1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Sysfs interface for the universal power supply monitor class |
4 | * |
5 | * Copyright © 2007 David Woodhouse <dwmw2@infradead.org> |
6 | * Copyright © 2007 Anton Vorontsov <cbou@mail.ru> |
7 | * Copyright © 2004 Szabolcs Gyurko |
8 | * Copyright © 2003 Ian Molton <spyro@f2s.com> |
9 | * |
10 | * Modified: 2004, Oct Szabolcs Gyurko |
11 | */ |
12 | |
13 | #include <linux/ctype.h> |
14 | #include <linux/device.h> |
15 | #include <linux/power_supply.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/stat.h> |
18 | #include <linux/string_helpers.h> |
19 | |
20 | #include "power_supply.h" |
21 | |
22 | #define MAX_PROP_NAME_LEN 30 |
23 | |
24 | struct power_supply_attr { |
25 | const char *prop_name; |
26 | char attr_name[MAX_PROP_NAME_LEN + 1]; |
27 | struct device_attribute dev_attr; |
28 | const char * const *text_values; |
29 | int text_values_len; |
30 | }; |
31 | |
32 | #define _POWER_SUPPLY_ATTR(_name, _text, _len) \ |
33 | [POWER_SUPPLY_PROP_ ## _name] = \ |
34 | { \ |
35 | .prop_name = #_name, \ |
36 | .attr_name = #_name "\0", \ |
37 | .text_values = _text, \ |
38 | .text_values_len = _len, \ |
39 | } |
40 | |
41 | #define POWER_SUPPLY_ATTR(_name) _POWER_SUPPLY_ATTR(_name, NULL, 0) |
42 | #define _POWER_SUPPLY_ENUM_ATTR(_name, _text) \ |
43 | _POWER_SUPPLY_ATTR(_name, _text, ARRAY_SIZE(_text)) |
44 | #define POWER_SUPPLY_ENUM_ATTR(_name) \ |
45 | _POWER_SUPPLY_ENUM_ATTR(_name, POWER_SUPPLY_ ## _name ## _TEXT) |
46 | |
47 | static const char * const POWER_SUPPLY_TYPE_TEXT[] = { |
48 | [POWER_SUPPLY_TYPE_UNKNOWN] = "Unknown" , |
49 | [POWER_SUPPLY_TYPE_BATTERY] = "Battery" , |
50 | [POWER_SUPPLY_TYPE_UPS] = "UPS" , |
51 | [POWER_SUPPLY_TYPE_MAINS] = "Mains" , |
52 | [POWER_SUPPLY_TYPE_USB] = "USB" , |
53 | [POWER_SUPPLY_TYPE_USB_DCP] = "USB_DCP" , |
54 | [POWER_SUPPLY_TYPE_USB_CDP] = "USB_CDP" , |
55 | [POWER_SUPPLY_TYPE_USB_ACA] = "USB_ACA" , |
56 | [POWER_SUPPLY_TYPE_USB_TYPE_C] = "USB_C" , |
57 | [POWER_SUPPLY_TYPE_USB_PD] = "USB_PD" , |
58 | [POWER_SUPPLY_TYPE_USB_PD_DRP] = "USB_PD_DRP" , |
59 | [POWER_SUPPLY_TYPE_APPLE_BRICK_ID] = "BrickID" , |
60 | [POWER_SUPPLY_TYPE_WIRELESS] = "Wireless" , |
61 | }; |
62 | |
63 | static const char * const POWER_SUPPLY_USB_TYPE_TEXT[] = { |
64 | [POWER_SUPPLY_USB_TYPE_UNKNOWN] = "Unknown" , |
65 | [POWER_SUPPLY_USB_TYPE_SDP] = "SDP" , |
66 | [POWER_SUPPLY_USB_TYPE_DCP] = "DCP" , |
67 | [POWER_SUPPLY_USB_TYPE_CDP] = "CDP" , |
68 | [POWER_SUPPLY_USB_TYPE_ACA] = "ACA" , |
69 | [POWER_SUPPLY_USB_TYPE_C] = "C" , |
70 | [POWER_SUPPLY_USB_TYPE_PD] = "PD" , |
71 | [POWER_SUPPLY_USB_TYPE_PD_DRP] = "PD_DRP" , |
72 | [POWER_SUPPLY_USB_TYPE_PD_PPS] = "PD_PPS" , |
73 | [POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID] = "BrickID" , |
74 | }; |
75 | |
76 | static const char * const POWER_SUPPLY_STATUS_TEXT[] = { |
77 | [POWER_SUPPLY_STATUS_UNKNOWN] = "Unknown" , |
78 | [POWER_SUPPLY_STATUS_CHARGING] = "Charging" , |
79 | [POWER_SUPPLY_STATUS_DISCHARGING] = "Discharging" , |
80 | [POWER_SUPPLY_STATUS_NOT_CHARGING] = "Not charging" , |
81 | [POWER_SUPPLY_STATUS_FULL] = "Full" , |
82 | }; |
83 | |
84 | static const char * const POWER_SUPPLY_CHARGE_TYPE_TEXT[] = { |
85 | [POWER_SUPPLY_CHARGE_TYPE_UNKNOWN] = "Unknown" , |
86 | [POWER_SUPPLY_CHARGE_TYPE_NONE] = "N/A" , |
87 | [POWER_SUPPLY_CHARGE_TYPE_TRICKLE] = "Trickle" , |
88 | [POWER_SUPPLY_CHARGE_TYPE_FAST] = "Fast" , |
89 | [POWER_SUPPLY_CHARGE_TYPE_STANDARD] = "Standard" , |
90 | [POWER_SUPPLY_CHARGE_TYPE_ADAPTIVE] = "Adaptive" , |
91 | [POWER_SUPPLY_CHARGE_TYPE_CUSTOM] = "Custom" , |
92 | [POWER_SUPPLY_CHARGE_TYPE_LONGLIFE] = "Long Life" , |
93 | [POWER_SUPPLY_CHARGE_TYPE_BYPASS] = "Bypass" , |
94 | }; |
95 | |
96 | static const char * const POWER_SUPPLY_HEALTH_TEXT[] = { |
97 | [POWER_SUPPLY_HEALTH_UNKNOWN] = "Unknown" , |
98 | [POWER_SUPPLY_HEALTH_GOOD] = "Good" , |
99 | [POWER_SUPPLY_HEALTH_OVERHEAT] = "Overheat" , |
100 | [POWER_SUPPLY_HEALTH_DEAD] = "Dead" , |
101 | [POWER_SUPPLY_HEALTH_OVERVOLTAGE] = "Over voltage" , |
102 | [POWER_SUPPLY_HEALTH_UNSPEC_FAILURE] = "Unspecified failure" , |
103 | [POWER_SUPPLY_HEALTH_COLD] = "Cold" , |
104 | [POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE] = "Watchdog timer expire" , |
105 | [POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE] = "Safety timer expire" , |
106 | [POWER_SUPPLY_HEALTH_OVERCURRENT] = "Over current" , |
107 | [POWER_SUPPLY_HEALTH_CALIBRATION_REQUIRED] = "Calibration required" , |
108 | [POWER_SUPPLY_HEALTH_WARM] = "Warm" , |
109 | [POWER_SUPPLY_HEALTH_COOL] = "Cool" , |
110 | [POWER_SUPPLY_HEALTH_HOT] = "Hot" , |
111 | [POWER_SUPPLY_HEALTH_NO_BATTERY] = "No battery" , |
112 | }; |
113 | |
114 | static const char * const POWER_SUPPLY_TECHNOLOGY_TEXT[] = { |
115 | [POWER_SUPPLY_TECHNOLOGY_UNKNOWN] = "Unknown" , |
116 | [POWER_SUPPLY_TECHNOLOGY_NiMH] = "NiMH" , |
117 | [POWER_SUPPLY_TECHNOLOGY_LION] = "Li-ion" , |
118 | [POWER_SUPPLY_TECHNOLOGY_LIPO] = "Li-poly" , |
119 | [POWER_SUPPLY_TECHNOLOGY_LiFe] = "LiFe" , |
120 | [POWER_SUPPLY_TECHNOLOGY_NiCd] = "NiCd" , |
121 | [POWER_SUPPLY_TECHNOLOGY_LiMn] = "LiMn" , |
122 | }; |
123 | |
124 | static const char * const POWER_SUPPLY_CAPACITY_LEVEL_TEXT[] = { |
125 | [POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN] = "Unknown" , |
126 | [POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL] = "Critical" , |
127 | [POWER_SUPPLY_CAPACITY_LEVEL_LOW] = "Low" , |
128 | [POWER_SUPPLY_CAPACITY_LEVEL_NORMAL] = "Normal" , |
129 | [POWER_SUPPLY_CAPACITY_LEVEL_HIGH] = "High" , |
130 | [POWER_SUPPLY_CAPACITY_LEVEL_FULL] = "Full" , |
131 | }; |
132 | |
133 | static const char * const POWER_SUPPLY_SCOPE_TEXT[] = { |
134 | [POWER_SUPPLY_SCOPE_UNKNOWN] = "Unknown" , |
135 | [POWER_SUPPLY_SCOPE_SYSTEM] = "System" , |
136 | [POWER_SUPPLY_SCOPE_DEVICE] = "Device" , |
137 | }; |
138 | |
139 | static const char * const POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[] = { |
140 | [POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO] = "auto" , |
141 | [POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE] = "inhibit-charge" , |
142 | [POWER_SUPPLY_CHARGE_BEHAVIOUR_FORCE_DISCHARGE] = "force-discharge" , |
143 | }; |
144 | |
145 | static struct power_supply_attr power_supply_attrs[] = { |
146 | /* Properties of type `int' */ |
147 | POWER_SUPPLY_ENUM_ATTR(STATUS), |
148 | POWER_SUPPLY_ENUM_ATTR(CHARGE_TYPE), |
149 | POWER_SUPPLY_ENUM_ATTR(HEALTH), |
150 | POWER_SUPPLY_ATTR(PRESENT), |
151 | POWER_SUPPLY_ATTR(ONLINE), |
152 | POWER_SUPPLY_ATTR(AUTHENTIC), |
153 | POWER_SUPPLY_ENUM_ATTR(TECHNOLOGY), |
154 | POWER_SUPPLY_ATTR(CYCLE_COUNT), |
155 | POWER_SUPPLY_ATTR(VOLTAGE_MAX), |
156 | POWER_SUPPLY_ATTR(VOLTAGE_MIN), |
157 | POWER_SUPPLY_ATTR(VOLTAGE_MAX_DESIGN), |
158 | POWER_SUPPLY_ATTR(VOLTAGE_MIN_DESIGN), |
159 | POWER_SUPPLY_ATTR(VOLTAGE_NOW), |
160 | POWER_SUPPLY_ATTR(VOLTAGE_AVG), |
161 | POWER_SUPPLY_ATTR(VOLTAGE_OCV), |
162 | POWER_SUPPLY_ATTR(VOLTAGE_BOOT), |
163 | POWER_SUPPLY_ATTR(CURRENT_MAX), |
164 | POWER_SUPPLY_ATTR(CURRENT_NOW), |
165 | POWER_SUPPLY_ATTR(CURRENT_AVG), |
166 | POWER_SUPPLY_ATTR(CURRENT_BOOT), |
167 | POWER_SUPPLY_ATTR(POWER_NOW), |
168 | POWER_SUPPLY_ATTR(POWER_AVG), |
169 | POWER_SUPPLY_ATTR(CHARGE_FULL_DESIGN), |
170 | POWER_SUPPLY_ATTR(CHARGE_EMPTY_DESIGN), |
171 | POWER_SUPPLY_ATTR(CHARGE_FULL), |
172 | POWER_SUPPLY_ATTR(CHARGE_EMPTY), |
173 | POWER_SUPPLY_ATTR(CHARGE_NOW), |
174 | POWER_SUPPLY_ATTR(CHARGE_AVG), |
175 | POWER_SUPPLY_ATTR(CHARGE_COUNTER), |
176 | POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT), |
177 | POWER_SUPPLY_ATTR(CONSTANT_CHARGE_CURRENT_MAX), |
178 | POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE), |
179 | POWER_SUPPLY_ATTR(CONSTANT_CHARGE_VOLTAGE_MAX), |
180 | POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT), |
181 | POWER_SUPPLY_ATTR(CHARGE_CONTROL_LIMIT_MAX), |
182 | POWER_SUPPLY_ATTR(CHARGE_CONTROL_START_THRESHOLD), |
183 | POWER_SUPPLY_ATTR(CHARGE_CONTROL_END_THRESHOLD), |
184 | POWER_SUPPLY_ENUM_ATTR(CHARGE_BEHAVIOUR), |
185 | POWER_SUPPLY_ATTR(INPUT_CURRENT_LIMIT), |
186 | POWER_SUPPLY_ATTR(INPUT_VOLTAGE_LIMIT), |
187 | POWER_SUPPLY_ATTR(INPUT_POWER_LIMIT), |
188 | POWER_SUPPLY_ATTR(ENERGY_FULL_DESIGN), |
189 | POWER_SUPPLY_ATTR(ENERGY_EMPTY_DESIGN), |
190 | POWER_SUPPLY_ATTR(ENERGY_FULL), |
191 | POWER_SUPPLY_ATTR(ENERGY_EMPTY), |
192 | POWER_SUPPLY_ATTR(ENERGY_NOW), |
193 | POWER_SUPPLY_ATTR(ENERGY_AVG), |
194 | POWER_SUPPLY_ATTR(CAPACITY), |
195 | POWER_SUPPLY_ATTR(CAPACITY_ALERT_MIN), |
196 | POWER_SUPPLY_ATTR(CAPACITY_ALERT_MAX), |
197 | POWER_SUPPLY_ATTR(CAPACITY_ERROR_MARGIN), |
198 | POWER_SUPPLY_ENUM_ATTR(CAPACITY_LEVEL), |
199 | POWER_SUPPLY_ATTR(TEMP), |
200 | POWER_SUPPLY_ATTR(TEMP_MAX), |
201 | POWER_SUPPLY_ATTR(TEMP_MIN), |
202 | POWER_SUPPLY_ATTR(TEMP_ALERT_MIN), |
203 | POWER_SUPPLY_ATTR(TEMP_ALERT_MAX), |
204 | POWER_SUPPLY_ATTR(TEMP_AMBIENT), |
205 | POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MIN), |
206 | POWER_SUPPLY_ATTR(TEMP_AMBIENT_ALERT_MAX), |
207 | POWER_SUPPLY_ATTR(TIME_TO_EMPTY_NOW), |
208 | POWER_SUPPLY_ATTR(TIME_TO_EMPTY_AVG), |
209 | POWER_SUPPLY_ATTR(TIME_TO_FULL_NOW), |
210 | POWER_SUPPLY_ATTR(TIME_TO_FULL_AVG), |
211 | POWER_SUPPLY_ENUM_ATTR(TYPE), |
212 | POWER_SUPPLY_ATTR(USB_TYPE), |
213 | POWER_SUPPLY_ENUM_ATTR(SCOPE), |
214 | POWER_SUPPLY_ATTR(PRECHARGE_CURRENT), |
215 | POWER_SUPPLY_ATTR(CHARGE_TERM_CURRENT), |
216 | POWER_SUPPLY_ATTR(CALIBRATE), |
217 | POWER_SUPPLY_ATTR(MANUFACTURE_YEAR), |
218 | POWER_SUPPLY_ATTR(MANUFACTURE_MONTH), |
219 | POWER_SUPPLY_ATTR(MANUFACTURE_DAY), |
220 | /* Properties of type `const char *' */ |
221 | POWER_SUPPLY_ATTR(MODEL_NAME), |
222 | POWER_SUPPLY_ATTR(MANUFACTURER), |
223 | POWER_SUPPLY_ATTR(SERIAL_NUMBER), |
224 | }; |
225 | #define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs) |
226 | |
227 | static struct attribute * |
228 | __power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1]; |
229 | |
230 | static struct power_supply_attr *to_ps_attr(struct device_attribute *attr) |
231 | { |
232 | return container_of(attr, struct power_supply_attr, dev_attr); |
233 | } |
234 | |
235 | static enum power_supply_property dev_attr_psp(struct device_attribute *attr) |
236 | { |
237 | return to_ps_attr(attr) - power_supply_attrs; |
238 | } |
239 | |
240 | static ssize_t power_supply_show_usb_type(struct device *dev, |
241 | const struct power_supply_desc *desc, |
242 | union power_supply_propval *value, |
243 | char *buf) |
244 | { |
245 | enum power_supply_usb_type usb_type; |
246 | ssize_t count = 0; |
247 | bool match = false; |
248 | int i; |
249 | |
250 | for (i = 0; i < desc->num_usb_types; ++i) { |
251 | usb_type = desc->usb_types[i]; |
252 | |
253 | if (value->intval == usb_type) { |
254 | count += sysfs_emit_at(buf, at: count, fmt: "[%s] " , |
255 | POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); |
256 | match = true; |
257 | } else { |
258 | count += sysfs_emit_at(buf, at: count, fmt: "%s " , |
259 | POWER_SUPPLY_USB_TYPE_TEXT[usb_type]); |
260 | } |
261 | } |
262 | |
263 | if (!match) { |
264 | dev_warn(dev, "driver reporting unsupported connected type\n" ); |
265 | return -EINVAL; |
266 | } |
267 | |
268 | if (count) |
269 | buf[count - 1] = '\n'; |
270 | |
271 | return count; |
272 | } |
273 | |
274 | static ssize_t power_supply_show_property(struct device *dev, |
275 | struct device_attribute *attr, |
276 | char *buf) { |
277 | ssize_t ret; |
278 | struct power_supply *psy = dev_get_drvdata(dev); |
279 | struct power_supply_attr *ps_attr = to_ps_attr(attr); |
280 | enum power_supply_property psp = dev_attr_psp(attr); |
281 | union power_supply_propval value; |
282 | |
283 | if (psp == POWER_SUPPLY_PROP_TYPE) { |
284 | value.intval = psy->desc->type; |
285 | } else { |
286 | ret = power_supply_get_property(psy, psp, val: &value); |
287 | |
288 | if (ret < 0) { |
289 | if (ret == -ENODATA) |
290 | dev_dbg_ratelimited(dev, |
291 | "driver has no data for `%s' property\n" , |
292 | attr->attr.name); |
293 | else if (ret != -ENODEV && ret != -EAGAIN) |
294 | dev_err_ratelimited(dev, |
295 | "driver failed to report `%s' property: %zd\n" , |
296 | attr->attr.name, ret); |
297 | return ret; |
298 | } |
299 | } |
300 | |
301 | if (ps_attr->text_values_len > 0 && |
302 | value.intval < ps_attr->text_values_len && value.intval >= 0) { |
303 | return sysfs_emit(buf, fmt: "%s\n" , ps_attr->text_values[value.intval]); |
304 | } |
305 | |
306 | switch (psp) { |
307 | case POWER_SUPPLY_PROP_USB_TYPE: |
308 | ret = power_supply_show_usb_type(dev, desc: psy->desc, |
309 | value: &value, buf); |
310 | break; |
311 | case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER: |
312 | ret = sysfs_emit(buf, fmt: "%s\n" , value.strval); |
313 | break; |
314 | default: |
315 | ret = sysfs_emit(buf, fmt: "%d\n" , value.intval); |
316 | } |
317 | |
318 | return ret; |
319 | } |
320 | |
321 | static ssize_t power_supply_store_property(struct device *dev, |
322 | struct device_attribute *attr, |
323 | const char *buf, size_t count) { |
324 | ssize_t ret; |
325 | struct power_supply *psy = dev_get_drvdata(dev); |
326 | struct power_supply_attr *ps_attr = to_ps_attr(attr); |
327 | enum power_supply_property psp = dev_attr_psp(attr); |
328 | union power_supply_propval value; |
329 | |
330 | ret = -EINVAL; |
331 | if (ps_attr->text_values_len > 0) { |
332 | ret = __sysfs_match_string(array: ps_attr->text_values, |
333 | n: ps_attr->text_values_len, s: buf); |
334 | } |
335 | |
336 | /* |
337 | * If no match was found, then check to see if it is an integer. |
338 | * Integer values are valid for enums in addition to the text value. |
339 | */ |
340 | if (ret < 0) { |
341 | long long_val; |
342 | |
343 | ret = kstrtol(s: buf, base: 10, res: &long_val); |
344 | if (ret < 0) |
345 | return ret; |
346 | |
347 | ret = long_val; |
348 | } |
349 | |
350 | value.intval = ret; |
351 | |
352 | ret = power_supply_set_property(psy, psp, val: &value); |
353 | if (ret < 0) |
354 | return ret; |
355 | |
356 | return count; |
357 | } |
358 | |
359 | static umode_t power_supply_attr_is_visible(struct kobject *kobj, |
360 | struct attribute *attr, |
361 | int attrno) |
362 | { |
363 | struct device *dev = kobj_to_dev(kobj); |
364 | struct power_supply *psy = dev_get_drvdata(dev); |
365 | umode_t mode = S_IRUSR | S_IRGRP | S_IROTH; |
366 | int i; |
367 | |
368 | if (!power_supply_attrs[attrno].prop_name) |
369 | return 0; |
370 | |
371 | if (attrno == POWER_SUPPLY_PROP_TYPE) |
372 | return mode; |
373 | |
374 | for (i = 0; i < psy->desc->num_properties; i++) { |
375 | int property = psy->desc->properties[i]; |
376 | |
377 | if (property == attrno) { |
378 | if (psy->desc->property_is_writeable && |
379 | psy->desc->property_is_writeable(psy, property) > 0) |
380 | mode |= S_IWUSR; |
381 | |
382 | return mode; |
383 | } |
384 | } |
385 | |
386 | if (power_supply_battery_info_has_prop(info: psy->battery_info, psp: attrno)) |
387 | return mode; |
388 | |
389 | return 0; |
390 | } |
391 | |
392 | static const struct attribute_group power_supply_attr_group = { |
393 | .attrs = __power_supply_attrs, |
394 | .is_visible = power_supply_attr_is_visible, |
395 | }; |
396 | |
397 | static const struct attribute_group *power_supply_attr_groups[] = { |
398 | &power_supply_attr_group, |
399 | NULL, |
400 | }; |
401 | |
402 | void power_supply_init_attrs(struct device_type *dev_type) |
403 | { |
404 | int i; |
405 | |
406 | dev_type->groups = power_supply_attr_groups; |
407 | |
408 | for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++) { |
409 | struct device_attribute *attr; |
410 | |
411 | if (!power_supply_attrs[i].prop_name) { |
412 | pr_warn("%s: Property %d skipped because it is missing from power_supply_attrs\n" , |
413 | __func__, i); |
414 | sprintf(buf: power_supply_attrs[i].attr_name, fmt: "_err_%d" , i); |
415 | } else { |
416 | string_lower(dst: power_supply_attrs[i].attr_name, |
417 | src: power_supply_attrs[i].attr_name); |
418 | } |
419 | |
420 | attr = &power_supply_attrs[i].dev_attr; |
421 | |
422 | attr->attr.name = power_supply_attrs[i].attr_name; |
423 | attr->show = power_supply_show_property; |
424 | attr->store = power_supply_store_property; |
425 | __power_supply_attrs[i] = &attr->attr; |
426 | } |
427 | } |
428 | |
429 | static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env, |
430 | enum power_supply_property prop, char *prop_buf) |
431 | { |
432 | int ret = 0; |
433 | struct power_supply_attr *pwr_attr; |
434 | struct device_attribute *dev_attr; |
435 | char *line; |
436 | |
437 | pwr_attr = &power_supply_attrs[prop]; |
438 | dev_attr = &pwr_attr->dev_attr; |
439 | |
440 | ret = power_supply_show_property(dev: (struct device *)dev, attr: dev_attr, buf: prop_buf); |
441 | if (ret == -ENODEV || ret == -ENODATA) { |
442 | /* |
443 | * When a battery is absent, we expect -ENODEV. Don't abort; |
444 | * send the uevent with at least the PRESENT=0 property |
445 | */ |
446 | return 0; |
447 | } |
448 | |
449 | if (ret < 0) |
450 | return ret; |
451 | |
452 | line = strchr(prop_buf, '\n'); |
453 | if (line) |
454 | *line = 0; |
455 | |
456 | return add_uevent_var(env, format: "POWER_SUPPLY_%s=%s" , |
457 | pwr_attr->prop_name, prop_buf); |
458 | } |
459 | |
460 | int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env) |
461 | { |
462 | const struct power_supply *psy = dev_get_drvdata(dev); |
463 | const enum power_supply_property *battery_props = |
464 | power_supply_battery_info_properties; |
465 | unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT / |
466 | sizeof(unsigned long) + 1] = {0}; |
467 | int ret = 0, j; |
468 | char *prop_buf; |
469 | |
470 | if (!psy || !psy->desc) { |
471 | dev_dbg(dev, "No power supply yet\n" ); |
472 | return ret; |
473 | } |
474 | |
475 | ret = add_uevent_var(env, format: "POWER_SUPPLY_NAME=%s" , psy->desc->name); |
476 | if (ret) |
477 | return ret; |
478 | |
479 | /* |
480 | * Kernel generates KOBJ_REMOVE uevent in device removal path, after |
481 | * resources have been freed. Exit early to avoid use-after-free. |
482 | */ |
483 | if (psy->removing) |
484 | return 0; |
485 | |
486 | prop_buf = (char *)get_zeroed_page(GFP_KERNEL); |
487 | if (!prop_buf) |
488 | return -ENOMEM; |
489 | |
490 | ret = add_prop_uevent(dev, env, prop: POWER_SUPPLY_PROP_TYPE, prop_buf); |
491 | if (ret) |
492 | goto out; |
493 | |
494 | for (j = 0; j < psy->desc->num_properties; j++) { |
495 | set_bit(nr: psy->desc->properties[j], addr: psy_drv_properties); |
496 | ret = add_prop_uevent(dev, env, prop: psy->desc->properties[j], |
497 | prop_buf); |
498 | if (ret) |
499 | goto out; |
500 | } |
501 | |
502 | for (j = 0; j < power_supply_battery_info_properties_size; j++) { |
503 | if (test_bit(battery_props[j], psy_drv_properties)) |
504 | continue; |
505 | if (!power_supply_battery_info_has_prop(info: psy->battery_info, |
506 | psp: battery_props[j])) |
507 | continue; |
508 | ret = add_prop_uevent(dev, env, prop: battery_props[j], |
509 | prop_buf); |
510 | if (ret) |
511 | goto out; |
512 | } |
513 | |
514 | out: |
515 | free_page((unsigned long)prop_buf); |
516 | |
517 | return ret; |
518 | } |
519 | |
520 | ssize_t power_supply_charge_behaviour_show(struct device *dev, |
521 | unsigned int available_behaviours, |
522 | enum power_supply_charge_behaviour current_behaviour, |
523 | char *buf) |
524 | { |
525 | bool match = false, available, active; |
526 | ssize_t count = 0; |
527 | int i; |
528 | |
529 | for (i = 0; i < ARRAY_SIZE(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT); i++) { |
530 | available = available_behaviours & BIT(i); |
531 | active = i == current_behaviour; |
532 | |
533 | if (available && active) { |
534 | count += sysfs_emit_at(buf, at: count, fmt: "[%s] " , |
535 | POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); |
536 | match = true; |
537 | } else if (available) { |
538 | count += sysfs_emit_at(buf, at: count, fmt: "%s " , |
539 | POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT[i]); |
540 | } |
541 | } |
542 | |
543 | if (!match) { |
544 | dev_warn(dev, "driver reporting unsupported charge behaviour\n" ); |
545 | return -EINVAL; |
546 | } |
547 | |
548 | if (count) |
549 | buf[count - 1] = '\n'; |
550 | |
551 | return count; |
552 | } |
553 | EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_show); |
554 | |
555 | int power_supply_charge_behaviour_parse(unsigned int available_behaviours, const char *buf) |
556 | { |
557 | int i = sysfs_match_string(POWER_SUPPLY_CHARGE_BEHAVIOUR_TEXT, buf); |
558 | |
559 | if (i < 0) |
560 | return i; |
561 | |
562 | if (available_behaviours & BIT(i)) |
563 | return i; |
564 | |
565 | return -EINVAL; |
566 | } |
567 | EXPORT_SYMBOL_GPL(power_supply_charge_behaviour_parse); |
568 | |