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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>
28#include <linux/slab.h>
29#include <linux/kdev_t.h>
30#include <linux/sched.h>
31#include <linux/time.h>
32#include <linux/err.h>
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"
39#define ACPI_POWER_METER_CLASS "pwr_meter_resource"
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;
62static bool force_cap_on;
63
64static int can_cap_in_hardware(void)
65{
66 return force_cap_on || cap_in_hardware;
67}
68
69static const struct acpi_device_id power_meter_ids[] = {
70 {"ACPI000D", 0},
71 {"", 0},
72};
73MODULE_DEVICE_TABLE(acpi, power_meter_ids);
74
75struct acpi_power_meter_capabilities {
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;
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;
98 u64 power;
99 u64 cap;
100 u64 avg_interval;
101 int sensors_valid;
102 unsigned long sensors_last_updated;
103 struct sensor_device_attribute sensors[NUM_SENSORS];
104 int num_sensors;
105 s64 trip[2];
106 int num_domain_devices;
107 struct acpi_device **domain_devices;
108 struct kobject *holders_dir;
109};
110
111struct sensor_template {
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
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
166 res = kstrtoul(buf, 10, &temp);
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
188 if (data)
189 return -EINVAL;
190
191 return count;
192}
193
194
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
237 res = kstrtoul(buf, 10, &temp);
238 if (res)
239 return res;
240
241 temp = DIV_ROUND_CLOSEST(temp, 1000);
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
259 if (data)
260 return -EINVAL;
261
262 return count;
263}
264
265
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
277 if (resource->trip[0] < 0 || resource->trip[1] < 0)
278 return 0;
279
280
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
291
292 if (data)
293 return -EINVAL;
294
295 return 0;
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
307 res = kstrtoul(buf, 10, &temp);
308 if (res)
309 return res;
310
311 temp = DIV_ROUND_CLOSEST(temp, 1000);
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
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
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:
384 BUG();
385 val = "";
386 }
387
388 return sprintf(buf, "%s\n", val);
389}
390
391static ssize_t show_val(struct device *dev,
392 struct device_attribute *devattr,
393 char *buf)
394{
395 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
396 struct acpi_device *acpi_dev = to_acpi_device(dev);
397 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
398 u64 val = 0;
399
400 switch (attr->index) {
401 case 0:
402 val = resource->caps.min_avg_interval;
403 break;
404 case 1:
405 val = resource->caps.max_avg_interval;
406 break;
407 case 2:
408 val = resource->caps.min_cap * 1000;
409 break;
410 case 3:
411 val = resource->caps.max_cap * 1000;
412 break;
413 case 4:
414 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS)
415 return sprintf(buf, "unknown\n");
416
417 val = resource->caps.hysteresis * 1000;
418 break;
419 case 5:
420 if (resource->caps.flags & POWER_METER_IS_BATTERY)
421 val = 1;
422 else
423 val = 0;
424 break;
425 case 6:
426 if (resource->power > resource->cap)
427 val = 1;
428 else
429 val = 0;
430 break;
431 case 7:
432 case 8:
433 if (resource->trip[attr->index - 7] < 0)
434 return sprintf(buf, "unknown\n");
435
436 val = resource->trip[attr->index - 7] * 1000;
437 break;
438 default:
439 BUG();
440 }
441
442 return sprintf(buf, "%llu\n", val);
443}
444
445static ssize_t show_accuracy(struct device *dev,
446 struct device_attribute *devattr,
447 char *buf)
448{
449 struct acpi_device *acpi_dev = to_acpi_device(dev);
450 struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
451 unsigned int acc = resource->caps.accuracy;
452
453 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000);
454}
455
456static ssize_t show_name(struct device *dev,
457 struct device_attribute *devattr,
458 char *buf)
459{
460 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME);
461}
462
463#define RO_SENSOR_TEMPLATE(_label, _show, _index) \
464 { \
465 .label = _label, \
466 .show = _show, \
467 .index = _index, \
468 }
469
470#define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \
471 { \
472 .label = _label, \
473 .show = _show, \
474 .set = _set, \
475 .index = _index, \
476 }
477
478
479static struct sensor_template meter_attrs[] = {
480 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0),
481 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0),
482 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0),
483 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1),
484 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5),
485 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
486 set_avg_interval, 0),
487 {},
488};
489
490static struct sensor_template misc_cap_attrs[] = {
491 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
492 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
493 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
494 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
495 {},
496};
497
498static struct sensor_template ro_cap_attrs[] = {
499 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
500 {},
501};
502
503static struct sensor_template rw_cap_attrs[] = {
504 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
505 {},
506};
507
508static struct sensor_template trip_attrs[] = {
509 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
510 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
511 {},
512};
513
514static struct sensor_template misc_attrs[] = {
515 RO_SENSOR_TEMPLATE("name", show_name, 0),
516 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
517 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
518 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
519 {},
520};
521
522#undef RO_SENSOR_TEMPLATE
523#undef RW_SENSOR_TEMPLATE
524
525
526static void remove_domain_devices(struct acpi_power_meter_resource *resource)
527{
528 int i;
529
530 if (!resource->num_domain_devices)
531 return;
532
533 for (i = 0; i < resource->num_domain_devices; i++) {
534 struct acpi_device *obj = resource->domain_devices[i];
535 if (!obj)
536 continue;
537
538 sysfs_remove_link(resource->holders_dir,
539 kobject_name(&obj->dev.kobj));
540 put_device(&obj->dev);
541 }
542
543 kfree(resource->domain_devices);
544 kobject_put(resource->holders_dir);
545 resource->num_domain_devices = 0;
546}
547
548static int read_domain_devices(struct acpi_power_meter_resource *resource)
549{
550 int res = 0;
551 int i;
552 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
553 union acpi_object *pss;
554 acpi_status status;
555
556 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
557 &buffer);
558 if (ACPI_FAILURE(status)) {
559 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
560 return -ENODEV;
561 }
562
563 pss = buffer.pointer;
564 if (!pss ||
565 pss->type != ACPI_TYPE_PACKAGE) {
566 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
567 "Invalid _PMD data\n");
568 res = -EFAULT;
569 goto end;
570 }
571
572 if (!pss->package.count)
573 goto end;
574
575 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
576 pss->package.count, GFP_KERNEL);
577 if (!resource->domain_devices) {
578 res = -ENOMEM;
579 goto end;
580 }
581
582 resource->holders_dir = kobject_create_and_add("measures",
583 &resource->acpi_dev->dev.kobj);
584 if (!resource->holders_dir) {
585 res = -ENOMEM;
586 goto exit_free;
587 }
588
589 resource->num_domain_devices = pss->package.count;
590
591 for (i = 0; i < pss->package.count; i++) {
592 struct acpi_device *obj;
593 union acpi_object *element = &(pss->package.elements[i]);
594
595
596 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
597 continue;
598
599
600 resource->domain_devices[i] = NULL;
601 status = acpi_bus_get_device(element->reference.handle,
602 &resource->domain_devices[i]);
603 if (ACPI_FAILURE(status))
604 continue;
605
606 obj = resource->domain_devices[i];
607 get_device(&obj->dev);
608
609 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
610 kobject_name(&obj->dev.kobj));
611 if (res) {
612 put_device(&obj->dev);
613 resource->domain_devices[i] = NULL;
614 }
615 }
616
617 res = 0;
618 goto end;
619
620exit_free:
621 kfree(resource->domain_devices);
622end:
623 kfree(buffer.pointer);
624 return res;
625}
626
627
628static int register_attrs(struct acpi_power_meter_resource *resource,
629 struct sensor_template *attrs)
630{
631 struct device *dev = &resource->acpi_dev->dev;
632 struct sensor_device_attribute *sensors =
633 &resource->sensors[resource->num_sensors];
634 int res = 0;
635
636 while (attrs->label) {
637 sensors->dev_attr.attr.name = attrs->label;
638 sensors->dev_attr.attr.mode = S_IRUGO;
639 sensors->dev_attr.show = attrs->show;
640 sensors->index = attrs->index;
641
642 if (attrs->set) {
643 sensors->dev_attr.attr.mode |= S_IWUSR;
644 sensors->dev_attr.store = attrs->set;
645 }
646
647 sysfs_attr_init(&sensors->dev_attr.attr);
648 res = device_create_file(dev, &sensors->dev_attr);
649 if (res) {
650 sensors->dev_attr.attr.name = NULL;
651 goto error;
652 }
653 sensors++;
654 resource->num_sensors++;
655 attrs++;
656 }
657
658error:
659 return res;
660}
661
662static void remove_attrs(struct acpi_power_meter_resource *resource)
663{
664 int i;
665
666 for (i = 0; i < resource->num_sensors; i++) {
667 if (!resource->sensors[i].dev_attr.attr.name)
668 continue;
669 device_remove_file(&resource->acpi_dev->dev,
670 &resource->sensors[i].dev_attr);
671 }
672
673 remove_domain_devices(resource);
674
675 resource->num_sensors = 0;
676}
677
678static int setup_attrs(struct acpi_power_meter_resource *resource)
679{
680 int res = 0;
681
682 res = read_domain_devices(resource);
683 if (res)
684 return res;
685
686 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
687 res = register_attrs(resource, meter_attrs);
688 if (res)
689 goto error;
690 }
691
692 if (resource->caps.flags & POWER_METER_CAN_CAP) {
693 if (!can_cap_in_hardware()) {
694 dev_err(&resource->acpi_dev->dev,
695 "Ignoring unsafe software power cap!\n");
696 goto skip_unsafe_cap;
697 }
698
699 if (resource->caps.configurable_cap)
700 res = register_attrs(resource, rw_cap_attrs);
701 else
702 res = register_attrs(resource, ro_cap_attrs);
703
704 if (res)
705 goto error;
706
707 res = register_attrs(resource, misc_cap_attrs);
708 if (res)
709 goto error;
710 }
711
712skip_unsafe_cap:
713 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
714 res = register_attrs(resource, trip_attrs);
715 if (res)
716 goto error;
717 }
718
719 res = register_attrs(resource, misc_attrs);
720 if (res)
721 goto error;
722
723 return res;
724error:
725 remove_attrs(resource);
726 return res;
727}
728
729static void free_capabilities(struct acpi_power_meter_resource *resource)
730{
731 acpi_string *str;
732 int i;
733
734 str = &resource->model_number;
735 for (i = 0; i < 3; i++, str++)
736 kfree(*str);
737}
738
739static int read_capabilities(struct acpi_power_meter_resource *resource)
740{
741 int res = 0;
742 int i;
743 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
744 struct acpi_buffer state = { 0, NULL };
745 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
746 union acpi_object *pss;
747 acpi_string *str;
748 acpi_status status;
749
750 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
751 &buffer);
752 if (ACPI_FAILURE(status)) {
753 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
754 return -ENODEV;
755 }
756
757 pss = buffer.pointer;
758 if (!pss ||
759 pss->type != ACPI_TYPE_PACKAGE ||
760 pss->package.count != 14) {
761 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
762 "Invalid _PMC data\n");
763 res = -EFAULT;
764 goto end;
765 }
766
767
768 state.length = sizeof(struct acpi_power_meter_capabilities);
769 state.pointer = &resource->caps;
770
771 status = acpi_extract_package(pss, &format, &state);
772 if (ACPI_FAILURE(status)) {
773 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
774 res = -EFAULT;
775 goto end;
776 }
777
778 if (resource->caps.units) {
779 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
780 "Unknown units %llu.\n",
781 resource->caps.units);
782 res = -EINVAL;
783 goto end;
784 }
785
786
787 str = &resource->model_number;
788
789 for (i = 11; i < 14; i++) {
790 union acpi_object *element = &(pss->package.elements[i]);
791
792 if (element->type != ACPI_TYPE_STRING) {
793 res = -EINVAL;
794 goto error;
795 }
796
797 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
798 GFP_KERNEL);
799 if (!*str) {
800 res = -ENOMEM;
801 goto error;
802 }
803
804 strncpy(*str, element->string.pointer, element->string.length);
805 str++;
806 }
807
808 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
809 goto end;
810error:
811 str = &resource->model_number;
812 for (i = 0; i < 3; i++, str++)
813 kfree(*str);
814end:
815 kfree(buffer.pointer);
816 return res;
817}
818
819
820static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
821{
822 struct acpi_power_meter_resource *resource;
823 int res;
824
825 if (!device || !acpi_driver_data(device))
826 return;
827
828 resource = acpi_driver_data(device);
829
830 mutex_lock(&resource->lock);
831 switch (event) {
832 case METER_NOTIFY_CONFIG:
833 free_capabilities(resource);
834 res = read_capabilities(resource);
835 if (res)
836 break;
837
838 remove_attrs(resource);
839 setup_attrs(resource);
840 break;
841 case METER_NOTIFY_TRIP:
842 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
843 update_meter(resource);
844 break;
845 case METER_NOTIFY_CAP:
846 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
847 update_cap(resource);
848 break;
849 case METER_NOTIFY_INTERVAL:
850 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
851 update_avg_interval(resource);
852 break;
853 case METER_NOTIFY_CAPPING:
854 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
855 dev_info(&device->dev, "Capping in progress.\n");
856 break;
857 default:
858 BUG();
859 }
860 mutex_unlock(&resource->lock);
861
862 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
863 dev_name(&device->dev), event, 0);
864}
865
866static int acpi_power_meter_add(struct acpi_device *device)
867{
868 int res;
869 struct acpi_power_meter_resource *resource;
870
871 if (!device)
872 return -EINVAL;
873
874 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
875 GFP_KERNEL);
876 if (!resource)
877 return -ENOMEM;
878
879 resource->sensors_valid = 0;
880 resource->acpi_dev = device;
881 mutex_init(&resource->lock);
882 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
883 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
884 device->driver_data = resource;
885
886 free_capabilities(resource);
887 res = read_capabilities(resource);
888 if (res)
889 goto exit_free;
890
891 resource->trip[0] = resource->trip[1] = -1;
892
893 res = setup_attrs(resource);
894 if (res)
895 goto exit_free;
896
897 resource->hwmon_dev = hwmon_device_register(&device->dev);
898 if (IS_ERR(resource->hwmon_dev)) {
899 res = PTR_ERR(resource->hwmon_dev);
900 goto exit_remove;
901 }
902
903 res = 0;
904 goto exit;
905
906exit_remove:
907 remove_attrs(resource);
908exit_free:
909 kfree(resource);
910exit:
911 return res;
912}
913
914static int acpi_power_meter_remove(struct acpi_device *device)
915{
916 struct acpi_power_meter_resource *resource;
917
918 if (!device || !acpi_driver_data(device))
919 return -EINVAL;
920
921 resource = acpi_driver_data(device);
922 hwmon_device_unregister(resource->hwmon_dev);
923
924 free_capabilities(resource);
925 remove_attrs(resource);
926
927 kfree(resource);
928 return 0;
929}
930
931#ifdef CONFIG_PM_SLEEP
932
933static int acpi_power_meter_resume(struct device *dev)
934{
935 struct acpi_power_meter_resource *resource;
936
937 if (!dev)
938 return -EINVAL;
939
940 resource = acpi_driver_data(to_acpi_device(dev));
941 if (!resource)
942 return -EINVAL;
943
944 free_capabilities(resource);
945 read_capabilities(resource);
946
947 return 0;
948}
949
950#endif
951
952static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume);
953
954static struct acpi_driver acpi_power_meter_driver = {
955 .name = "power_meter",
956 .class = ACPI_POWER_METER_CLASS,
957 .ids = power_meter_ids,
958 .ops = {
959 .add = acpi_power_meter_add,
960 .remove = acpi_power_meter_remove,
961 .notify = acpi_power_meter_notify,
962 },
963 .drv.pm = &acpi_power_meter_pm,
964};
965
966
967static int __init enable_cap_knobs(const struct dmi_system_id *d)
968{
969 cap_in_hardware = 1;
970 return 0;
971}
972
973static struct dmi_system_id __initdata pm_dmi_table[] = {
974 {
975 enable_cap_knobs, "IBM Active Energy Manager",
976 {
977 DMI_MATCH(DMI_SYS_VENDOR, "IBM")
978 },
979 },
980 {}
981};
982
983static int __init acpi_power_meter_init(void)
984{
985 int result;
986
987 if (acpi_disabled)
988 return -ENODEV;
989
990 dmi_check_system(pm_dmi_table);
991
992 result = acpi_bus_register_driver(&acpi_power_meter_driver);
993 if (result < 0)
994 return -ENODEV;
995
996 return 0;
997}
998
999static void __exit acpi_power_meter_exit(void)
1000{
1001 acpi_bus_unregister_driver(&acpi_power_meter_driver);
1002}
1003
1004MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>");
1005MODULE_DESCRIPTION("ACPI 4.0 power meter driver");
1006MODULE_LICENSE("GPL");
1007
1008module_param(force_cap_on, bool, 0644);
1009MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so.");
1010
1011module_init(acpi_power_meter_init);
1012module_exit(acpi_power_meter_exit);
1013
