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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
19#include "power_supply.h"
20
21
22
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24
25
26
27
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30
31
32
33#define POWER_SUPPLY_ATTR(_name) \
34{ \
35 .attr = { .name = #_name }, \
36 .show = power_supply_show_property, \
37 .store = power_supply_store_property, \
38}
39
40static struct device_attribute power_supply_attrs[];
41
42static const char * const power_supply_type_text[] = {
43 "Unknown", "Battery", "UPS", "Mains", "USB",
44 "USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
45 "USB_PD", "USB_PD_DRP", "BrickID"
46};
47
48static const char * const power_supply_usb_type_text[] = {
49 "Unknown", "SDP", "DCP", "CDP", "ACA", "C",
50 "PD", "PD_DRP", "PD_PPS", "BrickID"
51};
52
53static const char * const power_supply_status_text[] = {
54 "Unknown", "Charging", "Discharging", "Not charging", "Full"
55};
56
57static const char * const power_supply_charge_type_text[] = {
58 "Unknown", "N/A", "Trickle", "Fast", "Standard", "Adaptive", "Custom"
59};
60
61static const char * const power_supply_health_text[] = {
62 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
63 "Unspecified failure", "Cold", "Watchdog timer expire",
64 "Safety timer expire", "Over current"
65};
66
67static const char * const power_supply_technology_text[] = {
68 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
69 "LiMn"
70};
71
72static const char * const power_supply_capacity_level_text[] = {
73 "Unknown", "Critical", "Low", "Normal", "High", "Full"
74};
75
76static const char * const power_supply_scope_text[] = {
77 "Unknown", "System", "Device"
78};
79
80static ssize_t power_supply_show_usb_type(struct device *dev,
81 enum power_supply_usb_type *usb_types,
82 ssize_t num_usb_types,
83 union power_supply_propval *value,
84 char *buf)
85{
86 enum power_supply_usb_type usb_type;
87 ssize_t count = 0;
88 bool match = false;
89 int i;
90
91 for (i = 0; i < num_usb_types; ++i) {
92 usb_type = usb_types[i];
93
94 if (value->intval == usb_type) {
95 count += sprintf(buf + count, "[%s] ",
96 power_supply_usb_type_text[usb_type]);
97 match = true;
98 } else {
99 count += sprintf(buf + count, "%s ",
100 power_supply_usb_type_text[usb_type]);
101 }
102 }
103
104 if (!match) {
105 dev_warn(dev, "driver reporting unsupported connected type\n");
106 return -EINVAL;
107 }
108
109 if (count)
110 buf[count - 1] = '\n';
111
112 return count;
113}
114
115static ssize_t power_supply_show_property(struct device *dev,
116 struct device_attribute *attr,
117 char *buf) {
118 ssize_t ret;
119 struct power_supply *psy = dev_get_drvdata(dev);
120 enum power_supply_property psp = attr - power_supply_attrs;
121 union power_supply_propval value;
122
123 if (psp == POWER_SUPPLY_PROP_TYPE) {
124 value.intval = psy->desc->type;
125 } else {
126 ret = power_supply_get_property(psy, psp, &value);
127
128 if (ret < 0) {
129 if (ret == -ENODATA)
130 dev_dbg(dev, "driver has no data for `%s' property\n",
131 attr->attr.name);
132 else if (ret != -ENODEV && ret != -EAGAIN)
133 dev_err_ratelimited(dev,
134 "driver failed to report `%s' property: %zd\n",
135 attr->attr.name, ret);
136 return ret;
137 }
138 }
139
140 switch (psp) {
141 case POWER_SUPPLY_PROP_STATUS:
142 ret = sprintf(buf, "%s\n",
143 power_supply_status_text[value.intval]);
144 break;
145 case POWER_SUPPLY_PROP_CHARGE_TYPE:
146 ret = sprintf(buf, "%s\n",
147 power_supply_charge_type_text[value.intval]);
148 break;
149 case POWER_SUPPLY_PROP_HEALTH:
150 ret = sprintf(buf, "%s\n",
151 power_supply_health_text[value.intval]);
152 break;
153 case POWER_SUPPLY_PROP_TECHNOLOGY:
154 ret = sprintf(buf, "%s\n",
155 power_supply_technology_text[value.intval]);
156 break;
157 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
158 ret = sprintf(buf, "%s\n",
159 power_supply_capacity_level_text[value.intval]);
160 break;
161 case POWER_SUPPLY_PROP_TYPE:
162 ret = sprintf(buf, "%s\n",
163 power_supply_type_text[value.intval]);
164 break;
165 case POWER_SUPPLY_PROP_USB_TYPE:
166 ret = power_supply_show_usb_type(dev, psy->desc->usb_types,
167 psy->desc->num_usb_types,
168 &value, buf);
169 break;
170 case POWER_SUPPLY_PROP_SCOPE:
171 ret = sprintf(buf, "%s\n",
172 power_supply_scope_text[value.intval]);
173 break;
174 case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
175 ret = sprintf(buf, "%s\n", value.strval);
176 break;
177 default:
178 ret = sprintf(buf, "%d\n", value.intval);
179 }
180
181 return ret;
182}
183
184static ssize_t power_supply_store_property(struct device *dev,
185 struct device_attribute *attr,
186 const char *buf, size_t count) {
187 ssize_t ret;
188 struct power_supply *psy = dev_get_drvdata(dev);
189 enum power_supply_property psp = attr - power_supply_attrs;
190 union power_supply_propval value;
191
192 switch (psp) {
193 case POWER_SUPPLY_PROP_STATUS:
194 ret = sysfs_match_string(power_supply_status_text, buf);
195 break;
196 case POWER_SUPPLY_PROP_CHARGE_TYPE:
197 ret = sysfs_match_string(power_supply_charge_type_text, buf);
198 break;
199 case POWER_SUPPLY_PROP_HEALTH:
200 ret = sysfs_match_string(power_supply_health_text, buf);
201 break;
202 case POWER_SUPPLY_PROP_TECHNOLOGY:
203 ret = sysfs_match_string(power_supply_technology_text, buf);
204 break;
205 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
206 ret = sysfs_match_string(power_supply_capacity_level_text, buf);
207 break;
208 case POWER_SUPPLY_PROP_SCOPE:
209 ret = sysfs_match_string(power_supply_scope_text, buf);
210 break;
211 default:
212 ret = -EINVAL;
213 }
214
215
216
217
218
219 if (ret < 0) {
220 long long_val;
221
222 ret = kstrtol(buf, 10, &long_val);
223 if (ret < 0)
224 return ret;
225
226 ret = long_val;
227 }
228
229 value.intval = ret;
230
231 ret = power_supply_set_property(psy, psp, &value);
232 if (ret < 0)
233 return ret;
234
235 return count;
236}
237
238
239static struct device_attribute power_supply_attrs[] = {
240
241 POWER_SUPPLY_ATTR(status),
242 POWER_SUPPLY_ATTR(charge_type),
243 POWER_SUPPLY_ATTR(health),
244 POWER_SUPPLY_ATTR(present),
245 POWER_SUPPLY_ATTR(online),
246 POWER_SUPPLY_ATTR(authentic),
247 POWER_SUPPLY_ATTR(technology),
248 POWER_SUPPLY_ATTR(cycle_count),
249 POWER_SUPPLY_ATTR(voltage_max),
250 POWER_SUPPLY_ATTR(voltage_min),
251 POWER_SUPPLY_ATTR(voltage_max_design),
252 POWER_SUPPLY_ATTR(voltage_min_design),
253 POWER_SUPPLY_ATTR(voltage_now),
254 POWER_SUPPLY_ATTR(voltage_avg),
255 POWER_SUPPLY_ATTR(voltage_ocv),
256 POWER_SUPPLY_ATTR(voltage_boot),
257 POWER_SUPPLY_ATTR(current_max),
258 POWER_SUPPLY_ATTR(current_now),
259 POWER_SUPPLY_ATTR(current_avg),
260 POWER_SUPPLY_ATTR(current_boot),
261 POWER_SUPPLY_ATTR(power_now),
262 POWER_SUPPLY_ATTR(power_avg),
263 POWER_SUPPLY_ATTR(charge_full_design),
264 POWER_SUPPLY_ATTR(charge_empty_design),
265 POWER_SUPPLY_ATTR(charge_full),
266 POWER_SUPPLY_ATTR(charge_empty),
267 POWER_SUPPLY_ATTR(charge_now),
268 POWER_SUPPLY_ATTR(charge_avg),
269 POWER_SUPPLY_ATTR(charge_counter),
270 POWER_SUPPLY_ATTR(constant_charge_current),
271 POWER_SUPPLY_ATTR(constant_charge_current_max),
272 POWER_SUPPLY_ATTR(constant_charge_voltage),
273 POWER_SUPPLY_ATTR(constant_charge_voltage_max),
274 POWER_SUPPLY_ATTR(charge_control_limit),
275 POWER_SUPPLY_ATTR(charge_control_limit_max),
276 POWER_SUPPLY_ATTR(charge_control_start_threshold),
277 POWER_SUPPLY_ATTR(charge_control_end_threshold),
278 POWER_SUPPLY_ATTR(input_current_limit),
279 POWER_SUPPLY_ATTR(input_voltage_limit),
280 POWER_SUPPLY_ATTR(input_power_limit),
281 POWER_SUPPLY_ATTR(energy_full_design),
282 POWER_SUPPLY_ATTR(energy_empty_design),
283 POWER_SUPPLY_ATTR(energy_full),
284 POWER_SUPPLY_ATTR(energy_empty),
285 POWER_SUPPLY_ATTR(energy_now),
286 POWER_SUPPLY_ATTR(energy_avg),
287 POWER_SUPPLY_ATTR(capacity),
288 POWER_SUPPLY_ATTR(capacity_alert_min),
289 POWER_SUPPLY_ATTR(capacity_alert_max),
290 POWER_SUPPLY_ATTR(capacity_level),
291 POWER_SUPPLY_ATTR(temp),
292 POWER_SUPPLY_ATTR(temp_max),
293 POWER_SUPPLY_ATTR(temp_min),
294 POWER_SUPPLY_ATTR(temp_alert_min),
295 POWER_SUPPLY_ATTR(temp_alert_max),
296 POWER_SUPPLY_ATTR(temp_ambient),
297 POWER_SUPPLY_ATTR(temp_ambient_alert_min),
298 POWER_SUPPLY_ATTR(temp_ambient_alert_max),
299 POWER_SUPPLY_ATTR(time_to_empty_now),
300 POWER_SUPPLY_ATTR(time_to_empty_avg),
301 POWER_SUPPLY_ATTR(time_to_full_now),
302 POWER_SUPPLY_ATTR(time_to_full_avg),
303 POWER_SUPPLY_ATTR(type),
304 POWER_SUPPLY_ATTR(usb_type),
305 POWER_SUPPLY_ATTR(scope),
306 POWER_SUPPLY_ATTR(precharge_current),
307 POWER_SUPPLY_ATTR(charge_term_current),
308 POWER_SUPPLY_ATTR(calibrate),
309
310 POWER_SUPPLY_ATTR(model_name),
311 POWER_SUPPLY_ATTR(manufacturer),
312 POWER_SUPPLY_ATTR(serial_number),
313};
314
315static struct attribute *
316__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
317
318static umode_t power_supply_attr_is_visible(struct kobject *kobj,
319 struct attribute *attr,
320 int attrno)
321{
322 struct device *dev = container_of(kobj, struct device, kobj);
323 struct power_supply *psy = dev_get_drvdata(dev);
324 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
325 int i;
326
327 if (attrno == POWER_SUPPLY_PROP_TYPE)
328 return mode;
329
330 for (i = 0; i < psy->desc->num_properties; i++) {
331 int property = psy->desc->properties[i];
332
333 if (property == attrno) {
334 if (psy->desc->property_is_writeable &&
335 psy->desc->property_is_writeable(psy, property) > 0)
336 mode |= S_IWUSR;
337
338 return mode;
339 }
340 }
341
342 return 0;
343}
344
345static struct attribute_group power_supply_attr_group = {
346 .attrs = __power_supply_attrs,
347 .is_visible = power_supply_attr_is_visible,
348};
349
350static const struct attribute_group *power_supply_attr_groups[] = {
351 &power_supply_attr_group,
352 NULL,
353};
354
355void power_supply_init_attrs(struct device_type *dev_type)
356{
357 int i;
358
359 dev_type->groups = power_supply_attr_groups;
360
361 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
362 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
363}
364
365static char *kstruprdup(const char *str, gfp_t gfp)
366{
367 char *ret, *ustr;
368
369 ustr = ret = kmalloc(strlen(str) + 1, gfp);
370
371 if (!ret)
372 return NULL;
373
374 while (*str)
375 *ustr++ = toupper(*str++);
376
377 *ustr = 0;
378
379 return ret;
380}
381
382int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
383{
384 struct power_supply *psy = dev_get_drvdata(dev);
385 int ret = 0, j;
386 char *prop_buf;
387 char *attrname;
388
389 if (!psy || !psy->desc) {
390 dev_dbg(dev, "No power supply yet\n");
391 return ret;
392 }
393
394 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
395 if (ret)
396 return ret;
397
398 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
399 if (!prop_buf)
400 return -ENOMEM;
401
402 for (j = 0; j < psy->desc->num_properties; j++) {
403 struct device_attribute *attr;
404 char *line;
405
406 attr = &power_supply_attrs[psy->desc->properties[j]];
407
408 ret = power_supply_show_property(dev, attr, prop_buf);
409 if (ret == -ENODEV || ret == -ENODATA) {
410
411
412 ret = 0;
413 continue;
414 }
415
416 if (ret < 0)
417 goto out;
418
419 line = strchr(prop_buf, '\n');
420 if (line)
421 *line = 0;
422
423 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
424 if (!attrname) {
425 ret = -ENOMEM;
426 goto out;
427 }
428
429 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
430 kfree(attrname);
431 if (ret)
432 goto out;
433 }
434
435out:
436 free_page((unsigned long)prop_buf);
437
438 return ret;
439}
440
