linux-kernel - Re: [patch 28/37] PNP: add pnp_get

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Message-Id: <200803261715.05328.bjorn.helgaas@hp.com>
Date:	Wed, 26 Mar 2008 17:15:03 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Len Brown <lenb@...nel.org>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Adam Belay <ambx1@....rr.com>,
	Li Shaohua <shaohua.li@...el.com>,
	Matthieu Castet <castet.matthieu@...e.fr>,
	Thomas Renninger <trenn@...e.de>,
	Rene Herman <rene.herman@...access.nl>,
	Jaroslav Kysela <perex@...ex.cz>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch 28/37] PNP: add pnp_get_resource() interface

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.

I used EXPORT_SYMBOL, not EXPORT_SYMBOL_GPL, because it doesn't
seem right to break existing non-GPL PNP drivers.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>

---
 drivers/pnp/resource.c |   27 +++++++++++++++++++++++++++
 include/linux/pnp.h    |    1 +
 2 files changed, 28 insertions(+)

Index: work7/include/linux/pnp.h
===================================================================
--- work7.orig/include/linux/pnp.h	2008-03-26 11:10:22.000000000 -0600
+++ work7/include/linux/pnp.h	2008-03-26 16:50:05.000000000 -0600
@@ -25,6 +25,7 @@
 /*
  * 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)
Index: work7/drivers/pnp/resource.c
===================================================================
--- work7.orig/drivers/pnp/resource.c	2008-03-26 11:10:29.000000000 -0600
+++ work7/drivers/pnp/resource.c	2008-03-26 16:50:42.000000000 -0600
@@ -560,6 +560,33 @@
 	return 0;
 }
 
+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)
 {
--
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