Loading...
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>
6 *
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
8 *
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.
13 *
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.
18 *
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.
22 */
23
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>
33
34/* Addresses to scan */
35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
37
38/* Many LM80 constants specified below */
39
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))
44
45#define LM80_REG_FAN1 0x28
46#define LM80_REG_FAN2 0x29
47#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
48
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
54
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
62
63
64/* Conversions. Rounding and limit checking is only done on the TO_REG
65 variants. Note that you should be a bit careful with which arguments
66 these macros are called: arguments may be evaluated more than once.
67 Fixing this is just not worth it. */
68
69#define IN_TO_REG(val) (SENSORS_LIMIT(((val)+5)/10,0,255))
70#define IN_FROM_REG(val) ((val)*10)
71
72static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
73{
74 if (rpm == 0)
75 return 255;
76 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
77 return SENSORS_LIMIT((1350000 + rpm*div / 2) / (rpm*div), 1, 254);
78}
79
80#define FAN_FROM_REG(val,div) ((val)==0?-1:\
81 (val)==255?0:1350000/((div)*(val)))
82
83static inline long TEMP_FROM_REG(u16 temp)
84{
85 long res;
86
87 temp >>= 4;
88 if (temp < 0x0800)
89 res = 625 * (long) temp;
90 else
91 res = ((long) temp - 0x01000) * 625;
92
93 return res / 10;
94}
95
96#define TEMP_LIMIT_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
97
98#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val)<0?\
99 ((val)-500)/1000:((val)+500)/1000,0,255)
100
101#define DIV_FROM_REG(val) (1 << (val))
102
103/*
104 * Client data (each client gets its own)
105 */
106
107struct lm80_data {
108 struct device *hwmon_dev;
109 struct mutex update_lock;
110 char valid; /* !=0 if following fields are valid */
111 unsigned long last_updated; /* In jiffies */
112
113 u8 in[7]; /* Register value */
114 u8 in_max[7]; /* Register value */
115 u8 in_min[7]; /* Register value */
116 u8 fan[2]; /* Register value */
117 u8 fan_min[2]; /* Register value */
118 u8 fan_div[2]; /* Register encoding, shifted right */
119 u16 temp; /* Register values, shifted right */
120 u8 temp_hot_max; /* Register value */
121 u8 temp_hot_hyst; /* Register value */
122 u8 temp_os_max; /* Register value */
123 u8 temp_os_hyst; /* Register value */
124 u16 alarms; /* Register encoding, combined */
125};
126
127/*
128 * Functions declaration
129 */
130
131static int lm80_probe(struct i2c_client *client,
132 const struct i2c_device_id *id);
133static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info);
134static void lm80_init_client(struct i2c_client *client);
135static int lm80_remove(struct i2c_client *client);
136static struct lm80_data *lm80_update_device(struct device *dev);
137static int lm80_read_value(struct i2c_client *client, u8 reg);
138static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
139
140/*
141 * Driver data (common to all clients)
142 */
143
144static const struct i2c_device_id lm80_id[] = {
145 { "lm80", 0 },
146 { }
147};
148MODULE_DEVICE_TABLE(i2c, lm80_id);
149
150static struct i2c_driver lm80_driver = {
151 .class = I2C_CLASS_HWMON,
152 .driver = {
153 .name = "lm80",
154 },
155 .probe = lm80_probe,
156 .remove = lm80_remove,
157 .id_table = lm80_id,
158 .detect = lm80_detect,
159 .address_list = normal_i2c,
160};
161
162/*
163 * Sysfs stuff
164 */
165
166#define show_in(suffix, value) \
167static ssize_t show_in_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
168{ \
169 int nr = to_sensor_dev_attr(attr)->index; \
170 struct lm80_data *data = lm80_update_device(dev); \
171 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
172}
173show_in(min, in_min)
174show_in(max, in_max)
175show_in(input, in)
176
177#define set_in(suffix, value, reg) \
178static ssize_t set_in_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
179 size_t count) \
180{ \
181 int nr = to_sensor_dev_attr(attr)->index; \
182 struct i2c_client *client = to_i2c_client(dev); \
183 struct lm80_data *data = i2c_get_clientdata(client); \
184 long val = simple_strtol(buf, NULL, 10); \
185 \
186 mutex_lock(&data->update_lock);\
187 data->value[nr] = IN_TO_REG(val); \
188 lm80_write_value(client, reg(nr), data->value[nr]); \
189 mutex_unlock(&data->update_lock);\
190 return count; \
191}
192set_in(min, in_min, LM80_REG_IN_MIN)
193set_in(max, in_max, LM80_REG_IN_MAX)
194
195#define show_fan(suffix, value) \
196static ssize_t show_fan_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
197{ \
198 int nr = to_sensor_dev_attr(attr)->index; \
199 struct lm80_data *data = lm80_update_device(dev); \
200 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
201 DIV_FROM_REG(data->fan_div[nr]))); \
202}
203show_fan(min, fan_min)
204show_fan(input, fan)
205
206static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
207 char *buf)
208{
209 int nr = to_sensor_dev_attr(attr)->index;
210 struct lm80_data *data = lm80_update_device(dev);
211 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
212}
213
214static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
216{
217 int nr = to_sensor_dev_attr(attr)->index;
218 struct i2c_client *client = to_i2c_client(dev);
219 struct lm80_data *data = i2c_get_clientdata(client);
220 long val = simple_strtoul(buf, NULL, 10);
221
222 mutex_lock(&data->update_lock);
223 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
224 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
225 mutex_unlock(&data->update_lock);
226 return count;
227}
228
229/* Note: we save and restore the fan minimum here, because its value is
230 determined in part by the fan divisor. This follows the principle of
231 least surprise; the user doesn't expect the fan minimum to change just
232 because the divisor changed. */
233static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
235{
236 int nr = to_sensor_dev_attr(attr)->index;
237 struct i2c_client *client = to_i2c_client(dev);
238 struct lm80_data *data = i2c_get_clientdata(client);
239 unsigned long min, val = simple_strtoul(buf, NULL, 10);
240 u8 reg;
241
242 /* Save fan_min */
243 mutex_lock(&data->update_lock);
244 min = FAN_FROM_REG(data->fan_min[nr],
245 DIV_FROM_REG(data->fan_div[nr]));
246
247 switch (val) {
248 case 1: data->fan_div[nr] = 0; break;
249 case 2: data->fan_div[nr] = 1; break;
250 case 4: data->fan_div[nr] = 2; break;
251 case 8: data->fan_div[nr] = 3; break;
252 default:
253 dev_err(&client->dev, "fan_div value %ld not "
254 "supported. Choose one of 1, 2, 4 or 8!\n", val);
255 mutex_unlock(&data->update_lock);
256 return -EINVAL;
257 }
258
259 reg = (lm80_read_value(client, LM80_REG_FANDIV) & ~(3 << (2 * (nr + 1))))
260 | (data->fan_div[nr] << (2 * (nr + 1)));
261 lm80_write_value(client, LM80_REG_FANDIV, reg);
262
263 /* Restore fan_min */
264 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
265 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1), data->fan_min[nr]);
266 mutex_unlock(&data->update_lock);
267
268 return count;
269}
270
271static ssize_t show_temp_input1(struct device *dev, struct device_attribute *attr, char *buf)
272{
273 struct lm80_data *data = lm80_update_device(dev);
274 return sprintf(buf, "%ld\n", TEMP_FROM_REG(data->temp));
275}
276
277#define show_temp(suffix, value) \
278static ssize_t show_temp_##suffix(struct device *dev, struct device_attribute *attr, char *buf) \
279{ \
280 struct lm80_data *data = lm80_update_device(dev); \
281 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
282}
283show_temp(hot_max, temp_hot_max);
284show_temp(hot_hyst, temp_hot_hyst);
285show_temp(os_max, temp_os_max);
286show_temp(os_hyst, temp_os_hyst);
287
288#define set_temp(suffix, value, reg) \
289static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
290 size_t count) \
291{ \
292 struct i2c_client *client = to_i2c_client(dev); \
293 struct lm80_data *data = i2c_get_clientdata(client); \
294 long val = simple_strtoul(buf, NULL, 10); \
295 \
296 mutex_lock(&data->update_lock); \
297 data->value = TEMP_LIMIT_TO_REG(val); \
298 lm80_write_value(client, reg, data->value); \
299 mutex_unlock(&data->update_lock); \
300 return count; \
301}
302set_temp(hot_max, temp_hot_max, LM80_REG_TEMP_HOT_MAX);
303set_temp(hot_hyst, temp_hot_hyst, LM80_REG_TEMP_HOT_HYST);
304set_temp(os_max, temp_os_max, LM80_REG_TEMP_OS_MAX);
305set_temp(os_hyst, temp_os_hyst, LM80_REG_TEMP_OS_HYST);
306
307static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct lm80_data *data = lm80_update_device(dev);
311 return sprintf(buf, "%u\n", data->alarms);
312}
313
314static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
315 char *buf)
316{
317 int bitnr = to_sensor_dev_attr(attr)->index;
318 struct lm80_data *data = lm80_update_device(dev);
319 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
320}
321
322static SENSOR_DEVICE_ATTR(in0_min, S_IWUSR | S_IRUGO,
323 show_in_min, set_in_min, 0);
324static SENSOR_DEVICE_ATTR(in1_min, S_IWUSR | S_IRUGO,
325 show_in_min, set_in_min, 1);
326static SENSOR_DEVICE_ATTR(in2_min, S_IWUSR | S_IRUGO,
327 show_in_min, set_in_min, 2);
328static SENSOR_DEVICE_ATTR(in3_min, S_IWUSR | S_IRUGO,
329 show_in_min, set_in_min, 3);
330static SENSOR_DEVICE_ATTR(in4_min, S_IWUSR | S_IRUGO,
331 show_in_min, set_in_min, 4);
332static SENSOR_DEVICE_ATTR(in5_min, S_IWUSR | S_IRUGO,
333 show_in_min, set_in_min, 5);
334static SENSOR_DEVICE_ATTR(in6_min, S_IWUSR | S_IRUGO,
335 show_in_min, set_in_min, 6);
336static SENSOR_DEVICE_ATTR(in0_max, S_IWUSR | S_IRUGO,
337 show_in_max, set_in_max, 0);
338static SENSOR_DEVICE_ATTR(in1_max, S_IWUSR | S_IRUGO,
339 show_in_max, set_in_max, 1);
340static SENSOR_DEVICE_ATTR(in2_max, S_IWUSR | S_IRUGO,
341 show_in_max, set_in_max, 2);
342static SENSOR_DEVICE_ATTR(in3_max, S_IWUSR | S_IRUGO,
343 show_in_max, set_in_max, 3);
344static SENSOR_DEVICE_ATTR(in4_max, S_IWUSR | S_IRUGO,
345 show_in_max, set_in_max, 4);
346static SENSOR_DEVICE_ATTR(in5_max, S_IWUSR | S_IRUGO,
347 show_in_max, set_in_max, 5);
348static SENSOR_DEVICE_ATTR(in6_max, S_IWUSR | S_IRUGO,
349 show_in_max, set_in_max, 6);
350static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, show_in_input, NULL, 0);
351static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_in_input, NULL, 1);
352static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_in_input, NULL, 2);
353static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_in_input, NULL, 3);
354static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_in_input, NULL, 4);
355static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, show_in_input, NULL, 5);
356static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, show_in_input, NULL, 6);
357static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO,
358 show_fan_min, set_fan_min, 0);
359static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR | S_IRUGO,
360 show_fan_min, set_fan_min, 1);
361static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
362static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
363static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
364 show_fan_div, set_fan_div, 0);
365static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
366 show_fan_div, set_fan_div, 1);
367static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
368static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_hot_max,
369 set_temp_hot_max);
370static DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_hot_hyst,
371 set_temp_hot_hyst);
372static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_os_max,
373 set_temp_os_max);
374static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_os_hyst,
375 set_temp_os_hyst);
376static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
377static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
378static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
379static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
380static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
381static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
382static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
383static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
384static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
385static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
386static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
387static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
388
389/*
390 * Real code
391 */
392
393static struct attribute *lm80_attributes[] = {
394 &sensor_dev_attr_in0_min.dev_attr.attr,
395 &sensor_dev_attr_in1_min.dev_attr.attr,
396 &sensor_dev_attr_in2_min.dev_attr.attr,
397 &sensor_dev_attr_in3_min.dev_attr.attr,
398 &sensor_dev_attr_in4_min.dev_attr.attr,
399 &sensor_dev_attr_in5_min.dev_attr.attr,
400 &sensor_dev_attr_in6_min.dev_attr.attr,
401 &sensor_dev_attr_in0_max.dev_attr.attr,
402 &sensor_dev_attr_in1_max.dev_attr.attr,
403 &sensor_dev_attr_in2_max.dev_attr.attr,
404 &sensor_dev_attr_in3_max.dev_attr.attr,
405 &sensor_dev_attr_in4_max.dev_attr.attr,
406 &sensor_dev_attr_in5_max.dev_attr.attr,
407 &sensor_dev_attr_in6_max.dev_attr.attr,
408 &sensor_dev_attr_in0_input.dev_attr.attr,
409 &sensor_dev_attr_in1_input.dev_attr.attr,
410 &sensor_dev_attr_in2_input.dev_attr.attr,
411 &sensor_dev_attr_in3_input.dev_attr.attr,
412 &sensor_dev_attr_in4_input.dev_attr.attr,
413 &sensor_dev_attr_in5_input.dev_attr.attr,
414 &sensor_dev_attr_in6_input.dev_attr.attr,
415 &sensor_dev_attr_fan1_min.dev_attr.attr,
416 &sensor_dev_attr_fan2_min.dev_attr.attr,
417 &sensor_dev_attr_fan1_input.dev_attr.attr,
418 &sensor_dev_attr_fan2_input.dev_attr.attr,
419 &sensor_dev_attr_fan1_div.dev_attr.attr,
420 &sensor_dev_attr_fan2_div.dev_attr.attr,
421 &dev_attr_temp1_input.attr,
422 &dev_attr_temp1_max.attr,
423 &dev_attr_temp1_max_hyst.attr,
424 &dev_attr_temp1_crit.attr,
425 &dev_attr_temp1_crit_hyst.attr,
426 &dev_attr_alarms.attr,
427 &sensor_dev_attr_in0_alarm.dev_attr.attr,
428 &sensor_dev_attr_in1_alarm.dev_attr.attr,
429 &sensor_dev_attr_in2_alarm.dev_attr.attr,
430 &sensor_dev_attr_in3_alarm.dev_attr.attr,
431 &sensor_dev_attr_in4_alarm.dev_attr.attr,
432 &sensor_dev_attr_in5_alarm.dev_attr.attr,
433 &sensor_dev_attr_in6_alarm.dev_attr.attr,
434 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
435 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
436 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
437 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
438 NULL
439};
440
441static const struct attribute_group lm80_group = {
442 .attrs = lm80_attributes,
443};
444
445/* Return 0 if detection is successful, -ENODEV otherwise */
446static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
447{
448 struct i2c_adapter *adapter = client->adapter;
449 int i, cur;
450
451 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
452 return -ENODEV;
453
454 /* Now, we do the remaining detection. It is lousy. */
455 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
456 return -ENODEV;
457 for (i = 0x2a; i <= 0x3d; i++) {
458 cur = i2c_smbus_read_byte_data(client, i);
459 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
460 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
461 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
462 return -ENODEV;
463 }
464
465 strlcpy(info->type, "lm80", I2C_NAME_SIZE);
466
467 return 0;
468}
469
470static int lm80_probe(struct i2c_client *client,
471 const struct i2c_device_id *id)
472{
473 struct lm80_data *data;
474 int err;
475
476 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
477 if (!data) {
478 err = -ENOMEM;
479 goto exit;
480 }
481
482 i2c_set_clientdata(client, data);
483 mutex_init(&data->update_lock);
484
485 /* Initialize the LM80 chip */
486 lm80_init_client(client);
487
488 /* A few vars need to be filled upon startup */
489 data->fan_min[0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
490 data->fan_min[1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
491
492 /* Register sysfs hooks */
493 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
494 goto error_free;
495
496 data->hwmon_dev = hwmon_device_register(&client->dev);
497 if (IS_ERR(data->hwmon_dev)) {
498 err = PTR_ERR(data->hwmon_dev);
499 goto error_remove;
500 }
501
502 return 0;
503
504error_remove:
505 sysfs_remove_group(&client->dev.kobj, &lm80_group);
506error_free:
507 kfree(data);
508exit:
509 return err;
510}
511
512static int lm80_remove(struct i2c_client *client)
513{
514 struct lm80_data *data = i2c_get_clientdata(client);
515
516 hwmon_device_unregister(data->hwmon_dev);
517 sysfs_remove_group(&client->dev.kobj, &lm80_group);
518
519 kfree(data);
520 return 0;
521}
522
523static int lm80_read_value(struct i2c_client *client, u8 reg)
524{
525 return i2c_smbus_read_byte_data(client, reg);
526}
527
528static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
529{
530 return i2c_smbus_write_byte_data(client, reg, value);
531}
532
533/* Called when we have found a new LM80. */
534static void lm80_init_client(struct i2c_client *client)
535{
536 /* Reset all except Watchdog values and last conversion values
537 This sets fan-divs to 2, among others. This makes most other
538 initializations unnecessary */
539 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
540 /* Set 11-bit temperature resolution */
541 lm80_write_value(client, LM80_REG_RES, 0x08);
542
543 /* Start monitoring */
544 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
545}
546
547static struct lm80_data *lm80_update_device(struct device *dev)
548{
549 struct i2c_client *client = to_i2c_client(dev);
550 struct lm80_data *data = i2c_get_clientdata(client);
551 int i;
552
553 mutex_lock(&data->update_lock);
554
555 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
556 dev_dbg(&client->dev, "Starting lm80 update\n");
557 for (i = 0; i <= 6; i++) {
558 data->in[i] =
559 lm80_read_value(client, LM80_REG_IN(i));
560 data->in_min[i] =
561 lm80_read_value(client, LM80_REG_IN_MIN(i));
562 data->in_max[i] =
563 lm80_read_value(client, LM80_REG_IN_MAX(i));
564 }
565 data->fan[0] = lm80_read_value(client, LM80_REG_FAN1);
566 data->fan_min[0] =
567 lm80_read_value(client, LM80_REG_FAN_MIN(1));
568 data->fan[1] = lm80_read_value(client, LM80_REG_FAN2);
569 data->fan_min[1] =
570 lm80_read_value(client, LM80_REG_FAN_MIN(2));
571
572 data->temp =
573 (lm80_read_value(client, LM80_REG_TEMP) << 8) |
574 (lm80_read_value(client, LM80_REG_RES) & 0xf0);
575 data->temp_os_max =
576 lm80_read_value(client, LM80_REG_TEMP_OS_MAX);
577 data->temp_os_hyst =
578 lm80_read_value(client, LM80_REG_TEMP_OS_HYST);
579 data->temp_hot_max =
580 lm80_read_value(client, LM80_REG_TEMP_HOT_MAX);
581 data->temp_hot_hyst =
582 lm80_read_value(client, LM80_REG_TEMP_HOT_HYST);
583
584 i = lm80_read_value(client, LM80_REG_FANDIV);
585 data->fan_div[0] = (i >> 2) & 0x03;
586 data->fan_div[1] = (i >> 4) & 0x03;
587 data->alarms = lm80_read_value(client, LM80_REG_ALARM1) +
588 (lm80_read_value(client, LM80_REG_ALARM2) << 8);
589 data->last_updated = jiffies;
590 data->valid = 1;
591 }
592
593 mutex_unlock(&data->update_lock);
594
595 return data;
596}
597
598static int __init sensors_lm80_init(void)
599{
600 return i2c_add_driver(&lm80_driver);
601}
602
603static void __exit sensors_lm80_exit(void)
604{
605 i2c_del_driver(&lm80_driver);
606}
607
608MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
609 "Philip Edelbrock <phil@netroedge.com>");
610MODULE_DESCRIPTION("LM80 driver");
611MODULE_LICENSE("GPL");
612
613module_init(sensors_lm80_init);
614module_exit(sensors_lm80_exit);
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>
6 *
7 * Ported to Linux 2.6 by Tiago Sousa <mirage@kaotik.org>
8 *
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.
13 *
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.
18 *
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.
22 */
23
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>
33
34/* Addresses to scan */
35static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
36 0x2e, 0x2f, I2C_CLIENT_END };
37
38/* Many LM80 constants specified below */
39
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))
44
45#define LM80_REG_FAN1 0x28
46#define LM80_REG_FAN2 0x29
47#define LM80_REG_FAN_MIN(nr) (0x3b + (nr))
48
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
54
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
62
63#define LM96080_REG_CONV_RATE 0x07
64#define LM96080_REG_MAN_ID 0x3e
65#define LM96080_REG_DEV_ID 0x3f
66
67
68/*
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.
73 */
74
75#define IN_TO_REG(val) (clamp_val(((val) + 5) / 10, 0, 255))
76#define IN_FROM_REG(val) ((val) * 10)
77
78static inline unsigned char FAN_TO_REG(unsigned rpm, unsigned div)
79{
80 if (rpm == 0)
81 return 255;
82 rpm = clamp_val(rpm, 1, 1000000);
83 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
84}
85
86#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \
87 (val) == 255 ? 0 : 1350000/((div) * (val)))
88
89#define TEMP_FROM_REG(reg) ((reg) * 125 / 32)
90#define TEMP_TO_REG(temp) (DIV_ROUND_CLOSEST(clamp_val((temp), \
91 -128000, 127000), 1000) << 8)
92
93#define DIV_FROM_REG(val) (1 << (val))
94
95enum temp_index {
96 t_input = 0,
97 t_hot_max,
98 t_hot_hyst,
99 t_os_max,
100 t_os_hyst,
101 t_num_temp
102};
103
104static const u8 temp_regs[t_num_temp] = {
105 [t_input] = LM80_REG_TEMP,
106 [t_hot_max] = LM80_REG_TEMP_HOT_MAX,
107 [t_hot_hyst] = LM80_REG_TEMP_HOT_HYST,
108 [t_os_max] = LM80_REG_TEMP_OS_MAX,
109 [t_os_hyst] = LM80_REG_TEMP_OS_HYST,
110};
111
112enum in_index {
113 i_input = 0,
114 i_max,
115 i_min,
116 i_num_in
117};
118
119enum fan_index {
120 f_input,
121 f_min,
122 f_num_fan
123};
124
125/*
126 * Client data (each client gets its own)
127 */
128
129struct lm80_data {
130 struct i2c_client *client;
131 struct mutex update_lock;
132 char error; /* !=0 if error occurred during last update */
133 char valid; /* !=0 if following fields are valid */
134 unsigned long last_updated; /* In jiffies */
135
136 u8 in[i_num_in][7]; /* Register value, 1st index is enum in_index */
137 u8 fan[f_num_fan][2]; /* Register value, 1st index enum fan_index */
138 u8 fan_div[2]; /* Register encoding, shifted right */
139 s16 temp[t_num_temp]; /* Register values, normalized to 16 bit */
140 u16 alarms; /* Register encoding, combined */
141};
142
143static int lm80_read_value(struct i2c_client *client, u8 reg)
144{
145 return i2c_smbus_read_byte_data(client, reg);
146}
147
148static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value)
149{
150 return i2c_smbus_write_byte_data(client, reg, value);
151}
152
153/* Called when we have found a new LM80 and after read errors */
154static void lm80_init_client(struct i2c_client *client)
155{
156 /*
157 * Reset all except Watchdog values and last conversion values
158 * This sets fan-divs to 2, among others. This makes most other
159 * initializations unnecessary
160 */
161 lm80_write_value(client, LM80_REG_CONFIG, 0x80);
162 /* Set 11-bit temperature resolution */
163 lm80_write_value(client, LM80_REG_RES, 0x08);
164
165 /* Start monitoring */
166 lm80_write_value(client, LM80_REG_CONFIG, 0x01);
167}
168
169static struct lm80_data *lm80_update_device(struct device *dev)
170{
171 struct lm80_data *data = dev_get_drvdata(dev);
172 struct i2c_client *client = data->client;
173 int i;
174 int rv;
175 int prev_rv;
176 struct lm80_data *ret = data;
177
178 mutex_lock(&data->update_lock);
179
180 if (data->error)
181 lm80_init_client(client);
182
183 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
184 dev_dbg(dev, "Starting lm80 update\n");
185 for (i = 0; i <= 6; i++) {
186 rv = lm80_read_value(client, LM80_REG_IN(i));
187 if (rv < 0)
188 goto abort;
189 data->in[i_input][i] = rv;
190
191 rv = lm80_read_value(client, LM80_REG_IN_MIN(i));
192 if (rv < 0)
193 goto abort;
194 data->in[i_min][i] = rv;
195
196 rv = lm80_read_value(client, LM80_REG_IN_MAX(i));
197 if (rv < 0)
198 goto abort;
199 data->in[i_max][i] = rv;
200 }
201
202 rv = lm80_read_value(client, LM80_REG_FAN1);
203 if (rv < 0)
204 goto abort;
205 data->fan[f_input][0] = rv;
206
207 rv = lm80_read_value(client, LM80_REG_FAN_MIN(1));
208 if (rv < 0)
209 goto abort;
210 data->fan[f_min][0] = rv;
211
212 rv = lm80_read_value(client, LM80_REG_FAN2);
213 if (rv < 0)
214 goto abort;
215 data->fan[f_input][1] = rv;
216
217 rv = lm80_read_value(client, LM80_REG_FAN_MIN(2));
218 if (rv < 0)
219 goto abort;
220 data->fan[f_min][1] = rv;
221
222 prev_rv = rv = lm80_read_value(client, LM80_REG_TEMP);
223 if (rv < 0)
224 goto abort;
225 rv = lm80_read_value(client, LM80_REG_RES);
226 if (rv < 0)
227 goto abort;
228 data->temp[t_input] = (prev_rv << 8) | (rv & 0xf0);
229
230 for (i = t_input + 1; i < t_num_temp; i++) {
231 rv = lm80_read_value(client, temp_regs[i]);
232 if (rv < 0)
233 goto abort;
234 data->temp[i] = rv << 8;
235 }
236
237 rv = lm80_read_value(client, LM80_REG_FANDIV);
238 if (rv < 0)
239 goto abort;
240 data->fan_div[0] = (rv >> 2) & 0x03;
241 data->fan_div[1] = (rv >> 4) & 0x03;
242
243 prev_rv = rv = lm80_read_value(client, LM80_REG_ALARM1);
244 if (rv < 0)
245 goto abort;
246 rv = lm80_read_value(client, LM80_REG_ALARM2);
247 if (rv < 0)
248 goto abort;
249 data->alarms = prev_rv + (rv << 8);
250
251 data->last_updated = jiffies;
252 data->valid = 1;
253 data->error = 0;
254 }
255 goto done;
256
257abort:
258 ret = ERR_PTR(rv);
259 data->valid = 0;
260 data->error = 1;
261
262done:
263 mutex_unlock(&data->update_lock);
264
265 return ret;
266}
267
268/*
269 * Sysfs stuff
270 */
271
272static ssize_t show_in(struct device *dev, struct device_attribute *attr,
273 char *buf)
274{
275 struct lm80_data *data = lm80_update_device(dev);
276 int index = to_sensor_dev_attr_2(attr)->index;
277 int nr = to_sensor_dev_attr_2(attr)->nr;
278
279 if (IS_ERR(data))
280 return PTR_ERR(data);
281 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr][index]));
282}
283
284static ssize_t set_in(struct device *dev, struct device_attribute *attr,
285 const char *buf, size_t count)
286{
287 struct lm80_data *data = dev_get_drvdata(dev);
288 struct i2c_client *client = data->client;
289 int index = to_sensor_dev_attr_2(attr)->index;
290 int nr = to_sensor_dev_attr_2(attr)->nr;
291 long val;
292 u8 reg;
293 int err = kstrtol(buf, 10, &val);
294 if (err < 0)
295 return err;
296
297 reg = nr == i_min ? LM80_REG_IN_MIN(index) : LM80_REG_IN_MAX(index);
298
299 mutex_lock(&data->update_lock);
300 data->in[nr][index] = IN_TO_REG(val);
301 lm80_write_value(client, reg, data->in[nr][index]);
302 mutex_unlock(&data->update_lock);
303 return count;
304}
305
306static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
307 char *buf)
308{
309 int index = to_sensor_dev_attr_2(attr)->index;
310 int nr = to_sensor_dev_attr_2(attr)->nr;
311 struct lm80_data *data = lm80_update_device(dev);
312 if (IS_ERR(data))
313 return PTR_ERR(data);
314 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr][index],
315 DIV_FROM_REG(data->fan_div[index])));
316}
317
318static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
319 char *buf)
320{
321 int nr = to_sensor_dev_attr(attr)->index;
322 struct lm80_data *data = lm80_update_device(dev);
323 if (IS_ERR(data))
324 return PTR_ERR(data);
325 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
326}
327
328static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
329 const char *buf, size_t count)
330{
331 int index = to_sensor_dev_attr_2(attr)->index;
332 int nr = to_sensor_dev_attr_2(attr)->nr;
333 struct lm80_data *data = dev_get_drvdata(dev);
334 struct i2c_client *client = data->client;
335 unsigned long val;
336 int err = kstrtoul(buf, 10, &val);
337 if (err < 0)
338 return err;
339
340 mutex_lock(&data->update_lock);
341 data->fan[nr][index] = FAN_TO_REG(val,
342 DIV_FROM_REG(data->fan_div[index]));
343 lm80_write_value(client, LM80_REG_FAN_MIN(index + 1),
344 data->fan[nr][index]);
345 mutex_unlock(&data->update_lock);
346 return count;
347}
348
349/*
350 * Note: we save and restore the fan minimum here, because its value is
351 * determined in part by the fan divisor. This follows the principle of
352 * least surprise; the user doesn't expect the fan minimum to change just
353 * because the divisor changed.
354 */
355static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
356 const char *buf, size_t count)
357{
358 int nr = to_sensor_dev_attr(attr)->index;
359 struct lm80_data *data = dev_get_drvdata(dev);
360 struct i2c_client *client = data->client;
361 unsigned long min, val;
362 u8 reg;
363 int err = kstrtoul(buf, 10, &val);
364 if (err < 0)
365 return err;
366
367 /* Save fan_min */
368 mutex_lock(&data->update_lock);
369 min = FAN_FROM_REG(data->fan[f_min][nr],
370 DIV_FROM_REG(data->fan_div[nr]));
371
372 switch (val) {
373 case 1:
374 data->fan_div[nr] = 0;
375 break;
376 case 2:
377 data->fan_div[nr] = 1;
378 break;
379 case 4:
380 data->fan_div[nr] = 2;
381 break;
382 case 8:
383 data->fan_div[nr] = 3;
384 break;
385 default:
386 dev_err(dev,
387 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
388 val);
389 mutex_unlock(&data->update_lock);
390 return -EINVAL;
391 }
392
393 reg = (lm80_read_value(client, LM80_REG_FANDIV) &
394 ~(3 << (2 * (nr + 1)))) | (data->fan_div[nr] << (2 * (nr + 1)));
395 lm80_write_value(client, LM80_REG_FANDIV, reg);
396
397 /* Restore fan_min */
398 data->fan[f_min][nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
399 lm80_write_value(client, LM80_REG_FAN_MIN(nr + 1),
400 data->fan[f_min][nr]);
401 mutex_unlock(&data->update_lock);
402
403 return count;
404}
405
406static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
407 char *buf)
408{
409 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
410 struct lm80_data *data = lm80_update_device(dev);
411 if (IS_ERR(data))
412 return PTR_ERR(data);
413 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
414}
415
416static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
417 const char *buf, size_t count)
418{
419 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
420 struct lm80_data *data = dev_get_drvdata(dev);
421 struct i2c_client *client = data->client;
422 int nr = attr->index;
423 long val;
424 int err = kstrtol(buf, 10, &val);
425 if (err < 0)
426 return err;
427
428 mutex_lock(&data->update_lock);
429 data->temp[nr] = TEMP_TO_REG(val);
430 lm80_write_value(client, temp_regs[nr], data->temp[nr] >> 8);
431 mutex_unlock(&data->update_lock);
432 return count;
433}
434
435static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
436 char *buf)
437{
438 struct lm80_data *data = lm80_update_device(dev);
439 if (IS_ERR(data))
440 return PTR_ERR(data);
441 return sprintf(buf, "%u\n", data->alarms);
442}
443
444static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
445 char *buf)
446{
447 int bitnr = to_sensor_dev_attr(attr)->index;
448 struct lm80_data *data = lm80_update_device(dev);
449 if (IS_ERR(data))
450 return PTR_ERR(data);
451 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
452}
453
454static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO,
455 show_in, set_in, i_min, 0);
456static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO,
457 show_in, set_in, i_min, 1);
458static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO,
459 show_in, set_in, i_min, 2);
460static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO,
461 show_in, set_in, i_min, 3);
462static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO,
463 show_in, set_in, i_min, 4);
464static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO,
465 show_in, set_in, i_min, 5);
466static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO,
467 show_in, set_in, i_min, 6);
468static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO,
469 show_in, set_in, i_max, 0);
470static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO,
471 show_in, set_in, i_max, 1);
472static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO,
473 show_in, set_in, i_max, 2);
474static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO,
475 show_in, set_in, i_max, 3);
476static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO,
477 show_in, set_in, i_max, 4);
478static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO,
479 show_in, set_in, i_max, 5);
480static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO,
481 show_in, set_in, i_max, 6);
482static SENSOR_DEVICE_ATTR_2(in0_input, S_IRUGO, show_in, NULL, i_input, 0);
483static SENSOR_DEVICE_ATTR_2(in1_input, S_IRUGO, show_in, NULL, i_input, 1);
484static SENSOR_DEVICE_ATTR_2(in2_input, S_IRUGO, show_in, NULL, i_input, 2);
485static SENSOR_DEVICE_ATTR_2(in3_input, S_IRUGO, show_in, NULL, i_input, 3);
486static SENSOR_DEVICE_ATTR_2(in4_input, S_IRUGO, show_in, NULL, i_input, 4);
487static SENSOR_DEVICE_ATTR_2(in5_input, S_IRUGO, show_in, NULL, i_input, 5);
488static SENSOR_DEVICE_ATTR_2(in6_input, S_IRUGO, show_in, NULL, i_input, 6);
489static SENSOR_DEVICE_ATTR_2(fan1_min, S_IWUSR | S_IRUGO,
490 show_fan, set_fan_min, f_min, 0);
491static SENSOR_DEVICE_ATTR_2(fan2_min, S_IWUSR | S_IRUGO,
492 show_fan, set_fan_min, f_min, 1);
493static SENSOR_DEVICE_ATTR_2(fan1_input, S_IRUGO, show_fan, NULL, f_input, 0);
494static SENSOR_DEVICE_ATTR_2(fan2_input, S_IRUGO, show_fan, NULL, f_input, 1);
495static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR | S_IRUGO,
496 show_fan_div, set_fan_div, 0);
497static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR | S_IRUGO,
498 show_fan_div, set_fan_div, 1);
499static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, t_input);
500static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
501 set_temp, t_hot_max);
502static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp,
503 set_temp, t_hot_hyst);
504static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
505 set_temp, t_os_max);
506static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp,
507 set_temp, t_os_hyst);
508static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
509static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
510static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
511static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
512static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
513static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 4);
514static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 5);
515static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
516static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 10);
517static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 11);
518static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 8);
519static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
520
521/*
522 * Real code
523 */
524
525static struct attribute *lm80_attrs[] = {
526 &sensor_dev_attr_in0_min.dev_attr.attr,
527 &sensor_dev_attr_in1_min.dev_attr.attr,
528 &sensor_dev_attr_in2_min.dev_attr.attr,
529 &sensor_dev_attr_in3_min.dev_attr.attr,
530 &sensor_dev_attr_in4_min.dev_attr.attr,
531 &sensor_dev_attr_in5_min.dev_attr.attr,
532 &sensor_dev_attr_in6_min.dev_attr.attr,
533 &sensor_dev_attr_in0_max.dev_attr.attr,
534 &sensor_dev_attr_in1_max.dev_attr.attr,
535 &sensor_dev_attr_in2_max.dev_attr.attr,
536 &sensor_dev_attr_in3_max.dev_attr.attr,
537 &sensor_dev_attr_in4_max.dev_attr.attr,
538 &sensor_dev_attr_in5_max.dev_attr.attr,
539 &sensor_dev_attr_in6_max.dev_attr.attr,
540 &sensor_dev_attr_in0_input.dev_attr.attr,
541 &sensor_dev_attr_in1_input.dev_attr.attr,
542 &sensor_dev_attr_in2_input.dev_attr.attr,
543 &sensor_dev_attr_in3_input.dev_attr.attr,
544 &sensor_dev_attr_in4_input.dev_attr.attr,
545 &sensor_dev_attr_in5_input.dev_attr.attr,
546 &sensor_dev_attr_in6_input.dev_attr.attr,
547 &sensor_dev_attr_fan1_min.dev_attr.attr,
548 &sensor_dev_attr_fan2_min.dev_attr.attr,
549 &sensor_dev_attr_fan1_input.dev_attr.attr,
550 &sensor_dev_attr_fan2_input.dev_attr.attr,
551 &sensor_dev_attr_fan1_div.dev_attr.attr,
552 &sensor_dev_attr_fan2_div.dev_attr.attr,
553 &sensor_dev_attr_temp1_input.dev_attr.attr,
554 &sensor_dev_attr_temp1_max.dev_attr.attr,
555 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
556 &sensor_dev_attr_temp1_crit.dev_attr.attr,
557 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
558 &dev_attr_alarms.attr,
559 &sensor_dev_attr_in0_alarm.dev_attr.attr,
560 &sensor_dev_attr_in1_alarm.dev_attr.attr,
561 &sensor_dev_attr_in2_alarm.dev_attr.attr,
562 &sensor_dev_attr_in3_alarm.dev_attr.attr,
563 &sensor_dev_attr_in4_alarm.dev_attr.attr,
564 &sensor_dev_attr_in5_alarm.dev_attr.attr,
565 &sensor_dev_attr_in6_alarm.dev_attr.attr,
566 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
567 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
568 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
569 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
570 NULL
571};
572ATTRIBUTE_GROUPS(lm80);
573
574/* Return 0 if detection is successful, -ENODEV otherwise */
575static int lm80_detect(struct i2c_client *client, struct i2c_board_info *info)
576{
577 struct i2c_adapter *adapter = client->adapter;
578 int i, cur, man_id, dev_id;
579 const char *name = NULL;
580
581 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
582 return -ENODEV;
583
584 /* First check for unused bits, common to both chip types */
585 if ((lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
586 || (lm80_read_value(client, LM80_REG_CONFIG) & 0x80))
587 return -ENODEV;
588
589 /*
590 * The LM96080 has manufacturer and stepping/die rev registers so we
591 * can just check that. The LM80 does not have such registers so we
592 * have to use a more expensive trick.
593 */
594 man_id = lm80_read_value(client, LM96080_REG_MAN_ID);
595 dev_id = lm80_read_value(client, LM96080_REG_DEV_ID);
596 if (man_id == 0x01 && dev_id == 0x08) {
597 /* Check more unused bits for confirmation */
598 if (lm80_read_value(client, LM96080_REG_CONV_RATE) & 0xfe)
599 return -ENODEV;
600
601 name = "lm96080";
602 } else {
603 /* Check 6-bit addressing */
604 for (i = 0x2a; i <= 0x3d; i++) {
605 cur = i2c_smbus_read_byte_data(client, i);
606 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
607 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
608 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
609 return -ENODEV;
610 }
611
612 name = "lm80";
613 }
614
615 strlcpy(info->type, name, I2C_NAME_SIZE);
616
617 return 0;
618}
619
620static int lm80_probe(struct i2c_client *client,
621 const struct i2c_device_id *id)
622{
623 struct device *dev = &client->dev;
624 struct device *hwmon_dev;
625 struct lm80_data *data;
626
627 data = devm_kzalloc(dev, sizeof(struct lm80_data), GFP_KERNEL);
628 if (!data)
629 return -ENOMEM;
630
631 data->client = client;
632 mutex_init(&data->update_lock);
633
634 /* Initialize the LM80 chip */
635 lm80_init_client(client);
636
637 /* A few vars need to be filled upon startup */
638 data->fan[f_min][0] = lm80_read_value(client, LM80_REG_FAN_MIN(1));
639 data->fan[f_min][1] = lm80_read_value(client, LM80_REG_FAN_MIN(2));
640
641 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
642 data, lm80_groups);
643
644 return PTR_ERR_OR_ZERO(hwmon_dev);
645}
646
647/*
648 * Driver data (common to all clients)
649 */
650
651static const struct i2c_device_id lm80_id[] = {
652 { "lm80", 0 },
653 { "lm96080", 1 },
654 { }
655};
656MODULE_DEVICE_TABLE(i2c, lm80_id);
657
658static struct i2c_driver lm80_driver = {
659 .class = I2C_CLASS_HWMON,
660 .driver = {
661 .name = "lm80",
662 },
663 .probe = lm80_probe,
664 .id_table = lm80_id,
665 .detect = lm80_detect,
666 .address_list = normal_i2c,
667};
668
669module_i2c_driver(lm80_driver);
670
671MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
672 "Philip Edelbrock <phil@netroedge.com>");
673MODULE_DESCRIPTION("LM80 driver");
674MODULE_LICENSE("GPL");