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acpi_power_meter: drop meter_rw_attrs, use common meter_attrs
[linux-2.6-block.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
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
240 temp /= 1000;
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
310 temp /= 1000;
311 if (temp < 0)
312 return -EINVAL;
313
314 mutex_lock(&resource->lock);
315 resource->trip[attr->index - 7] = temp;
316 res = set_acpi_trip(resource);
317 mutex_unlock(&resource->lock);
318
319 if (res)
320 return res;
321
322 return count;
323}
324
325/* Power meter */
326static int update_meter(struct acpi_power_meter_resource *resource)
327{
328 unsigned long long data;
329 acpi_status status;
330 unsigned long local_jiffies = jiffies;
331
332 if (time_before(local_jiffies, resource->sensors_last_updated +
333 msecs_to_jiffies(resource->caps.sampling_time)) &&
334 resource->sensors_valid)
335 return 0;
336
337 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
338 NULL, &data);
339 if (ACPI_FAILURE(status)) {
340 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
341 return -ENODEV;
342 }
343
344 resource->power = data;
345 resource->sensors_valid = 1;
346 resource->sensors_last_updated = jiffies;
347 return 0;
348}
349
350static ssize_t show_power(struct device *dev,
351 struct device_attribute *devattr,
352 char *buf)
353{
354 struct acpi_device *acpi_dev = to_acpi_device(dev);
355 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
356
357 mutex_lock(&resource->lock);
358 update_meter(resource);
359 mutex_unlock(&resource->lock);
360
361 return sprintf(buf, "%llu\n", resource->power * 1000);
362}
363
364/* Miscellaneous */
365static ssize_t show_str(struct device *dev,
366 struct device_attribute *devattr,
367 char *buf)
368{
369 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
370 struct acpi_device *acpi_dev = to_acpi_device(dev);
371 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
372 acpi_string val;
373
374 switch (attr->index) {
375 case 0:
376 val = resource->model_number;
377 break;
378 case 1:
379 val = resource->serial_number;
380 break;
381 case 2:
382 val = resource->oem_info;
383 break;
384 default:
385 BUG();
776cdc11 386 val = "";
de584afa
DW		 387 }
388
389 return sprintf(buf, "%s\n", val);
390}
391
392static ssize_t show_val(struct device *dev,
393 struct device_attribute *devattr,
394 char *buf)
395{
396 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
439913ff 399 u64 val = 0;
de584afa
DW		 400
401 switch (attr->index) {
402 case 0:
403 val = resource->caps.min_avg_interval;
404 break;
405 case 1:
406 val = resource->caps.max_avg_interval;
407 break;
408 case 2:
409 val = resource->caps.min_cap * 1000;
410 break;
411 case 3:
412 val = resource->caps.max_cap * 1000;
413 break;
414 case 4:
415 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
416 return sprintf(buf, "unknown\n");
417
418 val = resource->caps.hysteresis * 1000;
419 break;
420 case 5:
421 if (resource->caps.flags & POWER_METER_IS_BATTERY)
422 val = 1;
423 else
424 val = 0;
425 break;
426 case 6:
427 if (resource->power > resource->cap)
428 val = 1;
429 else
430 val = 0;
431 break;
432 case 7:
433 case 8:
434 if (resource->trip[attr->index - 7] < 0)
435 return sprintf(buf, "unknown\n");
436
437 val = resource->trip[attr->index - 7] * 1000;
438 break;
439 default:
440 BUG();
441 }
442
443 return sprintf(buf, "%llu\n", val);
444}
445
446static ssize_t show_accuracy(struct device *dev,
447 struct device_attribute *devattr,
448 char *buf)
449{
450 struct acpi_device *acpi_dev = to_acpi_device(dev);
451 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
452 unsigned int acc = resource->caps.accuracy;
453
454 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
455}
456
457static ssize_t show_name(struct device *dev,
458 struct device_attribute *devattr,
459 char *buf)
460{
461 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
462}
463
3c45f2c7
KM		 464#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
465 { \
466 .label = _label, \
467 .show = _show, \
468 .index = _index, \
469 }
470
471#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
472 { \
473 .label = _label, \
474 .show = _show, \
475 .set = _set, \
476 .index = _index, \
477 }
478
de584afa 479/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
9fe789f8 480static struct sensor_template meter_attrs[] = {
3c45f2c7
KM		 481 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
482 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
483 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
484 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
485 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
3c45f2c7
KM		 486 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
487 set_avg_interval, 0),
81194cd2 488 {},
de584afa
DW		 489};
490
81194cd2 491static struct sensor_template misc_cap_attrs[] = {
3c45f2c7
KM		 492 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
493 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
494 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
495 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
81194cd2 496 {},
de584afa
DW		 497};
498
81194cd2 499static struct sensor_template ro_cap_attrs[] = {
3c45f2c7 500 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
81194cd2 501 {},
de584afa
DW		 502};
503
81194cd2 504static struct sensor_template rw_cap_attrs[] = {
3c45f2c7 505 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
81194cd2 506 {},
de584afa
DW		 507};
508
81194cd2 509static struct sensor_template trip_attrs[] = {
3c45f2c7
KM		 510 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
511 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
81194cd2 512 {},
de584afa
DW		 513};
514
81194cd2 515static struct sensor_template misc_attrs[] = {
3c45f2c7
KM		 516 RO_SENSOR_TEMPLATE("name", show_name, 0),
517 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
518 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
519 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
81194cd2 520 {},
de584afa
DW		 521};
522
3c45f2c7
KM		 523#undef RO_SENSOR_TEMPLATE
524#undef RW_SENSOR_TEMPLATE
525
de584afa
DW		 526/* Read power domain data */
527static void remove_domain_devices(struct acpi_power_meter_resource *resource)
528{
529 int i;
530
531 if (!resource->num_domain_devices)
532 return;
533
534 for (i = 0; i < resource->num_domain_devices; i++) {
535 struct acpi_device *obj = resource->domain_devices[i];
536 if (!obj)
537 continue;
538
539 sysfs_remove_link(resource->holders_dir,
540 kobject_name(&obj->dev.kobj));
541 put_device(&obj->dev);
542 }
543
544 kfree(resource->domain_devices);
545 kobject_put(resource->holders_dir);
7f07a605 546 resource->num_domain_devices = 0;
de584afa
DW		 547}
548
549static int read_domain_devices(struct acpi_power_meter_resource *resource)
550{
551 int res = 0;
552 int i;
553 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
554 union acpi_object *pss;
555 acpi_status status;
556
557 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
558 &buffer);
559 if (ACPI_FAILURE(status)) {
560 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
561 return -ENODEV;
562 }
563
564 pss = buffer.pointer;
565 if (!pss ||
566 pss->type != ACPI_TYPE_PACKAGE) {
567 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
568 "Invalid _PMD data\n");
569 res = -EFAULT;
570 goto end;
571 }
572
573 if (!pss->package.count)
574 goto end;
575
576 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
577 pss->package.count, GFP_KERNEL);
578 if (!resource->domain_devices) {
579 res = -ENOMEM;
580 goto end;
581 }
582
583 resource->holders_dir = kobject_create_and_add("measures",
584 &resource->acpi_dev->dev.kobj);
585 if (!resource->holders_dir) {
586 res = -ENOMEM;
587 goto exit_free;
588 }
589
590 resource->num_domain_devices = pss->package.count;
591
592 for (i = 0; i < pss->package.count; i++) {
593 struct acpi_device *obj;
594 union acpi_object *element = &(pss->package.elements[i]);
595
596 /* Refuse non-references */
597 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
598 continue;
599
600 /* Create a symlink to domain objects */
601 resource->domain_devices[i] = NULL;
602 status = acpi_bus_get_device(element->reference.handle,
603 &resource->domain_devices[i]);
604 if (ACPI_FAILURE(status))
605 continue;
606
607 obj = resource->domain_devices[i];
608 get_device(&obj->dev);
609
610 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
611 kobject_name(&obj->dev.kobj));
612 if (res) {
613 put_device(&obj->dev);
614 resource->domain_devices[i] = NULL;
615 }
616 }
617
618 res = 0;
619 goto end;
620
621exit_free:
622 kfree(resource->domain_devices);
623end:
624 kfree(buffer.pointer);
625 return res;
626}
627
628/* Registration and deregistration */
f49d6a7e
KM		 629static int register_attrs(struct acpi_power_meter_resource *resource,
630 struct sensor_template *attrs)
de584afa
DW		 631{
632 struct device *dev = &resource->acpi_dev->dev;
633 struct sensor_device_attribute *sensors =
634 &resource->sensors[resource->num_sensors];
635 int res = 0;
636
f49d6a7e
KM		 637 while (attrs->label) {
638 sensors->dev_attr.attr.name = attrs->label;
de584afa 639 sensors->dev_attr.attr.mode = S_IRUGO;
f49d6a7e
KM		 640 sensors->dev_attr.show = attrs->show;
641 sensors->index = attrs->index;
de584afa 642
f49d6a7e
KM		 643 if (attrs->set) {
644 sensors->dev_attr.attr.mode |= S_IWUSR;
645 sensors->dev_attr.store = attrs->set;
de584afa 646 }
de584afa 647
31e354ee 648 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 649 res = device_create_file(dev, &sensors->dev_attr);
650 if (res) {
651 sensors->dev_attr.attr.name = NULL;
652 goto error;
653 }
654 sensors++;
655 resource->num_sensors++;
f49d6a7e 656 attrs++;
de584afa
DW		 657 }
658
659error:
660 return res;
661}
662
663static void remove_attrs(struct acpi_power_meter_resource *resource)
664{
665 int i;
666
667 for (i = 0; i < resource->num_sensors; i++) {
668 if (!resource->sensors[i].dev_attr.attr.name)
669 continue;
670 device_remove_file(&resource->acpi_dev->dev,
671 &resource->sensors[i].dev_attr);
672 }
673
674 remove_domain_devices(resource);
675
676 resource->num_sensors = 0;
677}
678
679static int setup_attrs(struct acpi_power_meter_resource *resource)
680{
681 int res = 0;
682
683 res = read_domain_devices(resource);
684 if (res)
685 return res;
686
687 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
9fe789f8 688 res = register_attrs(resource, meter_attrs);
de584afa
DW		 689 if (res)
690 goto error;
691 }
692
693 if (resource->caps.flags & POWER_METER_CAN_CAP) {
694 if (!can_cap_in_hardware()) {
695 dev_err(&resource->acpi_dev->dev,
696 "Ignoring unsafe software power cap!\n");
697 goto skip_unsafe_cap;
698 }
699
700 if (resource->caps.configurable_cap) {
f49d6a7e 701 res = register_attrs(resource, rw_cap_attrs);
de584afa
DW		 702 if (res)
703 goto error;
704 } else {
f49d6a7e 705 res = register_attrs(resource, ro_cap_attrs);
de584afa
DW		 706 if (res)
707 goto error;
708 }
f49d6a7e 709 res = register_attrs(resource, misc_cap_attrs);
de584afa
DW		 710 if (res)
711 goto error;
712 }
713skip_unsafe_cap:
714
715 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
f49d6a7e 716 res = register_attrs(resource, trip_attrs);
de584afa
DW		 717 if (res)
718 goto error;
719 }
720
f49d6a7e 721 res = register_attrs(resource, misc_attrs);
de584afa
DW		 722 if (res)
723 goto error;
724
725 return res;
726error:
de584afa
DW		 727 remove_attrs(resource);
728 return res;
729}
730
731static void free_capabilities(struct acpi_power_meter_resource *resource)
732{
733 acpi_string *str;
734 int i;
735
736 str = &resource->model_number;
737 for (i = 0; i < 3; i++, str++)
738 kfree(*str);
739}
740
741static int read_capabilities(struct acpi_power_meter_resource *resource)
742{
743 int res = 0;
744 int i;
745 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
746 struct acpi_buffer state = { 0, NULL };
747 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
748 union acpi_object *pss;
749 acpi_string *str;
750 acpi_status status;
751
752 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
753 &buffer);
754 if (ACPI_FAILURE(status)) {
755 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
756 return -ENODEV;
757 }
758
759 pss = buffer.pointer;
760 if (!pss ||
761 pss->type != ACPI_TYPE_PACKAGE ||
762 pss->package.count != 14) {
763 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
764 "Invalid _PMC data\n");
765 res = -EFAULT;
766 goto end;
767 }
768
769 /* Grab all the integer data at once */
770 state.length = sizeof(struct acpi_power_meter_capabilities);
771 state.pointer = &resource->caps;
772
773 status = acpi_extract_package(pss, &format, &state);
774 if (ACPI_FAILURE(status)) {
775 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
776 res = -EFAULT;
777 goto end;
778 }
779
780 if (resource->caps.units) {
781 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
782 "Unknown units %llu.\n",
783 resource->caps.units);
784 res = -EINVAL;
785 goto end;
786 }
787
788 /* Grab the string data */
789 str = &resource->model_number;
790
791 for (i = 11; i < 14; i++) {
792 union acpi_object *element = &(pss->package.elements[i]);
793
794 if (element->type != ACPI_TYPE_STRING) {
795 res = -EINVAL;
796 goto error;
797 }
798
799 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
800 GFP_KERNEL);
801 if (!*str) {
802 res = -ENOMEM;
803 goto error;
804 }
805
806 strncpy(*str, element->string.pointer, element->string.length);
807 str++;
808 }
809
810 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
811 goto end;
812error:
813 str = &resource->model_number;
814 for (i = 0; i < 3; i++, str++)
815 kfree(*str);
816end:
817 kfree(buffer.pointer);
818 return res;
819}
820
821/* Handle ACPI event notifications */
822static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
823{
824 struct acpi_power_meter_resource *resource;
825 int res;
826
827 if (!device || !acpi_driver_data(device))
828 return;
829
830 resource = acpi_driver_data(device);
831
832 mutex_lock(&resource->lock);
833 switch (event) {
834 case METER_NOTIFY_CONFIG:
835 free_capabilities(resource);
836 res = read_capabilities(resource);
837 if (res)
838 break;
839
840 remove_attrs(resource);
841 setup_attrs(resource);
842 break;
843 case METER_NOTIFY_TRIP:
844 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
845 update_meter(resource);
846 break;
847 case METER_NOTIFY_CAP:
848 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
849 update_cap(resource);
850 break;
851 case METER_NOTIFY_INTERVAL:
852 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
853 update_avg_interval(resource);
854 break;
855 case METER_NOTIFY_CAPPING:
856 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
857 dev_info(&device->dev, "Capping in progress.\n");
858 break;
859 default:
860 BUG();
861 }
862 mutex_unlock(&resource->lock);
863
864 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
865 dev_name(&device->dev), event, 0);
866}
867
868static int acpi_power_meter_add(struct acpi_device *device)
869{
870 int res;
871 struct acpi_power_meter_resource *resource;
872
873 if (!device)
874 return -EINVAL;
875
876 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
877 GFP_KERNEL);
878 if (!resource)
879 return -ENOMEM;
880
881 resource->sensors_valid = 0;
882 resource->acpi_dev = device;
883 mutex_init(&resource->lock);
884 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
885 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
886 device->driver_data = resource;
887
888 free_capabilities(resource);
889 res = read_capabilities(resource);
890 if (res)
891 goto exit_free;
892
893 resource->trip[0] = resource->trip[1] = -1;
894
895 res = setup_attrs(resource);
896 if (res)
897 goto exit_free;
898
899 resource->hwmon_dev = hwmon_device_register(&device->dev);
900 if (IS_ERR(resource->hwmon_dev)) {
901 res = PTR_ERR(resource->hwmon_dev);
902 goto exit_remove;
903 }
904
905 res = 0;
906 goto exit;
907
908exit_remove:
909 remove_attrs(resource);
910exit_free:
911 kfree(resource);
912exit:
913 return res;
914}
915
916static int acpi_power_meter_remove(struct acpi_device *device, int type)
917{
918 struct acpi_power_meter_resource *resource;
919
920 if (!device || !acpi_driver_data(device))
921 return -EINVAL;
922
923 resource = acpi_driver_data(device);
924 hwmon_device_unregister(resource->hwmon_dev);
925
926 free_capabilities(resource);
927 remove_attrs(resource);
928
929 kfree(resource);
930 return 0;
931}
932
933static int acpi_power_meter_resume(struct acpi_device *device)
934{
935 struct acpi_power_meter_resource *resource;
936
937 if (!device || !acpi_driver_data(device))
938 return -EINVAL;
939
940 resource = acpi_driver_data(device);
941 free_capabilities(resource);
942 read_capabilities(resource);
943
944 return 0;
945}
946
947static struct acpi_driver acpi_power_meter_driver = {
948 .name = "power_meter",
949 .class = ACPI_POWER_METER_CLASS,
950 .ids = power_meter_ids,
951 .ops = {
952 .add = acpi_power_meter_add,
953 .remove = acpi_power_meter_remove,
954 .resume = acpi_power_meter_resume,
955 .notify = acpi_power_meter_notify,
956 },
957};
958
959/* Module init/exit routines */
960static int __init enable_cap_knobs(const struct dmi_system_id *d)
961{
962 cap_in_hardware = 1;
963 return 0;
964}
965
966static struct dmi_system_id __initdata pm_dmi_table[] = {
967 {
968 enable_cap_knobs, "IBM Active Energy Manager",
969 {
970 DMI_MATCH(DMI_SYS_VENDOR, "IBM")
971 },
972 },
973 {}
974};
975
976static int __init acpi_power_meter_init(void)
977{
978 int result;
979
980 if (acpi_disabled)
981 return -ENODEV;
982
983 dmi_check_system(pm_dmi_table);
984
985 result = acpi_bus_register_driver(&acpi_power_meter_driver);
986 if (result < 0)
987 return -ENODEV;
988
989 return 0;
990}
991
992static void __exit acpi_power_meter_exit(void)
993{
994 acpi_bus_unregister_driver(&acpi_power_meter_driver);
995}
996
997MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
998MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
999MODULE_LICENSE("GPL");
1000
1001module_param(force_cap_on, bool, 0644);
1002MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1003
1004module_init(acpi_power_meter_init);
1005module_exit(acpi_power_meter_exit);
Linux 6.x block layer and io_uring tree(s)