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serial: pxa: fine-tune clk useage
[linux/fpc-iii.git] / drivers / hwmon / pmbus / pmbus_core.c
blob7d19b1bb9ce6acf7de556c93fefb685501a195e1
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 * Constants needed to determine number of sensors, booleans, and labels.
35 */
36 #define PMBUS_MAX_INPUT_SENSORS 22 /* 10*volt, 7*curr, 5*power */
37 #define PMBUS_VOUT_SENSORS_PER_PAGE 9 /* input, min, max, lcrit,
38 crit, lowest, highest, avg,
39 reset */
40 #define PMBUS_IOUT_SENSORS_PER_PAGE 8 /* input, min, max, crit,
41 lowest, highest, avg,
42 reset */
43 #define PMBUS_POUT_SENSORS_PER_PAGE 7 /* input, cap, max, crit,
44 * highest, avg, reset
45 */
46 #define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
47 #define PMBUS_MAX_SENSORS_PER_TEMP 9 /* input, min, max, lcrit,
48 * crit, lowest, highest, avg,
49 * reset
50 */
51
52 #define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
53 lcrit_alarm, crit_alarm;
54 c: alarm, crit_alarm;
55 p: crit_alarm */
56 #define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
57 lcrit_alarm, crit_alarm */
58 #define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
59 crit_alarm */
60 #define PMBUS_POUT_BOOLEANS_PER_PAGE 3 /* cap_alarm, alarm, crit_alarm
61 */
62 #define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
63 #define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
64 lcrit_alarm, crit_alarm */
65
66 #define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
67
68 /*
69 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
70 * are paged. status_input is unpaged.
71 */
72 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
73
74 /*
75 * Index into status register array, per status register group
76 */
77 #define PB_STATUS_BASE 0
78 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
79 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
80 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
81 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
82 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
83 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
84
85 #define PMBUS_NAME_SIZE 24
86
87 struct pmbus_sensor {
88 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
89 struct sensor_device_attribute attribute;
90 u8 page; /* page number */
91 u16 reg; /* register */
92 enum pmbus_sensor_classes class; /* sensor class */
93 bool update; /* runtime sensor update needed */
94 int data; /* Sensor data.
95 Negative if there was a read error */
96 };
97
98 struct pmbus_boolean {
99 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
100 struct sensor_device_attribute attribute;
101 };
102
103 struct pmbus_label {
104 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
105 struct sensor_device_attribute attribute;
106 char label[PMBUS_NAME_SIZE]; /* label */
107 };
108
109 struct pmbus_data {
110 struct device *hwmon_dev;
111
112 u32 flags; /* from platform data */
113
114 int exponent; /* linear mode: exponent for output voltages */
115
116 const struct pmbus_driver_info *info;
117
118 int max_attributes;
119 int num_attributes;
120 struct attribute **attributes;
121 struct attribute_group group;
122
123 /*
124 * Sensors cover both sensor and limit registers.
125 */
126 int max_sensors;
127 int num_sensors;
128 struct pmbus_sensor *sensors;
129 /*
130 * Booleans are used for alarms.
131 * Values are determined from status registers.
132 */
133 int max_booleans;
134 int num_booleans;
135 struct pmbus_boolean *booleans;
136 /*
137 * Labels are used to map generic names (e.g., "in1")
138 * to PMBus specific names (e.g., "vin" or "vout1").
139 */
140 int max_labels;
141 int num_labels;
142 struct pmbus_label *labels;
143
144 struct mutex update_lock;
145 bool valid;
146 unsigned long last_updated; /* in jiffies */
147
148 /*
149 * A single status register covers multiple attributes,
150 * so we keep them all together.
151 */
152 u8 status[PB_NUM_STATUS_REG];
153
154 u8 currpage;
155 };
156
157 int pmbus_set_page(struct i2c_client *client, u8 page)
158 {
159 struct pmbus_data *data = i2c_get_clientdata(client);
160 int rv = 0;
161 int newpage;
162
163 if (page != data->currpage) {
164 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
165 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
166 if (newpage != page)
167 rv = -EIO;
168 else
169 data->currpage = page;
170 }
171 return rv;
172 }
173 EXPORT_SYMBOL_GPL(pmbus_set_page);
174
175 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
176 {
177 int rv;
178
179 if (page >= 0) {
180 rv = pmbus_set_page(client, page);
181 if (rv < 0)
182 return rv;
183 }
184
185 return i2c_smbus_write_byte(client, value);
186 }
187 EXPORT_SYMBOL_GPL(pmbus_write_byte);
188
189 /*
190 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
191 * a device specific mapping funcion exists and calls it if necessary.
192 */
193 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
194 {
195 struct pmbus_data *data = i2c_get_clientdata(client);
196 const struct pmbus_driver_info *info = data->info;
197 int status;
198
199 if (info->write_byte) {
200 status = info->write_byte(client, page, value);
201 if (status != -ENODATA)
202 return status;
203 }
204 return pmbus_write_byte(client, page, value);
205 }
206
207 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
208 {
209 int rv;
210
211 rv = pmbus_set_page(client, page);
212 if (rv < 0)
213 return rv;
214
215 return i2c_smbus_write_word_data(client, reg, word);
216 }
217 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
218
219 /*
220 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
221 * a device specific mapping function exists and calls it if necessary.
222 */
223 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
224 u16 word)
225 {
226 struct pmbus_data *data = i2c_get_clientdata(client);
227 const struct pmbus_driver_info *info = data->info;
228 int status;
229
230 if (info->write_word_data) {
231 status = info->write_word_data(client, page, reg, word);
232 if (status != -ENODATA)
233 return status;
234 }
235 if (reg >= PMBUS_VIRT_BASE)
236 return -ENXIO;
237 return pmbus_write_word_data(client, page, reg, word);
238 }
239
240 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
241 {
242 int rv;
243
244 rv = pmbus_set_page(client, page);
245 if (rv < 0)
246 return rv;
247
248 return i2c_smbus_read_word_data(client, reg);
249 }
250 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
251
252 /*
253 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
254 * a device specific mapping function exists and calls it if necessary.
255 */
256 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
257 {
258 struct pmbus_data *data = i2c_get_clientdata(client);
259 const struct pmbus_driver_info *info = data->info;
260 int status;
261
262 if (info->read_word_data) {
263 status = info->read_word_data(client, page, reg);
264 if (status != -ENODATA)
265 return status;
266 }
267 if (reg >= PMBUS_VIRT_BASE)
268 return -ENXIO;
269 return pmbus_read_word_data(client, page, reg);
270 }
271
272 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
273 {
274 int rv;
275
276 if (page >= 0) {
277 rv = pmbus_set_page(client, page);
278 if (rv < 0)
279 return rv;
280 }
281
282 return i2c_smbus_read_byte_data(client, reg);
283 }
284 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
285
286 /*
287 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
288 * a device specific mapping function exists and calls it if necessary.
289 */
290 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
291 {
292 struct pmbus_data *data = i2c_get_clientdata(client);
293 const struct pmbus_driver_info *info = data->info;
294 int status;
295
296 if (info->read_byte_data) {
297 status = info->read_byte_data(client, page, reg);
298 if (status != -ENODATA)
299 return status;
300 }
301 return pmbus_read_byte_data(client, page, reg);
302 }
303
304 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
305 {
306 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
307 }
308
309 void pmbus_clear_faults(struct i2c_client *client)
310 {
311 struct pmbus_data *data = i2c_get_clientdata(client);
312 int i;
313
314 for (i = 0; i < data->info->pages; i++)
315 pmbus_clear_fault_page(client, i);
316 }
317 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
318
319 static int pmbus_check_status_cml(struct i2c_client *client)
320 {
321 int status, status2;
322
323 status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE);
324 if (status < 0 || (status & PB_STATUS_CML)) {
325 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
326 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
327 return -EIO;
328 }
329 return 0;
330 }
331
332 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
333 {
334 int rv;
335 struct pmbus_data *data = i2c_get_clientdata(client);
336
337 rv = _pmbus_read_byte_data(client, page, reg);
338 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
339 rv = pmbus_check_status_cml(client);
340 pmbus_clear_fault_page(client, -1);
341 return rv >= 0;
342 }
343 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
344
345 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
346 {
347 int rv;
348 struct pmbus_data *data = i2c_get_clientdata(client);
349
350 rv = _pmbus_read_word_data(client, page, reg);
351 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
352 rv = pmbus_check_status_cml(client);
353 pmbus_clear_fault_page(client, -1);
354 return rv >= 0;
355 }
356 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
357
358 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
359 {
360 struct pmbus_data *data = i2c_get_clientdata(client);
361
362 return data->info;
363 }
364 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
365
366 static struct pmbus_data *pmbus_update_device(struct device *dev)
367 {
368 struct i2c_client *client = to_i2c_client(dev);
369 struct pmbus_data *data = i2c_get_clientdata(client);
370 const struct pmbus_driver_info *info = data->info;
371
372 mutex_lock(&data->update_lock);
373 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
374 int i;
375
376 for (i = 0; i < info->pages; i++)
377 data->status[PB_STATUS_BASE + i]
378 = _pmbus_read_byte_data(client, i,
379 PMBUS_STATUS_BYTE);
380 for (i = 0; i < info->pages; i++) {
381 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
382 continue;
383 data->status[PB_STATUS_VOUT_BASE + i]
384 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT);
385 }
386 for (i = 0; i < info->pages; i++) {
387 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
388 continue;
389 data->status[PB_STATUS_IOUT_BASE + i]
390 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT);
391 }
392 for (i = 0; i < info->pages; i++) {
393 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
394 continue;
395 data->status[PB_STATUS_TEMP_BASE + i]
396 = _pmbus_read_byte_data(client, i,
397 PMBUS_STATUS_TEMPERATURE);
398 }
399 for (i = 0; i < info->pages; i++) {
400 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
401 continue;
402 data->status[PB_STATUS_FAN_BASE + i]
403 = _pmbus_read_byte_data(client, i,
404 PMBUS_STATUS_FAN_12);
405 }
406
407 for (i = 0; i < info->pages; i++) {
408 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
409 continue;
410 data->status[PB_STATUS_FAN34_BASE + i]
411 = _pmbus_read_byte_data(client, i,
412 PMBUS_STATUS_FAN_34);
413 }
414
415 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
416 data->status[PB_STATUS_INPUT_BASE]
417 = _pmbus_read_byte_data(client, 0,
418 PMBUS_STATUS_INPUT);
419
420 for (i = 0; i < data->num_sensors; i++) {
421 struct pmbus_sensor *sensor = &data->sensors[i];
422
423 if (!data->valid || sensor->update)
424 sensor->data
425 = _pmbus_read_word_data(client,
426 sensor->page,
427 sensor->reg);
428 }
429 pmbus_clear_faults(client);
430 data->last_updated = jiffies;
431 data->valid = 1;
432 }
433 mutex_unlock(&data->update_lock);
434 return data;
435 }
436
437 /*
438 * Convert linear sensor values to milli- or micro-units
439 * depending on sensor type.
440 */
441 static long pmbus_reg2data_linear(struct pmbus_data *data,
442 struct pmbus_sensor *sensor)
443 {
444 s16 exponent;
445 s32 mantissa;
446 long val;
447
448 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
449 exponent = data->exponent;
450 mantissa = (u16) sensor->data;
451 } else { /* LINEAR11 */
452 exponent = ((s16)sensor->data) >> 11;
453 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
454 }
455
456 val = mantissa;
457
458 /* scale result to milli-units for all sensors except fans */
459 if (sensor->class != PSC_FAN)
460 val = val * 1000L;
461
462 /* scale result to micro-units for power sensors */
463 if (sensor->class == PSC_POWER)
464 val = val * 1000L;
465
466 if (exponent >= 0)
467 val <<= exponent;
468 else
469 val >>= -exponent;
470
471 return val;
472 }
473
474 /*
475 * Convert direct sensor values to milli- or micro-units
476 * depending on sensor type.
477 */
478 static long pmbus_reg2data_direct(struct pmbus_data *data,
479 struct pmbus_sensor *sensor)
480 {
481 long val = (s16) sensor->data;
482 long m, b, R;
483
484 m = data->info->m[sensor->class];
485 b = data->info->b[sensor->class];
486 R = data->info->R[sensor->class];
487
488 if (m == 0)
489 return 0;
490
491 /* X = 1/m * (Y * 10^-R - b) */
492 R = -R;
493 /* scale result to milli-units for everything but fans */
494 if (sensor->class != PSC_FAN) {
495 R += 3;
496 b *= 1000;
497 }
498
499 /* scale result to micro-units for power sensors */
500 if (sensor->class == PSC_POWER) {
501 R += 3;
502 b *= 1000;
503 }
504
505 while (R > 0) {
506 val *= 10;
507 R--;
508 }
509 while (R < 0) {
510 val = DIV_ROUND_CLOSEST(val, 10);
511 R++;
512 }
513
514 return (val - b) / m;
515 }
516
517 /*
518 * Convert VID sensor values to milli- or micro-units
519 * depending on sensor type.
520 * We currently only support VR11.
521 */
522 static long pmbus_reg2data_vid(struct pmbus_data *data,
523 struct pmbus_sensor *sensor)
524 {
525 long val = sensor->data;
526
527 if (val < 0x02 || val > 0xb2)
528 return 0;
529 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
530 }
531
532 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
533 {
534 long val;
535
536 switch (data->info->format[sensor->class]) {
537 case direct:
538 val = pmbus_reg2data_direct(data, sensor);
539 break;
540 case vid:
541 val = pmbus_reg2data_vid(data, sensor);
542 break;
543 case linear:
544 default:
545 val = pmbus_reg2data_linear(data, sensor);
546 break;
547 }
548 return val;
549 }
550
551 #define MAX_MANTISSA (1023 * 1000)
552 #define MIN_MANTISSA (511 * 1000)
553
554 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
555 enum pmbus_sensor_classes class, long val)
556 {
557 s16 exponent = 0, mantissa;
558 bool negative = false;
559
560 /* simple case */
561 if (val == 0)
562 return 0;
563
564 if (class == PSC_VOLTAGE_OUT) {
565 /* LINEAR16 does not support negative voltages */
566 if (val < 0)
567 return 0;
568
569 /*
570 * For a static exponents, we don't have a choice
571 * but to adjust the value to it.
572 */
573 if (data->exponent < 0)
574 val <<= -data->exponent;
575 else
576 val >>= data->exponent;
577 val = DIV_ROUND_CLOSEST(val, 1000);
578 return val & 0xffff;
579 }
580
581 if (val < 0) {
582 negative = true;
583 val = -val;
584 }
585
586 /* Power is in uW. Convert to mW before converting. */
587 if (class == PSC_POWER)
588 val = DIV_ROUND_CLOSEST(val, 1000L);
589
590 /*
591 * For simplicity, convert fan data to milli-units
592 * before calculating the exponent.
593 */
594 if (class == PSC_FAN)
595 val = val * 1000;
596
597 /* Reduce large mantissa until it fits into 10 bit */
598 while (val >= MAX_MANTISSA && exponent < 15) {
599 exponent++;
600 val >>= 1;
601 }
602 /* Increase small mantissa to improve precision */
603 while (val < MIN_MANTISSA && exponent > -15) {
604 exponent--;
605 val <<= 1;
606 }
607
608 /* Convert mantissa from milli-units to units */
609 mantissa = DIV_ROUND_CLOSEST(val, 1000);
610
611 /* Ensure that resulting number is within range */
612 if (mantissa > 0x3ff)
613 mantissa = 0x3ff;
614
615 /* restore sign */
616 if (negative)
617 mantissa = -mantissa;
618
619 /* Convert to 5 bit exponent, 11 bit mantissa */
620 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
621 }
622
623 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
624 enum pmbus_sensor_classes class, long val)
625 {
626 long m, b, R;
627
628 m = data->info->m[class];
629 b = data->info->b[class];
630 R = data->info->R[class];
631
632 /* Power is in uW. Adjust R and b. */
633 if (class == PSC_POWER) {
634 R -= 3;
635 b *= 1000;
636 }
637
638 /* Calculate Y = (m * X + b) * 10^R */
639 if (class != PSC_FAN) {
640 R -= 3; /* Adjust R and b for data in milli-units */
641 b *= 1000;
642 }
643 val = val * m + b;
644
645 while (R > 0) {
646 val *= 10;
647 R--;
648 }
649 while (R < 0) {
650 val = DIV_ROUND_CLOSEST(val, 10);
651 R++;
652 }
653
654 return val;
655 }
656
657 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
658 enum pmbus_sensor_classes class, long val)
659 {
660 val = SENSORS_LIMIT(val, 500, 1600);
661
662 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
663 }
664
665 static u16 pmbus_data2reg(struct pmbus_data *data,
666 enum pmbus_sensor_classes class, long val)
667 {
668 u16 regval;
669
670 switch (data->info->format[class]) {
671 case direct:
672 regval = pmbus_data2reg_direct(data, class, val);
673 break;
674 case vid:
675 regval = pmbus_data2reg_vid(data, class, val);
676 break;
677 case linear:
678 default:
679 regval = pmbus_data2reg_linear(data, class, val);
680 break;
681 }
682 return regval;
683 }
684
685 /*
686 * Return boolean calculated from converted data.
687 * <index> defines a status register index and mask, and optionally
688 * two sensor indexes.
689 * The upper half-word references the two sensors,
690 * two sensor indices.
691 * The upper half-word references the two optional sensors,
692 * the lower half word references status register and mask.
693 * The function returns true if (status[reg] & mask) is true and,
694 * if specified, if v1 >= v2.
695 * To determine if an object exceeds upper limits, specify <v, limit>.
696 * To determine if an object exceeds lower limits, specify <limit, v>.
697 *
698 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
699 * index are set. s1 and s2 (the sensor index values) are zero in this case.
700 * The function returns true if (status[reg] & mask) is true.
701 *
702 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
703 * a specified limit has to be performed to determine the boolean result.
704 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
705 * sensor values referenced by sensor indices s1 and s2).
706 *
707 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
708 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
709 *
710 * If a negative value is stored in any of the referenced registers, this value
711 * reflects an error code which will be returned.
712 */
713 static int pmbus_get_boolean(struct pmbus_data *data, int index)
714 {
715 u8 s1 = (index >> 24) & 0xff;
716 u8 s2 = (index >> 16) & 0xff;
717 u8 reg = (index >> 8) & 0xff;
718 u8 mask = index & 0xff;
719 int ret, status;
720 u8 regval;
721
722 status = data->status[reg];
723 if (status < 0)
724 return status;
725
726 regval = status & mask;
727 if (!s1 && !s2)
728 ret = !!regval;
729 else {
730 long v1, v2;
731 struct pmbus_sensor *sensor1, *sensor2;
732
733 sensor1 = &data->sensors[s1];
734 if (sensor1->data < 0)
735 return sensor1->data;
736 sensor2 = &data->sensors[s2];
737 if (sensor2->data < 0)
738 return sensor2->data;
739
740 v1 = pmbus_reg2data(data, sensor1);
741 v2 = pmbus_reg2data(data, sensor2);
742 ret = !!(regval && v1 >= v2);
743 }
744 return ret;
745 }
746
747 static ssize_t pmbus_show_boolean(struct device *dev,
748 struct device_attribute *da, char *buf)
749 {
750 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
751 struct pmbus_data *data = pmbus_update_device(dev);
752 int val;
753
754 val = pmbus_get_boolean(data, attr->index);
755 if (val < 0)
756 return val;
757 return snprintf(buf, PAGE_SIZE, "%d\n", val);
758 }
759
760 static ssize_t pmbus_show_sensor(struct device *dev,
761 struct device_attribute *da, char *buf)
762 {
763 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
764 struct pmbus_data *data = pmbus_update_device(dev);
765 struct pmbus_sensor *sensor;
766
767 sensor = &data->sensors[attr->index];
768 if (sensor->data < 0)
769 return sensor->data;
770
771 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
772 }
773
774 static ssize_t pmbus_set_sensor(struct device *dev,
775 struct device_attribute *devattr,
776 const char *buf, size_t count)
777 {
778 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
779 struct i2c_client *client = to_i2c_client(dev);
780 struct pmbus_data *data = i2c_get_clientdata(client);
781 struct pmbus_sensor *sensor = &data->sensors[attr->index];
782 ssize_t rv = count;
783 long val = 0;
784 int ret;
785 u16 regval;
786
787 if (kstrtol(buf, 10, &val) < 0)
788 return -EINVAL;
789
790 mutex_lock(&data->update_lock);
791 regval = pmbus_data2reg(data, sensor->class, val);
792 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
793 if (ret < 0)
794 rv = ret;
795 else
796 data->sensors[attr->index].data = regval;
797 mutex_unlock(&data->update_lock);
798 return rv;
799 }
800
801 static ssize_t pmbus_show_label(struct device *dev,
802 struct device_attribute *da, char *buf)
803 {
804 struct i2c_client *client = to_i2c_client(dev);
805 struct pmbus_data *data = i2c_get_clientdata(client);
806 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
807
808 return snprintf(buf, PAGE_SIZE, "%s\n",
809 data->labels[attr->index].label);
810 }
811
812 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
813 do { \
814 struct sensor_device_attribute *a \
815 = &data->_type##s[data->num_##_type##s].attribute; \
816 BUG_ON(data->num_attributes >= data->max_attributes); \
817 sysfs_attr_init(&a->dev_attr.attr); \
818 a->dev_attr.attr.name = _name; \
819 a->dev_attr.attr.mode = _mode; \
820 a->dev_attr.show = _show; \
821 a->dev_attr.store = _set; \
822 a->index = _idx; \
823 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
824 data->num_attributes++; \
825 } while (0)
826
827 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
828 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
829 pmbus_show_##_type, NULL)
830
831 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
832 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
833 pmbus_show_##_type, pmbus_set_##_type)
834
835 static void pmbus_add_boolean(struct pmbus_data *data,
836 const char *name, const char *type, int seq,
837 int idx)
838 {
839 struct pmbus_boolean *boolean;
840
841 BUG_ON(data->num_booleans >= data->max_booleans);
842
843 boolean = &data->booleans[data->num_booleans];
844
845 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
846 name, seq, type);
847 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
848 data->num_booleans++;
849 }
850
851 static void pmbus_add_boolean_reg(struct pmbus_data *data,
852 const char *name, const char *type,
853 int seq, int reg, int bit)
854 {
855 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
856 }
857
858 static void pmbus_add_boolean_cmp(struct pmbus_data *data,
859 const char *name, const char *type,
860 int seq, int i1, int i2, int reg, int mask)
861 {
862 pmbus_add_boolean(data, name, type, seq,
863 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
864 }
865
866 static void pmbus_add_sensor(struct pmbus_data *data,
867 const char *name, const char *type, int seq,
868 int page, int reg, enum pmbus_sensor_classes class,
869 bool update, bool readonly)
870 {
871 struct pmbus_sensor *sensor;
872
873 BUG_ON(data->num_sensors >= data->max_sensors);
874
875 sensor = &data->sensors[data->num_sensors];
876 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
877 name, seq, type);
878 sensor->page = page;
879 sensor->reg = reg;
880 sensor->class = class;
881 sensor->update = update;
882 if (readonly)
883 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
884 data->num_sensors);
885 else
886 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
887 data->num_sensors);
888 data->num_sensors++;
889 }
890
891 static void pmbus_add_label(struct pmbus_data *data,
892 const char *name, int seq,
893 const char *lstring, int index)
894 {
895 struct pmbus_label *label;
896
897 BUG_ON(data->num_labels >= data->max_labels);
898
899 label = &data->labels[data->num_labels];
900 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
901 if (!index)
902 strncpy(label->label, lstring, sizeof(label->label) - 1);
903 else
904 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
905 index);
906
907 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
908 data->num_labels++;
909 }
910
911 /*
912 * Determine maximum number of sensors, booleans, and labels.
913 * To keep things simple, only make a rough high estimate.
914 */
915 static void pmbus_find_max_attr(struct i2c_client *client,
916 struct pmbus_data *data)
917 {
918 const struct pmbus_driver_info *info = data->info;
919 int page, max_sensors, max_booleans, max_labels;
920
921 max_sensors = PMBUS_MAX_INPUT_SENSORS;
922 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
923 max_labels = PMBUS_MAX_INPUT_LABELS;
924
925 for (page = 0; page < info->pages; page++) {
926 if (info->func[page] & PMBUS_HAVE_VOUT) {
927 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
928 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
929 max_labels++;
930 }
931 if (info->func[page] & PMBUS_HAVE_IOUT) {
932 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
933 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
934 max_labels++;
935 }
936 if (info->func[page] & PMBUS_HAVE_POUT) {
937 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
938 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
939 max_labels++;
940 }
941 if (info->func[page] & PMBUS_HAVE_FAN12) {
942 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
943 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
944 }
945 if (info->func[page] & PMBUS_HAVE_FAN34) {
946 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
947 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
948 }
949 if (info->func[page] & PMBUS_HAVE_TEMP) {
950 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
951 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
952 }
953 if (info->func[page] & PMBUS_HAVE_TEMP2) {
954 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
955 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
956 }
957 if (info->func[page] & PMBUS_HAVE_TEMP3) {
958 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
959 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
960 }
961 }
962 data->max_sensors = max_sensors;
963 data->max_booleans = max_booleans;
964 data->max_labels = max_labels;
965 data->max_attributes = max_sensors + max_booleans + max_labels;
966 }
967
968 /*
969 * Search for attributes. Allocate sensors, booleans, and labels as needed.
970 */
971
972 /*
973 * The pmbus_limit_attr structure describes a single limit attribute
974 * and its associated alarm attribute.
975 */
976 struct pmbus_limit_attr {
977 u16 reg; /* Limit register */
978 bool update; /* True if register needs updates */
979 bool low; /* True if low limit; for limits with compare
980 functions only */
981 const char *attr; /* Attribute name */
982 const char *alarm; /* Alarm attribute name */
983 u32 sbit; /* Alarm attribute status bit */
984 };
985
986 /*
987 * The pmbus_sensor_attr structure describes one sensor attribute. This
988 * description includes a reference to the associated limit attributes.
989 */
990 struct pmbus_sensor_attr {
991 u8 reg; /* sensor register */
992 enum pmbus_sensor_classes class;/* sensor class */
993 const char *label; /* sensor label */
994 bool paged; /* true if paged sensor */
995 bool update; /* true if update needed */
996 bool compare; /* true if compare function needed */
997 u32 func; /* sensor mask */
998 u32 sfunc; /* sensor status mask */
999 int sbase; /* status base register */
1000 u32 gbit; /* generic status bit */
1001 const struct pmbus_limit_attr *limit;/* limit registers */
1002 int nlimit; /* # of limit registers */
1003 };
1004
1005 /*
1006 * Add a set of limit attributes and, if supported, the associated
1007 * alarm attributes.
1008 */
1009 static bool pmbus_add_limit_attrs(struct i2c_client *client,
1010 struct pmbus_data *data,
1011 const struct pmbus_driver_info *info,
1012 const char *name, int index, int page,
1013 int cbase,
1014 const struct pmbus_sensor_attr *attr)
1015 {
1016 const struct pmbus_limit_attr *l = attr->limit;
1017 int nlimit = attr->nlimit;
1018 bool have_alarm = false;
1019 int i, cindex;
1020
1021 for (i = 0; i < nlimit; i++) {
1022 if (pmbus_check_word_register(client, page, l->reg)) {
1023 cindex = data->num_sensors;
1024 pmbus_add_sensor(data, name, l->attr, index, page,
1025 l->reg, attr->class,
1026 attr->update || l->update,
1027 false);
1028 if (l->sbit && (info->func[page] & attr->sfunc)) {
1029 if (attr->compare) {
1030 pmbus_add_boolean_cmp(data, name,
1031 l->alarm, index,
1032 l->low ? cindex : cbase,
1033 l->low ? cbase : cindex,
1034 attr->sbase + page, l->sbit);
1035 } else {
1036 pmbus_add_boolean_reg(data, name,
1037 l->alarm, index,
1038 attr->sbase + page, l->sbit);
1039 }
1040 have_alarm = true;
1041 }
1042 }
1043 l++;
1044 }
1045 return have_alarm;
1046 }
1047
1048 static void pmbus_add_sensor_attrs_one(struct i2c_client *client,
1049 struct pmbus_data *data,
1050 const struct pmbus_driver_info *info,
1051 const char *name,
1052 int index, int page,
1053 const struct pmbus_sensor_attr *attr)
1054 {
1055 bool have_alarm;
1056 int cbase = data->num_sensors;
1057
1058 if (attr->label)
1059 pmbus_add_label(data, name, index, attr->label,
1060 attr->paged ? page + 1 : 0);
1061 pmbus_add_sensor(data, name, "input", index, page, attr->reg,
1062 attr->class, true, true);
1063 if (attr->sfunc) {
1064 have_alarm = pmbus_add_limit_attrs(client, data, info, name,
1065 index, page, cbase, attr);
1066 /*
1067 * Add generic alarm attribute only if there are no individual
1068 * alarm attributes, if there is a global alarm bit, and if
1069 * the generic status register for this page is accessible.
1070 */
1071 if (!have_alarm && attr->gbit &&
1072 pmbus_check_byte_register(client, page, PMBUS_STATUS_BYTE))
1073 pmbus_add_boolean_reg(data, name, "alarm", index,
1074 PB_STATUS_BASE + page,
1075 attr->gbit);
1076 }
1077 }
1078
1079 static void pmbus_add_sensor_attrs(struct i2c_client *client,
1080 struct pmbus_data *data,
1081 const char *name,
1082 const struct pmbus_sensor_attr *attrs,
1083 int nattrs)
1084 {
1085 const struct pmbus_driver_info *info = data->info;
1086 int index, i;
1087
1088 index = 1;
1089 for (i = 0; i < nattrs; i++) {
1090 int page, pages;
1091
1092 pages = attrs->paged ? info->pages : 1;
1093 for (page = 0; page < pages; page++) {
1094 if (!(info->func[page] & attrs->func))
1095 continue;
1096 pmbus_add_sensor_attrs_one(client, data, info, name,
1097 index, page, attrs);
1098 index++;
1099 }
1100 attrs++;
1101 }
1102 }
1103
1104 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1105 {
1106 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1107 .attr = "min",
1108 .alarm = "min_alarm",
1109 .sbit = PB_VOLTAGE_UV_WARNING,
1110 }, {
1111 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1112 .attr = "lcrit",
1113 .alarm = "lcrit_alarm",
1114 .sbit = PB_VOLTAGE_UV_FAULT,
1115 }, {
1116 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1117 .attr = "max",
1118 .alarm = "max_alarm",
1119 .sbit = PB_VOLTAGE_OV_WARNING,
1120 }, {
1121 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1122 .attr = "crit",
1123 .alarm = "crit_alarm",
1124 .sbit = PB_VOLTAGE_OV_FAULT,
1125 }, {
1126 .reg = PMBUS_VIRT_READ_VIN_AVG,
1127 .update = true,
1128 .attr = "average",
1129 }, {
1130 .reg = PMBUS_VIRT_READ_VIN_MIN,
1131 .update = true,
1132 .attr = "lowest",
1133 }, {
1134 .reg = PMBUS_VIRT_READ_VIN_MAX,
1135 .update = true,
1136 .attr = "highest",
1137 }, {
1138 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1139 .attr = "reset_history",
1140 },
1141 };
1142
1143 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1144 {
1145 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1146 .attr = "min",
1147 .alarm = "min_alarm",
1148 .sbit = PB_VOLTAGE_UV_WARNING,
1149 }, {
1150 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1151 .attr = "lcrit",
1152 .alarm = "lcrit_alarm",
1153 .sbit = PB_VOLTAGE_UV_FAULT,
1154 }, {
1155 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1156 .attr = "max",
1157 .alarm = "max_alarm",
1158 .sbit = PB_VOLTAGE_OV_WARNING,
1159 }, {
1160 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1161 .attr = "crit",
1162 .alarm = "crit_alarm",
1163 .sbit = PB_VOLTAGE_OV_FAULT,
1164 }, {
1165 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1166 .update = true,
1167 .attr = "average",
1168 }, {
1169 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1170 .update = true,
1171 .attr = "lowest",
1172 }, {
1173 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1174 .update = true,
1175 .attr = "highest",
1176 }, {
1177 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1178 .attr = "reset_history",
1179 }
1180 };
1181
1182 static const struct pmbus_sensor_attr voltage_attributes[] = {
1183 {
1184 .reg = PMBUS_READ_VIN,
1185 .class = PSC_VOLTAGE_IN,
1186 .label = "vin",
1187 .func = PMBUS_HAVE_VIN,
1188 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1189 .sbase = PB_STATUS_INPUT_BASE,
1190 .gbit = PB_STATUS_VIN_UV,
1191 .limit = vin_limit_attrs,
1192 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1193 }, {
1194 .reg = PMBUS_READ_VCAP,
1195 .class = PSC_VOLTAGE_IN,
1196 .label = "vcap",
1197 .func = PMBUS_HAVE_VCAP,
1198 }, {
1199 .reg = PMBUS_READ_VOUT,
1200 .class = PSC_VOLTAGE_OUT,
1201 .label = "vout",
1202 .paged = true,
1203 .func = PMBUS_HAVE_VOUT,
1204 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1205 .sbase = PB_STATUS_VOUT_BASE,
1206 .gbit = PB_STATUS_VOUT_OV,
1207 .limit = vout_limit_attrs,
1208 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1209 }
1210 };
1211
1212 /* Current attributes */
1213
1214 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1215 {
1216 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1217 .attr = "max",
1218 .alarm = "max_alarm",
1219 .sbit = PB_IIN_OC_WARNING,
1220 }, {
1221 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1222 .attr = "crit",
1223 .alarm = "crit_alarm",
1224 .sbit = PB_IIN_OC_FAULT,
1225 }, {
1226 .reg = PMBUS_VIRT_READ_IIN_AVG,
1227 .update = true,
1228 .attr = "average",
1229 }, {
1230 .reg = PMBUS_VIRT_READ_IIN_MIN,
1231 .update = true,
1232 .attr = "lowest",
1233 }, {
1234 .reg = PMBUS_VIRT_READ_IIN_MAX,
1235 .update = true,
1236 .attr = "highest",
1237 }, {
1238 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1239 .attr = "reset_history",
1240 }
1241 };
1242
1243 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1244 {
1245 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1246 .attr = "max",
1247 .alarm = "max_alarm",
1248 .sbit = PB_IOUT_OC_WARNING,
1249 }, {
1250 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1251 .attr = "lcrit",
1252 .alarm = "lcrit_alarm",
1253 .sbit = PB_IOUT_UC_FAULT,
1254 }, {
1255 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1256 .attr = "crit",
1257 .alarm = "crit_alarm",
1258 .sbit = PB_IOUT_OC_FAULT,
1259 }, {
1260 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1261 .update = true,
1262 .attr = "average",
1263 }, {
1264 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1265 .update = true,
1266 .attr = "lowest",
1267 }, {
1268 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1269 .update = true,
1270 .attr = "highest",
1271 }, {
1272 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1273 .attr = "reset_history",
1274 }
1275 };
1276
1277 static const struct pmbus_sensor_attr current_attributes[] = {
1278 {
1279 .reg = PMBUS_READ_IIN,
1280 .class = PSC_CURRENT_IN,
1281 .label = "iin",
1282 .func = PMBUS_HAVE_IIN,
1283 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1284 .sbase = PB_STATUS_INPUT_BASE,
1285 .limit = iin_limit_attrs,
1286 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1287 }, {
1288 .reg = PMBUS_READ_IOUT,
1289 .class = PSC_CURRENT_OUT,
1290 .label = "iout",
1291 .paged = true,
1292 .func = PMBUS_HAVE_IOUT,
1293 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1294 .sbase = PB_STATUS_IOUT_BASE,
1295 .gbit = PB_STATUS_IOUT_OC,
1296 .limit = iout_limit_attrs,
1297 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1298 }
1299 };
1300
1301 /* Power attributes */
1302
1303 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1304 {
1305 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1306 .attr = "max",
1307 .alarm = "alarm",
1308 .sbit = PB_PIN_OP_WARNING,
1309 }, {
1310 .reg = PMBUS_VIRT_READ_PIN_AVG,
1311 .update = true,
1312 .attr = "average",
1313 }, {
1314 .reg = PMBUS_VIRT_READ_PIN_MAX,
1315 .update = true,
1316 .attr = "input_highest",
1317 }, {
1318 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1319 .attr = "reset_history",
1320 }
1321 };
1322
1323 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1324 {
1325 .reg = PMBUS_POUT_MAX,
1326 .attr = "cap",
1327 .alarm = "cap_alarm",
1328 .sbit = PB_POWER_LIMITING,
1329 }, {
1330 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1331 .attr = "max",
1332 .alarm = "max_alarm",
1333 .sbit = PB_POUT_OP_WARNING,
1334 }, {
1335 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1336 .attr = "crit",
1337 .alarm = "crit_alarm",
1338 .sbit = PB_POUT_OP_FAULT,
1339 }, {
1340 .reg = PMBUS_VIRT_READ_POUT_AVG,
1341 .update = true,
1342 .attr = "average",
1343 }, {
1344 .reg = PMBUS_VIRT_READ_POUT_MAX,
1345 .update = true,
1346 .attr = "input_highest",
1347 }, {
1348 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1349 .attr = "reset_history",
1350 }
1351 };
1352
1353 static const struct pmbus_sensor_attr power_attributes[] = {
1354 {
1355 .reg = PMBUS_READ_PIN,
1356 .class = PSC_POWER,
1357 .label = "pin",
1358 .func = PMBUS_HAVE_PIN,
1359 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1360 .sbase = PB_STATUS_INPUT_BASE,
1361 .limit = pin_limit_attrs,
1362 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1363 }, {
1364 .reg = PMBUS_READ_POUT,
1365 .class = PSC_POWER,
1366 .label = "pout",
1367 .paged = true,
1368 .func = PMBUS_HAVE_POUT,
1369 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1370 .sbase = PB_STATUS_IOUT_BASE,
1371 .limit = pout_limit_attrs,
1372 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1373 }
1374 };
1375
1376 /* Temperature atributes */
1377
1378 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1379 {
1380 .reg = PMBUS_UT_WARN_LIMIT,
1381 .low = true,
1382 .attr = "min",
1383 .alarm = "min_alarm",
1384 .sbit = PB_TEMP_UT_WARNING,
1385 }, {
1386 .reg = PMBUS_UT_FAULT_LIMIT,
1387 .low = true,
1388 .attr = "lcrit",
1389 .alarm = "lcrit_alarm",
1390 .sbit = PB_TEMP_UT_FAULT,
1391 }, {
1392 .reg = PMBUS_OT_WARN_LIMIT,
1393 .attr = "max",
1394 .alarm = "max_alarm",
1395 .sbit = PB_TEMP_OT_WARNING,
1396 }, {
1397 .reg = PMBUS_OT_FAULT_LIMIT,
1398 .attr = "crit",
1399 .alarm = "crit_alarm",
1400 .sbit = PB_TEMP_OT_FAULT,
1401 }, {
1402 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1403 .attr = "lowest",
1404 }, {
1405 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1406 .attr = "average",
1407 }, {
1408 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1409 .attr = "highest",
1410 }, {
1411 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1412 .attr = "reset_history",
1413 }
1414 };
1415
1416 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1417 {
1418 .reg = PMBUS_UT_WARN_LIMIT,
1419 .low = true,
1420 .attr = "min",
1421 .alarm = "min_alarm",
1422 .sbit = PB_TEMP_UT_WARNING,
1423 }, {
1424 .reg = PMBUS_UT_FAULT_LIMIT,
1425 .low = true,
1426 .attr = "lcrit",
1427 .alarm = "lcrit_alarm",
1428 .sbit = PB_TEMP_UT_FAULT,
1429 }, {
1430 .reg = PMBUS_OT_WARN_LIMIT,
1431 .attr = "max",
1432 .alarm = "max_alarm",
1433 .sbit = PB_TEMP_OT_WARNING,
1434 }, {
1435 .reg = PMBUS_OT_FAULT_LIMIT,
1436 .attr = "crit",
1437 .alarm = "crit_alarm",
1438 .sbit = PB_TEMP_OT_FAULT,
1439 }, {
1440 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1441 .attr = "lowest",
1442 }, {
1443 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1444 .attr = "average",
1445 }, {
1446 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1447 .attr = "highest",
1448 }, {
1449 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1450 .attr = "reset_history",
1451 }
1452 };
1453
1454 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1455 {
1456 .reg = PMBUS_UT_WARN_LIMIT,
1457 .low = true,
1458 .attr = "min",
1459 .alarm = "min_alarm",
1460 .sbit = PB_TEMP_UT_WARNING,
1461 }, {
1462 .reg = PMBUS_UT_FAULT_LIMIT,
1463 .low = true,
1464 .attr = "lcrit",
1465 .alarm = "lcrit_alarm",
1466 .sbit = PB_TEMP_UT_FAULT,
1467 }, {
1468 .reg = PMBUS_OT_WARN_LIMIT,
1469 .attr = "max",
1470 .alarm = "max_alarm",
1471 .sbit = PB_TEMP_OT_WARNING,
1472 }, {
1473 .reg = PMBUS_OT_FAULT_LIMIT,
1474 .attr = "crit",
1475 .alarm = "crit_alarm",
1476 .sbit = PB_TEMP_OT_FAULT,
1477 }
1478 };
1479
1480 static const struct pmbus_sensor_attr temp_attributes[] = {
1481 {
1482 .reg = PMBUS_READ_TEMPERATURE_1,
1483 .class = PSC_TEMPERATURE,
1484 .paged = true,
1485 .update = true,
1486 .compare = true,
1487 .func = PMBUS_HAVE_TEMP,
1488 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1489 .sbase = PB_STATUS_TEMP_BASE,
1490 .gbit = PB_STATUS_TEMPERATURE,
1491 .limit = temp_limit_attrs,
1492 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1493 }, {
1494 .reg = PMBUS_READ_TEMPERATURE_2,
1495 .class = PSC_TEMPERATURE,
1496 .paged = true,
1497 .update = true,
1498 .compare = true,
1499 .func = PMBUS_HAVE_TEMP2,
1500 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1501 .sbase = PB_STATUS_TEMP_BASE,
1502 .gbit = PB_STATUS_TEMPERATURE,
1503 .limit = temp_limit_attrs2,
1504 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1505 }, {
1506 .reg = PMBUS_READ_TEMPERATURE_3,
1507 .class = PSC_TEMPERATURE,
1508 .paged = true,
1509 .update = true,
1510 .compare = true,
1511 .func = PMBUS_HAVE_TEMP3,
1512 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1513 .sbase = PB_STATUS_TEMP_BASE,
1514 .gbit = PB_STATUS_TEMPERATURE,
1515 .limit = temp_limit_attrs3,
1516 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1517 }
1518 };
1519
1520 static const int pmbus_fan_registers[] = {
1521 PMBUS_READ_FAN_SPEED_1,
1522 PMBUS_READ_FAN_SPEED_2,
1523 PMBUS_READ_FAN_SPEED_3,
1524 PMBUS_READ_FAN_SPEED_4
1525 };
1526
1527 static const int pmbus_fan_config_registers[] = {
1528 PMBUS_FAN_CONFIG_12,
1529 PMBUS_FAN_CONFIG_12,
1530 PMBUS_FAN_CONFIG_34,
1531 PMBUS_FAN_CONFIG_34
1532 };
1533
1534 static const int pmbus_fan_status_registers[] = {
1535 PMBUS_STATUS_FAN_12,
1536 PMBUS_STATUS_FAN_12,
1537 PMBUS_STATUS_FAN_34,
1538 PMBUS_STATUS_FAN_34
1539 };
1540
1541 static const u32 pmbus_fan_flags[] = {
1542 PMBUS_HAVE_FAN12,
1543 PMBUS_HAVE_FAN12,
1544 PMBUS_HAVE_FAN34,
1545 PMBUS_HAVE_FAN34
1546 };
1547
1548 static const u32 pmbus_fan_status_flags[] = {
1549 PMBUS_HAVE_STATUS_FAN12,
1550 PMBUS_HAVE_STATUS_FAN12,
1551 PMBUS_HAVE_STATUS_FAN34,
1552 PMBUS_HAVE_STATUS_FAN34
1553 };
1554
1555 /* Fans */
1556 static void pmbus_add_fan_attributes(struct i2c_client *client,
1557 struct pmbus_data *data)
1558 {
1559 const struct pmbus_driver_info *info = data->info;
1560 int index = 1;
1561 int page;
1562
1563 for (page = 0; page < info->pages; page++) {
1564 int f;
1565
1566 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1567 int regval;
1568
1569 if (!(info->func[page] & pmbus_fan_flags[f]))
1570 break;
1571
1572 if (!pmbus_check_word_register(client, page,
1573 pmbus_fan_registers[f]))
1574 break;
1575
1576 /*
1577 * Skip fan if not installed.
1578 * Each fan configuration register covers multiple fans,
1579 * so we have to do some magic.
1580 */
1581 regval = _pmbus_read_byte_data(client, page,
1582 pmbus_fan_config_registers[f]);
1583 if (regval < 0 ||
1584 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1585 continue;
1586
1587 pmbus_add_sensor(data, "fan", "input", index, page,
1588 pmbus_fan_registers[f], PSC_FAN, true,
1589 true);
1590
1591 /*
1592 * Each fan status register covers multiple fans,
1593 * so we have to do some magic.
1594 */
1595 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1596 pmbus_check_byte_register(client,
1597 page, pmbus_fan_status_registers[f])) {
1598 int base;
1599
1600 if (f > 1) /* fan 3, 4 */
1601 base = PB_STATUS_FAN34_BASE + page;
1602 else
1603 base = PB_STATUS_FAN_BASE + page;
1604 pmbus_add_boolean_reg(data, "fan", "alarm",
1605 index, base,
1606 PB_FAN_FAN1_WARNING >> (f & 1));
1607 pmbus_add_boolean_reg(data, "fan", "fault",
1608 index, base,
1609 PB_FAN_FAN1_FAULT >> (f & 1));
1610 }
1611 index++;
1612 }
1613 }
1614 }
1615
1616 static void pmbus_find_attributes(struct i2c_client *client,
1617 struct pmbus_data *data)
1618 {
1619 /* Voltage sensors */
1620 pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1621 ARRAY_SIZE(voltage_attributes));
1622
1623 /* Current sensors */
1624 pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1625 ARRAY_SIZE(current_attributes));
1626
1627 /* Power sensors */
1628 pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1629 ARRAY_SIZE(power_attributes));
1630
1631 /* Temperature sensors */
1632 pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1633 ARRAY_SIZE(temp_attributes));
1634
1635 /* Fans */
1636 pmbus_add_fan_attributes(client, data);
1637 }
1638
1639 /*
1640 * Identify chip parameters.
1641 * This function is called for all chips.
1642 */
1643 static int pmbus_identify_common(struct i2c_client *client,
1644 struct pmbus_data *data)
1645 {
1646 int vout_mode = -1;
1647
1648 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1649 vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1650 if (vout_mode >= 0 && vout_mode != 0xff) {
1651 /*
1652 * Not all chips support the VOUT_MODE command,
1653 * so a failure to read it is not an error.
1654 */
1655 switch (vout_mode >> 5) {
1656 case 0: /* linear mode */
1657 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1658 return -ENODEV;
1659
1660 data->exponent = ((s8)(vout_mode << 3)) >> 3;
1661 break;
1662 case 1: /* VID mode */
1663 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1664 return -ENODEV;
1665 break;
1666 case 2: /* direct mode */
1667 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1668 return -ENODEV;
1669 break;
1670 default:
1671 return -ENODEV;
1672 }
1673 }
1674
1675 /* Determine maximum number of sensors, booleans, and labels */
1676 pmbus_find_max_attr(client, data);
1677 pmbus_clear_fault_page(client, 0);
1678 return 0;
1679 }
1680
1681 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1682 struct pmbus_driver_info *info)
1683 {
1684 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1685 struct pmbus_data *data;
1686 int ret;
1687
1688 if (!info) {
1689 dev_err(&client->dev, "Missing chip information");
1690 return -ENODEV;
1691 }
1692
1693 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1694 | I2C_FUNC_SMBUS_BYTE_DATA
1695 | I2C_FUNC_SMBUS_WORD_DATA))
1696 return -ENODEV;
1697
1698 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
1699 if (!data) {
1700 dev_err(&client->dev, "No memory to allocate driver data\n");
1701 return -ENOMEM;
1702 }
1703
1704 i2c_set_clientdata(client, data);
1705 mutex_init(&data->update_lock);
1706
1707 /* Bail out if PMBus status register does not exist. */
1708 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
1709 dev_err(&client->dev, "PMBus status register not found\n");
1710 return -ENODEV;
1711 }
1712
1713 if (pdata)
1714 data->flags = pdata->flags;
1715 data->info = info;
1716
1717 pmbus_clear_faults(client);
1718
1719 if (info->identify) {
1720 ret = (*info->identify)(client, info);
1721 if (ret < 0) {
1722 dev_err(&client->dev, "Chip identification failed\n");
1723 return ret;
1724 }
1725 }
1726
1727 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1728 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1729 info->pages);
1730 return -ENODEV;
1731 }
1732
1733 ret = pmbus_identify_common(client, data);
1734 if (ret < 0) {
1735 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1736 return ret;
1737 }
1738
1739 ret = -ENOMEM;
1740 data->sensors = devm_kzalloc(&client->dev, sizeof(struct pmbus_sensor)
1741 * data->max_sensors, GFP_KERNEL);
1742 if (!data->sensors) {
1743 dev_err(&client->dev, "No memory to allocate sensor data\n");
1744 return -ENOMEM;
1745 }
1746
1747 data->booleans = devm_kzalloc(&client->dev, sizeof(struct pmbus_boolean)
1748 * data->max_booleans, GFP_KERNEL);
1749 if (!data->booleans) {
1750 dev_err(&client->dev, "No memory to allocate boolean data\n");
1751 return -ENOMEM;
1752 }
1753
1754 data->labels = devm_kzalloc(&client->dev, sizeof(struct pmbus_label)
1755 * data->max_labels, GFP_KERNEL);
1756 if (!data->labels) {
1757 dev_err(&client->dev, "No memory to allocate label data\n");
1758 return -ENOMEM;
1759 }
1760
1761 data->attributes = devm_kzalloc(&client->dev, sizeof(struct attribute *)
1762 * data->max_attributes, GFP_KERNEL);
1763 if (!data->attributes) {
1764 dev_err(&client->dev, "No memory to allocate attribute data\n");
1765 return -ENOMEM;
1766 }
1767
1768 pmbus_find_attributes(client, data);
1769
1770 /*
1771 * If there are no attributes, something is wrong.
1772 * Bail out instead of trying to register nothing.
1773 */
1774 if (!data->num_attributes) {
1775 dev_err(&client->dev, "No attributes found\n");
1776 return -ENODEV;
1777 }
1778
1779 /* Register sysfs hooks */
1780 data->group.attrs = data->attributes;
1781 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1782 if (ret) {
1783 dev_err(&client->dev, "Failed to create sysfs entries\n");
1784 return ret;
1785 }
1786 data->hwmon_dev = hwmon_device_register(&client->dev);
1787 if (IS_ERR(data->hwmon_dev)) {
1788 ret = PTR_ERR(data->hwmon_dev);
1789 dev_err(&client->dev, "Failed to register hwmon device\n");
1790 goto out_hwmon_device_register;
1791 }
1792 return 0;
1793
1794 out_hwmon_device_register:
1795 sysfs_remove_group(&client->dev.kobj, &data->group);
1796 return ret;
1797 }
1798 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1799
1800 int pmbus_do_remove(struct i2c_client *client)
1801 {
1802 struct pmbus_data *data = i2c_get_clientdata(client);
1803 hwmon_device_unregister(data->hwmon_dev);
1804 sysfs_remove_group(&client->dev.kobj, &data->group);
1805 return 0;
1806 }
1807 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1808
1809 MODULE_AUTHOR("Guenter Roeck");
1810 MODULE_DESCRIPTION("PMBus core driver");
1811 MODULE_LICENSE("GPL");
Linux with added FPC-III support