2 * lm80.c - From lm_sensors, Linux kernel modules for hardware
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) (clamp_val(((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
)
82 rpm
= clamp_val(rpm
, 1, 1000000);
83 return clamp_val((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
)
95 res
= 625 * (long) temp
;
97 res
= ((long) temp
- 0x01000) * 625;
102 #define TEMP_LIMIT_FROM_REG(val) (((val) > 0x80 ? \
103 (val) - 0x100 : (val)) * 1000)
105 #define TEMP_LIMIT_TO_REG(val) clamp_val((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)
115 struct i2c_client
*client
;
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 struct lm80_data
*lm80_update_device(struct device
*dev
);
144 static int lm80_read_value(struct i2c_client
*client
, u8 reg
);
145 static int lm80_write_value(struct i2c_client
*client
, u8 reg
, u8 value
);
148 * Driver data (common to all clients)
151 static const struct i2c_device_id lm80_id
[] = {
156 MODULE_DEVICE_TABLE(i2c
, lm80_id
);
158 static struct i2c_driver lm80_driver
= {
159 .class = I2C_CLASS_HWMON
,
165 .detect
= lm80_detect
,
166 .address_list
= normal_i2c
,
173 #define show_in(suffix, value) \
174 static ssize_t show_in_##suffix(struct device *dev, \
175 struct device_attribute *attr, char *buf) \
177 int nr = to_sensor_dev_attr(attr)->index; \
178 struct lm80_data *data = lm80_update_device(dev); \
180 return PTR_ERR(data); \
181 return sprintf(buf, "%d\n", IN_FROM_REG(data->value[nr])); \
187 #define set_in(suffix, value, reg) \
188 static ssize_t set_in_##suffix(struct device *dev, \
189 struct device_attribute *attr, const char *buf, size_t count) \
191 int nr = to_sensor_dev_attr(attr)->index; \
192 struct lm80_data *data = dev_get_drvdata(dev); \
193 struct i2c_client *client = data->client; \
195 int err = kstrtol(buf, 10, &val); \
199 mutex_lock(&data->update_lock);\
200 data->value[nr] = IN_TO_REG(val); \
201 lm80_write_value(client, reg(nr), data->value[nr]); \
202 mutex_unlock(&data->update_lock);\
205 set_in(min
, in_min
, LM80_REG_IN_MIN
)
206 set_in(max
, in_max
, LM80_REG_IN_MAX
)
208 #define show_fan(suffix, value) \
209 static ssize_t show_fan_##suffix(struct device *dev, \
210 struct device_attribute *attr, char *buf) \
212 int nr = to_sensor_dev_attr(attr)->index; \
213 struct lm80_data *data = lm80_update_device(dev); \
215 return PTR_ERR(data); \
216 return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[nr], \
217 DIV_FROM_REG(data->fan_div[nr]))); \
219 show_fan(min
, fan_min
)
222 static ssize_t
show_fan_div(struct device
*dev
, struct device_attribute
*attr
,
225 int nr
= to_sensor_dev_attr(attr
)->index
;
226 struct lm80_data
*data
= lm80_update_device(dev
);
228 return PTR_ERR(data
);
229 return sprintf(buf
, "%d\n", DIV_FROM_REG(data
->fan_div
[nr
]));
232 static ssize_t
set_fan_min(struct device
*dev
, struct device_attribute
*attr
,
233 const char *buf
, size_t count
)
235 int nr
= to_sensor_dev_attr(attr
)->index
;
236 struct lm80_data
*data
= dev_get_drvdata(dev
);
237 struct i2c_client
*client
= data
->client
;
239 int err
= kstrtoul(buf
, 10, &val
);
243 mutex_lock(&data
->update_lock
);
244 data
->fan_min
[nr
] = FAN_TO_REG(val
, DIV_FROM_REG(data
->fan_div
[nr
]));
245 lm80_write_value(client
, LM80_REG_FAN_MIN(nr
+ 1), data
->fan_min
[nr
]);
246 mutex_unlock(&data
->update_lock
);
251 * Note: we save and restore the fan minimum here, because its value is
252 * determined in part by the fan divisor. This follows the principle of
253 * least surprise; the user doesn't expect the fan minimum to change just
254 * because the divisor changed.
256 static ssize_t
set_fan_div(struct device
*dev
, struct device_attribute
*attr
,
257 const char *buf
, size_t count
)
259 int nr
= to_sensor_dev_attr(attr
)->index
;
260 struct lm80_data
*data
= dev_get_drvdata(dev
);
261 struct i2c_client
*client
= data
->client
;
262 unsigned long min
, val
;
264 int err
= kstrtoul(buf
, 10, &val
);
269 mutex_lock(&data
->update_lock
);
270 min
= FAN_FROM_REG(data
->fan_min
[nr
],
271 DIV_FROM_REG(data
->fan_div
[nr
]));
275 data
->fan_div
[nr
] = 0;
278 data
->fan_div
[nr
] = 1;
281 data
->fan_div
[nr
] = 2;
284 data
->fan_div
[nr
] = 3;
288 "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n",
290 mutex_unlock(&data
->update_lock
);
294 reg
= (lm80_read_value(client
, LM80_REG_FANDIV
) & ~(3 << (2 * (nr
+ 1))))
295 | (data
->fan_div
[nr
] << (2 * (nr
+ 1)));
296 lm80_write_value(client
, LM80_REG_FANDIV
, reg
);
298 /* Restore fan_min */
299 data
->fan_min
[nr
] = FAN_TO_REG(min
, DIV_FROM_REG(data
->fan_div
[nr
]));
300 lm80_write_value(client
, LM80_REG_FAN_MIN(nr
+ 1), data
->fan_min
[nr
]);
301 mutex_unlock(&data
->update_lock
);
306 static ssize_t
show_temp_input1(struct device
*dev
,
307 struct device_attribute
*attr
, char *buf
)
309 struct lm80_data
*data
= lm80_update_device(dev
);
311 return PTR_ERR(data
);
312 return sprintf(buf
, "%ld\n", TEMP_FROM_REG(data
->temp
));
315 #define show_temp(suffix, value) \
316 static ssize_t show_temp_##suffix(struct device *dev, \
317 struct device_attribute *attr, char *buf) \
319 struct lm80_data *data = lm80_update_device(dev); \
321 return PTR_ERR(data); \
322 return sprintf(buf, "%d\n", TEMP_LIMIT_FROM_REG(data->value)); \
324 show_temp(hot_max
, temp_hot_max
);
325 show_temp(hot_hyst
, temp_hot_hyst
);
326 show_temp(os_max
, temp_os_max
);
327 show_temp(os_hyst
, temp_os_hyst
);
329 #define set_temp(suffix, value, reg) \
330 static ssize_t set_temp_##suffix(struct device *dev, \
331 struct device_attribute *attr, const char *buf, size_t count) \
333 struct lm80_data *data = dev_get_drvdata(dev); \
334 struct i2c_client *client = data->client; \
336 int err = kstrtol(buf, 10, &val); \
340 mutex_lock(&data->update_lock); \
341 data->value = TEMP_LIMIT_TO_REG(val); \
342 lm80_write_value(client, reg, data->value); \
343 mutex_unlock(&data->update_lock); \
346 set_temp(hot_max
, temp_hot_max
, LM80_REG_TEMP_HOT_MAX
);
347 set_temp(hot_hyst
, temp_hot_hyst
, LM80_REG_TEMP_HOT_HYST
);
348 set_temp(os_max
, temp_os_max
, LM80_REG_TEMP_OS_MAX
);
349 set_temp(os_hyst
, temp_os_hyst
, LM80_REG_TEMP_OS_HYST
);
351 static ssize_t
show_alarms(struct device
*dev
, struct device_attribute
*attr
,
354 struct lm80_data
*data
= lm80_update_device(dev
);
356 return PTR_ERR(data
);
357 return sprintf(buf
, "%u\n", data
->alarms
);
360 static ssize_t
show_alarm(struct device
*dev
, struct device_attribute
*attr
,
363 int bitnr
= to_sensor_dev_attr(attr
)->index
;
364 struct lm80_data
*data
= lm80_update_device(dev
);
366 return PTR_ERR(data
);
367 return sprintf(buf
, "%u\n", (data
->alarms
>> bitnr
) & 1);
370 static SENSOR_DEVICE_ATTR(in0_min
, S_IWUSR
| S_IRUGO
,
371 show_in_min
, set_in_min
, 0);
372 static SENSOR_DEVICE_ATTR(in1_min
, S_IWUSR
| S_IRUGO
,
373 show_in_min
, set_in_min
, 1);
374 static SENSOR_DEVICE_ATTR(in2_min
, S_IWUSR
| S_IRUGO
,
375 show_in_min
, set_in_min
, 2);
376 static SENSOR_DEVICE_ATTR(in3_min
, S_IWUSR
| S_IRUGO
,
377 show_in_min
, set_in_min
, 3);
378 static SENSOR_DEVICE_ATTR(in4_min
, S_IWUSR
| S_IRUGO
,
379 show_in_min
, set_in_min
, 4);
380 static SENSOR_DEVICE_ATTR(in5_min
, S_IWUSR
| S_IRUGO
,
381 show_in_min
, set_in_min
, 5);
382 static SENSOR_DEVICE_ATTR(in6_min
, S_IWUSR
| S_IRUGO
,
383 show_in_min
, set_in_min
, 6);
384 static SENSOR_DEVICE_ATTR(in0_max
, S_IWUSR
| S_IRUGO
,
385 show_in_max
, set_in_max
, 0);
386 static SENSOR_DEVICE_ATTR(in1_max
, S_IWUSR
| S_IRUGO
,
387 show_in_max
, set_in_max
, 1);
388 static SENSOR_DEVICE_ATTR(in2_max
, S_IWUSR
| S_IRUGO
,
389 show_in_max
, set_in_max
, 2);
390 static SENSOR_DEVICE_ATTR(in3_max
, S_IWUSR
| S_IRUGO
,
391 show_in_max
, set_in_max
, 3);
392 static SENSOR_DEVICE_ATTR(in4_max
, S_IWUSR
| S_IRUGO
,
393 show_in_max
, set_in_max
, 4);
394 static SENSOR_DEVICE_ATTR(in5_max
, S_IWUSR
| S_IRUGO
,
395 show_in_max
, set_in_max
, 5);
396 static SENSOR_DEVICE_ATTR(in6_max
, S_IWUSR
| S_IRUGO
,
397 show_in_max
, set_in_max
, 6);
398 static SENSOR_DEVICE_ATTR(in0_input
, S_IRUGO
, show_in_input
, NULL
, 0);
399 static SENSOR_DEVICE_ATTR(in1_input
, S_IRUGO
, show_in_input
, NULL
, 1);
400 static SENSOR_DEVICE_ATTR(in2_input
, S_IRUGO
, show_in_input
, NULL
, 2);
401 static SENSOR_DEVICE_ATTR(in3_input
, S_IRUGO
, show_in_input
, NULL
, 3);
402 static SENSOR_DEVICE_ATTR(in4_input
, S_IRUGO
, show_in_input
, NULL
, 4);
403 static SENSOR_DEVICE_ATTR(in5_input
, S_IRUGO
, show_in_input
, NULL
, 5);
404 static SENSOR_DEVICE_ATTR(in6_input
, S_IRUGO
, show_in_input
, NULL
, 6);
405 static SENSOR_DEVICE_ATTR(fan1_min
, S_IWUSR
| S_IRUGO
,
406 show_fan_min
, set_fan_min
, 0);
407 static SENSOR_DEVICE_ATTR(fan2_min
, S_IWUSR
| S_IRUGO
,
408 show_fan_min
, set_fan_min
, 1);
409 static SENSOR_DEVICE_ATTR(fan1_input
, S_IRUGO
, show_fan_input
, NULL
, 0);
410 static SENSOR_DEVICE_ATTR(fan2_input
, S_IRUGO
, show_fan_input
, NULL
, 1);
411 static SENSOR_DEVICE_ATTR(fan1_div
, S_IWUSR
| S_IRUGO
,
412 show_fan_div
, set_fan_div
, 0);
413 static SENSOR_DEVICE_ATTR(fan2_div
, S_IWUSR
| S_IRUGO
,
414 show_fan_div
, set_fan_div
, 1);
415 static DEVICE_ATTR(temp1_input
, S_IRUGO
, show_temp_input1
, NULL
);
416 static DEVICE_ATTR(temp1_max
, S_IWUSR
| S_IRUGO
, show_temp_hot_max
,
418 static DEVICE_ATTR(temp1_max_hyst
, S_IWUSR
| S_IRUGO
, show_temp_hot_hyst
,
420 static DEVICE_ATTR(temp1_crit
, S_IWUSR
| S_IRUGO
, show_temp_os_max
,
422 static DEVICE_ATTR(temp1_crit_hyst
, S_IWUSR
| S_IRUGO
, show_temp_os_hyst
,
424 static DEVICE_ATTR(alarms
, S_IRUGO
, show_alarms
, NULL
);
425 static SENSOR_DEVICE_ATTR(in0_alarm
, S_IRUGO
, show_alarm
, NULL
, 0);
426 static SENSOR_DEVICE_ATTR(in1_alarm
, S_IRUGO
, show_alarm
, NULL
, 1);
427 static SENSOR_DEVICE_ATTR(in2_alarm
, S_IRUGO
, show_alarm
, NULL
, 2);
428 static SENSOR_DEVICE_ATTR(in3_alarm
, S_IRUGO
, show_alarm
, NULL
, 3);
429 static SENSOR_DEVICE_ATTR(in4_alarm
, S_IRUGO
, show_alarm
, NULL
, 4);
430 static SENSOR_DEVICE_ATTR(in5_alarm
, S_IRUGO
, show_alarm
, NULL
, 5);
431 static SENSOR_DEVICE_ATTR(in6_alarm
, S_IRUGO
, show_alarm
, NULL
, 6);
432 static SENSOR_DEVICE_ATTR(fan1_alarm
, S_IRUGO
, show_alarm
, NULL
, 10);
433 static SENSOR_DEVICE_ATTR(fan2_alarm
, S_IRUGO
, show_alarm
, NULL
, 11);
434 static SENSOR_DEVICE_ATTR(temp1_max_alarm
, S_IRUGO
, show_alarm
, NULL
, 8);
435 static SENSOR_DEVICE_ATTR(temp1_crit_alarm
, S_IRUGO
, show_alarm
, NULL
, 13);
441 static struct attribute
*lm80_attrs
[] = {
442 &sensor_dev_attr_in0_min
.dev_attr
.attr
,
443 &sensor_dev_attr_in1_min
.dev_attr
.attr
,
444 &sensor_dev_attr_in2_min
.dev_attr
.attr
,
445 &sensor_dev_attr_in3_min
.dev_attr
.attr
,
446 &sensor_dev_attr_in4_min
.dev_attr
.attr
,
447 &sensor_dev_attr_in5_min
.dev_attr
.attr
,
448 &sensor_dev_attr_in6_min
.dev_attr
.attr
,
449 &sensor_dev_attr_in0_max
.dev_attr
.attr
,
450 &sensor_dev_attr_in1_max
.dev_attr
.attr
,
451 &sensor_dev_attr_in2_max
.dev_attr
.attr
,
452 &sensor_dev_attr_in3_max
.dev_attr
.attr
,
453 &sensor_dev_attr_in4_max
.dev_attr
.attr
,
454 &sensor_dev_attr_in5_max
.dev_attr
.attr
,
455 &sensor_dev_attr_in6_max
.dev_attr
.attr
,
456 &sensor_dev_attr_in0_input
.dev_attr
.attr
,
457 &sensor_dev_attr_in1_input
.dev_attr
.attr
,
458 &sensor_dev_attr_in2_input
.dev_attr
.attr
,
459 &sensor_dev_attr_in3_input
.dev_attr
.attr
,
460 &sensor_dev_attr_in4_input
.dev_attr
.attr
,
461 &sensor_dev_attr_in5_input
.dev_attr
.attr
,
462 &sensor_dev_attr_in6_input
.dev_attr
.attr
,
463 &sensor_dev_attr_fan1_min
.dev_attr
.attr
,
464 &sensor_dev_attr_fan2_min
.dev_attr
.attr
,
465 &sensor_dev_attr_fan1_input
.dev_attr
.attr
,
466 &sensor_dev_attr_fan2_input
.dev_attr
.attr
,
467 &sensor_dev_attr_fan1_div
.dev_attr
.attr
,
468 &sensor_dev_attr_fan2_div
.dev_attr
.attr
,
469 &dev_attr_temp1_input
.attr
,
470 &dev_attr_temp1_max
.attr
,
471 &dev_attr_temp1_max_hyst
.attr
,
472 &dev_attr_temp1_crit
.attr
,
473 &dev_attr_temp1_crit_hyst
.attr
,
474 &dev_attr_alarms
.attr
,
475 &sensor_dev_attr_in0_alarm
.dev_attr
.attr
,
476 &sensor_dev_attr_in1_alarm
.dev_attr
.attr
,
477 &sensor_dev_attr_in2_alarm
.dev_attr
.attr
,
478 &sensor_dev_attr_in3_alarm
.dev_attr
.attr
,
479 &sensor_dev_attr_in4_alarm
.dev_attr
.attr
,
480 &sensor_dev_attr_in5_alarm
.dev_attr
.attr
,
481 &sensor_dev_attr_in6_alarm
.dev_attr
.attr
,
482 &sensor_dev_attr_fan1_alarm
.dev_attr
.attr
,
483 &sensor_dev_attr_fan2_alarm
.dev_attr
.attr
,
484 &sensor_dev_attr_temp1_max_alarm
.dev_attr
.attr
,
485 &sensor_dev_attr_temp1_crit_alarm
.dev_attr
.attr
,
488 ATTRIBUTE_GROUPS(lm80
);
490 /* Return 0 if detection is successful, -ENODEV otherwise */
491 static int lm80_detect(struct i2c_client
*client
, struct i2c_board_info
*info
)
493 struct i2c_adapter
*adapter
= client
->adapter
;
494 int i
, cur
, man_id
, dev_id
;
495 const char *name
= NULL
;
497 if (!i2c_check_functionality(adapter
, I2C_FUNC_SMBUS_BYTE_DATA
))
500 /* First check for unused bits, common to both chip types */
501 if ((lm80_read_value(client
, LM80_REG_ALARM2
) & 0xc0)
502 || (lm80_read_value(client
, LM80_REG_CONFIG
) & 0x80))
506 * The LM96080 has manufacturer and stepping/die rev registers so we
507 * can just check that. The LM80 does not have such registers so we
508 * have to use a more expensive trick.
510 man_id
= lm80_read_value(client
, LM96080_REG_MAN_ID
);
511 dev_id
= lm80_read_value(client
, LM96080_REG_DEV_ID
);
512 if (man_id
== 0x01 && dev_id
== 0x08) {
513 /* Check more unused bits for confirmation */
514 if (lm80_read_value(client
, LM96080_REG_CONV_RATE
) & 0xfe)
519 /* Check 6-bit addressing */
520 for (i
= 0x2a; i
<= 0x3d; i
++) {
521 cur
= i2c_smbus_read_byte_data(client
, i
);
522 if ((i2c_smbus_read_byte_data(client
, i
+ 0x40) != cur
)
523 || (i2c_smbus_read_byte_data(client
, i
+ 0x80) != cur
)
524 || (i2c_smbus_read_byte_data(client
, i
+ 0xc0) != cur
))
531 strlcpy(info
->type
, name
, I2C_NAME_SIZE
);
536 static int lm80_probe(struct i2c_client
*client
,
537 const struct i2c_device_id
*id
)
539 struct device
*dev
= &client
->dev
;
540 struct device
*hwmon_dev
;
541 struct lm80_data
*data
;
543 data
= devm_kzalloc(dev
, sizeof(struct lm80_data
), GFP_KERNEL
);
547 data
->client
= client
;
548 mutex_init(&data
->update_lock
);
550 /* Initialize the LM80 chip */
551 lm80_init_client(client
);
553 /* A few vars need to be filled upon startup */
554 data
->fan_min
[0] = lm80_read_value(client
, LM80_REG_FAN_MIN(1));
555 data
->fan_min
[1] = lm80_read_value(client
, LM80_REG_FAN_MIN(2));
557 hwmon_dev
= devm_hwmon_device_register_with_groups(dev
, client
->name
,
560 return PTR_ERR_OR_ZERO(hwmon_dev
);
563 static int lm80_read_value(struct i2c_client
*client
, u8 reg
)
565 return i2c_smbus_read_byte_data(client
, reg
);
568 static int lm80_write_value(struct i2c_client
*client
, u8 reg
, u8 value
)
570 return i2c_smbus_write_byte_data(client
, reg
, value
);
573 /* Called when we have found a new LM80. */
574 static void lm80_init_client(struct i2c_client
*client
)
577 * Reset all except Watchdog values and last conversion values
578 * This sets fan-divs to 2, among others. This makes most other
579 * initializations unnecessary
581 lm80_write_value(client
, LM80_REG_CONFIG
, 0x80);
582 /* Set 11-bit temperature resolution */
583 lm80_write_value(client
, LM80_REG_RES
, 0x08);
585 /* Start monitoring */
586 lm80_write_value(client
, LM80_REG_CONFIG
, 0x01);
589 static struct lm80_data
*lm80_update_device(struct device
*dev
)
591 struct lm80_data
*data
= dev_get_drvdata(dev
);
592 struct i2c_client
*client
= data
->client
;
596 struct lm80_data
*ret
= data
;
598 mutex_lock(&data
->update_lock
);
601 lm80_init_client(client
);
603 if (time_after(jiffies
, data
->last_updated
+ 2 * HZ
) || !data
->valid
) {
604 dev_dbg(dev
, "Starting lm80 update\n");
605 for (i
= 0; i
<= 6; i
++) {
606 rv
= lm80_read_value(client
, LM80_REG_IN(i
));
611 rv
= lm80_read_value(client
, LM80_REG_IN_MIN(i
));
614 data
->in_min
[i
] = rv
;
616 rv
= lm80_read_value(client
, LM80_REG_IN_MAX(i
));
619 data
->in_max
[i
] = rv
;
622 rv
= lm80_read_value(client
, LM80_REG_FAN1
);
627 rv
= lm80_read_value(client
, LM80_REG_FAN_MIN(1));
630 data
->fan_min
[0] = rv
;
632 rv
= lm80_read_value(client
, LM80_REG_FAN2
);
637 rv
= lm80_read_value(client
, LM80_REG_FAN_MIN(2));
640 data
->fan_min
[1] = rv
;
642 prev_rv
= rv
= lm80_read_value(client
, LM80_REG_TEMP
);
645 rv
= lm80_read_value(client
, LM80_REG_RES
);
648 data
->temp
= (prev_rv
<< 8) | (rv
& 0xf0);
650 rv
= lm80_read_value(client
, LM80_REG_TEMP_OS_MAX
);
653 data
->temp_os_max
= rv
;
655 rv
= lm80_read_value(client
, LM80_REG_TEMP_OS_HYST
);
658 data
->temp_os_hyst
= rv
;
660 rv
= lm80_read_value(client
, LM80_REG_TEMP_HOT_MAX
);
663 data
->temp_hot_max
= rv
;
665 rv
= lm80_read_value(client
, LM80_REG_TEMP_HOT_HYST
);
668 data
->temp_hot_hyst
= rv
;
670 rv
= lm80_read_value(client
, LM80_REG_FANDIV
);
673 data
->fan_div
[0] = (rv
>> 2) & 0x03;
674 data
->fan_div
[1] = (rv
>> 4) & 0x03;
676 prev_rv
= rv
= lm80_read_value(client
, LM80_REG_ALARM1
);
679 rv
= lm80_read_value(client
, LM80_REG_ALARM2
);
682 data
->alarms
= prev_rv
+ (rv
<< 8);
684 data
->last_updated
= jiffies
;
696 mutex_unlock(&data
->update_lock
);
701 module_i2c_driver(lm80_driver
);
703 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
704 "Philip Edelbrock <phil@netroedge.com>");
705 MODULE_DESCRIPTION("LM80 driver");
706 MODULE_LICENSE("GPL");