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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
de584afa DW |
2 | /* |
3 | * A hwmon driver for ACPI 4.0 power meters | |
4 | * Copyright (C) 2009 IBM | |
5 | * | |
5407e051 | 6 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
de584afa DW |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/hwmon.h> | |
11 | #include <linux/hwmon-sysfs.h> | |
12 | #include <linux/jiffies.h> | |
13 | #include <linux/mutex.h> | |
14 | #include <linux/dmi.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
de584afa DW |
16 | #include <linux/kdev_t.h> |
17 | #include <linux/sched.h> | |
18 | #include <linux/time.h> | |
fa845740 | 19 | #include <linux/err.h> |
8b48463f | 20 | #include <linux/acpi.h> |
de584afa DW |
21 | |
22 | #define ACPI_POWER_METER_NAME "power_meter" | |
de584afa | 23 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" |
18262714 | 24 | #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
de584afa DW |
25 | |
26 | #define NUM_SENSORS 17 | |
27 | ||
28 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
29 | #define POWER_METER_CAN_TRIP (1 << 1) | |
30 | #define POWER_METER_CAN_CAP (1 << 2) | |
31 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
32 | #define POWER_METER_IS_BATTERY (1 << 8) | |
33 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
1fefca6c | 34 | #define UNKNOWN_POWER 0xFFFFFFFF |
de584afa DW |
35 | |
36 | #define METER_NOTIFY_CONFIG 0x80 | |
37 | #define METER_NOTIFY_TRIP 0x81 | |
38 | #define METER_NOTIFY_CAP 0x82 | |
39 | #define METER_NOTIFY_CAPPING 0x83 | |
40 | #define METER_NOTIFY_INTERVAL 0x84 | |
41 | ||
42 | #define POWER_AVERAGE_NAME "power1_average" | |
43 | #define POWER_CAP_NAME "power1_cap" | |
44 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
45 | #define POWER_ALARM_NAME "power1_alarm" | |
46 | ||
47 | static int cap_in_hardware; | |
90ab5ee9 | 48 | static bool force_cap_on; |
de584afa DW |
49 | |
50 | static int can_cap_in_hardware(void) | |
51 | { | |
52 | return force_cap_on || cap_in_hardware; | |
53 | } | |
54 | ||
c97adf9e | 55 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
56 | {"ACPI000D", 0}, |
57 | {"", 0}, | |
58 | }; | |
59 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
60 | ||
61 | struct acpi_power_meter_capabilities { | |
439913ff LM |
62 | u64 flags; |
63 | u64 units; | |
64 | u64 type; | |
65 | u64 accuracy; | |
66 | u64 sampling_time; | |
67 | u64 min_avg_interval; | |
68 | u64 max_avg_interval; | |
69 | u64 hysteresis; | |
70 | u64 configurable_cap; | |
71 | u64 min_cap; | |
72 | u64 max_cap; | |
de584afa DW |
73 | }; |
74 | ||
75 | struct acpi_power_meter_resource { | |
76 | struct acpi_device *acpi_dev; | |
77 | acpi_bus_id name; | |
78 | struct mutex lock; | |
79 | struct device *hwmon_dev; | |
80 | struct acpi_power_meter_capabilities caps; | |
81 | acpi_string model_number; | |
82 | acpi_string serial_number; | |
83 | acpi_string oem_info; | |
439913ff LM |
84 | u64 power; |
85 | u64 cap; | |
86 | u64 avg_interval; | |
de584afa DW |
87 | int sensors_valid; |
88 | unsigned long sensors_last_updated; | |
89 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
90 | int num_sensors; | |
75311bea | 91 | s64 trip[2]; |
de584afa DW |
92 | int num_domain_devices; |
93 | struct acpi_device **domain_devices; | |
94 | struct kobject *holders_dir; | |
95 | }; | |
96 | ||
81194cd2 | 97 | struct sensor_template { |
de584afa DW |
98 | char *label; |
99 | ssize_t (*show)(struct device *dev, | |
100 | struct device_attribute *devattr, | |
101 | char *buf); | |
102 | ssize_t (*set)(struct device *dev, | |
103 | struct device_attribute *devattr, | |
104 | const char *buf, size_t count); | |
105 | int index; | |
106 | }; | |
107 | ||
108 | /* Averaging interval */ | |
109 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
110 | { | |
111 | unsigned long long data; | |
112 | acpi_status status; | |
113 | ||
114 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
115 | NULL, &data); | |
116 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
117 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI", |
118 | status); | |
de584afa DW |
119 | return -ENODEV; |
120 | } | |
121 | ||
122 | resource->avg_interval = data; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static ssize_t show_avg_interval(struct device *dev, | |
127 | struct device_attribute *devattr, | |
128 | char *buf) | |
129 | { | |
130 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
131 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
132 | ||
133 | mutex_lock(&resource->lock); | |
134 | update_avg_interval(resource); | |
135 | mutex_unlock(&resource->lock); | |
136 | ||
137 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
138 | } | |
139 | ||
140 | static ssize_t set_avg_interval(struct device *dev, | |
141 | struct device_attribute *devattr, | |
142 | const char *buf, size_t count) | |
143 | { | |
144 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
145 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
146 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
147 | struct acpi_object_list args = { 1, &arg0 }; | |
148 | int res; | |
149 | unsigned long temp; | |
150 | unsigned long long data; | |
151 | acpi_status status; | |
152 | ||
179c4fdb | 153 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
154 | if (res) |
155 | return res; | |
156 | ||
157 | if (temp > resource->caps.max_avg_interval || | |
158 | temp < resource->caps.min_avg_interval) | |
159 | return -EINVAL; | |
160 | arg0.integer.value = temp; | |
161 | ||
162 | mutex_lock(&resource->lock); | |
163 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
164 | &args, &data); | |
10e92724 | 165 | if (ACPI_SUCCESS(status)) |
de584afa DW |
166 | resource->avg_interval = temp; |
167 | mutex_unlock(&resource->lock); | |
168 | ||
169 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
170 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI", |
171 | status); | |
de584afa DW |
172 | return -EINVAL; |
173 | } | |
174 | ||
175 | /* _PAI returns 0 on success, nonzero otherwise */ | |
176 | if (data) | |
177 | return -EINVAL; | |
178 | ||
179 | return count; | |
180 | } | |
181 | ||
182 | /* Cap functions */ | |
183 | static int update_cap(struct acpi_power_meter_resource *resource) | |
184 | { | |
185 | unsigned long long data; | |
186 | acpi_status status; | |
187 | ||
188 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
189 | NULL, &data); | |
190 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
191 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL", |
192 | status); | |
de584afa DW |
193 | return -ENODEV; |
194 | } | |
195 | ||
196 | resource->cap = data; | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static ssize_t show_cap(struct device *dev, | |
201 | struct device_attribute *devattr, | |
202 | char *buf) | |
203 | { | |
204 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
205 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
206 | ||
207 | mutex_lock(&resource->lock); | |
208 | update_cap(resource); | |
209 | mutex_unlock(&resource->lock); | |
210 | ||
211 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
212 | } | |
213 | ||
214 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
215 | const char *buf, size_t count) | |
216 | { | |
217 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
218 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
219 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
220 | struct acpi_object_list args = { 1, &arg0 }; | |
221 | int res; | |
222 | unsigned long temp; | |
223 | unsigned long long data; | |
224 | acpi_status status; | |
225 | ||
179c4fdb | 226 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
227 | if (res) |
228 | return res; | |
229 | ||
27c4db39 | 230 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
231 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
232 | return -EINVAL; | |
233 | arg0.integer.value = temp; | |
234 | ||
235 | mutex_lock(&resource->lock); | |
236 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
237 | &args, &data); | |
10e92724 | 238 | if (ACPI_SUCCESS(status)) |
de584afa DW |
239 | resource->cap = temp; |
240 | mutex_unlock(&resource->lock); | |
241 | ||
242 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
243 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL", |
244 | status); | |
de584afa DW |
245 | return -EINVAL; |
246 | } | |
247 | ||
248 | /* _SHL returns 0 on success, nonzero otherwise */ | |
249 | if (data) | |
250 | return -EINVAL; | |
251 | ||
252 | return count; | |
253 | } | |
254 | ||
255 | /* Power meter trip points */ | |
256 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
257 | { | |
258 | union acpi_object arg_objs[] = { | |
259 | {ACPI_TYPE_INTEGER}, | |
260 | {ACPI_TYPE_INTEGER} | |
261 | }; | |
262 | struct acpi_object_list args = { 2, arg_objs }; | |
263 | unsigned long long data; | |
264 | acpi_status status; | |
265 | ||
266 | /* Both trip levels must be set */ | |
267 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
268 | return 0; | |
269 | ||
270 | /* This driver stores min, max; ACPI wants max, min. */ | |
271 | arg_objs[0].integer.value = resource->trip[1]; | |
272 | arg_objs[1].integer.value = resource->trip[0]; | |
273 | ||
274 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
275 | &args, &data); | |
276 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
277 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP", |
278 | status); | |
de584afa DW |
279 | return -EINVAL; |
280 | } | |
281 | ||
22aecebf DW |
282 | /* _PTP returns 0 on success, nonzero otherwise */ |
283 | if (data) | |
284 | return -EINVAL; | |
285 | ||
286 | return 0; | |
de584afa DW |
287 | } |
288 | ||
289 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
290 | const char *buf, size_t count) | |
291 | { | |
292 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
293 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
294 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
295 | int res; | |
296 | unsigned long temp; | |
297 | ||
179c4fdb | 298 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
299 | if (res) |
300 | return res; | |
301 | ||
27c4db39 | 302 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
303 | |
304 | mutex_lock(&resource->lock); | |
305 | resource->trip[attr->index - 7] = temp; | |
306 | res = set_acpi_trip(resource); | |
307 | mutex_unlock(&resource->lock); | |
308 | ||
309 | if (res) | |
310 | return res; | |
311 | ||
312 | return count; | |
313 | } | |
314 | ||
315 | /* Power meter */ | |
316 | static int update_meter(struct acpi_power_meter_resource *resource) | |
317 | { | |
318 | unsigned long long data; | |
319 | acpi_status status; | |
320 | unsigned long local_jiffies = jiffies; | |
321 | ||
322 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
323 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
324 | resource->sensors_valid) | |
325 | return 0; | |
326 | ||
327 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
328 | NULL, &data); | |
329 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
330 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM", |
331 | status); | |
de584afa DW |
332 | return -ENODEV; |
333 | } | |
334 | ||
335 | resource->power = data; | |
336 | resource->sensors_valid = 1; | |
337 | resource->sensors_last_updated = jiffies; | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static ssize_t show_power(struct device *dev, | |
342 | struct device_attribute *devattr, | |
343 | char *buf) | |
344 | { | |
345 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
346 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
347 | ||
348 | mutex_lock(&resource->lock); | |
349 | update_meter(resource); | |
350 | mutex_unlock(&resource->lock); | |
351 | ||
1fefca6c AW |
352 | if (resource->power == UNKNOWN_POWER) |
353 | return -ENODATA; | |
354 | ||
de584afa DW |
355 | return sprintf(buf, "%llu\n", resource->power * 1000); |
356 | } | |
357 | ||
358 | /* Miscellaneous */ | |
359 | static ssize_t show_str(struct device *dev, | |
360 | struct device_attribute *devattr, | |
361 | char *buf) | |
362 | { | |
363 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
364 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
365 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
366 | acpi_string val; | |
badcd454 | 367 | int ret; |
de584afa | 368 | |
badcd454 | 369 | mutex_lock(&resource->lock); |
de584afa DW |
370 | switch (attr->index) { |
371 | case 0: | |
372 | val = resource->model_number; | |
373 | break; | |
374 | case 1: | |
375 | val = resource->serial_number; | |
376 | break; | |
377 | case 2: | |
378 | val = resource->oem_info; | |
379 | break; | |
380 | default: | |
83c97fe1 GR |
381 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
382 | attr->index); | |
776cdc11 | 383 | val = ""; |
83c97fe1 | 384 | break; |
de584afa | 385 | } |
badcd454 GR |
386 | ret = sprintf(buf, "%s\n", val); |
387 | mutex_unlock(&resource->lock); | |
388 | return ret; | |
de584afa DW |
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: | |
83c97fe1 GR |
439 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
440 | attr->index); | |
441 | break; | |
de584afa DW |
442 | } |
443 | ||
444 | return sprintf(buf, "%llu\n", val); | |
445 | } | |
446 | ||
447 | static ssize_t show_accuracy(struct device *dev, | |
448 | struct device_attribute *devattr, | |
449 | char *buf) | |
450 | { | |
451 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
452 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
453 | unsigned int acc = resource->caps.accuracy; | |
454 | ||
455 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
456 | } | |
457 | ||
458 | static ssize_t show_name(struct device *dev, | |
459 | struct device_attribute *devattr, | |
460 | char *buf) | |
461 | { | |
462 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
463 | } | |
464 | ||
3c45f2c7 KM |
465 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
466 | { \ | |
467 | .label = _label, \ | |
468 | .show = _show, \ | |
469 | .index = _index, \ | |
470 | } | |
471 | ||
472 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
473 | { \ | |
474 | .label = _label, \ | |
475 | .show = _show, \ | |
476 | .set = _set, \ | |
477 | .index = _index, \ | |
478 | } | |
479 | ||
de584afa | 480 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 481 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
482 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
483 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
484 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
485 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
486 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 | 487 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
59e746ca | 488 | set_avg_interval, 0), |
81194cd2 | 489 | {}, |
de584afa DW |
490 | }; |
491 | ||
81194cd2 | 492 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
493 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
494 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
495 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
496 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 497 | {}, |
de584afa DW |
498 | }; |
499 | ||
81194cd2 | 500 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 501 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 502 | {}, |
de584afa DW |
503 | }; |
504 | ||
81194cd2 | 505 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 506 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 507 | {}, |
de584afa DW |
508 | }; |
509 | ||
81194cd2 | 510 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
511 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
512 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 513 | {}, |
de584afa DW |
514 | }; |
515 | ||
81194cd2 | 516 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
517 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
518 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
519 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
520 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 521 | {}, |
de584afa DW |
522 | }; |
523 | ||
3c45f2c7 KM |
524 | #undef RO_SENSOR_TEMPLATE |
525 | #undef RW_SENSOR_TEMPLATE | |
526 | ||
de584afa DW |
527 | /* Read power domain data */ |
528 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
529 | { | |
530 | int i; | |
531 | ||
532 | if (!resource->num_domain_devices) | |
533 | return; | |
534 | ||
535 | for (i = 0; i < resource->num_domain_devices; i++) { | |
536 | struct acpi_device *obj = resource->domain_devices[i]; | |
59e746ca | 537 | |
de584afa DW |
538 | if (!obj) |
539 | continue; | |
540 | ||
541 | sysfs_remove_link(resource->holders_dir, | |
542 | kobject_name(&obj->dev.kobj)); | |
2c59a32d | 543 | acpi_dev_put(obj); |
de584afa DW |
544 | } |
545 | ||
546 | kfree(resource->domain_devices); | |
547 | kobject_put(resource->holders_dir); | |
7f07a605 | 548 | resource->num_domain_devices = 0; |
de584afa DW |
549 | } |
550 | ||
551 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
552 | { | |
553 | int res = 0; | |
554 | int i; | |
555 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
556 | union acpi_object *pss; | |
557 | acpi_status status; | |
558 | ||
559 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
560 | &buffer); | |
561 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
562 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD", |
563 | status); | |
de584afa DW |
564 | return -ENODEV; |
565 | } | |
566 | ||
567 | pss = buffer.pointer; | |
568 | if (!pss || | |
569 | pss->type != ACPI_TYPE_PACKAGE) { | |
570 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
571 | "Invalid _PMD data\n"); | |
572 | res = -EFAULT; | |
573 | goto end; | |
574 | } | |
575 | ||
576 | if (!pss->package.count) | |
577 | goto end; | |
578 | ||
6396bb22 KC |
579 | resource->domain_devices = kcalloc(pss->package.count, |
580 | sizeof(struct acpi_device *), | |
581 | GFP_KERNEL); | |
de584afa DW |
582 | if (!resource->domain_devices) { |
583 | res = -ENOMEM; | |
584 | goto end; | |
585 | } | |
586 | ||
587 | resource->holders_dir = kobject_create_and_add("measures", | |
59e746ca | 588 | &resource->acpi_dev->dev.kobj); |
de584afa DW |
589 | if (!resource->holders_dir) { |
590 | res = -ENOMEM; | |
591 | goto exit_free; | |
592 | } | |
593 | ||
594 | resource->num_domain_devices = pss->package.count; | |
595 | ||
596 | for (i = 0; i < pss->package.count; i++) { | |
597 | struct acpi_device *obj; | |
59e746ca | 598 | union acpi_object *element = &pss->package.elements[i]; |
de584afa DW |
599 | |
600 | /* Refuse non-references */ | |
601 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
602 | continue; | |
603 | ||
604 | /* Create a symlink to domain objects */ | |
45e9aa1f | 605 | obj = acpi_get_acpi_dev(element->reference.handle); |
2c59a32d RW |
606 | resource->domain_devices[i] = obj; |
607 | if (!obj) | |
de584afa DW |
608 | continue; |
609 | ||
de584afa | 610 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, |
59e746ca | 611 | kobject_name(&obj->dev.kobj)); |
de584afa | 612 | if (res) { |
2c59a32d | 613 | acpi_dev_put(obj); |
de584afa DW |
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; | |
419eeabc | 639 | sensors->dev_attr.attr.mode = 0444; |
f49d6a7e KM |
640 | sensors->dev_attr.show = attrs->show; |
641 | sensors->index = attrs->index; | |
de584afa | 642 | |
f49d6a7e | 643 | if (attrs->set) { |
419eeabc | 644 | sensors->dev_attr.attr.mode |= 0200; |
f49d6a7e | 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()) { | |
6e4d91aa WS |
695 | dev_warn(&resource->acpi_dev->dev, |
696 | "Ignoring unsafe software power cap!\n"); | |
de584afa DW |
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; | |
96eca8c9 | 736 | for (i = 0; i < 3; i++, str++) { |
de584afa | 737 | kfree(*str); |
96eca8c9 DC |
738 | *str = NULL; |
739 | } | |
de584afa DW |
740 | } |
741 | ||
742 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
743 | { | |
744 | int res = 0; | |
745 | int i; | |
746 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
747 | struct acpi_buffer state = { 0, NULL }; | |
748 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
749 | union acpi_object *pss; | |
750 | acpi_string *str; | |
751 | acpi_status status; | |
752 | ||
753 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
754 | &buffer); | |
755 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
756 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC", |
757 | status); | |
de584afa DW |
758 | return -ENODEV; |
759 | } | |
760 | ||
761 | pss = buffer.pointer; | |
762 | if (!pss || | |
763 | pss->type != ACPI_TYPE_PACKAGE || | |
764 | pss->package.count != 14) { | |
765 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
766 | "Invalid _PMC data\n"); | |
767 | res = -EFAULT; | |
768 | goto end; | |
769 | } | |
770 | ||
771 | /* Grab all the integer data at once */ | |
772 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
773 | state.pointer = &resource->caps; | |
774 | ||
775 | status = acpi_extract_package(pss, &format, &state); | |
776 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
777 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME |
778 | "_PMC package parsing failed: %s\n", | |
779 | acpi_format_exception(status)); | |
de584afa DW |
780 | res = -EFAULT; |
781 | goto end; | |
782 | } | |
783 | ||
784 | if (resource->caps.units) { | |
785 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
786 | "Unknown units %llu.\n", | |
787 | resource->caps.units); | |
788 | res = -EINVAL; | |
789 | goto end; | |
790 | } | |
791 | ||
792 | /* Grab the string data */ | |
793 | str = &resource->model_number; | |
794 | ||
795 | for (i = 11; i < 14; i++) { | |
59e746ca | 796 | union acpi_object *element = &pss->package.elements[i]; |
de584afa DW |
797 | |
798 | if (element->type != ACPI_TYPE_STRING) { | |
799 | res = -EINVAL; | |
800 | goto error; | |
801 | } | |
802 | ||
9cca73d7 JS |
803 | *str = kmemdup_nul(element->string.pointer, element->string.length, |
804 | GFP_KERNEL); | |
de584afa DW |
805 | if (!*str) { |
806 | res = -ENOMEM; | |
807 | goto error; | |
808 | } | |
809 | ||
de584afa DW |
810 | str++; |
811 | } | |
812 | ||
813 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
814 | goto end; | |
815 | error: | |
96eca8c9 | 816 | free_capabilities(resource); |
de584afa DW |
817 | end: |
818 | kfree(buffer.pointer); | |
819 | return res; | |
820 | } | |
821 | ||
822 | /* Handle ACPI event notifications */ | |
823 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
824 | { | |
825 | struct acpi_power_meter_resource *resource; | |
826 | int res; | |
827 | ||
828 | if (!device || !acpi_driver_data(device)) | |
829 | return; | |
830 | ||
831 | resource = acpi_driver_data(device); | |
832 | ||
de584afa DW |
833 | switch (event) { |
834 | case METER_NOTIFY_CONFIG: | |
badcd454 | 835 | mutex_lock(&resource->lock); |
de584afa DW |
836 | free_capabilities(resource); |
837 | res = read_capabilities(resource); | |
badcd454 | 838 | mutex_unlock(&resource->lock); |
de584afa DW |
839 | if (res) |
840 | break; | |
841 | ||
842 | remove_attrs(resource); | |
843 | setup_attrs(resource); | |
844 | break; | |
845 | case METER_NOTIFY_TRIP: | |
846 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
de584afa DW |
847 | break; |
848 | case METER_NOTIFY_CAP: | |
849 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
de584afa DW |
850 | break; |
851 | case METER_NOTIFY_INTERVAL: | |
852 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
de584afa DW |
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: | |
83c97fe1 GR |
859 | WARN(1, "Unexpected event %d\n", event); |
860 | break; | |
de584afa | 861 | } |
de584afa DW |
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 | ||
59e746ca | 875 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
de584afa DW |
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 | ||
71113b9b KHF |
886 | #if IS_REACHABLE(CONFIG_ACPI_IPMI) |
887 | /* | |
888 | * On Dell systems several methods of acpi_power_meter access | |
889 | * variables in IPMI region, so wait until IPMI space handler is | |
890 | * installed by acpi_ipmi and also wait until SMI is selected to make | |
891 | * the space handler fully functional. | |
892 | */ | |
893 | if (dmi_match(DMI_SYS_VENDOR, "Dell Inc.")) { | |
894 | struct acpi_device *ipi_device = acpi_dev_get_first_match_dev("IPI0001", NULL, -1); | |
895 | ||
896 | if (ipi_device && acpi_wait_for_acpi_ipmi()) | |
897 | dev_warn(&device->dev, "Waiting for ACPI IPMI timeout"); | |
898 | acpi_dev_put(ipi_device); | |
899 | } | |
900 | #endif | |
901 | ||
de584afa DW |
902 | res = read_capabilities(resource); |
903 | if (res) | |
904 | goto exit_free; | |
905 | ||
59e746ca CL |
906 | resource->trip[0] = -1; |
907 | resource->trip[1] = -1; | |
de584afa DW |
908 | |
909 | res = setup_attrs(resource); | |
910 | if (res) | |
8b97f992 | 911 | goto exit_free_capability; |
de584afa DW |
912 | |
913 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
914 | if (IS_ERR(resource->hwmon_dev)) { | |
915 | res = PTR_ERR(resource->hwmon_dev); | |
916 | goto exit_remove; | |
917 | } | |
918 | ||
919 | res = 0; | |
920 | goto exit; | |
921 | ||
922 | exit_remove: | |
923 | remove_attrs(resource); | |
8b97f992 MT |
924 | exit_free_capability: |
925 | free_capabilities(resource); | |
de584afa DW |
926 | exit_free: |
927 | kfree(resource); | |
928 | exit: | |
929 | return res; | |
930 | } | |
931 | ||
6c0eb5ba | 932 | static void acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
933 | { |
934 | struct acpi_power_meter_resource *resource; | |
935 | ||
936 | if (!device || !acpi_driver_data(device)) | |
6c0eb5ba | 937 | return; |
de584afa DW |
938 | |
939 | resource = acpi_driver_data(device); | |
940 | hwmon_device_unregister(resource->hwmon_dev); | |
941 | ||
de584afa | 942 | remove_attrs(resource); |
badcd454 | 943 | free_capabilities(resource); |
de584afa DW |
944 | |
945 | kfree(resource); | |
de584afa DW |
946 | } |
947 | ||
c5dec018 | 948 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
949 | { |
950 | struct acpi_power_meter_resource *resource; | |
951 | ||
c5dec018 RW |
952 | if (!dev) |
953 | return -EINVAL; | |
954 | ||
955 | resource = acpi_driver_data(to_acpi_device(dev)); | |
956 | if (!resource) | |
de584afa DW |
957 | return -EINVAL; |
958 | ||
de584afa DW |
959 | free_capabilities(resource); |
960 | read_capabilities(resource); | |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
00f4095c JC |
965 | static DEFINE_SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, |
966 | acpi_power_meter_resume); | |
c5dec018 | 967 | |
de584afa DW |
968 | static struct acpi_driver acpi_power_meter_driver = { |
969 | .name = "power_meter", | |
970 | .class = ACPI_POWER_METER_CLASS, | |
971 | .ids = power_meter_ids, | |
972 | .ops = { | |
973 | .add = acpi_power_meter_add, | |
974 | .remove = acpi_power_meter_remove, | |
de584afa DW |
975 | .notify = acpi_power_meter_notify, |
976 | }, | |
00f4095c | 977 | .drv.pm = pm_sleep_ptr(&acpi_power_meter_pm), |
de584afa DW |
978 | }; |
979 | ||
980 | /* Module init/exit routines */ | |
981 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
982 | { | |
983 | cap_in_hardware = 1; | |
984 | return 0; | |
985 | } | |
986 | ||
6faadbbb | 987 | static const struct dmi_system_id pm_dmi_table[] __initconst = { |
de584afa DW |
988 | { |
989 | enable_cap_knobs, "IBM Active Energy Manager", | |
990 | { | |
991 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
992 | }, | |
993 | }, | |
994 | {} | |
995 | }; | |
996 | ||
997 | static int __init acpi_power_meter_init(void) | |
998 | { | |
999 | int result; | |
1000 | ||
1001 | if (acpi_disabled) | |
1002 | return -ENODEV; | |
1003 | ||
1004 | dmi_check_system(pm_dmi_table); | |
1005 | ||
1006 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
1007 | if (result < 0) | |
19f053c8 | 1008 | return result; |
de584afa DW |
1009 | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | static void __exit acpi_power_meter_exit(void) | |
1014 | { | |
1015 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1016 | } | |
1017 | ||
5407e051 | 1018 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
1019 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
1020 | MODULE_LICENSE("GPL"); | |
1021 | ||
1022 | module_param(force_cap_on, bool, 0644); | |
1023 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1024 | ||
1025 | module_init(acpi_power_meter_init); | |
1026 | module_exit(acpi_power_meter_exit); |