Root/drivers/power/power_supply_sysfs.c

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

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