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 Sis950 A clone of the IT8705F
11 Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com>
12 Copyright (C) 2005-2006 Jean Delvare <khali@linux-fr.org>
14 This program is free software; you can redistribute it and/or modify
15 it under the terms of the GNU General Public License as published by
16 the Free Software Foundation; either version 2 of the License, or
17 (at your option) any later version.
19 This program is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with this program; if not, write to the Free Software
26 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/jiffies.h>
33 #include <linux/i2c.h>
34 #include <linux/i2c-isa.h>
35 #include <linux/hwmon.h>
36 #include <linux/hwmon-sysfs.h>
37 #include <linux/hwmon-vid.h>
38 #include <linux/err.h>
39 #include <linux/mutex.h>
40 #include <linux/sysfs.h>
44 static unsigned short isa_address;
45 enum chips { it87, it8712, it8716, it8718 };
47 #define REG 0x2e /* The register to read/write */
48 #define DEV 0x07 /* Register: Logical device select */
49 #define VAL 0x2f /* The value to read/write */
50 #define PME 0x04 /* The device with the fan registers in it */
51 #define GPIO 0x07 /* The device with the IT8718F VID value in it */
52 #define DEVID 0x20 /* Register: Device ID */
53 #define DEVREV 0x22 /* Register: Device Revision */
62 static int superio_inw(int reg)
73 superio_select(int ldn)
95 /* Logical device 4 registers */
96 #define IT8712F_DEVID 0x8712
97 #define IT8705F_DEVID 0x8705
98 #define IT8716F_DEVID 0x8716
99 #define IT8718F_DEVID 0x8718
100 #define IT87_ACT_REG 0x30
101 #define IT87_BASE_REG 0x60
103 /* Logical device 7 registers (IT8712F and later) */
104 #define IT87_SIO_PINX2_REG 0x2c /* Pin selection */
105 #define IT87_SIO_VID_REG 0xfc /* VID value */
107 /* Update battery voltage after every reading if true */
108 static int update_vbat;
110 /* Not all BIOSes properly configure the PWM registers */
111 static int fix_pwm_polarity;
113 /* Values read from Super-I/O config space */
114 static u16 chip_type;
117 /* Many IT87 constants specified below */
119 /* Length of ISA address segment */
120 #define IT87_EXTENT 8
122 /* Where are the ISA address/data registers relative to the base address */
123 #define IT87_ADDR_REG_OFFSET 5
124 #define IT87_DATA_REG_OFFSET 6
126 /*----- The IT87 registers -----*/
128 #define IT87_REG_CONFIG 0x00
130 #define IT87_REG_ALARM1 0x01
131 #define IT87_REG_ALARM2 0x02
132 #define IT87_REG_ALARM3 0x03
134 /* The IT8718F has the VID value in a different register, in Super-I/O
135 configuration space. */
136 #define IT87_REG_VID 0x0a
137 /* Warning: register 0x0b is used for something completely different in
138 new chips/revisions. I suspect only 16-bit tachometer mode will work
140 #define IT87_REG_FAN_DIV 0x0b
141 #define IT87_REG_FAN_16BIT 0x0c
143 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
145 #define IT87_REG_FAN(nr) (0x0d + (nr))
146 #define IT87_REG_FAN_MIN(nr) (0x10 + (nr))
147 #define IT87_REG_FANX(nr) (0x18 + (nr))
148 #define IT87_REG_FANX_MIN(nr) (0x1b + (nr))
149 #define IT87_REG_FAN_MAIN_CTRL 0x13
150 #define IT87_REG_FAN_CTL 0x14
151 #define IT87_REG_PWM(nr) (0x15 + (nr))
153 #define IT87_REG_VIN(nr) (0x20 + (nr))
154 #define IT87_REG_TEMP(nr) (0x29 + (nr))
156 #define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2)
157 #define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2)
158 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
159 #define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2)
161 #define IT87_REG_VIN_ENABLE 0x50
162 #define IT87_REG_TEMP_ENABLE 0x51
164 #define IT87_REG_CHIPID 0x58
166 #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255))
167 #define IN_FROM_REG(val) ((val) * 16)
169 static inline u8 FAN_TO_REG(long rpm, int div)
173 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
174 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
178 static inline u16 FAN16_TO_REG(long rpm)
182 return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
185 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
186 /* The divider is fixed to 2 in 16-bit mode */
187 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
189 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
190 ((val)+500)/1000),-128,127))
191 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
193 #define PWM_TO_REG(val) ((val) >> 1)
194 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
196 static int DIV_TO_REG(int val)
199 while (answer < 7 && (val >>= 1))
203 #define DIV_FROM_REG(val) (1 << (val))
205 static const unsigned int pwm_freq[8] = {
217 /* For each registered IT87, we need to keep some data in memory. That
218 data is pointed to by it87_list[NR]->data. The structure itself is
219 dynamically allocated, at the same time when a new it87 client is
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 != IT8718F_DEVID
891 && chip_type != IT8705F_DEVID)
895 if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
896 pr_info("it87: Device not activated, skipping\n");
900 *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
902 pr_info("it87: Base address not set, skipping\n");
907 pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
908 chip_type, *address, superio_inb(DEVREV) & 0x0f);
910 /* Read GPIO config and VID value from LDN 7 (GPIO) */
911 if (chip_type != IT8705F_DEVID) {
914 superio_select(GPIO);
915 if (chip_type == it8718)
916 vid_value = superio_inb(IT87_SIO_VID_REG);
918 reg = superio_inb(IT87_SIO_PINX2_REG);
920 pr_info("it87: in3 is VCC (+5V)\n");
922 pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
930 /* This function is called by i2c_probe */
931 static int it87_detect(struct i2c_adapter *adapter)
933 struct i2c_client *new_client;
934 struct it87_data *data;
937 int enable_pwm_interface;
939 /* Reserve the ISA region */
940 if (!request_region(isa_address, IT87_EXTENT,
941 it87_isa_driver.driver.name)){
946 if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
951 new_client = &data->client;
952 i2c_set_clientdata(new_client, data);
953 new_client->addr = isa_address;
954 new_client->adapter = adapter;
955 new_client->driver = &it87_isa_driver;
957 /* Now, we do the remaining detection. */
958 if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
959 || it87_read_value(new_client, IT87_REG_CHIPID) != 0x90) {
964 /* Determine the chip type. */
983 /* Fill in the remaining client fields and put it into the global list */
984 strlcpy(new_client->name, name, I2C_NAME_SIZE);
985 mutex_init(&data->update_lock);
987 /* Tell the I2C layer a new client has arrived */
988 if ((err = i2c_attach_client(new_client)))
991 /* Check PWM configuration */
992 enable_pwm_interface = it87_check_pwm(new_client);
994 /* Initialize the IT87 chip */
995 it87_init_client(new_client, data);
997 /* Register sysfs hooks */
998 if ((err = sysfs_create_group(&new_client->dev.kobj, &it87_group)))
1001 /* Do not create fan files for disabled fans */
1002 if (data->type == it8716 || data->type == it8718) {
1003 /* 16-bit tachometers */
1004 if (data->has_fan & (1 << 0)) {
1005 if ((err = device_create_file(&new_client->dev,
1006 &sensor_dev_attr_fan1_input16.dev_attr))
1007 || (err = device_create_file(&new_client->dev,
1008 &sensor_dev_attr_fan1_min16.dev_attr)))
1011 if (data->has_fan & (1 << 1)) {
1012 if ((err = device_create_file(&new_client->dev,
1013 &sensor_dev_attr_fan2_input16.dev_attr))
1014 || (err = device_create_file(&new_client->dev,
1015 &sensor_dev_attr_fan2_min16.dev_attr)))
1018 if (data->has_fan & (1 << 2)) {
1019 if ((err = device_create_file(&new_client->dev,
1020 &sensor_dev_attr_fan3_input16.dev_attr))
1021 || (err = device_create_file(&new_client->dev,
1022 &sensor_dev_attr_fan3_min16.dev_attr)))
1026 /* 8-bit tachometers with clock divider */
1027 if (data->has_fan & (1 << 0)) {
1028 if ((err = device_create_file(&new_client->dev,
1029 &sensor_dev_attr_fan1_input.dev_attr))
1030 || (err = device_create_file(&new_client->dev,
1031 &sensor_dev_attr_fan1_min.dev_attr))
1032 || (err = device_create_file(&new_client->dev,
1033 &sensor_dev_attr_fan1_div.dev_attr)))
1036 if (data->has_fan & (1 << 1)) {
1037 if ((err = device_create_file(&new_client->dev,
1038 &sensor_dev_attr_fan2_input.dev_attr))
1039 || (err = device_create_file(&new_client->dev,
1040 &sensor_dev_attr_fan2_min.dev_attr))
1041 || (err = device_create_file(&new_client->dev,
1042 &sensor_dev_attr_fan2_div.dev_attr)))
1045 if (data->has_fan & (1 << 2)) {
1046 if ((err = device_create_file(&new_client->dev,
1047 &sensor_dev_attr_fan3_input.dev_attr))
1048 || (err = device_create_file(&new_client->dev,
1049 &sensor_dev_attr_fan3_min.dev_attr))
1050 || (err = device_create_file(&new_client->dev,
1051 &sensor_dev_attr_fan3_div.dev_attr)))
1056 if (enable_pwm_interface) {
1057 if ((err = device_create_file(&new_client->dev,
1058 &sensor_dev_attr_pwm1_enable.dev_attr))
1059 || (err = device_create_file(&new_client->dev,
1060 &sensor_dev_attr_pwm2_enable.dev_attr))
1061 || (err = device_create_file(&new_client->dev,
1062 &sensor_dev_attr_pwm3_enable.dev_attr))
1063 || (err = device_create_file(&new_client->dev,
1064 &sensor_dev_attr_pwm1.dev_attr))
1065 || (err = device_create_file(&new_client->dev,
1066 &sensor_dev_attr_pwm2.dev_attr))
1067 || (err = device_create_file(&new_client->dev,
1068 &sensor_dev_attr_pwm3.dev_attr))
1069 || (err = device_create_file(&new_client->dev,
1070 &dev_attr_pwm1_freq))
1071 || (err = device_create_file(&new_client->dev,
1072 &dev_attr_pwm2_freq))
1073 || (err = device_create_file(&new_client->dev,
1074 &dev_attr_pwm3_freq)))
1078 if (data->type == it8712 || data->type == it8716
1079 || data->type == it8718) {
1080 data->vrm = vid_which_vrm();
1081 /* VID reading from Super-I/O config space if available */
1082 data->vid = vid_value;
1083 if ((err = device_create_file(&new_client->dev,
1085 || (err = device_create_file(&new_client->dev,
1086 &dev_attr_cpu0_vid)))
1090 data->class_dev = hwmon_device_register(&new_client->dev);
1091 if (IS_ERR(data->class_dev)) {
1092 err = PTR_ERR(data->class_dev);
1099 sysfs_remove_group(&new_client->dev.kobj, &it87_group);
1100 sysfs_remove_group(&new_client->dev.kobj, &it87_group_opt);
1102 i2c_detach_client(new_client);
1106 release_region(isa_address, IT87_EXTENT);
1111 static int it87_detach_client(struct i2c_client *client)
1113 struct it87_data *data = i2c_get_clientdata(client);
1116 hwmon_device_unregister(data->class_dev);
1117 sysfs_remove_group(&client->dev.kobj, &it87_group);
1118 sysfs_remove_group(&client->dev.kobj, &it87_group_opt);
1120 if ((err = i2c_detach_client(client)))
1123 release_region(client->addr, IT87_EXTENT);
1129 /* Must be called with data->update_lock held, except during initialization.
1130 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1131 would slow down the IT87 access and should not be necessary. */
1132 static int it87_read_value(struct i2c_client *client, u8 reg)
1134 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
1135 return inb_p(client->addr + IT87_DATA_REG_OFFSET);
1138 /* Must be called with data->update_lock held, except during initialization.
1139 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1140 would slow down the IT87 access and should not be necessary. */
1141 static void it87_write_value(struct i2c_client *client, u8 reg, u8 value)
1143 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
1144 outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
1147 /* Return 1 if and only if the PWM interface is safe to use */
1148 static int it87_check_pwm(struct i2c_client *client)
1150 /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1151 * and polarity set to active low is sign that this is the case so we
1152 * disable pwm control to protect the user. */
1153 int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
1154 if ((tmp & 0x87) == 0) {
1155 if (fix_pwm_polarity) {
1156 /* The user asks us to attempt a chip reconfiguration.
1157 * This means switching to active high polarity and
1158 * inverting all fan speed values. */
1162 for (i = 0; i < 3; i++)
1163 pwm[i] = it87_read_value(client,
1166 /* If any fan is in automatic pwm mode, the polarity
1167 * might be correct, as suspicious as it seems, so we
1168 * better don't change anything (but still disable the
1169 * PWM interface). */
1170 if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1171 dev_info(&client->dev, "Reconfiguring PWM to "
1172 "active high polarity\n");
1173 it87_write_value(client, IT87_REG_FAN_CTL,
1175 for (i = 0; i < 3; i++)
1176 it87_write_value(client,
1182 dev_info(&client->dev, "PWM configuration is "
1183 "too broken to be fixed\n");
1186 dev_info(&client->dev, "Detected broken BIOS "
1187 "defaults, disabling PWM interface\n");
1189 } else if (fix_pwm_polarity) {
1190 dev_info(&client->dev, "PWM configuration looks "
1191 "sane, won't touch\n");
1197 /* Called when we have found a new IT87. */
1198 static void it87_init_client(struct i2c_client *client, struct it87_data *data)
1202 /* initialize to sane defaults:
1203 * - if the chip is in manual pwm mode, this will be overwritten with
1204 * the actual settings on the chip (so in this case, initialization
1206 * - if in automatic or on/off mode, we could switch to manual mode,
1207 * read the registers and set manual_pwm_ctl accordingly, but currently
1208 * this is not implemented, so we initialize to something sane */
1209 for (i = 0; i < 3; i++) {
1210 data->manual_pwm_ctl[i] = 0xff;
1213 /* Some chips seem to have default value 0xff for all limit
1214 * registers. For low voltage limits it makes no sense and triggers
1215 * alarms, so change to 0 instead. For high temperature limits, it
1216 * means -1 degree C, which surprisingly doesn't trigger an alarm,
1217 * but is still confusing, so change to 127 degrees C. */
1218 for (i = 0; i < 8; i++) {
1219 tmp = it87_read_value(client, IT87_REG_VIN_MIN(i));
1221 it87_write_value(client, IT87_REG_VIN_MIN(i), 0);
1223 for (i = 0; i < 3; i++) {
1224 tmp = it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1226 it87_write_value(client, IT87_REG_TEMP_HIGH(i), 127);
1229 /* Check if temperature channnels are reset manually or by some reason */
1230 tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1231 if ((tmp & 0x3f) == 0) {
1232 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1233 tmp = (tmp & 0xc0) | 0x2a;
1234 it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
1238 /* Check if voltage monitors are reset manually or by some reason */
1239 tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
1240 if ((tmp & 0xff) == 0) {
1241 /* Enable all voltage monitors */
1242 it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
1245 /* Check if tachometers are reset manually or by some reason */
1246 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1247 if ((data->fan_main_ctrl & 0x70) == 0) {
1248 /* Enable all fan tachometers */
1249 data->fan_main_ctrl |= 0x70;
1250 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1252 data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1254 /* Set tachometers to 16-bit mode if needed */
1255 if (data->type == it8716 || data->type == it8718) {
1256 tmp = it87_read_value(client, IT87_REG_FAN_16BIT);
1257 if (~tmp & 0x07 & data->has_fan) {
1258 dev_dbg(&client->dev,
1259 "Setting fan1-3 to 16-bit mode\n");
1260 it87_write_value(client, IT87_REG_FAN_16BIT,
1265 /* Set current fan mode registers and the default settings for the
1266 * other mode registers */
1267 for (i = 0; i < 3; i++) {
1268 if (data->fan_main_ctrl & (1 << i)) {
1270 tmp = it87_read_value(client, IT87_REG_PWM(i));
1272 /* automatic pwm - not yet implemented, but
1273 * leave the settings made by the BIOS alone
1274 * until a change is requested via the sysfs
1278 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1283 /* Start monitoring */
1284 it87_write_value(client, IT87_REG_CONFIG,
1285 (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
1286 | (update_vbat ? 0x41 : 0x01));
1289 static struct it87_data *it87_update_device(struct device *dev)
1291 struct i2c_client *client = to_i2c_client(dev);
1292 struct it87_data *data = i2c_get_clientdata(client);
1295 mutex_lock(&data->update_lock);
1297 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1301 /* Cleared after each update, so reenable. Value
1302 returned by this read will be previous value */
1303 it87_write_value(client, IT87_REG_CONFIG,
1304 it87_read_value(client, IT87_REG_CONFIG) | 0x40);
1306 for (i = 0; i <= 7; i++) {
1308 it87_read_value(client, IT87_REG_VIN(i));
1310 it87_read_value(client, IT87_REG_VIN_MIN(i));
1312 it87_read_value(client, IT87_REG_VIN_MAX(i));
1314 /* in8 (battery) has no limit registers */
1316 it87_read_value(client, IT87_REG_VIN(8));
1318 for (i = 0; i < 3; i++) {
1319 /* Skip disabled fans */
1320 if (!(data->has_fan & (1 << i)))
1324 it87_read_value(client, IT87_REG_FAN_MIN(i));
1325 data->fan[i] = it87_read_value(client,
1327 /* Add high byte if in 16-bit mode */
1328 if (data->type == it8716 || data->type == it8718) {
1329 data->fan[i] |= it87_read_value(client,
1330 IT87_REG_FANX(i)) << 8;
1331 data->fan_min[i] |= it87_read_value(client,
1332 IT87_REG_FANX_MIN(i)) << 8;
1335 for (i = 0; i < 3; i++) {
1337 it87_read_value(client, IT87_REG_TEMP(i));
1338 data->temp_high[i] =
1339 it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1341 it87_read_value(client, IT87_REG_TEMP_LOW(i));
1344 /* Newer chips don't have clock dividers */
1345 if ((data->has_fan & 0x07) && data->type != it8716
1346 && data->type != it8718) {
1347 i = it87_read_value(client, IT87_REG_FAN_DIV);
1348 data->fan_div[0] = i & 0x07;
1349 data->fan_div[1] = (i >> 3) & 0x07;
1350 data->fan_div[2] = (i & 0x40) ? 3 : 1;
1354 it87_read_value(client, IT87_REG_ALARM1) |
1355 (it87_read_value(client, IT87_REG_ALARM2) << 8) |
1356 (it87_read_value(client, IT87_REG_ALARM3) << 16);
1357 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1358 data->fan_ctl = it87_read_value(client, IT87_REG_FAN_CTL);
1360 data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1361 /* The 8705 does not have VID capability */
1362 if (data->type == it8712 || data->type == it8716) {
1363 data->vid = it87_read_value(client, IT87_REG_VID);
1364 /* The older IT8712F revisions had only 5 VID pins,
1365 but we assume it is always safe to read 6 bits. */
1368 data->last_updated = jiffies;
1372 mutex_unlock(&data->update_lock);
1377 static int __init sm_it87_init(void)
1381 if ((res = it87_find(&isa_address)))
1383 return i2c_isa_add_driver(&it87_isa_driver);
1386 static void __exit sm_it87_exit(void)
1388 i2c_isa_del_driver(&it87_isa_driver);
1392 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>, "
1393 "Jean Delvare <khali@linux-fr.org>");
1394 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F, SiS950 driver");
1395 module_param(update_vbat, bool, 0);
1396 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1397 module_param(fix_pwm_polarity, bool, 0);
1398 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1399 MODULE_LICENSE("GPL");
1401 module_init(sm_it87_init);
1402 module_exit(sm_it87_exit);