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de584afa DW |
1 | /* |
2 | * A hwmon driver for ACPI 4.0 power meters | |
3 | * Copyright (C) 2009 IBM | |
4 | * | |
5407e051 | 5 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
de584afa DW |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/hwmon.h> | |
24 | #include <linux/hwmon-sysfs.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/dmi.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
de584afa DW |
29 | #include <linux/kdev_t.h> |
30 | #include <linux/sched.h> | |
31 | #include <linux/time.h> | |
fa845740 | 32 | #include <linux/err.h> |
de584afa DW |
33 | #include <acpi/acpi_drivers.h> |
34 | #include <acpi/acpi_bus.h> | |
35 | ||
36 | #define ACPI_POWER_METER_NAME "power_meter" | |
37 | ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); | |
38 | #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" | |
18262714 | 39 | #define ACPI_POWER_METER_CLASS "pwr_meter_resource" |
de584afa DW |
40 | |
41 | #define NUM_SENSORS 17 | |
42 | ||
43 | #define POWER_METER_CAN_MEASURE (1 << 0) | |
44 | #define POWER_METER_CAN_TRIP (1 << 1) | |
45 | #define POWER_METER_CAN_CAP (1 << 2) | |
46 | #define POWER_METER_CAN_NOTIFY (1 << 3) | |
47 | #define POWER_METER_IS_BATTERY (1 << 8) | |
48 | #define UNKNOWN_HYSTERESIS 0xFFFFFFFF | |
49 | ||
50 | #define METER_NOTIFY_CONFIG 0x80 | |
51 | #define METER_NOTIFY_TRIP 0x81 | |
52 | #define METER_NOTIFY_CAP 0x82 | |
53 | #define METER_NOTIFY_CAPPING 0x83 | |
54 | #define METER_NOTIFY_INTERVAL 0x84 | |
55 | ||
56 | #define POWER_AVERAGE_NAME "power1_average" | |
57 | #define POWER_CAP_NAME "power1_cap" | |
58 | #define POWER_AVG_INTERVAL_NAME "power1_average_interval" | |
59 | #define POWER_ALARM_NAME "power1_alarm" | |
60 | ||
61 | static int cap_in_hardware; | |
90ab5ee9 | 62 | static bool force_cap_on; |
de584afa DW |
63 | |
64 | static int can_cap_in_hardware(void) | |
65 | { | |
66 | return force_cap_on || cap_in_hardware; | |
67 | } | |
68 | ||
c97adf9e | 69 | static const struct acpi_device_id power_meter_ids[] = { |
de584afa DW |
70 | {"ACPI000D", 0}, |
71 | {"", 0}, | |
72 | }; | |
73 | MODULE_DEVICE_TABLE(acpi, power_meter_ids); | |
74 | ||
75 | struct acpi_power_meter_capabilities { | |
439913ff LM |
76 | u64 flags; |
77 | u64 units; | |
78 | u64 type; | |
79 | u64 accuracy; | |
80 | u64 sampling_time; | |
81 | u64 min_avg_interval; | |
82 | u64 max_avg_interval; | |
83 | u64 hysteresis; | |
84 | u64 configurable_cap; | |
85 | u64 min_cap; | |
86 | u64 max_cap; | |
de584afa DW |
87 | }; |
88 | ||
89 | struct acpi_power_meter_resource { | |
90 | struct acpi_device *acpi_dev; | |
91 | acpi_bus_id name; | |
92 | struct mutex lock; | |
93 | struct device *hwmon_dev; | |
94 | struct acpi_power_meter_capabilities caps; | |
95 | acpi_string model_number; | |
96 | acpi_string serial_number; | |
97 | acpi_string oem_info; | |
439913ff LM |
98 | u64 power; |
99 | u64 cap; | |
100 | u64 avg_interval; | |
de584afa DW |
101 | int sensors_valid; |
102 | unsigned long sensors_last_updated; | |
103 | struct sensor_device_attribute sensors[NUM_SENSORS]; | |
104 | int num_sensors; | |
75311bea | 105 | s64 trip[2]; |
de584afa DW |
106 | int num_domain_devices; |
107 | struct acpi_device **domain_devices; | |
108 | struct kobject *holders_dir; | |
109 | }; | |
110 | ||
81194cd2 | 111 | struct sensor_template { |
de584afa DW |
112 | char *label; |
113 | ssize_t (*show)(struct device *dev, | |
114 | struct device_attribute *devattr, | |
115 | char *buf); | |
116 | ssize_t (*set)(struct device *dev, | |
117 | struct device_attribute *devattr, | |
118 | const char *buf, size_t count); | |
119 | int index; | |
120 | }; | |
121 | ||
122 | /* Averaging interval */ | |
123 | static int update_avg_interval(struct acpi_power_meter_resource *resource) | |
124 | { | |
125 | unsigned long long data; | |
126 | acpi_status status; | |
127 | ||
128 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", | |
129 | NULL, &data); | |
130 | if (ACPI_FAILURE(status)) { | |
131 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); | |
132 | return -ENODEV; | |
133 | } | |
134 | ||
135 | resource->avg_interval = data; | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static ssize_t show_avg_interval(struct device *dev, | |
140 | struct device_attribute *devattr, | |
141 | char *buf) | |
142 | { | |
143 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
144 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
145 | ||
146 | mutex_lock(&resource->lock); | |
147 | update_avg_interval(resource); | |
148 | mutex_unlock(&resource->lock); | |
149 | ||
150 | return sprintf(buf, "%llu\n", resource->avg_interval); | |
151 | } | |
152 | ||
153 | static ssize_t set_avg_interval(struct device *dev, | |
154 | struct device_attribute *devattr, | |
155 | const char *buf, size_t count) | |
156 | { | |
157 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
158 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
159 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
160 | struct acpi_object_list args = { 1, &arg0 }; | |
161 | int res; | |
162 | unsigned long temp; | |
163 | unsigned long long data; | |
164 | acpi_status status; | |
165 | ||
179c4fdb | 166 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
167 | if (res) |
168 | return res; | |
169 | ||
170 | if (temp > resource->caps.max_avg_interval || | |
171 | temp < resource->caps.min_avg_interval) | |
172 | return -EINVAL; | |
173 | arg0.integer.value = temp; | |
174 | ||
175 | mutex_lock(&resource->lock); | |
176 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", | |
177 | &args, &data); | |
178 | if (!ACPI_FAILURE(status)) | |
179 | resource->avg_interval = temp; | |
180 | mutex_unlock(&resource->lock); | |
181 | ||
182 | if (ACPI_FAILURE(status)) { | |
183 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | /* _PAI returns 0 on success, nonzero otherwise */ | |
188 | if (data) | |
189 | return -EINVAL; | |
190 | ||
191 | return count; | |
192 | } | |
193 | ||
194 | /* Cap functions */ | |
195 | static int update_cap(struct acpi_power_meter_resource *resource) | |
196 | { | |
197 | unsigned long long data; | |
198 | acpi_status status; | |
199 | ||
200 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", | |
201 | NULL, &data); | |
202 | if (ACPI_FAILURE(status)) { | |
203 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); | |
204 | return -ENODEV; | |
205 | } | |
206 | ||
207 | resource->cap = data; | |
208 | return 0; | |
209 | } | |
210 | ||
211 | static ssize_t show_cap(struct device *dev, | |
212 | struct device_attribute *devattr, | |
213 | char *buf) | |
214 | { | |
215 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
216 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
217 | ||
218 | mutex_lock(&resource->lock); | |
219 | update_cap(resource); | |
220 | mutex_unlock(&resource->lock); | |
221 | ||
222 | return sprintf(buf, "%llu\n", resource->cap * 1000); | |
223 | } | |
224 | ||
225 | static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, | |
226 | const char *buf, size_t count) | |
227 | { | |
228 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
229 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
230 | union acpi_object arg0 = { ACPI_TYPE_INTEGER }; | |
231 | struct acpi_object_list args = { 1, &arg0 }; | |
232 | int res; | |
233 | unsigned long temp; | |
234 | unsigned long long data; | |
235 | acpi_status status; | |
236 | ||
179c4fdb | 237 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
238 | if (res) |
239 | return res; | |
240 | ||
27c4db39 | 241 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
242 | if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) |
243 | return -EINVAL; | |
244 | arg0.integer.value = temp; | |
245 | ||
246 | mutex_lock(&resource->lock); | |
247 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", | |
248 | &args, &data); | |
249 | if (!ACPI_FAILURE(status)) | |
250 | resource->cap = temp; | |
251 | mutex_unlock(&resource->lock); | |
252 | ||
253 | if (ACPI_FAILURE(status)) { | |
254 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); | |
255 | return -EINVAL; | |
256 | } | |
257 | ||
258 | /* _SHL returns 0 on success, nonzero otherwise */ | |
259 | if (data) | |
260 | return -EINVAL; | |
261 | ||
262 | return count; | |
263 | } | |
264 | ||
265 | /* Power meter trip points */ | |
266 | static int set_acpi_trip(struct acpi_power_meter_resource *resource) | |
267 | { | |
268 | union acpi_object arg_objs[] = { | |
269 | {ACPI_TYPE_INTEGER}, | |
270 | {ACPI_TYPE_INTEGER} | |
271 | }; | |
272 | struct acpi_object_list args = { 2, arg_objs }; | |
273 | unsigned long long data; | |
274 | acpi_status status; | |
275 | ||
276 | /* Both trip levels must be set */ | |
277 | if (resource->trip[0] < 0 || resource->trip[1] < 0) | |
278 | return 0; | |
279 | ||
280 | /* This driver stores min, max; ACPI wants max, min. */ | |
281 | arg_objs[0].integer.value = resource->trip[1]; | |
282 | arg_objs[1].integer.value = resource->trip[0]; | |
283 | ||
284 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", | |
285 | &args, &data); | |
286 | if (ACPI_FAILURE(status)) { | |
287 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
22aecebf DW |
291 | /* _PTP returns 0 on success, nonzero otherwise */ |
292 | if (data) | |
293 | return -EINVAL; | |
294 | ||
295 | return 0; | |
de584afa DW |
296 | } |
297 | ||
298 | static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, | |
299 | const char *buf, size_t count) | |
300 | { | |
301 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
302 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
303 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
304 | int res; | |
305 | unsigned long temp; | |
306 | ||
179c4fdb | 307 | res = kstrtoul(buf, 10, &temp); |
de584afa DW |
308 | if (res) |
309 | return res; | |
310 | ||
27c4db39 | 311 | temp = DIV_ROUND_CLOSEST(temp, 1000); |
de584afa DW |
312 | |
313 | mutex_lock(&resource->lock); | |
314 | resource->trip[attr->index - 7] = temp; | |
315 | res = set_acpi_trip(resource); | |
316 | mutex_unlock(&resource->lock); | |
317 | ||
318 | if (res) | |
319 | return res; | |
320 | ||
321 | return count; | |
322 | } | |
323 | ||
324 | /* Power meter */ | |
325 | static int update_meter(struct acpi_power_meter_resource *resource) | |
326 | { | |
327 | unsigned long long data; | |
328 | acpi_status status; | |
329 | unsigned long local_jiffies = jiffies; | |
330 | ||
331 | if (time_before(local_jiffies, resource->sensors_last_updated + | |
332 | msecs_to_jiffies(resource->caps.sampling_time)) && | |
333 | resource->sensors_valid) | |
334 | return 0; | |
335 | ||
336 | status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", | |
337 | NULL, &data); | |
338 | if (ACPI_FAILURE(status)) { | |
339 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); | |
340 | return -ENODEV; | |
341 | } | |
342 | ||
343 | resource->power = data; | |
344 | resource->sensors_valid = 1; | |
345 | resource->sensors_last_updated = jiffies; | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static ssize_t show_power(struct device *dev, | |
350 | struct device_attribute *devattr, | |
351 | char *buf) | |
352 | { | |
353 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
354 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
355 | ||
356 | mutex_lock(&resource->lock); | |
357 | update_meter(resource); | |
358 | mutex_unlock(&resource->lock); | |
359 | ||
360 | return sprintf(buf, "%llu\n", resource->power * 1000); | |
361 | } | |
362 | ||
363 | /* Miscellaneous */ | |
364 | static ssize_t show_str(struct device *dev, | |
365 | struct device_attribute *devattr, | |
366 | char *buf) | |
367 | { | |
368 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
369 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
370 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
371 | acpi_string val; | |
372 | ||
373 | switch (attr->index) { | |
374 | case 0: | |
375 | val = resource->model_number; | |
376 | break; | |
377 | case 1: | |
378 | val = resource->serial_number; | |
379 | break; | |
380 | case 2: | |
381 | val = resource->oem_info; | |
382 | break; | |
383 | default: | |
83c97fe1 GR |
384 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
385 | attr->index); | |
776cdc11 | 386 | val = ""; |
83c97fe1 | 387 | break; |
de584afa DW |
388 | } |
389 | ||
390 | return sprintf(buf, "%s\n", val); | |
391 | } | |
392 | ||
393 | static ssize_t show_val(struct device *dev, | |
394 | struct device_attribute *devattr, | |
395 | char *buf) | |
396 | { | |
397 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
398 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
399 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
439913ff | 400 | u64 val = 0; |
de584afa DW |
401 | |
402 | switch (attr->index) { | |
403 | case 0: | |
404 | val = resource->caps.min_avg_interval; | |
405 | break; | |
406 | case 1: | |
407 | val = resource->caps.max_avg_interval; | |
408 | break; | |
409 | case 2: | |
410 | val = resource->caps.min_cap * 1000; | |
411 | break; | |
412 | case 3: | |
413 | val = resource->caps.max_cap * 1000; | |
414 | break; | |
415 | case 4: | |
416 | if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) | |
417 | return sprintf(buf, "unknown\n"); | |
418 | ||
419 | val = resource->caps.hysteresis * 1000; | |
420 | break; | |
421 | case 5: | |
422 | if (resource->caps.flags & POWER_METER_IS_BATTERY) | |
423 | val = 1; | |
424 | else | |
425 | val = 0; | |
426 | break; | |
427 | case 6: | |
428 | if (resource->power > resource->cap) | |
429 | val = 1; | |
430 | else | |
431 | val = 0; | |
432 | break; | |
433 | case 7: | |
434 | case 8: | |
435 | if (resource->trip[attr->index - 7] < 0) | |
436 | return sprintf(buf, "unknown\n"); | |
437 | ||
438 | val = resource->trip[attr->index - 7] * 1000; | |
439 | break; | |
440 | default: | |
83c97fe1 GR |
441 | WARN(1, "Implementation error: unexpected attribute index %d\n", |
442 | attr->index); | |
443 | break; | |
de584afa DW |
444 | } |
445 | ||
446 | return sprintf(buf, "%llu\n", val); | |
447 | } | |
448 | ||
449 | static ssize_t show_accuracy(struct device *dev, | |
450 | struct device_attribute *devattr, | |
451 | char *buf) | |
452 | { | |
453 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
454 | struct acpi_power_meter_resource *resource = acpi_dev->driver_data; | |
455 | unsigned int acc = resource->caps.accuracy; | |
456 | ||
457 | return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); | |
458 | } | |
459 | ||
460 | static ssize_t show_name(struct device *dev, | |
461 | struct device_attribute *devattr, | |
462 | char *buf) | |
463 | { | |
464 | return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); | |
465 | } | |
466 | ||
3c45f2c7 KM |
467 | #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ |
468 | { \ | |
469 | .label = _label, \ | |
470 | .show = _show, \ | |
471 | .index = _index, \ | |
472 | } | |
473 | ||
474 | #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ | |
475 | { \ | |
476 | .label = _label, \ | |
477 | .show = _show, \ | |
478 | .set = _set, \ | |
479 | .index = _index, \ | |
480 | } | |
481 | ||
de584afa | 482 | /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ |
9fe789f8 | 483 | static struct sensor_template meter_attrs[] = { |
3c45f2c7 KM |
484 | RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), |
485 | RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), | |
486 | RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), | |
487 | RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), | |
488 | RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), | |
3c45f2c7 KM |
489 | RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, |
490 | set_avg_interval, 0), | |
81194cd2 | 491 | {}, |
de584afa DW |
492 | }; |
493 | ||
81194cd2 | 494 | static struct sensor_template misc_cap_attrs[] = { |
3c45f2c7 KM |
495 | RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), |
496 | RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), | |
497 | RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), | |
498 | RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), | |
81194cd2 | 499 | {}, |
de584afa DW |
500 | }; |
501 | ||
81194cd2 | 502 | static struct sensor_template ro_cap_attrs[] = { |
3c45f2c7 | 503 | RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), |
81194cd2 | 504 | {}, |
de584afa DW |
505 | }; |
506 | ||
81194cd2 | 507 | static struct sensor_template rw_cap_attrs[] = { |
3c45f2c7 | 508 | RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), |
81194cd2 | 509 | {}, |
de584afa DW |
510 | }; |
511 | ||
81194cd2 | 512 | static struct sensor_template trip_attrs[] = { |
3c45f2c7 KM |
513 | RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), |
514 | RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), | |
81194cd2 | 515 | {}, |
de584afa DW |
516 | }; |
517 | ||
81194cd2 | 518 | static struct sensor_template misc_attrs[] = { |
3c45f2c7 KM |
519 | RO_SENSOR_TEMPLATE("name", show_name, 0), |
520 | RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), | |
521 | RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), | |
522 | RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), | |
81194cd2 | 523 | {}, |
de584afa DW |
524 | }; |
525 | ||
3c45f2c7 KM |
526 | #undef RO_SENSOR_TEMPLATE |
527 | #undef RW_SENSOR_TEMPLATE | |
528 | ||
de584afa DW |
529 | /* Read power domain data */ |
530 | static void remove_domain_devices(struct acpi_power_meter_resource *resource) | |
531 | { | |
532 | int i; | |
533 | ||
534 | if (!resource->num_domain_devices) | |
535 | return; | |
536 | ||
537 | for (i = 0; i < resource->num_domain_devices; i++) { | |
538 | struct acpi_device *obj = resource->domain_devices[i]; | |
539 | if (!obj) | |
540 | continue; | |
541 | ||
542 | sysfs_remove_link(resource->holders_dir, | |
543 | kobject_name(&obj->dev.kobj)); | |
544 | put_device(&obj->dev); | |
545 | } | |
546 | ||
547 | kfree(resource->domain_devices); | |
548 | kobject_put(resource->holders_dir); | |
7f07a605 | 549 | resource->num_domain_devices = 0; |
de584afa DW |
550 | } |
551 | ||
552 | static int read_domain_devices(struct acpi_power_meter_resource *resource) | |
553 | { | |
554 | int res = 0; | |
555 | int i; | |
556 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
557 | union acpi_object *pss; | |
558 | acpi_status status; | |
559 | ||
560 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, | |
561 | &buffer); | |
562 | if (ACPI_FAILURE(status)) { | |
563 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); | |
564 | return -ENODEV; | |
565 | } | |
566 | ||
567 | pss = buffer.pointer; | |
568 | if (!pss || | |
569 | pss->type != ACPI_TYPE_PACKAGE) { | |
570 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
571 | "Invalid _PMD data\n"); | |
572 | res = -EFAULT; | |
573 | goto end; | |
574 | } | |
575 | ||
576 | if (!pss->package.count) | |
577 | goto end; | |
578 | ||
579 | resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * | |
580 | pss->package.count, GFP_KERNEL); | |
581 | if (!resource->domain_devices) { | |
582 | res = -ENOMEM; | |
583 | goto end; | |
584 | } | |
585 | ||
586 | resource->holders_dir = kobject_create_and_add("measures", | |
587 | &resource->acpi_dev->dev.kobj); | |
588 | if (!resource->holders_dir) { | |
589 | res = -ENOMEM; | |
590 | goto exit_free; | |
591 | } | |
592 | ||
593 | resource->num_domain_devices = pss->package.count; | |
594 | ||
595 | for (i = 0; i < pss->package.count; i++) { | |
596 | struct acpi_device *obj; | |
597 | union acpi_object *element = &(pss->package.elements[i]); | |
598 | ||
599 | /* Refuse non-references */ | |
600 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) | |
601 | continue; | |
602 | ||
603 | /* Create a symlink to domain objects */ | |
604 | resource->domain_devices[i] = NULL; | |
605 | status = acpi_bus_get_device(element->reference.handle, | |
606 | &resource->domain_devices[i]); | |
607 | if (ACPI_FAILURE(status)) | |
608 | continue; | |
609 | ||
610 | obj = resource->domain_devices[i]; | |
611 | get_device(&obj->dev); | |
612 | ||
613 | res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, | |
614 | kobject_name(&obj->dev.kobj)); | |
615 | if (res) { | |
616 | put_device(&obj->dev); | |
617 | resource->domain_devices[i] = NULL; | |
618 | } | |
619 | } | |
620 | ||
621 | res = 0; | |
622 | goto end; | |
623 | ||
624 | exit_free: | |
625 | kfree(resource->domain_devices); | |
626 | end: | |
627 | kfree(buffer.pointer); | |
628 | return res; | |
629 | } | |
630 | ||
631 | /* Registration and deregistration */ | |
f49d6a7e KM |
632 | static int register_attrs(struct acpi_power_meter_resource *resource, |
633 | struct sensor_template *attrs) | |
de584afa DW |
634 | { |
635 | struct device *dev = &resource->acpi_dev->dev; | |
636 | struct sensor_device_attribute *sensors = | |
637 | &resource->sensors[resource->num_sensors]; | |
638 | int res = 0; | |
639 | ||
f49d6a7e KM |
640 | while (attrs->label) { |
641 | sensors->dev_attr.attr.name = attrs->label; | |
de584afa | 642 | sensors->dev_attr.attr.mode = S_IRUGO; |
f49d6a7e KM |
643 | sensors->dev_attr.show = attrs->show; |
644 | sensors->index = attrs->index; | |
de584afa | 645 | |
f49d6a7e KM |
646 | if (attrs->set) { |
647 | sensors->dev_attr.attr.mode |= S_IWUSR; | |
648 | sensors->dev_attr.store = attrs->set; | |
de584afa | 649 | } |
de584afa | 650 | |
31e354ee | 651 | sysfs_attr_init(&sensors->dev_attr.attr); |
de584afa DW |
652 | res = device_create_file(dev, &sensors->dev_attr); |
653 | if (res) { | |
654 | sensors->dev_attr.attr.name = NULL; | |
655 | goto error; | |
656 | } | |
657 | sensors++; | |
658 | resource->num_sensors++; | |
f49d6a7e | 659 | attrs++; |
de584afa DW |
660 | } |
661 | ||
662 | error: | |
663 | return res; | |
664 | } | |
665 | ||
666 | static void remove_attrs(struct acpi_power_meter_resource *resource) | |
667 | { | |
668 | int i; | |
669 | ||
670 | for (i = 0; i < resource->num_sensors; i++) { | |
671 | if (!resource->sensors[i].dev_attr.attr.name) | |
672 | continue; | |
673 | device_remove_file(&resource->acpi_dev->dev, | |
674 | &resource->sensors[i].dev_attr); | |
675 | } | |
676 | ||
677 | remove_domain_devices(resource); | |
678 | ||
679 | resource->num_sensors = 0; | |
680 | } | |
681 | ||
682 | static int setup_attrs(struct acpi_power_meter_resource *resource) | |
683 | { | |
684 | int res = 0; | |
685 | ||
686 | res = read_domain_devices(resource); | |
687 | if (res) | |
688 | return res; | |
689 | ||
690 | if (resource->caps.flags & POWER_METER_CAN_MEASURE) { | |
9fe789f8 | 691 | res = register_attrs(resource, meter_attrs); |
de584afa DW |
692 | if (res) |
693 | goto error; | |
694 | } | |
695 | ||
696 | if (resource->caps.flags & POWER_METER_CAN_CAP) { | |
697 | if (!can_cap_in_hardware()) { | |
698 | dev_err(&resource->acpi_dev->dev, | |
699 | "Ignoring unsafe software power cap!\n"); | |
700 | goto skip_unsafe_cap; | |
701 | } | |
702 | ||
7bb5ee01 | 703 | if (resource->caps.configurable_cap) |
f49d6a7e | 704 | res = register_attrs(resource, rw_cap_attrs); |
7bb5ee01 | 705 | else |
f49d6a7e | 706 | res = register_attrs(resource, ro_cap_attrs); |
7bb5ee01 KM |
707 | |
708 | if (res) | |
709 | goto error; | |
710 | ||
f49d6a7e | 711 | res = register_attrs(resource, misc_cap_attrs); |
de584afa DW |
712 | if (res) |
713 | goto error; | |
714 | } | |
de584afa | 715 | |
7bb5ee01 | 716 | skip_unsafe_cap: |
de584afa | 717 | if (resource->caps.flags & POWER_METER_CAN_TRIP) { |
f49d6a7e | 718 | res = register_attrs(resource, trip_attrs); |
de584afa DW |
719 | if (res) |
720 | goto error; | |
721 | } | |
722 | ||
f49d6a7e | 723 | res = register_attrs(resource, misc_attrs); |
de584afa DW |
724 | if (res) |
725 | goto error; | |
726 | ||
727 | return res; | |
728 | error: | |
de584afa DW |
729 | remove_attrs(resource); |
730 | return res; | |
731 | } | |
732 | ||
733 | static void free_capabilities(struct acpi_power_meter_resource *resource) | |
734 | { | |
735 | acpi_string *str; | |
736 | int i; | |
737 | ||
738 | str = &resource->model_number; | |
739 | for (i = 0; i < 3; i++, str++) | |
740 | kfree(*str); | |
741 | } | |
742 | ||
743 | static int read_capabilities(struct acpi_power_meter_resource *resource) | |
744 | { | |
745 | int res = 0; | |
746 | int i; | |
747 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
748 | struct acpi_buffer state = { 0, NULL }; | |
749 | struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; | |
750 | union acpi_object *pss; | |
751 | acpi_string *str; | |
752 | acpi_status status; | |
753 | ||
754 | status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, | |
755 | &buffer); | |
756 | if (ACPI_FAILURE(status)) { | |
757 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); | |
758 | return -ENODEV; | |
759 | } | |
760 | ||
761 | pss = buffer.pointer; | |
762 | if (!pss || | |
763 | pss->type != ACPI_TYPE_PACKAGE || | |
764 | pss->package.count != 14) { | |
765 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
766 | "Invalid _PMC data\n"); | |
767 | res = -EFAULT; | |
768 | goto end; | |
769 | } | |
770 | ||
771 | /* Grab all the integer data at once */ | |
772 | state.length = sizeof(struct acpi_power_meter_capabilities); | |
773 | state.pointer = &resource->caps; | |
774 | ||
775 | status = acpi_extract_package(pss, &format, &state); | |
776 | if (ACPI_FAILURE(status)) { | |
777 | ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); | |
778 | res = -EFAULT; | |
779 | goto end; | |
780 | } | |
781 | ||
782 | if (resource->caps.units) { | |
783 | dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME | |
784 | "Unknown units %llu.\n", | |
785 | resource->caps.units); | |
786 | res = -EINVAL; | |
787 | goto end; | |
788 | } | |
789 | ||
790 | /* Grab the string data */ | |
791 | str = &resource->model_number; | |
792 | ||
793 | for (i = 11; i < 14; i++) { | |
794 | union acpi_object *element = &(pss->package.elements[i]); | |
795 | ||
796 | if (element->type != ACPI_TYPE_STRING) { | |
797 | res = -EINVAL; | |
798 | goto error; | |
799 | } | |
800 | ||
801 | *str = kzalloc(sizeof(u8) * (element->string.length + 1), | |
802 | GFP_KERNEL); | |
803 | if (!*str) { | |
804 | res = -ENOMEM; | |
805 | goto error; | |
806 | } | |
807 | ||
808 | strncpy(*str, element->string.pointer, element->string.length); | |
809 | str++; | |
810 | } | |
811 | ||
812 | dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); | |
813 | goto end; | |
814 | error: | |
815 | str = &resource->model_number; | |
816 | for (i = 0; i < 3; i++, str++) | |
817 | kfree(*str); | |
818 | end: | |
819 | kfree(buffer.pointer); | |
820 | return res; | |
821 | } | |
822 | ||
823 | /* Handle ACPI event notifications */ | |
824 | static void acpi_power_meter_notify(struct acpi_device *device, u32 event) | |
825 | { | |
826 | struct acpi_power_meter_resource *resource; | |
827 | int res; | |
828 | ||
829 | if (!device || !acpi_driver_data(device)) | |
830 | return; | |
831 | ||
832 | resource = acpi_driver_data(device); | |
833 | ||
834 | mutex_lock(&resource->lock); | |
835 | switch (event) { | |
836 | case METER_NOTIFY_CONFIG: | |
837 | free_capabilities(resource); | |
838 | res = read_capabilities(resource); | |
839 | if (res) | |
840 | break; | |
841 | ||
842 | remove_attrs(resource); | |
843 | setup_attrs(resource); | |
844 | break; | |
845 | case METER_NOTIFY_TRIP: | |
846 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); | |
847 | update_meter(resource); | |
848 | break; | |
849 | case METER_NOTIFY_CAP: | |
850 | sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); | |
851 | update_cap(resource); | |
852 | break; | |
853 | case METER_NOTIFY_INTERVAL: | |
854 | sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); | |
855 | update_avg_interval(resource); | |
856 | break; | |
857 | case METER_NOTIFY_CAPPING: | |
858 | sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); | |
859 | dev_info(&device->dev, "Capping in progress.\n"); | |
860 | break; | |
861 | default: | |
83c97fe1 GR |
862 | WARN(1, "Unexpected event %d\n", event); |
863 | break; | |
de584afa DW |
864 | } |
865 | mutex_unlock(&resource->lock); | |
866 | ||
867 | acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, | |
868 | dev_name(&device->dev), event, 0); | |
869 | } | |
870 | ||
871 | static int acpi_power_meter_add(struct acpi_device *device) | |
872 | { | |
873 | int res; | |
874 | struct acpi_power_meter_resource *resource; | |
875 | ||
876 | if (!device) | |
877 | return -EINVAL; | |
878 | ||
879 | resource = kzalloc(sizeof(struct acpi_power_meter_resource), | |
880 | GFP_KERNEL); | |
881 | if (!resource) | |
882 | return -ENOMEM; | |
883 | ||
884 | resource->sensors_valid = 0; | |
885 | resource->acpi_dev = device; | |
886 | mutex_init(&resource->lock); | |
887 | strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); | |
888 | strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); | |
889 | device->driver_data = resource; | |
890 | ||
891 | free_capabilities(resource); | |
892 | res = read_capabilities(resource); | |
893 | if (res) | |
894 | goto exit_free; | |
895 | ||
896 | resource->trip[0] = resource->trip[1] = -1; | |
897 | ||
898 | res = setup_attrs(resource); | |
899 | if (res) | |
900 | goto exit_free; | |
901 | ||
902 | resource->hwmon_dev = hwmon_device_register(&device->dev); | |
903 | if (IS_ERR(resource->hwmon_dev)) { | |
904 | res = PTR_ERR(resource->hwmon_dev); | |
905 | goto exit_remove; | |
906 | } | |
907 | ||
908 | res = 0; | |
909 | goto exit; | |
910 | ||
911 | exit_remove: | |
912 | remove_attrs(resource); | |
913 | exit_free: | |
914 | kfree(resource); | |
915 | exit: | |
916 | return res; | |
917 | } | |
918 | ||
51fac838 | 919 | static int acpi_power_meter_remove(struct acpi_device *device) |
de584afa DW |
920 | { |
921 | struct acpi_power_meter_resource *resource; | |
922 | ||
923 | if (!device || !acpi_driver_data(device)) | |
924 | return -EINVAL; | |
925 | ||
926 | resource = acpi_driver_data(device); | |
927 | hwmon_device_unregister(resource->hwmon_dev); | |
928 | ||
929 | free_capabilities(resource); | |
930 | remove_attrs(resource); | |
931 | ||
932 | kfree(resource); | |
933 | return 0; | |
934 | } | |
935 | ||
9baeb8fd GR |
936 | #ifdef CONFIG_PM_SLEEP |
937 | ||
c5dec018 | 938 | static int acpi_power_meter_resume(struct device *dev) |
de584afa DW |
939 | { |
940 | struct acpi_power_meter_resource *resource; | |
941 | ||
c5dec018 RW |
942 | if (!dev) |
943 | return -EINVAL; | |
944 | ||
945 | resource = acpi_driver_data(to_acpi_device(dev)); | |
946 | if (!resource) | |
de584afa DW |
947 | return -EINVAL; |
948 | ||
de584afa DW |
949 | free_capabilities(resource); |
950 | read_capabilities(resource); | |
951 | ||
952 | return 0; | |
953 | } | |
954 | ||
9baeb8fd GR |
955 | #endif /* CONFIG_PM_SLEEP */ |
956 | ||
c5dec018 RW |
957 | static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); |
958 | ||
de584afa DW |
959 | static struct acpi_driver acpi_power_meter_driver = { |
960 | .name = "power_meter", | |
961 | .class = ACPI_POWER_METER_CLASS, | |
962 | .ids = power_meter_ids, | |
963 | .ops = { | |
964 | .add = acpi_power_meter_add, | |
965 | .remove = acpi_power_meter_remove, | |
de584afa DW |
966 | .notify = acpi_power_meter_notify, |
967 | }, | |
c5dec018 | 968 | .drv.pm = &acpi_power_meter_pm, |
de584afa DW |
969 | }; |
970 | ||
971 | /* Module init/exit routines */ | |
972 | static int __init enable_cap_knobs(const struct dmi_system_id *d) | |
973 | { | |
974 | cap_in_hardware = 1; | |
975 | return 0; | |
976 | } | |
977 | ||
978 | static struct dmi_system_id __initdata pm_dmi_table[] = { | |
979 | { | |
980 | enable_cap_knobs, "IBM Active Energy Manager", | |
981 | { | |
982 | DMI_MATCH(DMI_SYS_VENDOR, "IBM") | |
983 | }, | |
984 | }, | |
985 | {} | |
986 | }; | |
987 | ||
988 | static int __init acpi_power_meter_init(void) | |
989 | { | |
990 | int result; | |
991 | ||
992 | if (acpi_disabled) | |
993 | return -ENODEV; | |
994 | ||
995 | dmi_check_system(pm_dmi_table); | |
996 | ||
997 | result = acpi_bus_register_driver(&acpi_power_meter_driver); | |
998 | if (result < 0) | |
19f053c8 | 999 | return result; |
de584afa DW |
1000 | |
1001 | return 0; | |
1002 | } | |
1003 | ||
1004 | static void __exit acpi_power_meter_exit(void) | |
1005 | { | |
1006 | acpi_bus_unregister_driver(&acpi_power_meter_driver); | |
1007 | } | |
1008 | ||
5407e051 | 1009 | MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); |
de584afa DW |
1010 | MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); |
1011 | MODULE_LICENSE("GPL"); | |
1012 | ||
1013 | module_param(force_cap_on, bool, 0644); | |
1014 | MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); | |
1015 | ||
1016 | module_init(acpi_power_meter_init); | |
1017 | module_exit(acpi_power_meter_exit); |