drivers/net/ethernet/qualcomm/qca_uart.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/qualcomm/qca_uart.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/qualcomm/qca_uart.c
Extension
.c
Size
9558 bytes
Lines
403
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct net_device_ops qcauart_netdev_ops = {
	.ndo_init = qcauart_netdev_init,
	.ndo_uninit = qcauart_netdev_uninit,
	.ndo_open = qcauart_netdev_open,
	.ndo_stop = qcauart_netdev_close,
	.ndo_start_xmit = qcauart_netdev_xmit,
	.ndo_set_mac_address = eth_mac_addr,
	.ndo_tx_timeout = qcauart_netdev_tx_timeout,
	.ndo_validate_addr = eth_validate_addr,
};

static void qcauart_netdev_setup(struct net_device *dev)
{
	dev->netdev_ops = &qcauart_netdev_ops;
	dev->watchdog_timeo = QCAUART_TX_TIMEOUT;
	dev->priv_flags &= ~IFF_TX_SKB_SHARING;
	dev->tx_queue_len = 100;

	/* MTU range: 46 - 1500 */
	dev->min_mtu = QCAFRM_MIN_MTU;
	dev->max_mtu = QCAFRM_MAX_MTU;
}

static const struct of_device_id qca_uart_of_match[] = {
	{
	 .compatible = "qca,qca7000",
	},
	{}
};
MODULE_DEVICE_TABLE(of, qca_uart_of_match);

static int qca_uart_probe(struct serdev_device *serdev)
{
	struct net_device *qcauart_dev = alloc_etherdev(sizeof(struct qcauart));
	struct qcauart *qca;
	u32 speed = 115200;
	int ret;

	if (!qcauart_dev)
		return -ENOMEM;

	qcauart_netdev_setup(qcauart_dev);
	SET_NETDEV_DEV(qcauart_dev, &serdev->dev);

	qca = netdev_priv(qcauart_dev);
	if (!qca) {
		pr_err("qca_uart: Fail to retrieve private structure\n");
		ret = -ENOMEM;
		goto free;
	}
	qca->net_dev = qcauart_dev;
	qca->serdev = serdev;
	qcafrm_fsm_init_uart(&qca->frm_handle);

	spin_lock_init(&qca->lock);
	INIT_WORK(&qca->tx_work, qcauart_transmit);

	of_property_read_u32(serdev->dev.of_node, "current-speed", &speed);

	ret = of_get_ethdev_address(serdev->dev.of_node, qca->net_dev);
	if (ret) {
		eth_hw_addr_random(qca->net_dev);
		dev_info(&serdev->dev, "Using random MAC address: %pM\n",
			 qca->net_dev->dev_addr);
	}

	netif_carrier_on(qca->net_dev);
	serdev_device_set_drvdata(serdev, qca);
	serdev_device_set_client_ops(serdev, &qca_serdev_ops);

	ret = serdev_device_open(serdev);
	if (ret) {
		dev_err(&serdev->dev, "Unable to open device %s\n",
			qcauart_dev->name);
		goto free;
	}

	speed = serdev_device_set_baudrate(serdev, speed);
	dev_info(&serdev->dev, "Using baudrate: %u\n", speed);

	serdev_device_set_flow_control(serdev, false);

	ret = register_netdev(qcauart_dev);
	if (ret) {
		dev_err(&serdev->dev, "Unable to register net device %s\n",
			qcauart_dev->name);
		serdev_device_close(serdev);
		cancel_work_sync(&qca->tx_work);
		goto free;
	}

Annotation

Implementation Notes