drivers/pnp/manager.c

Source file repositories/reference/linux-study-clean/drivers/pnp/manager.c

File Facts

System
Linux kernel
Corpus path
drivers/pnp/manager.c
Extension
.c
Size
10057 bytes
Lines
430
Domain
Driver Families
Bucket
drivers/pnp
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (res->start > rule->max || !rule->align) {
			pnp_dbg(&dev->dev, "  couldn't assign io %d "
				"(min %#llx max %#llx)\n", idx,
				(unsigned long long) rule->min,
				(unsigned long long) rule->max);
			return -EBUSY;
		}
	}

__add:
	pnp_add_io_resource(dev, res->start, res->end, res->flags);
	return 0;
}

static int pnp_assign_mem(struct pnp_dev *dev, struct pnp_mem *rule, int idx)
{
	struct resource *res, local_res;

	res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx);
	if (res) {
		pnp_dbg(&dev->dev, "  mem %d already set to %#llx-%#llx "
			"flags %#lx\n", idx, (unsigned long long) res->start,
			(unsigned long long) res->end, res->flags);
		return 0;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = 0;
	res->end = 0;

	/* ??? rule->flags restricted to 8 bits, all tests bogus ??? */
	if (!(rule->flags & IORESOURCE_MEM_WRITEABLE))
		res->flags |= IORESOURCE_READONLY;
	if (rule->flags & IORESOURCE_MEM_RANGELENGTH)
		res->flags |= IORESOURCE_RANGELENGTH;
	if (rule->flags & IORESOURCE_MEM_SHADOWABLE)
		res->flags |= IORESOURCE_SHADOWABLE;

	if (!rule->size) {
		res->flags |= IORESOURCE_DISABLED;
		pnp_dbg(&dev->dev, "  mem %d disabled\n", idx);
		goto __add;
	}

	res->start = rule->min;
	res->end = res->start + rule->size - 1;

	while (!pnp_check_mem(dev, res)) {
		res->start += rule->align;
		res->end = res->start + rule->size - 1;
		if (res->start > rule->max || !rule->align) {
			pnp_dbg(&dev->dev, "  couldn't assign mem %d "
				"(min %#llx max %#llx)\n", idx,
				(unsigned long long) rule->min,
				(unsigned long long) rule->max);
			return -EBUSY;
		}
	}

__add:
	pnp_add_mem_resource(dev, res->start, res->end, res->flags);
	return 0;
}

static int pnp_assign_irq(struct pnp_dev *dev, struct pnp_irq *rule, int idx)
{
	struct resource *res, local_res;
	int i;

	/* IRQ priority: this table is good for i386 */
	static unsigned short xtab[16] = {
		5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2
	};

	res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx);
	if (res) {
		pnp_dbg(&dev->dev, "  irq %d already set to %d flags %#lx\n",
			idx, (int) res->start, res->flags);
		return 0;
	}

	res = &local_res;
	res->flags = rule->flags | IORESOURCE_AUTO;
	res->start = -1;
	res->end = -1;

	if (bitmap_empty(rule->map.bits, PNP_IRQ_NR)) {
		res->flags |= IORESOURCE_DISABLED;
		pnp_dbg(&dev->dev, "  irq %d disabled\n", idx);

Annotation

Implementation Notes