drivers/power/supply/power_supply_leds.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/power_supply_leds.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/power_supply_leds.c
Extension
.c
Size
6056 bytes
Lines
218
Domain
Driver Families
Bucket
drivers/power
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct power_supply_led_trigger {
	struct led_trigger trig;
	struct power_supply *psy;
};

#define trigger_to_psy_trigger(trigger) \
	container_of(trigger, struct power_supply_led_trigger, trig)

static int power_supply_led_trigger_activate(struct led_classdev *led_cdev)
{
	struct power_supply_led_trigger *psy_trig =
		trigger_to_psy_trigger(led_cdev->trigger);

	/* Sync current power-supply state to LED being activated */
	power_supply_update_leds(psy_trig->psy);
	return 0;
}

static int power_supply_register_led_trigger(struct power_supply *psy,
					     const char *name_template,
					     struct led_trigger **tp, int *err)
{
	struct power_supply_led_trigger *psy_trig;
	int ret = -ENOMEM;

	/* Bail on previous errors */
	if (err && *err)
		return *err;

	psy_trig = kzalloc_obj(*psy_trig);
	if (!psy_trig)
		goto err_free_trigger;

	psy_trig->trig.name = kasprintf(GFP_KERNEL, name_template, psy->desc->name);
	if (!psy_trig->trig.name)
		goto err_free_trigger;

	psy_trig->trig.activate = power_supply_led_trigger_activate;
	psy_trig->psy = psy;

	ret = led_trigger_register(&psy_trig->trig);
	if (ret)
		goto err_free_name;

	*tp = &psy_trig->trig;
	return 0;

err_free_name:
	kfree(psy_trig->trig.name);
err_free_trigger:
	kfree(psy_trig);
	if (err)
		*err = ret;

	return ret;
}

static void power_supply_unregister_led_trigger(struct led_trigger *trig)
{
	struct power_supply_led_trigger *psy_trig;

	if (!trig)
		return;

	psy_trig = trigger_to_psy_trigger(trig);
	led_trigger_unregister(&psy_trig->trig);
	kfree(psy_trig->trig.name);
	kfree(psy_trig);
}

static void power_supply_update_bat_leds(struct power_supply *psy)
{
	union power_supply_propval status;
	unsigned int intensity_green[3] = { 0, 255, 0 };
	unsigned int intensity_orange[3] = { 255, 128, 0 };

	if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
		return;

	dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);

	switch (status.intval) {
	case POWER_SUPPLY_STATUS_FULL:
		led_trigger_event(psy->trig, LED_FULL);
		led_trigger_event(psy->charging_trig, LED_OFF);
		led_trigger_event(psy->full_trig, LED_FULL);
		/* Going from blink to LED on requires a LED_OFF event to stop blink */
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_FULL);
		led_mc_trigger_event(psy->charging_orange_full_green_trig,

Annotation

Implementation Notes