tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Sysfs interface for the universal power supply monitor class
3 *
4 * Copyright © 2007 David Woodhouse <dwmw2@infradead.org>
5 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
6 * Copyright © 2004 Szabolcs Gyurko
7 * Copyright © 2003 Ian Molton <spyro@f2s.com>
8 *
9 * Modified: 2004, Oct Szabolcs Gyurko
10 *
11 * You may use this code as per GPL version 2
12 */
13
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 * This is because the name "current" breaks the device attr macro.
24 * The "current" word resolves to "(get_current())" so instead of
25 * "current" "(get_current())" appears in the sysfs.
26 *
27 * The source of this definition is the device.h which calls __ATTR
28 * macro in sysfs.h which calls the __stringify macro.
29 *
30 * Only modification that the name is not tried to be resolved
31 * (as a macro let's say).
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"
49 };
50 static char *status_text[] = {
51 "Unknown", "Charging", "Discharging", "Not charging", "Full"
52 };
53 static char *charge_type[] = {
54 "Unknown", "N/A", "Trickle", "Fast"
55 };
56 static char *health_text[] = {
57 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
58 "Unspecified failure", "Cold", "Watchdog timer expire",
59 "Safety timer expire"
60 };
61 static char *technology_text[] = {
62 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
63 "LiMn"
64 };
65 static char *capacity_level_text[] = {
66 "Unknown", "Critical", "Low", "Normal", "High", "Full"
67 };
68 static char *scope_text[] = {
69 "Unknown", "System", "Device"
70 };
71 ssize_t ret = 0;
72 struct power_supply *psy = dev_get_drvdata(dev);
73 const ptrdiff_t off = attr - power_supply_attrs;
74 union power_supply_propval value;
75
76 if (off == POWER_SUPPLY_PROP_TYPE)
77 value.intval = psy->type;
78 else
79 ret = psy->get_property(psy, off, &value);
80
81 if (ret < 0) {
82 if (ret == -ENODATA)
83 dev_dbg(dev, "driver has no data for `%s' property\n",
84 attr->attr.name);
85 else if (ret != -ENODEV)
86 dev_err(dev, "driver failed to report `%s' property: %zd\n",
87 attr->attr.name, ret);
88 return ret;
89 }
90
91 if (off == POWER_SUPPLY_PROP_STATUS)
92 return sprintf(buf, "%s\n", status_text[value.intval]);
93 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
94 return sprintf(buf, "%s\n", charge_type[value.intval]);
95 else if (off == POWER_SUPPLY_PROP_HEALTH)
96 return sprintf(buf, "%s\n", health_text[value.intval]);
97 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
98 return sprintf(buf, "%s\n", technology_text[value.intval]);
99 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
100 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
101 else if (off == POWER_SUPPLY_PROP_TYPE)
102 return sprintf(buf, "%s\n", type_text[value.intval]);
103 else if (off == POWER_SUPPLY_PROP_SCOPE)
104 return sprintf(buf, "%s\n", scope_text[value.intval]);
105 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
106 return sprintf(buf, "%s\n", value.strval);
107
108 return sprintf(buf, "%d\n", value.intval);
109}
110
111static ssize_t power_supply_store_property(struct device *dev,
112 struct device_attribute *attr,
113 const char *buf, size_t count) {
114 ssize_t ret;
115 struct power_supply *psy = dev_get_drvdata(dev);
116 const ptrdiff_t off = attr - power_supply_attrs;
117 union power_supply_propval value;
118 long long_val;
119
120 /* TODO: support other types than int */
121 ret = kstrtol(buf, 10, &long_val);
122 if (ret < 0)
123 return ret;
124
125 value.intval = long_val;
126
127 ret = psy->set_property(psy, off, &value);
128 if (ret < 0)
129 return ret;
130
131 return count;
132}
133
134/* Must be in the same order as POWER_SUPPLY_PROP_* */
135static struct device_attribute power_supply_attrs[] = {
136 /* Properties of type `int' */
137 POWER_SUPPLY_ATTR(status),
138 POWER_SUPPLY_ATTR(charge_type),
139 POWER_SUPPLY_ATTR(health),
140 POWER_SUPPLY_ATTR(present),
141 POWER_SUPPLY_ATTR(online),
142 POWER_SUPPLY_ATTR(authentic),
143 POWER_SUPPLY_ATTR(technology),
144 POWER_SUPPLY_ATTR(cycle_count),
145 POWER_SUPPLY_ATTR(voltage_max),
146 POWER_SUPPLY_ATTR(voltage_min),
147 POWER_SUPPLY_ATTR(voltage_max_design),
148 POWER_SUPPLY_ATTR(voltage_min_design),
149 POWER_SUPPLY_ATTR(voltage_now),
150 POWER_SUPPLY_ATTR(voltage_avg),
151 POWER_SUPPLY_ATTR(voltage_ocv),
152 POWER_SUPPLY_ATTR(current_max),
153 POWER_SUPPLY_ATTR(current_now),
154 POWER_SUPPLY_ATTR(current_avg),
155 POWER_SUPPLY_ATTR(power_now),
156 POWER_SUPPLY_ATTR(power_avg),
157 POWER_SUPPLY_ATTR(charge_full_design),
158 POWER_SUPPLY_ATTR(charge_empty_design),
159 POWER_SUPPLY_ATTR(charge_full),
160 POWER_SUPPLY_ATTR(charge_empty),
161 POWER_SUPPLY_ATTR(charge_now),
162 POWER_SUPPLY_ATTR(charge_avg),
163 POWER_SUPPLY_ATTR(charge_counter),
164 POWER_SUPPLY_ATTR(constant_charge_current),
165 POWER_SUPPLY_ATTR(constant_charge_current_max),
166 POWER_SUPPLY_ATTR(constant_charge_voltage),
167 POWER_SUPPLY_ATTR(constant_charge_voltage_max),
168 POWER_SUPPLY_ATTR(charge_control_limit),
169 POWER_SUPPLY_ATTR(charge_control_limit_max),
170 POWER_SUPPLY_ATTR(energy_full_design),
171 POWER_SUPPLY_ATTR(energy_empty_design),
172 POWER_SUPPLY_ATTR(energy_full),
173 POWER_SUPPLY_ATTR(energy_empty),
174 POWER_SUPPLY_ATTR(energy_now),
175 POWER_SUPPLY_ATTR(energy_avg),
176 POWER_SUPPLY_ATTR(capacity),
177 POWER_SUPPLY_ATTR(capacity_alert_min),
178 POWER_SUPPLY_ATTR(capacity_alert_max),
179 POWER_SUPPLY_ATTR(capacity_level),
180 POWER_SUPPLY_ATTR(temp),
181 POWER_SUPPLY_ATTR(temp_alert_min),
182 POWER_SUPPLY_ATTR(temp_alert_max),
183 POWER_SUPPLY_ATTR(temp_ambient),
184 POWER_SUPPLY_ATTR(temp_ambient_alert_min),
185 POWER_SUPPLY_ATTR(temp_ambient_alert_max),
186 POWER_SUPPLY_ATTR(time_to_empty_now),
187 POWER_SUPPLY_ATTR(time_to_empty_avg),
188 POWER_SUPPLY_ATTR(time_to_full_now),
189 POWER_SUPPLY_ATTR(time_to_full_avg),
190 POWER_SUPPLY_ATTR(type),
191 POWER_SUPPLY_ATTR(scope),
192 /* Properties of type `const char *' */
193 POWER_SUPPLY_ATTR(model_name),
194 POWER_SUPPLY_ATTR(manufacturer),
195 POWER_SUPPLY_ATTR(serial_number),
196};
197
198static struct attribute *
199__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
200
201static umode_t power_supply_attr_is_visible(struct kobject *kobj,
202 struct attribute *attr,
203 int attrno)
204{
205 struct device *dev = container_of(kobj, struct device, kobj);
206 struct power_supply *psy = dev_get_drvdata(dev);
207 umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
208 int i;
209
210 if (attrno == POWER_SUPPLY_PROP_TYPE)
211 return mode;
212
213 for (i = 0; i < psy->num_properties; i++) {
214 int property = psy->properties[i];
215
216 if (property == attrno) {
217 if (psy->property_is_writeable &&
218 psy->property_is_writeable(psy, property) > 0)
219 mode |= S_IWUSR;
220
221 return mode;
222 }
223 }
224
225 return 0;
226}
227
228static struct attribute_group power_supply_attr_group = {
229 .attrs = __power_supply_attrs,
230 .is_visible = power_supply_attr_is_visible,
231};
232
233static const struct attribute_group *power_supply_attr_groups[] = {
234 &power_supply_attr_group,
235 NULL,
236};
237
238void power_supply_init_attrs(struct device_type *dev_type)
239{
240 int i;
241
242 dev_type->groups = power_supply_attr_groups;
243
244 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
245 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
246}
247
248static char *kstruprdup(const char *str, gfp_t gfp)
249{
250 char *ret, *ustr;
251
252 ustr = ret = kmalloc(strlen(str) + 1, gfp);
253
254 if (!ret)
255 return NULL;
256
257 while (*str)
258 *ustr++ = toupper(*str++);
259
260 *ustr = 0;
261
262 return ret;
263}
264
265int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
266{
267 struct power_supply *psy = dev_get_drvdata(dev);
268 int ret = 0, j;
269 char *prop_buf;
270 char *attrname;
271
272 dev_dbg(dev, "uevent\n");
273
274 if (!psy || !psy->dev) {
275 dev_dbg(dev, "No power supply yet\n");
276 return ret;
277 }
278
279 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
280
281 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
282 if (ret)
283 return ret;
284
285 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
286 if (!prop_buf)
287 return -ENOMEM;
288
289 for (j = 0; j < psy->num_properties; j++) {
290 struct device_attribute *attr;
291 char *line;
292
293 attr = &power_supply_attrs[psy->properties[j]];
294
295 ret = power_supply_show_property(dev, attr, prop_buf);
296 if (ret == -ENODEV || ret == -ENODATA) {
297 /* When a battery is absent, we expect -ENODEV. Don't abort;
298 send the uevent with at least the the PRESENT=0 property */
299 ret = 0;
300 continue;
301 }
302
303 if (ret < 0)
304 goto out;
305
306 line = strchr(prop_buf, '\n');
307 if (line)
308 *line = 0;
309
310 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
311 if (!attrname) {
312 ret = -ENOMEM;
313 goto out;
314 }
315
316 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
317
318 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
319 kfree(attrname);
320 if (ret)
321 goto out;
322 }
323
324out:
325 free_page((unsigned long)prop_buf);
326
327 return ret;
328}