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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" | |
23 | ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); | |
24 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" | |
18262714 | 25 | #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
de584afa DW |
26 | |
27 | #define NUM_SENSORS 17 | |
28 | ||
29 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
30 | #define POWER_METER_CAN_TRIP (1 << 1) | |
31 | #define POWER_METER_CAN_CAP (1 << 2) | |
32 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
33 | #define POWER_METER_IS_BATTERY (1 << 8) | |
34 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
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)) { | |
117 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
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)) { | |
169 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
170 | return -EINVAL; | |
171 | } | |
172 | ||
173 | /* _PAI returns 0 on success, nonzero otherwise */ | |
174 | if (data) | |
175 | return -EINVAL; | |
176 | ||
177 | return count; | |
178 | } | |
179 | ||
180 | /* Cap functions */ | |
181 | static int update_cap(struct acpi_power_meter_resource *resource) | |
182 | { | |
183 | unsigned long long data; | |
184 | acpi_status status; | |
185 | ||
186 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
187 | NULL, &data); | |
188 | if (ACPI_FAILURE(status)) { | |
189 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
190 | return -ENODEV; | |
191 | } | |
192 | ||
193 | resource->cap = data; | |
194 | return 0; | |
195 | } | |
196 | ||
197 | static ssize_t show_cap(struct device *dev, | |
198 | struct device_attribute *devattr, | |
199 | char *buf) | |
200 | { | |
201 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
202 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
203 | ||
204 | mutex_lock(&resource->lock); | |
205 | update_cap(resource); | |
206 | mutex_unlock(&resource->lock); | |
207 | ||
208 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
209 | } | |
210 | ||
211 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
212 | const char *buf, size_t count) | |
213 | { | |
214 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
215 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
216 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
217 | struct acpi_object_list args = { 1, &arg0 }; | |
218 | int res; | |
219 | unsigned long temp; | |
220 | unsigned long long data; | |
221 | acpi_status status; | |
222 | ||
179c4fdb | 223 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
224 | if (res) |
225 | return res; | |
226 | ||
27c4db39 | 227 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
228 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
229 | return -EINVAL; | |
230 | arg0.integer.value = temp; | |
231 | ||
232 | mutex_lock(&resource->lock); | |
233 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
234 | &args, &data); | |
10e92724 | 235 | if (ACPI_SUCCESS(status)) |
de584afa DW |
236 | resource->cap = temp; |
237 | mutex_unlock(&resource->lock); | |
238 | ||
239 | if (ACPI_FAILURE(status)) { | |
240 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | /* _SHL returns 0 on success, nonzero otherwise */ | |
245 | if (data) | |
246 | return -EINVAL; | |
247 | ||
248 | return count; | |
249 | } | |
250 | ||
251 | /* Power meter trip points */ | |
252 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
253 | { | |
254 | union acpi_object arg_objs[] = { | |
255 | {ACPI_TYPE_INTEGER}, | |
256 | {ACPI_TYPE_INTEGER} | |
257 | }; | |
258 | struct acpi_object_list args = { 2, arg_objs }; | |
259 | unsigned long long data; | |
260 | acpi_status status; | |
261 | ||
262 | /* Both trip levels must be set */ | |
263 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
264 | return 0; | |
265 | ||
266 | /* This driver stores min, max; ACPI wants max, min. */ | |
267 | arg_objs[0].integer.value = resource->trip[1]; | |
268 | arg_objs[1].integer.value = resource->trip[0]; | |
269 | ||
270 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
271 | &args, &data); | |
272 | if (ACPI_FAILURE(status)) { | |
273 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
274 | return -EINVAL; | |
275 | } | |
276 | ||
22aecebf DW |
277 | /* _PTP returns 0 on success, nonzero otherwise */ |
278 | if (data) | |
279 | return -EINVAL; | |
280 | ||
281 | return 0; | |
de584afa DW |
282 | } |
283 | ||
284 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
285 | const char *buf, size_t count) | |
286 | { | |
287 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
288 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
289 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
290 | int res; | |
291 | unsigned long temp; | |
292 | ||
179c4fdb | 293 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
294 | if (res) |
295 | return res; | |
296 | ||
27c4db39 | 297 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
298 | |
299 | mutex_lock(&resource->lock); | |
300 | resource->trip[attr->index - 7] = temp; | |
301 | res = set_acpi_trip(resource); | |
302 | mutex_unlock(&resource->lock); | |
303 | ||
304 | if (res) | |
305 | return res; | |
306 | ||
307 | return count; | |
308 | } | |
309 | ||
310 | /* Power meter */ | |
311 | static int update_meter(struct acpi_power_meter_resource *resource) | |
312 | { | |
313 | unsigned long long data; | |
314 | acpi_status status; | |
315 | unsigned long local_jiffies = jiffies; | |
316 | ||
317 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
318 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
319 | resource->sensors_valid) | |
320 | return 0; | |
321 | ||
322 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
323 | NULL, &data); | |
324 | if (ACPI_FAILURE(status)) { | |
325 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
326 | return -ENODEV; | |
327 | } | |
328 | ||
329 | resource->power = data; | |
330 | resource->sensors_valid = 1; | |
331 | resource->sensors_last_updated = jiffies; | |
332 | return 0; | |
333 | } | |
334 | ||
335 | static ssize_t show_power(struct device *dev, | |
336 | struct device_attribute *devattr, | |
337 | char *buf) | |
338 | { | |
339 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
340 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
341 | ||
342 | mutex_lock(&resource->lock); | |
343 | update_meter(resource); | |
344 | mutex_unlock(&resource->lock); | |
345 | ||
346 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
347 | } | |
348 | ||
349 | /* Miscellaneous */ | |
350 | static ssize_t show_str(struct device *dev, | |
351 | struct device_attribute *devattr, | |
352 | char *buf) | |
353 | { | |
354 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
355 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
356 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
357 | acpi_string val; | |
badcd454 | 358 | int ret; |
de584afa | 359 | |
badcd454 | 360 | mutex_lock(&resource->lock); |
de584afa DW |
361 | switch (attr->index) { |
362 | case 0: | |
363 | val = resource->model_number; | |
364 | break; | |
365 | case 1: | |
366 | val = resource->serial_number; | |
367 | break; | |
368 | case 2: | |
369 | val = resource->oem_info; | |
370 | break; | |
371 | default: | |
83c97fe1 GR |
372 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
373 | attr->index); | |
776cdc11 | 374 | val = ""; |
83c97fe1 | 375 | break; |
de584afa | 376 | } |
badcd454 GR |
377 | ret = sprintf(buf, "%s\n", val); |
378 | mutex_unlock(&resource->lock); | |
379 | return ret; | |
de584afa DW |
380 | } |
381 | ||
382 | static ssize_t show_val(struct device *dev, | |
383 | struct device_attribute *devattr, | |
384 | char *buf) | |
385 | { | |
386 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
387 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
388 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 389 | u64 val = 0; |
de584afa DW |
390 | |
391 | switch (attr->index) { | |
392 | case 0: | |
393 | val = resource->caps.min_avg_interval; | |
394 | break; | |
395 | case 1: | |
396 | val = resource->caps.max_avg_interval; | |
397 | break; | |
398 | case 2: | |
399 | val = resource->caps.min_cap * 1000; | |
400 | break; | |
401 | case 3: | |
402 | val = resource->caps.max_cap * 1000; | |
403 | break; | |
404 | case 4: | |
405 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
406 | return sprintf(buf, "unknown\n"); | |
407 | ||
408 | val = resource->caps.hysteresis * 1000; | |
409 | break; | |
410 | case 5: | |
411 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
412 | val = 1; | |
413 | else | |
414 | val = 0; | |
415 | break; | |
416 | case 6: | |
417 | if (resource->power > resource->cap) | |
418 | val = 1; | |
419 | else | |
420 | val = 0; | |
421 | break; | |
422 | case 7: | |
423 | case 8: | |
424 | if (resource->trip[attr->index - 7] < 0) | |
425 | return sprintf(buf, "unknown\n"); | |
426 | ||
427 | val = resource->trip[attr->index - 7] * 1000; | |
428 | break; | |
429 | default: | |
83c97fe1 GR |
430 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
431 | attr->index); | |
432 | break; | |
de584afa DW |
433 | } |
434 | ||
435 | return sprintf(buf, "%llu\n", val); | |
436 | } | |
437 | ||
438 | static ssize_t show_accuracy(struct device *dev, | |
439 | struct device_attribute *devattr, | |
440 | char *buf) | |
441 | { | |
442 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
443 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
444 | unsigned int acc = resource->caps.accuracy; | |
445 | ||
446 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
447 | } | |
448 | ||
449 | static ssize_t show_name(struct device *dev, | |
450 | struct device_attribute *devattr, | |
451 | char *buf) | |
452 | { | |
453 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
454 | } | |
455 | ||
3c45f2c7 KM |
456 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
457 | { \ | |
458 | .label = _label, \ | |
459 | .show = _show, \ | |
460 | .index = _index, \ | |
461 | } | |
462 | ||
463 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
464 | { \ | |
465 | .label = _label, \ | |
466 | .show = _show, \ | |
467 | .set = _set, \ | |
468 | .index = _index, \ | |
469 | } | |
470 | ||
de584afa | 471 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 472 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
473 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
474 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
475 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
476 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
477 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 KM |
478 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
479 | set_avg_interval, 0), | |
81194cd2 | 480 | {}, |
de584afa DW |
481 | }; |
482 | ||
81194cd2 | 483 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
484 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
485 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
486 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
487 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 488 | {}, |
de584afa DW |
489 | }; |
490 | ||
81194cd2 | 491 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 492 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 493 | {}, |
de584afa DW |
494 | }; |
495 | ||
81194cd2 | 496 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 497 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 498 | {}, |
de584afa DW |
499 | }; |
500 | ||
81194cd2 | 501 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
502 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
503 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 504 | {}, |
de584afa DW |
505 | }; |
506 | ||
81194cd2 | 507 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
508 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
509 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
510 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
511 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 512 | {}, |
de584afa DW |
513 | }; |
514 | ||
3c45f2c7 KM |
515 | #undef RO_SENSOR_TEMPLATE |
516 | #undef RW_SENSOR_TEMPLATE | |
517 | ||
de584afa DW |
518 | /* Read power domain data */ |
519 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
520 | { | |
521 | int i; | |
522 | ||
523 | if (!resource->num_domain_devices) | |
524 | return; | |
525 | ||
526 | for (i = 0; i < resource->num_domain_devices; i++) { | |
527 | struct acpi_device *obj = resource->domain_devices[i]; | |
528 | if (!obj) | |
529 | continue; | |
530 | ||
531 | sysfs_remove_link(resource->holders_dir, | |
532 | kobject_name(&obj->dev.kobj)); | |
533 | put_device(&obj->dev); | |
534 | } | |
535 | ||
536 | kfree(resource->domain_devices); | |
537 | kobject_put(resource->holders_dir); | |
7f07a605 | 538 | resource->num_domain_devices = 0; |
de584afa DW |
539 | } |
540 | ||
541 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
542 | { | |
543 | int res = 0; | |
544 | int i; | |
545 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
546 | union acpi_object *pss; | |
547 | acpi_status status; | |
548 | ||
549 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
550 | &buffer); | |
551 | if (ACPI_FAILURE(status)) { | |
552 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
553 | return -ENODEV; | |
554 | } | |
555 | ||
556 | pss = buffer.pointer; | |
557 | if (!pss || | |
558 | pss->type != ACPI_TYPE_PACKAGE) { | |
559 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
560 | "Invalid _PMD data\n"); | |
561 | res = -EFAULT; | |
562 | goto end; | |
563 | } | |
564 | ||
565 | if (!pss->package.count) | |
566 | goto end; | |
567 | ||
6396bb22 KC |
568 | resource->domain_devices = kcalloc(pss->package.count, |
569 | sizeof(struct acpi_device *), | |
570 | GFP_KERNEL); | |
de584afa DW |
571 | if (!resource->domain_devices) { |
572 | res = -ENOMEM; | |
573 | goto end; | |
574 | } | |
575 | ||
576 | resource->holders_dir = kobject_create_and_add("measures", | |
577 | &resource->acpi_dev->dev.kobj); | |
578 | if (!resource->holders_dir) { | |
579 | res = -ENOMEM; | |
580 | goto exit_free; | |
581 | } | |
582 | ||
583 | resource->num_domain_devices = pss->package.count; | |
584 | ||
585 | for (i = 0; i < pss->package.count; i++) { | |
586 | struct acpi_device *obj; | |
587 | union acpi_object *element = &(pss->package.elements[i]); | |
588 | ||
589 | /* Refuse non-references */ | |
590 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
591 | continue; | |
592 | ||
593 | /* Create a symlink to domain objects */ | |
594 | resource->domain_devices[i] = NULL; | |
3a4cbc19 YW |
595 | if (acpi_bus_get_device(element->reference.handle, |
596 | &resource->domain_devices[i])) | |
de584afa DW |
597 | continue; |
598 | ||
599 | obj = resource->domain_devices[i]; | |
600 | get_device(&obj->dev); | |
601 | ||
602 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
603 | kobject_name(&obj->dev.kobj)); | |
604 | if (res) { | |
605 | put_device(&obj->dev); | |
606 | resource->domain_devices[i] = NULL; | |
607 | } | |
608 | } | |
609 | ||
610 | res = 0; | |
611 | goto end; | |
612 | ||
613 | exit_free: | |
614 | kfree(resource->domain_devices); | |
615 | end: | |
616 | kfree(buffer.pointer); | |
617 | return res; | |
618 | } | |
619 | ||
620 | /* Registration and deregistration */ | |
f49d6a7e KM |
621 | static int register_attrs(struct acpi_power_meter_resource *resource, |
622 | struct sensor_template *attrs) | |
de584afa DW |
623 | { |
624 | struct device *dev = &resource->acpi_dev->dev; | |
625 | struct sensor_device_attribute *sensors = | |
626 | &resource->sensors[resource->num_sensors]; | |
627 | int res = 0; | |
628 | ||
f49d6a7e KM |
629 | while (attrs->label) { |
630 | sensors->dev_attr.attr.name = attrs->label; | |
419eeabc | 631 | sensors->dev_attr.attr.mode = 0444; |
f49d6a7e KM |
632 | sensors->dev_attr.show = attrs->show; |
633 | sensors->index = attrs->index; | |
de584afa | 634 | |
f49d6a7e | 635 | if (attrs->set) { |
419eeabc | 636 | sensors->dev_attr.attr.mode |= 0200; |
f49d6a7e | 637 | sensors->dev_attr.store = attrs->set; |
de584afa | 638 | } |
de584afa | 639 | |
31e354ee | 640 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
641 | res = device_create_file(dev, &sensors->dev_attr); |
642 | if (res) { | |
643 | sensors->dev_attr.attr.name = NULL; | |
644 | goto error; | |
645 | } | |
646 | sensors++; | |
647 | resource->num_sensors++; | |
f49d6a7e | 648 | attrs++; |
de584afa DW |
649 | } |
650 | ||
651 | error: | |
652 | return res; | |
653 | } | |
654 | ||
655 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
656 | { | |
657 | int i; | |
658 | ||
659 | for (i = 0; i < resource->num_sensors; i++) { | |
660 | if (!resource->sensors[i].dev_attr.attr.name) | |
661 | continue; | |
662 | device_remove_file(&resource->acpi_dev->dev, | |
663 | &resource->sensors[i].dev_attr); | |
664 | } | |
665 | ||
666 | remove_domain_devices(resource); | |
667 | ||
668 | resource->num_sensors = 0; | |
669 | } | |
670 | ||
671 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
672 | { | |
673 | int res = 0; | |
674 | ||
675 | res = read_domain_devices(resource); | |
676 | if (res) | |
677 | return res; | |
678 | ||
679 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 680 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
681 | if (res) |
682 | goto error; | |
683 | } | |
684 | ||
685 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
686 | if (!can_cap_in_hardware()) { | |
6e4d91aa WS |
687 | dev_warn(&resource->acpi_dev->dev, |
688 | "Ignoring unsafe software power cap!\n"); | |
de584afa DW |
689 | goto skip_unsafe_cap; |
690 | } | |
691 | ||
7bb5ee01 | 692 | if (resource->caps.configurable_cap) |
f49d6a7e | 693 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 694 | else |
f49d6a7e | 695 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
696 | |
697 | if (res) | |
698 | goto error; | |
699 | ||
f49d6a7e | 700 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
701 | if (res) |
702 | goto error; | |
703 | } | |
de584afa | 704 | |
7bb5ee01 | 705 | skip_unsafe_cap: |
de584afa | 706 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 707 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
708 | if (res) |
709 | goto error; | |
710 | } | |
711 | ||
f49d6a7e | 712 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
713 | if (res) |
714 | goto error; | |
715 | ||
716 | return res; | |
717 | error: | |
de584afa DW |
718 | remove_attrs(resource); |
719 | return res; | |
720 | } | |
721 | ||
722 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
723 | { | |
724 | acpi_string *str; | |
725 | int i; | |
726 | ||
727 | str = &resource->model_number; | |
96eca8c9 | 728 | for (i = 0; i < 3; i++, str++) { |
de584afa | 729 | kfree(*str); |
96eca8c9 DC |
730 | *str = NULL; |
731 | } | |
de584afa DW |
732 | } |
733 | ||
734 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
735 | { | |
736 | int res = 0; | |
737 | int i; | |
738 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
739 | struct acpi_buffer state = { 0, NULL }; | |
740 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
741 | union acpi_object *pss; | |
742 | acpi_string *str; | |
743 | acpi_status status; | |
744 | ||
745 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
746 | &buffer); | |
747 | if (ACPI_FAILURE(status)) { | |
748 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
749 | return -ENODEV; | |
750 | } | |
751 | ||
752 | pss = buffer.pointer; | |
753 | if (!pss || | |
754 | pss->type != ACPI_TYPE_PACKAGE || | |
755 | pss->package.count != 14) { | |
756 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
757 | "Invalid _PMC data\n"); | |
758 | res = -EFAULT; | |
759 | goto end; | |
760 | } | |
761 | ||
762 | /* Grab all the integer data at once */ | |
763 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
764 | state.pointer = &resource->caps; | |
765 | ||
766 | status = acpi_extract_package(pss, &format, &state); | |
767 | if (ACPI_FAILURE(status)) { | |
768 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
769 | res = -EFAULT; | |
770 | goto end; | |
771 | } | |
772 | ||
773 | if (resource->caps.units) { | |
774 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
775 | "Unknown units %llu.\n", | |
776 | resource->caps.units); | |
777 | res = -EINVAL; | |
778 | goto end; | |
779 | } | |
780 | ||
781 | /* Grab the string data */ | |
782 | str = &resource->model_number; | |
783 | ||
784 | for (i = 11; i < 14; i++) { | |
785 | union acpi_object *element = &(pss->package.elements[i]); | |
786 | ||
787 | if (element->type != ACPI_TYPE_STRING) { | |
788 | res = -EINVAL; | |
789 | goto error; | |
790 | } | |
791 | ||
6396bb22 | 792 | *str = kcalloc(element->string.length + 1, sizeof(u8), |
de584afa DW |
793 | GFP_KERNEL); |
794 | if (!*str) { | |
795 | res = -ENOMEM; | |
796 | goto error; | |
797 | } | |
798 | ||
799 | strncpy(*str, element->string.pointer, element->string.length); | |
800 | str++; | |
801 | } | |
802 | ||
803 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
804 | goto end; | |
805 | error: | |
96eca8c9 | 806 | free_capabilities(resource); |
de584afa DW |
807 | end: |
808 | kfree(buffer.pointer); | |
809 | return res; | |
810 | } | |
811 | ||
812 | /* Handle ACPI event notifications */ | |
813 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
814 | { | |
815 | struct acpi_power_meter_resource *resource; | |
816 | int res; | |
817 | ||
818 | if (!device || !acpi_driver_data(device)) | |
819 | return; | |
820 | ||
821 | resource = acpi_driver_data(device); | |
822 | ||
de584afa DW |
823 | switch (event) { |
824 | case METER_NOTIFY_CONFIG: | |
badcd454 | 825 | mutex_lock(&resource->lock); |
de584afa DW |
826 | free_capabilities(resource); |
827 | res = read_capabilities(resource); | |
badcd454 | 828 | mutex_unlock(&resource->lock); |
de584afa DW |
829 | if (res) |
830 | break; | |
831 | ||
832 | remove_attrs(resource); | |
833 | setup_attrs(resource); | |
834 | break; | |
835 | case METER_NOTIFY_TRIP: | |
836 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
de584afa DW |
837 | break; |
838 | case METER_NOTIFY_CAP: | |
839 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
de584afa DW |
840 | break; |
841 | case METER_NOTIFY_INTERVAL: | |
842 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
de584afa DW |
843 | break; |
844 | case METER_NOTIFY_CAPPING: | |
845 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
846 | dev_info(&device->dev, "Capping in progress.\n"); | |
847 | break; | |
848 | default: | |
83c97fe1 GR |
849 | WARN(1, "Unexpected event %d\n", event); |
850 | break; | |
de584afa | 851 | } |
de584afa DW |
852 | |
853 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
854 | dev_name(&device->dev), event, 0); | |
855 | } | |
856 | ||
857 | static int acpi_power_meter_add(struct acpi_device *device) | |
858 | { | |
859 | int res; | |
860 | struct acpi_power_meter_resource *resource; | |
861 | ||
862 | if (!device) | |
863 | return -EINVAL; | |
864 | ||
865 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
866 | GFP_KERNEL); | |
867 | if (!resource) | |
868 | return -ENOMEM; | |
869 | ||
870 | resource->sensors_valid = 0; | |
871 | resource->acpi_dev = device; | |
872 | mutex_init(&resource->lock); | |
873 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
874 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
875 | device->driver_data = resource; | |
876 | ||
de584afa DW |
877 | res = read_capabilities(resource); |
878 | if (res) | |
879 | goto exit_free; | |
880 | ||
881 | resource->trip[0] = resource->trip[1] = -1; | |
882 | ||
883 | res = setup_attrs(resource); | |
884 | if (res) | |
8b97f992 | 885 | goto exit_free_capability; |
de584afa DW |
886 | |
887 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
888 | if (IS_ERR(resource->hwmon_dev)) { | |
889 | res = PTR_ERR(resource->hwmon_dev); | |
890 | goto exit_remove; | |
891 | } | |
892 | ||
893 | res = 0; | |
894 | goto exit; | |
895 | ||
896 | exit_remove: | |
897 | remove_attrs(resource); | |
8b97f992 MT |
898 | exit_free_capability: |
899 | free_capabilities(resource); | |
de584afa DW |
900 | exit_free: |
901 | kfree(resource); | |
902 | exit: | |
903 | return res; | |
904 | } | |
905 | ||
51fac838 | 906 | static int acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
907 | { |
908 | struct acpi_power_meter_resource *resource; | |
909 | ||
910 | if (!device || !acpi_driver_data(device)) | |
911 | return -EINVAL; | |
912 | ||
913 | resource = acpi_driver_data(device); | |
914 | hwmon_device_unregister(resource->hwmon_dev); | |
915 | ||
de584afa | 916 | remove_attrs(resource); |
badcd454 | 917 | free_capabilities(resource); |
de584afa DW |
918 | |
919 | kfree(resource); | |
920 | return 0; | |
921 | } | |
922 | ||
9baeb8fd GR |
923 | #ifdef CONFIG_PM_SLEEP |
924 | ||
c5dec018 | 925 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
926 | { |
927 | struct acpi_power_meter_resource *resource; | |
928 | ||
c5dec018 RW |
929 | if (!dev) |
930 | return -EINVAL; | |
931 | ||
932 | resource = acpi_driver_data(to_acpi_device(dev)); | |
933 | if (!resource) | |
de584afa DW |
934 | return -EINVAL; |
935 | ||
de584afa DW |
936 | free_capabilities(resource); |
937 | read_capabilities(resource); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
9baeb8fd GR |
942 | #endif /* CONFIG_PM_SLEEP */ |
943 | ||
c5dec018 RW |
944 | static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); |
945 | ||
de584afa DW |
946 | static struct acpi_driver acpi_power_meter_driver = { |
947 | .name = "power_meter", | |
948 | .class = ACPI_POWER_METER_CLASS, | |
949 | .ids = power_meter_ids, | |
950 | .ops = { | |
951 | .add = acpi_power_meter_add, | |
952 | .remove = acpi_power_meter_remove, | |
de584afa DW |
953 | .notify = acpi_power_meter_notify, |
954 | }, | |
c5dec018 | 955 | .drv.pm = &acpi_power_meter_pm, |
de584afa DW |
956 | }; |
957 | ||
958 | /* Module init/exit routines */ | |
959 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
960 | { | |
961 | cap_in_hardware = 1; | |
962 | return 0; | |
963 | } | |
964 | ||
6faadbbb | 965 | static const struct dmi_system_id pm_dmi_table[] __initconst = { |
de584afa DW |
966 | { |
967 | enable_cap_knobs, "IBM Active Energy Manager", | |
968 | { | |
969 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
970 | }, | |
971 | }, | |
972 | {} | |
973 | }; | |
974 | ||
975 | static int __init acpi_power_meter_init(void) | |
976 | { | |
977 | int result; | |
978 | ||
979 | if (acpi_disabled) | |
980 | return -ENODEV; | |
981 | ||
982 | dmi_check_system(pm_dmi_table); | |
983 | ||
984 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
985 | if (result < 0) | |
19f053c8 | 986 | return result; |
de584afa DW |
987 | |
988 | return 0; | |
989 | } | |
990 | ||
991 | static void __exit acpi_power_meter_exit(void) | |
992 | { | |
993 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
994 | } | |
995 | ||
5407e051 | 996 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
997 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
998 | MODULE_LICENSE("GPL"); | |
999 | ||
1000 | module_param(force_cap_on, bool, 0644); | |
1001 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1002 | ||
1003 | module_init(acpi_power_meter_init); | |
1004 | module_exit(acpi_power_meter_exit); |