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RTCs: handle NVRAM better
[wrt350n-kernel.git] / drivers / hwmon / it87.c
blob6a182e14cf589d59f7a5d8e244b8aa9c34c0409d
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
7 IT8716F Super I/O chip w/LPC interface
8 IT8718F Super I/O chip w/LPC interface
9 IT8726F Super I/O chip w/LPC interface
10 Sis950 A clone of the IT8705F
11
12 Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com>
13 Copyright (C) 2005-2006 Jean Delvare <khali@linux-fr.org>
14
15 This program is free software; you can redistribute it and/or modify
16 it under the terms of the GNU General Public License as published by
17 the Free Software Foundation; either version 2 of the License, or
18 (at your option) any later version.
19
20 This program is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
24
25 You should have received a copy of the GNU General Public License
26 along with this program; if not, write to the Free Software
27 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 */
29
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/slab.h>
33 #include <linux/jiffies.h>
34 #include <linux/platform_device.h>
35 #include <linux/hwmon.h>
36 #include <linux/hwmon-sysfs.h>
37 #include <linux/hwmon-vid.h>
38 #include <linux/err.h>
39 #include <linux/mutex.h>
40 #include <linux/sysfs.h>
41 #include <asm/io.h>
42
43 #define DRVNAME "it87"
44
45 enum chips { it87, it8712, it8716, it8718 };
46
47 static struct platform_device *pdev;
48
49 #define REG 0x2e /* The register to read/write */
50 #define DEV 0x07 /* Register: Logical device select */
51 #define VAL 0x2f /* The value to read/write */
52 #define PME 0x04 /* The device with the fan registers in it */
53 #define GPIO 0x07 /* The device with the IT8718F VID value in it */
54 #define DEVID 0x20 /* Register: Device ID */
55 #define DEVREV 0x22 /* Register: Device Revision */
56
57 static inline int
58 superio_inb(int reg)
59 {
60 outb(reg, REG);
61 return inb(VAL);
62 }
63
64 static int superio_inw(int reg)
65 {
66 int val;
67 outb(reg++, REG);
68 val = inb(VAL) << 8;
69 outb(reg, REG);
70 val |= inb(VAL);
71 return val;
72 }
73
74 static inline void
75 superio_select(int ldn)
76 {
77 outb(DEV, REG);
78 outb(ldn, VAL);
79 }
80
81 static inline void
82 superio_enter(void)
83 {
84 outb(0x87, REG);
85 outb(0x01, REG);
86 outb(0x55, REG);
87 outb(0x55, REG);
88 }
89
90 static inline void
91 superio_exit(void)
92 {
93 outb(0x02, REG);
94 outb(0x02, VAL);
95 }
96
97 /* Logical device 4 registers */
98 #define IT8712F_DEVID 0x8712
99 #define IT8705F_DEVID 0x8705
100 #define IT8716F_DEVID 0x8716
101 #define IT8718F_DEVID 0x8718
102 #define IT8726F_DEVID 0x8726
103 #define IT87_ACT_REG 0x30
104 #define IT87_BASE_REG 0x60
105
106 /* Logical device 7 registers (IT8712F and later) */
107 #define IT87_SIO_PINX2_REG 0x2c /* Pin selection */
108 #define IT87_SIO_VID_REG 0xfc /* VID value */
109
110 /* Update battery voltage after every reading if true */
111 static int update_vbat;
112
113 /* Not all BIOSes properly configure the PWM registers */
114 static int fix_pwm_polarity;
115
116 /* Many IT87 constants specified below */
117
118 /* Length of ISA address segment */
119 #define IT87_EXTENT 8
120
121 /* Where are the ISA address/data registers relative to the base address */
122 #define IT87_ADDR_REG_OFFSET 5
123 #define IT87_DATA_REG_OFFSET 6
124
125 /*----- The IT87 registers -----*/
126
127 #define IT87_REG_CONFIG 0x00
128
129 #define IT87_REG_ALARM1 0x01
130 #define IT87_REG_ALARM2 0x02
131 #define IT87_REG_ALARM3 0x03
132
133 /* The IT8718F has the VID value in a different register, in Super-I/O
134 configuration space. */
135 #define IT87_REG_VID 0x0a
136 /* Warning: register 0x0b is used for something completely different in
137 new chips/revisions. I suspect only 16-bit tachometer mode will work
138 for these. */
139 #define IT87_REG_FAN_DIV 0x0b
140 #define IT87_REG_FAN_16BIT 0x0c
141
142 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
143
144 static const u8 IT87_REG_FAN[] = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
145 static const u8 IT87_REG_FAN_MIN[] = { 0x10, 0x11, 0x12, 0x84, 0x86 };
146 static const u8 IT87_REG_FANX[] = { 0x18, 0x19, 0x1a, 0x81, 0x83 };
147 static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
148 #define IT87_REG_FAN_MAIN_CTRL 0x13
149 #define IT87_REG_FAN_CTL 0x14
150 #define IT87_REG_PWM(nr) (0x15 + (nr))
151
152 #define IT87_REG_VIN(nr) (0x20 + (nr))
153 #define IT87_REG_TEMP(nr) (0x29 + (nr))
154
155 #define IT87_REG_VIN_MAX(nr) (0x30 + (nr) * 2)
156 #define IT87_REG_VIN_MIN(nr) (0x31 + (nr) * 2)
157 #define IT87_REG_TEMP_HIGH(nr) (0x40 + (nr) * 2)
158 #define IT87_REG_TEMP_LOW(nr) (0x41 + (nr) * 2)
159
160 #define IT87_REG_VIN_ENABLE 0x50
161 #define IT87_REG_TEMP_ENABLE 0x51
162
163 #define IT87_REG_CHIPID 0x58
164
165 #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255))
166 #define IN_FROM_REG(val) ((val) * 16)
167
168 static inline u8 FAN_TO_REG(long rpm, int div)
169 {
170 if (rpm == 0)
171 return 255;
172 rpm = SENSORS_LIMIT(rpm, 1, 1000000);
173 return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1,
174 254);
175 }
176
177 static inline u16 FAN16_TO_REG(long rpm)
178 {
179 if (rpm == 0)
180 return 0xffff;
181 return SENSORS_LIMIT((1350000 + rpm) / (rpm * 2), 1, 0xfffe);
182 }
183
184 #define FAN_FROM_REG(val,div) ((val)==0?-1:(val)==255?0:1350000/((val)*(div)))
185 /* The divider is fixed to 2 in 16-bit mode */
186 #define FAN16_FROM_REG(val) ((val)==0?-1:(val)==0xffff?0:1350000/((val)*2))
187
188 #define TEMP_TO_REG(val) (SENSORS_LIMIT(((val)<0?(((val)-500)/1000):\
189 ((val)+500)/1000),-128,127))
190 #define TEMP_FROM_REG(val) (((val)>0x80?(val)-0x100:(val))*1000)
191
192 #define PWM_TO_REG(val) ((val) >> 1)
193 #define PWM_FROM_REG(val) (((val)&0x7f) << 1)
194
195 static int DIV_TO_REG(int val)
196 {
197 int answer = 0;
198 while (answer < 7 && (val >>= 1))
199 answer++;
200 return answer;
201 }
202 #define DIV_FROM_REG(val) (1 << (val))
203
204 static const unsigned int pwm_freq[8] = {
205 48000000 / 128,
206 24000000 / 128,
207 12000000 / 128,
208 8000000 / 128,
209 6000000 / 128,
210 3000000 / 128,
211 1500000 / 128,
212 750000 / 128,
213 };
214
215
216 struct it87_sio_data {
217 enum chips type;
218 /* Values read from Super-I/O config space */
219 u8 vid_value;
220 };
221
222 /* For each registered chip, we need to keep some data in memory.
223 The structure is dynamically allocated. */
224 struct it87_data {
225 struct device *hwmon_dev;
226 enum chips type;
227
228 unsigned short addr;
229 const char *name;
230 struct mutex update_lock;
231 char valid; /* !=0 if following fields are valid */
232 unsigned long last_updated; /* In jiffies */
233
234 u8 in[9]; /* Register value */
235 u8 in_max[8]; /* Register value */
236 u8 in_min[8]; /* Register value */
237 u8 has_fan; /* Bitfield, fans enabled */
238 u16 fan[5]; /* Register values, possibly combined */
239 u16 fan_min[5]; /* Register values, possibly combined */
240 u8 temp[3]; /* Register value */
241 u8 temp_high[3]; /* Register value */
242 u8 temp_low[3]; /* Register value */
243 u8 sensor; /* Register value */
244 u8 fan_div[3]; /* Register encoding, shifted right */
245 u8 vid; /* Register encoding, combined */
246 u8 vrm;
247 u32 alarms; /* Register encoding, combined */
248 u8 fan_main_ctrl; /* Register value */
249 u8 fan_ctl; /* Register value */
250 u8 manual_pwm_ctl[3]; /* manual PWM value set by user */
251 };
252
253
254 static int it87_probe(struct platform_device *pdev);
255 static int __devexit it87_remove(struct platform_device *pdev);
256
257 static int it87_read_value(struct it87_data *data, u8 reg);
258 static void it87_write_value(struct it87_data *data, u8 reg, u8 value);
259 static struct it87_data *it87_update_device(struct device *dev);
260 static int it87_check_pwm(struct device *dev);
261 static void it87_init_device(struct platform_device *pdev);
262
263
264 static struct platform_driver it87_driver = {
265 .driver = {
266 .owner = THIS_MODULE,
267 .name = DRVNAME,
268 },
269 .probe = it87_probe,
270 .remove = __devexit_p(it87_remove),
271 };
272
273 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
274 char *buf)
275 {
276 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
277 int nr = sensor_attr->index;
278
279 struct it87_data *data = it87_update_device(dev);
280 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr]));
281 }
282
283 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
284 char *buf)
285 {
286 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
287 int nr = sensor_attr->index;
288
289 struct it87_data *data = it87_update_device(dev);
290 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr]));
291 }
292
293 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
294 char *buf)
295 {
296 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
297 int nr = sensor_attr->index;
298
299 struct it87_data *data = it87_update_device(dev);
300 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr]));
301 }
302
303 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
304 const char *buf, size_t count)
305 {
306 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
307 int nr = sensor_attr->index;
308
309 struct it87_data *data = dev_get_drvdata(dev);
310 unsigned long val = simple_strtoul(buf, NULL, 10);
311
312 mutex_lock(&data->update_lock);
313 data->in_min[nr] = IN_TO_REG(val);
314 it87_write_value(data, IT87_REG_VIN_MIN(nr),
315 data->in_min[nr]);
316 mutex_unlock(&data->update_lock);
317 return count;
318 }
319 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
320 const char *buf, size_t count)
321 {
322 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
323 int nr = sensor_attr->index;
324
325 struct it87_data *data = dev_get_drvdata(dev);
326 unsigned long val = simple_strtoul(buf, NULL, 10);
327
328 mutex_lock(&data->update_lock);
329 data->in_max[nr] = IN_TO_REG(val);
330 it87_write_value(data, IT87_REG_VIN_MAX(nr),
331 data->in_max[nr]);
332 mutex_unlock(&data->update_lock);
333 return count;
334 }
335
336 #define show_in_offset(offset) \
337 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
338 show_in, NULL, offset);
339
340 #define limit_in_offset(offset) \
341 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
342 show_in_min, set_in_min, offset); \
343 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
344 show_in_max, set_in_max, offset);
345
346 show_in_offset(0);
347 limit_in_offset(0);
348 show_in_offset(1);
349 limit_in_offset(1);
350 show_in_offset(2);
351 limit_in_offset(2);
352 show_in_offset(3);
353 limit_in_offset(3);
354 show_in_offset(4);
355 limit_in_offset(4);
356 show_in_offset(5);
357 limit_in_offset(5);
358 show_in_offset(6);
359 limit_in_offset(6);
360 show_in_offset(7);
361 limit_in_offset(7);
362 show_in_offset(8);
363
364 /* 3 temperatures */
365 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
366 char *buf)
367 {
368 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
369 int nr = sensor_attr->index;
370
371 struct it87_data *data = it87_update_device(dev);
372 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
373 }
374 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
375 char *buf)
376 {
377 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
378 int nr = sensor_attr->index;
379
380 struct it87_data *data = it87_update_device(dev);
381 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[nr]));
382 }
383 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
384 char *buf)
385 {
386 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
387 int nr = sensor_attr->index;
388
389 struct it87_data *data = it87_update_device(dev);
390 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[nr]));
391 }
392 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
393 const char *buf, size_t count)
394 {
395 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
396 int nr = sensor_attr->index;
397
398 struct it87_data *data = dev_get_drvdata(dev);
399 int val = simple_strtol(buf, NULL, 10);
400
401 mutex_lock(&data->update_lock);
402 data->temp_high[nr] = TEMP_TO_REG(val);
403 it87_write_value(data, IT87_REG_TEMP_HIGH(nr), data->temp_high[nr]);
404 mutex_unlock(&data->update_lock);
405 return count;
406 }
407 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
408 const char *buf, size_t count)
409 {
410 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
411 int nr = sensor_attr->index;
412
413 struct it87_data *data = dev_get_drvdata(dev);
414 int val = simple_strtol(buf, NULL, 10);
415
416 mutex_lock(&data->update_lock);
417 data->temp_low[nr] = TEMP_TO_REG(val);
418 it87_write_value(data, IT87_REG_TEMP_LOW(nr), data->temp_low[nr]);
419 mutex_unlock(&data->update_lock);
420 return count;
421 }
422 #define show_temp_offset(offset) \
423 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
424 show_temp, NULL, offset - 1); \
425 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
426 show_temp_max, set_temp_max, offset - 1); \
427 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
428 show_temp_min, set_temp_min, offset - 1);
429
430 show_temp_offset(1);
431 show_temp_offset(2);
432 show_temp_offset(3);
433
434 static ssize_t show_sensor(struct device *dev, struct device_attribute *attr,
435 char *buf)
436 {
437 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
438 int nr = sensor_attr->index;
439
440 struct it87_data *data = it87_update_device(dev);
441 u8 reg = data->sensor; /* In case the value is updated while we use it */
442
443 if (reg & (1 << nr))
444 return sprintf(buf, "3\n"); /* thermal diode */
445 if (reg & (8 << nr))
446 return sprintf(buf, "2\n"); /* thermistor */
447 return sprintf(buf, "0\n"); /* disabled */
448 }
449 static ssize_t set_sensor(struct device *dev, struct device_attribute *attr,
450 const char *buf, size_t count)
451 {
452 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
453 int nr = sensor_attr->index;
454
455 struct it87_data *data = dev_get_drvdata(dev);
456 int val = simple_strtol(buf, NULL, 10);
457
458 mutex_lock(&data->update_lock);
459
460 data->sensor &= ~(1 << nr);
461 data->sensor &= ~(8 << nr);
462 /* 3 = thermal diode; 2 = thermistor; 0 = disabled */
463 if (val == 3)
464 data->sensor |= 1 << nr;
465 else if (val == 2)
466 data->sensor |= 8 << nr;
467 else if (val != 0) {
468 mutex_unlock(&data->update_lock);
469 return -EINVAL;
470 }
471 it87_write_value(data, IT87_REG_TEMP_ENABLE, data->sensor);
472 mutex_unlock(&data->update_lock);
473 return count;
474 }
475 #define show_sensor_offset(offset) \
476 static SENSOR_DEVICE_ATTR(temp##offset##_type, S_IRUGO | S_IWUSR, \
477 show_sensor, set_sensor, offset - 1);
478
479 show_sensor_offset(1);
480 show_sensor_offset(2);
481 show_sensor_offset(3);
482
483 /* 3 Fans */
484 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
485 char *buf)
486 {
487 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
488 int nr = sensor_attr->index;
489
490 struct it87_data *data = it87_update_device(dev);
491 return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan[nr],
492 DIV_FROM_REG(data->fan_div[nr])));
493 }
494 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
495 char *buf)
496 {
497 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
498 int nr = sensor_attr->index;
499
500 struct it87_data *data = it87_update_device(dev);
501 return sprintf(buf,"%d\n",
502 FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])));
503 }
504 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
505 char *buf)
506 {
507 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
508 int nr = sensor_attr->index;
509
510 struct it87_data *data = it87_update_device(dev);
511 return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
512 }
513 static ssize_t show_pwm_enable(struct device *dev, struct device_attribute *attr,
514 char *buf)
515 {
516 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
517 int nr = sensor_attr->index;
518
519 struct it87_data *data = it87_update_device(dev);
520 return sprintf(buf,"%d\n", (data->fan_main_ctrl & (1 << nr)) ? 1 : 0);
521 }
522 static ssize_t show_pwm(struct device *dev, struct device_attribute *attr,
523 char *buf)
524 {
525 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
526 int nr = sensor_attr->index;
527
528 struct it87_data *data = it87_update_device(dev);
529 return sprintf(buf,"%d\n", data->manual_pwm_ctl[nr]);
530 }
531 static ssize_t show_pwm_freq(struct device *dev, struct device_attribute *attr,
532 char *buf)
533 {
534 struct it87_data *data = it87_update_device(dev);
535 int index = (data->fan_ctl >> 4) & 0x07;
536
537 return sprintf(buf, "%u\n", pwm_freq[index]);
538 }
539 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
540 const char *buf, size_t count)
541 {
542 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
543 int nr = sensor_attr->index;
544
545 struct it87_data *data = dev_get_drvdata(dev);
546 int val = simple_strtol(buf, NULL, 10);
547 u8 reg;
548
549 mutex_lock(&data->update_lock);
550 reg = it87_read_value(data, IT87_REG_FAN_DIV);
551 switch (nr) {
552 case 0: data->fan_div[nr] = reg & 0x07; break;
553 case 1: data->fan_div[nr] = (reg >> 3) & 0x07; break;
554 case 2: data->fan_div[nr] = (reg & 0x40) ? 3 : 1; break;
555 }
556
557 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
558 it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
559 mutex_unlock(&data->update_lock);
560 return count;
561 }
562 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
563 const char *buf, size_t count)
564 {
565 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
566 int nr = sensor_attr->index;
567
568 struct it87_data *data = dev_get_drvdata(dev);
569 unsigned long val = simple_strtoul(buf, NULL, 10);
570 int min;
571 u8 old;
572
573 mutex_lock(&data->update_lock);
574 old = it87_read_value(data, IT87_REG_FAN_DIV);
575
576 /* Save fan min limit */
577 min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));
578
579 switch (nr) {
580 case 0:
581 case 1:
582 data->fan_div[nr] = DIV_TO_REG(val);
583 break;
584 case 2:
585 if (val < 8)
586 data->fan_div[nr] = 1;
587 else
588 data->fan_div[nr] = 3;
589 }
590 val = old & 0x80;
591 val |= (data->fan_div[0] & 0x07);
592 val |= (data->fan_div[1] & 0x07) << 3;
593 if (data->fan_div[2] == 3)
594 val |= 0x1 << 6;
595 it87_write_value(data, IT87_REG_FAN_DIV, val);
596
597 /* Restore fan min limit */
598 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
599 it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
600
601 mutex_unlock(&data->update_lock);
602 return count;
603 }
604 static ssize_t set_pwm_enable(struct device *dev,
605 struct device_attribute *attr, const char *buf, size_t count)
606 {
607 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
608 int nr = sensor_attr->index;
609
610 struct it87_data *data = dev_get_drvdata(dev);
611 int val = simple_strtol(buf, NULL, 10);
612
613 mutex_lock(&data->update_lock);
614
615 if (val == 0) {
616 int tmp;
617 /* make sure the fan is on when in on/off mode */
618 tmp = it87_read_value(data, IT87_REG_FAN_CTL);
619 it87_write_value(data, IT87_REG_FAN_CTL, tmp | (1 << nr));
620 /* set on/off mode */
621 data->fan_main_ctrl &= ~(1 << nr);
622 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
623 } else if (val == 1) {
624 /* set SmartGuardian mode */
625 data->fan_main_ctrl |= (1 << nr);
626 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
627 /* set saved pwm value, clear FAN_CTLX PWM mode bit */
628 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
629 } else {
630 mutex_unlock(&data->update_lock);
631 return -EINVAL;
632 }
633
634 mutex_unlock(&data->update_lock);
635 return count;
636 }
637 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
638 const char *buf, size_t count)
639 {
640 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
641 int nr = sensor_attr->index;
642
643 struct it87_data *data = dev_get_drvdata(dev);
644 int val = simple_strtol(buf, NULL, 10);
645
646 if (val < 0 || val > 255)
647 return -EINVAL;
648
649 mutex_lock(&data->update_lock);
650 data->manual_pwm_ctl[nr] = val;
651 if (data->fan_main_ctrl & (1 << nr))
652 it87_write_value(data, IT87_REG_PWM(nr), PWM_TO_REG(data->manual_pwm_ctl[nr]));
653 mutex_unlock(&data->update_lock);
654 return count;
655 }
656 static ssize_t set_pwm_freq(struct device *dev,
657 struct device_attribute *attr, const char *buf, size_t count)
658 {
659 struct it87_data *data = dev_get_drvdata(dev);
660 unsigned long val = simple_strtoul(buf, NULL, 10);
661 int i;
662
663 /* Search for the nearest available frequency */
664 for (i = 0; i < 7; i++) {
665 if (val > (pwm_freq[i] + pwm_freq[i+1]) / 2)
666 break;
667 }
668
669 mutex_lock(&data->update_lock);
670 data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL) & 0x8f;
671 data->fan_ctl |= i << 4;
672 it87_write_value(data, IT87_REG_FAN_CTL, data->fan_ctl);
673 mutex_unlock(&data->update_lock);
674
675 return count;
676 }
677
678 #define show_fan_offset(offset) \
679 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
680 show_fan, NULL, offset - 1); \
681 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
682 show_fan_min, set_fan_min, offset - 1); \
683 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
684 show_fan_div, set_fan_div, offset - 1);
685
686 show_fan_offset(1);
687 show_fan_offset(2);
688 show_fan_offset(3);
689
690 #define show_pwm_offset(offset) \
691 static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
692 show_pwm_enable, set_pwm_enable, offset - 1); \
693 static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
694 show_pwm, set_pwm, offset - 1); \
695 static DEVICE_ATTR(pwm##offset##_freq, \
696 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO), \
697 show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
698
699 show_pwm_offset(1);
700 show_pwm_offset(2);
701 show_pwm_offset(3);
702
703 /* A different set of callbacks for 16-bit fans */
704 static ssize_t show_fan16(struct device *dev, struct device_attribute *attr,
705 char *buf)
706 {
707 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
708 int nr = sensor_attr->index;
709 struct it87_data *data = it87_update_device(dev);
710 return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan[nr]));
711 }
712
713 static ssize_t show_fan16_min(struct device *dev, struct device_attribute *attr,
714 char *buf)
715 {
716 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
717 int nr = sensor_attr->index;
718 struct it87_data *data = it87_update_device(dev);
719 return sprintf(buf, "%d\n", FAN16_FROM_REG(data->fan_min[nr]));
720 }
721
722 static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
723 const char *buf, size_t count)
724 {
725 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
726 int nr = sensor_attr->index;
727 struct it87_data *data = dev_get_drvdata(dev);
728 int val = simple_strtol(buf, NULL, 10);
729
730 mutex_lock(&data->update_lock);
731 data->fan_min[nr] = FAN16_TO_REG(val);
732 it87_write_value(data, IT87_REG_FAN_MIN[nr],
733 data->fan_min[nr] & 0xff);
734 it87_write_value(data, IT87_REG_FANX_MIN[nr],
735 data->fan_min[nr] >> 8);
736 mutex_unlock(&data->update_lock);
737 return count;
738 }
739
740 /* We want to use the same sysfs file names as 8-bit fans, but we need
741 different variable names, so we have to use SENSOR_ATTR instead of
742 SENSOR_DEVICE_ATTR. */
743 #define show_fan16_offset(offset) \
744 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \
745 = SENSOR_ATTR(fan##offset##_input, S_IRUGO, \
746 show_fan16, NULL, offset - 1); \
747 static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
748 = SENSOR_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
749 show_fan16_min, set_fan16_min, offset - 1)
750
751 show_fan16_offset(1);
752 show_fan16_offset(2);
753 show_fan16_offset(3);
754 show_fan16_offset(4);
755 show_fan16_offset(5);
756
757 /* Alarms */
758 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
759 {
760 struct it87_data *data = it87_update_device(dev);
761 return sprintf(buf, "%u\n", data->alarms);
762 }
763 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
764
765 static ssize_t
766 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
767 {
768 struct it87_data *data = dev_get_drvdata(dev);
769 return sprintf(buf, "%u\n", data->vrm);
770 }
771 static ssize_t
772 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
773 {
774 struct it87_data *data = dev_get_drvdata(dev);
775 u32 val;
776
777 val = simple_strtoul(buf, NULL, 10);
778 data->vrm = val;
779
780 return count;
781 }
782 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
783
784 static ssize_t
785 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
786 {
787 struct it87_data *data = it87_update_device(dev);
788 return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
789 }
790 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
791
792 static ssize_t show_name(struct device *dev, struct device_attribute
793 *devattr, char *buf)
794 {
795 struct it87_data *data = dev_get_drvdata(dev);
796 return sprintf(buf, "%s\n", data->name);
797 }
798 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
799
800 static struct attribute *it87_attributes[] = {
801 &sensor_dev_attr_in0_input.dev_attr.attr,
802 &sensor_dev_attr_in1_input.dev_attr.attr,
803 &sensor_dev_attr_in2_input.dev_attr.attr,
804 &sensor_dev_attr_in3_input.dev_attr.attr,
805 &sensor_dev_attr_in4_input.dev_attr.attr,
806 &sensor_dev_attr_in5_input.dev_attr.attr,
807 &sensor_dev_attr_in6_input.dev_attr.attr,
808 &sensor_dev_attr_in7_input.dev_attr.attr,
809 &sensor_dev_attr_in8_input.dev_attr.attr,
810 &sensor_dev_attr_in0_min.dev_attr.attr,
811 &sensor_dev_attr_in1_min.dev_attr.attr,
812 &sensor_dev_attr_in2_min.dev_attr.attr,
813 &sensor_dev_attr_in3_min.dev_attr.attr,
814 &sensor_dev_attr_in4_min.dev_attr.attr,
815 &sensor_dev_attr_in5_min.dev_attr.attr,
816 &sensor_dev_attr_in6_min.dev_attr.attr,
817 &sensor_dev_attr_in7_min.dev_attr.attr,
818 &sensor_dev_attr_in0_max.dev_attr.attr,
819 &sensor_dev_attr_in1_max.dev_attr.attr,
820 &sensor_dev_attr_in2_max.dev_attr.attr,
821 &sensor_dev_attr_in3_max.dev_attr.attr,
822 &sensor_dev_attr_in4_max.dev_attr.attr,
823 &sensor_dev_attr_in5_max.dev_attr.attr,
824 &sensor_dev_attr_in6_max.dev_attr.attr,
825 &sensor_dev_attr_in7_max.dev_attr.attr,
826
827 &sensor_dev_attr_temp1_input.dev_attr.attr,
828 &sensor_dev_attr_temp2_input.dev_attr.attr,
829 &sensor_dev_attr_temp3_input.dev_attr.attr,
830 &sensor_dev_attr_temp1_max.dev_attr.attr,
831 &sensor_dev_attr_temp2_max.dev_attr.attr,
832 &sensor_dev_attr_temp3_max.dev_attr.attr,
833 &sensor_dev_attr_temp1_min.dev_attr.attr,
834 &sensor_dev_attr_temp2_min.dev_attr.attr,
835 &sensor_dev_attr_temp3_min.dev_attr.attr,
836 &sensor_dev_attr_temp1_type.dev_attr.attr,
837 &sensor_dev_attr_temp2_type.dev_attr.attr,
838 &sensor_dev_attr_temp3_type.dev_attr.attr,
839
840 &dev_attr_alarms.attr,
841 &dev_attr_name.attr,
842 NULL
843 };
844
845 static const struct attribute_group it87_group = {
846 .attrs = it87_attributes,
847 };
848
849 static struct attribute *it87_attributes_opt[] = {
850 &sensor_dev_attr_fan1_input16.dev_attr.attr,
851 &sensor_dev_attr_fan1_min16.dev_attr.attr,
852 &sensor_dev_attr_fan2_input16.dev_attr.attr,
853 &sensor_dev_attr_fan2_min16.dev_attr.attr,
854 &sensor_dev_attr_fan3_input16.dev_attr.attr,
855 &sensor_dev_attr_fan3_min16.dev_attr.attr,
856 &sensor_dev_attr_fan4_input16.dev_attr.attr,
857 &sensor_dev_attr_fan4_min16.dev_attr.attr,
858 &sensor_dev_attr_fan5_input16.dev_attr.attr,
859 &sensor_dev_attr_fan5_min16.dev_attr.attr,
860
861 &sensor_dev_attr_fan1_input.dev_attr.attr,
862 &sensor_dev_attr_fan1_min.dev_attr.attr,
863 &sensor_dev_attr_fan1_div.dev_attr.attr,
864 &sensor_dev_attr_fan2_input.dev_attr.attr,
865 &sensor_dev_attr_fan2_min.dev_attr.attr,
866 &sensor_dev_attr_fan2_div.dev_attr.attr,
867 &sensor_dev_attr_fan3_input.dev_attr.attr,
868 &sensor_dev_attr_fan3_min.dev_attr.attr,
869 &sensor_dev_attr_fan3_div.dev_attr.attr,
870
871 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
872 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
873 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
874 &sensor_dev_attr_pwm1.dev_attr.attr,
875 &sensor_dev_attr_pwm2.dev_attr.attr,
876 &sensor_dev_attr_pwm3.dev_attr.attr,
877
878 &dev_attr_vrm.attr,
879 &dev_attr_cpu0_vid.attr,
880 NULL
881 };
882
883 static const struct attribute_group it87_group_opt = {
884 .attrs = it87_attributes_opt,
885 };
886
887 /* SuperIO detection - will change isa_address if a chip is found */
888 static int __init it87_find(unsigned short *address,
889 struct it87_sio_data *sio_data)
890 {
891 int err = -ENODEV;
892 u16 chip_type;
893
894 superio_enter();
895 chip_type = superio_inw(DEVID);
896
897 switch (chip_type) {
898 case IT8705F_DEVID:
899 sio_data->type = it87;
900 break;
901 case IT8712F_DEVID:
902 sio_data->type = it8712;
903 break;
904 case IT8716F_DEVID:
905 case IT8726F_DEVID:
906 sio_data->type = it8716;
907 break;
908 case IT8718F_DEVID:
909 sio_data->type = it8718;
910 break;
911 case 0xffff: /* No device at all */
912 goto exit;
913 default:
914 pr_debug(DRVNAME ": Unsupported chip (DEVID=0x%x)\n",
915 chip_type);
916 goto exit;
917 }
918
919 superio_select(PME);
920 if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
921 pr_info("it87: Device not activated, skipping\n");
922 goto exit;
923 }
924
925 *address = superio_inw(IT87_BASE_REG) & ~(IT87_EXTENT - 1);
926 if (*address == 0) {
927 pr_info("it87: Base address not set, skipping\n");
928 goto exit;
929 }
930
931 err = 0;
932 pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
933 chip_type, *address, superio_inb(DEVREV) & 0x0f);
934
935 /* Read GPIO config and VID value from LDN 7 (GPIO) */
936 if (chip_type != IT8705F_DEVID) {
937 int reg;
938
939 superio_select(GPIO);
940 if (chip_type == it8718)
941 sio_data->vid_value = superio_inb(IT87_SIO_VID_REG);
942
943 reg = superio_inb(IT87_SIO_PINX2_REG);
944 if (reg & (1 << 0))
945 pr_info("it87: in3 is VCC (+5V)\n");
946 if (reg & (1 << 1))
947 pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
948 }
949
950 exit:
951 superio_exit();
952 return err;
953 }
954
955 static int __devinit it87_probe(struct platform_device *pdev)
956 {
957 struct it87_data *data;
958 struct resource *res;
959 struct device *dev = &pdev->dev;
960 struct it87_sio_data *sio_data = dev->platform_data;
961 int err = 0;
962 int enable_pwm_interface;
963 static const char *names[] = {
964 "it87",
965 "it8712",
966 "it8716",
967 "it8718",
968 };
969
970 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
971 if (!request_region(res->start, IT87_EXTENT, DRVNAME)) {
972 dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
973 (unsigned long)res->start,
974 (unsigned long)(res->start + IT87_EXTENT - 1));
975 err = -EBUSY;
976 goto ERROR0;
977 }
978
979 if (!(data = kzalloc(sizeof(struct it87_data), GFP_KERNEL))) {
980 err = -ENOMEM;
981 goto ERROR1;
982 }
983
984 data->addr = res->start;
985 data->type = sio_data->type;
986 data->name = names[sio_data->type];
987
988 /* Now, we do the remaining detection. */
989 if ((it87_read_value(data, IT87_REG_CONFIG) & 0x80)
990 || it87_read_value(data, IT87_REG_CHIPID) != 0x90) {
991 err = -ENODEV;
992 goto ERROR2;
993 }
994
995 platform_set_drvdata(pdev, data);
996
997 mutex_init(&data->update_lock);
998
999 /* Check PWM configuration */
1000 enable_pwm_interface = it87_check_pwm(dev);
1001
1002 /* Initialize the IT87 chip */
1003 it87_init_device(pdev);
1004
1005 /* Register sysfs hooks */
1006 if ((err = sysfs_create_group(&dev->kobj, &it87_group)))
1007 goto ERROR2;
1008
1009 /* Do not create fan files for disabled fans */
1010 if (data->type == it8716 || data->type == it8718) {
1011 /* 16-bit tachometers */
1012 if (data->has_fan & (1 << 0)) {
1013 if ((err = device_create_file(dev,
1014 &sensor_dev_attr_fan1_input16.dev_attr))
1015 || (err = device_create_file(dev,
1016 &sensor_dev_attr_fan1_min16.dev_attr)))
1017 goto ERROR4;
1018 }
1019 if (data->has_fan & (1 << 1)) {
1020 if ((err = device_create_file(dev,
1021 &sensor_dev_attr_fan2_input16.dev_attr))
1022 || (err = device_create_file(dev,
1023 &sensor_dev_attr_fan2_min16.dev_attr)))
1024 goto ERROR4;
1025 }
1026 if (data->has_fan & (1 << 2)) {
1027 if ((err = device_create_file(dev,
1028 &sensor_dev_attr_fan3_input16.dev_attr))
1029 || (err = device_create_file(dev,
1030 &sensor_dev_attr_fan3_min16.dev_attr)))
1031 goto ERROR4;
1032 }
1033 if (data->has_fan & (1 << 3)) {
1034 if ((err = device_create_file(dev,
1035 &sensor_dev_attr_fan4_input16.dev_attr))
1036 || (err = device_create_file(dev,
1037 &sensor_dev_attr_fan4_min16.dev_attr)))
1038 goto ERROR4;
1039 }
1040 if (data->has_fan & (1 << 4)) {
1041 if ((err = device_create_file(dev,
1042 &sensor_dev_attr_fan5_input16.dev_attr))
1043 || (err = device_create_file(dev,
1044 &sensor_dev_attr_fan5_min16.dev_attr)))
1045 goto ERROR4;
1046 }
1047 } else {
1048 /* 8-bit tachometers with clock divider */
1049 if (data->has_fan & (1 << 0)) {
1050 if ((err = device_create_file(dev,
1051 &sensor_dev_attr_fan1_input.dev_attr))
1052 || (err = device_create_file(dev,
1053 &sensor_dev_attr_fan1_min.dev_attr))
1054 || (err = device_create_file(dev,
1055 &sensor_dev_attr_fan1_div.dev_attr)))
1056 goto ERROR4;
1057 }
1058 if (data->has_fan & (1 << 1)) {
1059 if ((err = device_create_file(dev,
1060 &sensor_dev_attr_fan2_input.dev_attr))
1061 || (err = device_create_file(dev,
1062 &sensor_dev_attr_fan2_min.dev_attr))
1063 || (err = device_create_file(dev,
1064 &sensor_dev_attr_fan2_div.dev_attr)))
1065 goto ERROR4;
1066 }
1067 if (data->has_fan & (1 << 2)) {
1068 if ((err = device_create_file(dev,
1069 &sensor_dev_attr_fan3_input.dev_attr))
1070 || (err = device_create_file(dev,
1071 &sensor_dev_attr_fan3_min.dev_attr))
1072 || (err = device_create_file(dev,
1073 &sensor_dev_attr_fan3_div.dev_attr)))
1074 goto ERROR4;
1075 }
1076 }
1077
1078 if (enable_pwm_interface) {
1079 if ((err = device_create_file(dev,
1080 &sensor_dev_attr_pwm1_enable.dev_attr))
1081 || (err = device_create_file(dev,
1082 &sensor_dev_attr_pwm2_enable.dev_attr))
1083 || (err = device_create_file(dev,
1084 &sensor_dev_attr_pwm3_enable.dev_attr))
1085 || (err = device_create_file(dev,
1086 &sensor_dev_attr_pwm1.dev_attr))
1087 || (err = device_create_file(dev,
1088 &sensor_dev_attr_pwm2.dev_attr))
1089 || (err = device_create_file(dev,
1090 &sensor_dev_attr_pwm3.dev_attr))
1091 || (err = device_create_file(dev,
1092 &dev_attr_pwm1_freq))
1093 || (err = device_create_file(dev,
1094 &dev_attr_pwm2_freq))
1095 || (err = device_create_file(dev,
1096 &dev_attr_pwm3_freq)))
1097 goto ERROR4;
1098 }
1099
1100 if (data->type == it8712 || data->type == it8716
1101 || data->type == it8718) {
1102 data->vrm = vid_which_vrm();
1103 /* VID reading from Super-I/O config space if available */
1104 data->vid = sio_data->vid_value;
1105 if ((err = device_create_file(dev,
1106 &dev_attr_vrm))
1107 || (err = device_create_file(dev,
1108 &dev_attr_cpu0_vid)))
1109 goto ERROR4;
1110 }
1111
1112 data->hwmon_dev = hwmon_device_register(dev);
1113 if (IS_ERR(data->hwmon_dev)) {
1114 err = PTR_ERR(data->hwmon_dev);
1115 goto ERROR4;
1116 }
1117
1118 return 0;
1119
1120 ERROR4:
1121 sysfs_remove_group(&dev->kobj, &it87_group);
1122 sysfs_remove_group(&dev->kobj, &it87_group_opt);
1123 ERROR2:
1124 platform_set_drvdata(pdev, NULL);
1125 kfree(data);
1126 ERROR1:
1127 release_region(res->start, IT87_EXTENT);
1128 ERROR0:
1129 return err;
1130 }
1131
1132 static int __devexit it87_remove(struct platform_device *pdev)
1133 {
1134 struct it87_data *data = platform_get_drvdata(pdev);
1135
1136 hwmon_device_unregister(data->hwmon_dev);
1137 sysfs_remove_group(&pdev->dev.kobj, &it87_group);
1138 sysfs_remove_group(&pdev->dev.kobj, &it87_group_opt);
1139
1140 release_region(data->addr, IT87_EXTENT);
1141 platform_set_drvdata(pdev, NULL);
1142 kfree(data);
1143
1144 return 0;
1145 }
1146
1147 /* Must be called with data->update_lock held, except during initialization.
1148 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1149 would slow down the IT87 access and should not be necessary. */
1150 static int it87_read_value(struct it87_data *data, u8 reg)
1151 {
1152 outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1153 return inb_p(data->addr + IT87_DATA_REG_OFFSET);
1154 }
1155
1156 /* Must be called with data->update_lock held, except during initialization.
1157 We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks,
1158 would slow down the IT87 access and should not be necessary. */
1159 static void it87_write_value(struct it87_data *data, u8 reg, u8 value)
1160 {
1161 outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET);
1162 outb_p(value, data->addr + IT87_DATA_REG_OFFSET);
1163 }
1164
1165 /* Return 1 if and only if the PWM interface is safe to use */
1166 static int __devinit it87_check_pwm(struct device *dev)
1167 {
1168 struct it87_data *data = dev_get_drvdata(dev);
1169 /* Some BIOSes fail to correctly configure the IT87 fans. All fans off
1170 * and polarity set to active low is sign that this is the case so we
1171 * disable pwm control to protect the user. */
1172 int tmp = it87_read_value(data, IT87_REG_FAN_CTL);
1173 if ((tmp & 0x87) == 0) {
1174 if (fix_pwm_polarity) {
1175 /* The user asks us to attempt a chip reconfiguration.
1176 * This means switching to active high polarity and
1177 * inverting all fan speed values. */
1178 int i;
1179 u8 pwm[3];
1180
1181 for (i = 0; i < 3; i++)
1182 pwm[i] = it87_read_value(data,
1183 IT87_REG_PWM(i));
1184
1185 /* If any fan is in automatic pwm mode, the polarity
1186 * might be correct, as suspicious as it seems, so we
1187 * better don't change anything (but still disable the
1188 * PWM interface). */
1189 if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) {
1190 dev_info(dev, "Reconfiguring PWM to "
1191 "active high polarity\n");
1192 it87_write_value(data, IT87_REG_FAN_CTL,
1193 tmp | 0x87);
1194 for (i = 0; i < 3; i++)
1195 it87_write_value(data,
1196 IT87_REG_PWM(i),
1197 0x7f & ~pwm[i]);
1198 return 1;
1199 }
1200
1201 dev_info(dev, "PWM configuration is "
1202 "too broken to be fixed\n");
1203 }
1204
1205 dev_info(dev, "Detected broken BIOS "
1206 "defaults, disabling PWM interface\n");
1207 return 0;
1208 } else if (fix_pwm_polarity) {
1209 dev_info(dev, "PWM configuration looks "
1210 "sane, won't touch\n");
1211 }
1212
1213 return 1;
1214 }
1215
1216 /* Called when we have found a new IT87. */
1217 static void __devinit it87_init_device(struct platform_device *pdev)
1218 {
1219 struct it87_data *data = platform_get_drvdata(pdev);
1220 int tmp, i;
1221
1222 /* initialize to sane defaults:
1223 * - if the chip is in manual pwm mode, this will be overwritten with
1224 * the actual settings on the chip (so in this case, initialization
1225 * is not needed)
1226 * - if in automatic or on/off mode, we could switch to manual mode,
1227 * read the registers and set manual_pwm_ctl accordingly, but currently
1228 * this is not implemented, so we initialize to something sane */
1229 for (i = 0; i < 3; i++) {
1230 data->manual_pwm_ctl[i] = 0xff;
1231 }
1232
1233 /* Some chips seem to have default value 0xff for all limit
1234 * registers. For low voltage limits it makes no sense and triggers
1235 * alarms, so change to 0 instead. For high temperature limits, it
1236 * means -1 degree C, which surprisingly doesn't trigger an alarm,
1237 * but is still confusing, so change to 127 degrees C. */
1238 for (i = 0; i < 8; i++) {
1239 tmp = it87_read_value(data, IT87_REG_VIN_MIN(i));
1240 if (tmp == 0xff)
1241 it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
1242 }
1243 for (i = 0; i < 3; i++) {
1244 tmp = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1245 if (tmp == 0xff)
1246 it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
1247 }
1248
1249 /* Check if temperature channnels are reset manually or by some reason */
1250 tmp = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1251 if ((tmp & 0x3f) == 0) {
1252 /* Temp1,Temp3=thermistor; Temp2=thermal diode */
1253 tmp = (tmp & 0xc0) | 0x2a;
1254 it87_write_value(data, IT87_REG_TEMP_ENABLE, tmp);
1255 }
1256 data->sensor = tmp;
1257
1258 /* Check if voltage monitors are reset manually or by some reason */
1259 tmp = it87_read_value(data, IT87_REG_VIN_ENABLE);
1260 if ((tmp & 0xff) == 0) {
1261 /* Enable all voltage monitors */
1262 it87_write_value(data, IT87_REG_VIN_ENABLE, 0xff);
1263 }
1264
1265 /* Check if tachometers are reset manually or by some reason */
1266 data->fan_main_ctrl = it87_read_value(data, IT87_REG_FAN_MAIN_CTRL);
1267 if ((data->fan_main_ctrl & 0x70) == 0) {
1268 /* Enable all fan tachometers */
1269 data->fan_main_ctrl |= 0x70;
1270 it87_write_value(data, IT87_REG_FAN_MAIN_CTRL, data->fan_main_ctrl);
1271 }
1272 data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
1273
1274 /* Set tachometers to 16-bit mode if needed */
1275 if (data->type == it8716 || data->type == it8718) {
1276 tmp = it87_read_value(data, IT87_REG_FAN_16BIT);
1277 if (~tmp & 0x07 & data->has_fan) {
1278 dev_dbg(&pdev->dev,
1279 "Setting fan1-3 to 16-bit mode\n");
1280 it87_write_value(data, IT87_REG_FAN_16BIT,
1281 tmp | 0x07);
1282 }
1283 if (tmp & (1 << 4))
1284 data->has_fan |= (1 << 3); /* fan4 enabled */
1285 if (tmp & (1 << 5))
1286 data->has_fan |= (1 << 4); /* fan5 enabled */
1287 }
1288
1289 /* Set current fan mode registers and the default settings for the
1290 * other mode registers */
1291 for (i = 0; i < 3; i++) {
1292 if (data->fan_main_ctrl & (1 << i)) {
1293 /* pwm mode */
1294 tmp = it87_read_value(data, IT87_REG_PWM(i));
1295 if (tmp & 0x80) {
1296 /* automatic pwm - not yet implemented, but
1297 * leave the settings made by the BIOS alone
1298 * until a change is requested via the sysfs
1299 * interface */
1300 } else {
1301 /* manual pwm */
1302 data->manual_pwm_ctl[i] = PWM_FROM_REG(tmp);
1303 }
1304 }
1305 }
1306
1307 /* Start monitoring */
1308 it87_write_value(data, IT87_REG_CONFIG,
1309 (it87_read_value(data, IT87_REG_CONFIG) & 0x36)
1310 | (update_vbat ? 0x41 : 0x01));
1311 }
1312
1313 static struct it87_data *it87_update_device(struct device *dev)
1314 {
1315 struct it87_data *data = dev_get_drvdata(dev);
1316 int i;
1317
1318 mutex_lock(&data->update_lock);
1319
1320 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
1321 || !data->valid) {
1322
1323 if (update_vbat) {
1324 /* Cleared after each update, so reenable. Value
1325 returned by this read will be previous value */
1326 it87_write_value(data, IT87_REG_CONFIG,
1327 it87_read_value(data, IT87_REG_CONFIG) | 0x40);
1328 }
1329 for (i = 0; i <= 7; i++) {
1330 data->in[i] =
1331 it87_read_value(data, IT87_REG_VIN(i));
1332 data->in_min[i] =
1333 it87_read_value(data, IT87_REG_VIN_MIN(i));
1334 data->in_max[i] =
1335 it87_read_value(data, IT87_REG_VIN_MAX(i));
1336 }
1337 /* in8 (battery) has no limit registers */
1338 data->in[8] =
1339 it87_read_value(data, IT87_REG_VIN(8));
1340
1341 for (i = 0; i < 5; i++) {
1342 /* Skip disabled fans */
1343 if (!(data->has_fan & (1 << i)))
1344 continue;
1345
1346 data->fan_min[i] =
1347 it87_read_value(data, IT87_REG_FAN_MIN[i]);
1348 data->fan[i] = it87_read_value(data,
1349 IT87_REG_FAN[i]);
1350 /* Add high byte if in 16-bit mode */
1351 if (data->type == it8716 || data->type == it8718) {
1352 data->fan[i] |= it87_read_value(data,
1353 IT87_REG_FANX[i]) << 8;
1354 data->fan_min[i] |= it87_read_value(data,
1355 IT87_REG_FANX_MIN[i]) << 8;
1356 }
1357 }
1358 for (i = 0; i < 3; i++) {
1359 data->temp[i] =
1360 it87_read_value(data, IT87_REG_TEMP(i));
1361 data->temp_high[i] =
1362 it87_read_value(data, IT87_REG_TEMP_HIGH(i));
1363 data->temp_low[i] =
1364 it87_read_value(data, IT87_REG_TEMP_LOW(i));
1365 }
1366
1367 /* Newer chips don't have clock dividers */
1368 if ((data->has_fan & 0x07) && data->type != it8716
1369 && data->type != it8718) {
1370 i = it87_read_value(data, IT87_REG_FAN_DIV);
1371 data->fan_div[0] = i & 0x07;
1372 data->fan_div[1] = (i >> 3) & 0x07;
1373 data->fan_div[2] = (i & 0x40) ? 3 : 1;
1374 }
1375
1376 data->alarms =
1377 it87_read_value(data, IT87_REG_ALARM1) |
1378 (it87_read_value(data, IT87_REG_ALARM2) << 8) |
1379 (it87_read_value(data, IT87_REG_ALARM3) << 16);
1380 data->fan_main_ctrl = it87_read_value(data,
1381 IT87_REG_FAN_MAIN_CTRL);
1382 data->fan_ctl = it87_read_value(data, IT87_REG_FAN_CTL);
1383
1384 data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE);
1385 /* The 8705 does not have VID capability */
1386 if (data->type == it8712 || data->type == it8716) {
1387 data->vid = it87_read_value(data, IT87_REG_VID);
1388 /* The older IT8712F revisions had only 5 VID pins,
1389 but we assume it is always safe to read 6 bits. */
1390 data->vid &= 0x3f;
1391 }
1392 data->last_updated = jiffies;
1393 data->valid = 1;
1394 }
1395
1396 mutex_unlock(&data->update_lock);
1397
1398 return data;
1399 }
1400
1401 static int __init it87_device_add(unsigned short address,
1402 const struct it87_sio_data *sio_data)
1403 {
1404 struct resource res = {
1405 .start = address ,
1406 .end = address + IT87_EXTENT - 1,
1407 .name = DRVNAME,
1408 .flags = IORESOURCE_IO,
1409 };
1410 int err;
1411
1412 pdev = platform_device_alloc(DRVNAME, address);
1413 if (!pdev) {
1414 err = -ENOMEM;
1415 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
1416 goto exit;
1417 }
1418
1419 err = platform_device_add_resources(pdev, &res, 1);
1420 if (err) {
1421 printk(KERN_ERR DRVNAME ": Device resource addition failed "
1422 "(%d)\n", err);
1423 goto exit_device_put;
1424 }
1425
1426 err = platform_device_add_data(pdev, sio_data,
1427 sizeof(struct it87_sio_data));
1428 if (err) {
1429 printk(KERN_ERR DRVNAME ": Platform data allocation failed\n");
1430 goto exit_device_put;
1431 }
1432
1433 err = platform_device_add(pdev);
1434 if (err) {
1435 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
1436 err);
1437 goto exit_device_put;
1438 }
1439
1440 return 0;
1441
1442 exit_device_put:
1443 platform_device_put(pdev);
1444 exit:
1445 return err;
1446 }
1447
1448 static int __init sm_it87_init(void)
1449 {
1450 int err;
1451 unsigned short isa_address=0;
1452 struct it87_sio_data sio_data;
1453
1454 err = it87_find(&isa_address, &sio_data);
1455 if (err)
1456 return err;
1457 err = platform_driver_register(&it87_driver);
1458 if (err)
1459 return err;
1460
1461 err = it87_device_add(isa_address, &sio_data);
1462 if (err){
1463 platform_driver_unregister(&it87_driver);
1464 return err;
1465 }
1466
1467 return 0;
1468 }
1469
1470 static void __exit sm_it87_exit(void)
1471 {
1472 platform_device_unregister(pdev);
1473 platform_driver_unregister(&it87_driver);
1474 }
1475
1476
1477 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>, "
1478 "Jean Delvare <khali@linux-fr.org>");
1479 MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F/8726F, SiS950 driver");
1480 module_param(update_vbat, bool, 0);
1481 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
1482 module_param(fix_pwm_polarity, bool, 0);
1483 MODULE_PARM_DESC(fix_pwm_polarity, "Force PWM polarity to active high (DANGEROUS)");
1484 MODULE_LICENSE("GPL");
1485
1486 module_init(sm_it87_init);
1487 module_exit(sm_it87_exit);
WRT350N Kernel Patches