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->desc->type;
78	} else {
79		ret = power_supply_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
92	if (off == POWER_SUPPLY_PROP_STATUS)
93		return sprintf(buf, "%s\n", status_text[value.intval]);
94	else if (off == POWER_SUPPLY_PROP_CHARGE_TYPE)
95		return sprintf(buf, "%s\n", charge_type[value.intval]);
96	else if (off == POWER_SUPPLY_PROP_HEALTH)
97		return sprintf(buf, "%s\n", health_text[value.intval]);
98	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
99		return sprintf(buf, "%s\n", technology_text[value.intval]);
100	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
101		return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
102	else if (off == POWER_SUPPLY_PROP_TYPE)
103		return sprintf(buf, "%s\n", type_text[value.intval]);
104	else if (off == POWER_SUPPLY_PROP_SCOPE)
105		return sprintf(buf, "%s\n", scope_text[value.intval]);
106	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
107		return sprintf(buf, "%s\n", value.strval);
108
109	return sprintf(buf, "%d\n", value.intval);
110}
111
112static ssize_t power_supply_store_property(struct device *dev,
113					   struct device_attribute *attr,
114					   const char *buf, size_t count) {
115	ssize_t ret;
116	struct power_supply *psy = dev_get_drvdata(dev);
117	const ptrdiff_t off = attr - power_supply_attrs;
118	union power_supply_propval value;
119	long long_val;
120
121	/* TODO: support other types than int */
122	ret = kstrtol(buf, 10, &long_val);
123	if (ret < 0)
124		return ret;
125
126	value.intval = long_val;
127
128	ret = psy->desc->set_property(psy, off, &value);
129	if (ret < 0)
130		return ret;
131
132	return count;
133}
134
135/* Must be in the same order as POWER_SUPPLY_PROP_* */
136static struct device_attribute power_supply_attrs[] = {
137	/* Properties of type `int' */
138	POWER_SUPPLY_ATTR(status),
139	POWER_SUPPLY_ATTR(charge_type),
140	POWER_SUPPLY_ATTR(health),
141	POWER_SUPPLY_ATTR(present),
142	POWER_SUPPLY_ATTR(online),
143	POWER_SUPPLY_ATTR(authentic),
144	POWER_SUPPLY_ATTR(technology),
145	POWER_SUPPLY_ATTR(cycle_count),
146	POWER_SUPPLY_ATTR(voltage_max),
147	POWER_SUPPLY_ATTR(voltage_min),
148	POWER_SUPPLY_ATTR(voltage_max_design),
149	POWER_SUPPLY_ATTR(voltage_min_design),
150	POWER_SUPPLY_ATTR(voltage_now),
151	POWER_SUPPLY_ATTR(voltage_avg),
152	POWER_SUPPLY_ATTR(voltage_ocv),
153	POWER_SUPPLY_ATTR(voltage_boot),
154	POWER_SUPPLY_ATTR(current_max),
155	POWER_SUPPLY_ATTR(current_now),
156	POWER_SUPPLY_ATTR(current_avg),
157	POWER_SUPPLY_ATTR(current_boot),
158	POWER_SUPPLY_ATTR(power_now),
159	POWER_SUPPLY_ATTR(power_avg),
160	POWER_SUPPLY_ATTR(charge_full_design),
161	POWER_SUPPLY_ATTR(charge_empty_design),
162	POWER_SUPPLY_ATTR(charge_full),
163	POWER_SUPPLY_ATTR(charge_empty),
164	POWER_SUPPLY_ATTR(charge_now),
165	POWER_SUPPLY_ATTR(charge_avg),
166	POWER_SUPPLY_ATTR(charge_counter),
167	POWER_SUPPLY_ATTR(constant_charge_current),
168	POWER_SUPPLY_ATTR(constant_charge_current_max),
169	POWER_SUPPLY_ATTR(constant_charge_voltage),
170	POWER_SUPPLY_ATTR(constant_charge_voltage_max),
171	POWER_SUPPLY_ATTR(charge_control_limit),
172	POWER_SUPPLY_ATTR(charge_control_limit_max),
173	POWER_SUPPLY_ATTR(input_current_limit),
174	POWER_SUPPLY_ATTR(energy_full_design),
175	POWER_SUPPLY_ATTR(energy_empty_design),
176	POWER_SUPPLY_ATTR(energy_full),
177	POWER_SUPPLY_ATTR(energy_empty),
178	POWER_SUPPLY_ATTR(energy_now),
179	POWER_SUPPLY_ATTR(energy_avg),
180	POWER_SUPPLY_ATTR(capacity),
181	POWER_SUPPLY_ATTR(capacity_alert_min),
182	POWER_SUPPLY_ATTR(capacity_alert_max),
183	POWER_SUPPLY_ATTR(capacity_level),
184	POWER_SUPPLY_ATTR(temp),
185	POWER_SUPPLY_ATTR(temp_max),
186	POWER_SUPPLY_ATTR(temp_min),
187	POWER_SUPPLY_ATTR(temp_alert_min),
188	POWER_SUPPLY_ATTR(temp_alert_max),
189	POWER_SUPPLY_ATTR(temp_ambient),
190	POWER_SUPPLY_ATTR(temp_ambient_alert_min),
191	POWER_SUPPLY_ATTR(temp_ambient_alert_max),
192	POWER_SUPPLY_ATTR(time_to_empty_now),
193	POWER_SUPPLY_ATTR(time_to_empty_avg),
194	POWER_SUPPLY_ATTR(time_to_full_now),
195	POWER_SUPPLY_ATTR(time_to_full_avg),
196	POWER_SUPPLY_ATTR(type),
197	POWER_SUPPLY_ATTR(scope),
198	POWER_SUPPLY_ATTR(charge_term_current),
199	POWER_SUPPLY_ATTR(calibrate),
200	/* Properties of type `const char *' */
201	POWER_SUPPLY_ATTR(model_name),
202	POWER_SUPPLY_ATTR(manufacturer),
203	POWER_SUPPLY_ATTR(serial_number),
204};
205
206static struct attribute *
207__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
208
209static umode_t power_supply_attr_is_visible(struct kobject *kobj,
210					   struct attribute *attr,
211					   int attrno)
212{
213	struct device *dev = container_of(kobj, struct device, kobj);
214	struct power_supply *psy = dev_get_drvdata(dev);
215	umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
216	int i;
217
218	if (attrno == POWER_SUPPLY_PROP_TYPE)
219		return mode;
220
221	for (i = 0; i < psy->desc->num_properties; i++) {
222		int property = psy->desc->properties[i];
223
224		if (property == attrno) {
225			if (psy->desc->property_is_writeable &&
226			    power_supply_property_is_writeable(psy, property) > 0)
227				mode |= S_IWUSR;
228
229			return mode;
230		}
231	}
232
233	return 0;
234}
235
236static struct attribute_group power_supply_attr_group = {
237	.attrs = __power_supply_attrs,
238	.is_visible = power_supply_attr_is_visible,
239};
240
241static const struct attribute_group *power_supply_attr_groups[] = {
242	&power_supply_attr_group,
243	NULL,
244};
245
246void power_supply_init_attrs(struct device_type *dev_type)
247{
248	int i;
249
250	dev_type->groups = power_supply_attr_groups;
251
252	for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
253		__power_supply_attrs[i] = &power_supply_attrs[i].attr;
254}
255
256static char *kstruprdup(const char *str, gfp_t gfp)
257{
258	char *ret, *ustr;
259
260	ustr = ret = kmalloc(strlen(str) + 1, gfp);
261
262	if (!ret)
263		return NULL;
264
265	while (*str)
266		*ustr++ = toupper(*str++);
267
268	*ustr = 0;
269
270	return ret;
271}
272
273int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env)
274{
275	struct power_supply *psy = dev_get_drvdata(dev);
276	int ret = 0, j;
277	char *prop_buf;
278	char *attrname;
279
280	dev_dbg(dev, "uevent\n");
281
282	if (!psy || !psy->desc) {
283		dev_dbg(dev, "No power supply yet\n");
284		return ret;
285	}
286
287	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name);
288
289	ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name);
290	if (ret)
291		return ret;
292
293	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
294	if (!prop_buf)
295		return -ENOMEM;
296
297	for (j = 0; j < psy->desc->num_properties; j++) {
298		struct device_attribute *attr;
299		char *line;
300
301		attr = &power_supply_attrs[psy->desc->properties[j]];
302
303		ret = power_supply_show_property(dev, attr, prop_buf);
304		if (ret == -ENODEV || ret == -ENODATA) {
305			/* When a battery is absent, we expect -ENODEV. Don't abort;
306			   send the uevent with at least the the PRESENT=0 property */
307			ret = 0;
308			continue;
309		}
310
311		if (ret < 0)
312			goto out;
313
314		line = strchr(prop_buf, '\n');
315		if (line)
316			*line = 0;
317
318		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
319		if (!attrname) {
320			ret = -ENOMEM;
321			goto out;
322		}
323
324		dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
325
326		ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf);
327		kfree(attrname);
328		if (ret)
329			goto out;
330	}
331
332out:
333	free_page((unsigned long)prop_buf);
334
335	return ret;
336}
337