kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / hwmon / lm80.c
blobc359fdea211eddaba1e520fe919427f8a3d3bf3a
1 /*
2 * lm80.c - From lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
5 * and Philip Edelbrock <phil@netroedge.com>
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/jiffies.h>
28 #include <linux/i2c.h>
29 #include <linux/hwmon.h>
30 #include <linux/err.h>
32 /* Addresses to scan */
33 static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c,
34 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
36 /* Insmod parameters */
37 I2C_CLIENT_INSMOD_1(lm80);
39 /* Many LM80 constants specified below */
41 /* The LM80 registers */
42 #define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
43 #define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
44 #define LM80_REG_IN(nr) (0x20 + (nr))
46 #define LM80_REG_FAN1 0x28
47 #define LM80_REG_FAN2 0x29
48 #define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
50 #define LM80_REG_TEMP 0x27
51 #define LM80_REG_TEMP_HOT_MAX 0x38
52 #define LM80_REG_TEMP_HOT_HYST 0x39
53 #define LM80_REG_TEMP_OS_MAX 0x3a
54 #define LM80_REG_TEMP_OS_HYST 0x3b
56 #define LM80_REG_CONFIG 0x00
57 #define LM80_REG_ALARM1 0x01
58 #define LM80_REG_ALARM2 0x02
59 #define LM80_REG_MASK1 0x03
60 #define LM80_REG_MASK2 0x04
61 #define LM80_REG_FANDIV 0x05
62 #define LM80_REG_RES 0x06
65 /* Conversions. Rounding and limit checking is only done on the TO_REG
66 variants. Note that you should be a bit careful with which arguments
67 these macros are called: arguments may be evaluated more than once.
68 Fixing this is just not worth it. */
70 #define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255))
71 #define IN_FROM_REG(val) ((val)*10)
73 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
75 if (rpm == 0)
76 return 255;
77 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
78 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
81 #define FAN_FROM_REG(val,div) ((val)==0?-1:\
82 (val)==255?0:1350000/((div)*(val)))
84 static inline long TEMP_FROM_REG(u16 temp)
86 long res;
88 temp >>= 4;
89 if (temp < 0x0800)
90 res = 625 * (long) temp;
91 else
92 res = ((long) temp - 0x01000) * 625;
94 return res / 10;
97 #define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
99 #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\
100 ((val)-500)/1000:((val)+500)/1000,0,255)
102 #define DIV_FROM_REG(val) (1 << (val))
105 * Client data (each client gets its own)
108 struct lm80_data {
109 struct i2c_client client;
110 struct class_device *class_dev;
111 struct semaphore update_lock;
112 char valid; /* !=0 if following fields are valid */
113 unsigned long last_updated; /* In jiffies */
115 u8 in[7]; /* Register value */
116 u8 in_max[7]; /* Register value */
117 u8 in_min[7]; /* Register value */
118 u8 fan[2]; /* Register value */
119 u8 fan_min[2]; /* Register value */
120 u8 fan_div[2]; /* Register encoding, shifted right */
121 u16 temp; /* Register values, shifted right */
122 u8 temp_hot_max; /* Register value */
123 u8 temp_hot_hyst; /* Register value */
124 u8 temp_os_max; /* Register value */
125 u8 temp_os_hyst; /* Register value */
126 u16 alarms; /* Register encoding, combined */
130 * Functions declaration
133 static int lm80_attach_adapter(struct i2c_adapter *adapter);
134 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind);
135 static void lm80_init_client(struct i2c_client *client);
136 static int lm80_detach_client(struct i2c_client *client);
137 static struct lm80_data *lm80_update_device(struct device *dev);
138 static int lm80_read_value(struct i2c_client *client, u8 reg);
139 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
142 * Driver data (common to all clients)
145 static struct i2c_driver lm80_driver = {
146 .owner = THIS_MODULE,
147 .name = "lm80",
148 .id = I2C_DRIVERID_LM80,
149 .flags = I2C_DF_NOTIFY,
150 .attach_adapter = lm80_attach_adapter,
151 .detach_client = lm80_detach_client,
155 * Sysfs stuff
158 #define show_in(suffix, value) \
159 static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
161 struct lm80_data *data = lm80_update_device(dev); \
162 return sprintf(buf, "%d\n", IN_FROM_REG(data->value)); \
164 show_in(min0, in_min[0]);
165 show_in(min1, in_min[1]);
166 show_in(min2, in_min[2]);
167 show_in(min3, in_min[3]);
168 show_in(min4, in_min[4]);
169 show_in(min5, in_min[5]);
170 show_in(min6, in_min[6]);
171 show_in(max0, in_max[0]);
172 show_in(max1, in_max[1]);
173 show_in(max2, in_max[2]);
174 show_in(max3, in_max[3]);
175 show_in(max4, in_max[4]);
176 show_in(max5, in_max[5]);
177 show_in(max6, in_max[6]);
178 show_in(input0, in[0]);
179 show_in(input1, in[1]);
180 show_in(input2, in[2]);
181 show_in(input3, in[3]);
182 show_in(input4, in[4]);
183 show_in(input5, in[5]);
184 show_in(input6, in[6]);
186 #define set_in(suffix, value, reg) \
187 static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
188 size_t count) \
190 struct i2c_client *client = to_i2c_client(dev); \
191 struct lm80_data *data = i2c_get_clientdata(client); \
192 long val = simple_strtol(buf, NULL, 10); \
194 down(&data->update_lock);\
195 data->value = IN_TO_REG(val); \
196 lm80_write_value(client, reg, data->value); \
197 up(&data->update_lock);\
198 return count; \
200 set_in(min0, in_min[0], LM80_REG_IN_MIN(0));
201 set_in(min1, in_min[1], LM80_REG_IN_MIN(1));
202 set_in(min2, in_min[2], LM80_REG_IN_MIN(2));
203 set_in(min3, in_min[3], LM80_REG_IN_MIN(3));
204 set_in(min4, in_min[4], LM80_REG_IN_MIN(4));
205 set_in(min5, in_min[5], LM80_REG_IN_MIN(5));
206 set_in(min6, in_min[6], LM80_REG_IN_MIN(6));
207 set_in(max0, in_max[0], LM80_REG_IN_MAX(0));
208 set_in(max1, in_max[1], LM80_REG_IN_MAX(1));
209 set_in(max2, in_max[2], LM80_REG_IN_MAX(2));
210 set_in(max3, in_max[3], LM80_REG_IN_MAX(3));
211 set_in(max4, in_max[4], LM80_REG_IN_MAX(4));
212 set_in(max5, in_max[5], LM80_REG_IN_MAX(5));
213 set_in(max6, in_max[6], LM80_REG_IN_MAX(6));
215 #define show_fan(suffix, value, div) \
216 static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
218 struct lm80_data *data = lm80_update_device(dev); \
219 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value, \
220 DIV_FROM_REG(data->div))); \
222 show_fan(min1, fan_min[0], fan_div[0]);
223 show_fan(min2, fan_min[1], fan_div[1]);
224 show_fan(input1, fan[0], fan_div[0]);
225 show_fan(input2, fan[1], fan_div[1]);
227 #define show_fan_div(suffix, value) \
228 static ssize_t show_fan_div##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
230 struct lm80_data *data = lm80_update_device(dev); \
231 return sprintf(buf, "%d\n", DIV_FROM_REG(data->value)); \
233 show_fan_div(1, fan_div[0]);
234 show_fan_div(2, fan_div[1]);
236 #define set_fan(suffix, value, reg, div) \
237 static ssize_t set_fan_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
238 size_t count) \
240 struct i2c_client *client = to_i2c_client(dev); \
241 struct lm80_data *data = i2c_get_clientdata(client); \
242 long val = simple_strtoul(buf, NULL, 10); \
244 down(&data->update_lock);\
245 data->value = FAN_TO_REG(val, DIV_FROM_REG(data->div)); \
246 lm80_write_value(client, reg, data->value); \
247 up(&data->update_lock);\
248 return count; \
250 set_fan(min1, fan_min[0], LM80_REG_FAN_MIN(1), fan_div[0]);
251 set_fan(min2, fan_min[1], LM80_REG_FAN_MIN(2), fan_div[1]);
253 /* Note: we save and restore the fan minimum here, because its value is
254 determined in part by the fan divisor. This follows the principle of
255 least suprise; the user doesn't expect the fan minimum to change just
256 because the divisor changed. */
257 static ssize_t set_fan_div(struct device *dev, const char *buf,
258 size_t count, int nr)
260 struct i2c_client *client = to_i2c_client(dev);
261 struct lm80_data *data = i2c_get_clientdata(client);
262 unsigned long min, val = simple_strtoul(buf, NULL, 10);
263 u8 reg;
265 /* Save fan_min */
266 down(&data->update_lock);
267 min = FAN_FROM_REG(data->fan_min[nr],
268 DIV_FROM_REG(data->fan_div[nr]));
270 switch (val) {
271 case 1: data->fan_div[nr] = 0; break;
272 case 2: data->fan_div[nr] = 1; break;
273 case 4: data->fan_div[nr] = 2; break;
274 case 8: data->fan_div[nr] = 3; break;
275 default:
276 dev_err(&client->dev, "fan_div value %ld not "
277 "supported. Choose one of 1, 2, 4 or 8!\n", val);
278 up(&data->update_lock);
279 return -EINVAL;
282 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
283 | (data->fan_div[nr] << (2 * (nr + 1)));
284 lm80_write_value(client, LM80_REG_FANDIV, reg);
286 /* Restore fan_min */
287 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
288 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
289 up(&data->update_lock);
291 return count;
294 #define set_fan_div(number) \
295 static ssize_t set_fan_div##number(struct device *dev, struct device_attribute *attr, const char *buf, \
296 size_t count) \
298 return set_fan_div(dev, buf, count, number - 1); \
300 set_fan_div(1);
301 set_fan_div(2);
303 static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
305 struct lm80_data *data = lm80_update_device(dev);
306 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
309 #define show_temp(suffix, value) \
310 static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
312 struct lm80_data *data = lm80_update_device(dev); \
313 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
315 show_temp(hot_max, temp_hot_max);
316 show_temp(hot_hyst, temp_hot_hyst);
317 show_temp(os_max, temp_os_max);
318 show_temp(os_hyst, temp_os_hyst);
320 #define set_temp(suffix, value, reg) \
321 static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
322 size_t count) \
324 struct i2c_client *client = to_i2c_client(dev); \
325 struct lm80_data *data = i2c_get_clientdata(client); \
326 long val = simple_strtoul(buf, NULL, 10); \
328 down(&data->update_lock); \
329 data->value = TEMP_LIMIT_TO_REG(val); \
330 lm80_write_value(client, reg, data->value); \
331 up(&data->update_lock); \
332 return count; \
334 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
335 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
336 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
337 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
339 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
341 struct lm80_data *data = lm80_update_device(dev);
342 return sprintf(buf, "%u\n", data->alarms);
345 static DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min0, set_in_min0);
346 static DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min1, set_in_min1);
347 static DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min2, set_in_min2);
348 static DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min3, set_in_min3);
349 static DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min4, set_in_min4);
350 static DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min5, set_in_min5);
351 static DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min6, set_in_min6);
352 static DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max0, set_in_max0);
353 static DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max1, set_in_max1);
354 static DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max2, set_in_max2);
355 static DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max3, set_in_max3);
356 static DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max4, set_in_max4);
357 static DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max5, set_in_max5);
358 static DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max6, set_in_max6);
359 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
360 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
361 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
362 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
363 static DEVICE_ATTR(in4_input, S_IRUGO, show_in_input4, NULL);
364 static DEVICE_ATTR(in5_input, S_IRUGO, show_in_input5, NULL);
365 static DEVICE_ATTR(in6_input, S_IRUGO, show_in_input6, NULL);
366 static DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min1,
367 set_fan_min1);
368 static DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min2,
369 set_fan_min2);
370 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
371 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
372 static DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div1, set_fan_div1);
373 static DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div2, set_fan_div2);
374 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
375 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
376 set_temp_hot_max);
377 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
378 set_temp_hot_hyst);
379 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
380 set_temp_os_max);
381 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
382 set_temp_os_hyst);
383 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
386 * Real code
389 static int lm80_attach_adapter(struct i2c_adapter *adapter)
391 if (!(adapter->class & I2C_CLASS_HWMON))
392 return 0;
393 return i2c_probe(adapter, &addr_data, lm80_detect);
396 static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
398 int i, cur;
399 struct i2c_client *new_client;
400 struct lm80_data *data;
401 int err = 0;
402 const char *name;
404 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
405 goto exit;
407 /* OK. For now, we presume we have a valid client. We now create the
408 client structure, even though we cannot fill it completely yet.
409 But it allows us to access lm80_{read,write}_value. */
410 if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
411 err = -ENOMEM;
412 goto exit;
415 new_client = &data->client;
416 i2c_set_clientdata(new_client, data);
417 new_client->addr = address;
418 new_client->adapter = adapter;
419 new_client->driver = &lm80_driver;
420 new_client->flags = 0;
422 /* Now, we do the remaining detection. It is lousy. */
423 if (lm80_read_value(new_client, LM80_REG_ALARM2) & 0xc0)
424 goto error_free;
425 for (i = 0x2a; i <= 0x3d; i++) {
426 cur = i2c_smbus_read_byte_data(new_client, i);
427 if ((i2c_smbus_read_byte_data(new_client, i + 0x40) != cur)
428 || (i2c_smbus_read_byte_data(new_client, i + 0x80) != cur)
429 || (i2c_smbus_read_byte_data(new_client, i + 0xc0) != cur))
430 goto error_free;
433 /* Determine the chip type - only one kind supported! */
434 kind = lm80;
435 name = "lm80";
437 /* Fill in the remaining client fields and put it into the global list */
438 strlcpy(new_client->name, name, I2C_NAME_SIZE);
439 data->valid = 0;
440 init_MUTEX(&data->update_lock);
442 /* Tell the I2C layer a new client has arrived */
443 if ((err = i2c_attach_client(new_client)))
444 goto error_free;
446 /* Initialize the LM80 chip */
447 lm80_init_client(new_client);
449 /* A few vars need to be filled upon startup */
450 data->fan_min[0] = lm80_read_value(new_client, LM80_REG_FAN_MIN(1));
451 data->fan_min[1] = lm80_read_value(new_client, LM80_REG_FAN_MIN(2));
453 /* Register sysfs hooks */
454 data->class_dev = hwmon_device_register(&new_client->dev);
455 if (IS_ERR(data->class_dev)) {
456 err = PTR_ERR(data->class_dev);
457 goto error_detach;
460 device_create_file(&new_client->dev, &dev_attr_in0_min);
461 device_create_file(&new_client->dev, &dev_attr_in1_min);
462 device_create_file(&new_client->dev, &dev_attr_in2_min);
463 device_create_file(&new_client->dev, &dev_attr_in3_min);
464 device_create_file(&new_client->dev, &dev_attr_in4_min);
465 device_create_file(&new_client->dev, &dev_attr_in5_min);
466 device_create_file(&new_client->dev, &dev_attr_in6_min);
467 device_create_file(&new_client->dev, &dev_attr_in0_max);
468 device_create_file(&new_client->dev, &dev_attr_in1_max);
469 device_create_file(&new_client->dev, &dev_attr_in2_max);
470 device_create_file(&new_client->dev, &dev_attr_in3_max);
471 device_create_file(&new_client->dev, &dev_attr_in4_max);
472 device_create_file(&new_client->dev, &dev_attr_in5_max);
473 device_create_file(&new_client->dev, &dev_attr_in6_max);
474 device_create_file(&new_client->dev, &dev_attr_in0_input);
475 device_create_file(&new_client->dev, &dev_attr_in1_input);
476 device_create_file(&new_client->dev, &dev_attr_in2_input);
477 device_create_file(&new_client->dev, &dev_attr_in3_input);
478 device_create_file(&new_client->dev, &dev_attr_in4_input);
479 device_create_file(&new_client->dev, &dev_attr_in5_input);
480 device_create_file(&new_client->dev, &dev_attr_in6_input);
481 device_create_file(&new_client->dev, &dev_attr_fan1_min);
482 device_create_file(&new_client->dev, &dev_attr_fan2_min);
483 device_create_file(&new_client->dev, &dev_attr_fan1_input);
484 device_create_file(&new_client->dev, &dev_attr_fan2_input);
485 device_create_file(&new_client->dev, &dev_attr_fan1_div);
486 device_create_file(&new_client->dev, &dev_attr_fan2_div);
487 device_create_file(&new_client->dev, &dev_attr_temp1_input);
488 device_create_file(&new_client->dev, &dev_attr_temp1_max);
489 device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
490 device_create_file(&new_client->dev, &dev_attr_temp1_crit);
491 device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
492 device_create_file(&new_client->dev, &dev_attr_alarms);
494 return 0;
496 error_detach:
497 i2c_detach_client(new_client);
498 error_free:
499 kfree(data);
500 exit:
501 return err;
504 static int lm80_detach_client(struct i2c_client *client)
506 struct lm80_data *data = i2c_get_clientdata(client);
507 int err;
509 hwmon_device_unregister(data->class_dev);
511 if ((err = i2c_detach_client(client)))
512 return err;
514 kfree(data);
515 return 0;
518 static int lm80_read_value(struct i2c_client *client, u8 reg)
520 return i2c_smbus_read_byte_data(client, reg);
523 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
525 return i2c_smbus_write_byte_data(client, reg, value);
528 /* Called when we have found a new LM80. */
529 static void lm80_init_client(struct i2c_client *client)
531 /* Reset all except Watchdog values and last conversion values
532 This sets fan-divs to 2, among others. This makes most other
533 initializations unnecessary */
534 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
535 /* Set 11-bit temperature resolution */
536 lm80_write_value(client, LM80_REG_RES, 0x08);
538 /* Start monitoring */
539 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
542 static struct lm80_data *lm80_update_device(struct device *dev)
544 struct i2c_client *client = to_i2c_client(dev);
545 struct lm80_data *data = i2c_get_clientdata(client);
546 int i;
548 down(&data->update_lock);
550 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
551 dev_dbg(&client->dev, "Starting lm80 update\n");
552 for (i = 0; i <= 6; i++) {
553 data->in[i] =
554 lm80_read_value(client, LM80_REG_IN(i));
555 data->in_min[i] =
556 lm80_read_value(client, LM80_REG_IN_MIN(i));
557 data->in_max[i] =
558 lm80_read_value(client, LM80_REG_IN_MAX(i));
560 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
561 data->fan_min[0] =
562 lm80_read_value(client, LM80_REG_FAN_MIN(1));
563 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
564 data->fan_min[1] =
565 lm80_read_value(client, LM80_REG_FAN_MIN(2));
567 data->temp =
568 (lm80_read_value(client, LM80_REG_TEMP) << 8) |
569 (lm80_read_value(client, LM80_REG_RES) & 0xf0);
570 data->temp_os_max =
571 lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
572 data->temp_os_hyst =
573 lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
574 data->temp_hot_max =
575 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
576 data->temp_hot_hyst =
577 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
579 i = lm80_read_value(client, LM80_REG_FANDIV);
580 data->fan_div[0] = (i >> 2) & 0x03;
581 data->fan_div[1] = (i >> 4) & 0x03;
582 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
583 (lm80_read_value(client, LM80_REG_ALARM2) << 8);
584 data->last_updated = jiffies;
585 data->valid = 1;
588 up(&data->update_lock);
590 return data;
593 static int __init sensors_lm80_init(void)
595 return i2c_add_driver(&lm80_driver);
598 static void __exit sensors_lm80_exit(void)
600 i2c_del_driver(&lm80_driver);
603 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
604 "Philip Edelbrock <phil@netroedge.com>");
605 MODULE_DESCRIPTION("LM80 driver");
606 MODULE_LICENSE("GPL");
608 module_init(sensors_lm80_init);
609 module_exit(sensors_lm80_exit);