_outb(0x07, ld);
72 static inline void superio_enter(void)
77 static inline void superio_exit(void)
82 #define SUPERIO_REG_DEVID 0x20
83 #define SUPERIO_REG_DEVREV 0x21
84 #define SUPERIO_REG_BASE_MSB 0x60
85 #define SUPERIO_REG_BASE_LSB 0x61
86 #define SUPERIO_REG_LD8 0x08
88 #define SMSC_EXTENT 0x02
91 static u8 smsc47b397_reg_temp[] = {0x25, 0x26, 0x27, 0x80};
92 #define SMSC47B397_REG_TEMP(nr) (smsc47b397_reg_temp[(nr)])
95 #define SMSC47B397_REG_FAN_LSB(nr) (0x28 + 2 * (nr))
96 #define SMSC47B397_REG_FAN_MSB(nr) (0x29 + 2 * (nr))
98 struct smsc47b397_data {
101 struct device *hwmon_dev;
104 struct mutex update_lock;
105 unsigned long last_updated; /* in jiffies */
108 /* register values */
113 static int smsc47b397_read_value(struct smsc47b397_data* data, u8 reg)
117 mutex_lock(&data->lock);
118 outb(reg, data->addr);
119 res = inb_p(data->addr + 1);
120 mutex_unlock(&data->lock);
124 static struct smsc47b397_data *smsc47b397_update_device(struct device *dev)
126 struct smsc47b397_data *data = dev_get_drvdata(dev);
129 mutex_lock(&data->update_lock);
131 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
132 dev_dbg(dev, "starting device update...\n");
134 /* 4 temperature inputs, 4 fan inputs */
135 for (i = 0; i < 4; i++) {
136 data->temp[i] = smsc47b397_read_value(data,
137 SMSC47B397_REG_TEMP(i));
139 /* must read LSB first */
140 data->fan[i] = smsc47b397_read_value(data,
141 SMSC47B397_REG_FAN_LSB(i));
142 data->fan[i] |= smsc47b397_read_value(data,
143 SMSC47B397_REG_FAN_MSB(i)) << 8;
146 data->last_updated = jiffies;
149 dev_dbg(dev, "... device update complete\n");
152 mutex_unlock(&data->update_lock);
157 /* TEMP: 0.001C/bit (-128C to +127C)
158 REG: 1C/bit, two's complement */
159 static int temp_from_reg(u8 reg)
161 return (s8)reg * 1000;
164 static ssize_t show_temp(struct device *dev, struct device_attribute
167 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
168 struct smsc47b397_data *data = smsc47b397_update_device(dev);
169 return sprintf(buf, "%d\n", temp_from_reg(data->temp[attr->index]));
172 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
173 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
174 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
175 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
178 REG: count of 90kHz pulses / revolution */
179 static int fan_from_reg(u16 reg)
181 if (reg == 0 || reg == 0xffff)
183 return 90000 * 60 / reg;
186 static ssize_t show_fan(struct device *dev, struct device_attribute
189 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
190 struct smsc47b397_data *data = smsc47b397_update_device(dev);
191 return sprintf(buf, "%d\n", fan_from_reg(data->fan[attr->index]));
193 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
194 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
195 static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
196 static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, show_fan, NULL, 3);
198 static ssize_t show_name(struct device *dev, struct device_attribute
201 struct smsc47b397_data *data = dev_get_drvdata(dev);
202 return sprintf(buf, "%s\n", data->name);
204 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
206 static struct attribute *smsc47b397_attributes[] = {
207 &sensor_dev_attr_temp1_input.dev_attr.attr,
208 &sensor_dev_attr_temp2_input.dev_attr.attr,
209 &sensor_dev_attr_temp3_input.dev_attr.attr,
210 &sensor_dev_attr_temp4_input.dev_attr.attr,
211 &sensor_dev_attr_fan1_input.dev_attr.attr,
212 &sensor_dev_attr_fan2_input.dev_attr.attr,
213 &sensor_dev_attr_fan3_input.dev_attr.attr,
214 &sensor_dev_attr_fan4_input.dev_attr.attr,
220 static const struct attribute_group smsc47b397_group = {
221 .attrs = smsc47b397_attributes,
224 static int __devexit smsc47b397_remove(struct platform_device *pdev)
226 struct smsc47b397_data *data = platform_get_drvdata(pdev);
227 struct resource *res;
229 hwmon_device_unregister(data->hwmon_dev);
230 sysfs_remove_group(&pdev->dev.kobj, &smsc47b397_group);
231 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
232 release_region(res->start, SMSC_EXTENT);
238 static int smsc47b397_probe(struct platform_device *pdev);
240 static struct platform_driver smsc47b397_driver = {
242 .owner = THIS_MODULE,
245 .probe = smsc47b397_probe,
246 .remove = __devexit_p(smsc47b397_remove),
249 static int __devinit smsc47b397_probe(struct platform_device *pdev)
251 struct device *dev = &pdev->dev;
252 struct smsc47b397_data *data;
253 struct resource *res;
256 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
257 if (!request_region(res->start, SMSC_EXTENT,
258 smsc47b397_driver.driver.name)) {
259 dev_err(dev, "Region 0x%lx-0x%lx already in use!\n",
260 (unsigned long)res->start,
261 (unsigned long)res->start + SMSC_EXTENT - 1);
265 if (!(data = kzalloc(sizeof(struct smsc47b397_data), GFP_KERNEL))) {
270 data->addr = res->start;
271 data->name = "smsc47b397";
272 mutex_init(&data->lock);
273 mutex_init(&data->update_lock);
274 platform_set_drvdata(pdev, data);
276 if ((err = sysfs_create_group(&dev->kobj, &smsc47b397_group)))
279 data->hwmon_dev = hwmon_device_register(dev);
280 if (IS_ERR(data->hwmon_dev)) {
281 err = PTR_ERR(data->hwmon_dev);
288 sysfs_remove_group(&dev->kobj, &smsc47b397_group);
292 release_region(res->start, SMSC_EXTENT);
296 static int __init smsc47b397_device_add(unsigned short address)
298 struct resource res = {
300 .end = address + SMSC_EXTENT - 1,
302 .flags = IORESOURCE_IO,
306 pdev = platform_device_alloc(DRVNAME, address);
309 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
313 err = platform_device_add_resources(pdev, &res, 1);
315 printk(KERN_ERR DRVNAME ": Device resource addition failed "
317 goto exit_device_put;
320 err = platform_device_add(pdev);
322 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
324 goto exit_device_put;
330 platform_device_put(pdev);
335 static int __init smsc47b397_find(unsigned short *addr)
341 id = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);
348 name = "LPC47B397-NC";
359 rev = superio_inb(SUPERIO_REG_DEVREV);
361 superio_select(SUPERIO_REG_LD8);
362 *addr = (superio_inb(SUPERIO_REG_BASE_MSB) << 8)
363 | superio_inb(SUPERIO_REG_BASE_LSB);
365 printk(KERN_INFO DRVNAME ": found SMSC %s "
366 "(base address 0x%04x, revision %u)\n",
373 static int __init smsc47b397_init(void)
375 unsigned short address;
378 if ((ret = smsc47b397_find(&address)))
381 ret = platform_driver_register(&smsc47b397_driver);
385 /* Sets global pdev as a side effect */
386 ret = smsc47b397_device_add(address);
393 platform_driver_unregister(&smsc47b397_driver);
398 static void __exit smsc47b397_exit(void)
400 platform_device_unregister(pdev);
401 platform_driver_unregister(&smsc47b397_driver);
404 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
405 MODULE_DESCRIPTION("SMSC LPC47B397 driver");
406 MODULE_LICENSE("GPL");
408 module_init(smsc47b397_init);
409 module_exit(smsc47b397_exit);