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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 | |
34 | ||
35 | #define METER_NOTIFY_CONFIG 0x80 | |
36 | #define METER_NOTIFY_TRIP 0x81 | |
37 | #define METER_NOTIFY_CAP 0x82 | |
38 | #define METER_NOTIFY_CAPPING 0x83 | |
39 | #define METER_NOTIFY_INTERVAL 0x84 | |
40 | ||
41 | #define POWER_AVERAGE_NAME "power1_average" | |
42 | #define POWER_CAP_NAME "power1_cap" | |
43 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
44 | #define POWER_ALARM_NAME "power1_alarm" | |
45 | ||
46 | static int cap_in_hardware; | |
90ab5ee9 | 47 | static bool force_cap_on; |
de584afa DW |
48 | |
49 | static int can_cap_in_hardware(void) | |
50 | { | |
51 | return force_cap_on || cap_in_hardware; | |
52 | } | |
53 | ||
c97adf9e | 54 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
55 | {"ACPI000D", 0}, |
56 | {"", 0}, | |
57 | }; | |
58 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
59 | ||
60 | struct acpi_power_meter_capabilities { | |
439913ff LM |
61 | u64 flags; |
62 | u64 units; | |
63 | u64 type; | |
64 | u64 accuracy; | |
65 | u64 sampling_time; | |
66 | u64 min_avg_interval; | |
67 | u64 max_avg_interval; | |
68 | u64 hysteresis; | |
69 | u64 configurable_cap; | |
70 | u64 min_cap; | |
71 | u64 max_cap; | |
de584afa DW |
72 | }; |
73 | ||
74 | struct acpi_power_meter_resource { | |
75 | struct acpi_device *acpi_dev; | |
76 | acpi_bus_id name; | |
77 | struct mutex lock; | |
78 | struct device *hwmon_dev; | |
79 | struct acpi_power_meter_capabilities caps; | |
80 | acpi_string model_number; | |
81 | acpi_string serial_number; | |
82 | acpi_string oem_info; | |
439913ff LM |
83 | u64 power; |
84 | u64 cap; | |
85 | u64 avg_interval; | |
de584afa DW |
86 | int sensors_valid; |
87 | unsigned long sensors_last_updated; | |
88 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
89 | int num_sensors; | |
75311bea | 90 | s64 trip[2]; |
de584afa DW |
91 | int num_domain_devices; |
92 | struct acpi_device **domain_devices; | |
93 | struct kobject *holders_dir; | |
94 | }; | |
95 | ||
81194cd2 | 96 | struct sensor_template { |
de584afa DW |
97 | char *label; |
98 | ssize_t (*show)(struct device *dev, | |
99 | struct device_attribute *devattr, | |
100 | char *buf); | |
101 | ssize_t (*set)(struct device *dev, | |
102 | struct device_attribute *devattr, | |
103 | const char *buf, size_t count); | |
104 | int index; | |
105 | }; | |
106 | ||
107 | /* Averaging interval */ | |
108 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
109 | { | |
110 | unsigned long long data; | |
111 | acpi_status status; | |
112 | ||
113 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
114 | NULL, &data); | |
115 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
116 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI", |
117 | status); | |
de584afa DW |
118 | return -ENODEV; |
119 | } | |
120 | ||
121 | resource->avg_interval = data; | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static ssize_t show_avg_interval(struct device *dev, | |
126 | struct device_attribute *devattr, | |
127 | char *buf) | |
128 | { | |
129 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
130 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
131 | ||
132 | mutex_lock(&resource->lock); | |
133 | update_avg_interval(resource); | |
134 | mutex_unlock(&resource->lock); | |
135 | ||
136 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
137 | } | |
138 | ||
139 | static ssize_t set_avg_interval(struct device *dev, | |
140 | struct device_attribute *devattr, | |
141 | const char *buf, size_t count) | |
142 | { | |
143 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
144 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
145 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
146 | struct acpi_object_list args = { 1, &arg0 }; | |
147 | int res; | |
148 | unsigned long temp; | |
149 | unsigned long long data; | |
150 | acpi_status status; | |
151 | ||
179c4fdb | 152 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
153 | if (res) |
154 | return res; | |
155 | ||
156 | if (temp > resource->caps.max_avg_interval || | |
157 | temp < resource->caps.min_avg_interval) | |
158 | return -EINVAL; | |
159 | arg0.integer.value = temp; | |
160 | ||
161 | mutex_lock(&resource->lock); | |
162 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
163 | &args, &data); | |
10e92724 | 164 | if (ACPI_SUCCESS(status)) |
de584afa DW |
165 | resource->avg_interval = temp; |
166 | mutex_unlock(&resource->lock); | |
167 | ||
168 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
169 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI", |
170 | status); | |
de584afa DW |
171 | return -EINVAL; |
172 | } | |
173 | ||
174 | /* _PAI returns 0 on success, nonzero otherwise */ | |
175 | if (data) | |
176 | return -EINVAL; | |
177 | ||
178 | return count; | |
179 | } | |
180 | ||
181 | /* Cap functions */ | |
182 | static int update_cap(struct acpi_power_meter_resource *resource) | |
183 | { | |
184 | unsigned long long data; | |
185 | acpi_status status; | |
186 | ||
187 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
188 | NULL, &data); | |
189 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
190 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL", |
191 | status); | |
de584afa DW |
192 | return -ENODEV; |
193 | } | |
194 | ||
195 | resource->cap = data; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static ssize_t show_cap(struct device *dev, | |
200 | struct device_attribute *devattr, | |
201 | char *buf) | |
202 | { | |
203 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
204 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
205 | ||
206 | mutex_lock(&resource->lock); | |
207 | update_cap(resource); | |
208 | mutex_unlock(&resource->lock); | |
209 | ||
210 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
211 | } | |
212 | ||
213 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
214 | const char *buf, size_t count) | |
215 | { | |
216 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
217 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
218 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
219 | struct acpi_object_list args = { 1, &arg0 }; | |
220 | int res; | |
221 | unsigned long temp; | |
222 | unsigned long long data; | |
223 | acpi_status status; | |
224 | ||
179c4fdb | 225 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
226 | if (res) |
227 | return res; | |
228 | ||
27c4db39 | 229 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
230 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
231 | return -EINVAL; | |
232 | arg0.integer.value = temp; | |
233 | ||
234 | mutex_lock(&resource->lock); | |
235 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
236 | &args, &data); | |
10e92724 | 237 | if (ACPI_SUCCESS(status)) |
de584afa DW |
238 | resource->cap = temp; |
239 | mutex_unlock(&resource->lock); | |
240 | ||
241 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
242 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL", |
243 | status); | |
de584afa DW |
244 | return -EINVAL; |
245 | } | |
246 | ||
247 | /* _SHL returns 0 on success, nonzero otherwise */ | |
248 | if (data) | |
249 | return -EINVAL; | |
250 | ||
251 | return count; | |
252 | } | |
253 | ||
254 | /* Power meter trip points */ | |
255 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
256 | { | |
257 | union acpi_object arg_objs[] = { | |
258 | {ACPI_TYPE_INTEGER}, | |
259 | {ACPI_TYPE_INTEGER} | |
260 | }; | |
261 | struct acpi_object_list args = { 2, arg_objs }; | |
262 | unsigned long long data; | |
263 | acpi_status status; | |
264 | ||
265 | /* Both trip levels must be set */ | |
266 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
267 | return 0; | |
268 | ||
269 | /* This driver stores min, max; ACPI wants max, min. */ | |
270 | arg_objs[0].integer.value = resource->trip[1]; | |
271 | arg_objs[1].integer.value = resource->trip[0]; | |
272 | ||
273 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
274 | &args, &data); | |
275 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
276 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP", |
277 | status); | |
de584afa DW |
278 | return -EINVAL; |
279 | } | |
280 | ||
22aecebf DW |
281 | /* _PTP returns 0 on success, nonzero otherwise */ |
282 | if (data) | |
283 | return -EINVAL; | |
284 | ||
285 | return 0; | |
de584afa DW |
286 | } |
287 | ||
288 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
289 | const char *buf, size_t count) | |
290 | { | |
291 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
292 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
293 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
294 | int res; | |
295 | unsigned long temp; | |
296 | ||
179c4fdb | 297 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
298 | if (res) |
299 | return res; | |
300 | ||
27c4db39 | 301 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
302 | |
303 | mutex_lock(&resource->lock); | |
304 | resource->trip[attr->index - 7] = temp; | |
305 | res = set_acpi_trip(resource); | |
306 | mutex_unlock(&resource->lock); | |
307 | ||
308 | if (res) | |
309 | return res; | |
310 | ||
311 | return count; | |
312 | } | |
313 | ||
314 | /* Power meter */ | |
315 | static int update_meter(struct acpi_power_meter_resource *resource) | |
316 | { | |
317 | unsigned long long data; | |
318 | acpi_status status; | |
319 | unsigned long local_jiffies = jiffies; | |
320 | ||
321 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
322 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
323 | resource->sensors_valid) | |
324 | return 0; | |
325 | ||
326 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
327 | NULL, &data); | |
328 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
329 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM", |
330 | status); | |
de584afa DW |
331 | return -ENODEV; |
332 | } | |
333 | ||
334 | resource->power = data; | |
335 | resource->sensors_valid = 1; | |
336 | resource->sensors_last_updated = jiffies; | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static ssize_t show_power(struct device *dev, | |
341 | struct device_attribute *devattr, | |
342 | char *buf) | |
343 | { | |
344 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
345 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
346 | ||
347 | mutex_lock(&resource->lock); | |
348 | update_meter(resource); | |
349 | mutex_unlock(&resource->lock); | |
350 | ||
351 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
352 | } | |
353 | ||
354 | /* Miscellaneous */ | |
355 | static ssize_t show_str(struct device *dev, | |
356 | struct device_attribute *devattr, | |
357 | char *buf) | |
358 | { | |
359 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
360 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
361 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
362 | acpi_string val; | |
badcd454 | 363 | int ret; |
de584afa | 364 | |
badcd454 | 365 | mutex_lock(&resource->lock); |
de584afa DW |
366 | switch (attr->index) { |
367 | case 0: | |
368 | val = resource->model_number; | |
369 | break; | |
370 | case 1: | |
371 | val = resource->serial_number; | |
372 | break; | |
373 | case 2: | |
374 | val = resource->oem_info; | |
375 | break; | |
376 | default: | |
83c97fe1 GR |
377 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
378 | attr->index); | |
776cdc11 | 379 | val = ""; |
83c97fe1 | 380 | break; |
de584afa | 381 | } |
badcd454 GR |
382 | ret = sprintf(buf, "%s\n", val); |
383 | mutex_unlock(&resource->lock); | |
384 | return ret; | |
de584afa DW |
385 | } |
386 | ||
387 | static ssize_t show_val(struct device *dev, | |
388 | struct device_attribute *devattr, | |
389 | char *buf) | |
390 | { | |
391 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
392 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
393 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 394 | u64 val = 0; |
de584afa DW |
395 | |
396 | switch (attr->index) { | |
397 | case 0: | |
398 | val = resource->caps.min_avg_interval; | |
399 | break; | |
400 | case 1: | |
401 | val = resource->caps.max_avg_interval; | |
402 | break; | |
403 | case 2: | |
404 | val = resource->caps.min_cap * 1000; | |
405 | break; | |
406 | case 3: | |
407 | val = resource->caps.max_cap * 1000; | |
408 | break; | |
409 | case 4: | |
410 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
411 | return sprintf(buf, "unknown\n"); | |
412 | ||
413 | val = resource->caps.hysteresis * 1000; | |
414 | break; | |
415 | case 5: | |
416 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
417 | val = 1; | |
418 | else | |
419 | val = 0; | |
420 | break; | |
421 | case 6: | |
422 | if (resource->power > resource->cap) | |
423 | val = 1; | |
424 | else | |
425 | val = 0; | |
426 | break; | |
427 | case 7: | |
428 | case 8: | |
429 | if (resource->trip[attr->index - 7] < 0) | |
430 | return sprintf(buf, "unknown\n"); | |
431 | ||
432 | val = resource->trip[attr->index - 7] * 1000; | |
433 | break; | |
434 | default: | |
83c97fe1 GR |
435 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
436 | attr->index); | |
437 | break; | |
de584afa DW |
438 | } |
439 | ||
440 | return sprintf(buf, "%llu\n", val); | |
441 | } | |
442 | ||
443 | static ssize_t show_accuracy(struct device *dev, | |
444 | struct device_attribute *devattr, | |
445 | char *buf) | |
446 | { | |
447 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
448 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
449 | unsigned int acc = resource->caps.accuracy; | |
450 | ||
451 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
452 | } | |
453 | ||
454 | static ssize_t show_name(struct device *dev, | |
455 | struct device_attribute *devattr, | |
456 | char *buf) | |
457 | { | |
458 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
459 | } | |
460 | ||
3c45f2c7 KM |
461 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
462 | { \ | |
463 | .label = _label, \ | |
464 | .show = _show, \ | |
465 | .index = _index, \ | |
466 | } | |
467 | ||
468 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
469 | { \ | |
470 | .label = _label, \ | |
471 | .show = _show, \ | |
472 | .set = _set, \ | |
473 | .index = _index, \ | |
474 | } | |
475 | ||
de584afa | 476 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 477 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
478 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
479 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
480 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
481 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
482 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 | 483 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
59e746ca | 484 | set_avg_interval, 0), |
81194cd2 | 485 | {}, |
de584afa DW |
486 | }; |
487 | ||
81194cd2 | 488 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
489 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
490 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
491 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
492 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 493 | {}, |
de584afa DW |
494 | }; |
495 | ||
81194cd2 | 496 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 497 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 498 | {}, |
de584afa DW |
499 | }; |
500 | ||
81194cd2 | 501 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 502 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 503 | {}, |
de584afa DW |
504 | }; |
505 | ||
81194cd2 | 506 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
507 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
508 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 509 | {}, |
de584afa DW |
510 | }; |
511 | ||
81194cd2 | 512 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
513 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
514 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
515 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
516 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 517 | {}, |
de584afa DW |
518 | }; |
519 | ||
3c45f2c7 KM |
520 | #undef RO_SENSOR_TEMPLATE |
521 | #undef RW_SENSOR_TEMPLATE | |
522 | ||
de584afa DW |
523 | /* Read power domain data */ |
524 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
525 | { | |
526 | int i; | |
527 | ||
528 | if (!resource->num_domain_devices) | |
529 | return; | |
530 | ||
531 | for (i = 0; i < resource->num_domain_devices; i++) { | |
532 | struct acpi_device *obj = resource->domain_devices[i]; | |
59e746ca | 533 | |
de584afa DW |
534 | if (!obj) |
535 | continue; | |
536 | ||
537 | sysfs_remove_link(resource->holders_dir, | |
538 | kobject_name(&obj->dev.kobj)); | |
2c59a32d | 539 | acpi_dev_put(obj); |
de584afa DW |
540 | } |
541 | ||
542 | kfree(resource->domain_devices); | |
543 | kobject_put(resource->holders_dir); | |
7f07a605 | 544 | resource->num_domain_devices = 0; |
de584afa DW |
545 | } |
546 | ||
547 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
548 | { | |
549 | int res = 0; | |
550 | int i; | |
551 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
552 | union acpi_object *pss; | |
553 | acpi_status status; | |
554 | ||
555 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
556 | &buffer); | |
557 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
558 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD", |
559 | status); | |
de584afa DW |
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 | ||
6396bb22 KC |
575 | resource->domain_devices = kcalloc(pss->package.count, |
576 | sizeof(struct acpi_device *), | |
577 | GFP_KERNEL); | |
de584afa DW |
578 | if (!resource->domain_devices) { |
579 | res = -ENOMEM; | |
580 | goto end; | |
581 | } | |
582 | ||
583 | resource->holders_dir = kobject_create_and_add("measures", | |
59e746ca | 584 | &resource->acpi_dev->dev.kobj); |
de584afa DW |
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; | |
59e746ca | 594 | union acpi_object *element = &pss->package.elements[i]; |
de584afa DW |
595 | |
596 | /* Refuse non-references */ | |
597 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
598 | continue; | |
599 | ||
600 | /* Create a symlink to domain objects */ | |
45e9aa1f | 601 | obj = acpi_get_acpi_dev(element->reference.handle); |
2c59a32d RW |
602 | resource->domain_devices[i] = obj; |
603 | if (!obj) | |
de584afa DW |
604 | continue; |
605 | ||
de584afa | 606 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, |
59e746ca | 607 | kobject_name(&obj->dev.kobj)); |
de584afa | 608 | if (res) { |
2c59a32d | 609 | acpi_dev_put(obj); |
de584afa DW |
610 | resource->domain_devices[i] = NULL; |
611 | } | |
612 | } | |
613 | ||
614 | res = 0; | |
615 | goto end; | |
616 | ||
617 | exit_free: | |
618 | kfree(resource->domain_devices); | |
619 | end: | |
620 | kfree(buffer.pointer); | |
621 | return res; | |
622 | } | |
623 | ||
624 | /* Registration and deregistration */ | |
f49d6a7e KM |
625 | static int register_attrs(struct acpi_power_meter_resource *resource, |
626 | struct sensor_template *attrs) | |
de584afa DW |
627 | { |
628 | struct device *dev = &resource->acpi_dev->dev; | |
629 | struct sensor_device_attribute *sensors = | |
630 | &resource->sensors[resource->num_sensors]; | |
631 | int res = 0; | |
632 | ||
f49d6a7e KM |
633 | while (attrs->label) { |
634 | sensors->dev_attr.attr.name = attrs->label; | |
419eeabc | 635 | sensors->dev_attr.attr.mode = 0444; |
f49d6a7e KM |
636 | sensors->dev_attr.show = attrs->show; |
637 | sensors->index = attrs->index; | |
de584afa | 638 | |
f49d6a7e | 639 | if (attrs->set) { |
419eeabc | 640 | sensors->dev_attr.attr.mode |= 0200; |
f49d6a7e | 641 | sensors->dev_attr.store = attrs->set; |
de584afa | 642 | } |
de584afa | 643 | |
31e354ee | 644 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
645 | res = device_create_file(dev, &sensors->dev_attr); |
646 | if (res) { | |
647 | sensors->dev_attr.attr.name = NULL; | |
648 | goto error; | |
649 | } | |
650 | sensors++; | |
651 | resource->num_sensors++; | |
f49d6a7e | 652 | attrs++; |
de584afa DW |
653 | } |
654 | ||
655 | error: | |
656 | return res; | |
657 | } | |
658 | ||
659 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
660 | { | |
661 | int i; | |
662 | ||
663 | for (i = 0; i < resource->num_sensors; i++) { | |
664 | if (!resource->sensors[i].dev_attr.attr.name) | |
665 | continue; | |
666 | device_remove_file(&resource->acpi_dev->dev, | |
667 | &resource->sensors[i].dev_attr); | |
668 | } | |
669 | ||
670 | remove_domain_devices(resource); | |
671 | ||
672 | resource->num_sensors = 0; | |
673 | } | |
674 | ||
675 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
676 | { | |
677 | int res = 0; | |
678 | ||
679 | res = read_domain_devices(resource); | |
680 | if (res) | |
681 | return res; | |
682 | ||
683 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 684 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
685 | if (res) |
686 | goto error; | |
687 | } | |
688 | ||
689 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
690 | if (!can_cap_in_hardware()) { | |
6e4d91aa WS |
691 | dev_warn(&resource->acpi_dev->dev, |
692 | "Ignoring unsafe software power cap!\n"); | |
de584afa DW |
693 | goto skip_unsafe_cap; |
694 | } | |
695 | ||
7bb5ee01 | 696 | if (resource->caps.configurable_cap) |
f49d6a7e | 697 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 698 | else |
f49d6a7e | 699 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
700 | |
701 | if (res) | |
702 | goto error; | |
703 | ||
f49d6a7e | 704 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
705 | if (res) |
706 | goto error; | |
707 | } | |
de584afa | 708 | |
7bb5ee01 | 709 | skip_unsafe_cap: |
de584afa | 710 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 711 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
712 | if (res) |
713 | goto error; | |
714 | } | |
715 | ||
f49d6a7e | 716 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
717 | if (res) |
718 | goto error; | |
719 | ||
720 | return res; | |
721 | error: | |
de584afa DW |
722 | remove_attrs(resource); |
723 | return res; | |
724 | } | |
725 | ||
726 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
727 | { | |
728 | acpi_string *str; | |
729 | int i; | |
730 | ||
731 | str = &resource->model_number; | |
96eca8c9 | 732 | for (i = 0; i < 3; i++, str++) { |
de584afa | 733 | kfree(*str); |
96eca8c9 DC |
734 | *str = NULL; |
735 | } | |
de584afa DW |
736 | } |
737 | ||
738 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
739 | { | |
740 | int res = 0; | |
741 | int i; | |
742 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
743 | struct acpi_buffer state = { 0, NULL }; | |
744 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
745 | union acpi_object *pss; | |
746 | acpi_string *str; | |
747 | acpi_status status; | |
748 | ||
749 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
750 | &buffer); | |
751 | if (ACPI_FAILURE(status)) { | |
ebf1bef3 RW |
752 | acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC", |
753 | status); | |
de584afa DW |
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)) { | |
ebf1bef3 RW |
773 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME |
774 | "_PMC package parsing failed: %s\n", | |
775 | acpi_format_exception(status)); | |
de584afa DW |
776 | res = -EFAULT; |
777 | goto end; | |
778 | } | |
779 | ||
780 | if (resource->caps.units) { | |
781 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
782 | "Unknown units %llu.\n", | |
783 | resource->caps.units); | |
784 | res = -EINVAL; | |
785 | goto end; | |
786 | } | |
787 | ||
788 | /* Grab the string data */ | |
789 | str = &resource->model_number; | |
790 | ||
791 | for (i = 11; i < 14; i++) { | |
59e746ca | 792 | union acpi_object *element = &pss->package.elements[i]; |
de584afa DW |
793 | |
794 | if (element->type != ACPI_TYPE_STRING) { | |
795 | res = -EINVAL; | |
796 | goto error; | |
797 | } | |
798 | ||
6396bb22 | 799 | *str = kcalloc(element->string.length + 1, sizeof(u8), |
de584afa DW |
800 | GFP_KERNEL); |
801 | if (!*str) { | |
802 | res = -ENOMEM; | |
803 | goto error; | |
804 | } | |
805 | ||
806 | strncpy(*str, element->string.pointer, element->string.length); | |
807 | str++; | |
808 | } | |
809 | ||
810 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
811 | goto end; | |
812 | error: | |
96eca8c9 | 813 | free_capabilities(resource); |
de584afa DW |
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 | ||
de584afa DW |
830 | switch (event) { |
831 | case METER_NOTIFY_CONFIG: | |
badcd454 | 832 | mutex_lock(&resource->lock); |
de584afa DW |
833 | free_capabilities(resource); |
834 | res = read_capabilities(resource); | |
badcd454 | 835 | mutex_unlock(&resource->lock); |
de584afa DW |
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); | |
de584afa DW |
844 | break; |
845 | case METER_NOTIFY_CAP: | |
846 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
de584afa DW |
847 | break; |
848 | case METER_NOTIFY_INTERVAL: | |
849 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
de584afa DW |
850 | break; |
851 | case METER_NOTIFY_CAPPING: | |
852 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
853 | dev_info(&device->dev, "Capping in progress.\n"); | |
854 | break; | |
855 | default: | |
83c97fe1 GR |
856 | WARN(1, "Unexpected event %d\n", event); |
857 | break; | |
de584afa | 858 | } |
de584afa DW |
859 | |
860 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
861 | dev_name(&device->dev), event, 0); | |
862 | } | |
863 | ||
864 | static int acpi_power_meter_add(struct acpi_device *device) | |
865 | { | |
866 | int res; | |
867 | struct acpi_power_meter_resource *resource; | |
868 | ||
869 | if (!device) | |
870 | return -EINVAL; | |
871 | ||
59e746ca | 872 | resource = kzalloc(sizeof(*resource), GFP_KERNEL); |
de584afa DW |
873 | if (!resource) |
874 | return -ENOMEM; | |
875 | ||
876 | resource->sensors_valid = 0; | |
877 | resource->acpi_dev = device; | |
878 | mutex_init(&resource->lock); | |
879 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
880 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
881 | device->driver_data = resource; | |
882 | ||
de584afa DW |
883 | res = read_capabilities(resource); |
884 | if (res) | |
885 | goto exit_free; | |
886 | ||
59e746ca CL |
887 | resource->trip[0] = -1; |
888 | resource->trip[1] = -1; | |
de584afa DW |
889 | |
890 | res = setup_attrs(resource); | |
891 | if (res) | |
8b97f992 | 892 | goto exit_free_capability; |
de584afa DW |
893 | |
894 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
895 | if (IS_ERR(resource->hwmon_dev)) { | |
896 | res = PTR_ERR(resource->hwmon_dev); | |
897 | goto exit_remove; | |
898 | } | |
899 | ||
900 | res = 0; | |
901 | goto exit; | |
902 | ||
903 | exit_remove: | |
904 | remove_attrs(resource); | |
8b97f992 MT |
905 | exit_free_capability: |
906 | free_capabilities(resource); | |
de584afa DW |
907 | exit_free: |
908 | kfree(resource); | |
909 | exit: | |
910 | return res; | |
911 | } | |
912 | ||
6c0eb5ba | 913 | static void acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
914 | { |
915 | struct acpi_power_meter_resource *resource; | |
916 | ||
917 | if (!device || !acpi_driver_data(device)) | |
6c0eb5ba | 918 | return; |
de584afa DW |
919 | |
920 | resource = acpi_driver_data(device); | |
921 | hwmon_device_unregister(resource->hwmon_dev); | |
922 | ||
de584afa | 923 | remove_attrs(resource); |
badcd454 | 924 | free_capabilities(resource); |
de584afa DW |
925 | |
926 | kfree(resource); | |
de584afa DW |
927 | } |
928 | ||
c5dec018 | 929 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
930 | { |
931 | struct acpi_power_meter_resource *resource; | |
932 | ||
c5dec018 RW |
933 | if (!dev) |
934 | return -EINVAL; | |
935 | ||
936 | resource = acpi_driver_data(to_acpi_device(dev)); | |
937 | if (!resource) | |
de584afa DW |
938 | return -EINVAL; |
939 | ||
de584afa DW |
940 | free_capabilities(resource); |
941 | read_capabilities(resource); | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
00f4095c JC |
946 | static DEFINE_SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, |
947 | acpi_power_meter_resume); | |
c5dec018 | 948 | |
de584afa DW |
949 | static struct acpi_driver acpi_power_meter_driver = { |
950 | .name = "power_meter", | |
951 | .class = ACPI_POWER_METER_CLASS, | |
952 | .ids = power_meter_ids, | |
953 | .ops = { | |
954 | .add = acpi_power_meter_add, | |
955 | .remove = acpi_power_meter_remove, | |
de584afa DW |
956 | .notify = acpi_power_meter_notify, |
957 | }, | |
00f4095c | 958 | .drv.pm = pm_sleep_ptr(&acpi_power_meter_pm), |
de584afa DW |
959 | }; |
960 | ||
961 | /* Module init/exit routines */ | |
962 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
963 | { | |
964 | cap_in_hardware = 1; | |
965 | return 0; | |
966 | } | |
967 | ||
6faadbbb | 968 | static const struct dmi_system_id pm_dmi_table[] __initconst = { |
de584afa DW |
969 | { |
970 | enable_cap_knobs, "IBM Active Energy Manager", | |
971 | { | |
972 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
973 | }, | |
974 | }, | |
975 | {} | |
976 | }; | |
977 | ||
978 | static int __init acpi_power_meter_init(void) | |
979 | { | |
980 | int result; | |
981 | ||
982 | if (acpi_disabled) | |
983 | return -ENODEV; | |
984 | ||
985 | dmi_check_system(pm_dmi_table); | |
986 | ||
987 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
988 | if (result < 0) | |
19f053c8 | 989 | return result; |
de584afa DW |
990 | |
991 | return 0; | |
992 | } | |
993 | ||
994 | static void __exit acpi_power_meter_exit(void) | |
995 | { | |
996 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
997 | } | |
998 | ||
5407e051 | 999 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
1000 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
1001 | MODULE_LICENSE("GPL"); | |
1002 | ||
1003 | module_param(force_cap_on, bool, 0644); | |
1004 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1005 | ||
1006 | module_init(acpi_power_meter_init); | |
1007 | module_exit(acpi_power_meter_exit); |