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de584afa DW |
1 | /* |
2 | * A hwmon driver for ACPI 4.0 power meters | |
3 | * Copyright (C) 2009 IBM | |
4 | * | |
5407e051 | 5 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
de584afa DW |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/hwmon.h> | |
24 | #include <linux/hwmon-sysfs.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/dmi.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
de584afa DW |
29 | #include <linux/kdev_t.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/time.h> | |
fa845740 | 32 | #include <linux/err.h> |
8b48463f | 33 | #include <linux/acpi.h> |
de584afa DW |
34 | |
35 | #define ACPI_POWER_METER_NAME "power_meter" | |
36 | ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); | |
37 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" | |
18262714 | 38 | #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
de584afa DW |
39 | |
40 | #define NUM_SENSORS 17 | |
41 | ||
42 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
43 | #define POWER_METER_CAN_TRIP (1 << 1) | |
44 | #define POWER_METER_CAN_CAP (1 << 2) | |
45 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
46 | #define POWER_METER_IS_BATTERY (1 << 8) | |
47 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
48 | ||
49 | #define METER_NOTIFY_CONFIG 0x80 | |
50 | #define METER_NOTIFY_TRIP 0x81 | |
51 | #define METER_NOTIFY_CAP 0x82 | |
52 | #define METER_NOTIFY_CAPPING 0x83 | |
53 | #define METER_NOTIFY_INTERVAL 0x84 | |
54 | ||
55 | #define POWER_AVERAGE_NAME "power1_average" | |
56 | #define POWER_CAP_NAME "power1_cap" | |
57 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
58 | #define POWER_ALARM_NAME "power1_alarm" | |
59 | ||
60 | static int cap_in_hardware; | |
90ab5ee9 | 61 | static bool force_cap_on; |
de584afa DW |
62 | |
63 | static int can_cap_in_hardware(void) | |
64 | { | |
65 | return force_cap_on || cap_in_hardware; | |
66 | } | |
67 | ||
c97adf9e | 68 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
69 | {"ACPI000D", 0}, |
70 | {"", 0}, | |
71 | }; | |
72 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
73 | ||
74 | struct acpi_power_meter_capabilities { | |
439913ff LM |
75 | u64 flags; |
76 | u64 units; | |
77 | u64 type; | |
78 | u64 accuracy; | |
79 | u64 sampling_time; | |
80 | u64 min_avg_interval; | |
81 | u64 max_avg_interval; | |
82 | u64 hysteresis; | |
83 | u64 configurable_cap; | |
84 | u64 min_cap; | |
85 | u64 max_cap; | |
de584afa DW |
86 | }; |
87 | ||
88 | struct acpi_power_meter_resource { | |
89 | struct acpi_device *acpi_dev; | |
90 | acpi_bus_id name; | |
91 | struct mutex lock; | |
92 | struct device *hwmon_dev; | |
93 | struct acpi_power_meter_capabilities caps; | |
94 | acpi_string model_number; | |
95 | acpi_string serial_number; | |
96 | acpi_string oem_info; | |
439913ff LM |
97 | u64 power; |
98 | u64 cap; | |
99 | u64 avg_interval; | |
de584afa DW |
100 | int sensors_valid; |
101 | unsigned long sensors_last_updated; | |
102 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
103 | int num_sensors; | |
75311bea | 104 | s64 trip[2]; |
de584afa DW |
105 | int num_domain_devices; |
106 | struct acpi_device **domain_devices; | |
107 | struct kobject *holders_dir; | |
108 | }; | |
109 | ||
81194cd2 | 110 | struct sensor_template { |
de584afa DW |
111 | char *label; |
112 | ssize_t (*show)(struct device *dev, | |
113 | struct device_attribute *devattr, | |
114 | char *buf); | |
115 | ssize_t (*set)(struct device *dev, | |
116 | struct device_attribute *devattr, | |
117 | const char *buf, size_t count); | |
118 | int index; | |
119 | }; | |
120 | ||
121 | /* Averaging interval */ | |
122 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
123 | { | |
124 | unsigned long long data; | |
125 | acpi_status status; | |
126 | ||
127 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
128 | NULL, &data); | |
129 | if (ACPI_FAILURE(status)) { | |
130 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
131 | return -ENODEV; | |
132 | } | |
133 | ||
134 | resource->avg_interval = data; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static ssize_t show_avg_interval(struct device *dev, | |
139 | struct device_attribute *devattr, | |
140 | char *buf) | |
141 | { | |
142 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
143 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
144 | ||
145 | mutex_lock(&resource->lock); | |
146 | update_avg_interval(resource); | |
147 | mutex_unlock(&resource->lock); | |
148 | ||
149 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
150 | } | |
151 | ||
152 | static ssize_t set_avg_interval(struct device *dev, | |
153 | struct device_attribute *devattr, | |
154 | const char *buf, size_t count) | |
155 | { | |
156 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
157 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
158 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
159 | struct acpi_object_list args = { 1, &arg0 }; | |
160 | int res; | |
161 | unsigned long temp; | |
162 | unsigned long long data; | |
163 | acpi_status status; | |
164 | ||
179c4fdb | 165 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
166 | if (res) |
167 | return res; | |
168 | ||
169 | if (temp > resource->caps.max_avg_interval || | |
170 | temp < resource->caps.min_avg_interval) | |
171 | return -EINVAL; | |
172 | arg0.integer.value = temp; | |
173 | ||
174 | mutex_lock(&resource->lock); | |
175 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
176 | &args, &data); | |
177 | if (!ACPI_FAILURE(status)) | |
178 | resource->avg_interval = temp; | |
179 | mutex_unlock(&resource->lock); | |
180 | ||
181 | if (ACPI_FAILURE(status)) { | |
182 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | /* _PAI returns 0 on success, nonzero otherwise */ | |
187 | if (data) | |
188 | return -EINVAL; | |
189 | ||
190 | return count; | |
191 | } | |
192 | ||
193 | /* Cap functions */ | |
194 | static int update_cap(struct acpi_power_meter_resource *resource) | |
195 | { | |
196 | unsigned long long data; | |
197 | acpi_status status; | |
198 | ||
199 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
200 | NULL, &data); | |
201 | if (ACPI_FAILURE(status)) { | |
202 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
203 | return -ENODEV; | |
204 | } | |
205 | ||
206 | resource->cap = data; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | static ssize_t show_cap(struct device *dev, | |
211 | struct device_attribute *devattr, | |
212 | char *buf) | |
213 | { | |
214 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
215 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
216 | ||
217 | mutex_lock(&resource->lock); | |
218 | update_cap(resource); | |
219 | mutex_unlock(&resource->lock); | |
220 | ||
221 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
222 | } | |
223 | ||
224 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
225 | const char *buf, size_t count) | |
226 | { | |
227 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
228 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
229 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
230 | struct acpi_object_list args = { 1, &arg0 }; | |
231 | int res; | |
232 | unsigned long temp; | |
233 | unsigned long long data; | |
234 | acpi_status status; | |
235 | ||
179c4fdb | 236 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
237 | if (res) |
238 | return res; | |
239 | ||
27c4db39 | 240 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
241 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
242 | return -EINVAL; | |
243 | arg0.integer.value = temp; | |
244 | ||
245 | mutex_lock(&resource->lock); | |
246 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
247 | &args, &data); | |
248 | if (!ACPI_FAILURE(status)) | |
249 | resource->cap = temp; | |
250 | mutex_unlock(&resource->lock); | |
251 | ||
252 | if (ACPI_FAILURE(status)) { | |
253 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
257 | /* _SHL returns 0 on success, nonzero otherwise */ | |
258 | if (data) | |
259 | return -EINVAL; | |
260 | ||
261 | return count; | |
262 | } | |
263 | ||
264 | /* Power meter trip points */ | |
265 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
266 | { | |
267 | union acpi_object arg_objs[] = { | |
268 | {ACPI_TYPE_INTEGER}, | |
269 | {ACPI_TYPE_INTEGER} | |
270 | }; | |
271 | struct acpi_object_list args = { 2, arg_objs }; | |
272 | unsigned long long data; | |
273 | acpi_status status; | |
274 | ||
275 | /* Both trip levels must be set */ | |
276 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
277 | return 0; | |
278 | ||
279 | /* This driver stores min, max; ACPI wants max, min. */ | |
280 | arg_objs[0].integer.value = resource->trip[1]; | |
281 | arg_objs[1].integer.value = resource->trip[0]; | |
282 | ||
283 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
284 | &args, &data); | |
285 | if (ACPI_FAILURE(status)) { | |
286 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
287 | return -EINVAL; | |
288 | } | |
289 | ||
22aecebf DW |
290 | /* _PTP returns 0 on success, nonzero otherwise */ |
291 | if (data) | |
292 | return -EINVAL; | |
293 | ||
294 | return 0; | |
de584afa DW |
295 | } |
296 | ||
297 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
298 | const char *buf, size_t count) | |
299 | { | |
300 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
301 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
302 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
303 | int res; | |
304 | unsigned long temp; | |
305 | ||
179c4fdb | 306 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
307 | if (res) |
308 | return res; | |
309 | ||
27c4db39 | 310 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
311 | |
312 | mutex_lock(&resource->lock); | |
313 | resource->trip[attr->index - 7] = temp; | |
314 | res = set_acpi_trip(resource); | |
315 | mutex_unlock(&resource->lock); | |
316 | ||
317 | if (res) | |
318 | return res; | |
319 | ||
320 | return count; | |
321 | } | |
322 | ||
323 | /* Power meter */ | |
324 | static int update_meter(struct acpi_power_meter_resource *resource) | |
325 | { | |
326 | unsigned long long data; | |
327 | acpi_status status; | |
328 | unsigned long local_jiffies = jiffies; | |
329 | ||
330 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
331 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
332 | resource->sensors_valid) | |
333 | return 0; | |
334 | ||
335 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
336 | NULL, &data); | |
337 | if (ACPI_FAILURE(status)) { | |
338 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
339 | return -ENODEV; | |
340 | } | |
341 | ||
342 | resource->power = data; | |
343 | resource->sensors_valid = 1; | |
344 | resource->sensors_last_updated = jiffies; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static ssize_t show_power(struct device *dev, | |
349 | struct device_attribute *devattr, | |
350 | char *buf) | |
351 | { | |
352 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
353 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
354 | ||
355 | mutex_lock(&resource->lock); | |
356 | update_meter(resource); | |
357 | mutex_unlock(&resource->lock); | |
358 | ||
359 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
360 | } | |
361 | ||
362 | /* Miscellaneous */ | |
363 | static ssize_t show_str(struct device *dev, | |
364 | struct device_attribute *devattr, | |
365 | char *buf) | |
366 | { | |
367 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
368 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
369 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
370 | acpi_string val; | |
371 | ||
372 | switch (attr->index) { | |
373 | case 0: | |
374 | val = resource->model_number; | |
375 | break; | |
376 | case 1: | |
377 | val = resource->serial_number; | |
378 | break; | |
379 | case 2: | |
380 | val = resource->oem_info; | |
381 | break; | |
382 | default: | |
83c97fe1 GR |
383 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
384 | attr->index); | |
776cdc11 | 385 | val = ""; |
83c97fe1 | 386 | break; |
de584afa DW |
387 | } |
388 | ||
389 | return sprintf(buf, "%s\n", val); | |
390 | } | |
391 | ||
392 | static ssize_t show_val(struct device *dev, | |
393 | struct device_attribute *devattr, | |
394 | char *buf) | |
395 | { | |
396 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
397 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
398 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 399 | u64 val = 0; |
de584afa DW |
400 | |
401 | switch (attr->index) { | |
402 | case 0: | |
403 | val = resource->caps.min_avg_interval; | |
404 | break; | |
405 | case 1: | |
406 | val = resource->caps.max_avg_interval; | |
407 | break; | |
408 | case 2: | |
409 | val = resource->caps.min_cap * 1000; | |
410 | break; | |
411 | case 3: | |
412 | val = resource->caps.max_cap * 1000; | |
413 | break; | |
414 | case 4: | |
415 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
416 | return sprintf(buf, "unknown\n"); | |
417 | ||
418 | val = resource->caps.hysteresis * 1000; | |
419 | break; | |
420 | case 5: | |
421 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
422 | val = 1; | |
423 | else | |
424 | val = 0; | |
425 | break; | |
426 | case 6: | |
427 | if (resource->power > resource->cap) | |
428 | val = 1; | |
429 | else | |
430 | val = 0; | |
431 | break; | |
432 | case 7: | |
433 | case 8: | |
434 | if (resource->trip[attr->index - 7] < 0) | |
435 | return sprintf(buf, "unknown\n"); | |
436 | ||
437 | val = resource->trip[attr->index - 7] * 1000; | |
438 | break; | |
439 | default: | |
83c97fe1 GR |
440 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
441 | attr->index); | |
442 | break; | |
de584afa DW |
443 | } |
444 | ||
445 | return sprintf(buf, "%llu\n", val); | |
446 | } | |
447 | ||
448 | static ssize_t show_accuracy(struct device *dev, | |
449 | struct device_attribute *devattr, | |
450 | char *buf) | |
451 | { | |
452 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
453 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
454 | unsigned int acc = resource->caps.accuracy; | |
455 | ||
456 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
457 | } | |
458 | ||
459 | static ssize_t show_name(struct device *dev, | |
460 | struct device_attribute *devattr, | |
461 | char *buf) | |
462 | { | |
463 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
464 | } | |
465 | ||
3c45f2c7 KM |
466 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
467 | { \ | |
468 | .label = _label, \ | |
469 | .show = _show, \ | |
470 | .index = _index, \ | |
471 | } | |
472 | ||
473 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
474 | { \ | |
475 | .label = _label, \ | |
476 | .show = _show, \ | |
477 | .set = _set, \ | |
478 | .index = _index, \ | |
479 | } | |
480 | ||
de584afa | 481 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 482 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
483 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
484 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
485 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
486 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
487 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 KM |
488 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
489 | set_avg_interval, 0), | |
81194cd2 | 490 | {}, |
de584afa DW |
491 | }; |
492 | ||
81194cd2 | 493 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
494 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
495 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
496 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
497 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 498 | {}, |
de584afa DW |
499 | }; |
500 | ||
81194cd2 | 501 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 502 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 503 | {}, |
de584afa DW |
504 | }; |
505 | ||
81194cd2 | 506 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 507 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 508 | {}, |
de584afa DW |
509 | }; |
510 | ||
81194cd2 | 511 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
512 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
513 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 514 | {}, |
de584afa DW |
515 | }; |
516 | ||
81194cd2 | 517 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
518 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
519 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
520 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
521 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 522 | {}, |
de584afa DW |
523 | }; |
524 | ||
3c45f2c7 KM |
525 | #undef RO_SENSOR_TEMPLATE |
526 | #undef RW_SENSOR_TEMPLATE | |
527 | ||
de584afa DW |
528 | /* Read power domain data */ |
529 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
530 | { | |
531 | int i; | |
532 | ||
533 | if (!resource->num_domain_devices) | |
534 | return; | |
535 | ||
536 | for (i = 0; i < resource->num_domain_devices; i++) { | |
537 | struct acpi_device *obj = resource->domain_devices[i]; | |
538 | if (!obj) | |
539 | continue; | |
540 | ||
541 | sysfs_remove_link(resource->holders_dir, | |
542 | kobject_name(&obj->dev.kobj)); | |
543 | put_device(&obj->dev); | |
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)) { | |
562 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
563 | return -ENODEV; | |
564 | } | |
565 | ||
566 | pss = buffer.pointer; | |
567 | if (!pss || | |
568 | pss->type != ACPI_TYPE_PACKAGE) { | |
569 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
570 | "Invalid _PMD data\n"); | |
571 | res = -EFAULT; | |
572 | goto end; | |
573 | } | |
574 | ||
575 | if (!pss->package.count) | |
576 | goto end; | |
577 | ||
578 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
579 | pss->package.count, GFP_KERNEL); | |
580 | if (!resource->domain_devices) { | |
581 | res = -ENOMEM; | |
582 | goto end; | |
583 | } | |
584 | ||
585 | resource->holders_dir = kobject_create_and_add("measures", | |
586 | &resource->acpi_dev->dev.kobj); | |
587 | if (!resource->holders_dir) { | |
588 | res = -ENOMEM; | |
589 | goto exit_free; | |
590 | } | |
591 | ||
592 | resource->num_domain_devices = pss->package.count; | |
593 | ||
594 | for (i = 0; i < pss->package.count; i++) { | |
595 | struct acpi_device *obj; | |
596 | union acpi_object *element = &(pss->package.elements[i]); | |
597 | ||
598 | /* Refuse non-references */ | |
599 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
600 | continue; | |
601 | ||
602 | /* Create a symlink to domain objects */ | |
603 | resource->domain_devices[i] = NULL; | |
3a4cbc19 YW |
604 | if (acpi_bus_get_device(element->reference.handle, |
605 | &resource->domain_devices[i])) | |
de584afa DW |
606 | continue; |
607 | ||
608 | obj = resource->domain_devices[i]; | |
609 | get_device(&obj->dev); | |
610 | ||
611 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
612 | kobject_name(&obj->dev.kobj)); | |
613 | if (res) { | |
614 | put_device(&obj->dev); | |
615 | resource->domain_devices[i] = NULL; | |
616 | } | |
617 | } | |
618 | ||
619 | res = 0; | |
620 | goto end; | |
621 | ||
622 | exit_free: | |
623 | kfree(resource->domain_devices); | |
624 | end: | |
625 | kfree(buffer.pointer); | |
626 | return res; | |
627 | } | |
628 | ||
629 | /* Registration and deregistration */ | |
f49d6a7e KM |
630 | static int register_attrs(struct acpi_power_meter_resource *resource, |
631 | struct sensor_template *attrs) | |
de584afa DW |
632 | { |
633 | struct device *dev = &resource->acpi_dev->dev; | |
634 | struct sensor_device_attribute *sensors = | |
635 | &resource->sensors[resource->num_sensors]; | |
636 | int res = 0; | |
637 | ||
f49d6a7e KM |
638 | while (attrs->label) { |
639 | sensors->dev_attr.attr.name = attrs->label; | |
de584afa | 640 | sensors->dev_attr.attr.mode = S_IRUGO; |
f49d6a7e KM |
641 | sensors->dev_attr.show = attrs->show; |
642 | sensors->index = attrs->index; | |
de584afa | 643 | |
f49d6a7e KM |
644 | if (attrs->set) { |
645 | sensors->dev_attr.attr.mode |= S_IWUSR; | |
646 | sensors->dev_attr.store = attrs->set; | |
de584afa | 647 | } |
de584afa | 648 | |
31e354ee | 649 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
650 | res = device_create_file(dev, &sensors->dev_attr); |
651 | if (res) { | |
652 | sensors->dev_attr.attr.name = NULL; | |
653 | goto error; | |
654 | } | |
655 | sensors++; | |
656 | resource->num_sensors++; | |
f49d6a7e | 657 | attrs++; |
de584afa DW |
658 | } |
659 | ||
660 | error: | |
661 | return res; | |
662 | } | |
663 | ||
664 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
665 | { | |
666 | int i; | |
667 | ||
668 | for (i = 0; i < resource->num_sensors; i++) { | |
669 | if (!resource->sensors[i].dev_attr.attr.name) | |
670 | continue; | |
671 | device_remove_file(&resource->acpi_dev->dev, | |
672 | &resource->sensors[i].dev_attr); | |
673 | } | |
674 | ||
675 | remove_domain_devices(resource); | |
676 | ||
677 | resource->num_sensors = 0; | |
678 | } | |
679 | ||
680 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
681 | { | |
682 | int res = 0; | |
683 | ||
684 | res = read_domain_devices(resource); | |
685 | if (res) | |
686 | return res; | |
687 | ||
688 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 689 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
690 | if (res) |
691 | goto error; | |
692 | } | |
693 | ||
694 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
695 | if (!can_cap_in_hardware()) { | |
696 | dev_err(&resource->acpi_dev->dev, | |
697 | "Ignoring unsafe software power cap!\n"); | |
698 | goto skip_unsafe_cap; | |
699 | } | |
700 | ||
7bb5ee01 | 701 | if (resource->caps.configurable_cap) |
f49d6a7e | 702 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 703 | else |
f49d6a7e | 704 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
705 | |
706 | if (res) | |
707 | goto error; | |
708 | ||
f49d6a7e | 709 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
710 | if (res) |
711 | goto error; | |
712 | } | |
de584afa | 713 | |
7bb5ee01 | 714 | skip_unsafe_cap: |
de584afa | 715 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 716 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
717 | if (res) |
718 | goto error; | |
719 | } | |
720 | ||
f49d6a7e | 721 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
722 | if (res) |
723 | goto error; | |
724 | ||
725 | return res; | |
726 | error: | |
de584afa DW |
727 | remove_attrs(resource); |
728 | return res; | |
729 | } | |
730 | ||
731 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
732 | { | |
733 | acpi_string *str; | |
734 | int i; | |
735 | ||
736 | str = &resource->model_number; | |
737 | for (i = 0; i < 3; i++, str++) | |
738 | kfree(*str); | |
739 | } | |
740 | ||
741 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
742 | { | |
743 | int res = 0; | |
744 | int i; | |
745 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
746 | struct acpi_buffer state = { 0, NULL }; | |
747 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
748 | union acpi_object *pss; | |
749 | acpi_string *str; | |
750 | acpi_status status; | |
751 | ||
752 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
753 | &buffer); | |
754 | if (ACPI_FAILURE(status)) { | |
755 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
756 | return -ENODEV; | |
757 | } | |
758 | ||
759 | pss = buffer.pointer; | |
760 | if (!pss || | |
761 | pss->type != ACPI_TYPE_PACKAGE || | |
762 | pss->package.count != 14) { | |
763 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
764 | "Invalid _PMC data\n"); | |
765 | res = -EFAULT; | |
766 | goto end; | |
767 | } | |
768 | ||
769 | /* Grab all the integer data at once */ | |
770 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
771 | state.pointer = &resource->caps; | |
772 | ||
773 | status = acpi_extract_package(pss, &format, &state); | |
774 | if (ACPI_FAILURE(status)) { | |
775 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
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++) { | |
792 | union acpi_object *element = &(pss->package.elements[i]); | |
793 | ||
794 | if (element->type != ACPI_TYPE_STRING) { | |
795 | res = -EINVAL; | |
796 | goto error; | |
797 | } | |
798 | ||
799 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
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: | |
813 | str = &resource->model_number; | |
814 | for (i = 0; i < 3; i++, str++) | |
815 | kfree(*str); | |
816 | end: | |
817 | kfree(buffer.pointer); | |
818 | return res; | |
819 | } | |
820 | ||
821 | /* Handle ACPI event notifications */ | |
822 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
823 | { | |
824 | struct acpi_power_meter_resource *resource; | |
825 | int res; | |
826 | ||
827 | if (!device || !acpi_driver_data(device)) | |
828 | return; | |
829 | ||
830 | resource = acpi_driver_data(device); | |
831 | ||
832 | mutex_lock(&resource->lock); | |
833 | switch (event) { | |
834 | case METER_NOTIFY_CONFIG: | |
835 | free_capabilities(resource); | |
836 | res = read_capabilities(resource); | |
837 | if (res) | |
838 | break; | |
839 | ||
840 | remove_attrs(resource); | |
841 | setup_attrs(resource); | |
842 | break; | |
843 | case METER_NOTIFY_TRIP: | |
844 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
845 | update_meter(resource); | |
846 | break; | |
847 | case METER_NOTIFY_CAP: | |
848 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
849 | update_cap(resource); | |
850 | break; | |
851 | case METER_NOTIFY_INTERVAL: | |
852 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
853 | update_avg_interval(resource); | |
854 | break; | |
855 | case METER_NOTIFY_CAPPING: | |
856 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
857 | dev_info(&device->dev, "Capping in progress.\n"); | |
858 | break; | |
859 | default: | |
83c97fe1 GR |
860 | WARN(1, "Unexpected event %d\n", event); |
861 | break; | |
de584afa DW |
862 | } |
863 | mutex_unlock(&resource->lock); | |
864 | ||
865 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
866 | dev_name(&device->dev), event, 0); | |
867 | } | |
868 | ||
869 | static int acpi_power_meter_add(struct acpi_device *device) | |
870 | { | |
871 | int res; | |
872 | struct acpi_power_meter_resource *resource; | |
873 | ||
874 | if (!device) | |
875 | return -EINVAL; | |
876 | ||
877 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
878 | GFP_KERNEL); | |
879 | if (!resource) | |
880 | return -ENOMEM; | |
881 | ||
882 | resource->sensors_valid = 0; | |
883 | resource->acpi_dev = device; | |
884 | mutex_init(&resource->lock); | |
885 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
886 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
887 | device->driver_data = resource; | |
888 | ||
889 | free_capabilities(resource); | |
890 | res = read_capabilities(resource); | |
891 | if (res) | |
892 | goto exit_free; | |
893 | ||
894 | resource->trip[0] = resource->trip[1] = -1; | |
895 | ||
896 | res = setup_attrs(resource); | |
897 | if (res) | |
898 | goto exit_free; | |
899 | ||
900 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
901 | if (IS_ERR(resource->hwmon_dev)) { | |
902 | res = PTR_ERR(resource->hwmon_dev); | |
903 | goto exit_remove; | |
904 | } | |
905 | ||
906 | res = 0; | |
907 | goto exit; | |
908 | ||
909 | exit_remove: | |
910 | remove_attrs(resource); | |
911 | exit_free: | |
912 | kfree(resource); | |
913 | exit: | |
914 | return res; | |
915 | } | |
916 | ||
51fac838 | 917 | static int acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
918 | { |
919 | struct acpi_power_meter_resource *resource; | |
920 | ||
921 | if (!device || !acpi_driver_data(device)) | |
922 | return -EINVAL; | |
923 | ||
924 | resource = acpi_driver_data(device); | |
925 | hwmon_device_unregister(resource->hwmon_dev); | |
926 | ||
927 | free_capabilities(resource); | |
928 | remove_attrs(resource); | |
929 | ||
930 | kfree(resource); | |
931 | return 0; | |
932 | } | |
933 | ||
9baeb8fd GR |
934 | #ifdef CONFIG_PM_SLEEP |
935 | ||
c5dec018 | 936 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
937 | { |
938 | struct acpi_power_meter_resource *resource; | |
939 | ||
c5dec018 RW |
940 | if (!dev) |
941 | return -EINVAL; | |
942 | ||
943 | resource = acpi_driver_data(to_acpi_device(dev)); | |
944 | if (!resource) | |
de584afa DW |
945 | return -EINVAL; |
946 | ||
de584afa DW |
947 | free_capabilities(resource); |
948 | read_capabilities(resource); | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
9baeb8fd GR |
953 | #endif /* CONFIG_PM_SLEEP */ |
954 | ||
c5dec018 RW |
955 | static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); |
956 | ||
de584afa DW |
957 | static struct acpi_driver acpi_power_meter_driver = { |
958 | .name = "power_meter", | |
959 | .class = ACPI_POWER_METER_CLASS, | |
960 | .ids = power_meter_ids, | |
961 | .ops = { | |
962 | .add = acpi_power_meter_add, | |
963 | .remove = acpi_power_meter_remove, | |
de584afa DW |
964 | .notify = acpi_power_meter_notify, |
965 | }, | |
c5dec018 | 966 | .drv.pm = &acpi_power_meter_pm, |
de584afa DW |
967 | }; |
968 | ||
969 | /* Module init/exit routines */ | |
970 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
971 | { | |
972 | cap_in_hardware = 1; | |
973 | return 0; | |
974 | } | |
975 | ||
976 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
977 | { | |
978 | enable_cap_knobs, "IBM Active Energy Manager", | |
979 | { | |
980 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
981 | }, | |
982 | }, | |
983 | {} | |
984 | }; | |
985 | ||
986 | static int __init acpi_power_meter_init(void) | |
987 | { | |
988 | int result; | |
989 | ||
990 | if (acpi_disabled) | |
991 | return -ENODEV; | |
992 | ||
993 | dmi_check_system(pm_dmi_table); | |
994 | ||
995 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
996 | if (result < 0) | |
19f053c8 | 997 | return result; |
de584afa DW |
998 | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | static void __exit acpi_power_meter_exit(void) | |
1003 | { | |
1004 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1005 | } | |
1006 | ||
5407e051 | 1007 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
1008 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
1009 | MODULE_LICENSE("GPL"); | |
1010 | ||
1011 | module_param(force_cap_on, bool, 0644); | |
1012 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1013 | ||
1014 | module_init(acpi_power_meter_init); | |
1015 | module_exit(acpi_power_meter_exit); |