[PATCH] I2C: Remove .owner setting from i2c_driver as it's no longer needed
[linux-2.6.git] / drivers / hwmon / it87.c
1 /*
2     it87.c - Part of lm_sensors, Linux kernel modules for hardware
3              monitoring.
4
5     Supports: IT8705F  Super I/O chip w/LPC interface
6               IT8712F  Super I/O chip w/LPC interface & SMBus
7               Sis950   A clone of the IT8705F
8
9     Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com> 
10     Largely inspired by lm78.c of the same package
11
12     This program is free software; you can redistribute it and/or modify
13     it under the terms of the GNU General Public License as published by
14     the Free Software Foundation; either version 2 of the License, or
15     (at your option) any later version.
16
17     This program is distributed in the hope that it will be useful,
18     but WITHOUT ANY WARRANTY; without even the implied warranty of
19     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20     GNU General Public License for more details.
21
22     You should have received a copy of the GNU General Public License
23     along with this program; if not, write to the Free Software
24     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 */
26
27 /*
28     djg@pdp8.net David Gesswein 7/18/01
29     Modified to fix bug with not all alarms enabled.
30     Added ability to read battery voltage and select temperature sensor
31     type at module load time.
32 */
33
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/slab.h>
37 #include <linux/jiffies.h>
38 #include <linux/i2c.h>
39 #include <linux/i2c-isa.h>
40 #include <linux/hwmon.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/hwmon-vid.h>
43 #include <linux/err.h>
44 #include <asm/io.h>
45
46
47 /* Addresses to scan */
48 static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
49                                         0x2e, 0x2f, I2C_CLIENT_END };
50 static unsigned short isa_address;
51
52 /* Insmod parameters */
53 I2C_CLIENT_INSMOD_2(it87, it8712);
54
55 #define REG     0x2e    /* The register to read/write */
56 #define DEV     0x07    /* Register: Logical device select */
57 #define VAL     0x2f    /* The value to read/write */
58 #define PME     0x04    /* The device with the fan registers in it */
59 #define DEVID   0x20    /* Register: Device ID */
60 #define DEVREV  0x22    /* Register: Device Revision */
61
62 static inline int
63 superio_inb(int reg)
64 {
65         outb(reg, REG);
66         return inb(VAL);
67 }
68
69 static int superio_inw(int reg)
70 {
71         int val;
72         outb(reg++, REG);
73         val = inb(VAL) << 8;
74         outb(reg, REG);
75         val |= inb(VAL);
76         return val;
77 }
78
79 static inline void
80 superio_select(void)
81 {
82         outb(DEV, REG);
83         outb(PME, VAL);
84 }
85
86 static inline void
87 superio_enter(void)
88 {
89         outb(0x87, REG);
90         outb(0x01, REG);
91         outb(0x55, REG);
92         outb(0x55, REG);
93 }
94
95 static inline void
96 superio_exit(void)
97 {
98         outb(0x02, REG);
99         outb(0x02, VAL);
100 }
101
102 #define IT8712F_DEVID 0x8712
103 #define IT8705F_DEVID 0x8705
104 #define IT87_ACT_REG  0x30
105 #define IT87_BASE_REG 0x60
106
107 /* Update battery voltage after every reading if true */
108 static int update_vbat;
109
110 /* Not all BIOSes properly configure the PWM registers */
111 static int fix_pwm_polarity;
112
113 /* Chip Type */
114
115 static u16 chip_type;
116
117 /* Many IT87 constants specified below */
118
119 /* Length of ISA address segment */
120 #define IT87_EXTENT 8
121
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
125
126 /*----- The IT87 registers -----*/
127
128 #define IT87_REG_CONFIG        0x00
129
130 #define IT87_REG_ALARM1        0x01
131 #define IT87_REG_ALARM2        0x02
132 #define IT87_REG_ALARM3        0x03
133
134 #define IT87_REG_VID           0x0a
135 #define IT87_REG_FAN_DIV       0x0b
136
137 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
138
139 #define IT87_REG_FAN(nr)       (0x0d + (nr))
140 #define IT87_REG_FAN_MIN(nr)   (0x10 + (nr))
141 #define IT87_REG_FAN_MAIN_CTRL 0x13
142 #define IT87_REG_FAN_CTL       0x14
143 #define IT87_REG_PWM(nr)       (0x15 + (nr))
144
145 #define IT87_REG_VIN(nr)       (0x20 + (nr))
146 #define IT87_REG_TEMP(nr)      (0x29 + (nr))
147
148 #define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
149 #define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
150 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
151 #define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
152
153 #define IT87_REG_I2C_ADDR      0x48
154
155 #define IT87_REG_VIN_ENABLE    0x50
156 #define IT87_REG_TEMP_ENABLE   0x51
157
158 #define IT87_REG_CHIPID        0x58
159
160 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
161 #define IN_FROM_REG(val) ((val) * 16)
162
163 static inline u8 FAN_TO_REG(long rpm, int div)
164 {
165         if (rpm == 0)
166                 return 255;
167         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
168         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
169                              254);
170 }
171
172 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
173
174 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
175                                         ((val)+500)/1000),-128,127))
176 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
177
178 #define PWM_TO_REG(val)   ((val) >> 1)
179 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
180
181 static int DIV_TO_REG(int val)
182 {
183         int answer = 0;
184         while ((val >>= 1) != 0)
185                 answer++;
186         return answer;
187 }
188 #define DIV_FROM_REG(val) (1 << (val))
189
190
191 /* For each registered IT87, we need to keep some data in memory. That
192    data is pointed to by it87_list[NR]->data. The structure itself is
193    dynamically allocated, at the same time when a new it87 client is
194    allocated. */
195 struct it87_data {
196         struct i2c_client client;
197         struct class_device *class_dev;
198         struct semaphore lock;
199         enum chips type;
200
201         struct semaphore update_lock;
202         char valid;             /* !=0 if following fields are valid */
203         unsigned long last_updated;     /* In jiffies */
204
205         u8 in[9];               /* Register value */
206         u8 in_max[9];           /* Register value */
207         u8 in_min[9];           /* Register value */
208         u8 fan[3];              /* Register value */
209         u8 fan_min[3];          /* Register value */
210         u8 temp[3];             /* Register value */
211         u8 temp_high[3];        /* Register value */
212         u8 temp_low[3];         /* Register value */
213         u8 sensor;              /* Register value */
214         u8 fan_div[3];          /* Register encoding, shifted right */
215         u8 vid;                 /* Register encoding, combined */
216         int vrm;
217         u32 alarms;             /* Register encoding, combined */
218         u8 fan_main_ctrl;       /* Register value */
219         u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
220 };
221
222
223 static int it87_attach_adapter(struct i2c_adapter *adapter);
224 static int it87_isa_attach_adapter(struct i2c_adapter *adapter);
225 static int it87_detect(struct i2c_adapter *adapter, int address, int kind);
226 static int it87_detach_client(struct i2c_client *client);
227
228 static int it87_read_value(struct i2c_client *client, u8 register);
229 static int it87_write_value(struct i2c_client *client, u8 register,
230                         u8 value);
231 static struct it87_data *it87_update_device(struct device *dev);
232 static int it87_check_pwm(struct i2c_client *client);
233 static void it87_init_client(struct i2c_client *client, struct it87_data *data);
234
235
236 static struct i2c_driver it87_driver = {
237         .driver = {
238                 .name   = "it87",
239         },
240         .id             = I2C_DRIVERID_IT87,
241         .attach_adapter = it87_attach_adapter,
242         .detach_client  = it87_detach_client,
243 };
244
245 static struct i2c_driver it87_isa_driver = {
246         .driver = {
247                 .name   = "it87-isa",
248         },
249         .attach_adapter = it87_isa_attach_adapter,
250         .detach_client  = it87_detach_client,
251 };
252
253
254 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
255                 char *buf)
256 {
257         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
258         int nr = sensor_attr->index;
259
260         struct it87_data *data = it87_update_device(dev);
261         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
262 }
263
264 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
265                 char *buf)
266 {
267         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
268         int nr = sensor_attr->index;
269
270         struct it87_data *data = it87_update_device(dev);
271         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
272 }
273
274 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
275                 char *buf)
276 {
277         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
278         int nr = sensor_attr->index;
279
280         struct it87_data *data = it87_update_device(dev);
281         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
282 }
283
284 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
285                 const char *buf, size_t count)
286 {
287         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
288         int nr = sensor_attr->index;
289
290         struct i2c_client *client = to_i2c_client(dev);
291         struct it87_data *data = i2c_get_clientdata(client);
292         unsigned long val = simple_strtoul(buf, NULL, 10);
293
294         down(&data->update_lock);
295         data->in_min[nr] = IN_TO_REG(val);
296         it87_write_value(client, IT87_REG_VIN_MIN(nr), 
297                         data->in_min[nr]);
298         up(&data->update_lock);
299         return count;
300 }
301 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
302                 const char *buf, size_t count)
303 {
304         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
305         int nr = sensor_attr->index;
306
307         struct i2c_client *client = to_i2c_client(dev);
308         struct it87_data *data = i2c_get_clientdata(client);
309         unsigned long val = simple_strtoul(buf, NULL, 10);
310
311         down(&data->update_lock);
312         data->in_max[nr] = IN_TO_REG(val);
313         it87_write_value(client, IT87_REG_VIN_MAX(nr), 
314                         data->in_max[nr]);
315         up(&data->update_lock);
316         return count;
317 }
318
319 #define show_in_offset(offset)                                  \
320 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
321                 show_in, NULL, offset);
322
323 #define limit_in_offset(offset)                                 \
324 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
325                 show_in_min, set_in_min, offset);               \
326 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
327                 show_in_max, set_in_max, offset);
328
329 show_in_offset(0);
330 limit_in_offset(0);
331 show_in_offset(1);
332 limit_in_offset(1);
333 show_in_offset(2);
334 limit_in_offset(2);
335 show_in_offset(3);
336 limit_in_offset(3);
337 show_in_offset(4);
338 limit_in_offset(4);
339 show_in_offset(5);
340 limit_in_offset(5);
341 show_in_offset(6);
342 limit_in_offset(6);
343 show_in_offset(7);
344 limit_in_offset(7);
345 show_in_offset(8);
346
347 /* 3 temperatures */
348 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
349                 char *buf)
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 = it87_update_device(dev);
355         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
356 }
357 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
358                 char *buf)
359 {
360         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
361         int nr = sensor_attr->index;
362
363         struct it87_data *data = it87_update_device(dev);
364         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
365 }
366 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
367                 char *buf)
368 {
369         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
370         int nr = sensor_attr->index;
371
372         struct it87_data *data = it87_update_device(dev);
373         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
374 }
375 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
376                 const char *buf, size_t count)
377 {
378         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
379         int nr = sensor_attr->index;
380
381         struct i2c_client *client = to_i2c_client(dev);
382         struct it87_data *data = i2c_get_clientdata(client);
383         int val = simple_strtol(buf, NULL, 10);
384
385         down(&data->update_lock);
386         data->temp_high[nr] = TEMP_TO_REG(val);
387         it87_write_value(client, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
388         up(&data->update_lock);
389         return count;
390 }
391 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
392                 const char *buf, size_t count)
393 {
394         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
395         int nr = sensor_attr->index;
396
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);
400
401         down(&data->update_lock);
402         data->temp_low[nr] = TEMP_TO_REG(val);
403         it87_write_value(client, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
404         up(&data->update_lock);
405         return count;
406 }
407 #define show_temp_offset(offset)                                        \
408 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
409                 show_temp, NULL, offset - 1);                           \
410 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
411                 show_temp_max, set_temp_max, offset - 1);               \
412 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
413                 show_temp_min, set_temp_min, offset - 1);
414
415 show_temp_offset(1);
416 show_temp_offset(2);
417 show_temp_offset(3);
418
419 static ssize_t show_sensor(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         u8 reg = data->sensor; /* In case the value is updated while we use it */
427         
428         if (reg & (1 << nr))
429                 return sprintf(buf, "3\n");  /* thermal diode */
430         if (reg & (8 << nr))
431                 return sprintf(buf, "2\n");  /* thermistor */
432         return sprintf(buf, "0\n");      /* disabled */
433 }
434 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
435                 const char *buf, size_t count)
436 {
437         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
438         int nr = sensor_attr->index;
439
440         struct i2c_client *client = to_i2c_client(dev);
441         struct it87_data *data = i2c_get_clientdata(client);
442         int val = simple_strtol(buf, NULL, 10);
443
444         down(&data->update_lock);
445
446         data->sensor &= ~(1 << nr);
447         data->sensor &= ~(8 << nr);
448         /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
449         if (val == 3)
450             data->sensor |= 1 << nr;
451         else if (val == 2)
452             data->sensor |= 8 << nr;
453         else if (val != 0) {
454                 up(&data->update_lock);
455                 return -EINVAL;
456         }
457         it87_write_value(client, IT87_REG_TEMP_ENABLE, data->sensor);
458         up(&data->update_lock);
459         return count;
460 }
461 #define show_sensor_offset(offset)                                      \
462 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,       \
463                 show_sensor, set_sensor, offset - 1);
464
465 show_sensor_offset(1);
466 show_sensor_offset(2);
467 show_sensor_offset(3);
468
469 /* 3 Fans */
470 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
471                 char *buf)
472 {
473         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
474         int nr = sensor_attr->index;
475
476         struct it87_data *data = it87_update_device(dev);
477         return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr], 
478                                 DIV_FROM_REG(data->fan_div[nr])));
479 }
480 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
481                 char *buf)
482 {
483         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
484         int nr = sensor_attr->index;
485
486         struct it87_data *data = it87_update_device(dev);
487         return sprintf(buf,"%d\n",
488                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
489 }
490 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
491                 char *buf)
492 {
493         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
494         int nr = sensor_attr->index;
495
496         struct it87_data *data = it87_update_device(dev);
497         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
498 }
499 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
500                 char *buf)
501 {
502         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
503         int nr = sensor_attr->index;
504
505         struct it87_data *data = it87_update_device(dev);
506         return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
507 }
508 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
509                 char *buf)
510 {
511         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
512         int nr = sensor_attr->index;
513
514         struct it87_data *data = it87_update_device(dev);
515         return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
516 }
517 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
518                 const char *buf, size_t count)
519 {
520         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
521         int nr = sensor_attr->index;
522
523         struct i2c_client *client = to_i2c_client(dev);
524         struct it87_data *data = i2c_get_clientdata(client);
525         int val = simple_strtol(buf, NULL, 10);
526         u8 reg = it87_read_value(client, IT87_REG_FAN_DIV);
527
528         down(&data->update_lock);
529         switch (nr) {
530         case 0: data->fan_div[nr] = reg & 0x07; break;
531         case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
532         case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
533         }
534
535         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
536         it87_write_value(client, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
537         up(&data->update_lock);
538         return count;
539 }
540 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
541                 const char *buf, size_t count)
542 {
543         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
544         int nr = sensor_attr->index;
545
546         struct i2c_client *client = to_i2c_client(dev);
547         struct it87_data *data = i2c_get_clientdata(client);
548         int val = simple_strtol(buf, NULL, 10);
549         int i, min[3];
550         u8 old;
551
552         down(&data->update_lock);
553         old = it87_read_value(client, IT87_REG_FAN_DIV);
554
555         for (i = 0; i < 3; i++)
556                 min[i] = FAN_FROM_REG(data->fan_min[i], DIV_FROM_REG(data->fan_div[i]));
557
558         switch (nr) {
559         case 0:
560         case 1:
561                 data->fan_div[nr] = DIV_TO_REG(val);
562                 break;
563         case 2:
564                 if (val < 8)
565                         data->fan_div[nr] = 1;
566                 else
567                         data->fan_div[nr] = 3;
568         }
569         val = old & 0x80;
570         val |= (data->fan_div[0] & 0x07);
571         val |= (data->fan_div[1] & 0x07) << 3;
572         if (data->fan_div[2] == 3)
573                 val |= 0x1 << 6;
574         it87_write_value(client, IT87_REG_FAN_DIV, val);
575
576         for (i = 0; i < 3; i++) {
577                 data->fan_min[i]=FAN_TO_REG(min[i], DIV_FROM_REG(data->fan_div[i]));
578                 it87_write_value(client, IT87_REG_FAN_MIN(i), data->fan_min[i]);
579         }
580         up(&data->update_lock);
581         return count;
582 }
583 static ssize_t set_pwm_enable(struct device *dev,
584                 struct device_attribute *attr, const char *buf, size_t count)
585 {
586         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
587         int nr = sensor_attr->index;
588
589         struct i2c_client *client = to_i2c_client(dev);
590         struct it87_data *data = i2c_get_clientdata(client);
591         int val = simple_strtol(buf, NULL, 10);
592
593         down(&data->update_lock);
594
595         if (val == 0) {
596                 int tmp;
597                 /* make sure the fan is on when in on/off mode */
598                 tmp = it87_read_value(client, IT87_REG_FAN_CTL);
599                 it87_write_value(client, IT87_REG_FAN_CTL, tmp | (1 << nr));
600                 /* set on/off mode */
601                 data->fan_main_ctrl &= ~(1 << nr);
602                 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
603         } else if (val == 1) {
604                 /* set SmartGuardian mode */
605                 data->fan_main_ctrl |= (1 << nr);
606                 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
607                 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
608                 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
609         } else {
610                 up(&data->update_lock);
611                 return -EINVAL;
612         }
613
614         up(&data->update_lock);
615         return count;
616 }
617 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
618                 const char *buf, size_t count)
619 {
620         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
621         int nr = sensor_attr->index;
622
623         struct i2c_client *client = to_i2c_client(dev);
624         struct it87_data *data = i2c_get_clientdata(client);
625         int val = simple_strtol(buf, NULL, 10);
626
627         if (val < 0 || val > 255)
628                 return -EINVAL;
629
630         down(&data->update_lock);
631         data->manual_pwm_ctl[nr] = val;
632         if (data->fan_main_ctrl & (1 << nr))
633                 it87_write_value(client, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
634         up(&data->update_lock);
635         return count;
636 }
637
638 #define show_fan_offset(offset)                                 \
639 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
640                 show_fan, NULL, offset - 1);                    \
641 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
642                 show_fan_min, set_fan_min, offset - 1);         \
643 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
644                 show_fan_div, set_fan_div, offset - 1);
645
646 show_fan_offset(1);
647 show_fan_offset(2);
648 show_fan_offset(3);
649
650 #define show_pwm_offset(offset)                                         \
651 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,      \
652                 show_pwm_enable, set_pwm_enable, offset - 1);           \
653 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,               \
654                 show_pwm, set_pwm, offset - 1);
655
656 show_pwm_offset(1);
657 show_pwm_offset(2);
658 show_pwm_offset(3);
659
660 /* Alarms */
661 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
662 {
663         struct it87_data *data = it87_update_device(dev);
664         return sprintf(buf, "%u\n", data->alarms);
665 }
666 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
667
668 static ssize_t
669 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
670 {
671         struct it87_data *data = it87_update_device(dev);
672         return sprintf(buf, "%ld\n", (long) data->vrm);
673 }
674 static ssize_t
675 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
676 {
677         struct i2c_client *client = to_i2c_client(dev);
678         struct it87_data *data = i2c_get_clientdata(client);
679         u32 val;
680
681         val = simple_strtoul(buf, NULL, 10);
682         data->vrm = val;
683
684         return count;
685 }
686 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
687 #define device_create_file_vrm(client) \
688 device_create_file(&client->dev, &dev_attr_vrm)
689
690 static ssize_t
691 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
692 {
693         struct it87_data *data = it87_update_device(dev);
694         return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
695 }
696 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
697 #define device_create_file_vid(client) \
698 device_create_file(&client->dev, &dev_attr_cpu0_vid)
699
700 /* This function is called when:
701      * it87_driver is inserted (when this module is loaded), for each
702        available adapter
703      * when a new adapter is inserted (and it87_driver is still present) */
704 static int it87_attach_adapter(struct i2c_adapter *adapter)
705 {
706         if (!(adapter->class & I2C_CLASS_HWMON))
707                 return 0;
708         return i2c_probe(adapter, &addr_data, it87_detect);
709 }
710
711 static int it87_isa_attach_adapter(struct i2c_adapter *adapter)
712 {
713         return it87_detect(adapter, isa_address, -1);
714 }
715
716 /* SuperIO detection - will change isa_address if a chip is found */
717 static int __init it87_find(unsigned short *address)
718 {
719         int err = -ENODEV;
720
721         superio_enter();
722         chip_type = superio_inw(DEVID);
723         if (chip_type != IT8712F_DEVID
724          && chip_type != IT8705F_DEVID)
725                 goto exit;
726
727         superio_select();
728         if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
729                 pr_info("it87: Device not activated, skipping\n");
730                 goto exit;
731         }
732
733         *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
734         if (*address == 0) {
735                 pr_info("it87: Base address not set, skipping\n");
736                 goto exit;
737         }
738
739         err = 0;
740         pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
741                 chip_type, *address, superio_inb(DEVREV) & 0x0f);
742
743 exit:
744         superio_exit();
745         return err;
746 }
747
748 /* This function is called by i2c_probe */
749 static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
750 {
751         int i;
752         struct i2c_client *new_client;
753         struct it87_data *data;
754         int err = 0;
755         const char *name = "";
756         int is_isa = i2c_is_isa_adapter(adapter);
757         int enable_pwm_interface;
758
759         if (!is_isa && 
760             !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
761                 goto ERROR0;
762
763         /* Reserve the ISA region */
764         if (is_isa)
765                 if (!request_region(address, IT87_EXTENT,
766                                     it87_isa_driver.driver.name))
767                         goto ERROR0;
768
769         /* For now, we presume we have a valid client. We create the
770            client structure, even though we cannot fill it completely yet.
771            But it allows us to access it87_{read,write}_value. */
772
773         if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
774                 err = -ENOMEM;
775                 goto ERROR1;
776         }
777
778         new_client = &data->client;
779         if (is_isa)
780                 init_MUTEX(&data->lock);
781         i2c_set_clientdata(new_client, data);
782         new_client->addr = address;
783         new_client->adapter = adapter;
784         new_client->driver = is_isa ? &it87_isa_driver : &it87_driver;
785         new_client->flags = 0;
786
787         /* Now, we do the remaining detection. */
788
789         if (kind < 0) {
790                 if ((it87_read_value(new_client, IT87_REG_CONFIG) & 0x80)
791                   || (!is_isa
792                    && it87_read_value(new_client, IT87_REG_I2C_ADDR) != address)) {
793                         err = -ENODEV;
794                         goto ERROR2;
795                 }
796         }
797
798         /* Determine the chip type. */
799         if (kind <= 0) {
800                 i = it87_read_value(new_client, IT87_REG_CHIPID);
801                 if (i == 0x90) {
802                         kind = it87;
803                         if ((is_isa) && (chip_type == IT8712F_DEVID))
804                                 kind = it8712;
805                 }
806                 else {
807                         if (kind == 0)
808                                 dev_info(&adapter->dev, 
809                                         "Ignoring 'force' parameter for unknown chip at "
810                                         "adapter %d, address 0x%02x\n",
811                                         i2c_adapter_id(adapter), address);
812                         err = -ENODEV;
813                         goto ERROR2;
814                 }
815         }
816
817         if (kind == it87) {
818                 name = "it87";
819         } else if (kind == it8712) {
820                 name = "it8712";
821         }
822
823         /* Fill in the remaining client fields and put it into the global list */
824         strlcpy(new_client->name, name, I2C_NAME_SIZE);
825         data->type = kind;
826         data->valid = 0;
827         init_MUTEX(&data->update_lock);
828
829         /* Tell the I2C layer a new client has arrived */
830         if ((err = i2c_attach_client(new_client)))
831                 goto ERROR2;
832
833         /* Check PWM configuration */
834         enable_pwm_interface = it87_check_pwm(new_client);
835
836         /* Initialize the IT87 chip */
837         it87_init_client(new_client, data);
838
839         /* Register sysfs hooks */
840         data->class_dev = hwmon_device_register(&new_client->dev);
841         if (IS_ERR(data->class_dev)) {
842                 err = PTR_ERR(data->class_dev);
843                 goto ERROR3;
844         }
845
846         device_create_file(&new_client->dev, &sensor_dev_attr_in0_input.dev_attr);
847         device_create_file(&new_client->dev, &sensor_dev_attr_in1_input.dev_attr);
848         device_create_file(&new_client->dev, &sensor_dev_attr_in2_input.dev_attr);
849         device_create_file(&new_client->dev, &sensor_dev_attr_in3_input.dev_attr);
850         device_create_file(&new_client->dev, &sensor_dev_attr_in4_input.dev_attr);
851         device_create_file(&new_client->dev, &sensor_dev_attr_in5_input.dev_attr);
852         device_create_file(&new_client->dev, &sensor_dev_attr_in6_input.dev_attr);
853         device_create_file(&new_client->dev, &sensor_dev_attr_in7_input.dev_attr);
854         device_create_file(&new_client->dev, &sensor_dev_attr_in8_input.dev_attr);
855         device_create_file(&new_client->dev, &sensor_dev_attr_in0_min.dev_attr);
856         device_create_file(&new_client->dev, &sensor_dev_attr_in1_min.dev_attr);
857         device_create_file(&new_client->dev, &sensor_dev_attr_in2_min.dev_attr);
858         device_create_file(&new_client->dev, &sensor_dev_attr_in3_min.dev_attr);
859         device_create_file(&new_client->dev, &sensor_dev_attr_in4_min.dev_attr);
860         device_create_file(&new_client->dev, &sensor_dev_attr_in5_min.dev_attr);
861         device_create_file(&new_client->dev, &sensor_dev_attr_in6_min.dev_attr);
862         device_create_file(&new_client->dev, &sensor_dev_attr_in7_min.dev_attr);
863         device_create_file(&new_client->dev, &sensor_dev_attr_in0_max.dev_attr);
864         device_create_file(&new_client->dev, &sensor_dev_attr_in1_max.dev_attr);
865         device_create_file(&new_client->dev, &sensor_dev_attr_in2_max.dev_attr);
866         device_create_file(&new_client->dev, &sensor_dev_attr_in3_max.dev_attr);
867         device_create_file(&new_client->dev, &sensor_dev_attr_in4_max.dev_attr);
868         device_create_file(&new_client->dev, &sensor_dev_attr_in5_max.dev_attr);
869         device_create_file(&new_client->dev, &sensor_dev_attr_in6_max.dev_attr);
870         device_create_file(&new_client->dev, &sensor_dev_attr_in7_max.dev_attr);
871         device_create_file(&new_client->dev, &sensor_dev_attr_temp1_input.dev_attr);
872         device_create_file(&new_client->dev, &sensor_dev_attr_temp2_input.dev_attr);
873         device_create_file(&new_client->dev, &sensor_dev_attr_temp3_input.dev_attr);
874         device_create_file(&new_client->dev, &sensor_dev_attr_temp1_max.dev_attr);
875         device_create_file(&new_client->dev, &sensor_dev_attr_temp2_max.dev_attr);
876         device_create_file(&new_client->dev, &sensor_dev_attr_temp3_max.dev_attr);
877         device_create_file(&new_client->dev, &sensor_dev_attr_temp1_min.dev_attr);
878         device_create_file(&new_client->dev, &sensor_dev_attr_temp2_min.dev_attr);
879         device_create_file(&new_client->dev, &sensor_dev_attr_temp3_min.dev_attr);
880         device_create_file(&new_client->dev, &sensor_dev_attr_temp1_type.dev_attr);
881         device_create_file(&new_client->dev, &sensor_dev_attr_temp2_type.dev_attr);
882         device_create_file(&new_client->dev, &sensor_dev_attr_temp3_type.dev_attr);
883         device_create_file(&new_client->dev, &sensor_dev_attr_fan1_input.dev_attr);
884         device_create_file(&new_client->dev, &sensor_dev_attr_fan2_input.dev_attr);
885         device_create_file(&new_client->dev, &sensor_dev_attr_fan3_input.dev_attr);
886         device_create_file(&new_client->dev, &sensor_dev_attr_fan1_min.dev_attr);
887         device_create_file(&new_client->dev, &sensor_dev_attr_fan2_min.dev_attr);
888         device_create_file(&new_client->dev, &sensor_dev_attr_fan3_min.dev_attr);
889         device_create_file(&new_client->dev, &sensor_dev_attr_fan1_div.dev_attr);
890         device_create_file(&new_client->dev, &sensor_dev_attr_fan2_div.dev_attr);
891         device_create_file(&new_client->dev, &sensor_dev_attr_fan3_div.dev_attr);
892         device_create_file(&new_client->dev, &dev_attr_alarms);
893         if (enable_pwm_interface) {
894                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm1_enable.dev_attr);
895                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm2_enable.dev_attr);
896                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm3_enable.dev_attr);
897                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm1.dev_attr);
898                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm2.dev_attr);
899                 device_create_file(&new_client->dev, &sensor_dev_attr_pwm3.dev_attr);
900         }
901
902         if (data->type == it8712) {
903                 data->vrm = vid_which_vrm();
904                 device_create_file_vrm(new_client);
905                 device_create_file_vid(new_client);
906         }
907
908         return 0;
909
910 ERROR3:
911         i2c_detach_client(new_client);
912 ERROR2:
913         kfree(data);
914 ERROR1:
915         if (is_isa)
916                 release_region(address, IT87_EXTENT);
917 ERROR0:
918         return err;
919 }
920
921 static int it87_detach_client(struct i2c_client *client)
922 {
923         struct it87_data *data = i2c_get_clientdata(client);
924         int err;
925
926         hwmon_device_unregister(data->class_dev);
927
928         if ((err = i2c_detach_client(client)))
929                 return err;
930
931         if(i2c_is_isa_client(client))
932                 release_region(client->addr, IT87_EXTENT);
933         kfree(data);
934
935         return 0;
936 }
937
938 /* The SMBus locks itself, but ISA access must be locked explicitly! 
939    We don't want to lock the whole ISA bus, so we lock each client
940    separately.
941    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
942    would slow down the IT87 access and should not be necessary. */
943 static int it87_read_value(struct i2c_client *client, u8 reg)
944 {
945         struct it87_data *data = i2c_get_clientdata(client);
946
947         int res;
948         if (i2c_is_isa_client(client)) {
949                 down(&data->lock);
950                 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
951                 res = inb_p(client->addr + IT87_DATA_REG_OFFSET);
952                 up(&data->lock);
953                 return res;
954         } else
955                 return i2c_smbus_read_byte_data(client, reg);
956 }
957
958 /* The SMBus locks itself, but ISA access muse be locked explicitly! 
959    We don't want to lock the whole ISA bus, so we lock each client
960    separately.
961    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
962    would slow down the IT87 access and should not be necessary. */
963 static int it87_write_value(struct i2c_client *client, u8 reg, u8 value)
964 {
965         struct it87_data *data = i2c_get_clientdata(client);
966
967         if (i2c_is_isa_client(client)) {
968                 down(&data->lock);
969                 outb_p(reg, client->addr + IT87_ADDR_REG_OFFSET);
970                 outb_p(value, client->addr + IT87_DATA_REG_OFFSET);
971                 up(&data->lock);
972                 return 0;
973         } else
974                 return i2c_smbus_write_byte_data(client, reg, value);
975 }
976
977 /* Return 1 if and only if the PWM interface is safe to use */
978 static int it87_check_pwm(struct i2c_client *client)
979 {
980         /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
981          * and polarity set to active low is sign that this is the case so we
982          * disable pwm control to protect the user. */
983         int tmp = it87_read_value(client, IT87_REG_FAN_CTL);
984         if ((tmp & 0x87) == 0) {
985                 if (fix_pwm_polarity) {
986                         /* The user asks us to attempt a chip reconfiguration.
987                          * This means switching to active high polarity and
988                          * inverting all fan speed values. */
989                         int i;
990                         u8 pwm[3];
991
992                         for (i = 0; i < 3; i++)
993                                 pwm[i] = it87_read_value(client,
994                                                          IT87_REG_PWM(i));
995
996                         /* If any fan is in automatic pwm mode, the polarity
997                          * might be correct, as suspicious as it seems, so we
998                          * better don't change anything (but still disable the
999                          * PWM interface). */
1000                         if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1001                                 dev_info(&client->dev, "Reconfiguring PWM to "
1002                                          "active high polarity\n");
1003                                 it87_write_value(client, IT87_REG_FAN_CTL,
1004                                                  tmp | 0x87);
1005                                 for (i = 0; i < 3; i++)
1006                                         it87_write_value(client,
1007                                                          IT87_REG_PWM(i),
1008                                                          0x7f & ~pwm[i]);
1009                                 return 1;
1010                         }
1011
1012                         dev_info(&client->dev, "PWM configuration is "
1013                                  "too broken to be fixed\n");
1014                 }
1015
1016                 dev_info(&client->dev, "Detected broken BIOS "
1017                          "defaults, disabling PWM interface\n");
1018                 return 0;
1019         } else if (fix_pwm_polarity) {
1020                 dev_info(&client->dev, "PWM configuration looks "
1021                          "sane, won't touch\n");
1022         }
1023
1024         return 1;
1025 }
1026
1027 /* Called when we have found a new IT87. */
1028 static void it87_init_client(struct i2c_client *client, struct it87_data *data)
1029 {
1030         int tmp, i;
1031
1032         /* initialize to sane defaults:
1033          * - if the chip is in manual pwm mode, this will be overwritten with
1034          *   the actual settings on the chip (so in this case, initialization
1035          *   is not needed)
1036          * - if in automatic or on/off mode, we could switch to manual mode,
1037          *   read the registers and set manual_pwm_ctl accordingly, but currently
1038          *   this is not implemented, so we initialize to something sane */
1039         for (i = 0; i < 3; i++) {
1040                 data->manual_pwm_ctl[i] = 0xff;
1041         }
1042
1043         /* Check if temperature channnels are reset manually or by some reason */
1044         tmp = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1045         if ((tmp & 0x3f) == 0) {
1046                 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1047                 tmp = (tmp & 0xc0) | 0x2a;
1048                 it87_write_value(client, IT87_REG_TEMP_ENABLE, tmp);
1049         }
1050         data->sensor = tmp;
1051
1052         /* Check if voltage monitors are reset manually or by some reason */
1053         tmp = it87_read_value(client, IT87_REG_VIN_ENABLE);
1054         if ((tmp & 0xff) == 0) {
1055                 /* Enable all voltage monitors */
1056                 it87_write_value(client, IT87_REG_VIN_ENABLE, 0xff);
1057         }
1058
1059         /* Check if tachometers are reset manually or by some reason */
1060         data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1061         if ((data->fan_main_ctrl & 0x70) == 0) {
1062                 /* Enable all fan tachometers */
1063                 data->fan_main_ctrl |= 0x70;
1064                 it87_write_value(client, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1065         }
1066
1067         /* Set current fan mode registers and the default settings for the
1068          * other mode registers */
1069         for (i = 0; i < 3; i++) {
1070                 if (data->fan_main_ctrl & (1 << i)) {
1071                         /* pwm mode */
1072                         tmp = it87_read_value(client, IT87_REG_PWM(i));
1073                         if (tmp & 0x80) {
1074                                 /* automatic pwm - not yet implemented, but
1075                                  * leave the settings made by the BIOS alone
1076                                  * until a change is requested via the sysfs
1077                                  * interface */
1078                         } else {
1079                                 /* manual pwm */
1080                                 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1081                         }
1082                 }
1083         }
1084
1085         /* Start monitoring */
1086         it87_write_value(client, IT87_REG_CONFIG,
1087                          (it87_read_value(client, IT87_REG_CONFIG) & 0x36)
1088                          | (update_vbat ? 0x41 : 0x01));
1089 }
1090
1091 static struct it87_data *it87_update_device(struct device *dev)
1092 {
1093         struct i2c_client *client = to_i2c_client(dev);
1094         struct it87_data *data = i2c_get_clientdata(client);
1095         int i;
1096
1097         down(&data->update_lock);
1098
1099         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1100             || !data->valid) {
1101
1102                 if (update_vbat) {
1103                         /* Cleared after each update, so reenable.  Value
1104                           returned by this read will be previous value */       
1105                         it87_write_value(client, IT87_REG_CONFIG,
1106                            it87_read_value(client, IT87_REG_CONFIG) | 0x40);
1107                 }
1108                 for (i = 0; i <= 7; i++) {
1109                         data->in[i] =
1110                             it87_read_value(client, IT87_REG_VIN(i));
1111                         data->in_min[i] =
1112                             it87_read_value(client, IT87_REG_VIN_MIN(i));
1113                         data->in_max[i] =
1114                             it87_read_value(client, IT87_REG_VIN_MAX(i));
1115                 }
1116                 data->in[8] =
1117                     it87_read_value(client, IT87_REG_VIN(8));
1118                 /* Temperature sensor doesn't have limit registers, set
1119                    to min and max value */
1120                 data->in_min[8] = 0;
1121                 data->in_max[8] = 255;
1122
1123                 for (i = 0; i < 3; i++) {
1124                         data->fan[i] =
1125                             it87_read_value(client, IT87_REG_FAN(i));
1126                         data->fan_min[i] =
1127                             it87_read_value(client, IT87_REG_FAN_MIN(i));
1128                 }
1129                 for (i = 0; i < 3; i++) {
1130                         data->temp[i] =
1131                             it87_read_value(client, IT87_REG_TEMP(i));
1132                         data->temp_high[i] =
1133                             it87_read_value(client, IT87_REG_TEMP_HIGH(i));
1134                         data->temp_low[i] =
1135                             it87_read_value(client, IT87_REG_TEMP_LOW(i));
1136                 }
1137
1138                 i = it87_read_value(client, IT87_REG_FAN_DIV);
1139                 data->fan_div[0] = i & 0x07;
1140                 data->fan_div[1] = (i >> 3) & 0x07;
1141                 data->fan_div[2] = (i & 0x40) ? 3 : 1;
1142
1143                 data->alarms =
1144                         it87_read_value(client, IT87_REG_ALARM1) |
1145                         (it87_read_value(client, IT87_REG_ALARM2) << 8) |
1146                         (it87_read_value(client, IT87_REG_ALARM3) << 16);
1147                 data->fan_main_ctrl = it87_read_value(client, IT87_REG_FAN_MAIN_CTRL);
1148
1149                 data->sensor = it87_read_value(client, IT87_REG_TEMP_ENABLE);
1150                 /* The 8705 does not have VID capability */
1151                 if (data->type == it8712) {
1152                         data->vid = it87_read_value(client, IT87_REG_VID);
1153                         data->vid &= 0x1f;
1154                 }
1155                 data->last_updated = jiffies;
1156                 data->valid = 1;
1157         }
1158
1159         up(&data->update_lock);
1160
1161         return data;
1162 }
1163
1164 static int __init sm_it87_init(void)
1165 {
1166         int res;
1167
1168         res = i2c_add_driver(&it87_driver);
1169         if (res)
1170                 return res;
1171
1172         if (!it87_find(&isa_address)) {
1173                 res = i2c_isa_add_driver(&it87_isa_driver);
1174                 if (res) {
1175                         i2c_del_driver(&it87_driver);
1176                         return res;
1177                 }
1178         }
1179
1180         return 0;
1181 }
1182
1183 static void __exit sm_it87_exit(void)
1184 {
1185         i2c_isa_del_driver(&it87_isa_driver);
1186         i2c_del_driver(&it87_driver);
1187 }
1188
1189
1190 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
1191 MODULE_DESCRIPTION("IT8705F, IT8712F, Sis950 driver");
1192 module_param(update_vbat, bool, 0);
1193 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1194 module_param(fix_pwm_polarity, bool, 0);
1195 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1196 MODULE_LICENSE("GPL");
1197
1198 module_init(sm_it87_init);
1199 module_exit(sm_it87_exit);