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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 * const 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 = 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
133/* per client data */
134struct adm9240_data {
135 struct i2c_client *client;
136 struct mutex update_lock;
137 char valid;
138 unsigned long last_updated_measure;
139 unsigned long last_updated_config;
140
141 u8 in[6]; /* ro in0_input */
142 u8 in_max[6]; /* rw in0_max */
143 u8 in_min[6]; /* rw in0_min */
144 u8 fan[2]; /* ro fan1_input */
145 u8 fan_min[2]; /* rw fan1_min */
146 u8 fan_div[2]; /* rw fan1_div, read-only accessor */
147 s16 temp; /* ro temp1_input, 9-bit sign-extended */
148 s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
149 u16 alarms; /* ro alarms */
150 u8 aout; /* rw aout_output */
151 u8 vid; /* ro vid */
152 u8 vrm; /* -- vrm set on startup, no accessor */
153};
154
155/* write new fan div, callers must hold data->update_lock */
156static void adm9240_write_fan_div(struct i2c_client *client, int nr,
157 u8 fan_div)
158{
159 u8 reg, old, shift = (nr + 2) * 2;
160
161 reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
162 old = (reg >> shift) & 3;
163 reg &= ~(3 << shift);
164 reg |= (fan_div << shift);
165 i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
166 dev_dbg(&client->dev,
167 "fan%d clock divider changed from %u to %u\n",
168 nr + 1, 1 << old, 1 << fan_div);
169}
170
171static struct adm9240_data *adm9240_update_device(struct device *dev)
172{
173 struct adm9240_data *data = dev_get_drvdata(dev);
174 struct i2c_client *client = data->client;
175 int i;
176
177 mutex_lock(&data->update_lock);
178
179 /* minimum measurement cycle: 1.75 seconds */
180 if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
181 || !data->valid) {
182
183 for (i = 0; i < 6; i++) { /* read voltages */
184 data->in[i] = i2c_smbus_read_byte_data(client,
185 ADM9240_REG_IN(i));
186 }
187 data->alarms = i2c_smbus_read_byte_data(client,
188 ADM9240_REG_INT(0)) |
189 i2c_smbus_read_byte_data(client,
190 ADM9240_REG_INT(1)) << 8;
191
192 /*
193 * read temperature: assume temperature changes less than
194 * 0.5'C per two measurement cycles thus ignore possible
195 * but unlikely aliasing error on lsb reading. --Grant
196 */
197 data->temp = ((i2c_smbus_read_byte_data(client,
198 ADM9240_REG_TEMP) << 8) |
199 i2c_smbus_read_byte_data(client,
200 ADM9240_REG_TEMP_CONF)) / 128;
201
202 for (i = 0; i < 2; i++) { /* read fans */
203 data->fan[i] = i2c_smbus_read_byte_data(client,
204 ADM9240_REG_FAN(i));
205
206 /* adjust fan clock divider on overflow */
207 if (data->valid && data->fan[i] == 255 &&
208 data->fan_div[i] < 3) {
209
210 adm9240_write_fan_div(client, i,
211 ++data->fan_div[i]);
212
213 /* adjust fan_min if active, but not to 0 */
214 if (data->fan_min[i] < 255 &&
215 data->fan_min[i] >= 2)
216 data->fan_min[i] /= 2;
217 }
218 }
219 data->last_updated_measure = jiffies;
220 }
221
222 /* minimum config reading cycle: 300 seconds */
223 if (time_after(jiffies, data->last_updated_config + (HZ * 300))
224 || !data->valid) {
225
226 for (i = 0; i < 6; i++) {
227 data->in_min[i] = i2c_smbus_read_byte_data(client,
228 ADM9240_REG_IN_MIN(i));
229 data->in_max[i] = i2c_smbus_read_byte_data(client,
230 ADM9240_REG_IN_MAX(i));
231 }
232 for (i = 0; i < 2; i++) {
233 data->fan_min[i] = i2c_smbus_read_byte_data(client,
234 ADM9240_REG_FAN_MIN(i));
235 }
236 data->temp_max[0] = i2c_smbus_read_byte_data(client,
237 ADM9240_REG_TEMP_MAX(0));
238 data->temp_max[1] = i2c_smbus_read_byte_data(client,
239 ADM9240_REG_TEMP_MAX(1));
240
241 /* read fan divs and 5-bit VID */
242 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
243 data->fan_div[0] = (i >> 4) & 3;
244 data->fan_div[1] = (i >> 6) & 3;
245 data->vid = i & 0x0f;
246 data->vid |= (i2c_smbus_read_byte_data(client,
247 ADM9240_REG_VID4) & 1) << 4;
248 /* read analog out */
249 data->aout = i2c_smbus_read_byte_data(client,
250 ADM9240_REG_ANALOG_OUT);
251
252 data->last_updated_config = jiffies;
253 data->valid = 1;
254 }
255 mutex_unlock(&data->update_lock);
256 return data;
257}
258
259/*** sysfs accessors ***/
260
261/* temperature */
262static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
263 char *buf)
264{
265 struct adm9240_data *data = adm9240_update_device(dev);
266 return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
267}
268
269static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
270 char *buf)
271{
272 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
273 struct adm9240_data *data = adm9240_update_device(dev);
274 return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
275}
276
277static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
278 const char *buf, size_t count)
279{
280 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
281 struct adm9240_data *data = dev_get_drvdata(dev);
282 struct i2c_client *client = data->client;
283 long val;
284 int err;
285
286 err = kstrtol(buf, 10, &val);
287 if (err)
288 return err;
289
290 mutex_lock(&data->update_lock);
291 data->temp_max[attr->index] = TEMP_TO_REG(val);
292 i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
293 data->temp_max[attr->index]);
294 mutex_unlock(&data->update_lock);
295 return count;
296}
297
298static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
299static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
300 show_max, set_max, 0);
301static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
302 show_max, set_max, 1);
303
304/* voltage */
305static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
306 char *buf)
307{
308 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
309 struct adm9240_data *data = adm9240_update_device(dev);
310 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
311 attr->index));
312}
313
314static ssize_t show_in_min(struct device *dev,
315 struct device_attribute *devattr, char *buf)
316{
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
318 struct adm9240_data *data = adm9240_update_device(dev);
319 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
320 attr->index));
321}
322
323static ssize_t show_in_max(struct device *dev,
324 struct device_attribute *devattr, char *buf)
325{
326 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
327 struct adm9240_data *data = adm9240_update_device(dev);
328 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
329 attr->index));
330}
331
332static ssize_t set_in_min(struct device *dev,
333 struct device_attribute *devattr,
334 const char *buf, size_t count)
335{
336 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
337 struct adm9240_data *data = dev_get_drvdata(dev);
338 struct i2c_client *client = data->client;
339 unsigned long val;
340 int err;
341
342 err = kstrtoul(buf, 10, &val);
343 if (err)
344 return err;
345
346 mutex_lock(&data->update_lock);
347 data->in_min[attr->index] = IN_TO_REG(val, attr->index);
348 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
349 data->in_min[attr->index]);
350 mutex_unlock(&data->update_lock);
351 return count;
352}
353
354static ssize_t set_in_max(struct device *dev,
355 struct device_attribute *devattr,
356 const char *buf, size_t count)
357{
358 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
359 struct adm9240_data *data = dev_get_drvdata(dev);
360 struct i2c_client *client = data->client;
361 unsigned long val;
362 int err;
363
364 err = kstrtoul(buf, 10, &val);
365 if (err)
366 return err;
367
368 mutex_lock(&data->update_lock);
369 data->in_max[attr->index] = IN_TO_REG(val, attr->index);
370 i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
371 data->in_max[attr->index]);
372 mutex_unlock(&data->update_lock);
373 return count;
374}
375
376#define vin(nr) \
377static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
378 show_in, NULL, nr); \
379static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
380 show_in_min, set_in_min, nr); \
381static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
382 show_in_max, set_in_max, nr);
383
384vin(0);
385vin(1);
386vin(2);
387vin(3);
388vin(4);
389vin(5);
390
391/* fans */
392static ssize_t show_fan(struct device *dev,
393 struct device_attribute *devattr, char *buf)
394{
395 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
396 struct adm9240_data *data = adm9240_update_device(dev);
397 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
398 1 << data->fan_div[attr->index]));
399}
400
401static ssize_t show_fan_min(struct device *dev,
402 struct device_attribute *devattr, char *buf)
403{
404 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
405 struct adm9240_data *data = adm9240_update_device(dev);
406 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
407 1 << data->fan_div[attr->index]));
408}
409
410static ssize_t show_fan_div(struct device *dev,
411 struct device_attribute *devattr, char *buf)
412{
413 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
414 struct adm9240_data *data = adm9240_update_device(dev);
415 return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
416}
417
418/*
419 * set fan speed low limit:
420 *
421 * - value is zero: disable fan speed low limit alarm
422 *
423 * - value is below fan speed measurement range: enable fan speed low
424 * limit alarm to be asserted while fan speed too slow to measure
425 *
426 * - otherwise: select fan clock divider to suit fan speed low limit,
427 * measurement code may adjust registers to ensure fan speed reading
428 */
429static ssize_t set_fan_min(struct device *dev,
430 struct device_attribute *devattr,
431 const char *buf, size_t count)
432{
433 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
434 struct adm9240_data *data = dev_get_drvdata(dev);
435 struct i2c_client *client = data->client;
436 int nr = attr->index;
437 u8 new_div;
438 unsigned long val;
439 int err;
440
441 err = kstrtoul(buf, 10, &val);
442 if (err)
443 return err;
444
445 mutex_lock(&data->update_lock);
446
447 if (!val) {
448 data->fan_min[nr] = 255;
449 new_div = data->fan_div[nr];
450
451 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
452 nr + 1);
453
454 } else if (val < 1350000 / (8 * 254)) {
455 new_div = 3;
456 data->fan_min[nr] = 254;
457
458 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
459 nr + 1, FAN_FROM_REG(254, 1 << new_div));
460
461 } else {
462 unsigned int new_min = 1350000 / val;
463
464 new_div = 0;
465 while (new_min > 192 && new_div < 3) {
466 new_div++;
467 new_min /= 2;
468 }
469 if (!new_min) /* keep > 0 */
470 new_min++;
471
472 data->fan_min[nr] = new_min;
473
474 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
475 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
476 }
477
478 if (new_div != data->fan_div[nr]) {
479 data->fan_div[nr] = new_div;
480 adm9240_write_fan_div(client, nr, new_div);
481 }
482 i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
483 data->fan_min[nr]);
484
485 mutex_unlock(&data->update_lock);
486 return count;
487}
488
489#define fan(nr) \
490static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
491 show_fan, NULL, nr - 1); \
492static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
493 show_fan_div, NULL, nr - 1); \
494static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
495 show_fan_min, set_fan_min, nr - 1);
496
497fan(1);
498fan(2);
499
500/* alarms */
501static ssize_t show_alarms(struct device *dev,
502 struct device_attribute *attr, char *buf)
503{
504 struct adm9240_data *data = adm9240_update_device(dev);
505 return sprintf(buf, "%u\n", data->alarms);
506}
507static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
508
509static ssize_t show_alarm(struct device *dev,
510 struct device_attribute *attr, char *buf)
511{
512 int bitnr = to_sensor_dev_attr(attr)->index;
513 struct adm9240_data *data = adm9240_update_device(dev);
514 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
515}
516static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
517static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
518static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
519static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
520static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
521static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
522static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
523static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
524static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
525
526/* vid */
527static ssize_t show_vid(struct device *dev,
528 struct device_attribute *attr, char *buf)
529{
530 struct adm9240_data *data = adm9240_update_device(dev);
531 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
532}
533static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
534
535/* analog output */
536static ssize_t show_aout(struct device *dev,
537 struct device_attribute *attr, char *buf)
538{
539 struct adm9240_data *data = adm9240_update_device(dev);
540 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
541}
542
543static ssize_t set_aout(struct device *dev,
544 struct device_attribute *attr,
545 const char *buf, size_t count)
546{
547 struct adm9240_data *data = dev_get_drvdata(dev);
548 struct i2c_client *client = data->client;
549 long val;
550 int err;
551
552 err = kstrtol(buf, 10, &val);
553 if (err)
554 return err;
555
556 mutex_lock(&data->update_lock);
557 data->aout = AOUT_TO_REG(val);
558 i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
559 mutex_unlock(&data->update_lock);
560 return count;
561}
562static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
563
564static ssize_t chassis_clear(struct device *dev,
565 struct device_attribute *attr,
566 const char *buf, size_t count)
567{
568 struct adm9240_data *data = dev_get_drvdata(dev);
569 struct i2c_client *client = data->client;
570 unsigned long val;
571
572 if (kstrtoul(buf, 10, &val) || val != 0)
573 return -EINVAL;
574
575 mutex_lock(&data->update_lock);
576 i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
577 data->valid = 0; /* Force cache refresh */
578 mutex_unlock(&data->update_lock);
579 dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
580
581 return count;
582}
583static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
584 chassis_clear, 12);
585
586static struct attribute *adm9240_attrs[] = {
587 &sensor_dev_attr_in0_input.dev_attr.attr,
588 &sensor_dev_attr_in0_min.dev_attr.attr,
589 &sensor_dev_attr_in0_max.dev_attr.attr,
590 &sensor_dev_attr_in0_alarm.dev_attr.attr,
591 &sensor_dev_attr_in1_input.dev_attr.attr,
592 &sensor_dev_attr_in1_min.dev_attr.attr,
593 &sensor_dev_attr_in1_max.dev_attr.attr,
594 &sensor_dev_attr_in1_alarm.dev_attr.attr,
595 &sensor_dev_attr_in2_input.dev_attr.attr,
596 &sensor_dev_attr_in2_min.dev_attr.attr,
597 &sensor_dev_attr_in2_max.dev_attr.attr,
598 &sensor_dev_attr_in2_alarm.dev_attr.attr,
599 &sensor_dev_attr_in3_input.dev_attr.attr,
600 &sensor_dev_attr_in3_min.dev_attr.attr,
601 &sensor_dev_attr_in3_max.dev_attr.attr,
602 &sensor_dev_attr_in3_alarm.dev_attr.attr,
603 &sensor_dev_attr_in4_input.dev_attr.attr,
604 &sensor_dev_attr_in4_min.dev_attr.attr,
605 &sensor_dev_attr_in4_max.dev_attr.attr,
606 &sensor_dev_attr_in4_alarm.dev_attr.attr,
607 &sensor_dev_attr_in5_input.dev_attr.attr,
608 &sensor_dev_attr_in5_min.dev_attr.attr,
609 &sensor_dev_attr_in5_max.dev_attr.attr,
610 &sensor_dev_attr_in5_alarm.dev_attr.attr,
611 &dev_attr_temp1_input.attr,
612 &sensor_dev_attr_temp1_max.dev_attr.attr,
613 &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
614 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
615 &sensor_dev_attr_fan1_input.dev_attr.attr,
616 &sensor_dev_attr_fan1_div.dev_attr.attr,
617 &sensor_dev_attr_fan1_min.dev_attr.attr,
618 &sensor_dev_attr_fan1_alarm.dev_attr.attr,
619 &sensor_dev_attr_fan2_input.dev_attr.attr,
620 &sensor_dev_attr_fan2_div.dev_attr.attr,
621 &sensor_dev_attr_fan2_min.dev_attr.attr,
622 &sensor_dev_attr_fan2_alarm.dev_attr.attr,
623 &dev_attr_alarms.attr,
624 &dev_attr_aout_output.attr,
625 &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
626 &dev_attr_cpu0_vid.attr,
627 NULL
628};
629
630ATTRIBUTE_GROUPS(adm9240);
631
632
633/*** sensor chip detect and driver install ***/
634
635/* Return 0 if detection is successful, -ENODEV otherwise */
636static int adm9240_detect(struct i2c_client *new_client,
637 struct i2c_board_info *info)
638{
639 struct i2c_adapter *adapter = new_client->adapter;
640 const char *name = "";
641 int address = new_client->addr;
642 u8 man_id, die_rev;
643
644 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
645 return -ENODEV;
646
647 /* verify chip: reg address should match i2c address */
648 if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
649 != address) {
650 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
651 address);
652 return -ENODEV;
653 }
654
655 /* check known chip manufacturer */
656 man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
657 if (man_id == 0x23) {
658 name = "adm9240";
659 } else if (man_id == 0xda) {
660 name = "ds1780";
661 } else if (man_id == 0x01) {
662 name = "lm81";
663 } else {
664 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
665 man_id);
666 return -ENODEV;
667 }
668
669 /* successful detect, print chip info */
670 die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
671 dev_info(&adapter->dev, "found %s revision %u\n",
672 man_id == 0x23 ? "ADM9240" :
673 man_id == 0xda ? "DS1780" : "LM81", die_rev);
674
675 strlcpy(info->type, name, I2C_NAME_SIZE);
676
677 return 0;
678}
679
680static void adm9240_init_client(struct i2c_client *client)
681{
682 struct adm9240_data *data = i2c_get_clientdata(client);
683 u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
684 u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
685
686 data->vrm = vid_which_vrm(); /* need this to report vid as mV */
687
688 dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
689 data->vrm % 10);
690
691 if (conf & 1) { /* measurement cycle running: report state */
692
693 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
694 conf, mode);
695
696 } else { /* cold start: open limits before starting chip */
697 int i;
698
699 for (i = 0; i < 6; i++) {
700 i2c_smbus_write_byte_data(client,
701 ADM9240_REG_IN_MIN(i), 0);
702 i2c_smbus_write_byte_data(client,
703 ADM9240_REG_IN_MAX(i), 255);
704 }
705 i2c_smbus_write_byte_data(client,
706 ADM9240_REG_FAN_MIN(0), 255);
707 i2c_smbus_write_byte_data(client,
708 ADM9240_REG_FAN_MIN(1), 255);
709 i2c_smbus_write_byte_data(client,
710 ADM9240_REG_TEMP_MAX(0), 127);
711 i2c_smbus_write_byte_data(client,
712 ADM9240_REG_TEMP_MAX(1), 127);
713
714 /* start measurement cycle */
715 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
716
717 dev_info(&client->dev,
718 "cold start: config was 0x%02x mode %u\n", conf, mode);
719 }
720}
721
722static int adm9240_probe(struct i2c_client *new_client,
723 const struct i2c_device_id *id)
724{
725 struct device *dev = &new_client->dev;
726 struct device *hwmon_dev;
727 struct adm9240_data *data;
728
729 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
730 if (!data)
731 return -ENOMEM;
732
733 i2c_set_clientdata(new_client, data);
734 data->client = new_client;
735 mutex_init(&data->update_lock);
736
737 adm9240_init_client(new_client);
738
739 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
740 new_client->name,
741 data,
742 adm9240_groups);
743 return PTR_ERR_OR_ZERO(hwmon_dev);
744}
745
746static const struct i2c_device_id adm9240_id[] = {
747 { "adm9240", adm9240 },
748 { "ds1780", ds1780 },
749 { "lm81", lm81 },
750 { }
751};
752MODULE_DEVICE_TABLE(i2c, adm9240_id);
753
754static struct i2c_driver adm9240_driver = {
755 .class = I2C_CLASS_HWMON,
756 .driver = {
757 .name = "adm9240",
758 },
759 .probe = adm9240_probe,
760 .id_table = adm9240_id,
761 .detect = adm9240_detect,
762 .address_list = normal_i2c,
763};
764
765module_i2c_driver(adm9240_driver);
766
767MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
768 "Grant Coady <gcoady.lk@gmail.com> and others");
769MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
770MODULE_LICENSE("GPL");