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Merge 3.1-rc1 into usb-linus
[zen-stable.git] / drivers / hwmon / pmbus / pmbus_core.c
blob5c1b6cf317012682875cd2d74e6388189b33009d
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/delay.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 4 /* input, cap, max, crit */
44 #define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
45 #define PMBUS_MAX_SENSORS_PER_TEMP 8 /* input, min, max, lcrit,
46 crit, lowest, highest,
47 reset */
48
49 #define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
50 lcrit_alarm, crit_alarm;
51 c: alarm, crit_alarm;
52 p: crit_alarm */
53 #define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
54 lcrit_alarm, crit_alarm */
55 #define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
56 crit_alarm */
57 #define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
58 #define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
59 #define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
60 lcrit_alarm, crit_alarm */
61
62 #define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
63
64 /*
65 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
66 * are paged. status_input is unpaged.
67 */
68 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
69
70 /*
71 * Index into status register array, per status register group
72 */
73 #define PB_STATUS_BASE 0
74 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
75 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
76 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
77 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
78 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
79 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
80
81 #define PMBUS_NAME_SIZE 24
82
83 struct pmbus_sensor {
84 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
85 struct sensor_device_attribute attribute;
86 u8 page; /* page number */
87 u16 reg; /* register */
88 enum pmbus_sensor_classes class; /* sensor class */
89 bool update; /* runtime sensor update needed */
90 int data; /* Sensor data.
91 Negative if there was a read error */
92 };
93
94 struct pmbus_boolean {
95 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
96 struct sensor_device_attribute attribute;
97 };
98
99 struct pmbus_label {
100 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
101 struct sensor_device_attribute attribute;
102 char label[PMBUS_NAME_SIZE]; /* label */
103 };
104
105 struct pmbus_data {
106 struct device *hwmon_dev;
107
108 u32 flags; /* from platform data */
109
110 int exponent; /* linear mode: exponent for output voltages */
111
112 const struct pmbus_driver_info *info;
113
114 int max_attributes;
115 int num_attributes;
116 struct attribute **attributes;
117 struct attribute_group group;
118
119 /*
120 * Sensors cover both sensor and limit registers.
121 */
122 int max_sensors;
123 int num_sensors;
124 struct pmbus_sensor *sensors;
125 /*
126 * Booleans are used for alarms.
127 * Values are determined from status registers.
128 */
129 int max_booleans;
130 int num_booleans;
131 struct pmbus_boolean *booleans;
132 /*
133 * Labels are used to map generic names (e.g., "in1")
134 * to PMBus specific names (e.g., "vin" or "vout1").
135 */
136 int max_labels;
137 int num_labels;
138 struct pmbus_label *labels;
139
140 struct mutex update_lock;
141 bool valid;
142 unsigned long last_updated; /* in jiffies */
143
144 /*
145 * A single status register covers multiple attributes,
146 * so we keep them all together.
147 */
148 u8 status[PB_NUM_STATUS_REG];
149
150 u8 currpage;
151 };
152
153 int pmbus_set_page(struct i2c_client *client, u8 page)
154 {
155 struct pmbus_data *data = i2c_get_clientdata(client);
156 int rv = 0;
157 int newpage;
158
159 if (page != data->currpage) {
160 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
161 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
162 if (newpage != page)
163 rv = -EINVAL;
164 else
165 data->currpage = page;
166 }
167 return rv;
168 }
169 EXPORT_SYMBOL_GPL(pmbus_set_page);
170
171 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
172 {
173 int rv;
174
175 if (page >= 0) {
176 rv = pmbus_set_page(client, page);
177 if (rv < 0)
178 return rv;
179 }
180
181 return i2c_smbus_write_byte(client, value);
182 }
183 EXPORT_SYMBOL_GPL(pmbus_write_byte);
184
185 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
186 {
187 int rv;
188
189 rv = pmbus_set_page(client, page);
190 if (rv < 0)
191 return rv;
192
193 return i2c_smbus_write_word_data(client, reg, word);
194 }
195 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
196
197 /*
198 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
199 * a device specific mapping function exists and calls it if necessary.
200 */
201 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
202 u16 word)
203 {
204 struct pmbus_data *data = i2c_get_clientdata(client);
205 const struct pmbus_driver_info *info = data->info;
206 int status;
207
208 if (info->write_word_data) {
209 status = info->write_word_data(client, page, reg, word);
210 if (status != -ENODATA)
211 return status;
212 }
213 if (reg >= PMBUS_VIRT_BASE)
214 return -EINVAL;
215 return pmbus_write_word_data(client, page, reg, word);
216 }
217
218 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
219 {
220 int rv;
221
222 rv = pmbus_set_page(client, page);
223 if (rv < 0)
224 return rv;
225
226 return i2c_smbus_read_word_data(client, reg);
227 }
228 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
229
230 /*
231 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
232 * a device specific mapping function exists and calls it if necessary.
233 */
234 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
235 {
236 struct pmbus_data *data = i2c_get_clientdata(client);
237 const struct pmbus_driver_info *info = data->info;
238 int status;
239
240 if (info->read_word_data) {
241 status = info->read_word_data(client, page, reg);
242 if (status != -ENODATA)
243 return status;
244 }
245 if (reg >= PMBUS_VIRT_BASE)
246 return -EINVAL;
247 return pmbus_read_word_data(client, page, reg);
248 }
249
250 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
251 {
252 int rv;
253
254 if (page >= 0) {
255 rv = pmbus_set_page(client, page);
256 if (rv < 0)
257 return rv;
258 }
259
260 return i2c_smbus_read_byte_data(client, reg);
261 }
262 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
263
264 /*
265 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
266 * a device specific mapping function exists and calls it if necessary.
267 */
268 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
269 {
270 struct pmbus_data *data = i2c_get_clientdata(client);
271 const struct pmbus_driver_info *info = data->info;
272 int status;
273
274 if (info->read_byte_data) {
275 status = info->read_byte_data(client, page, reg);
276 if (status != -ENODATA)
277 return status;
278 }
279 return pmbus_read_byte_data(client, page, reg);
280 }
281
282 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
283 {
284 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
285 }
286
287 void pmbus_clear_faults(struct i2c_client *client)
288 {
289 struct pmbus_data *data = i2c_get_clientdata(client);
290 int i;
291
292 for (i = 0; i < data->info->pages; i++)
293 pmbus_clear_fault_page(client, i);
294 }
295 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
296
297 static int pmbus_check_status_cml(struct i2c_client *client)
298 {
299 int status, status2;
300
301 status = pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE);
302 if (status < 0 || (status & PB_STATUS_CML)) {
303 status2 = pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
304 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
305 return -EINVAL;
306 }
307 return 0;
308 }
309
310 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
311 {
312 int rv;
313 struct pmbus_data *data = i2c_get_clientdata(client);
314
315 rv = _pmbus_read_byte_data(client, page, reg);
316 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
317 rv = pmbus_check_status_cml(client);
318 pmbus_clear_fault_page(client, -1);
319 return rv >= 0;
320 }
321 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
322
323 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
324 {
325 int rv;
326 struct pmbus_data *data = i2c_get_clientdata(client);
327
328 rv = _pmbus_read_word_data(client, page, reg);
329 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
330 rv = pmbus_check_status_cml(client);
331 pmbus_clear_fault_page(client, -1);
332 return rv >= 0;
333 }
334 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
335
336 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
337 {
338 struct pmbus_data *data = i2c_get_clientdata(client);
339
340 return data->info;
341 }
342 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
343
344 static struct pmbus_data *pmbus_update_device(struct device *dev)
345 {
346 struct i2c_client *client = to_i2c_client(dev);
347 struct pmbus_data *data = i2c_get_clientdata(client);
348 const struct pmbus_driver_info *info = data->info;
349
350 mutex_lock(&data->update_lock);
351 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
352 int i;
353
354 for (i = 0; i < info->pages; i++)
355 data->status[PB_STATUS_BASE + i]
356 = pmbus_read_byte_data(client, i,
357 PMBUS_STATUS_BYTE);
358 for (i = 0; i < info->pages; i++) {
359 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
360 continue;
361 data->status[PB_STATUS_VOUT_BASE + i]
362 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT);
363 }
364 for (i = 0; i < info->pages; i++) {
365 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
366 continue;
367 data->status[PB_STATUS_IOUT_BASE + i]
368 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT);
369 }
370 for (i = 0; i < info->pages; i++) {
371 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
372 continue;
373 data->status[PB_STATUS_TEMP_BASE + i]
374 = _pmbus_read_byte_data(client, i,
375 PMBUS_STATUS_TEMPERATURE);
376 }
377 for (i = 0; i < info->pages; i++) {
378 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
379 continue;
380 data->status[PB_STATUS_FAN_BASE + i]
381 = _pmbus_read_byte_data(client, i,
382 PMBUS_STATUS_FAN_12);
383 }
384
385 for (i = 0; i < info->pages; i++) {
386 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
387 continue;
388 data->status[PB_STATUS_FAN34_BASE + i]
389 = _pmbus_read_byte_data(client, i,
390 PMBUS_STATUS_FAN_34);
391 }
392
393 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
394 data->status[PB_STATUS_INPUT_BASE]
395 = _pmbus_read_byte_data(client, 0,
396 PMBUS_STATUS_INPUT);
397
398 for (i = 0; i < data->num_sensors; i++) {
399 struct pmbus_sensor *sensor = &data->sensors[i];
400
401 if (!data->valid || sensor->update)
402 sensor->data
403 = _pmbus_read_word_data(client,
404 sensor->page,
405 sensor->reg);
406 }
407 pmbus_clear_faults(client);
408 data->last_updated = jiffies;
409 data->valid = 1;
410 }
411 mutex_unlock(&data->update_lock);
412 return data;
413 }
414
415 /*
416 * Convert linear sensor values to milli- or micro-units
417 * depending on sensor type.
418 */
419 static long pmbus_reg2data_linear(struct pmbus_data *data,
420 struct pmbus_sensor *sensor)
421 {
422 s16 exponent;
423 s32 mantissa;
424 long val;
425
426 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
427 exponent = data->exponent;
428 mantissa = (u16) sensor->data;
429 } else { /* LINEAR11 */
430 exponent = (sensor->data >> 11) & 0x001f;
431 mantissa = sensor->data & 0x07ff;
432
433 if (exponent > 0x0f)
434 exponent |= 0xffe0; /* sign extend exponent */
435 if (mantissa > 0x03ff)
436 mantissa |= 0xfffff800; /* sign extend mantissa */
437 }
438
439 val = mantissa;
440
441 /* scale result to milli-units for all sensors except fans */
442 if (sensor->class != PSC_FAN)
443 val = val * 1000L;
444
445 /* scale result to micro-units for power sensors */
446 if (sensor->class == PSC_POWER)
447 val = val * 1000L;
448
449 if (exponent >= 0)
450 val <<= exponent;
451 else
452 val >>= -exponent;
453
454 return val;
455 }
456
457 /*
458 * Convert direct sensor values to milli- or micro-units
459 * depending on sensor type.
460 */
461 static long pmbus_reg2data_direct(struct pmbus_data *data,
462 struct pmbus_sensor *sensor)
463 {
464 long val = (s16) sensor->data;
465 long m, b, R;
466
467 m = data->info->m[sensor->class];
468 b = data->info->b[sensor->class];
469 R = data->info->R[sensor->class];
470
471 if (m == 0)
472 return 0;
473
474 /* X = 1/m * (Y * 10^-R - b) */
475 R = -R;
476 /* scale result to milli-units for everything but fans */
477 if (sensor->class != PSC_FAN) {
478 R += 3;
479 b *= 1000;
480 }
481
482 /* scale result to micro-units for power sensors */
483 if (sensor->class == PSC_POWER) {
484 R += 3;
485 b *= 1000;
486 }
487
488 while (R > 0) {
489 val *= 10;
490 R--;
491 }
492 while (R < 0) {
493 val = DIV_ROUND_CLOSEST(val, 10);
494 R++;
495 }
496
497 return (val - b) / m;
498 }
499
500 /*
501 * Convert VID sensor values to milli- or micro-units
502 * depending on sensor type.
503 * We currently only support VR11.
504 */
505 static long pmbus_reg2data_vid(struct pmbus_data *data,
506 struct pmbus_sensor *sensor)
507 {
508 long val = sensor->data;
509
510 if (val < 0x02 || val > 0xb2)
511 return 0;
512 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
513 }
514
515 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
516 {
517 long val;
518
519 switch (data->info->format[sensor->class]) {
520 case direct:
521 val = pmbus_reg2data_direct(data, sensor);
522 break;
523 case vid:
524 val = pmbus_reg2data_vid(data, sensor);
525 break;
526 case linear:
527 default:
528 val = pmbus_reg2data_linear(data, sensor);
529 break;
530 }
531 return val;
532 }
533
534 #define MAX_MANTISSA (1023 * 1000)
535 #define MIN_MANTISSA (511 * 1000)
536
537 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
538 enum pmbus_sensor_classes class, long val)
539 {
540 s16 exponent = 0, mantissa;
541 bool negative = false;
542
543 /* simple case */
544 if (val == 0)
545 return 0;
546
547 if (class == PSC_VOLTAGE_OUT) {
548 /* LINEAR16 does not support negative voltages */
549 if (val < 0)
550 return 0;
551
552 /*
553 * For a static exponents, we don't have a choice
554 * but to adjust the value to it.
555 */
556 if (data->exponent < 0)
557 val <<= -data->exponent;
558 else
559 val >>= data->exponent;
560 val = DIV_ROUND_CLOSEST(val, 1000);
561 return val & 0xffff;
562 }
563
564 if (val < 0) {
565 negative = true;
566 val = -val;
567 }
568
569 /* Power is in uW. Convert to mW before converting. */
570 if (class == PSC_POWER)
571 val = DIV_ROUND_CLOSEST(val, 1000L);
572
573 /*
574 * For simplicity, convert fan data to milli-units
575 * before calculating the exponent.
576 */
577 if (class == PSC_FAN)
578 val = val * 1000;
579
580 /* Reduce large mantissa until it fits into 10 bit */
581 while (val >= MAX_MANTISSA && exponent < 15) {
582 exponent++;
583 val >>= 1;
584 }
585 /* Increase small mantissa to improve precision */
586 while (val < MIN_MANTISSA && exponent > -15) {
587 exponent--;
588 val <<= 1;
589 }
590
591 /* Convert mantissa from milli-units to units */
592 mantissa = DIV_ROUND_CLOSEST(val, 1000);
593
594 /* Ensure that resulting number is within range */
595 if (mantissa > 0x3ff)
596 mantissa = 0x3ff;
597
598 /* restore sign */
599 if (negative)
600 mantissa = -mantissa;
601
602 /* Convert to 5 bit exponent, 11 bit mantissa */
603 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
604 }
605
606 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
607 enum pmbus_sensor_classes class, long val)
608 {
609 long m, b, R;
610
611 m = data->info->m[class];
612 b = data->info->b[class];
613 R = data->info->R[class];
614
615 /* Power is in uW. Adjust R and b. */
616 if (class == PSC_POWER) {
617 R -= 3;
618 b *= 1000;
619 }
620
621 /* Calculate Y = (m * X + b) * 10^R */
622 if (class != PSC_FAN) {
623 R -= 3; /* Adjust R and b for data in milli-units */
624 b *= 1000;
625 }
626 val = val * m + b;
627
628 while (R > 0) {
629 val *= 10;
630 R--;
631 }
632 while (R < 0) {
633 val = DIV_ROUND_CLOSEST(val, 10);
634 R++;
635 }
636
637 return val;
638 }
639
640 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
641 enum pmbus_sensor_classes class, long val)
642 {
643 val = SENSORS_LIMIT(val, 500, 1600);
644
645 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
646 }
647
648 static u16 pmbus_data2reg(struct pmbus_data *data,
649 enum pmbus_sensor_classes class, long val)
650 {
651 u16 regval;
652
653 switch (data->info->format[class]) {
654 case direct:
655 regval = pmbus_data2reg_direct(data, class, val);
656 break;
657 case vid:
658 regval = pmbus_data2reg_vid(data, class, val);
659 break;
660 case linear:
661 default:
662 regval = pmbus_data2reg_linear(data, class, val);
663 break;
664 }
665 return regval;
666 }
667
668 /*
669 * Return boolean calculated from converted data.
670 * <index> defines a status register index and mask, and optionally
671 * two sensor indexes.
672 * The upper half-word references the two sensors,
673 * two sensor indices.
674 * The upper half-word references the two optional sensors,
675 * the lower half word references status register and mask.
676 * The function returns true if (status[reg] & mask) is true and,
677 * if specified, if v1 >= v2.
678 * To determine if an object exceeds upper limits, specify <v, limit>.
679 * To determine if an object exceeds lower limits, specify <limit, v>.
680 *
681 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
682 * index are set. s1 and s2 (the sensor index values) are zero in this case.
683 * The function returns true if (status[reg] & mask) is true.
684 *
685 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
686 * a specified limit has to be performed to determine the boolean result.
687 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
688 * sensor values referenced by sensor indices s1 and s2).
689 *
690 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
691 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
692 *
693 * If a negative value is stored in any of the referenced registers, this value
694 * reflects an error code which will be returned.
695 */
696 static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
697 {
698 u8 s1 = (index >> 24) & 0xff;
699 u8 s2 = (index >> 16) & 0xff;
700 u8 reg = (index >> 8) & 0xff;
701 u8 mask = index & 0xff;
702 int status;
703 u8 regval;
704
705 status = data->status[reg];
706 if (status < 0)
707 return status;
708
709 regval = status & mask;
710 if (!s1 && !s2)
711 *val = !!regval;
712 else {
713 long v1, v2;
714 struct pmbus_sensor *sensor1, *sensor2;
715
716 sensor1 = &data->sensors[s1];
717 if (sensor1->data < 0)
718 return sensor1->data;
719 sensor2 = &data->sensors[s2];
720 if (sensor2->data < 0)
721 return sensor2->data;
722
723 v1 = pmbus_reg2data(data, sensor1);
724 v2 = pmbus_reg2data(data, sensor2);
725 *val = !!(regval && v1 >= v2);
726 }
727 return 0;
728 }
729
730 static ssize_t pmbus_show_boolean(struct device *dev,
731 struct device_attribute *da, char *buf)
732 {
733 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
734 struct pmbus_data *data = pmbus_update_device(dev);
735 int val;
736 int err;
737
738 err = pmbus_get_boolean(data, attr->index, &val);
739 if (err)
740 return err;
741 return snprintf(buf, PAGE_SIZE, "%d\n", val);
742 }
743
744 static ssize_t pmbus_show_sensor(struct device *dev,
745 struct device_attribute *da, char *buf)
746 {
747 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
748 struct pmbus_data *data = pmbus_update_device(dev);
749 struct pmbus_sensor *sensor;
750
751 sensor = &data->sensors[attr->index];
752 if (sensor->data < 0)
753 return sensor->data;
754
755 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
756 }
757
758 static ssize_t pmbus_set_sensor(struct device *dev,
759 struct device_attribute *devattr,
760 const char *buf, size_t count)
761 {
762 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
763 struct i2c_client *client = to_i2c_client(dev);
764 struct pmbus_data *data = i2c_get_clientdata(client);
765 struct pmbus_sensor *sensor = &data->sensors[attr->index];
766 ssize_t rv = count;
767 long val = 0;
768 int ret;
769 u16 regval;
770
771 if (strict_strtol(buf, 10, &val) < 0)
772 return -EINVAL;
773
774 mutex_lock(&data->update_lock);
775 regval = pmbus_data2reg(data, sensor->class, val);
776 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
777 if (ret < 0)
778 rv = ret;
779 else
780 data->sensors[attr->index].data = regval;
781 mutex_unlock(&data->update_lock);
782 return rv;
783 }
784
785 static ssize_t pmbus_show_label(struct device *dev,
786 struct device_attribute *da, char *buf)
787 {
788 struct i2c_client *client = to_i2c_client(dev);
789 struct pmbus_data *data = i2c_get_clientdata(client);
790 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
791
792 return snprintf(buf, PAGE_SIZE, "%s\n",
793 data->labels[attr->index].label);
794 }
795
796 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
797 do { \
798 struct sensor_device_attribute *a \
799 = &data->_type##s[data->num_##_type##s].attribute; \
800 BUG_ON(data->num_attributes >= data->max_attributes); \
801 sysfs_attr_init(&a->dev_attr.attr); \
802 a->dev_attr.attr.name = _name; \
803 a->dev_attr.attr.mode = _mode; \
804 a->dev_attr.show = _show; \
805 a->dev_attr.store = _set; \
806 a->index = _idx; \
807 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
808 data->num_attributes++; \
809 } while (0)
810
811 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
812 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
813 pmbus_show_##_type, NULL)
814
815 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
816 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
817 pmbus_show_##_type, pmbus_set_##_type)
818
819 static void pmbus_add_boolean(struct pmbus_data *data,
820 const char *name, const char *type, int seq,
821 int idx)
822 {
823 struct pmbus_boolean *boolean;
824
825 BUG_ON(data->num_booleans >= data->max_booleans);
826
827 boolean = &data->booleans[data->num_booleans];
828
829 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
830 name, seq, type);
831 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
832 data->num_booleans++;
833 }
834
835 static void pmbus_add_boolean_reg(struct pmbus_data *data,
836 const char *name, const char *type,
837 int seq, int reg, int bit)
838 {
839 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
840 }
841
842 static void pmbus_add_boolean_cmp(struct pmbus_data *data,
843 const char *name, const char *type,
844 int seq, int i1, int i2, int reg, int mask)
845 {
846 pmbus_add_boolean(data, name, type, seq,
847 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
848 }
849
850 static void pmbus_add_sensor(struct pmbus_data *data,
851 const char *name, const char *type, int seq,
852 int page, int reg, enum pmbus_sensor_classes class,
853 bool update, bool readonly)
854 {
855 struct pmbus_sensor *sensor;
856
857 BUG_ON(data->num_sensors >= data->max_sensors);
858
859 sensor = &data->sensors[data->num_sensors];
860 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
861 name, seq, type);
862 sensor->page = page;
863 sensor->reg = reg;
864 sensor->class = class;
865 sensor->update = update;
866 if (readonly)
867 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
868 data->num_sensors);
869 else
870 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
871 data->num_sensors);
872 data->num_sensors++;
873 }
874
875 static void pmbus_add_label(struct pmbus_data *data,
876 const char *name, int seq,
877 const char *lstring, int index)
878 {
879 struct pmbus_label *label;
880
881 BUG_ON(data->num_labels >= data->max_labels);
882
883 label = &data->labels[data->num_labels];
884 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
885 if (!index)
886 strncpy(label->label, lstring, sizeof(label->label) - 1);
887 else
888 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
889 index);
890
891 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
892 data->num_labels++;
893 }
894
895 /*
896 * Determine maximum number of sensors, booleans, and labels.
897 * To keep things simple, only make a rough high estimate.
898 */
899 static void pmbus_find_max_attr(struct i2c_client *client,
900 struct pmbus_data *data)
901 {
902 const struct pmbus_driver_info *info = data->info;
903 int page, max_sensors, max_booleans, max_labels;
904
905 max_sensors = PMBUS_MAX_INPUT_SENSORS;
906 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
907 max_labels = PMBUS_MAX_INPUT_LABELS;
908
909 for (page = 0; page < info->pages; page++) {
910 if (info->func[page] & PMBUS_HAVE_VOUT) {
911 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
912 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
913 max_labels++;
914 }
915 if (info->func[page] & PMBUS_HAVE_IOUT) {
916 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
917 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
918 max_labels++;
919 }
920 if (info->func[page] & PMBUS_HAVE_POUT) {
921 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
922 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
923 max_labels++;
924 }
925 if (info->func[page] & PMBUS_HAVE_FAN12) {
926 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
927 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
928 }
929 if (info->func[page] & PMBUS_HAVE_FAN34) {
930 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
931 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
932 }
933 if (info->func[page] & PMBUS_HAVE_TEMP) {
934 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
935 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
936 }
937 if (info->func[page] & PMBUS_HAVE_TEMP2) {
938 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
939 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
940 }
941 if (info->func[page] & PMBUS_HAVE_TEMP3) {
942 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
943 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
944 }
945 }
946 data->max_sensors = max_sensors;
947 data->max_booleans = max_booleans;
948 data->max_labels = max_labels;
949 data->max_attributes = max_sensors + max_booleans + max_labels;
950 }
951
952 /*
953 * Search for attributes. Allocate sensors, booleans, and labels as needed.
954 */
955
956 /*
957 * The pmbus_limit_attr structure describes a single limit attribute
958 * and its associated alarm attribute.
959 */
960 struct pmbus_limit_attr {
961 u16 reg; /* Limit register */
962 bool update; /* True if register needs updates */
963 const char *attr; /* Attribute name */
964 const char *alarm; /* Alarm attribute name */
965 u32 sbit; /* Alarm attribute status bit */
966 };
967
968 /*
969 * The pmbus_sensor_attr structure describes one sensor attribute. This
970 * description includes a reference to the associated limit attributes.
971 */
972 struct pmbus_sensor_attr {
973 u8 reg; /* sensor register */
974 enum pmbus_sensor_classes class;/* sensor class */
975 const char *label; /* sensor label */
976 bool paged; /* true if paged sensor */
977 bool update; /* true if update needed */
978 bool compare; /* true if compare function needed */
979 u32 func; /* sensor mask */
980 u32 sfunc; /* sensor status mask */
981 int sbase; /* status base register */
982 u32 gbit; /* generic status bit */
983 const struct pmbus_limit_attr *limit;/* limit registers */
984 int nlimit; /* # of limit registers */
985 };
986
987 /*
988 * Add a set of limit attributes and, if supported, the associated
989 * alarm attributes.
990 */
991 static bool pmbus_add_limit_attrs(struct i2c_client *client,
992 struct pmbus_data *data,
993 const struct pmbus_driver_info *info,
994 const char *name, int index, int page,
995 int cbase,
996 const struct pmbus_sensor_attr *attr)
997 {
998 const struct pmbus_limit_attr *l = attr->limit;
999 int nlimit = attr->nlimit;
1000 bool have_alarm = false;
1001 int i, cindex;
1002
1003 for (i = 0; i < nlimit; i++) {
1004 if (pmbus_check_word_register(client, page, l->reg)) {
1005 cindex = data->num_sensors;
1006 pmbus_add_sensor(data, name, l->attr, index, page,
1007 l->reg, attr->class,
1008 attr->update || l->update,
1009 false);
1010 if (l->sbit && (info->func[page] & attr->sfunc)) {
1011 if (attr->compare) {
1012 pmbus_add_boolean_cmp(data, name,
1013 l->alarm, index,
1014 cbase, cindex,
1015 attr->sbase + page, l->sbit);
1016 } else {
1017 pmbus_add_boolean_reg(data, name,
1018 l->alarm, index,
1019 attr->sbase + page, l->sbit);
1020 }
1021 have_alarm = true;
1022 }
1023 }
1024 l++;
1025 }
1026 return have_alarm;
1027 }
1028
1029 static void pmbus_add_sensor_attrs_one(struct i2c_client *client,
1030 struct pmbus_data *data,
1031 const struct pmbus_driver_info *info,
1032 const char *name,
1033 int index, int page,
1034 const struct pmbus_sensor_attr *attr)
1035 {
1036 bool have_alarm;
1037 int cbase = data->num_sensors;
1038
1039 if (attr->label)
1040 pmbus_add_label(data, name, index, attr->label,
1041 attr->paged ? page + 1 : 0);
1042 pmbus_add_sensor(data, name, "input", index, page, attr->reg,
1043 attr->class, true, true);
1044 if (attr->sfunc) {
1045 have_alarm = pmbus_add_limit_attrs(client, data, info, name,
1046 index, page, cbase, attr);
1047 /*
1048 * Add generic alarm attribute only if there are no individual
1049 * alarm attributes, if there is a global alarm bit, and if
1050 * the generic status register for this page is accessible.
1051 */
1052 if (!have_alarm && attr->gbit &&
1053 pmbus_check_byte_register(client, page, PMBUS_STATUS_BYTE))
1054 pmbus_add_boolean_reg(data, name, "alarm", index,
1055 PB_STATUS_BASE + page,
1056 attr->gbit);
1057 }
1058 }
1059
1060 static void pmbus_add_sensor_attrs(struct i2c_client *client,
1061 struct pmbus_data *data,
1062 const char *name,
1063 const struct pmbus_sensor_attr *attrs,
1064 int nattrs)
1065 {
1066 const struct pmbus_driver_info *info = data->info;
1067 int index, i;
1068
1069 index = 1;
1070 for (i = 0; i < nattrs; i++) {
1071 int page, pages;
1072
1073 pages = attrs->paged ? info->pages : 1;
1074 for (page = 0; page < pages; page++) {
1075 if (!(info->func[page] & attrs->func))
1076 continue;
1077 pmbus_add_sensor_attrs_one(client, data, info, name,
1078 index, page, attrs);
1079 index++;
1080 }
1081 attrs++;
1082 }
1083 }
1084
1085 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1086 {
1087 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1088 .attr = "min",
1089 .alarm = "min_alarm",
1090 .sbit = PB_VOLTAGE_UV_WARNING,
1091 }, {
1092 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1093 .attr = "lcrit",
1094 .alarm = "lcrit_alarm",
1095 .sbit = PB_VOLTAGE_UV_FAULT,
1096 }, {
1097 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1098 .attr = "max",
1099 .alarm = "max_alarm",
1100 .sbit = PB_VOLTAGE_OV_WARNING,
1101 }, {
1102 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1103 .attr = "crit",
1104 .alarm = "crit_alarm",
1105 .sbit = PB_VOLTAGE_OV_FAULT,
1106 }, {
1107 .reg = PMBUS_VIRT_READ_VIN_AVG,
1108 .update = true,
1109 .attr = "average",
1110 }, {
1111 .reg = PMBUS_VIRT_READ_VIN_MIN,
1112 .update = true,
1113 .attr = "lowest",
1114 }, {
1115 .reg = PMBUS_VIRT_READ_VIN_MAX,
1116 .update = true,
1117 .attr = "highest",
1118 }, {
1119 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1120 .attr = "reset_history",
1121 },
1122 };
1123
1124 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1125 {
1126 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1127 .attr = "min",
1128 .alarm = "min_alarm",
1129 .sbit = PB_VOLTAGE_UV_WARNING,
1130 }, {
1131 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1132 .attr = "lcrit",
1133 .alarm = "lcrit_alarm",
1134 .sbit = PB_VOLTAGE_UV_FAULT,
1135 }, {
1136 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1137 .attr = "max",
1138 .alarm = "max_alarm",
1139 .sbit = PB_VOLTAGE_OV_WARNING,
1140 }, {
1141 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1142 .attr = "crit",
1143 .alarm = "crit_alarm",
1144 .sbit = PB_VOLTAGE_OV_FAULT,
1145 }, {
1146 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1147 .update = true,
1148 .attr = "average",
1149 }, {
1150 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1151 .update = true,
1152 .attr = "lowest",
1153 }, {
1154 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1155 .update = true,
1156 .attr = "highest",
1157 }, {
1158 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1159 .attr = "reset_history",
1160 }
1161 };
1162
1163 static const struct pmbus_sensor_attr voltage_attributes[] = {
1164 {
1165 .reg = PMBUS_READ_VIN,
1166 .class = PSC_VOLTAGE_IN,
1167 .label = "vin",
1168 .func = PMBUS_HAVE_VIN,
1169 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1170 .sbase = PB_STATUS_INPUT_BASE,
1171 .gbit = PB_STATUS_VIN_UV,
1172 .limit = vin_limit_attrs,
1173 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1174 }, {
1175 .reg = PMBUS_READ_VCAP,
1176 .class = PSC_VOLTAGE_IN,
1177 .label = "vcap",
1178 .func = PMBUS_HAVE_VCAP,
1179 }, {
1180 .reg = PMBUS_READ_VOUT,
1181 .class = PSC_VOLTAGE_OUT,
1182 .label = "vout",
1183 .paged = true,
1184 .func = PMBUS_HAVE_VOUT,
1185 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1186 .sbase = PB_STATUS_VOUT_BASE,
1187 .gbit = PB_STATUS_VOUT_OV,
1188 .limit = vout_limit_attrs,
1189 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1190 }
1191 };
1192
1193 /* Current attributes */
1194
1195 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1196 {
1197 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1198 .attr = "max",
1199 .alarm = "max_alarm",
1200 .sbit = PB_IIN_OC_WARNING,
1201 }, {
1202 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1203 .attr = "crit",
1204 .alarm = "crit_alarm",
1205 .sbit = PB_IIN_OC_FAULT,
1206 }, {
1207 .reg = PMBUS_VIRT_READ_IIN_AVG,
1208 .update = true,
1209 .attr = "average",
1210 }, {
1211 .reg = PMBUS_VIRT_READ_IIN_MIN,
1212 .update = true,
1213 .attr = "lowest",
1214 }, {
1215 .reg = PMBUS_VIRT_READ_IIN_MAX,
1216 .update = true,
1217 .attr = "highest",
1218 }, {
1219 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1220 .attr = "reset_history",
1221 }
1222 };
1223
1224 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1225 {
1226 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1227 .attr = "max",
1228 .alarm = "max_alarm",
1229 .sbit = PB_IOUT_OC_WARNING,
1230 }, {
1231 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1232 .attr = "lcrit",
1233 .alarm = "lcrit_alarm",
1234 .sbit = PB_IOUT_UC_FAULT,
1235 }, {
1236 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1237 .attr = "crit",
1238 .alarm = "crit_alarm",
1239 .sbit = PB_IOUT_OC_FAULT,
1240 }, {
1241 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1242 .update = true,
1243 .attr = "average",
1244 }, {
1245 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1246 .update = true,
1247 .attr = "lowest",
1248 }, {
1249 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1250 .update = true,
1251 .attr = "highest",
1252 }, {
1253 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1254 .attr = "reset_history",
1255 }
1256 };
1257
1258 static const struct pmbus_sensor_attr current_attributes[] = {
1259 {
1260 .reg = PMBUS_READ_IIN,
1261 .class = PSC_CURRENT_IN,
1262 .label = "iin",
1263 .func = PMBUS_HAVE_IIN,
1264 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1265 .sbase = PB_STATUS_INPUT_BASE,
1266 .limit = iin_limit_attrs,
1267 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1268 }, {
1269 .reg = PMBUS_READ_IOUT,
1270 .class = PSC_CURRENT_OUT,
1271 .label = "iout",
1272 .paged = true,
1273 .func = PMBUS_HAVE_IOUT,
1274 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1275 .sbase = PB_STATUS_IOUT_BASE,
1276 .gbit = PB_STATUS_IOUT_OC,
1277 .limit = iout_limit_attrs,
1278 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1279 }
1280 };
1281
1282 /* Power attributes */
1283
1284 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1285 {
1286 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1287 .attr = "max",
1288 .alarm = "alarm",
1289 .sbit = PB_PIN_OP_WARNING,
1290 }, {
1291 .reg = PMBUS_VIRT_READ_PIN_AVG,
1292 .update = true,
1293 .attr = "average",
1294 }, {
1295 .reg = PMBUS_VIRT_READ_PIN_MAX,
1296 .update = true,
1297 .attr = "input_highest",
1298 }, {
1299 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1300 .attr = "reset_history",
1301 }
1302 };
1303
1304 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1305 {
1306 .reg = PMBUS_POUT_MAX,
1307 .attr = "cap",
1308 .alarm = "cap_alarm",
1309 .sbit = PB_POWER_LIMITING,
1310 }, {
1311 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1312 .attr = "max",
1313 .alarm = "max_alarm",
1314 .sbit = PB_POUT_OP_WARNING,
1315 }, {
1316 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1317 .attr = "crit",
1318 .alarm = "crit_alarm",
1319 .sbit = PB_POUT_OP_FAULT,
1320 }
1321 };
1322
1323 static const struct pmbus_sensor_attr power_attributes[] = {
1324 {
1325 .reg = PMBUS_READ_PIN,
1326 .class = PSC_POWER,
1327 .label = "pin",
1328 .func = PMBUS_HAVE_PIN,
1329 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1330 .sbase = PB_STATUS_INPUT_BASE,
1331 .limit = pin_limit_attrs,
1332 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1333 }, {
1334 .reg = PMBUS_READ_POUT,
1335 .class = PSC_POWER,
1336 .label = "pout",
1337 .paged = true,
1338 .func = PMBUS_HAVE_POUT,
1339 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1340 .sbase = PB_STATUS_IOUT_BASE,
1341 .limit = pout_limit_attrs,
1342 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1343 }
1344 };
1345
1346 /* Temperature atributes */
1347
1348 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1349 {
1350 .reg = PMBUS_UT_WARN_LIMIT,
1351 .attr = "min",
1352 .alarm = "min_alarm",
1353 .sbit = PB_TEMP_UT_WARNING,
1354 }, {
1355 .reg = PMBUS_UT_FAULT_LIMIT,
1356 .attr = "lcrit",
1357 .alarm = "lcrit_alarm",
1358 .sbit = PB_TEMP_UT_FAULT,
1359 }, {
1360 .reg = PMBUS_OT_WARN_LIMIT,
1361 .attr = "max",
1362 .alarm = "max_alarm",
1363 .sbit = PB_TEMP_OT_WARNING,
1364 }, {
1365 .reg = PMBUS_OT_FAULT_LIMIT,
1366 .attr = "crit",
1367 .alarm = "crit_alarm",
1368 .sbit = PB_TEMP_OT_FAULT,
1369 }, {
1370 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1371 .attr = "lowest",
1372 }, {
1373 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1374 .attr = "highest",
1375 }, {
1376 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1377 .attr = "reset_history",
1378 }
1379 };
1380
1381 static const struct pmbus_limit_attr temp_limit_attrs23[] = {
1382 {
1383 .reg = PMBUS_UT_WARN_LIMIT,
1384 .attr = "min",
1385 .alarm = "min_alarm",
1386 .sbit = PB_TEMP_UT_WARNING,
1387 }, {
1388 .reg = PMBUS_UT_FAULT_LIMIT,
1389 .attr = "lcrit",
1390 .alarm = "lcrit_alarm",
1391 .sbit = PB_TEMP_UT_FAULT,
1392 }, {
1393 .reg = PMBUS_OT_WARN_LIMIT,
1394 .attr = "max",
1395 .alarm = "max_alarm",
1396 .sbit = PB_TEMP_OT_WARNING,
1397 }, {
1398 .reg = PMBUS_OT_FAULT_LIMIT,
1399 .attr = "crit",
1400 .alarm = "crit_alarm",
1401 .sbit = PB_TEMP_OT_FAULT,
1402 }
1403 };
1404
1405 static const struct pmbus_sensor_attr temp_attributes[] = {
1406 {
1407 .reg = PMBUS_READ_TEMPERATURE_1,
1408 .class = PSC_TEMPERATURE,
1409 .paged = true,
1410 .update = true,
1411 .compare = true,
1412 .func = PMBUS_HAVE_TEMP,
1413 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1414 .sbase = PB_STATUS_TEMP_BASE,
1415 .gbit = PB_STATUS_TEMPERATURE,
1416 .limit = temp_limit_attrs,
1417 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1418 }, {
1419 .reg = PMBUS_READ_TEMPERATURE_2,
1420 .class = PSC_TEMPERATURE,
1421 .paged = true,
1422 .update = true,
1423 .compare = true,
1424 .func = PMBUS_HAVE_TEMP2,
1425 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1426 .sbase = PB_STATUS_TEMP_BASE,
1427 .gbit = PB_STATUS_TEMPERATURE,
1428 .limit = temp_limit_attrs23,
1429 .nlimit = ARRAY_SIZE(temp_limit_attrs23),
1430 }, {
1431 .reg = PMBUS_READ_TEMPERATURE_3,
1432 .class = PSC_TEMPERATURE,
1433 .paged = true,
1434 .update = true,
1435 .compare = true,
1436 .func = PMBUS_HAVE_TEMP3,
1437 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1438 .sbase = PB_STATUS_TEMP_BASE,
1439 .gbit = PB_STATUS_TEMPERATURE,
1440 .limit = temp_limit_attrs23,
1441 .nlimit = ARRAY_SIZE(temp_limit_attrs23),
1442 }
1443 };
1444
1445 static const int pmbus_fan_registers[] = {
1446 PMBUS_READ_FAN_SPEED_1,
1447 PMBUS_READ_FAN_SPEED_2,
1448 PMBUS_READ_FAN_SPEED_3,
1449 PMBUS_READ_FAN_SPEED_4
1450 };
1451
1452 static const int pmbus_fan_config_registers[] = {
1453 PMBUS_FAN_CONFIG_12,
1454 PMBUS_FAN_CONFIG_12,
1455 PMBUS_FAN_CONFIG_34,
1456 PMBUS_FAN_CONFIG_34
1457 };
1458
1459 static const int pmbus_fan_status_registers[] = {
1460 PMBUS_STATUS_FAN_12,
1461 PMBUS_STATUS_FAN_12,
1462 PMBUS_STATUS_FAN_34,
1463 PMBUS_STATUS_FAN_34
1464 };
1465
1466 static const u32 pmbus_fan_flags[] = {
1467 PMBUS_HAVE_FAN12,
1468 PMBUS_HAVE_FAN12,
1469 PMBUS_HAVE_FAN34,
1470 PMBUS_HAVE_FAN34
1471 };
1472
1473 static const u32 pmbus_fan_status_flags[] = {
1474 PMBUS_HAVE_STATUS_FAN12,
1475 PMBUS_HAVE_STATUS_FAN12,
1476 PMBUS_HAVE_STATUS_FAN34,
1477 PMBUS_HAVE_STATUS_FAN34
1478 };
1479
1480 /* Fans */
1481 static void pmbus_add_fan_attributes(struct i2c_client *client,
1482 struct pmbus_data *data)
1483 {
1484 const struct pmbus_driver_info *info = data->info;
1485 int index = 1;
1486 int page;
1487
1488 for (page = 0; page < info->pages; page++) {
1489 int f;
1490
1491 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1492 int regval;
1493
1494 if (!(info->func[page] & pmbus_fan_flags[f]))
1495 break;
1496
1497 if (!pmbus_check_word_register(client, page,
1498 pmbus_fan_registers[f]))
1499 break;
1500
1501 /*
1502 * Skip fan if not installed.
1503 * Each fan configuration register covers multiple fans,
1504 * so we have to do some magic.
1505 */
1506 regval = _pmbus_read_byte_data(client, page,
1507 pmbus_fan_config_registers[f]);
1508 if (regval < 0 ||
1509 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1510 continue;
1511
1512 pmbus_add_sensor(data, "fan", "input", index, page,
1513 pmbus_fan_registers[f], PSC_FAN, true,
1514 true);
1515
1516 /*
1517 * Each fan status register covers multiple fans,
1518 * so we have to do some magic.
1519 */
1520 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1521 pmbus_check_byte_register(client,
1522 page, pmbus_fan_status_registers[f])) {
1523 int base;
1524
1525 if (f > 1) /* fan 3, 4 */
1526 base = PB_STATUS_FAN34_BASE + page;
1527 else
1528 base = PB_STATUS_FAN_BASE + page;
1529 pmbus_add_boolean_reg(data, "fan", "alarm",
1530 index, base,
1531 PB_FAN_FAN1_WARNING >> (f & 1));
1532 pmbus_add_boolean_reg(data, "fan", "fault",
1533 index, base,
1534 PB_FAN_FAN1_FAULT >> (f & 1));
1535 }
1536 index++;
1537 }
1538 }
1539 }
1540
1541 static void pmbus_find_attributes(struct i2c_client *client,
1542 struct pmbus_data *data)
1543 {
1544 /* Voltage sensors */
1545 pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1546 ARRAY_SIZE(voltage_attributes));
1547
1548 /* Current sensors */
1549 pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1550 ARRAY_SIZE(current_attributes));
1551
1552 /* Power sensors */
1553 pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1554 ARRAY_SIZE(power_attributes));
1555
1556 /* Temperature sensors */
1557 pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1558 ARRAY_SIZE(temp_attributes));
1559
1560 /* Fans */
1561 pmbus_add_fan_attributes(client, data);
1562 }
1563
1564 /*
1565 * Identify chip parameters.
1566 * This function is called for all chips.
1567 */
1568 static int pmbus_identify_common(struct i2c_client *client,
1569 struct pmbus_data *data)
1570 {
1571 int vout_mode = -1, exponent;
1572
1573 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1574 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1575 if (vout_mode >= 0 && vout_mode != 0xff) {
1576 /*
1577 * Not all chips support the VOUT_MODE command,
1578 * so a failure to read it is not an error.
1579 */
1580 switch (vout_mode >> 5) {
1581 case 0: /* linear mode */
1582 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1583 return -ENODEV;
1584
1585 exponent = vout_mode & 0x1f;
1586 /* and sign-extend it */
1587 if (exponent & 0x10)
1588 exponent |= ~0x1f;
1589 data->exponent = exponent;
1590 break;
1591 case 1: /* VID mode */
1592 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1593 return -ENODEV;
1594 break;
1595 case 2: /* direct mode */
1596 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1597 return -ENODEV;
1598 break;
1599 default:
1600 return -ENODEV;
1601 }
1602 }
1603
1604 /* Determine maximum number of sensors, booleans, and labels */
1605 pmbus_find_max_attr(client, data);
1606 pmbus_clear_fault_page(client, 0);
1607 return 0;
1608 }
1609
1610 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1611 struct pmbus_driver_info *info)
1612 {
1613 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1614 struct pmbus_data *data;
1615 int ret;
1616
1617 if (!info) {
1618 dev_err(&client->dev, "Missing chip information");
1619 return -ENODEV;
1620 }
1621
1622 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1623 | I2C_FUNC_SMBUS_BYTE_DATA
1624 | I2C_FUNC_SMBUS_WORD_DATA))
1625 return -ENODEV;
1626
1627 data = kzalloc(sizeof(*data), GFP_KERNEL);
1628 if (!data) {
1629 dev_err(&client->dev, "No memory to allocate driver data\n");
1630 return -ENOMEM;
1631 }
1632
1633 i2c_set_clientdata(client, data);
1634 mutex_init(&data->update_lock);
1635
1636 /* Bail out if PMBus status register does not exist. */
1637 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
1638 dev_err(&client->dev, "PMBus status register not found\n");
1639 ret = -ENODEV;
1640 goto out_data;
1641 }
1642
1643 if (pdata)
1644 data->flags = pdata->flags;
1645 data->info = info;
1646
1647 pmbus_clear_faults(client);
1648
1649 if (info->identify) {
1650 ret = (*info->identify)(client, info);
1651 if (ret < 0) {
1652 dev_err(&client->dev, "Chip identification failed\n");
1653 goto out_data;
1654 }
1655 }
1656
1657 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1658 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1659 info->pages);
1660 ret = -EINVAL;
1661 goto out_data;
1662 }
1663
1664 ret = pmbus_identify_common(client, data);
1665 if (ret < 0) {
1666 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1667 goto out_data;
1668 }
1669
1670 ret = -ENOMEM;
1671 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1672 GFP_KERNEL);
1673 if (!data->sensors) {
1674 dev_err(&client->dev, "No memory to allocate sensor data\n");
1675 goto out_data;
1676 }
1677
1678 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1679 * data->max_booleans, GFP_KERNEL);
1680 if (!data->booleans) {
1681 dev_err(&client->dev, "No memory to allocate boolean data\n");
1682 goto out_sensors;
1683 }
1684
1685 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1686 GFP_KERNEL);
1687 if (!data->labels) {
1688 dev_err(&client->dev, "No memory to allocate label data\n");
1689 goto out_booleans;
1690 }
1691
1692 data->attributes = kzalloc(sizeof(struct attribute *)
1693 * data->max_attributes, GFP_KERNEL);
1694 if (!data->attributes) {
1695 dev_err(&client->dev, "No memory to allocate attribute data\n");
1696 goto out_labels;
1697 }
1698
1699 pmbus_find_attributes(client, data);
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(&client->dev, "No attributes found\n");
1707 ret = -ENODEV;
1708 goto out_attributes;
1709 }
1710
1711 /* Register sysfs hooks */
1712 data->group.attrs = data->attributes;
1713 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1714 if (ret) {
1715 dev_err(&client->dev, "Failed to create sysfs entries\n");
1716 goto out_attributes;
1717 }
1718 data->hwmon_dev = hwmon_device_register(&client->dev);
1719 if (IS_ERR(data->hwmon_dev)) {
1720 ret = PTR_ERR(data->hwmon_dev);
1721 dev_err(&client->dev, "Failed to register hwmon device\n");
1722 goto out_hwmon_device_register;
1723 }
1724 return 0;
1725
1726 out_hwmon_device_register:
1727 sysfs_remove_group(&client->dev.kobj, &data->group);
1728 out_attributes:
1729 kfree(data->attributes);
1730 out_labels:
1731 kfree(data->labels);
1732 out_booleans:
1733 kfree(data->booleans);
1734 out_sensors:
1735 kfree(data->sensors);
1736 out_data:
1737 kfree(data);
1738 return ret;
1739 }
1740 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1741
1742 int pmbus_do_remove(struct i2c_client *client)
1743 {
1744 struct pmbus_data *data = i2c_get_clientdata(client);
1745 hwmon_device_unregister(data->hwmon_dev);
1746 sysfs_remove_group(&client->dev.kobj, &data->group);
1747 kfree(data->attributes);
1748 kfree(data->labels);
1749 kfree(data->booleans);
1750 kfree(data->sensors);
1751 kfree(data);
1752 return 0;
1753 }
1754 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1755
1756 MODULE_AUTHOR("Guenter Roeck");
1757 MODULE_DESCRIPTION("PMBus core driver");
1758 MODULE_LICENSE("GPL");