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Merge tag 'spi-v3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
[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 *
5407e051 5 * Author: Darrick J. Wong <darrick.wong@oracle.com>
de584afa
DW		 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>
fa845740 32#include <linux/err.h>
de584afa
DW		 33#include <acpi/acpi_drivers.h>
34#include <acpi/acpi_bus.h>
35
36#define ACPI_POWER_METER_NAME "power_meter"
37ACPI_MODULE_NAME(ACPI_POWER_METER_NAME);
38#define ACPI_POWER_METER_DEVICE_NAME "Power Meter"
18262714 39#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
de584afa
DW		 40
41#define NUM_SENSORS 17
42
43#define POWER_METER_CAN_MEASURE (1 << 0)
44#define POWER_METER_CAN_TRIP (1 << 1)
45#define POWER_METER_CAN_CAP (1 << 2)
46#define POWER_METER_CAN_NOTIFY (1 << 3)
47#define POWER_METER_IS_BATTERY (1 << 8)
48#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
49
50#define METER_NOTIFY_CONFIG 0x80
51#define METER_NOTIFY_TRIP 0x81
52#define METER_NOTIFY_CAP 0x82
53#define METER_NOTIFY_CAPPING 0x83
54#define METER_NOTIFY_INTERVAL 0x84
55
56#define POWER_AVERAGE_NAME "power1_average"
57#define POWER_CAP_NAME "power1_cap"
58#define POWER_AVG_INTERVAL_NAME "power1_average_interval"
59#define POWER_ALARM_NAME "power1_alarm"
60
61static int cap_in_hardware;
90ab5ee9 62static bool force_cap_on;
de584afa
DW		 63
64static int can_cap_in_hardware(void)
65{
66 return force_cap_on || cap_in_hardware;
67}
68
c97adf9e 69static const struct acpi_device_id power_meter_ids[] = {
de584afa
DW		 70 {"ACPI000D", 0},
71 {"", 0},
72};
73MODULE_DEVICE_TABLE(acpi, power_meter_ids);
74
75struct acpi_power_meter_capabilities {
439913ff
LM		 76 u64 flags;
77 u64 units;
78 u64 type;
79 u64 accuracy;
80 u64 sampling_time;
81 u64 min_avg_interval;
82 u64 max_avg_interval;
83 u64 hysteresis;
84 u64 configurable_cap;
85 u64 min_cap;
86 u64 max_cap;
de584afa
DW		 87};
88
89struct acpi_power_meter_resource {
90 struct acpi_device *acpi_dev;
91 acpi_bus_id name;
92 struct mutex lock;
93 struct device *hwmon_dev;
94 struct acpi_power_meter_capabilities caps;
95 acpi_string model_number;
96 acpi_string serial_number;
97 acpi_string oem_info;
439913ff
LM		 98 u64 power;
99 u64 cap;
100 u64 avg_interval;
de584afa
DW		 101 int sensors_valid;
102 unsigned long sensors_last_updated;
103 struct sensor_device_attribute sensors[NUM_SENSORS];
104 int num_sensors;
75311bea 105 s64 trip[2];
de584afa
DW		 106 int num_domain_devices;
107 struct acpi_device **domain_devices;
108 struct kobject *holders_dir;
109};
110
81194cd2 111struct sensor_template {
de584afa
DW		 112 char *label;
113 ssize_t (*show)(struct device *dev,
114 struct device_attribute *devattr,
115 char *buf);
116 ssize_t (*set)(struct device *dev,
117 struct device_attribute *devattr,
118 const char *buf, size_t count);
119 int index;
120};
121
122/* Averaging interval */
123static int update_avg_interval(struct acpi_power_meter_resource *resource)
124{
125 unsigned long long data;
126 acpi_status status;
127
128 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI",
129 NULL, &data);
130 if (ACPI_FAILURE(status)) {
131 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI"));
132 return -ENODEV;
133 }
134
135 resource->avg_interval = data;
136 return 0;
137}
138
139static ssize_t show_avg_interval(struct device *dev,
140 struct device_attribute *devattr,
141 char *buf)
142{
143 struct acpi_device *acpi_dev = to_acpi_device(dev);
144 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
145
146 mutex_lock(&resource->lock);
147 update_avg_interval(resource);
148 mutex_unlock(&resource->lock);
149
150 return sprintf(buf, "%llu\n", resource->avg_interval);
151}
152
153static ssize_t set_avg_interval(struct device *dev,
154 struct device_attribute *devattr,
155 const char *buf, size_t count)
156{
157 struct acpi_device *acpi_dev = to_acpi_device(dev);
158 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
159 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
160 struct acpi_object_list args = { 1, &arg0 };
161 int res;
162 unsigned long temp;
163 unsigned long long data;
164 acpi_status status;
165
179c4fdb 166 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 167 if (res)
168 return res;
169
170 if (temp > resource->caps.max_avg_interval ||
171 temp < resource->caps.min_avg_interval)
172 return -EINVAL;
173 arg0.integer.value = temp;
174
175 mutex_lock(&resource->lock);
176 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI",
177 &args, &data);
178 if (!ACPI_FAILURE(status))
179 resource->avg_interval = temp;
180 mutex_unlock(&resource->lock);
181
182 if (ACPI_FAILURE(status)) {
183 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI"));
184 return -EINVAL;
185 }
186
187 /* _PAI returns 0 on success, nonzero otherwise */
188 if (data)
189 return -EINVAL;
190
191 return count;
192}
193
194/* Cap functions */
195static int update_cap(struct acpi_power_meter_resource *resource)
196{
197 unsigned long long data;
198 acpi_status status;
199
200 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL",
201 NULL, &data);
202 if (ACPI_FAILURE(status)) {
203 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL"));
204 return -ENODEV;
205 }
206
207 resource->cap = data;
208 return 0;
209}
210
211static ssize_t show_cap(struct device *dev,
212 struct device_attribute *devattr,
213 char *buf)
214{
215 struct acpi_device *acpi_dev = to_acpi_device(dev);
216 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
217
218 mutex_lock(&resource->lock);
219 update_cap(resource);
220 mutex_unlock(&resource->lock);
221
222 return sprintf(buf, "%llu\n", resource->cap * 1000);
223}
224
225static ssize_t set_cap(struct device *dev, struct device_attribute *devattr,
226 const char *buf, size_t count)
227{
228 struct acpi_device *acpi_dev = to_acpi_device(dev);
229 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
230 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
231 struct acpi_object_list args = { 1, &arg0 };
232 int res;
233 unsigned long temp;
234 unsigned long long data;
235 acpi_status status;
236
179c4fdb 237 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 238 if (res)
239 return res;
240
27c4db39 241 temp = DIV_ROUND_CLOSEST(temp, 1000);
de584afa
DW		 242 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap)
243 return -EINVAL;
244 arg0.integer.value = temp;
245
246 mutex_lock(&resource->lock);
247 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL",
248 &args, &data);
249 if (!ACPI_FAILURE(status))
250 resource->cap = temp;
251 mutex_unlock(&resource->lock);
252
253 if (ACPI_FAILURE(status)) {
254 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL"));
255 return -EINVAL;
256 }
257
258 /* _SHL returns 0 on success, nonzero otherwise */
259 if (data)
260 return -EINVAL;
261
262 return count;
263}
264
265/* Power meter trip points */
266static int set_acpi_trip(struct acpi_power_meter_resource *resource)
267{
268 union acpi_object arg_objs[] = {
269 {ACPI_TYPE_INTEGER},
270 {ACPI_TYPE_INTEGER}
271 };
272 struct acpi_object_list args = { 2, arg_objs };
273 unsigned long long data;
274 acpi_status status;
275
276 /* Both trip levels must be set */
277 if (resource->trip[0] < 0 || resource->trip[1] < 0)
278 return 0;
279
280 /* This driver stores min, max; ACPI wants max, min. */
281 arg_objs[0].integer.value = resource->trip[1];
282 arg_objs[1].integer.value = resource->trip[0];
283
284 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP",
285 &args, &data);
286 if (ACPI_FAILURE(status)) {
287 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP"));
288 return -EINVAL;
289 }
290
22aecebf
DW		 291 /* _PTP returns 0 on success, nonzero otherwise */
292 if (data)
293 return -EINVAL;
294
295 return 0;
de584afa
DW		 296}
297
298static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
299 const char *buf, size_t count)
300{
301 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
302 struct acpi_device *acpi_dev = to_acpi_device(dev);
303 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
304 int res;
305 unsigned long temp;
306
179c4fdb 307 res = kstrtoul(buf, 10, &temp);
de584afa
DW		 308 if (res)
309 return res;
310
27c4db39 311 temp = DIV_ROUND_CLOSEST(temp, 1000);
de584afa
DW		 312
313 mutex_lock(&resource->lock);
314 resource->trip[attr->index - 7] = temp;
315 res = set_acpi_trip(resource);
316 mutex_unlock(&resource->lock);
317
318 if (res)
319 return res;
320
321 return count;
322}
323
324/* Power meter */
325static int update_meter(struct acpi_power_meter_resource *resource)
326{
327 unsigned long long data;
328 acpi_status status;
329 unsigned long local_jiffies = jiffies;
330
331 if (time_before(local_jiffies, resource->sensors_last_updated +
332 msecs_to_jiffies(resource->caps.sampling_time)) &&
333 resource->sensors_valid)
334 return 0;
335
336 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM",
337 NULL, &data);
338 if (ACPI_FAILURE(status)) {
339 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM"));
340 return -ENODEV;
341 }
342
343 resource->power = data;
344 resource->sensors_valid = 1;
345 resource->sensors_last_updated = jiffies;
346 return 0;
347}
348
349static ssize_t show_power(struct device *dev,
350 struct device_attribute *devattr,
351 char *buf)
352{
353 struct acpi_device *acpi_dev = to_acpi_device(dev);
354 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
355
356 mutex_lock(&resource->lock);
357 update_meter(resource);
358 mutex_unlock(&resource->lock);
359
360 return sprintf(buf, "%llu\n", resource->power * 1000);
361}
362
363/* Miscellaneous */
364static ssize_t show_str(struct device *dev,
365 struct device_attribute *devattr,
366 char *buf)
367{
368 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
369 struct acpi_device *acpi_dev = to_acpi_device(dev);
370 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
371 acpi_string val;
372
373 switch (attr->index) {
374 case 0:
375 val = resource->model_number;
376 break;
377 case 1:
378 val = resource->serial_number;
379 break;
380 case 2:
381 val = resource->oem_info;
382 break;
383 default:
83c97fe1
GR		 384 WARN(1, "Implementation error: unexpected attribute index %d\n",
385 attr->index);
776cdc11 386 val = "";
83c97fe1 387 break;
de584afa
DW		 388 }
389
390 return sprintf(buf, "%s\n", val);
391}
392
393static ssize_t show_val(struct device *dev,
394 struct device_attribute *devattr,
395 char *buf)
396{
397 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
398 struct acpi_device *acpi_dev = to_acpi_device(dev);
399 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
439913ff 400 u64 val = 0;
de584afa
DW		 401
402 switch (attr->index) {
403 case 0:
404 val = resource->caps.min_avg_interval;
405 break;
406 case 1:
407 val = resource->caps.max_avg_interval;
408 break;
409 case 2:
410 val = resource->caps.min_cap * 1000;
411 break;
412 case 3:
413 val = resource->caps.max_cap * 1000;
414 break;
415 case 4:
416 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
417 return sprintf(buf, "unknown\n");
418
419 val = resource->caps.hysteresis * 1000;
420 break;
421 case 5:
422 if (resource->caps.flags & POWER_METER_IS_BATTERY)
423 val = 1;
424 else
425 val = 0;
426 break;
427 case 6:
428 if (resource->power > resource->cap)
429 val = 1;
430 else
431 val = 0;
432 break;
433 case 7:
434 case 8:
435 if (resource->trip[attr->index - 7] < 0)
436 return sprintf(buf, "unknown\n");
437
438 val = resource->trip[attr->index - 7] * 1000;
439 break;
440 default:
83c97fe1
GR		 441 WARN(1, "Implementation error: unexpected attribute index %d\n",
442 attr->index);
443 break;
de584afa
DW		 444 }
445
446 return sprintf(buf, "%llu\n", val);
447}
448
449static ssize_t show_accuracy(struct device *dev,
450 struct device_attribute *devattr,
451 char *buf)
452{
453 struct acpi_device *acpi_dev = to_acpi_device(dev);
454 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
455 unsigned int acc = resource->caps.accuracy;
456
457 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
458}
459
460static ssize_t show_name(struct device *dev,
461 struct device_attribute *devattr,
462 char *buf)
463{
464 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
465}
466
3c45f2c7
KM		 467#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
468 { \
469 .label = _label, \
470 .show = _show, \
471 .index = _index, \
472 }
473
474#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
475 { \
476 .label = _label, \
477 .show = _show, \
478 .set = _set, \
479 .index = _index, \
480 }
481
de584afa 482/* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */
9fe789f8 483static struct sensor_template meter_attrs[] = {
3c45f2c7
KM		 484 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
485 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
486 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
487 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
488 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
3c45f2c7
KM		 489 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
490 set_avg_interval, 0),
81194cd2 491 {},
de584afa
DW		 492};
493
81194cd2 494static struct sensor_template misc_cap_attrs[] = {
3c45f2c7
KM		 495 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
496 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
497 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
498 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
81194cd2 499 {},
de584afa
DW		 500};
501
81194cd2 502static struct sensor_template ro_cap_attrs[] = {
3c45f2c7 503 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
81194cd2 504 {},
de584afa
DW		 505};
506
81194cd2 507static struct sensor_template rw_cap_attrs[] = {
3c45f2c7 508 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
81194cd2 509 {},
de584afa
DW		 510};
511
81194cd2 512static struct sensor_template trip_attrs[] = {
3c45f2c7
KM		 513 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
514 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
81194cd2 515 {},
de584afa
DW		 516};
517
81194cd2 518static struct sensor_template misc_attrs[] = {
3c45f2c7
KM		 519 RO_SENSOR_TEMPLATE("name", show_name, 0),
520 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
521 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
522 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
81194cd2 523 {},
de584afa
DW		 524};
525
3c45f2c7
KM		 526#undef RO_SENSOR_TEMPLATE
527#undef RW_SENSOR_TEMPLATE
528
de584afa
DW		 529/* Read power domain data */
530static void remove_domain_devices(struct acpi_power_meter_resource *resource)
531{
532 int i;
533
534 if (!resource->num_domain_devices)
535 return;
536
537 for (i = 0; i < resource->num_domain_devices; i++) {
538 struct acpi_device *obj = resource->domain_devices[i];
539 if (!obj)
540 continue;
541
542 sysfs_remove_link(resource->holders_dir,
543 kobject_name(&obj->dev.kobj));
544 put_device(&obj->dev);
545 }
546
547 kfree(resource->domain_devices);
548 kobject_put(resource->holders_dir);
7f07a605 549 resource->num_domain_devices = 0;
de584afa
DW		 550}
551
552static int read_domain_devices(struct acpi_power_meter_resource *resource)
553{
554 int res = 0;
555 int i;
556 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
557 union acpi_object *pss;
558 acpi_status status;
559
560 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
561 &buffer);
562 if (ACPI_FAILURE(status)) {
563 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
564 return -ENODEV;
565 }
566
567 pss = buffer.pointer;
568 if (!pss ||
569 pss->type != ACPI_TYPE_PACKAGE) {
570 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
571 "Invalid _PMD data\n");
572 res = -EFAULT;
573 goto end;
574 }
575
576 if (!pss->package.count)
577 goto end;
578
579 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
580 pss->package.count, GFP_KERNEL);
581 if (!resource->domain_devices) {
582 res = -ENOMEM;
583 goto end;
584 }
585
586 resource->holders_dir = kobject_create_and_add("measures",
587 &resource->acpi_dev->dev.kobj);
588 if (!resource->holders_dir) {
589 res = -ENOMEM;
590 goto exit_free;
591 }
592
593 resource->num_domain_devices = pss->package.count;
594
595 for (i = 0; i < pss->package.count; i++) {
596 struct acpi_device *obj;
597 union acpi_object *element = &(pss->package.elements[i]);
598
599 /* Refuse non-references */
600 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
601 continue;
602
603 /* Create a symlink to domain objects */
604 resource->domain_devices[i] = NULL;
605 status = acpi_bus_get_device(element->reference.handle,
606 &resource->domain_devices[i]);
607 if (ACPI_FAILURE(status))
608 continue;
609
610 obj = resource->domain_devices[i];
611 get_device(&obj->dev);
612
613 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
614 kobject_name(&obj->dev.kobj));
615 if (res) {
616 put_device(&obj->dev);
617 resource->domain_devices[i] = NULL;
618 }
619 }
620
621 res = 0;
622 goto end;
623
624exit_free:
625 kfree(resource->domain_devices);
626end:
627 kfree(buffer.pointer);
628 return res;
629}
630
631/* Registration and deregistration */
f49d6a7e
KM		 632static int register_attrs(struct acpi_power_meter_resource *resource,
633 struct sensor_template *attrs)
de584afa
DW		 634{
635 struct device *dev = &resource->acpi_dev->dev;
636 struct sensor_device_attribute *sensors =
637 &resource->sensors[resource->num_sensors];
638 int res = 0;
639
f49d6a7e
KM		 640 while (attrs->label) {
641 sensors->dev_attr.attr.name = attrs->label;
de584afa 642 sensors->dev_attr.attr.mode = S_IRUGO;
f49d6a7e
KM		 643 sensors->dev_attr.show = attrs->show;
644 sensors->index = attrs->index;
de584afa 645
f49d6a7e
KM		 646 if (attrs->set) {
647 sensors->dev_attr.attr.mode |= S_IWUSR;
648 sensors->dev_attr.store = attrs->set;
de584afa 649 }
de584afa 650
31e354ee 651 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 652 res = device_create_file(dev, &sensors->dev_attr);
653 if (res) {
654 sensors->dev_attr.attr.name = NULL;
655 goto error;
656 }
657 sensors++;
658 resource->num_sensors++;
f49d6a7e 659 attrs++;
de584afa
DW		 660 }
661
662error:
663 return res;
664}
665
666static void remove_attrs(struct acpi_power_meter_resource *resource)
667{
668 int i;
669
670 for (i = 0; i < resource->num_sensors; i++) {
671 if (!resource->sensors[i].dev_attr.attr.name)
672 continue;
673 device_remove_file(&resource->acpi_dev->dev,
674 &resource->sensors[i].dev_attr);
675 }
676
677 remove_domain_devices(resource);
678
679 resource->num_sensors = 0;
680}
681
682static int setup_attrs(struct acpi_power_meter_resource *resource)
683{
684 int res = 0;
685
686 res = read_domain_devices(resource);
687 if (res)
688 return res;
689
690 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
9fe789f8 691 res = register_attrs(resource, meter_attrs);
de584afa
DW		 692 if (res)
693 goto error;
694 }
695
696 if (resource->caps.flags & POWER_METER_CAN_CAP) {
697 if (!can_cap_in_hardware()) {
698 dev_err(&resource->acpi_dev->dev,
699 "Ignoring unsafe software power cap!\n");
700 goto skip_unsafe_cap;
701 }
702
7bb5ee01 703 if (resource->caps.configurable_cap)
f49d6a7e 704 res = register_attrs(resource, rw_cap_attrs);
7bb5ee01 705 else
f49d6a7e 706 res = register_attrs(resource, ro_cap_attrs);
7bb5ee01
KM		 707
708 if (res)
709 goto error;
710
f49d6a7e 711 res = register_attrs(resource, misc_cap_attrs);
de584afa
DW		 712 if (res)
713 goto error;
714 }
de584afa 715
7bb5ee01 716skip_unsafe_cap:
de584afa 717 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
f49d6a7e 718 res = register_attrs(resource, trip_attrs);
de584afa
DW		 719 if (res)
720 goto error;
721 }
722
f49d6a7e 723 res = register_attrs(resource, misc_attrs);
de584afa
DW		 724 if (res)
725 goto error;
726
727 return res;
728error:
de584afa
DW		 729 remove_attrs(resource);
730 return res;
731}
732
733static void free_capabilities(struct acpi_power_meter_resource *resource)
734{
735 acpi_string *str;
736 int i;
737
738 str = &resource->model_number;
739 for (i = 0; i < 3; i++, str++)
740 kfree(*str);
741}
742
743static int read_capabilities(struct acpi_power_meter_resource *resource)
744{
745 int res = 0;
746 int i;
747 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
748 struct acpi_buffer state = { 0, NULL };
749 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
750 union acpi_object *pss;
751 acpi_string *str;
752 acpi_status status;
753
754 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
755 &buffer);
756 if (ACPI_FAILURE(status)) {
757 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
758 return -ENODEV;
759 }
760
761 pss = buffer.pointer;
762 if (!pss ||
763 pss->type != ACPI_TYPE_PACKAGE ||
764 pss->package.count != 14) {
765 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
766 "Invalid _PMC data\n");
767 res = -EFAULT;
768 goto end;
769 }
770
771 /* Grab all the integer data at once */
772 state.length = sizeof(struct acpi_power_meter_capabilities);
773 state.pointer = &resource->caps;
774
775 status = acpi_extract_package(pss, &format, &state);
776 if (ACPI_FAILURE(status)) {
777 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
778 res = -EFAULT;
779 goto end;
780 }
781
782 if (resource->caps.units) {
783 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
784 "Unknown units %llu.\n",
785 resource->caps.units);
786 res = -EINVAL;
787 goto end;
788 }
789
790 /* Grab the string data */
791 str = &resource->model_number;
792
793 for (i = 11; i < 14; i++) {
794 union acpi_object *element = &(pss->package.elements[i]);
795
796 if (element->type != ACPI_TYPE_STRING) {
797 res = -EINVAL;
798 goto error;
799 }
800
801 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
802 GFP_KERNEL);
803 if (!*str) {
804 res = -ENOMEM;
805 goto error;
806 }
807
808 strncpy(*str, element->string.pointer, element->string.length);
809 str++;
810 }
811
812 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
813 goto end;
814error:
815 str = &resource->model_number;
816 for (i = 0; i < 3; i++, str++)
817 kfree(*str);
818end:
819 kfree(buffer.pointer);
820 return res;
821}
822
823/* Handle ACPI event notifications */
824static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
825{
826 struct acpi_power_meter_resource *resource;
827 int res;
828
829 if (!device || !acpi_driver_data(device))
830 return;
831
832 resource = acpi_driver_data(device);
833
834 mutex_lock(&resource->lock);
835 switch (event) {
836 case METER_NOTIFY_CONFIG:
837 free_capabilities(resource);
838 res = read_capabilities(resource);
839 if (res)
840 break;
841
842 remove_attrs(resource);
843 setup_attrs(resource);
844 break;
845 case METER_NOTIFY_TRIP:
846 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
847 update_meter(resource);
848 break;
849 case METER_NOTIFY_CAP:
850 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
851 update_cap(resource);
852 break;
853 case METER_NOTIFY_INTERVAL:
854 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
855 update_avg_interval(resource);
856 break;
857 case METER_NOTIFY_CAPPING:
858 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
859 dev_info(&device->dev, "Capping in progress.\n");
860 break;
861 default:
83c97fe1
GR		 862 WARN(1, "Unexpected event %d\n", event);
863 break;
de584afa
DW		 864 }
865 mutex_unlock(&resource->lock);
866
867 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
868 dev_name(&device->dev), event, 0);
869}
870
871static int acpi_power_meter_add(struct acpi_device *device)
872{
873 int res;
874 struct acpi_power_meter_resource *resource;
875
876 if (!device)
877 return -EINVAL;
878
879 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
880 GFP_KERNEL);
881 if (!resource)
882 return -ENOMEM;
883
884 resource->sensors_valid = 0;
885 resource->acpi_dev = device;
886 mutex_init(&resource->lock);
887 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
888 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
889 device->driver_data = resource;
890
891 free_capabilities(resource);
892 res = read_capabilities(resource);
893 if (res)
894 goto exit_free;
895
896 resource->trip[0] = resource->trip[1] = -1;
897
898 res = setup_attrs(resource);
899 if (res)
900 goto exit_free;
901
902 resource->hwmon_dev = hwmon_device_register(&device->dev);
903 if (IS_ERR(resource->hwmon_dev)) {
904 res = PTR_ERR(resource->hwmon_dev);
905 goto exit_remove;
906 }
907
908 res = 0;
909 goto exit;
910
911exit_remove:
912 remove_attrs(resource);
913exit_free:
914 kfree(resource);
915exit:
916 return res;
917}
918
51fac838 919static int acpi_power_meter_remove(struct acpi_device *device)
de584afa
DW		 920{
921 struct acpi_power_meter_resource *resource;
922
923 if (!device || !acpi_driver_data(device))
924 return -EINVAL;
925
926 resource = acpi_driver_data(device);
927 hwmon_device_unregister(resource->hwmon_dev);
928
929 free_capabilities(resource);
930 remove_attrs(resource);
931
932 kfree(resource);
933 return 0;
934}
935
9baeb8fd
GR		 936#ifdef CONFIG_PM_SLEEP
937
c5dec018 938static int acpi_power_meter_resume(struct device *dev)
de584afa
DW		 939{
940 struct acpi_power_meter_resource *resource;
941
c5dec018
RW		 942 if (!dev)
943 return -EINVAL;
944
945 resource = acpi_driver_data(to_acpi_device(dev));
946 if (!resource)
de584afa
DW		 947 return -EINVAL;
948
de584afa
DW		 949 free_capabilities(resource);
950 read_capabilities(resource);
951
952 return 0;
953}
954
9baeb8fd
GR		 955#endif /* CONFIG_PM_SLEEP */
956
c5dec018
RW		 957static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
958
de584afa
DW		 959static struct acpi_driver acpi_power_meter_driver = {
960 .name = "power_meter",
961 .class = ACPI_POWER_METER_CLASS,
962 .ids = power_meter_ids,
963 .ops = {
964 .add = acpi_power_meter_add,
965 .remove = acpi_power_meter_remove,
de584afa
DW		 966 .notify = acpi_power_meter_notify,
967 },
c5dec018 968 .drv.pm = &acpi_power_meter_pm,
de584afa
DW		 969};
970
971/* Module init/exit routines */
972static int __init enable_cap_knobs(const struct dmi_system_id *d)
973{
974 cap_in_hardware = 1;
975 return 0;
976}
977
978static struct dmi_system_id __initdata pm_dmi_table[] = {
979 {
980 enable_cap_knobs, "IBM Active Energy Manager",
981 {
982 DMI_MATCH(DMI_SYS_VENDOR, "IBM")
983 },
984 },
985 {}
986};
987
988static int __init acpi_power_meter_init(void)
989{
990 int result;
991
992 if (acpi_disabled)
993 return -ENODEV;
994
995 dmi_check_system(pm_dmi_table);
996
997 result = acpi_bus_register_driver(&acpi_power_meter_driver);
998 if (result < 0)
19f053c8 999 return result;
de584afa
DW		 1000
1001 return 0;
1002}
1003
1004static void __exit acpi_power_meter_exit(void)
1005{
1006 acpi_bus_unregister_driver(&acpi_power_meter_driver);
1007}
1008
5407e051 1009MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
de584afa
DW		 1010MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
1011MODULE_LICENSE("GPL");
1012
1013module_param(force_cap_on, bool, 0644);
1014MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1015
1016module_init(acpi_power_meter_init);
1017module_exit(acpi_power_meter_exit);
Linux kernel - Deliverables
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