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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 | ||
3c45f2c7 KM |
464 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
465 | { \ | |
466 | .label = _label, \ | |
467 | .show = _show, \ | |
468 | .index = _index, \ | |
469 | } | |
470 | ||
471 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
472 | { \ | |
473 | .label = _label, \ | |
474 | .show = _show, \ | |
475 | .set = _set, \ | |
476 | .index = _index, \ | |
477 | } | |
478 | ||
de584afa | 479 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 480 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
481 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
482 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
483 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
484 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
485 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 KM |
486 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
487 | set_avg_interval, 0), | |
81194cd2 | 488 | {}, |
de584afa DW |
489 | }; |
490 | ||
81194cd2 | 491 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
492 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
493 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
494 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
495 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 496 | {}, |
de584afa DW |
497 | }; |
498 | ||
81194cd2 | 499 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 500 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 501 | {}, |
de584afa DW |
502 | }; |
503 | ||
81194cd2 | 504 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 505 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 506 | {}, |
de584afa DW |
507 | }; |
508 | ||
81194cd2 | 509 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
510 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
511 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 512 | {}, |
de584afa DW |
513 | }; |
514 | ||
81194cd2 | 515 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
516 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
517 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
518 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
519 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 520 | {}, |
de584afa DW |
521 | }; |
522 | ||
3c45f2c7 KM |
523 | #undef RO_SENSOR_TEMPLATE |
524 | #undef RW_SENSOR_TEMPLATE | |
525 | ||
de584afa DW |
526 | /* Read power domain data */ |
527 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
528 | { | |
529 | int i; | |
530 | ||
531 | if (!resource->num_domain_devices) | |
532 | return; | |
533 | ||
534 | for (i = 0; i < resource->num_domain_devices; i++) { | |
535 | struct acpi_device *obj = resource->domain_devices[i]; | |
536 | if (!obj) | |
537 | continue; | |
538 | ||
539 | sysfs_remove_link(resource->holders_dir, | |
540 | kobject_name(&obj->dev.kobj)); | |
541 | put_device(&obj->dev); | |
542 | } | |
543 | ||
544 | kfree(resource->domain_devices); | |
545 | kobject_put(resource->holders_dir); | |
7f07a605 | 546 | resource->num_domain_devices = 0; |
de584afa DW |
547 | } |
548 | ||
549 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
550 | { | |
551 | int res = 0; | |
552 | int i; | |
553 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
554 | union acpi_object *pss; | |
555 | acpi_status status; | |
556 | ||
557 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
558 | &buffer); | |
559 | if (ACPI_FAILURE(status)) { | |
560 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
561 | return -ENODEV; | |
562 | } | |
563 | ||
564 | pss = buffer.pointer; | |
565 | if (!pss || | |
566 | pss->type != ACPI_TYPE_PACKAGE) { | |
567 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
568 | "Invalid _PMD data\n"); | |
569 | res = -EFAULT; | |
570 | goto end; | |
571 | } | |
572 | ||
573 | if (!pss->package.count) | |
574 | goto end; | |
575 | ||
576 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
577 | pss->package.count, GFP_KERNEL); | |
578 | if (!resource->domain_devices) { | |
579 | res = -ENOMEM; | |
580 | goto end; | |
581 | } | |
582 | ||
583 | resource->holders_dir = kobject_create_and_add("measures", | |
584 | &resource->acpi_dev->dev.kobj); | |
585 | if (!resource->holders_dir) { | |
586 | res = -ENOMEM; | |
587 | goto exit_free; | |
588 | } | |
589 | ||
590 | resource->num_domain_devices = pss->package.count; | |
591 | ||
592 | for (i = 0; i < pss->package.count; i++) { | |
593 | struct acpi_device *obj; | |
594 | union acpi_object *element = &(pss->package.elements[i]); | |
595 | ||
596 | /* Refuse non-references */ | |
597 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
598 | continue; | |
599 | ||
600 | /* Create a symlink to domain objects */ | |
601 | resource->domain_devices[i] = NULL; | |
602 | status = acpi_bus_get_device(element->reference.handle, | |
603 | &resource->domain_devices[i]); | |
604 | if (ACPI_FAILURE(status)) | |
605 | continue; | |
606 | ||
607 | obj = resource->domain_devices[i]; | |
608 | get_device(&obj->dev); | |
609 | ||
610 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
611 | kobject_name(&obj->dev.kobj)); | |
612 | if (res) { | |
613 | put_device(&obj->dev); | |
614 | resource->domain_devices[i] = NULL; | |
615 | } | |
616 | } | |
617 | ||
618 | res = 0; | |
619 | goto end; | |
620 | ||
621 | exit_free: | |
622 | kfree(resource->domain_devices); | |
623 | end: | |
624 | kfree(buffer.pointer); | |
625 | return res; | |
626 | } | |
627 | ||
628 | /* Registration and deregistration */ | |
f49d6a7e KM |
629 | static int register_attrs(struct acpi_power_meter_resource *resource, |
630 | struct sensor_template *attrs) | |
de584afa DW |
631 | { |
632 | struct device *dev = &resource->acpi_dev->dev; | |
633 | struct sensor_device_attribute *sensors = | |
634 | &resource->sensors[resource->num_sensors]; | |
635 | int res = 0; | |
636 | ||
f49d6a7e KM |
637 | while (attrs->label) { |
638 | sensors->dev_attr.attr.name = attrs->label; | |
de584afa | 639 | sensors->dev_attr.attr.mode = S_IRUGO; |
f49d6a7e KM |
640 | sensors->dev_attr.show = attrs->show; |
641 | sensors->index = attrs->index; | |
de584afa | 642 | |
f49d6a7e KM |
643 | if (attrs->set) { |
644 | sensors->dev_attr.attr.mode |= S_IWUSR; | |
645 | sensors->dev_attr.store = attrs->set; | |
de584afa | 646 | } |
de584afa | 647 | |
31e354ee | 648 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
649 | res = device_create_file(dev, &sensors->dev_attr); |
650 | if (res) { | |
651 | sensors->dev_attr.attr.name = NULL; | |
652 | goto error; | |
653 | } | |
654 | sensors++; | |
655 | resource->num_sensors++; | |
f49d6a7e | 656 | attrs++; |
de584afa DW |
657 | } |
658 | ||
659 | error: | |
660 | return res; | |
661 | } | |
662 | ||
663 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
664 | { | |
665 | int i; | |
666 | ||
667 | for (i = 0; i < resource->num_sensors; i++) { | |
668 | if (!resource->sensors[i].dev_attr.attr.name) | |
669 | continue; | |
670 | device_remove_file(&resource->acpi_dev->dev, | |
671 | &resource->sensors[i].dev_attr); | |
672 | } | |
673 | ||
674 | remove_domain_devices(resource); | |
675 | ||
676 | resource->num_sensors = 0; | |
677 | } | |
678 | ||
679 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
680 | { | |
681 | int res = 0; | |
682 | ||
683 | res = read_domain_devices(resource); | |
684 | if (res) | |
685 | return res; | |
686 | ||
687 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 688 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
689 | if (res) |
690 | goto error; | |
691 | } | |
692 | ||
693 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
694 | if (!can_cap_in_hardware()) { | |
695 | dev_err(&resource->acpi_dev->dev, | |
696 | "Ignoring unsafe software power cap!\n"); | |
697 | goto skip_unsafe_cap; | |
698 | } | |
699 | ||
7bb5ee01 | 700 | if (resource->caps.configurable_cap) |
f49d6a7e | 701 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 702 | else |
f49d6a7e | 703 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
704 | |
705 | if (res) | |
706 | goto error; | |
707 | ||
f49d6a7e | 708 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
709 | if (res) |
710 | goto error; | |
711 | } | |
de584afa | 712 | |
7bb5ee01 | 713 | skip_unsafe_cap: |
de584afa | 714 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 715 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
716 | if (res) |
717 | goto error; | |
718 | } | |
719 | ||
f49d6a7e | 720 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
721 | if (res) |
722 | goto error; | |
723 | ||
724 | return res; | |
725 | error: | |
de584afa DW |
726 | remove_attrs(resource); |
727 | return res; | |
728 | } | |
729 | ||
730 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
731 | { | |
732 | acpi_string *str; | |
733 | int i; | |
734 | ||
735 | str = &resource->model_number; | |
736 | for (i = 0; i < 3; i++, str++) | |
737 | kfree(*str); | |
738 | } | |
739 | ||
740 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
741 | { | |
742 | int res = 0; | |
743 | int i; | |
744 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
745 | struct acpi_buffer state = { 0, NULL }; | |
746 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
747 | union acpi_object *pss; | |
748 | acpi_string *str; | |
749 | acpi_status status; | |
750 | ||
751 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
752 | &buffer); | |
753 | if (ACPI_FAILURE(status)) { | |
754 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
755 | return -ENODEV; | |
756 | } | |
757 | ||
758 | pss = buffer.pointer; | |
759 | if (!pss || | |
760 | pss->type != ACPI_TYPE_PACKAGE || | |
761 | pss->package.count != 14) { | |
762 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
763 | "Invalid _PMC data\n"); | |
764 | res = -EFAULT; | |
765 | goto end; | |
766 | } | |
767 | ||
768 | /* Grab all the integer data at once */ | |
769 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
770 | state.pointer = &resource->caps; | |
771 | ||
772 | status = acpi_extract_package(pss, &format, &state); | |
773 | if (ACPI_FAILURE(status)) { | |
774 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
775 | res = -EFAULT; | |
776 | goto end; | |
777 | } | |
778 | ||
779 | if (resource->caps.units) { | |
780 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
781 | "Unknown units %llu.\n", | |
782 | resource->caps.units); | |
783 | res = -EINVAL; | |
784 | goto end; | |
785 | } | |
786 | ||
787 | /* Grab the string data */ | |
788 | str = &resource->model_number; | |
789 | ||
790 | for (i = 11; i < 14; i++) { | |
791 | union acpi_object *element = &(pss->package.elements[i]); | |
792 | ||
793 | if (element->type != ACPI_TYPE_STRING) { | |
794 | res = -EINVAL; | |
795 | goto error; | |
796 | } | |
797 | ||
798 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
799 | GFP_KERNEL); | |
800 | if (!*str) { | |
801 | res = -ENOMEM; | |
802 | goto error; | |
803 | } | |
804 | ||
805 | strncpy(*str, element->string.pointer, element->string.length); | |
806 | str++; | |
807 | } | |
808 | ||
809 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
810 | goto end; | |
811 | error: | |
812 | str = &resource->model_number; | |
813 | for (i = 0; i < 3; i++, str++) | |
814 | kfree(*str); | |
815 | end: | |
816 | kfree(buffer.pointer); | |
817 | return res; | |
818 | } | |
819 | ||
820 | /* Handle ACPI event notifications */ | |
821 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
822 | { | |
823 | struct acpi_power_meter_resource *resource; | |
824 | int res; | |
825 | ||
826 | if (!device || !acpi_driver_data(device)) | |
827 | return; | |
828 | ||
829 | resource = acpi_driver_data(device); | |
830 | ||
831 | mutex_lock(&resource->lock); | |
832 | switch (event) { | |
833 | case METER_NOTIFY_CONFIG: | |
834 | free_capabilities(resource); | |
835 | res = read_capabilities(resource); | |
836 | if (res) | |
837 | break; | |
838 | ||
839 | remove_attrs(resource); | |
840 | setup_attrs(resource); | |
841 | break; | |
842 | case METER_NOTIFY_TRIP: | |
843 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
844 | update_meter(resource); | |
845 | break; | |
846 | case METER_NOTIFY_CAP: | |
847 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
848 | update_cap(resource); | |
849 | break; | |
850 | case METER_NOTIFY_INTERVAL: | |
851 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
852 | update_avg_interval(resource); | |
853 | break; | |
854 | case METER_NOTIFY_CAPPING: | |
855 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
856 | dev_info(&device->dev, "Capping in progress.\n"); | |
857 | break; | |
858 | default: | |
859 | BUG(); | |
860 | } | |
861 | mutex_unlock(&resource->lock); | |
862 | ||
863 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
864 | dev_name(&device->dev), event, 0); | |
865 | } | |
866 | ||
867 | static int acpi_power_meter_add(struct acpi_device *device) | |
868 | { | |
869 | int res; | |
870 | struct acpi_power_meter_resource *resource; | |
871 | ||
872 | if (!device) | |
873 | return -EINVAL; | |
874 | ||
875 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
876 | GFP_KERNEL); | |
877 | if (!resource) | |
878 | return -ENOMEM; | |
879 | ||
880 | resource->sensors_valid = 0; | |
881 | resource->acpi_dev = device; | |
882 | mutex_init(&resource->lock); | |
883 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
884 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
885 | device->driver_data = resource; | |
886 | ||
887 | free_capabilities(resource); | |
888 | res = read_capabilities(resource); | |
889 | if (res) | |
890 | goto exit_free; | |
891 | ||
892 | resource->trip[0] = resource->trip[1] = -1; | |
893 | ||
894 | res = setup_attrs(resource); | |
895 | if (res) | |
896 | goto exit_free; | |
897 | ||
898 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
899 | if (IS_ERR(resource->hwmon_dev)) { | |
900 | res = PTR_ERR(resource->hwmon_dev); | |
901 | goto exit_remove; | |
902 | } | |
903 | ||
904 | res = 0; | |
905 | goto exit; | |
906 | ||
907 | exit_remove: | |
908 | remove_attrs(resource); | |
909 | exit_free: | |
910 | kfree(resource); | |
911 | exit: | |
912 | return res; | |
913 | } | |
914 | ||
915 | static int acpi_power_meter_remove(struct acpi_device *device, int type) | |
916 | { | |
917 | struct acpi_power_meter_resource *resource; | |
918 | ||
919 | if (!device || !acpi_driver_data(device)) | |
920 | return -EINVAL; | |
921 | ||
922 | resource = acpi_driver_data(device); | |
923 | hwmon_device_unregister(resource->hwmon_dev); | |
924 | ||
925 | free_capabilities(resource); | |
926 | remove_attrs(resource); | |
927 | ||
928 | kfree(resource); | |
929 | return 0; | |
930 | } | |
931 | ||
932 | static int acpi_power_meter_resume(struct acpi_device *device) | |
933 | { | |
934 | struct acpi_power_meter_resource *resource; | |
935 | ||
936 | if (!device || !acpi_driver_data(device)) | |
937 | return -EINVAL; | |
938 | ||
939 | resource = acpi_driver_data(device); | |
940 | free_capabilities(resource); | |
941 | read_capabilities(resource); | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | static struct acpi_driver acpi_power_meter_driver = { | |
947 | .name = "power_meter", | |
948 | .class = ACPI_POWER_METER_CLASS, | |
949 | .ids = power_meter_ids, | |
950 | .ops = { | |
951 | .add = acpi_power_meter_add, | |
952 | .remove = acpi_power_meter_remove, | |
953 | .resume = acpi_power_meter_resume, | |
954 | .notify = acpi_power_meter_notify, | |
955 | }, | |
956 | }; | |
957 | ||
958 | /* Module init/exit routines */ | |
959 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
960 | { | |
961 | cap_in_hardware = 1; | |
962 | return 0; | |
963 | } | |
964 | ||
965 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
966 | { | |
967 | enable_cap_knobs, "IBM Active Energy Manager", | |
968 | { | |
969 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
970 | }, | |
971 | }, | |
972 | {} | |
973 | }; | |
974 | ||
975 | static int __init acpi_power_meter_init(void) | |
976 | { | |
977 | int result; | |
978 | ||
979 | if (acpi_disabled) | |
980 | return -ENODEV; | |
981 | ||
982 | dmi_check_system(pm_dmi_table); | |
983 | ||
984 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
985 | if (result < 0) | |
986 | return -ENODEV; | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
991 | static void __exit acpi_power_meter_exit(void) | |
992 | { | |
993 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
994 | } | |
995 | ||
996 | MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); | |
997 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); | |
998 | MODULE_LICENSE("GPL"); | |
999 | ||
1000 | module_param(force_cap_on, bool, 0644); | |
1001 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1002 | ||
1003 | module_init(acpi_power_meter_init); | |
1004 | module_exit(acpi_power_meter_exit); |