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acpi_power_meter: remove duplicate code between register_{ro,rw}_attrs
[mirror_ubuntu-artful-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;
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! */
81194cd2 480static struct sensor_template meter_ro_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),
81194cd2 486 {},
de584afa
DW		 487};
488
81194cd2 489static struct sensor_template meter_rw_attrs[] = {
3c45f2c7
KM		 490 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval,
491 set_avg_interval, 0),
81194cd2 492 {},
de584afa
DW		 493};
494
81194cd2 495static struct sensor_template misc_cap_attrs[] = {
3c45f2c7
KM		 496 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2),
497 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3),
498 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4),
499 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6),
81194cd2 500 {},
de584afa
DW		 501};
502
81194cd2 503static struct sensor_template ro_cap_attrs[] = {
3c45f2c7 504 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0),
81194cd2 505 {},
de584afa
DW		 506};
507
81194cd2 508static struct sensor_template rw_cap_attrs[] = {
3c45f2c7 509 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0),
81194cd2 510 {},
de584afa
DW		 511};
512
81194cd2 513static struct sensor_template trip_attrs[] = {
3c45f2c7
KM		 514 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7),
515 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8),
81194cd2 516 {},
de584afa
DW		 517};
518
81194cd2 519static struct sensor_template misc_attrs[] = {
3c45f2c7
KM		 520 RO_SENSOR_TEMPLATE("name", show_name, 0),
521 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0),
522 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2),
523 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1),
81194cd2 524 {},
de584afa
DW		 525};
526
3c45f2c7
KM		 527#undef RO_SENSOR_TEMPLATE
528#undef RW_SENSOR_TEMPLATE
529
de584afa
DW		 530/* Read power domain data */
531static void remove_domain_devices(struct acpi_power_meter_resource *resource)
532{
533 int i;
534
535 if (!resource->num_domain_devices)
536 return;
537
538 for (i = 0; i < resource->num_domain_devices; i++) {
539 struct acpi_device *obj = resource->domain_devices[i];
540 if (!obj)
541 continue;
542
543 sysfs_remove_link(resource->holders_dir,
544 kobject_name(&obj->dev.kobj));
545 put_device(&obj->dev);
546 }
547
548 kfree(resource->domain_devices);
549 kobject_put(resource->holders_dir);
7f07a605 550 resource->num_domain_devices = 0;
de584afa
DW		 551}
552
553static int read_domain_devices(struct acpi_power_meter_resource *resource)
554{
555 int res = 0;
556 int i;
557 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
558 union acpi_object *pss;
559 acpi_status status;
560
561 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL,
562 &buffer);
563 if (ACPI_FAILURE(status)) {
564 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD"));
565 return -ENODEV;
566 }
567
568 pss = buffer.pointer;
569 if (!pss ||
570 pss->type != ACPI_TYPE_PACKAGE) {
571 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
572 "Invalid _PMD data\n");
573 res = -EFAULT;
574 goto end;
575 }
576
577 if (!pss->package.count)
578 goto end;
579
580 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) *
581 pss->package.count, GFP_KERNEL);
582 if (!resource->domain_devices) {
583 res = -ENOMEM;
584 goto end;
585 }
586
587 resource->holders_dir = kobject_create_and_add("measures",
588 &resource->acpi_dev->dev.kobj);
589 if (!resource->holders_dir) {
590 res = -ENOMEM;
591 goto exit_free;
592 }
593
594 resource->num_domain_devices = pss->package.count;
595
596 for (i = 0; i < pss->package.count; i++) {
597 struct acpi_device *obj;
598 union acpi_object *element = &(pss->package.elements[i]);
599
600 /* Refuse non-references */
601 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
602 continue;
603
604 /* Create a symlink to domain objects */
605 resource->domain_devices[i] = NULL;
606 status = acpi_bus_get_device(element->reference.handle,
607 &resource->domain_devices[i]);
608 if (ACPI_FAILURE(status))
609 continue;
610
611 obj = resource->domain_devices[i];
612 get_device(&obj->dev);
613
614 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj,
615 kobject_name(&obj->dev.kobj));
616 if (res) {
617 put_device(&obj->dev);
618 resource->domain_devices[i] = NULL;
619 }
620 }
621
622 res = 0;
623 goto end;
624
625exit_free:
626 kfree(resource->domain_devices);
627end:
628 kfree(buffer.pointer);
629 return res;
630}
631
632/* Registration and deregistration */
f49d6a7e
KM		 633static int register_attrs(struct acpi_power_meter_resource *resource,
634 struct sensor_template *attrs)
de584afa
DW		 635{
636 struct device *dev = &resource->acpi_dev->dev;
637 struct sensor_device_attribute *sensors =
638 &resource->sensors[resource->num_sensors];
639 int res = 0;
640
f49d6a7e
KM		 641 while (attrs->label) {
642 sensors->dev_attr.attr.name = attrs->label;
de584afa 643 sensors->dev_attr.attr.mode = S_IRUGO;
f49d6a7e
KM		 644 sensors->dev_attr.show = attrs->show;
645 sensors->index = attrs->index;
de584afa 646
f49d6a7e
KM		 647 if (attrs->set) {
648 sensors->dev_attr.attr.mode |= S_IWUSR;
649 sensors->dev_attr.store = attrs->set;
de584afa 650 }
de584afa 651
31e354ee 652 sysfs_attr_init(&sensors->dev_attr.attr);
de584afa
DW		 653 res = device_create_file(dev, &sensors->dev_attr);
654 if (res) {
655 sensors->dev_attr.attr.name = NULL;
656 goto error;
657 }
658 sensors++;
659 resource->num_sensors++;
f49d6a7e 660 attrs++;
de584afa
DW		 661 }
662
663error:
664 return res;
665}
666
667static void remove_attrs(struct acpi_power_meter_resource *resource)
668{
669 int i;
670
671 for (i = 0; i < resource->num_sensors; i++) {
672 if (!resource->sensors[i].dev_attr.attr.name)
673 continue;
674 device_remove_file(&resource->acpi_dev->dev,
675 &resource->sensors[i].dev_attr);
676 }
677
678 remove_domain_devices(resource);
679
680 resource->num_sensors = 0;
681}
682
683static int setup_attrs(struct acpi_power_meter_resource *resource)
684{
685 int res = 0;
686
687 res = read_domain_devices(resource);
688 if (res)
689 return res;
690
691 if (resource->caps.flags & POWER_METER_CAN_MEASURE) {
f49d6a7e 692 res = register_attrs(resource, meter_ro_attrs);
de584afa
DW		 693 if (res)
694 goto error;
f49d6a7e 695 res = register_attrs(resource, meter_rw_attrs);
de584afa
DW		 696 if (res)
697 goto error;
698 }
699
700 if (resource->caps.flags & POWER_METER_CAN_CAP) {
701 if (!can_cap_in_hardware()) {
702 dev_err(&resource->acpi_dev->dev,
703 "Ignoring unsafe software power cap!\n");
704 goto skip_unsafe_cap;
705 }
706
707 if (resource->caps.configurable_cap) {
f49d6a7e 708 res = register_attrs(resource, rw_cap_attrs);
de584afa
DW		 709 if (res)
710 goto error;
711 } else {
f49d6a7e 712 res = register_attrs(resource, ro_cap_attrs);
de584afa
DW		 713 if (res)
714 goto error;
715 }
f49d6a7e 716 res = register_attrs(resource, misc_cap_attrs);
de584afa
DW		 717 if (res)
718 goto error;
719 }
720skip_unsafe_cap:
721
722 if (resource->caps.flags & POWER_METER_CAN_TRIP) {
f49d6a7e 723 res = register_attrs(resource, trip_attrs);
de584afa
DW		 724 if (res)
725 goto error;
726 }
727
f49d6a7e 728 res = register_attrs(resource, misc_attrs);
de584afa
DW		 729 if (res)
730 goto error;
731
732 return res;
733error:
de584afa
DW		 734 remove_attrs(resource);
735 return res;
736}
737
738static void free_capabilities(struct acpi_power_meter_resource *resource)
739{
740 acpi_string *str;
741 int i;
742
743 str = &resource->model_number;
744 for (i = 0; i < 3; i++, str++)
745 kfree(*str);
746}
747
748static int read_capabilities(struct acpi_power_meter_resource *resource)
749{
750 int res = 0;
751 int i;
752 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
753 struct acpi_buffer state = { 0, NULL };
754 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" };
755 union acpi_object *pss;
756 acpi_string *str;
757 acpi_status status;
758
759 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL,
760 &buffer);
761 if (ACPI_FAILURE(status)) {
762 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC"));
763 return -ENODEV;
764 }
765
766 pss = buffer.pointer;
767 if (!pss ||
768 pss->type != ACPI_TYPE_PACKAGE ||
769 pss->package.count != 14) {
770 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
771 "Invalid _PMC data\n");
772 res = -EFAULT;
773 goto end;
774 }
775
776 /* Grab all the integer data at once */
777 state.length = sizeof(struct acpi_power_meter_capabilities);
778 state.pointer = &resource->caps;
779
780 status = acpi_extract_package(pss, &format, &state);
781 if (ACPI_FAILURE(status)) {
782 ACPI_EXCEPTION((AE_INFO, status, "Invalid data"));
783 res = -EFAULT;
784 goto end;
785 }
786
787 if (resource->caps.units) {
788 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME
789 "Unknown units %llu.\n",
790 resource->caps.units);
791 res = -EINVAL;
792 goto end;
793 }
794
795 /* Grab the string data */
796 str = &resource->model_number;
797
798 for (i = 11; i < 14; i++) {
799 union acpi_object *element = &(pss->package.elements[i]);
800
801 if (element->type != ACPI_TYPE_STRING) {
802 res = -EINVAL;
803 goto error;
804 }
805
806 *str = kzalloc(sizeof(u8) * (element->string.length + 1),
807 GFP_KERNEL);
808 if (!*str) {
809 res = -ENOMEM;
810 goto error;
811 }
812
813 strncpy(*str, element->string.pointer, element->string.length);
814 str++;
815 }
816
817 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n");
818 goto end;
819error:
820 str = &resource->model_number;
821 for (i = 0; i < 3; i++, str++)
822 kfree(*str);
823end:
824 kfree(buffer.pointer);
825 return res;
826}
827
828/* Handle ACPI event notifications */
829static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
830{
831 struct acpi_power_meter_resource *resource;
832 int res;
833
834 if (!device || !acpi_driver_data(device))
835 return;
836
837 resource = acpi_driver_data(device);
838
839 mutex_lock(&resource->lock);
840 switch (event) {
841 case METER_NOTIFY_CONFIG:
842 free_capabilities(resource);
843 res = read_capabilities(resource);
844 if (res)
845 break;
846
847 remove_attrs(resource);
848 setup_attrs(resource);
849 break;
850 case METER_NOTIFY_TRIP:
851 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
852 update_meter(resource);
853 break;
854 case METER_NOTIFY_CAP:
855 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME);
856 update_cap(resource);
857 break;
858 case METER_NOTIFY_INTERVAL:
859 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME);
860 update_avg_interval(resource);
861 break;
862 case METER_NOTIFY_CAPPING:
863 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME);
864 dev_info(&device->dev, "Capping in progress.\n");
865 break;
866 default:
867 BUG();
868 }
869 mutex_unlock(&resource->lock);
870
871 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS,
872 dev_name(&device->dev), event, 0);
873}
874
875static int acpi_power_meter_add(struct acpi_device *device)
876{
877 int res;
878 struct acpi_power_meter_resource *resource;
879
880 if (!device)
881 return -EINVAL;
882
883 resource = kzalloc(sizeof(struct acpi_power_meter_resource),
884 GFP_KERNEL);
885 if (!resource)
886 return -ENOMEM;
887
888 resource->sensors_valid = 0;
889 resource->acpi_dev = device;
890 mutex_init(&resource->lock);
891 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME);
892 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS);
893 device->driver_data = resource;
894
895 free_capabilities(resource);
896 res = read_capabilities(resource);
897 if (res)
898 goto exit_free;
899
900 resource->trip[0] = resource->trip[1] = -1;
901
902 res = setup_attrs(resource);
903 if (res)
904 goto exit_free;
905
906 resource->hwmon_dev = hwmon_device_register(&device->dev);
907 if (IS_ERR(resource->hwmon_dev)) {
908 res = PTR_ERR(resource->hwmon_dev);
909 goto exit_remove;
910 }
911
912 res = 0;
913 goto exit;
914
915exit_remove:
916 remove_attrs(resource);
917exit_free:
918 kfree(resource);
919exit:
920 return res;
921}
922
923static int acpi_power_meter_remove(struct acpi_device *device, int type)
924{
925 struct acpi_power_meter_resource *resource;
926
927 if (!device || !acpi_driver_data(device))
928 return -EINVAL;
929
930 resource = acpi_driver_data(device);
931 hwmon_device_unregister(resource->hwmon_dev);
932
933 free_capabilities(resource);
934 remove_attrs(resource);
935
936 kfree(resource);
937 return 0;
938}
939
940static int acpi_power_meter_resume(struct acpi_device *device)
941{
942 struct acpi_power_meter_resource *resource;
943
944 if (!device || !acpi_driver_data(device))
945 return -EINVAL;
946
947 resource = acpi_driver_data(device);
948 free_capabilities(resource);
949 read_capabilities(resource);
950
951 return 0;
952}
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 .resume = acpi_power_meter_resume,
962 .notify = acpi_power_meter_notify,
963 },
964};
965
966/* Module init/exit routines */
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);
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