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hwmon: (pmbus) Add support for peak attributes
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / pmbus / pmbus_core.c
blob9baf119b64dbb1cd6a643a01e42393d584dc71fe
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 static 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
184 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
185 {
186 int rv;
187
188 rv = pmbus_set_page(client, page);
189 if (rv < 0)
190 return rv;
191
192 return i2c_smbus_write_word_data(client, reg, word);
193 }
194 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
195
196 /*
197 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
198 * a device specific mapping function exists and calls it if necessary.
199 */
200 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
201 u16 word)
202 {
203 struct pmbus_data *data = i2c_get_clientdata(client);
204 const struct pmbus_driver_info *info = data->info;
205 int status;
206
207 if (info->write_word_data) {
208 status = info->write_word_data(client, page, reg, word);
209 if (status != -ENODATA)
210 return status;
211 }
212 if (reg >= PMBUS_VIRT_BASE)
213 return -EINVAL;
214 return pmbus_write_word_data(client, page, reg, word);
215 }
216
217 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
218 {
219 int rv;
220
221 rv = pmbus_set_page(client, page);
222 if (rv < 0)
223 return rv;
224
225 return i2c_smbus_read_word_data(client, reg);
226 }
227 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
228
229 /*
230 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
231 * a device specific mapping function exists and calls it if necessary.
232 */
233 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
234 {
235 struct pmbus_data *data = i2c_get_clientdata(client);
236 const struct pmbus_driver_info *info = data->info;
237 int status;
238
239 if (info->read_word_data) {
240 status = info->read_word_data(client, page, reg);
241 if (status != -ENODATA)
242 return status;
243 }
244 if (reg >= PMBUS_VIRT_BASE)
245 return -EINVAL;
246 return pmbus_read_word_data(client, page, reg);
247 }
248
249 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
250 {
251 int rv;
252
253 if (page >= 0) {
254 rv = pmbus_set_page(client, page);
255 if (rv < 0)
256 return rv;
257 }
258
259 return i2c_smbus_read_byte_data(client, reg);
260 }
261 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
262
263 /*
264 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
265 * a device specific mapping function exists and calls it if necessary.
266 */
267 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
268 {
269 struct pmbus_data *data = i2c_get_clientdata(client);
270 const struct pmbus_driver_info *info = data->info;
271 int status;
272
273 if (info->read_byte_data) {
274 status = info->read_byte_data(client, page, reg);
275 if (status != -ENODATA)
276 return status;
277 }
278 return pmbus_read_byte_data(client, page, reg);
279 }
280
281 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
282 {
283 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
284 }
285
286 void pmbus_clear_faults(struct i2c_client *client)
287 {
288 struct pmbus_data *data = i2c_get_clientdata(client);
289 int i;
290
291 for (i = 0; i < data->info->pages; i++)
292 pmbus_clear_fault_page(client, i);
293 }
294 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
295
296 static int pmbus_check_status_cml(struct i2c_client *client)
297 {
298 int status, status2;
299
300 status = pmbus_read_byte_data(client, -1, PMBUS_STATUS_BYTE);
301 if (status < 0 || (status & PB_STATUS_CML)) {
302 status2 = pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
303 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
304 return -EINVAL;
305 }
306 return 0;
307 }
308
309 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
310 {
311 int rv;
312 struct pmbus_data *data = i2c_get_clientdata(client);
313
314 rv = _pmbus_read_byte_data(client, page, reg);
315 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
316 rv = pmbus_check_status_cml(client);
317 pmbus_clear_fault_page(client, -1);
318 return rv >= 0;
319 }
320 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
321
322 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
323 {
324 int rv;
325 struct pmbus_data *data = i2c_get_clientdata(client);
326
327 rv = _pmbus_read_word_data(client, page, reg);
328 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
329 rv = pmbus_check_status_cml(client);
330 pmbus_clear_fault_page(client, -1);
331 return rv >= 0;
332 }
333 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
334
335 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
336 {
337 struct pmbus_data *data = i2c_get_clientdata(client);
338
339 return data->info;
340 }
341 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
342
343 static struct pmbus_data *pmbus_update_device(struct device *dev)
344 {
345 struct i2c_client *client = to_i2c_client(dev);
346 struct pmbus_data *data = i2c_get_clientdata(client);
347 const struct pmbus_driver_info *info = data->info;
348
349 mutex_lock(&data->update_lock);
350 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
351 int i;
352
353 for (i = 0; i < info->pages; i++)
354 data->status[PB_STATUS_BASE + i]
355 = pmbus_read_byte_data(client, i,
356 PMBUS_STATUS_BYTE);
357 for (i = 0; i < info->pages; i++) {
358 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
359 continue;
360 data->status[PB_STATUS_VOUT_BASE + i]
361 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT);
362 }
363 for (i = 0; i < info->pages; i++) {
364 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
365 continue;
366 data->status[PB_STATUS_IOUT_BASE + i]
367 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT);
368 }
369 for (i = 0; i < info->pages; i++) {
370 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
371 continue;
372 data->status[PB_STATUS_TEMP_BASE + i]
373 = _pmbus_read_byte_data(client, i,
374 PMBUS_STATUS_TEMPERATURE);
375 }
376 for (i = 0; i < info->pages; i++) {
377 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
378 continue;
379 data->status[PB_STATUS_FAN_BASE + i]
380 = _pmbus_read_byte_data(client, i,
381 PMBUS_STATUS_FAN_12);
382 }
383
384 for (i = 0; i < info->pages; i++) {
385 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
386 continue;
387 data->status[PB_STATUS_FAN34_BASE + i]
388 = _pmbus_read_byte_data(client, i,
389 PMBUS_STATUS_FAN_34);
390 }
391
392 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
393 data->status[PB_STATUS_INPUT_BASE]
394 = _pmbus_read_byte_data(client, 0,
395 PMBUS_STATUS_INPUT);
396
397 for (i = 0; i < data->num_sensors; i++) {
398 struct pmbus_sensor *sensor = &data->sensors[i];
399
400 if (!data->valid || sensor->update)
401 sensor->data
402 = _pmbus_read_word_data(client,
403 sensor->page,
404 sensor->reg);
405 }
406 pmbus_clear_faults(client);
407 data->last_updated = jiffies;
408 data->valid = 1;
409 }
410 mutex_unlock(&data->update_lock);
411 return data;
412 }
413
414 /*
415 * Convert linear sensor values to milli- or micro-units
416 * depending on sensor type.
417 */
418 static long pmbus_reg2data_linear(struct pmbus_data *data,
419 struct pmbus_sensor *sensor)
420 {
421 s16 exponent;
422 s32 mantissa;
423 long val;
424
425 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
426 exponent = data->exponent;
427 mantissa = (u16) sensor->data;
428 } else { /* LINEAR11 */
429 exponent = (sensor->data >> 11) & 0x001f;
430 mantissa = sensor->data & 0x07ff;
431
432 if (exponent > 0x0f)
433 exponent |= 0xffe0; /* sign extend exponent */
434 if (mantissa > 0x03ff)
435 mantissa |= 0xfffff800; /* sign extend mantissa */
436 }
437
438 val = mantissa;
439
440 /* scale result to milli-units for all sensors except fans */
441 if (sensor->class != PSC_FAN)
442 val = val * 1000L;
443
444 /* scale result to micro-units for power sensors */
445 if (sensor->class == PSC_POWER)
446 val = val * 1000L;
447
448 if (exponent >= 0)
449 val <<= exponent;
450 else
451 val >>= -exponent;
452
453 return val;
454 }
455
456 /*
457 * Convert direct sensor values to milli- or micro-units
458 * depending on sensor type.
459 */
460 static long pmbus_reg2data_direct(struct pmbus_data *data,
461 struct pmbus_sensor *sensor)
462 {
463 long val = (s16) sensor->data;
464 long m, b, R;
465
466 m = data->info->m[sensor->class];
467 b = data->info->b[sensor->class];
468 R = data->info->R[sensor->class];
469
470 if (m == 0)
471 return 0;
472
473 /* X = 1/m * (Y * 10^-R - b) */
474 R = -R;
475 /* scale result to milli-units for everything but fans */
476 if (sensor->class != PSC_FAN) {
477 R += 3;
478 b *= 1000;
479 }
480
481 /* scale result to micro-units for power sensors */
482 if (sensor->class == PSC_POWER) {
483 R += 3;
484 b *= 1000;
485 }
486
487 while (R > 0) {
488 val *= 10;
489 R--;
490 }
491 while (R < 0) {
492 val = DIV_ROUND_CLOSEST(val, 10);
493 R++;
494 }
495
496 return (val - b) / m;
497 }
498
499 /*
500 * Convert VID sensor values to milli- or micro-units
501 * depending on sensor type.
502 * We currently only support VR11.
503 */
504 static long pmbus_reg2data_vid(struct pmbus_data *data,
505 struct pmbus_sensor *sensor)
506 {
507 long val = sensor->data;
508
509 if (val < 0x02 || val > 0xb2)
510 return 0;
511 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
512 }
513
514 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
515 {
516 long val;
517
518 switch (data->info->format[sensor->class]) {
519 case direct:
520 val = pmbus_reg2data_direct(data, sensor);
521 break;
522 case vid:
523 val = pmbus_reg2data_vid(data, sensor);
524 break;
525 case linear:
526 default:
527 val = pmbus_reg2data_linear(data, sensor);
528 break;
529 }
530 return val;
531 }
532
533 #define MAX_MANTISSA (1023 * 1000)
534 #define MIN_MANTISSA (511 * 1000)
535
536 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
537 enum pmbus_sensor_classes class, long val)
538 {
539 s16 exponent = 0, mantissa;
540 bool negative = false;
541
542 /* simple case */
543 if (val == 0)
544 return 0;
545
546 if (class == PSC_VOLTAGE_OUT) {
547 /* LINEAR16 does not support negative voltages */
548 if (val < 0)
549 return 0;
550
551 /*
552 * For a static exponents, we don't have a choice
553 * but to adjust the value to it.
554 */
555 if (data->exponent < 0)
556 val <<= -data->exponent;
557 else
558 val >>= data->exponent;
559 val = DIV_ROUND_CLOSEST(val, 1000);
560 return val & 0xffff;
561 }
562
563 if (val < 0) {
564 negative = true;
565 val = -val;
566 }
567
568 /* Power is in uW. Convert to mW before converting. */
569 if (class == PSC_POWER)
570 val = DIV_ROUND_CLOSEST(val, 1000L);
571
572 /*
573 * For simplicity, convert fan data to milli-units
574 * before calculating the exponent.
575 */
576 if (class == PSC_FAN)
577 val = val * 1000;
578
579 /* Reduce large mantissa until it fits into 10 bit */
580 while (val >= MAX_MANTISSA && exponent < 15) {
581 exponent++;
582 val >>= 1;
583 }
584 /* Increase small mantissa to improve precision */
585 while (val < MIN_MANTISSA && exponent > -15) {
586 exponent--;
587 val <<= 1;
588 }
589
590 /* Convert mantissa from milli-units to units */
591 mantissa = DIV_ROUND_CLOSEST(val, 1000);
592
593 /* Ensure that resulting number is within range */
594 if (mantissa > 0x3ff)
595 mantissa = 0x3ff;
596
597 /* restore sign */
598 if (negative)
599 mantissa = -mantissa;
600
601 /* Convert to 5 bit exponent, 11 bit mantissa */
602 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
603 }
604
605 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
606 enum pmbus_sensor_classes class, long val)
607 {
608 long m, b, R;
609
610 m = data->info->m[class];
611 b = data->info->b[class];
612 R = data->info->R[class];
613
614 /* Power is in uW. Adjust R and b. */
615 if (class == PSC_POWER) {
616 R -= 3;
617 b *= 1000;
618 }
619
620 /* Calculate Y = (m * X + b) * 10^R */
621 if (class != PSC_FAN) {
622 R -= 3; /* Adjust R and b for data in milli-units */
623 b *= 1000;
624 }
625 val = val * m + b;
626
627 while (R > 0) {
628 val *= 10;
629 R--;
630 }
631 while (R < 0) {
632 val = DIV_ROUND_CLOSEST(val, 10);
633 R++;
634 }
635
636 return val;
637 }
638
639 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
640 enum pmbus_sensor_classes class, long val)
641 {
642 val = SENSORS_LIMIT(val, 500, 1600);
643
644 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
645 }
646
647 static u16 pmbus_data2reg(struct pmbus_data *data,
648 enum pmbus_sensor_classes class, long val)
649 {
650 u16 regval;
651
652 switch (data->info->format[class]) {
653 case direct:
654 regval = pmbus_data2reg_direct(data, class, val);
655 break;
656 case vid:
657 regval = pmbus_data2reg_vid(data, class, val);
658 break;
659 case linear:
660 default:
661 regval = pmbus_data2reg_linear(data, class, val);
662 break;
663 }
664 return regval;
665 }
666
667 /*
668 * Return boolean calculated from converted data.
669 * <index> defines a status register index and mask, and optionally
670 * two sensor indexes.
671 * The upper half-word references the two sensors,
672 * two sensor indices.
673 * The upper half-word references the two optional sensors,
674 * the lower half word references status register and mask.
675 * The function returns true if (status[reg] & mask) is true and,
676 * if specified, if v1 >= v2.
677 * To determine if an object exceeds upper limits, specify <v, limit>.
678 * To determine if an object exceeds lower limits, specify <limit, v>.
679 *
680 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
681 * index are set. s1 and s2 (the sensor index values) are zero in this case.
682 * The function returns true if (status[reg] & mask) is true.
683 *
684 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
685 * a specified limit has to be performed to determine the boolean result.
686 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
687 * sensor values referenced by sensor indices s1 and s2).
688 *
689 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
690 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
691 *
692 * If a negative value is stored in any of the referenced registers, this value
693 * reflects an error code which will be returned.
694 */
695 static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
696 {
697 u8 s1 = (index >> 24) & 0xff;
698 u8 s2 = (index >> 16) & 0xff;
699 u8 reg = (index >> 8) & 0xff;
700 u8 mask = index & 0xff;
701 int status;
702 u8 regval;
703
704 status = data->status[reg];
705 if (status < 0)
706 return status;
707
708 regval = status & mask;
709 if (!s1 && !s2)
710 *val = !!regval;
711 else {
712 long v1, v2;
713 struct pmbus_sensor *sensor1, *sensor2;
714
715 sensor1 = &data->sensors[s1];
716 if (sensor1->data < 0)
717 return sensor1->data;
718 sensor2 = &data->sensors[s2];
719 if (sensor2->data < 0)
720 return sensor2->data;
721
722 v1 = pmbus_reg2data(data, sensor1);
723 v2 = pmbus_reg2data(data, sensor2);
724 *val = !!(regval && v1 >= v2);
725 }
726 return 0;
727 }
728
729 static ssize_t pmbus_show_boolean(struct device *dev,
730 struct device_attribute *da, char *buf)
731 {
732 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
733 struct pmbus_data *data = pmbus_update_device(dev);
734 int val;
735 int err;
736
737 err = pmbus_get_boolean(data, attr->index, &val);
738 if (err)
739 return err;
740 return snprintf(buf, PAGE_SIZE, "%d\n", val);
741 }
742
743 static ssize_t pmbus_show_sensor(struct device *dev,
744 struct device_attribute *da, char *buf)
745 {
746 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
747 struct pmbus_data *data = pmbus_update_device(dev);
748 struct pmbus_sensor *sensor;
749
750 sensor = &data->sensors[attr->index];
751 if (sensor->data < 0)
752 return sensor->data;
753
754 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
755 }
756
757 static ssize_t pmbus_set_sensor(struct device *dev,
758 struct device_attribute *devattr,
759 const char *buf, size_t count)
760 {
761 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
762 struct i2c_client *client = to_i2c_client(dev);
763 struct pmbus_data *data = i2c_get_clientdata(client);
764 struct pmbus_sensor *sensor = &data->sensors[attr->index];
765 ssize_t rv = count;
766 long val = 0;
767 int ret;
768 u16 regval;
769
770 if (strict_strtol(buf, 10, &val) < 0)
771 return -EINVAL;
772
773 mutex_lock(&data->update_lock);
774 regval = pmbus_data2reg(data, sensor->class, val);
775 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
776 if (ret < 0)
777 rv = ret;
778 else
779 data->sensors[attr->index].data = regval;
780 mutex_unlock(&data->update_lock);
781 return rv;
782 }
783
784 static ssize_t pmbus_show_label(struct device *dev,
785 struct device_attribute *da, char *buf)
786 {
787 struct i2c_client *client = to_i2c_client(dev);
788 struct pmbus_data *data = i2c_get_clientdata(client);
789 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
790
791 return snprintf(buf, PAGE_SIZE, "%s\n",
792 data->labels[attr->index].label);
793 }
794
795 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
796 do { \
797 struct sensor_device_attribute *a \
798 = &data->_type##s[data->num_##_type##s].attribute; \
799 BUG_ON(data->num_attributes >= data->max_attributes); \
800 sysfs_attr_init(&a->dev_attr.attr); \
801 a->dev_attr.attr.name = _name; \
802 a->dev_attr.attr.mode = _mode; \
803 a->dev_attr.show = _show; \
804 a->dev_attr.store = _set; \
805 a->index = _idx; \
806 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
807 data->num_attributes++; \
808 } while (0)
809
810 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
811 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
812 pmbus_show_##_type, NULL)
813
814 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
815 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
816 pmbus_show_##_type, pmbus_set_##_type)
817
818 static void pmbus_add_boolean(struct pmbus_data *data,
819 const char *name, const char *type, int seq,
820 int idx)
821 {
822 struct pmbus_boolean *boolean;
823
824 BUG_ON(data->num_booleans >= data->max_booleans);
825
826 boolean = &data->booleans[data->num_booleans];
827
828 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
829 name, seq, type);
830 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
831 data->num_booleans++;
832 }
833
834 static void pmbus_add_boolean_reg(struct pmbus_data *data,
835 const char *name, const char *type,
836 int seq, int reg, int bit)
837 {
838 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
839 }
840
841 static void pmbus_add_boolean_cmp(struct pmbus_data *data,
842 const char *name, const char *type,
843 int seq, int i1, int i2, int reg, int mask)
844 {
845 pmbus_add_boolean(data, name, type, seq,
846 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
847 }
848
849 static void pmbus_add_sensor(struct pmbus_data *data,
850 const char *name, const char *type, int seq,
851 int page, int reg, enum pmbus_sensor_classes class,
852 bool update, bool readonly)
853 {
854 struct pmbus_sensor *sensor;
855
856 BUG_ON(data->num_sensors >= data->max_sensors);
857
858 sensor = &data->sensors[data->num_sensors];
859 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
860 name, seq, type);
861 sensor->page = page;
862 sensor->reg = reg;
863 sensor->class = class;
864 sensor->update = update;
865 if (readonly)
866 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
867 data->num_sensors);
868 else
869 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
870 data->num_sensors);
871 data->num_sensors++;
872 }
873
874 static void pmbus_add_label(struct pmbus_data *data,
875 const char *name, int seq,
876 const char *lstring, int index)
877 {
878 struct pmbus_label *label;
879
880 BUG_ON(data->num_labels >= data->max_labels);
881
882 label = &data->labels[data->num_labels];
883 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
884 if (!index)
885 strncpy(label->label, lstring, sizeof(label->label) - 1);
886 else
887 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
888 index);
889
890 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
891 data->num_labels++;
892 }
893
894 /*
895 * Determine maximum number of sensors, booleans, and labels.
896 * To keep things simple, only make a rough high estimate.
897 */
898 static void pmbus_find_max_attr(struct i2c_client *client,
899 struct pmbus_data *data)
900 {
901 const struct pmbus_driver_info *info = data->info;
902 int page, max_sensors, max_booleans, max_labels;
903
904 max_sensors = PMBUS_MAX_INPUT_SENSORS;
905 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
906 max_labels = PMBUS_MAX_INPUT_LABELS;
907
908 for (page = 0; page < info->pages; page++) {
909 if (info->func[page] & PMBUS_HAVE_VOUT) {
910 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
911 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
912 max_labels++;
913 }
914 if (info->func[page] & PMBUS_HAVE_IOUT) {
915 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
916 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
917 max_labels++;
918 }
919 if (info->func[page] & PMBUS_HAVE_POUT) {
920 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
921 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
922 max_labels++;
923 }
924 if (info->func[page] & PMBUS_HAVE_FAN12) {
925 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
926 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
927 }
928 if (info->func[page] & PMBUS_HAVE_FAN34) {
929 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
930 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
931 }
932 if (info->func[page] & PMBUS_HAVE_TEMP) {
933 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
934 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
935 }
936 if (info->func[page] & PMBUS_HAVE_TEMP2) {
937 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
938 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
939 }
940 if (info->func[page] & PMBUS_HAVE_TEMP3) {
941 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
942 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
943 }
944 }
945 data->max_sensors = max_sensors;
946 data->max_booleans = max_booleans;
947 data->max_labels = max_labels;
948 data->max_attributes = max_sensors + max_booleans + max_labels;
949 }
950
951 /*
952 * Search for attributes. Allocate sensors, booleans, and labels as needed.
953 */
954
955 /*
956 * The pmbus_limit_attr structure describes a single limit attribute
957 * and its associated alarm attribute.
958 */
959 struct pmbus_limit_attr {
960 u16 reg; /* Limit register */
961 bool update; /* True if register needs updates */
962 const char *attr; /* Attribute name */
963 const char *alarm; /* Alarm attribute name */
964 u32 sbit; /* Alarm attribute status bit */
965 };
966
967 /*
968 * The pmbus_sensor_attr structure describes one sensor attribute. This
969 * description includes a reference to the associated limit attributes.
970 */
971 struct pmbus_sensor_attr {
972 u8 reg; /* sensor register */
973 enum pmbus_sensor_classes class;/* sensor class */
974 const char *label; /* sensor label */
975 bool paged; /* true if paged sensor */
976 bool update; /* true if update needed */
977 bool compare; /* true if compare function needed */
978 u32 func; /* sensor mask */
979 u32 sfunc; /* sensor status mask */
980 int sbase; /* status base register */
981 u32 gbit; /* generic status bit */
982 const struct pmbus_limit_attr *limit;/* limit registers */
983 int nlimit; /* # of limit registers */
984 };
985
986 /*
987 * Add a set of limit attributes and, if supported, the associated
988 * alarm attributes.
989 */
990 static bool pmbus_add_limit_attrs(struct i2c_client *client,
991 struct pmbus_data *data,
992 const struct pmbus_driver_info *info,
993 const char *name, int index, int page,
994 int cbase,
995 const struct pmbus_sensor_attr *attr)
996 {
997 const struct pmbus_limit_attr *l = attr->limit;
998 int nlimit = attr->nlimit;
999 bool have_alarm = false;
1000 int i, cindex;
1001
1002 for (i = 0; i < nlimit; i++) {
1003 if (pmbus_check_word_register(client, page, l->reg)) {
1004 cindex = data->num_sensors;
1005 pmbus_add_sensor(data, name, l->attr, index, page,
1006 l->reg, attr->class,
1007 attr->update || l->update,
1008 false);
1009 if (l->sbit && (info->func[page] & attr->sfunc)) {
1010 if (attr->compare) {
1011 pmbus_add_boolean_cmp(data, name,
1012 l->alarm, index,
1013 cbase, cindex,
1014 attr->sbase + page, l->sbit);
1015 } else {
1016 pmbus_add_boolean_reg(data, name,
1017 l->alarm, index,
1018 attr->sbase + page, l->sbit);
1019 }
1020 have_alarm = true;
1021 }
1022 }
1023 l++;
1024 }
1025 return have_alarm;
1026 }
1027
1028 static void pmbus_add_sensor_attrs_one(struct i2c_client *client,
1029 struct pmbus_data *data,
1030 const struct pmbus_driver_info *info,
1031 const char *name,
1032 int index, int page,
1033 const struct pmbus_sensor_attr *attr)
1034 {
1035 bool have_alarm;
1036 int cbase = data->num_sensors;
1037
1038 if (attr->label)
1039 pmbus_add_label(data, name, index, attr->label,
1040 attr->paged ? page + 1 : 0);
1041 pmbus_add_sensor(data, name, "input", index, page, attr->reg,
1042 attr->class, true, true);
1043 if (attr->sfunc) {
1044 have_alarm = pmbus_add_limit_attrs(client, data, info, name,
1045 index, page, cbase, attr);
1046 /*
1047 * Add generic alarm attribute only if there are no individual
1048 * alarm attributes, if there is a global alarm bit, and if
1049 * the generic status register for this page is accessible.
1050 */
1051 if (!have_alarm && attr->gbit &&
1052 pmbus_check_byte_register(client, page, PMBUS_STATUS_BYTE))
1053 pmbus_add_boolean_reg(data, name, "alarm", index,
1054 PB_STATUS_BASE + page,
1055 attr->gbit);
1056 }
1057 }
1058
1059 static void pmbus_add_sensor_attrs(struct i2c_client *client,
1060 struct pmbus_data *data,
1061 const char *name,
1062 const struct pmbus_sensor_attr *attrs,
1063 int nattrs)
1064 {
1065 const struct pmbus_driver_info *info = data->info;
1066 int index, i;
1067
1068 index = 1;
1069 for (i = 0; i < nattrs; i++) {
1070 int page, pages;
1071
1072 pages = attrs->paged ? info->pages : 1;
1073 for (page = 0; page < pages; page++) {
1074 if (!(info->func[page] & attrs->func))
1075 continue;
1076 pmbus_add_sensor_attrs_one(client, data, info, name,
1077 index, page, attrs);
1078 index++;
1079 }
1080 attrs++;
1081 }
1082 }
1083
1084 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1085 {
1086 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1087 .attr = "min",
1088 .alarm = "min_alarm",
1089 .sbit = PB_VOLTAGE_UV_WARNING,
1090 }, {
1091 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1092 .attr = "lcrit",
1093 .alarm = "lcrit_alarm",
1094 .sbit = PB_VOLTAGE_UV_FAULT,
1095 }, {
1096 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1097 .attr = "max",
1098 .alarm = "max_alarm",
1099 .sbit = PB_VOLTAGE_OV_WARNING,
1100 }, {
1101 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1102 .attr = "crit",
1103 .alarm = "crit_alarm",
1104 .sbit = PB_VOLTAGE_OV_FAULT,
1105 }, {
1106 .reg = PMBUS_VIRT_READ_VIN_AVG,
1107 .update = true,
1108 .attr = "average",
1109 }, {
1110 .reg = PMBUS_VIRT_READ_VIN_MIN,
1111 .update = true,
1112 .attr = "lowest",
1113 }, {
1114 .reg = PMBUS_VIRT_READ_VIN_MAX,
1115 .update = true,
1116 .attr = "highest",
1117 }, {
1118 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1119 .attr = "reset_history",
1120 },
1121 };
1122
1123 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1124 {
1125 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1126 .attr = "min",
1127 .alarm = "min_alarm",
1128 .sbit = PB_VOLTAGE_UV_WARNING,
1129 }, {
1130 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1131 .attr = "lcrit",
1132 .alarm = "lcrit_alarm",
1133 .sbit = PB_VOLTAGE_UV_FAULT,
1134 }, {
1135 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1136 .attr = "max",
1137 .alarm = "max_alarm",
1138 .sbit = PB_VOLTAGE_OV_WARNING,
1139 }, {
1140 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1141 .attr = "crit",
1142 .alarm = "crit_alarm",
1143 .sbit = PB_VOLTAGE_OV_FAULT,
1144 }, {
1145 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1146 .update = true,
1147 .attr = "average",
1148 }, {
1149 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1150 .update = true,
1151 .attr = "lowest",
1152 }, {
1153 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1154 .update = true,
1155 .attr = "highest",
1156 }, {
1157 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1158 .attr = "reset_history",
1159 }
1160 };
1161
1162 static const struct pmbus_sensor_attr voltage_attributes[] = {
1163 {
1164 .reg = PMBUS_READ_VIN,
1165 .class = PSC_VOLTAGE_IN,
1166 .label = "vin",
1167 .func = PMBUS_HAVE_VIN,
1168 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1169 .sbase = PB_STATUS_INPUT_BASE,
1170 .gbit = PB_STATUS_VIN_UV,
1171 .limit = vin_limit_attrs,
1172 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1173 }, {
1174 .reg = PMBUS_READ_VCAP,
1175 .class = PSC_VOLTAGE_IN,
1176 .label = "vcap",
1177 .func = PMBUS_HAVE_VCAP,
1178 }, {
1179 .reg = PMBUS_READ_VOUT,
1180 .class = PSC_VOLTAGE_OUT,
1181 .label = "vout",
1182 .paged = true,
1183 .func = PMBUS_HAVE_VOUT,
1184 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1185 .sbase = PB_STATUS_VOUT_BASE,
1186 .gbit = PB_STATUS_VOUT_OV,
1187 .limit = vout_limit_attrs,
1188 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1189 }
1190 };
1191
1192 /* Current attributes */
1193
1194 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1195 {
1196 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1197 .attr = "max",
1198 .alarm = "max_alarm",
1199 .sbit = PB_IIN_OC_WARNING,
1200 }, {
1201 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1202 .attr = "crit",
1203 .alarm = "crit_alarm",
1204 .sbit = PB_IIN_OC_FAULT,
1205 }, {
1206 .reg = PMBUS_VIRT_READ_IIN_AVG,
1207 .update = true,
1208 .attr = "average",
1209 }, {
1210 .reg = PMBUS_VIRT_READ_IIN_MIN,
1211 .update = true,
1212 .attr = "lowest",
1213 }, {
1214 .reg = PMBUS_VIRT_READ_IIN_MAX,
1215 .update = true,
1216 .attr = "highest",
1217 }, {
1218 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1219 .attr = "reset_history",
1220 }
1221 };
1222
1223 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1224 {
1225 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1226 .attr = "max",
1227 .alarm = "max_alarm",
1228 .sbit = PB_IOUT_OC_WARNING,
1229 }, {
1230 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1231 .attr = "lcrit",
1232 .alarm = "lcrit_alarm",
1233 .sbit = PB_IOUT_UC_FAULT,
1234 }, {
1235 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1236 .attr = "crit",
1237 .alarm = "crit_alarm",
1238 .sbit = PB_IOUT_OC_FAULT,
1239 }, {
1240 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1241 .update = true,
1242 .attr = "average",
1243 }, {
1244 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1245 .update = true,
1246 .attr = "lowest",
1247 }, {
1248 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1249 .update = true,
1250 .attr = "highest",
1251 }, {
1252 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1253 .attr = "reset_history",
1254 }
1255 };
1256
1257 static const struct pmbus_sensor_attr current_attributes[] = {
1258 {
1259 .reg = PMBUS_READ_IIN,
1260 .class = PSC_CURRENT_IN,
1261 .label = "iin",
1262 .func = PMBUS_HAVE_IIN,
1263 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1264 .sbase = PB_STATUS_INPUT_BASE,
1265 .limit = iin_limit_attrs,
1266 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1267 }, {
1268 .reg = PMBUS_READ_IOUT,
1269 .class = PSC_CURRENT_OUT,
1270 .label = "iout",
1271 .paged = true,
1272 .func = PMBUS_HAVE_IOUT,
1273 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1274 .sbase = PB_STATUS_IOUT_BASE,
1275 .gbit = PB_STATUS_IOUT_OC,
1276 .limit = iout_limit_attrs,
1277 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1278 }
1279 };
1280
1281 /* Power attributes */
1282
1283 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1284 {
1285 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1286 .attr = "max",
1287 .alarm = "alarm",
1288 .sbit = PB_PIN_OP_WARNING,
1289 }, {
1290 .reg = PMBUS_VIRT_READ_PIN_AVG,
1291 .update = true,
1292 .attr = "average",
1293 }, {
1294 .reg = PMBUS_VIRT_READ_PIN_MAX,
1295 .update = true,
1296 .attr = "input_highest",
1297 }, {
1298 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1299 .attr = "reset_history",
1300 }
1301 };
1302
1303 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1304 {
1305 .reg = PMBUS_POUT_MAX,
1306 .attr = "cap",
1307 .alarm = "cap_alarm",
1308 .sbit = PB_POWER_LIMITING,
1309 }, {
1310 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1311 .attr = "max",
1312 .alarm = "max_alarm",
1313 .sbit = PB_POUT_OP_WARNING,
1314 }, {
1315 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1316 .attr = "crit",
1317 .alarm = "crit_alarm",
1318 .sbit = PB_POUT_OP_FAULT,
1319 }
1320 };
1321
1322 static const struct pmbus_sensor_attr power_attributes[] = {
1323 {
1324 .reg = PMBUS_READ_PIN,
1325 .class = PSC_POWER,
1326 .label = "pin",
1327 .func = PMBUS_HAVE_PIN,
1328 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1329 .sbase = PB_STATUS_INPUT_BASE,
1330 .limit = pin_limit_attrs,
1331 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1332 }, {
1333 .reg = PMBUS_READ_POUT,
1334 .class = PSC_POWER,
1335 .label = "pout",
1336 .paged = true,
1337 .func = PMBUS_HAVE_POUT,
1338 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1339 .sbase = PB_STATUS_IOUT_BASE,
1340 .limit = pout_limit_attrs,
1341 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1342 }
1343 };
1344
1345 /* Temperature atributes */
1346
1347 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1348 {
1349 .reg = PMBUS_UT_WARN_LIMIT,
1350 .attr = "min",
1351 .alarm = "min_alarm",
1352 .sbit = PB_TEMP_UT_WARNING,
1353 }, {
1354 .reg = PMBUS_UT_FAULT_LIMIT,
1355 .attr = "lcrit",
1356 .alarm = "lcrit_alarm",
1357 .sbit = PB_TEMP_UT_FAULT,
1358 }, {
1359 .reg = PMBUS_OT_WARN_LIMIT,
1360 .attr = "max",
1361 .alarm = "max_alarm",
1362 .sbit = PB_TEMP_OT_WARNING,
1363 }, {
1364 .reg = PMBUS_OT_FAULT_LIMIT,
1365 .attr = "crit",
1366 .alarm = "crit_alarm",
1367 .sbit = PB_TEMP_OT_FAULT,
1368 }, {
1369 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1370 .attr = "lowest",
1371 }, {
1372 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1373 .attr = "highest",
1374 }, {
1375 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1376 .attr = "reset_history",
1377 }
1378 };
1379
1380 static const struct pmbus_limit_attr temp_limit_attrs23[] = {
1381 {
1382 .reg = PMBUS_UT_WARN_LIMIT,
1383 .attr = "min",
1384 .alarm = "min_alarm",
1385 .sbit = PB_TEMP_UT_WARNING,
1386 }, {
1387 .reg = PMBUS_UT_FAULT_LIMIT,
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 };
1403
1404 static const struct pmbus_sensor_attr temp_attributes[] = {
1405 {
1406 .reg = PMBUS_READ_TEMPERATURE_1,
1407 .class = PSC_TEMPERATURE,
1408 .paged = true,
1409 .update = true,
1410 .compare = true,
1411 .func = PMBUS_HAVE_TEMP,
1412 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1413 .sbase = PB_STATUS_TEMP_BASE,
1414 .gbit = PB_STATUS_TEMPERATURE,
1415 .limit = temp_limit_attrs,
1416 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1417 }, {
1418 .reg = PMBUS_READ_TEMPERATURE_2,
1419 .class = PSC_TEMPERATURE,
1420 .paged = true,
1421 .update = true,
1422 .compare = true,
1423 .func = PMBUS_HAVE_TEMP2,
1424 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1425 .sbase = PB_STATUS_TEMP_BASE,
1426 .gbit = PB_STATUS_TEMPERATURE,
1427 .limit = temp_limit_attrs23,
1428 .nlimit = ARRAY_SIZE(temp_limit_attrs23),
1429 }, {
1430 .reg = PMBUS_READ_TEMPERATURE_3,
1431 .class = PSC_TEMPERATURE,
1432 .paged = true,
1433 .update = true,
1434 .compare = true,
1435 .func = PMBUS_HAVE_TEMP3,
1436 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1437 .sbase = PB_STATUS_TEMP_BASE,
1438 .gbit = PB_STATUS_TEMPERATURE,
1439 .limit = temp_limit_attrs23,
1440 .nlimit = ARRAY_SIZE(temp_limit_attrs23),
1441 }
1442 };
1443
1444 static const int pmbus_fan_registers[] = {
1445 PMBUS_READ_FAN_SPEED_1,
1446 PMBUS_READ_FAN_SPEED_2,
1447 PMBUS_READ_FAN_SPEED_3,
1448 PMBUS_READ_FAN_SPEED_4
1449 };
1450
1451 static const int pmbus_fan_config_registers[] = {
1452 PMBUS_FAN_CONFIG_12,
1453 PMBUS_FAN_CONFIG_12,
1454 PMBUS_FAN_CONFIG_34,
1455 PMBUS_FAN_CONFIG_34
1456 };
1457
1458 static const int pmbus_fan_status_registers[] = {
1459 PMBUS_STATUS_FAN_12,
1460 PMBUS_STATUS_FAN_12,
1461 PMBUS_STATUS_FAN_34,
1462 PMBUS_STATUS_FAN_34
1463 };
1464
1465 static const u32 pmbus_fan_flags[] = {
1466 PMBUS_HAVE_FAN12,
1467 PMBUS_HAVE_FAN12,
1468 PMBUS_HAVE_FAN34,
1469 PMBUS_HAVE_FAN34
1470 };
1471
1472 static const u32 pmbus_fan_status_flags[] = {
1473 PMBUS_HAVE_STATUS_FAN12,
1474 PMBUS_HAVE_STATUS_FAN12,
1475 PMBUS_HAVE_STATUS_FAN34,
1476 PMBUS_HAVE_STATUS_FAN34
1477 };
1478
1479 /* Fans */
1480 static void pmbus_add_fan_attributes(struct i2c_client *client,
1481 struct pmbus_data *data)
1482 {
1483 const struct pmbus_driver_info *info = data->info;
1484 int index = 1;
1485 int page;
1486
1487 for (page = 0; page < info->pages; page++) {
1488 int f;
1489
1490 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1491 int regval;
1492
1493 if (!(info->func[page] & pmbus_fan_flags[f]))
1494 break;
1495
1496 if (!pmbus_check_word_register(client, page,
1497 pmbus_fan_registers[f]))
1498 break;
1499
1500 /*
1501 * Skip fan if not installed.
1502 * Each fan configuration register covers multiple fans,
1503 * so we have to do some magic.
1504 */
1505 regval = _pmbus_read_byte_data(client, page,
1506 pmbus_fan_config_registers[f]);
1507 if (regval < 0 ||
1508 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1509 continue;
1510
1511 pmbus_add_sensor(data, "fan", "input", index, page,
1512 pmbus_fan_registers[f], PSC_FAN, true,
1513 true);
1514
1515 /*
1516 * Each fan status register covers multiple fans,
1517 * so we have to do some magic.
1518 */
1519 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1520 pmbus_check_byte_register(client,
1521 page, pmbus_fan_status_registers[f])) {
1522 int base;
1523
1524 if (f > 1) /* fan 3, 4 */
1525 base = PB_STATUS_FAN34_BASE + page;
1526 else
1527 base = PB_STATUS_FAN_BASE + page;
1528 pmbus_add_boolean_reg(data, "fan", "alarm",
1529 index, base,
1530 PB_FAN_FAN1_WARNING >> (f & 1));
1531 pmbus_add_boolean_reg(data, "fan", "fault",
1532 index, base,
1533 PB_FAN_FAN1_FAULT >> (f & 1));
1534 }
1535 index++;
1536 }
1537 }
1538 }
1539
1540 static void pmbus_find_attributes(struct i2c_client *client,
1541 struct pmbus_data *data)
1542 {
1543 /* Voltage sensors */
1544 pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1545 ARRAY_SIZE(voltage_attributes));
1546
1547 /* Current sensors */
1548 pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1549 ARRAY_SIZE(current_attributes));
1550
1551 /* Power sensors */
1552 pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1553 ARRAY_SIZE(power_attributes));
1554
1555 /* Temperature sensors */
1556 pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1557 ARRAY_SIZE(temp_attributes));
1558
1559 /* Fans */
1560 pmbus_add_fan_attributes(client, data);
1561 }
1562
1563 /*
1564 * Identify chip parameters.
1565 * This function is called for all chips.
1566 */
1567 static int pmbus_identify_common(struct i2c_client *client,
1568 struct pmbus_data *data)
1569 {
1570 int vout_mode = -1, exponent;
1571
1572 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1573 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1574 if (vout_mode >= 0 && vout_mode != 0xff) {
1575 /*
1576 * Not all chips support the VOUT_MODE command,
1577 * so a failure to read it is not an error.
1578 */
1579 switch (vout_mode >> 5) {
1580 case 0: /* linear mode */
1581 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1582 return -ENODEV;
1583
1584 exponent = vout_mode & 0x1f;
1585 /* and sign-extend it */
1586 if (exponent & 0x10)
1587 exponent |= ~0x1f;
1588 data->exponent = exponent;
1589 break;
1590 case 1: /* VID mode */
1591 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1592 return -ENODEV;
1593 break;
1594 case 2: /* direct mode */
1595 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1596 return -ENODEV;
1597 break;
1598 default:
1599 return -ENODEV;
1600 }
1601 }
1602
1603 /* Determine maximum number of sensors, booleans, and labels */
1604 pmbus_find_max_attr(client, data);
1605 pmbus_clear_fault_page(client, 0);
1606 return 0;
1607 }
1608
1609 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1610 struct pmbus_driver_info *info)
1611 {
1612 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1613 struct pmbus_data *data;
1614 int ret;
1615
1616 if (!info) {
1617 dev_err(&client->dev, "Missing chip information");
1618 return -ENODEV;
1619 }
1620
1621 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1622 | I2C_FUNC_SMBUS_BYTE_DATA
1623 | I2C_FUNC_SMBUS_WORD_DATA))
1624 return -ENODEV;
1625
1626 data = kzalloc(sizeof(*data), GFP_KERNEL);
1627 if (!data) {
1628 dev_err(&client->dev, "No memory to allocate driver data\n");
1629 return -ENOMEM;
1630 }
1631
1632 i2c_set_clientdata(client, data);
1633 mutex_init(&data->update_lock);
1634
1635 /* Bail out if PMBus status register does not exist. */
1636 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
1637 dev_err(&client->dev, "PMBus status register not found\n");
1638 ret = -ENODEV;
1639 goto out_data;
1640 }
1641
1642 if (pdata)
1643 data->flags = pdata->flags;
1644 data->info = info;
1645
1646 pmbus_clear_faults(client);
1647
1648 if (info->identify) {
1649 ret = (*info->identify)(client, info);
1650 if (ret < 0) {
1651 dev_err(&client->dev, "Chip identification failed\n");
1652 goto out_data;
1653 }
1654 }
1655
1656 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1657 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1658 info->pages);
1659 ret = -EINVAL;
1660 goto out_data;
1661 }
1662
1663 ret = pmbus_identify_common(client, data);
1664 if (ret < 0) {
1665 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1666 goto out_data;
1667 }
1668
1669 ret = -ENOMEM;
1670 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1671 GFP_KERNEL);
1672 if (!data->sensors) {
1673 dev_err(&client->dev, "No memory to allocate sensor data\n");
1674 goto out_data;
1675 }
1676
1677 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1678 * data->max_booleans, GFP_KERNEL);
1679 if (!data->booleans) {
1680 dev_err(&client->dev, "No memory to allocate boolean data\n");
1681 goto out_sensors;
1682 }
1683
1684 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1685 GFP_KERNEL);
1686 if (!data->labels) {
1687 dev_err(&client->dev, "No memory to allocate label data\n");
1688 goto out_booleans;
1689 }
1690
1691 data->attributes = kzalloc(sizeof(struct attribute *)
1692 * data->max_attributes, GFP_KERNEL);
1693 if (!data->attributes) {
1694 dev_err(&client->dev, "No memory to allocate attribute data\n");
1695 goto out_labels;
1696 }
1697
1698 pmbus_find_attributes(client, data);
1699
1700 /*
1701 * If there are no attributes, something is wrong.
1702 * Bail out instead of trying to register nothing.
1703 */
1704 if (!data->num_attributes) {
1705 dev_err(&client->dev, "No attributes found\n");
1706 ret = -ENODEV;
1707 goto out_attributes;
1708 }
1709
1710 /* Register sysfs hooks */
1711 data->group.attrs = data->attributes;
1712 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1713 if (ret) {
1714 dev_err(&client->dev, "Failed to create sysfs entries\n");
1715 goto out_attributes;
1716 }
1717 data->hwmon_dev = hwmon_device_register(&client->dev);
1718 if (IS_ERR(data->hwmon_dev)) {
1719 ret = PTR_ERR(data->hwmon_dev);
1720 dev_err(&client->dev, "Failed to register hwmon device\n");
1721 goto out_hwmon_device_register;
1722 }
1723 return 0;
1724
1725 out_hwmon_device_register:
1726 sysfs_remove_group(&client->dev.kobj, &data->group);
1727 out_attributes:
1728 kfree(data->attributes);
1729 out_labels:
1730 kfree(data->labels);
1731 out_booleans:
1732 kfree(data->booleans);
1733 out_sensors:
1734 kfree(data->sensors);
1735 out_data:
1736 kfree(data);
1737 return ret;
1738 }
1739 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1740
1741 int pmbus_do_remove(struct i2c_client *client)
1742 {
1743 struct pmbus_data *data = i2c_get_clientdata(client);
1744 hwmon_device_unregister(data->hwmon_dev);
1745 sysfs_remove_group(&client->dev.kobj, &data->group);
1746 kfree(data->attributes);
1747 kfree(data->labels);
1748 kfree(data->booleans);
1749 kfree(data->sensors);
1750 kfree(data);
1751 return 0;
1752 }
1753 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1754
1755 MODULE_AUTHOR("Guenter Roeck");
1756 MODULE_DESCRIPTION("PMBus core driver");
1757 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree