linux/audit.h: move ptrace.h include to kernel header
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / lm80.c
blob28a8b71f45717a7a9d7ba68e34c3623426948bdb
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/hwmon-sysfs.h>
31 #include <linux/err.h>
32 #include <linux/mutex.h>
34 /* Addresses to scan */
35 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
38 /* Many LM80 constants specified below */
40 /* The LM80 registers */
41 #define LM80_REG_IN_MAX(nr) (0x2a + (nr) * 2)
42 #define LM80_REG_IN_MIN(nr) (0x2b + (nr) * 2)
43 #define LM80_REG_IN(nr) (0x20 + (nr))
45 #define LM80_REG_FAN1 0x28
46 #define LM80_REG_FAN2 0x29
47 #define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
49 #define LM80_REG_TEMP 0x27
50 #define LM80_REG_TEMP_HOT_MAX 0x38
51 #define LM80_REG_TEMP_HOT_HYST 0x39
52 #define LM80_REG_TEMP_OS_MAX 0x3a
53 #define LM80_REG_TEMP_OS_HYST 0x3b
55 #define LM80_REG_CONFIG 0x00
56 #define LM80_REG_ALARM1 0x01
57 #define LM80_REG_ALARM2 0x02
58 #define LM80_REG_MASK1 0x03
59 #define LM80_REG_MASK2 0x04
60 #define LM80_REG_FANDIV 0x05
61 #define LM80_REG_RES 0x06
63 #define LM96080_REG_CONV_RATE 0x07
64 #define LM96080_REG_MAN_ID 0x3e
65 #define LM96080_REG_DEV_ID 0x3f
69 * Conversions. Rounding and limit checking is only done on the TO_REG
70 * variants. Note that you should be a bit careful with which arguments
71 * these macros are called: arguments may be evaluated more than once.
72 * Fixing this is just not worth it.
75 #define IN_TO_REG(val) (SENSORS_LIMIT(((val) + 5) / 10, 0, 255))
76 #define IN_FROM_REG(val) ((val) * 10)
78 static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
80 if (rpm == 0)
81 return 255;
82 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
83 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
86 #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
87 (val) == 255 ? 0 : 1350000/((div) * (val)))
89 static inline long TEMP_FROM_REG(u16 temp)
91 long res;
93 temp >>= 4;
94 if (temp < 0x0800)
95 res = 625 * (long) temp;
96 else
97 res = ((long) temp - 0x01000) * 625;
99 return res / 10;
102 #define TEMP_LIMIT_FROM_REG(val) (((val) > 0x80 ? \
103 (val) - 0x100 : (val)) * 1000)
105 #define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) < 0 ? \
106 ((val) - 500) / 1000 : ((val) + 500) / 1000, 0, 255)
108 #define DIV_FROM_REG(val) (1 << (val))
111 * Client data (each client gets its own)
114 struct lm80_data {
115 struct device *hwmon_dev;
116 struct mutex update_lock;
117 char error; /* !=0 if error occurred during last update */
118 char valid; /* !=0 if following fields are valid */
119 unsigned long last_updated; /* In jiffies */
121 u8 in[7]; /* Register value */
122 u8 in_max[7]; /* Register value */
123 u8 in_min[7]; /* Register value */
124 u8 fan[2]; /* Register value */
125 u8 fan_min[2]; /* Register value */
126 u8 fan_div[2]; /* Register encoding, shifted right */
127 u16 temp; /* Register values, shifted right */
128 u8 temp_hot_max; /* Register value */
129 u8 temp_hot_hyst; /* Register value */
130 u8 temp_os_max; /* Register value */
131 u8 temp_os_hyst; /* Register value */
132 u16 alarms; /* Register encoding, combined */
136 * Functions declaration
139 static int lm80_probe(struct i2c_client *client,
140 const struct i2c_device_id *id);
141 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
142 static void lm80_init_client(struct i2c_client *client);
143 static int lm80_remove(struct i2c_client *client);
144 static struct lm80_data *lm80_update_device(struct device *dev);
145 static int lm80_read_value(struct i2c_client *client, u8 reg);
146 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
149 * Driver data (common to all clients)
152 static const struct i2c_device_id lm80_id[] = {
153 { "lm80", 0 },
154 { "lm96080", 1 },
157 MODULE_DEVICE_TABLE(i2c, lm80_id);
159 static struct i2c_driver lm80_driver = {
160 .class = I2C_CLASS_HWMON,
161 .driver = {
162 .name = "lm80",
164 .probe = lm80_probe,
165 .remove = lm80_remove,
166 .id_table = lm80_id,
167 .detect = lm80_detect,
168 .address_list = normal_i2c,
172 * Sysfs stuff
175 #define show_in(suffix, value) \
176 static ssize_t show_in_##suffix(struct device *dev, \
177 struct device_attribute *attr, char *buf) \
179 int nr = to_sensor_dev_attr(attr)->index; \
180 struct lm80_data *data = lm80_update_device(dev); \
181 if (IS_ERR(data)) \
182 return PTR_ERR(data); \
183 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
185 show_in(min, in_min)
186 show_in(max, in_max)
187 show_in(input, in)
189 #define set_in(suffix, value, reg) \
190 static ssize_t set_in_##suffix(struct device *dev, \
191 struct device_attribute *attr, const char *buf, size_t count) \
193 int nr = to_sensor_dev_attr(attr)->index; \
194 struct i2c_client *client = to_i2c_client(dev); \
195 struct lm80_data *data = i2c_get_clientdata(client); \
196 long val; \
197 int err = kstrtol(buf, 10, &val); \
198 if (err < 0) \
199 return err; \
201 mutex_lock(&data->update_lock);\
202 data->value[nr] = IN_TO_REG(val); \
203 lm80_write_value(client, reg(nr), data->value[nr]); \
204 mutex_unlock(&data->update_lock);\
205 return count; \
207 set_in(min, in_min, LM80_REG_IN_MIN)
208 set_in(max, in_max, LM80_REG_IN_MAX)
210 #define show_fan(suffix, value) \
211 static ssize_t show_fan_##suffix(struct device *dev, \
212 struct device_attribute *attr, char *buf) \
214 int nr = to_sensor_dev_attr(attr)->index; \
215 struct lm80_data *data = lm80_update_device(dev); \
216 if (IS_ERR(data)) \
217 return PTR_ERR(data); \
218 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
219 DIV_FROM_REG(data->fan_div[nr]))); \
221 show_fan(min, fan_min)
222 show_fan(input, fan)
224 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
225 char *buf)
227 int nr = to_sensor_dev_attr(attr)->index;
228 struct lm80_data *data = lm80_update_device(dev);
229 if (IS_ERR(data))
230 return PTR_ERR(data);
231 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
234 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
235 const char *buf, size_t count)
237 int nr = to_sensor_dev_attr(attr)->index;
238 struct i2c_client *client = to_i2c_client(dev);
239 struct lm80_data *data = i2c_get_clientdata(client);
240 unsigned long val;
241 int err = kstrtoul(buf, 10, &val);
242 if (err < 0)
243 return err;
245 mutex_lock(&data->update_lock);
246 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
247 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
248 mutex_unlock(&data->update_lock);
249 return count;
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 surprise; the user doesn't expect the fan minimum to change just
256 * because the divisor changed.
258 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
259 const char *buf, size_t count)
261 int nr = to_sensor_dev_attr(attr)->index;
262 struct i2c_client *client = to_i2c_client(dev);
263 struct lm80_data *data = i2c_get_clientdata(client);
264 unsigned long min, val;
265 u8 reg;
266 int err = kstrtoul(buf, 10, &val);
267 if (err < 0)
268 return err;
270 /* Save fan_min */
271 mutex_lock(&data->update_lock);
272 min = FAN_FROM_REG(data->fan_min[nr],
273 DIV_FROM_REG(data->fan_div[nr]));
275 switch (val) {
276 case 1:
277 data->fan_div[nr] = 0;
278 break;
279 case 2:
280 data->fan_div[nr] = 1;
281 break;
282 case 4:
283 data->fan_div[nr] = 2;
284 break;
285 case 8:
286 data->fan_div[nr] = 3;
287 break;
288 default:
289 dev_err(&client->dev, "fan_div value %ld not "
290 "supported. Choose one of 1, 2, 4 or 8!\n", val);
291 mutex_unlock(&data->update_lock);
292 return -EINVAL;
295 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
296 | (data->fan_div[nr] << (2 * (nr + 1)));
297 lm80_write_value(client, LM80_REG_FANDIV, reg);
299 /* Restore fan_min */
300 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
301 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
302 mutex_unlock(&data->update_lock);
304 return count;
307 static ssize_t show_temp_input1(struct device *dev,
308 struct device_attribute *attr, char *buf)
310 struct lm80_data *data = lm80_update_device(dev);
311 if (IS_ERR(data))
312 return PTR_ERR(data);
313 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
316 #define show_temp(suffix, value) \
317 static ssize_t show_temp_##suffix(struct device *dev, \
318 struct device_attribute *attr, char *buf) \
320 struct lm80_data *data = lm80_update_device(dev); \
321 if (IS_ERR(data)) \
322 return PTR_ERR(data); \
323 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
325 show_temp(hot_max, temp_hot_max);
326 show_temp(hot_hyst, temp_hot_hyst);
327 show_temp(os_max, temp_os_max);
328 show_temp(os_hyst, temp_os_hyst);
330 #define set_temp(suffix, value, reg) \
331 static ssize_t set_temp_##suffix(struct device *dev, \
332 struct device_attribute *attr, const char *buf, size_t count) \
334 struct i2c_client *client = to_i2c_client(dev); \
335 struct lm80_data *data = i2c_get_clientdata(client); \
336 long val; \
337 int err = kstrtol(buf, 10, &val); \
338 if (err < 0) \
339 return err; \
341 mutex_lock(&data->update_lock); \
342 data->value = TEMP_LIMIT_TO_REG(val); \
343 lm80_write_value(client, reg, data->value); \
344 mutex_unlock(&data->update_lock); \
345 return count; \
347 set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
348 set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
349 set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
350 set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
352 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
353 char *buf)
355 struct lm80_data *data = lm80_update_device(dev);
356 if (IS_ERR(data))
357 return PTR_ERR(data);
358 return sprintf(buf, "%u\n", data->alarms);
361 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
362 char *buf)
364 int bitnr = to_sensor_dev_attr(attr)->index;
365 struct lm80_data *data = lm80_update_device(dev);
366 if (IS_ERR(data))
367 return PTR_ERR(data);
368 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
371 static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
372 show_in_min, set_in_min, 0);
373 static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
374 show_in_min, set_in_min, 1);
375 static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
376 show_in_min, set_in_min, 2);
377 static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
378 show_in_min, set_in_min, 3);
379 static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
380 show_in_min, set_in_min, 4);
381 static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
382 show_in_min, set_in_min, 5);
383 static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
384 show_in_min, set_in_min, 6);
385 static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
386 show_in_max, set_in_max, 0);
387 static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
388 show_in_max, set_in_max, 1);
389 static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
390 show_in_max, set_in_max, 2);
391 static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
392 show_in_max, set_in_max, 3);
393 static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
394 show_in_max, set_in_max, 4);
395 static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
396 show_in_max, set_in_max, 5);
397 static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
398 show_in_max, set_in_max, 6);
399 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
400 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
401 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
402 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
403 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
404 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
405 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
406 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
407 show_fan_min, set_fan_min, 0);
408 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
409 show_fan_min, set_fan_min, 1);
410 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
411 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
412 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
413 show_fan_div, set_fan_div, 0);
414 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
415 show_fan_div, set_fan_div, 1);
416 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
417 static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
418 set_temp_hot_max);
419 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
420 set_temp_hot_hyst);
421 static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
422 set_temp_os_max);
423 static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
424 set_temp_os_hyst);
425 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
426 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
427 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
428 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
429 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
430 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
431 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
432 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
433 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
434 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
435 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
436 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
439 * Real code
442 static struct attribute *lm80_attributes[] = {
443 &sensor_dev_attr_in0_min.dev_attr.attr,
444 &sensor_dev_attr_in1_min.dev_attr.attr,
445 &sensor_dev_attr_in2_min.dev_attr.attr,
446 &sensor_dev_attr_in3_min.dev_attr.attr,
447 &sensor_dev_attr_in4_min.dev_attr.attr,
448 &sensor_dev_attr_in5_min.dev_attr.attr,
449 &sensor_dev_attr_in6_min.dev_attr.attr,
450 &sensor_dev_attr_in0_max.dev_attr.attr,
451 &sensor_dev_attr_in1_max.dev_attr.attr,
452 &sensor_dev_attr_in2_max.dev_attr.attr,
453 &sensor_dev_attr_in3_max.dev_attr.attr,
454 &sensor_dev_attr_in4_max.dev_attr.attr,
455 &sensor_dev_attr_in5_max.dev_attr.attr,
456 &sensor_dev_attr_in6_max.dev_attr.attr,
457 &sensor_dev_attr_in0_input.dev_attr.attr,
458 &sensor_dev_attr_in1_input.dev_attr.attr,
459 &sensor_dev_attr_in2_input.dev_attr.attr,
460 &sensor_dev_attr_in3_input.dev_attr.attr,
461 &sensor_dev_attr_in4_input.dev_attr.attr,
462 &sensor_dev_attr_in5_input.dev_attr.attr,
463 &sensor_dev_attr_in6_input.dev_attr.attr,
464 &sensor_dev_attr_fan1_min.dev_attr.attr,
465 &sensor_dev_attr_fan2_min.dev_attr.attr,
466 &sensor_dev_attr_fan1_input.dev_attr.attr,
467 &sensor_dev_attr_fan2_input.dev_attr.attr,
468 &sensor_dev_attr_fan1_div.dev_attr.attr,
469 &sensor_dev_attr_fan2_div.dev_attr.attr,
470 &dev_attr_temp1_input.attr,
471 &dev_attr_temp1_max.attr,
472 &dev_attr_temp1_max_hyst.attr,
473 &dev_attr_temp1_crit.attr,
474 &dev_attr_temp1_crit_hyst.attr,
475 &dev_attr_alarms.attr,
476 &sensor_dev_attr_in0_alarm.dev_attr.attr,
477 &sensor_dev_attr_in1_alarm.dev_attr.attr,
478 &sensor_dev_attr_in2_alarm.dev_attr.attr,
479 &sensor_dev_attr_in3_alarm.dev_attr.attr,
480 &sensor_dev_attr_in4_alarm.dev_attr.attr,
481 &sensor_dev_attr_in5_alarm.dev_attr.attr,
482 &sensor_dev_attr_in6_alarm.dev_attr.attr,
483 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
484 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
485 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
486 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
487 NULL
490 static const struct attribute_group lm80_group = {
491 .attrs = lm80_attributes,
494 /* Return 0 if detection is successful, -ENODEV otherwise */
495 static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
497 struct i2c_adapter *adapter = client->adapter;
498 int i, cur, man_id, dev_id;
499 const char *name = NULL;
501 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
502 return -ENODEV;
504 /* First check for unused bits, common to both chip types */
505 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
506 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
507 return -ENODEV;
510 * The LM96080 has manufacturer and stepping/die rev registers so we
511 * can just check that. The LM80 does not have such registers so we
512 * have to use a more expensive trick.
514 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
515 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
516 if (man_id == 0x01 && dev_id == 0x08) {
517 /* Check more unused bits for confirmation */
518 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
519 return -ENODEV;
521 name = "lm96080";
522 } else {
523 /* Check 6-bit addressing */
524 for (i = 0x2a; i <= 0x3d; i++) {
525 cur = i2c_smbus_read_byte_data(client, i);
526 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
527 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
528 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
529 return -ENODEV;
532 name = "lm80";
535 strlcpy(info->type, name, I2C_NAME_SIZE);
537 return 0;
540 static int lm80_probe(struct i2c_client *client,
541 const struct i2c_device_id *id)
543 struct lm80_data *data;
544 int err;
546 data = devm_kzalloc(&client->dev, sizeof(struct lm80_data), GFP_KERNEL);
547 if (!data)
548 return -ENOMEM;
550 i2c_set_clientdata(client, data);
551 mutex_init(&data->update_lock);
553 /* Initialize the LM80 chip */
554 lm80_init_client(client);
556 /* A few vars need to be filled upon startup */
557 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
558 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
560 /* Register sysfs hooks */
561 err = sysfs_create_group(&client->dev.kobj, &lm80_group);
562 if (err)
563 return err;
565 data->hwmon_dev = hwmon_device_register(&client->dev);
566 if (IS_ERR(data->hwmon_dev)) {
567 err = PTR_ERR(data->hwmon_dev);
568 goto error_remove;
571 return 0;
573 error_remove:
574 sysfs_remove_group(&client->dev.kobj, &lm80_group);
575 return err;
578 static int lm80_remove(struct i2c_client *client)
580 struct lm80_data *data = i2c_get_clientdata(client);
582 hwmon_device_unregister(data->hwmon_dev);
583 sysfs_remove_group(&client->dev.kobj, &lm80_group);
585 return 0;
588 static int lm80_read_value(struct i2c_client *client, u8 reg)
590 return i2c_smbus_read_byte_data(client, reg);
593 static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
595 return i2c_smbus_write_byte_data(client, reg, value);
598 /* Called when we have found a new LM80. */
599 static void lm80_init_client(struct i2c_client *client)
602 * Reset all except Watchdog values and last conversion values
603 * This sets fan-divs to 2, among others. This makes most other
604 * initializations unnecessary
606 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
607 /* Set 11-bit temperature resolution */
608 lm80_write_value(client, LM80_REG_RES, 0x08);
610 /* Start monitoring */
611 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
614 static struct lm80_data *lm80_update_device(struct device *dev)
616 struct i2c_client *client = to_i2c_client(dev);
617 struct lm80_data *data = i2c_get_clientdata(client);
618 int i;
619 int rv;
620 int prev_rv;
621 struct lm80_data *ret = data;
623 mutex_lock(&data->update_lock);
625 if (data->error)
626 lm80_init_client(client);
628 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
629 dev_dbg(&client->dev, "Starting lm80 update\n");
630 for (i = 0; i <= 6; i++) {
631 rv = lm80_read_value(client, LM80_REG_IN(i));
632 if (rv < 0)
633 goto abort;
634 data->in[i] = rv;
636 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
637 if (rv < 0)
638 goto abort;
639 data->in_min[i] = rv;
641 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
642 if (rv < 0)
643 goto abort;
644 data->in_max[i] = rv;
647 rv = lm80_read_value(client, LM80_REG_FAN1);
648 if (rv < 0)
649 goto abort;
650 data->fan[0] = rv;
652 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
653 if (rv < 0)
654 goto abort;
655 data->fan_min[0] = rv;
657 rv = lm80_read_value(client, LM80_REG_FAN2);
658 if (rv < 0)
659 goto abort;
660 data->fan[1] = rv;
662 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
663 if (rv < 0)
664 goto abort;
665 data->fan_min[1] = rv;
667 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
668 if (rv < 0)
669 goto abort;
670 rv = lm80_read_value(client, LM80_REG_RES);
671 if (rv < 0)
672 goto abort;
673 data->temp = (prev_rv << 8) | (rv & 0xf0);
675 rv = lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
676 if (rv < 0)
677 goto abort;
678 data->temp_os_max = rv;
680 rv = lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
681 if (rv < 0)
682 goto abort;
683 data->temp_os_hyst = rv;
685 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
686 if (rv < 0)
687 goto abort;
688 data->temp_hot_max = rv;
690 rv = lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
691 if (rv < 0)
692 goto abort;
693 data->temp_hot_hyst = rv;
695 rv = lm80_read_value(client, LM80_REG_FANDIV);
696 if (rv < 0)
697 goto abort;
698 data->fan_div[0] = (rv >> 2) & 0x03;
699 data->fan_div[1] = (rv >> 4) & 0x03;
701 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
702 if (rv < 0)
703 goto abort;
704 rv = lm80_read_value(client, LM80_REG_ALARM2);
705 if (rv < 0)
706 goto abort;
707 data->alarms = prev_rv + (rv << 8);
709 data->last_updated = jiffies;
710 data->valid = 1;
711 data->error = 0;
713 goto done;
715 abort:
716 ret = ERR_PTR(rv);
717 data->valid = 0;
718 data->error = 1;
720 done:
721 mutex_unlock(&data->update_lock);
723 return ret;
726 module_i2c_driver(lm80_driver);
728 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
729 "Philip Edelbrock <phil@netroedge.com>");
730 MODULE_DESCRIPTION("LM80 driver");
731 MODULE_LICENSE("GPL");