drivers/net/wireless/ath/ath9k/gpio.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/ath/ath9k/gpio.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/ath9k/gpio.c
Extension
.c
Size
14370 bytes
Lines
521
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

msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
		clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
		clear_bit(BT_OP_SCAN, &btcoex->op_flags);
		/* Detect if colocated bt started scanning */
		if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
			ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
				"BT scan detected\n");
			set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
			set_bit(BT_OP_SCAN, &btcoex->op_flags);
		} else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
			ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
				"BT priority traffic detected\n");
			set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
		}

		btcoex->bt_priority_cnt = 0;
		btcoex->bt_priority_time = jiffies;
	}
}

static void ath_mci_ftp_adjust(struct ath_softc *sc)
{
	struct ath_btcoex *btcoex = &sc->btcoex;
	struct ath_mci_profile *mci = &btcoex->mci;
	struct ath_hw *ah = sc->sc_ah;

	if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
		if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
		    (mci->num_pan || mci->num_other_acl))
			ah->btcoex_hw.mci.stomp_ftp =
				(sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
		else
			ah->btcoex_hw.mci.stomp_ftp = false;
		btcoex->bt_wait_time = 0;
		sc->rx.num_pkts = 0;
	}
}

/*
 * This is the master bt coex timer which runs for every
 * 45ms, bt traffic will be given priority during 55% of this
 * period while wlan gets remaining 45%
 */
static void ath_btcoex_period_timer(struct timer_list *t)
{
	struct ath_softc *sc = timer_container_of(sc, t, btcoex.period_timer);
	struct ath_hw *ah = sc->sc_ah;
	struct ath_btcoex *btcoex = &sc->btcoex;
	enum ath_stomp_type stomp_type;
	u32 timer_period;
	unsigned long flags;

	spin_lock_irqsave(&sc->sc_pm_lock, flags);
	if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
		btcoex->bt_wait_time += btcoex->btcoex_period;
		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
		goto skip_hw_wakeup;
	}
	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);

	ath9k_ps_wakeup(sc);
	spin_lock_bh(&btcoex->btcoex_lock);

	if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI) {
		ath9k_mci_update_rssi(sc);
		ath_mci_ftp_adjust(sc);
	}

	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
		ath_detect_bt_priority(sc);

	stomp_type = btcoex->bt_stomp_type;
	timer_period = btcoex->btcoex_no_stomp;

	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI)) {
		if (test_bit(BT_OP_SCAN, &btcoex->op_flags)) {
			stomp_type = ATH_BTCOEX_STOMP_ALL;
			timer_period = btcoex->btscan_no_stomp;
		}
	} else if (btcoex->stomp_audio >= 5) {
		stomp_type = ATH_BTCOEX_STOMP_AUDIO;
		btcoex->stomp_audio = 0;
	}

	ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
	ath9k_hw_btcoex_enable(ah);

	spin_unlock_bh(&btcoex->btcoex_lock);

	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp)

Annotation

Implementation Notes