PNP: add pnp_new_resource() to find a new unset pnp_resource

This encapsulates the code to locate a new pnp_resource of the
desired type.  Currently this uses the pnp_resource_table, but
it will soon change to find a resource in a linked list.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index c57cfe51d52a..1f4134eea7b7 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -538,6 +538,44 @@ struct resource *pnp_get_resource(struct pnp_dev *dev,
 }
 EXPORT_SYMBOL(pnp_get_resource);
 
+static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev, int type)
+{
+        struct pnp_resource *pnp_res;
+        int i;
+
+        switch (type) {
+        case IORESOURCE_IO:
+                for (i = 0; i < PNP_MAX_PORT; i++) {
+                        pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IO, i);
+                        if (pnp_res && !pnp_resource_valid(&pnp_res->res))
+                                return pnp_res;
+                }
+                break;
+        case IORESOURCE_MEM:
+                for (i = 0; i < PNP_MAX_MEM; i++) {
+                        pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_MEM, i);
+                        if (pnp_res && !pnp_resource_valid(&pnp_res->res))
+                                return pnp_res;
+                }
+                break;
+        case IORESOURCE_IRQ:
+                for (i = 0; i < PNP_MAX_IRQ; i++) {
+                        pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_IRQ, i);
+                        if (pnp_res && !pnp_resource_valid(&pnp_res->res))
+                                return pnp_res;
+                }
+                break;
+        case IORESOURCE_DMA:
+                for (i = 0; i < PNP_MAX_DMA; i++) {
+                        pnp_res = pnp_get_pnp_resource(dev, IORESOURCE_DMA, i);
+                        if (pnp_res && !pnp_resource_valid(&pnp_res->res))
+                                return pnp_res;
+                }
+                break;
+        }
+        return NULL;
+}
+
 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 static int __init pnp_setup_reserve_irq(char *str)
 {