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Commit 1b8e6966 authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Eric Anholt
Browse files

pnp: add PNP resource range checking function 



Add a PNP resource range check function, indicating whether a resource
has been assigned to any device.

Signed-off-by: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
[apw@canonical.com: fixed up exports et al]
Signed-off-by: default avatarAndy Whitcroft <apw@canonical.com>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
parent b66d18dd

drivers/pnp/resource.c

+18 −0
Original line number Diff line number Diff line
@@ -638,6 +638,24 @@ int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start, 
}

EXPORT_SYMBOL(pnp_possible_config);



int pnp_range_reserved(resource_size_t start, resource_size_t end)

{

	struct pnp_dev *dev;

	struct pnp_resource *pnp_res;

	resource_size_t *dev_start, *dev_end;



	pnp_for_each_dev(dev) {

		list_for_each_entry(pnp_res, &dev->resources, list) {

			dev_start = &pnp_res->res.start;

			dev_end   = &pnp_res->res.end;

			if (ranged_conflict(&start, &end, dev_start, dev_end))

				return 1;

		}

	}

	return 0;

}

EXPORT_SYMBOL(pnp_range_reserved);



/* format is: pnp_reserve_irq=irq1[,irq2] .... */

static int __init pnp_setup_reserve_irq(char *str)

{

include/linux/pnp.h

+2 −0
Original line number Diff line number Diff line
@@ -446,6 +446,7 @@ int pnp_start_dev(struct pnp_dev *dev); 
int pnp_stop_dev(struct pnp_dev *dev);

int pnp_activate_dev(struct pnp_dev *dev);

int pnp_disable_dev(struct pnp_dev *dev);

int pnp_range_reserved(resource_size_t start, resource_size_t end);



/* protocol helpers */

int pnp_is_active(struct pnp_dev *dev);
@@ -476,6 +477,7 @@ static inline int pnp_start_dev(struct pnp_dev *dev) { return -ENODEV; } 
static inline int pnp_stop_dev(struct pnp_dev *dev) { return -ENODEV; }

static inline int pnp_activate_dev(struct pnp_dev *dev) { return -ENODEV; }

static inline int pnp_disable_dev(struct pnp_dev *dev) { return -ENODEV; }

static inline int pnp_range_reserved(resource_size_t start, resource_size_t end) { return 0;}



/* protocol helpers */

static inline int pnp_is_active(struct pnp_dev *dev) { return 0; }