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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 *
6 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl>
7 * Philip Edelbrock <phil@netroedge.com>
8 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl>
9 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable
10 * guidance from Jean Delvare
11 *
12 * Driver supports Analog Devices ADM9240
13 * Dallas Semiconductor DS1780
14 * National Semiconductor LM81
15 *
16 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
17 *
18 * Voltage Six inputs are scaled by chip, VID also reported
19 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
20 * Fans 2 fans, low speed alarm, automatic fan clock divider
21 * Alarms 16-bit map of active alarms
22 * Analog Out 0..1250 mV output
23 *
24 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
25 *
26 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
27 *
28 * LM81 extended temp reading not implemented
29 */
30
31#include <linux/bits.h>
32#include <linux/init.h>
33#include <linux/module.h>
34#include <linux/slab.h>
35#include <linux/i2c.h>
36#include <linux/hwmon-sysfs.h>
37#include <linux/hwmon.h>
38#include <linux/hwmon-vid.h>
39#include <linux/err.h>
40#include <linux/mutex.h>
41#include <linux/regmap.h>
42
43/* Addresses to scan */
44static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
45 I2C_CLIENT_END };
46
47enum chips { adm9240, ds1780, lm81 };
48
49/* ADM9240 registers */
50#define ADM9240_REG_MAN_ID 0x3e
51#define ADM9240_REG_DIE_REV 0x3f
52#define ADM9240_REG_CONFIG 0x40
53
54#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
55#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
56#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
57#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
58#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
59#define ADM9240_REG_INT(nr) (0x41 + (nr))
60#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
61#define ADM9240_REG_TEMP 0x27
62#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
63#define ADM9240_REG_ANALOG_OUT 0x19
64#define ADM9240_REG_CHASSIS_CLEAR 0x46
65#define ADM9240_REG_VID_FAN_DIV 0x47
66#define ADM9240_REG_I2C_ADDR 0x48
67#define ADM9240_REG_VID4 0x49
68#define ADM9240_REG_TEMP_CONF 0x4b
69
70/* generalised scaling with integer rounding */
71static inline int SCALE(long val, int mul, int div)
72{
73 if (val < 0)
74 return (val * mul - div / 2) / div;
75 else
76 return (val * mul + div / 2) / div;
77}
78
79/* adm9240 internally scales voltage measurements */
80static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
81
82static inline unsigned int IN_FROM_REG(u8 reg, int n)
83{
84 return SCALE(reg, nom_mv[n], 192);
85}
86
87static inline u8 IN_TO_REG(unsigned long val, int n)
88{
89 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
90 return SCALE(val, 192, nom_mv[n]);
91}
92
93/* temperature range: -40..125, 127 disables temperature alarm */
94static inline s8 TEMP_TO_REG(long val)
95{
96 val = clamp_val(val, -40000, 127000);
97 return SCALE(val, 1, 1000);
98}
99
100/* two fans, each with low fan speed limit */
101static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
102{
103 if (!reg) /* error */
104 return -1;
105
106 if (reg == 255)
107 return 0;
108
109 return SCALE(1350000, 1, reg * div);
110}
111
112/* analog out 0..1250mV */
113static inline u8 AOUT_TO_REG(unsigned long val)
114{
115 val = clamp_val(val, 0, 1250);
116 return SCALE(val, 255, 1250);
117}
118
119static inline unsigned int AOUT_FROM_REG(u8 reg)
120{
121 return SCALE(reg, 1250, 255);
122}
123
124/* per client data */
125struct adm9240_data {
126 struct device *dev;
127 struct regmap *regmap;
128 struct mutex update_lock;
129
130 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
131 u8 vrm; /* -- vrm set on startup, no accessor */
132};
133
134/* write new fan div, callers must hold data->update_lock */
135static int adm9240_write_fan_div(struct adm9240_data *data, int channel, u8 fan_div)
136{
137 unsigned int reg, old, shift = (channel + 2) * 2;
138 int err;
139
140 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®);
141 if (err < 0)
142 return err;
143 old = (reg >> shift) & 3;
144 reg &= ~(3 << shift);
145 reg |= (fan_div << shift);
146 err = regmap_write(data->regmap, ADM9240_REG_VID_FAN_DIV, reg);
147 if (err < 0)
148 return err;
149 dev_dbg(data->dev,
150 "fan%d clock divider changed from %lu to %lu\n",
151 channel + 1, BIT(old), BIT(fan_div));
152
153 return 0;
154}
155
156/*
157 * set fan speed low limit:
158 *
159 * - value is zero: disable fan speed low limit alarm
160 *
161 * - value is below fan speed measurement range: enable fan speed low
162 * limit alarm to be asserted while fan speed too slow to measure
163 *
164 * - otherwise: select fan clock divider to suit fan speed low limit,
165 * measurement code may adjust registers to ensure fan speed reading
166 */
167static int adm9240_fan_min_write(struct adm9240_data *data, int channel, long val)
168{
169 u8 new_div;
170 u8 fan_min;
171 int err;
172
173 mutex_lock(&data->update_lock);
174
175 if (!val) {
176 fan_min = 255;
177 new_div = data->fan_div[channel];
178
179 dev_dbg(data->dev, "fan%u low limit set disabled\n", channel + 1);
180 } else if (val < 1350000 / (8 * 254)) {
181 new_div = 3;
182 fan_min = 254;
183
184 dev_dbg(data->dev, "fan%u low limit set minimum %u\n",
185 channel + 1, FAN_FROM_REG(254, BIT(new_div)));
186 } else {
187 unsigned int new_min = 1350000 / val;
188
189 new_div = 0;
190 while (new_min > 192 && new_div < 3) {
191 new_div++;
192 new_min /= 2;
193 }
194 if (!new_min) /* keep > 0 */
195 new_min++;
196
197 fan_min = new_min;
198
199 dev_dbg(data->dev, "fan%u low limit set fan speed %u\n",
200 channel + 1, FAN_FROM_REG(new_min, BIT(new_div)));
201 }
202
203 if (new_div != data->fan_div[channel]) {
204 data->fan_div[channel] = new_div;
205 adm9240_write_fan_div(data, channel, new_div);
206 }
207 err = regmap_write(data->regmap, ADM9240_REG_FAN_MIN(channel), fan_min);
208
209 mutex_unlock(&data->update_lock);
210
211 return err;
212}
213
214static ssize_t cpu0_vid_show(struct device *dev,
215 struct device_attribute *attr, char *buf)
216{
217 struct adm9240_data *data = dev_get_drvdata(dev);
218 unsigned int regval;
219 int err;
220 u8 vid;
221
222 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
223 if (err < 0)
224 return err;
225 vid = regval & 0x0f;
226 err = regmap_read(data->regmap, ADM9240_REG_VID4, ®val);
227 if (err < 0)
228 return err;
229 vid |= (regval & 1) << 4;
230 return sprintf(buf, "%d\n", vid_from_reg(vid, data->vrm));
231}
232static DEVICE_ATTR_RO(cpu0_vid);
233
234static ssize_t aout_output_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
237 struct adm9240_data *data = dev_get_drvdata(dev);
238 unsigned int regval;
239 int err;
240
241 err = regmap_read(data->regmap, ADM9240_REG_ANALOG_OUT, ®val);
242 if (err)
243 return err;
244
245 return sprintf(buf, "%d\n", AOUT_FROM_REG(regval));
246}
247
248static ssize_t aout_output_store(struct device *dev,
249 struct device_attribute *attr,
250 const char *buf, size_t count)
251{
252 struct adm9240_data *data = dev_get_drvdata(dev);
253 long val;
254 int err;
255
256 err = kstrtol(buf, 10, &val);
257 if (err)
258 return err;
259
260 err = regmap_write(data->regmap, ADM9240_REG_ANALOG_OUT, AOUT_TO_REG(val));
261 return err < 0 ? err : count;
262}
263static DEVICE_ATTR_RW(aout_output);
264
265static struct attribute *adm9240_attrs[] = {
266 &dev_attr_aout_output.attr,
267 &dev_attr_cpu0_vid.attr,
268 NULL
269};
270
271ATTRIBUTE_GROUPS(adm9240);
272
273/*** sensor chip detect and driver install ***/
274
275/* Return 0 if detection is successful, -ENODEV otherwise */
276static int adm9240_detect(struct i2c_client *new_client,
277 struct i2c_board_info *info)
278{
279 struct i2c_adapter *adapter = new_client->adapter;
280 const char *name = "";
281 int address = new_client->addr;
282 u8 man_id, die_rev;
283
284 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
285 return -ENODEV;
286
287 /* verify chip: reg address should match i2c address */
288 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR) != address)
289 return -ENODEV;
290
291 /* check known chip manufacturer */
292 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
293 if (man_id == 0x23)
294 name = "adm9240";
295 else if (man_id == 0xda)
296 name = "ds1780";
297 else if (man_id == 0x01)
298 name = "lm81";
299 else
300 return -ENODEV;
301
302 /* successful detect, print chip info */
303 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
304 dev_info(&adapter->dev, "found %s revision %u\n",
305 man_id == 0x23 ? "ADM9240" :
306 man_id == 0xda ? "DS1780" : "LM81", die_rev);
307
308 strscpy(info->type, name, I2C_NAME_SIZE);
309
310 return 0;
311}
312
313static int adm9240_init_client(struct adm9240_data *data)
314{
315 unsigned int regval;
316 u8 conf, mode;
317 int err;
318
319 err = regmap_raw_read(data->regmap, ADM9240_REG_CONFIG, &conf, 1);
320 if (err < 0)
321 return err;
322 err = regmap_raw_read(data->regmap, ADM9240_REG_TEMP_CONF, &mode, 1);
323 if (err < 0)
324 return err;
325 mode &= 3;
326
327 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
328
329 dev_info(data->dev, "Using VRM: %d.%d\n", data->vrm / 10,
330 data->vrm % 10);
331
332 if (conf & 1) { /* measurement cycle running: report state */
333
334 dev_info(data->dev, "status: config 0x%02x mode %u\n",
335 conf, mode);
336
337 } else { /* cold start: open limits before starting chip */
338 int i;
339
340 for (i = 0; i < 6; i++) {
341 err = regmap_write(data->regmap,
342 ADM9240_REG_IN_MIN(i), 0);
343 if (err < 0)
344 return err;
345 err = regmap_write(data->regmap,
346 ADM9240_REG_IN_MAX(i), 255);
347 if (err < 0)
348 return err;
349 }
350 for (i = 0; i < 2; i++) {
351 err = regmap_write(data->regmap,
352 ADM9240_REG_FAN_MIN(i), 255);
353 if (err < 0)
354 return err;
355 }
356 for (i = 0; i < 2; i++) {
357 err = regmap_write(data->regmap,
358 ADM9240_REG_TEMP_MAX(i), 127);
359 if (err < 0)
360 return err;
361 }
362
363 /* start measurement cycle */
364 err = regmap_write(data->regmap, ADM9240_REG_CONFIG, 1);
365 if (err < 0)
366 return err;
367
368 dev_info(data->dev,
369 "cold start: config was 0x%02x mode %u\n", conf, mode);
370 }
371
372 /* read fan divs */
373 err = regmap_read(data->regmap, ADM9240_REG_VID_FAN_DIV, ®val);
374 if (err < 0)
375 return err;
376 data->fan_div[0] = (regval >> 4) & 3;
377 data->fan_div[1] = (regval >> 6) & 3;
378 return 0;
379}
380
381static int adm9240_chip_read(struct device *dev, u32 attr, long *val)
382{
383 struct adm9240_data *data = dev_get_drvdata(dev);
384 u8 regs[2];
385 int err;
386
387 switch (attr) {
388 case hwmon_chip_alarms:
389 err = regmap_bulk_read(data->regmap, ADM9240_REG_INT(0), ®s, 2);
390 if (err < 0)
391 return err;
392 *val = regs[0] | regs[1] << 8;
393 break;
394 default:
395 return -EOPNOTSUPP;
396 }
397 return 0;
398}
399
400static int adm9240_intrusion_read(struct device *dev, u32 attr, long *val)
401{
402 struct adm9240_data *data = dev_get_drvdata(dev);
403 unsigned int regval;
404 int err;
405
406 switch (attr) {
407 case hwmon_intrusion_alarm:
408 err = regmap_read(data->regmap, ADM9240_REG_INT(1), ®val);
409 if (err < 0)
410 return err;
411 *val = !!(regval & BIT(4));
412 break;
413 default:
414 return -EOPNOTSUPP;
415 }
416 return 0;
417}
418
419static int adm9240_intrusion_write(struct device *dev, u32 attr, long val)
420{
421 struct adm9240_data *data = dev_get_drvdata(dev);
422 int err;
423
424 switch (attr) {
425 case hwmon_intrusion_alarm:
426 if (val)
427 return -EINVAL;
428 err = regmap_write(data->regmap, ADM9240_REG_CHASSIS_CLEAR, 0x80);
429 if (err < 0)
430 return err;
431 dev_dbg(data->dev, "chassis intrusion latch cleared\n");
432 break;
433 default:
434 return -EOPNOTSUPP;
435 }
436 return 0;
437}
438
439static int adm9240_in_read(struct device *dev, u32 attr, int channel, long *val)
440{
441 struct adm9240_data *data = dev_get_drvdata(dev);
442 unsigned int regval;
443 int reg;
444 int err;
445
446 switch (attr) {
447 case hwmon_in_input:
448 reg = ADM9240_REG_IN(channel);
449 break;
450 case hwmon_in_min:
451 reg = ADM9240_REG_IN_MIN(channel);
452 break;
453 case hwmon_in_max:
454 reg = ADM9240_REG_IN_MAX(channel);
455 break;
456 case hwmon_in_alarm:
457 if (channel < 4) {
458 reg = ADM9240_REG_INT(0);
459 } else {
460 reg = ADM9240_REG_INT(1);
461 channel -= 4;
462 }
463 err = regmap_read(data->regmap, reg, ®val);
464 if (err < 0)
465 return err;
466 *val = !!(regval & BIT(channel));
467 return 0;
468 default:
469 return -EOPNOTSUPP;
470 }
471 err = regmap_read(data->regmap, reg, ®val);
472 if (err < 0)
473 return err;
474 *val = IN_FROM_REG(regval, channel);
475 return 0;
476}
477
478static int adm9240_in_write(struct device *dev, u32 attr, int channel, long val)
479{
480 struct adm9240_data *data = dev_get_drvdata(dev);
481 int reg;
482
483 switch (attr) {
484 case hwmon_in_min:
485 reg = ADM9240_REG_IN_MIN(channel);
486 break;
487 case hwmon_in_max:
488 reg = ADM9240_REG_IN_MAX(channel);
489 break;
490 default:
491 return -EOPNOTSUPP;
492 }
493 return regmap_write(data->regmap, reg, IN_TO_REG(val, channel));
494}
495
496static int adm9240_fan_read(struct device *dev, u32 attr, int channel, long *val)
497{
498 struct adm9240_data *data = dev_get_drvdata(dev);
499 unsigned int regval;
500 int err;
501
502 switch (attr) {
503 case hwmon_fan_input:
504 mutex_lock(&data->update_lock);
505 err = regmap_read(data->regmap, ADM9240_REG_FAN(channel), ®val);
506 if (err < 0) {
507 mutex_unlock(&data->update_lock);
508 return err;
509 }
510 if (regval == 255 && data->fan_div[channel] < 3) {
511 /* adjust fan clock divider on overflow */
512 err = adm9240_write_fan_div(data, channel,
513 ++data->fan_div[channel]);
514 if (err) {
515 mutex_unlock(&data->update_lock);
516 return err;
517 }
518 }
519 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
520 mutex_unlock(&data->update_lock);
521 break;
522 case hwmon_fan_div:
523 *val = BIT(data->fan_div[channel]);
524 break;
525 case hwmon_fan_min:
526 err = regmap_read(data->regmap, ADM9240_REG_FAN_MIN(channel), ®val);
527 if (err < 0)
528 return err;
529 *val = FAN_FROM_REG(regval, BIT(data->fan_div[channel]));
530 break;
531 case hwmon_fan_alarm:
532 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
533 if (err < 0)
534 return err;
535 *val = !!(regval & BIT(channel + 6));
536 break;
537 default:
538 return -EOPNOTSUPP;
539 }
540 return 0;
541}
542
543static int adm9240_fan_write(struct device *dev, u32 attr, int channel, long val)
544{
545 struct adm9240_data *data = dev_get_drvdata(dev);
546 int err;
547
548 switch (attr) {
549 case hwmon_fan_min:
550 err = adm9240_fan_min_write(data, channel, val);
551 if (err < 0)
552 return err;
553 break;
554 default:
555 return -EOPNOTSUPP;
556 }
557 return 0;
558}
559
560static int adm9240_temp_read(struct device *dev, u32 attr, int channel, long *val)
561{
562 struct adm9240_data *data = dev_get_drvdata(dev);
563 unsigned int regval;
564 int err, temp;
565
566 switch (attr) {
567 case hwmon_temp_input:
568 err = regmap_read(data->regmap, ADM9240_REG_TEMP, ®val);
569 if (err < 0)
570 return err;
571 temp = regval << 1;
572 err = regmap_read(data->regmap, ADM9240_REG_TEMP_CONF, ®val);
573 if (err < 0)
574 return err;
575 temp |= regval >> 7;
576 *val = sign_extend32(temp, 8) * 500;
577 break;
578 case hwmon_temp_max:
579 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(0), ®val);
580 if (err < 0)
581 return err;
582 *val = (s8)regval * 1000;
583 break;
584 case hwmon_temp_max_hyst:
585 err = regmap_read(data->regmap, ADM9240_REG_TEMP_MAX(1), ®val);
586 if (err < 0)
587 return err;
588 *val = (s8)regval * 1000;
589 break;
590 case hwmon_temp_alarm:
591 err = regmap_read(data->regmap, ADM9240_REG_INT(0), ®val);
592 if (err < 0)
593 return err;
594 *val = !!(regval & BIT(4));
595 break;
596 default:
597 return -EOPNOTSUPP;
598 }
599 return 0;
600}
601
602static int adm9240_temp_write(struct device *dev, u32 attr, int channel, long val)
603{
604 struct adm9240_data *data = dev_get_drvdata(dev);
605 int reg;
606
607 switch (attr) {
608 case hwmon_temp_max:
609 reg = ADM9240_REG_TEMP_MAX(0);
610 break;
611 case hwmon_temp_max_hyst:
612 reg = ADM9240_REG_TEMP_MAX(1);
613 break;
614 default:
615 return -EOPNOTSUPP;
616 }
617 return regmap_write(data->regmap, reg, TEMP_TO_REG(val));
618}
619
620static int adm9240_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
621 int channel, long *val)
622{
623 switch (type) {
624 case hwmon_chip:
625 return adm9240_chip_read(dev, attr, val);
626 case hwmon_intrusion:
627 return adm9240_intrusion_read(dev, attr, val);
628 case hwmon_in:
629 return adm9240_in_read(dev, attr, channel, val);
630 case hwmon_fan:
631 return adm9240_fan_read(dev, attr, channel, val);
632 case hwmon_temp:
633 return adm9240_temp_read(dev, attr, channel, val);
634 default:
635 return -EOPNOTSUPP;
636 }
637}
638
639static int adm9240_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
640 int channel, long val)
641{
642 switch (type) {
643 case hwmon_intrusion:
644 return adm9240_intrusion_write(dev, attr, val);
645 case hwmon_in:
646 return adm9240_in_write(dev, attr, channel, val);
647 case hwmon_fan:
648 return adm9240_fan_write(dev, attr, channel, val);
649 case hwmon_temp:
650 return adm9240_temp_write(dev, attr, channel, val);
651 default:
652 return -EOPNOTSUPP;
653 }
654}
655
656static umode_t adm9240_is_visible(const void *_data, enum hwmon_sensor_types type,
657 u32 attr, int channel)
658{
659 umode_t mode = 0;
660
661 switch (type) {
662 case hwmon_chip:
663 switch (attr) {
664 case hwmon_chip_alarms:
665 mode = 0444;
666 break;
667 default:
668 break;
669 }
670 break;
671 case hwmon_intrusion:
672 switch (attr) {
673 case hwmon_intrusion_alarm:
674 mode = 0644;
675 break;
676 default:
677 break;
678 }
679 break;
680 case hwmon_temp:
681 switch (attr) {
682 case hwmon_temp:
683 case hwmon_temp_alarm:
684 mode = 0444;
685 break;
686 case hwmon_temp_max:
687 case hwmon_temp_max_hyst:
688 mode = 0644;
689 break;
690 default:
691 break;
692 }
693 break;
694 case hwmon_fan:
695 switch (attr) {
696 case hwmon_fan_input:
697 case hwmon_fan_div:
698 case hwmon_fan_alarm:
699 mode = 0444;
700 break;
701 case hwmon_fan_min:
702 mode = 0644;
703 break;
704 default:
705 break;
706 }
707 break;
708 case hwmon_in:
709 switch (attr) {
710 case hwmon_in_input:
711 case hwmon_in_alarm:
712 mode = 0444;
713 break;
714 case hwmon_in_min:
715 case hwmon_in_max:
716 mode = 0644;
717 break;
718 default:
719 break;
720 }
721 break;
722 default:
723 break;
724 }
725 return mode;
726}
727
728static const struct hwmon_ops adm9240_hwmon_ops = {
729 .is_visible = adm9240_is_visible,
730 .read = adm9240_read,
731 .write = adm9240_write,
732};
733
734static const struct hwmon_channel_info *adm9240_info[] = {
735 HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
736 HWMON_CHANNEL_INFO(intrusion, HWMON_INTRUSION_ALARM),
737 HWMON_CHANNEL_INFO(temp,
738 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_ALARM),
739 HWMON_CHANNEL_INFO(in,
740 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
741 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
742 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
743 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
744 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
745 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM),
746 HWMON_CHANNEL_INFO(fan,
747 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM,
748 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_DIV | HWMON_F_ALARM),
749 NULL
750};
751
752static const struct hwmon_chip_info adm9240_chip_info = {
753 .ops = &adm9240_hwmon_ops,
754 .info = adm9240_info,
755};
756
757static bool adm9240_volatile_reg(struct device *dev, unsigned int reg)
758{
759 switch (reg) {
760 case ADM9240_REG_IN(0) ... ADM9240_REG_IN(5):
761 case ADM9240_REG_FAN(0) ... ADM9240_REG_FAN(1):
762 case ADM9240_REG_INT(0) ... ADM9240_REG_INT(1):
763 case ADM9240_REG_TEMP:
764 case ADM9240_REG_TEMP_CONF:
765 case ADM9240_REG_VID_FAN_DIV:
766 case ADM9240_REG_VID4:
767 case ADM9240_REG_ANALOG_OUT:
768 return true;
769 default:
770 return false;
771 }
772}
773
774static const struct regmap_config adm9240_regmap_config = {
775 .reg_bits = 8,
776 .val_bits = 8,
777 .use_single_read = true,
778 .use_single_write = true,
779 .volatile_reg = adm9240_volatile_reg,
780};
781
782static int adm9240_probe(struct i2c_client *client)
783{
784 struct device *dev = &client->dev;
785 struct device *hwmon_dev;
786 struct adm9240_data *data;
787 int err;
788
789 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
790 if (!data)
791 return -ENOMEM;
792
793 data->dev = dev;
794 mutex_init(&data->update_lock);
795 data->regmap = devm_regmap_init_i2c(client, &adm9240_regmap_config);
796 if (IS_ERR(data->regmap))
797 return PTR_ERR(data->regmap);
798
799 err = adm9240_init_client(data);
800 if (err < 0)
801 return err;
802
803 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
804 &adm9240_chip_info,
805 adm9240_groups);
806 return PTR_ERR_OR_ZERO(hwmon_dev);
807}
808
809static const struct i2c_device_id adm9240_id[] = {
810 { "adm9240", adm9240 },
811 { "ds1780", ds1780 },
812 { "lm81", lm81 },
813 { }
814};
815MODULE_DEVICE_TABLE(i2c, adm9240_id);
816
817static struct i2c_driver adm9240_driver = {
818 .class = I2C_CLASS_HWMON,
819 .driver = {
820 .name = "adm9240",
821 },
822 .probe_new = adm9240_probe,
823 .id_table = adm9240_id,
824 .detect = adm9240_detect,
825 .address_list = normal_i2c,
826};
827
828module_i2c_driver(adm9240_driver);
829
830MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
831 "Grant Coady <gcoady.lk@gmail.com> and others");
832MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
833MODULE_LICENSE("GPL");
1/*
2 * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 *
5 * Copyright (C) 1999 Frodo Looijaard <frodol@dds.nl>
6 * Philip Edelbrock <phil@netroedge.com>
7 * Copyright (C) 2003 Michiel Rook <michiel@grendelproject.nl>
8 * Copyright (C) 2005 Grant Coady <gcoady.lk@gmail.com> with valuable
9 * guidance from Jean Delvare
10 *
11 * Driver supports Analog Devices ADM9240
12 * Dallas Semiconductor DS1780
13 * National Semiconductor LM81
14 *
15 * ADM9240 is the reference, DS1780 and LM81 are register compatibles
16 *
17 * Voltage Six inputs are scaled by chip, VID also reported
18 * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
19 * Fans 2 fans, low speed alarm, automatic fan clock divider
20 * Alarms 16-bit map of active alarms
21 * Analog Out 0..1250 mV output
22 *
23 * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
24 *
25 * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
26 *
27 * LM81 extended temp reading not implemented
28 *
29 * This program is free software; you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation; either version 2 of the License, or
32 * (at your option) any later version.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * You should have received a copy of the GNU General Public License
40 * along with this program; if not, write to the Free Software
41 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
42 */
43
44#include <linux/init.h>
45#include <linux/module.h>
46#include <linux/slab.h>
47#include <linux/i2c.h>
48#include <linux/hwmon-sysfs.h>
49#include <linux/hwmon.h>
50#include <linux/hwmon-vid.h>
51#include <linux/err.h>
52#include <linux/mutex.h>
53#include <linux/jiffies.h>
54
55/* Addresses to scan */
56static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
57 I2C_CLIENT_END };
58
59enum chips { adm9240, ds1780, lm81 };
60
61/* ADM9240 registers */
62#define ADM9240_REG_MAN_ID 0x3e
63#define ADM9240_REG_DIE_REV 0x3f
64#define ADM9240_REG_CONFIG 0x40
65
66#define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
67#define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
68#define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
69#define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
70#define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
71#define ADM9240_REG_INT(nr) (0x41 + (nr))
72#define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
73#define ADM9240_REG_TEMP 0x27
74#define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
75#define ADM9240_REG_ANALOG_OUT 0x19
76#define ADM9240_REG_CHASSIS_CLEAR 0x46
77#define ADM9240_REG_VID_FAN_DIV 0x47
78#define ADM9240_REG_I2C_ADDR 0x48
79#define ADM9240_REG_VID4 0x49
80#define ADM9240_REG_TEMP_CONF 0x4b
81
82/* generalised scaling with integer rounding */
83static inline int SCALE(long val, int mul, int div)
84{
85 if (val < 0)
86 return (val * mul - div / 2) / div;
87 else
88 return (val * mul + div / 2) / div;
89}
90
91/* adm9240 internally scales voltage measurements */
92static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
93
94static inline unsigned int IN_FROM_REG(u8 reg, int n)
95{
96 return SCALE(reg, nom_mv[n], 192);
97}
98
99static inline u8 IN_TO_REG(unsigned long val, int n)
100{
101 return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
102}
103
104/* temperature range: -40..125, 127 disables temperature alarm */
105static inline s8 TEMP_TO_REG(long val)
106{
107 return clamp_val(SCALE(val, 1, 1000), -40, 127);
108}
109
110/* two fans, each with low fan speed limit */
111static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
112{
113 if (!reg) /* error */
114 return -1;
115
116 if (reg == 255)
117 return 0;
118
119 return SCALE(1350000, 1, reg * div);
120}
121
122/* analog out 0..1250mV */
123static inline u8 AOUT_TO_REG(unsigned long val)
124{
125 return clamp_val(SCALE(val, 255, 1250), 0, 255);
126}
127
128static inline unsigned int AOUT_FROM_REG(u8 reg)
129{
130 return SCALE(reg, 1250, 255);
131}
132
133static int adm9240_probe(struct i2c_client *client,
134 const struct i2c_device_id *id);
135static int adm9240_detect(struct i2c_client *client,
136 struct i2c_board_info *info);
137static void adm9240_init_client(struct i2c_client *client);
138static int adm9240_remove(struct i2c_client *client);
139static struct adm9240_data *adm9240_update_device(struct device *dev);
140
141/* driver data */
142static const struct i2c_device_id adm9240_id[] = {
143 { "adm9240", adm9240 },
144 { "ds1780", ds1780 },
145 { "lm81", lm81 },
146 { }
147};
148MODULE_DEVICE_TABLE(i2c, adm9240_id);
149
150static struct i2c_driver adm9240_driver = {
151 .class = I2C_CLASS_HWMON,
152 .driver = {
153 .name = "adm9240",
154 },
155 .probe = adm9240_probe,
156 .remove = adm9240_remove,
157 .id_table = adm9240_id,
158 .detect = adm9240_detect,
159 .address_list = normal_i2c,
160};
161
162/* per client data */
163struct adm9240_data {
164 struct device *hwmon_dev;
165 struct mutex update_lock;
166 char valid;
167 unsigned long last_updated_measure;
168 unsigned long last_updated_config;
169
170 u8 in[6]; /* ro in0_input */
171 u8 in_max[6]; /* rw in0_max */
172 u8 in_min[6]; /* rw in0_min */
173 u8 fan[2]; /* ro fan1_input */
174 u8 fan_min[2]; /* rw fan1_min */
175 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
176 s16 temp; /* ro temp1_input, 9-bit sign-extended */
177 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
178 u16 alarms; /* ro alarms */
179 u8 aout; /* rw aout_output */
180 u8 vid; /* ro vid */
181 u8 vrm; /* -- vrm set on startup, no accessor */
182};
183
184/*** sysfs accessors ***/
185
186/* temperature */
187static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
188 char *buf)
189{
190 struct adm9240_data *data = adm9240_update_device(dev);
191 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
192}
193
194static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
195 char *buf)
196{
197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
198 struct adm9240_data *data = adm9240_update_device(dev);
199 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
200}
201
202static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
203 const char *buf, size_t count)
204{
205 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
206 struct i2c_client *client = to_i2c_client(dev);
207 struct adm9240_data *data = i2c_get_clientdata(client);
208 long val;
209 int err;
210
211 err = kstrtol(buf, 10, &val);
212 if (err)
213 return err;
214
215 mutex_lock(&data->update_lock);
216 data->temp_max[attr->index] = TEMP_TO_REG(val);
217 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
218 data->temp_max[attr->index]);
219 mutex_unlock(&data->update_lock);
220 return count;
221}
222
223static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
224static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
225 show_max, set_max, 0);
226static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
227 show_max, set_max, 1);
228
229/* voltage */
230static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
231 char *buf)
232{
233 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
234 struct adm9240_data *data = adm9240_update_device(dev);
235 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
236 attr->index));
237}
238
239static ssize_t show_in_min(struct device *dev,
240 struct device_attribute *devattr, char *buf)
241{
242 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
243 struct adm9240_data *data = adm9240_update_device(dev);
244 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
245 attr->index));
246}
247
248static ssize_t show_in_max(struct device *dev,
249 struct device_attribute *devattr, char *buf)
250{
251 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
252 struct adm9240_data *data = adm9240_update_device(dev);
253 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
254 attr->index));
255}
256
257static ssize_t set_in_min(struct device *dev,
258 struct device_attribute *devattr,
259 const char *buf, size_t count)
260{
261 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
262 struct i2c_client *client = to_i2c_client(dev);
263 struct adm9240_data *data = i2c_get_clientdata(client);
264 unsigned long val;
265 int err;
266
267 err = kstrtoul(buf, 10, &val);
268 if (err)
269 return err;
270
271 mutex_lock(&data->update_lock);
272 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
273 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
274 data->in_min[attr->index]);
275 mutex_unlock(&data->update_lock);
276 return count;
277}
278
279static ssize_t set_in_max(struct device *dev,
280 struct device_attribute *devattr,
281 const char *buf, size_t count)
282{
283 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
284 struct i2c_client *client = to_i2c_client(dev);
285 struct adm9240_data *data = i2c_get_clientdata(client);
286 unsigned long val;
287 int err;
288
289 err = kstrtoul(buf, 10, &val);
290 if (err)
291 return err;
292
293 mutex_lock(&data->update_lock);
294 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
295 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
296 data->in_max[attr->index]);
297 mutex_unlock(&data->update_lock);
298 return count;
299}
300
301#define vin(nr) \
302static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
303 show_in, NULL, nr); \
304static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
305 show_in_min, set_in_min, nr); \
306static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
307 show_in_max, set_in_max, nr);
308
309vin(0);
310vin(1);
311vin(2);
312vin(3);
313vin(4);
314vin(5);
315
316/* fans */
317static ssize_t show_fan(struct device *dev,
318 struct device_attribute *devattr, char *buf)
319{
320 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
321 struct adm9240_data *data = adm9240_update_device(dev);
322 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
323 1 << data->fan_div[attr->index]));
324}
325
326static ssize_t show_fan_min(struct device *dev,
327 struct device_attribute *devattr, char *buf)
328{
329 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
330 struct adm9240_data *data = adm9240_update_device(dev);
331 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
332 1 << data->fan_div[attr->index]));
333}
334
335static ssize_t show_fan_div(struct device *dev,
336 struct device_attribute *devattr, char *buf)
337{
338 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
339 struct adm9240_data *data = adm9240_update_device(dev);
340 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
341}
342
343/* write new fan div, callers must hold data->update_lock */
344static void adm9240_write_fan_div(struct i2c_client *client, int nr,
345 u8 fan_div)
346{
347 u8 reg, old, shift = (nr + 2) * 2;
348
349 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
350 old = (reg >> shift) & 3;
351 reg &= ~(3 << shift);
352 reg |= (fan_div << shift);
353 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
354 dev_dbg(&client->dev,
355 "fan%d clock divider changed from %u to %u\n",
356 nr + 1, 1 << old, 1 << fan_div);
357}
358
359/*
360 * set fan speed low limit:
361 *
362 * - value is zero: disable fan speed low limit alarm
363 *
364 * - value is below fan speed measurement range: enable fan speed low
365 * limit alarm to be asserted while fan speed too slow to measure
366 *
367 * - otherwise: select fan clock divider to suit fan speed low limit,
368 * measurement code may adjust registers to ensure fan speed reading
369 */
370static ssize_t set_fan_min(struct device *dev,
371 struct device_attribute *devattr,
372 const char *buf, size_t count)
373{
374 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
375 struct i2c_client *client = to_i2c_client(dev);
376 struct adm9240_data *data = i2c_get_clientdata(client);
377 int nr = attr->index;
378 u8 new_div;
379 unsigned long val;
380 int err;
381
382 err = kstrtoul(buf, 10, &val);
383 if (err)
384 return err;
385
386 mutex_lock(&data->update_lock);
387
388 if (!val) {
389 data->fan_min[nr] = 255;
390 new_div = data->fan_div[nr];
391
392 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
393 nr + 1);
394
395 } else if (val < 1350000 / (8 * 254)) {
396 new_div = 3;
397 data->fan_min[nr] = 254;
398
399 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
400 nr + 1, FAN_FROM_REG(254, 1 << new_div));
401
402 } else {
403 unsigned int new_min = 1350000 / val;
404
405 new_div = 0;
406 while (new_min > 192 && new_div < 3) {
407 new_div++;
408 new_min /= 2;
409 }
410 if (!new_min) /* keep > 0 */
411 new_min++;
412
413 data->fan_min[nr] = new_min;
414
415 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
416 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
417 }
418
419 if (new_div != data->fan_div[nr]) {
420 data->fan_div[nr] = new_div;
421 adm9240_write_fan_div(client, nr, new_div);
422 }
423 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
424 data->fan_min[nr]);
425
426 mutex_unlock(&data->update_lock);
427 return count;
428}
429
430#define fan(nr) \
431static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
432 show_fan, NULL, nr - 1); \
433static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
434 show_fan_div, NULL, nr - 1); \
435static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
436 show_fan_min, set_fan_min, nr - 1);
437
438fan(1);
439fan(2);
440
441/* alarms */
442static ssize_t show_alarms(struct device *dev,
443 struct device_attribute *attr, char *buf)
444{
445 struct adm9240_data *data = adm9240_update_device(dev);
446 return sprintf(buf, "%u\n", data->alarms);
447}
448static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
449
450static ssize_t show_alarm(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
453 int bitnr = to_sensor_dev_attr(attr)->index;
454 struct adm9240_data *data = adm9240_update_device(dev);
455 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
456}
457static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
458static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
459static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
460static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
461static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
462static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
463static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
464static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
465static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
466
467/* vid */
468static ssize_t show_vid(struct device *dev,
469 struct device_attribute *attr, char *buf)
470{
471 struct adm9240_data *data = adm9240_update_device(dev);
472 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
473}
474static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
475
476/* analog output */
477static ssize_t show_aout(struct device *dev,
478 struct device_attribute *attr, char *buf)
479{
480 struct adm9240_data *data = adm9240_update_device(dev);
481 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
482}
483
484static ssize_t set_aout(struct device *dev,
485 struct device_attribute *attr,
486 const char *buf, size_t count)
487{
488 struct i2c_client *client = to_i2c_client(dev);
489 struct adm9240_data *data = i2c_get_clientdata(client);
490 long val;
491 int err;
492
493 err = kstrtol(buf, 10, &val);
494 if (err)
495 return err;
496
497 mutex_lock(&data->update_lock);
498 data->aout = AOUT_TO_REG(val);
499 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
500 mutex_unlock(&data->update_lock);
501 return count;
502}
503static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
504
505static ssize_t chassis_clear(struct device *dev,
506 struct device_attribute *attr,
507 const char *buf, size_t count)
508{
509 struct i2c_client *client = to_i2c_client(dev);
510 struct adm9240_data *data = i2c_get_clientdata(client);
511 unsigned long val;
512
513 if (kstrtoul(buf, 10, &val) || val != 0)
514 return -EINVAL;
515
516 mutex_lock(&data->update_lock);
517 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
518 data->valid = 0; /* Force cache refresh */
519 mutex_unlock(&data->update_lock);
520 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
521
522 return count;
523}
524static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
525 chassis_clear, 12);
526
527static struct attribute *adm9240_attributes[] = {
528 &sensor_dev_attr_in0_input.dev_attr.attr,
529 &sensor_dev_attr_in0_min.dev_attr.attr,
530 &sensor_dev_attr_in0_max.dev_attr.attr,
531 &sensor_dev_attr_in0_alarm.dev_attr.attr,
532 &sensor_dev_attr_in1_input.dev_attr.attr,
533 &sensor_dev_attr_in1_min.dev_attr.attr,
534 &sensor_dev_attr_in1_max.dev_attr.attr,
535 &sensor_dev_attr_in1_alarm.dev_attr.attr,
536 &sensor_dev_attr_in2_input.dev_attr.attr,
537 &sensor_dev_attr_in2_min.dev_attr.attr,
538 &sensor_dev_attr_in2_max.dev_attr.attr,
539 &sensor_dev_attr_in2_alarm.dev_attr.attr,
540 &sensor_dev_attr_in3_input.dev_attr.attr,
541 &sensor_dev_attr_in3_min.dev_attr.attr,
542 &sensor_dev_attr_in3_max.dev_attr.attr,
543 &sensor_dev_attr_in3_alarm.dev_attr.attr,
544 &sensor_dev_attr_in4_input.dev_attr.attr,
545 &sensor_dev_attr_in4_min.dev_attr.attr,
546 &sensor_dev_attr_in4_max.dev_attr.attr,
547 &sensor_dev_attr_in4_alarm.dev_attr.attr,
548 &sensor_dev_attr_in5_input.dev_attr.attr,
549 &sensor_dev_attr_in5_min.dev_attr.attr,
550 &sensor_dev_attr_in5_max.dev_attr.attr,
551 &sensor_dev_attr_in5_alarm.dev_attr.attr,
552 &dev_attr_temp1_input.attr,
553 &sensor_dev_attr_temp1_max.dev_attr.attr,
554 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
555 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
556 &sensor_dev_attr_fan1_input.dev_attr.attr,
557 &sensor_dev_attr_fan1_div.dev_attr.attr,
558 &sensor_dev_attr_fan1_min.dev_attr.attr,
559 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
560 &sensor_dev_attr_fan2_input.dev_attr.attr,
561 &sensor_dev_attr_fan2_div.dev_attr.attr,
562 &sensor_dev_attr_fan2_min.dev_attr.attr,
563 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
564 &dev_attr_alarms.attr,
565 &dev_attr_aout_output.attr,
566 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
567 &dev_attr_cpu0_vid.attr,
568 NULL
569};
570
571static const struct attribute_group adm9240_group = {
572 .attrs = adm9240_attributes,
573};
574
575
576/*** sensor chip detect and driver install ***/
577
578/* Return 0 if detection is successful, -ENODEV otherwise */
579static int adm9240_detect(struct i2c_client *new_client,
580 struct i2c_board_info *info)
581{
582 struct i2c_adapter *adapter = new_client->adapter;
583 const char *name = "";
584 int address = new_client->addr;
585 u8 man_id, die_rev;
586
587 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
588 return -ENODEV;
589
590 /* verify chip: reg address should match i2c address */
591 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
592 != address) {
593 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
594 address);
595 return -ENODEV;
596 }
597
598 /* check known chip manufacturer */
599 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
600 if (man_id == 0x23) {
601 name = "adm9240";
602 } else if (man_id == 0xda) {
603 name = "ds1780";
604 } else if (man_id == 0x01) {
605 name = "lm81";
606 } else {
607 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
608 man_id);
609 return -ENODEV;
610 }
611
612 /* successful detect, print chip info */
613 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
614 dev_info(&adapter->dev, "found %s revision %u\n",
615 man_id == 0x23 ? "ADM9240" :
616 man_id == 0xda ? "DS1780" : "LM81", die_rev);
617
618 strlcpy(info->type, name, I2C_NAME_SIZE);
619
620 return 0;
621}
622
623static int adm9240_probe(struct i2c_client *new_client,
624 const struct i2c_device_id *id)
625{
626 struct adm9240_data *data;
627 int err;
628
629 data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL);
630 if (!data)
631 return -ENOMEM;
632
633 i2c_set_clientdata(new_client, data);
634 mutex_init(&data->update_lock);
635
636 adm9240_init_client(new_client);
637
638 /* populate sysfs filesystem */
639 err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group);
640 if (err)
641 return err;
642
643 data->hwmon_dev = hwmon_device_register(&new_client->dev);
644 if (IS_ERR(data->hwmon_dev)) {
645 err = PTR_ERR(data->hwmon_dev);
646 goto exit_remove;
647 }
648
649 return 0;
650
651exit_remove:
652 sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
653 return err;
654}
655
656static int adm9240_remove(struct i2c_client *client)
657{
658 struct adm9240_data *data = i2c_get_clientdata(client);
659
660 hwmon_device_unregister(data->hwmon_dev);
661 sysfs_remove_group(&client->dev.kobj, &adm9240_group);
662
663 return 0;
664}
665
666static void adm9240_init_client(struct i2c_client *client)
667{
668 struct adm9240_data *data = i2c_get_clientdata(client);
669 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
670 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
671
672 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
673
674 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
675 data->vrm % 10);
676
677 if (conf & 1) { /* measurement cycle running: report state */
678
679 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
680 conf, mode);
681
682 } else { /* cold start: open limits before starting chip */
683 int i;
684
685 for (i = 0; i < 6; i++) {
686 i2c_smbus_write_byte_data(client,
687 ADM9240_REG_IN_MIN(i), 0);
688 i2c_smbus_write_byte_data(client,
689 ADM9240_REG_IN_MAX(i), 255);
690 }
691 i2c_smbus_write_byte_data(client,
692 ADM9240_REG_FAN_MIN(0), 255);
693 i2c_smbus_write_byte_data(client,
694 ADM9240_REG_FAN_MIN(1), 255);
695 i2c_smbus_write_byte_data(client,
696 ADM9240_REG_TEMP_MAX(0), 127);
697 i2c_smbus_write_byte_data(client,
698 ADM9240_REG_TEMP_MAX(1), 127);
699
700 /* start measurement cycle */
701 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
702
703 dev_info(&client->dev,
704 "cold start: config was 0x%02x mode %u\n", conf, mode);
705 }
706}
707
708static struct adm9240_data *adm9240_update_device(struct device *dev)
709{
710 struct i2c_client *client = to_i2c_client(dev);
711 struct adm9240_data *data = i2c_get_clientdata(client);
712 int i;
713
714 mutex_lock(&data->update_lock);
715
716 /* minimum measurement cycle: 1.75 seconds */
717 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
718 || !data->valid) {
719
720 for (i = 0; i < 6; i++) { /* read voltages */
721 data->in[i] = i2c_smbus_read_byte_data(client,
722 ADM9240_REG_IN(i));
723 }
724 data->alarms = i2c_smbus_read_byte_data(client,
725 ADM9240_REG_INT(0)) |
726 i2c_smbus_read_byte_data(client,
727 ADM9240_REG_INT(1)) << 8;
728
729 /*
730 * read temperature: assume temperature changes less than
731 * 0.5'C per two measurement cycles thus ignore possible
732 * but unlikely aliasing error on lsb reading. --Grant
733 */
734 data->temp = ((i2c_smbus_read_byte_data(client,
735 ADM9240_REG_TEMP) << 8) |
736 i2c_smbus_read_byte_data(client,
737 ADM9240_REG_TEMP_CONF)) / 128;
738
739 for (i = 0; i < 2; i++) { /* read fans */
740 data->fan[i] = i2c_smbus_read_byte_data(client,
741 ADM9240_REG_FAN(i));
742
743 /* adjust fan clock divider on overflow */
744 if (data->valid && data->fan[i] == 255 &&
745 data->fan_div[i] < 3) {
746
747 adm9240_write_fan_div(client, i,
748 ++data->fan_div[i]);
749
750 /* adjust fan_min if active, but not to 0 */
751 if (data->fan_min[i] < 255 &&
752 data->fan_min[i] >= 2)
753 data->fan_min[i] /= 2;
754 }
755 }
756 data->last_updated_measure = jiffies;
757 }
758
759 /* minimum config reading cycle: 300 seconds */
760 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
761 || !data->valid) {
762
763 for (i = 0; i < 6; i++) {
764 data->in_min[i] = i2c_smbus_read_byte_data(client,
765 ADM9240_REG_IN_MIN(i));
766 data->in_max[i] = i2c_smbus_read_byte_data(client,
767 ADM9240_REG_IN_MAX(i));
768 }
769 for (i = 0; i < 2; i++) {
770 data->fan_min[i] = i2c_smbus_read_byte_data(client,
771 ADM9240_REG_FAN_MIN(i));
772 }
773 data->temp_max[0] = i2c_smbus_read_byte_data(client,
774 ADM9240_REG_TEMP_MAX(0));
775 data->temp_max[1] = i2c_smbus_read_byte_data(client,
776 ADM9240_REG_TEMP_MAX(1));
777
778 /* read fan divs and 5-bit VID */
779 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
780 data->fan_div[0] = (i >> 4) & 3;
781 data->fan_div[1] = (i >> 6) & 3;
782 data->vid = i & 0x0f;
783 data->vid |= (i2c_smbus_read_byte_data(client,
784 ADM9240_REG_VID4) & 1) << 4;
785 /* read analog out */
786 data->aout = i2c_smbus_read_byte_data(client,
787 ADM9240_REG_ANALOG_OUT);
788
789 data->last_updated_config = jiffies;
790 data->valid = 1;
791 }
792 mutex_unlock(&data->update_lock);
793 return data;
794}
795
796module_i2c_driver(adm9240_driver);
797
798MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
799 "Grant Coady <gcoady.lk@gmail.com> and others");
800MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
801MODULE_LICENSE("GPL");