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authorAnton Vorontsov <cbou@mail.ru>2007-05-03 16:27:45 -0400
committerDavid Woodhouse <dwmw2@infradead.org>2007-07-10 06:25:44 -0400
commit4a11b59d8283662193a9c6a9c14c58d1b9bf0617 (patch)
tree492bf022c806ec6c554ca5f8e7c05ea6db138137 /drivers/power
parent7dcca30a32aadb0520417521b0c44f42d09fe05c (diff)
[BATTERY] Universal power supply class (was: battery class)
This class is result of "external power" and "battery" classes merge, as suggested by David Woodhouse. He also implemented uevent support. Here how userspace seeing it now: # ls /sys/class/power\ supply/ ac main-battery usb # cat /sys/class/power\ supply/ac/type AC # cat /sys/class/power\ supply/usb/type USB # cat /sys/class/power\ supply/main-battery/type Battery # cat /sys/class/power\ supply/ac/online 1 # cat /sys/class/power\ supply/usb/online 0 # cat /sys/class/power\ supply/main-battery/status Charging # cat /sys/class/leds/h5400\:red-left/trigger none h5400-radio timer hwtimer ac-online usb-online main-battery-charging-or-full [main-battery-charging] main-battery-full Signed-off-by: Anton Vorontsov <cbou@mail.ru> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/Kconfig17
-rw-r--r--drivers/power/Makefile15
-rw-r--r--drivers/power/power_supply.h42
-rw-r--r--drivers/power/power_supply_core.c168
-rw-r--r--drivers/power/power_supply_leds.c176
-rw-r--r--drivers/power/power_supply_sysfs.c299
6 files changed, 717 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
new file mode 100644
index 000000000000..7811fa627412
--- /dev/null
+++ b/drivers/power/Kconfig
@@ -0,0 +1,17 @@
1menuconfig POWER_SUPPLY
2 tristate "Power supply class support"
3 help
4 Say Y here to enable power supply class support. This allows
5 power supply (batteries, AC, USB) monitoring by userspace
6 via sysfs and uevent (if available) and/or APM kernel interface
7 (if selected below).
8
9if POWER_SUPPLY
10
11config POWER_SUPPLY_DEBUG
12 bool "Power supply debug"
13 help
14 Say Y here to enable debugging messages for power supply class
15 and drivers.
16
17endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
new file mode 100644
index 000000000000..3c88148983a2
--- /dev/null
+++ b/drivers/power/Makefile
@@ -0,0 +1,15 @@
1power_supply-objs := power_supply_core.o
2
3ifeq ($(CONFIG_SYSFS),y)
4power_supply-objs += power_supply_sysfs.o
5endif
6
7ifeq ($(CONFIG_LEDS_TRIGGERS),y)
8power_supply-objs += power_supply_leds.o
9endif
10
11ifeq ($(CONFIG_POWER_SUPPLY_DEBUG),y)
12EXTRA_CFLAGS += -DDEBUG
13endif
14
15obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
diff --git a/drivers/power/power_supply.h b/drivers/power/power_supply.h
new file mode 100644
index 000000000000..a9880d468ee4
--- /dev/null
+++ b/drivers/power/power_supply.h
@@ -0,0 +1,42 @@
1/*
2 * Functions private to power supply class
3 *
4 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
5 * Copyright © 2004 Szabolcs Gyurko
6 * Copyright © 2003 Ian Molton <spyro@f2s.com>
7 *
8 * Modified: 2004, Oct Szabolcs Gyurko
9 *
10 * You may use this code as per GPL version 2
11 */
12
13#ifdef CONFIG_SYSFS
14
15extern int power_supply_create_attrs(struct power_supply *psy);
16extern void power_supply_remove_attrs(struct power_supply *psy);
17extern int power_supply_uevent(struct device *dev, char **envp, int num_envp,
18 char *buffer, int buffer_size);
19
20#else
21
22static inline int power_supply_create_attrs(struct power_supply *psy)
23{ return 0; }
24static inline void power_supply_remove_attrs(struct power_supply *psy) {}
25#define power_supply_uevent NULL
26
27#endif /* CONFIG_SYSFS */
28
29#ifdef CONFIG_LEDS_TRIGGERS
30
31extern void power_supply_update_leds(struct power_supply *psy);
32extern int power_supply_create_triggers(struct power_supply *psy);
33extern void power_supply_remove_triggers(struct power_supply *psy);
34
35#else
36
37static inline void power_supply_update_leds(struct power_supply *psy) {}
38static inline int power_supply_create_triggers(struct power_supply *psy)
39{ return 0; }
40static inline void power_supply_remove_triggers(struct power_supply *psy) {}
41
42#endif /* CONFIG_LEDS_TRIGGERS */
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
new file mode 100644
index 000000000000..e87ea5156755
--- /dev/null
+++ b/drivers/power/power_supply_core.c
@@ -0,0 +1,168 @@
1/*
2 * Universal power supply monitor class
3 *
4 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
5 * Copyright © 2004 Szabolcs Gyurko
6 * Copyright © 2003 Ian Molton <spyro@f2s.com>
7 *
8 * Modified: 2004, Oct Szabolcs Gyurko
9 *
10 * You may use this code as per GPL version 2
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/err.h>
18#include <linux/power_supply.h>
19#include "power_supply.h"
20
21struct class *power_supply_class;
22
23static void power_supply_changed_work(struct work_struct *work)
24{
25 struct power_supply *psy = container_of(work, struct power_supply,
26 changed_work);
27 int i;
28
29 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
30
31 for (i = 0; i < psy->num_supplicants; i++) {
32 struct device *dev;
33
34 down(&power_supply_class->sem);
35 list_for_each_entry(dev, &power_supply_class->devices, node) {
36 struct power_supply *pst = dev_get_drvdata(dev);
37
38 if (!strcmp(psy->supplied_to[i], pst->name)) {
39 if (pst->external_power_changed)
40 pst->external_power_changed(pst);
41 }
42 }
43 up(&power_supply_class->sem);
44 }
45
46 power_supply_update_leds(psy);
47
48 kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
49
50 return;
51}
52
53void power_supply_changed(struct power_supply *psy)
54{
55 dev_dbg(psy->dev, "%s\n", __FUNCTION__);
56
57 schedule_work(&psy->changed_work);
58
59 return;
60}
61
62int power_supply_am_i_supplied(struct power_supply *psy)
63{
64 union power_supply_propval ret = {0,};
65 struct device *dev;
66
67 down(&power_supply_class->sem);
68 list_for_each_entry(dev, &power_supply_class->devices, node) {
69 struct power_supply *epsy = dev_get_drvdata(dev);
70 int i;
71
72 for (i = 0; i < epsy->num_supplicants; i++) {
73 if (!strcmp(epsy->supplied_to[i], psy->name)) {
74 if (epsy->get_property(epsy,
75 POWER_SUPPLY_PROP_ONLINE, &ret))
76 continue;
77 if (ret.intval)
78 goto out;
79 }
80 }
81 }
82out:
83 up(&power_supply_class->sem);
84
85 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
86
87 return ret.intval;
88}
89
90int power_supply_register(struct device *parent, struct power_supply *psy)
91{
92 int rc = 0;
93
94 psy->dev = device_create(power_supply_class, parent, 0,
95 "%s", psy->name);
96 if (IS_ERR(psy->dev)) {
97 rc = PTR_ERR(psy->dev);
98 goto dev_create_failed;
99 }
100
101 dev_set_drvdata(psy->dev, psy);
102
103 INIT_WORK(&psy->changed_work, power_supply_changed_work);
104
105 rc = power_supply_create_attrs(psy);
106 if (rc)
107 goto create_attrs_failed;
108
109 rc = power_supply_create_triggers(psy);
110 if (rc)
111 goto create_triggers_failed;
112
113 power_supply_changed(psy);
114
115 goto success;
116
117create_triggers_failed:
118 power_supply_remove_attrs(psy);
119create_attrs_failed:
120 device_unregister(psy->dev);
121dev_create_failed:
122success:
123 return rc;
124}
125
126void power_supply_unregister(struct power_supply *psy)
127{
128 flush_scheduled_work();
129 power_supply_remove_triggers(psy);
130 power_supply_remove_attrs(psy);
131 device_unregister(psy->dev);
132 return;
133}
134
135static int __init power_supply_class_init(void)
136{
137 power_supply_class = class_create(THIS_MODULE, "power_supply");
138
139 if (IS_ERR(power_supply_class))
140 return PTR_ERR(power_supply_class);
141
142 power_supply_class->dev_uevent = power_supply_uevent;
143
144 return 0;
145}
146
147static void __exit power_supply_class_exit(void)
148{
149 class_destroy(power_supply_class);
150 return;
151}
152
153EXPORT_SYMBOL_GPL(power_supply_changed);
154EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
155EXPORT_SYMBOL_GPL(power_supply_register);
156EXPORT_SYMBOL_GPL(power_supply_unregister);
157
158/* exported for the APM Power driver, APM emulation */
159EXPORT_SYMBOL_GPL(power_supply_class);
160
161subsys_initcall(power_supply_class_init);
162module_exit(power_supply_class_exit);
163
164MODULE_DESCRIPTION("Universal power supply monitor class");
165MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
166 "Szabolcs Gyurko, "
167 "Anton Vorontsov <cbou@mail.ru>");
168MODULE_LICENSE("GPL");
diff --git a/drivers/power/power_supply_leds.c b/drivers/power/power_supply_leds.c
new file mode 100644
index 000000000000..7232490bb595
--- /dev/null
+++ b/drivers/power/power_supply_leds.c
@@ -0,0 +1,176 @@
1/*
2 * LEDs triggers for power supply class
3 *
4 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
5 * Copyright © 2004 Szabolcs Gyurko
6 * Copyright © 2003 Ian Molton <spyro@f2s.com>
7 *
8 * Modified: 2004, Oct Szabolcs Gyurko
9 *
10 * You may use this code as per GPL version 2
11 */
12
13#include <linux/power_supply.h>
14
15/* Battery specific LEDs triggers. */
16
17static void power_supply_update_bat_leds(struct power_supply *psy)
18{
19 union power_supply_propval status;
20
21 if (psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
22 return;
23
24 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, status.intval);
25
26 switch (status.intval) {
27 case POWER_SUPPLY_STATUS_FULL:
28 led_trigger_event(psy->charging_full_trig, LED_FULL);
29 led_trigger_event(psy->charging_trig, LED_OFF);
30 led_trigger_event(psy->full_trig, LED_FULL);
31 break;
32 case POWER_SUPPLY_STATUS_CHARGING:
33 led_trigger_event(psy->charging_full_trig, LED_FULL);
34 led_trigger_event(psy->charging_trig, LED_FULL);
35 led_trigger_event(psy->full_trig, LED_OFF);
36 break;
37 default:
38 led_trigger_event(psy->charging_full_trig, LED_OFF);
39 led_trigger_event(psy->charging_trig, LED_OFF);
40 led_trigger_event(psy->full_trig, LED_OFF);
41 break;
42 }
43
44 return;
45}
46
47static int power_supply_create_bat_triggers(struct power_supply *psy)
48{
49 int rc = 0;
50
51 psy->charging_full_trig_name = kmalloc(strlen(psy->name) +
52 sizeof("-charging-or-full"), GFP_KERNEL);
53 if (!psy->charging_full_trig_name)
54 goto charging_full_failed;
55
56 psy->charging_trig_name = kmalloc(strlen(psy->name) +
57 sizeof("-charging"), GFP_KERNEL);
58 if (!psy->charging_trig_name)
59 goto charging_failed;
60
61 psy->full_trig_name = kmalloc(strlen(psy->name) +
62 sizeof("-full"), GFP_KERNEL);
63 if (!psy->full_trig_name)
64 goto full_failed;
65
66 strcpy(psy->charging_full_trig_name, psy->name);
67 strcat(psy->charging_full_trig_name, "-charging-or-full");
68 strcpy(psy->charging_trig_name, psy->name);
69 strcat(psy->charging_trig_name, "-charging");
70 strcpy(psy->full_trig_name, psy->name);
71 strcat(psy->full_trig_name, "-full");
72
73 led_trigger_register_simple(psy->charging_full_trig_name,
74 &psy->charging_full_trig);
75 led_trigger_register_simple(psy->charging_trig_name,
76 &psy->charging_trig);
77 led_trigger_register_simple(psy->full_trig_name,
78 &psy->full_trig);
79
80 goto success;
81
82full_failed:
83 kfree(psy->charging_trig_name);
84charging_failed:
85 kfree(psy->charging_full_trig_name);
86charging_full_failed:
87 rc = -ENOMEM;
88success:
89 return rc;
90}
91
92static void power_supply_remove_bat_triggers(struct power_supply *psy)
93{
94 led_trigger_unregister_simple(psy->charging_full_trig);
95 led_trigger_unregister_simple(psy->charging_trig);
96 led_trigger_unregister_simple(psy->full_trig);
97 kfree(psy->full_trig_name);
98 kfree(psy->charging_trig_name);
99 kfree(psy->charging_full_trig_name);
100 return;
101}
102
103/* Generated power specific LEDs triggers. */
104
105static void power_supply_update_gen_leds(struct power_supply *psy)
106{
107 union power_supply_propval online;
108
109 if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
110 return;
111
112 dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, online.intval);
113
114 if (online.intval)
115 led_trigger_event(psy->online_trig, LED_FULL);
116 else
117 led_trigger_event(psy->online_trig, LED_OFF);
118
119 return;
120}
121
122static int power_supply_create_gen_triggers(struct power_supply *psy)
123{
124 int rc = 0;
125
126 psy->online_trig_name = kmalloc(strlen(psy->name) + sizeof("-online"),
127 GFP_KERNEL);
128 if (!psy->online_trig_name)
129 goto online_failed;
130
131 strcpy(psy->online_trig_name, psy->name);
132 strcat(psy->online_trig_name, "-online");
133
134 led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
135
136 goto success;
137
138online_failed:
139 rc = -ENOMEM;
140success:
141 return rc;
142}
143
144static void power_supply_remove_gen_triggers(struct power_supply *psy)
145{
146 led_trigger_unregister_simple(psy->online_trig);
147 kfree(psy->online_trig_name);
148 return;
149}
150
151/* Choice what triggers to create&update. */
152
153void power_supply_update_leds(struct power_supply *psy)
154{
155 if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
156 power_supply_update_bat_leds(psy);
157 else
158 power_supply_update_gen_leds(psy);
159 return;
160}
161
162int power_supply_create_triggers(struct power_supply *psy)
163{
164 if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
165 return power_supply_create_bat_triggers(psy);
166 return power_supply_create_gen_triggers(psy);
167}
168
169void power_supply_remove_triggers(struct power_supply *psy)
170{
171 if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
172 power_supply_remove_bat_triggers(psy);
173 else
174 power_supply_remove_gen_triggers(psy);
175 return;
176}
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
new file mode 100644
index 000000000000..c07d4258d347
--- /dev/null
+++ b/drivers/power/power_supply_sysfs.c
@@ -0,0 +1,299 @@
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/power_supply.h>
16
17/*
18 * This is because the name "current" breaks the device attr macro.
19 * The "current" word resolves to "(get_current())" so instead of
20 * "current" "(get_current())" appears in the sysfs.
21 *
22 * The source of this definition is the device.h which calls __ATTR
23 * macro in sysfs.h which calls the __stringify macro.
24 *
25 * Only modification that the name is not tried to be resolved
26 * (as a macro let's say).
27 */
28
29#define POWER_SUPPLY_ATTR(_name) \
30{ \
31 .attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
32 .show = power_supply_show_property, \
33 .store = NULL, \
34}
35
36static struct device_attribute power_supply_attrs[];
37
38static ssize_t power_supply_show_property(struct device *dev,
39 struct device_attribute *attr,
40 char *buf) {
41 static char *status_text[] = {
42 "Unknown", "Charging", "Discharging", "Not charging", "Full"
43 };
44 static char *health_text[] = {
45 "Unknown", "Good", "Overheat", "Dead", "Over voltage",
46 "Unspecified failure"
47 };
48 static char *technology_text[] = {
49 "Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
50 };
51 static char *capacity_level_text[] = {
52 "Unknown", "Critical", "Low", "Normal", "High", "Full"
53 };
54 ssize_t ret;
55 struct power_supply *psy = dev_get_drvdata(dev);
56 const ptrdiff_t off = attr - power_supply_attrs;
57 union power_supply_propval value;
58
59 ret = psy->get_property(psy, off, &value);
60
61 if (ret < 0) {
62 if (ret != -ENODEV)
63 dev_err(dev, "driver failed to report `%s' property\n",
64 attr->attr.name);
65 return ret;
66 }
67
68 if (off == POWER_SUPPLY_PROP_STATUS)
69 return sprintf(buf, "%s\n", status_text[value.intval]);
70 else if (off == POWER_SUPPLY_PROP_HEALTH)
71 return sprintf(buf, "%s\n", health_text[value.intval]);
72 else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
73 return sprintf(buf, "%s\n", technology_text[value.intval]);
74 else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
75 return sprintf(buf, "%s\n",
76 capacity_level_text[value.intval]);
77 else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
78 return sprintf(buf, "%s\n", value.strval);
79
80 return sprintf(buf, "%d\n", value.intval);
81}
82
83/* Must be in the same order as POWER_SUPPLY_PROP_* */
84static struct device_attribute power_supply_attrs[] = {
85 /* Properties of type `int' */
86 POWER_SUPPLY_ATTR(status),
87 POWER_SUPPLY_ATTR(health),
88 POWER_SUPPLY_ATTR(present),
89 POWER_SUPPLY_ATTR(online),
90 POWER_SUPPLY_ATTR(technology),
91 POWER_SUPPLY_ATTR(voltage_max_design),
92 POWER_SUPPLY_ATTR(voltage_min_design),
93 POWER_SUPPLY_ATTR(voltage_now),
94 POWER_SUPPLY_ATTR(voltage_avg),
95 POWER_SUPPLY_ATTR(current_now),
96 POWER_SUPPLY_ATTR(current_avg),
97 POWER_SUPPLY_ATTR(charge_full_design),
98 POWER_SUPPLY_ATTR(charge_empty_design),
99 POWER_SUPPLY_ATTR(charge_full),
100 POWER_SUPPLY_ATTR(charge_empty),
101 POWER_SUPPLY_ATTR(charge_now),
102 POWER_SUPPLY_ATTR(charge_avg),
103 POWER_SUPPLY_ATTR(energy_full_design),
104 POWER_SUPPLY_ATTR(energy_empty_design),
105 POWER_SUPPLY_ATTR(energy_full),
106 POWER_SUPPLY_ATTR(energy_empty),
107 POWER_SUPPLY_ATTR(energy_now),
108 POWER_SUPPLY_ATTR(energy_avg),
109 POWER_SUPPLY_ATTR(capacity),
110 POWER_SUPPLY_ATTR(capacity_level),
111 POWER_SUPPLY_ATTR(temp),
112 POWER_SUPPLY_ATTR(temp_ambient),
113 POWER_SUPPLY_ATTR(time_to_empty_now),
114 POWER_SUPPLY_ATTR(time_to_empty_avg),
115 POWER_SUPPLY_ATTR(time_to_full_now),
116 POWER_SUPPLY_ATTR(time_to_full_avg),
117 /* Properties of type `const char *' */
118 POWER_SUPPLY_ATTR(model_name),
119 POWER_SUPPLY_ATTR(manufacturer),
120};
121
122static ssize_t power_supply_show_static_attrs(struct device *dev,
123 struct device_attribute *attr,
124 char *buf) {
125 static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
126 struct power_supply *psy = dev_get_drvdata(dev);
127
128 return sprintf(buf, "%s\n", type_text[psy->type]);
129}
130
131static struct device_attribute power_supply_static_attrs[] = {
132 __ATTR(type, 0444, power_supply_show_static_attrs, NULL),
133};
134
135int power_supply_create_attrs(struct power_supply *psy)
136{
137 int rc = 0;
138 int i, j;
139
140 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
141 rc = device_create_file(psy->dev,
142 &power_supply_static_attrs[i]);
143 if (rc)
144 goto statics_failed;
145 }
146
147 for (j = 0; j < psy->num_properties; j++) {
148 rc = device_create_file(psy->dev,
149 &power_supply_attrs[psy->properties[j]]);
150 if (rc)
151 goto dynamics_failed;
152 }
153
154 goto succeed;
155
156dynamics_failed:
157 while (j--)
158 device_remove_file(psy->dev,
159 &power_supply_attrs[psy->properties[j]]);
160statics_failed:
161 while (i--)
162 device_remove_file(psy->dev,
163 &power_supply_static_attrs[psy->properties[i]]);
164succeed:
165 return rc;
166}
167
168void power_supply_remove_attrs(struct power_supply *psy)
169{
170 int i;
171
172 for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
173 device_remove_file(psy->dev,
174 &power_supply_static_attrs[i]);
175
176 for (i = 0; i < psy->num_properties; i++)
177 device_remove_file(psy->dev,
178 &power_supply_attrs[psy->properties[i]]);
179
180 return;
181}
182
183static char *kstruprdup(const char *str, gfp_t gfp)
184{
185 char *ret, *ustr;
186
187 ustr = ret = kmalloc(strlen(str) + 1, gfp);
188
189 if (!ret)
190 return NULL;
191
192 while (*str)
193 *ustr++ = toupper(*str++);
194
195 *ustr = 0;
196
197 return ret;
198}
199
200int power_supply_uevent(struct device *dev, char **envp, int num_envp,
201 char *buffer, int buffer_size)
202{
203 struct power_supply *psy = dev_get_drvdata(dev);
204 int i = 0, length = 0, ret = 0, j;
205 char *prop_buf;
206 char *attrname;
207
208 dev_dbg(dev, "uevent\n");
209
210 if (!psy) {
211 dev_dbg(dev, "No power supply yet\n");
212 return ret;
213 }
214
215 dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
216
217 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
218 &length, "POWER_SUPPLY_NAME=%s", psy->name);
219 if (ret)
220 return ret;
221
222 prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
223 if (!prop_buf)
224 return -ENOMEM;
225
226 for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
227 struct device_attribute *attr;
228 char *line;
229
230 attr = &power_supply_static_attrs[j];
231
232 ret = power_supply_show_static_attrs(dev, attr, prop_buf);
233 if (ret < 0)
234 goto out;
235
236 line = strchr(prop_buf, '\n');
237 if (line)
238 *line = 0;
239
240 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
241 if (!attrname) {
242 ret = -ENOMEM;
243 goto out;
244 }
245
246 dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
247
248 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
249 &length, "POWER_SUPPLY_%s=%s",
250 attrname, prop_buf);
251 kfree(attrname);
252 if (ret)
253 goto out;
254 }
255
256 dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
257
258 for (j = 0; j < psy->num_properties; j++) {
259 struct device_attribute *attr;
260 char *line;
261
262 attr = &power_supply_attrs[psy->properties[j]];
263
264 ret = power_supply_show_property(dev, attr, prop_buf);
265 if (ret == -ENODEV) {
266 /* When a battery is absent, we expect -ENODEV. Don't abort;
267 send the uevent with at least the the PRESENT=0 property */
268 ret = 0;
269 continue;
270 }
271
272 if (ret < 0)
273 goto out;
274
275 line = strchr(prop_buf, '\n');
276 if (line)
277 *line = 0;
278
279 attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
280 if (!attrname) {
281 ret = -ENOMEM;
282 goto out;
283 }
284
285 dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
286
287 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
288 &length, "POWER_SUPPLY_%s=%s",
289 attrname, prop_buf);
290 kfree(attrname);
291 if (ret)
292 goto out;
293 }
294
295out:
296 free_page((unsigned long)prop_buf);
297
298 return ret;
299}
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 13:38:59 -0400