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

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

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/ath/ath9k/wmi.c
Extension
.c
Size
9537 bytes
Lines
370
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 (!skb) {
			spin_unlock_irqrestore(&wmi->wmi_lock, flags);
			return;
		}
		spin_unlock_irqrestore(&wmi->wmi_lock, flags);

		/* Check if ath9k_htc_probe_device() completed. */
		if (!data_race(priv->initialized)) {
			kfree_skb(skb);
			continue;
		}

		hdr = (struct wmi_cmd_hdr *) skb->data;
		cmd_id = be16_to_cpu(hdr->command_id);
		wmi_event = skb_pull(skb, sizeof(struct wmi_cmd_hdr));

		switch (cmd_id) {
		case WMI_SWBA_EVENTID:
			swba = wmi_event;
			ath9k_htc_swba(priv, swba);
			break;
		case WMI_FATAL_EVENTID:
			ieee80211_queue_work(wmi->drv_priv->hw,
					     &wmi->drv_priv->fatal_work);
			break;
		case WMI_TXSTATUS_EVENTID:
			spin_lock_bh(&priv->tx.tx_lock);
			if (priv->tx.flags & ATH9K_HTC_OP_TX_DRAIN) {
				spin_unlock_bh(&priv->tx.tx_lock);
				break;
			}
			spin_unlock_bh(&priv->tx.tx_lock);

			ath9k_htc_txstatus(priv, wmi_event);
			break;
		default:
			break;
		}

		kfree_skb(skb);
	} while (1);
}

void ath9k_fatal_work(struct work_struct *work)
{
	struct ath9k_htc_priv *priv = container_of(work, struct ath9k_htc_priv,
						   fatal_work);
	struct ath_common *common = ath9k_hw_common(priv->ah);

	ath_dbg(common, FATAL, "FATAL Event received, resetting device\n");
	ath9k_htc_reset(priv);
}

static void ath9k_wmi_rsp_callback(struct wmi *wmi, struct sk_buff *skb)
{
	skb_pull(skb, sizeof(struct wmi_cmd_hdr));

	if (wmi->cmd_rsp_buf != NULL && wmi->cmd_rsp_len != 0)
		memcpy(wmi->cmd_rsp_buf, skb->data, wmi->cmd_rsp_len);

	complete(&wmi->cmd_wait);
}

static void ath9k_wmi_ctrl_rx(void *priv, struct sk_buff *skb,
			      enum htc_endpoint_id epid)
{
	struct wmi *wmi = priv;
	struct wmi_cmd_hdr *hdr;
	unsigned long flags;
	u16 cmd_id;

	if (unlikely(wmi->stopped))
		goto free_skb;

	/* Validate the obtained SKB. */
	if (unlikely(skb->len < sizeof(struct wmi_cmd_hdr)))
		goto free_skb;

	hdr = (struct wmi_cmd_hdr *) skb->data;
	cmd_id = be16_to_cpu(hdr->command_id);

	if (cmd_id & 0x1000) {
		spin_lock_irqsave(&wmi->wmi_lock, flags);
		__skb_queue_tail(&wmi->wmi_event_queue, skb);
		spin_unlock_irqrestore(&wmi->wmi_lock, flags);
		tasklet_schedule(&wmi->wmi_event_tasklet);
		return;
	}

	/* Check if there has been a timeout. */

Annotation

Implementation Notes