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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" | |
36 | ACPI_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 | ||
60 | static int cap_in_hardware; | |
90ab5ee9 | 61 | static bool force_cap_on; |
de584afa DW |
62 | |
63 | static int can_cap_in_hardware(void) | |
64 | { | |
65 | return force_cap_on || cap_in_hardware; | |
66 | } | |
67 | ||
c97adf9e | 68 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
69 | {"ACPI000D", 0}, |
70 | {"", 0}, | |
71 | }; | |
72 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
73 | ||
74 | struct 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 | ||
88 | struct 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 | 110 | struct 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 */ | |
122 | static 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 | ||
138 | static 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 | ||
152 | static 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 */ | |
194 | static 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 | ||
210 | static 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 | ||
224 | static 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 */ | |
265 | static 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 | ||
297 | static 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 */ | |
326 | static 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 | ||
350 | static 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 */ | |
365 | static 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 | ||
392 | static 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 | ||
446 | static 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 | ||
457 | static 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 | ||
464 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ | |
81194cd2 KM |
465 | static struct sensor_template meter_ro_attrs[] = { |
466 | { | |
467 | .label = POWER_AVERAGE_NAME, | |
468 | .show = show_power, | |
469 | .index = 0, | |
470 | }, | |
471 | { | |
472 | .label = "power1_accuracy", | |
473 | .show = show_accuracy, | |
474 | .index = 0, | |
475 | }, | |
476 | { .label = "power1_average_interval_min", | |
477 | .show = show_val, | |
478 | .index = 0 | |
479 | }, | |
480 | { | |
481 | .label = "power1_average_interval_max", | |
482 | .show = show_val, | |
483 | .index = 1, | |
484 | }, | |
485 | { | |
486 | .label = "power1_is_battery", | |
487 | .show = show_val, | |
488 | .index = 5, | |
489 | }, | |
490 | {}, | |
de584afa DW |
491 | }; |
492 | ||
81194cd2 KM |
493 | static struct sensor_template meter_rw_attrs[] = { |
494 | { | |
495 | .label = POWER_AVG_INTERVAL_NAME, | |
496 | .show = show_avg_interval, | |
497 | .set = set_avg_interval, | |
498 | .index = 0, | |
499 | }, | |
500 | {}, | |
de584afa DW |
501 | }; |
502 | ||
81194cd2 KM |
503 | static struct sensor_template misc_cap_attrs[] = { |
504 | { | |
505 | .label = "power1_cap_min", | |
506 | .show = show_val, | |
507 | .index = 2, | |
508 | }, | |
509 | { | |
510 | .label = "power1_cap_max", | |
511 | .show = show_val, | |
512 | .index = 3, | |
513 | }, | |
514 | { | |
515 | .label = "power1_cap_hyst", | |
516 | .show = show_val, | |
517 | .index = 4, | |
518 | }, | |
519 | { | |
520 | .label = POWER_ALARM_NAME, | |
521 | .show = show_val, | |
522 | .index = 6, | |
523 | }, | |
524 | {}, | |
de584afa DW |
525 | }; |
526 | ||
81194cd2 KM |
527 | static struct sensor_template ro_cap_attrs[] = { |
528 | { | |
529 | .label = POWER_CAP_NAME, | |
530 | .show = show_cap, | |
531 | .index = 0, | |
532 | }, | |
533 | {}, | |
de584afa DW |
534 | }; |
535 | ||
81194cd2 KM |
536 | static struct sensor_template rw_cap_attrs[] = { |
537 | { | |
538 | .label = POWER_CAP_NAME, | |
539 | .show = show_cap, | |
540 | .set = set_cap, | |
541 | .index = 0, | |
542 | }, | |
543 | {}, | |
de584afa DW |
544 | }; |
545 | ||
81194cd2 KM |
546 | static struct sensor_template trip_attrs[] = { |
547 | { | |
548 | .label = "power1_average_min", | |
549 | .show = show_val, | |
550 | .set = set_trip, | |
551 | .index = 7, | |
552 | }, | |
553 | { | |
554 | .label = "power1_average_max", | |
555 | .show = show_val, | |
556 | .set = set_trip, | |
557 | .index = 8, | |
558 | }, | |
559 | {}, | |
de584afa DW |
560 | }; |
561 | ||
81194cd2 KM |
562 | static struct sensor_template misc_attrs[] = { |
563 | { | |
564 | .label = "name", | |
565 | .show = show_name, | |
566 | .index = 0, | |
567 | }, | |
568 | { | |
569 | .label = "power1_model_number", | |
570 | .show = show_str, | |
571 | .index = 0, | |
572 | }, | |
573 | { | |
574 | .label = "power1_oem_info", | |
575 | .show = show_str, | |
576 | .index = 2, | |
577 | }, | |
578 | { | |
579 | .label = "power1_serial_number", | |
580 | .show = show_str, | |
581 | .index = 1, | |
582 | }, | |
583 | {}, | |
de584afa DW |
584 | }; |
585 | ||
586 | /* Read power domain data */ | |
587 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
588 | { | |
589 | int i; | |
590 | ||
591 | if (!resource->num_domain_devices) | |
592 | return; | |
593 | ||
594 | for (i = 0; i < resource->num_domain_devices; i++) { | |
595 | struct acpi_device *obj = resource->domain_devices[i]; | |
596 | if (!obj) | |
597 | continue; | |
598 | ||
599 | sysfs_remove_link(resource->holders_dir, | |
600 | kobject_name(&obj->dev.kobj)); | |
601 | put_device(&obj->dev); | |
602 | } | |
603 | ||
604 | kfree(resource->domain_devices); | |
605 | kobject_put(resource->holders_dir); | |
7f07a605 | 606 | resource->num_domain_devices = 0; |
de584afa DW |
607 | } |
608 | ||
609 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
610 | { | |
611 | int res = 0; | |
612 | int i; | |
613 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
614 | union acpi_object *pss; | |
615 | acpi_status status; | |
616 | ||
617 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
618 | &buffer); | |
619 | if (ACPI_FAILURE(status)) { | |
620 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
621 | return -ENODEV; | |
622 | } | |
623 | ||
624 | pss = buffer.pointer; | |
625 | if (!pss || | |
626 | pss->type != ACPI_TYPE_PACKAGE) { | |
627 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
628 | "Invalid _PMD data\n"); | |
629 | res = -EFAULT; | |
630 | goto end; | |
631 | } | |
632 | ||
633 | if (!pss->package.count) | |
634 | goto end; | |
635 | ||
636 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
637 | pss->package.count, GFP_KERNEL); | |
638 | if (!resource->domain_devices) { | |
639 | res = -ENOMEM; | |
640 | goto end; | |
641 | } | |
642 | ||
643 | resource->holders_dir = kobject_create_and_add("measures", | |
644 | &resource->acpi_dev->dev.kobj); | |
645 | if (!resource->holders_dir) { | |
646 | res = -ENOMEM; | |
647 | goto exit_free; | |
648 | } | |
649 | ||
650 | resource->num_domain_devices = pss->package.count; | |
651 | ||
652 | for (i = 0; i < pss->package.count; i++) { | |
653 | struct acpi_device *obj; | |
654 | union acpi_object *element = &(pss->package.elements[i]); | |
655 | ||
656 | /* Refuse non-references */ | |
657 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
658 | continue; | |
659 | ||
660 | /* Create a symlink to domain objects */ | |
661 | resource->domain_devices[i] = NULL; | |
662 | status = acpi_bus_get_device(element->reference.handle, | |
663 | &resource->domain_devices[i]); | |
664 | if (ACPI_FAILURE(status)) | |
665 | continue; | |
666 | ||
667 | obj = resource->domain_devices[i]; | |
668 | get_device(&obj->dev); | |
669 | ||
670 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
671 | kobject_name(&obj->dev.kobj)); | |
672 | if (res) { | |
673 | put_device(&obj->dev); | |
674 | resource->domain_devices[i] = NULL; | |
675 | } | |
676 | } | |
677 | ||
678 | res = 0; | |
679 | goto end; | |
680 | ||
681 | exit_free: | |
682 | kfree(resource->domain_devices); | |
683 | end: | |
684 | kfree(buffer.pointer); | |
685 | return res; | |
686 | } | |
687 | ||
688 | /* Registration and deregistration */ | |
689 | static int register_ro_attrs(struct acpi_power_meter_resource *resource, | |
81194cd2 | 690 | struct sensor_template *ro) |
de584afa DW |
691 | { |
692 | struct device *dev = &resource->acpi_dev->dev; | |
693 | struct sensor_device_attribute *sensors = | |
694 | &resource->sensors[resource->num_sensors]; | |
695 | int res = 0; | |
696 | ||
697 | while (ro->label) { | |
698 | sensors->dev_attr.attr.name = ro->label; | |
699 | sensors->dev_attr.attr.mode = S_IRUGO; | |
700 | sensors->dev_attr.show = ro->show; | |
701 | sensors->index = ro->index; | |
702 | ||
31e354ee | 703 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
704 | res = device_create_file(dev, &sensors->dev_attr); |
705 | if (res) { | |
706 | sensors->dev_attr.attr.name = NULL; | |
707 | goto error; | |
708 | } | |
709 | sensors++; | |
710 | resource->num_sensors++; | |
711 | ro++; | |
712 | } | |
713 | ||
714 | error: | |
715 | return res; | |
716 | } | |
717 | ||
718 | static int register_rw_attrs(struct acpi_power_meter_resource *resource, | |
81194cd2 | 719 | struct sensor_template *rw) |
de584afa DW |
720 | { |
721 | struct device *dev = &resource->acpi_dev->dev; | |
722 | struct sensor_device_attribute *sensors = | |
723 | &resource->sensors[resource->num_sensors]; | |
724 | int res = 0; | |
725 | ||
726 | while (rw->label) { | |
727 | sensors->dev_attr.attr.name = rw->label; | |
728 | sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; | |
729 | sensors->dev_attr.show = rw->show; | |
730 | sensors->dev_attr.store = rw->set; | |
731 | sensors->index = rw->index; | |
732 | ||
31e354ee | 733 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
734 | res = device_create_file(dev, &sensors->dev_attr); |
735 | if (res) { | |
736 | sensors->dev_attr.attr.name = NULL; | |
737 | goto error; | |
738 | } | |
739 | sensors++; | |
740 | resource->num_sensors++; | |
741 | rw++; | |
742 | } | |
743 | ||
744 | error: | |
745 | return res; | |
746 | } | |
747 | ||
748 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
749 | { | |
750 | int i; | |
751 | ||
752 | for (i = 0; i < resource->num_sensors; i++) { | |
753 | if (!resource->sensors[i].dev_attr.attr.name) | |
754 | continue; | |
755 | device_remove_file(&resource->acpi_dev->dev, | |
756 | &resource->sensors[i].dev_attr); | |
757 | } | |
758 | ||
759 | remove_domain_devices(resource); | |
760 | ||
761 | resource->num_sensors = 0; | |
762 | } | |
763 | ||
764 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
765 | { | |
766 | int res = 0; | |
767 | ||
768 | res = read_domain_devices(resource); | |
769 | if (res) | |
770 | return res; | |
771 | ||
772 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
773 | res = register_ro_attrs(resource, meter_ro_attrs); | |
774 | if (res) | |
775 | goto error; | |
776 | res = register_rw_attrs(resource, meter_rw_attrs); | |
777 | if (res) | |
778 | goto error; | |
779 | } | |
780 | ||
781 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
782 | if (!can_cap_in_hardware()) { | |
783 | dev_err(&resource->acpi_dev->dev, | |
784 | "Ignoring unsafe software power cap!\n"); | |
785 | goto skip_unsafe_cap; | |
786 | } | |
787 | ||
788 | if (resource->caps.configurable_cap) { | |
789 | res = register_rw_attrs(resource, rw_cap_attrs); | |
790 | if (res) | |
791 | goto error; | |
792 | } else { | |
793 | res = register_ro_attrs(resource, ro_cap_attrs); | |
794 | if (res) | |
795 | goto error; | |
796 | } | |
797 | res = register_ro_attrs(resource, misc_cap_attrs); | |
798 | if (res) | |
799 | goto error; | |
800 | } | |
801 | skip_unsafe_cap: | |
802 | ||
803 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { | |
804 | res = register_rw_attrs(resource, trip_attrs); | |
805 | if (res) | |
806 | goto error; | |
807 | } | |
808 | ||
809 | res = register_ro_attrs(resource, misc_attrs); | |
810 | if (res) | |
811 | goto error; | |
812 | ||
813 | return res; | |
814 | error: | |
de584afa DW |
815 | remove_attrs(resource); |
816 | return res; | |
817 | } | |
818 | ||
819 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
820 | { | |
821 | acpi_string *str; | |
822 | int i; | |
823 | ||
824 | str = &resource->model_number; | |
825 | for (i = 0; i < 3; i++, str++) | |
826 | kfree(*str); | |
827 | } | |
828 | ||
829 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
830 | { | |
831 | int res = 0; | |
832 | int i; | |
833 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
834 | struct acpi_buffer state = { 0, NULL }; | |
835 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
836 | union acpi_object *pss; | |
837 | acpi_string *str; | |
838 | acpi_status status; | |
839 | ||
840 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
841 | &buffer); | |
842 | if (ACPI_FAILURE(status)) { | |
843 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
844 | return -ENODEV; | |
845 | } | |
846 | ||
847 | pss = buffer.pointer; | |
848 | if (!pss || | |
849 | pss->type != ACPI_TYPE_PACKAGE || | |
850 | pss->package.count != 14) { | |
851 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
852 | "Invalid _PMC data\n"); | |
853 | res = -EFAULT; | |
854 | goto end; | |
855 | } | |
856 | ||
857 | /* Grab all the integer data at once */ | |
858 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
859 | state.pointer = &resource->caps; | |
860 | ||
861 | status = acpi_extract_package(pss, &format, &state); | |
862 | if (ACPI_FAILURE(status)) { | |
863 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
864 | res = -EFAULT; | |
865 | goto end; | |
866 | } | |
867 | ||
868 | if (resource->caps.units) { | |
869 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
870 | "Unknown units %llu.\n", | |
871 | resource->caps.units); | |
872 | res = -EINVAL; | |
873 | goto end; | |
874 | } | |
875 | ||
876 | /* Grab the string data */ | |
877 | str = &resource->model_number; | |
878 | ||
879 | for (i = 11; i < 14; i++) { | |
880 | union acpi_object *element = &(pss->package.elements[i]); | |
881 | ||
882 | if (element->type != ACPI_TYPE_STRING) { | |
883 | res = -EINVAL; | |
884 | goto error; | |
885 | } | |
886 | ||
887 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
888 | GFP_KERNEL); | |
889 | if (!*str) { | |
890 | res = -ENOMEM; | |
891 | goto error; | |
892 | } | |
893 | ||
894 | strncpy(*str, element->string.pointer, element->string.length); | |
895 | str++; | |
896 | } | |
897 | ||
898 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
899 | goto end; | |
900 | error: | |
901 | str = &resource->model_number; | |
902 | for (i = 0; i < 3; i++, str++) | |
903 | kfree(*str); | |
904 | end: | |
905 | kfree(buffer.pointer); | |
906 | return res; | |
907 | } | |
908 | ||
909 | /* Handle ACPI event notifications */ | |
910 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
911 | { | |
912 | struct acpi_power_meter_resource *resource; | |
913 | int res; | |
914 | ||
915 | if (!device || !acpi_driver_data(device)) | |
916 | return; | |
917 | ||
918 | resource = acpi_driver_data(device); | |
919 | ||
920 | mutex_lock(&resource->lock); | |
921 | switch (event) { | |
922 | case METER_NOTIFY_CONFIG: | |
923 | free_capabilities(resource); | |
924 | res = read_capabilities(resource); | |
925 | if (res) | |
926 | break; | |
927 | ||
928 | remove_attrs(resource); | |
929 | setup_attrs(resource); | |
930 | break; | |
931 | case METER_NOTIFY_TRIP: | |
932 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
933 | update_meter(resource); | |
934 | break; | |
935 | case METER_NOTIFY_CAP: | |
936 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
937 | update_cap(resource); | |
938 | break; | |
939 | case METER_NOTIFY_INTERVAL: | |
940 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
941 | update_avg_interval(resource); | |
942 | break; | |
943 | case METER_NOTIFY_CAPPING: | |
944 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
945 | dev_info(&device->dev, "Capping in progress.\n"); | |
946 | break; | |
947 | default: | |
948 | BUG(); | |
949 | } | |
950 | mutex_unlock(&resource->lock); | |
951 | ||
952 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
953 | dev_name(&device->dev), event, 0); | |
954 | } | |
955 | ||
956 | static int acpi_power_meter_add(struct acpi_device *device) | |
957 | { | |
958 | int res; | |
959 | struct acpi_power_meter_resource *resource; | |
960 | ||
961 | if (!device) | |
962 | return -EINVAL; | |
963 | ||
964 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
965 | GFP_KERNEL); | |
966 | if (!resource) | |
967 | return -ENOMEM; | |
968 | ||
969 | resource->sensors_valid = 0; | |
970 | resource->acpi_dev = device; | |
971 | mutex_init(&resource->lock); | |
972 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
973 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
974 | device->driver_data = resource; | |
975 | ||
976 | free_capabilities(resource); | |
977 | res = read_capabilities(resource); | |
978 | if (res) | |
979 | goto exit_free; | |
980 | ||
981 | resource->trip[0] = resource->trip[1] = -1; | |
982 | ||
983 | res = setup_attrs(resource); | |
984 | if (res) | |
985 | goto exit_free; | |
986 | ||
987 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
988 | if (IS_ERR(resource->hwmon_dev)) { | |
989 | res = PTR_ERR(resource->hwmon_dev); | |
990 | goto exit_remove; | |
991 | } | |
992 | ||
993 | res = 0; | |
994 | goto exit; | |
995 | ||
996 | exit_remove: | |
997 | remove_attrs(resource); | |
998 | exit_free: | |
999 | kfree(resource); | |
1000 | exit: | |
1001 | return res; | |
1002 | } | |
1003 | ||
1004 | static int acpi_power_meter_remove(struct acpi_device *device, int type) | |
1005 | { | |
1006 | struct acpi_power_meter_resource *resource; | |
1007 | ||
1008 | if (!device || !acpi_driver_data(device)) | |
1009 | return -EINVAL; | |
1010 | ||
1011 | resource = acpi_driver_data(device); | |
1012 | hwmon_device_unregister(resource->hwmon_dev); | |
1013 | ||
1014 | free_capabilities(resource); | |
1015 | remove_attrs(resource); | |
1016 | ||
1017 | kfree(resource); | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static int acpi_power_meter_resume(struct acpi_device *device) | |
1022 | { | |
1023 | struct acpi_power_meter_resource *resource; | |
1024 | ||
1025 | if (!device || !acpi_driver_data(device)) | |
1026 | return -EINVAL; | |
1027 | ||
1028 | resource = acpi_driver_data(device); | |
1029 | free_capabilities(resource); | |
1030 | read_capabilities(resource); | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static struct acpi_driver acpi_power_meter_driver = { | |
1036 | .name = "power_meter", | |
1037 | .class = ACPI_POWER_METER_CLASS, | |
1038 | .ids = power_meter_ids, | |
1039 | .ops = { | |
1040 | .add = acpi_power_meter_add, | |
1041 | .remove = acpi_power_meter_remove, | |
1042 | .resume = acpi_power_meter_resume, | |
1043 | .notify = acpi_power_meter_notify, | |
1044 | }, | |
1045 | }; | |
1046 | ||
1047 | /* Module init/exit routines */ | |
1048 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
1049 | { | |
1050 | cap_in_hardware = 1; | |
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
1055 | { | |
1056 | enable_cap_knobs, "IBM Active Energy Manager", | |
1057 | { | |
1058 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
1059 | }, | |
1060 | }, | |
1061 | {} | |
1062 | }; | |
1063 | ||
1064 | static int __init acpi_power_meter_init(void) | |
1065 | { | |
1066 | int result; | |
1067 | ||
1068 | if (acpi_disabled) | |
1069 | return -ENODEV; | |
1070 | ||
1071 | dmi_check_system(pm_dmi_table); | |
1072 | ||
1073 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
1074 | if (result < 0) | |
1075 | return -ENODEV; | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static void __exit acpi_power_meter_exit(void) | |
1081 | { | |
1082 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1083 | } | |
1084 | ||
1085 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
1086 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); | |
1087 | MODULE_LICENSE("GPL"); | |
1088 | ||
1089 | module_param(force_cap_on, bool, 0644); | |
1090 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1091 | ||
1092 | module_init(acpi_power_meter_init); | |
1093 | module_exit(acpi_power_meter_exit); |