2 it87.c - Part of lm_sensors, Linux kernel modules for hardware
5 Supports: IT8705F Super I/O chip w/LPC interface
6 IT8712F Super I/O chip w/LPC interface
7 IT8716F Super I/O chip w/LPC interface
8 IT8718F Super I/O chip w/LPC interface
9 IT8726F Super I/O chip w/LPC interface
10 Sis950 A clone of the IT8705F
12 Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com>
13 Copyright (C) 2005-2006 Jean Delvare <khali@linux-fr.org>
15 This program is free software; you can redistribute it and/or modify
16 it under the terms of the GNU General Public License as published by
17 the Free Software Foundation; either version 2 of the License, or
18 (at your option) any later version.
20 This program is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
25 You should have received a copy of the GNU General Public License
26 along with this program; if not, write to the Free Software
27 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/jiffies.h>
34 #include <linux/i2c.h>
35 #include <linux/i2c-isa.h>
36 #include <linux/hwmon.h>
37 #include <linux/hwmon-sysfs.h>
38 #include <linux/hwmon-vid.h>
39 #include <linux/err.h>
40 #include <linux/mutex.h>
41 #include <linux/sysfs.h>
45 static unsigned short isa_address;
46 enum chips { it87, it8712, it8716, it8718 };
48 #define REG 0x2e /* The register to read/write */
49 #define DEV 0x07 /* Register: Logical device select */
50 #define VAL 0x2f /* The value to read/write */
51 #define PME 0x04 /* The device with the fan registers in it */
52 #define GPIO 0x07 /* The device with the IT8718F VID value in it */
53 #define DEVID 0x20 /* Register: Device ID */
54 #define DEVREV 0x22 /* Register: Device Revision */
63 static int superio_inw(int reg)
74 superio_select(int ldn)
96 /* Logical device 4 registers */
97 #define IT8712F_DEVID 0x8712
98 #define IT8705F_DEVID 0x8705
99 #define IT8716F_DEVID 0x8716
100 #define IT8718F_DEVID 0x8718
101 #define IT8726F_DEVID 0x8726
102 #define IT87_ACT_REG 0x30
103 #define IT87_BASE_REG 0x60
105 /* Logical device 7 registers (IT8712F and later) */
106 #define IT87_SIO_PINX2_REG 0x2c /* Pin selection */
107 #define IT87_SIO_VID_REG 0xfc /* VID value */
109 /* Update battery voltage after every reading if true */
110 static int update_vbat;
112 /* Not all BIOSes properly configure the PWM registers */
113 static int fix_pwm_polarity;
115 /* Values read from Super-I/O config space */
116 static u16 chip_type;
119 /* Many IT87 constants specified below */
121 /* Length of ISA address segment */
122 #define IT87_EXTENT 8
124 /* Where are the ISA address/data registers relative to the base address */
125 #define IT87_ADDR_REG_OFFSET 5
126 #define IT87_DATA_REG_OFFSET 6
128 /*----- The IT87 registers -----*/
130 #define IT87_REG_CONFIG 0x00
132 #define IT87_REG_ALARM1 0x01
133 #define IT87_REG_ALARM2 0x02
134 #define IT87_REG_ALARM3 0x03
136 /* The IT8718F has the VID value in a different register, in Super-I/O
137 configuration space. */
138 #define IT87_REG_VID 0x0a
139 /* Warning: register 0x0b is used for something completely different in
140 new chips/revisions. I suspect only 16-bit tachometer mode will work
142 #define IT87_REG_FAN_DIV 0x0b
143 #define IT87_REG_FAN_16BIT 0x0c
145 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
147 #define IT87_REG_FAN(nr) (0x0d + (nr))
148 #define IT87_REG_FAN_MIN(nr) (0x10 + (nr))
149 #define IT87_REG_FANX(nr) (0x18 + (nr))
150 #define IT87_REG_FANX_MIN(nr) (0x1b + (nr))
151 #define IT87_REG_FAN_MAIN_CTRL 0x13
152 #define IT87_REG_FAN_CTL 0x14
153 #define IT87_REG_PWM(nr) (0x15 + (nr))
155 #define IT87_REG_VIN(nr) (0x20 + (nr))
156 #define IT87_REG_TEMP(nr) (0x29 + (nr))
158 #define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2)
159 #define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2)
160 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
161 #define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2)
163 #define IT87_REG_VIN_ENABLE 0x50
164 #define IT87_REG_TEMP_ENABLE 0x51
166 #define IT87_REG_CHIPID 0x58
168 #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255))
169 #define IN_FROM_REG(val) ((val) * 16)
171 static inline u8 FAN_TO_REG(long rpm, int div)
175 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
176 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
180 static inline u16 FAN16_TO_REG(long rpm)
184 return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
187 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
188 /* The divider is fixed to 2 in 16-bit mode */
189 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
191 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
192 ((val)+500)/1000),-128,127))
193 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
195 #define PWM_TO_REG(val) ((val) >> 1)
196 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
198 static int DIV_TO_REG(int val)
201 while (answer < 7 && (val >>= 1))
205 #define DIV_FROM_REG(val) (1 << (val))
207 static const unsigned int pwm_freq[8] = {
219 /* For each registered chip, we need to keep some data in memory.
220 The structure is dynamically allocated. */
222 struct i2c_client client;
223 struct class_device *class_dev;
226 struct mutex update_lock;
227 char valid; /* !=0 if following fields are valid */
228 unsigned long last_updated; /* In jiffies */
230 u8 in[9]; /* Register value */
231 u8 in_max[8]; /* Register value */
232 u8 in_min[8]; /* Register value */
233 u8 has_fan; /* Bitfield, fans enabled */
234 u16 fan[3]; /* Register values, possibly combined */
235 u16 fan_min[3]; /* Register values, possibly combined */
236 u8 temp[3]; /* Register value */
237 u8 temp_high[3]; /* Register value */
238 u8 temp_low[3]; /* Register value */
239 u8 sensor; /* Register value */
240 u8 fan_div[3]; /* Register encoding, shifted right */
241 u8 vid; /* Register encoding, combined */
243 u32 alarms; /* Register encoding, combined */
244 u8 fan_main_ctrl; /* Register value */
245 u8 fan_ctl; /* Register value */
246 u8 manual_pwm_ctl[3]; /* manual PWM value set by user */
250 static int it87_detect(struct i2c_adapter *adapter);
251 static int it87_detach_client(struct i2c_client *client);
253 static int it87_read_value(struct i2c_client *client, u8 reg);
254 static void it87_write_value(struct i2c_client *client, u8 reg, u8 value);
255 static struct it87_data *it87_update_device(struct device *dev);
256 static int it87_check_pwm(struct i2c_client *client);
257 static void it87_init_client(struct i2c_client *client, struct it87_data *data);
260 static struct i2c_driver it87_isa_driver = {
262 .owner = THIS_MODULE,
265 .attach_adapter = it87_detect,
266 .detach_client = it87_detach_client,
270 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
273 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
274 int nr = sensor_attr->index;
276 struct it87_data *data = it87_update_device(dev);
277 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
280 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
283 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
284 int nr = sensor_attr->index;
286 struct it87_data *data = it87_update_device(dev);
287 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
290 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
293 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
294 int nr = sensor_attr->index;
296 struct it87_data *data = it87_update_device(dev);
297 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
300 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count)
303 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
304 int nr = sensor_attr->index;
306 struct i2c_client *client = to_i2c_client(dev);
307 struct it87_data *data = i2c_get_clientdata(client);
308 unsigned long val = simple_strtoul(buf, NULL, 10);
310 mutex_lock(&data->update_lock);
311 data->in_min[nr] = IN_TO_REG(val);
312 it87_write_value(client, IT87_REG_VIN_MIN(nr),
314 mutex_unlock(&data->update_lock);
317 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
318 const char *buf, size_t count)
320 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
321 int nr = sensor_attr->index;
323 struct i2c_client *client = to_i2c_client(dev);
324 struct it87_data *data = i2c_get_clientdata(client);
325 unsigned long val = simple_strtoul(buf, NULL, 10);
327 mutex_lock(&data->update_lock);
328 data->in_max[nr] = IN_TO_REG(val);
329 it87_write_value(client, IT87_REG_VIN_MAX(nr),
331 mutex_unlock(&data->update_lock);
335 #define show_in_offset(offset) \
336 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
337 show_in, NULL, offset);
339 #define limit_in_offset(offset) \
340 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
341 show_in_min, set_in_min, offset); \
342 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
343 show_in_max, set_in_max, offset);
364 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
367 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
368 int nr = sensor_attr->index;
370 struct it87_data *data = it87_update_device(dev);
371 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
373 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
376 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
377 int nr = sensor_attr->index;
379 struct it87_data *data = it87_update_device(dev);
380 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
382 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
385 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
386 int nr = sensor_attr->index;
388 struct it87_data *data = it87_update_device(dev);
389 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
391 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
392 const char *buf, size_t count)
394 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
395 int nr = sensor_attr->index;
397 struct i2c_client *client = to_i2c_client(dev);
398 struct it87_data *data = i2c_get_clientdata(client);
399 int val = simple_strtol(buf, NULL, 10);
401 mutex_lock(&data->update_lock);
402 data->temp_high[nr] = TEMP_TO_REG(val);
403 it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
404 mutex_unlock(&data->update_lock);
407 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
408 const char *buf, size_t count)
410 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
411 int nr = sensor_attr->index;
413 struct i2c_client *client = to_i2c_client(dev);
414 struct it87_data *data = i2c_get_clientdata(client);
415 int val = simple_strtol(buf, NULL, 10);
417 mutex_lock(&data->update_lock);
418 data->temp_low[nr] = TEMP_TO_REG(val);
419 it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
420 mutex_unlock(&data->update_lock);
423 #define show_temp_offset(offset) \
424 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
425 show_temp, NULL, offset - 1); \
426 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
427 show_temp_max, set_temp_max, offset - 1); \
428 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
429 show_temp_min, set_temp_min, offset - 1);
435 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
438 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
439 int nr = sensor_attr->index;
441 struct it87_data *data = it87_update_device(dev);
442 u8 reg = data->sensor; /* In case the value is updated while we use it */
445 return sprintf(buf, "3\n"); /* thermal diode */
447 return sprintf(buf, "2\n"); /* thermistor */
448 return sprintf(buf, "0\n"); /* disabled */
450 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
453 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
454 int nr = sensor_attr->index;
456 struct i2c_client *client = to_i2c_client(dev);
457 struct it87_data *data = i2c_get_clientdata(client);
458 int val = simple_strtol(buf, NULL, 10);
460 mutex_lock(&data->update_lock);
462 data->sensor &= ~(1 << nr);
463 data->sensor &= ~(8 << nr);
464 /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
466 data->sensor |= 1 << nr;
468 data->sensor |= 8 << nr;
470 mutex_unlock(&data->update_lock);
473 it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
474 mutex_unlock(&data->update_lock);
477 #define show_sensor_offset(offset) \
478 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR, \
479 show_sensor, set_sensor, offset - 1);
481 show_sensor_offset(1);
482 show_sensor_offset(2);
483 show_sensor_offset(3);
486 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
489 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
490 int nr = sensor_attr->index;
492 struct it87_data *data = it87_update_device(dev);
493 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
494 DIV_FROM_REG(data->fan_div[nr])));
496 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
499 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
500 int nr = sensor_attr->index;
502 struct it87_data *data = it87_update_device(dev);
503 return sprintf(buf,"%d\n",
504 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
506 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
509 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
510 int nr = sensor_attr->index;
512 struct it87_data *data = it87_update_device(dev);
513 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
515 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
518 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
519 int nr = sensor_attr->index;
521 struct it87_data *data = it87_update_device(dev);
522 return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
524 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
527 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
528 int nr = sensor_attr->index;
530 struct it87_data *data = it87_update_device(dev);
531 return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
533 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
536 struct it87_data *data = it87_update_device(dev);
537 int index = (data->fan_ctl >> 4) & 0x07;
539 return sprintf(buf, "%u\n", pwm_freq[index]);
541 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
542 const char *buf, size_t count)
544 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
545 int nr = sensor_attr->index;
547 struct i2c_client *client = to_i2c_client(dev);
548 struct it87_data *data = i2c_get_clientdata(client);
549 int val = simple_strtol(buf, NULL, 10);
552 mutex_lock(&data->update_lock);
553 reg = it87_read_value(client, IT87_REG_FAN_DIV);
555 case 0: data->fan_div[nr] = reg & 0x07; break;
556 case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
557 case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
560 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
561 it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
562 mutex_unlock(&data->update_lock);
565 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
566 const char *buf, size_t count)
568 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
569 int nr = sensor_attr->index;
571 struct i2c_client *client = to_i2c_client(dev);
572 struct it87_data *data = i2c_get_clientdata(client);
573 unsigned long val = simple_strtoul(buf, NULL, 10);
577 mutex_lock(&data->update_lock);
578 old = it87_read_value(client, IT87_REG_FAN_DIV);
580 /* Save fan min limit */
581 min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
586 data->fan_div[nr] = DIV_TO_REG(val);
590 data->fan_div[nr] = 1;
592 data->fan_div[nr] = 3;
595 val |= (data->fan_div[0] & 0x07);
596 val |= (data->fan_div[1] & 0x07) << 3;
597 if (data->fan_div[2] == 3)
599 it87_write_value(client, IT87_REG_FAN_DIV, val);
601 /* Restore fan min limit */
602 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
603 it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
605 mutex_unlock(&data->update_lock);
608 static ssize_t set_pwm_enable(struct device *dev,
609 struct device_attribute *attr, const char *buf, size_t count)
611 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
612 int nr = sensor_attr->index;
614 struct i2c_client *client = to_i2c_client(dev);
615 struct it87_data *data = i2c_get_clientdata(client);
616 int val = simple_strtol(buf, NULL, 10);
618 mutex_lock(&data->update_lock);
622 /* make sure the fan is on when in on/off mode */
623 tmp = it87_read_value(client, IT87_REG_FAN_CTL);
624 it87_write_value(client, IT87_REG_FAN_CTL, tmp | (1 << nr));
625 /* set on/off mode */
626 data->fan_main_ctrl &= ~(1 << nr);
627 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
628 } else if (val == 1) {
629 /* set SmartGuardian mode */
630 data->fan_main_ctrl |= (1 << nr);
631 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
632 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
633 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
635 mutex_unlock(&data->update_lock);
639 mutex_unlock(&data->update_lock);
642 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
643 const char *buf, size_t count)
645 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
646 int nr = sensor_attr->index;
648 struct i2c_client *client = to_i2c_client(dev);
649 struct it87_data *data = i2c_get_clientdata(client);
650 int val = simple_strtol(buf, NULL, 10);
652 if (val < 0 || val > 255)
655 mutex_lock(&data->update_lock);
656 data->manual_pwm_ctl[nr] = val;
657 if (data->fan_main_ctrl & (1 << nr))
658 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
659 mutex_unlock(&data->update_lock);
662 static ssize_t set_pwm_freq(struct device *dev,
663 struct device_attribute *attr, const char *buf, size_t count)
665 struct i2c_client *client = to_i2c_client(dev);
666 struct it87_data *data = i2c_get_clientdata(client);
667 unsigned long val = simple_strtoul(buf, NULL, 10);
670 /* Search for the nearest available frequency */
671 for (i = 0; i < 7; i++) {
672 if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
676 mutex_lock(&data->update_lock);
677 data->fan_ctl = it87_read_value(client, IT87_REG_FAN_CTL) & 0x8f;
678 data->fan_ctl |= i << 4;
679 it87_write_value(client, IT87_REG_FAN_CTL, data->fan_ctl);
680 mutex_unlock(&data->update_lock);
685 #define show_fan_offset(offset) \
686 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
687 show_fan, NULL, offset - 1); \
688 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
689 show_fan_min, set_fan_min, offset - 1); \
690 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
691 show_fan_div, set_fan_div, offset - 1);
697 #define show_pwm_offset(offset) \
698 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
699 show_pwm_enable, set_pwm_enable, offset - 1); \
700 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
701 show_pwm, set_pwm, offset - 1); \
702 static DEVICE_ATTR(pwm##offset##_freq, \
703 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO), \
704 show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
710 /* A different set of callbacks for 16-bit fans */
711 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
714 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
715 int nr = sensor_attr->index;
716 struct it87_data *data = it87_update_device(dev);
717 return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
720 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
723 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
724 int nr = sensor_attr->index;
725 struct it87_data *data = it87_update_device(dev);
726 return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
729 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
730 const char *buf, size_t count)
732 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
733 int nr = sensor_attr->index;
734 struct i2c_client *client = to_i2c_client(dev);
735 struct it87_data *data = i2c_get_clientdata(client);
736 int val = simple_strtol(buf, NULL, 10);
738 mutex_lock(&data->update_lock);
739 data->fan_min[nr] = FAN16_TO_REG(val);
740 it87_write_value(client, IT87_REG_FAN_MIN(nr),
741 data->fan_min[nr] & 0xff);
742 it87_write_value(client, IT87_REG_FANX_MIN(nr),
743 data->fan_min[nr] >> 8);
744 mutex_unlock(&data->update_lock);
748 /* We want to use the same sysfs file names as 8-bit fans, but we need
749 different variable names, so we have to use SENSOR_ATTR instead of
750 SENSOR_DEVICE_ATTR. */
751 #define show_fan16_offset(offset) \
752 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
753 = SENSOR_ATTR(fan##offset##_input, S_IRUGO, \
754 show_fan16, NULL, offset - 1); \
755 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
756 = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
757 show_fan16_min, set_fan16_min, offset - 1)
759 show_fan16_offset(1);
760 show_fan16_offset(2);
761 show_fan16_offset(3);
764 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
766 struct it87_data *data = it87_update_device(dev);
767 return sprintf(buf, "%u\n", data->alarms);
769 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
772 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
774 struct it87_data *data = it87_update_device(dev);
775 return sprintf(buf, "%u\n", data->vrm);
778 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
780 struct i2c_client *client = to_i2c_client(dev);
781 struct it87_data *data = i2c_get_clientdata(client);
784 val = simple_strtoul(buf, NULL, 10);
789 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
792 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
794 struct it87_data *data = it87_update_device(dev);
795 return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
797 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
799 static struct attribute *it87_attributes[] = {
800 &sensor_dev_attr_in0_input.dev_attr.attr,
801 &sensor_dev_attr_in1_input.dev_attr.attr,
802 &sensor_dev_attr_in2_input.dev_attr.attr,
803 &sensor_dev_attr_in3_input.dev_attr.attr,
804 &sensor_dev_attr_in4_input.dev_attr.attr,
805 &sensor_dev_attr_in5_input.dev_attr.attr,
806 &sensor_dev_attr_in6_input.dev_attr.attr,
807 &sensor_dev_attr_in7_input.dev_attr.attr,
808 &sensor_dev_attr_in8_input.dev_attr.attr,
809 &sensor_dev_attr_in0_min.dev_attr.attr,
810 &sensor_dev_attr_in1_min.dev_attr.attr,
811 &sensor_dev_attr_in2_min.dev_attr.attr,
812 &sensor_dev_attr_in3_min.dev_attr.attr,
813 &sensor_dev_attr_in4_min.dev_attr.attr,
814 &sensor_dev_attr_in5_min.dev_attr.attr,
815 &sensor_dev_attr_in6_min.dev_attr.attr,
816 &sensor_dev_attr_in7_min.dev_attr.attr,
817 &sensor_dev_attr_in0_max.dev_attr.attr,
818 &sensor_dev_attr_in1_max.dev_attr.attr,
819 &sensor_dev_attr_in2_max.dev_attr.attr,
820 &sensor_dev_attr_in3_max.dev_attr.attr,
821 &sensor_dev_attr_in4_max.dev_attr.attr,
822 &sensor_dev_attr_in5_max.dev_attr.attr,
823 &sensor_dev_attr_in6_max.dev_attr.attr,
824 &sensor_dev_attr_in7_max.dev_attr.attr,
826 &sensor_dev_attr_temp1_input.dev_attr.attr,
827 &sensor_dev_attr_temp2_input.dev_attr.attr,
828 &sensor_dev_attr_temp3_input.dev_attr.attr,
829 &sensor_dev_attr_temp1_max.dev_attr.attr,
830 &sensor_dev_attr_temp2_max.dev_attr.attr,
831 &sensor_dev_attr_temp3_max.dev_attr.attr,
832 &sensor_dev_attr_temp1_min.dev_attr.attr,
833 &sensor_dev_attr_temp2_min.dev_attr.attr,
834 &sensor_dev_attr_temp3_min.dev_attr.attr,
835 &sensor_dev_attr_temp1_type.dev_attr.attr,
836 &sensor_dev_attr_temp2_type.dev_attr.attr,
837 &sensor_dev_attr_temp3_type.dev_attr.attr,
839 &dev_attr_alarms.attr,
843 static const struct attribute_group it87_group = {
844 .attrs = it87_attributes,
847 static struct attribute *it87_attributes_opt[] = {
848 &sensor_dev_attr_fan1_input16.dev_attr.attr,
849 &sensor_dev_attr_fan1_min16.dev_attr.attr,
850 &sensor_dev_attr_fan2_input16.dev_attr.attr,
851 &sensor_dev_attr_fan2_min16.dev_attr.attr,
852 &sensor_dev_attr_fan3_input16.dev_attr.attr,
853 &sensor_dev_attr_fan3_min16.dev_attr.attr,
855 &sensor_dev_attr_fan1_input.dev_attr.attr,
856 &sensor_dev_attr_fan1_min.dev_attr.attr,
857 &sensor_dev_attr_fan1_div.dev_attr.attr,
858 &sensor_dev_attr_fan2_input.dev_attr.attr,
859 &sensor_dev_attr_fan2_min.dev_attr.attr,
860 &sensor_dev_attr_fan2_div.dev_attr.attr,
861 &sensor_dev_attr_fan3_input.dev_attr.attr,
862 &sensor_dev_attr_fan3_min.dev_attr.attr,
863 &sensor_dev_attr_fan3_div.dev_attr.attr,
865 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
866 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
867 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
868 &sensor_dev_attr_pwm1.dev_attr.attr,
869 &sensor_dev_attr_pwm2.dev_attr.attr,
870 &sensor_dev_attr_pwm3.dev_attr.attr,
873 &dev_attr_cpu0_vid.attr,
877 static const struct attribute_group it87_group_opt = {
878 .attrs = it87_attributes_opt,
881 /* SuperIO detection - will change isa_address if a chip is found */
882 static int __init it87_find(unsigned short *address)
887 chip_type = superio_inw(DEVID);
888 if (chip_type != IT8712F_DEVID
889 && chip_type != IT8716F_DEVID
890 && chip_type != IT8726F_DEVID
891 && chip_type != IT8718F_DEVID
892 && chip_type != IT8705F_DEVID)
896 if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
897 pr_info("it87: Device not activated, skipping\n");
901 *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
903 pr_info("it87: Base address not set, skipping\n");
908 pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
909 chip_type, *address, superio_inb(DEVREV) & 0x0f);
911 /* Read GPIO config and VID value from LDN 7 (GPIO) */
912 if (chip_type != IT8705F_DEVID) {
915 superio_select(GPIO);
916 if (chip_type == it8718)
917 vid_value = superio_inb(IT87_SIO_VID_REG);
919 reg = superio_inb(IT87_SIO_PINX2_REG);
921 pr_info("it87: in3 is VCC (+5V)\n");
923 pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
931 /* This function is called by i2c_probe */
932 static int it87_detect(struct i2c_adapter *adapter)
934 struct i2c_client *new_client;
935 struct it87_data *data;
938 int enable_pwm_interface;
940 /* Reserve the ISA region */
941 if (!request_region(isa_address, IT87_EXTENT,
942 it87_isa_driver.driver.name)){
947 if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
952 new_client = &data->client;
953 i2c_set_clientdata(new_client, data);
954 new_client->addr = isa_address;
955 new_client->adapter = adapter;
956 new_client->driver = &it87_isa_driver;
958 /* Now, we do the remaining detection. */
959 if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
960 || it87_read_value(new_client, IT87_REG_CHIPID) != 0x90) {
965 /* Determine the chip type. */
986 /* Fill in the remaining client fields and put it into the global list */
987 strlcpy(new_client->name, name, I2C_NAME_SIZE);
988 mutex_init(&data->update_lock);
990 /* Tell the I2C layer a new client has arrived */
991 if ((err = i2c_attach_client(new_client)))
994 /* Check PWM configuration */
995 enable_pwm_interface = it87_check_pwm(new_client);
997 /* Initialize the IT87 chip */
998 it87_init_client(new_client, data);
1000 /* Register sysfs hooks */
1001 if ((err = sysfs_create_group(&new_client->dev.kobj, &it87_group)))
1004 /* Do not create fan files for disabled fans */
1005 if (data->type == it8716 || data->type == it8718) {
1006 /* 16-bit tachometers */
1007 if (data->has_fan & (1 << 0)) {
1008 if ((err = device_create_file(&new_client->dev,
1009 &sensor_dev_attr_fan1_input16.dev_attr))
1010 || (err = device_create_file(&new_client->dev,
1011 &sensor_dev_attr_fan1_min16.dev_attr)))
1014 if (data->has_fan & (1 << 1)) {
1015 if ((err = device_create_file(&new_client->dev,
1016 &sensor_dev_attr_fan2_input16.dev_attr))
1017 || (err = device_create_file(&new_client->dev,
1018 &sensor_dev_attr_fan2_min16.dev_attr)))
1021 if (data->has_fan & (1 << 2)) {
1022 if ((err = device_create_file(&new_client->dev,
1023 &sensor_dev_attr_fan3_input16.dev_attr))
1024 || (err = device_create_file(&new_client->dev,
1025 &sensor_dev_attr_fan3_min16.dev_attr)))
1029 /* 8-bit tachometers with clock divider */
1030 if (data->has_fan & (1 << 0)) {
1031 if ((err = device_create_file(&new_client->dev,
1032 &sensor_dev_attr_fan1_input.dev_attr))
1033 || (err = device_create_file(&new_client->dev,
1034 &sensor_dev_attr_fan1_min.dev_attr))
1035 || (err = device_create_file(&new_client->dev,
1036 &sensor_dev_attr_fan1_div.dev_attr)))
1039 if (data->has_fan & (1 << 1)) {
1040 if ((err = device_create_file(&new_client->dev,
1041 &sensor_dev_attr_fan2_input.dev_attr))
1042 || (err = device_create_file(&new_client->dev,
1043 &sensor_dev_attr_fan2_min.dev_attr))
1044 || (err = device_create_file(&new_client->dev,
1045 &sensor_dev_attr_fan2_div.dev_attr)))
1048 if (data->has_fan & (1 << 2)) {
1049 if ((err = device_create_file(&new_client->dev,
1050 &sensor_dev_attr_fan3_input.dev_attr))
1051 || (err = device_create_file(&new_client->dev,
1052 &sensor_dev_attr_fan3_min.dev_attr))
1053 || (err = device_create_file(&new_client->dev,
1054 &sensor_dev_attr_fan3_div.dev_attr)))
1059 if (enable_pwm_interface) {
1060 if ((err = device_create_file(&new_client->dev,
1061 &sensor_dev_attr_pwm1_enable.dev_attr))
1062 || (err = device_create_file(&new_client->dev,
1063 &sensor_dev_attr_pwm2_enable.dev_attr))
1064 || (err = device_create_file(&new_client->dev,
1065 &sensor_dev_attr_pwm3_enable.dev_attr))
1066 || (err = device_create_file(&new_client->dev,
1067 &sensor_dev_attr_pwm1.dev_attr))
1068 || (err = device_create_file(&new_client->dev,
1069 &sensor_dev_attr_pwm2.dev_attr))
1070 || (err = device_create_file(&new_client->dev,
1071 &sensor_dev_attr_pwm3.dev_attr))
1072 || (err = device_create_file(&new_client->dev,
1073 &dev_attr_pwm1_freq))
1074 || (err = device_create_file(&new_client->dev,
1075 &dev_attr_pwm2_freq))
1076 || (err = device_create_file(&new_client->dev,
1077 &dev_attr_pwm3_freq)))
1081 if (data->type == it8712 || data->type == it8716
1082 || data->type == it8718) {
1083 data->vrm = vid_which_vrm();
1084 /* VID reading from Super-I/O config space if available */
1085 data->vid = vid_value;
1086 if ((err = device_create_file(&new_client->dev,
1088 || (err = device_create_file(&new_client->dev,
1089 &dev_attr_cpu0_vid)))
1093 data->class_dev = hwmon_device_register(&new_client->dev);
1094 if (IS_ERR(data->class_dev)) {
1095 err = PTR_ERR(data->class_dev);
1102 sysfs_remove_group(&new_client->dev.kobj, &it87_group);
1103 sysfs_remove_group(&new_client->dev.kobj, &it87_group_opt);
1105 i2c_detach_client(new_client);
1109 release_region(isa_address, IT87_EXTENT);
1114 static int it87_detach_client(struct i2c_client *client)
1116 struct it87_data *data = i2c_get_clientdata(client);
1119 hwmon_device_unregister(data->class_dev);
1120 sysfs_remove_group(&client->dev.kobj, &it87_group);
1121 sysfs_remove_group(&client->dev.kobj, &it87_group_opt);
1123 if ((err = i2c_detach_client(client)))
1126 release_region(client->addr, IT87_EXTENT);
1132 /* Must be called with data->update_lock held, except during initialization.
1133 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1134 would slow down the IT87 access and should not be necessary. */
1135 static int it87_read_value(struct i2c_client *client, u8 reg)
1137 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
1138 return inb_p(client->addr + IT87_DATA_REG_OFFSET);
1141 /* Must be called with data->update_lock held, except during initialization.
1142 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1143 would slow down the IT87 access and should not be necessary. */
1144 static void it87_write_value(struct i2c_client *client, u8 reg, u8 value)
1146 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
1147 outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
1150 /* Return 1 if and only if the PWM interface is safe to use */
1151 static int it87_check_pwm(struct i2c_client *client)
1153 /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1154 * and polarity set to active low is sign that this is the case so we
1155 * disable pwm control to protect the user. */
1156 int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
1157 if ((tmp & 0x87) == 0) {
1158 if (fix_pwm_polarity) {
1159 /* The user asks us to attempt a chip reconfiguration.
1160 * This means switching to active high polarity and
1161 * inverting all fan speed values. */
1165 for (i = 0; i < 3; i++)
1166 pwm[i] = it87_read_value(client,
1169 /* If any fan is in automatic pwm mode, the polarity
1170 * might be correct, as suspicious as it seems, so we
1171 * better don't change anything (but still disable the
1172 * PWM interface). */
1173 if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1174 dev_info(&client->dev, "Reconfiguring PWM to "
1175 "active high polarity\n");
1176 it87_write_value(client, IT87_REG_FAN_CTL,
1178 for (i = 0; i < 3; i++)
1179 it87_write_value(client,
1185 dev_info(&client->dev, "PWM configuration is "
1186 "too broken to be fixed\n");
1189 dev_info(&client->dev, "Detected broken BIOS "
1190 "defaults, disabling PWM interface\n");
1192 } else if (fix_pwm_polarity) {
1193 dev_info(&client->dev, "PWM configuration looks "
1194 "sane, won't touch\n");
1200 /* Called when we have found a new IT87. */
1201 static void it87_init_client(struct i2c_client *client, struct it87_data *data)
1205 /* initialize to sane defaults:
1206 * - if the chip is in manual pwm mode, this will be overwritten with
1207 * the actual settings on the chip (so in this case, initialization
1209 * - if in automatic or on/off mode, we could switch to manual mode,
1210 * read the registers and set manual_pwm_ctl accordingly, but currently
1211 * this is not implemented, so we initialize to something sane */
1212 for (i = 0; i < 3; i++) {
1213 data->manual_pwm_ctl[i] = 0xff;
1216 /* Some chips seem to have default value 0xff for all limit
1217 * registers. For low voltage limits it makes no sense and triggers
1218 * alarms, so change to 0 instead. For high temperature limits, it
1219 * means -1 degree C, which surprisingly doesn't trigger an alarm,
1220 * but is still confusing, so change to 127 degrees C. */
1221 for (i = 0; i < 8; i++) {
1222 tmp = it87_read_value(client, IT87_REG_VIN_MIN(i));
1224 it87_write_value(client, IT87_REG_VIN_MIN(i), 0);
1226 for (i = 0; i < 3; i++) {
1227 tmp = it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1229 it87_write_value(client, IT87_REG_TEMP_HIGH(i), 127);
1232 /* Check if temperature channnels are reset manually or by some reason */
1233 tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1234 if ((tmp & 0x3f) == 0) {
1235 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1236 tmp = (tmp & 0xc0) | 0x2a;
1237 it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
1241 /* Check if voltage monitors are reset manually or by some reason */
1242 tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
1243 if ((tmp & 0xff) == 0) {
1244 /* Enable all voltage monitors */
1245 it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
1248 /* Check if tachometers are reset manually or by some reason */
1249 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1250 if ((data->fan_main_ctrl & 0x70) == 0) {
1251 /* Enable all fan tachometers */
1252 data->fan_main_ctrl |= 0x70;
1253 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1255 data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1257 /* Set tachometers to 16-bit mode if needed */
1258 if (data->type == it8716 || data->type == it8718) {
1259 tmp = it87_read_value(client, IT87_REG_FAN_16BIT);
1260 if (~tmp & 0x07 & data->has_fan) {
1261 dev_dbg(&client->dev,
1262 "Setting fan1-3 to 16-bit mode\n");
1263 it87_write_value(client, IT87_REG_FAN_16BIT,
1268 /* Set current fan mode registers and the default settings for the
1269 * other mode registers */
1270 for (i = 0; i < 3; i++) {
1271 if (data->fan_main_ctrl & (1 << i)) {
1273 tmp = it87_read_value(client, IT87_REG_PWM(i));
1275 /* automatic pwm - not yet implemented, but
1276 * leave the settings made by the BIOS alone
1277 * until a change is requested via the sysfs
1281 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1286 /* Start monitoring */
1287 it87_write_value(client, IT87_REG_CONFIG,
1288 (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
1289 | (update_vbat ? 0x41 : 0x01));
1292 static struct it87_data *it87_update_device(struct device *dev)
1294 struct i2c_client *client = to_i2c_client(dev);
1295 struct it87_data *data = i2c_get_clientdata(client);
1298 mutex_lock(&data->update_lock);
1300 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1304 /* Cleared after each update, so reenable. Value
1305 returned by this read will be previous value */
1306 it87_write_value(client, IT87_REG_CONFIG,
1307 it87_read_value(client, IT87_REG_CONFIG) | 0x40);
1309 for (i = 0; i <= 7; i++) {
1311 it87_read_value(client, IT87_REG_VIN(i));
1313 it87_read_value(client, IT87_REG_VIN_MIN(i));
1315 it87_read_value(client, IT87_REG_VIN_MAX(i));
1317 /* in8 (battery) has no limit registers */
1319 it87_read_value(client, IT87_REG_VIN(8));
1321 for (i = 0; i < 3; i++) {
1322 /* Skip disabled fans */
1323 if (!(data->has_fan & (1 << i)))
1327 it87_read_value(client, IT87_REG_FAN_MIN(i));
1328 data->fan[i] = it87_read_value(client,
1330 /* Add high byte if in 16-bit mode */
1331 if (data->type == it8716 || data->type == it8718) {
1332 data->fan[i] |= it87_read_value(client,
1333 IT87_REG_FANX(i)) << 8;
1334 data->fan_min[i] |= it87_read_value(client,
1335 IT87_REG_FANX_MIN(i)) << 8;
1338 for (i = 0; i < 3; i++) {
1340 it87_read_value(client, IT87_REG_TEMP(i));
1341 data->temp_high[i] =
1342 it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1344 it87_read_value(client, IT87_REG_TEMP_LOW(i));
1347 /* Newer chips don't have clock dividers */
1348 if ((data->has_fan & 0x07) && data->type != it8716
1349 && data->type != it8718) {
1350 i = it87_read_value(client, IT87_REG_FAN_DIV);
1351 data->fan_div[0] = i & 0x07;
1352 data->fan_div[1] = (i >> 3) & 0x07;
1353 data->fan_div[2] = (i & 0x40) ? 3 : 1;
1357 it87_read_value(client, IT87_REG_ALARM1) |
1358 (it87_read_value(client, IT87_REG_ALARM2) << 8) |
1359 (it87_read_value(client, IT87_REG_ALARM3) << 16);
1360 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1361 data->fan_ctl = it87_read_value(client, IT87_REG_FAN_CTL);
1363 data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1364 /* The 8705 does not have VID capability */
1365 if (data->type == it8712 || data->type == it8716) {
1366 data->vid = it87_read_value(client, IT87_REG_VID);
1367 /* The older IT8712F revisions had only 5 VID pins,
1368 but we assume it is always safe to read 6 bits. */
1371 data->last_updated = jiffies;
1375 mutex_unlock(&data->update_lock);
1380 static int __init sm_it87_init(void)
1384 if ((res = it87_find(&isa_address)))
1386 return i2c_isa_add_driver(&it87_isa_driver);
1389 static void __exit sm_it87_exit(void)
1391 i2c_isa_del_driver(&it87_isa_driver);
1395 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>, "
1396 "Jean Delvare <khali@linux-fr.org>");
1397 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8726F, SiS950 driver");
1398 module_param(update_vbat, bool, 0);
1399 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1400 module_param(fix_pwm_polarity, bool, 0);
1401 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1402 MODULE_LICENSE("GPL");
1404 module_init(sm_it87_init);
1405 module_exit(sm_it87_exit);