/*
* platform.c - platform 'pseudo' bus for legacy devices
*
* Copyright (c) 2002-3 Patrick Mochel
* Copyright (c) 2002-3 Open Source Development Labs
*
* This file is released under the GPLv2
*
* Please see Documentation/driver-model/platform.txt for more
* information.
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
#include "base.h"
#define to_platform_driver(drv) (container_of((drv), struct platform_driver, \
driver))
struct device platform_bus = {
.init_name = "platform",
};
EXPORT_SYMBOL_GPL(platform_bus);
/**
* 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 (type == resource_type(r) && num-- == 0)
return r;
}
return NULL;
}
EXPORT_SYMBOL_GPL(platform_get_resource);
/**
* 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 : -ENXIO;
}
EXPORT_SYMBOL_GPL(platform_get_irq);
/**
* platform_get_resource_byname - get a resource for a device by name
* @dev: platform device
* @type: resource type
* @name: resource name
*/
struct resource *platform_get_resource_byname(struct platform_device *dev,
unsigned int type, char *name)
{
int i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *r = &dev->resource[i];
if (type == resource_type(r) && !strcmp(r->name, name))
return r;
}
return NULL;
}
EXPORT_SYMBOL_GPL(platform_get_resource_byname);
/**
* platform_get_irq - get an IRQ for a device
* @dev: platform device
* @name: IRQ name
*/
int platform_get_irq_byname(struct platform_device *dev, char *name)
{
struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ,
name);
return r ? r->start : -ENXIO;
}
EXPORT_SYMBOL_GPL(platform_get_irq_byname);
/**
* 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, ret = 0;
for (i = 0; i < num; i++) {
ret = platform_device_register(devs[i]);
if (ret) {
while (--i >= 0)
platform_device_unregister(devs[i]);
break;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(platform_add_devices);
struct platform_object {
struct platform_device pdev;
char name[1];
};
/**
* platform_device_put
* @pdev: platform device to free
*
* Free all memory associated with a platform device. This function must
* _only_ be externally called in error cases. All other usage is a bug.
*/
void platform_device_put(struct platform_device *pdev)
{
if (pdev)
put_device(&pdev->dev);
}
EXPORT_SYMBOL_GPL(platform_device_put);
static void platform_device_release(struct device *dev)
{
struct platform_object *pa = container_of(dev, struct platform_object,
pdev.dev);
kfree(pa->pdev.dev.platform_data);
kfree(pa->pdev.resource);
kfree(pa);
}
/**
* platform_device_alloc
* @name: base name of the device we're adding
* @id: instance id
*
* Create a platform device object which can have other objects attached
* to it, and which will have attached objects freed when it is released.
*/
struct platform_device *platform_device_alloc(const char *name, int id)
{
struct platform_object *pa;
pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
if (pa) {
strcpy(pa->name, name);
pa->pdev.name = pa->name;
pa->pdev.id = id;
device_initialize(&pa->pdev.dev);
pa->pdev.