static void pnpacpi_encode_dma()

in pnpacpi/rsparser.c [715:761]

• 41 lines of code
• 8 McCabe index (conditional complexity)

static void pnpacpi_encode_dma(struct pnp_dev *dev,
			       struct acpi_resource *resource,
			       struct resource *p)
{
	struct acpi_resource_dma *dma = &resource->data.dma;

	if (!pnp_resource_enabled(p)) {
		dma->channel_count = 0;
		pnp_dbg(&dev->dev, "  encode dma (%s)\n",
			p ? "disabled" : "missing");
		return;
	}

	/* Note: pnp_assign_dma will copy pnp_dma->flags into p->flags */
	switch (p->flags & IORESOURCE_DMA_SPEED_MASK) {
	case IORESOURCE_DMA_TYPEA:
		dma->type = ACPI_TYPE_A;
		break;
	case IORESOURCE_DMA_TYPEB:
		dma->type = ACPI_TYPE_B;
		break;
	case IORESOURCE_DMA_TYPEF:
		dma->type = ACPI_TYPE_F;
		break;
	default:
		dma->type = ACPI_COMPATIBILITY;
	}

	switch (p->flags & IORESOURCE_DMA_TYPE_MASK) {
	case IORESOURCE_DMA_8BIT:
		dma->transfer = ACPI_TRANSFER_8;
		break;
	case IORESOURCE_DMA_8AND16BIT:
		dma->transfer = ACPI_TRANSFER_8_16;
		break;
	default:
		dma->transfer = ACPI_TRANSFER_16;
	}

	dma->bus_master = !!(p->flags & IORESOURCE_DMA_MASTER);
	dma->channel_count = 1;
	dma->channels[0] = p->start;

	pnp_dbg(&dev->dev, "  encode dma %d "
		"type %#x transfer %#x master %d\n",
		(int) p->start, dma->type, dma->transfer, dma->bus_master);
}