Merge branch 'linus' into genirq
[linux-2.6] / drivers / hwmon / it87.c
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               IT8726F  Super I/O chip w/LPC interface
18               Sis950   A clone of the IT8705F
19
20     Copyright (C) 2001 Chris Gauthron
21     Copyright (C) 2005-2007 Jean Delvare <khali@linux-fr.org>
22
23     This program is free software; you can redistribute it and/or modify
24     it under the terms of the GNU General Public License as published by
25     the Free Software Foundation; either version 2 of the License, or
26     (at your option) any later version.
27
28     This program is distributed in the hope that it will be useful,
29     but WITHOUT ANY WARRANTY; without even the implied warranty of
30     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
31     GNU General Public License for more details.
32
33     You should have received a copy of the GNU General Public License
34     along with this program; if not, write to the Free Software
35     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36 */
37
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/jiffies.h>
42 #include <linux/platform_device.h>
43 #include <linux/hwmon.h>
44 #include <linux/hwmon-sysfs.h>
45 #include <linux/hwmon-vid.h>
46 #include <linux/err.h>
47 #include <linux/mutex.h>
48 #include <linux/sysfs.h>
49 #include <linux/string.h>
50 #include <linux/dmi.h>
51 #include <asm/io.h>
52
53 #define DRVNAME "it87"
54
55 enum chips { it87, it8712, it8716, it8718 };
56
57 static unsigned short force_id;
58 module_param(force_id, ushort, 0);
59 MODULE_PARM_DESC(force_id, "Override the detected device ID");
60
61 static struct platform_device *pdev;
62
63 #define REG     0x2e    /* The register to read/write */
64 #define DEV     0x07    /* Register: Logical device select */
65 #define VAL     0x2f    /* The value to read/write */
66 #define PME     0x04    /* The device with the fan registers in it */
67 #define GPIO    0x07    /* The device with the IT8718F VID value in it */
68 #define DEVID   0x20    /* Register: Device ID */
69 #define DEVREV  0x22    /* Register: Device Revision */
70
71 static inline int
72 superio_inb(int reg)
73 {
74         outb(reg, REG);
75         return inb(VAL);
76 }
77
78 static int superio_inw(int reg)
79 {
80         int val;
81         outb(reg++, REG);
82         val = inb(VAL) << 8;
83         outb(reg, REG);
84         val |= inb(VAL);
85         return val;
86 }
87
88 static inline void
89 superio_select(int ldn)
90 {
91         outb(DEV, REG);
92         outb(ldn, VAL);
93 }
94
95 static inline void
96 superio_enter(void)
97 {
98         outb(0x87, REG);
99         outb(0x01, REG);
100         outb(0x55, REG);
101         outb(0x55, REG);
102 }
103
104 static inline void
105 superio_exit(void)
106 {
107         outb(0x02, REG);
108         outb(0x02, VAL);
109 }
110
111 /* Logical device 4 registers */
112 #define IT8712F_DEVID 0x8712
113 #define IT8705F_DEVID 0x8705
114 #define IT8716F_DEVID 0x8716
115 #define IT8718F_DEVID 0x8718
116 #define IT8726F_DEVID 0x8726
117 #define IT87_ACT_REG  0x30
118 #define IT87_BASE_REG 0x60
119
120 /* Logical device 7 registers (IT8712F and later) */
121 #define IT87_SIO_PINX2_REG      0x2c    /* Pin selection */
122 #define IT87_SIO_VID_REG        0xfc    /* VID value */
123
124 /* Update battery voltage after every reading if true */
125 static int update_vbat;
126
127 /* Not all BIOSes properly configure the PWM registers */
128 static int fix_pwm_polarity;
129
130 /* Many IT87 constants specified below */
131
132 /* Length of ISA address segment */
133 #define IT87_EXTENT 8
134
135 /* Length of ISA address segment for Environmental Controller */
136 #define IT87_EC_EXTENT 2
137
138 /* Offset of EC registers from ISA base address */
139 #define IT87_EC_OFFSET 5
140
141 /* Where are the ISA address/data registers relative to the EC base address */
142 #define IT87_ADDR_REG_OFFSET 0
143 #define IT87_DATA_REG_OFFSET 1
144
145 /*----- The IT87 registers -----*/
146
147 #define IT87_REG_CONFIG        0x00
148
149 #define IT87_REG_ALARM1        0x01
150 #define IT87_REG_ALARM2        0x02
151 #define IT87_REG_ALARM3        0x03
152
153 /* The IT8718F has the VID value in a different register, in Super-I/O
154    configuration space. */
155 #define IT87_REG_VID           0x0a
156 /* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b
157    for fan divisors. Later IT8712F revisions must use 16-bit tachometer
158    mode. */
159 #define IT87_REG_FAN_DIV       0x0b
160 #define IT87_REG_FAN_16BIT     0x0c
161
162 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
163
164 static const u8 IT87_REG_FAN[]          = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
165 static const u8 IT87_REG_FAN_MIN[]      = { 0x10, 0x11, 0x12, 0x84, 0x86 };
166 static const u8 IT87_REG_FANX[]         = { 0x18, 0x19, 0x1a, 0x81, 0x83 };
167 static const u8 IT87_REG_FANX_MIN[]     = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
168 #define IT87_REG_FAN_MAIN_CTRL 0x13
169 #define IT87_REG_FAN_CTL       0x14
170 #define IT87_REG_PWM(nr)       (0x15 + (nr))
171
172 #define IT87_REG_VIN(nr)       (0x20 + (nr))
173 #define IT87_REG_TEMP(nr)      (0x29 + (nr))
174
175 #define IT87_REG_VIN_MAX(nr)   (0x30 + (nr) * 2)
176 #define IT87_REG_VIN_MIN(nr)   (0x31 + (nr) * 2)
177 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
178 #define IT87_REG_TEMP_LOW(nr)  (0x41 + (nr) * 2)
179
180 #define IT87_REG_VIN_ENABLE    0x50
181 #define IT87_REG_TEMP_ENABLE   0x51
182
183 #define IT87_REG_CHIPID        0x58
184
185 #define IN_TO_REG(val)  (SENSORS_LIMIT((((val) + 8)/16),0,255))
186 #define IN_FROM_REG(val) ((val) * 16)
187
188 static inline u8 FAN_TO_REG(long rpm, int div)
189 {
190         if (rpm == 0)
191                 return 255;
192         rpm = SENSORS_LIMIT(rpm, 1, 1000000);
193         return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
194                              254);
195 }
196
197 static inline u16 FAN16_TO_REG(long rpm)
198 {
199         if (rpm == 0)
200                 return 0xffff;
201         return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
202 }
203
204 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
205 /* The divider is fixed to 2 in 16-bit mode */
206 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
207
208 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
209                                         ((val)+500)/1000),-128,127))
210 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
211
212 #define PWM_TO_REG(val)   ((val) >> 1)
213 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
214
215 static int DIV_TO_REG(int val)
216 {
217         int answer = 0;
218         while (answer < 7 && (val >>= 1))
219                 answer++;
220         return answer;
221 }
222 #define DIV_FROM_REG(val) (1 << (val))
223
224 static const unsigned int pwm_freq[8] = {
225         48000000 / 128,
226         24000000 / 128,
227         12000000 / 128,
228         8000000 / 128,
229         6000000 / 128,
230         3000000 / 128,
231         1500000 / 128,
232         750000 / 128,
233 };
234
235
236 struct it87_sio_data {
237         enum chips type;
238         /* Values read from Super-I/O config space */
239         u8 revision;
240         u8 vid_value;
241         /* Values set based on DMI strings */
242         u8 skip_pwm;
243 };
244
245 /* For each registered chip, we need to keep some data in memory.
246    The structure is dynamically allocated. */
247 struct it87_data {
248         struct device *hwmon_dev;
249         enum chips type;
250         u8 revision;
251
252         unsigned short addr;
253         const char *name;
254         struct mutex update_lock;
255         char valid;             /* !=0 if following fields are valid */
256         unsigned long last_updated;     /* In jiffies */
257
258         u8 in[9];               /* Register value */
259         u8 in_max[8];           /* Register value */
260         u8 in_min[8];           /* Register value */
261         u8 has_fan;             /* Bitfield, fans enabled */
262         u16 fan[5];             /* Register values, possibly combined */
263         u16 fan_min[5];         /* Register values, possibly combined */
264         u8 temp[3];             /* Register value */
265         u8 temp_high[3];        /* Register value */
266         u8 temp_low[3];         /* Register value */
267         u8 sensor;              /* Register value */
268         u8 fan_div[3];          /* Register encoding, shifted right */
269         u8 vid;                 /* Register encoding, combined */
270         u8 vrm;
271         u32 alarms;             /* Register encoding, combined */
272         u8 fan_main_ctrl;       /* Register value */
273         u8 fan_ctl;             /* Register value */
274         u8 manual_pwm_ctl[3];   /* manual PWM value set by user */
275 };
276
277 static inline int has_16bit_fans(const struct it87_data *data)
278 {
279         /* IT8705F Datasheet 0.4.1, 3h == Version G.
280            IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
281            These are the first revisions with 16bit tachometer support. */
282         return (data->type == it87 && data->revision >= 0x03)
283             || (data->type == it8712 && data->revision >= 0x08)
284             || data->type == it8716
285             || data->type == it8718;
286 }
287
288 static int it87_probe(struct platform_device *pdev);
289 static int __devexit it87_remove(struct platform_device *pdev);
290
291 static int it87_read_value(struct it87_data *data, u8 reg);
292 static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
293 static struct it87_data *it87_update_device(struct device *dev);
294 static int it87_check_pwm(struct device *dev);
295 static void it87_init_device(struct platform_device *pdev);
296
297
298 static struct platform_driver it87_driver = {
299         .driver = {
300                 .owner  = THIS_MODULE,
301                 .name   = DRVNAME,
302         },
303         .probe  = it87_probe,
304         .remove = __devexit_p(it87_remove),
305 };
306
307 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
308                 char *buf)
309 {
310         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
311         int nr = sensor_attr->index;
312
313         struct it87_data *data = it87_update_device(dev);
314         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
315 }
316
317 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
318                 char *buf)
319 {
320         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
321         int nr = sensor_attr->index;
322
323         struct it87_data *data = it87_update_device(dev);
324         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
325 }
326
327 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
328                 char *buf)
329 {
330         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
331         int nr = sensor_attr->index;
332
333         struct it87_data *data = it87_update_device(dev);
334         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
335 }
336
337 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
338                 const char *buf, size_t count)
339 {
340         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
341         int nr = sensor_attr->index;
342
343         struct it87_data *data = dev_get_drvdata(dev);
344         unsigned long val = simple_strtoul(buf, NULL, 10);
345
346         mutex_lock(&data->update_lock);
347         data->in_min[nr] = IN_TO_REG(val);
348         it87_write_value(data, IT87_REG_VIN_MIN(nr),
349                         data->in_min[nr]);
350         mutex_unlock(&data->update_lock);
351         return count;
352 }
353 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
354                 const char *buf, size_t count)
355 {
356         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
357         int nr = sensor_attr->index;
358
359         struct it87_data *data = dev_get_drvdata(dev);
360         unsigned long val = simple_strtoul(buf, NULL, 10);
361
362         mutex_lock(&data->update_lock);
363         data->in_max[nr] = IN_TO_REG(val);
364         it87_write_value(data, IT87_REG_VIN_MAX(nr),
365                         data->in_max[nr]);
366         mutex_unlock(&data->update_lock);
367         return count;
368 }
369
370 #define show_in_offset(offset)                                  \
371 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
372                 show_in, NULL, offset);
373
374 #define limit_in_offset(offset)                                 \
375 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
376                 show_in_min, set_in_min, offset);               \
377 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
378                 show_in_max, set_in_max, offset);
379
380 show_in_offset(0);
381 limit_in_offset(0);
382 show_in_offset(1);
383 limit_in_offset(1);
384 show_in_offset(2);
385 limit_in_offset(2);
386 show_in_offset(3);
387 limit_in_offset(3);
388 show_in_offset(4);
389 limit_in_offset(4);
390 show_in_offset(5);
391 limit_in_offset(5);
392 show_in_offset(6);
393 limit_in_offset(6);
394 show_in_offset(7);
395 limit_in_offset(7);
396 show_in_offset(8);
397
398 /* 3 temperatures */
399 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
400                 char *buf)
401 {
402         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
403         int nr = sensor_attr->index;
404
405         struct it87_data *data = it87_update_device(dev);
406         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
407 }
408 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
409                 char *buf)
410 {
411         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
412         int nr = sensor_attr->index;
413
414         struct it87_data *data = it87_update_device(dev);
415         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
416 }
417 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
418                 char *buf)
419 {
420         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
421         int nr = sensor_attr->index;
422
423         struct it87_data *data = it87_update_device(dev);
424         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
425 }
426 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
427                 const char *buf, size_t count)
428 {
429         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
430         int nr = sensor_attr->index;
431
432         struct it87_data *data = dev_get_drvdata(dev);
433         int val = simple_strtol(buf, NULL, 10);
434
435         mutex_lock(&data->update_lock);
436         data->temp_high[nr] = TEMP_TO_REG(val);
437         it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
438         mutex_unlock(&data->update_lock);
439         return count;
440 }
441 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
442                 const char *buf, size_t count)
443 {
444         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
445         int nr = sensor_attr->index;
446
447         struct it87_data *data = dev_get_drvdata(dev);
448         int val = simple_strtol(buf, NULL, 10);
449
450         mutex_lock(&data->update_lock);
451         data->temp_low[nr] = TEMP_TO_REG(val);
452         it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
453         mutex_unlock(&data->update_lock);
454         return count;
455 }
456 #define show_temp_offset(offset)                                        \
457 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
458                 show_temp, NULL, offset - 1);                           \
459 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
460                 show_temp_max, set_temp_max, offset - 1);               \
461 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR,        \
462                 show_temp_min, set_temp_min, offset - 1);
463
464 show_temp_offset(1);
465 show_temp_offset(2);
466 show_temp_offset(3);
467
468 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
469                 char *buf)
470 {
471         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
472         int nr = sensor_attr->index;
473
474         struct it87_data *data = it87_update_device(dev);
475         u8 reg = data->sensor; /* In case the value is updated while we use it */
476         
477         if (reg & (1 << nr))
478                 return sprintf(buf, "3\n");  /* thermal diode */
479         if (reg & (8 << nr))
480                 return sprintf(buf, "2\n");  /* thermistor */
481         return sprintf(buf, "0\n");      /* disabled */
482 }
483 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
484                 const char *buf, size_t count)
485 {
486         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
487         int nr = sensor_attr->index;
488
489         struct it87_data *data = dev_get_drvdata(dev);
490         int val = simple_strtol(buf, NULL, 10);
491
492         mutex_lock(&data->update_lock);
493
494         data->sensor &= ~(1 << nr);
495         data->sensor &= ~(8 << nr);
496         /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
497         if (val == 3)
498             data->sensor |= 1 << nr;
499         else if (val == 2)
500             data->sensor |= 8 << nr;
501         else if (val != 0) {
502                 mutex_unlock(&data->update_lock);
503                 return -EINVAL;
504         }
505         it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
506         mutex_unlock(&data->update_lock);
507         return count;
508 }
509 #define show_sensor_offset(offset)                                      \
510 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR,       \
511                 show_sensor, set_sensor, offset - 1);
512
513 show_sensor_offset(1);
514 show_sensor_offset(2);
515 show_sensor_offset(3);
516
517 /* 3 Fans */
518 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
519                 char *buf)
520 {
521         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
522         int nr = sensor_attr->index;
523
524         struct it87_data *data = it87_update_device(dev);
525         return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr], 
526                                 DIV_FROM_REG(data->fan_div[nr])));
527 }
528 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
529                 char *buf)
530 {
531         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
532         int nr = sensor_attr->index;
533
534         struct it87_data *data = it87_update_device(dev);
535         return sprintf(buf,"%d\n",
536                 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
537 }
538 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
539                 char *buf)
540 {
541         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
542         int nr = sensor_attr->index;
543
544         struct it87_data *data = it87_update_device(dev);
545         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
546 }
547 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
548                 char *buf)
549 {
550         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
551         int nr = sensor_attr->index;
552
553         struct it87_data *data = it87_update_device(dev);
554         return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
555 }
556 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
557                 char *buf)
558 {
559         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
560         int nr = sensor_attr->index;
561
562         struct it87_data *data = it87_update_device(dev);
563         return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
564 }
565 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
566                 char *buf)
567 {
568         struct it87_data *data = it87_update_device(dev);
569         int index = (data->fan_ctl >> 4) & 0x07;
570
571         return sprintf(buf, "%u\n", pwm_freq[index]);
572 }
573 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
574                 const char *buf, size_t count)
575 {
576         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
577         int nr = sensor_attr->index;
578
579         struct it87_data *data = dev_get_drvdata(dev);
580         int val = simple_strtol(buf, NULL, 10);
581         u8 reg;
582
583         mutex_lock(&data->update_lock);
584         reg = it87_read_value(data, IT87_REG_FAN_DIV);
585         switch (nr) {
586         case 0: data->fan_div[nr] = reg & 0x07; break;
587         case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
588         case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
589         }
590
591         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
592         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
593         mutex_unlock(&data->update_lock);
594         return count;
595 }
596 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
597                 const char *buf, size_t count)
598 {
599         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
600         int nr = sensor_attr->index;
601
602         struct it87_data *data = dev_get_drvdata(dev);
603         unsigned long val = simple_strtoul(buf, NULL, 10);
604         int min;
605         u8 old;
606
607         mutex_lock(&data->update_lock);
608         old = it87_read_value(data, IT87_REG_FAN_DIV);
609
610         /* Save fan min limit */
611         min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
612
613         switch (nr) {
614         case 0:
615         case 1:
616                 data->fan_div[nr] = DIV_TO_REG(val);
617                 break;
618         case 2:
619                 if (val < 8)
620                         data->fan_div[nr] = 1;
621                 else
622                         data->fan_div[nr] = 3;
623         }
624         val = old & 0x80;
625         val |= (data->fan_div[0] & 0x07);
626         val |= (data->fan_div[1] & 0x07) << 3;
627         if (data->fan_div[2] == 3)
628                 val |= 0x1 << 6;
629         it87_write_value(data, IT87_REG_FAN_DIV, val);
630
631         /* Restore fan min limit */
632         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
633         it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
634
635         mutex_unlock(&data->update_lock);
636         return count;
637 }
638 static ssize_t set_pwm_enable(struct device *dev,
639                 struct device_attribute *attr, const char *buf, size_t count)
640 {
641         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
642         int nr = sensor_attr->index;
643
644         struct it87_data *data = dev_get_drvdata(dev);
645         int val = simple_strtol(buf, NULL, 10);
646
647         mutex_lock(&data->update_lock);
648
649         if (val == 0) {
650                 int tmp;
651                 /* make sure the fan is on when in on/off mode */
652                 tmp = it87_read_value(data, IT87_REG_FAN_CTL);
653                 it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
654                 /* set on/off mode */
655                 data->fan_main_ctrl &= ~(1 << nr);
656                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
657         } else if (val == 1) {
658                 /* set SmartGuardian mode */
659                 data->fan_main_ctrl |= (1 << nr);
660                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
661                 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
662                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
663         } else {
664                 mutex_unlock(&data->update_lock);
665                 return -EINVAL;
666         }
667
668         mutex_unlock(&data->update_lock);
669         return count;
670 }
671 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
672                 const char *buf, size_t count)
673 {
674         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
675         int nr = sensor_attr->index;
676
677         struct it87_data *data = dev_get_drvdata(dev);
678         int val = simple_strtol(buf, NULL, 10);
679
680         if (val < 0 || val > 255)
681                 return -EINVAL;
682
683         mutex_lock(&data->update_lock);
684         data->manual_pwm_ctl[nr] = val;
685         if (data->fan_main_ctrl & (1 << nr))
686                 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
687         mutex_unlock(&data->update_lock);
688         return count;
689 }
690 static ssize_t set_pwm_freq(struct device *dev,
691                 struct device_attribute *attr, const char *buf, size_t count)
692 {
693         struct it87_data *data = dev_get_drvdata(dev);
694         unsigned long val = simple_strtoul(buf, NULL, 10);
695         int i;
696
697         /* Search for the nearest available frequency */
698         for (i = 0; i < 7; i++) {
699                 if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
700                         break;
701         }
702
703         mutex_lock(&data->update_lock);
704         data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
705         data->fan_ctl |= i << 4;
706         it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
707         mutex_unlock(&data->update_lock);
708
709         return count;
710 }
711
712 #define show_fan_offset(offset)                                 \
713 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
714                 show_fan, NULL, offset - 1);                    \
715 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
716                 show_fan_min, set_fan_min, offset - 1);         \
717 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
718                 show_fan_div, set_fan_div, offset - 1);
719
720 show_fan_offset(1);
721 show_fan_offset(2);
722 show_fan_offset(3);
723
724 #define show_pwm_offset(offset)                                         \
725 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,      \
726                 show_pwm_enable, set_pwm_enable, offset - 1);           \
727 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,               \
728                 show_pwm, set_pwm, offset - 1);                         \
729 static DEVICE_ATTR(pwm##offset##_freq,                                  \
730                 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),            \
731                 show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
732
733 show_pwm_offset(1);
734 show_pwm_offset(2);
735 show_pwm_offset(3);
736
737 /* A different set of callbacks for 16-bit fans */
738 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
739                 char *buf)
740 {
741         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
742         int nr = sensor_attr->index;
743         struct it87_data *data = it87_update_device(dev);
744         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
745 }
746
747 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
748                 char *buf)
749 {
750         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
751         int nr = sensor_attr->index;
752         struct it87_data *data = it87_update_device(dev);
753         return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
754 }
755
756 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
757                 const char *buf, size_t count)
758 {
759         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
760         int nr = sensor_attr->index;
761         struct it87_data *data = dev_get_drvdata(dev);
762         int val = simple_strtol(buf, NULL, 10);
763
764         mutex_lock(&data->update_lock);
765         data->fan_min[nr] = FAN16_TO_REG(val);
766         it87_write_value(data, IT87_REG_FAN_MIN[nr],
767                          data->fan_min[nr] & 0xff);
768         it87_write_value(data, IT87_REG_FANX_MIN[nr],
769                          data->fan_min[nr] >> 8);
770         mutex_unlock(&data->update_lock);
771         return count;
772 }
773
774 /* We want to use the same sysfs file names as 8-bit fans, but we need
775    different variable names, so we have to use SENSOR_ATTR instead of
776    SENSOR_DEVICE_ATTR. */
777 #define show_fan16_offset(offset) \
778 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
779         = SENSOR_ATTR(fan##offset##_input, S_IRUGO,             \
780                 show_fan16, NULL, offset - 1);                  \
781 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
782         = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,     \
783                 show_fan16_min, set_fan16_min, offset - 1)
784
785 show_fan16_offset(1);
786 show_fan16_offset(2);
787 show_fan16_offset(3);
788 show_fan16_offset(4);
789 show_fan16_offset(5);
790
791 /* Alarms */
792 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
793 {
794         struct it87_data *data = it87_update_device(dev);
795         return sprintf(buf, "%u\n", data->alarms);
796 }
797 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
798
799 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
800                 char *buf)
801 {
802         int bitnr = to_sensor_dev_attr(attr)->index;
803         struct it87_data *data = it87_update_device(dev);
804         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
805 }
806 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
807 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
808 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
809 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 11);
810 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 12);
811 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 13);
812 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 14);
813 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 15);
814 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 0);
815 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 1);
816 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 2);
817 static SENSOR_DEVICE_ATTR(fan4_alarm, S_IRUGO, show_alarm, NULL, 3);
818 static SENSOR_DEVICE_ATTR(fan5_alarm, S_IRUGO, show_alarm, NULL, 6);
819 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
820 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
821 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
822
823 static ssize_t
824 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
825 {
826         struct it87_data *data = dev_get_drvdata(dev);
827         return sprintf(buf, "%u\n", data->vrm);
828 }
829 static ssize_t
830 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
831 {
832         struct it87_data *data = dev_get_drvdata(dev);
833         u32 val;
834
835         val = simple_strtoul(buf, NULL, 10);
836         data->vrm = val;
837
838         return count;
839 }
840 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
841
842 static ssize_t
843 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
844 {
845         struct it87_data *data = it87_update_device(dev);
846         return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
847 }
848 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
849
850 static ssize_t show_name(struct device *dev, struct device_attribute
851                          *devattr, char *buf)
852 {
853         struct it87_data *data = dev_get_drvdata(dev);
854         return sprintf(buf, "%s\n", data->name);
855 }
856 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
857
858 static struct attribute *it87_attributes[] = {
859         &sensor_dev_attr_in0_input.dev_attr.attr,
860         &sensor_dev_attr_in1_input.dev_attr.attr,
861         &sensor_dev_attr_in2_input.dev_attr.attr,
862         &sensor_dev_attr_in3_input.dev_attr.attr,
863         &sensor_dev_attr_in4_input.dev_attr.attr,
864         &sensor_dev_attr_in5_input.dev_attr.attr,
865         &sensor_dev_attr_in6_input.dev_attr.attr,
866         &sensor_dev_attr_in7_input.dev_attr.attr,
867         &sensor_dev_attr_in8_input.dev_attr.attr,
868         &sensor_dev_attr_in0_min.dev_attr.attr,
869         &sensor_dev_attr_in1_min.dev_attr.attr,
870         &sensor_dev_attr_in2_min.dev_attr.attr,
871         &sensor_dev_attr_in3_min.dev_attr.attr,
872         &sensor_dev_attr_in4_min.dev_attr.attr,
873         &sensor_dev_attr_in5_min.dev_attr.attr,
874         &sensor_dev_attr_in6_min.dev_attr.attr,
875         &sensor_dev_attr_in7_min.dev_attr.attr,
876         &sensor_dev_attr_in0_max.dev_attr.attr,
877         &sensor_dev_attr_in1_max.dev_attr.attr,
878         &sensor_dev_attr_in2_max.dev_attr.attr,
879         &sensor_dev_attr_in3_max.dev_attr.attr,
880         &sensor_dev_attr_in4_max.dev_attr.attr,
881         &sensor_dev_attr_in5_max.dev_attr.attr,
882         &sensor_dev_attr_in6_max.dev_attr.attr,
883         &sensor_dev_attr_in7_max.dev_attr.attr,
884         &sensor_dev_attr_in0_alarm.dev_attr.attr,
885         &sensor_dev_attr_in1_alarm.dev_attr.attr,
886         &sensor_dev_attr_in2_alarm.dev_attr.attr,
887         &sensor_dev_attr_in3_alarm.dev_attr.attr,
888         &sensor_dev_attr_in4_alarm.dev_attr.attr,
889         &sensor_dev_attr_in5_alarm.dev_attr.attr,
890         &sensor_dev_attr_in6_alarm.dev_attr.attr,
891         &sensor_dev_attr_in7_alarm.dev_attr.attr,
892
893         &sensor_dev_attr_temp1_input.dev_attr.attr,
894         &sensor_dev_attr_temp2_input.dev_attr.attr,
895         &sensor_dev_attr_temp3_input.dev_attr.attr,
896         &sensor_dev_attr_temp1_max.dev_attr.attr,
897         &sensor_dev_attr_temp2_max.dev_attr.attr,
898         &sensor_dev_attr_temp3_max.dev_attr.attr,
899         &sensor_dev_attr_temp1_min.dev_attr.attr,
900         &sensor_dev_attr_temp2_min.dev_attr.attr,
901         &sensor_dev_attr_temp3_min.dev_attr.attr,
902         &sensor_dev_attr_temp1_type.dev_attr.attr,
903         &sensor_dev_attr_temp2_type.dev_attr.attr,
904         &sensor_dev_attr_temp3_type.dev_attr.attr,
905         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
906         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
907         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
908
909         &dev_attr_alarms.attr,
910         &dev_attr_name.attr,
911         NULL
912 };
913
914 static const struct attribute_group it87_group = {
915         .attrs = it87_attributes,
916 };
917
918 static struct attribute *it87_attributes_opt[] = {
919         &sensor_dev_attr_fan1_input16.dev_attr.attr,
920         &sensor_dev_attr_fan1_min16.dev_attr.attr,
921         &sensor_dev_attr_fan2_input16.dev_attr.attr,
922         &sensor_dev_attr_fan2_min16.dev_attr.attr,
923         &sensor_dev_attr_fan3_input16.dev_attr.attr,
924         &sensor_dev_attr_fan3_min16.dev_attr.attr,
925         &sensor_dev_attr_fan4_input16.dev_attr.attr,
926         &sensor_dev_attr_fan4_min16.dev_attr.attr,
927         &sensor_dev_attr_fan5_input16.dev_attr.attr,
928         &sensor_dev_attr_fan5_min16.dev_attr.attr,
929
930         &sensor_dev_attr_fan1_input.dev_attr.attr,
931         &sensor_dev_attr_fan1_min.dev_attr.attr,
932         &sensor_dev_attr_fan1_div.dev_attr.attr,
933         &sensor_dev_attr_fan2_input.dev_attr.attr,
934         &sensor_dev_attr_fan2_min.dev_attr.attr,
935         &sensor_dev_attr_fan2_div.dev_attr.attr,
936         &sensor_dev_attr_fan3_input.dev_attr.attr,
937         &sensor_dev_attr_fan3_min.dev_attr.attr,
938         &sensor_dev_attr_fan3_div.dev_attr.attr,
939
940         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
941         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
942         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
943         &sensor_dev_attr_fan4_alarm.dev_attr.attr,
944         &sensor_dev_attr_fan5_alarm.dev_attr.attr,
945
946         &sensor_dev_attr_pwm1_enable.dev_attr.attr,
947         &sensor_dev_attr_pwm2_enable.dev_attr.attr,
948         &sensor_dev_attr_pwm3_enable.dev_attr.attr,
949         &sensor_dev_attr_pwm1.dev_attr.attr,
950         &sensor_dev_attr_pwm2.dev_attr.attr,
951         &sensor_dev_attr_pwm3.dev_attr.attr,
952         &dev_attr_pwm1_freq.attr,
953         &dev_attr_pwm2_freq.attr,
954         &dev_attr_pwm3_freq.attr,
955
956         &dev_attr_vrm.attr,
957         &dev_attr_cpu0_vid.attr,
958         NULL
959 };
960
961 static const struct attribute_group it87_group_opt = {
962         .attrs = it87_attributes_opt,
963 };
964
965 /* SuperIO detection - will change isa_address if a chip is found */
966 static int __init it87_find(unsigned short *address,
967         struct it87_sio_data *sio_data)
968 {
969         int err = -ENODEV;
970         u16 chip_type;
971         const char *board_vendor, *board_name;
972
973         superio_enter();
974         chip_type = force_id ? force_id : superio_inw(DEVID);
975
976         switch (chip_type) {
977         case IT8705F_DEVID:
978                 sio_data->type = it87;
979                 break;
980         case IT8712F_DEVID:
981                 sio_data->type = it8712;
982                 break;
983         case IT8716F_DEVID:
984         case IT8726F_DEVID:
985                 sio_data->type = it8716;
986                 break;
987         case IT8718F_DEVID:
988                 sio_data->type = it8718;
989                 break;
990         case 0xffff:    /* No device at all */
991                 goto exit;
992         default:
993                 pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n",
994                          chip_type);
995                 goto exit;
996         }
997
998         superio_select(PME);
999         if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
1000                 pr_info("it87: Device not activated, skipping\n");
1001                 goto exit;
1002         }
1003
1004         *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
1005         if (*address == 0) {
1006                 pr_info("it87: Base address not set, skipping\n");
1007                 goto exit;
1008         }
1009
1010         err = 0;
1011         sio_data->revision = superio_inb(DEVREV) & 0x0f;
1012         pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
1013                 chip_type, *address, sio_data->revision);
1014
1015         /* Read GPIO config and VID value from LDN 7 (GPIO) */
1016         if (chip_type != IT8705F_DEVID) {
1017                 int reg;
1018
1019                 superio_select(GPIO);
1020                 if (chip_type == it8718)
1021                         sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
1022
1023                 reg = superio_inb(IT87_SIO_PINX2_REG);
1024                 if (reg & (1 << 0))
1025                         pr_info("it87: in3 is VCC (+5V)\n");
1026                 if (reg & (1 << 1))
1027                         pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
1028         }
1029
1030         /* Disable specific features based on DMI strings */
1031         board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
1032         board_name = dmi_get_system_info(DMI_BOARD_NAME);
1033         if (board_vendor && board_name) {
1034                 if (strcmp(board_vendor, "nVIDIA") == 0
1035                  && strcmp(board_name, "FN68PT") == 0) {
1036                         /* On the Shuttle SN68PT, FAN_CTL2 is apparently not
1037                            connected to a fan, but to something else. One user
1038                            has reported instant system power-off when changing
1039                            the PWM2 duty cycle, so we disable it.
1040                            I use the board name string as the trigger in case
1041                            the same board is ever used in other systems. */
1042                         pr_info("it87: Disabling pwm2 due to "
1043                                 "hardware constraints\n");
1044                         sio_data->skip_pwm = (1 << 1);
1045                 }
1046         }
1047
1048 exit:
1049         superio_exit();
1050         return err;
1051 }
1052
1053 static int __devinit it87_probe(struct platform_device *pdev)
1054 {
1055         struct it87_data *data;
1056         struct resource *res;
1057         struct device *dev = &pdev->dev;
1058         struct it87_sio_data *sio_data = dev->platform_data;
1059         int err = 0;
1060         int enable_pwm_interface;
1061         static const char *names[] = {
1062                 "it87",
1063                 "it8712",
1064                 "it8716",
1065                 "it8718",
1066         };
1067
1068         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
1069         if (!request_region(res->start, IT87_EC_EXTENT, DRVNAME)) {
1070                 dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
1071                         (unsigned long)res->start,
1072                         (unsigned long)(res->start + IT87_EC_EXTENT - 1));
1073                 err = -EBUSY;
1074                 goto ERROR0;
1075         }
1076
1077         if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
1078                 err = -ENOMEM;
1079                 goto ERROR1;
1080         }
1081
1082         data->addr = res->start;
1083         data->type = sio_data->type;
1084         data->revision = sio_data->revision;
1085         data->name = names[sio_data->type];
1086
1087         /* Now, we do the remaining detection. */
1088         if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
1089          || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {
1090                 err = -ENODEV;
1091                 goto ERROR2;
1092         }
1093
1094         platform_set_drvdata(pdev, data);
1095
1096         mutex_init(&data->update_lock);
1097
1098         /* Check PWM configuration */
1099         enable_pwm_interface = it87_check_pwm(dev);
1100
1101         /* Initialize the IT87 chip */
1102         it87_init_device(pdev);
1103
1104         /* Register sysfs hooks */
1105         if ((err = sysfs_create_group(&dev->kobj, &it87_group)))
1106                 goto ERROR2;
1107
1108         /* Do not create fan files for disabled fans */
1109         if (has_16bit_fans(data)) {
1110                 /* 16-bit tachometers */
1111                 if (data->has_fan & (1 << 0)) {
1112                         if ((err = device_create_file(dev,
1113                              &sensor_dev_attr_fan1_input16.dev_attr))
1114                          || (err = device_create_file(dev,
1115                              &sensor_dev_attr_fan1_min16.dev_attr))
1116                          || (err = device_create_file(dev,
1117                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1118                                 goto ERROR4;
1119                 }
1120                 if (data->has_fan & (1 << 1)) {
1121                         if ((err = device_create_file(dev,
1122                              &sensor_dev_attr_fan2_input16.dev_attr))
1123                          || (err = device_create_file(dev,
1124                              &sensor_dev_attr_fan2_min16.dev_attr))
1125                          || (err = device_create_file(dev,
1126                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1127                                 goto ERROR4;
1128                 }
1129                 if (data->has_fan & (1 << 2)) {
1130                         if ((err = device_create_file(dev,
1131                              &sensor_dev_attr_fan3_input16.dev_attr))
1132                          || (err = device_create_file(dev,
1133                              &sensor_dev_attr_fan3_min16.dev_attr))
1134                          || (err = device_create_file(dev,
1135                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1136                                 goto ERROR4;
1137                 }
1138                 if (data->has_fan & (1 << 3)) {
1139                         if ((err = device_create_file(dev,
1140                              &sensor_dev_attr_fan4_input16.dev_attr))
1141                          || (err = device_create_file(dev,
1142                              &sensor_dev_attr_fan4_min16.dev_attr))
1143                          || (err = device_create_file(dev,
1144                              &sensor_dev_attr_fan4_alarm.dev_attr)))
1145                                 goto ERROR4;
1146                 }
1147                 if (data->has_fan & (1 << 4)) {
1148                         if ((err = device_create_file(dev,
1149                              &sensor_dev_attr_fan5_input16.dev_attr))
1150                          || (err = device_create_file(dev,
1151                              &sensor_dev_attr_fan5_min16.dev_attr))
1152                          || (err = device_create_file(dev,
1153                              &sensor_dev_attr_fan5_alarm.dev_attr)))
1154                                 goto ERROR4;
1155                 }
1156         } else {
1157                 /* 8-bit tachometers with clock divider */
1158                 if (data->has_fan & (1 << 0)) {
1159                         if ((err = device_create_file(dev,
1160                              &sensor_dev_attr_fan1_input.dev_attr))
1161                          || (err = device_create_file(dev,
1162                              &sensor_dev_attr_fan1_min.dev_attr))
1163                          || (err = device_create_file(dev,
1164                              &sensor_dev_attr_fan1_div.dev_attr))
1165                          || (err = device_create_file(dev,
1166                              &sensor_dev_attr_fan1_alarm.dev_attr)))
1167                                 goto ERROR4;
1168                 }
1169                 if (data->has_fan & (1 << 1)) {
1170                         if ((err = device_create_file(dev,
1171                              &sensor_dev_attr_fan2_input.dev_attr))
1172                          || (err = device_create_file(dev,
1173                              &sensor_dev_attr_fan2_min.dev_attr))
1174                          || (err = device_create_file(dev,
1175                              &sensor_dev_attr_fan2_div.dev_attr))
1176                          || (err = device_create_file(dev,
1177                              &sensor_dev_attr_fan2_alarm.dev_attr)))
1178                                 goto ERROR4;
1179                 }
1180                 if (data->has_fan & (1 << 2)) {
1181                         if ((err = device_create_file(dev,
1182                              &sensor_dev_attr_fan3_input.dev_attr))
1183                          || (err = device_create_file(dev,
1184                              &sensor_dev_attr_fan3_min.dev_attr))
1185                          || (err = device_create_file(dev,
1186                              &sensor_dev_attr_fan3_div.dev_attr))
1187                          || (err = device_create_file(dev,
1188                              &sensor_dev_attr_fan3_alarm.dev_attr)))
1189                                 goto ERROR4;
1190                 }
1191         }
1192
1193         if (enable_pwm_interface) {
1194                 if (!(sio_data->skip_pwm & (1 << 0))) {
1195                         if ((err = device_create_file(dev,
1196                              &sensor_dev_attr_pwm1_enable.dev_attr))
1197                          || (err = device_create_file(dev,
1198                              &sensor_dev_attr_pwm1.dev_attr))
1199                          || (err = device_create_file(dev,
1200                              &dev_attr_pwm1_freq)))
1201                                 goto ERROR4;
1202                 }
1203                 if (!(sio_data->skip_pwm & (1 << 1))) {
1204                         if ((err = device_create_file(dev,
1205                              &sensor_dev_attr_pwm2_enable.dev_attr))
1206                          || (err = device_create_file(dev,
1207                              &sensor_dev_attr_pwm2.dev_attr))
1208                          || (err = device_create_file(dev,
1209                              &dev_attr_pwm2_freq)))
1210                                 goto ERROR4;
1211                 }
1212                 if (!(sio_data->skip_pwm & (1 << 2))) {
1213                         if ((err = device_create_file(dev,
1214                              &sensor_dev_attr_pwm3_enable.dev_attr))
1215                          || (err = device_create_file(dev,
1216                              &sensor_dev_attr_pwm3.dev_attr))
1217                          || (err = device_create_file(dev,
1218                              &dev_attr_pwm3_freq)))
1219                                 goto ERROR4;
1220                 }
1221         }
1222
1223         if (data->type == it8712 || data->type == it8716
1224          || data->type == it8718) {
1225                 data->vrm = vid_which_vrm();
1226                 /* VID reading from Super-I/O config space if available */
1227                 data->vid = sio_data->vid_value;
1228                 if ((err = device_create_file(dev,
1229                      &dev_attr_vrm))
1230                  || (err = device_create_file(dev,
1231                      &dev_attr_cpu0_vid)))
1232                         goto ERROR4;
1233         }
1234
1235         data->hwmon_dev = hwmon_device_register(dev);
1236         if (IS_ERR(data->hwmon_dev)) {
1237                 err = PTR_ERR(data->hwmon_dev);
1238                 goto ERROR4;
1239         }
1240
1241         return 0;
1242
1243 ERROR4:
1244         sysfs_remove_group(&dev->kobj, &it87_group);
1245         sysfs_remove_group(&dev->kobj, &it87_group_opt);
1246 ERROR2:
1247         platform_set_drvdata(pdev, NULL);
1248         kfree(data);
1249 ERROR1:
1250         release_region(res->start, IT87_EC_EXTENT);
1251 ERROR0:
1252         return err;
1253 }
1254
1255 static int __devexit it87_remove(struct platform_device *pdev)
1256 {
1257         struct it87_data *data = platform_get_drvdata(pdev);
1258
1259         hwmon_device_unregister(data->hwmon_dev);
1260         sysfs_remove_group(&pdev->dev.kobj, &it87_group);
1261         sysfs_remove_group(&pdev->dev.kobj, &it87_group_opt);
1262
1263         release_region(data->addr, IT87_EC_EXTENT);
1264         platform_set_drvdata(pdev, NULL);
1265         kfree(data);
1266
1267         return 0;
1268 }
1269
1270 /* Must be called with data->update_lock held, except during initialization.
1271    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1272    would slow down the IT87 access and should not be necessary. */
1273 static int it87_read_value(struct it87_data *data, u8 reg)
1274 {
1275         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1276         return inb_p(data->addr + IT87_DATA_REG_OFFSET);
1277 }
1278
1279 /* Must be called with data->update_lock held, except during initialization.
1280    We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1281    would slow down the IT87 access and should not be necessary. */
1282 static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
1283 {
1284         outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1285         outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
1286 }
1287
1288 /* Return 1 if and only if the PWM interface is safe to use */
1289 static int __devinit it87_check_pwm(struct device *dev)
1290 {
1291         struct it87_data *data = dev_get_drvdata(dev);
1292         /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1293          * and polarity set to active low is sign that this is the case so we
1294          * disable pwm control to protect the user. */
1295         int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
1296         if ((tmp & 0x87) == 0) {
1297                 if (fix_pwm_polarity) {
1298                         /* The user asks us to attempt a chip reconfiguration.
1299                          * This means switching to active high polarity and
1300                          * inverting all fan speed values. */
1301                         int i;
1302                         u8 pwm[3];
1303
1304                         for (i = 0; i < 3; i++)
1305                                 pwm[i] = it87_read_value(data,
1306                                                          IT87_REG_PWM(i));
1307
1308                         /* If any fan is in automatic pwm mode, the polarity
1309                          * might be correct, as suspicious as it seems, so we
1310                          * better don't change anything (but still disable the
1311                          * PWM interface). */
1312                         if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1313                                 dev_info(dev, "Reconfiguring PWM to "
1314                                          "active high polarity\n");
1315                                 it87_write_value(data, IT87_REG_FAN_CTL,
1316                                                  tmp | 0x87);
1317                                 for (i = 0; i < 3; i++)
1318                                         it87_write_value(data,
1319                                                          IT87_REG_PWM(i),
1320                                                          0x7f & ~pwm[i]);
1321                                 return 1;
1322                         }
1323
1324                         dev_info(dev, "PWM configuration is "
1325                                  "too broken to be fixed\n");
1326                 }
1327
1328                 dev_info(dev, "Detected broken BIOS "
1329                          "defaults, disabling PWM interface\n");
1330                 return 0;
1331         } else if (fix_pwm_polarity) {
1332                 dev_info(dev, "PWM configuration looks "
1333                          "sane, won't touch\n");
1334         }
1335
1336         return 1;
1337 }
1338
1339 /* Called when we have found a new IT87. */
1340 static void __devinit it87_init_device(struct platform_device *pdev)
1341 {
1342         struct it87_data *data = platform_get_drvdata(pdev);
1343         int tmp, i;
1344
1345         /* initialize to sane defaults:
1346          * - if the chip is in manual pwm mode, this will be overwritten with
1347          *   the actual settings on the chip (so in this case, initialization
1348          *   is not needed)
1349          * - if in automatic or on/off mode, we could switch to manual mode,
1350          *   read the registers and set manual_pwm_ctl accordingly, but currently
1351          *   this is not implemented, so we initialize to something sane */
1352         for (i = 0; i < 3; i++) {
1353                 data->manual_pwm_ctl[i] = 0xff;
1354         }
1355
1356         /* Some chips seem to have default value 0xff for all limit
1357          * registers. For low voltage limits it makes no sense and triggers
1358          * alarms, so change to 0 instead. For high temperature limits, it
1359          * means -1 degree C, which surprisingly doesn't trigger an alarm,
1360          * but is still confusing, so change to 127 degrees C. */
1361         for (i = 0; i < 8; i++) {
1362                 tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
1363                 if (tmp == 0xff)
1364                         it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
1365         }
1366         for (i = 0; i < 3; i++) {
1367                 tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1368                 if (tmp == 0xff)
1369                         it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
1370         }
1371
1372         /* Check if temperature channnels are reset manually or by some reason */
1373         tmp = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1374         if ((tmp & 0x3f) == 0) {
1375                 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1376                 tmp = (tmp & 0xc0) | 0x2a;
1377                 it87_write_value(data, IT87_REG_TEMP_ENABLE, tmp);
1378         }
1379         data->sensor = tmp;
1380
1381         /* Check if voltage monitors are reset manually or by some reason */
1382         tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
1383         if ((tmp & 0xff) == 0) {
1384                 /* Enable all voltage monitors */
1385                 it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
1386         }
1387
1388         /* Check if tachometers are reset manually or by some reason */
1389         data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
1390         if ((data->fan_main_ctrl & 0x70) == 0) {
1391                 /* Enable all fan tachometers */
1392                 data->fan_main_ctrl |= 0x70;
1393                 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1394         }
1395         data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1396
1397         /* Set tachometers to 16-bit mode if needed */
1398         if (has_16bit_fans(data)) {
1399                 tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
1400                 if (~tmp & 0x07 & data->has_fan) {
1401                         dev_dbg(&pdev->dev,
1402                                 "Setting fan1-3 to 16-bit mode\n");
1403                         it87_write_value(data, IT87_REG_FAN_16BIT,
1404                                          tmp | 0x07);
1405                 }
1406                 /* IT8705F only supports three fans. */
1407                 if (data->type != it87) {
1408                         if (tmp & (1 << 4))
1409                                 data->has_fan |= (1 << 3); /* fan4 enabled */
1410                         if (tmp & (1 << 5))
1411                                 data->has_fan |= (1 << 4); /* fan5 enabled */
1412                 }
1413         }
1414
1415         /* Set current fan mode registers and the default settings for the
1416          * other mode registers */
1417         for (i = 0; i < 3; i++) {
1418                 if (data->fan_main_ctrl & (1 << i)) {
1419                         /* pwm mode */
1420                         tmp = it87_read_value(data, IT87_REG_PWM(i));
1421                         if (tmp & 0x80) {
1422                                 /* automatic pwm - not yet implemented, but
1423                                  * leave the settings made by the BIOS alone
1424                                  * until a change is requested via the sysfs
1425                                  * interface */
1426                         } else {
1427                                 /* manual pwm */
1428                                 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1429                         }
1430                 }
1431         }
1432
1433         /* Start monitoring */
1434         it87_write_value(data, IT87_REG_CONFIG,
1435                          (it87_read_value(data, IT87_REG_CONFIG) & 0x36)
1436                          | (update_vbat ? 0x41 : 0x01));
1437 }
1438
1439 static struct it87_data *it87_update_device(struct device *dev)
1440 {
1441         struct it87_data *data = dev_get_drvdata(dev);
1442         int i;
1443
1444         mutex_lock(&data->update_lock);
1445
1446         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1447             || !data->valid) {
1448
1449                 if (update_vbat) {
1450                         /* Cleared after each update, so reenable.  Value
1451                           returned by this read will be previous value */       
1452                         it87_write_value(data, IT87_REG_CONFIG,
1453                            it87_read_value(data, IT87_REG_CONFIG) | 0x40);
1454                 }
1455                 for (i = 0; i <= 7; i++) {
1456                         data->in[i] =
1457                             it87_read_value(data, IT87_REG_VIN(i));
1458                         data->in_min[i] =
1459                             it87_read_value(data, IT87_REG_VIN_MIN(i));
1460                         data->in_max[i] =
1461                             it87_read_value(data, IT87_REG_VIN_MAX(i));
1462                 }
1463                 /* in8 (battery) has no limit registers */
1464                 data->in[8] =
1465                     it87_read_value(data, IT87_REG_VIN(8));
1466
1467                 for (i = 0; i < 5; i++) {
1468                         /* Skip disabled fans */
1469                         if (!(data->has_fan & (1 << i)))
1470                                 continue;
1471
1472                         data->fan_min[i] =
1473                             it87_read_value(data, IT87_REG_FAN_MIN[i]);
1474                         data->fan[i] = it87_read_value(data,
1475                                        IT87_REG_FAN[i]);
1476                         /* Add high byte if in 16-bit mode */
1477                         if (has_16bit_fans(data)) {
1478                                 data->fan[i] |= it87_read_value(data,
1479                                                 IT87_REG_FANX[i]) << 8;
1480                                 data->fan_min[i] |= it87_read_value(data,
1481                                                 IT87_REG_FANX_MIN[i]) << 8;
1482                         }
1483                 }
1484                 for (i = 0; i < 3; i++) {
1485                         data->temp[i] =
1486                             it87_read_value(data, IT87_REG_TEMP(i));
1487                         data->temp_high[i] =
1488                             it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1489                         data->temp_low[i] =
1490                             it87_read_value(data, IT87_REG_TEMP_LOW(i));
1491                 }
1492
1493                 /* Newer chips don't have clock dividers */
1494                 if ((data->has_fan & 0x07) && !has_16bit_fans(data)) {
1495                         i = it87_read_value(data, IT87_REG_FAN_DIV);
1496                         data->fan_div[0] = i & 0x07;
1497                         data->fan_div[1] = (i >> 3) & 0x07;
1498                         data->fan_div[2] = (i & 0x40) ? 3 : 1;
1499                 }
1500
1501                 data->alarms =
1502                         it87_read_value(data, IT87_REG_ALARM1) |
1503                         (it87_read_value(data, IT87_REG_ALARM2) << 8) |
1504                         (it87_read_value(data, IT87_REG_ALARM3) << 16);
1505                 data->fan_main_ctrl = it87_read_value(data,
1506                                 IT87_REG_FAN_MAIN_CTRL);
1507                 data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
1508
1509                 data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1510                 /* The 8705 does not have VID capability.
1511                    The 8718 does not use IT87_REG_VID for the same purpose. */
1512                 if (data->type == it8712 || data->type == it8716) {
1513                         data->vid = it87_read_value(data, IT87_REG_VID);
1514                         /* The older IT8712F revisions had only 5 VID pins,
1515                            but we assume it is always safe to read 6 bits. */
1516                         data->vid &= 0x3f;
1517                 }
1518                 data->last_updated = jiffies;
1519                 data->valid = 1;
1520         }
1521
1522         mutex_unlock(&data->update_lock);
1523
1524         return data;
1525 }
1526
1527 static int __init it87_device_add(unsigned short address,
1528                                   const struct it87_sio_data *sio_data)
1529 {
1530         struct resource res = {
1531                 .start  = address + IT87_EC_OFFSET,
1532                 .end    = address + IT87_EC_OFFSET + IT87_EC_EXTENT - 1,
1533                 .name   = DRVNAME,
1534                 .flags  = IORESOURCE_IO,
1535         };
1536         int err;
1537
1538         pdev = platform_device_alloc(DRVNAME, address);
1539         if (!pdev) {
1540                 err = -ENOMEM;
1541                 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
1542                 goto exit;
1543         }
1544
1545         err = platform_device_add_resources(pdev, &res, 1);
1546         if (err) {
1547                 printk(KERN_ERR DRVNAME ": Device resource addition failed "
1548                        "(%d)\n", err);
1549                 goto exit_device_put;
1550         }
1551
1552         err = platform_device_add_data(pdev, sio_data,
1553                                        sizeof(struct it87_sio_data));
1554         if (err) {
1555                 printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
1556                 goto exit_device_put;
1557         }
1558
1559         err = platform_device_add(pdev);
1560         if (err) {
1561                 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
1562                        err);
1563                 goto exit_device_put;
1564         }
1565
1566         return 0;
1567
1568 exit_device_put:
1569         platform_device_put(pdev);
1570 exit:
1571         return err;
1572 }
1573
1574 static int __init sm_it87_init(void)
1575 {
1576         int err;
1577         unsigned short isa_address=0;
1578         struct it87_sio_data sio_data;
1579
1580         memset(&sio_data, 0, sizeof(struct it87_sio_data));
1581         err = it87_find(&isa_address, &sio_data);
1582         if (err)
1583                 return err;
1584         err = platform_driver_register(&it87_driver);
1585         if (err)
1586                 return err;
1587
1588         err = it87_device_add(isa_address, &sio_data);
1589         if (err){
1590                 platform_driver_unregister(&it87_driver);
1591                 return err;
1592         }
1593
1594         return 0;
1595 }
1596
1597 static void __exit sm_it87_exit(void)
1598 {
1599         platform_device_unregister(pdev);
1600         platform_driver_unregister(&it87_driver);
1601 }
1602
1603
1604 MODULE_AUTHOR("Chris Gauthron, "
1605               "Jean Delvare <khali@linux-fr.org>");
1606 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8726F, SiS950 driver");
1607 module_param(update_vbat, bool, 0);
1608 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1609 module_param(fix_pwm_polarity, bool, 0);
1610 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1611 MODULE_LICENSE("GPL");
1612
1613 module_init(sm_it87_init);
1614 module_exit(sm_it87_exit);