projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
hwmon: use module_pci_driver
[deliverable/linux.git] / drivers / hwmon / acpi_power_meter.c
CommitLineData
de584afa
DW		 1/*
2 * A hwmon driver for ACPI 4.0 power meters
3 * Copyright (C) 2009 IBM
4 *
5 * Author: Darrick J. Wong <djwong@us.ibm.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/module.h>
23#include <linux/hwmon.h>
24#include <linux/hwmon-sysfs.h>
25#include <linux/jiffies.h>
26#include <linux/mutex.h>
27#include <linux/dmi.h>
5a0e3ad6 28#include <linux/slab.h>
de584afa
DW		 29#include <linux/kdev_t.h>
30#include <linux/sched.h>
31#include <linux/time.h>
32#include <acpi/acpi_drivers.h>
33#include <acpi/acpi_bus.h>
34
35#define ACPI_POWER_METER_NAME "power_meter"
36ACPI_MODULE_NAME(ACPI_POWER_METER_NAME);
37#define ACPI_POWER_METER_DEVICE_NAME "Power Meter"
18262714 38#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
de584afa
DW		 39
40#define NUM_SENSORS 17
41
42#define POWER_METER_CAN_MEASURE (1 << 0)
43#define POWER_METER_CAN_TRIP (1 << 1)
44#define POWER_METER_CAN_CAP (1 << 2)
45#define POWER_METER_CAN_NOTIFY (1 << 3)
46#define POWER_METER_IS_BATTERY (1 << 8)
47#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
48
49#define METER_NOTIFY_CONFIG 0x80
50#define METER_NOTIFY_TRIP 0x81
51#define METER_NOTIFY_CAP 0x82
52#define METER_NOTIFY_CAPPING 0x83
53#define METER_NOTIFY_INTERVAL 0x84
54
55#define POWER_AVERAGE_NAME "power1_average"
56#define POWER_CAP_NAME "power1_cap"
57#define POWER_AVG_INTERVAL_NAME "power1_average_interval"
58#define POWER_ALARM_NAME "power1_alarm"
59
60static int cap_in_hardware;
90ab5ee9 61static bool force_cap_on;
de584afa
DW		 62
63static int can_cap_in_hardware(void)
64{
65 return force_cap_on || cap_in_hardware;
66}
67
c97adf9e 68static const struct acpi_device_id power_meter_ids[] = {
de584afa
DW		 69 {"ACPI000D", 0},
70 {"", 0},
71};
72MODULE_DEVICE_TABLE(acpi, power_meter_ids);
73
74struct acpi_power_meter_capabilities {
439913ff
LM		 75 u64 flags;
76 u64 units;
77 u64 type;
78 u64 accuracy;
79 u64 sampling_time;
80 u64 min_avg_interval;
81 u64 max_avg_interval;
82 u64 hysteresis;
83 u64 configurable_cap;
84 u64 min_cap;
85 u64 max_cap;
de584afa
DW		 86};
87
88struct acpi_power_meter_resource {
89 struct acpi_device *acpi_dev;
90 acpi_bus_id name;
91 struct mutex lock;
92 struct device *hwmon_dev;
93 struct acpi_power_meter_capabilities caps;
94 acpi_string model_number;
95 acpi_string serial_number;
96 acpi_string oem_info;
439913ff
LM		 97 u64 power;
98 u64 cap;
99 u64 avg_interval;
de584afa
DW		 100 int sensors_valid;
101 unsigned long sensors_last_updated;
102 struct sensor_device_attribute sensors[NUM_SENSORS];
103 int num_sensors;
104 int trip[2];
105 int num_domain_devices;
106 struct acpi_device **domain_devices;
107 struct kobject *holders_dir;
108};
109
110struct ro_sensor_template {
111 char *label;
112 ssize_t (*show)(struct device *dev,
113 struct device_attribute *devattr,
114 char *buf);
115 int index;
116};
117
118struct rw_sensor_template {
119 char *label;
120 ssize_t (*show)(struct device *dev,
121 struct device_attribute *devattr,
122 char *buf);
123 ssize_t (*set)(struct device *dev,
124 struct device_attribute *devattr,
125 const char *buf, size_t count);
126 int index;
127};
128
129/* Averaging interval */
130static int update_avg_interval(struct acpi_power_meter_resource *resource)
131{
132 unsigned long long data;
133 acpi_status status;
134
135 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
136 NULL, &data);
137 if (ACPI_FAILURE(status)) {
138 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
139 return -ENODEV;
140 }
141
142 resource->avg_interval = data;
143 return 0;
144}
145
146static ssize_t show_avg_interval(struct device *dev,
147 struct device_attribute *devattr,
148 char *buf)
149{
150 struct acpi_device *acpi_dev = to_acpi_device(dev);
151 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
152
153 mutex_lock(&resource->lock);
154 update_avg_interval(resource);
155 mutex_unlock(&resource->lock);
156
157 return sprintf(buf, "%llu\n", resource->avg_interval);
158}
159
160static ssize_t set_avg_interval(struct device *dev,
161 struct device_attribute *devattr,
162 const char *buf, size_t count)
163{
164 struct acpi_device *acpi_dev = to_acpi_device(dev);
165 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
166 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
167 struct acpi_object_list args = { 1, &arg0 };
168 int res;
169 unsigned long temp;
170 unsigned long long data;
171 acpi_status status;
172
179c4fdb 173 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 174 if (res)
175 return res;
176
177 if (temp > resource->caps.max_avg_interval ||
178 temp < resource->caps.min_avg_interval)
179 return -EINVAL;
180 arg0.integer.value = temp;
181
182 mutex_lock(&resource->lock);
183 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
184 &args, &data);
185 if (!ACPI_FAILURE(status))
186 resource->avg_interval = temp;
187 mutex_unlock(&resource->lock);
188
189 if (ACPI_FAILURE(status)) {
190 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
191 return -EINVAL;
192 }
193
194 /* _PAI returns 0 on success, nonzero otherwise */
195 if (data)
196 return -EINVAL;
197
198 return count;
199}
200
201/* Cap functions */
202static int update_cap(struct acpi_power_meter_resource *resource)
203{
204 unsigned long long data;
205 acpi_status status;
206
207 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
208 NULL, &data);
209 if (ACPI_FAILURE(status)) {
210 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
211 return -ENODEV;
212 }
213
214 resource->cap = data;
215 return 0;
216}
217
218static ssize_t show_cap(struct device *dev,
219 struct device_attribute *devattr,
220 char *buf)
221{
222 struct acpi_device *acpi_dev = to_acpi_device(dev);
223 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
224
225 mutex_lock(&resource->lock);
226 update_cap(resource);
227 mutex_unlock(&resource->lock);
228
229 return sprintf(buf, "%llu\n", resource->cap * 1000);
230}
231
232static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
233 const char *buf, size_t count)
234{
235 struct acpi_device *acpi_dev = to_acpi_device(dev);
236 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
237 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
238 struct acpi_object_list args = { 1, &arg0 };
239 int res;
240 unsigned long temp;
241 unsigned long long data;
242 acpi_status status;
243
179c4fdb 244 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 245 if (res)
246 return res;
247
248 temp /= 1000;
249 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
250 return -EINVAL;
251 arg0.integer.value = temp;
252
253 mutex_lock(&resource->lock);
254 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
255 &args, &data);
256 if (!ACPI_FAILURE(status))
257 resource->cap = temp;
258 mutex_unlock(&resource->lock);
259
260 if (ACPI_FAILURE(status)) {
261 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
262 return -EINVAL;
263 }
264
265 /* _SHL returns 0 on success, nonzero otherwise */
266 if (data)
267 return -EINVAL;
268
269 return count;
270}
271
272/* Power meter trip points */
273static int set_acpi_trip(struct acpi_power_meter_resource *resource)
274{
275 union acpi_object arg_objs[] = {
276 {ACPI_TYPE_INTEGER},
277 {ACPI_TYPE_INTEGER}
278 };
279 struct acpi_object_list args = { 2, arg_objs };
280 unsigned long long data;
281 acpi_status status;
282
283 /* Both trip levels must be set */
284 if (resource->trip[0] < 0 || resource->trip[1] < 0)
285 return 0;
286
287 /* This driver stores min, max; ACPI wants max, min. */
288 arg_objs[0].integer.value = resource->trip[1];
289 arg_objs[1].integer.value = resource->trip[0];
290
291 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
292 &args, &data);
293 if (ACPI_FAILURE(status)) {
294 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
295 return -EINVAL;
296 }
297
22aecebf
DW		 298 /* _PTP returns 0 on success, nonzero otherwise */
299 if (data)
300 return -EINVAL;
301
302 return 0;
de584afa
DW		 303}
304
305static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
306 const char *buf, size_t count)
307{
308 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
309 struct acpi_device *acpi_dev = to_acpi_device(dev);
310 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
311 int res;
312 unsigned long temp;
313
179c4fdb 314 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 315 if (res)
316 return res;
317
318 temp /= 1000;
319 if (temp < 0)
320 return -EINVAL;
321
322 mutex_lock(&resource->lock);
323 resource->trip[attr->index - 7] = temp;
324 res = set_acpi_trip(resource);
325 mutex_unlock(&resource->lock);
326
327 if (res)
328 return res;
329
330 return count;
331}
332
333/* Power meter */
334static int update_meter(struct acpi_power_meter_resource *resource)
335{
336 unsigned long long data;
337 acpi_status status;
338 unsigned long local_jiffies = jiffies;
339
340 if (time_before(local_jiffies, resource->sensors_last_updated +
341 msecs_to_jiffies(resource->caps.sampling_time)) &&
342 resource->sensors_valid)
343 return 0;
344
345 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
346 NULL, &data);
347 if (ACPI_FAILURE(status)) {
348 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
349 return -ENODEV;
350 }
351
352 resource->power = data;
353 resource->sensors_valid = 1;
354 resource->sensors_last_updated = jiffies;
355 return 0;
356}
357
358static ssize_t show_power(struct device *dev,
359 struct device_attribute *devattr,
360 char *buf)
361{
362 struct acpi_device *acpi_dev = to_acpi_device(dev);
363 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
364
365 mutex_lock(&resource->lock);
366 update_meter(resource);
367 mutex_unlock(&resource->lock);
368
369 return sprintf(buf, "%llu\n", resource->power * 1000);
370}
371
372/* Miscellaneous */
373static ssize_t show_str(struct device *dev,
374 struct device_attribute *devattr,
375 char *buf)
376{
377 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
378 struct acpi_device *acpi_dev = to_acpi_device(dev);
379 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
380 acpi_string val;
381
382 switch (attr->index) {
383 case 0:
384 val = resource->model_number;
385 break;
386 case 1:
387 val = resource->serial_number;
388 break;
389 case 2:
390 val = resource->oem_info;
391 break;
392 default:
393 BUG();
776cdc11 394 val = "";
de584afa
DW		 395 }
396
397 return sprintf(buf, "%s\n", val);
398}
399
400static ssize_t show_val(struct device *dev,
401 struct device_attribute *devattr,
402 char *buf)
403{
404 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
405 struct acpi_device *acpi_dev = to_acpi_device(dev);
406 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
439913ff 407 u64 val = 0;
de584afa
DW		 408
409 switch (attr->index) {
410 case 0:
411 val = resource->caps.min_avg_interval;
412 break;
413 case 1:
414 val = resource->caps.max_avg_interval;
415 break;
416 case 2:
417 val = resource->caps.min_cap * 1000;
418 break;
419 case 3:
420 val = resource->caps.max_cap * 1000;
421 break;
422 case 4:
423 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
424 return sprintf(buf, "unknown\n");
425
426 val = resource->caps.hysteresis * 1000;
427 break;
428 case 5:
429 if (resource->caps.flags & POWER_METER_IS_BATTERY)
430 val = 1;
431 else
432 val = 0;
433 break;
434 case 6:
435 if (resource->power > resource->cap)
436 val = 1;
437 else
438 val = 0;
439 break;
440 case 7:
441 case 8:
442 if (resource->trip[attr->index - 7] < 0)
443 return sprintf(buf, "unknown\n");
444
445 val = resource->trip[attr->index - 7] * 1000;
446 break;
447 default:
448 BUG();
449 }
450
451 return sprintf(buf, "%llu\n", val);
452}
453
454static ssize_t show_accuracy(struct device *dev,
455 struct device_attribute *devattr,
456 char *buf)
457{
458 struct acpi_device *acpi_dev = to_acpi_device(dev);
459 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
460 unsigned int acc = resource->caps.accuracy;
461
462 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
463}
464
465static ssize_t show_name(struct device *dev,
466 struct device_attribute *devattr,
467 char *buf)
468{
469 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
470}
471
472/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
473static struct ro_sensor_template meter_ro_attrs[] = {
474{POWER_AVERAGE_NAME, show_power, 0},
475{"power1_accuracy", show_accuracy, 0},
476{"power1_average_interval_min", show_val, 0},
477{"power1_average_interval_max", show_val, 1},
478{"power1_is_battery", show_val, 5},
479{NULL, NULL, 0},
480};
481
482static struct rw_sensor_template meter_rw_attrs[] = {
483{POWER_AVG_INTERVAL_NAME, show_avg_interval, set_avg_interval, 0},
484{NULL, NULL, NULL, 0},
485};
486
487static struct ro_sensor_template misc_cap_attrs[] = {
488{"power1_cap_min", show_val, 2},
489{"power1_cap_max", show_val, 3},
490{"power1_cap_hyst", show_val, 4},
491{POWER_ALARM_NAME, show_val, 6},
492{NULL, NULL, 0},
493};
494
495static struct ro_sensor_template ro_cap_attrs[] = {
496{POWER_CAP_NAME, show_cap, 0},
497{NULL, NULL, 0},
498};
499
500static struct rw_sensor_template rw_cap_attrs[] = {
501{POWER_CAP_NAME, show_cap, set_cap, 0},
502{NULL, NULL, NULL, 0},
503};
504
505static struct rw_sensor_template trip_attrs[] = {
506{"power1_average_min", show_val, set_trip, 7},
507{"power1_average_max", show_val, set_trip, 8},
508{NULL, NULL, NULL, 0},
509};
510
511static struct ro_sensor_template misc_attrs[] = {
512{"name", show_name, 0},
513{"power1_model_number", show_str, 0},
514{"power1_oem_info", show_str, 2},
515{"power1_serial_number", show_str, 1},
516{NULL, NULL, 0},
517};
518
519/* Read power domain data */
520static void remove_domain_devices(struct acpi_power_meter_resource *resource)
521{
522 int i;
523
524 if (!resource->num_domain_devices)
525 return;
526
527 for (i = 0; i < resource->num_domain_devices; i++) {
528 struct acpi_device *obj = resource->domain_devices[i];
529 if (!obj)
530 continue;
531
532 sysfs_remove_link(resource->holders_dir,
533 kobject_name(&obj->dev.kobj));
534 put_device(&obj->dev);
535 }
536
537 kfree(resource->domain_devices);
538 kobject_put(resource->holders_dir);
7f07a605 539 resource->num_domain_devices = 0;
de584afa
DW		 540}
541
542static int read_domain_devices(struct acpi_power_meter_resource *resource)
543{
544 int res = 0;
545 int i;
546 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
547 union acpi_object *pss;
548 acpi_status status;
549
550 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
551 &buffer);
552 if (ACPI_FAILURE(status)) {
553 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
554 return -ENODEV;
555 }
556
557 pss = buffer.pointer;
558 if (!pss ||
559 pss->type != ACPI_TYPE_PACKAGE) {
560 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
561 "Invalid _PMD data\n");
562 res = -EFAULT;
563 goto end;
564 }
565
566 if (!pss->package.count)
567 goto end;
568
569 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
570 pss->package.count, GFP_KERNEL);
571 if (!resource->domain_devices) {
572 res = -ENOMEM;
573 goto end;
574 }
575
576 resource->holders_dir = kobject_create_and_add("measures",
577 &resource->acpi_dev->dev.kobj);
578 if (!resource->holders_dir) {
579 res = -ENOMEM;
580 goto exit_free;
581 }
582
583 resource->num_domain_devices = pss->package.count;
584
585 for (i = 0; i < pss->package.count; i++) {
586 struct acpi_device *obj;
587 union acpi_object *element = &(pss->package.elements[i]);
588
589 /* Refuse non-references */
590 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
591 continue;
592
593 /* Create a symlink to domain objects */
594 resource->domain_devices[i] = NULL;
595 status = acpi_bus_get_device(element->reference.handle,
596 &resource->domain_devices[i]);
597 if (ACPI_FAILURE(status))
598 continue;
599
600 obj = resource->domain_devices[i];
601 get_device(&obj->dev);
602
603 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
604 kobject_name(&obj->dev.kobj));
605 if (res) {
606 put_device(&obj->dev);
607 resource->domain_devices[i] = NULL;
608 }
609 }
610
611 res = 0;
612 goto end;
613
614exit_free:
615 kfree(resource->domain_devices);
616end:
617 kfree(buffer.pointer);
618 return res;
619}
620
621/* Registration and deregistration */
622static int register_ro_attrs(struct acpi_power_meter_resource *resource,
623 struct ro_sensor_template *ro)
624{
625 struct device *dev = &resource->acpi_dev->dev;
626 struct sensor_device_attribute *sensors =
627 &resource->sensors[resource->num_sensors];
628 int res = 0;
629
630 while (ro->label) {
631 sensors->dev_attr.attr.name = ro->label;
632 sensors->dev_attr.attr.mode = S_IRUGO;
633 sensors->dev_attr.show = ro->show;
634 sensors->index = ro->index;
635
31e354ee 636 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 637 res = device_create_file(dev, &sensors->dev_attr);
638 if (res) {
639 sensors->dev_attr.attr.name = NULL;
640 goto error;
641 }
642 sensors++;
643 resource->num_sensors++;
644 ro++;
645 }
646
647error:
648 return res;
649}
650
651static int register_rw_attrs(struct acpi_power_meter_resource *resource,
652 struct rw_sensor_template *rw)
653{
654 struct device *dev = &resource->acpi_dev->dev;
655 struct sensor_device_attribute *sensors =
656 &resource->sensors[resource->num_sensors];
657 int res = 0;
658
659 while (rw->label) {
660 sensors->dev_attr.attr.name = rw->label;
661 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR;
662 sensors->dev_attr.show = rw->show;
663 sensors->dev_attr.store = rw->set;
664 sensors->index = rw->index;
665
31e354ee 666 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 667 res = device_create_file(dev, &sensors->dev_attr);
668 if (res) {
669 sensors->dev_attr.attr.name = NULL;
670 goto error;
671 }
672 sensors++;
673 resource->num_sensors++;
674 rw++;
675 }
676
677error:
678 return res;
679}
680
681static void remove_attrs(struct acpi_power_meter_resource *resource)
682{
683 int i;
684
685 for (i = 0; i < resource->num_sensors; i++) {
686 if (!resource->sensors[i].dev_attr.attr.name)
687 continue;
688 device_remove_file(&resource->acpi_dev->dev,
689 &resource->sensors[i].dev_attr);
690 }
691
692 remove_domain_devices(resource);
693
694 resource->num_sensors = 0;
695}
696
697static int setup_attrs(struct acpi_power_meter_resource *resource)
698{
699 int res = 0;
700
701 res = read_domain_devices(resource);
702 if (res)
703 return res;
704
705 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
706 res = register_ro_attrs(resource, meter_ro_attrs);
707 if (res)
708 goto error;
709 res = register_rw_attrs(resource, meter_rw_attrs);
710 if (res)
711 goto error;
712 }
713
714 if (resource->caps.flags & POWER_METER_CAN_CAP) {
715 if (!can_cap_in_hardware()) {
716 dev_err(&resource->acpi_dev->dev,
717 "Ignoring unsafe software power cap!\n");
718 goto skip_unsafe_cap;
719 }
720
721 if (resource->caps.configurable_cap) {
722 res = register_rw_attrs(resource, rw_cap_attrs);
723 if (res)
724 goto error;
725 } else {
726 res = register_ro_attrs(resource, ro_cap_attrs);
727 if (res)
728 goto error;
729 }
730 res = register_ro_attrs(resource, misc_cap_attrs);
731 if (res)
732 goto error;
733 }
734skip_unsafe_cap:
735
736 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
737 res = register_rw_attrs(resource, trip_attrs);
738 if (res)
739 goto error;
740 }
741
742 res = register_ro_attrs(resource, misc_attrs);
743 if (res)
744 goto error;
745
746 return res;
747error:
de584afa
DW		 748 remove_attrs(resource);
749 return res;
750}
751
752static void free_capabilities(struct acpi_power_meter_resource *resource)
753{
754 acpi_string *str;
755 int i;
756
757 str = &resource->model_number;
758 for (i = 0; i < 3; i++, str++)
759 kfree(*str);
760}
761
762static int read_capabilities(struct acpi_power_meter_resource *resource)
763{
764 int res = 0;
765 int i;
766 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
767 struct acpi_buffer state = { 0, NULL };
768 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
769 union acpi_object *pss;
770 acpi_string *str;
771 acpi_status status;
772
773 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
774 &buffer);
775 if (ACPI_FAILURE(status)) {
776 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
777 return -ENODEV;
778 }
779
780 pss = buffer.pointer;
781 if (!pss ||
782 pss->type != ACPI_TYPE_PACKAGE ||
783 pss->package.count != 14) {
784 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
785 "Invalid _PMC data\n");
786 res = -EFAULT;
787 goto end;
788 }
789
790 /* Grab all the integer data at once */
791 state.length = sizeof(struct acpi_power_meter_capabilities);
792 state.pointer = &resource->caps;
793
794 status = acpi_extract_package(pss, &format, &state);
795 if (ACPI_FAILURE(status)) {
796 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
797 res = -EFAULT;
798 goto end;
799 }
800
801 if (resource->caps.units) {
802 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
803 "Unknown units %llu.\n",
804 resource->caps.units);
805 res = -EINVAL;
806 goto end;
807 }
808
809 /* Grab the string data */
810 str = &resource->model_number;
811
812 for (i = 11; i < 14; i++) {
813 union acpi_object *element = &(pss->package.elements[i]);
814
815 if (element->type != ACPI_TYPE_STRING) {
816 res = -EINVAL;
817 goto error;
818 }
819
820 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
821 GFP_KERNEL);
822 if (!*str) {
823 res = -ENOMEM;
824 goto error;
825 }
826
827 strncpy(*str, element->string.pointer, element->string.length);
828 str++;
829 }
830
831 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
832 goto end;
833error:
834 str = &resource->model_number;
835 for (i = 0; i < 3; i++, str++)
836 kfree(*str);
837end:
838 kfree(buffer.pointer);
839 return res;
840}
841
842/* Handle ACPI event notifications */
843static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
844{
845 struct acpi_power_meter_resource *resource;
846 int res;
847
848 if (!device || !acpi_driver_data(device))
849 return;
850
851 resource = acpi_driver_data(device);
852
853 mutex_lock(&resource->lock);
854 switch (event) {
855 case METER_NOTIFY_CONFIG:
856 free_capabilities(resource);
857 res = read_capabilities(resource);
858 if (res)
859 break;
860
861 remove_attrs(resource);
862 setup_attrs(resource);
863 break;
864 case METER_NOTIFY_TRIP:
865 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
866 update_meter(resource);
867 break;
868 case METER_NOTIFY_CAP:
869 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
870 update_cap(resource);
871 break;
872 case METER_NOTIFY_INTERVAL:
873 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
874 update_avg_interval(resource);
875 break;
876 case METER_NOTIFY_CAPPING:
877 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
878 dev_info(&device->dev, "Capping in progress.\n");
879 break;
880 default:
881 BUG();
882 }
883 mutex_unlock(&resource->lock);
884
885 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
886 dev_name(&device->dev), event, 0);
887}
888
889static int acpi_power_meter_add(struct acpi_device *device)
890{
891 int res;
892 struct acpi_power_meter_resource *resource;
893
894 if (!device)
895 return -EINVAL;
896
897 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
898 GFP_KERNEL);
899 if (!resource)
900 return -ENOMEM;
901
902 resource->sensors_valid = 0;
903 resource->acpi_dev = device;
904 mutex_init(&resource->lock);
905 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
906 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
907 device->driver_data = resource;
908
909 free_capabilities(resource);
910 res = read_capabilities(resource);
911 if (res)
912 goto exit_free;
913
914 resource->trip[0] = resource->trip[1] = -1;
915
916 res = setup_attrs(resource);
917 if (res)
918 goto exit_free;
919
920 resource->hwmon_dev = hwmon_device_register(&device->dev);
921 if (IS_ERR(resource->hwmon_dev)) {
922 res = PTR_ERR(resource->hwmon_dev);
923 goto exit_remove;
924 }
925
926 res = 0;
927 goto exit;
928
929exit_remove:
930 remove_attrs(resource);
931exit_free:
932 kfree(resource);
933exit:
934 return res;
935}
936
937static int acpi_power_meter_remove(struct acpi_device *device, int type)
938{
939 struct acpi_power_meter_resource *resource;
940
941 if (!device || !acpi_driver_data(device))
942 return -EINVAL;
943
944 resource = acpi_driver_data(device);
945 hwmon_device_unregister(resource->hwmon_dev);
946
947 free_capabilities(resource);
948 remove_attrs(resource);
949
950 kfree(resource);
951 return 0;
952}
953
954static int acpi_power_meter_resume(struct acpi_device *device)
955{
956 struct acpi_power_meter_resource *resource;
957
958 if (!device || !acpi_driver_data(device))
959 return -EINVAL;
960
961 resource = acpi_driver_data(device);
962 free_capabilities(resource);
963 read_capabilities(resource);
964
965 return 0;
966}
967
968static struct acpi_driver acpi_power_meter_driver = {
969 .name = "power_meter",
970 .class = ACPI_POWER_METER_CLASS,
971 .ids = power_meter_ids,
972 .ops = {
973 .add = acpi_power_meter_add,
974 .remove = acpi_power_meter_remove,
975 .resume = acpi_power_meter_resume,
976 .notify = acpi_power_meter_notify,
977 },
978};
979
980/* Module init/exit routines */
981static int __init enable_cap_knobs(const struct dmi_system_id *d)
982{
983 cap_in_hardware = 1;
984 return 0;
985}
986
987static struct dmi_system_id __initdata pm_dmi_table[] = {
988 {
989 enable_cap_knobs, "IBM Active Energy Manager",
990 {
991 DMI_MATCH(DMI_SYS_VENDOR, "IBM")
992 },
993 },
994 {}
995};
996
997static int __init acpi_power_meter_init(void)
998{
999 int result;
1000
1001 if (acpi_disabled)
1002 return -ENODEV;
1003
1004 dmi_check_system(pm_dmi_table);
1005
1006 result = acpi_bus_register_driver(&acpi_power_meter_driver);
1007 if (result < 0)
1008 return -ENODEV;
1009
1010 return 0;
1011}
1012
1013static void __exit acpi_power_meter_exit(void)
1014{
1015 acpi_bus_unregister_driver(&acpi_power_meter_driver);
1016}
1017
1018MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1019MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
1020MODULE_LICENSE("GPL");
1021
1022module_param(force_cap_on, bool, 0644);
1023MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1024
1025module_init(acpi_power_meter_init);
1026module_exit(acpi_power_meter_exit);
Linux kernel - Deliverables
This page took 0.230481 seconds and 5 git commands to generate.