xref: /openbmc/linux/drivers/hwmon/it87.c (revision a09d2831)
1 /*
2     it87.c - Part of lm_sensors, Linux kernel modules for hardware
3              monitoring.
4 
5     The IT8705F is an LPC-based Super I/O part that contains UARTs, a
6     parallel port, an IR port, a MIDI port, a floppy controller, etc., in
7     addition to an Environment Controller (Enhanced Hardware Monitor and
8     Fan Controller)
9 
10     This driver supports only the Environment Controller in the IT8705F and
11     similar parts.  The other devices are supported by different drivers.
12 
13     Supports: IT8705F  Super I/O chip w/LPC interface
14               IT8712F  Super I/O chip w/LPC interface
15               IT8716F  Super I/O chip w/LPC interface
16               IT8718F  Super I/O chip w/LPC interface
17               IT8720F  Super I/O chip w/LPC interface
18               IT8726F  Super I/O chip w/LPC interface
19               Sis950   A clone of the IT8705F
20 
21     Copyright (C) 2001 Chris Gauthron
22     Copyright (C) 2005-2007 Jean Delvare <khali@linux-fr.org>
23 
24     This program is free software; you can redistribute it and/or modify
25     it under the terms of the GNU General Public License as published by
26     the Free Software Foundation; either version 2 of the License, or
27     (at your option) any later version.
28 
29     This program is distributed in the hope that it will be useful,
30     but WITHOUT ANY WARRANTY; without even the implied warranty of
31     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
32     GNU General Public License for more details.
33 
34     You should have received a copy of the GNU General Public License
35     along with this program; if not, write to the Free Software
36     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
37 */
38 
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/jiffies.h>
43 #include <linux/platform_device.h>
44 #include <linux/hwmon.h>
45 #include <linux/hwmon-sysfs.h>
46 #include <linux/hwmon-vid.h>
47 #include <linux/err.h>
48 #include <linux/mutex.h>
49 #include <linux/sysfs.h>
50 #include <linux/string.h>
51 #include <linux/dmi.h>
52 #include <linux/acpi.h>
53 #include <linux/io.h>
54 
55 #define DRVNAME "it87"
56 
57 enum chips { it87, it8712, it8716, it8718, it8720 };
58 
59 static unsigned short force_id;
60 module_param(force_id, ushort, 0);
61 MODULE_PARM_DESC(force_id, "Override the detected device ID");
62 
63 static struct platform_device *pdev;
64 
65 #define	REG	0x2e	/* The register to read/write */
66 #define	DEV	0x07	/* Register: Logical device select */
67 #define	VAL	0x2f	/* The value to read/write */
68 #define PME	0x04	/* The device with the fan registers in it */
69 
70 /* The device with the IT8718F/IT8720F VID value in it */
71 #define GPIO	0x07
72 
73 #define	DEVID	0x20	/* Register: Device ID */
74 #define	DEVREV	0x22	/* Register: Device Revision */
75 
76 static inline int
77 superio_inb(int reg)
78 {
79 	outb(reg, REG);
80 	return inb(VAL);
81 }
82 
83 static int superio_inw(int reg)
84 {
85 	int val;
86 	outb(reg++, REG);
87 	val = inb(VAL) << 8;
88 	outb(reg, REG);
89 	val |= inb(VAL);
90 	return val;
91 }
92 
93 static inline void
94 superio_select(int ldn)
95 {
96 	outb(DEV, REG);
97 	outb(ldn, VAL);
98 }
99 
100 static inline void
101 superio_enter(void)
102 {
103 	outb(0x87, REG);
104 	outb(0x01, REG);
105 	outb(0x55, REG);
106 	outb(0x55, REG);
107 }
108 
109 static inline void
110 superio_exit(void)
111 {
112 	outb(0x02, REG);
113 	outb(0x02, VAL);
114 }
115 
116 /* Logical device 4 registers */
117 #define IT8712F_DEVID 0x8712
118 #define IT8705F_DEVID 0x8705
119 #define IT8716F_DEVID 0x8716
120 #define IT8718F_DEVID 0x8718
121 #define IT8720F_DEVID 0x8720
122 #define IT8726F_DEVID 0x8726
123 #define IT87_ACT_REG  0x30
124 #define IT87_BASE_REG 0x60
125 
126 /* Logical device 7 registers (IT8712F and later) */
127 #define IT87_SIO_GPIO3_REG	0x27
128 #define IT87_SIO_GPIO5_REG	0x29
129 #define IT87_SIO_PINX2_REG	0x2c	/* Pin selection */
130 #define IT87_SIO_VID_REG	0xfc	/* VID value */
131 
132 /* Update battery voltage after every reading if true */
133 static int update_vbat;
134 
135 /* Not all BIOSes properly configure the PWM registers */
136 static int fix_pwm_polarity;
137 
138 /* Many IT87 constants specified below */
139 
140 /* Length of ISA address segment */
141 #define IT87_EXTENT 8
142 
143 /* Length of ISA address segment for Environmental Controller */
144 #define IT87_EC_EXTENT 2
145 
146 /* Offset of EC registers from ISA base address */
147 #define IT87_EC_OFFSET 5
148 
149 /* Where are the ISA address/data registers relative to the EC base address */
150 #define IT87_ADDR_REG_OFFSET 0
151 #define IT87_DATA_REG_OFFSET 1
152 
153 /*----- The IT87 registers -----*/
154 
155 #define IT87_REG_CONFIG        0x00
156 
157 #define IT87_REG_ALARM1        0x01
158 #define IT87_REG_ALARM2        0x02
159 #define IT87_REG_ALARM3        0x03
160 
161 /* The IT8718F and IT8720F have the VID value in a different register, in
162    Super-I/O configuration space. */
163 #define IT87_REG_VID           0x0a
164 /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
165    for fan divisors. Later IT8712F revisions must use 16-bit tachometer
166    mode. */
167 #define IT87_REG_FAN_DIV       0x0b
168 #define IT87_REG_FAN_16BIT     0x0c
169 
170 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
171 
172 static const u8 IT87_REG_FAN[]		= { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
173 static const u8 IT87_REG_FAN_MIN[]	= { 0x10, 0x11, 0x12, 0x84, 0x86 };
174 static const u8 IT87_REG_FANX[]		= { 0x18, 0x19, 0x1a, 0x81, 0x83 };
175 static const u8 IT87_REG_FANX_MIN[]	= { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
176 #define IT87_REG_FAN_MAIN_CTRL 0x13
177 #define IT87_REG_FAN_CTL       0x14
178 #define IT87_REG_PWM(nr)       (0x15 + (nr))
179 
180 #define IT87_REG_VIN(nr)       (0x20 + (nr))
181 #define IT87_REG_TEMP(nr)      (0x29 + (nr))
182 
183 #define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
184 #define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
185 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
186 #define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
187 
188 #define IT87_REG_VIN_ENABLE    0x50
189 #define IT87_REG_TEMP_ENABLE   0x51
190 
191 #define IT87_REG_CHIPID        0x58
192 
193 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
194 #define IN_FROM_REG(val) ((val) * 16)
195 
196 static inline u8 FAN_TO_REG(long rpm, int div)
197 {
198 	if (rpm == 0)
199 		return 255;
200 	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
201 	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
202 			     254);
203 }
204 
205 static inline u16 FAN16_TO_REG(long rpm)
206 {
207 	if (rpm == 0)
208 		return 0xffff;
209 	return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
210 }
211 
212 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
213 /* The divider is fixed to 2 in 16-bit mode */
214 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
215 
216 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
217 					((val)+500)/1000),-128,127))
218 #define TEMP_FROM_REG(val) ((val) * 1000)
219 
220 #define PWM_TO_REG(val)   ((val) >> 1)
221 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
222 
223 static int DIV_TO_REG(int val)
224 {
225 	int answer = 0;
226 	while (answer < 7 && (val >>= 1))
227 		answer++;
228 	return answer;
229 }
230 #define DIV_FROM_REG(val) (1 << (val))
231 
232 static const unsigned int pwm_freq[8] = {
233 	48000000 / 128,
234 	24000000 / 128,
235 	12000000 / 128,
236 	8000000 / 128,
237 	6000000 / 128,
238 	3000000 / 128,
239 	1500000 / 128,
240 	750000 / 128,
241 };
242 
243 
244 struct it87_sio_data {
245 	enum chips type;
246 	/* Values read from Super-I/O config space */
247 	u8 revision;
248 	u8 vid_value;
249 	/* Features skipped based on config or DMI */
250 	u8 skip_vid;
251 	u8 skip_fan;
252 	u8 skip_pwm;
253 };
254 
255 /* For each registered chip, we need to keep some data in memory.
256    The structure is dynamically allocated. */
257 struct it87_data {
258 	struct device *hwmon_dev;
259 	enum chips type;
260 	u8 revision;
261 
262 	unsigned short addr;
263 	const char *name;
264 	struct mutex update_lock;
265 	char valid;		/* !=0 if following fields are valid */
266 	unsigned long last_updated;	/* In jiffies */
267 
268 	u8 in[9];		/* Register value */
269 	u8 in_max[8];		/* Register value */
270 	u8 in_min[8];		/* Register value */
271 	u8 has_fan;		/* Bitfield, fans enabled */
272 	u16 fan[5];		/* Register values, possibly combined */
273 	u16 fan_min[5];		/* Register values, possibly combined */
274 	s8 temp[3];		/* Register value */
275 	s8 temp_high[3];	/* Register value */
276 	s8 temp_low[3];		/* Register value */
277 	u8 sensor;		/* Register value */
278 	u8 fan_div[3];		/* Register encoding, shifted right */
279 	u8 vid;			/* Register encoding, combined */
280 	u8 vrm;
281 	u32 alarms;		/* Register encoding, combined */
282 	u8 fan_main_ctrl;	/* Register value */
283 	u8 fan_ctl;		/* Register value */
284 	u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
285 };
286 
287 static inline int has_16bit_fans(const struct it87_data *data)
288 {
289 	/* IT8705F Datasheet 0.4.1, 3h == Version G.
290 	   IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
291 	   These are the first revisions with 16bit tachometer support. */
292 	return (data->type == it87 && data->revision >= 0x03)
293 	    || (data->type == it8712 && data->revision >= 0x08)
294 	    || data->type == it8716
295 	    || data->type == it8718
296 	    || data->type == it8720;
297 }
298 
299 static int it87_probe(struct platform_device *pdev);
300 static int __devexit it87_remove(struct platform_device *pdev);
301 
302 static int it87_read_value(struct it87_data *data, u8 reg);
303 static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
304 static struct it87_data *it87_update_device(struct device *dev);
305 static int it87_check_pwm(struct device *dev);
306 static void it87_init_device(struct platform_device *pdev);
307 
308 
309 static struct platform_driver it87_driver = {
310 	.driver = {
311 		.owner	= THIS_MODULE,
312 		.name	= DRVNAME,
313 	},
314 	.probe	= it87_probe,
315 	.remove	= __devexit_p(it87_remove),
316 };
317 
318 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
319 		char *buf)
320 {
321 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
322 	int nr = sensor_attr->index;
323 
324 	struct it87_data *data = it87_update_device(dev);
325 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
326 }
327 
328 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
329 		char *buf)
330 {
331 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
332 	int nr = sensor_attr->index;
333 
334 	struct it87_data *data = it87_update_device(dev);
335 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
336 }
337 
338 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
339 		char *buf)
340 {
341 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
342 	int nr = sensor_attr->index;
343 
344 	struct it87_data *data = it87_update_device(dev);
345 	return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
346 }
347 
348 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
349 		const char *buf, size_t count)
350 {
351 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
352 	int nr = sensor_attr->index;
353 
354 	struct it87_data *data = dev_get_drvdata(dev);
355 	unsigned long val = simple_strtoul(buf, NULL, 10);
356 
357 	mutex_lock(&data->update_lock);
358 	data->in_min[nr] = IN_TO_REG(val);
359 	it87_write_value(data, IT87_REG_VIN_MIN(nr),
360 			data->in_min[nr]);
361 	mutex_unlock(&data->update_lock);
362 	return count;
363 }
364 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
365 		const char *buf, size_t count)
366 {
367 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
368 	int nr = sensor_attr->index;
369 
370 	struct it87_data *data = dev_get_drvdata(dev);
371 	unsigned long val = simple_strtoul(buf, NULL, 10);
372 
373 	mutex_lock(&data->update_lock);
374 	data->in_max[nr] = IN_TO_REG(val);
375 	it87_write_value(data, IT87_REG_VIN_MAX(nr),
376 			data->in_max[nr]);
377 	mutex_unlock(&data->update_lock);
378 	return count;
379 }
380 
381 #define show_in_offset(offset)					\
382 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,		\
383 		show_in, NULL, offset);
384 
385 #define limit_in_offset(offset)					\
386 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,	\
387 		show_in_min, set_in_min, offset);		\
388 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,	\
389 		show_in_max, set_in_max, offset);
390 
391 show_in_offset(0);
392 limit_in_offset(0);
393 show_in_offset(1);
394 limit_in_offset(1);
395 show_in_offset(2);
396 limit_in_offset(2);
397 show_in_offset(3);
398 limit_in_offset(3);
399 show_in_offset(4);
400 limit_in_offset(4);
401 show_in_offset(5);
402 limit_in_offset(5);
403 show_in_offset(6);
404 limit_in_offset(6);
405 show_in_offset(7);
406 limit_in_offset(7);
407 show_in_offset(8);
408 
409 /* 3 temperatures */
410 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
411 		char *buf)
412 {
413 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
414 	int nr = sensor_attr->index;
415 
416 	struct it87_data *data = it87_update_device(dev);
417 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
418 }
419 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
420 		char *buf)
421 {
422 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
423 	int nr = sensor_attr->index;
424 
425 	struct it87_data *data = it87_update_device(dev);
426 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
427 }
428 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
429 		char *buf)
430 {
431 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
432 	int nr = sensor_attr->index;
433 
434 	struct it87_data *data = it87_update_device(dev);
435 	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
436 }
437 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
438 		const char *buf, size_t count)
439 {
440 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
441 	int nr = sensor_attr->index;
442 
443 	struct it87_data *data = dev_get_drvdata(dev);
444 	int val = simple_strtol(buf, NULL, 10);
445 
446 	mutex_lock(&data->update_lock);
447 	data->temp_high[nr] = TEMP_TO_REG(val);
448 	it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
449 	mutex_unlock(&data->update_lock);
450 	return count;
451 }
452 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
453 		const char *buf, size_t count)
454 {
455 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
456 	int nr = sensor_attr->index;
457 
458 	struct it87_data *data = dev_get_drvdata(dev);
459 	int val = simple_strtol(buf, NULL, 10);
460 
461 	mutex_lock(&data->update_lock);
462 	data->temp_low[nr] = TEMP_TO_REG(val);
463 	it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
464 	mutex_unlock(&data->update_lock);
465 	return count;
466 }
467 #define show_temp_offset(offset)					\
468 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,		\
469 		show_temp, NULL, offset - 1);				\
470 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,	\
471 		show_temp_max, set_temp_max, offset - 1);		\
472 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,	\
473 		show_temp_min, set_temp_min, offset - 1);
474 
475 show_temp_offset(1);
476 show_temp_offset(2);
477 show_temp_offset(3);
478 
479 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
480 		char *buf)
481 {
482 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
483 	int nr = sensor_attr->index;
484 
485 	struct it87_data *data = it87_update_device(dev);
486 	u8 reg = data->sensor; /* In case the value is updated while we use it */
487 
488 	if (reg & (1 << nr))
489 		return sprintf(buf, "3\n");  /* thermal diode */
490 	if (reg & (8 << nr))
491 		return sprintf(buf, "4\n");  /* thermistor */
492 	return sprintf(buf, "0\n");      /* disabled */
493 }
494 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
495 		const char *buf, size_t count)
496 {
497 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
498 	int nr = sensor_attr->index;
499 
500 	struct it87_data *data = dev_get_drvdata(dev);
501 	int val = simple_strtol(buf, NULL, 10);
502 
503 	mutex_lock(&data->update_lock);
504 
505 	data->sensor &= ~(1 << nr);
506 	data->sensor &= ~(8 << nr);
507 	if (val == 2) {	/* backwards compatibility */
508 		dev_warn(dev, "Sensor type 2 is deprecated, please use 4 "
509 			 "instead\n");
510 		val = 4;
511 	}
512 	/* 3 = thermal diode; 4 = thermistor; 0 = disabled */
513 	if (val == 3)
514 	    data->sensor |= 1 << nr;
515 	else if (val == 4)
516 	    data->sensor |= 8 << nr;
517 	else if (val != 0) {
518 		mutex_unlock(&data->update_lock);
519 		return -EINVAL;
520 	}
521 	it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
522 	mutex_unlock(&data->update_lock);
523 	return count;
524 }
525 #define show_sensor_offset(offset)					\
526 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,	\
527 		show_sensor, set_sensor, offset - 1);
528 
529 show_sensor_offset(1);
530 show_sensor_offset(2);
531 show_sensor_offset(3);
532 
533 /* 3 Fans */
534 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
535 		char *buf)
536 {
537 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
538 	int nr = sensor_attr->index;
539 
540 	struct it87_data *data = it87_update_device(dev);
541 	return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
542 				DIV_FROM_REG(data->fan_div[nr])));
543 }
544 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
545 		char *buf)
546 {
547 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
548 	int nr = sensor_attr->index;
549 
550 	struct it87_data *data = it87_update_device(dev);
551 	return sprintf(buf,"%d\n",
552 		FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
553 }
554 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
555 		char *buf)
556 {
557 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
558 	int nr = sensor_attr->index;
559 
560 	struct it87_data *data = it87_update_device(dev);
561 	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
562 }
563 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
564 		char *buf)
565 {
566 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
567 	int nr = sensor_attr->index;
568 
569 	struct it87_data *data = it87_update_device(dev);
570 	return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
571 }
572 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
573 		char *buf)
574 {
575 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
576 	int nr = sensor_attr->index;
577 
578 	struct it87_data *data = it87_update_device(dev);
579 	return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
580 }
581 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
582 		char *buf)
583 {
584 	struct it87_data *data = it87_update_device(dev);
585 	int index = (data->fan_ctl >> 4) & 0x07;
586 
587 	return sprintf(buf, "%u\n", pwm_freq[index]);
588 }
589 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
590 		const char *buf, size_t count)
591 {
592 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
593 	int nr = sensor_attr->index;
594 
595 	struct it87_data *data = dev_get_drvdata(dev);
596 	int val = simple_strtol(buf, NULL, 10);
597 	u8 reg;
598 
599 	mutex_lock(&data->update_lock);
600 	reg = it87_read_value(data, IT87_REG_FAN_DIV);
601 	switch (nr) {
602 	case 0: data->fan_div[nr] = reg & 0x07; break;
603 	case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
604 	case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
605 	}
606 
607 	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
608 	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
609 	mutex_unlock(&data->update_lock);
610 	return count;
611 }
612 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
613 		const char *buf, size_t count)
614 {
615 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
616 	int nr = sensor_attr->index;
617 
618 	struct it87_data *data = dev_get_drvdata(dev);
619 	unsigned long val = simple_strtoul(buf, NULL, 10);
620 	int min;
621 	u8 old;
622 
623 	mutex_lock(&data->update_lock);
624 	old = it87_read_value(data, IT87_REG_FAN_DIV);
625 
626 	/* Save fan min limit */
627 	min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
628 
629 	switch (nr) {
630 	case 0:
631 	case 1:
632 		data->fan_div[nr] = DIV_TO_REG(val);
633 		break;
634 	case 2:
635 		if (val < 8)
636 			data->fan_div[nr] = 1;
637 		else
638 			data->fan_div[nr] = 3;
639 	}
640 	val = old & 0x80;
641 	val |= (data->fan_div[0] & 0x07);
642 	val |= (data->fan_div[1] & 0x07) << 3;
643 	if (data->fan_div[2] == 3)
644 		val |= 0x1 << 6;
645 	it87_write_value(data, IT87_REG_FAN_DIV, val);
646 
647 	/* Restore fan min limit */
648 	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
649 	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
650 
651 	mutex_unlock(&data->update_lock);
652 	return count;
653 }
654 static ssize_t set_pwm_enable(struct device *dev,
655 		struct device_attribute *attr, const char *buf, size_t count)
656 {
657 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
658 	int nr = sensor_attr->index;
659 
660 	struct it87_data *data = dev_get_drvdata(dev);
661 	int val = simple_strtol(buf, NULL, 10);
662 
663 	mutex_lock(&data->update_lock);
664 
665 	if (val == 0) {
666 		int tmp;
667 		/* make sure the fan is on when in on/off mode */
668 		tmp = it87_read_value(data, IT87_REG_FAN_CTL);
669 		it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
670 		/* set on/off mode */
671 		data->fan_main_ctrl &= ~(1 << nr);
672 		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
673 	} else if (val == 1) {
674 		/* set SmartGuardian mode */
675 		data->fan_main_ctrl |= (1 << nr);
676 		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
677 		/* set saved pwm value, clear FAN_CTLX PWM mode bit */
678 		it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
679 	} else {
680 		mutex_unlock(&data->update_lock);
681 		return -EINVAL;
682 	}
683 
684 	mutex_unlock(&data->update_lock);
685 	return count;
686 }
687 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
688 		const char *buf, size_t count)
689 {
690 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
691 	int nr = sensor_attr->index;
692 
693 	struct it87_data *data = dev_get_drvdata(dev);
694 	int val = simple_strtol(buf, NULL, 10);
695 
696 	if (val < 0 || val > 255)
697 		return -EINVAL;
698 
699 	mutex_lock(&data->update_lock);
700 	data->manual_pwm_ctl[nr] = val;
701 	if (data->fan_main_ctrl & (1 << nr))
702 		it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
703 	mutex_unlock(&data->update_lock);
704 	return count;
705 }
706 static ssize_t set_pwm_freq(struct device *dev,
707 		struct device_attribute *attr, const char *buf, size_t count)
708 {
709 	struct it87_data *data = dev_get_drvdata(dev);
710 	unsigned long val = simple_strtoul(buf, NULL, 10);
711 	int i;
712 
713 	/* Search for the nearest available frequency */
714 	for (i = 0; i < 7; i++) {
715 		if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
716 			break;
717 	}
718 
719 	mutex_lock(&data->update_lock);
720 	data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
721 	data->fan_ctl |= i << 4;
722 	it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
723 	mutex_unlock(&data->update_lock);
724 
725 	return count;
726 }
727 
728 #define show_fan_offset(offset)					\
729 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,		\
730 		show_fan, NULL, offset - 1);			\
731 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
732 		show_fan_min, set_fan_min, offset - 1);		\
733 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
734 		show_fan_div, set_fan_div, offset - 1);
735 
736 show_fan_offset(1);
737 show_fan_offset(2);
738 show_fan_offset(3);
739 
740 #define show_pwm_offset(offset)						\
741 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,	\
742 		show_pwm_enable, set_pwm_enable, offset - 1);		\
743 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,		\
744 		show_pwm, set_pwm, offset - 1);				\
745 static DEVICE_ATTR(pwm##offset##_freq,					\
746 		(offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),		\
747 		show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
748 
749 show_pwm_offset(1);
750 show_pwm_offset(2);
751 show_pwm_offset(3);
752 
753 /* A different set of callbacks for 16-bit fans */
754 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
755 		char *buf)
756 {
757 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
758 	int nr = sensor_attr->index;
759 	struct it87_data *data = it87_update_device(dev);
760 	return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
761 }
762 
763 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
764 		char *buf)
765 {
766 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
767 	int nr = sensor_attr->index;
768 	struct it87_data *data = it87_update_device(dev);
769 	return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
770 }
771 
772 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
773 		const char *buf, size_t count)
774 {
775 	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
776 	int nr = sensor_attr->index;
777 	struct it87_data *data = dev_get_drvdata(dev);
778 	int val = simple_strtol(buf, NULL, 10);
779 
780 	mutex_lock(&data->update_lock);
781 	data->fan_min[nr] = FAN16_TO_REG(val);
782 	it87_write_value(data, IT87_REG_FAN_MIN[nr],
783 			 data->fan_min[nr] & 0xff);
784 	it87_write_value(data, IT87_REG_FANX_MIN[nr],
785 			 data->fan_min[nr] >> 8);
786 	mutex_unlock(&data->update_lock);
787 	return count;
788 }
789 
790 /* We want to use the same sysfs file names as 8-bit fans, but we need
791    different variable names, so we have to use SENSOR_ATTR instead of
792    SENSOR_DEVICE_ATTR. */
793 #define show_fan16_offset(offset) \
794 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
795 	= SENSOR_ATTR(fan##offset##_input, S_IRUGO,		\
796 		show_fan16, NULL, offset - 1);			\
797 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
798 	= SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,	\
799 		show_fan16_min, set_fan16_min, offset - 1)
800 
801 show_fan16_offset(1);
802 show_fan16_offset(2);
803 show_fan16_offset(3);
804 show_fan16_offset(4);
805 show_fan16_offset(5);
806 
807 /* Alarms */
808 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
809 {
810 	struct it87_data *data = it87_update_device(dev);
811 	return sprintf(buf, "%u\n", data->alarms);
812 }
813 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
814 
815 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
816 		char *buf)
817 {
818 	int bitnr = to_sensor_dev_attr(attr)->index;
819 	struct it87_data *data = it87_update_device(dev);
820 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
821 }
822 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
823 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
824 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
825 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
826 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
827 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
828 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
829 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
830 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
831 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
832 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
833 static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
834 static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
835 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
836 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
837 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
838 
839 static ssize_t
840 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
841 {
842 	struct it87_data *data = dev_get_drvdata(dev);
843 	return sprintf(buf, "%u\n", data->vrm);
844 }
845 static ssize_t
846 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
847 {
848 	struct it87_data *data = dev_get_drvdata(dev);
849 	u32 val;
850 
851 	val = simple_strtoul(buf, NULL, 10);
852 	data->vrm = val;
853 
854 	return count;
855 }
856 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
857 
858 static ssize_t
859 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
860 {
861 	struct it87_data *data = it87_update_device(dev);
862 	return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
863 }
864 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
865 
866 static ssize_t show_name(struct device *dev, struct device_attribute
867 			 *devattr, char *buf)
868 {
869 	struct it87_data *data = dev_get_drvdata(dev);
870 	return sprintf(buf, "%s\n", data->name);
871 }
872 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
873 
874 static struct attribute *it87_attributes[] = {
875 	&sensor_dev_attr_in0_input.dev_attr.attr,
876 	&sensor_dev_attr_in1_input.dev_attr.attr,
877 	&sensor_dev_attr_in2_input.dev_attr.attr,
878 	&sensor_dev_attr_in3_input.dev_attr.attr,
879 	&sensor_dev_attr_in4_input.dev_attr.attr,
880 	&sensor_dev_attr_in5_input.dev_attr.attr,
881 	&sensor_dev_attr_in6_input.dev_attr.attr,
882 	&sensor_dev_attr_in7_input.dev_attr.attr,
883 	&sensor_dev_attr_in8_input.dev_attr.attr,
884 	&sensor_dev_attr_in0_min.dev_attr.attr,
885 	&sensor_dev_attr_in1_min.dev_attr.attr,
886 	&sensor_dev_attr_in2_min.dev_attr.attr,
887 	&sensor_dev_attr_in3_min.dev_attr.attr,
888 	&sensor_dev_attr_in4_min.dev_attr.attr,
889 	&sensor_dev_attr_in5_min.dev_attr.attr,
890 	&sensor_dev_attr_in6_min.dev_attr.attr,
891 	&sensor_dev_attr_in7_min.dev_attr.attr,
892 	&sensor_dev_attr_in0_max.dev_attr.attr,
893 	&sensor_dev_attr_in1_max.dev_attr.attr,
894 	&sensor_dev_attr_in2_max.dev_attr.attr,
895 	&sensor_dev_attr_in3_max.dev_attr.attr,
896 	&sensor_dev_attr_in4_max.dev_attr.attr,
897 	&sensor_dev_attr_in5_max.dev_attr.attr,
898 	&sensor_dev_attr_in6_max.dev_attr.attr,
899 	&sensor_dev_attr_in7_max.dev_attr.attr,
900 	&sensor_dev_attr_in0_alarm.dev_attr.attr,
901 	&sensor_dev_attr_in1_alarm.dev_attr.attr,
902 	&sensor_dev_attr_in2_alarm.dev_attr.attr,
903 	&sensor_dev_attr_in3_alarm.dev_attr.attr,
904 	&sensor_dev_attr_in4_alarm.dev_attr.attr,
905 	&sensor_dev_attr_in5_alarm.dev_attr.attr,
906 	&sensor_dev_attr_in6_alarm.dev_attr.attr,
907 	&sensor_dev_attr_in7_alarm.dev_attr.attr,
908 
909 	&sensor_dev_attr_temp1_input.dev_attr.attr,
910 	&sensor_dev_attr_temp2_input.dev_attr.attr,
911 	&sensor_dev_attr_temp3_input.dev_attr.attr,
912 	&sensor_dev_attr_temp1_max.dev_attr.attr,
913 	&sensor_dev_attr_temp2_max.dev_attr.attr,
914 	&sensor_dev_attr_temp3_max.dev_attr.attr,
915 	&sensor_dev_attr_temp1_min.dev_attr.attr,
916 	&sensor_dev_attr_temp2_min.dev_attr.attr,
917 	&sensor_dev_attr_temp3_min.dev_attr.attr,
918 	&sensor_dev_attr_temp1_type.dev_attr.attr,
919 	&sensor_dev_attr_temp2_type.dev_attr.attr,
920 	&sensor_dev_attr_temp3_type.dev_attr.attr,
921 	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
922 	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
923 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
924 
925 	&dev_attr_alarms.attr,
926 	&dev_attr_name.attr,
927 	NULL
928 };
929 
930 static const struct attribute_group it87_group = {
931 	.attrs = it87_attributes,
932 };
933 
934 static struct attribute *it87_attributes_opt[] = {
935 	&sensor_dev_attr_fan1_input16.dev_attr.attr,
936 	&sensor_dev_attr_fan1_min16.dev_attr.attr,
937 	&sensor_dev_attr_fan2_input16.dev_attr.attr,
938 	&sensor_dev_attr_fan2_min16.dev_attr.attr,
939 	&sensor_dev_attr_fan3_input16.dev_attr.attr,
940 	&sensor_dev_attr_fan3_min16.dev_attr.attr,
941 	&sensor_dev_attr_fan4_input16.dev_attr.attr,
942 	&sensor_dev_attr_fan4_min16.dev_attr.attr,
943 	&sensor_dev_attr_fan5_input16.dev_attr.attr,
944 	&sensor_dev_attr_fan5_min16.dev_attr.attr,
945 
946 	&sensor_dev_attr_fan1_input.dev_attr.attr,
947 	&sensor_dev_attr_fan1_min.dev_attr.attr,
948 	&sensor_dev_attr_fan1_div.dev_attr.attr,
949 	&sensor_dev_attr_fan2_input.dev_attr.attr,
950 	&sensor_dev_attr_fan2_min.dev_attr.attr,
951 	&sensor_dev_attr_fan2_div.dev_attr.attr,
952 	&sensor_dev_attr_fan3_input.dev_attr.attr,
953 	&sensor_dev_attr_fan3_min.dev_attr.attr,
954 	&sensor_dev_attr_fan3_div.dev_attr.attr,
955 
956 	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
957 	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
958 	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
959 	&sensor_dev_attr_fan4_alarm.dev_attr.attr,
960 	&sensor_dev_attr_fan5_alarm.dev_attr.attr,
961 
962 	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
963 	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
964 	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
965 	&sensor_dev_attr_pwm1.dev_attr.attr,
966 	&sensor_dev_attr_pwm2.dev_attr.attr,
967 	&sensor_dev_attr_pwm3.dev_attr.attr,
968 	&dev_attr_pwm1_freq.attr,
969 	&dev_attr_pwm2_freq.attr,
970 	&dev_attr_pwm3_freq.attr,
971 
972 	&dev_attr_vrm.attr,
973 	&dev_attr_cpu0_vid.attr,
974 	NULL
975 };
976 
977 static const struct attribute_group it87_group_opt = {
978 	.attrs = it87_attributes_opt,
979 };
980 
981 /* SuperIO detection - will change isa_address if a chip is found */
982 static int __init it87_find(unsigned short *address,
983 	struct it87_sio_data *sio_data)
984 {
985 	int err = -ENODEV;
986 	u16 chip_type;
987 	const char *board_vendor, *board_name;
988 
989 	superio_enter();
990 	chip_type = force_id ? force_id : superio_inw(DEVID);
991 
992 	switch (chip_type) {
993 	case IT8705F_DEVID:
994 		sio_data->type = it87;
995 		break;
996 	case IT8712F_DEVID:
997 		sio_data->type = it8712;
998 		break;
999 	case IT8716F_DEVID:
1000 	case IT8726F_DEVID:
1001 		sio_data->type = it8716;
1002 		break;
1003 	case IT8718F_DEVID:
1004 		sio_data->type = it8718;
1005 		break;
1006 	case IT8720F_DEVID:
1007 		sio_data->type = it8720;
1008 		break;
1009 	case 0xffff:	/* No device at all */
1010 		goto exit;
1011 	default:
1012 		pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n",
1013 			 chip_type);
1014 		goto exit;
1015 	}
1016 
1017 	superio_select(PME);
1018 	if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
1019 		pr_info("it87: Device not activated, skipping\n");
1020 		goto exit;
1021 	}
1022 
1023 	*address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
1024 	if (*address == 0) {
1025 		pr_info("it87: Base address not set, skipping\n");
1026 		goto exit;
1027 	}
1028 
1029 	err = 0;
1030 	sio_data->revision = superio_inb(DEVREV) & 0x0f;
1031 	pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
1032 		chip_type, *address, sio_data->revision);
1033 
1034 	/* Read GPIO config and VID value from LDN 7 (GPIO) */
1035 	if (sio_data->type == it87) {
1036 		/* The IT8705F doesn't have VID pins at all */
1037 		sio_data->skip_vid = 1;
1038 	} else {
1039 		int reg;
1040 
1041 		superio_select(GPIO);
1042 		/* We need at least 4 VID pins */
1043 		reg = superio_inb(IT87_SIO_GPIO3_REG);
1044 		if (reg & 0x0f) {
1045 			pr_info("it87: VID is disabled (pins used for GPIO)\n");
1046 			sio_data->skip_vid = 1;
1047 		}
1048 
1049 		/* Check if fan3 is there or not */
1050 		if (reg & (1 << 6))
1051 			sio_data->skip_pwm |= (1 << 2);
1052 		if (reg & (1 << 7))
1053 			sio_data->skip_fan |= (1 << 2);
1054 
1055 		/* Check if fan2 is there or not */
1056 		reg = superio_inb(IT87_SIO_GPIO5_REG);
1057 		if (reg & (1 << 1))
1058 			sio_data->skip_pwm |= (1 << 1);
1059 		if (reg & (1 << 2))
1060 			sio_data->skip_fan |= (1 << 1);
1061 
1062 		if ((sio_data->type == it8718 || sio_data->type == it8720)
1063 		 && !(sio_data->skip_vid))
1064 			sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
1065 
1066 		reg = superio_inb(IT87_SIO_PINX2_REG);
1067 		if (reg & (1 << 0))
1068 			pr_info("it87: in3 is VCC (+5V)\n");
1069 		if (reg & (1 << 1))
1070 			pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
1071 	}
1072 
1073 	/* Disable specific features based on DMI strings */
1074 	board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
1075 	board_name = dmi_get_system_info(DMI_BOARD_NAME);
1076 	if (board_vendor && board_name) {
1077 		if (strcmp(board_vendor, "nVIDIA") == 0
1078 		 && strcmp(board_name, "FN68PT") == 0) {
1079 			/* On the Shuttle SN68PT, FAN_CTL2 is apparently not
1080 			   connected to a fan, but to something else. One user
1081 			   has reported instant system power-off when changing
1082 			   the PWM2 duty cycle, so we disable it.
1083 			   I use the board name string as the trigger in case
1084 			   the same board is ever used in other systems. */
1085 			pr_info("it87: Disabling pwm2 due to "
1086 				"hardware constraints\n");
1087 			sio_data->skip_pwm = (1 << 1);
1088 		}
1089 	}
1090 
1091 exit:
1092 	superio_exit();
1093 	return err;
1094 }
1095 
1096 static int __devinit it87_probe(struct platform_device *pdev)
1097 {
1098 	struct it87_data *data;
1099 	struct resource *res;
1100 	struct device *dev = &pdev->dev;
1101 	struct it87_sio_data *sio_data = dev->platform_data;
1102 	int err = 0;
1103 	int enable_pwm_interface;
1104 	static const char *names[] = {
1105 		"it87",
1106 		"it8712",
1107 		"it8716",
1108 		"it8718",
1109 		"it8720",
1110 	};
1111 
1112 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1113 	if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) {
1114 		dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
1115 			(unsigned long)res->start,
1116 			(unsigned long)(res->start + IT87_EC_EXTENT - 1));
1117 		err = -EBUSY;
1118 		goto ERROR0;
1119 	}
1120 
1121 	if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
1122 		err = -ENOMEM;
1123 		goto ERROR1;
1124 	}
1125 
1126 	data->addr = res->start;
1127 	data->type = sio_data->type;
1128 	data->revision = sio_data->revision;
1129 	data->name = names[sio_data->type];
1130 
1131 	/* Now, we do the remaining detection. */
1132 	if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
1133 	 || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {
1134 		err = -ENODEV;
1135 		goto ERROR2;
1136 	}
1137 
1138 	platform_set_drvdata(pdev, data);
1139 
1140 	mutex_init(&data->update_lock);
1141 
1142 	/* Check PWM configuration */
1143 	enable_pwm_interface = it87_check_pwm(dev);
1144 
1145 	/* Initialize the IT87 chip */
1146 	it87_init_device(pdev);
1147 
1148 	/* Register sysfs hooks */
1149 	if ((err = sysfs_create_group(&dev->kobj, &it87_group)))
1150 		goto ERROR2;
1151 
1152 	/* Do not create fan files for disabled fans */
1153 	if (has_16bit_fans(data)) {
1154 		/* 16-bit tachometers */
1155 		if (data->has_fan & (1 << 0)) {
1156 			if ((err = device_create_file(dev,
1157 			     &sensor_dev_attr_fan1_input16.dev_attr))
1158 			 || (err = device_create_file(dev,
1159 			     &sensor_dev_attr_fan1_min16.dev_attr))
1160 			 || (err = device_create_file(dev,
1161 			     &sensor_dev_attr_fan1_alarm.dev_attr)))
1162 				goto ERROR4;
1163 		}
1164 		if (data->has_fan & (1 << 1)) {
1165 			if ((err = device_create_file(dev,
1166 			     &sensor_dev_attr_fan2_input16.dev_attr))
1167 			 || (err = device_create_file(dev,
1168 			     &sensor_dev_attr_fan2_min16.dev_attr))
1169 			 || (err = device_create_file(dev,
1170 			     &sensor_dev_attr_fan2_alarm.dev_attr)))
1171 				goto ERROR4;
1172 		}
1173 		if (data->has_fan & (1 << 2)) {
1174 			if ((err = device_create_file(dev,
1175 			     &sensor_dev_attr_fan3_input16.dev_attr))
1176 			 || (err = device_create_file(dev,
1177 			     &sensor_dev_attr_fan3_min16.dev_attr))
1178 			 || (err = device_create_file(dev,
1179 			     &sensor_dev_attr_fan3_alarm.dev_attr)))
1180 				goto ERROR4;
1181 		}
1182 		if (data->has_fan & (1 << 3)) {
1183 			if ((err = device_create_file(dev,
1184 			     &sensor_dev_attr_fan4_input16.dev_attr))
1185 			 || (err = device_create_file(dev,
1186 			     &sensor_dev_attr_fan4_min16.dev_attr))
1187 			 || (err = device_create_file(dev,
1188 			     &sensor_dev_attr_fan4_alarm.dev_attr)))
1189 				goto ERROR4;
1190 		}
1191 		if (data->has_fan & (1 << 4)) {
1192 			if ((err = device_create_file(dev,
1193 			     &sensor_dev_attr_fan5_input16.dev_attr))
1194 			 || (err = device_create_file(dev,
1195 			     &sensor_dev_attr_fan5_min16.dev_attr))
1196 			 || (err = device_create_file(dev,
1197 			     &sensor_dev_attr_fan5_alarm.dev_attr)))
1198 				goto ERROR4;
1199 		}
1200 	} else {
1201 		/* 8-bit tachometers with clock divider */
1202 		if (data->has_fan & (1 << 0)) {
1203 			if ((err = device_create_file(dev,
1204 			     &sensor_dev_attr_fan1_input.dev_attr))
1205 			 || (err = device_create_file(dev,
1206 			     &sensor_dev_attr_fan1_min.dev_attr))
1207 			 || (err = device_create_file(dev,
1208 			     &sensor_dev_attr_fan1_div.dev_attr))
1209 			 || (err = device_create_file(dev,
1210 			     &sensor_dev_attr_fan1_alarm.dev_attr)))
1211 				goto ERROR4;
1212 		}
1213 		if (data->has_fan & (1 << 1)) {
1214 			if ((err = device_create_file(dev,
1215 			     &sensor_dev_attr_fan2_input.dev_attr))
1216 			 || (err = device_create_file(dev,
1217 			     &sensor_dev_attr_fan2_min.dev_attr))
1218 			 || (err = device_create_file(dev,
1219 			     &sensor_dev_attr_fan2_div.dev_attr))
1220 			 || (err = device_create_file(dev,
1221 			     &sensor_dev_attr_fan2_alarm.dev_attr)))
1222 				goto ERROR4;
1223 		}
1224 		if (data->has_fan & (1 << 2)) {
1225 			if ((err = device_create_file(dev,
1226 			     &sensor_dev_attr_fan3_input.dev_attr))
1227 			 || (err = device_create_file(dev,
1228 			     &sensor_dev_attr_fan3_min.dev_attr))
1229 			 || (err = device_create_file(dev,
1230 			     &sensor_dev_attr_fan3_div.dev_attr))
1231 			 || (err = device_create_file(dev,
1232 			     &sensor_dev_attr_fan3_alarm.dev_attr)))
1233 				goto ERROR4;
1234 		}
1235 	}
1236 
1237 	if (enable_pwm_interface) {
1238 		if (!(sio_data->skip_pwm & (1 << 0))) {
1239 			if ((err = device_create_file(dev,
1240 			     &sensor_dev_attr_pwm1_enable.dev_attr))
1241 			 || (err = device_create_file(dev,
1242 			     &sensor_dev_attr_pwm1.dev_attr))
1243 			 || (err = device_create_file(dev,
1244 			     &dev_attr_pwm1_freq)))
1245 				goto ERROR4;
1246 		}
1247 		if (!(sio_data->skip_pwm & (1 << 1))) {
1248 			if ((err = device_create_file(dev,
1249 			     &sensor_dev_attr_pwm2_enable.dev_attr))
1250 			 || (err = device_create_file(dev,
1251 			     &sensor_dev_attr_pwm2.dev_attr))
1252 			 || (err = device_create_file(dev,
1253 			     &dev_attr_pwm2_freq)))
1254 				goto ERROR4;
1255 		}
1256 		if (!(sio_data->skip_pwm & (1 << 2))) {
1257 			if ((err = device_create_file(dev,
1258 			     &sensor_dev_attr_pwm3_enable.dev_attr))
1259 			 || (err = device_create_file(dev,
1260 			     &sensor_dev_attr_pwm3.dev_attr))
1261 			 || (err = device_create_file(dev,
1262 			     &dev_attr_pwm3_freq)))
1263 				goto ERROR4;
1264 		}
1265 	}
1266 
1267 	if (!sio_data->skip_vid) {
1268 		data->vrm = vid_which_vrm();
1269 		/* VID reading from Super-I/O config space if available */
1270 		data->vid = sio_data->vid_value;
1271 		if ((err = device_create_file(dev,
1272 		     &dev_attr_vrm))
1273 		 || (err = device_create_file(dev,
1274 		     &dev_attr_cpu0_vid)))
1275 			goto ERROR4;
1276 	}
1277 
1278 	data->hwmon_dev = hwmon_device_register(dev);
1279 	if (IS_ERR(data->hwmon_dev)) {
1280 		err = PTR_ERR(data->hwmon_dev);
1281 		goto ERROR4;
1282 	}
1283 
1284 	return 0;
1285 
1286 ERROR4:
1287 	sysfs_remove_group(&dev->kobj, &it87_group);
1288 	sysfs_remove_group(&dev->kobj, &it87_group_opt);
1289 ERROR2:
1290 	platform_set_drvdata(pdev, NULL);
1291 	kfree(data);
1292 ERROR1:
1293 	release_region(res->start, IT87_EC_EXTENT);
1294 ERROR0:
1295 	return err;
1296 }
1297 
1298 static int __devexit it87_remove(struct platform_device *pdev)
1299 {
1300 	struct it87_data *data = platform_get_drvdata(pdev);
1301 
1302 	hwmon_device_unregister(data->hwmon_dev);
1303 	sysfs_remove_group(&pdev->dev.kobj, &it87_group);
1304 	sysfs_remove_group(&pdev->dev.kobj, &it87_group_opt);
1305 
1306 	release_region(data->addr, IT87_EC_EXTENT);
1307 	platform_set_drvdata(pdev, NULL);
1308 	kfree(data);
1309 
1310 	return 0;
1311 }
1312 
1313 /* Must be called with data->update_lock held, except during initialization.
1314    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1315    would slow down the IT87 access and should not be necessary. */
1316 static int it87_read_value(struct it87_data *data, u8 reg)
1317 {
1318 	outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1319 	return inb_p(data->addr + IT87_DATA_REG_OFFSET);
1320 }
1321 
1322 /* Must be called with data->update_lock held, except during initialization.
1323    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1324    would slow down the IT87 access and should not be necessary. */
1325 static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
1326 {
1327 	outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1328 	outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
1329 }
1330 
1331 /* Return 1 if and only if the PWM interface is safe to use */
1332 static int __devinit it87_check_pwm(struct device *dev)
1333 {
1334 	struct it87_data *data = dev_get_drvdata(dev);
1335 	/* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1336 	 * and polarity set to active low is sign that this is the case so we
1337 	 * disable pwm control to protect the user. */
1338 	int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
1339 	if ((tmp & 0x87) == 0) {
1340 		if (fix_pwm_polarity) {
1341 			/* The user asks us to attempt a chip reconfiguration.
1342 			 * This means switching to active high polarity and
1343 			 * inverting all fan speed values. */
1344 			int i;
1345 			u8 pwm[3];
1346 
1347 			for (i = 0; i < 3; i++)
1348 				pwm[i] = it87_read_value(data,
1349 							 IT87_REG_PWM(i));
1350 
1351 			/* If any fan is in automatic pwm mode, the polarity
1352 			 * might be correct, as suspicious as it seems, so we
1353 			 * better don't change anything (but still disable the
1354 			 * PWM interface). */
1355 			if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1356 				dev_info(dev, "Reconfiguring PWM to "
1357 					 "active high polarity\n");
1358 				it87_write_value(data, IT87_REG_FAN_CTL,
1359 						 tmp | 0x87);
1360 				for (i = 0; i < 3; i++)
1361 					it87_write_value(data,
1362 							 IT87_REG_PWM(i),
1363 							 0x7f & ~pwm[i]);
1364 				return 1;
1365 			}
1366 
1367 			dev_info(dev, "PWM configuration is "
1368 				 "too broken to be fixed\n");
1369 		}
1370 
1371 		dev_info(dev, "Detected broken BIOS "
1372 			 "defaults, disabling PWM interface\n");
1373 		return 0;
1374 	} else if (fix_pwm_polarity) {
1375 		dev_info(dev, "PWM configuration looks "
1376 			 "sane, won't touch\n");
1377 	}
1378 
1379 	return 1;
1380 }
1381 
1382 /* Called when we have found a new IT87. */
1383 static void __devinit it87_init_device(struct platform_device *pdev)
1384 {
1385 	struct it87_sio_data *sio_data = pdev->dev.platform_data;
1386 	struct it87_data *data = platform_get_drvdata(pdev);
1387 	int tmp, i;
1388 	u8 mask;
1389 
1390 	/* initialize to sane defaults:
1391 	 * - if the chip is in manual pwm mode, this will be overwritten with
1392 	 *   the actual settings on the chip (so in this case, initialization
1393 	 *   is not needed)
1394 	 * - if in automatic or on/off mode, we could switch to manual mode,
1395 	 *   read the registers and set manual_pwm_ctl accordingly, but currently
1396 	 *   this is not implemented, so we initialize to something sane */
1397 	for (i = 0; i < 3; i++) {
1398 		data->manual_pwm_ctl[i] = 0xff;
1399 	}
1400 
1401 	/* Some chips seem to have default value 0xff for all limit
1402 	 * registers. For low voltage limits it makes no sense and triggers
1403 	 * alarms, so change to 0 instead. For high temperature limits, it
1404 	 * means -1 degree C, which surprisingly doesn't trigger an alarm,
1405 	 * but is still confusing, so change to 127 degrees C. */
1406 	for (i = 0; i < 8; i++) {
1407 		tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
1408 		if (tmp == 0xff)
1409 			it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
1410 	}
1411 	for (i = 0; i < 3; i++) {
1412 		tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1413 		if (tmp == 0xff)
1414 			it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
1415 	}
1416 
1417 	/* Check if temperature channels are reset manually or by some reason */
1418 	tmp = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1419 	if ((tmp & 0x3f) == 0) {
1420 		/* Temp1,Temp3=thermistor; Temp2=thermal diode */
1421 		tmp = (tmp & 0xc0) | 0x2a;
1422 		it87_write_value(data, IT87_REG_TEMP_ENABLE, tmp);
1423 	}
1424 	data->sensor = tmp;
1425 
1426 	/* Check if voltage monitors are reset manually or by some reason */
1427 	tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
1428 	if ((tmp & 0xff) == 0) {
1429 		/* Enable all voltage monitors */
1430 		it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
1431 	}
1432 
1433 	/* Check if tachometers are reset manually or by some reason */
1434 	mask = 0x70 & ~(sio_data->skip_fan << 4);
1435 	data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
1436 	if ((data->fan_main_ctrl & mask) == 0) {
1437 		/* Enable all fan tachometers */
1438 		data->fan_main_ctrl |= mask;
1439 		it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1440 	}
1441 	data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1442 
1443 	/* Set tachometers to 16-bit mode if needed */
1444 	if (has_16bit_fans(data)) {
1445 		tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
1446 		if (~tmp & 0x07 & data->has_fan) {
1447 			dev_dbg(&pdev->dev,
1448 				"Setting fan1-3 to 16-bit mode\n");
1449 			it87_write_value(data, IT87_REG_FAN_16BIT,
1450 					 tmp | 0x07);
1451 		}
1452 		/* IT8705F only supports three fans. */
1453 		if (data->type != it87) {
1454 			if (tmp & (1 << 4))
1455 				data->has_fan |= (1 << 3); /* fan4 enabled */
1456 			if (tmp & (1 << 5))
1457 				data->has_fan |= (1 << 4); /* fan5 enabled */
1458 		}
1459 	}
1460 
1461 	/* Fan input pins may be used for alternative functions */
1462 	data->has_fan &= ~sio_data->skip_fan;
1463 
1464 	/* Set current fan mode registers and the default settings for the
1465 	 * other mode registers */
1466 	for (i = 0; i < 3; i++) {
1467 		if (data->fan_main_ctrl & (1 << i)) {
1468 			/* pwm mode */
1469 			tmp = it87_read_value(data, IT87_REG_PWM(i));
1470 			if (tmp & 0x80) {
1471 				/* automatic pwm - not yet implemented, but
1472 				 * leave the settings made by the BIOS alone
1473 				 * until a change is requested via the sysfs
1474 				 * interface */
1475 			} else {
1476 				/* manual pwm */
1477 				data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1478 			}
1479 		}
1480  	}
1481 
1482 	/* Start monitoring */
1483 	it87_write_value(data, IT87_REG_CONFIG,
1484 			 (it87_read_value(data, IT87_REG_CONFIG) & 0x36)
1485 			 | (update_vbat ? 0x41 : 0x01));
1486 }
1487 
1488 static struct it87_data *it87_update_device(struct device *dev)
1489 {
1490 	struct it87_data *data = dev_get_drvdata(dev);
1491 	int i;
1492 
1493 	mutex_lock(&data->update_lock);
1494 
1495 	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1496 	    || !data->valid) {
1497 
1498 		if (update_vbat) {
1499 			/* Cleared after each update, so reenable.  Value
1500 		 	  returned by this read will be previous value */
1501 			it87_write_value(data, IT87_REG_CONFIG,
1502 			   it87_read_value(data, IT87_REG_CONFIG) | 0x40);
1503 		}
1504 		for (i = 0; i <= 7; i++) {
1505 			data->in[i] =
1506 			    it87_read_value(data, IT87_REG_VIN(i));
1507 			data->in_min[i] =
1508 			    it87_read_value(data, IT87_REG_VIN_MIN(i));
1509 			data->in_max[i] =
1510 			    it87_read_value(data, IT87_REG_VIN_MAX(i));
1511 		}
1512 		/* in8 (battery) has no limit registers */
1513 		data->in[8] =
1514 		    it87_read_value(data, IT87_REG_VIN(8));
1515 
1516 		for (i = 0; i < 5; i++) {
1517 			/* Skip disabled fans */
1518 			if (!(data->has_fan & (1 << i)))
1519 				continue;
1520 
1521 			data->fan_min[i] =
1522 			    it87_read_value(data, IT87_REG_FAN_MIN[i]);
1523 			data->fan[i] = it87_read_value(data,
1524 				       IT87_REG_FAN[i]);
1525 			/* Add high byte if in 16-bit mode */
1526 			if (has_16bit_fans(data)) {
1527 				data->fan[i] |= it87_read_value(data,
1528 						IT87_REG_FANX[i]) << 8;
1529 				data->fan_min[i] |= it87_read_value(data,
1530 						IT87_REG_FANX_MIN[i]) << 8;
1531 			}
1532 		}
1533 		for (i = 0; i < 3; i++) {
1534 			data->temp[i] =
1535 			    it87_read_value(data, IT87_REG_TEMP(i));
1536 			data->temp_high[i] =
1537 			    it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1538 			data->temp_low[i] =
1539 			    it87_read_value(data, IT87_REG_TEMP_LOW(i));
1540 		}
1541 
1542 		/* Newer chips don't have clock dividers */
1543 		if ((data->has_fan & 0x07) && !has_16bit_fans(data)) {
1544 			i = it87_read_value(data, IT87_REG_FAN_DIV);
1545 			data->fan_div[0] = i & 0x07;
1546 			data->fan_div[1] = (i >> 3) & 0x07;
1547 			data->fan_div[2] = (i & 0x40) ? 3 : 1;
1548 		}
1549 
1550 		data->alarms =
1551 			it87_read_value(data, IT87_REG_ALARM1) |
1552 			(it87_read_value(data, IT87_REG_ALARM2) << 8) |
1553 			(it87_read_value(data, IT87_REG_ALARM3) << 16);
1554 		data->fan_main_ctrl = it87_read_value(data,
1555 				IT87_REG_FAN_MAIN_CTRL);
1556 		data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
1557 
1558 		data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1559 		/* The 8705 does not have VID capability.
1560 		   The 8718 and the 8720 don't use IT87_REG_VID for the
1561 		   same purpose. */
1562 		if (data->type == it8712 || data->type == it8716) {
1563 			data->vid = it87_read_value(data, IT87_REG_VID);
1564 			/* The older IT8712F revisions had only 5 VID pins,
1565 			   but we assume it is always safe to read 6 bits. */
1566 			data->vid &= 0x3f;
1567 		}
1568 		data->last_updated = jiffies;
1569 		data->valid = 1;
1570 	}
1571 
1572 	mutex_unlock(&data->update_lock);
1573 
1574 	return data;
1575 }
1576 
1577 static int __init it87_device_add(unsigned short address,
1578 				  const struct it87_sio_data *sio_data)
1579 {
1580 	struct resource res = {
1581 		.start	= address + IT87_EC_OFFSET,
1582 		.end	= address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
1583 		.name	= DRVNAME,
1584 		.flags	= IORESOURCE_IO,
1585 	};
1586 	int err;
1587 
1588 	err = acpi_check_resource_conflict(&res);
1589 	if (err)
1590 		goto exit;
1591 
1592 	pdev = platform_device_alloc(DRVNAME, address);
1593 	if (!pdev) {
1594 		err = -ENOMEM;
1595 		printk(KERN_ERR DRVNAME ": Device allocation failed\n");
1596 		goto exit;
1597 	}
1598 
1599 	err = platform_device_add_resources(pdev, &res, 1);
1600 	if (err) {
1601 		printk(KERN_ERR DRVNAME ": Device resource addition failed "
1602 		       "(%d)\n", err);
1603 		goto exit_device_put;
1604 	}
1605 
1606 	err = platform_device_add_data(pdev, sio_data,
1607 				       sizeof(struct it87_sio_data));
1608 	if (err) {
1609 		printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
1610 		goto exit_device_put;
1611 	}
1612 
1613 	err = platform_device_add(pdev);
1614 	if (err) {
1615 		printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
1616 		       err);
1617 		goto exit_device_put;
1618 	}
1619 
1620 	return 0;
1621 
1622 exit_device_put:
1623 	platform_device_put(pdev);
1624 exit:
1625 	return err;
1626 }
1627 
1628 static int __init sm_it87_init(void)
1629 {
1630 	int err;
1631 	unsigned short isa_address=0;
1632 	struct it87_sio_data sio_data;
1633 
1634 	memset(&sio_data, 0, sizeof(struct it87_sio_data));
1635 	err = it87_find(&isa_address, &sio_data);
1636 	if (err)
1637 		return err;
1638 	err = platform_driver_register(&it87_driver);
1639 	if (err)
1640 		return err;
1641 
1642 	err = it87_device_add(isa_address, &sio_data);
1643 	if (err){
1644 		platform_driver_unregister(&it87_driver);
1645 		return err;
1646 	}
1647 
1648 	return 0;
1649 }
1650 
1651 static void __exit sm_it87_exit(void)
1652 {
1653 	platform_device_unregister(pdev);
1654 	platform_driver_unregister(&it87_driver);
1655 }
1656 
1657 
1658 MODULE_AUTHOR("Chris Gauthron, "
1659 	      "Jean Delvare <khali@linux-fr.org>");
1660 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8720F/8726F, SiS950 driver");
1661 module_param(update_vbat, bool, 0);
1662 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1663 module_param(fix_pwm_polarity, bool, 0);
1664 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1665 MODULE_LICENSE("GPL");
1666 
1667 module_init(sm_it87_init);
1668 module_exit(sm_it87_exit);
1669