1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
|
/*
* pc87427.c - hardware monitoring driver for the
* National Semiconductor PC87427 Super-I/O chip
* Copyright (C) 2006 Jean Delvare <khali@linux-fr.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Supports the following chips:
*
* Chip #vin #fan #pwm #temp devid
* PC87427 - 8 - - 0xF2
*
* This driver assumes that no more than one chip is present.
* Only fan inputs are supported so far, although the chip can do much more.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/io.h>
static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
static struct platform_device *pdev;
#define DRVNAME "pc87427"
/* The lock mutex protects both the I/O accesses (needed because the
device is using banked registers) and the register cache (needed to keep
the data in the registers and the cache in sync at any time). */
struct pc87427_data {
struct device *hwmon_dev;
struct mutex lock;
int address[2];
const char *name;
unsigned long last_updated; /* in jiffies */
u8 fan_enabled; /* bit vector */
u16 fan[8]; /* register values */
u16 fan_min[8]; /* register values */
u8 fan_status[8]; /* register values */
};
/*
* Super-I/O registers and operations
*/
#define SIOREG_LDSEL 0x07 /* Logical device select */
#define SIOREG_DEVID 0x20 /* Device ID */
#define SIOREG_ACT 0x30 /* Device activation */
#define SIOREG_MAP 0x50 /* I/O or memory mapping */
#define SIOREG_IOBASE 0x60 /* I/O base address */
static const u8 logdev[2] = { 0x09, 0x14 };
static const char *logdev_str[2] = { DRVNAME " FMC", DRVNAME " HMC" };
#define LD_FAN 0
#define LD_IN 1
#define LD_TEMP 1
static inline void superio_outb(int sioaddr, int reg, int val)
{
outb(reg, sioaddr);
outb(val, sioaddr + 1);
}
static inline int superio_inb(int sioaddr, int reg)
{
outb(reg, sioaddr);
return inb(sioaddr + 1);
}
static inline void superio_exit(int sioaddr)
{
outb(0x02, sioaddr);
outb(0x02, sioaddr + 1);
}
/*
* Logical devices
*/
#define REGION_LENGTH 32
#define PC87427_REG_BANK 0x0f
#define BANK_FM(nr) (nr)
#define BANK_FT(nr) (0x08 + (nr))
#define BANK_FC(nr) (0x10 + (nr) * 2)
/*
* I/O access functions
*/
/* ldi is the logical device index */
static inline int pc87427_read8(struct pc87427_data *data, u8 ldi, u8 reg)
{
return inb(data->address[ldi] + reg);
}
/* Must be called with data->lock held, except during init */
static inline int pc87427_read8_bank(struct pc87427_data *data, u8 ldi,
u8 bank, u8 reg)
{
outb(bank, data->address[ldi] + PC87427_REG_BANK);
return inb(data->address[ldi] + reg);
}
/* Must be called with data->lock held, except during init */
static inline void pc87427_write8_bank(struct pc87427_data *data, u8 ldi,
u8 bank, u8 reg, u8 value)
{
outb(bank, data->address[ldi] + PC87427_REG_BANK);
outb(value, data->address[ldi] + reg);
}
/*
* Fan registers and conversions
*/
/* fan data registers are 16-bit wide */
#define PC87427_REG_FAN 0x12
#define PC87427_REG_FAN_MIN 0x14
#define PC87427_REG_FAN_STATUS 0x10
#define FAN_STATUS_STALL (1 << 3)
#define FAN_STATUS_LOSPD (1 << 1)
#define FAN_STATUS_MONEN (1 << 0)
/* Dedicated function to read all registers related to a given fan input.
This saves us quite a few locks and bank selections.
Must be called with data->lock held.
nr is from 0 to 7 */
static void pc87427_readall_fan(struct pc87427_data *data, u8 nr)
{
int iobase = data->address[LD_FAN];
outb(BANK_FM(nr), iobase + PC87427_REG_BANK);
data->fan[nr] = inw(iobase + PC87427_REG_FAN);
data->fan_min[nr] = inw(iobase + PC87427_REG_FAN_MIN);
data->fan_status[nr] = inb(iobase + PC87427_REG_FAN_STATUS);
/* Clear fan alarm bits */
outb(data->fan_status[nr], iobase + PC87427_REG_FAN_STATUS);
}
/* The 2 LSB of fan speed registers are used for something different.
The actual 2 LSB of the measurements are not available. */
static inline unsigned long fan_from_reg(u16 reg)
{
reg &= 0xfffc;
if (reg == 0x0000 || reg == 0xfffc)
return 0;
return 5400000UL / reg;
}
/* The 2 LSB of the fan speed limit registers are not significant. */
static inline u16 fan_to_reg(unsigned long val)
{
if (val < 83UL)
return 0xffff;
if (val >= 1350000UL)
return 0x0004;
return ((1350000UL + val / 2) / val) << 2;
}
/*
* Data interface
*/
static struct pc87427_data *pc87427_update_device(struct device *dev)
{
struct pc87427_data *data = dev_get_drvdata(dev);
int i;
mutex_lock(&data->lock);
if (!time_after(jiffies, data->last_updated + HZ)
&& data->last_updated)
goto done;
/* Fans */
for (i = 0; i < 8; i++) {
if (!(data->fan_enabled & (1 << i)))
continue;
pc87427_readall_fan(data, i);
}
data->last_updated = jiffies;
done:
mutex_unlock(&data->lock);
return data;
}
static ssize_t show_fan_input(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct pc87427_data *data = pc87427_update_device(dev);
int nr = attr->index;
return sprintf(buf, "%lu\n", fan_from_reg(data->fan[nr]));
}
static ssize_t show_fan_min(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct pc87427_data *data = pc87427_update_device(dev);
int nr = attr->index;
return sprintf(buf, "%lu\n", fan_from_reg(data->fan_min[nr]));
}
static ssize_t show_fan_alarm(struct device *dev, struct device_attribute
*devattr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct pc87427_data *data = pc87427_update_device(dev);
int nr = attr->index;
return sprintf<
|