1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * hwmon driver for HP (and some HP Compaq) business-class computers that |
4 | * report numeric sensor data via Windows Management Instrumentation (WMI). |
5 | * |
6 | * Copyright (C) 2023 James Seo <james@equiv.tech> |
7 | * |
8 | * References: |
9 | * [1] Hewlett-Packard Development Company, L.P., |
10 | * "HP Client Management Interface Technical White Paper", 2005. [Online]. |
11 | * Available: https://h20331.www2.hp.com/hpsub/downloads/cmi_whitepaper.pdf |
12 | * [2] Hewlett-Packard Development Company, L.P., |
13 | * "HP Retail Manageability", 2012. [Online]. |
14 | * Available: http://h10032.www1.hp.com/ctg/Manual/c03291135.pdf |
15 | * [3] Linux Hardware Project, A. Ponomarenko et al., |
16 | * "linuxhw/ACPI - Collect ACPI table dumps", 2018. [Online]. |
17 | * Available: https://github.com/linuxhw/ACPI |
18 | * [4] P. Rohár, "bmfdec - Decompile binary MOF file (BMF) from WMI buffer", |
19 | * 2017. [Online]. Available: https://github.com/pali/bmfdec |
20 | * [5] Microsoft Corporation, "Driver-Defined WMI Data Items", 2017. [Online]. |
21 | * Available: https://learn.microsoft.com/en-us/windows-hardware/drivers/kernel/driver-defined-wmi-data-items |
22 | */ |
23 | |
24 | #include <linux/acpi.h> |
25 | #include <linux/debugfs.h> |
26 | #include <linux/hwmon.h> |
27 | #include <linux/jiffies.h> |
28 | #include <linux/mutex.h> |
29 | #include <linux/nls.h> |
30 | #include <linux/units.h> |
31 | #include <linux/wmi.h> |
32 | |
33 | #define HP_WMI_EVENT_NAMESPACE "root\\WMI" |
34 | #define HP_WMI_EVENT_CLASS "HPBIOS_BIOSEvent" |
35 | #define HP_WMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C" |
36 | #define HP_WMI_NUMERIC_SENSOR_GUID "8F1F6435-9F42-42C8-BADC-0E9424F20C9A" |
37 | #define HP_WMI_PLATFORM_EVENTS_GUID "41227C2D-80E1-423F-8B8E-87E32755A0EB" |
38 | |
39 | /* Patterns for recognizing sensors and matching events to channels. */ |
40 | |
41 | #define HP_WMI_PATTERN_SYS_TEMP "Chassis Thermal Index" |
42 | #define HP_WMI_PATTERN_SYS_TEMP2 "System Ambient Temperature" |
43 | #define HP_WMI_PATTERN_CPU_TEMP "CPU Thermal Index" |
44 | #define HP_WMI_PATTERN_CPU_TEMP2 "CPU Temperature" |
45 | #define HP_WMI_PATTERN_TEMP_SENSOR "Thermal Index" |
46 | #define HP_WMI_PATTERN_TEMP_ALARM "Thermal Critical" |
47 | #define HP_WMI_PATTERN_INTRUSION_ALARM "Hood Intrusion" |
48 | #define HP_WMI_PATTERN_FAN_ALARM "Stall" |
49 | #define HP_WMI_PATTERN_TEMP "Temperature" |
50 | #define HP_WMI_PATTERN_CPU "CPU" |
51 | |
52 | /* These limits are arbitrary. The WMI implementation may vary by system. */ |
53 | |
54 | #define HP_WMI_MAX_STR_SIZE 128U |
55 | #define HP_WMI_MAX_PROPERTIES 32U |
56 | #define HP_WMI_MAX_INSTANCES 32U |
57 | |
58 | enum hp_wmi_type { |
59 | HP_WMI_TYPE_OTHER = 1, |
60 | HP_WMI_TYPE_TEMPERATURE = 2, |
61 | HP_WMI_TYPE_VOLTAGE = 3, |
62 | HP_WMI_TYPE_CURRENT = 4, |
63 | HP_WMI_TYPE_AIR_FLOW = 12, |
64 | HP_WMI_TYPE_INTRUSION = 0xabadb01, /* Custom. */ |
65 | }; |
66 | |
67 | enum hp_wmi_category { |
68 | HP_WMI_CATEGORY_SENSOR = 3, |
69 | }; |
70 | |
71 | enum hp_wmi_severity { |
72 | HP_WMI_SEVERITY_UNKNOWN = 0, |
73 | HP_WMI_SEVERITY_OK = 5, |
74 | HP_WMI_SEVERITY_DEGRADED_WARNING = 10, |
75 | HP_WMI_SEVERITY_MINOR_FAILURE = 15, |
76 | HP_WMI_SEVERITY_MAJOR_FAILURE = 20, |
77 | HP_WMI_SEVERITY_CRITICAL_FAILURE = 25, |
78 | HP_WMI_SEVERITY_NON_RECOVERABLE_ERROR = 30, |
79 | }; |
80 | |
81 | enum hp_wmi_status { |
82 | HP_WMI_STATUS_OK = 2, |
83 | HP_WMI_STATUS_DEGRADED = 3, |
84 | HP_WMI_STATUS_STRESSED = 4, |
85 | HP_WMI_STATUS_PREDICTIVE_FAILURE = 5, |
86 | HP_WMI_STATUS_ERROR = 6, |
87 | HP_WMI_STATUS_NON_RECOVERABLE_ERROR = 7, |
88 | HP_WMI_STATUS_NO_CONTACT = 12, |
89 | HP_WMI_STATUS_LOST_COMMUNICATION = 13, |
90 | HP_WMI_STATUS_ABORTED = 14, |
91 | HP_WMI_STATUS_SUPPORTING_ENTITY_IN_ERROR = 16, |
92 | |
93 | /* Occurs combined with one of "OK", "Degraded", and "Error" [1]. */ |
94 | HP_WMI_STATUS_COMPLETED = 17, |
95 | }; |
96 | |
97 | enum hp_wmi_units { |
98 | HP_WMI_UNITS_OTHER = 1, |
99 | HP_WMI_UNITS_DEGREES_C = 2, |
100 | HP_WMI_UNITS_DEGREES_F = 3, |
101 | HP_WMI_UNITS_DEGREES_K = 4, |
102 | HP_WMI_UNITS_VOLTS = 5, |
103 | HP_WMI_UNITS_AMPS = 6, |
104 | HP_WMI_UNITS_RPM = 19, |
105 | }; |
106 | |
107 | enum hp_wmi_property { |
108 | HP_WMI_PROPERTY_NAME = 0, |
109 | HP_WMI_PROPERTY_DESCRIPTION = 1, |
110 | HP_WMI_PROPERTY_SENSOR_TYPE = 2, |
111 | HP_WMI_PROPERTY_OTHER_SENSOR_TYPE = 3, |
112 | HP_WMI_PROPERTY_OPERATIONAL_STATUS = 4, |
113 | HP_WMI_PROPERTY_SIZE = 5, |
114 | HP_WMI_PROPERTY_POSSIBLE_STATES = 6, |
115 | HP_WMI_PROPERTY_CURRENT_STATE = 7, |
116 | HP_WMI_PROPERTY_BASE_UNITS = 8, |
117 | HP_WMI_PROPERTY_UNIT_MODIFIER = 9, |
118 | HP_WMI_PROPERTY_CURRENT_READING = 10, |
119 | HP_WMI_PROPERTY_RATE_UNITS = 11, |
120 | }; |
121 | |
122 | static const acpi_object_type hp_wmi_property_map[] = { |
123 | [HP_WMI_PROPERTY_NAME] = ACPI_TYPE_STRING, |
124 | [HP_WMI_PROPERTY_DESCRIPTION] = ACPI_TYPE_STRING, |
125 | [HP_WMI_PROPERTY_SENSOR_TYPE] = ACPI_TYPE_INTEGER, |
126 | [HP_WMI_PROPERTY_OTHER_SENSOR_TYPE] = ACPI_TYPE_STRING, |
127 | [HP_WMI_PROPERTY_OPERATIONAL_STATUS] = ACPI_TYPE_INTEGER, |
128 | [HP_WMI_PROPERTY_SIZE] = ACPI_TYPE_INTEGER, |
129 | [HP_WMI_PROPERTY_POSSIBLE_STATES] = ACPI_TYPE_STRING, |
130 | [HP_WMI_PROPERTY_CURRENT_STATE] = ACPI_TYPE_STRING, |
131 | [HP_WMI_PROPERTY_BASE_UNITS] = ACPI_TYPE_INTEGER, |
132 | [HP_WMI_PROPERTY_UNIT_MODIFIER] = ACPI_TYPE_INTEGER, |
133 | [HP_WMI_PROPERTY_CURRENT_READING] = ACPI_TYPE_INTEGER, |
134 | [HP_WMI_PROPERTY_RATE_UNITS] = ACPI_TYPE_INTEGER, |
135 | }; |
136 | |
137 | enum hp_wmi_platform_events_property { |
138 | HP_WMI_PLATFORM_EVENTS_PROPERTY_NAME = 0, |
139 | HP_WMI_PLATFORM_EVENTS_PROPERTY_DESCRIPTION = 1, |
140 | HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_NAMESPACE = 2, |
141 | HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_CLASS = 3, |
142 | HP_WMI_PLATFORM_EVENTS_PROPERTY_CATEGORY = 4, |
143 | HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_SEVERITY = 5, |
144 | HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_STATUS = 6, |
145 | }; |
146 | |
147 | static const acpi_object_type hp_wmi_platform_events_property_map[] = { |
148 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_NAME] = ACPI_TYPE_STRING, |
149 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_DESCRIPTION] = ACPI_TYPE_STRING, |
150 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_NAMESPACE] = ACPI_TYPE_STRING, |
151 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_CLASS] = ACPI_TYPE_STRING, |
152 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_CATEGORY] = ACPI_TYPE_INTEGER, |
153 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_SEVERITY] = ACPI_TYPE_INTEGER, |
154 | [HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_STATUS] = ACPI_TYPE_INTEGER, |
155 | }; |
156 | |
157 | enum hp_wmi_event_property { |
158 | HP_WMI_EVENT_PROPERTY_NAME = 0, |
159 | HP_WMI_EVENT_PROPERTY_DESCRIPTION = 1, |
160 | HP_WMI_EVENT_PROPERTY_CATEGORY = 2, |
161 | HP_WMI_EVENT_PROPERTY_SEVERITY = 3, |
162 | HP_WMI_EVENT_PROPERTY_STATUS = 4, |
163 | }; |
164 | |
165 | static const acpi_object_type hp_wmi_event_property_map[] = { |
166 | [HP_WMI_EVENT_PROPERTY_NAME] = ACPI_TYPE_STRING, |
167 | [HP_WMI_EVENT_PROPERTY_DESCRIPTION] = ACPI_TYPE_STRING, |
168 | [HP_WMI_EVENT_PROPERTY_CATEGORY] = ACPI_TYPE_INTEGER, |
169 | [HP_WMI_EVENT_PROPERTY_SEVERITY] = ACPI_TYPE_INTEGER, |
170 | [HP_WMI_EVENT_PROPERTY_STATUS] = ACPI_TYPE_INTEGER, |
171 | }; |
172 | |
173 | static const enum hwmon_sensor_types hp_wmi_hwmon_type_map[] = { |
174 | [HP_WMI_TYPE_TEMPERATURE] = hwmon_temp, |
175 | [HP_WMI_TYPE_VOLTAGE] = hwmon_in, |
176 | [HP_WMI_TYPE_CURRENT] = hwmon_curr, |
177 | [HP_WMI_TYPE_AIR_FLOW] = hwmon_fan, |
178 | }; |
179 | |
180 | static const u32 hp_wmi_hwmon_attributes[hwmon_max] = { |
181 | [hwmon_chip] = HWMON_C_REGISTER_TZ, |
182 | [hwmon_temp] = HWMON_T_INPUT | HWMON_T_LABEL | HWMON_T_FAULT, |
183 | [hwmon_in] = HWMON_I_INPUT | HWMON_I_LABEL, |
184 | [hwmon_curr] = HWMON_C_INPUT | HWMON_C_LABEL, |
185 | [hwmon_fan] = HWMON_F_INPUT | HWMON_F_LABEL | HWMON_F_FAULT, |
186 | [hwmon_intrusion] = HWMON_INTRUSION_ALARM, |
187 | }; |
188 | |
189 | /* |
190 | * struct hp_wmi_numeric_sensor - a HPBIOS_BIOSNumericSensor instance |
191 | * |
192 | * Two variants of HPBIOS_BIOSNumericSensor are known. The first is specified |
193 | * in [1] and appears to be much more widespread. The second was discovered by |
194 | * decoding BMOF blobs [4], seems to be found only in some newer ZBook systems |
195 | * [3], and has two new properties and a slightly different property order. |
196 | * |
197 | * These differences don't matter on Windows, where WMI object properties are |
198 | * accessed by name. For us, supporting both variants gets ugly and hacky at |
199 | * times. The fun begins now; this struct is defined as per the new variant. |
200 | * |
201 | * Effective MOF definition: |
202 | * |
203 | * #pragma namespace("\\\\.\\root\\HP\\InstrumentedBIOS"); |
204 | * class HPBIOS_BIOSNumericSensor { |
205 | * [read] string Name; |
206 | * [read] string Description; |
207 | * [read, ValueMap {"0","1","2","3","4","5","6","7","8","9", |
208 | * "10","11","12"}, Values {"Unknown","Other","Temperature", |
209 | * "Voltage","Current","Tachometer","Counter","Switch","Lock", |
210 | * "Humidity","Smoke Detection","Presence","Air Flow"}] |
211 | * uint32 SensorType; |
212 | * [read] string OtherSensorType; |
213 | * [read, ValueMap {"0","1","2","3","4","5","6","7","8","9", |
214 | * "10","11","12","13","14","15","16","17","18","..", |
215 | * "0x8000.."}, Values {"Unknown","Other","OK","Degraded", |
216 | * "Stressed","Predictive Failure","Error", |
217 | * "Non-Recoverable Error","Starting","Stopping","Stopped", |
218 | * "In Service","No Contact","Lost Communication","Aborted", |
219 | * "Dormant","Supporting Entity in Error","Completed", |
220 | * "Power Mode","DMTF Reserved","Vendor Reserved"}] |
221 | * uint32 OperationalStatus; |
222 | * [read] uint32 Size; |
223 | * [read] string PossibleStates[]; |
224 | * [read] string CurrentState; |
225 | * [read, ValueMap {"0","1","2","3","4","5","6","7","8","9", |
226 | * "10","11","12","13","14","15","16","17","18","19","20", |
227 | * "21","22","23","24","25","26","27","28","29","30","31", |
228 | * "32","33","34","35","36","37","38","39","40","41","42", |
229 | * "43","44","45","46","47","48","49","50","51","52","53", |
230 | * "54","55","56","57","58","59","60","61","62","63","64", |
231 | * "65"}, Values {"Unknown","Other","Degrees C","Degrees F", |
232 | * "Degrees K","Volts","Amps","Watts","Joules","Coulombs", |
233 | * "VA","Nits","Lumens","Lux","Candelas","kPa","PSI", |
234 | * "Newtons","CFM","RPM","Hertz","Seconds","Minutes", |
235 | * "Hours","Days","Weeks","Mils","Inches","Feet", |
236 | * "Cubic Inches","Cubic Feet","Meters","Cubic Centimeters", |
237 | * "Cubic Meters","Liters","Fluid Ounces","Radians", |
238 | * "Steradians","Revolutions","Cycles","Gravities","Ounces", |
239 | * "Pounds","Foot-Pounds","Ounce-Inches","Gauss","Gilberts", |
240 | * "Henries","Farads","Ohms","Siemens","Moles","Becquerels", |
241 | * "PPM (parts/million)","Decibels","DbA","DbC","Grays", |
242 | * "Sieverts","Color Temperature Degrees K","Bits","Bytes", |
243 | * "Words (data)","DoubleWords","QuadWords","Percentage"}] |
244 | * uint32 BaseUnits; |
245 | * [read] sint32 UnitModifier; |
246 | * [read] uint32 CurrentReading; |
247 | * [read] uint32 RateUnits; |
248 | * }; |
249 | * |
250 | * Effective MOF definition of old variant [1] (sans redundant info): |
251 | * |
252 | * class HPBIOS_BIOSNumericSensor { |
253 | * [read] string Name; |
254 | * [read] string Description; |
255 | * [read] uint32 SensorType; |
256 | * [read] string OtherSensorType; |
257 | * [read] uint32 OperationalStatus; |
258 | * [read] string CurrentState; |
259 | * [read] string PossibleStates[]; |
260 | * [read] uint32 BaseUnits; |
261 | * [read] sint32 UnitModifier; |
262 | * [read] uint32 CurrentReading; |
263 | * }; |
264 | */ |
265 | struct hp_wmi_numeric_sensor { |
266 | const char *name; |
267 | const char *description; |
268 | u32 sensor_type; |
269 | const char *other_sensor_type; /* Explains "Other" SensorType. */ |
270 | u32 operational_status; |
271 | u8 size; /* Count of PossibleStates[]. */ |
272 | const char **possible_states; |
273 | const char *current_state; |
274 | u32 base_units; |
275 | s32 unit_modifier; |
276 | u32 current_reading; |
277 | u32 rate_units; |
278 | }; |
279 | |
280 | /* |
281 | * struct hp_wmi_platform_events - a HPBIOS_PlatformEvents instance |
282 | * |
283 | * Instances of this object reveal the set of possible HPBIOS_BIOSEvent |
284 | * instances for the current system, but it may not always be present. |
285 | * |
286 | * Effective MOF definition: |
287 | * |
288 | * #pragma namespace("\\\\.\\root\\HP\\InstrumentedBIOS"); |
289 | * class HPBIOS_PlatformEvents { |
290 | * [read] string Name; |
291 | * [read] string Description; |
292 | * [read] string SourceNamespace; |
293 | * [read] string SourceClass; |
294 | * [read, ValueMap {"0","1","2","3","4",".."}, Values { |
295 | * "Unknown","Configuration Change","Button Pressed", |
296 | * "Sensor","BIOS Settings","Reserved"}] |
297 | * uint32 Category; |
298 | * [read, ValueMap{"0","5","10","15","20","25","30",".."}, |
299 | * Values{"Unknown","OK","Degraded/Warning","Minor Failure", |
300 | * "Major Failure","Critical Failure","Non-recoverable Error", |
301 | * "DMTF Reserved"}] |
302 | * uint32 PossibleSeverity; |
303 | * [read, ValueMap {"0","1","2","3","4","5","6","7","8","9", |
304 | * "10","11","12","13","14","15","16","17","18","..", |
305 | * "0x8000.."}, Values {"Unknown","Other","OK","Degraded", |
306 | * "Stressed","Predictive Failure","Error", |
307 | * "Non-Recoverable Error","Starting","Stopping","Stopped", |
308 | * "In Service","No Contact","Lost Communication","Aborted", |
309 | * "Dormant","Supporting Entity in Error","Completed", |
310 | * "Power Mode","DMTF Reserved","Vendor Reserved"}] |
311 | * uint32 PossibleStatus; |
312 | * }; |
313 | */ |
314 | struct hp_wmi_platform_events { |
315 | const char *name; |
316 | const char *description; |
317 | const char *source_namespace; |
318 | const char *source_class; |
319 | u32 category; |
320 | u32 possible_severity; |
321 | u32 possible_status; |
322 | }; |
323 | |
324 | /* |
325 | * struct hp_wmi_event - a HPBIOS_BIOSEvent instance |
326 | * |
327 | * Effective MOF definition [1] (corrected below from original): |
328 | * |
329 | * #pragma namespace("\\\\.\\root\\WMI"); |
330 | * class HPBIOS_BIOSEvent : WMIEvent { |
331 | * [read] string Name; |
332 | * [read] string Description; |
333 | * [read ValueMap {"0","1","2","3","4"}, Values {"Unknown", |
334 | * "Configuration Change","Button Pressed","Sensor", |
335 | * "BIOS Settings"}] |
336 | * uint32 Category; |
337 | * [read, ValueMap {"0","5","10","15","20","25","30"}, |
338 | * Values {"Unknown","OK","Degraded/Warning", |
339 | * "Minor Failure","Major Failure","Critical Failure", |
340 | * "Non-recoverable Error"}] |
341 | * uint32 Severity; |
342 | * [read, ValueMap {"0","1","2","3","4","5","6","7","8", |
343 | * "9","10","11","12","13","14","15","16","17","18","..", |
344 | * "0x8000.."}, Values {"Unknown","Other","OK","Degraded", |
345 | * "Stressed","Predictive Failure","Error", |
346 | * "Non-Recoverable Error","Starting","Stopping","Stopped", |
347 | * "In Service","No Contact","Lost Communication","Aborted", |
348 | * "Dormant","Supporting Entity in Error","Completed", |
349 | * "Power Mode","DMTF Reserved","Vendor Reserved"}] |
350 | * uint32 Status; |
351 | * }; |
352 | */ |
353 | struct hp_wmi_event { |
354 | const char *name; |
355 | const char *description; |
356 | u32 category; |
357 | }; |
358 | |
359 | /* |
360 | * struct hp_wmi_info - sensor info |
361 | * @nsensor: numeric sensor properties |
362 | * @instance: its WMI instance number |
363 | * @state: pointer to driver state |
364 | * @has_alarm: whether sensor has an alarm flag |
365 | * @alarm: alarm flag |
366 | * @type: its hwmon sensor type |
367 | * @cached_val: current sensor reading value, scaled for hwmon |
368 | * @last_updated: when these readings were last updated |
369 | */ |
370 | struct hp_wmi_info { |
371 | struct hp_wmi_numeric_sensor nsensor; |
372 | u8 instance; |
373 | void *state; /* void *: Avoid forward declaration. */ |
374 | bool has_alarm; |
375 | bool alarm; |
376 | enum hwmon_sensor_types type; |
377 | long cached_val; |
378 | unsigned long last_updated; /* In jiffies. */ |
379 | |
380 | }; |
381 | |
382 | /* |
383 | * struct hp_wmi_sensors - driver state |
384 | * @wdev: pointer to the parent WMI device |
385 | * @info_map: sensor info structs by hwmon type and channel number |
386 | * @channel_count: count of hwmon channels by hwmon type |
387 | * @has_intrusion: whether an intrusion sensor is present |
388 | * @intrusion: intrusion flag |
389 | * @lock: mutex to lock polling WMI and changes to driver state |
390 | */ |
391 | struct hp_wmi_sensors { |
392 | struct wmi_device *wdev; |
393 | struct hp_wmi_info **info_map[hwmon_max]; |
394 | u8 channel_count[hwmon_max]; |
395 | bool has_intrusion; |
396 | bool intrusion; |
397 | |
398 | struct mutex lock; /* Lock polling WMI and driver state changes. */ |
399 | }; |
400 | |
401 | static bool is_raw_wmi_string(const u8 *pointer, u32 length) |
402 | { |
403 | const u16 *ptr; |
404 | u16 len; |
405 | |
406 | /* WMI strings are length-prefixed UTF-16 [5]. */ |
407 | if (length <= sizeof(*ptr)) |
408 | return false; |
409 | |
410 | length -= sizeof(*ptr); |
411 | ptr = (const u16 *)pointer; |
412 | len = *ptr; |
413 | |
414 | return len <= length && !(len & 1); |
415 | } |
416 | |
417 | static char *convert_raw_wmi_string(const u8 *buf) |
418 | { |
419 | const wchar_t *src; |
420 | unsigned int cps; |
421 | unsigned int len; |
422 | char *dst; |
423 | int i; |
424 | |
425 | src = (const wchar_t *)buf; |
426 | |
427 | /* Count UTF-16 code points. Exclude trailing null padding. */ |
428 | cps = *src / sizeof(*src); |
429 | while (cps && !src[cps]) |
430 | cps--; |
431 | |
432 | /* Each code point becomes up to 3 UTF-8 characters. */ |
433 | len = min(cps * 3, HP_WMI_MAX_STR_SIZE - 1); |
434 | |
435 | dst = kmalloc(size: (len + 1) * sizeof(*dst), GFP_KERNEL); |
436 | if (!dst) |
437 | return NULL; |
438 | |
439 | i = utf16s_to_utf8s(pwcs: ++src, len: cps, endian: UTF16_LITTLE_ENDIAN, s: dst, maxlen: len); |
440 | dst[i] = '\0'; |
441 | |
442 | return dst; |
443 | } |
444 | |
445 | /* hp_wmi_strdup - devm_kstrdup, but length-limited */ |
446 | static char *hp_wmi_strdup(struct device *dev, const char *src) |
447 | { |
448 | char *dst; |
449 | size_t len; |
450 | |
451 | len = strnlen(p: src, HP_WMI_MAX_STR_SIZE - 1); |
452 | |
453 | dst = devm_kmalloc(dev, size: (len + 1) * sizeof(*dst), GFP_KERNEL); |
454 | if (!dst) |
455 | return NULL; |
456 | |
457 | strscpy(dst, src, len + 1); |
458 | |
459 | return dst; |
460 | } |
461 | |
462 | /* hp_wmi_wstrdup - hp_wmi_strdup, but for a raw WMI string */ |
463 | static char *hp_wmi_wstrdup(struct device *dev, const u8 *buf) |
464 | { |
465 | char *src; |
466 | char *dst; |
467 | |
468 | src = convert_raw_wmi_string(buf); |
469 | if (!src) |
470 | return NULL; |
471 | |
472 | dst = hp_wmi_strdup(dev, src: strim(src)); /* Note: Copy is trimmed. */ |
473 | |
474 | kfree(objp: src); |
475 | |
476 | return dst; |
477 | } |
478 | |
479 | /* |
480 | * hp_wmi_get_wobj - poll WMI for a WMI object instance |
481 | * @guid: WMI object GUID |
482 | * @instance: WMI object instance number |
483 | * |
484 | * Returns a new WMI object instance on success, or NULL on error. |
485 | * Caller must kfree() the result. |
486 | */ |
487 | static union acpi_object *hp_wmi_get_wobj(const char *guid, u8 instance) |
488 | { |
489 | struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; |
490 | acpi_status err; |
491 | |
492 | err = wmi_query_block(guid, instance, out: &out); |
493 | if (ACPI_FAILURE(err)) |
494 | return NULL; |
495 | |
496 | return out.pointer; |
497 | } |
498 | |
499 | /* hp_wmi_wobj_instance_count - find count of WMI object instances */ |
500 | static u8 hp_wmi_wobj_instance_count(const char *guid) |
501 | { |
502 | int count; |
503 | |
504 | count = wmi_instance_count(guid); |
505 | |
506 | return clamp(count, 0, (int)HP_WMI_MAX_INSTANCES); |
507 | } |
508 | |
509 | static int check_wobj(const union acpi_object *wobj, |
510 | const acpi_object_type property_map[], int last_prop) |
511 | { |
512 | acpi_object_type type = wobj->type; |
513 | acpi_object_type valid_type; |
514 | union acpi_object *elements; |
515 | u32 elem_count; |
516 | int prop; |
517 | |
518 | if (type != ACPI_TYPE_PACKAGE) |
519 | return -EINVAL; |
520 | |
521 | elem_count = wobj->package.count; |
522 | if (elem_count != last_prop + 1) |
523 | return -EINVAL; |
524 | |
525 | elements = wobj->package.elements; |
526 | for (prop = 0; prop <= last_prop; prop++) { |
527 | type = elements[prop].type; |
528 | valid_type = property_map[prop]; |
529 | if (type != valid_type) { |
530 | if (type == ACPI_TYPE_BUFFER && |
531 | valid_type == ACPI_TYPE_STRING && |
532 | is_raw_wmi_string(pointer: elements[prop].buffer.pointer, |
533 | length: elements[prop].buffer.length)) |
534 | continue; |
535 | return -EINVAL; |
536 | } |
537 | } |
538 | |
539 | return 0; |
540 | } |
541 | |
542 | static int (struct device *dev, |
543 | union acpi_object *element, |
544 | acpi_object_type type, |
545 | u32 *out_value, char **out_string) |
546 | { |
547 | switch (type) { |
548 | case ACPI_TYPE_INTEGER: |
549 | *out_value = element->integer.value; |
550 | break; |
551 | |
552 | case ACPI_TYPE_STRING: |
553 | *out_string = element->type == ACPI_TYPE_BUFFER ? |
554 | hp_wmi_wstrdup(dev, buf: element->buffer.pointer) : |
555 | hp_wmi_strdup(dev, src: strim(element->string.pointer)); |
556 | if (!*out_string) |
557 | return -ENOMEM; |
558 | break; |
559 | |
560 | default: |
561 | return -EINVAL; |
562 | } |
563 | |
564 | return 0; |
565 | } |
566 | |
567 | /* |
568 | * check_numeric_sensor_wobj - validate a HPBIOS_BIOSNumericSensor instance |
569 | * @wobj: pointer to WMI object instance to check |
570 | * @out_size: out pointer to count of possible states |
571 | * @out_is_new: out pointer to whether this is a "new" variant object |
572 | * |
573 | * Returns 0 on success, or a negative error code on error. |
574 | */ |
575 | static int check_numeric_sensor_wobj(const union acpi_object *wobj, |
576 | u8 *out_size, bool *out_is_new) |
577 | { |
578 | acpi_object_type type = wobj->type; |
579 | int prop = HP_WMI_PROPERTY_NAME; |
580 | acpi_object_type valid_type; |
581 | union acpi_object *elements; |
582 | u32 elem_count; |
583 | int last_prop; |
584 | bool is_new; |
585 | u8 count; |
586 | u32 j; |
587 | u32 i; |
588 | |
589 | if (type != ACPI_TYPE_PACKAGE) |
590 | return -EINVAL; |
591 | |
592 | /* |
593 | * elements is a variable-length array of ACPI objects, one for |
594 | * each property of the WMI object instance, except that the |
595 | * strings in PossibleStates[] are flattened into this array |
596 | * as if each individual string were a property by itself. |
597 | */ |
598 | elements = wobj->package.elements; |
599 | |
600 | elem_count = wobj->package.count; |
601 | if (elem_count <= HP_WMI_PROPERTY_SIZE || |
602 | elem_count > HP_WMI_MAX_PROPERTIES) |
603 | return -EINVAL; |
604 | |
605 | type = elements[HP_WMI_PROPERTY_SIZE].type; |
606 | switch (type) { |
607 | case ACPI_TYPE_INTEGER: |
608 | is_new = true; |
609 | last_prop = HP_WMI_PROPERTY_RATE_UNITS; |
610 | break; |
611 | |
612 | case ACPI_TYPE_STRING: |
613 | is_new = false; |
614 | last_prop = HP_WMI_PROPERTY_CURRENT_READING; |
615 | break; |
616 | |
617 | default: |
618 | return -EINVAL; |
619 | } |
620 | |
621 | /* |
622 | * In general, the count of PossibleStates[] must be > 0. |
623 | * Also, the old variant lacks the Size property, so we may need to |
624 | * reduce the value of last_prop by 1 when doing arithmetic with it. |
625 | */ |
626 | if (elem_count < last_prop - !is_new + 1) |
627 | return -EINVAL; |
628 | |
629 | count = elem_count - (last_prop - !is_new); |
630 | |
631 | for (i = 0; i < elem_count && prop <= last_prop; i++, prop++) { |
632 | type = elements[i].type; |
633 | valid_type = hp_wmi_property_map[prop]; |
634 | if (type != valid_type) |
635 | return -EINVAL; |
636 | |
637 | switch (prop) { |
638 | case HP_WMI_PROPERTY_OPERATIONAL_STATUS: |
639 | /* Old variant: CurrentState follows OperationalStatus. */ |
640 | if (!is_new) |
641 | prop = HP_WMI_PROPERTY_CURRENT_STATE - 1; |
642 | break; |
643 | |
644 | case HP_WMI_PROPERTY_SIZE: |
645 | /* New variant: Size == count of PossibleStates[]. */ |
646 | if (count != elements[i].integer.value) |
647 | return -EINVAL; |
648 | break; |
649 | |
650 | case HP_WMI_PROPERTY_POSSIBLE_STATES: |
651 | /* PossibleStates[0] has already been type-checked. */ |
652 | for (j = 0; i + 1 < elem_count && j + 1 < count; j++) { |
653 | type = elements[++i].type; |
654 | if (type != valid_type) |
655 | return -EINVAL; |
656 | } |
657 | |
658 | /* Old variant: BaseUnits follows PossibleStates[]. */ |
659 | if (!is_new) |
660 | prop = HP_WMI_PROPERTY_BASE_UNITS - 1; |
661 | break; |
662 | |
663 | case HP_WMI_PROPERTY_CURRENT_STATE: |
664 | /* Old variant: PossibleStates[] follows CurrentState. */ |
665 | if (!is_new) |
666 | prop = HP_WMI_PROPERTY_POSSIBLE_STATES - 1; |
667 | break; |
668 | } |
669 | } |
670 | |
671 | if (prop != last_prop + 1) |
672 | return -EINVAL; |
673 | |
674 | *out_size = count; |
675 | *out_is_new = is_new; |
676 | |
677 | return 0; |
678 | } |
679 | |
680 | static int |
681 | numeric_sensor_is_connected(const struct hp_wmi_numeric_sensor *nsensor) |
682 | { |
683 | u32 operational_status = nsensor->operational_status; |
684 | |
685 | return operational_status != HP_WMI_STATUS_NO_CONTACT; |
686 | } |
687 | |
688 | static int numeric_sensor_has_fault(const struct hp_wmi_numeric_sensor *nsensor) |
689 | { |
690 | u32 operational_status = nsensor->operational_status; |
691 | |
692 | switch (operational_status) { |
693 | case HP_WMI_STATUS_DEGRADED: |
694 | case HP_WMI_STATUS_STRESSED: /* e.g. Overload, overtemp. */ |
695 | case HP_WMI_STATUS_PREDICTIVE_FAILURE: /* e.g. Fan removed. */ |
696 | case HP_WMI_STATUS_ERROR: |
697 | case HP_WMI_STATUS_NON_RECOVERABLE_ERROR: |
698 | case HP_WMI_STATUS_NO_CONTACT: |
699 | case HP_WMI_STATUS_LOST_COMMUNICATION: |
700 | case HP_WMI_STATUS_ABORTED: |
701 | case HP_WMI_STATUS_SUPPORTING_ENTITY_IN_ERROR: |
702 | |
703 | /* Assume combination by addition; bitwise OR doesn't make sense. */ |
704 | case HP_WMI_STATUS_COMPLETED + HP_WMI_STATUS_DEGRADED: |
705 | case HP_WMI_STATUS_COMPLETED + HP_WMI_STATUS_ERROR: |
706 | return true; |
707 | } |
708 | |
709 | return false; |
710 | } |
711 | |
712 | /* scale_numeric_sensor - scale sensor reading for hwmon */ |
713 | static long scale_numeric_sensor(const struct hp_wmi_numeric_sensor *nsensor) |
714 | { |
715 | u32 current_reading = nsensor->current_reading; |
716 | s32 unit_modifier = nsensor->unit_modifier; |
717 | u32 sensor_type = nsensor->sensor_type; |
718 | u32 base_units = nsensor->base_units; |
719 | s32 target_modifier; |
720 | long val; |
721 | |
722 | /* Fan readings are in RPM units; others are in milliunits. */ |
723 | target_modifier = sensor_type == HP_WMI_TYPE_AIR_FLOW ? 0 : -3; |
724 | |
725 | val = current_reading; |
726 | |
727 | for (; unit_modifier < target_modifier; unit_modifier++) |
728 | val = DIV_ROUND_CLOSEST(val, 10); |
729 | |
730 | for (; unit_modifier > target_modifier; unit_modifier--) { |
731 | if (val > LONG_MAX / 10) { |
732 | val = LONG_MAX; |
733 | break; |
734 | } |
735 | val *= 10; |
736 | } |
737 | |
738 | if (sensor_type == HP_WMI_TYPE_TEMPERATURE) { |
739 | switch (base_units) { |
740 | case HP_WMI_UNITS_DEGREES_F: |
741 | val -= MILLI * 32; |
742 | val = val <= LONG_MAX / 5 ? |
743 | DIV_ROUND_CLOSEST(val * 5, 9) : |
744 | DIV_ROUND_CLOSEST(val, 9) * 5; |
745 | break; |
746 | |
747 | case HP_WMI_UNITS_DEGREES_K: |
748 | val = milli_kelvin_to_millicelsius(t: val); |
749 | break; |
750 | } |
751 | } |
752 | |
753 | return val; |
754 | } |
755 | |
756 | /* |
757 | * classify_numeric_sensor - classify a numeric sensor |
758 | * @nsensor: pointer to numeric sensor struct |
759 | * |
760 | * Returns an enum hp_wmi_type value on success, |
761 | * or a negative value if the sensor type is unsupported. |
762 | */ |
763 | static int classify_numeric_sensor(const struct hp_wmi_numeric_sensor *nsensor) |
764 | { |
765 | u32 sensor_type = nsensor->sensor_type; |
766 | u32 base_units = nsensor->base_units; |
767 | const char *name = nsensor->name; |
768 | |
769 | switch (sensor_type) { |
770 | case HP_WMI_TYPE_TEMPERATURE: |
771 | /* |
772 | * Some systems have sensors named "X Thermal Index" in "Other" |
773 | * units. Tested CPU sensor examples were found to be in °C, |
774 | * albeit perhaps "differently" accurate; e.g. readings were |
775 | * reliably -6°C vs. coretemp on a HP Compaq Elite 8300, and |
776 | * +8°C on an EliteOne G1 800. But this is still within the |
777 | * realm of plausibility for cheaply implemented motherboard |
778 | * sensors, and chassis readings were about as expected. |
779 | */ |
780 | if ((base_units == HP_WMI_UNITS_OTHER && |
781 | strstr(name, HP_WMI_PATTERN_TEMP_SENSOR)) || |
782 | base_units == HP_WMI_UNITS_DEGREES_C || |
783 | base_units == HP_WMI_UNITS_DEGREES_F || |
784 | base_units == HP_WMI_UNITS_DEGREES_K) |
785 | return HP_WMI_TYPE_TEMPERATURE; |
786 | break; |
787 | |
788 | case HP_WMI_TYPE_VOLTAGE: |
789 | if (base_units == HP_WMI_UNITS_VOLTS) |
790 | return HP_WMI_TYPE_VOLTAGE; |
791 | break; |
792 | |
793 | case HP_WMI_TYPE_CURRENT: |
794 | if (base_units == HP_WMI_UNITS_AMPS) |
795 | return HP_WMI_TYPE_CURRENT; |
796 | break; |
797 | |
798 | case HP_WMI_TYPE_AIR_FLOW: |
799 | /* |
800 | * Strangely, HP considers fan RPM sensor type to be |
801 | * "Air Flow" instead of the more intuitive "Tachometer". |
802 | */ |
803 | if (base_units == HP_WMI_UNITS_RPM) |
804 | return HP_WMI_TYPE_AIR_FLOW; |
805 | break; |
806 | } |
807 | |
808 | return -EINVAL; |
809 | } |
810 | |
811 | static int |
812 | populate_numeric_sensor_from_wobj(struct device *dev, |
813 | struct hp_wmi_numeric_sensor *nsensor, |
814 | union acpi_object *wobj, bool *out_is_new) |
815 | { |
816 | int last_prop = HP_WMI_PROPERTY_RATE_UNITS; |
817 | int prop = HP_WMI_PROPERTY_NAME; |
818 | const char **possible_states; |
819 | union acpi_object *element; |
820 | acpi_object_type type; |
821 | char *string; |
822 | bool is_new; |
823 | u32 value; |
824 | u8 size; |
825 | int err; |
826 | |
827 | err = check_numeric_sensor_wobj(wobj, out_size: &size, out_is_new: &is_new); |
828 | if (err) |
829 | return err; |
830 | |
831 | possible_states = devm_kcalloc(dev, n: size, size: sizeof(*possible_states), |
832 | GFP_KERNEL); |
833 | if (!possible_states) |
834 | return -ENOMEM; |
835 | |
836 | element = wobj->package.elements; |
837 | nsensor->possible_states = possible_states; |
838 | nsensor->size = size; |
839 | |
840 | if (!is_new) |
841 | last_prop = HP_WMI_PROPERTY_CURRENT_READING; |
842 | |
843 | for (; prop <= last_prop; prop++) { |
844 | type = hp_wmi_property_map[prop]; |
845 | |
846 | err = extract_acpi_value(dev, element, type, out_value: &value, out_string: &string); |
847 | if (err) |
848 | return err; |
849 | |
850 | element++; |
851 | |
852 | switch (prop) { |
853 | case HP_WMI_PROPERTY_NAME: |
854 | nsensor->name = string; |
855 | break; |
856 | |
857 | case HP_WMI_PROPERTY_DESCRIPTION: |
858 | nsensor->description = string; |
859 | break; |
860 | |
861 | case HP_WMI_PROPERTY_SENSOR_TYPE: |
862 | if (value > HP_WMI_TYPE_AIR_FLOW) |
863 | return -EINVAL; |
864 | |
865 | nsensor->sensor_type = value; |
866 | break; |
867 | |
868 | case HP_WMI_PROPERTY_OTHER_SENSOR_TYPE: |
869 | nsensor->other_sensor_type = string; |
870 | break; |
871 | |
872 | case HP_WMI_PROPERTY_OPERATIONAL_STATUS: |
873 | nsensor->operational_status = value; |
874 | |
875 | /* Old variant: CurrentState follows OperationalStatus. */ |
876 | if (!is_new) |
877 | prop = HP_WMI_PROPERTY_CURRENT_STATE - 1; |
878 | break; |
879 | |
880 | case HP_WMI_PROPERTY_SIZE: |
881 | break; /* Already set. */ |
882 | |
883 | case HP_WMI_PROPERTY_POSSIBLE_STATES: |
884 | *possible_states++ = string; |
885 | if (--size) |
886 | prop--; |
887 | |
888 | /* Old variant: BaseUnits follows PossibleStates[]. */ |
889 | if (!is_new && !size) |
890 | prop = HP_WMI_PROPERTY_BASE_UNITS - 1; |
891 | break; |
892 | |
893 | case HP_WMI_PROPERTY_CURRENT_STATE: |
894 | nsensor->current_state = string; |
895 | |
896 | /* Old variant: PossibleStates[] follows CurrentState. */ |
897 | if (!is_new) |
898 | prop = HP_WMI_PROPERTY_POSSIBLE_STATES - 1; |
899 | break; |
900 | |
901 | case HP_WMI_PROPERTY_BASE_UNITS: |
902 | nsensor->base_units = value; |
903 | break; |
904 | |
905 | case HP_WMI_PROPERTY_UNIT_MODIFIER: |
906 | /* UnitModifier is signed. */ |
907 | nsensor->unit_modifier = (s32)value; |
908 | break; |
909 | |
910 | case HP_WMI_PROPERTY_CURRENT_READING: |
911 | nsensor->current_reading = value; |
912 | break; |
913 | |
914 | case HP_WMI_PROPERTY_RATE_UNITS: |
915 | nsensor->rate_units = value; |
916 | break; |
917 | |
918 | default: |
919 | return -EINVAL; |
920 | } |
921 | } |
922 | |
923 | *out_is_new = is_new; |
924 | |
925 | return 0; |
926 | } |
927 | |
928 | /* update_numeric_sensor_from_wobj - update fungible sensor properties */ |
929 | static void |
930 | update_numeric_sensor_from_wobj(struct device *dev, |
931 | struct hp_wmi_numeric_sensor *nsensor, |
932 | const union acpi_object *wobj) |
933 | { |
934 | const union acpi_object *elements; |
935 | const union acpi_object *element; |
936 | const char *new_string; |
937 | char *trimmed; |
938 | char *string; |
939 | bool is_new; |
940 | int offset; |
941 | u8 size; |
942 | int err; |
943 | |
944 | err = check_numeric_sensor_wobj(wobj, out_size: &size, out_is_new: &is_new); |
945 | if (err) |
946 | return; |
947 | |
948 | elements = wobj->package.elements; |
949 | |
950 | element = &elements[HP_WMI_PROPERTY_OPERATIONAL_STATUS]; |
951 | nsensor->operational_status = element->integer.value; |
952 | |
953 | /* |
954 | * In general, an index offset is needed after PossibleStates[0]. |
955 | * On a new variant, CurrentState is after PossibleStates[]. This is |
956 | * not the case on an old variant, but we still need to offset the |
957 | * read because CurrentState is where Size would be on a new variant. |
958 | */ |
959 | offset = is_new ? size - 1 : -2; |
960 | |
961 | element = &elements[HP_WMI_PROPERTY_CURRENT_STATE + offset]; |
962 | string = element->type == ACPI_TYPE_BUFFER ? |
963 | convert_raw_wmi_string(buf: element->buffer.pointer) : |
964 | element->string.pointer; |
965 | |
966 | if (string) { |
967 | trimmed = strim(string); |
968 | if (strcmp(trimmed, nsensor->current_state)) { |
969 | new_string = hp_wmi_strdup(dev, src: trimmed); |
970 | if (new_string) { |
971 | devm_kfree(dev, p: nsensor->current_state); |
972 | nsensor->current_state = new_string; |
973 | } |
974 | } |
975 | if (element->type == ACPI_TYPE_BUFFER) |
976 | kfree(objp: string); |
977 | } |
978 | |
979 | /* Old variant: -2 (not -1) because it lacks the Size property. */ |
980 | if (!is_new) |
981 | offset = (int)size - 2; /* size is > 0, i.e. may be 1. */ |
982 | |
983 | element = &elements[HP_WMI_PROPERTY_UNIT_MODIFIER + offset]; |
984 | nsensor->unit_modifier = (s32)element->integer.value; |
985 | |
986 | element = &elements[HP_WMI_PROPERTY_CURRENT_READING + offset]; |
987 | nsensor->current_reading = element->integer.value; |
988 | } |
989 | |
990 | /* |
991 | * check_platform_events_wobj - validate a HPBIOS_PlatformEvents instance |
992 | * @wobj: pointer to WMI object instance to check |
993 | * |
994 | * Returns 0 on success, or a negative error code on error. |
995 | */ |
996 | static int check_platform_events_wobj(const union acpi_object *wobj) |
997 | { |
998 | return check_wobj(wobj, property_map: hp_wmi_platform_events_property_map, |
999 | last_prop: HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_STATUS); |
1000 | } |
1001 | |
1002 | static int |
1003 | populate_platform_events_from_wobj(struct device *dev, |
1004 | struct hp_wmi_platform_events *pevents, |
1005 | union acpi_object *wobj) |
1006 | { |
1007 | int last_prop = HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_STATUS; |
1008 | int prop = HP_WMI_PLATFORM_EVENTS_PROPERTY_NAME; |
1009 | union acpi_object *element; |
1010 | acpi_object_type type; |
1011 | char *string; |
1012 | u32 value; |
1013 | int err; |
1014 | |
1015 | err = check_platform_events_wobj(wobj); |
1016 | if (err) |
1017 | return err; |
1018 | |
1019 | element = wobj->package.elements; |
1020 | |
1021 | for (; prop <= last_prop; prop++, element++) { |
1022 | type = hp_wmi_platform_events_property_map[prop]; |
1023 | |
1024 | err = extract_acpi_value(dev, element, type, out_value: &value, out_string: &string); |
1025 | if (err) |
1026 | return err; |
1027 | |
1028 | switch (prop) { |
1029 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_NAME: |
1030 | pevents->name = string; |
1031 | break; |
1032 | |
1033 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_DESCRIPTION: |
1034 | pevents->description = string; |
1035 | break; |
1036 | |
1037 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_NAMESPACE: |
1038 | if (strcasecmp(HP_WMI_EVENT_NAMESPACE, s2: string)) |
1039 | return -EINVAL; |
1040 | |
1041 | pevents->source_namespace = string; |
1042 | break; |
1043 | |
1044 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_SOURCE_CLASS: |
1045 | if (strcasecmp(HP_WMI_EVENT_CLASS, s2: string)) |
1046 | return -EINVAL; |
1047 | |
1048 | pevents->source_class = string; |
1049 | break; |
1050 | |
1051 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_CATEGORY: |
1052 | pevents->category = value; |
1053 | break; |
1054 | |
1055 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_SEVERITY: |
1056 | pevents->possible_severity = value; |
1057 | break; |
1058 | |
1059 | case HP_WMI_PLATFORM_EVENTS_PROPERTY_POSSIBLE_STATUS: |
1060 | pevents->possible_status = value; |
1061 | break; |
1062 | |
1063 | default: |
1064 | return -EINVAL; |
1065 | } |
1066 | } |
1067 | |
1068 | return 0; |
1069 | } |
1070 | |
1071 | /* |
1072 | * check_event_wobj - validate a HPBIOS_BIOSEvent instance |
1073 | * @wobj: pointer to WMI object instance to check |
1074 | * |
1075 | * Returns 0 on success, or a negative error code on error. |
1076 | */ |
1077 | static int check_event_wobj(const union acpi_object *wobj) |
1078 | { |
1079 | return check_wobj(wobj, property_map: hp_wmi_event_property_map, |
1080 | last_prop: HP_WMI_EVENT_PROPERTY_STATUS); |
1081 | } |
1082 | |
1083 | static int populate_event_from_wobj(struct device *dev, |
1084 | struct hp_wmi_event *event, |
1085 | union acpi_object *wobj) |
1086 | { |
1087 | int prop = HP_WMI_EVENT_PROPERTY_NAME; |
1088 | union acpi_object *element; |
1089 | acpi_object_type type; |
1090 | char *string; |
1091 | u32 value; |
1092 | int err; |
1093 | |
1094 | err = check_event_wobj(wobj); |
1095 | if (err) |
1096 | return err; |
1097 | |
1098 | element = wobj->package.elements; |
1099 | |
1100 | for (; prop <= HP_WMI_EVENT_PROPERTY_CATEGORY; prop++, element++) { |
1101 | type = hp_wmi_event_property_map[prop]; |
1102 | |
1103 | err = extract_acpi_value(dev, element, type, out_value: &value, out_string: &string); |
1104 | if (err) |
1105 | return err; |
1106 | |
1107 | switch (prop) { |
1108 | case HP_WMI_EVENT_PROPERTY_NAME: |
1109 | event->name = string; |
1110 | break; |
1111 | |
1112 | case HP_WMI_EVENT_PROPERTY_DESCRIPTION: |
1113 | event->description = string; |
1114 | break; |
1115 | |
1116 | case HP_WMI_EVENT_PROPERTY_CATEGORY: |
1117 | event->category = value; |
1118 | break; |
1119 | |
1120 | default: |
1121 | return -EINVAL; |
1122 | } |
1123 | } |
1124 | |
1125 | return 0; |
1126 | } |
1127 | |
1128 | /* |
1129 | * classify_event - classify an event |
1130 | * @name: event name |
1131 | * @category: event category |
1132 | * |
1133 | * Classify instances of both HPBIOS_PlatformEvents and HPBIOS_BIOSEvent from |
1134 | * property values. Recognition criteria are based on multiple ACPI dumps [3]. |
1135 | * |
1136 | * Returns an enum hp_wmi_type value on success, |
1137 | * or a negative value if the event type is unsupported. |
1138 | */ |
1139 | static int classify_event(const char *event_name, u32 category) |
1140 | { |
1141 | if (category != HP_WMI_CATEGORY_SENSOR) |
1142 | return -EINVAL; |
1143 | |
1144 | /* Fan events have Name "X Stall". */ |
1145 | if (strstr(event_name, HP_WMI_PATTERN_FAN_ALARM)) |
1146 | return HP_WMI_TYPE_AIR_FLOW; |
1147 | |
1148 | /* Intrusion events have Name "Hood Intrusion". */ |
1149 | if (!strcmp(event_name, HP_WMI_PATTERN_INTRUSION_ALARM)) |
1150 | return HP_WMI_TYPE_INTRUSION; |
1151 | |
1152 | /* |
1153 | * Temperature events have Name either "Thermal Caution" or |
1154 | * "Thermal Critical". Deal only with "Thermal Critical" events. |
1155 | * |
1156 | * "Thermal Caution" events have Status "Stressed", informing us that |
1157 | * the OperationalStatus of the related sensor has become "Stressed". |
1158 | * However, this is already a fault condition that will clear itself |
1159 | * when the sensor recovers, so we have no further interest in them. |
1160 | */ |
1161 | if (!strcmp(event_name, HP_WMI_PATTERN_TEMP_ALARM)) |
1162 | return HP_WMI_TYPE_TEMPERATURE; |
1163 | |
1164 | return -EINVAL; |
1165 | } |
1166 | |
1167 | /* |
1168 | * interpret_info - interpret sensor for hwmon |
1169 | * @info: pointer to sensor info struct |
1170 | * |
1171 | * Should be called after the numeric sensor member has been updated. |
1172 | */ |
1173 | static void interpret_info(struct hp_wmi_info *info) |
1174 | { |
1175 | const struct hp_wmi_numeric_sensor *nsensor = &info->nsensor; |
1176 | |
1177 | info->cached_val = scale_numeric_sensor(nsensor); |
1178 | info->last_updated = jiffies; |
1179 | } |
1180 | |
1181 | /* |
1182 | * hp_wmi_update_info - poll WMI to update sensor info |
1183 | * @state: pointer to driver state |
1184 | * @info: pointer to sensor info struct |
1185 | * |
1186 | * Returns 0 on success, or a negative error code on error. |
1187 | */ |
1188 | static int hp_wmi_update_info(struct hp_wmi_sensors *state, |
1189 | struct hp_wmi_info *info) |
1190 | { |
1191 | struct hp_wmi_numeric_sensor *nsensor = &info->nsensor; |
1192 | struct device *dev = &state->wdev->dev; |
1193 | const union acpi_object *wobj; |
1194 | u8 instance = info->instance; |
1195 | int ret = 0; |
1196 | |
1197 | if (time_after(jiffies, info->last_updated + HZ)) { |
1198 | mutex_lock(&state->lock); |
1199 | |
1200 | wobj = hp_wmi_get_wobj(HP_WMI_NUMERIC_SENSOR_GUID, instance); |
1201 | if (!wobj) { |
1202 | ret = -EIO; |
1203 | goto out_unlock; |
1204 | } |
1205 | |
1206 | update_numeric_sensor_from_wobj(dev, nsensor, wobj); |
1207 | |
1208 | interpret_info(info); |
1209 | |
1210 | kfree(objp: wobj); |
1211 | |
1212 | out_unlock: |
1213 | mutex_unlock(lock: &state->lock); |
1214 | } |
1215 | |
1216 | return ret; |
1217 | } |
1218 | |
1219 | static int basic_string_show(struct seq_file *seqf, void *ignored) |
1220 | { |
1221 | const char *str = seqf->private; |
1222 | |
1223 | seq_printf(m: seqf, fmt: "%s\n" , str); |
1224 | |
1225 | return 0; |
1226 | } |
1227 | DEFINE_SHOW_ATTRIBUTE(basic_string); |
1228 | |
1229 | static int fungible_show(struct seq_file *seqf, enum hp_wmi_property prop) |
1230 | { |
1231 | struct hp_wmi_numeric_sensor *nsensor; |
1232 | struct hp_wmi_sensors *state; |
1233 | struct hp_wmi_info *info; |
1234 | int err; |
1235 | |
1236 | info = seqf->private; |
1237 | state = info->state; |
1238 | nsensor = &info->nsensor; |
1239 | |
1240 | err = hp_wmi_update_info(state, info); |
1241 | if (err) |
1242 | return err; |
1243 | |
1244 | switch (prop) { |
1245 | case HP_WMI_PROPERTY_OPERATIONAL_STATUS: |
1246 | seq_printf(m: seqf, fmt: "%u\n" , nsensor->operational_status); |
1247 | break; |
1248 | |
1249 | case HP_WMI_PROPERTY_CURRENT_STATE: |
1250 | seq_printf(m: seqf, fmt: "%s\n" , nsensor->current_state); |
1251 | break; |
1252 | |
1253 | case HP_WMI_PROPERTY_UNIT_MODIFIER: |
1254 | seq_printf(m: seqf, fmt: "%d\n" , nsensor->unit_modifier); |
1255 | break; |
1256 | |
1257 | case HP_WMI_PROPERTY_CURRENT_READING: |
1258 | seq_printf(m: seqf, fmt: "%u\n" , nsensor->current_reading); |
1259 | break; |
1260 | |
1261 | default: |
1262 | return -EOPNOTSUPP; |
1263 | } |
1264 | |
1265 | return 0; |
1266 | } |
1267 | |
1268 | static int operational_status_show(struct seq_file *seqf, void *ignored) |
1269 | { |
1270 | return fungible_show(seqf, prop: HP_WMI_PROPERTY_OPERATIONAL_STATUS); |
1271 | } |
1272 | DEFINE_SHOW_ATTRIBUTE(operational_status); |
1273 | |
1274 | static int current_state_show(struct seq_file *seqf, void *ignored) |
1275 | { |
1276 | return fungible_show(seqf, prop: HP_WMI_PROPERTY_CURRENT_STATE); |
1277 | } |
1278 | DEFINE_SHOW_ATTRIBUTE(current_state); |
1279 | |
1280 | static int possible_states_show(struct seq_file *seqf, void *ignored) |
1281 | { |
1282 | struct hp_wmi_numeric_sensor *nsensor = seqf->private; |
1283 | u8 i; |
1284 | |
1285 | for (i = 0; i < nsensor->size; i++) |
1286 | seq_printf(m: seqf, fmt: "%s%s" , i ? "," : "" , |
1287 | nsensor->possible_states[i]); |
1288 | |
1289 | seq_puts(m: seqf, s: "\n" ); |
1290 | |
1291 | return 0; |
1292 | } |
1293 | DEFINE_SHOW_ATTRIBUTE(possible_states); |
1294 | |
1295 | static int unit_modifier_show(struct seq_file *seqf, void *ignored) |
1296 | { |
1297 | return fungible_show(seqf, prop: HP_WMI_PROPERTY_UNIT_MODIFIER); |
1298 | } |
1299 | DEFINE_SHOW_ATTRIBUTE(unit_modifier); |
1300 | |
1301 | static int current_reading_show(struct seq_file *seqf, void *ignored) |
1302 | { |
1303 | return fungible_show(seqf, prop: HP_WMI_PROPERTY_CURRENT_READING); |
1304 | } |
1305 | DEFINE_SHOW_ATTRIBUTE(current_reading); |
1306 | |
1307 | /* hp_wmi_devm_debugfs_remove - devm callback for debugfs cleanup */ |
1308 | static void hp_wmi_devm_debugfs_remove(void *res) |
1309 | { |
1310 | debugfs_remove_recursive(dentry: res); |
1311 | } |
1312 | |
1313 | /* hp_wmi_debugfs_init - create and populate debugfs directory tree */ |
1314 | static void hp_wmi_debugfs_init(struct device *dev, struct hp_wmi_info *info, |
1315 | struct hp_wmi_platform_events *pevents, |
1316 | u8 icount, u8 pcount, bool is_new) |
1317 | { |
1318 | struct hp_wmi_numeric_sensor *nsensor; |
1319 | char buf[HP_WMI_MAX_STR_SIZE]; |
1320 | struct dentry *debugfs; |
1321 | struct dentry *entries; |
1322 | struct dentry *dir; |
1323 | int err; |
1324 | u8 i; |
1325 | |
1326 | /* dev_name() gives a not-very-friendly GUID for WMI devices. */ |
1327 | scnprintf(buf, size: sizeof(buf), fmt: "hp-wmi-sensors-%u" , dev->id); |
1328 | |
1329 | debugfs = debugfs_create_dir(name: buf, NULL); |
1330 | if (IS_ERR(ptr: debugfs)) |
1331 | return; |
1332 | |
1333 | err = devm_add_action_or_reset(dev, hp_wmi_devm_debugfs_remove, |
1334 | debugfs); |
1335 | if (err) |
1336 | return; |
1337 | |
1338 | entries = debugfs_create_dir(name: "sensor" , parent: debugfs); |
1339 | |
1340 | for (i = 0; i < icount; i++, info++) { |
1341 | nsensor = &info->nsensor; |
1342 | |
1343 | scnprintf(buf, size: sizeof(buf), fmt: "%u" , i); |
1344 | dir = debugfs_create_dir(name: buf, parent: entries); |
1345 | |
1346 | debugfs_create_file(name: "name" , mode: 0444, parent: dir, |
1347 | data: (void *)nsensor->name, |
1348 | fops: &basic_string_fops); |
1349 | |
1350 | debugfs_create_file(name: "description" , mode: 0444, parent: dir, |
1351 | data: (void *)nsensor->description, |
1352 | fops: &basic_string_fops); |
1353 | |
1354 | debugfs_create_u32(name: "sensor_type" , mode: 0444, parent: dir, |
1355 | value: &nsensor->sensor_type); |
1356 | |
1357 | debugfs_create_file(name: "other_sensor_type" , mode: 0444, parent: dir, |
1358 | data: (void *)nsensor->other_sensor_type, |
1359 | fops: &basic_string_fops); |
1360 | |
1361 | debugfs_create_file(name: "operational_status" , mode: 0444, parent: dir, |
1362 | data: info, fops: &operational_status_fops); |
1363 | |
1364 | debugfs_create_file(name: "possible_states" , mode: 0444, parent: dir, |
1365 | data: nsensor, fops: &possible_states_fops); |
1366 | |
1367 | debugfs_create_file(name: "current_state" , mode: 0444, parent: dir, |
1368 | data: info, fops: ¤t_state_fops); |
1369 | |
1370 | debugfs_create_u32(name: "base_units" , mode: 0444, parent: dir, |
1371 | value: &nsensor->base_units); |
1372 | |
1373 | debugfs_create_file(name: "unit_modifier" , mode: 0444, parent: dir, |
1374 | data: info, fops: &unit_modifier_fops); |
1375 | |
1376 | debugfs_create_file(name: "current_reading" , mode: 0444, parent: dir, |
1377 | data: info, fops: ¤t_reading_fops); |
1378 | |
1379 | if (is_new) |
1380 | debugfs_create_u32(name: "rate_units" , mode: 0444, parent: dir, |
1381 | value: &nsensor->rate_units); |
1382 | } |
1383 | |
1384 | if (!pcount) |
1385 | return; |
1386 | |
1387 | entries = debugfs_create_dir(name: "platform_events" , parent: debugfs); |
1388 | |
1389 | for (i = 0; i < pcount; i++, pevents++) { |
1390 | scnprintf(buf, size: sizeof(buf), fmt: "%u" , i); |
1391 | dir = debugfs_create_dir(name: buf, parent: entries); |
1392 | |
1393 | debugfs_create_file(name: "name" , mode: 0444, parent: dir, |
1394 | data: (void *)pevents->name, |
1395 | fops: &basic_string_fops); |
1396 | |
1397 | debugfs_create_file(name: "description" , mode: 0444, parent: dir, |
1398 | data: (void *)pevents->description, |
1399 | fops: &basic_string_fops); |
1400 | |
1401 | debugfs_create_file(name: "source_namespace" , mode: 0444, parent: dir, |
1402 | data: (void *)pevents->source_namespace, |
1403 | fops: &basic_string_fops); |
1404 | |
1405 | debugfs_create_file(name: "source_class" , mode: 0444, parent: dir, |
1406 | data: (void *)pevents->source_class, |
1407 | fops: &basic_string_fops); |
1408 | |
1409 | debugfs_create_u32(name: "category" , mode: 0444, parent: dir, |
1410 | value: &pevents->category); |
1411 | |
1412 | debugfs_create_u32(name: "possible_severity" , mode: 0444, parent: dir, |
1413 | value: &pevents->possible_severity); |
1414 | |
1415 | debugfs_create_u32(name: "possible_status" , mode: 0444, parent: dir, |
1416 | value: &pevents->possible_status); |
1417 | } |
1418 | } |
1419 | |
1420 | static umode_t hp_wmi_hwmon_is_visible(const void *drvdata, |
1421 | enum hwmon_sensor_types type, |
1422 | u32 attr, int channel) |
1423 | { |
1424 | const struct hp_wmi_sensors *state = drvdata; |
1425 | const struct hp_wmi_info *info; |
1426 | |
1427 | if (type == hwmon_intrusion) |
1428 | return state->has_intrusion ? 0644 : 0; |
1429 | |
1430 | if (!state->info_map[type] || !state->info_map[type][channel]) |
1431 | return 0; |
1432 | |
1433 | info = state->info_map[type][channel]; |
1434 | |
1435 | if ((type == hwmon_temp && attr == hwmon_temp_alarm) || |
1436 | (type == hwmon_fan && attr == hwmon_fan_alarm)) |
1437 | return info->has_alarm ? 0444 : 0; |
1438 | |
1439 | return 0444; |
1440 | } |
1441 | |
1442 | static int hp_wmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, |
1443 | u32 attr, int channel, long *out_val) |
1444 | { |
1445 | struct hp_wmi_sensors *state = dev_get_drvdata(dev); |
1446 | const struct hp_wmi_numeric_sensor *nsensor; |
1447 | struct hp_wmi_info *info; |
1448 | int err; |
1449 | |
1450 | if (type == hwmon_intrusion) { |
1451 | *out_val = state->intrusion ? 1 : 0; |
1452 | |
1453 | return 0; |
1454 | } |
1455 | |
1456 | info = state->info_map[type][channel]; |
1457 | |
1458 | if ((type == hwmon_temp && attr == hwmon_temp_alarm) || |
1459 | (type == hwmon_fan && attr == hwmon_fan_alarm)) { |
1460 | *out_val = info->alarm ? 1 : 0; |
1461 | info->alarm = false; |
1462 | |
1463 | return 0; |
1464 | } |
1465 | |
1466 | nsensor = &info->nsensor; |
1467 | |
1468 | err = hp_wmi_update_info(state, info); |
1469 | if (err) |
1470 | return err; |
1471 | |
1472 | if ((type == hwmon_temp && attr == hwmon_temp_fault) || |
1473 | (type == hwmon_fan && attr == hwmon_fan_fault)) |
1474 | *out_val = numeric_sensor_has_fault(nsensor); |
1475 | else |
1476 | *out_val = info->cached_val; |
1477 | |
1478 | return 0; |
1479 | } |
1480 | |
1481 | static int hp_wmi_hwmon_read_string(struct device *dev, |
1482 | enum hwmon_sensor_types type, u32 attr, |
1483 | int channel, const char **out_str) |
1484 | { |
1485 | const struct hp_wmi_sensors *state = dev_get_drvdata(dev); |
1486 | const struct hp_wmi_info *info; |
1487 | |
1488 | info = state->info_map[type][channel]; |
1489 | *out_str = info->nsensor.name; |
1490 | |
1491 | return 0; |
1492 | } |
1493 | |
1494 | static int hp_wmi_hwmon_write(struct device *dev, enum hwmon_sensor_types type, |
1495 | u32 attr, int channel, long val) |
1496 | { |
1497 | struct hp_wmi_sensors *state = dev_get_drvdata(dev); |
1498 | |
1499 | if (val) |
1500 | return -EINVAL; |
1501 | |
1502 | mutex_lock(&state->lock); |
1503 | |
1504 | state->intrusion = false; |
1505 | |
1506 | mutex_unlock(lock: &state->lock); |
1507 | |
1508 | return 0; |
1509 | } |
1510 | |
1511 | static const struct hwmon_ops hp_wmi_hwmon_ops = { |
1512 | .is_visible = hp_wmi_hwmon_is_visible, |
1513 | .read = hp_wmi_hwmon_read, |
1514 | .read_string = hp_wmi_hwmon_read_string, |
1515 | .write = hp_wmi_hwmon_write, |
1516 | }; |
1517 | |
1518 | static struct hwmon_chip_info hp_wmi_chip_info = { |
1519 | .ops = &hp_wmi_hwmon_ops, |
1520 | .info = NULL, |
1521 | }; |
1522 | |
1523 | static struct hp_wmi_info *match_fan_event(struct hp_wmi_sensors *state, |
1524 | const char *event_description) |
1525 | { |
1526 | struct hp_wmi_info **ptr_info = state->info_map[hwmon_fan]; |
1527 | u8 fan_count = state->channel_count[hwmon_fan]; |
1528 | struct hp_wmi_info *info; |
1529 | const char *name; |
1530 | u8 i; |
1531 | |
1532 | /* Fan event has Description "X Speed". Sensor has Name "X[ Speed]". */ |
1533 | |
1534 | for (i = 0; i < fan_count; i++, ptr_info++) { |
1535 | info = *ptr_info; |
1536 | name = info->nsensor.name; |
1537 | |
1538 | if (strstr(event_description, name)) |
1539 | return info; |
1540 | } |
1541 | |
1542 | return NULL; |
1543 | } |
1544 | |
1545 | static u8 match_temp_events(struct hp_wmi_sensors *state, |
1546 | const char *event_description, |
1547 | struct hp_wmi_info *temp_info[]) |
1548 | { |
1549 | struct hp_wmi_info **ptr_info = state->info_map[hwmon_temp]; |
1550 | u8 temp_count = state->channel_count[hwmon_temp]; |
1551 | struct hp_wmi_info *info; |
1552 | const char *name; |
1553 | u8 count = 0; |
1554 | bool is_cpu; |
1555 | bool is_sys; |
1556 | u8 i; |
1557 | |
1558 | /* Description is either "CPU Thermal Index" or "Chassis Thermal Index". */ |
1559 | |
1560 | is_cpu = !strcmp(event_description, HP_WMI_PATTERN_CPU_TEMP); |
1561 | is_sys = !strcmp(event_description, HP_WMI_PATTERN_SYS_TEMP); |
1562 | if (!is_cpu && !is_sys) |
1563 | return 0; |
1564 | |
1565 | /* |
1566 | * CPU event: Match one sensor with Name either "CPU Thermal Index" or |
1567 | * "CPU Temperature", or multiple with Name(s) "CPU[#] Temperature". |
1568 | * |
1569 | * Chassis event: Match one sensor with Name either |
1570 | * "Chassis Thermal Index" or "System Ambient Temperature". |
1571 | */ |
1572 | |
1573 | for (i = 0; i < temp_count; i++, ptr_info++) { |
1574 | info = *ptr_info; |
1575 | name = info->nsensor.name; |
1576 | |
1577 | if ((is_cpu && (!strcmp(name, HP_WMI_PATTERN_CPU_TEMP) || |
1578 | !strcmp(name, HP_WMI_PATTERN_CPU_TEMP2))) || |
1579 | (is_sys && (!strcmp(name, HP_WMI_PATTERN_SYS_TEMP) || |
1580 | !strcmp(name, HP_WMI_PATTERN_SYS_TEMP2)))) { |
1581 | temp_info[0] = info; |
1582 | return 1; |
1583 | } |
1584 | |
1585 | if (is_cpu && (strstr(name, HP_WMI_PATTERN_CPU) && |
1586 | strstr(name, HP_WMI_PATTERN_TEMP))) |
1587 | temp_info[count++] = info; |
1588 | } |
1589 | |
1590 | return count; |
1591 | } |
1592 | |
1593 | /* hp_wmi_devm_debugfs_remove - devm callback for WMI event handler removal */ |
1594 | static void hp_wmi_devm_notify_remove(void *ignored) |
1595 | { |
1596 | wmi_remove_notify_handler(HP_WMI_EVENT_GUID); |
1597 | } |
1598 | |
1599 | /* hp_wmi_notify - WMI event notification handler */ |
1600 | static void hp_wmi_notify(u32 value, void *context) |
1601 | { |
1602 | struct hp_wmi_info *temp_info[HP_WMI_MAX_INSTANCES] = {}; |
1603 | struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; |
1604 | struct hp_wmi_sensors *state = context; |
1605 | struct device *dev = &state->wdev->dev; |
1606 | struct hp_wmi_event event = {}; |
1607 | struct hp_wmi_info *fan_info; |
1608 | union acpi_object *wobj; |
1609 | acpi_status err; |
1610 | int event_type; |
1611 | u8 count; |
1612 | |
1613 | /* |
1614 | * The following warning may occur in the kernel log: |
1615 | * |
1616 | * ACPI Warning: \_SB.WMID._WED: Return type mismatch - |
1617 | * found Package, expected Integer/String/Buffer |
1618 | * |
1619 | * After using [4] to decode BMOF blobs found in [3], careless copying |
1620 | * of BIOS code seems the most likely explanation for this warning. |
1621 | * HP_WMI_EVENT_GUID refers to \\.\root\WMI\HPBIOS_BIOSEvent on |
1622 | * business-class systems, but it refers to \\.\root\WMI\hpqBEvnt on |
1623 | * non-business-class systems. Per the existing hp-wmi driver, it |
1624 | * looks like an instance of hpqBEvnt delivered as event data may |
1625 | * indeed take the form of a raw ACPI_BUFFER on non-business-class |
1626 | * systems ("may" because ASL shows some BIOSes do strange things). |
1627 | * |
1628 | * In any case, we can ignore this warning, because we always validate |
1629 | * the event data to ensure it is an ACPI_PACKAGE containing a |
1630 | * HPBIOS_BIOSEvent instance. |
1631 | */ |
1632 | |
1633 | mutex_lock(&state->lock); |
1634 | |
1635 | err = wmi_get_event_data(event: value, out: &out); |
1636 | if (ACPI_FAILURE(err)) |
1637 | goto out_unlock; |
1638 | |
1639 | wobj = out.pointer; |
1640 | |
1641 | err = populate_event_from_wobj(dev, event: &event, wobj); |
1642 | if (err) { |
1643 | dev_warn(dev, "Bad event data (ACPI type %d)\n" , wobj->type); |
1644 | goto out_free_wobj; |
1645 | } |
1646 | |
1647 | event_type = classify_event(event_name: event.name, category: event.category); |
1648 | switch (event_type) { |
1649 | case HP_WMI_TYPE_AIR_FLOW: |
1650 | fan_info = match_fan_event(state, event_description: event.description); |
1651 | if (fan_info) |
1652 | fan_info->alarm = true; |
1653 | break; |
1654 | |
1655 | case HP_WMI_TYPE_INTRUSION: |
1656 | state->intrusion = true; |
1657 | break; |
1658 | |
1659 | case HP_WMI_TYPE_TEMPERATURE: |
1660 | count = match_temp_events(state, event_description: event.description, temp_info); |
1661 | while (count) |
1662 | temp_info[--count]->alarm = true; |
1663 | break; |
1664 | |
1665 | default: |
1666 | break; |
1667 | } |
1668 | |
1669 | out_free_wobj: |
1670 | kfree(objp: wobj); |
1671 | |
1672 | devm_kfree(dev, p: event.name); |
1673 | devm_kfree(dev, p: event.description); |
1674 | |
1675 | out_unlock: |
1676 | mutex_unlock(lock: &state->lock); |
1677 | } |
1678 | |
1679 | static int init_platform_events(struct device *dev, |
1680 | struct hp_wmi_platform_events **out_pevents, |
1681 | u8 *out_pcount) |
1682 | { |
1683 | struct hp_wmi_platform_events *pevents_arr; |
1684 | struct hp_wmi_platform_events *pevents; |
1685 | union acpi_object *wobj; |
1686 | u8 count; |
1687 | int err; |
1688 | u8 i; |
1689 | |
1690 | count = hp_wmi_wobj_instance_count(HP_WMI_PLATFORM_EVENTS_GUID); |
1691 | if (!count) { |
1692 | *out_pcount = 0; |
1693 | |
1694 | dev_dbg(dev, "No platform events\n" ); |
1695 | |
1696 | return 0; |
1697 | } |
1698 | |
1699 | pevents_arr = devm_kcalloc(dev, n: count, size: sizeof(*pevents), GFP_KERNEL); |
1700 | if (!pevents_arr) |
1701 | return -ENOMEM; |
1702 | |
1703 | for (i = 0, pevents = pevents_arr; i < count; i++, pevents++) { |
1704 | wobj = hp_wmi_get_wobj(HP_WMI_PLATFORM_EVENTS_GUID, instance: i); |
1705 | if (!wobj) |
1706 | return -EIO; |
1707 | |
1708 | err = populate_platform_events_from_wobj(dev, pevents, wobj); |
1709 | |
1710 | kfree(objp: wobj); |
1711 | |
1712 | if (err) |
1713 | return err; |
1714 | } |
1715 | |
1716 | *out_pevents = pevents_arr; |
1717 | *out_pcount = count; |
1718 | |
1719 | dev_dbg(dev, "Found %u platform events\n" , count); |
1720 | |
1721 | return 0; |
1722 | } |
1723 | |
1724 | static int init_numeric_sensors(struct hp_wmi_sensors *state, |
1725 | struct hp_wmi_info *connected[], |
1726 | struct hp_wmi_info **out_info, |
1727 | u8 *out_icount, u8 *out_count, |
1728 | bool *out_is_new) |
1729 | { |
1730 | struct hp_wmi_info ***info_map = state->info_map; |
1731 | u8 *channel_count = state->channel_count; |
1732 | struct device *dev = &state->wdev->dev; |
1733 | struct hp_wmi_numeric_sensor *nsensor; |
1734 | u8 channel_index[hwmon_max] = {}; |
1735 | enum hwmon_sensor_types type; |
1736 | struct hp_wmi_info *info_arr; |
1737 | struct hp_wmi_info *info; |
1738 | union acpi_object *wobj; |
1739 | u8 count = 0; |
1740 | bool is_new; |
1741 | u8 icount; |
1742 | int wtype; |
1743 | int err; |
1744 | u8 c; |
1745 | u8 i; |
1746 | |
1747 | icount = hp_wmi_wobj_instance_count(HP_WMI_NUMERIC_SENSOR_GUID); |
1748 | if (!icount) |
1749 | return -ENODATA; |
1750 | |
1751 | info_arr = devm_kcalloc(dev, n: icount, size: sizeof(*info), GFP_KERNEL); |
1752 | if (!info_arr) |
1753 | return -ENOMEM; |
1754 | |
1755 | for (i = 0, info = info_arr; i < icount; i++, info++) { |
1756 | wobj = hp_wmi_get_wobj(HP_WMI_NUMERIC_SENSOR_GUID, instance: i); |
1757 | if (!wobj) |
1758 | return -EIO; |
1759 | |
1760 | info->instance = i; |
1761 | info->state = state; |
1762 | nsensor = &info->nsensor; |
1763 | |
1764 | err = populate_numeric_sensor_from_wobj(dev, nsensor, wobj, |
1765 | out_is_new: &is_new); |
1766 | |
1767 | kfree(objp: wobj); |
1768 | |
1769 | if (err) |
1770 | return err; |
1771 | |
1772 | if (!numeric_sensor_is_connected(nsensor)) |
1773 | continue; |
1774 | |
1775 | wtype = classify_numeric_sensor(nsensor); |
1776 | if (wtype < 0) |
1777 | continue; |
1778 | |
1779 | type = hp_wmi_hwmon_type_map[wtype]; |
1780 | |
1781 | channel_count[type]++; |
1782 | |
1783 | info->type = type; |
1784 | |
1785 | interpret_info(info); |
1786 | |
1787 | connected[count++] = info; |
1788 | } |
1789 | |
1790 | dev_dbg(dev, "Found %u sensors (%u connected)\n" , i, count); |
1791 | |
1792 | for (i = 0; i < count; i++) { |
1793 | info = connected[i]; |
1794 | type = info->type; |
1795 | c = channel_index[type]++; |
1796 | |
1797 | if (!info_map[type]) { |
1798 | info_map[type] = devm_kcalloc(dev, n: channel_count[type], |
1799 | size: sizeof(*info_map), |
1800 | GFP_KERNEL); |
1801 | if (!info_map[type]) |
1802 | return -ENOMEM; |
1803 | } |
1804 | |
1805 | info_map[type][c] = info; |
1806 | } |
1807 | |
1808 | *out_info = info_arr; |
1809 | *out_icount = icount; |
1810 | *out_count = count; |
1811 | *out_is_new = is_new; |
1812 | |
1813 | return 0; |
1814 | } |
1815 | |
1816 | static bool find_event_attributes(struct hp_wmi_sensors *state, |
1817 | struct hp_wmi_platform_events *pevents, |
1818 | u8 pevents_count) |
1819 | { |
1820 | /* |
1821 | * The existence of this HPBIOS_PlatformEvents instance: |
1822 | * |
1823 | * { |
1824 | * Name = "Rear Chassis Fan0 Stall"; |
1825 | * Description = "Rear Chassis Fan0 Speed"; |
1826 | * Category = 3; // "Sensor" |
1827 | * PossibleSeverity = 25; // "Critical Failure" |
1828 | * PossibleStatus = 5; // "Predictive Failure" |
1829 | * [...] |
1830 | * } |
1831 | * |
1832 | * means that this HPBIOS_BIOSEvent instance may occur: |
1833 | * |
1834 | * { |
1835 | * Name = "Rear Chassis Fan0 Stall"; |
1836 | * Description = "Rear Chassis Fan0 Speed"; |
1837 | * Category = 3; // "Sensor" |
1838 | * Severity = 25; // "Critical Failure" |
1839 | * Status = 5; // "Predictive Failure" |
1840 | * } |
1841 | * |
1842 | * After the event occurs (e.g. because the fan was unplugged), |
1843 | * polling the related HPBIOS_BIOSNumericSensor instance gives: |
1844 | * |
1845 | * { |
1846 | * Name = "Rear Chassis Fan0"; |
1847 | * Description = "Reports rear chassis fan0 speed"; |
1848 | * OperationalStatus = 5; // "Predictive Failure", was 3 ("OK") |
1849 | * CurrentReading = 0; |
1850 | * [...] |
1851 | * } |
1852 | * |
1853 | * In this example, the hwmon fan channel for "Rear Chassis Fan0" |
1854 | * should support the alarm flag and have it be set if the related |
1855 | * HPBIOS_BIOSEvent instance occurs. |
1856 | * |
1857 | * In addition to fan events, temperature (CPU/chassis) and intrusion |
1858 | * events are relevant to hwmon [2]. Note that much information in [2] |
1859 | * is unreliable; it is referenced in addition to ACPI dumps [3] merely |
1860 | * to support the conclusion that sensor and event names/descriptions |
1861 | * are systematic enough to allow this driver to match them. |
1862 | * |
1863 | * Complications and limitations: |
1864 | * |
1865 | * - Strings are freeform and may vary, cf. sensor Name "CPU0 Fan" |
1866 | * on a Z420 vs. "CPU Fan Speed" on an EliteOne 800 G1. |
1867 | * - Leading/trailing whitespace is a rare but real possibility [3]. |
1868 | * - The HPBIOS_PlatformEvents object may not exist or its instances |
1869 | * may show that the system only has e.g. BIOS setting-related |
1870 | * events (cf. the ProBook 4540s and ProBook 470 G0 [3]). |
1871 | */ |
1872 | |
1873 | struct hp_wmi_info *temp_info[HP_WMI_MAX_INSTANCES] = {}; |
1874 | const char *event_description; |
1875 | struct hp_wmi_info *fan_info; |
1876 | bool has_events = false; |
1877 | const char *event_name; |
1878 | u32 event_category; |
1879 | int event_type; |
1880 | u8 count; |
1881 | u8 i; |
1882 | |
1883 | for (i = 0; i < pevents_count; i++, pevents++) { |
1884 | event_name = pevents->name; |
1885 | event_description = pevents->description; |
1886 | event_category = pevents->category; |
1887 | |
1888 | event_type = classify_event(event_name, category: event_category); |
1889 | switch (event_type) { |
1890 | case HP_WMI_TYPE_AIR_FLOW: |
1891 | fan_info = match_fan_event(state, event_description); |
1892 | if (!fan_info) |
1893 | break; |
1894 | |
1895 | fan_info->has_alarm = true; |
1896 | has_events = true; |
1897 | break; |
1898 | |
1899 | case HP_WMI_TYPE_INTRUSION: |
1900 | state->has_intrusion = true; |
1901 | has_events = true; |
1902 | break; |
1903 | |
1904 | case HP_WMI_TYPE_TEMPERATURE: |
1905 | count = match_temp_events(state, event_description, |
1906 | temp_info); |
1907 | if (!count) |
1908 | break; |
1909 | |
1910 | while (count) |
1911 | temp_info[--count]->has_alarm = true; |
1912 | has_events = true; |
1913 | break; |
1914 | |
1915 | default: |
1916 | break; |
1917 | } |
1918 | } |
1919 | |
1920 | return has_events; |
1921 | } |
1922 | |
1923 | static int make_chip_info(struct hp_wmi_sensors *state, bool has_events) |
1924 | { |
1925 | const struct hwmon_channel_info **ptr_channel_info; |
1926 | struct hp_wmi_info ***info_map = state->info_map; |
1927 | u8 *channel_count = state->channel_count; |
1928 | struct hwmon_channel_info *channel_info; |
1929 | struct device *dev = &state->wdev->dev; |
1930 | enum hwmon_sensor_types type; |
1931 | u8 type_count = 0; |
1932 | u32 *config; |
1933 | u32 attr; |
1934 | u8 count; |
1935 | u8 i; |
1936 | |
1937 | if (channel_count[hwmon_temp]) |
1938 | channel_count[hwmon_chip] = 1; |
1939 | |
1940 | if (has_events && state->has_intrusion) |
1941 | channel_count[hwmon_intrusion] = 1; |
1942 | |
1943 | for (type = hwmon_chip; type < hwmon_max; type++) |
1944 | if (channel_count[type]) |
1945 | type_count++; |
1946 | |
1947 | channel_info = devm_kcalloc(dev, n: type_count, |
1948 | size: sizeof(*channel_info), GFP_KERNEL); |
1949 | if (!channel_info) |
1950 | return -ENOMEM; |
1951 | |
1952 | ptr_channel_info = devm_kcalloc(dev, n: type_count + 1, |
1953 | size: sizeof(*ptr_channel_info), GFP_KERNEL); |
1954 | if (!ptr_channel_info) |
1955 | return -ENOMEM; |
1956 | |
1957 | hp_wmi_chip_info.info = ptr_channel_info; |
1958 | |
1959 | for (type = hwmon_chip; type < hwmon_max; type++) { |
1960 | count = channel_count[type]; |
1961 | if (!count) |
1962 | continue; |
1963 | |
1964 | config = devm_kcalloc(dev, n: count + 1, |
1965 | size: sizeof(*config), GFP_KERNEL); |
1966 | if (!config) |
1967 | return -ENOMEM; |
1968 | |
1969 | attr = hp_wmi_hwmon_attributes[type]; |
1970 | channel_info->type = type; |
1971 | channel_info->config = config; |
1972 | memset32(s: config, v: attr, n: count); |
1973 | |
1974 | *ptr_channel_info++ = channel_info++; |
1975 | |
1976 | if (!has_events || (type != hwmon_temp && type != hwmon_fan)) |
1977 | continue; |
1978 | |
1979 | attr = type == hwmon_temp ? HWMON_T_ALARM : HWMON_F_ALARM; |
1980 | |
1981 | for (i = 0; i < count; i++) |
1982 | if (info_map[type][i]->has_alarm) |
1983 | config[i] |= attr; |
1984 | } |
1985 | |
1986 | return 0; |
1987 | } |
1988 | |
1989 | static bool add_event_handler(struct hp_wmi_sensors *state) |
1990 | { |
1991 | struct device *dev = &state->wdev->dev; |
1992 | int err; |
1993 | |
1994 | err = wmi_install_notify_handler(HP_WMI_EVENT_GUID, |
1995 | handler: hp_wmi_notify, data: state); |
1996 | if (err) { |
1997 | dev_info(dev, "Failed to subscribe to WMI event\n" ); |
1998 | return false; |
1999 | } |
2000 | |
2001 | err = devm_add_action_or_reset(dev, hp_wmi_devm_notify_remove, NULL); |
2002 | if (err) |
2003 | return false; |
2004 | |
2005 | return true; |
2006 | } |
2007 | |
2008 | static int hp_wmi_sensors_init(struct hp_wmi_sensors *state) |
2009 | { |
2010 | struct hp_wmi_info *connected[HP_WMI_MAX_INSTANCES]; |
2011 | struct hp_wmi_platform_events *pevents = NULL; |
2012 | struct device *dev = &state->wdev->dev; |
2013 | struct hp_wmi_info *info; |
2014 | struct device *hwdev; |
2015 | bool has_events; |
2016 | bool is_new; |
2017 | u8 icount; |
2018 | u8 pcount; |
2019 | u8 count; |
2020 | int err; |
2021 | |
2022 | err = init_platform_events(dev, out_pevents: &pevents, out_pcount: &pcount); |
2023 | if (err) |
2024 | return err; |
2025 | |
2026 | err = init_numeric_sensors(state, connected, out_info: &info, |
2027 | out_icount: &icount, out_count: &count, out_is_new: &is_new); |
2028 | if (err) |
2029 | return err; |
2030 | |
2031 | if (IS_ENABLED(CONFIG_DEBUG_FS)) |
2032 | hp_wmi_debugfs_init(dev, info, pevents, icount, pcount, is_new); |
2033 | |
2034 | if (!count) |
2035 | return 0; /* No connected sensors; debugfs only. */ |
2036 | |
2037 | has_events = find_event_attributes(state, pevents, pevents_count: pcount); |
2038 | |
2039 | /* Survive failure to install WMI event handler. */ |
2040 | if (has_events && !add_event_handler(state)) |
2041 | has_events = false; |
2042 | |
2043 | err = make_chip_info(state, has_events); |
2044 | if (err) |
2045 | return err; |
2046 | |
2047 | hwdev = devm_hwmon_device_register_with_info(dev, name: "hp_wmi_sensors" , |
2048 | drvdata: state, info: &hp_wmi_chip_info, |
2049 | NULL); |
2050 | return PTR_ERR_OR_ZERO(ptr: hwdev); |
2051 | } |
2052 | |
2053 | static int hp_wmi_sensors_probe(struct wmi_device *wdev, const void *context) |
2054 | { |
2055 | struct device *dev = &wdev->dev; |
2056 | struct hp_wmi_sensors *state; |
2057 | |
2058 | state = devm_kzalloc(dev, size: sizeof(*state), GFP_KERNEL); |
2059 | if (!state) |
2060 | return -ENOMEM; |
2061 | |
2062 | state->wdev = wdev; |
2063 | |
2064 | mutex_init(&state->lock); |
2065 | |
2066 | dev_set_drvdata(dev, data: state); |
2067 | |
2068 | return hp_wmi_sensors_init(state); |
2069 | } |
2070 | |
2071 | static const struct wmi_device_id hp_wmi_sensors_id_table[] = { |
2072 | { HP_WMI_NUMERIC_SENSOR_GUID, NULL }, |
2073 | {}, |
2074 | }; |
2075 | |
2076 | static struct wmi_driver hp_wmi_sensors_driver = { |
2077 | .driver = { .name = "hp-wmi-sensors" }, |
2078 | .id_table = hp_wmi_sensors_id_table, |
2079 | .probe = hp_wmi_sensors_probe, |
2080 | }; |
2081 | module_wmi_driver(hp_wmi_sensors_driver); |
2082 | |
2083 | MODULE_AUTHOR("James Seo <james@equiv.tech>" ); |
2084 | MODULE_DESCRIPTION("HP WMI Sensors driver" ); |
2085 | MODULE_LICENSE("GPL" ); |
2086 | |