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usb-xhci: Handle COMP_TX_ERR for isoc tds
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / pmbus_core.c
blobffa54dd7dbdabca339126286a203531a245ba9ea
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 3 /* cap_alarm, alarm, crit_alarm
54 */
55 #define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
56 #define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
57 lcrit_alarm, crit_alarm */
58
59 #define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
60
61 /*
62 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
63 * are paged. status_input is unpaged.
64 */
65 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
66
67 /*
68 * Index into status register array, per status register group
69 */
70 #define PB_STATUS_BASE 0
71 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
72 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
73 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
74 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
75 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
76 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
77
78 struct pmbus_sensor {
79 char name[I2C_NAME_SIZE]; /* sysfs sensor name */
80 struct sensor_device_attribute attribute;
81 u8 page; /* page number */
82 u8 reg; /* register */
83 enum pmbus_sensor_classes class; /* sensor class */
84 bool update; /* runtime sensor update needed */
85 int data; /* Sensor data.
86 Negative if there was a read error */
87 };
88
89 struct pmbus_boolean {
90 char name[I2C_NAME_SIZE]; /* sysfs boolean name */
91 struct sensor_device_attribute attribute;
92 };
93
94 struct pmbus_label {
95 char name[I2C_NAME_SIZE]; /* sysfs label name */
96 struct sensor_device_attribute attribute;
97 char label[I2C_NAME_SIZE]; /* label */
98 };
99
100 struct pmbus_data {
101 struct device *hwmon_dev;
102
103 u32 flags; /* from platform data */
104
105 int exponent; /* linear mode: exponent for output voltages */
106
107 const struct pmbus_driver_info *info;
108
109 int max_attributes;
110 int num_attributes;
111 struct attribute **attributes;
112 struct attribute_group group;
113
114 /*
115 * Sensors cover both sensor and limit registers.
116 */
117 int max_sensors;
118 int num_sensors;
119 struct pmbus_sensor *sensors;
120 /*
121 * Booleans are used for alarms.
122 * Values are determined from status registers.
123 */
124 int max_booleans;
125 int num_booleans;
126 struct pmbus_boolean *booleans;
127 /*
128 * Labels are used to map generic names (e.g., "in1")
129 * to PMBus specific names (e.g., "vin" or "vout1").
130 */
131 int max_labels;
132 int num_labels;
133 struct pmbus_label *labels;
134
135 struct mutex update_lock;
136 bool valid;
137 unsigned long last_updated; /* in jiffies */
138
139 /*
140 * A single status register covers multiple attributes,
141 * so we keep them all together.
142 */
143 u8 status[PB_NUM_STATUS_REG];
144
145 u8 currpage;
146 };
147
148 int 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 }
164 EXPORT_SYMBOL_GPL(pmbus_set_page);
165
166 static 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
177 static 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
189 int 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 }
199 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
200
201 static 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
212 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
213 {
214 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
215 }
216
217 void 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 }
225 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
226
227 static 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
240 bool 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 }
251 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
252
253 bool 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 }
264 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
265
266 const 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 }
272 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
273
274 /*
275 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
276 * a device specific mapping funcion exists and calls it if necessary.
277 */
278 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
279 {
280 struct pmbus_data *data = i2c_get_clientdata(client);
281 const struct pmbus_driver_info *info = data->info;
282 int status;
283
284 if (info->read_byte_data) {
285 status = info->read_byte_data(client, page, reg);
286 if (status != -ENODATA)
287 return status;
288 }
289 return pmbus_read_byte_data(client, page, reg);
290 }
291
292 static struct pmbus_data *pmbus_update_device(struct device *dev)
293 {
294 struct i2c_client *client = to_i2c_client(dev);
295 struct pmbus_data *data = i2c_get_clientdata(client);
296 const struct pmbus_driver_info *info = data->info;
297
298 mutex_lock(&data->update_lock);
299 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
300 int i;
301
302 for (i = 0; i < info->pages; i++)
303 data->status[PB_STATUS_BASE + i]
304 = pmbus_read_byte_data(client, i,
305 PMBUS_STATUS_BYTE);
306 for (i = 0; i < info->pages; i++) {
307 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
308 continue;
309 data->status[PB_STATUS_VOUT_BASE + i]
310 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_VOUT);
311 }
312 for (i = 0; i < info->pages; i++) {
313 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
314 continue;
315 data->status[PB_STATUS_IOUT_BASE + i]
316 = _pmbus_read_byte_data(client, i, PMBUS_STATUS_IOUT);
317 }
318 for (i = 0; i < info->pages; i++) {
319 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
320 continue;
321 data->status[PB_STATUS_TEMP_BASE + i]
322 = _pmbus_read_byte_data(client, i,
323 PMBUS_STATUS_TEMPERATURE);
324 }
325 for (i = 0; i < info->pages; i++) {
326 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
327 continue;
328 data->status[PB_STATUS_FAN_BASE + i]
329 = _pmbus_read_byte_data(client, i,
330 PMBUS_STATUS_FAN_12);
331 }
332
333 for (i = 0; i < info->pages; i++) {
334 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
335 continue;
336 data->status[PB_STATUS_FAN34_BASE + i]
337 = _pmbus_read_byte_data(client, i,
338 PMBUS_STATUS_FAN_34);
339 }
340
341 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
342 data->status[PB_STATUS_INPUT_BASE]
343 = _pmbus_read_byte_data(client, 0,
344 PMBUS_STATUS_INPUT);
345
346 for (i = 0; i < data->num_sensors; i++) {
347 struct pmbus_sensor *sensor = &data->sensors[i];
348
349 if (!data->valid || sensor->update)
350 sensor->data
351 = pmbus_read_word_data(client, sensor->page,
352 sensor->reg);
353 }
354 pmbus_clear_faults(client);
355 data->last_updated = jiffies;
356 data->valid = 1;
357 }
358 mutex_unlock(&data->update_lock);
359 return data;
360 }
361
362 /*
363 * Convert linear sensor values to milli- or micro-units
364 * depending on sensor type.
365 */
366 static long pmbus_reg2data_linear(struct pmbus_data *data,
367 struct pmbus_sensor *sensor)
368 {
369 s16 exponent;
370 s32 mantissa;
371 long val;
372
373 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
374 exponent = data->exponent;
375 mantissa = (u16) sensor->data;
376 } else { /* LINEAR11 */
377 exponent = (sensor->data >> 11) & 0x001f;
378 mantissa = sensor->data & 0x07ff;
379
380 if (exponent > 0x0f)
381 exponent |= 0xffe0; /* sign extend exponent */
382 if (mantissa > 0x03ff)
383 mantissa |= 0xfffff800; /* sign extend mantissa */
384 }
385
386 val = mantissa;
387
388 /* scale result to milli-units for all sensors except fans */
389 if (sensor->class != PSC_FAN)
390 val = val * 1000L;
391
392 /* scale result to micro-units for power sensors */
393 if (sensor->class == PSC_POWER)
394 val = val * 1000L;
395
396 if (exponent >= 0)
397 val <<= exponent;
398 else
399 val >>= -exponent;
400
401 return val;
402 }
403
404 /*
405 * Convert direct sensor values to milli- or micro-units
406 * depending on sensor type.
407 */
408 static long pmbus_reg2data_direct(struct pmbus_data *data,
409 struct pmbus_sensor *sensor)
410 {
411 long val = (s16) sensor->data;
412 long m, b, R;
413
414 m = data->info->m[sensor->class];
415 b = data->info->b[sensor->class];
416 R = data->info->R[sensor->class];
417
418 if (m == 0)
419 return 0;
420
421 /* X = 1/m * (Y * 10^-R - b) */
422 R = -R;
423 /* scale result to milli-units for everything but fans */
424 if (sensor->class != PSC_FAN) {
425 R += 3;
426 b *= 1000;
427 }
428
429 /* scale result to micro-units for power sensors */
430 if (sensor->class == PSC_POWER) {
431 R += 3;
432 b *= 1000;
433 }
434
435 while (R > 0) {
436 val *= 10;
437 R--;
438 }
439 while (R < 0) {
440 val = DIV_ROUND_CLOSEST(val, 10);
441 R++;
442 }
443
444 return (val - b) / m;
445 }
446
447 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
448 {
449 long val;
450
451 if (data->info->direct[sensor->class])
452 val = pmbus_reg2data_direct(data, sensor);
453 else
454 val = pmbus_reg2data_linear(data, sensor);
455
456 return val;
457 }
458
459 #define MAX_MANTISSA (1023 * 1000)
460 #define MIN_MANTISSA (511 * 1000)
461
462 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
463 enum pmbus_sensor_classes class, long val)
464 {
465 s16 exponent = 0, mantissa;
466 bool negative = false;
467
468 /* simple case */
469 if (val == 0)
470 return 0;
471
472 if (class == PSC_VOLTAGE_OUT) {
473 /* LINEAR16 does not support negative voltages */
474 if (val < 0)
475 return 0;
476
477 /*
478 * For a static exponents, we don't have a choice
479 * but to adjust the value to it.
480 */
481 if (data->exponent < 0)
482 val <<= -data->exponent;
483 else
484 val >>= data->exponent;
485 val = DIV_ROUND_CLOSEST(val, 1000);
486 return val & 0xffff;
487 }
488
489 if (val < 0) {
490 negative = true;
491 val = -val;
492 }
493
494 /* Power is in uW. Convert to mW before converting. */
495 if (class == PSC_POWER)
496 val = DIV_ROUND_CLOSEST(val, 1000L);
497
498 /*
499 * For simplicity, convert fan data to milli-units
500 * before calculating the exponent.
501 */
502 if (class == PSC_FAN)
503 val = val * 1000;
504
505 /* Reduce large mantissa until it fits into 10 bit */
506 while (val >= MAX_MANTISSA && exponent < 15) {
507 exponent++;
508 val >>= 1;
509 }
510 /* Increase small mantissa to improve precision */
511 while (val < MIN_MANTISSA && exponent > -15) {
512 exponent--;
513 val <<= 1;
514 }
515
516 /* Convert mantissa from milli-units to units */
517 mantissa = DIV_ROUND_CLOSEST(val, 1000);
518
519 /* Ensure that resulting number is within range */
520 if (mantissa > 0x3ff)
521 mantissa = 0x3ff;
522
523 /* restore sign */
524 if (negative)
525 mantissa = -mantissa;
526
527 /* Convert to 5 bit exponent, 11 bit mantissa */
528 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
529 }
530
531 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
532 enum pmbus_sensor_classes class, long val)
533 {
534 long m, b, R;
535
536 m = data->info->m[class];
537 b = data->info->b[class];
538 R = data->info->R[class];
539
540 /* Power is in uW. Adjust R and b. */
541 if (class == PSC_POWER) {
542 R -= 3;
543 b *= 1000;
544 }
545
546 /* Calculate Y = (m * X + b) * 10^R */
547 if (class != PSC_FAN) {
548 R -= 3; /* Adjust R and b for data in milli-units */
549 b *= 1000;
550 }
551 val = val * m + b;
552
553 while (R > 0) {
554 val *= 10;
555 R--;
556 }
557 while (R < 0) {
558 val = DIV_ROUND_CLOSEST(val, 10);
559 R++;
560 }
561
562 return val;
563 }
564
565 static u16 pmbus_data2reg(struct pmbus_data *data,
566 enum pmbus_sensor_classes class, long val)
567 {
568 u16 regval;
569
570 if (data->info->direct[class])
571 regval = pmbus_data2reg_direct(data, class, val);
572 else
573 regval = pmbus_data2reg_linear(data, class, val);
574
575 return regval;
576 }
577
578 /*
579 * Return boolean calculated from converted data.
580 * <index> defines a status register index and mask, and optionally
581 * two sensor indexes.
582 * The upper half-word references the two sensors,
583 * two sensor indices.
584 * The upper half-word references the two optional sensors,
585 * the lower half word references status register and mask.
586 * The function returns true if (status[reg] & mask) is true and,
587 * if specified, if v1 >= v2.
588 * To determine if an object exceeds upper limits, specify <v, limit>.
589 * To determine if an object exceeds lower limits, specify <limit, v>.
590 *
591 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
592 * index are set. s1 and s2 (the sensor index values) are zero in this case.
593 * The function returns true if (status[reg] & mask) is true.
594 *
595 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
596 * a specified limit has to be performed to determine the boolean result.
597 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
598 * sensor values referenced by sensor indices s1 and s2).
599 *
600 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
601 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
602 *
603 * If a negative value is stored in any of the referenced registers, this value
604 * reflects an error code which will be returned.
605 */
606 static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
607 {
608 u8 s1 = (index >> 24) & 0xff;
609 u8 s2 = (index >> 16) & 0xff;
610 u8 reg = (index >> 8) & 0xff;
611 u8 mask = index & 0xff;
612 int status;
613 u8 regval;
614
615 status = data->status[reg];
616 if (status < 0)
617 return status;
618
619 regval = status & mask;
620 if (!s1 && !s2)
621 *val = !!regval;
622 else {
623 long v1, v2;
624 struct pmbus_sensor *sensor1, *sensor2;
625
626 sensor1 = &data->sensors[s1];
627 if (sensor1->data < 0)
628 return sensor1->data;
629 sensor2 = &data->sensors[s2];
630 if (sensor2->data < 0)
631 return sensor2->data;
632
633 v1 = pmbus_reg2data(data, sensor1);
634 v2 = pmbus_reg2data(data, sensor2);
635 *val = !!(regval && v1 >= v2);
636 }
637 return 0;
638 }
639
640 static ssize_t pmbus_show_boolean(struct device *dev,
641 struct device_attribute *da, char *buf)
642 {
643 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
644 struct pmbus_data *data = pmbus_update_device(dev);
645 int val;
646 int err;
647
648 err = pmbus_get_boolean(data, attr->index, &val);
649 if (err)
650 return err;
651 return snprintf(buf, PAGE_SIZE, "%d\n", val);
652 }
653
654 static ssize_t pmbus_show_sensor(struct device *dev,
655 struct device_attribute *da, char *buf)
656 {
657 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
658 struct pmbus_data *data = pmbus_update_device(dev);
659 struct pmbus_sensor *sensor;
660
661 sensor = &data->sensors[attr->index];
662 if (sensor->data < 0)
663 return sensor->data;
664
665 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
666 }
667
668 static ssize_t pmbus_set_sensor(struct device *dev,
669 struct device_attribute *devattr,
670 const char *buf, size_t count)
671 {
672 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
673 struct i2c_client *client = to_i2c_client(dev);
674 struct pmbus_data *data = i2c_get_clientdata(client);
675 struct pmbus_sensor *sensor = &data->sensors[attr->index];
676 ssize_t rv = count;
677 long val = 0;
678 int ret;
679 u16 regval;
680
681 if (strict_strtol(buf, 10, &val) < 0)
682 return -EINVAL;
683
684 mutex_lock(&data->update_lock);
685 regval = pmbus_data2reg(data, sensor->class, val);
686 ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
687 if (ret < 0)
688 rv = ret;
689 else
690 data->sensors[attr->index].data = regval;
691 mutex_unlock(&data->update_lock);
692 return rv;
693 }
694
695 static ssize_t pmbus_show_label(struct device *dev,
696 struct device_attribute *da, char *buf)
697 {
698 struct i2c_client *client = to_i2c_client(dev);
699 struct pmbus_data *data = i2c_get_clientdata(client);
700 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
701
702 return snprintf(buf, PAGE_SIZE, "%s\n",
703 data->labels[attr->index].label);
704 }
705
706 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
707 do { \
708 struct sensor_device_attribute *a \
709 = &data->_type##s[data->num_##_type##s].attribute; \
710 BUG_ON(data->num_attributes >= data->max_attributes); \
711 sysfs_attr_init(&a->dev_attr.attr); \
712 a->dev_attr.attr.name = _name; \
713 a->dev_attr.attr.mode = _mode; \
714 a->dev_attr.show = _show; \
715 a->dev_attr.store = _set; \
716 a->index = _idx; \
717 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
718 data->num_attributes++; \
719 } while (0)
720
721 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
722 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
723 pmbus_show_##_type, NULL)
724
725 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
726 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
727 pmbus_show_##_type, pmbus_set_##_type)
728
729 static void pmbus_add_boolean(struct pmbus_data *data,
730 const char *name, const char *type, int seq,
731 int idx)
732 {
733 struct pmbus_boolean *boolean;
734
735 BUG_ON(data->num_booleans >= data->max_booleans);
736
737 boolean = &data->booleans[data->num_booleans];
738
739 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
740 name, seq, type);
741 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
742 data->num_booleans++;
743 }
744
745 static void pmbus_add_boolean_reg(struct pmbus_data *data,
746 const char *name, const char *type,
747 int seq, int reg, int bit)
748 {
749 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
750 }
751
752 static void pmbus_add_boolean_cmp(struct pmbus_data *data,
753 const char *name, const char *type,
754 int seq, int i1, int i2, int reg, int mask)
755 {
756 pmbus_add_boolean(data, name, type, seq,
757 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
758 }
759
760 static void pmbus_add_sensor(struct pmbus_data *data,
761 const char *name, const char *type, int seq,
762 int page, int reg, enum pmbus_sensor_classes class,
763 bool update, bool readonly)
764 {
765 struct pmbus_sensor *sensor;
766
767 BUG_ON(data->num_sensors >= data->max_sensors);
768
769 sensor = &data->sensors[data->num_sensors];
770 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
771 name, seq, type);
772 sensor->page = page;
773 sensor->reg = reg;
774 sensor->class = class;
775 sensor->update = update;
776 if (readonly)
777 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
778 data->num_sensors);
779 else
780 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
781 data->num_sensors);
782 data->num_sensors++;
783 }
784
785 static void pmbus_add_label(struct pmbus_data *data,
786 const char *name, int seq,
787 const char *lstring, int index)
788 {
789 struct pmbus_label *label;
790
791 BUG_ON(data->num_labels >= data->max_labels);
792
793 label = &data->labels[data->num_labels];
794 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
795 if (!index)
796 strncpy(label->label, lstring, sizeof(label->label) - 1);
797 else
798 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
799 index);
800
801 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
802 data->num_labels++;
803 }
804
805 /*
806 * Determine maximum number of sensors, booleans, and labels.
807 * To keep things simple, only make a rough high estimate.
808 */
809 static void pmbus_find_max_attr(struct i2c_client *client,
810 struct pmbus_data *data)
811 {
812 const struct pmbus_driver_info *info = data->info;
813 int page, max_sensors, max_booleans, max_labels;
814
815 max_sensors = PMBUS_MAX_INPUT_SENSORS;
816 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
817 max_labels = PMBUS_MAX_INPUT_LABELS;
818
819 for (page = 0; page < info->pages; page++) {
820 if (info->func[page] & PMBUS_HAVE_VOUT) {
821 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
822 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
823 max_labels++;
824 }
825 if (info->func[page] & PMBUS_HAVE_IOUT) {
826 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
827 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
828 max_labels++;
829 }
830 if (info->func[page] & PMBUS_HAVE_POUT) {
831 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
832 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
833 max_labels++;
834 }
835 if (info->func[page] & PMBUS_HAVE_FAN12) {
836 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
837 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
838 }
839 if (info->func[page] & PMBUS_HAVE_FAN34) {
840 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
841 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
842 }
843 if (info->func[page] & PMBUS_HAVE_TEMP) {
844 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
845 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
846 }
847 if (info->func[page] & PMBUS_HAVE_TEMP2) {
848 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
849 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
850 }
851 if (info->func[page] & PMBUS_HAVE_TEMP3) {
852 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
853 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
854 }
855 }
856 data->max_sensors = max_sensors;
857 data->max_booleans = max_booleans;
858 data->max_labels = max_labels;
859 data->max_attributes = max_sensors + max_booleans + max_labels;
860 }
861
862 /*
863 * Search for attributes. Allocate sensors, booleans, and labels as needed.
864 */
865
866 /*
867 * The pmbus_limit_attr structure describes a single limit attribute
868 * and its associated alarm attribute.
869 */
870 struct pmbus_limit_attr {
871 u8 reg; /* Limit register */
872 const char *attr; /* Attribute name */
873 const char *alarm; /* Alarm attribute name */
874 u32 sbit; /* Alarm attribute status bit */
875 };
876
877 /*
878 * The pmbus_sensor_attr structure describes one sensor attribute. This
879 * description includes a reference to the associated limit attributes.
880 */
881 struct pmbus_sensor_attr {
882 u8 reg; /* sensor register */
883 enum pmbus_sensor_classes class;/* sensor class */
884 const char *label; /* sensor label */
885 bool paged; /* true if paged sensor */
886 bool update; /* true if update needed */
887 bool compare; /* true if compare function needed */
888 u32 func; /* sensor mask */
889 u32 sfunc; /* sensor status mask */
890 int sbase; /* status base register */
891 u32 gbit; /* generic status bit */
892 const struct pmbus_limit_attr *limit;/* limit registers */
893 int nlimit; /* # of limit registers */
894 };
895
896 /*
897 * Add a set of limit attributes and, if supported, the associated
898 * alarm attributes.
899 */
900 static bool pmbus_add_limit_attrs(struct i2c_client *client,
901 struct pmbus_data *data,
902 const struct pmbus_driver_info *info,
903 const char *name, int index, int page,
904 int cbase,
905 const struct pmbus_sensor_attr *attr)
906 {
907 const struct pmbus_limit_attr *l = attr->limit;
908 int nlimit = attr->nlimit;
909 bool have_alarm = false;
910 int i, cindex;
911
912 for (i = 0; i < nlimit; i++) {
913 if (pmbus_check_word_register(client, page, l->reg)) {
914 cindex = data->num_sensors;
915 pmbus_add_sensor(data, name, l->attr, index, page,
916 l->reg, attr->class, attr->update,
917 false);
918 if (info->func[page] & attr->sfunc) {
919 if (attr->compare) {
920 pmbus_add_boolean_cmp(data, name,
921 l->alarm, index,
922 cbase, cindex,
923 attr->sbase + page, l->sbit);
924 } else {
925 pmbus_add_boolean_reg(data, name,
926 l->alarm, index,
927 attr->sbase + page, l->sbit);
928 }
929 have_alarm = true;
930 }
931 }
932 l++;
933 }
934 return have_alarm;
935 }
936
937 static void pmbus_add_sensor_attrs_one(struct i2c_client *client,
938 struct pmbus_data *data,
939 const struct pmbus_driver_info *info,
940 const char *name,
941 int index, int page,
942 const struct pmbus_sensor_attr *attr)
943 {
944 bool have_alarm;
945 int cbase = data->num_sensors;
946
947 if (attr->label)
948 pmbus_add_label(data, name, index, attr->label,
949 attr->paged ? page + 1 : 0);
950 pmbus_add_sensor(data, name, "input", index, page, attr->reg,
951 attr->class, true, true);
952 if (attr->sfunc) {
953 have_alarm = pmbus_add_limit_attrs(client, data, info, name,
954 index, page, cbase, attr);
955 /*
956 * Add generic alarm attribute only if there are no individual
957 * alarm attributes, and if there is a global alarm bit.
958 */
959 if (!have_alarm && attr->gbit)
960 pmbus_add_boolean_reg(data, name, "alarm", index,
961 PB_STATUS_BASE + page,
962 attr->gbit);
963 }
964 }
965
966 static void pmbus_add_sensor_attrs(struct i2c_client *client,
967 struct pmbus_data *data,
968 const char *name,
969 const struct pmbus_sensor_attr *attrs,
970 int nattrs)
971 {
972 const struct pmbus_driver_info *info = data->info;
973 int index, i;
974
975 index = 1;
976 for (i = 0; i < nattrs; i++) {
977 int page, pages;
978
979 pages = attrs->paged ? info->pages : 1;
980 for (page = 0; page < pages; page++) {
981 if (!(info->func[page] & attrs->func))
982 continue;
983 pmbus_add_sensor_attrs_one(client, data, info, name,
984 index, page, attrs);
985 index++;
986 }
987 attrs++;
988 }
989 }
990
991 static const struct pmbus_limit_attr vin_limit_attrs[] = {
992 {
993 .reg = PMBUS_VIN_UV_WARN_LIMIT,
994 .attr = "min",
995 .alarm = "min_alarm",
996 .sbit = PB_VOLTAGE_UV_WARNING,
997 }, {
998 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
999 .attr = "lcrit",
1000 .alarm = "lcrit_alarm",
1001 .sbit = PB_VOLTAGE_UV_FAULT,
1002 }, {
1003 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1004 .attr = "max",
1005 .alarm = "max_alarm",
1006 .sbit = PB_VOLTAGE_OV_WARNING,
1007 }, {
1008 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1009 .attr = "crit",
1010 .alarm = "crit_alarm",
1011 .sbit = PB_VOLTAGE_OV_FAULT,
1012 },
1013 };
1014
1015 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1016 {
1017 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1018 .attr = "min",
1019 .alarm = "min_alarm",
1020 .sbit = PB_VOLTAGE_UV_WARNING,
1021 }, {
1022 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1023 .attr = "lcrit",
1024 .alarm = "lcrit_alarm",
1025 .sbit = PB_VOLTAGE_UV_FAULT,
1026 }, {
1027 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1028 .attr = "max",
1029 .alarm = "max_alarm",
1030 .sbit = PB_VOLTAGE_OV_WARNING,
1031 }, {
1032 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1033 .attr = "crit",
1034 .alarm = "crit_alarm",
1035 .sbit = PB_VOLTAGE_OV_FAULT,
1036 }
1037 };
1038
1039 static const struct pmbus_sensor_attr voltage_attributes[] = {
1040 {
1041 .reg = PMBUS_READ_VIN,
1042 .class = PSC_VOLTAGE_IN,
1043 .label = "vin",
1044 .func = PMBUS_HAVE_VIN,
1045 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1046 .sbase = PB_STATUS_INPUT_BASE,
1047 .gbit = PB_STATUS_VIN_UV,
1048 .limit = vin_limit_attrs,
1049 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1050 }, {
1051 .reg = PMBUS_READ_VCAP,
1052 .class = PSC_VOLTAGE_IN,
1053 .label = "vcap",
1054 .func = PMBUS_HAVE_VCAP,
1055 }, {
1056 .reg = PMBUS_READ_VOUT,
1057 .class = PSC_VOLTAGE_OUT,
1058 .label = "vout",
1059 .paged = true,
1060 .func = PMBUS_HAVE_VOUT,
1061 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1062 .sbase = PB_STATUS_VOUT_BASE,
1063 .gbit = PB_STATUS_VOUT_OV,
1064 .limit = vout_limit_attrs,
1065 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1066 }
1067 };
1068
1069 /* Current attributes */
1070
1071 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1072 {
1073 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1074 .attr = "max",
1075 .alarm = "max_alarm",
1076 .sbit = PB_IIN_OC_WARNING,
1077 }, {
1078 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1079 .attr = "crit",
1080 .alarm = "crit_alarm",
1081 .sbit = PB_IIN_OC_FAULT,
1082 }
1083 };
1084
1085 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1086 {
1087 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1088 .attr = "max",
1089 .alarm = "max_alarm",
1090 .sbit = PB_IOUT_OC_WARNING,
1091 }, {
1092 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1093 .attr = "lcrit",
1094 .alarm = "lcrit_alarm",
1095 .sbit = PB_IOUT_UC_FAULT,
1096 }, {
1097 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1098 .attr = "crit",
1099 .alarm = "crit_alarm",
1100 .sbit = PB_IOUT_OC_FAULT,
1101 }
1102 };
1103
1104 static const struct pmbus_sensor_attr current_attributes[] = {
1105 {
1106 .reg = PMBUS_READ_IIN,
1107 .class = PSC_CURRENT_IN,
1108 .label = "iin",
1109 .func = PMBUS_HAVE_IIN,
1110 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1111 .sbase = PB_STATUS_INPUT_BASE,
1112 .limit = iin_limit_attrs,
1113 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1114 }, {
1115 .reg = PMBUS_READ_IOUT,
1116 .class = PSC_CURRENT_OUT,
1117 .label = "iout",
1118 .paged = true,
1119 .func = PMBUS_HAVE_IOUT,
1120 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1121 .sbase = PB_STATUS_IOUT_BASE,
1122 .gbit = PB_STATUS_IOUT_OC,
1123 .limit = iout_limit_attrs,
1124 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1125 }
1126 };
1127
1128 /* Power attributes */
1129
1130 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1131 {
1132 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1133 .attr = "max",
1134 .alarm = "alarm",
1135 .sbit = PB_PIN_OP_WARNING,
1136 }
1137 };
1138
1139 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1140 {
1141 .reg = PMBUS_POUT_MAX,
1142 .attr = "cap",
1143 .alarm = "cap_alarm",
1144 .sbit = PB_POWER_LIMITING,
1145 }, {
1146 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1147 .attr = "max",
1148 .alarm = "max_alarm",
1149 .sbit = PB_POUT_OP_WARNING,
1150 }, {
1151 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1152 .attr = "crit",
1153 .alarm = "crit_alarm",
1154 .sbit = PB_POUT_OP_FAULT,
1155 }
1156 };
1157
1158 static const struct pmbus_sensor_attr power_attributes[] = {
1159 {
1160 .reg = PMBUS_READ_PIN,
1161 .class = PSC_POWER,
1162 .label = "pin",
1163 .func = PMBUS_HAVE_PIN,
1164 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1165 .sbase = PB_STATUS_INPUT_BASE,
1166 .limit = pin_limit_attrs,
1167 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1168 }, {
1169 .reg = PMBUS_READ_POUT,
1170 .class = PSC_POWER,
1171 .label = "pout",
1172 .paged = true,
1173 .func = PMBUS_HAVE_POUT,
1174 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1175 .sbase = PB_STATUS_IOUT_BASE,
1176 .limit = pout_limit_attrs,
1177 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1178 }
1179 };
1180
1181 /* Temperature atributes */
1182
1183 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1184 {
1185 .reg = PMBUS_UT_WARN_LIMIT,
1186 .attr = "min",
1187 .alarm = "min_alarm",
1188 .sbit = PB_TEMP_UT_WARNING,
1189 }, {
1190 .reg = PMBUS_UT_FAULT_LIMIT,
1191 .attr = "lcrit",
1192 .alarm = "lcrit_alarm",
1193 .sbit = PB_TEMP_UT_FAULT,
1194 }, {
1195 .reg = PMBUS_OT_WARN_LIMIT,
1196 .attr = "max",
1197 .alarm = "max_alarm",
1198 .sbit = PB_TEMP_OT_WARNING,
1199 }, {
1200 .reg = PMBUS_OT_FAULT_LIMIT,
1201 .attr = "crit",
1202 .alarm = "crit_alarm",
1203 .sbit = PB_TEMP_OT_FAULT,
1204 }
1205 };
1206
1207 static const struct pmbus_sensor_attr temp_attributes[] = {
1208 {
1209 .reg = PMBUS_READ_TEMPERATURE_1,
1210 .class = PSC_TEMPERATURE,
1211 .paged = true,
1212 .update = true,
1213 .compare = true,
1214 .func = PMBUS_HAVE_TEMP,
1215 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1216 .sbase = PB_STATUS_TEMP_BASE,
1217 .gbit = PB_STATUS_TEMPERATURE,
1218 .limit = temp_limit_attrs,
1219 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1220 }, {
1221 .reg = PMBUS_READ_TEMPERATURE_2,
1222 .class = PSC_TEMPERATURE,
1223 .paged = true,
1224 .update = true,
1225 .compare = true,
1226 .func = PMBUS_HAVE_TEMP2,
1227 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1228 .sbase = PB_STATUS_TEMP_BASE,
1229 .gbit = PB_STATUS_TEMPERATURE,
1230 .limit = temp_limit_attrs,
1231 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1232 }, {
1233 .reg = PMBUS_READ_TEMPERATURE_3,
1234 .class = PSC_TEMPERATURE,
1235 .paged = true,
1236 .update = true,
1237 .compare = true,
1238 .func = PMBUS_HAVE_TEMP3,
1239 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1240 .sbase = PB_STATUS_TEMP_BASE,
1241 .gbit = PB_STATUS_TEMPERATURE,
1242 .limit = temp_limit_attrs,
1243 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1244 }
1245 };
1246
1247 static const int pmbus_fan_registers[] = {
1248 PMBUS_READ_FAN_SPEED_1,
1249 PMBUS_READ_FAN_SPEED_2,
1250 PMBUS_READ_FAN_SPEED_3,
1251 PMBUS_READ_FAN_SPEED_4
1252 };
1253
1254 static const int pmbus_fan_config_registers[] = {
1255 PMBUS_FAN_CONFIG_12,
1256 PMBUS_FAN_CONFIG_12,
1257 PMBUS_FAN_CONFIG_34,
1258 PMBUS_FAN_CONFIG_34
1259 };
1260
1261 static const int pmbus_fan_status_registers[] = {
1262 PMBUS_STATUS_FAN_12,
1263 PMBUS_STATUS_FAN_12,
1264 PMBUS_STATUS_FAN_34,
1265 PMBUS_STATUS_FAN_34
1266 };
1267
1268 static const u32 pmbus_fan_flags[] = {
1269 PMBUS_HAVE_FAN12,
1270 PMBUS_HAVE_FAN12,
1271 PMBUS_HAVE_FAN34,
1272 PMBUS_HAVE_FAN34
1273 };
1274
1275 static const u32 pmbus_fan_status_flags[] = {
1276 PMBUS_HAVE_STATUS_FAN12,
1277 PMBUS_HAVE_STATUS_FAN12,
1278 PMBUS_HAVE_STATUS_FAN34,
1279 PMBUS_HAVE_STATUS_FAN34
1280 };
1281
1282 /* Fans */
1283 static void pmbus_add_fan_attributes(struct i2c_client *client,
1284 struct pmbus_data *data)
1285 {
1286 const struct pmbus_driver_info *info = data->info;
1287 int index = 1;
1288 int page;
1289
1290 for (page = 0; page < info->pages; page++) {
1291 int f;
1292
1293 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1294 int regval;
1295
1296 if (!(info->func[page] & pmbus_fan_flags[f]))
1297 break;
1298
1299 if (!pmbus_check_word_register(client, page,
1300 pmbus_fan_registers[f]))
1301 break;
1302
1303 /*
1304 * Skip fan if not installed.
1305 * Each fan configuration register covers multiple fans,
1306 * so we have to do some magic.
1307 */
1308 regval = _pmbus_read_byte_data(client, page,
1309 pmbus_fan_config_registers[f]);
1310 if (regval < 0 ||
1311 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1312 continue;
1313
1314 pmbus_add_sensor(data, "fan", "input", index, page,
1315 pmbus_fan_registers[f], PSC_FAN, true,
1316 true);
1317
1318 /*
1319 * Each fan status register covers multiple fans,
1320 * so we have to do some magic.
1321 */
1322 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1323 pmbus_check_byte_register(client,
1324 page, pmbus_fan_status_registers[f])) {
1325 int base;
1326
1327 if (f > 1) /* fan 3, 4 */
1328 base = PB_STATUS_FAN34_BASE + page;
1329 else
1330 base = PB_STATUS_FAN_BASE + page;
1331 pmbus_add_boolean_reg(data, "fan", "alarm",
1332 index, base,
1333 PB_FAN_FAN1_WARNING >> (f & 1));
1334 pmbus_add_boolean_reg(data, "fan", "fault",
1335 index, base,
1336 PB_FAN_FAN1_FAULT >> (f & 1));
1337 }
1338 index++;
1339 }
1340 }
1341 }
1342
1343 static void pmbus_find_attributes(struct i2c_client *client,
1344 struct pmbus_data *data)
1345 {
1346 /* Voltage sensors */
1347 pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1348 ARRAY_SIZE(voltage_attributes));
1349
1350 /* Current sensors */
1351 pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1352 ARRAY_SIZE(current_attributes));
1353
1354 /* Power sensors */
1355 pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1356 ARRAY_SIZE(power_attributes));
1357
1358 /* Temperature sensors */
1359 pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1360 ARRAY_SIZE(temp_attributes));
1361
1362 /* Fans */
1363 pmbus_add_fan_attributes(client, data);
1364 }
1365
1366 /*
1367 * Identify chip parameters.
1368 * This function is called for all chips.
1369 */
1370 static int pmbus_identify_common(struct i2c_client *client,
1371 struct pmbus_data *data)
1372 {
1373 int vout_mode = -1, exponent;
1374
1375 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1376 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1377 if (vout_mode >= 0 && vout_mode != 0xff) {
1378 /*
1379 * Not all chips support the VOUT_MODE command,
1380 * so a failure to read it is not an error.
1381 */
1382 switch (vout_mode >> 5) {
1383 case 0: /* linear mode */
1384 if (data->info->direct[PSC_VOLTAGE_OUT])
1385 return -ENODEV;
1386
1387 exponent = vout_mode & 0x1f;
1388 /* and sign-extend it */
1389 if (exponent & 0x10)
1390 exponent |= ~0x1f;
1391 data->exponent = exponent;
1392 break;
1393 case 2: /* direct mode */
1394 if (!data->info->direct[PSC_VOLTAGE_OUT])
1395 return -ENODEV;
1396 break;
1397 default:
1398 return -ENODEV;
1399 }
1400 }
1401
1402 /* Determine maximum number of sensors, booleans, and labels */
1403 pmbus_find_max_attr(client, data);
1404 pmbus_clear_fault_page(client, 0);
1405 return 0;
1406 }
1407
1408 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1409 struct pmbus_driver_info *info)
1410 {
1411 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1412 struct pmbus_data *data;
1413 int ret;
1414
1415 if (!info) {
1416 dev_err(&client->dev, "Missing chip information");
1417 return -ENODEV;
1418 }
1419
1420 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1421 | I2C_FUNC_SMBUS_BYTE_DATA
1422 | I2C_FUNC_SMBUS_WORD_DATA))
1423 return -ENODEV;
1424
1425 data = kzalloc(sizeof(*data), GFP_KERNEL);
1426 if (!data) {
1427 dev_err(&client->dev, "No memory to allocate driver data\n");
1428 return -ENOMEM;
1429 }
1430
1431 i2c_set_clientdata(client, data);
1432 mutex_init(&data->update_lock);
1433
1434 /* Bail out if PMBus status register does not exist. */
1435 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0) {
1436 dev_err(&client->dev, "PMBus status register not found\n");
1437 ret = -ENODEV;
1438 goto out_data;
1439 }
1440
1441 if (pdata)
1442 data->flags = pdata->flags;
1443 data->info = info;
1444
1445 pmbus_clear_faults(client);
1446
1447 if (info->identify) {
1448 ret = (*info->identify)(client, info);
1449 if (ret < 0) {
1450 dev_err(&client->dev, "Chip identification failed\n");
1451 goto out_data;
1452 }
1453 }
1454
1455 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1456 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1457 info->pages);
1458 ret = -EINVAL;
1459 goto out_data;
1460 }
1461 /*
1462 * Bail out if more than one page was configured, but we can not
1463 * select the highest page. This is an indication that the wrong
1464 * chip type was selected. Better bail out now than keep
1465 * returning errors later on.
1466 */
1467 if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
1468 dev_err(&client->dev, "Failed to select page %d\n",
1469 info->pages - 1);
1470 ret = -EINVAL;
1471 goto out_data;
1472 }
1473
1474 ret = pmbus_identify_common(client, data);
1475 if (ret < 0) {
1476 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1477 goto out_data;
1478 }
1479
1480 ret = -ENOMEM;
1481 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1482 GFP_KERNEL);
1483 if (!data->sensors) {
1484 dev_err(&client->dev, "No memory to allocate sensor data\n");
1485 goto out_data;
1486 }
1487
1488 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1489 * data->max_booleans, GFP_KERNEL);
1490 if (!data->booleans) {
1491 dev_err(&client->dev, "No memory to allocate boolean data\n");
1492 goto out_sensors;
1493 }
1494
1495 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1496 GFP_KERNEL);
1497 if (!data->labels) {
1498 dev_err(&client->dev, "No memory to allocate label data\n");
1499 goto out_booleans;
1500 }
1501
1502 data->attributes = kzalloc(sizeof(struct attribute *)
1503 * data->max_attributes, GFP_KERNEL);
1504 if (!data->attributes) {
1505 dev_err(&client->dev, "No memory to allocate attribute data\n");
1506 goto out_labels;
1507 }
1508
1509 pmbus_find_attributes(client, data);
1510
1511 /*
1512 * If there are no attributes, something is wrong.
1513 * Bail out instead of trying to register nothing.
1514 */
1515 if (!data->num_attributes) {
1516 dev_err(&client->dev, "No attributes found\n");
1517 ret = -ENODEV;
1518 goto out_attributes;
1519 }
1520
1521 /* Register sysfs hooks */
1522 data->group.attrs = data->attributes;
1523 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1524 if (ret) {
1525 dev_err(&client->dev, "Failed to create sysfs entries\n");
1526 goto out_attributes;
1527 }
1528 data->hwmon_dev = hwmon_device_register(&client->dev);
1529 if (IS_ERR(data->hwmon_dev)) {
1530 ret = PTR_ERR(data->hwmon_dev);
1531 dev_err(&client->dev, "Failed to register hwmon device\n");
1532 goto out_hwmon_device_register;
1533 }
1534 return 0;
1535
1536 out_hwmon_device_register:
1537 sysfs_remove_group(&client->dev.kobj, &data->group);
1538 out_attributes:
1539 kfree(data->attributes);
1540 out_labels:
1541 kfree(data->labels);
1542 out_booleans:
1543 kfree(data->booleans);
1544 out_sensors:
1545 kfree(data->sensors);
1546 out_data:
1547 kfree(data);
1548 return ret;
1549 }
1550 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1551
1552 int pmbus_do_remove(struct i2c_client *client)
1553 {
1554 struct pmbus_data *data = i2c_get_clientdata(client);
1555 hwmon_device_unregister(data->hwmon_dev);
1556 sysfs_remove_group(&client->dev.kobj, &data->group);
1557 kfree(data->attributes);
1558 kfree(data->labels);
1559 kfree(data->booleans);
1560 kfree(data->sensors);
1561 kfree(data);
1562 return 0;
1563 }
1564 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1565
1566 MODULE_AUTHOR("Guenter Roeck");
1567 MODULE_DESCRIPTION("PMBus core driver");
1568 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree