drivers/net/wireless/ath/carl9170/led.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ath/carl9170/led.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/carl9170/led.c
Extension
.c
Size
4997 bytes
Lines
191
Domain
Driver Families
Bucket
drivers/net
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

if (ar->leds[i].registered) {
			if (ar->leds[i].last_state ||
			    ar->leds[i].toggled) {

				if (ar->leds[i].toggled)
					tmp = 70 + 200 / (ar->leds[i].toggled);

				if (tmp < blink_delay)
					blink_delay = tmp;

				led_val |= 1 << i;
				ar->leds[i].toggled = 0;
				rerun = true;
			}
		}
	}

	carl9170_led_set_state(ar, led_val);
	mutex_unlock(&ar->mutex);

	if (!rerun)
		return;

	ieee80211_queue_delayed_work(ar->hw,
				     &ar->led_work,
				     msecs_to_jiffies(blink_delay));
}

static void carl9170_led_set_brightness(struct led_classdev *led,
					enum led_brightness brightness)
{
	struct carl9170_led *arl = container_of(led, struct carl9170_led, l);
	struct ar9170 *ar = arl->ar;

	if (!arl->registered)
		return;

	if (arl->last_state != !!brightness) {
		arl->toggled++;
		arl->last_state = !!brightness;
	}

	if (likely(IS_ACCEPTING_CMD(ar) && arl->toggled))
		ieee80211_queue_delayed_work(ar->hw, &ar->led_work, HZ / 10);
}

static int carl9170_led_register_led(struct ar9170 *ar, int i, char *name,
				     const char *trigger)
{
	int err;

	snprintf(ar->leds[i].name, sizeof(ar->leds[i].name),
		 "carl9170-%s::%s", wiphy_name(ar->hw->wiphy), name);

	ar->leds[i].ar = ar;
	ar->leds[i].l.name = ar->leds[i].name;
	ar->leds[i].l.brightness_set = carl9170_led_set_brightness;
	ar->leds[i].l.brightness = 0;
	ar->leds[i].l.default_trigger = trigger;

	err = led_classdev_register(wiphy_dev(ar->hw->wiphy),
				    &ar->leds[i].l);
	if (err) {
		wiphy_err(ar->hw->wiphy, "failed to register %s LED (%d).\n",
			ar->leds[i].name, err);
	} else {
		ar->leds[i].registered = true;
	}

	return err;
}

void carl9170_led_unregister(struct ar9170 *ar)
{
	int i;

	for (i = 0; i < AR9170_NUM_LEDS; i++)
		if (ar->leds[i].registered) {
			led_classdev_unregister(&ar->leds[i].l);
			ar->leds[i].registered = false;
			ar->leds[i].toggled = 0;
		}

	cancel_delayed_work_sync(&ar->led_work);
}

int carl9170_led_register(struct ar9170 *ar)
{
	int err;

Annotation

Implementation Notes