PNP: add pnp_get_resource() interface

This adds a pnp_get_resource() that works the same way as
platform_get_resource().  This will enable us to consolidate
many pnp_resource_table references in one place, which will
make it easier to make the table dynamic.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-By: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index eee6d8eddcb4..ef8835ec5778 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -487,6 +487,33 @@ int pnp_check_dma(struct pnp_dev *dev, int idx)
 #endif
 }
 
+struct resource *pnp_get_resource(struct pnp_dev *dev,
+                                  unsigned int type, unsigned int num)
+{
+        struct pnp_resource_table *res = &dev->res;
+
+        switch (type) {
+        case IORESOURCE_IO:
+                if (num >= PNP_MAX_PORT)
+                        return NULL;
+                return &res->port_resource[num];
+        case IORESOURCE_MEM:
+                if (num >= PNP_MAX_MEM)
+                        return NULL;
+                return &res->mem_resource[num];
+        case IORESOURCE_IRQ:
+                if (num >= PNP_MAX_IRQ)
+                        return NULL;
+                return &res->irq_resource[num];
+        case IORESOURCE_DMA:
+                if (num >= PNP_MAX_DMA)
+                        return NULL;
+                return &res->dma_resource[num];
+        }
+        return NULL;
+}
+EXPORT_SYMBOL(pnp_get_resource);
+
 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 static int __init pnp_setup_reserve_irq(char *str)
 {
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index e8187d9faf01..b5fd03854fa4 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -25,6 +25,7 @@ struct pnp_dev;
 /*
  * Resource Management
  */
+struct resource *pnp_get_resource(struct pnp_dev *, unsigned int, unsigned int);
 
 /* Use these instead of directly reading pnp_dev to get resource information */
 #define pnp_port_start(dev,bar)   ((dev)->res.port_resource[(bar)].start)