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SubjectRe: [PATCH] Driver Core patches for 2.6.7
Date
From
ChangeSet 1.1722.89.57, 2004/06/08 16:28:02-07:00, rmk@arm.linux.org.uk

[PATCH] Add platform_get_resource()

This patch adds management of platform device resources to the
device model, allowing drivers to lookup resources, IRQs and DMA
numbers in the platform device resource array. We also add a
couple of functions which allow platform devices and their resources
to be registered.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


drivers/base/platform.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/device.h | 5 ++
2 files changed, 91 insertions(+)


diff -Nru a/drivers/base/platform.c b/drivers/base/platform.c
--- a/drivers/base/platform.c Tue Jun 22 09:47:40 2004
+++ b/drivers/base/platform.c Tue Jun 22 09:47:40 2004
@@ -19,6 +19,90 @@
};

/**
+ * platform_get_resource - get a resource for a device
+ * @dev: platform device
+ * @type: resource type
+ * @num: resource index
+ */
+struct resource *
+platform_get_resource(struct platform_device *dev, unsigned int type,
+ unsigned int num)
+{
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *r = &dev->resource[i];
+
+ if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
+ IORESOURCE_IRQ|IORESOURCE_DMA))
+ == type)
+ if (num-- == 0)
+ return r;
+ }
+ return NULL;
+}
+
+/**
+ * platform_get_irq - get an IRQ for a device
+ * @dev: platform device
+ * @num: IRQ number index
+ */
+int platform_get_irq(struct platform_device *dev, unsigned int num)
+{
+ struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
+
+ return r ? r->start : 0;
+}
+
+/**
+ * platform_add_device - add one platform device
+ * @dev: platform device
+ *
+ * Adds one platform device, claiming the memory resources
+ */
+int platform_add_device(struct platform_device *dev)
+{
+ int i;
+
+ for (i = 0; i < dev->num_resources; i++) {
+ struct resource *p, *r = &dev->resource[i];
+
+ r->name = dev->dev.bus_id;
+
+ p = NULL;
+ if (r->flags & IORESOURCE_MEM)
+ p = &iomem_resource;
+ else if (r->flags & IORESOURCE_IO)
+ p = &ioport_resource;
+
+ if (p && request_resource(p, r)) {
+ printk(KERN_ERR
+ "%s%d: failed to claim resource %d\n",
+ dev->name, dev->id, i);
+ break;
+ }
+ }
+ if (i == dev->num_resources)
+ platform_device_register(dev);
+ return 0;
+}
+
+/**
+ * platform_add_devices - add a numbers of platform devices
+ * @devs: array of platform devices to add
+ * @num: number of platform devices in array
+ */
+int platform_add_devices(struct platform_device **devs, int num)
+{
+ int i;
+
+ for (i = 0; i < num; i++)
+ platform_add_device(devs[i]);
+
+ return 0;
+}
+
+/**
* platform_device_register - add a platform-level device
* @dev: platform device we're adding
*
@@ -114,3 +198,5 @@
EXPORT_SYMBOL(platform_bus_type);
EXPORT_SYMBOL(platform_device_register);
EXPORT_SYMBOL(platform_device_unregister);
+EXPORT_SYMBOL(platform_get_irq);
+EXPORT_SYMBOL(platform_get_resource);
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h Tue Jun 22 09:47:40 2004
+++ b/include/linux/device.h Tue Jun 22 09:47:40 2004
@@ -377,6 +377,11 @@
extern struct bus_type platform_bus_type;
extern struct device platform_bus;

+extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
+extern int platform_get_irq(struct platform_device *, unsigned int);
+extern int platform_add_device(struct platform_device *);
+extern int platform_add_devices(struct platform_device **, int);
+
/* drivers/base/power.c */
extern void device_shutdown(void);

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