static int ap_probe()

in es2.c [1244:1435]

• 155 lines of code
• 25 McCabe index (conditional complexity)

static int ap_probe(struct usb_interface *interface,
		    const struct usb_device_id *id)
{
	struct es2_ap_dev *es2;
	struct gb_host_device *hd;
	struct usb_device *udev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	__u8 ep_addr;
	int retval;
	int i;
	int num_cports;
	bool bulk_out_found = false;
	bool bulk_in_found = false;
	bool arpc_in_found = false;

	udev = usb_get_dev(interface_to_usbdev(interface));

	num_cports = apb_get_cport_count(udev);
	if (num_cports < 0) {
		usb_put_dev(udev);
		dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
			num_cports);
		return num_cports;
	}

	hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX,
			  num_cports);
	if (IS_ERR(hd)) {
		usb_put_dev(udev);
		return PTR_ERR(hd);
	}

	es2 = hd_to_es2(hd);
	es2->hd = hd;
	es2->usb_intf = interface;
	es2->usb_dev = udev;
	spin_lock_init(&es2->cport_out_urb_lock);
	INIT_KFIFO(es2->apb_log_fifo);
	usb_set_intfdata(interface, es2);

	/*
	 * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated
	 * dynamically.
	 */
	retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0);
	if (retval)
		goto error;
	retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1);
	if (retval)
		goto error;

	/* find all bulk endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;
		ep_addr = endpoint->bEndpointAddress;

		if (usb_endpoint_is_bulk_in(endpoint)) {
			if (!bulk_in_found) {
				es2->cport_in.endpoint = ep_addr;
				bulk_in_found = true;
			} else if (!arpc_in_found) {
				es2->arpc_endpoint_in = ep_addr;
				arpc_in_found = true;
			} else {
				dev_warn(&udev->dev,
					 "Unused bulk IN endpoint found: 0x%02x\n",
					 ep_addr);
			}
			continue;
		}
		if (usb_endpoint_is_bulk_out(endpoint)) {
			if (!bulk_out_found) {
				es2->cport_out_endpoint = ep_addr;
				bulk_out_found = true;
			} else {
				dev_warn(&udev->dev,
					 "Unused bulk OUT endpoint found: 0x%02x\n",
					 ep_addr);
			}
			continue;
		}
		dev_warn(&udev->dev,
			 "Unknown endpoint type found, address 0x%02x\n",
			 ep_addr);
	}
	if (!bulk_in_found || !arpc_in_found || !bulk_out_found) {
		dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
		retval = -ENODEV;
		goto error;
	}

	/* Allocate buffers for our cport in messages */
	for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
		struct urb *urb;
		u8 *buffer;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}
		es2->cport_in.urb[i] = urb;

		buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
		if (!buffer) {
			retval = -ENOMEM;
			goto error;
		}

		usb_fill_bulk_urb(urb, udev,
				  usb_rcvbulkpipe(udev, es2->cport_in.endpoint),
				  buffer, ES2_GBUF_MSG_SIZE_MAX,
				  cport_in_callback, hd);

		es2->cport_in.buffer[i] = buffer;
	}

	/* Allocate buffers for ARPC in messages */
	for (i = 0; i < NUM_ARPC_IN_URB; ++i) {
		struct urb *urb;
		u8 *buffer;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}
		es2->arpc_urb[i] = urb;

		buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL);
		if (!buffer) {
			retval = -ENOMEM;
			goto error;
		}

		usb_fill_bulk_urb(urb, udev,
				  usb_rcvbulkpipe(udev,
						  es2->arpc_endpoint_in),
				  buffer, ARPC_IN_SIZE_MAX,
				  arpc_in_callback, es2);

		es2->arpc_buffer[i] = buffer;
	}

	/* Allocate urbs for our CPort OUT messages */
	for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
		struct urb *urb;

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			retval = -ENOMEM;
			goto error;
		}

		es2->cport_out_urb[i] = urb;
		es2->cport_out_urb_busy[i] = false;	/* just to be anal */
	}

	/* XXX We will need to rename this per APB */
	es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable",
							 0644,
							 gb_debugfs_get(), es2,
							 &apb_log_enable_fops);

	INIT_LIST_HEAD(&es2->arpcs);
	spin_lock_init(&es2->arpc_lock);

	retval = es2_arpc_in_enable(es2);
	if (retval)
		goto error;

	retval = gb_hd_add(hd);
	if (retval)
		goto err_disable_arpc_in;

	retval = es2_cport_in_enable(es2, &es2->cport_in);
	if (retval)
		goto err_hd_del;

	return 0;

err_hd_del:
	gb_hd_del(hd);
err_disable_arpc_in:
	es2_arpc_in_disable(es2);
error:
	es2_destroy(es2);

	return retval;
}