1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LEDs triggers for power supply class
4 *
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
12#include <linux/kernel.h>
13#include <linux/device.h>
14#include <linux/power_supply.h>
15#include <linux/slab.h>
16#include <linux/leds.h>
17
18#include "power_supply.h"
19
20/* Battery specific LEDs triggers. */
21
22static void power_supply_update_bat_leds(struct power_supply *psy)
23{
24 union power_supply_propval status;
25
26 if (power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_STATUS, val: &status))
27 return;
28
29 dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);
30
31 switch (status.intval) {
32 case POWER_SUPPLY_STATUS_FULL:
33 led_trigger_event(trigger: psy->charging_full_trig, event: LED_FULL);
34 led_trigger_event(trigger: psy->charging_trig, event: LED_OFF);
35 led_trigger_event(trigger: psy->full_trig, event: LED_FULL);
36 /* Going from blink to LED on requires a LED_OFF event to stop blink */
37 led_trigger_event(trigger: psy->charging_blink_full_solid_trig, event: LED_OFF);
38 led_trigger_event(trigger: psy->charging_blink_full_solid_trig, event: LED_FULL);
39 break;
40 case POWER_SUPPLY_STATUS_CHARGING:
41 led_trigger_event(trigger: psy->charging_full_trig, event: LED_FULL);
42 led_trigger_event(trigger: psy->charging_trig, event: LED_FULL);
43 led_trigger_event(trigger: psy->full_trig, event: LED_OFF);
44 led_trigger_blink(trigger: psy->charging_blink_full_solid_trig, delay_on: 0, delay_off: 0);
45 break;
46 default:
47 led_trigger_event(trigger: psy->charging_full_trig, event: LED_OFF);
48 led_trigger_event(trigger: psy->charging_trig, event: LED_OFF);
49 led_trigger_event(trigger: psy->full_trig, event: LED_OFF);
50 led_trigger_event(trigger: psy->charging_blink_full_solid_trig,
51 event: LED_OFF);
52 break;
53 }
54}
55
56static int power_supply_create_bat_triggers(struct power_supply *psy)
57{
58 psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
59 fmt: "%s-charging-or-full", psy->desc->name);
60 if (!psy->charging_full_trig_name)
61 goto charging_full_failed;
62
63 psy->charging_trig_name = kasprintf(GFP_KERNEL,
64 fmt: "%s-charging", psy->desc->name);
65 if (!psy->charging_trig_name)
66 goto charging_failed;
67
68 psy->full_trig_name = kasprintf(GFP_KERNEL, fmt: "%s-full", psy->desc->name);
69 if (!psy->full_trig_name)
70 goto full_failed;
71
72 psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
73 fmt: "%s-charging-blink-full-solid", psy->desc->name);
74 if (!psy->charging_blink_full_solid_trig_name)
75 goto charging_blink_full_solid_failed;
76
77 led_trigger_register_simple(name: psy->charging_full_trig_name,
78 trigger: &psy->charging_full_trig);
79 led_trigger_register_simple(name: psy->charging_trig_name,
80 trigger: &psy->charging_trig);
81 led_trigger_register_simple(name: psy->full_trig_name,
82 trigger: &psy->full_trig);
83 led_trigger_register_simple(name: psy->charging_blink_full_solid_trig_name,
84 trigger: &psy->charging_blink_full_solid_trig);
85
86 return 0;
87
88charging_blink_full_solid_failed:
89 kfree(objp: psy->full_trig_name);
90full_failed:
91 kfree(objp: psy->charging_trig_name);
92charging_failed:
93 kfree(objp: psy->charging_full_trig_name);
94charging_full_failed:
95 return -ENOMEM;
96}
97
98static void power_supply_remove_bat_triggers(struct power_supply *psy)
99{
100 led_trigger_unregister_simple(trigger: psy->charging_full_trig);
101 led_trigger_unregister_simple(trigger: psy->charging_trig);
102 led_trigger_unregister_simple(trigger: psy->full_trig);
103 led_trigger_unregister_simple(trigger: psy->charging_blink_full_solid_trig);
104 kfree(objp: psy->charging_blink_full_solid_trig_name);
105 kfree(objp: psy->full_trig_name);
106 kfree(objp: psy->charging_trig_name);
107 kfree(objp: psy->charging_full_trig_name);
108}
109
110/* Generated power specific LEDs triggers. */
111
112static void power_supply_update_gen_leds(struct power_supply *psy)
113{
114 union power_supply_propval online;
115
116 if (power_supply_get_property(psy, psp: POWER_SUPPLY_PROP_ONLINE, val: &online))
117 return;
118
119 dev_dbg(&psy->dev, "%s %d\n", __func__, online.intval);
120
121 if (online.intval)
122 led_trigger_event(trigger: psy->online_trig, event: LED_FULL);
123 else
124 led_trigger_event(trigger: psy->online_trig, event: LED_OFF);
125}
126
127static int power_supply_create_gen_triggers(struct power_supply *psy)
128{
129 psy->online_trig_name = kasprintf(GFP_KERNEL, fmt: "%s-online",
130 psy->desc->name);
131 if (!psy->online_trig_name)
132 return -ENOMEM;
133
134 led_trigger_register_simple(name: psy->online_trig_name, trigger: &psy->online_trig);
135
136 return 0;
137}
138
139static void power_supply_remove_gen_triggers(struct power_supply *psy)
140{
141 led_trigger_unregister_simple(trigger: psy->online_trig);
142 kfree(objp: psy->online_trig_name);
143}
144
145/* Choice what triggers to create&update. */
146
147void power_supply_update_leds(struct power_supply *psy)
148{
149 if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
150 power_supply_update_bat_leds(psy);
151 else
152 power_supply_update_gen_leds(psy);
153}
154
155int power_supply_create_triggers(struct power_supply *psy)
156{
157 if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
158 return power_supply_create_bat_triggers(psy);
159 return power_supply_create_gen_triggers(psy);
160}
161
162void power_supply_remove_triggers(struct power_supply *psy)
163{
164 if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
165 power_supply_remove_bat_triggers(psy);
166 else
167 power_supply_remove_gen_triggers(psy);
168}
169

source code of linux/drivers/power/supply/power_supply_leds.c