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hwmon: (pmbus) Use krealloc to allocate attribute memory
[mirror_ubuntu-zesty-kernel.git] / drivers / hwmon / pmbus / pmbus_core.c
1 /*
2 * Hardware monitoring driver for PMBus devices
3 *
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/jiffies.h>
30 #include <linux/i2c/pmbus.h>
31 #include "pmbus.h"
32
33 /*
34 * Number of additional attribute pointers to allocate
35 * with each call to krealloc
36 */
37 #define PMBUS_ATTR_ALLOC_SIZE 32
38
39 /*
40 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
41 * are paged. status_input is unpaged.
42 */
43 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
44
45 /*
46 * Index into status register array, per status register group
47 */
48 #define PB_STATUS_BASE 0
49 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
50 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
51 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
52 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
53 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
54 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
55
56 #define PMBUS_NAME_SIZE 24
57
58 struct pmbus_sensor {
59 struct pmbus_sensor *next;
60 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
61 struct device_attribute attribute;
62 u8 page; /* page number */
63 u16 reg; /* register */
64 enum pmbus_sensor_classes class; /* sensor class */
65 bool update; /* runtime sensor update needed */
66 int data; /* Sensor data.
67 Negative if there was a read error */
68 };
69 #define to_pmbus_sensor(_attr) \
70 container_of(_attr, struct pmbus_sensor, attribute)
71
72 struct pmbus_boolean {
73 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
74 struct sensor_device_attribute attribute;
75 struct pmbus_sensor *s1;
76 struct pmbus_sensor *s2;
77 };
78 #define to_pmbus_boolean(_attr) \
79 container_of(_attr, struct pmbus_boolean, attribute)
80
81 struct pmbus_label {
82 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
83 struct device_attribute attribute;
84 char label[PMBUS_NAME_SIZE]; /* label */
85 };
86 #define to_pmbus_label(_attr) \
87 container_of(_attr, struct pmbus_label, attribute)
88
89 struct pmbus_data {
90 struct device *dev;
91 struct device *hwmon_dev;
92
93 u32 flags; /* from platform data */
94
95 int exponent; /* linear mode: exponent for output voltages */
96
97 const struct pmbus_driver_info *info;
98
99 int max_attributes;
100 int num_attributes;
101 struct attribute_group group;
102
103 struct pmbus_sensor *sensors;
104
105 struct mutex update_lock;
106 bool valid;
107 unsigned long last_updated; /* in jiffies */
108
109 /*
110 * A single status register covers multiple attributes,
111 * so we keep them all together.
112 */
113 u8 status[PB_NUM_STATUS_REG];
114
115 u8 currpage;
116 };
117
118 int pmbus_set_page(struct i2c_client *client, u8 page)
119 {
120 struct pmbus_data *data = i2c_get_clientdata(client);
121 int rv = 0;
122 int newpage;
123
124 if (page != data->currpage) {
125 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
126 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
127 if (newpage != page)
128 rv = -EIO;
129 else
130 data->currpage = page;
131 }
132 return rv;
133 }
134 EXPORT_SYMBOL_GPL(pmbus_set_page);
135
136 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
137 {
138 int rv;
139
140 if (page >= 0) {
141 rv = pmbus_set_page(client, page);
142 if (rv < 0)
143 return rv;
144 }
145
146 return i2c_smbus_write_byte(client, value);
147 }
148 EXPORT_SYMBOL_GPL(pmbus_write_byte);
149
150 /*
151 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
152 * a device specific mapping funcion exists and calls it if necessary.
153 */
154 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
155 {
156 struct pmbus_data *data = i2c_get_clientdata(client);
157 const struct pmbus_driver_info *info = data->info;
158 int status;
159
160 if (info->write_byte) {
161 status = info->write_byte(client, page, value);
162 if (status != -ENODATA)
163 return status;
164 }
165 return pmbus_write_byte(client, page, value);
166 }
167
168 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
169 {
170 int rv;
171
172 rv = pmbus_set_page(client, page);
173 if (rv < 0)
174 return rv;
175
176 return i2c_smbus_write_word_data(client, reg, word);
177 }
178 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
179
180 /*
181 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
182 * a device specific mapping function exists and calls it if necessary.
183 */
184 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
185 u16 word)
186 {
187 struct pmbus_data *data = i2c_get_clientdata(client);
188 const struct pmbus_driver_info *info = data->info;
189 int status;
190
191 if (info->write_word_data) {
192 status = info->write_word_data(client, page, reg, word);
193 if (status != -ENODATA)
194 return status;
195 }
196 if (reg >= PMBUS_VIRT_BASE)
197 return -ENXIO;
198 return pmbus_write_word_data(client, page, reg, word);
199 }
200
201 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
202 {
203 int rv;
204
205 rv = pmbus_set_page(client, page);
206 if (rv < 0)
207 return rv;
208
209 return i2c_smbus_read_word_data(client, reg);
210 }
211 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
212
213 /*
214 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
215 * a device specific mapping function exists and calls it if necessary.
216 */
217 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
218 {
219 struct pmbus_data *data = i2c_get_clientdata(client);
220 const struct pmbus_driver_info *info = data->info;
221 int status;
222
223 if (info->read_word_data) {
224 status = info->read_word_data(client, page, reg);
225 if (status != -ENODATA)
226 return status;
227 }
228 if (reg >= PMBUS_VIRT_BASE)
229 return -ENXIO;
230 return pmbus_read_word_data(client, page, reg);
231 }
232
233 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
234 {
235 int rv;
236
237 if (page >= 0) {
238 rv = pmbus_set_page(client, page);
239 if (rv < 0)
240 return rv;
241 }
242
243 return i2c_smbus_read_byte_data(client, reg);
244 }
245 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
246
247 /*
248 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
249 * a device specific mapping function exists and calls it if necessary.
250 */
251 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
252 {
253 struct pmbus_data *data = i2c_get_clientdata(client);
254 const struct pmbus_driver_info *info = data->info;
255 int status;
256
257 if (info->read_byte_data) {
258 status = info->read_byte_data(client, page, reg);
259 if (status != -ENODATA)
260 return status;
261 }
262 return pmbus_read_byte_data(client, page, reg);
263 }
264
265 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
266 {
267 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
268 }
269
270 void pmbus_clear_faults(struct i2c_client *client)
271 {
272 struct pmbus_data *data = i2c_get_clientdata(client);
273 int i;
274
275 for (i = 0; i < data->info->pages; i++)
276 pmbus_clear_fault_page(client, i);
277 }
278 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
279
280 static int pmbus_check_status_cml(struct i2c_client *client)
281 {
282 int status, status2;
283
284 status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE);
285 if (status < 0 || (status & PB_STATUS_CML)) {
286 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
287 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
288 return -EIO;
289 }
290 return 0;
291 }
292
293 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
294 {
295 int rv;
296 struct pmbus_data *data = i2c_get_clientdata(client);
297
298 rv = _pmbus_read_byte_data(client, page, reg);
299 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
300 rv = pmbus_check_status_cml(client);
301 pmbus_clear_fault_page(client, -1);
302 return rv >= 0;
303 }
304 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
305
306 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
307 {
308 int rv;
309 struct pmbus_data *data = i2c_get_clientdata(client);
310
311 rv = _pmbus_read_word_data(client, page, reg);
312 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
313 rv = pmbus_check_status_cml(client);
314 pmbus_clear_fault_page(client, -1);
315 return rv >= 0;
316 }
317 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
318
319 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
320 {
321 struct pmbus_data *data = i2c_get_clientdata(client);
322
323 return data->info;
324 }
325 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
326
327 static struct pmbus_data *pmbus_update_device(struct device *dev)
328 {
329 struct i2c_client *client = to_i2c_client(dev);
330 struct pmbus_data *data = i2c_get_clientdata(client);
331 const struct pmbus_driver_info *info = data->info;
332 struct pmbus_sensor *sensor;
333
334 mutex_lock(&data->update_lock);
335 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
336 int i;
337
338 for (i = 0; i < info->pages; i++)
339 data->status[PB_STATUS_BASE + i]
340 = _pmbus_read_byte_data(client, i,
341 PMBUS_STATUS_BYTE);
342 for (i = 0; i < info->pages; i++) {
343 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
344 continue;
345 data->status[PB_STATUS_VOUT_BASE + i]
346 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT);
347 }
348 for (i = 0; i < info->pages; i++) {
349 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
350 continue;
351 data->status[PB_STATUS_IOUT_BASE + i]
352 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT);
353 }
354 for (i = 0; i < info->pages; i++) {
355 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
356 continue;
357 data->status[PB_STATUS_TEMP_BASE + i]
358 = _pmbus_read_byte_data(client, i,
359 PMBUS_STATUS_TEMPERATURE);
360 }
361 for (i = 0; i < info->pages; i++) {
362 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
363 continue;
364 data->status[PB_STATUS_FAN_BASE + i]
365 = _pmbus_read_byte_data(client, i,
366 PMBUS_STATUS_FAN_12);
367 }
368
369 for (i = 0; i < info->pages; i++) {
370 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
371 continue;
372 data->status[PB_STATUS_FAN34_BASE + i]
373 = _pmbus_read_byte_data(client, i,
374 PMBUS_STATUS_FAN_34);
375 }
376
377 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
378 data->status[PB_STATUS_INPUT_BASE]
379 = _pmbus_read_byte_data(client, 0,
380 PMBUS_STATUS_INPUT);
381
382 for (sensor = data->sensors; sensor; sensor = sensor->next) {
383 if (!data->valid || sensor->update)
384 sensor->data
385 = _pmbus_read_word_data(client,
386 sensor->page,
387 sensor->reg);
388 }
389 pmbus_clear_faults(client);
390 data->last_updated = jiffies;
391 data->valid = 1;
392 }
393 mutex_unlock(&data->update_lock);
394 return data;
395 }
396
397 /*
398 * Convert linear sensor values to milli- or micro-units
399 * depending on sensor type.
400 */
401 static long pmbus_reg2data_linear(struct pmbus_data *data,
402 struct pmbus_sensor *sensor)
403 {
404 s16 exponent;
405 s32 mantissa;
406 long val;
407
408 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
409 exponent = data->exponent;
410 mantissa = (u16) sensor->data;
411 } else { /* LINEAR11 */
412 exponent = ((s16)sensor->data) >> 11;
413 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
414 }
415
416 val = mantissa;
417
418 /* scale result to milli-units for all sensors except fans */
419 if (sensor->class != PSC_FAN)
420 val = val * 1000L;
421
422 /* scale result to micro-units for power sensors */
423 if (sensor->class == PSC_POWER)
424 val = val * 1000L;
425
426 if (exponent >= 0)
427 val <<= exponent;
428 else
429 val >>= -exponent;
430
431 return val;
432 }
433
434 /*
435 * Convert direct sensor values to milli- or micro-units
436 * depending on sensor type.
437 */
438 static long pmbus_reg2data_direct(struct pmbus_data *data,
439 struct pmbus_sensor *sensor)
440 {
441 long val = (s16) sensor->data;
442 long m, b, R;
443
444 m = data->info->m[sensor->class];
445 b = data->info->b[sensor->class];
446 R = data->info->R[sensor->class];
447
448 if (m == 0)
449 return 0;
450
451 /* X = 1/m * (Y * 10^-R - b) */
452 R = -R;
453 /* scale result to milli-units for everything but fans */
454 if (sensor->class != PSC_FAN) {
455 R += 3;
456 b *= 1000;
457 }
458
459 /* scale result to micro-units for power sensors */
460 if (sensor->class == PSC_POWER) {
461 R += 3;
462 b *= 1000;
463 }
464
465 while (R > 0) {
466 val *= 10;
467 R--;
468 }
469 while (R < 0) {
470 val = DIV_ROUND_CLOSEST(val, 10);
471 R++;
472 }
473
474 return (val - b) / m;
475 }
476
477 /*
478 * Convert VID sensor values to milli- or micro-units
479 * depending on sensor type.
480 * We currently only support VR11.
481 */
482 static long pmbus_reg2data_vid(struct pmbus_data *data,
483 struct pmbus_sensor *sensor)
484 {
485 long val = sensor->data;
486
487 if (val < 0x02 || val > 0xb2)
488 return 0;
489 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
490 }
491
492 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
493 {
494 long val;
495
496 switch (data->info->format[sensor->class]) {
497 case direct:
498 val = pmbus_reg2data_direct(data, sensor);
499 break;
500 case vid:
501 val = pmbus_reg2data_vid(data, sensor);
502 break;
503 case linear:
504 default:
505 val = pmbus_reg2data_linear(data, sensor);
506 break;
507 }
508 return val;
509 }
510
511 #define MAX_MANTISSA (1023 * 1000)
512 #define MIN_MANTISSA (511 * 1000)
513
514 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
515 enum pmbus_sensor_classes class, long val)
516 {
517 s16 exponent = 0, mantissa;
518 bool negative = false;
519
520 /* simple case */
521 if (val == 0)
522 return 0;
523
524 if (class == PSC_VOLTAGE_OUT) {
525 /* LINEAR16 does not support negative voltages */
526 if (val < 0)
527 return 0;
528
529 /*
530 * For a static exponents, we don't have a choice
531 * but to adjust the value to it.
532 */
533 if (data->exponent < 0)
534 val <<= -data->exponent;
535 else
536 val >>= data->exponent;
537 val = DIV_ROUND_CLOSEST(val, 1000);
538 return val & 0xffff;
539 }
540
541 if (val < 0) {
542 negative = true;
543 val = -val;
544 }
545
546 /* Power is in uW. Convert to mW before converting. */
547 if (class == PSC_POWER)
548 val = DIV_ROUND_CLOSEST(val, 1000L);
549
550 /*
551 * For simplicity, convert fan data to milli-units
552 * before calculating the exponent.
553 */
554 if (class == PSC_FAN)
555 val = val * 1000;
556
557 /* Reduce large mantissa until it fits into 10 bit */
558 while (val >= MAX_MANTISSA && exponent < 15) {
559 exponent++;
560 val >>= 1;
561 }
562 /* Increase small mantissa to improve precision */
563 while (val < MIN_MANTISSA && exponent > -15) {
564 exponent--;
565 val <<= 1;
566 }
567
568 /* Convert mantissa from milli-units to units */
569 mantissa = DIV_ROUND_CLOSEST(val, 1000);
570
571 /* Ensure that resulting number is within range */
572 if (mantissa > 0x3ff)
573 mantissa = 0x3ff;
574
575 /* restore sign */
576 if (negative)
577 mantissa = -mantissa;
578
579 /* Convert to 5 bit exponent, 11 bit mantissa */
580 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
581 }
582
583 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
584 enum pmbus_sensor_classes class, long val)
585 {
586 long m, b, R;
587
588 m = data->info->m[class];
589 b = data->info->b[class];
590 R = data->info->R[class];
591
592 /* Power is in uW. Adjust R and b. */
593 if (class == PSC_POWER) {
594 R -= 3;
595 b *= 1000;
596 }
597
598 /* Calculate Y = (m * X + b) * 10^R */
599 if (class != PSC_FAN) {
600 R -= 3; /* Adjust R and b for data in milli-units */
601 b *= 1000;
602 }
603 val = val * m + b;
604
605 while (R > 0) {
606 val *= 10;
607 R--;
608 }
609 while (R < 0) {
610 val = DIV_ROUND_CLOSEST(val, 10);
611 R++;
612 }
613
614 return val;
615 }
616
617 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
618 enum pmbus_sensor_classes class, long val)
619 {
620 val = clamp_val(val, 500, 1600);
621
622 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
623 }
624
625 static u16 pmbus_data2reg(struct pmbus_data *data,
626 enum pmbus_sensor_classes class, long val)
627 {
628 u16 regval;
629
630 switch (data->info->format[class]) {
631 case direct:
632 regval = pmbus_data2reg_direct(data, class, val);
633 break;
634 case vid:
635 regval = pmbus_data2reg_vid(data, class, val);
636 break;
637 case linear:
638 default:
639 regval = pmbus_data2reg_linear(data, class, val);
640 break;
641 }
642 return regval;
643 }
644
645 /*
646 * Return boolean calculated from converted data.
647 * <index> defines a status register index and mask.
648 * The mask is in the lower 8 bits, the register index is in bits 8..23.
649 *
650 * The associated pmbus_boolean structure contains optional pointers to two
651 * sensor attributes. If specified, those attributes are compared against each
652 * other to determine if a limit has been exceeded.
653 *
654 * If the sensor attribute pointers are NULL, the function returns true if
655 * (status[reg] & mask) is true.
656 *
657 * If sensor attribute pointers are provided, a comparison against a specified
658 * limit has to be performed to determine the boolean result.
659 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
660 * sensor values referenced by sensor attribute pointers s1 and s2).
661 *
662 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
663 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
664 *
665 * If a negative value is stored in any of the referenced registers, this value
666 * reflects an error code which will be returned.
667 */
668 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
669 int index)
670 {
671 struct pmbus_sensor *s1 = b->s1;
672 struct pmbus_sensor *s2 = b->s2;
673 u16 reg = (index >> 8) & 0xffff;
674 u8 mask = index & 0xff;
675 int ret, status;
676 u8 regval;
677
678 status = data->status[reg];
679 if (status < 0)
680 return status;
681
682 regval = status & mask;
683 if (!s1 && !s2) {
684 ret = !!regval;
685 } else if (!s1 || !s2) {
686 BUG();
687 return 0;
688 } else {
689 long v1, v2;
690
691 if (s1->data < 0)
692 return s1->data;
693 if (s2->data < 0)
694 return s2->data;
695
696 v1 = pmbus_reg2data(data, s1);
697 v2 = pmbus_reg2data(data, s2);
698 ret = !!(regval && v1 >= v2);
699 }
700 return ret;
701 }
702
703 static ssize_t pmbus_show_boolean(struct device *dev,
704 struct device_attribute *da, char *buf)
705 {
706 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
707 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
708 struct pmbus_data *data = pmbus_update_device(dev);
709 int val;
710
711 val = pmbus_get_boolean(data, boolean, attr->index);
712 if (val < 0)
713 return val;
714 return snprintf(buf, PAGE_SIZE, "%d\n", val);
715 }
716
717 static ssize_t pmbus_show_sensor(struct device *dev,
718 struct device_attribute *devattr, char *buf)
719 {
720 struct pmbus_data *data = pmbus_update_device(dev);
721 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
722
723 if (sensor->data < 0)
724 return sensor->data;
725
726 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
727 }
728
729 static ssize_t pmbus_set_sensor(struct device *dev,
730 struct device_attribute *devattr,
731 const char *buf, size_t count)
732 {
733 struct i2c_client *client = to_i2c_client(dev);
734 struct pmbus_data *data = i2c_get_clientdata(client);
735 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
736 ssize_t rv = count;
737 long val = 0;
738 int ret;
739 u16 regval;
740
741 if (kstrtol(buf, 10, &val) < 0)
742 return -EINVAL;
743
744 mutex_lock(&data->update_lock);
745 regval = pmbus_data2reg(data, sensor->class, val);
746 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
747 if (ret < 0)
748 rv = ret;
749 else
750 sensor->data = regval;
751 mutex_unlock(&data->update_lock);
752 return rv;
753 }
754
755 static ssize_t pmbus_show_label(struct device *dev,
756 struct device_attribute *da, char *buf)
757 {
758 struct pmbus_label *label = to_pmbus_label(da);
759
760 return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
761 }
762
763 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
764 {
765 if (data->num_attributes >= data->max_attributes - 1) {
766 data->max_attributes += PMBUS_ATTR_ALLOC_SIZE;
767 data->group.attrs = krealloc(data->group.attrs,
768 sizeof(struct attribute *) *
769 data->max_attributes, GFP_KERNEL);
770 if (data->group.attrs == NULL)
771 return -ENOMEM;
772 }
773
774 data->group.attrs[data->num_attributes++] = attr;
775 data->group.attrs[data->num_attributes] = NULL;
776 return 0;
777 }
778
779 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
780 const char *name,
781 umode_t mode,
782 ssize_t (*show)(struct device *dev,
783 struct device_attribute *attr,
784 char *buf),
785 ssize_t (*store)(struct device *dev,
786 struct device_attribute *attr,
787 const char *buf, size_t count))
788 {
789 sysfs_attr_init(&dev_attr->attr);
790 dev_attr->attr.name = name;
791 dev_attr->attr.mode = mode;
792 dev_attr->show = show;
793 dev_attr->store = store;
794 }
795
796 static void pmbus_attr_init(struct sensor_device_attribute *a,
797 const char *name,
798 umode_t mode,
799 ssize_t (*show)(struct device *dev,
800 struct device_attribute *attr,
801 char *buf),
802 ssize_t (*store)(struct device *dev,
803 struct device_attribute *attr,
804 const char *buf, size_t count),
805 int idx)
806 {
807 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
808 a->index = idx;
809 }
810
811 static int pmbus_add_boolean(struct pmbus_data *data,
812 const char *name, const char *type, int seq,
813 struct pmbus_sensor *s1,
814 struct pmbus_sensor *s2,
815 u16 reg, u8 mask)
816 {
817 struct pmbus_boolean *boolean;
818 struct sensor_device_attribute *a;
819
820 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
821 if (!boolean)
822 return -ENOMEM;
823
824 a = &boolean->attribute;
825
826 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
827 name, seq, type);
828 boolean->s1 = s1;
829 boolean->s2 = s2;
830 pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL,
831 (reg << 8) | mask);
832
833 return pmbus_add_attribute(data, &a->dev_attr.attr);
834 }
835
836 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
837 const char *name, const char *type,
838 int seq, int page, int reg,
839 enum pmbus_sensor_classes class,
840 bool update, bool readonly)
841 {
842 struct pmbus_sensor *sensor;
843 struct device_attribute *a;
844
845 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
846 if (!sensor)
847 return NULL;
848 a = &sensor->attribute;
849
850 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
851 name, seq, type);
852 sensor->page = page;
853 sensor->reg = reg;
854 sensor->class = class;
855 sensor->update = update;
856 pmbus_dev_attr_init(a, sensor->name,
857 readonly ? S_IRUGO : S_IRUGO | S_IWUSR,
858 pmbus_show_sensor, pmbus_set_sensor);
859
860 if (pmbus_add_attribute(data, &a->attr))
861 return NULL;
862
863 sensor->next = data->sensors;
864 data->sensors = sensor;
865
866 return sensor;
867 }
868
869 static int pmbus_add_label(struct pmbus_data *data,
870 const char *name, int seq,
871 const char *lstring, int index)
872 {
873 struct pmbus_label *label;
874 struct device_attribute *a;
875
876 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
877 if (!label)
878 return -ENOMEM;
879
880 a = &label->attribute;
881
882 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
883 if (!index)
884 strncpy(label->label, lstring, sizeof(label->label) - 1);
885 else
886 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
887 index);
888
889 pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL);
890 return pmbus_add_attribute(data, &a->attr);
891 }
892
893 /*
894 * Search for attributes. Allocate sensors, booleans, and labels as needed.
895 */
896
897 /*
898 * The pmbus_limit_attr structure describes a single limit attribute
899 * and its associated alarm attribute.
900 */
901 struct pmbus_limit_attr {
902 u16 reg; /* Limit register */
903 bool update; /* True if register needs updates */
904 bool low; /* True if low limit; for limits with compare
905 functions only */
906 const char *attr; /* Attribute name */
907 const char *alarm; /* Alarm attribute name */
908 u32 sbit; /* Alarm attribute status bit */
909 };
910
911 /*
912 * The pmbus_sensor_attr structure describes one sensor attribute. This
913 * description includes a reference to the associated limit attributes.
914 */
915 struct pmbus_sensor_attr {
916 u8 reg; /* sensor register */
917 enum pmbus_sensor_classes class;/* sensor class */
918 const char *label; /* sensor label */
919 bool paged; /* true if paged sensor */
920 bool update; /* true if update needed */
921 bool compare; /* true if compare function needed */
922 u32 func; /* sensor mask */
923 u32 sfunc; /* sensor status mask */
924 int sbase; /* status base register */
925 u32 gbit; /* generic status bit */
926 const struct pmbus_limit_attr *limit;/* limit registers */
927 int nlimit; /* # of limit registers */
928 };
929
930 /*
931 * Add a set of limit attributes and, if supported, the associated
932 * alarm attributes.
933 * returns 0 if no alarm register found, 1 if an alarm register was found,
934 * < 0 on errors.
935 */
936 static int pmbus_add_limit_attrs(struct i2c_client *client,
937 struct pmbus_data *data,
938 const struct pmbus_driver_info *info,
939 const char *name, int index, int page,
940 struct pmbus_sensor *base,
941 const struct pmbus_sensor_attr *attr)
942 {
943 const struct pmbus_limit_attr *l = attr->limit;
944 int nlimit = attr->nlimit;
945 int have_alarm = 0;
946 int i, ret;
947 struct pmbus_sensor *curr;
948
949 for (i = 0; i < nlimit; i++) {
950 if (pmbus_check_word_register(client, page, l->reg)) {
951 curr = pmbus_add_sensor(data, name, l->attr, index,
952 page, l->reg, attr->class,
953 attr->update || l->update,
954 false);
955 if (!curr)
956 return -ENOMEM;
957 if (l->sbit && (info->func[page] & attr->sfunc)) {
958 ret = pmbus_add_boolean(data, name,
959 l->alarm, index,
960 attr->compare ? l->low ? curr : base
961 : NULL,
962 attr->compare ? l->low ? base : curr
963 : NULL,
964 attr->sbase + page, l->sbit);
965 if (ret)
966 return ret;
967 have_alarm = 1;
968 }
969 }
970 l++;
971 }
972 return have_alarm;
973 }
974
975 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
976 struct pmbus_data *data,
977 const struct pmbus_driver_info *info,
978 const char *name,
979 int index, int page,
980 const struct pmbus_sensor_attr *attr)
981 {
982 struct pmbus_sensor *base;
983 int ret;
984
985 if (attr->label) {
986 ret = pmbus_add_label(data, name, index, attr->label,
987 attr->paged ? page + 1 : 0);
988 if (ret)
989 return ret;
990 }
991 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
992 attr->class, true, true);
993 if (!base)
994 return -ENOMEM;
995 if (attr->sfunc) {
996 ret = pmbus_add_limit_attrs(client, data, info, name,
997 index, page, base, attr);
998 if (ret < 0)
999 return ret;
1000 /*
1001 * Add generic alarm attribute only if there are no individual
1002 * alarm attributes, if there is a global alarm bit, and if
1003 * the generic status register for this page is accessible.
1004 */
1005 if (!ret && attr->gbit &&
1006 pmbus_check_byte_register(client, page,
1007 PMBUS_STATUS_BYTE)) {
1008 ret = pmbus_add_boolean(data, name, "alarm", index,
1009 NULL, NULL,
1010 PB_STATUS_BASE + page,
1011 attr->gbit);
1012 if (ret)
1013 return ret;
1014 }
1015 }
1016 return 0;
1017 }
1018
1019 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1020 struct pmbus_data *data,
1021 const char *name,
1022 const struct pmbus_sensor_attr *attrs,
1023 int nattrs)
1024 {
1025 const struct pmbus_driver_info *info = data->info;
1026 int index, i;
1027 int ret;
1028
1029 index = 1;
1030 for (i = 0; i < nattrs; i++) {
1031 int page, pages;
1032
1033 pages = attrs->paged ? info->pages : 1;
1034 for (page = 0; page < pages; page++) {
1035 if (!(info->func[page] & attrs->func))
1036 continue;
1037 ret = pmbus_add_sensor_attrs_one(client, data, info,
1038 name, index, page,
1039 attrs);
1040 if (ret)
1041 return ret;
1042 index++;
1043 }
1044 attrs++;
1045 }
1046 return 0;
1047 }
1048
1049 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1050 {
1051 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1052 .attr = "min",
1053 .alarm = "min_alarm",
1054 .sbit = PB_VOLTAGE_UV_WARNING,
1055 }, {
1056 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1057 .attr = "lcrit",
1058 .alarm = "lcrit_alarm",
1059 .sbit = PB_VOLTAGE_UV_FAULT,
1060 }, {
1061 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1062 .attr = "max",
1063 .alarm = "max_alarm",
1064 .sbit = PB_VOLTAGE_OV_WARNING,
1065 }, {
1066 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1067 .attr = "crit",
1068 .alarm = "crit_alarm",
1069 .sbit = PB_VOLTAGE_OV_FAULT,
1070 }, {
1071 .reg = PMBUS_VIRT_READ_VIN_AVG,
1072 .update = true,
1073 .attr = "average",
1074 }, {
1075 .reg = PMBUS_VIRT_READ_VIN_MIN,
1076 .update = true,
1077 .attr = "lowest",
1078 }, {
1079 .reg = PMBUS_VIRT_READ_VIN_MAX,
1080 .update = true,
1081 .attr = "highest",
1082 }, {
1083 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1084 .attr = "reset_history",
1085 },
1086 };
1087
1088 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1089 {
1090 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1091 .attr = "min",
1092 .alarm = "min_alarm",
1093 .sbit = PB_VOLTAGE_UV_WARNING,
1094 }, {
1095 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1096 .attr = "lcrit",
1097 .alarm = "lcrit_alarm",
1098 .sbit = PB_VOLTAGE_UV_FAULT,
1099 }, {
1100 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1101 .attr = "max",
1102 .alarm = "max_alarm",
1103 .sbit = PB_VOLTAGE_OV_WARNING,
1104 }, {
1105 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1106 .attr = "crit",
1107 .alarm = "crit_alarm",
1108 .sbit = PB_VOLTAGE_OV_FAULT,
1109 }, {
1110 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1111 .update = true,
1112 .attr = "average",
1113 }, {
1114 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1115 .update = true,
1116 .attr = "lowest",
1117 }, {
1118 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1119 .update = true,
1120 .attr = "highest",
1121 }, {
1122 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1123 .attr = "reset_history",
1124 }
1125 };
1126
1127 static const struct pmbus_sensor_attr voltage_attributes[] = {
1128 {
1129 .reg = PMBUS_READ_VIN,
1130 .class = PSC_VOLTAGE_IN,
1131 .label = "vin",
1132 .func = PMBUS_HAVE_VIN,
1133 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1134 .sbase = PB_STATUS_INPUT_BASE,
1135 .gbit = PB_STATUS_VIN_UV,
1136 .limit = vin_limit_attrs,
1137 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1138 }, {
1139 .reg = PMBUS_READ_VCAP,
1140 .class = PSC_VOLTAGE_IN,
1141 .label = "vcap",
1142 .func = PMBUS_HAVE_VCAP,
1143 }, {
1144 .reg = PMBUS_READ_VOUT,
1145 .class = PSC_VOLTAGE_OUT,
1146 .label = "vout",
1147 .paged = true,
1148 .func = PMBUS_HAVE_VOUT,
1149 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1150 .sbase = PB_STATUS_VOUT_BASE,
1151 .gbit = PB_STATUS_VOUT_OV,
1152 .limit = vout_limit_attrs,
1153 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1154 }
1155 };
1156
1157 /* Current attributes */
1158
1159 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1160 {
1161 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1162 .attr = "max",
1163 .alarm = "max_alarm",
1164 .sbit = PB_IIN_OC_WARNING,
1165 }, {
1166 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1167 .attr = "crit",
1168 .alarm = "crit_alarm",
1169 .sbit = PB_IIN_OC_FAULT,
1170 }, {
1171 .reg = PMBUS_VIRT_READ_IIN_AVG,
1172 .update = true,
1173 .attr = "average",
1174 }, {
1175 .reg = PMBUS_VIRT_READ_IIN_MIN,
1176 .update = true,
1177 .attr = "lowest",
1178 }, {
1179 .reg = PMBUS_VIRT_READ_IIN_MAX,
1180 .update = true,
1181 .attr = "highest",
1182 }, {
1183 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1184 .attr = "reset_history",
1185 }
1186 };
1187
1188 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1189 {
1190 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1191 .attr = "max",
1192 .alarm = "max_alarm",
1193 .sbit = PB_IOUT_OC_WARNING,
1194 }, {
1195 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1196 .attr = "lcrit",
1197 .alarm = "lcrit_alarm",
1198 .sbit = PB_IOUT_UC_FAULT,
1199 }, {
1200 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1201 .attr = "crit",
1202 .alarm = "crit_alarm",
1203 .sbit = PB_IOUT_OC_FAULT,
1204 }, {
1205 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1206 .update = true,
1207 .attr = "average",
1208 }, {
1209 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1210 .update = true,
1211 .attr = "lowest",
1212 }, {
1213 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1214 .update = true,
1215 .attr = "highest",
1216 }, {
1217 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1218 .attr = "reset_history",
1219 }
1220 };
1221
1222 static const struct pmbus_sensor_attr current_attributes[] = {
1223 {
1224 .reg = PMBUS_READ_IIN,
1225 .class = PSC_CURRENT_IN,
1226 .label = "iin",
1227 .func = PMBUS_HAVE_IIN,
1228 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1229 .sbase = PB_STATUS_INPUT_BASE,
1230 .limit = iin_limit_attrs,
1231 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1232 }, {
1233 .reg = PMBUS_READ_IOUT,
1234 .class = PSC_CURRENT_OUT,
1235 .label = "iout",
1236 .paged = true,
1237 .func = PMBUS_HAVE_IOUT,
1238 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1239 .sbase = PB_STATUS_IOUT_BASE,
1240 .gbit = PB_STATUS_IOUT_OC,
1241 .limit = iout_limit_attrs,
1242 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1243 }
1244 };
1245
1246 /* Power attributes */
1247
1248 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1249 {
1250 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1251 .attr = "max",
1252 .alarm = "alarm",
1253 .sbit = PB_PIN_OP_WARNING,
1254 }, {
1255 .reg = PMBUS_VIRT_READ_PIN_AVG,
1256 .update = true,
1257 .attr = "average",
1258 }, {
1259 .reg = PMBUS_VIRT_READ_PIN_MAX,
1260 .update = true,
1261 .attr = "input_highest",
1262 }, {
1263 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1264 .attr = "reset_history",
1265 }
1266 };
1267
1268 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1269 {
1270 .reg = PMBUS_POUT_MAX,
1271 .attr = "cap",
1272 .alarm = "cap_alarm",
1273 .sbit = PB_POWER_LIMITING,
1274 }, {
1275 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1276 .attr = "max",
1277 .alarm = "max_alarm",
1278 .sbit = PB_POUT_OP_WARNING,
1279 }, {
1280 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1281 .attr = "crit",
1282 .alarm = "crit_alarm",
1283 .sbit = PB_POUT_OP_FAULT,
1284 }, {
1285 .reg = PMBUS_VIRT_READ_POUT_AVG,
1286 .update = true,
1287 .attr = "average",
1288 }, {
1289 .reg = PMBUS_VIRT_READ_POUT_MAX,
1290 .update = true,
1291 .attr = "input_highest",
1292 }, {
1293 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1294 .attr = "reset_history",
1295 }
1296 };
1297
1298 static const struct pmbus_sensor_attr power_attributes[] = {
1299 {
1300 .reg = PMBUS_READ_PIN,
1301 .class = PSC_POWER,
1302 .label = "pin",
1303 .func = PMBUS_HAVE_PIN,
1304 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1305 .sbase = PB_STATUS_INPUT_BASE,
1306 .limit = pin_limit_attrs,
1307 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1308 }, {
1309 .reg = PMBUS_READ_POUT,
1310 .class = PSC_POWER,
1311 .label = "pout",
1312 .paged = true,
1313 .func = PMBUS_HAVE_POUT,
1314 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1315 .sbase = PB_STATUS_IOUT_BASE,
1316 .limit = pout_limit_attrs,
1317 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1318 }
1319 };
1320
1321 /* Temperature atributes */
1322
1323 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1324 {
1325 .reg = PMBUS_UT_WARN_LIMIT,
1326 .low = true,
1327 .attr = "min",
1328 .alarm = "min_alarm",
1329 .sbit = PB_TEMP_UT_WARNING,
1330 }, {
1331 .reg = PMBUS_UT_FAULT_LIMIT,
1332 .low = true,
1333 .attr = "lcrit",
1334 .alarm = "lcrit_alarm",
1335 .sbit = PB_TEMP_UT_FAULT,
1336 }, {
1337 .reg = PMBUS_OT_WARN_LIMIT,
1338 .attr = "max",
1339 .alarm = "max_alarm",
1340 .sbit = PB_TEMP_OT_WARNING,
1341 }, {
1342 .reg = PMBUS_OT_FAULT_LIMIT,
1343 .attr = "crit",
1344 .alarm = "crit_alarm",
1345 .sbit = PB_TEMP_OT_FAULT,
1346 }, {
1347 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1348 .attr = "lowest",
1349 }, {
1350 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1351 .attr = "average",
1352 }, {
1353 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1354 .attr = "highest",
1355 }, {
1356 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1357 .attr = "reset_history",
1358 }
1359 };
1360
1361 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1362 {
1363 .reg = PMBUS_UT_WARN_LIMIT,
1364 .low = true,
1365 .attr = "min",
1366 .alarm = "min_alarm",
1367 .sbit = PB_TEMP_UT_WARNING,
1368 }, {
1369 .reg = PMBUS_UT_FAULT_LIMIT,
1370 .low = true,
1371 .attr = "lcrit",
1372 .alarm = "lcrit_alarm",
1373 .sbit = PB_TEMP_UT_FAULT,
1374 }, {
1375 .reg = PMBUS_OT_WARN_LIMIT,
1376 .attr = "max",
1377 .alarm = "max_alarm",
1378 .sbit = PB_TEMP_OT_WARNING,
1379 }, {
1380 .reg = PMBUS_OT_FAULT_LIMIT,
1381 .attr = "crit",
1382 .alarm = "crit_alarm",
1383 .sbit = PB_TEMP_OT_FAULT,
1384 }, {
1385 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1386 .attr = "lowest",
1387 }, {
1388 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1389 .attr = "average",
1390 }, {
1391 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1392 .attr = "highest",
1393 }, {
1394 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1395 .attr = "reset_history",
1396 }
1397 };
1398
1399 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1400 {
1401 .reg = PMBUS_UT_WARN_LIMIT,
1402 .low = true,
1403 .attr = "min",
1404 .alarm = "min_alarm",
1405 .sbit = PB_TEMP_UT_WARNING,
1406 }, {
1407 .reg = PMBUS_UT_FAULT_LIMIT,
1408 .low = true,
1409 .attr = "lcrit",
1410 .alarm = "lcrit_alarm",
1411 .sbit = PB_TEMP_UT_FAULT,
1412 }, {
1413 .reg = PMBUS_OT_WARN_LIMIT,
1414 .attr = "max",
1415 .alarm = "max_alarm",
1416 .sbit = PB_TEMP_OT_WARNING,
1417 }, {
1418 .reg = PMBUS_OT_FAULT_LIMIT,
1419 .attr = "crit",
1420 .alarm = "crit_alarm",
1421 .sbit = PB_TEMP_OT_FAULT,
1422 }
1423 };
1424
1425 static const struct pmbus_sensor_attr temp_attributes[] = {
1426 {
1427 .reg = PMBUS_READ_TEMPERATURE_1,
1428 .class = PSC_TEMPERATURE,
1429 .paged = true,
1430 .update = true,
1431 .compare = true,
1432 .func = PMBUS_HAVE_TEMP,
1433 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1434 .sbase = PB_STATUS_TEMP_BASE,
1435 .gbit = PB_STATUS_TEMPERATURE,
1436 .limit = temp_limit_attrs,
1437 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1438 }, {
1439 .reg = PMBUS_READ_TEMPERATURE_2,
1440 .class = PSC_TEMPERATURE,
1441 .paged = true,
1442 .update = true,
1443 .compare = true,
1444 .func = PMBUS_HAVE_TEMP2,
1445 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1446 .sbase = PB_STATUS_TEMP_BASE,
1447 .gbit = PB_STATUS_TEMPERATURE,
1448 .limit = temp_limit_attrs2,
1449 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1450 }, {
1451 .reg = PMBUS_READ_TEMPERATURE_3,
1452 .class = PSC_TEMPERATURE,
1453 .paged = true,
1454 .update = true,
1455 .compare = true,
1456 .func = PMBUS_HAVE_TEMP3,
1457 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1458 .sbase = PB_STATUS_TEMP_BASE,
1459 .gbit = PB_STATUS_TEMPERATURE,
1460 .limit = temp_limit_attrs3,
1461 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1462 }
1463 };
1464
1465 static const int pmbus_fan_registers[] = {
1466 PMBUS_READ_FAN_SPEED_1,
1467 PMBUS_READ_FAN_SPEED_2,
1468 PMBUS_READ_FAN_SPEED_3,
1469 PMBUS_READ_FAN_SPEED_4
1470 };
1471
1472 static const int pmbus_fan_config_registers[] = {
1473 PMBUS_FAN_CONFIG_12,
1474 PMBUS_FAN_CONFIG_12,
1475 PMBUS_FAN_CONFIG_34,
1476 PMBUS_FAN_CONFIG_34
1477 };
1478
1479 static const int pmbus_fan_status_registers[] = {
1480 PMBUS_STATUS_FAN_12,
1481 PMBUS_STATUS_FAN_12,
1482 PMBUS_STATUS_FAN_34,
1483 PMBUS_STATUS_FAN_34
1484 };
1485
1486 static const u32 pmbus_fan_flags[] = {
1487 PMBUS_HAVE_FAN12,
1488 PMBUS_HAVE_FAN12,
1489 PMBUS_HAVE_FAN34,
1490 PMBUS_HAVE_FAN34
1491 };
1492
1493 static const u32 pmbus_fan_status_flags[] = {
1494 PMBUS_HAVE_STATUS_FAN12,
1495 PMBUS_HAVE_STATUS_FAN12,
1496 PMBUS_HAVE_STATUS_FAN34,
1497 PMBUS_HAVE_STATUS_FAN34
1498 };
1499
1500 /* Fans */
1501 static int pmbus_add_fan_attributes(struct i2c_client *client,
1502 struct pmbus_data *data)
1503 {
1504 const struct pmbus_driver_info *info = data->info;
1505 int index = 1;
1506 int page;
1507 int ret;
1508
1509 for (page = 0; page < info->pages; page++) {
1510 int f;
1511
1512 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1513 int regval;
1514
1515 if (!(info->func[page] & pmbus_fan_flags[f]))
1516 break;
1517
1518 if (!pmbus_check_word_register(client, page,
1519 pmbus_fan_registers[f]))
1520 break;
1521
1522 /*
1523 * Skip fan if not installed.
1524 * Each fan configuration register covers multiple fans,
1525 * so we have to do some magic.
1526 */
1527 regval = _pmbus_read_byte_data(client, page,
1528 pmbus_fan_config_registers[f]);
1529 if (regval < 0 ||
1530 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1531 continue;
1532
1533 if (pmbus_add_sensor(data, "fan", "input", index,
1534 page, pmbus_fan_registers[f],
1535 PSC_FAN, true, true) == NULL)
1536 return -ENOMEM;
1537
1538 /*
1539 * Each fan status register covers multiple fans,
1540 * so we have to do some magic.
1541 */
1542 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1543 pmbus_check_byte_register(client,
1544 page, pmbus_fan_status_registers[f])) {
1545 int base;
1546
1547 if (f > 1) /* fan 3, 4 */
1548 base = PB_STATUS_FAN34_BASE + page;
1549 else
1550 base = PB_STATUS_FAN_BASE + page;
1551 ret = pmbus_add_boolean(data, "fan",
1552 "alarm", index, NULL, NULL, base,
1553 PB_FAN_FAN1_WARNING >> (f & 1));
1554 if (ret)
1555 return ret;
1556 ret = pmbus_add_boolean(data, "fan",
1557 "fault", index, NULL, NULL, base,
1558 PB_FAN_FAN1_FAULT >> (f & 1));
1559 if (ret)
1560 return ret;
1561 }
1562 index++;
1563 }
1564 }
1565 return 0;
1566 }
1567
1568 static int pmbus_find_attributes(struct i2c_client *client,
1569 struct pmbus_data *data)
1570 {
1571 int ret;
1572
1573 /* Voltage sensors */
1574 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1575 ARRAY_SIZE(voltage_attributes));
1576 if (ret)
1577 return ret;
1578
1579 /* Current sensors */
1580 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1581 ARRAY_SIZE(current_attributes));
1582 if (ret)
1583 return ret;
1584
1585 /* Power sensors */
1586 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1587 ARRAY_SIZE(power_attributes));
1588 if (ret)
1589 return ret;
1590
1591 /* Temperature sensors */
1592 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1593 ARRAY_SIZE(temp_attributes));
1594 if (ret)
1595 return ret;
1596
1597 /* Fans */
1598 ret = pmbus_add_fan_attributes(client, data);
1599 return ret;
1600 }
1601
1602 /*
1603 * Identify chip parameters.
1604 * This function is called for all chips.
1605 */
1606 static int pmbus_identify_common(struct i2c_client *client,
1607 struct pmbus_data *data)
1608 {
1609 int vout_mode = -1;
1610
1611 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1612 vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1613 if (vout_mode >= 0 && vout_mode != 0xff) {
1614 /*
1615 * Not all chips support the VOUT_MODE command,
1616 * so a failure to read it is not an error.
1617 */
1618 switch (vout_mode >> 5) {
1619 case 0: /* linear mode */
1620 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1621 return -ENODEV;
1622
1623 data->exponent = ((s8)(vout_mode << 3)) >> 3;
1624 break;
1625 case 1: /* VID mode */
1626 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1627 return -ENODEV;
1628 break;
1629 case 2: /* direct mode */
1630 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1631 return -ENODEV;
1632 break;
1633 default:
1634 return -ENODEV;
1635 }
1636 }
1637
1638 pmbus_clear_fault_page(client, 0);
1639 return 0;
1640 }
1641
1642 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1643 struct pmbus_driver_info *info)
1644 {
1645 struct device *dev = &client->dev;
1646 const struct pmbus_platform_data *pdata = dev->platform_data;
1647 struct pmbus_data *data;
1648 int ret;
1649
1650 if (!info)
1651 return -ENODEV;
1652
1653 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1654 | I2C_FUNC_SMBUS_BYTE_DATA
1655 | I2C_FUNC_SMBUS_WORD_DATA))
1656 return -ENODEV;
1657
1658 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1659 if (!data)
1660 return -ENOMEM;
1661
1662 i2c_set_clientdata(client, data);
1663 mutex_init(&data->update_lock);
1664 data->dev = dev;
1665
1666 /* Bail out if PMBus status register does not exist. */
1667 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
1668 dev_err(dev, "PMBus status register not found\n");
1669 return -ENODEV;
1670 }
1671
1672 if (pdata)
1673 data->flags = pdata->flags;
1674 data->info = info;
1675
1676 pmbus_clear_faults(client);
1677
1678 if (info->identify) {
1679 ret = (*info->identify)(client, info);
1680 if (ret < 0) {
1681 dev_err(dev, "Chip identification failed\n");
1682 return ret;
1683 }
1684 }
1685
1686 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1687 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
1688 return -ENODEV;
1689 }
1690
1691 ret = pmbus_identify_common(client, data);
1692 if (ret < 0) {
1693 dev_err(dev, "Failed to identify chip capabilities\n");
1694 return ret;
1695 }
1696
1697 ret = pmbus_find_attributes(client, data);
1698 if (ret)
1699 goto out_kfree;
1700
1701 /*
1702 * If there are no attributes, something is wrong.
1703 * Bail out instead of trying to register nothing.
1704 */
1705 if (!data->num_attributes) {
1706 dev_err(dev, "No attributes found\n");
1707 ret = -ENODEV;
1708 goto out_kfree;
1709 }
1710
1711 /* Register sysfs hooks */
1712 ret = sysfs_create_group(&dev->kobj, &data->group);
1713 if (ret) {
1714 dev_err(dev, "Failed to create sysfs entries\n");
1715 goto out_kfree;
1716 }
1717 data->hwmon_dev = hwmon_device_register(dev);
1718 if (IS_ERR(data->hwmon_dev)) {
1719 ret = PTR_ERR(data->hwmon_dev);
1720 dev_err(dev, "Failed to register hwmon device\n");
1721 goto out_hwmon_device_register;
1722 }
1723 return 0;
1724
1725 out_hwmon_device_register:
1726 sysfs_remove_group(&dev->kobj, &data->group);
1727 out_kfree:
1728 kfree(data->group.attrs);
1729 return ret;
1730 }
1731 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1732
1733 int pmbus_do_remove(struct i2c_client *client)
1734 {
1735 struct pmbus_data *data = i2c_get_clientdata(client);
1736 hwmon_device_unregister(data->hwmon_dev);
1737 sysfs_remove_group(&client->dev.kobj, &data->group);
1738 kfree(data->group.attrs);
1739 return 0;
1740 }
1741 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1742
1743 MODULE_AUTHOR("Guenter Roeck");
1744 MODULE_DESCRIPTION("PMBus core driver");
1745 MODULE_LICENSE("GPL");
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