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de584afa DW |
1 | /* |
2 | * A hwmon driver for ACPI 4.0 power meters | |
3 | * Copyright (C) 2009 IBM | |
4 | * | |
5407e051 | 5 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
de584afa DW |
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> | |
fa845740 | 32 | #include <linux/err.h> |
de584afa DW |
33 | #include <acpi/acpi_drivers.h> |
34 | #include <acpi/acpi_bus.h> | |
35 | ||
36 | #define ACPI_POWER_METER_NAME "power_meter" | |
37 | ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); | |
38 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" | |
18262714 | 39 | #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
de584afa DW |
40 | |
41 | #define NUM_SENSORS 17 | |
42 | ||
43 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
44 | #define POWER_METER_CAN_TRIP (1 << 1) | |
45 | #define POWER_METER_CAN_CAP (1 << 2) | |
46 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
47 | #define POWER_METER_IS_BATTERY (1 << 8) | |
48 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
49 | ||
50 | #define METER_NOTIFY_CONFIG 0x80 | |
51 | #define METER_NOTIFY_TRIP 0x81 | |
52 | #define METER_NOTIFY_CAP 0x82 | |
53 | #define METER_NOTIFY_CAPPING 0x83 | |
54 | #define METER_NOTIFY_INTERVAL 0x84 | |
55 | ||
56 | #define POWER_AVERAGE_NAME "power1_average" | |
57 | #define POWER_CAP_NAME "power1_cap" | |
58 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
59 | #define POWER_ALARM_NAME "power1_alarm" | |
60 | ||
61 | static int cap_in_hardware; | |
90ab5ee9 | 62 | static bool force_cap_on; |
de584afa DW |
63 | |
64 | static int can_cap_in_hardware(void) | |
65 | { | |
66 | return force_cap_on || cap_in_hardware; | |
67 | } | |
68 | ||
c97adf9e | 69 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
70 | {"ACPI000D", 0}, |
71 | {"", 0}, | |
72 | }; | |
73 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
74 | ||
75 | struct acpi_power_meter_capabilities { | |
439913ff LM |
76 | u64 flags; |
77 | u64 units; | |
78 | u64 type; | |
79 | u64 accuracy; | |
80 | u64 sampling_time; | |
81 | u64 min_avg_interval; | |
82 | u64 max_avg_interval; | |
83 | u64 hysteresis; | |
84 | u64 configurable_cap; | |
85 | u64 min_cap; | |
86 | u64 max_cap; | |
de584afa DW |
87 | }; |
88 | ||
89 | struct acpi_power_meter_resource { | |
90 | struct acpi_device *acpi_dev; | |
91 | acpi_bus_id name; | |
92 | struct mutex lock; | |
93 | struct device *hwmon_dev; | |
94 | struct acpi_power_meter_capabilities caps; | |
95 | acpi_string model_number; | |
96 | acpi_string serial_number; | |
97 | acpi_string oem_info; | |
439913ff LM |
98 | u64 power; |
99 | u64 cap; | |
100 | u64 avg_interval; | |
de584afa DW |
101 | int sensors_valid; |
102 | unsigned long sensors_last_updated; | |
103 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
104 | int num_sensors; | |
75311bea | 105 | s64 trip[2]; |
de584afa DW |
106 | int num_domain_devices; |
107 | struct acpi_device **domain_devices; | |
108 | struct kobject *holders_dir; | |
109 | }; | |
110 | ||
81194cd2 | 111 | struct sensor_template { |
de584afa DW |
112 | char *label; |
113 | ssize_t (*show)(struct device *dev, | |
114 | struct device_attribute *devattr, | |
115 | char *buf); | |
116 | ssize_t (*set)(struct device *dev, | |
117 | struct device_attribute *devattr, | |
118 | const char *buf, size_t count); | |
119 | int index; | |
120 | }; | |
121 | ||
122 | /* Averaging interval */ | |
123 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
124 | { | |
125 | unsigned long long data; | |
126 | acpi_status status; | |
127 | ||
128 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
129 | NULL, &data); | |
130 | if (ACPI_FAILURE(status)) { | |
131 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
132 | return -ENODEV; | |
133 | } | |
134 | ||
135 | resource->avg_interval = data; | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static ssize_t show_avg_interval(struct device *dev, | |
140 | struct device_attribute *devattr, | |
141 | char *buf) | |
142 | { | |
143 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
144 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
145 | ||
146 | mutex_lock(&resource->lock); | |
147 | update_avg_interval(resource); | |
148 | mutex_unlock(&resource->lock); | |
149 | ||
150 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
151 | } | |
152 | ||
153 | static ssize_t set_avg_interval(struct device *dev, | |
154 | struct device_attribute *devattr, | |
155 | const char *buf, size_t count) | |
156 | { | |
157 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
158 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
159 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
160 | struct acpi_object_list args = { 1, &arg0 }; | |
161 | int res; | |
162 | unsigned long temp; | |
163 | unsigned long long data; | |
164 | acpi_status status; | |
165 | ||
179c4fdb | 166 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
167 | if (res) |
168 | return res; | |
169 | ||
170 | if (temp > resource->caps.max_avg_interval || | |
171 | temp < resource->caps.min_avg_interval) | |
172 | return -EINVAL; | |
173 | arg0.integer.value = temp; | |
174 | ||
175 | mutex_lock(&resource->lock); | |
176 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
177 | &args, &data); | |
178 | if (!ACPI_FAILURE(status)) | |
179 | resource->avg_interval = temp; | |
180 | mutex_unlock(&resource->lock); | |
181 | ||
182 | if (ACPI_FAILURE(status)) { | |
183 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | /* _PAI returns 0 on success, nonzero otherwise */ | |
188 | if (data) | |
189 | return -EINVAL; | |
190 | ||
191 | return count; | |
192 | } | |
193 | ||
194 | /* Cap functions */ | |
195 | static int update_cap(struct acpi_power_meter_resource *resource) | |
196 | { | |
197 | unsigned long long data; | |
198 | acpi_status status; | |
199 | ||
200 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
201 | NULL, &data); | |
202 | if (ACPI_FAILURE(status)) { | |
203 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
204 | return -ENODEV; | |
205 | } | |
206 | ||
207 | resource->cap = data; | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static ssize_t show_cap(struct device *dev, | |
212 | struct device_attribute *devattr, | |
213 | char *buf) | |
214 | { | |
215 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
216 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
217 | ||
218 | mutex_lock(&resource->lock); | |
219 | update_cap(resource); | |
220 | mutex_unlock(&resource->lock); | |
221 | ||
222 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
223 | } | |
224 | ||
225 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
226 | const char *buf, size_t count) | |
227 | { | |
228 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
229 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
230 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
231 | struct acpi_object_list args = { 1, &arg0 }; | |
232 | int res; | |
233 | unsigned long temp; | |
234 | unsigned long long data; | |
235 | acpi_status status; | |
236 | ||
179c4fdb | 237 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
238 | if (res) |
239 | return res; | |
240 | ||
27c4db39 | 241 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
242 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
243 | return -EINVAL; | |
244 | arg0.integer.value = temp; | |
245 | ||
246 | mutex_lock(&resource->lock); | |
247 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
248 | &args, &data); | |
249 | if (!ACPI_FAILURE(status)) | |
250 | resource->cap = temp; | |
251 | mutex_unlock(&resource->lock); | |
252 | ||
253 | if (ACPI_FAILURE(status)) { | |
254 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | /* _SHL returns 0 on success, nonzero otherwise */ | |
259 | if (data) | |
260 | return -EINVAL; | |
261 | ||
262 | return count; | |
263 | } | |
264 | ||
265 | /* Power meter trip points */ | |
266 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
267 | { | |
268 | union acpi_object arg_objs[] = { | |
269 | {ACPI_TYPE_INTEGER}, | |
270 | {ACPI_TYPE_INTEGER} | |
271 | }; | |
272 | struct acpi_object_list args = { 2, arg_objs }; | |
273 | unsigned long long data; | |
274 | acpi_status status; | |
275 | ||
276 | /* Both trip levels must be set */ | |
277 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
278 | return 0; | |
279 | ||
280 | /* This driver stores min, max; ACPI wants max, min. */ | |
281 | arg_objs[0].integer.value = resource->trip[1]; | |
282 | arg_objs[1].integer.value = resource->trip[0]; | |
283 | ||
284 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
285 | &args, &data); | |
286 | if (ACPI_FAILURE(status)) { | |
287 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
22aecebf DW |
291 | /* _PTP returns 0 on success, nonzero otherwise */ |
292 | if (data) | |
293 | return -EINVAL; | |
294 | ||
295 | return 0; | |
de584afa DW |
296 | } |
297 | ||
298 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
299 | const char *buf, size_t count) | |
300 | { | |
301 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
302 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
303 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
304 | int res; | |
305 | unsigned long temp; | |
306 | ||
179c4fdb | 307 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
308 | if (res) |
309 | return res; | |
310 | ||
27c4db39 | 311 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
312 | |
313 | mutex_lock(&resource->lock); | |
314 | resource->trip[attr->index - 7] = temp; | |
315 | res = set_acpi_trip(resource); | |
316 | mutex_unlock(&resource->lock); | |
317 | ||
318 | if (res) | |
319 | return res; | |
320 | ||
321 | return count; | |
322 | } | |
323 | ||
324 | /* Power meter */ | |
325 | static int update_meter(struct acpi_power_meter_resource *resource) | |
326 | { | |
327 | unsigned long long data; | |
328 | acpi_status status; | |
329 | unsigned long local_jiffies = jiffies; | |
330 | ||
331 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
332 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
333 | resource->sensors_valid) | |
334 | return 0; | |
335 | ||
336 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
337 | NULL, &data); | |
338 | if (ACPI_FAILURE(status)) { | |
339 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
340 | return -ENODEV; | |
341 | } | |
342 | ||
343 | resource->power = data; | |
344 | resource->sensors_valid = 1; | |
345 | resource->sensors_last_updated = jiffies; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static ssize_t show_power(struct device *dev, | |
350 | struct device_attribute *devattr, | |
351 | char *buf) | |
352 | { | |
353 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
354 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
355 | ||
356 | mutex_lock(&resource->lock); | |
357 | update_meter(resource); | |
358 | mutex_unlock(&resource->lock); | |
359 | ||
360 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
361 | } | |
362 | ||
363 | /* Miscellaneous */ | |
364 | static ssize_t show_str(struct device *dev, | |
365 | struct device_attribute *devattr, | |
366 | char *buf) | |
367 | { | |
368 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
369 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
370 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
371 | acpi_string val; | |
372 | ||
373 | switch (attr->index) { | |
374 | case 0: | |
375 | val = resource->model_number; | |
376 | break; | |
377 | case 1: | |
378 | val = resource->serial_number; | |
379 | break; | |
380 | case 2: | |
381 | val = resource->oem_info; | |
382 | break; | |
383 | default: | |
384 | BUG(); | |
776cdc11 | 385 | val = ""; |
de584afa DW |
386 | } |
387 | ||
388 | return sprintf(buf, "%s\n", val); | |
389 | } | |
390 | ||
391 | static ssize_t show_val(struct device *dev, | |
392 | struct device_attribute *devattr, | |
393 | char *buf) | |
394 | { | |
395 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
396 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
397 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 398 | u64 val = 0; |
de584afa DW |
399 | |
400 | switch (attr->index) { | |
401 | case 0: | |
402 | val = resource->caps.min_avg_interval; | |
403 | break; | |
404 | case 1: | |
405 | val = resource->caps.max_avg_interval; | |
406 | break; | |
407 | case 2: | |
408 | val = resource->caps.min_cap * 1000; | |
409 | break; | |
410 | case 3: | |
411 | val = resource->caps.max_cap * 1000; | |
412 | break; | |
413 | case 4: | |
414 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
415 | return sprintf(buf, "unknown\n"); | |
416 | ||
417 | val = resource->caps.hysteresis * 1000; | |
418 | break; | |
419 | case 5: | |
420 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
421 | val = 1; | |
422 | else | |
423 | val = 0; | |
424 | break; | |
425 | case 6: | |
426 | if (resource->power > resource->cap) | |
427 | val = 1; | |
428 | else | |
429 | val = 0; | |
430 | break; | |
431 | case 7: | |
432 | case 8: | |
433 | if (resource->trip[attr->index - 7] < 0) | |
434 | return sprintf(buf, "unknown\n"); | |
435 | ||
436 | val = resource->trip[attr->index - 7] * 1000; | |
437 | break; | |
438 | default: | |
439 | BUG(); | |
440 | } | |
441 | ||
442 | return sprintf(buf, "%llu\n", val); | |
443 | } | |
444 | ||
445 | static ssize_t show_accuracy(struct device *dev, | |
446 | struct device_attribute *devattr, | |
447 | char *buf) | |
448 | { | |
449 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
450 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
451 | unsigned int acc = resource->caps.accuracy; | |
452 | ||
453 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
454 | } | |
455 | ||
456 | static ssize_t show_name(struct device *dev, | |
457 | struct device_attribute *devattr, | |
458 | char *buf) | |
459 | { | |
460 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
461 | } | |
462 | ||
3c45f2c7 KM |
463 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
464 | { \ | |
465 | .label = _label, \ | |
466 | .show = _show, \ | |
467 | .index = _index, \ | |
468 | } | |
469 | ||
470 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
471 | { \ | |
472 | .label = _label, \ | |
473 | .show = _show, \ | |
474 | .set = _set, \ | |
475 | .index = _index, \ | |
476 | } | |
477 | ||
de584afa | 478 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 479 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
480 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
481 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
482 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
483 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
484 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 KM |
485 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
486 | set_avg_interval, 0), | |
81194cd2 | 487 | {}, |
de584afa DW |
488 | }; |
489 | ||
81194cd2 | 490 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
491 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
492 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
493 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
494 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 495 | {}, |
de584afa DW |
496 | }; |
497 | ||
81194cd2 | 498 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 499 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 500 | {}, |
de584afa DW |
501 | }; |
502 | ||
81194cd2 | 503 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 504 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 505 | {}, |
de584afa DW |
506 | }; |
507 | ||
81194cd2 | 508 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
509 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
510 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 511 | {}, |
de584afa DW |
512 | }; |
513 | ||
81194cd2 | 514 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
515 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
516 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
517 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
518 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 519 | {}, |
de584afa DW |
520 | }; |
521 | ||
3c45f2c7 KM |
522 | #undef RO_SENSOR_TEMPLATE |
523 | #undef RW_SENSOR_TEMPLATE | |
524 | ||
de584afa DW |
525 | /* Read power domain data */ |
526 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
527 | { | |
528 | int i; | |
529 | ||
530 | if (!resource->num_domain_devices) | |
531 | return; | |
532 | ||
533 | for (i = 0; i < resource->num_domain_devices; i++) { | |
534 | struct acpi_device *obj = resource->domain_devices[i]; | |
535 | if (!obj) | |
536 | continue; | |
537 | ||
538 | sysfs_remove_link(resource->holders_dir, | |
539 | kobject_name(&obj->dev.kobj)); | |
540 | put_device(&obj->dev); | |
541 | } | |
542 | ||
543 | kfree(resource->domain_devices); | |
544 | kobject_put(resource->holders_dir); | |
7f07a605 | 545 | resource->num_domain_devices = 0; |
de584afa DW |
546 | } |
547 | ||
548 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
549 | { | |
550 | int res = 0; | |
551 | int i; | |
552 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
553 | union acpi_object *pss; | |
554 | acpi_status status; | |
555 | ||
556 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
557 | &buffer); | |
558 | if (ACPI_FAILURE(status)) { | |
559 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
560 | return -ENODEV; | |
561 | } | |
562 | ||
563 | pss = buffer.pointer; | |
564 | if (!pss || | |
565 | pss->type != ACPI_TYPE_PACKAGE) { | |
566 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
567 | "Invalid _PMD data\n"); | |
568 | res = -EFAULT; | |
569 | goto end; | |
570 | } | |
571 | ||
572 | if (!pss->package.count) | |
573 | goto end; | |
574 | ||
575 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
576 | pss->package.count, GFP_KERNEL); | |
577 | if (!resource->domain_devices) { | |
578 | res = -ENOMEM; | |
579 | goto end; | |
580 | } | |
581 | ||
582 | resource->holders_dir = kobject_create_and_add("measures", | |
583 | &resource->acpi_dev->dev.kobj); | |
584 | if (!resource->holders_dir) { | |
585 | res = -ENOMEM; | |
586 | goto exit_free; | |
587 | } | |
588 | ||
589 | resource->num_domain_devices = pss->package.count; | |
590 | ||
591 | for (i = 0; i < pss->package.count; i++) { | |
592 | struct acpi_device *obj; | |
593 | union acpi_object *element = &(pss->package.elements[i]); | |
594 | ||
595 | /* Refuse non-references */ | |
596 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
597 | continue; | |
598 | ||
599 | /* Create a symlink to domain objects */ | |
600 | resource->domain_devices[i] = NULL; | |
601 | status = acpi_bus_get_device(element->reference.handle, | |
602 | &resource->domain_devices[i]); | |
603 | if (ACPI_FAILURE(status)) | |
604 | continue; | |
605 | ||
606 | obj = resource->domain_devices[i]; | |
607 | get_device(&obj->dev); | |
608 | ||
609 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
610 | kobject_name(&obj->dev.kobj)); | |
611 | if (res) { | |
612 | put_device(&obj->dev); | |
613 | resource->domain_devices[i] = NULL; | |
614 | } | |
615 | } | |
616 | ||
617 | res = 0; | |
618 | goto end; | |
619 | ||
620 | exit_free: | |
621 | kfree(resource->domain_devices); | |
622 | end: | |
623 | kfree(buffer.pointer); | |
624 | return res; | |
625 | } | |
626 | ||
627 | /* Registration and deregistration */ | |
f49d6a7e KM |
628 | static int register_attrs(struct acpi_power_meter_resource *resource, |
629 | struct sensor_template *attrs) | |
de584afa DW |
630 | { |
631 | struct device *dev = &resource->acpi_dev->dev; | |
632 | struct sensor_device_attribute *sensors = | |
633 | &resource->sensors[resource->num_sensors]; | |
634 | int res = 0; | |
635 | ||
f49d6a7e KM |
636 | while (attrs->label) { |
637 | sensors->dev_attr.attr.name = attrs->label; | |
de584afa | 638 | sensors->dev_attr.attr.mode = S_IRUGO; |
f49d6a7e KM |
639 | sensors->dev_attr.show = attrs->show; |
640 | sensors->index = attrs->index; | |
de584afa | 641 | |
f49d6a7e KM |
642 | if (attrs->set) { |
643 | sensors->dev_attr.attr.mode |= S_IWUSR; | |
644 | sensors->dev_attr.store = attrs->set; | |
de584afa | 645 | } |
de584afa | 646 | |
31e354ee | 647 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
648 | res = device_create_file(dev, &sensors->dev_attr); |
649 | if (res) { | |
650 | sensors->dev_attr.attr.name = NULL; | |
651 | goto error; | |
652 | } | |
653 | sensors++; | |
654 | resource->num_sensors++; | |
f49d6a7e | 655 | attrs++; |
de584afa DW |
656 | } |
657 | ||
658 | error: | |
659 | return res; | |
660 | } | |
661 | ||
662 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
663 | { | |
664 | int i; | |
665 | ||
666 | for (i = 0; i < resource->num_sensors; i++) { | |
667 | if (!resource->sensors[i].dev_attr.attr.name) | |
668 | continue; | |
669 | device_remove_file(&resource->acpi_dev->dev, | |
670 | &resource->sensors[i].dev_attr); | |
671 | } | |
672 | ||
673 | remove_domain_devices(resource); | |
674 | ||
675 | resource->num_sensors = 0; | |
676 | } | |
677 | ||
678 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
679 | { | |
680 | int res = 0; | |
681 | ||
682 | res = read_domain_devices(resource); | |
683 | if (res) | |
684 | return res; | |
685 | ||
686 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 687 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
688 | if (res) |
689 | goto error; | |
690 | } | |
691 | ||
692 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
693 | if (!can_cap_in_hardware()) { | |
694 | dev_err(&resource->acpi_dev->dev, | |
695 | "Ignoring unsafe software power cap!\n"); | |
696 | goto skip_unsafe_cap; | |
697 | } | |
698 | ||
7bb5ee01 | 699 | if (resource->caps.configurable_cap) |
f49d6a7e | 700 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 701 | else |
f49d6a7e | 702 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
703 | |
704 | if (res) | |
705 | goto error; | |
706 | ||
f49d6a7e | 707 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
708 | if (res) |
709 | goto error; | |
710 | } | |
de584afa | 711 | |
7bb5ee01 | 712 | skip_unsafe_cap: |
de584afa | 713 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 714 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
715 | if (res) |
716 | goto error; | |
717 | } | |
718 | ||
f49d6a7e | 719 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
720 | if (res) |
721 | goto error; | |
722 | ||
723 | return res; | |
724 | error: | |
de584afa DW |
725 | remove_attrs(resource); |
726 | return res; | |
727 | } | |
728 | ||
729 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
730 | { | |
731 | acpi_string *str; | |
732 | int i; | |
733 | ||
734 | str = &resource->model_number; | |
735 | for (i = 0; i < 3; i++, str++) | |
736 | kfree(*str); | |
737 | } | |
738 | ||
739 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
740 | { | |
741 | int res = 0; | |
742 | int i; | |
743 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
744 | struct acpi_buffer state = { 0, NULL }; | |
745 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
746 | union acpi_object *pss; | |
747 | acpi_string *str; | |
748 | acpi_status status; | |
749 | ||
750 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
751 | &buffer); | |
752 | if (ACPI_FAILURE(status)) { | |
753 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
754 | return -ENODEV; | |
755 | } | |
756 | ||
757 | pss = buffer.pointer; | |
758 | if (!pss || | |
759 | pss->type != ACPI_TYPE_PACKAGE || | |
760 | pss->package.count != 14) { | |
761 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
762 | "Invalid _PMC data\n"); | |
763 | res = -EFAULT; | |
764 | goto end; | |
765 | } | |
766 | ||
767 | /* Grab all the integer data at once */ | |
768 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
769 | state.pointer = &resource->caps; | |
770 | ||
771 | status = acpi_extract_package(pss, &format, &state); | |
772 | if (ACPI_FAILURE(status)) { | |
773 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
774 | res = -EFAULT; | |
775 | goto end; | |
776 | } | |
777 | ||
778 | if (resource->caps.units) { | |
779 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
780 | "Unknown units %llu.\n", | |
781 | resource->caps.units); | |
782 | res = -EINVAL; | |
783 | goto end; | |
784 | } | |
785 | ||
786 | /* Grab the string data */ | |
787 | str = &resource->model_number; | |
788 | ||
789 | for (i = 11; i < 14; i++) { | |
790 | union acpi_object *element = &(pss->package.elements[i]); | |
791 | ||
792 | if (element->type != ACPI_TYPE_STRING) { | |
793 | res = -EINVAL; | |
794 | goto error; | |
795 | } | |
796 | ||
797 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
798 | GFP_KERNEL); | |
799 | if (!*str) { | |
800 | res = -ENOMEM; | |
801 | goto error; | |
802 | } | |
803 | ||
804 | strncpy(*str, element->string.pointer, element->string.length); | |
805 | str++; | |
806 | } | |
807 | ||
808 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
809 | goto end; | |
810 | error: | |
811 | str = &resource->model_number; | |
812 | for (i = 0; i < 3; i++, str++) | |
813 | kfree(*str); | |
814 | end: | |
815 | kfree(buffer.pointer); | |
816 | return res; | |
817 | } | |
818 | ||
819 | /* Handle ACPI event notifications */ | |
820 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
821 | { | |
822 | struct acpi_power_meter_resource *resource; | |
823 | int res; | |
824 | ||
825 | if (!device || !acpi_driver_data(device)) | |
826 | return; | |
827 | ||
828 | resource = acpi_driver_data(device); | |
829 | ||
830 | mutex_lock(&resource->lock); | |
831 | switch (event) { | |
832 | case METER_NOTIFY_CONFIG: | |
833 | free_capabilities(resource); | |
834 | res = read_capabilities(resource); | |
835 | if (res) | |
836 | break; | |
837 | ||
838 | remove_attrs(resource); | |
839 | setup_attrs(resource); | |
840 | break; | |
841 | case METER_NOTIFY_TRIP: | |
842 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
843 | update_meter(resource); | |
844 | break; | |
845 | case METER_NOTIFY_CAP: | |
846 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
847 | update_cap(resource); | |
848 | break; | |
849 | case METER_NOTIFY_INTERVAL: | |
850 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
851 | update_avg_interval(resource); | |
852 | break; | |
853 | case METER_NOTIFY_CAPPING: | |
854 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
855 | dev_info(&device->dev, "Capping in progress.\n"); | |
856 | break; | |
857 | default: | |
858 | BUG(); | |
859 | } | |
860 | mutex_unlock(&resource->lock); | |
861 | ||
862 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
863 | dev_name(&device->dev), event, 0); | |
864 | } | |
865 | ||
866 | static int acpi_power_meter_add(struct acpi_device *device) | |
867 | { | |
868 | int res; | |
869 | struct acpi_power_meter_resource *resource; | |
870 | ||
871 | if (!device) | |
872 | return -EINVAL; | |
873 | ||
874 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
875 | GFP_KERNEL); | |
876 | if (!resource) | |
877 | return -ENOMEM; | |
878 | ||
879 | resource->sensors_valid = 0; | |
880 | resource->acpi_dev = device; | |
881 | mutex_init(&resource->lock); | |
882 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
883 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
884 | device->driver_data = resource; | |
885 | ||
886 | free_capabilities(resource); | |
887 | res = read_capabilities(resource); | |
888 | if (res) | |
889 | goto exit_free; | |
890 | ||
891 | resource->trip[0] = resource->trip[1] = -1; | |
892 | ||
893 | res = setup_attrs(resource); | |
894 | if (res) | |
895 | goto exit_free; | |
896 | ||
897 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
898 | if (IS_ERR(resource->hwmon_dev)) { | |
899 | res = PTR_ERR(resource->hwmon_dev); | |
900 | goto exit_remove; | |
901 | } | |
902 | ||
903 | res = 0; | |
904 | goto exit; | |
905 | ||
906 | exit_remove: | |
907 | remove_attrs(resource); | |
908 | exit_free: | |
909 | kfree(resource); | |
910 | exit: | |
911 | return res; | |
912 | } | |
913 | ||
51fac838 | 914 | static int acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
915 | { |
916 | struct acpi_power_meter_resource *resource; | |
917 | ||
918 | if (!device || !acpi_driver_data(device)) | |
919 | return -EINVAL; | |
920 | ||
921 | resource = acpi_driver_data(device); | |
922 | hwmon_device_unregister(resource->hwmon_dev); | |
923 | ||
924 | free_capabilities(resource); | |
925 | remove_attrs(resource); | |
926 | ||
927 | kfree(resource); | |
928 | return 0; | |
929 | } | |
930 | ||
9baeb8fd GR |
931 | #ifdef CONFIG_PM_SLEEP |
932 | ||
c5dec018 | 933 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
934 | { |
935 | struct acpi_power_meter_resource *resource; | |
936 | ||
c5dec018 RW |
937 | if (!dev) |
938 | return -EINVAL; | |
939 | ||
940 | resource = acpi_driver_data(to_acpi_device(dev)); | |
941 | if (!resource) | |
de584afa DW |
942 | return -EINVAL; |
943 | ||
de584afa DW |
944 | free_capabilities(resource); |
945 | read_capabilities(resource); | |
946 | ||
947 | return 0; | |
948 | } | |
949 | ||
9baeb8fd GR |
950 | #endif /* CONFIG_PM_SLEEP */ |
951 | ||
c5dec018 RW |
952 | static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); |
953 | ||
de584afa DW |
954 | static struct acpi_driver acpi_power_meter_driver = { |
955 | .name = "power_meter", | |
956 | .class = ACPI_POWER_METER_CLASS, | |
957 | .ids = power_meter_ids, | |
958 | .ops = { | |
959 | .add = acpi_power_meter_add, | |
960 | .remove = acpi_power_meter_remove, | |
de584afa DW |
961 | .notify = acpi_power_meter_notify, |
962 | }, | |
c5dec018 | 963 | .drv.pm = &acpi_power_meter_pm, |
de584afa DW |
964 | }; |
965 | ||
966 | /* Module init/exit routines */ | |
967 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
968 | { | |
969 | cap_in_hardware = 1; | |
970 | return 0; | |
971 | } | |
972 | ||
973 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
974 | { | |
975 | enable_cap_knobs, "IBM Active Energy Manager", | |
976 | { | |
977 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
978 | }, | |
979 | }, | |
980 | {} | |
981 | }; | |
982 | ||
983 | static int __init acpi_power_meter_init(void) | |
984 | { | |
985 | int result; | |
986 | ||
987 | if (acpi_disabled) | |
988 | return -ENODEV; | |
989 | ||
990 | dmi_check_system(pm_dmi_table); | |
991 | ||
992 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
993 | if (result < 0) | |
994 | return -ENODEV; | |
995 | ||
996 | return 0; | |
997 | } | |
998 | ||
999 | static void __exit acpi_power_meter_exit(void) | |
1000 | { | |
1001 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1002 | } | |
1003 | ||
5407e051 | 1004 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
1005 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
1006 | MODULE_LICENSE("GPL"); | |
1007 | ||
1008 | module_param(force_cap_on, bool, 0644); | |
1009 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1010 | ||
1011 | module_init(acpi_power_meter_init); | |
1012 | module_exit(acpi_power_meter_exit); |