drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
Extension
.c
Size
50059 bytes
Lines
1698
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

struct rtl8187_async_write_data {
		u8 data[4];
		struct usb_ctrlrequest dr;
	} *buf;
	int rc;

	buf = kmalloc_obj(*buf, GFP_ATOMIC);
	if (!buf)
		return;

	urb = usb_alloc_urb(0, GFP_ATOMIC);
	if (!urb) {
		kfree(buf);
		return;
	}

	dr = &buf->dr;

	dr->bRequestType = RTL8187_REQT_WRITE;
	dr->bRequest = RTL8187_REQ_SET_REG;
	dr->wValue = addr;
	dr->wIndex = 0;
	dr->wLength = cpu_to_le16(len);

	memcpy(buf, data, len);

	usb_fill_control_urb(urb, priv->udev, usb_sndctrlpipe(priv->udev, 0),
			     (unsigned char *)dr, buf, len,
			     rtl8187_iowrite_async_cb, buf);
	usb_anchor_urb(urb, &priv->anchored);
	rc = usb_submit_urb(urb, GFP_ATOMIC);
	if (rc < 0) {
		kfree(buf);
		usb_unanchor_urb(urb);
	}
	usb_free_urb(urb);
}

static inline void rtl818x_iowrite32_async(struct rtl8187_priv *priv,
					   __le32 *addr, u32 val)
{
	__le32 buf = cpu_to_le32(val);

	rtl8187_iowrite_async(priv, cpu_to_le16((unsigned long)addr),
			      &buf, sizeof(buf));
}

void rtl8187_write_phy(struct ieee80211_hw *dev, u8 addr, u32 data)
{
	struct rtl8187_priv *priv = dev->priv;

	data <<= 8;
	data |= addr | 0x80;

	rtl818x_iowrite8(priv, &priv->map->PHY[3], (data >> 24) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[2], (data >> 16) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[1], (data >> 8) & 0xFF);
	rtl818x_iowrite8(priv, &priv->map->PHY[0], data & 0xFF);
}

static void rtl8187_tx_cb(struct urb *urb)
{
	struct sk_buff *skb = (struct sk_buff *)urb->context;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_hw *hw = info->rate_driver_data[0];
	struct rtl8187_priv *priv = hw->priv;

	skb_pull(skb, priv->is_rtl8187b ? sizeof(struct rtl8187b_tx_hdr) :
					  sizeof(struct rtl8187_tx_hdr));
	ieee80211_tx_info_clear_status(info);

	if (!(urb->status) && !(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
		if (priv->is_rtl8187b) {
			skb_queue_tail(&priv->b_tx_status.queue, skb);

			/* queue is "full", discard last items */
			while (skb_queue_len(&priv->b_tx_status.queue) > 5) {
				struct sk_buff *old_skb;

				dev_dbg(&priv->udev->dev,
					"transmit status queue full\n");

				old_skb = skb_dequeue(&priv->b_tx_status.queue);
				ieee80211_tx_status_irqsafe(hw, old_skb);
			}
			return;
		} else {
			info->flags |= IEEE80211_TX_STAT_ACK;
		}
	}

Annotation

Implementation Notes