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14#include <linux/ctype.h>
15#include <linux/device.h>
16#include <linux/power_supply.h>
17#include <linux/slab.h>
18#include <linux/stat.h>
19
20#include "power_supply.h"
21
22
23
24
25
26
27
28
29
30
31
32
33
34#define POWER_SUPPLY_ATTR(_name) \
35{ \
36 .attr = { .name = #_name }, \
37 .show = power_supply_show_property, \
38 .store = power_supply_store_property, \
39}
40
41static struct device_attribute power_supply_attrs[];
42
43static const char * const power_supply_type_text[] = {
44 "Unknown", "Battery", "UPS", "Mains", "USB",
45 "USB_DCP", "USB_CDP", "USB_ACA", "USB_C",
46 "USB_PD", "USB_PD_DRP", "BrickID"
47};
48
49static const char * const power_supply_status_text[] = {
50 "Unknown", "Charging", "Discharging", "Not charging", "Full"
51};
52
53static const char * const power_supply_charge_type_text[] = {
54 "Unknown", "N/A", "Trickle", "Fast"
55};
56
57static const char * const power_supply_health_text[] = {
58 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
59 "Unspecified failure", "Cold", "Watchdog timer expire",
60 "Safety timer expire"
61};
62
63static const char * const power_supply_technology_text[] = {
64 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
65 "LiMn"
66};
67
68static const char * const power_supply_capacity_level_text[] = {
69 "Unknown", "Critical", "Low", "Normal", "High", "Full"
70};
71
72static const char * const power_supply_scope_text[] = {
73 "Unknown", "System", "Device"
74};
75
76static ssize_t power_supply_show_property(struct device *dev,
77 struct device_attribute *attr,
78 char *buf) {
79 ssize_t ret = 0;
80 struct power_supply *psy = dev_get_drvdata(dev);
81 const ptrdiff_t off = attr - power_supply_attrs;
82 union power_supply_propval value;
83
84 if (off == POWER_SUPPLY_PROP_TYPE) {
85 value.intval = psy->desc->type;
86 } else {
87 ret = power_supply_get_property(psy, off, &value);
88
89 if (ret < 0) {
90 if (ret == -ENODATA)
91 dev_dbg(dev, "driver has no data for `%s' property\n",
92 attr->attr.name);
93 else if (ret != -ENODEV && ret != -EAGAIN)
94 dev_err(dev, "driver failed to report `%s' property: %zd\n",
95 attr->attr.name, ret);
96 return ret;
97 }
98 }
99
100 if (off == POWER_SUPPLY_PROP_STATUS)
101 return sprintf(buf, "%s\n",
102 power_supply_status_text[value.intval]);
103 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
104 return sprintf(buf, "%s\n",
105 power_supply_charge_type_text[value.intval]);
106 else if (off == POWER_SUPPLY_PROP_HEALTH)
107 return sprintf(buf, "%s\n",
108 power_supply_health_text[value.intval]);
109 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
110 return sprintf(buf, "%s\n",
111 power_supply_technology_text[value.intval]);
112 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
113 return sprintf(buf, "%s\n",
114 power_supply_capacity_level_text[value.intval]);
115 else if (off == POWER_SUPPLY_PROP_TYPE)
116 return sprintf(buf, "%s\n",
117 power_supply_type_text[value.intval]);
118 else if (off == POWER_SUPPLY_PROP_SCOPE)
119 return sprintf(buf, "%s\n",
120 power_supply_scope_text[value.intval]);
121 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
122 return sprintf(buf, "%s\n", value.strval);
123
124 return sprintf(buf, "%d\n", value.intval);
125}
126
127static ssize_t power_supply_store_property(struct device *dev,
128 struct device_attribute *attr,
129 const char *buf, size_t count) {
130 ssize_t ret;
131 struct power_supply *psy = dev_get_drvdata(dev);
132 const ptrdiff_t off = attr - power_supply_attrs;
133 union power_supply_propval value;
134
135
136 switch (off) {
137 case POWER_SUPPLY_PROP_STATUS:
138 ret = sysfs_match_string(power_supply_status_text, buf);
139 break;
140 case POWER_SUPPLY_PROP_CHARGE_TYPE:
141 ret = sysfs_match_string(power_supply_charge_type_text, buf);
142 break;
143 case POWER_SUPPLY_PROP_HEALTH:
144 ret = sysfs_match_string(power_supply_health_text, buf);
145 break;
146 case POWER_SUPPLY_PROP_TECHNOLOGY:
147 ret = sysfs_match_string(power_supply_technology_text, buf);
148 break;
149 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
150 ret = sysfs_match_string(power_supply_capacity_level_text, buf);
151 break;
152 case POWER_SUPPLY_PROP_SCOPE:
153 ret = sysfs_match_string(power_supply_scope_text, buf);
154 break;
155 default:
156 ret = -EINVAL;
157 }
158
159
160
161
162
163 if (ret < 0) {
164 long long_val;
165
166 ret = kstrtol(buf, 10, &long_val);
167 if (ret < 0)
168 return ret;
169
170 ret = long_val;
171 }
172
173 value.intval = ret;
174
175 ret = power_supply_set_property(psy, off, &value);
176 if (ret < 0)
177 return ret;
178
179 return count;
180}
181
182
183static struct device_attribute power_supply_attrs[] = {
184
185 POWER_SUPPLY_ATTR(status),
186 POWER_SUPPLY_ATTR(charge_type),
187 POWER_SUPPLY_ATTR(health),
188 POWER_SUPPLY_ATTR(present),
189 POWER_SUPPLY_ATTR(online),
190 POWER_SUPPLY_ATTR(authentic),
191 POWER_SUPPLY_ATTR(technology),
192 POWER_SUPPLY_ATTR(cycle_count),
193 POWER_SUPPLY_ATTR(voltage_max),
194 POWER_SUPPLY_ATTR(voltage_min),
195 POWER_SUPPLY_ATTR(voltage_max_design),
196 POWER_SUPPLY_ATTR(voltage_min_design),
197 POWER_SUPPLY_ATTR(voltage_now),
198 POWER_SUPPLY_ATTR(voltage_avg),
199 POWER_SUPPLY_ATTR(voltage_ocv),
200 POWER_SUPPLY_ATTR(voltage_boot),
201 POWER_SUPPLY_ATTR(current_max),
202 POWER_SUPPLY_ATTR(current_now),
203 POWER_SUPPLY_ATTR(current_avg),
204 POWER_SUPPLY_ATTR(current_boot),
205 POWER_SUPPLY_ATTR(power_now),
206 POWER_SUPPLY_ATTR(power_avg),
207 POWER_SUPPLY_ATTR(charge_full_design),
208 POWER_SUPPLY_ATTR(charge_empty_design),
209 POWER_SUPPLY_ATTR(charge_full),
210 POWER_SUPPLY_ATTR(charge_empty),
211 POWER_SUPPLY_ATTR(charge_now),
212 POWER_SUPPLY_ATTR(charge_avg),
213 POWER_SUPPLY_ATTR(charge_counter),
214 POWER_SUPPLY_ATTR(constant_charge_current),
215 POWER_SUPPLY_ATTR(constant_charge_current_max),
216 POWER_SUPPLY_ATTR(constant_charge_voltage),
217 POWER_SUPPLY_ATTR(constant_charge_voltage_max),
218 POWER_SUPPLY_ATTR(charge_control_limit),
219 POWER_SUPPLY_ATTR(charge_control_limit_max),
220 POWER_SUPPLY_ATTR(input_current_limit),
221 POWER_SUPPLY_ATTR(energy_full_design),
222 POWER_SUPPLY_ATTR(energy_empty_design),
223 POWER_SUPPLY_ATTR(energy_full),
224 POWER_SUPPLY_ATTR(energy_empty),
225 POWER_SUPPLY_ATTR(energy_now),
226 POWER_SUPPLY_ATTR(energy_avg),
227 POWER_SUPPLY_ATTR(capacity),
228 POWER_SUPPLY_ATTR(capacity_alert_min),
229 POWER_SUPPLY_ATTR(capacity_alert_max),
230 POWER_SUPPLY_ATTR(capacity_level),
231 POWER_SUPPLY_ATTR(temp),
232 POWER_SUPPLY_ATTR(temp_max),
233 POWER_SUPPLY_ATTR(temp_min),
234 POWER_SUPPLY_ATTR(temp_alert_min),
235 POWER_SUPPLY_ATTR(temp_alert_max),
236 POWER_SUPPLY_ATTR(temp_ambient),
237 POWER_SUPPLY_ATTR(temp_ambient_alert_min),
238 POWER_SUPPLY_ATTR(temp_ambient_alert_max),
239 POWER_SUPPLY_ATTR(time_to_empty_now),
240 POWER_SUPPLY_ATTR(time_to_empty_avg),
241 POWER_SUPPLY_ATTR(time_to_full_now),
242 POWER_SUPPLY_ATTR(time_to_full_avg),
243 POWER_SUPPLY_ATTR(type),
244 POWER_SUPPLY_ATTR(scope),
245 POWER_SUPPLY_ATTR(precharge_current),
246 POWER_SUPPLY_ATTR(charge_term_current),
247 POWER_SUPPLY_ATTR(calibrate),
248
249 POWER_SUPPLY_ATTR(model_name),
250 POWER_SUPPLY_ATTR(manufacturer),
251 POWER_SUPPLY_ATTR(serial_number),
252};
253
254static struct attribute *
255__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
256
257static umode_t power_supply_attr_is_visible(struct kobject *kobj,
258 struct attribute *attr,
259 int attrno)
260{
261 struct device *dev = container_of(kobj, struct device, kobj);
262 struct power_supply *psy = dev_get_drvdata(dev);
263 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
264 int i;
265
266 if (attrno == POWER_SUPPLY_PROP_TYPE)
267 return mode;
268
269 for (i = 0; i < psy->desc->num_properties; i++) {
270 int property = psy->desc->properties[i];
271
272 if (property == attrno) {
273 if (psy->desc->property_is_writeable &&
274 psy->desc->property_is_writeable(psy, property) > 0)
275 mode |= S_IWUSR;
276
277 return mode;
278 }
279 }
280
281 return 0;
282}
283
284static struct attribute_group power_supply_attr_group = {
285 .attrs = __power_supply_attrs,
286 .is_visible = power_supply_attr_is_visible,
287};
288
289static const struct attribute_group *power_supply_attr_groups[] = {
290 &power_supply_attr_group,
291 NULL,
292};
293
294void power_supply_init_attrs(struct device_type *dev_type)
295{
296 int i;
297
298 dev_type->groups = power_supply_attr_groups;
299
300 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
301 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
302}
303
304static char *kstruprdup(const char *str, gfp_t gfp)
305{
306 char *ret, *ustr;
307
308 ustr = ret = kmalloc(strlen(str) + 1, gfp);
309
310 if (!ret)
311 return NULL;
312
313 while (*str)
314 *ustr++ = toupper(*str++);
315
316 *ustr = 0;
317
318 return ret;
319}
320
321int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
322{
323 struct power_supply *psy = dev_get_drvdata(dev);
324 int ret = 0, j;
325 char *prop_buf;
326 char *attrname;
327
328 dev_dbg(dev, "uevent\n");
329
330 if (!psy || !psy->desc) {
331 dev_dbg(dev, "No power supply yet\n");
332 return ret;
333 }
334
335 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name);
336
337 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
338 if (ret)
339 return ret;
340
341 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
342 if (!prop_buf)
343 return -ENOMEM;
344
345 for (j = 0; j < psy->desc->num_properties; j++) {
346 struct device_attribute *attr;
347 char *line;
348
349 attr = &power_supply_attrs[psy->desc->properties[j]];
350
351 ret = power_supply_show_property(dev, attr, prop_buf);
352 if (ret == -ENODEV || ret == -ENODATA) {
353
354
355 ret = 0;
356 continue;
357 }
358
359 if (ret < 0)
360 goto out;
361
362 line = strchr(prop_buf, '\n');
363 if (line)
364 *line = 0;
365
366 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
367 if (!attrname) {
368 ret = -ENOMEM;
369 goto out;
370 }
371
372 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
373
374 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
375 kfree(attrname);
376 if (ret)
377 goto out;
378 }
379
380out:
381 free_page((unsigned long)prop_buf);
382
383 return ret;
384}
385
