static int usb_extcon_probe()

in extcon-usb-gpio.c [97:194]

• 79 lines of code
• 19 McCabe index (conditional complexity)

static int usb_extcon_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct usb_extcon_info *info;
	int ret;

	if (!np)
		return -EINVAL;

	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->dev = dev;
	info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN);
	info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",
						   GPIOD_IN);

	if (!info->id_gpiod && !info->vbus_gpiod) {
		dev_err(dev, "failed to get gpios\n");
		return -ENODEV;
	}

	if (IS_ERR(info->id_gpiod))
		return PTR_ERR(info->id_gpiod);

	if (IS_ERR(info->vbus_gpiod))
		return PTR_ERR(info->vbus_gpiod);

	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	ret = devm_extcon_dev_register(dev, info->edev);
	if (ret < 0) {
		dev_err(dev, "failed to register extcon device\n");
		return ret;
	}

	if (info->id_gpiod)
		ret = gpiod_set_debounce(info->id_gpiod,
					 USB_GPIO_DEBOUNCE_MS * 1000);
	if (!ret && info->vbus_gpiod)
		ret = gpiod_set_debounce(info->vbus_gpiod,
					 USB_GPIO_DEBOUNCE_MS * 1000);

	if (ret < 0)
		info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);

	INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);

	if (info->id_gpiod) {
		info->id_irq = gpiod_to_irq(info->id_gpiod);
		if (info->id_irq < 0) {
			dev_err(dev, "failed to get ID IRQ\n");
			return info->id_irq;
		}

		ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
						usb_irq_handler,
						IRQF_TRIGGER_RISING |
						IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
						pdev->name, info);
		if (ret < 0) {
			dev_err(dev, "failed to request handler for ID IRQ\n");
			return ret;
		}
	}

	if (info->vbus_gpiod) {
		info->vbus_irq = gpiod_to_irq(info->vbus_gpiod);
		if (info->vbus_irq < 0) {
			dev_err(dev, "failed to get VBUS IRQ\n");
			return info->vbus_irq;
		}

		ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
						usb_irq_handler,
						IRQF_TRIGGER_RISING |
						IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
						pdev->name, info);
		if (ret < 0) {
			dev_err(dev, "failed to request handler for VBUS IRQ\n");
			return ret;
		}
	}

	platform_set_drvdata(pdev, info);
	device_set_wakeup_capable(&pdev->dev, true);

	/* Perform initial detection */
	usb_extcon_detect_cable(&info->wq_detcable.work);

	return 0;
}