]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - drivers/hwmon/acpi_power_meter.c
projects / mirror_ubuntu-bionic-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
hwmon: Add missing inclusions of <linux/jiffies.h>
[mirror_ubuntu-bionic-kernel.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;
75311bea 104 s64 trip[2];
de584afa
DW		 105 int num_domain_devices;
106 struct acpi_device **domain_devices;
107 struct kobject *holders_dir;
108};
109
81194cd2 110struct sensor_template {
de584afa
DW		 111 char *label;
112 ssize_t (*show)(struct device *dev,
113 struct device_attribute *devattr,
114 char *buf);
115 ssize_t (*set)(struct device *dev,
116 struct device_attribute *devattr,
117 const char *buf, size_t count);
118 int index;
119};
120
121/* Averaging interval */
122static int update_avg_interval(struct acpi_power_meter_resource *resource)
123{
124 unsigned long long data;
125 acpi_status status;
126
127 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
128 NULL, &data);
129 if (ACPI_FAILURE(status)) {
130 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
131 return -ENODEV;
132 }
133
134 resource->avg_interval = data;
135 return 0;
136}
137
138static ssize_t show_avg_interval(struct device *dev,
139 struct device_attribute *devattr,
140 char *buf)
141{
142 struct acpi_device *acpi_dev = to_acpi_device(dev);
143 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
144
145 mutex_lock(&resource->lock);
146 update_avg_interval(resource);
147 mutex_unlock(&resource->lock);
148
149 return sprintf(buf, "%llu\n", resource->avg_interval);
150}
151
152static ssize_t set_avg_interval(struct device *dev,
153 struct device_attribute *devattr,
154 const char *buf, size_t count)
155{
156 struct acpi_device *acpi_dev = to_acpi_device(dev);
157 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
158 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
159 struct acpi_object_list args = { 1, &arg0 };
160 int res;
161 unsigned long temp;
162 unsigned long long data;
163 acpi_status status;
164
179c4fdb 165 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 166 if (res)
167 return res;
168
169 if (temp > resource->caps.max_avg_interval ||
170 temp < resource->caps.min_avg_interval)
171 return -EINVAL;
172 arg0.integer.value = temp;
173
174 mutex_lock(&resource->lock);
175 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
176 &args, &data);
177 if (!ACPI_FAILURE(status))
178 resource->avg_interval = temp;
179 mutex_unlock(&resource->lock);
180
181 if (ACPI_FAILURE(status)) {
182 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
183 return -EINVAL;
184 }
185
186 /* _PAI returns 0 on success, nonzero otherwise */
187 if (data)
188 return -EINVAL;
189
190 return count;
191}
192
193/* Cap functions */
194static int update_cap(struct acpi_power_meter_resource *resource)
195{
196 unsigned long long data;
197 acpi_status status;
198
199 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
200 NULL, &data);
201 if (ACPI_FAILURE(status)) {
202 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
203 return -ENODEV;
204 }
205
206 resource->cap = data;
207 return 0;
208}
209
210static ssize_t show_cap(struct device *dev,
211 struct device_attribute *devattr,
212 char *buf)
213{
214 struct acpi_device *acpi_dev = to_acpi_device(dev);
215 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
216
217 mutex_lock(&resource->lock);
218 update_cap(resource);
219 mutex_unlock(&resource->lock);
220
221 return sprintf(buf, "%llu\n", resource->cap * 1000);
222}
223
224static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
225 const char *buf, size_t count)
226{
227 struct acpi_device *acpi_dev = to_acpi_device(dev);
228 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
229 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
230 struct acpi_object_list args = { 1, &arg0 };
231 int res;
232 unsigned long temp;
233 unsigned long long data;
234 acpi_status status;
235
179c4fdb 236 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 237 if (res)
238 return res;
239
27c4db39 240 temp = DIV_ROUND_CLOSEST(temp, 1000);
de584afa
DW		 241 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
242 return -EINVAL;
243 arg0.integer.value = temp;
244
245 mutex_lock(&resource->lock);
246 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
247 &args, &data);
248 if (!ACPI_FAILURE(status))
249 resource->cap = temp;
250 mutex_unlock(&resource->lock);
251
252 if (ACPI_FAILURE(status)) {
253 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
254 return -EINVAL;
255 }
256
257 /* _SHL returns 0 on success, nonzero otherwise */
258 if (data)
259 return -EINVAL;
260
261 return count;
262}
263
264/* Power meter trip points */
265static int set_acpi_trip(struct acpi_power_meter_resource *resource)
266{
267 union acpi_object arg_objs[] = {
268 {ACPI_TYPE_INTEGER},
269 {ACPI_TYPE_INTEGER}
270 };
271 struct acpi_object_list args = { 2, arg_objs };
272 unsigned long long data;
273 acpi_status status;
274
275 /* Both trip levels must be set */
276 if (resource->trip[0] < 0 || resource->trip[1] < 0)
277 return 0;
278
279 /* This driver stores min, max; ACPI wants max, min. */
280 arg_objs[0].integer.value = resource->trip[1];
281 arg_objs[1].integer.value = resource->trip[0];
282
283 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
284 &args, &data);
285 if (ACPI_FAILURE(status)) {
286 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
287 return -EINVAL;
288 }
289
22aecebf
DW		 290 /* _PTP returns 0 on success, nonzero otherwise */
291 if (data)
292 return -EINVAL;
293
294 return 0;
de584afa
DW		 295}
296
297static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
298 const char *buf, size_t count)
299{
300 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
301 struct acpi_device *acpi_dev = to_acpi_device(dev);
302 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
303 int res;
304 unsigned long temp;
305
179c4fdb 306 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 307 if (res)
308 return res;
309
27c4db39 310 temp = DIV_ROUND_CLOSEST(temp, 1000);
de584afa
DW		 311
312 mutex_lock(&resource->lock);
313 resource->trip[attr->index - 7] = temp;
314 res = set_acpi_trip(resource);
315 mutex_unlock(&resource->lock);
316
317 if (res)
318 return res;
319
320 return count;
321}
322
323/* Power meter */
324static int update_meter(struct acpi_power_meter_resource *resource)
325{
326 unsigned long long data;
327 acpi_status status;
328 unsigned long local_jiffies = jiffies;
329
330 if (time_before(local_jiffies, resource->sensors_last_updated +
331 msecs_to_jiffies(resource->caps.sampling_time)) &&
332 resource->sensors_valid)
333 return 0;
334
335 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
336 NULL, &data);
337 if (ACPI_FAILURE(status)) {
338 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
339 return -ENODEV;
340 }
341
342 resource->power = data;
343 resource->sensors_valid = 1;
344 resource->sensors_last_updated = jiffies;
345 return 0;
346}
347
348static ssize_t show_power(struct device *dev,
349 struct device_attribute *devattr,
350 char *buf)
351{
352 struct acpi_device *acpi_dev = to_acpi_device(dev);
353 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
354
355 mutex_lock(&resource->lock);
356 update_meter(resource);
357 mutex_unlock(&resource->lock);
358
359 return sprintf(buf, "%llu\n", resource->power * 1000);
360}
361
362/* Miscellaneous */
363static ssize_t show_str(struct device *dev,
364 struct device_attribute *devattr,
365 char *buf)
366{
367 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
368 struct acpi_device *acpi_dev = to_acpi_device(dev);
369 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
370 acpi_string val;
371
372 switch (attr->index) {
373 case 0:
374 val = resource->model_number;
375 break;
376 case 1:
377 val = resource->serial_number;
378 break;
379 case 2:
380 val = resource->oem_info;
381 break;
382 default:
383 BUG();
776cdc11 384 val = "";
de584afa
DW		 385 }
386
387 return sprintf(buf, "%s\n", val);
388}
389
390static ssize_t show_val(struct device *dev,
391 struct device_attribute *devattr,
392 char *buf)
393{
394 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
395 struct acpi_device *acpi_dev = to_acpi_device(dev);
396 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
439913ff 397 u64 val = 0;
de584afa
DW		 398
399 switch (attr->index) {
400 case 0:
401 val = resource->caps.min_avg_interval;
402 break;
403 case 1:
404 val = resource->caps.max_avg_interval;
405 break;
406 case 2:
407 val = resource->caps.min_cap * 1000;
408 break;
409 case 3:
410 val = resource->caps.max_cap * 1000;
411 break;
412 case 4:
413 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
414 return sprintf(buf, "unknown\n");
415
416 val = resource->caps.hysteresis * 1000;
417 break;
418 case 5:
419 if (resource->caps.flags & POWER_METER_IS_BATTERY)
420 val = 1;
421 else
422 val = 0;
423 break;
424 case 6:
425 if (resource->power > resource->cap)
426 val = 1;
427 else
428 val = 0;
429 break;
430 case 7:
431 case 8:
432 if (resource->trip[attr->index - 7] < 0)
433 return sprintf(buf, "unknown\n");
434
435 val = resource->trip[attr->index - 7] * 1000;
436 break;
437 default:
438 BUG();
439 }
440
441 return sprintf(buf, "%llu\n", val);
442}
443
444static ssize_t show_accuracy(struct device *dev,
445 struct device_attribute *devattr,
446 char *buf)
447{
448 struct acpi_device *acpi_dev = to_acpi_device(dev);
449 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
450 unsigned int acc = resource->caps.accuracy;
451
452 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
453}
454
455static ssize_t show_name(struct device *dev,
456 struct device_attribute *devattr,
457 char *buf)
458{
459 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
460}
461
3c45f2c7
KM		 462#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
463 { \
464 .label = _label, \
465 .show = _show, \
466 .index = _index, \
467 }
468
469#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
470 { \
471 .label = _label, \
472 .show = _show, \
473 .set = _set, \
474 .index = _index, \
475 }
476
de584afa 477/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
9fe789f8 478static struct sensor_template meter_attrs[] = {
3c45f2c7
KM		 479 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
480 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
481 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
482 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
483 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
3c45f2c7
KM		 484 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
485 set_avg_interval, 0),
81194cd2 486 {},
de584afa
DW		 487};
488
81194cd2 489static struct sensor_template misc_cap_attrs[] = {
3c45f2c7
KM		 490 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
491 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
492 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
493 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
81194cd2 494 {},
de584afa
DW		 495};
496
81194cd2 497static struct sensor_template ro_cap_attrs[] = {
3c45f2c7 498 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
81194cd2 499 {},
de584afa
DW		 500};
501
81194cd2 502static struct sensor_template rw_cap_attrs[] = {
3c45f2c7 503 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
81194cd2 504 {},
de584afa
DW		 505};
506
81194cd2 507static struct sensor_template trip_attrs[] = {
3c45f2c7
KM		 508 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
509 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
81194cd2 510 {},
de584afa
DW		 511};
512
81194cd2 513static struct sensor_template misc_attrs[] = {
3c45f2c7
KM		 514 RO_SENSOR_TEMPLATE("name", show_name, 0),
515 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
516 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
517 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
81194cd2 518 {},
de584afa
DW		 519};
520
3c45f2c7
KM		 521#undef RO_SENSOR_TEMPLATE
522#undef RW_SENSOR_TEMPLATE
523
de584afa
DW		 524/* Read power domain data */
525static void remove_domain_devices(struct acpi_power_meter_resource *resource)
526{
527 int i;
528
529 if (!resource->num_domain_devices)
530 return;
531
532 for (i = 0; i < resource->num_domain_devices; i++) {
533 struct acpi_device *obj = resource->domain_devices[i];
534 if (!obj)
535 continue;
536
537 sysfs_remove_link(resource->holders_dir,
538 kobject_name(&obj->dev.kobj));
539 put_device(&obj->dev);
540 }
541
542 kfree(resource->domain_devices);
543 kobject_put(resource->holders_dir);
7f07a605 544 resource->num_domain_devices = 0;
de584afa
DW		 545}
546
547static int read_domain_devices(struct acpi_power_meter_resource *resource)
548{
549 int res = 0;
550 int i;
551 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
552 union acpi_object *pss;
553 acpi_status status;
554
555 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
556 &buffer);
557 if (ACPI_FAILURE(status)) {
558 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
559 return -ENODEV;
560 }
561
562 pss = buffer.pointer;
563 if (!pss ||
564 pss->type != ACPI_TYPE_PACKAGE) {
565 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
566 "Invalid _PMD data\n");
567 res = -EFAULT;
568 goto end;
569 }
570
571 if (!pss->package.count)
572 goto end;
573
574 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
575 pss->package.count, GFP_KERNEL);
576 if (!resource->domain_devices) {
577 res = -ENOMEM;
578 goto end;
579 }
580
581 resource->holders_dir = kobject_create_and_add("measures",
582 &resource->acpi_dev->dev.kobj);
583 if (!resource->holders_dir) {
584 res = -ENOMEM;
585 goto exit_free;
586 }
587
588 resource->num_domain_devices = pss->package.count;
589
590 for (i = 0; i < pss->package.count; i++) {
591 struct acpi_device *obj;
592 union acpi_object *element = &(pss->package.elements[i]);
593
594 /* Refuse non-references */
595 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
596 continue;
597
598 /* Create a symlink to domain objects */
599 resource->domain_devices[i] = NULL;
600 status = acpi_bus_get_device(element->reference.handle,
601 &resource->domain_devices[i]);
602 if (ACPI_FAILURE(status))
603 continue;
604
605 obj = resource->domain_devices[i];
606 get_device(&obj->dev);
607
608 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
609 kobject_name(&obj->dev.kobj));
610 if (res) {
611 put_device(&obj->dev);
612 resource->domain_devices[i] = NULL;
613 }
614 }
615
616 res = 0;
617 goto end;
618
619exit_free:
620 kfree(resource->domain_devices);
621end:
622 kfree(buffer.pointer);
623 return res;
624}
625
626/* Registration and deregistration */
f49d6a7e
KM		 627static int register_attrs(struct acpi_power_meter_resource *resource,
628 struct sensor_template *attrs)
de584afa
DW		 629{
630 struct device *dev = &resource->acpi_dev->dev;
631 struct sensor_device_attribute *sensors =
632 &resource->sensors[resource->num_sensors];
633 int res = 0;
634
f49d6a7e
KM		 635 while (attrs->label) {
636 sensors->dev_attr.attr.name = attrs->label;
de584afa 637 sensors->dev_attr.attr.mode = S_IRUGO;
f49d6a7e
KM		 638 sensors->dev_attr.show = attrs->show;
639 sensors->index = attrs->index;
de584afa 640
f49d6a7e
KM		 641 if (attrs->set) {
642 sensors->dev_attr.attr.mode |= S_IWUSR;
643 sensors->dev_attr.store = attrs->set;
de584afa 644 }
de584afa 645
31e354ee 646 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 647 res = device_create_file(dev, &sensors->dev_attr);
648 if (res) {
649 sensors->dev_attr.attr.name = NULL;
650 goto error;
651 }
652 sensors++;
653 resource->num_sensors++;
f49d6a7e 654 attrs++;
de584afa
DW		 655 }
656
657error:
658 return res;
659}
660
661static void remove_attrs(struct acpi_power_meter_resource *resource)
662{
663 int i;
664
665 for (i = 0; i < resource->num_sensors; i++) {
666 if (!resource->sensors[i].dev_attr.attr.name)
667 continue;
668 device_remove_file(&resource->acpi_dev->dev,
669 &resource->sensors[i].dev_attr);
670 }
671
672 remove_domain_devices(resource);
673
674 resource->num_sensors = 0;
675}
676
677static int setup_attrs(struct acpi_power_meter_resource *resource)
678{
679 int res = 0;
680
681 res = read_domain_devices(resource);
682 if (res)
683 return res;
684
685 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
9fe789f8 686 res = register_attrs(resource, meter_attrs);
de584afa
DW		 687 if (res)
688 goto error;
689 }
690
691 if (resource->caps.flags & POWER_METER_CAN_CAP) {
692 if (!can_cap_in_hardware()) {
693 dev_err(&resource->acpi_dev->dev,
694 "Ignoring unsafe software power cap!\n");
695 goto skip_unsafe_cap;
696 }
697
7bb5ee01 698 if (resource->caps.configurable_cap)
f49d6a7e 699 res = register_attrs(resource, rw_cap_attrs);
7bb5ee01 700 else
f49d6a7e 701 res = register_attrs(resource, ro_cap_attrs);
7bb5ee01
KM		 702
703 if (res)
704 goto error;
705
f49d6a7e 706 res = register_attrs(resource, misc_cap_attrs);
de584afa
DW		 707 if (res)
708 goto error;
709 }
de584afa 710
7bb5ee01 711skip_unsafe_cap:
de584afa 712 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
f49d6a7e 713 res = register_attrs(resource, trip_attrs);
de584afa
DW		 714 if (res)
715 goto error;
716 }
717
f49d6a7e 718 res = register_attrs(resource, misc_attrs);
de584afa
DW		 719 if (res)
720 goto error;
721
722 return res;
723error:
de584afa
DW		 724 remove_attrs(resource);
725 return res;
726}
727
728static void free_capabilities(struct acpi_power_meter_resource *resource)
729{
730 acpi_string *str;
731 int i;
732
733 str = &resource->model_number;
734 for (i = 0; i < 3; i++, str++)
735 kfree(*str);
736}
737
738static int read_capabilities(struct acpi_power_meter_resource *resource)
739{
740 int res = 0;
741 int i;
742 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
743 struct acpi_buffer state = { 0, NULL };
744 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
745 union acpi_object *pss;
746 acpi_string *str;
747 acpi_status status;
748
749 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
750 &buffer);
751 if (ACPI_FAILURE(status)) {
752 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
753 return -ENODEV;
754 }
755
756 pss = buffer.pointer;
757 if (!pss ||
758 pss->type != ACPI_TYPE_PACKAGE ||
759 pss->package.count != 14) {
760 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
761 "Invalid _PMC data\n");
762 res = -EFAULT;
763 goto end;
764 }
765
766 /* Grab all the integer data at once */
767 state.length = sizeof(struct acpi_power_meter_capabilities);
768 state.pointer = &resource->caps;
769
770 status = acpi_extract_package(pss, &format, &state);
771 if (ACPI_FAILURE(status)) {
772 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
773 res = -EFAULT;
774 goto end;
775 }
776
777 if (resource->caps.units) {
778 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
779 "Unknown units %llu.\n",
780 resource->caps.units);
781 res = -EINVAL;
782 goto end;
783 }
784
785 /* Grab the string data */
786 str = &resource->model_number;
787
788 for (i = 11; i < 14; i++) {
789 union acpi_object *element = &(pss->package.elements[i]);
790
791 if (element->type != ACPI_TYPE_STRING) {
792 res = -EINVAL;
793 goto error;
794 }
795
796 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
797 GFP_KERNEL);
798 if (!*str) {
799 res = -ENOMEM;
800 goto error;
801 }
802
803 strncpy(*str, element->string.pointer, element->string.length);
804 str++;
805 }
806
807 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
808 goto end;
809error:
810 str = &resource->model_number;
811 for (i = 0; i < 3; i++, str++)
812 kfree(*str);
813end:
814 kfree(buffer.pointer);
815 return res;
816}
817
818/* Handle ACPI event notifications */
819static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
820{
821 struct acpi_power_meter_resource *resource;
822 int res;
823
824 if (!device || !acpi_driver_data(device))
825 return;
826
827 resource = acpi_driver_data(device);
828
829 mutex_lock(&resource->lock);
830 switch (event) {
831 case METER_NOTIFY_CONFIG:
832 free_capabilities(resource);
833 res = read_capabilities(resource);
834 if (res)
835 break;
836
837 remove_attrs(resource);
838 setup_attrs(resource);
839 break;
840 case METER_NOTIFY_TRIP:
841 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
842 update_meter(resource);
843 break;
844 case METER_NOTIFY_CAP:
845 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
846 update_cap(resource);
847 break;
848 case METER_NOTIFY_INTERVAL:
849 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
850 update_avg_interval(resource);
851 break;
852 case METER_NOTIFY_CAPPING:
853 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
854 dev_info(&device->dev, "Capping in progress.\n");
855 break;
856 default:
857 BUG();
858 }
859 mutex_unlock(&resource->lock);
860
861 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
862 dev_name(&device->dev), event, 0);
863}
864
865static int acpi_power_meter_add(struct acpi_device *device)
866{
867 int res;
868 struct acpi_power_meter_resource *resource;
869
870 if (!device)
871 return -EINVAL;
872
873 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
874 GFP_KERNEL);
875 if (!resource)
876 return -ENOMEM;
877
878 resource->sensors_valid = 0;
879 resource->acpi_dev = device;
880 mutex_init(&resource->lock);
881 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
882 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
883 device->driver_data = resource;
884
885 free_capabilities(resource);
886 res = read_capabilities(resource);
887 if (res)
888 goto exit_free;
889
890 resource->trip[0] = resource->trip[1] = -1;
891
892 res = setup_attrs(resource);
893 if (res)
894 goto exit_free;
895
896 resource->hwmon_dev = hwmon_device_register(&device->dev);
897 if (IS_ERR(resource->hwmon_dev)) {
898 res = PTR_ERR(resource->hwmon_dev);
899 goto exit_remove;
900 }
901
902 res = 0;
903 goto exit;
904
905exit_remove:
906 remove_attrs(resource);
907exit_free:
908 kfree(resource);
909exit:
910 return res;
911}
912
913static int acpi_power_meter_remove(struct acpi_device *device, int type)
914{
915 struct acpi_power_meter_resource *resource;
916
917 if (!device || !acpi_driver_data(device))
918 return -EINVAL;
919
920 resource = acpi_driver_data(device);
921 hwmon_device_unregister(resource->hwmon_dev);
922
923 free_capabilities(resource);
924 remove_attrs(resource);
925
926 kfree(resource);
927 return 0;
928}
929
9baeb8fd
GR		 930#ifdef CONFIG_PM_SLEEP
931
c5dec018 932static int acpi_power_meter_resume(struct device *dev)
de584afa
DW		 933{
934 struct acpi_power_meter_resource *resource;
935
c5dec018
RW		 936 if (!dev)
937 return -EINVAL;
938
939 resource = acpi_driver_data(to_acpi_device(dev));
940 if (!resource)
de584afa
DW		 941 return -EINVAL;
942
de584afa
DW		 943 free_capabilities(resource);
944 read_capabilities(resource);
945
946 return 0;
947}
948
9baeb8fd
GR		 949#endif /* CONFIG_PM_SLEEP */
950
c5dec018
RW		 951static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
952
de584afa
DW		 953static struct acpi_driver acpi_power_meter_driver = {
954 .name = "power_meter",
955 .class = ACPI_POWER_METER_CLASS,
956 .ids = power_meter_ids,
957 .ops = {
958 .add = acpi_power_meter_add,
959 .remove = acpi_power_meter_remove,
de584afa
DW		 960 .notify = acpi_power_meter_notify,
961 },
c5dec018 962 .drv.pm = &acpi_power_meter_pm,
de584afa
DW		 963};
964
965/* Module init/exit routines */
966static int __init enable_cap_knobs(const struct dmi_system_id *d)
967{
968 cap_in_hardware = 1;
969 return 0;
970}
971
972static struct dmi_system_id __initdata pm_dmi_table[] = {
973 {
974 enable_cap_knobs, "IBM Active Energy Manager",
975 {
976 DMI_MATCH(DMI_SYS_VENDOR, "IBM")
977 },
978 },
979 {}
980};
981
982static int __init acpi_power_meter_init(void)
983{
984 int result;
985
986 if (acpi_disabled)
987 return -ENODEV;
988
989 dmi_check_system(pm_dmi_table);
990
991 result = acpi_bus_register_driver(&acpi_power_meter_driver);
992 if (result < 0)
993 return -ENODEV;
994
995 return 0;
996}
997
998static void __exit acpi_power_meter_exit(void)
999{
1000 acpi_bus_unregister_driver(&acpi_power_meter_driver);
1001}
1002
1003MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1004MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
1005MODULE_LICENSE("GPL");
1006
1007module_param(force_cap_on, bool, 0644);
1008MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1009
1010module_init(acpi_power_meter_init);
1011module_exit(acpi_power_meter_exit);
ubuntu-bionic-kernel mirror