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/kernel.h>
14#include <linux/device.h>
15#include <linux/power_supply.h>
16#include <linux/slab.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	unsigned long delay_on = 0;
26	unsigned long delay_off = 0;
27
28	if (psy->desc->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
29		return;
30
31	dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);
32
33	switch (status.intval) {
34	case POWER_SUPPLY_STATUS_FULL:
35		led_trigger_event(psy->charging_full_trig, LED_FULL);
36		led_trigger_event(psy->charging_trig, LED_OFF);
37		led_trigger_event(psy->full_trig, LED_FULL);
38		led_trigger_event(psy->charging_blink_full_solid_trig,
39			LED_FULL);
40		break;
41	case POWER_SUPPLY_STATUS_CHARGING:
42		led_trigger_event(psy->charging_full_trig, LED_FULL);
43		led_trigger_event(psy->charging_trig, LED_FULL);
44		led_trigger_event(psy->full_trig, LED_OFF);
45		led_trigger_blink(psy->charging_blink_full_solid_trig,
46			&delay_on, &delay_off);
47		break;
48	default:
49		led_trigger_event(psy->charging_full_trig, LED_OFF);
50		led_trigger_event(psy->charging_trig, LED_OFF);
51		led_trigger_event(psy->full_trig, LED_OFF);
52		led_trigger_event(psy->charging_blink_full_solid_trig,
53			LED_OFF);
54		break;
55	}
56}
57
58static int power_supply_create_bat_triggers(struct power_supply *psy)
59{
60	psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
61					"%s-charging-or-full", psy->desc->name);
62	if (!psy->charging_full_trig_name)
63		goto charging_full_failed;
64
65	psy->charging_trig_name = kasprintf(GFP_KERNEL,
66					"%s-charging", psy->desc->name);
67	if (!psy->charging_trig_name)
68		goto charging_failed;
69
70	psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->desc->name);
71	if (!psy->full_trig_name)
72		goto full_failed;
73
74	psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
75		"%s-charging-blink-full-solid", psy->desc->name);
76	if (!psy->charging_blink_full_solid_trig_name)
77		goto charging_blink_full_solid_failed;
78
79	led_trigger_register_simple(psy->charging_full_trig_name,
80				    &psy->charging_full_trig);
81	led_trigger_register_simple(psy->charging_trig_name,
82				    &psy->charging_trig);
83	led_trigger_register_simple(psy->full_trig_name,
84				    &psy->full_trig);
85	led_trigger_register_simple(psy->charging_blink_full_solid_trig_name,
86				    &psy->charging_blink_full_solid_trig);
87
88	return 0;
89
90charging_blink_full_solid_failed:
91	kfree(psy->full_trig_name);
92full_failed:
93	kfree(psy->charging_trig_name);
94charging_failed:
95	kfree(psy->charging_full_trig_name);
96charging_full_failed:
97	return -ENOMEM;
98}
99
100static void power_supply_remove_bat_triggers(struct power_supply *psy)
101{
102	led_trigger_unregister_simple(psy->charging_full_trig);
103	led_trigger_unregister_simple(psy->charging_trig);
104	led_trigger_unregister_simple(psy->full_trig);
105	led_trigger_unregister_simple(psy->charging_blink_full_solid_trig);
106	kfree(psy->charging_blink_full_solid_trig_name);
107	kfree(psy->full_trig_name);
108	kfree(psy->charging_trig_name);
109	kfree(psy->charging_full_trig_name);
110}
111
112/* Generated power specific LEDs triggers. */
113
114static void power_supply_update_gen_leds(struct power_supply *psy)
115{
116	union power_supply_propval online;
117
118	if (psy->desc->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
119		return;
120
121	dev_dbg(&psy->dev, "%s %d\n", __func__, online.intval);
122
123	if (online.intval)
124		led_trigger_event(psy->online_trig, LED_FULL);
125	else
126		led_trigger_event(psy->online_trig, LED_OFF);
127}
128
129static int power_supply_create_gen_triggers(struct power_supply *psy)
130{
131	psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online",
132					  psy->desc->name);
133	if (!psy->online_trig_name)
134		return -ENOMEM;
135
136	led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
137
138	return 0;
139}
140
141static void power_supply_remove_gen_triggers(struct power_supply *psy)
142{
143	led_trigger_unregister_simple(psy->online_trig);
144	kfree(psy->online_trig_name);
145}
146
147/* Choice what triggers to create&update. */
148
149void power_supply_update_leds(struct power_supply *psy)
150{
151	if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
152		power_supply_update_bat_leds(psy);
153	else
154		power_supply_update_gen_leds(psy);
155}
156
157int power_supply_create_triggers(struct power_supply *psy)
158{
159	if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
160		return power_supply_create_bat_triggers(psy);
161	return power_supply_create_gen_triggers(psy);
162}
163
164void power_supply_remove_triggers(struct power_supply *psy)
165{
166	if (psy->desc->type == POWER_SUPPLY_TYPE_BATTERY)
167		power_supply_remove_bat_triggers(psy);
168	else
169		power_supply_remove_gen_triggers(psy);
170}
171