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