static acpi_status pnpacpi_allocated_resource()

in pnpacpi/rsparser.c [164:268]

• 84 lines of code
• 26 McCabe index (conditional complexity)

static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,
					      void *data)
{
	struct pnp_dev *dev = data;
	struct acpi_resource_dma *dma;
	struct acpi_resource_vendor_typed *vendor_typed;
	struct acpi_resource_gpio *gpio;
	struct resource_win win = {{0}, 0};
	struct resource *r = &win.res;
	int i, flags;

	if (acpi_dev_resource_address_space(res, &win)
	    || acpi_dev_resource_ext_address_space(res, &win)) {
		pnp_add_resource(dev, &win.res);
		return AE_OK;
	}

	r->flags = 0;
	if (acpi_dev_resource_interrupt(res, 0, r)) {
		pnpacpi_add_irqresource(dev, r);
		for (i = 1; acpi_dev_resource_interrupt(res, i, r); i++)
			pnpacpi_add_irqresource(dev, r);

		if (i > 1) {
			/*
			 * The IRQ encoder puts a single interrupt in each
			 * descriptor, so if a _CRS descriptor has more than
			 * one interrupt, we won't be able to re-encode it.
			 */
			if (pnp_can_write(dev)) {
				dev_warn(&dev->dev,
					 "multiple interrupts in _CRS descriptor; configuration can't be changed\n");
				dev->capabilities &= ~PNP_WRITE;
			}
		}
		return AE_OK;
	} else if (acpi_gpio_get_irq_resource(res, &gpio)) {
		/*
		 * If the resource is GpioInt() type then extract the IRQ
		 * from GPIO resource and fill it into IRQ resource type.
		 */
		i = acpi_dev_gpio_irq_get(dev->data, 0);
		if (i >= 0) {
			flags = acpi_dev_irq_flags(gpio->triggering,
						   gpio->polarity,
						   gpio->shareable);
		} else {
			flags = IORESOURCE_DISABLED;
		}
		pnp_add_irq_resource(dev, i, flags);
		return AE_OK;
	} else if (r->flags & IORESOURCE_DISABLED) {
		pnp_add_irq_resource(dev, 0, IORESOURCE_DISABLED);
		return AE_OK;
	}

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_MEMORY24:
	case ACPI_RESOURCE_TYPE_MEMORY32:
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
		if (acpi_dev_resource_memory(res, r))
			pnp_add_resource(dev, r);
		break;
	case ACPI_RESOURCE_TYPE_IO:
	case ACPI_RESOURCE_TYPE_FIXED_IO:
		if (acpi_dev_resource_io(res, r))
			pnp_add_resource(dev, r);
		break;
	case ACPI_RESOURCE_TYPE_DMA:
		dma = &res->data.dma;
		if (dma->channel_count > 0 && dma->channels[0] != (u8) -1)
			flags = dma_flags(dev, dma->type, dma->bus_master,
					  dma->transfer);
		else
			flags = IORESOURCE_DISABLED;
		pnp_add_dma_resource(dev, dma->channels[0], flags);
		break;

	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
	case ACPI_RESOURCE_TYPE_END_DEPENDENT:
		break;

	case ACPI_RESOURCE_TYPE_VENDOR:
		vendor_typed = &res->data.vendor_typed;
		pnpacpi_parse_allocated_vendor(dev, vendor_typed);
		break;

	case ACPI_RESOURCE_TYPE_END_TAG:
		break;

	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
		break;

	case ACPI_RESOURCE_TYPE_SERIAL_BUS:
		/* serial bus connections (I2C/SPI/UART) are not pnp */
		break;

	default:
		dev_warn(&dev->dev, "unknown resource type %d in _CRS\n",
			 res->type);
		return AE_ERROR;
	}

	return AE_OK;
}