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Anton Vorontsov4a11b592007-05-04 00:27:45 +04001/*
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/power_supply.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Anton Vorontsov4a11b592007-05-04 00:27:45 +040017
Adrian Bunk25f12142007-11-26 00:25:45 +030018#include "power_supply.h"
19
Anton Vorontsov4a11b592007-05-04 00:27:45 +040020/*
21 * This is because the name "current" breaks the device attr macro.
22 * The "current" word resolves to "(get_current())" so instead of
23 * "current" "(get_current())" appears in the sysfs.
24 *
25 * The source of this definition is the device.h which calls __ATTR
26 * macro in sysfs.h which calls the __stringify macro.
27 *
28 * Only modification that the name is not tried to be resolved
29 * (as a macro let's say).
30 */
31
32#define POWER_SUPPLY_ATTR(_name) \
33{ \
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020034 .attr = { .name = #_name }, \
Anton Vorontsov4a11b592007-05-04 00:27:45 +040035 .show = power_supply_show_property, \
Daniel Mack0011d2d2010-05-18 21:49:52 +020036 .store = power_supply_store_property, \
Anton Vorontsov4a11b592007-05-04 00:27:45 +040037}
38
39static struct device_attribute power_supply_attrs[];
40
41static ssize_t power_supply_show_property(struct device *dev,
42 struct device_attribute *attr,
43 char *buf) {
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020044 static char *type_text[] = {
Heikki Krogerus85efc8a2010-10-04 10:51:37 +030045 "Battery", "UPS", "Mains", "USB",
46 "USB_DCP", "USB_CDP", "USB_ACA"
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020047 };
Anton Vorontsov4a11b592007-05-04 00:27:45 +040048 static char *status_text[] = {
49 "Unknown", "Charging", "Discharging", "Not charging", "Full"
50 };
Andres Salomonee8076e2009-07-02 09:45:18 -040051 static char *charge_type[] = {
52 "Unknown", "N/A", "Trickle", "Fast"
53 };
Anton Vorontsov4a11b592007-05-04 00:27:45 +040054 static char *health_text[] = {
55 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
Mark Brown7e386e62008-11-30 22:43:21 +010056 "Unspecified failure", "Cold",
Anton Vorontsov4a11b592007-05-04 00:27:45 +040057 };
58 static char *technology_text[] = {
Dmitry Baryshkovc7cc9302008-01-07 04:12:41 +030059 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd",
60 "LiMn"
Anton Vorontsov4a11b592007-05-04 00:27:45 +040061 };
Andres Salomonb294a292009-06-30 02:13:01 -040062 static char *capacity_level_text[] = {
63 "Unknown", "Critical", "Low", "Normal", "High", "Full"
64 };
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020065 ssize_t ret = 0;
Anton Vorontsov4a11b592007-05-04 00:27:45 +040066 struct power_supply *psy = dev_get_drvdata(dev);
67 const ptrdiff_t off = attr - power_supply_attrs;
68 union power_supply_propval value;
69
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020070 if (off == POWER_SUPPLY_PROP_TYPE)
71 value.intval = psy->type;
72 else
73 ret = psy->get_property(psy, off, &value);
Anton Vorontsov4a11b592007-05-04 00:27:45 +040074
75 if (ret < 0) {
Anton Vorontsov9d233e82009-12-03 00:24:51 +030076 if (ret == -ENODATA)
77 dev_dbg(dev, "driver has no data for `%s' property\n",
78 attr->attr.name);
79 else if (ret != -ENODEV)
Anton Vorontsov4a11b592007-05-04 00:27:45 +040080 dev_err(dev, "driver failed to report `%s' property\n",
81 attr->attr.name);
82 return ret;
83 }
84
85 if (off == POWER_SUPPLY_PROP_STATUS)
86 return sprintf(buf, "%s\n", status_text[value.intval]);
Andres Salomonee8076e2009-07-02 09:45:18 -040087 else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
88 return sprintf(buf, "%s\n", charge_type[value.intval]);
Anton Vorontsov4a11b592007-05-04 00:27:45 +040089 else if (off == POWER_SUPPLY_PROP_HEALTH)
90 return sprintf(buf, "%s\n", health_text[value.intval]);
91 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
92 return sprintf(buf, "%s\n", technology_text[value.intval]);
Andres Salomonb294a292009-06-30 02:13:01 -040093 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
94 return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
Anton Vorontsov5f487cd2010-05-18 21:49:51 +020095 else if (off == POWER_SUPPLY_PROP_TYPE)
96 return sprintf(buf, "%s\n", type_text[value.intval]);
Anton Vorontsov4a11b592007-05-04 00:27:45 +040097 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
98 return sprintf(buf, "%s\n", value.strval);
99
100 return sprintf(buf, "%d\n", value.intval);
101}
102
Daniel Mack0011d2d2010-05-18 21:49:52 +0200103static ssize_t power_supply_store_property(struct device *dev,
104 struct device_attribute *attr,
105 const char *buf, size_t count) {
106 ssize_t ret;
107 struct power_supply *psy = dev_get_drvdata(dev);
108 const ptrdiff_t off = attr - power_supply_attrs;
109 union power_supply_propval value;
110 long long_val;
111
112 /* TODO: support other types than int */
113 ret = strict_strtol(buf, 10, &long_val);
114 if (ret < 0)
115 return ret;
116
117 value.intval = long_val;
118
119 ret = psy->set_property(psy, off, &value);
120 if (ret < 0)
121 return ret;
122
123 return count;
124}
125
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400126/* Must be in the same order as POWER_SUPPLY_PROP_* */
127static struct device_attribute power_supply_attrs[] = {
128 /* Properties of type `int' */
129 POWER_SUPPLY_ATTR(status),
Andres Salomonee8076e2009-07-02 09:45:18 -0400130 POWER_SUPPLY_ATTR(charge_type),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400131 POWER_SUPPLY_ATTR(health),
132 POWER_SUPPLY_ATTR(present),
133 POWER_SUPPLY_ATTR(online),
134 POWER_SUPPLY_ATTR(technology),
Alexey Starikovskiyc955fe82009-10-15 14:31:30 +0400135 POWER_SUPPLY_ATTR(cycle_count),
Dmitry Baryshkovc7cc9302008-01-07 04:12:41 +0300136 POWER_SUPPLY_ATTR(voltage_max),
137 POWER_SUPPLY_ATTR(voltage_min),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400138 POWER_SUPPLY_ATTR(voltage_max_design),
139 POWER_SUPPLY_ATTR(voltage_min_design),
140 POWER_SUPPLY_ATTR(voltage_now),
141 POWER_SUPPLY_ATTR(voltage_avg),
Heikki Krogerusfe3f6d02010-10-04 10:51:38 +0300142 POWER_SUPPLY_ATTR(current_max),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400143 POWER_SUPPLY_ATTR(current_now),
144 POWER_SUPPLY_ATTR(current_avg),
Alexey Starikovskiy7faa1442009-03-27 22:23:52 -0400145 POWER_SUPPLY_ATTR(power_now),
146 POWER_SUPPLY_ATTR(power_avg),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400147 POWER_SUPPLY_ATTR(charge_full_design),
148 POWER_SUPPLY_ATTR(charge_empty_design),
149 POWER_SUPPLY_ATTR(charge_full),
150 POWER_SUPPLY_ATTR(charge_empty),
151 POWER_SUPPLY_ATTR(charge_now),
152 POWER_SUPPLY_ATTR(charge_avg),
Andres Salomon8e552c32008-05-12 21:46:29 -0400153 POWER_SUPPLY_ATTR(charge_counter),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400154 POWER_SUPPLY_ATTR(energy_full_design),
155 POWER_SUPPLY_ATTR(energy_empty_design),
156 POWER_SUPPLY_ATTR(energy_full),
157 POWER_SUPPLY_ATTR(energy_empty),
158 POWER_SUPPLY_ATTR(energy_now),
159 POWER_SUPPLY_ATTR(energy_avg),
160 POWER_SUPPLY_ATTR(capacity),
Andres Salomonb294a292009-06-30 02:13:01 -0400161 POWER_SUPPLY_ATTR(capacity_level),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400162 POWER_SUPPLY_ATTR(temp),
163 POWER_SUPPLY_ATTR(temp_ambient),
164 POWER_SUPPLY_ATTR(time_to_empty_now),
165 POWER_SUPPLY_ATTR(time_to_empty_avg),
166 POWER_SUPPLY_ATTR(time_to_full_now),
167 POWER_SUPPLY_ATTR(time_to_full_avg),
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200168 POWER_SUPPLY_ATTR(type),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400169 /* Properties of type `const char *' */
170 POWER_SUPPLY_ATTR(model_name),
171 POWER_SUPPLY_ATTR(manufacturer),
maximilian attems7c2670b2008-01-22 18:46:50 +0100172 POWER_SUPPLY_ATTR(serial_number),
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400173};
174
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200175static struct attribute *
176__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400177
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200178static mode_t power_supply_attr_is_visible(struct kobject *kobj,
179 struct attribute *attr,
180 int attrno)
181{
182 struct device *dev = container_of(kobj, struct device, kobj);
183 struct power_supply *psy = dev_get_drvdata(dev);
Daniel Mackbbabb152010-05-25 02:39:45 +0200184 mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200185 int i;
186
Daniel Mackbbabb152010-05-25 02:39:45 +0200187 if (attrno == POWER_SUPPLY_PROP_TYPE)
188 return mode;
189
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200190 for (i = 0; i < psy->num_properties; i++) {
Daniel Mack0011d2d2010-05-18 21:49:52 +0200191 int property = psy->properties[i];
192
193 if (property == attrno) {
Daniel Mack0011d2d2010-05-18 21:49:52 +0200194 if (psy->property_is_writeable &&
195 psy->property_is_writeable(psy, property) > 0)
196 mode |= S_IWUSR;
197
198 return mode;
199 }
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200200 }
201
202 return 0;
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400203}
204
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200205static struct attribute_group power_supply_attr_group = {
206 .attrs = __power_supply_attrs,
207 .is_visible = power_supply_attr_is_visible,
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400208};
209
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200210static const struct attribute_group *power_supply_attr_groups[] = {
211 &power_supply_attr_group,
212 NULL,
213};
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400214
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200215void power_supply_init_attrs(struct device_type *dev_type)
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400216{
217 int i;
218
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200219 dev_type->groups = power_supply_attr_groups;
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400220
Anton Vorontsov5f487cd2010-05-18 21:49:51 +0200221 for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
222 __power_supply_attrs[i] = &power_supply_attrs[i].attr;
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400223}
224
225static char *kstruprdup(const char *str, gfp_t gfp)
226{
227 char *ret, *ustr;
228
229 ustr = ret = kmalloc(strlen(str) + 1, gfp);
230
231 if (!ret)
232 return NULL;
233
234 while (*str)
235 *ustr++ = toupper(*str++);
236
237 *ustr = 0;
238
239 return ret;
240}
241
Kay Sievers7eff2e72007-08-14 15:15:12 +0200242int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400243{
244 struct power_supply *psy = dev_get_drvdata(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200245 int ret = 0, j;
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400246 char *prop_buf;
247 char *attrname;
248
249 dev_dbg(dev, "uevent\n");
250
Dmitry Baryshkov56fa18e2008-06-08 19:43:42 +0400251 if (!psy || !psy->dev) {
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400252 dev_dbg(dev, "No power supply yet\n");
253 return ret;
254 }
255
256 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
257
Kay Sievers7eff2e72007-08-14 15:15:12 +0200258 ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->name);
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400259 if (ret)
260 return ret;
261
262 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
263 if (!prop_buf)
264 return -ENOMEM;
265
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400266 for (j = 0; j < psy->num_properties; j++) {
267 struct device_attribute *attr;
268 char *line;
269
270 attr = &power_supply_attrs[psy->properties[j]];
271
272 ret = power_supply_show_property(dev, attr, prop_buf);
273 if (ret == -ENODEV) {
274 /* When a battery is absent, we expect -ENODEV. Don't abort;
275 send the uevent with at least the the PRESENT=0 property */
276 ret = 0;
277 continue;
278 }
279
280 if (ret < 0)
281 goto out;
282
283 line = strchr(prop_buf, '\n');
284 if (line)
285 *line = 0;
286
287 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
288 if (!attrname) {
289 ret = -ENOMEM;
290 goto out;
291 }
292
293 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
294
Kay Sievers7eff2e72007-08-14 15:15:12 +0200295 ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400296 kfree(attrname);
297 if (ret)
298 goto out;
299 }
Anton Vorontsov4a11b592007-05-04 00:27:45 +0400300
301out:
302 free_page((unsigned long)prop_buf);
303
304 return ret;
305}