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

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

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/ath9k/channel.c
Extension
.c
Size
42985 bytes
Lines
1645
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

list_for_each_entry(avp, &ctx->vifs, list) {
			vif = avp->vif;

			if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO) {
				spin_unlock_bh(&sc->chan_lock);
				return ctx;
			}
		}
	}

	spin_unlock_bh(&sc->chan_lock);
	return NULL;
}

/**********************************************************/
/* Functions to handle the channel context state machine. */
/**********************************************************/

static const char *offchannel_state_string(enum ath_offchannel_state state)
{
	switch (state) {
		case_rtn_string(ATH_OFFCHANNEL_IDLE);
		case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
		case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
		case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
		case_rtn_string(ATH_OFFCHANNEL_ROC_START);
		case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
		case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
	default:
		return "unknown";
	}
}

static const char *chanctx_event_string(enum ath_chanctx_event ev)
{
	switch (ev) {
		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
		case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
		case_rtn_string(ATH_CHANCTX_EVENT_AUTHORIZED);
		case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
		case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
		case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
		case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
		case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
	default:
		return "unknown";
	}
}

static const char *chanctx_state_string(enum ath_chanctx_state state)
{
	switch (state) {
		case_rtn_string(ATH_CHANCTX_STATE_IDLE);
		case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
		case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
		case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
		case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
	default:
		return "unknown";
	}
}

static u32 chanctx_event_delta(struct ath_softc *sc)
{
	ktime_t ts = ktime_get_raw();
	s64 ms = ktime_ms_delta(ts, sc->last_event_time);

	sc->last_event_time = ts;
	return ms;
}

void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
{
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
	struct ath_chanctx *ictx;
	struct ath_vif *avp;
	bool active = false;
	u8 n_active = 0;

	if (!ctx)
		return;

	if (ctx == &sc->offchannel.chan) {
		spin_lock_bh(&sc->chan_lock);

		if (likely(sc->sched.channel_switch_time))
			ctx->flush_timeout =
				usecs_to_jiffies(sc->sched.channel_switch_time);

Annotation

Implementation Notes