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hwmon: (pmbus) Improve support for paged fans
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / hwmon / pmbus_core.c
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442aba78
GR		 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 11 /* 6*volt, 3*curr, 2*power */
37#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
38 crit */
39#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
40#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
41#define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
42#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
43 crit */
44
45#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
46 lcrit_alarm, crit_alarm;
47 c: alarm, crit_alarm;
48 p: crit_alarm */
49#define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
50 lcrit_alarm, crit_alarm */
51#define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
52 crit_alarm */
53#define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
54#define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
55#define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
56 lcrit_alarm, crit_alarm */
57
58#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
59
60/*
954df676
GR		 61 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
62 * are paged. status_input is unpaged.
442aba78 63 */
954df676 64#define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
442aba78
GR		 65
66/*
67 * Index into status register array, per status register group
68 */
69#define PB_STATUS_BASE 0
70#define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
71#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
72#define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
73#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
954df676 74#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
442aba78
GR		 75#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
76
77struct pmbus_sensor {
78 char name[I2C_NAME_SIZE]; /* sysfs sensor name */
79 struct sensor_device_attribute attribute;
80 u8 page; /* page number */
81 u8 reg; /* register */
82 enum pmbus_sensor_classes class; /* sensor class */
83 bool update; /* runtime sensor update needed */
84 int data; /* Sensor data.
85 Negative if there was a read error */
86};
87
88struct pmbus_boolean {
89 char name[I2C_NAME_SIZE]; /* sysfs boolean name */
90 struct sensor_device_attribute attribute;
91};
92
93struct pmbus_label {
94 char name[I2C_NAME_SIZE]; /* sysfs label name */
95 struct sensor_device_attribute attribute;
96 char label[I2C_NAME_SIZE]; /* label */
97};
98
99struct pmbus_data {
100 struct device *hwmon_dev;
101
102 u32 flags; /* from platform data */
103
104 int exponent; /* linear mode: exponent for output voltages */
105
106 const struct pmbus_driver_info *info;
107
108 int max_attributes;
109 int num_attributes;
110 struct attribute **attributes;
111 struct attribute_group group;
112
113 /*
114 * Sensors cover both sensor and limit registers.
115 */
116 int max_sensors;
117 int num_sensors;
118 struct pmbus_sensor *sensors;
119 /*
120 * Booleans are used for alarms.
121 * Values are determined from status registers.
122 */
123 int max_booleans;
124 int num_booleans;
125 struct pmbus_boolean *booleans;
126 /*
127 * Labels are used to map generic names (e.g., "in1")
128 * to PMBus specific names (e.g., "vin" or "vout1").
129 */
130 int max_labels;
131 int num_labels;
132 struct pmbus_label *labels;
133
134 struct mutex update_lock;
135 bool valid;
136 unsigned long last_updated; /* in jiffies */
137
138 /*
139 * A single status register covers multiple attributes,
140 * so we keep them all together.
141 */
142 u8 status_bits;
143 u8 status[PB_NUM_STATUS_REG];
144
145 u8 currpage;
146};
147
148int pmbus_set_page(struct i2c_client *client, u8 page)
149{
150 struct pmbus_data *data = i2c_get_clientdata(client);
151 int rv = 0;
152 int newpage;
153
154 if (page != data->currpage) {
155 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
156 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
157 if (newpage != page)
158 rv = -EINVAL;
159 else
160 data->currpage = page;
161 }
162 return rv;
163}
164EXPORT_SYMBOL_GPL(pmbus_set_page);
165
166static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
167{
168 int rv;
169
170 rv = pmbus_set_page(client, page);
171 if (rv < 0)
172 return rv;
173
174 return i2c_smbus_write_byte(client, value);
175}
176
177static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
178 u16 word)
179{
180 int rv;
181
182 rv = pmbus_set_page(client, page);
183 if (rv < 0)
184 return rv;
185
186 return i2c_smbus_write_word_data(client, reg, word);
187}
188
189int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
190{
191 int rv;
192
193 rv = pmbus_set_page(client, page);
194 if (rv < 0)
195 return rv;
196
197 return i2c_smbus_read_word_data(client, reg);
198}
199EXPORT_SYMBOL_GPL(pmbus_read_word_data);
200
201static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
202{
203 int rv;
204
205 rv = pmbus_set_page(client, page);
206 if (rv < 0)
207 return rv;
208
209 return i2c_smbus_read_byte_data(client, reg);
210}
211
212static void pmbus_clear_fault_page(struct i2c_client *client, int page)
213{
214 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
215}
216
217void pmbus_clear_faults(struct i2c_client *client)
218{
219 struct pmbus_data *data = i2c_get_clientdata(client);
220 int i;
221
222 for (i = 0; i < data->info->pages; i++)
223 pmbus_clear_fault_page(client, i);
224}
225EXPORT_SYMBOL_GPL(pmbus_clear_faults);
226
227static int pmbus_check_status_cml(struct i2c_client *client, int page)
228{
229 int status, status2;
230
231 status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
232 if (status < 0 || (status & PB_STATUS_CML)) {
233 status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
234 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
235 return -EINVAL;
236 }
237 return 0;
238}
239
240bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
241{
242 int rv;
243 struct pmbus_data *data = i2c_get_clientdata(client);
244
245 rv = pmbus_read_byte_data(client, page, reg);
246 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
247 rv = pmbus_check_status_cml(client, page);
248 pmbus_clear_fault_page(client, page);
249 return rv >= 0;
250}
251EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
252
253bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
254{
255 int rv;
256 struct pmbus_data *data = i2c_get_clientdata(client);
257
258 rv = pmbus_read_word_data(client, page, reg);
259 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
260 rv = pmbus_check_status_cml(client, page);
261 pmbus_clear_fault_page(client, page);
262 return rv >= 0;
263}
264EXPORT_SYMBOL_GPL(pmbus_check_word_register);
265
266const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
267{
268 struct pmbus_data *data = i2c_get_clientdata(client);
269
270 return data->info;
271}
272EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
273
274static int pmbus_get_status(struct i2c_client *client, int page, int reg)
275{
276 struct pmbus_data *data = i2c_get_clientdata(client);
277 const struct pmbus_driver_info *info = data->info;
278 int status;
279
280 if (info->get_status) {
281 status = info->get_status(client, page, reg);
282 if (status != -ENODATA)
283 return status;
284 }
285 return pmbus_read_byte_data(client, page, reg);
286}
287
288static struct pmbus_data *pmbus_update_device(struct device *dev)
289{
290 struct i2c_client *client = to_i2c_client(dev);
291 struct pmbus_data *data = i2c_get_clientdata(client);
292 const struct pmbus_driver_info *info = data->info;
293
294 mutex_lock(&data->update_lock);
295 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
296 int i;
297
298 for (i = 0; i < info->pages; i++)
299 data->status[PB_STATUS_BASE + i]
300 = pmbus_read_byte_data(client, i,
301 PMBUS_STATUS_BYTE);
302 for (i = 0; i < info->pages; i++) {
303 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
304 continue;
305 data->status[PB_STATUS_VOUT_BASE + i]
306 = pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
307 }
308 for (i = 0; i < info->pages; i++) {
309 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
310 continue;
311 data->status[PB_STATUS_IOUT_BASE + i]
312 = pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
313 }
314 for (i = 0; i < info->pages; i++) {
315 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
316 continue;
317 data->status[PB_STATUS_TEMP_BASE + i]
318 = pmbus_get_status(client, i,
319 PMBUS_STATUS_TEMPERATURE);
320 }
321 for (i = 0; i < info->pages; i++) {
322 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
323 continue;
324 data->status[PB_STATUS_FAN_BASE + i]
325 = pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
326 }
327
954df676
GR		 328 for (i = 0; i < info->pages; i++) {
329 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
330 continue;
331 data->status[PB_STATUS_FAN34_BASE + i]
332 = pmbus_get_status(client, i, PMBUS_STATUS_FAN_34);
333 }
334
442aba78
GR		 335 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
336 data->status[PB_STATUS_INPUT_BASE]
337 = pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
338
442aba78
GR		 339 for (i = 0; i < data->num_sensors; i++) {
340 struct pmbus_sensor *sensor = &data->sensors[i];
341
342 if (!data->valid || sensor->update)
343 sensor->data
344 = pmbus_read_word_data(client, sensor->page,
345 sensor->reg);
346 }
347 pmbus_clear_faults(client);
348 data->last_updated = jiffies;
349 data->valid = 1;
350 }
351 mutex_unlock(&data->update_lock);
352 return data;
353}
354
355/*
356 * Convert linear sensor values to milli- or micro-units
357 * depending on sensor type.
358 */
359static int pmbus_reg2data_linear(struct pmbus_data *data,
360 struct pmbus_sensor *sensor)
361{
362 s16 exponent, mantissa;
363 long val;
364
365 if (sensor->class == PSC_VOLTAGE_OUT) {
366 exponent = data->exponent;
367 mantissa = (s16) sensor->data;
368 } else {
369 exponent = (sensor->data >> 11) & 0x001f;
370 mantissa = sensor->data & 0x07ff;
371
372 if (exponent > 0x0f)
373 exponent |= 0xffe0; /* sign extend exponent */
374 if (mantissa > 0x03ff)
375 mantissa |= 0xf800; /* sign extend mantissa */
376 }
377
378 val = mantissa;
379
380 /* scale result to milli-units for all sensors except fans */
381 if (sensor->class != PSC_FAN)
382 val = val * 1000L;
383
384 /* scale result to micro-units for power sensors */
385 if (sensor->class == PSC_POWER)
386 val = val * 1000L;
387
388 if (exponent >= 0)
389 val <<= exponent;
390 else
391 val >>= -exponent;
392
393 return (int)val;
394}
395
396/*
397 * Convert direct sensor values to milli- or micro-units
398 * depending on sensor type.
399 */
400static int pmbus_reg2data_direct(struct pmbus_data *data,
401 struct pmbus_sensor *sensor)
402{
403 long val = (s16) sensor->data;
404 long m, b, R;
405
406 m = data->info->m[sensor->class];
407 b = data->info->b[sensor->class];
408 R = data->info->R[sensor->class];
409
410 if (m == 0)
411 return 0;
412
413 /* X = 1/m * (Y * 10^-R - b) */
414 R = -R;
415 /* scale result to milli-units for everything but fans */
416 if (sensor->class != PSC_FAN) {
417 R += 3;
418 b *= 1000;
419 }
420
421 /* scale result to micro-units for power sensors */
422 if (sensor->class == PSC_POWER) {
423 R += 3;
424 b *= 1000;
425 }
426
427 while (R > 0) {
428 val *= 10;
429 R--;
430 }
431 while (R < 0) {
432 val = DIV_ROUND_CLOSEST(val, 10);
433 R++;
434 }
435
436 return (int)((val - b) / m);
437}
438
439static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
440{
441 int val;
442
443 if (data->info->direct[sensor->class])
444 val = pmbus_reg2data_direct(data, sensor);
445 else
446 val = pmbus_reg2data_linear(data, sensor);
447
448 return val;
449}
450
451#define MAX_MANTISSA (1023 * 1000)
452#define MIN_MANTISSA (511 * 1000)
453
454static u16 pmbus_data2reg_linear(struct pmbus_data *data,
455 enum pmbus_sensor_classes class, long val)
456{
457 s16 exponent = 0, mantissa = 0;
458 bool negative = false;
459
460 /* simple case */
461 if (val == 0)
462 return 0;
463
464 if (val < 0) {
465 negative = true;
466 val = -val;
467 }
468
469 if (class == PSC_VOLTAGE_OUT) {
470 /*
471 * For a static exponents, we don't have a choice
472 * but to adjust the value to it.
473 */
474 if (data->exponent < 0)
475 val <<= -data->exponent;
476 else
477 val >>= data->exponent;
478 val = DIV_ROUND_CLOSEST(val, 1000);
479 if (val > 0x7fff)
480 val = 0x7fff;
481 return negative ? -val : val;
482 }
483
484 /* Power is in uW. Convert to mW before converting. */
485 if (class == PSC_POWER)
486 val = DIV_ROUND_CLOSEST(val, 1000L);
487
488 /*
489 * For simplicity, convert fan data to milli-units
490 * before calculating the exponent.
491 */
492 if (class == PSC_FAN)
493 val = val * 1000;
494
495 /* Reduce large mantissa until it fits into 10 bit */
496 while (val >= MAX_MANTISSA && exponent < 15) {
497 exponent++;
498 val >>= 1;
499 }
500 /* Increase small mantissa to improve precision */
501 while (val < MIN_MANTISSA && exponent > -15) {
502 exponent--;
503 val <<= 1;
504 }
505
506 /* Convert mantissa from milli-units to units */
507 mantissa = DIV_ROUND_CLOSEST(val, 1000);
508
509 /* Ensure that resulting number is within range */
510 if (mantissa > 0x3ff)
511 mantissa = 0x3ff;
512
513 /* restore sign */
514 if (negative)
515 mantissa = -mantissa;
516
517 /* Convert to 5 bit exponent, 11 bit mantissa */
518 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
519}
520
521static u16 pmbus_data2reg_direct(struct pmbus_data *data,
522 enum pmbus_sensor_classes class, long val)
523{
524 long m, b, R;
525
526 m = data->info->m[class];
527 b = data->info->b[class];
528 R = data->info->R[class];
529
530 /* Power is in uW. Adjust R and b. */
531 if (class == PSC_POWER) {
532 R -= 3;
533 b *= 1000;
534 }
535
536 /* Calculate Y = (m * X + b) * 10^R */
537 if (class != PSC_FAN) {
538 R -= 3; /* Adjust R and b for data in milli-units */
539 b *= 1000;
540 }
541 val = val * m + b;
542
543 while (R > 0) {
544 val *= 10;
545 R--;
546 }
547 while (R < 0) {
548 val = DIV_ROUND_CLOSEST(val, 10);
549 R++;
550 }
551
552 return val;
553}
554
555static u16 pmbus_data2reg(struct pmbus_data *data,
556 enum pmbus_sensor_classes class, long val)
557{
558 u16 regval;
559
560 if (data->info->direct[class])
561 regval = pmbus_data2reg_direct(data, class, val);
562 else
563 regval = pmbus_data2reg_linear(data, class, val);
564
565 return regval;
566}
567
568/*
569 * Return boolean calculated from converted data.
570 * <index> defines a status register index and mask, and optionally
571 * two sensor indexes.
572 * The upper half-word references the two sensors,
573 * two sensor indices.
574 * The upper half-word references the two optional sensors,
575 * the lower half word references status register and mask.
576 * The function returns true if (status[reg] & mask) is true and,
577 * if specified, if v1 >= v2.
578 * To determine if an object exceeds upper limits, specify <v, limit>.
579 * To determine if an object exceeds lower limits, specify <limit, v>.
580 *
581 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
582 * index are set. s1 and s2 (the sensor index values) are zero in this case.
583 * The function returns true if (status[reg] & mask) is true.
584 *
585 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
586 * a specified limit has to be performed to determine the boolean result.
587 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
588 * sensor values referenced by sensor indices s1 and s2).
589 *
590 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
591 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
592 *
593 * If a negative value is stored in any of the referenced registers, this value
594 * reflects an error code which will be returned.
595 */
596static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
597{
598 u8 s1 = (index >> 24) & 0xff;
599 u8 s2 = (index >> 16) & 0xff;
600 u8 reg = (index >> 8) & 0xff;
601 u8 mask = index & 0xff;
602 int status;
603 u8 regval;
604
605 status = data->status[reg];
606 if (status < 0)
607 return status;
608
609 regval = status & mask;
610 if (!s1 && !s2)
611 *val = !!regval;
612 else {
613 int v1, v2;
614 struct pmbus_sensor *sensor1, *sensor2;
615
616 sensor1 = &data->sensors[s1];
617 if (sensor1->data < 0)
618 return sensor1->data;
619 sensor2 = &data->sensors[s2];
620 if (sensor2->data < 0)
621 return sensor2->data;
622
623 v1 = pmbus_reg2data(data, sensor1);
624 v2 = pmbus_reg2data(data, sensor2);
625 *val = !!(regval && v1 >= v2);
626 }
627 return 0;
628}
629
630static ssize_t pmbus_show_boolean(struct device *dev,
631 struct device_attribute *da, char *buf)
632{
633 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
634 struct pmbus_data *data = pmbus_update_device(dev);
635 int val;
636 int err;
637
638 err = pmbus_get_boolean(data, attr->index, &val);
639 if (err)
640 return err;
641 return snprintf(buf, PAGE_SIZE, "%d\n", val);
642}
643
644static ssize_t pmbus_show_sensor(struct device *dev,
645 struct device_attribute *da, char *buf)
646{
647 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
648 struct pmbus_data *data = pmbus_update_device(dev);
649 struct pmbus_sensor *sensor;
650
651 sensor = &data->sensors[attr->index];
652 if (sensor->data < 0)
653 return sensor->data;
654
655 return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
656}
657
658static ssize_t pmbus_set_sensor(struct device *dev,
659 struct device_attribute *devattr,
660 const char *buf, size_t count)
661{
662 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
663 struct i2c_client *client = to_i2c_client(dev);
664 struct pmbus_data *data = i2c_get_clientdata(client);
665 struct pmbus_sensor *sensor = &data->sensors[attr->index];
666 ssize_t rv = count;
667 long val = 0;
668 int ret;
669 u16 regval;
670
671 if (strict_strtol(buf, 10, &val) < 0)
672 return -EINVAL;
673
674 mutex_lock(&data->update_lock);
675 regval = pmbus_data2reg(data, sensor->class, val);
676 ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
677 if (ret < 0)
678 rv = ret;
679 else
680 data->sensors[attr->index].data = regval;
681 mutex_unlock(&data->update_lock);
682 return rv;
683}
684
685static ssize_t pmbus_show_label(struct device *dev,
686 struct device_attribute *da, char *buf)
687{
688 struct i2c_client *client = to_i2c_client(dev);
689 struct pmbus_data *data = i2c_get_clientdata(client);
690 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
691
692 return snprintf(buf, PAGE_SIZE, "%s\n",
693 data->labels[attr->index].label);
694}
695
696#define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
697do { \
698 struct sensor_device_attribute *a \
699 = &data->_type##s[data->num_##_type##s].attribute; \
700 BUG_ON(data->num_attributes >= data->max_attributes); \
701 a->dev_attr.attr.name = _name; \
702 a->dev_attr.attr.mode = _mode; \
703 a->dev_attr.show = _show; \
704 a->dev_attr.store = _set; \
705 a->index = _idx; \
706 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
707 data->num_attributes++; \
708} while (0)
709
710#define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
711 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
712 pmbus_show_##_type, NULL)
713
714#define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
715 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
716 pmbus_show_##_type, pmbus_set_##_type)
717
718static void pmbus_add_boolean(struct pmbus_data *data,
719 const char *name, const char *type, int seq,
720 int idx)
721{
722 struct pmbus_boolean *boolean;
723
724 BUG_ON(data->num_booleans >= data->max_booleans);
725
726 boolean = &data->booleans[data->num_booleans];
727
728 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
729 name, seq, type);
730 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
731 data->num_booleans++;
732}
733
734static void pmbus_add_boolean_reg(struct pmbus_data *data,
735 const char *name, const char *type,
736 int seq, int reg, int bit)
737{
738 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
739}
740
741static void pmbus_add_boolean_cmp(struct pmbus_data *data,
742 const char *name, const char *type,
743 int seq, int i1, int i2, int reg, int mask)
744{
745 pmbus_add_boolean(data, name, type, seq,
746 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
747}
748
749static void pmbus_add_sensor(struct pmbus_data *data,
750 const char *name, const char *type, int seq,
751 int page, int reg, enum pmbus_sensor_classes class,
752 bool update)
753{
754 struct pmbus_sensor *sensor;
755
756 BUG_ON(data->num_sensors >= data->max_sensors);
757
758 sensor = &data->sensors[data->num_sensors];
759 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
760 name, seq, type);
761 sensor->page = page;
762 sensor->reg = reg;
763 sensor->class = class;
764 sensor->update = update;
765 if (update)
766 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
767 data->num_sensors);
768 else
769 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
770 data->num_sensors);
771 data->num_sensors++;
772}
773
774static void pmbus_add_label(struct pmbus_data *data,
775 const char *name, int seq,
776 const char *lstring, int index)
777{
778 struct pmbus_label *label;
779
780 BUG_ON(data->num_labels >= data->max_labels);
781
782 label = &data->labels[data->num_labels];
783 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
784 if (!index)
785 strncpy(label->label, lstring, sizeof(label->label) - 1);
786 else
787 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
788 index);
789
790 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
791 data->num_labels++;
792}
793
794static const int pmbus_temp_registers[] = {
795 PMBUS_READ_TEMPERATURE_1,
796 PMBUS_READ_TEMPERATURE_2,
797 PMBUS_READ_TEMPERATURE_3
798};
799
800static const int pmbus_fan_registers[] = {
801 PMBUS_READ_FAN_SPEED_1,
802 PMBUS_READ_FAN_SPEED_2,
803 PMBUS_READ_FAN_SPEED_3,
804 PMBUS_READ_FAN_SPEED_4
805};
806
807static const int pmbus_fan_config_registers[] = {
808 PMBUS_FAN_CONFIG_12,
809 PMBUS_FAN_CONFIG_12,
810 PMBUS_FAN_CONFIG_34,
811 PMBUS_FAN_CONFIG_34
812};
813
814static const int pmbus_fan_status_registers[] = {
815 PMBUS_STATUS_FAN_12,
816 PMBUS_STATUS_FAN_12,
817 PMBUS_STATUS_FAN_34,
818 PMBUS_STATUS_FAN_34
819};
820
954df676
GR		 821static const u32 pmbus_fan_flags[] = {
822 PMBUS_HAVE_FAN12,
823 PMBUS_HAVE_FAN12,
824 PMBUS_HAVE_FAN34,
825 PMBUS_HAVE_FAN34
826};
827
828static const u32 pmbus_fan_status_flags[] = {
829 PMBUS_HAVE_STATUS_FAN12,
830 PMBUS_HAVE_STATUS_FAN12,
831 PMBUS_HAVE_STATUS_FAN34,
832 PMBUS_HAVE_STATUS_FAN34
833};
834
442aba78
GR		 835/*
836 * Determine maximum number of sensors, booleans, and labels.
837 * To keep things simple, only make a rough high estimate.
838 */
839static void pmbus_find_max_attr(struct i2c_client *client,
840 struct pmbus_data *data)
841{
842 const struct pmbus_driver_info *info = data->info;
843 int page, max_sensors, max_booleans, max_labels;
844
845 max_sensors = PMBUS_MAX_INPUT_SENSORS;
846 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
847 max_labels = PMBUS_MAX_INPUT_LABELS;
848
849 for (page = 0; page < info->pages; page++) {
850 if (info->func[page] & PMBUS_HAVE_VOUT) {
851 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
852 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
853 max_labels++;
854 }
855 if (info->func[page] & PMBUS_HAVE_IOUT) {
856 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
857 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
858 max_labels++;
859 }
860 if (info->func[page] & PMBUS_HAVE_POUT) {
861 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
862 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
863 max_labels++;
864 }
865 if (info->func[page] & PMBUS_HAVE_FAN12) {
954df676
GR		 866 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
867 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
868 }
869 if (info->func[page] & PMBUS_HAVE_FAN34) {
870 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
871 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
442aba78
GR		 872 }
873 if (info->func[page] & PMBUS_HAVE_TEMP) {
874 if (page == 0) {
875 max_sensors +=
876 ARRAY_SIZE(pmbus_temp_registers) *
877 PMBUS_MAX_SENSORS_PER_TEMP;
878 max_booleans +=
879 ARRAY_SIZE(pmbus_temp_registers) *
880 PMBUS_MAX_BOOLEANS_PER_TEMP;
881 } else {
882 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
883 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
884 }
885 }
886 }
887 data->max_sensors = max_sensors;
888 data->max_booleans = max_booleans;
889 data->max_labels = max_labels;
890 data->max_attributes = max_sensors + max_booleans + max_labels;
891}
892
893/*
894 * Search for attributes. Allocate sensors, booleans, and labels as needed.
895 */
896static void pmbus_find_attributes(struct i2c_client *client,
897 struct pmbus_data *data)
898{
899 const struct pmbus_driver_info *info = data->info;
900 int page, i0, i1, in_index;
901
902 /*
903 * Input voltage sensors
904 */
905 in_index = 1;
906 if (info->func[0] & PMBUS_HAVE_VIN) {
907 bool have_alarm = false;
908
909 i0 = data->num_sensors;
910 pmbus_add_label(data, "in", in_index, "vin", 0);
911 pmbus_add_sensor(data, "in", "input", in_index,
912 0, PMBUS_READ_VIN, PSC_VOLTAGE_IN, true);
913 if (pmbus_check_word_register(client, 0,
914 PMBUS_VIN_UV_WARN_LIMIT)) {
915 i1 = data->num_sensors;
916 pmbus_add_sensor(data, "in", "min", in_index,
917 0, PMBUS_VIN_UV_WARN_LIMIT,
918 PSC_VOLTAGE_IN, false);
919 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
920 pmbus_add_boolean_reg(data, "in", "min_alarm",
921 in_index,
922 PB_STATUS_INPUT_BASE,
923 PB_VOLTAGE_UV_WARNING);
924 have_alarm = true;
925 }
926 }
927 if (pmbus_check_word_register(client, 0,
928 PMBUS_VIN_UV_FAULT_LIMIT)) {
929 i1 = data->num_sensors;
930 pmbus_add_sensor(data, "in", "lcrit", in_index,
931 0, PMBUS_VIN_UV_FAULT_LIMIT,
932 PSC_VOLTAGE_IN, false);
933 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
934 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
935 in_index,
936 PB_STATUS_INPUT_BASE,
937 PB_VOLTAGE_UV_FAULT);
938 have_alarm = true;
939 }
940 }
941 if (pmbus_check_word_register(client, 0,
942 PMBUS_VIN_OV_WARN_LIMIT)) {
943 i1 = data->num_sensors;
944 pmbus_add_sensor(data, "in", "max", in_index,
945 0, PMBUS_VIN_OV_WARN_LIMIT,
946 PSC_VOLTAGE_IN, false);
947 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
948 pmbus_add_boolean_reg(data, "in", "max_alarm",
949 in_index,
950 PB_STATUS_INPUT_BASE,
951 PB_VOLTAGE_OV_WARNING);
952 have_alarm = true;
953 }
954 }
955 if (pmbus_check_word_register(client, 0,
956 PMBUS_VIN_OV_FAULT_LIMIT)) {
957 i1 = data->num_sensors;
958 pmbus_add_sensor(data, "in", "crit", in_index,
959 0, PMBUS_VIN_OV_FAULT_LIMIT,
960 PSC_VOLTAGE_IN, false);
961 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
962 pmbus_add_boolean_reg(data, "in", "crit_alarm",
963 in_index,
964 PB_STATUS_INPUT_BASE,
965 PB_VOLTAGE_OV_FAULT);
966 have_alarm = true;
967 }
968 }
969 /*
970 * Add generic alarm attribute only if there are no individual
971 * attributes.
972 */
973 if (!have_alarm)
974 pmbus_add_boolean_reg(data, "in", "alarm",
975 in_index,
976 PB_STATUS_BASE,
977 PB_STATUS_VIN_UV);
978 in_index++;
979 }
980 if (info->func[0] & PMBUS_HAVE_VCAP) {
981 pmbus_add_label(data, "in", in_index, "vcap", 0);
982 pmbus_add_sensor(data, "in", "input", in_index, 0,
983 PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
984 in_index++;
985 }
986
987 /*
988 * Output voltage sensors
989 */
990 for (page = 0; page < info->pages; page++) {
991 bool have_alarm = false;
992
993 if (!(info->func[page] & PMBUS_HAVE_VOUT))
994 continue;
995
996 i0 = data->num_sensors;
997 pmbus_add_label(data, "in", in_index, "vout", page + 1);
998 pmbus_add_sensor(data, "in", "input", in_index, page,
999 PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
1000 if (pmbus_check_word_register(client, page,
1001 PMBUS_VOUT_UV_WARN_LIMIT)) {
1002 i1 = data->num_sensors;
1003 pmbus_add_sensor(data, "in", "min", in_index, page,
1004 PMBUS_VOUT_UV_WARN_LIMIT,
1005 PSC_VOLTAGE_OUT, false);
1006 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1007 pmbus_add_boolean_reg(data, "in", "min_alarm",
1008 in_index,
1009 PB_STATUS_VOUT_BASE +
1010 page,
1011 PB_VOLTAGE_UV_WARNING);
1012 have_alarm = true;
1013 }
1014 }
1015 if (pmbus_check_word_register(client, page,
1016 PMBUS_VOUT_UV_FAULT_LIMIT)) {
1017 i1 = data->num_sensors;
1018 pmbus_add_sensor(data, "in", "lcrit", in_index, page,
1019 PMBUS_VOUT_UV_FAULT_LIMIT,
1020 PSC_VOLTAGE_OUT, false);
1021 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1022 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
1023 in_index,
1024 PB_STATUS_VOUT_BASE +
1025 page,
1026 PB_VOLTAGE_UV_FAULT);
1027 have_alarm = true;
1028 }
1029 }
1030 if (pmbus_check_word_register(client, page,
1031 PMBUS_VOUT_OV_WARN_LIMIT)) {
1032 i1 = data->num_sensors;
1033 pmbus_add_sensor(data, "in", "max", in_index, page,
1034 PMBUS_VOUT_OV_WARN_LIMIT,
1035 PSC_VOLTAGE_OUT, false);
1036 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1037 pmbus_add_boolean_reg(data, "in", "max_alarm",
1038 in_index,
1039 PB_STATUS_VOUT_BASE +
1040 page,
1041 PB_VOLTAGE_OV_WARNING);
1042 have_alarm = true;
1043 }
1044 }
1045 if (pmbus_check_word_register(client, page,
1046 PMBUS_VOUT_OV_FAULT_LIMIT)) {
1047 i1 = data->num_sensors;
1048 pmbus_add_sensor(data, "in", "crit", in_index, page,
1049 PMBUS_VOUT_OV_FAULT_LIMIT,
1050 PSC_VOLTAGE_OUT, false);
1051 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1052 pmbus_add_boolean_reg(data, "in", "crit_alarm",
1053 in_index,
1054 PB_STATUS_VOUT_BASE +
1055 page,
1056 PB_VOLTAGE_OV_FAULT);
1057 have_alarm = true;
1058 }
1059 }
1060 /*
1061 * Add generic alarm attribute only if there are no individual
1062 * attributes.
1063 */
1064 if (!have_alarm)
1065 pmbus_add_boolean_reg(data, "in", "alarm",
1066 in_index,
1067 PB_STATUS_BASE + page,
1068 PB_STATUS_VOUT_OV);
1069 in_index++;
1070 }
1071
1072 /*
1073 * Current sensors
1074 */
1075
1076 /*
1077 * Input current sensors
1078 */
1079 in_index = 1;
1080 if (info->func[0] & PMBUS_HAVE_IIN) {
1081 i0 = data->num_sensors;
1082 pmbus_add_label(data, "curr", in_index, "iin", 0);
1083 pmbus_add_sensor(data, "curr", "input", in_index,
1084 0, PMBUS_READ_IIN, PSC_CURRENT_IN, true);
1085 if (pmbus_check_word_register(client, 0,
1086 PMBUS_IIN_OC_WARN_LIMIT)) {
1087 i1 = data->num_sensors;
1088 pmbus_add_sensor(data, "curr", "max", in_index,
1089 0, PMBUS_IIN_OC_WARN_LIMIT,
1090 PSC_CURRENT_IN, false);
1091 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
1092 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1093 in_index,
1094 PB_STATUS_INPUT_BASE,
1095 PB_IIN_OC_WARNING);
1096 }
1097 }
1098 if (pmbus_check_word_register(client, 0,
1099 PMBUS_IIN_OC_FAULT_LIMIT)) {
1100 i1 = data->num_sensors;
1101 pmbus_add_sensor(data, "curr", "crit", in_index,
1102 0, PMBUS_IIN_OC_FAULT_LIMIT,
1103 PSC_CURRENT_IN, false);
1104 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1105 pmbus_add_boolean_reg(data, "curr",
1106 "crit_alarm",
1107 in_index,
1108 PB_STATUS_INPUT_BASE,
1109 PB_IIN_OC_FAULT);
1110 }
1111 in_index++;
1112 }
1113
1114 /*
1115 * Output current sensors
1116 */
1117 for (page = 0; page < info->pages; page++) {
1118 bool have_alarm = false;
1119
1120 if (!(info->func[page] & PMBUS_HAVE_IOUT))
1121 continue;
1122
1123 i0 = data->num_sensors;
1124 pmbus_add_label(data, "curr", in_index, "iout", page + 1);
1125 pmbus_add_sensor(data, "curr", "input", in_index, page,
1126 PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
1127 if (pmbus_check_word_register(client, page,
1128 PMBUS_IOUT_OC_WARN_LIMIT)) {
1129 i1 = data->num_sensors;
1130 pmbus_add_sensor(data, "curr", "max", in_index, page,
1131 PMBUS_IOUT_OC_WARN_LIMIT,
1132 PSC_CURRENT_OUT, false);
1133 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1134 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1135 in_index,
1136 PB_STATUS_IOUT_BASE +
1137 page, PB_IOUT_OC_WARNING);
1138 have_alarm = true;
1139 }
1140 }
1141 if (pmbus_check_word_register(client, page,
1142 PMBUS_IOUT_UC_FAULT_LIMIT)) {
1143 i1 = data->num_sensors;
1144 pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
1145 PMBUS_IOUT_UC_FAULT_LIMIT,
1146 PSC_CURRENT_OUT, false);
1147 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1148 pmbus_add_boolean_reg(data, "curr",
1149 "lcrit_alarm",
1150 in_index,
1151 PB_STATUS_IOUT_BASE +
1152 page, PB_IOUT_UC_FAULT);
1153 have_alarm = true;
1154 }
1155 }
1156 if (pmbus_check_word_register(client, page,
1157 PMBUS_IOUT_OC_FAULT_LIMIT)) {
1158 i1 = data->num_sensors;
1159 pmbus_add_sensor(data, "curr", "crit", in_index, page,
1160 PMBUS_IOUT_OC_FAULT_LIMIT,
1161 PSC_CURRENT_OUT, false);
1162 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1163 pmbus_add_boolean_reg(data, "curr",
1164 "crit_alarm",
1165 in_index,
1166 PB_STATUS_IOUT_BASE +
1167 page, PB_IOUT_OC_FAULT);
1168 have_alarm = true;
1169 }
1170 }
1171 /*
1172 * Add generic alarm attribute only if there are no individual
1173 * attributes.
1174 */
1175 if (!have_alarm)
1176 pmbus_add_boolean_reg(data, "curr", "alarm",
1177 in_index,
1178 PB_STATUS_BASE + page,
1179 PB_STATUS_IOUT_OC);
1180 in_index++;
1181 }
1182
1183 /*
1184 * Power sensors
1185 */
1186 /*
1187 * Input Power sensors
1188 */
1189 in_index = 1;
1190 if (info->func[0] & PMBUS_HAVE_PIN) {
1191 i0 = data->num_sensors;
1192 pmbus_add_label(data, "power", in_index, "pin", 0);
1193 pmbus_add_sensor(data, "power", "input", in_index,
1194 0, PMBUS_READ_PIN, PSC_POWER, true);
1195 if (pmbus_check_word_register(client, 0,
1196 PMBUS_PIN_OP_WARN_LIMIT)) {
1197 i1 = data->num_sensors;
1198 pmbus_add_sensor(data, "power", "max", in_index,
1199 0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
1200 false);
1201 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1202 pmbus_add_boolean_reg(data, "power",
1203 "alarm",
1204 in_index,
1205 PB_STATUS_INPUT_BASE,
1206 PB_PIN_OP_WARNING);
1207 }
1208 in_index++;
1209 }
1210
1211 /*
1212 * Output Power sensors
1213 */
1214 for (page = 0; page < info->pages; page++) {
1215 bool need_alarm = false;
1216
1217 if (!(info->func[page] & PMBUS_HAVE_POUT))
1218 continue;
1219
1220 i0 = data->num_sensors;
1221 pmbus_add_label(data, "power", in_index, "pout", page + 1);
1222 pmbus_add_sensor(data, "power", "input", in_index, page,
1223 PMBUS_READ_POUT, PSC_POWER, true);
1224 /*
1225 * Per hwmon sysfs API, power_cap is to be used to limit output
1226 * power.
1227 * We have two registers related to maximum output power,
1228 * PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
1229 * PMBUS_POUT_MAX matches the powerX_cap attribute definition.
1230 * There is no attribute in the API to match
1231 * PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
1232 */
1233 if (pmbus_check_word_register(client, page, PMBUS_POUT_MAX)) {
1234 i1 = data->num_sensors;
1235 pmbus_add_sensor(data, "power", "cap", in_index, page,
1236 PMBUS_POUT_MAX, PSC_POWER, false);
1237 need_alarm = true;
1238 }
1239 if (pmbus_check_word_register(client, page,
1240 PMBUS_POUT_OP_WARN_LIMIT)) {
1241 i1 = data->num_sensors;
1242 pmbus_add_sensor(data, "power", "max", in_index, page,
1243 PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
1244 false);
1245 need_alarm = true;
1246 }
1247 if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
1248 pmbus_add_boolean_reg(data, "power", "alarm",
1249 in_index,
1250 PB_STATUS_IOUT_BASE + page,
1251 PB_POUT_OP_WARNING
1252 | PB_POWER_LIMITING);
1253
1254 if (pmbus_check_word_register(client, page,
1255 PMBUS_POUT_OP_FAULT_LIMIT)) {
1256 i1 = data->num_sensors;
1257 pmbus_add_sensor(data, "power", "crit", in_index, page,
1258 PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
1259 false);
1260 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
1261 pmbus_add_boolean_reg(data, "power",
1262 "crit_alarm",
1263 in_index,
1264 PB_STATUS_IOUT_BASE
1265 + page,
1266 PB_POUT_OP_FAULT);
1267 }
1268 in_index++;
1269 }
1270
1271 /*
1272 * Temperature sensors
1273 */
1274 in_index = 1;
1275 for (page = 0; page < info->pages; page++) {
1276 int t, temps;
1277
1278 if (!(info->func[page] & PMBUS_HAVE_TEMP))
1279 continue;
1280
1281 temps = page ? 1 : ARRAY_SIZE(pmbus_temp_registers);
1282 for (t = 0; t < temps; t++) {
1283 bool have_alarm = false;
1284
1285 if (!pmbus_check_word_register
1286 (client, page, pmbus_temp_registers[t]))
1287 break;
1288
1289 i0 = data->num_sensors;
1290 pmbus_add_sensor(data, "temp", "input", in_index, page,
1291 pmbus_temp_registers[t],
1292 PSC_TEMPERATURE, true);
1293
1294 /*
1295 * PMBus provides only one status register for TEMP1-3.
1296 * Thus, we can not use the status register to determine
1297 * which of the three sensors actually caused an alarm.
1298 * Always compare current temperature against the limit
1299 * registers to determine alarm conditions for a
1300 * specific sensor.
1301 */
1302 if (pmbus_check_word_register
1303 (client, page, PMBUS_UT_WARN_LIMIT)) {
1304 i1 = data->num_sensors;
1305 pmbus_add_sensor(data, "temp", "min", in_index,
1306 page, PMBUS_UT_WARN_LIMIT,
1307 PSC_TEMPERATURE, false);
1308 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1309 pmbus_add_boolean_cmp(data, "temp",
1310 "min_alarm", in_index, i1, i0,
1311 PB_STATUS_TEMP_BASE + page,
1312 PB_TEMP_UT_WARNING);
1313 have_alarm = true;
1314 }
1315 }
1316 if (pmbus_check_word_register(client, page,
1317 PMBUS_UT_FAULT_LIMIT)) {
1318 i1 = data->num_sensors;
1319 pmbus_add_sensor(data, "temp", "lcrit",
1320 in_index, page,
1321 PMBUS_UT_FAULT_LIMIT,
1322 PSC_TEMPERATURE, false);
1323 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1324 pmbus_add_boolean_cmp(data, "temp",
1325 "lcrit_alarm", in_index, i1, i0,
1326 PB_STATUS_TEMP_BASE + page,
1327 PB_TEMP_UT_FAULT);
1328 have_alarm = true;
1329 }
1330 }
1331 if (pmbus_check_word_register
1332 (client, page, PMBUS_OT_WARN_LIMIT)) {
1333 i1 = data->num_sensors;
1334 pmbus_add_sensor(data, "temp", "max", in_index,
1335 page, PMBUS_OT_WARN_LIMIT,
1336 PSC_TEMPERATURE, false);
1337 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1338 pmbus_add_boolean_cmp(data, "temp",
1339 "max_alarm", in_index, i0, i1,
1340 PB_STATUS_TEMP_BASE + page,
1341 PB_TEMP_OT_WARNING);
1342 have_alarm = true;
1343 }
1344 }
1345 if (pmbus_check_word_register(client, page,
1346 PMBUS_OT_FAULT_LIMIT)) {
1347 i1 = data->num_sensors;
1348 pmbus_add_sensor(data, "temp", "crit", in_index,
1349 page, PMBUS_OT_FAULT_LIMIT,
1350 PSC_TEMPERATURE, false);
1351 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1352 pmbus_add_boolean_cmp(data, "temp",
1353 "crit_alarm", in_index, i0, i1,
1354 PB_STATUS_TEMP_BASE + page,
1355 PB_TEMP_OT_FAULT);
1356 have_alarm = true;
1357 }
1358 }
1359 /*
1360 * Last resort - we were not able to create any alarm
1361 * registers. Report alarm for all sensors using the
1362 * status register temperature alarm bit.
1363 */
1364 if (!have_alarm)
1365 pmbus_add_boolean_reg(data, "temp", "alarm",
1366 in_index,
1367 PB_STATUS_BASE + page,
1368 PB_STATUS_TEMPERATURE);
1369 in_index++;
1370 }
1371 }
1372
1373 /*
1374 * Fans
1375 */
1376 in_index = 1;
1377 for (page = 0; page < info->pages; page++) {
954df676 1378 int f;
442aba78 1379
954df676 1380 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
442aba78
GR		 1381 int regval;
1382
954df676
GR		 1383 if (!(info->func[page] & pmbus_fan_flags[f]))
1384 break;
1385
442aba78
GR		 1386 if (!pmbus_check_word_register(client, page,
1387 pmbus_fan_registers[f])
1388 || !pmbus_check_byte_register(client, page,
1389 pmbus_fan_config_registers[f]))
1390 break;
1391
1392 /*
1393 * Skip fan if not installed.
1394 * Each fan configuration register covers multiple fans,
1395 * so we have to do some magic.
1396 */
1397 regval = pmbus_read_byte_data(client, page,
1398 pmbus_fan_config_registers[f]);
1399 if (regval < 0 ||
1400 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1401 continue;
1402
1403 i0 = data->num_sensors;
1404 pmbus_add_sensor(data, "fan", "input", in_index, page,
1405 pmbus_fan_registers[f], PSC_FAN, true);
1406
1407 /*
1408 * Each fan status register covers multiple fans,
1409 * so we have to do some magic.
1410 */
954df676
GR		 1411 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1412 pmbus_check_byte_register(client,
1413 page, pmbus_fan_status_registers[f])) {
442aba78
GR		 1414 int base;
1415
1416 if (f > 1) /* fan 3, 4 */
954df676 1417 base = PB_STATUS_FAN34_BASE + page;
442aba78
GR		 1418 else
1419 base = PB_STATUS_FAN_BASE + page;
1420 pmbus_add_boolean_reg(data, "fan", "alarm",
1421 in_index, base,
1422 PB_FAN_FAN1_WARNING >> (f & 1));
1423 pmbus_add_boolean_reg(data, "fan", "fault",
1424 in_index, base,
1425 PB_FAN_FAN1_FAULT >> (f & 1));
1426 }
1427 in_index++;
1428 }
1429 }
1430}
1431
1432/*
1433 * Identify chip parameters.
1434 * This function is called for all chips.
1435 */
1436static int pmbus_identify_common(struct i2c_client *client,
1437 struct pmbus_data *data)
1438{
83274c68 1439 int vout_mode = -1, exponent;
442aba78 1440
83274c68
GR		 1441 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1442 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1443 if (vout_mode >= 0 && vout_mode != 0xff) {
442aba78
GR		 1444 /*
1445 * Not all chips support the VOUT_MODE command,
1446 * so a failure to read it is not an error.
1447 */
1448 switch (vout_mode >> 5) {
1449 case 0: /* linear mode */
1450 if (data->info->direct[PSC_VOLTAGE_OUT])
1451 return -ENODEV;
1452
1453 exponent = vout_mode & 0x1f;
1454 /* and sign-extend it */
1455 if (exponent & 0x10)
1456 exponent |= ~0x1f;
1457 data->exponent = exponent;
1458 break;
1459 case 2: /* direct mode */
1460 if (!data->info->direct[PSC_VOLTAGE_OUT])
1461 return -ENODEV;
1462 break;
1463 default:
1464 return -ENODEV;
1465 }
1466 }
1467
1468 /* Determine maximum number of sensors, booleans, and labels */
1469 pmbus_find_max_attr(client, data);
1470 pmbus_clear_fault_page(client, 0);
1471 return 0;
1472}
1473
1474int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1475 struct pmbus_driver_info *info)
1476{
1477 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1478 struct pmbus_data *data;
1479 int ret;
1480
1481 if (!info) {
1482 dev_err(&client->dev, "Missing chip information");
1483 return -ENODEV;
1484 }
1485
1486 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1487 | I2C_FUNC_SMBUS_BYTE_DATA
1488 | I2C_FUNC_SMBUS_WORD_DATA))
1489 return -ENODEV;
1490
1491 data = kzalloc(sizeof(*data), GFP_KERNEL);
1492 if (!data) {
1493 dev_err(&client->dev, "No memory to allocate driver data\n");
1494 return -ENOMEM;
1495 }
1496
1497 i2c_set_clientdata(client, data);
1498 mutex_init(&data->update_lock);
1499
1500 /*
1501 * Bail out if status register or PMBus revision register
1502 * does not exist.
1503 */
1504 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
1505 || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
1506 dev_err(&client->dev,
1507 "Status or revision register not found\n");
1508 ret = -ENODEV;
1509 goto out_data;
1510 }
1511
1512 if (pdata)
1513 data->flags = pdata->flags;
1514 data->info = info;
1515
1516 pmbus_clear_faults(client);
1517
1518 if (info->identify) {
1519 ret = (*info->identify)(client, info);
1520 if (ret < 0) {
1521 dev_err(&client->dev, "Chip identification failed\n");
1522 goto out_data;
1523 }
1524 }
1525
1526 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1527 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1528 info->pages);
1529 ret = -EINVAL;
1530 goto out_data;
1531 }
1532 /*
1533 * Bail out if more than one page was configured, but we can not
1534 * select the highest page. This is an indication that the wrong
1535 * chip type was selected. Better bail out now than keep
1536 * returning errors later on.
1537 */
1538 if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
1539 dev_err(&client->dev, "Failed to select page %d\n",
1540 info->pages - 1);
1541 ret = -EINVAL;
1542 goto out_data;
1543 }
1544
1545 ret = pmbus_identify_common(client, data);
1546 if (ret < 0) {
1547 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1548 goto out_data;
1549 }
1550
1551 ret = -ENOMEM;
1552 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1553 GFP_KERNEL);
1554 if (!data->sensors) {
1555 dev_err(&client->dev, "No memory to allocate sensor data\n");
1556 goto out_data;
1557 }
1558
1559 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1560 * data->max_booleans, GFP_KERNEL);
1561 if (!data->booleans) {
1562 dev_err(&client->dev, "No memory to allocate boolean data\n");
1563 goto out_sensors;
1564 }
1565
1566 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1567 GFP_KERNEL);
1568 if (!data->labels) {
1569 dev_err(&client->dev, "No memory to allocate label data\n");
1570 goto out_booleans;
1571 }
1572
1573 data->attributes = kzalloc(sizeof(struct attribute *)
1574 * data->max_attributes, GFP_KERNEL);
1575 if (!data->attributes) {
1576 dev_err(&client->dev, "No memory to allocate attribute data\n");
1577 goto out_labels;
1578 }
1579
1580 pmbus_find_attributes(client, data);
1581
1582 /*
1583 * If there are no attributes, something is wrong.
1584 * Bail out instead of trying to register nothing.
1585 */
1586 if (!data->num_attributes) {
1587 dev_err(&client->dev, "No attributes found\n");
1588 ret = -ENODEV;
1589 goto out_attributes;
1590 }
1591
1592 /* Register sysfs hooks */
1593 data->group.attrs = data->attributes;
1594 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1595 if (ret) {
1596 dev_err(&client->dev, "Failed to create sysfs entries\n");
1597 goto out_attributes;
1598 }
1599 data->hwmon_dev = hwmon_device_register(&client->dev);
1600 if (IS_ERR(data->hwmon_dev)) {
1601 ret = PTR_ERR(data->hwmon_dev);
1602 dev_err(&client->dev, "Failed to register hwmon device\n");
1603 goto out_hwmon_device_register;
1604 }
1605 return 0;
1606
1607out_hwmon_device_register:
1608 sysfs_remove_group(&client->dev.kobj, &data->group);
1609out_attributes:
1610 kfree(data->attributes);
1611out_labels:
1612 kfree(data->labels);
1613out_booleans:
1614 kfree(data->booleans);
1615out_sensors:
1616 kfree(data->sensors);
1617out_data:
1618 kfree(data);
1619 return ret;
1620}
1621EXPORT_SYMBOL_GPL(pmbus_do_probe);
1622
1623int pmbus_do_remove(struct i2c_client *client)
1624{
1625 struct pmbus_data *data = i2c_get_clientdata(client);
1626 hwmon_device_unregister(data->hwmon_dev);
1627 sysfs_remove_group(&client->dev.kobj, &data->group);
1628 kfree(data->attributes);
1629 kfree(data->labels);
1630 kfree(data->booleans);
1631 kfree(data->sensors);
1632 kfree(data);
1633 return 0;
1634}
1635EXPORT_SYMBOL_GPL(pmbus_do_remove);
1636
1637MODULE_AUTHOR("Guenter Roeck");
1638MODULE_DESCRIPTION("PMBus core driver");
1639MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)