kaweth.c

	kaweth->dev = udev;
	kaweth->net = netdev;
	kaweth->intf = intf;

	spin_lock_init(&kaweth->device_lock);
	init_waitqueue_head(&kaweth->term_wait);

	dev_dbg(dev, "Resetting.\n");

	kaweth_reset(kaweth);

	/*
	 * If high byte of bcdDevice is nonzero, firmware is already
	 * downloaded. Don't try to do it again, or we'll hang the device.
	 */

	if (le16_to_cpu(udev->descriptor.bcdDevice) >> 8) {
		dev_info(dev, "Firmware present in device.\n");
	} else {
		/* Download the firmware */
		dev_info(dev, "Downloading firmware...\n");
		kaweth->firmware_buf = (__u8 *)__get_free_page(GFP_KERNEL);
		if (!kaweth->firmware_buf) {
			rv = -ENOMEM;
			goto err_free_netdev;
		}
		if ((result = kaweth_download_firmware(kaweth,
						      "kaweth/new_code.bin",
						      100,
						      2)) < 0) {
			dev_err(dev, "Error downloading firmware (%d)\n",
				result);
			goto err_fw;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      "kaweth/new_code_fix.bin",
						      100,
						      3)) < 0) {
			dev_err(dev, "Error downloading firmware fix (%d)\n",
				result);
			goto err_fw;
		}

		if ((result = kaweth_download_firmware(kaweth,
						      "kaweth/trigger_code.bin",
						      126,
						      2)) < 0) {
			dev_err(dev, "Error downloading trigger code (%d)\n",
				result);
			goto err_fw;

		}

		if ((result = kaweth_download_firmware(kaweth,
						      "kaweth/trigger_code_fix.bin",
						      126,
						      3)) < 0) {
			dev_err(dev, "Error downloading trigger code fix (%d)\n", result);
			goto err_fw;
		}


		if ((result = kaweth_trigger_firmware(kaweth, 126)) < 0) {
			dev_err(dev, "Error triggering firmware (%d)\n", result);
			goto err_fw;
		}

		/* Device will now disappear for a moment...  */
		dev_info(dev, "Firmware loaded.  I'll be back...\n");
err_fw:
		free_page((unsigned long)kaweth->firmware_buf);
		free_netdev(netdev);
		return -EIO;
	}

	result = kaweth_read_configuration(kaweth);

	if(result < 0) {
		dev_err(dev, "Error reading configuration (%d), no net device created\n", result);
		goto err_free_netdev;
	}

	dev_info(dev, "Statistics collection: %x\n", kaweth->configuration.statistics_mask);
	dev_info(dev, "Multicast filter limit: %x\n", kaweth->configuration.max_multicast_filters & ((1 << 15) - 1));
	dev_info(dev, "MTU: %d\n", le16_to_cpu(kaweth->configuration.segment_size));
	dev_info(dev, "Read MAC address %pM\n", kaweth->configuration.hw_addr);

	if(!memcmp(&kaweth->configuration.hw_addr,
                   &bcast_addr,
		   sizeof(bcast_addr))) {
		dev_err(dev, "Firmware not functioning properly, no net device created\n");
		goto err_free_netdev;
	}

	if(kaweth_set_urb_size(kaweth, KAWETH_BUF_SIZE) < 0) {
		dev_dbg(dev, "Error setting URB size\n");
		goto err_free_netdev;
	}

	if(kaweth_set_sofs_wait(kaweth, KAWETH_SOFS_TO_WAIT) < 0) {
		dev_err(dev, "Error setting SOFS wait\n");
		goto err_free_netdev;
	}

	result = kaweth_set_receive_filter(kaweth,
                                           KAWETH_PACKET_FILTER_DIRECTED |
                                           KAWETH_PACKET_FILTER_BROADCAST |
                                           KAWETH_PACKET_FILTER_MULTICAST);

	if(result < 0) {
		dev_err(dev, "Error setting receive filter\n");
		goto err_free_netdev;
	}

	dev_dbg(dev, "Initializing net device.\n");

	kaweth->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->tx_urb)
		goto err_free_netdev;
	kaweth->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->rx_urb)
		goto err_only_tx;
	kaweth->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!kaweth->irq_urb)
		goto err_tx_and_rx;

	kaweth->intbuffer = usb_alloc_coherent(	kaweth->dev,
						INTBUFFERSIZE,
						GFP_KERNEL,
						&kaweth->intbufferhandle);
	if (!kaweth->intbuffer)
		goto err_tx_and_rx_and_irq;
	kaweth->rx_buf = usb_alloc_coherent(	kaweth->dev,
						KAWETH_BUF_SIZE,
						GFP_KERNEL,
						&kaweth->rxbufferhandle);
	if (!kaweth->rx_buf)
		goto err_all_but_rxbuf;

	memcpy(netdev->broadcast, &bcast_addr, sizeof(bcast_addr));
	memcpy(netdev->dev_addr, &kaweth->configuration.hw_addr,
               sizeof(kaweth->configuration.hw_addr));

	netdev->netdev_ops = &kaweth_netdev_ops;
	netdev->watchdog_timeo = KAWETH_TX_TIMEOUT;
	netdev->mtu = le16_to_cpu(kaweth->configuration.segment_size);
	netdev->ethtool_ops = &ops;

	/* kaweth is zeroed as part of alloc_netdev */
	INIT_DELAYED_WORK(&kaweth->lowmem_work, kaweth_resubmit_tl);
	usb_set_intfdata(intf, kaweth);

	SET_NETDEV_DEV(netdev, dev);
	if (register_netdev(netdev) != 0) {
		dev_err(dev, "Error registering netdev.\n");
		goto err_intfdata;
	}

	dev_info(dev, "kaweth interface created at %s\n",
		 kaweth->net->name);

	return 0;

err_intfdata:
	usb_set_intfdata(intf, NULL);
	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
err_all_but_rxbuf:
	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);
err_tx_and_rx_and_irq:
	usb_free_urb(kaweth->irq_urb);
err_tx_and_rx:
	usb_free_urb(kaweth->rx_urb);
err_only_tx:
	usb_free_urb(kaweth->tx_urb);
err_free_netdev:
	free_netdev(netdev);

	return rv;
}

/****************************************************************
 *     kaweth_disconnect
 ****************************************************************/
static void kaweth_disconnect(struct usb_interface *intf)
{
	struct kaweth_device *kaweth = usb_get_intfdata(intf);
	struct net_device *netdev;

	usb_set_intfdata(intf, NULL);
	if (!kaweth) {
		dev_warn(&intf->dev, "unregistering non-existent device\n");
		return;
	}
	netdev = kaweth->net;

	netdev_dbg(kaweth->net, "Unregistering net device\n");
	unregister_netdev(netdev);

	usb_free_urb(kaweth->rx_urb);
	usb_free_urb(kaweth->tx_urb);
	usb_free_urb(kaweth->irq_urb);

	usb_free_coherent(kaweth->dev, KAWETH_BUF_SIZE, (void *)kaweth->rx_buf, kaweth->rxbufferhandle);
	usb_free_coherent(kaweth->dev, INTBUFFERSIZE, (void *)kaweth->intbuffer, kaweth->intbufferhandle);

	free_netdev(netdev);
}


// FIXME this completion stuff is a modified clone of
// an OLD version of some stuff in usb.c ...
struct usb_api_data {
	wait_queue_head_t wqh;
	int done;
};

/*-------------------------------------------------------------------*
 * completion handler for compatibility wrappers (sync control/bulk) *
 *-------------------------------------------------------------------*/
static void usb_api_blocking_completion(struct urb *urb)
{
        struct usb_api_data *awd = (struct usb_api_data *)urb->context;

	awd->done=1;
	wake_up(&awd->wqh);
}

/*-------------------------------------------------------------------*
 *                         COMPATIBILITY STUFF                       *
 *-------------------------------------------------------------------*/

// Starts urb and waits for completion or timeout
static int usb_start_wait_urb(struct urb *urb, int timeout, int* actual_length)
{
	struct usb_api_data awd;
        int status;

        init_waitqueue_head(&awd.wqh);
        awd.done = 0;

        urb->context = &awd;
        status = usb_submit_urb(urb, GFP_ATOMIC);
        if (status) {
                // something went wrong
                usb_free_urb(urb);
                return status;
        }

	if (!wait_event_timeout(awd.wqh, awd.done, timeout)) {
                // timeout
                dev_warn(&urb->dev->dev, "usb_control/bulk_msg: timeout\n");
                usb_kill_urb(urb);  // remove urb safely
                status = -ETIMEDOUT;
        }
	else {
                status = urb->status;
	}

        if (actual_length) {
                *actual_length = urb->actual_length;
	}

        usb_free_urb(urb);
        return status;
}

/*-------------------------------------------------------------------*/
// returns status (negative) or length (positive)
static int kaweth_internal_control_msg(struct usb_device *usb_dev,
				       unsigned int pipe,
				       struct usb_ctrlrequest *cmd, void *data,
				       int len, int timeout)
{
        struct urb *urb;
        int retv;
        int length = 0; /* shut up GCC */

	urb = usb_alloc_urb(0, GFP_ATOMIC);
        if (!urb)
                return -ENOMEM;

        usb_fill_control_urb(urb, usb_dev, pipe, (unsigned char*)cmd, data,
			 len, usb_api_blocking_completion, NULL);

        retv = usb_start_wait_urb(urb, timeout, &length);
        if (retv < 0) {
                return retv;
	}
        else {
                return length;
	}
}

module_usb_driver(kaweth_driver);