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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; | |
61 | static int force_cap_on; | |
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 | ||
110 | struct ro_sensor_template { | |
111 | char *label; | |
112 | ssize_t (*show)(struct device *dev, | |
113 | struct device_attribute *devattr, | |
114 | char *buf); | |
115 | int index; | |
116 | }; | |
117 | ||
118 | struct rw_sensor_template { | |
119 | char *label; | |
120 | ssize_t (*show)(struct device *dev, | |
121 | struct device_attribute *devattr, | |
122 | char *buf); | |
123 | ssize_t (*set)(struct device *dev, | |
124 | struct device_attribute *devattr, | |
125 | const char *buf, size_t count); | |
126 | int index; | |
127 | }; | |
128 | ||
129 | /* Averaging interval */ | |
130 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
131 | { | |
132 | unsigned long long data; | |
133 | acpi_status status; | |
134 | ||
135 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
136 | NULL, &data); | |
137 | if (ACPI_FAILURE(status)) { | |
138 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
139 | return -ENODEV; | |
140 | } | |
141 | ||
142 | resource->avg_interval = data; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static ssize_t show_avg_interval(struct device *dev, | |
147 | struct device_attribute *devattr, | |
148 | char *buf) | |
149 | { | |
150 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
151 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
152 | ||
153 | mutex_lock(&resource->lock); | |
154 | update_avg_interval(resource); | |
155 | mutex_unlock(&resource->lock); | |
156 | ||
157 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
158 | } | |
159 | ||
160 | static ssize_t set_avg_interval(struct device *dev, | |
161 | struct device_attribute *devattr, | |
162 | const char *buf, size_t count) | |
163 | { | |
164 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
165 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
166 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
167 | struct acpi_object_list args = { 1, &arg0 }; | |
168 | int res; | |
169 | unsigned long temp; | |
170 | unsigned long long data; | |
171 | acpi_status status; | |
172 | ||
173 | res = strict_strtoul(buf, 10, &temp); | |
174 | if (res) | |
175 | return res; | |
176 | ||
177 | if (temp > resource->caps.max_avg_interval || | |
178 | temp < resource->caps.min_avg_interval) | |
179 | return -EINVAL; | |
180 | arg0.integer.value = temp; | |
181 | ||
182 | mutex_lock(&resource->lock); | |
183 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
184 | &args, &data); | |
185 | if (!ACPI_FAILURE(status)) | |
186 | resource->avg_interval = temp; | |
187 | mutex_unlock(&resource->lock); | |
188 | ||
189 | if (ACPI_FAILURE(status)) { | |
190 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | /* _PAI returns 0 on success, nonzero otherwise */ | |
195 | if (data) | |
196 | return -EINVAL; | |
197 | ||
198 | return count; | |
199 | } | |
200 | ||
201 | /* Cap functions */ | |
202 | static int update_cap(struct acpi_power_meter_resource *resource) | |
203 | { | |
204 | unsigned long long data; | |
205 | acpi_status status; | |
206 | ||
207 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
208 | NULL, &data); | |
209 | if (ACPI_FAILURE(status)) { | |
210 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
211 | return -ENODEV; | |
212 | } | |
213 | ||
214 | resource->cap = data; | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static ssize_t show_cap(struct device *dev, | |
219 | struct device_attribute *devattr, | |
220 | char *buf) | |
221 | { | |
222 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
223 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
224 | ||
225 | mutex_lock(&resource->lock); | |
226 | update_cap(resource); | |
227 | mutex_unlock(&resource->lock); | |
228 | ||
229 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
230 | } | |
231 | ||
232 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
233 | const char *buf, size_t count) | |
234 | { | |
235 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
236 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
237 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
238 | struct acpi_object_list args = { 1, &arg0 }; | |
239 | int res; | |
240 | unsigned long temp; | |
241 | unsigned long long data; | |
242 | acpi_status status; | |
243 | ||
244 | res = strict_strtoul(buf, 10, &temp); | |
245 | if (res) | |
246 | return res; | |
247 | ||
248 | temp /= 1000; | |
249 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) | |
250 | return -EINVAL; | |
251 | arg0.integer.value = temp; | |
252 | ||
253 | mutex_lock(&resource->lock); | |
254 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
255 | &args, &data); | |
256 | if (!ACPI_FAILURE(status)) | |
257 | resource->cap = temp; | |
258 | mutex_unlock(&resource->lock); | |
259 | ||
260 | if (ACPI_FAILURE(status)) { | |
261 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | /* _SHL returns 0 on success, nonzero otherwise */ | |
266 | if (data) | |
267 | return -EINVAL; | |
268 | ||
269 | return count; | |
270 | } | |
271 | ||
272 | /* Power meter trip points */ | |
273 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
274 | { | |
275 | union acpi_object arg_objs[] = { | |
276 | {ACPI_TYPE_INTEGER}, | |
277 | {ACPI_TYPE_INTEGER} | |
278 | }; | |
279 | struct acpi_object_list args = { 2, arg_objs }; | |
280 | unsigned long long data; | |
281 | acpi_status status; | |
282 | ||
283 | /* Both trip levels must be set */ | |
284 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
285 | return 0; | |
286 | ||
287 | /* This driver stores min, max; ACPI wants max, min. */ | |
288 | arg_objs[0].integer.value = resource->trip[1]; | |
289 | arg_objs[1].integer.value = resource->trip[0]; | |
290 | ||
291 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
292 | &args, &data); | |
293 | if (ACPI_FAILURE(status)) { | |
294 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
295 | return -EINVAL; | |
296 | } | |
297 | ||
22aecebf DW |
298 | /* _PTP returns 0 on success, nonzero otherwise */ |
299 | if (data) | |
300 | return -EINVAL; | |
301 | ||
302 | return 0; | |
de584afa DW |
303 | } |
304 | ||
305 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
306 | const char *buf, size_t count) | |
307 | { | |
308 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
309 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
310 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
311 | int res; | |
312 | unsigned long temp; | |
313 | ||
314 | res = strict_strtoul(buf, 10, &temp); | |
315 | if (res) | |
316 | return res; | |
317 | ||
318 | temp /= 1000; | |
319 | if (temp < 0) | |
320 | return -EINVAL; | |
321 | ||
322 | mutex_lock(&resource->lock); | |
323 | resource->trip[attr->index - 7] = temp; | |
324 | res = set_acpi_trip(resource); | |
325 | mutex_unlock(&resource->lock); | |
326 | ||
327 | if (res) | |
328 | return res; | |
329 | ||
330 | return count; | |
331 | } | |
332 | ||
333 | /* Power meter */ | |
334 | static int update_meter(struct acpi_power_meter_resource *resource) | |
335 | { | |
336 | unsigned long long data; | |
337 | acpi_status status; | |
338 | unsigned long local_jiffies = jiffies; | |
339 | ||
340 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
341 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
342 | resource->sensors_valid) | |
343 | return 0; | |
344 | ||
345 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
346 | NULL, &data); | |
347 | if (ACPI_FAILURE(status)) { | |
348 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
349 | return -ENODEV; | |
350 | } | |
351 | ||
352 | resource->power = data; | |
353 | resource->sensors_valid = 1; | |
354 | resource->sensors_last_updated = jiffies; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static ssize_t show_power(struct device *dev, | |
359 | struct device_attribute *devattr, | |
360 | char *buf) | |
361 | { | |
362 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
363 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
364 | ||
365 | mutex_lock(&resource->lock); | |
366 | update_meter(resource); | |
367 | mutex_unlock(&resource->lock); | |
368 | ||
369 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
370 | } | |
371 | ||
372 | /* Miscellaneous */ | |
373 | static ssize_t show_str(struct device *dev, | |
374 | struct device_attribute *devattr, | |
375 | char *buf) | |
376 | { | |
377 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
378 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
379 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
380 | acpi_string val; | |
381 | ||
382 | switch (attr->index) { | |
383 | case 0: | |
384 | val = resource->model_number; | |
385 | break; | |
386 | case 1: | |
387 | val = resource->serial_number; | |
388 | break; | |
389 | case 2: | |
390 | val = resource->oem_info; | |
391 | break; | |
392 | default: | |
393 | BUG(); | |
394 | } | |
395 | ||
396 | return sprintf(buf, "%s\n", val); | |
397 | } | |
398 | ||
399 | static ssize_t show_val(struct device *dev, | |
400 | struct device_attribute *devattr, | |
401 | char *buf) | |
402 | { | |
403 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
404 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
405 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 406 | u64 val = 0; |
de584afa DW |
407 | |
408 | switch (attr->index) { | |
409 | case 0: | |
410 | val = resource->caps.min_avg_interval; | |
411 | break; | |
412 | case 1: | |
413 | val = resource->caps.max_avg_interval; | |
414 | break; | |
415 | case 2: | |
416 | val = resource->caps.min_cap * 1000; | |
417 | break; | |
418 | case 3: | |
419 | val = resource->caps.max_cap * 1000; | |
420 | break; | |
421 | case 4: | |
422 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
423 | return sprintf(buf, "unknown\n"); | |
424 | ||
425 | val = resource->caps.hysteresis * 1000; | |
426 | break; | |
427 | case 5: | |
428 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
429 | val = 1; | |
430 | else | |
431 | val = 0; | |
432 | break; | |
433 | case 6: | |
434 | if (resource->power > resource->cap) | |
435 | val = 1; | |
436 | else | |
437 | val = 0; | |
438 | break; | |
439 | case 7: | |
440 | case 8: | |
441 | if (resource->trip[attr->index - 7] < 0) | |
442 | return sprintf(buf, "unknown\n"); | |
443 | ||
444 | val = resource->trip[attr->index - 7] * 1000; | |
445 | break; | |
446 | default: | |
447 | BUG(); | |
448 | } | |
449 | ||
450 | return sprintf(buf, "%llu\n", val); | |
451 | } | |
452 | ||
453 | static ssize_t show_accuracy(struct device *dev, | |
454 | struct device_attribute *devattr, | |
455 | char *buf) | |
456 | { | |
457 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
458 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
459 | unsigned int acc = resource->caps.accuracy; | |
460 | ||
461 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
462 | } | |
463 | ||
464 | static ssize_t show_name(struct device *dev, | |
465 | struct device_attribute *devattr, | |
466 | char *buf) | |
467 | { | |
468 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
469 | } | |
470 | ||
471 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ | |
472 | static struct ro_sensor_template meter_ro_attrs[] = { | |
473 | {POWER_AVERAGE_NAME, show_power, 0}, | |
474 | {"power1_accuracy", show_accuracy, 0}, | |
475 | {"power1_average_interval_min", show_val, 0}, | |
476 | {"power1_average_interval_max", show_val, 1}, | |
477 | {"power1_is_battery", show_val, 5}, | |
478 | {NULL, NULL, 0}, | |
479 | }; | |
480 | ||
481 | static struct rw_sensor_template meter_rw_attrs[] = { | |
482 | {POWER_AVG_INTERVAL_NAME, show_avg_interval, set_avg_interval, 0}, | |
483 | {NULL, NULL, NULL, 0}, | |
484 | }; | |
485 | ||
486 | static struct ro_sensor_template misc_cap_attrs[] = { | |
487 | {"power1_cap_min", show_val, 2}, | |
488 | {"power1_cap_max", show_val, 3}, | |
489 | {"power1_cap_hyst", show_val, 4}, | |
490 | {POWER_ALARM_NAME, show_val, 6}, | |
491 | {NULL, NULL, 0}, | |
492 | }; | |
493 | ||
494 | static struct ro_sensor_template ro_cap_attrs[] = { | |
495 | {POWER_CAP_NAME, show_cap, 0}, | |
496 | {NULL, NULL, 0}, | |
497 | }; | |
498 | ||
499 | static struct rw_sensor_template rw_cap_attrs[] = { | |
500 | {POWER_CAP_NAME, show_cap, set_cap, 0}, | |
501 | {NULL, NULL, NULL, 0}, | |
502 | }; | |
503 | ||
504 | static struct rw_sensor_template trip_attrs[] = { | |
505 | {"power1_average_min", show_val, set_trip, 7}, | |
506 | {"power1_average_max", show_val, set_trip, 8}, | |
507 | {NULL, NULL, NULL, 0}, | |
508 | }; | |
509 | ||
510 | static struct ro_sensor_template misc_attrs[] = { | |
511 | {"name", show_name, 0}, | |
512 | {"power1_model_number", show_str, 0}, | |
513 | {"power1_oem_info", show_str, 2}, | |
514 | {"power1_serial_number", show_str, 1}, | |
515 | {NULL, NULL, 0}, | |
516 | }; | |
517 | ||
518 | /* Read power domain data */ | |
519 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
520 | { | |
521 | int i; | |
522 | ||
523 | if (!resource->num_domain_devices) | |
524 | return; | |
525 | ||
526 | for (i = 0; i < resource->num_domain_devices; i++) { | |
527 | struct acpi_device *obj = resource->domain_devices[i]; | |
528 | if (!obj) | |
529 | continue; | |
530 | ||
531 | sysfs_remove_link(resource->holders_dir, | |
532 | kobject_name(&obj->dev.kobj)); | |
533 | put_device(&obj->dev); | |
534 | } | |
535 | ||
536 | kfree(resource->domain_devices); | |
537 | kobject_put(resource->holders_dir); | |
7f07a605 | 538 | resource->num_domain_devices = 0; |
de584afa DW |
539 | } |
540 | ||
541 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
542 | { | |
543 | int res = 0; | |
544 | int i; | |
545 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
546 | union acpi_object *pss; | |
547 | acpi_status status; | |
548 | ||
549 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
550 | &buffer); | |
551 | if (ACPI_FAILURE(status)) { | |
552 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
553 | return -ENODEV; | |
554 | } | |
555 | ||
556 | pss = buffer.pointer; | |
557 | if (!pss || | |
558 | pss->type != ACPI_TYPE_PACKAGE) { | |
559 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
560 | "Invalid _PMD data\n"); | |
561 | res = -EFAULT; | |
562 | goto end; | |
563 | } | |
564 | ||
565 | if (!pss->package.count) | |
566 | goto end; | |
567 | ||
568 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
569 | pss->package.count, GFP_KERNEL); | |
570 | if (!resource->domain_devices) { | |
571 | res = -ENOMEM; | |
572 | goto end; | |
573 | } | |
574 | ||
575 | resource->holders_dir = kobject_create_and_add("measures", | |
576 | &resource->acpi_dev->dev.kobj); | |
577 | if (!resource->holders_dir) { | |
578 | res = -ENOMEM; | |
579 | goto exit_free; | |
580 | } | |
581 | ||
582 | resource->num_domain_devices = pss->package.count; | |
583 | ||
584 | for (i = 0; i < pss->package.count; i++) { | |
585 | struct acpi_device *obj; | |
586 | union acpi_object *element = &(pss->package.elements[i]); | |
587 | ||
588 | /* Refuse non-references */ | |
589 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
590 | continue; | |
591 | ||
592 | /* Create a symlink to domain objects */ | |
593 | resource->domain_devices[i] = NULL; | |
594 | status = acpi_bus_get_device(element->reference.handle, | |
595 | &resource->domain_devices[i]); | |
596 | if (ACPI_FAILURE(status)) | |
597 | continue; | |
598 | ||
599 | obj = resource->domain_devices[i]; | |
600 | get_device(&obj->dev); | |
601 | ||
602 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
603 | kobject_name(&obj->dev.kobj)); | |
604 | if (res) { | |
605 | put_device(&obj->dev); | |
606 | resource->domain_devices[i] = NULL; | |
607 | } | |
608 | } | |
609 | ||
610 | res = 0; | |
611 | goto end; | |
612 | ||
613 | exit_free: | |
614 | kfree(resource->domain_devices); | |
615 | end: | |
616 | kfree(buffer.pointer); | |
617 | return res; | |
618 | } | |
619 | ||
620 | /* Registration and deregistration */ | |
621 | static int register_ro_attrs(struct acpi_power_meter_resource *resource, | |
622 | struct ro_sensor_template *ro) | |
623 | { | |
624 | struct device *dev = &resource->acpi_dev->dev; | |
625 | struct sensor_device_attribute *sensors = | |
626 | &resource->sensors[resource->num_sensors]; | |
627 | int res = 0; | |
628 | ||
629 | while (ro->label) { | |
630 | sensors->dev_attr.attr.name = ro->label; | |
631 | sensors->dev_attr.attr.mode = S_IRUGO; | |
632 | sensors->dev_attr.show = ro->show; | |
633 | sensors->index = ro->index; | |
634 | ||
635 | res = device_create_file(dev, &sensors->dev_attr); | |
636 | if (res) { | |
637 | sensors->dev_attr.attr.name = NULL; | |
638 | goto error; | |
639 | } | |
640 | sensors++; | |
641 | resource->num_sensors++; | |
642 | ro++; | |
643 | } | |
644 | ||
645 | error: | |
646 | return res; | |
647 | } | |
648 | ||
649 | static int register_rw_attrs(struct acpi_power_meter_resource *resource, | |
650 | struct rw_sensor_template *rw) | |
651 | { | |
652 | struct device *dev = &resource->acpi_dev->dev; | |
653 | struct sensor_device_attribute *sensors = | |
654 | &resource->sensors[resource->num_sensors]; | |
655 | int res = 0; | |
656 | ||
657 | while (rw->label) { | |
658 | sensors->dev_attr.attr.name = rw->label; | |
659 | sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; | |
660 | sensors->dev_attr.show = rw->show; | |
661 | sensors->dev_attr.store = rw->set; | |
662 | sensors->index = rw->index; | |
663 | ||
664 | res = device_create_file(dev, &sensors->dev_attr); | |
665 | if (res) { | |
666 | sensors->dev_attr.attr.name = NULL; | |
667 | goto error; | |
668 | } | |
669 | sensors++; | |
670 | resource->num_sensors++; | |
671 | rw++; | |
672 | } | |
673 | ||
674 | error: | |
675 | return res; | |
676 | } | |
677 | ||
678 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
679 | { | |
680 | int i; | |
681 | ||
682 | for (i = 0; i < resource->num_sensors; i++) { | |
683 | if (!resource->sensors[i].dev_attr.attr.name) | |
684 | continue; | |
685 | device_remove_file(&resource->acpi_dev->dev, | |
686 | &resource->sensors[i].dev_attr); | |
687 | } | |
688 | ||
689 | remove_domain_devices(resource); | |
690 | ||
691 | resource->num_sensors = 0; | |
692 | } | |
693 | ||
694 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
695 | { | |
696 | int res = 0; | |
697 | ||
698 | res = read_domain_devices(resource); | |
699 | if (res) | |
700 | return res; | |
701 | ||
702 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
703 | res = register_ro_attrs(resource, meter_ro_attrs); | |
704 | if (res) | |
705 | goto error; | |
706 | res = register_rw_attrs(resource, meter_rw_attrs); | |
707 | if (res) | |
708 | goto error; | |
709 | } | |
710 | ||
711 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
712 | if (!can_cap_in_hardware()) { | |
713 | dev_err(&resource->acpi_dev->dev, | |
714 | "Ignoring unsafe software power cap!\n"); | |
715 | goto skip_unsafe_cap; | |
716 | } | |
717 | ||
718 | if (resource->caps.configurable_cap) { | |
719 | res = register_rw_attrs(resource, rw_cap_attrs); | |
720 | if (res) | |
721 | goto error; | |
722 | } else { | |
723 | res = register_ro_attrs(resource, ro_cap_attrs); | |
724 | if (res) | |
725 | goto error; | |
726 | } | |
727 | res = register_ro_attrs(resource, misc_cap_attrs); | |
728 | if (res) | |
729 | goto error; | |
730 | } | |
731 | skip_unsafe_cap: | |
732 | ||
733 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { | |
734 | res = register_rw_attrs(resource, trip_attrs); | |
735 | if (res) | |
736 | goto error; | |
737 | } | |
738 | ||
739 | res = register_ro_attrs(resource, misc_attrs); | |
740 | if (res) | |
741 | goto error; | |
742 | ||
743 | return res; | |
744 | error: | |
de584afa DW |
745 | remove_attrs(resource); |
746 | return res; | |
747 | } | |
748 | ||
749 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
750 | { | |
751 | acpi_string *str; | |
752 | int i; | |
753 | ||
754 | str = &resource->model_number; | |
755 | for (i = 0; i < 3; i++, str++) | |
756 | kfree(*str); | |
757 | } | |
758 | ||
759 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
760 | { | |
761 | int res = 0; | |
762 | int i; | |
763 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
764 | struct acpi_buffer state = { 0, NULL }; | |
765 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
766 | union acpi_object *pss; | |
767 | acpi_string *str; | |
768 | acpi_status status; | |
769 | ||
770 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
771 | &buffer); | |
772 | if (ACPI_FAILURE(status)) { | |
773 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
774 | return -ENODEV; | |
775 | } | |
776 | ||
777 | pss = buffer.pointer; | |
778 | if (!pss || | |
779 | pss->type != ACPI_TYPE_PACKAGE || | |
780 | pss->package.count != 14) { | |
781 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
782 | "Invalid _PMC data\n"); | |
783 | res = -EFAULT; | |
784 | goto end; | |
785 | } | |
786 | ||
787 | /* Grab all the integer data at once */ | |
788 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
789 | state.pointer = &resource->caps; | |
790 | ||
791 | status = acpi_extract_package(pss, &format, &state); | |
792 | if (ACPI_FAILURE(status)) { | |
793 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
794 | res = -EFAULT; | |
795 | goto end; | |
796 | } | |
797 | ||
798 | if (resource->caps.units) { | |
799 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
800 | "Unknown units %llu.\n", | |
801 | resource->caps.units); | |
802 | res = -EINVAL; | |
803 | goto end; | |
804 | } | |
805 | ||
806 | /* Grab the string data */ | |
807 | str = &resource->model_number; | |
808 | ||
809 | for (i = 11; i < 14; i++) { | |
810 | union acpi_object *element = &(pss->package.elements[i]); | |
811 | ||
812 | if (element->type != ACPI_TYPE_STRING) { | |
813 | res = -EINVAL; | |
814 | goto error; | |
815 | } | |
816 | ||
817 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
818 | GFP_KERNEL); | |
819 | if (!*str) { | |
820 | res = -ENOMEM; | |
821 | goto error; | |
822 | } | |
823 | ||
824 | strncpy(*str, element->string.pointer, element->string.length); | |
825 | str++; | |
826 | } | |
827 | ||
828 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
829 | goto end; | |
830 | error: | |
831 | str = &resource->model_number; | |
832 | for (i = 0; i < 3; i++, str++) | |
833 | kfree(*str); | |
834 | end: | |
835 | kfree(buffer.pointer); | |
836 | return res; | |
837 | } | |
838 | ||
839 | /* Handle ACPI event notifications */ | |
840 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
841 | { | |
842 | struct acpi_power_meter_resource *resource; | |
843 | int res; | |
844 | ||
845 | if (!device || !acpi_driver_data(device)) | |
846 | return; | |
847 | ||
848 | resource = acpi_driver_data(device); | |
849 | ||
850 | mutex_lock(&resource->lock); | |
851 | switch (event) { | |
852 | case METER_NOTIFY_CONFIG: | |
853 | free_capabilities(resource); | |
854 | res = read_capabilities(resource); | |
855 | if (res) | |
856 | break; | |
857 | ||
858 | remove_attrs(resource); | |
859 | setup_attrs(resource); | |
860 | break; | |
861 | case METER_NOTIFY_TRIP: | |
862 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
863 | update_meter(resource); | |
864 | break; | |
865 | case METER_NOTIFY_CAP: | |
866 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
867 | update_cap(resource); | |
868 | break; | |
869 | case METER_NOTIFY_INTERVAL: | |
870 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
871 | update_avg_interval(resource); | |
872 | break; | |
873 | case METER_NOTIFY_CAPPING: | |
874 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
875 | dev_info(&device->dev, "Capping in progress.\n"); | |
876 | break; | |
877 | default: | |
878 | BUG(); | |
879 | } | |
880 | mutex_unlock(&resource->lock); | |
881 | ||
882 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
883 | dev_name(&device->dev), event, 0); | |
884 | } | |
885 | ||
886 | static int acpi_power_meter_add(struct acpi_device *device) | |
887 | { | |
888 | int res; | |
889 | struct acpi_power_meter_resource *resource; | |
890 | ||
891 | if (!device) | |
892 | return -EINVAL; | |
893 | ||
894 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
895 | GFP_KERNEL); | |
896 | if (!resource) | |
897 | return -ENOMEM; | |
898 | ||
899 | resource->sensors_valid = 0; | |
900 | resource->acpi_dev = device; | |
901 | mutex_init(&resource->lock); | |
902 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
903 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
904 | device->driver_data = resource; | |
905 | ||
906 | free_capabilities(resource); | |
907 | res = read_capabilities(resource); | |
908 | if (res) | |
909 | goto exit_free; | |
910 | ||
911 | resource->trip[0] = resource->trip[1] = -1; | |
912 | ||
913 | res = setup_attrs(resource); | |
914 | if (res) | |
915 | goto exit_free; | |
916 | ||
917 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
918 | if (IS_ERR(resource->hwmon_dev)) { | |
919 | res = PTR_ERR(resource->hwmon_dev); | |
920 | goto exit_remove; | |
921 | } | |
922 | ||
923 | res = 0; | |
924 | goto exit; | |
925 | ||
926 | exit_remove: | |
927 | remove_attrs(resource); | |
928 | exit_free: | |
929 | kfree(resource); | |
930 | exit: | |
931 | return res; | |
932 | } | |
933 | ||
934 | static int acpi_power_meter_remove(struct acpi_device *device, int type) | |
935 | { | |
936 | struct acpi_power_meter_resource *resource; | |
937 | ||
938 | if (!device || !acpi_driver_data(device)) | |
939 | return -EINVAL; | |
940 | ||
941 | resource = acpi_driver_data(device); | |
942 | hwmon_device_unregister(resource->hwmon_dev); | |
943 | ||
944 | free_capabilities(resource); | |
945 | remove_attrs(resource); | |
946 | ||
947 | kfree(resource); | |
948 | return 0; | |
949 | } | |
950 | ||
951 | static int acpi_power_meter_resume(struct acpi_device *device) | |
952 | { | |
953 | struct acpi_power_meter_resource *resource; | |
954 | ||
955 | if (!device || !acpi_driver_data(device)) | |
956 | return -EINVAL; | |
957 | ||
958 | resource = acpi_driver_data(device); | |
959 | free_capabilities(resource); | |
960 | read_capabilities(resource); | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
965 | static struct acpi_driver acpi_power_meter_driver = { | |
966 | .name = "power_meter", | |
967 | .class = ACPI_POWER_METER_CLASS, | |
968 | .ids = power_meter_ids, | |
969 | .ops = { | |
970 | .add = acpi_power_meter_add, | |
971 | .remove = acpi_power_meter_remove, | |
972 | .resume = acpi_power_meter_resume, | |
973 | .notify = acpi_power_meter_notify, | |
974 | }, | |
975 | }; | |
976 | ||
977 | /* Module init/exit routines */ | |
978 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
979 | { | |
980 | cap_in_hardware = 1; | |
981 | return 0; | |
982 | } | |
983 | ||
984 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
985 | { | |
986 | enable_cap_knobs, "IBM Active Energy Manager", | |
987 | { | |
988 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
989 | }, | |
990 | }, | |
991 | {} | |
992 | }; | |
993 | ||
994 | static int __init acpi_power_meter_init(void) | |
995 | { | |
996 | int result; | |
997 | ||
998 | if (acpi_disabled) | |
999 | return -ENODEV; | |
1000 | ||
1001 | dmi_check_system(pm_dmi_table); | |
1002 | ||
1003 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
1004 | if (result < 0) | |
1005 | return -ENODEV; | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static void __exit acpi_power_meter_exit(void) | |
1011 | { | |
1012 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1013 | } | |
1014 | ||
1015 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
1016 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); | |
1017 | MODULE_LICENSE("GPL"); | |
1018 | ||
1019 | module_param(force_cap_on, bool, 0644); | |
1020 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1021 | ||
1022 | module_init(acpi_power_meter_init); | |
1023 | module_exit(acpi_power_meter_exit); |