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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> | |
28 | #include <linux/kdev_t.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/time.h> | |
31 | #include <acpi/acpi_drivers.h> | |
32 | #include <acpi/acpi_bus.h> | |
33 | ||
34 | #define ACPI_POWER_METER_NAME "power_meter" | |
35 | ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); | |
36 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" | |
37 | #define ACPI_POWER_METER_CLASS "power_meter_resource" | |
38 | ||
39 | #define NUM_SENSORS 17 | |
40 | ||
41 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
42 | #define POWER_METER_CAN_TRIP (1 << 1) | |
43 | #define POWER_METER_CAN_CAP (1 << 2) | |
44 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
45 | #define POWER_METER_IS_BATTERY (1 << 8) | |
46 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
47 | ||
48 | #define METER_NOTIFY_CONFIG 0x80 | |
49 | #define METER_NOTIFY_TRIP 0x81 | |
50 | #define METER_NOTIFY_CAP 0x82 | |
51 | #define METER_NOTIFY_CAPPING 0x83 | |
52 | #define METER_NOTIFY_INTERVAL 0x84 | |
53 | ||
54 | #define POWER_AVERAGE_NAME "power1_average" | |
55 | #define POWER_CAP_NAME "power1_cap" | |
56 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
57 | #define POWER_ALARM_NAME "power1_alarm" | |
58 | ||
59 | static int cap_in_hardware; | |
60 | static int force_cap_on; | |
61 | ||
62 | static int can_cap_in_hardware(void) | |
63 | { | |
64 | return force_cap_on || cap_in_hardware; | |
65 | } | |
66 | ||
c97adf9e | 67 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
68 | {"ACPI000D", 0}, |
69 | {"", 0}, | |
70 | }; | |
71 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
72 | ||
73 | struct acpi_power_meter_capabilities { | |
74 | acpi_integer flags; | |
75 | acpi_integer units; | |
76 | acpi_integer type; | |
77 | acpi_integer accuracy; | |
78 | acpi_integer sampling_time; | |
79 | acpi_integer min_avg_interval; | |
80 | acpi_integer max_avg_interval; | |
81 | acpi_integer hysteresis; | |
82 | acpi_integer configurable_cap; | |
83 | acpi_integer min_cap; | |
84 | acpi_integer max_cap; | |
85 | }; | |
86 | ||
87 | struct acpi_power_meter_resource { | |
88 | struct acpi_device *acpi_dev; | |
89 | acpi_bus_id name; | |
90 | struct mutex lock; | |
91 | struct device *hwmon_dev; | |
92 | struct acpi_power_meter_capabilities caps; | |
93 | acpi_string model_number; | |
94 | acpi_string serial_number; | |
95 | acpi_string oem_info; | |
96 | acpi_integer power; | |
97 | acpi_integer cap; | |
98 | acpi_integer avg_interval; | |
99 | int sensors_valid; | |
100 | unsigned long sensors_last_updated; | |
101 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
102 | int num_sensors; | |
103 | int trip[2]; | |
104 | int num_domain_devices; | |
105 | struct acpi_device **domain_devices; | |
106 | struct kobject *holders_dir; | |
107 | }; | |
108 | ||
109 | struct ro_sensor_template { | |
110 | char *label; | |
111 | ssize_t (*show)(struct device *dev, | |
112 | struct device_attribute *devattr, | |
113 | char *buf); | |
114 | int index; | |
115 | }; | |
116 | ||
117 | struct rw_sensor_template { | |
118 | char *label; | |
119 | ssize_t (*show)(struct device *dev, | |
120 | struct device_attribute *devattr, | |
121 | char *buf); | |
122 | ssize_t (*set)(struct device *dev, | |
123 | struct device_attribute *devattr, | |
124 | const char *buf, size_t count); | |
125 | int index; | |
126 | }; | |
127 | ||
128 | /* Averaging interval */ | |
129 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
130 | { | |
131 | unsigned long long data; | |
132 | acpi_status status; | |
133 | ||
134 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
135 | NULL, &data); | |
136 | if (ACPI_FAILURE(status)) { | |
137 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
138 | return -ENODEV; | |
139 | } | |
140 | ||
141 | resource->avg_interval = data; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static ssize_t show_avg_interval(struct device *dev, | |
146 | struct device_attribute *devattr, | |
147 | char *buf) | |
148 | { | |
149 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
150 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
151 | ||
152 | mutex_lock(&resource->lock); | |
153 | update_avg_interval(resource); | |
154 | mutex_unlock(&resource->lock); | |
155 | ||
156 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
157 | } | |
158 | ||
159 | static ssize_t set_avg_interval(struct device *dev, | |
160 | struct device_attribute *devattr, | |
161 | const char *buf, size_t count) | |
162 | { | |
163 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
164 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
165 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
166 | struct acpi_object_list args = { 1, &arg0 }; | |
167 | int res; | |
168 | unsigned long temp; | |
169 | unsigned long long data; | |
170 | acpi_status status; | |
171 | ||
172 | res = strict_strtoul(buf, 10, &temp); | |
173 | if (res) | |
174 | return res; | |
175 | ||
176 | if (temp > resource->caps.max_avg_interval || | |
177 | temp < resource->caps.min_avg_interval) | |
178 | return -EINVAL; | |
179 | arg0.integer.value = temp; | |
180 | ||
181 | mutex_lock(&resource->lock); | |
182 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
183 | &args, &data); | |
184 | if (!ACPI_FAILURE(status)) | |
185 | resource->avg_interval = temp; | |
186 | mutex_unlock(&resource->lock); | |
187 | ||
188 | if (ACPI_FAILURE(status)) { | |
189 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | /* _PAI returns 0 on success, nonzero otherwise */ | |
194 | if (data) | |
195 | return -EINVAL; | |
196 | ||
197 | return count; | |
198 | } | |
199 | ||
200 | /* Cap functions */ | |
201 | static int update_cap(struct acpi_power_meter_resource *resource) | |
202 | { | |
203 | unsigned long long data; | |
204 | acpi_status status; | |
205 | ||
206 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
207 | NULL, &data); | |
208 | if (ACPI_FAILURE(status)) { | |
209 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
210 | return -ENODEV; | |
211 | } | |
212 | ||
213 | resource->cap = data; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static ssize_t show_cap(struct device *dev, | |
218 | struct device_attribute *devattr, | |
219 | char *buf) | |
220 | { | |
221 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
222 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
223 | ||
224 | mutex_lock(&resource->lock); | |
225 | update_cap(resource); | |
226 | mutex_unlock(&resource->lock); | |
227 | ||
228 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
229 | } | |
230 | ||
231 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
232 | const char *buf, size_t count) | |
233 | { | |
234 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
235 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
236 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
237 | struct acpi_object_list args = { 1, &arg0 }; | |
238 | int res; | |
239 | unsigned long temp; | |
240 | unsigned long long data; | |
241 | acpi_status status; | |
242 | ||
243 | res = strict_strtoul(buf, 10, &temp); | |
244 | if (res) | |
245 | return res; | |
246 | ||
247 | temp /= 1000; | |
248 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) | |
249 | return -EINVAL; | |
250 | arg0.integer.value = temp; | |
251 | ||
252 | mutex_lock(&resource->lock); | |
253 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
254 | &args, &data); | |
255 | if (!ACPI_FAILURE(status)) | |
256 | resource->cap = temp; | |
257 | mutex_unlock(&resource->lock); | |
258 | ||
259 | if (ACPI_FAILURE(status)) { | |
260 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
261 | return -EINVAL; | |
262 | } | |
263 | ||
264 | /* _SHL returns 0 on success, nonzero otherwise */ | |
265 | if (data) | |
266 | return -EINVAL; | |
267 | ||
268 | return count; | |
269 | } | |
270 | ||
271 | /* Power meter trip points */ | |
272 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
273 | { | |
274 | union acpi_object arg_objs[] = { | |
275 | {ACPI_TYPE_INTEGER}, | |
276 | {ACPI_TYPE_INTEGER} | |
277 | }; | |
278 | struct acpi_object_list args = { 2, arg_objs }; | |
279 | unsigned long long data; | |
280 | acpi_status status; | |
281 | ||
282 | /* Both trip levels must be set */ | |
283 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
284 | return 0; | |
285 | ||
286 | /* This driver stores min, max; ACPI wants max, min. */ | |
287 | arg_objs[0].integer.value = resource->trip[1]; | |
288 | arg_objs[1].integer.value = resource->trip[0]; | |
289 | ||
290 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
291 | &args, &data); | |
292 | if (ACPI_FAILURE(status)) { | |
293 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
22aecebf DW |
297 | /* _PTP returns 0 on success, nonzero otherwise */ |
298 | if (data) | |
299 | return -EINVAL; | |
300 | ||
301 | return 0; | |
de584afa DW |
302 | } |
303 | ||
304 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
305 | const char *buf, size_t count) | |
306 | { | |
307 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
308 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
309 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
310 | int res; | |
311 | unsigned long temp; | |
312 | ||
313 | res = strict_strtoul(buf, 10, &temp); | |
314 | if (res) | |
315 | return res; | |
316 | ||
317 | temp /= 1000; | |
318 | if (temp < 0) | |
319 | return -EINVAL; | |
320 | ||
321 | mutex_lock(&resource->lock); | |
322 | resource->trip[attr->index - 7] = temp; | |
323 | res = set_acpi_trip(resource); | |
324 | mutex_unlock(&resource->lock); | |
325 | ||
326 | if (res) | |
327 | return res; | |
328 | ||
329 | return count; | |
330 | } | |
331 | ||
332 | /* Power meter */ | |
333 | static int update_meter(struct acpi_power_meter_resource *resource) | |
334 | { | |
335 | unsigned long long data; | |
336 | acpi_status status; | |
337 | unsigned long local_jiffies = jiffies; | |
338 | ||
339 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
340 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
341 | resource->sensors_valid) | |
342 | return 0; | |
343 | ||
344 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
345 | NULL, &data); | |
346 | if (ACPI_FAILURE(status)) { | |
347 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
348 | return -ENODEV; | |
349 | } | |
350 | ||
351 | resource->power = data; | |
352 | resource->sensors_valid = 1; | |
353 | resource->sensors_last_updated = jiffies; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static ssize_t show_power(struct device *dev, | |
358 | struct device_attribute *devattr, | |
359 | char *buf) | |
360 | { | |
361 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
362 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
363 | ||
364 | mutex_lock(&resource->lock); | |
365 | update_meter(resource); | |
366 | mutex_unlock(&resource->lock); | |
367 | ||
368 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
369 | } | |
370 | ||
371 | /* Miscellaneous */ | |
372 | static ssize_t show_str(struct device *dev, | |
373 | struct device_attribute *devattr, | |
374 | char *buf) | |
375 | { | |
376 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
377 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
378 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
379 | acpi_string val; | |
380 | ||
381 | switch (attr->index) { | |
382 | case 0: | |
383 | val = resource->model_number; | |
384 | break; | |
385 | case 1: | |
386 | val = resource->serial_number; | |
387 | break; | |
388 | case 2: | |
389 | val = resource->oem_info; | |
390 | break; | |
391 | default: | |
392 | BUG(); | |
393 | } | |
394 | ||
395 | return sprintf(buf, "%s\n", val); | |
396 | } | |
397 | ||
398 | static ssize_t show_val(struct device *dev, | |
399 | struct device_attribute *devattr, | |
400 | char *buf) | |
401 | { | |
402 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
403 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
404 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
405 | acpi_integer val = 0; | |
406 | ||
407 | switch (attr->index) { | |
408 | case 0: | |
409 | val = resource->caps.min_avg_interval; | |
410 | break; | |
411 | case 1: | |
412 | val = resource->caps.max_avg_interval; | |
413 | break; | |
414 | case 2: | |
415 | val = resource->caps.min_cap * 1000; | |
416 | break; | |
417 | case 3: | |
418 | val = resource->caps.max_cap * 1000; | |
419 | break; | |
420 | case 4: | |
421 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
422 | return sprintf(buf, "unknown\n"); | |
423 | ||
424 | val = resource->caps.hysteresis * 1000; | |
425 | break; | |
426 | case 5: | |
427 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
428 | val = 1; | |
429 | else | |
430 | val = 0; | |
431 | break; | |
432 | case 6: | |
433 | if (resource->power > resource->cap) | |
434 | val = 1; | |
435 | else | |
436 | val = 0; | |
437 | break; | |
438 | case 7: | |
439 | case 8: | |
440 | if (resource->trip[attr->index - 7] < 0) | |
441 | return sprintf(buf, "unknown\n"); | |
442 | ||
443 | val = resource->trip[attr->index - 7] * 1000; | |
444 | break; | |
445 | default: | |
446 | BUG(); | |
447 | } | |
448 | ||
449 | return sprintf(buf, "%llu\n", val); | |
450 | } | |
451 | ||
452 | static ssize_t show_accuracy(struct device *dev, | |
453 | struct device_attribute *devattr, | |
454 | char *buf) | |
455 | { | |
456 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
457 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
458 | unsigned int acc = resource->caps.accuracy; | |
459 | ||
460 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
461 | } | |
462 | ||
463 | static ssize_t show_name(struct device *dev, | |
464 | struct device_attribute *devattr, | |
465 | char *buf) | |
466 | { | |
467 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
468 | } | |
469 | ||
470 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ | |
471 | static struct ro_sensor_template meter_ro_attrs[] = { | |
472 | {POWER_AVERAGE_NAME, show_power, 0}, | |
473 | {"power1_accuracy", show_accuracy, 0}, | |
474 | {"power1_average_interval_min", show_val, 0}, | |
475 | {"power1_average_interval_max", show_val, 1}, | |
476 | {"power1_is_battery", show_val, 5}, | |
477 | {NULL, NULL, 0}, | |
478 | }; | |
479 | ||
480 | static struct rw_sensor_template meter_rw_attrs[] = { | |
481 | {POWER_AVG_INTERVAL_NAME, show_avg_interval, set_avg_interval, 0}, | |
482 | {NULL, NULL, NULL, 0}, | |
483 | }; | |
484 | ||
485 | static struct ro_sensor_template misc_cap_attrs[] = { | |
486 | {"power1_cap_min", show_val, 2}, | |
487 | {"power1_cap_max", show_val, 3}, | |
488 | {"power1_cap_hyst", show_val, 4}, | |
489 | {POWER_ALARM_NAME, show_val, 6}, | |
490 | {NULL, NULL, 0}, | |
491 | }; | |
492 | ||
493 | static struct ro_sensor_template ro_cap_attrs[] = { | |
494 | {POWER_CAP_NAME, show_cap, 0}, | |
495 | {NULL, NULL, 0}, | |
496 | }; | |
497 | ||
498 | static struct rw_sensor_template rw_cap_attrs[] = { | |
499 | {POWER_CAP_NAME, show_cap, set_cap, 0}, | |
500 | {NULL, NULL, NULL, 0}, | |
501 | }; | |
502 | ||
503 | static struct rw_sensor_template trip_attrs[] = { | |
504 | {"power1_average_min", show_val, set_trip, 7}, | |
505 | {"power1_average_max", show_val, set_trip, 8}, | |
506 | {NULL, NULL, NULL, 0}, | |
507 | }; | |
508 | ||
509 | static struct ro_sensor_template misc_attrs[] = { | |
510 | {"name", show_name, 0}, | |
511 | {"power1_model_number", show_str, 0}, | |
512 | {"power1_oem_info", show_str, 2}, | |
513 | {"power1_serial_number", show_str, 1}, | |
514 | {NULL, NULL, 0}, | |
515 | }; | |
516 | ||
517 | /* Read power domain data */ | |
518 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
519 | { | |
520 | int i; | |
521 | ||
522 | if (!resource->num_domain_devices) | |
523 | return; | |
524 | ||
525 | for (i = 0; i < resource->num_domain_devices; i++) { | |
526 | struct acpi_device *obj = resource->domain_devices[i]; | |
527 | if (!obj) | |
528 | continue; | |
529 | ||
530 | sysfs_remove_link(resource->holders_dir, | |
531 | kobject_name(&obj->dev.kobj)); | |
532 | put_device(&obj->dev); | |
533 | } | |
534 | ||
535 | kfree(resource->domain_devices); | |
536 | kobject_put(resource->holders_dir); | |
7f07a605 | 537 | resource->num_domain_devices = 0; |
de584afa DW |
538 | } |
539 | ||
540 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
541 | { | |
542 | int res = 0; | |
543 | int i; | |
544 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
545 | union acpi_object *pss; | |
546 | acpi_status status; | |
547 | ||
548 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
549 | &buffer); | |
550 | if (ACPI_FAILURE(status)) { | |
551 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
552 | return -ENODEV; | |
553 | } | |
554 | ||
555 | pss = buffer.pointer; | |
556 | if (!pss || | |
557 | pss->type != ACPI_TYPE_PACKAGE) { | |
558 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
559 | "Invalid _PMD data\n"); | |
560 | res = -EFAULT; | |
561 | goto end; | |
562 | } | |
563 | ||
564 | if (!pss->package.count) | |
565 | goto end; | |
566 | ||
567 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
568 | pss->package.count, GFP_KERNEL); | |
569 | if (!resource->domain_devices) { | |
570 | res = -ENOMEM; | |
571 | goto end; | |
572 | } | |
573 | ||
574 | resource->holders_dir = kobject_create_and_add("measures", | |
575 | &resource->acpi_dev->dev.kobj); | |
576 | if (!resource->holders_dir) { | |
577 | res = -ENOMEM; | |
578 | goto exit_free; | |
579 | } | |
580 | ||
581 | resource->num_domain_devices = pss->package.count; | |
582 | ||
583 | for (i = 0; i < pss->package.count; i++) { | |
584 | struct acpi_device *obj; | |
585 | union acpi_object *element = &(pss->package.elements[i]); | |
586 | ||
587 | /* Refuse non-references */ | |
588 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
589 | continue; | |
590 | ||
591 | /* Create a symlink to domain objects */ | |
592 | resource->domain_devices[i] = NULL; | |
593 | status = acpi_bus_get_device(element->reference.handle, | |
594 | &resource->domain_devices[i]); | |
595 | if (ACPI_FAILURE(status)) | |
596 | continue; | |
597 | ||
598 | obj = resource->domain_devices[i]; | |
599 | get_device(&obj->dev); | |
600 | ||
601 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
602 | kobject_name(&obj->dev.kobj)); | |
603 | if (res) { | |
604 | put_device(&obj->dev); | |
605 | resource->domain_devices[i] = NULL; | |
606 | } | |
607 | } | |
608 | ||
609 | res = 0; | |
610 | goto end; | |
611 | ||
612 | exit_free: | |
613 | kfree(resource->domain_devices); | |
614 | end: | |
615 | kfree(buffer.pointer); | |
616 | return res; | |
617 | } | |
618 | ||
619 | /* Registration and deregistration */ | |
620 | static int register_ro_attrs(struct acpi_power_meter_resource *resource, | |
621 | struct ro_sensor_template *ro) | |
622 | { | |
623 | struct device *dev = &resource->acpi_dev->dev; | |
624 | struct sensor_device_attribute *sensors = | |
625 | &resource->sensors[resource->num_sensors]; | |
626 | int res = 0; | |
627 | ||
628 | while (ro->label) { | |
629 | sensors->dev_attr.attr.name = ro->label; | |
630 | sensors->dev_attr.attr.mode = S_IRUGO; | |
631 | sensors->dev_attr.show = ro->show; | |
632 | sensors->index = ro->index; | |
633 | ||
634 | res = device_create_file(dev, &sensors->dev_attr); | |
635 | if (res) { | |
636 | sensors->dev_attr.attr.name = NULL; | |
637 | goto error; | |
638 | } | |
639 | sensors++; | |
640 | resource->num_sensors++; | |
641 | ro++; | |
642 | } | |
643 | ||
644 | error: | |
645 | return res; | |
646 | } | |
647 | ||
648 | static int register_rw_attrs(struct acpi_power_meter_resource *resource, | |
649 | struct rw_sensor_template *rw) | |
650 | { | |
651 | struct device *dev = &resource->acpi_dev->dev; | |
652 | struct sensor_device_attribute *sensors = | |
653 | &resource->sensors[resource->num_sensors]; | |
654 | int res = 0; | |
655 | ||
656 | while (rw->label) { | |
657 | sensors->dev_attr.attr.name = rw->label; | |
658 | sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; | |
659 | sensors->dev_attr.show = rw->show; | |
660 | sensors->dev_attr.store = rw->set; | |
661 | sensors->index = rw->index; | |
662 | ||
663 | res = device_create_file(dev, &sensors->dev_attr); | |
664 | if (res) { | |
665 | sensors->dev_attr.attr.name = NULL; | |
666 | goto error; | |
667 | } | |
668 | sensors++; | |
669 | resource->num_sensors++; | |
670 | rw++; | |
671 | } | |
672 | ||
673 | error: | |
674 | return res; | |
675 | } | |
676 | ||
677 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
678 | { | |
679 | int i; | |
680 | ||
681 | for (i = 0; i < resource->num_sensors; i++) { | |
682 | if (!resource->sensors[i].dev_attr.attr.name) | |
683 | continue; | |
684 | device_remove_file(&resource->acpi_dev->dev, | |
685 | &resource->sensors[i].dev_attr); | |
686 | } | |
687 | ||
688 | remove_domain_devices(resource); | |
689 | ||
690 | resource->num_sensors = 0; | |
691 | } | |
692 | ||
693 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
694 | { | |
695 | int res = 0; | |
696 | ||
697 | res = read_domain_devices(resource); | |
698 | if (res) | |
699 | return res; | |
700 | ||
701 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
702 | res = register_ro_attrs(resource, meter_ro_attrs); | |
703 | if (res) | |
704 | goto error; | |
705 | res = register_rw_attrs(resource, meter_rw_attrs); | |
706 | if (res) | |
707 | goto error; | |
708 | } | |
709 | ||
710 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
711 | if (!can_cap_in_hardware()) { | |
712 | dev_err(&resource->acpi_dev->dev, | |
713 | "Ignoring unsafe software power cap!\n"); | |
714 | goto skip_unsafe_cap; | |
715 | } | |
716 | ||
717 | if (resource->caps.configurable_cap) { | |
718 | res = register_rw_attrs(resource, rw_cap_attrs); | |
719 | if (res) | |
720 | goto error; | |
721 | } else { | |
722 | res = register_ro_attrs(resource, ro_cap_attrs); | |
723 | if (res) | |
724 | goto error; | |
725 | } | |
726 | res = register_ro_attrs(resource, misc_cap_attrs); | |
727 | if (res) | |
728 | goto error; | |
729 | } | |
730 | skip_unsafe_cap: | |
731 | ||
732 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { | |
733 | res = register_rw_attrs(resource, trip_attrs); | |
734 | if (res) | |
735 | goto error; | |
736 | } | |
737 | ||
738 | res = register_ro_attrs(resource, misc_attrs); | |
739 | if (res) | |
740 | goto error; | |
741 | ||
742 | return res; | |
743 | error: | |
de584afa DW |
744 | remove_attrs(resource); |
745 | return res; | |
746 | } | |
747 | ||
748 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
749 | { | |
750 | acpi_string *str; | |
751 | int i; | |
752 | ||
753 | str = &resource->model_number; | |
754 | for (i = 0; i < 3; i++, str++) | |
755 | kfree(*str); | |
756 | } | |
757 | ||
758 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
759 | { | |
760 | int res = 0; | |
761 | int i; | |
762 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
763 | struct acpi_buffer state = { 0, NULL }; | |
764 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
765 | union acpi_object *pss; | |
766 | acpi_string *str; | |
767 | acpi_status status; | |
768 | ||
769 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
770 | &buffer); | |
771 | if (ACPI_FAILURE(status)) { | |
772 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
773 | return -ENODEV; | |
774 | } | |
775 | ||
776 | pss = buffer.pointer; | |
777 | if (!pss || | |
778 | pss->type != ACPI_TYPE_PACKAGE || | |
779 | pss->package.count != 14) { | |
780 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
781 | "Invalid _PMC data\n"); | |
782 | res = -EFAULT; | |
783 | goto end; | |
784 | } | |
785 | ||
786 | /* Grab all the integer data at once */ | |
787 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
788 | state.pointer = &resource->caps; | |
789 | ||
790 | status = acpi_extract_package(pss, &format, &state); | |
791 | if (ACPI_FAILURE(status)) { | |
792 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
793 | res = -EFAULT; | |
794 | goto end; | |
795 | } | |
796 | ||
797 | if (resource->caps.units) { | |
798 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
799 | "Unknown units %llu.\n", | |
800 | resource->caps.units); | |
801 | res = -EINVAL; | |
802 | goto end; | |
803 | } | |
804 | ||
805 | /* Grab the string data */ | |
806 | str = &resource->model_number; | |
807 | ||
808 | for (i = 11; i < 14; i++) { | |
809 | union acpi_object *element = &(pss->package.elements[i]); | |
810 | ||
811 | if (element->type != ACPI_TYPE_STRING) { | |
812 | res = -EINVAL; | |
813 | goto error; | |
814 | } | |
815 | ||
816 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
817 | GFP_KERNEL); | |
818 | if (!*str) { | |
819 | res = -ENOMEM; | |
820 | goto error; | |
821 | } | |
822 | ||
823 | strncpy(*str, element->string.pointer, element->string.length); | |
824 | str++; | |
825 | } | |
826 | ||
827 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
828 | goto end; | |
829 | error: | |
830 | str = &resource->model_number; | |
831 | for (i = 0; i < 3; i++, str++) | |
832 | kfree(*str); | |
833 | end: | |
834 | kfree(buffer.pointer); | |
835 | return res; | |
836 | } | |
837 | ||
838 | /* Handle ACPI event notifications */ | |
839 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
840 | { | |
841 | struct acpi_power_meter_resource *resource; | |
842 | int res; | |
843 | ||
844 | if (!device || !acpi_driver_data(device)) | |
845 | return; | |
846 | ||
847 | resource = acpi_driver_data(device); | |
848 | ||
849 | mutex_lock(&resource->lock); | |
850 | switch (event) { | |
851 | case METER_NOTIFY_CONFIG: | |
852 | free_capabilities(resource); | |
853 | res = read_capabilities(resource); | |
854 | if (res) | |
855 | break; | |
856 | ||
857 | remove_attrs(resource); | |
858 | setup_attrs(resource); | |
859 | break; | |
860 | case METER_NOTIFY_TRIP: | |
861 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
862 | update_meter(resource); | |
863 | break; | |
864 | case METER_NOTIFY_CAP: | |
865 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
866 | update_cap(resource); | |
867 | break; | |
868 | case METER_NOTIFY_INTERVAL: | |
869 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
870 | update_avg_interval(resource); | |
871 | break; | |
872 | case METER_NOTIFY_CAPPING: | |
873 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
874 | dev_info(&device->dev, "Capping in progress.\n"); | |
875 | break; | |
876 | default: | |
877 | BUG(); | |
878 | } | |
879 | mutex_unlock(&resource->lock); | |
880 | ||
881 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
882 | dev_name(&device->dev), event, 0); | |
883 | } | |
884 | ||
885 | static int acpi_power_meter_add(struct acpi_device *device) | |
886 | { | |
887 | int res; | |
888 | struct acpi_power_meter_resource *resource; | |
889 | ||
890 | if (!device) | |
891 | return -EINVAL; | |
892 | ||
893 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
894 | GFP_KERNEL); | |
895 | if (!resource) | |
896 | return -ENOMEM; | |
897 | ||
898 | resource->sensors_valid = 0; | |
899 | resource->acpi_dev = device; | |
900 | mutex_init(&resource->lock); | |
901 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
902 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
903 | device->driver_data = resource; | |
904 | ||
905 | free_capabilities(resource); | |
906 | res = read_capabilities(resource); | |
907 | if (res) | |
908 | goto exit_free; | |
909 | ||
910 | resource->trip[0] = resource->trip[1] = -1; | |
911 | ||
912 | res = setup_attrs(resource); | |
913 | if (res) | |
914 | goto exit_free; | |
915 | ||
916 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
917 | if (IS_ERR(resource->hwmon_dev)) { | |
918 | res = PTR_ERR(resource->hwmon_dev); | |
919 | goto exit_remove; | |
920 | } | |
921 | ||
922 | res = 0; | |
923 | goto exit; | |
924 | ||
925 | exit_remove: | |
926 | remove_attrs(resource); | |
927 | exit_free: | |
928 | kfree(resource); | |
929 | exit: | |
930 | return res; | |
931 | } | |
932 | ||
933 | static int acpi_power_meter_remove(struct acpi_device *device, int type) | |
934 | { | |
935 | struct acpi_power_meter_resource *resource; | |
936 | ||
937 | if (!device || !acpi_driver_data(device)) | |
938 | return -EINVAL; | |
939 | ||
940 | resource = acpi_driver_data(device); | |
941 | hwmon_device_unregister(resource->hwmon_dev); | |
942 | ||
943 | free_capabilities(resource); | |
944 | remove_attrs(resource); | |
945 | ||
946 | kfree(resource); | |
947 | return 0; | |
948 | } | |
949 | ||
950 | static int acpi_power_meter_resume(struct acpi_device *device) | |
951 | { | |
952 | struct acpi_power_meter_resource *resource; | |
953 | ||
954 | if (!device || !acpi_driver_data(device)) | |
955 | return -EINVAL; | |
956 | ||
957 | resource = acpi_driver_data(device); | |
958 | free_capabilities(resource); | |
959 | read_capabilities(resource); | |
960 | ||
961 | return 0; | |
962 | } | |
963 | ||
964 | static struct acpi_driver acpi_power_meter_driver = { | |
965 | .name = "power_meter", | |
966 | .class = ACPI_POWER_METER_CLASS, | |
967 | .ids = power_meter_ids, | |
968 | .ops = { | |
969 | .add = acpi_power_meter_add, | |
970 | .remove = acpi_power_meter_remove, | |
971 | .resume = acpi_power_meter_resume, | |
972 | .notify = acpi_power_meter_notify, | |
973 | }, | |
974 | }; | |
975 | ||
976 | /* Module init/exit routines */ | |
977 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
978 | { | |
979 | cap_in_hardware = 1; | |
980 | return 0; | |
981 | } | |
982 | ||
983 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
984 | { | |
985 | enable_cap_knobs, "IBM Active Energy Manager", | |
986 | { | |
987 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
988 | }, | |
989 | }, | |
990 | {} | |
991 | }; | |
992 | ||
993 | static int __init acpi_power_meter_init(void) | |
994 | { | |
995 | int result; | |
996 | ||
997 | if (acpi_disabled) | |
998 | return -ENODEV; | |
999 | ||
1000 | dmi_check_system(pm_dmi_table); | |
1001 | ||
1002 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
1003 | if (result < 0) | |
1004 | return -ENODEV; | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static void __exit acpi_power_meter_exit(void) | |
1010 | { | |
1011 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1012 | } | |
1013 | ||
1014 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
1015 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); | |
1016 | MODULE_LICENSE("GPL"); | |
1017 | ||
1018 | module_param(force_cap_on, bool, 0644); | |
1019 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1020 | ||
1021 | module_init(acpi_power_meter_init); | |
1022 | module_exit(acpi_power_meter_exit); |