drivers/net/wireless/intersil/p54/p54spi.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/intersil/p54/p54spi.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/intersil/p54/p54spi.c
Extension
.c
Size
15861 bytes
Lines
686
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 (ret < 0) {
			p54_free_skb(priv->hw, skb);
			return ret;
		}

		spin_lock_irqsave(&priv->tx_lock, flags);
	}
	spin_unlock_irqrestore(&priv->tx_lock, flags);
	return ret;
}

static void p54spi_op_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
{
	struct p54s_priv *priv = dev->priv;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct p54_tx_info *mi = (struct p54_tx_info *) info->rate_driver_data;
	struct p54s_tx_info *di = (struct p54s_tx_info *) mi->data;
	unsigned long flags;

	BUILD_BUG_ON(sizeof(*di) > sizeof((mi->data)));

	spin_lock_irqsave(&priv->tx_lock, flags);
	list_add_tail(&di->tx_list, &priv->tx_pending);
	spin_unlock_irqrestore(&priv->tx_lock, flags);

	ieee80211_queue_work(priv->hw, &priv->work);
}

static void p54spi_work(struct work_struct *work)
{
	struct p54s_priv *priv = container_of(work, struct p54s_priv, work);
	u32 ints;
	int ret;

	mutex_lock(&priv->mutex);

	if (priv->fw_state == FW_STATE_OFF)
		goto out;

	ints = p54spi_read32(priv, SPI_ADRS_HOST_INTERRUPTS);

	if (ints & SPI_HOST_INT_READY) {
		p54spi_int_ready(priv);
		p54spi_int_ack(priv, SPI_HOST_INT_READY);
	}

	if (priv->fw_state != FW_STATE_READY)
		goto out;

	if (ints & SPI_HOST_INT_UPDATE) {
		p54spi_int_ack(priv, SPI_HOST_INT_UPDATE);
		ret = p54spi_rx(priv);
		if (ret < 0)
			goto out;
	}
	if (ints & SPI_HOST_INT_SW_UPDATE) {
		p54spi_int_ack(priv, SPI_HOST_INT_SW_UPDATE);
		ret = p54spi_rx(priv);
		if (ret < 0)
			goto out;
	}

	ret = p54spi_wq_tx(priv);
out:
	mutex_unlock(&priv->mutex);
}

static int p54spi_op_start(struct ieee80211_hw *dev)
{
	struct p54s_priv *priv = dev->priv;
	long time_left;
	int ret = 0;

	if (mutex_lock_interruptible(&priv->mutex)) {
		ret = -EINTR;
		goto out;
	}

	priv->fw_state = FW_STATE_BOOTING;

	p54spi_power_on(priv);

	ret = p54spi_upload_firmware(dev);
	if (ret < 0) {
		p54spi_power_off(priv);
		goto out_unlock;
	}

	mutex_unlock(&priv->mutex);

Annotation

Implementation Notes