pnp: add PNP resource range checking function
Bjorn Helgaas [Fri, 5 Jun 2009 14:37:23 +0000 (14:37 +0000)]
Add a PNP resource range check function, indicating whether a resource
has been assigned to any device.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
[apw@canonical.com: fixed up exports et al]
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/pnp/resource.c
include/linux/pnp.h

index f604061..ba97654 100644 (file)
@@ -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)
 {
index ca3c887..b063c73 100644 (file)
@@ -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; }