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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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fbfb144553
Check the return value of device_register() in platform_bus_init(). Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
646 lines
17 KiB
C
646 lines
17 KiB
C
/*
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* platform.c - platform 'pseudo' bus for legacy devices
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*
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* Copyright (c) 2002-3 Patrick Mochel
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* Copyright (c) 2002-3 Open Source Development Labs
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*
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* This file is released under the GPLv2
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*
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* Please see Documentation/driver-model/platform.txt for more
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* information.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/bootmem.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include "base.h"
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#define to_platform_driver(drv) (container_of((drv), struct platform_driver, driver))
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struct device platform_bus = {
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.bus_id = "platform",
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};
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EXPORT_SYMBOL_GPL(platform_bus);
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/**
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* platform_get_resource - get a resource for a device
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* @dev: platform device
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* @type: resource type
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* @num: resource index
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*/
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struct resource *
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platform_get_resource(struct platform_device *dev, unsigned int type,
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unsigned int num)
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{
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int i;
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for (i = 0; i < dev->num_resources; i++) {
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struct resource *r = &dev->resource[i];
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if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
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IORESOURCE_IRQ|IORESOURCE_DMA))
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== type)
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if (num-- == 0)
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return r;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(platform_get_resource);
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/**
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* platform_get_irq - get an IRQ for a device
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* @dev: platform device
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* @num: IRQ number index
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*/
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int platform_get_irq(struct platform_device *dev, unsigned int num)
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{
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struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
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return r ? r->start : -ENXIO;
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}
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EXPORT_SYMBOL_GPL(platform_get_irq);
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/**
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* platform_get_resource_byname - get a resource for a device by name
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* @dev: platform device
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* @type: resource type
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* @name: resource name
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*/
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struct resource *
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platform_get_resource_byname(struct platform_device *dev, unsigned int type,
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char *name)
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{
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int i;
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for (i = 0; i < dev->num_resources; i++) {
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struct resource *r = &dev->resource[i];
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if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
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IORESOURCE_IRQ|IORESOURCE_DMA)) == type)
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if (!strcmp(r->name, name))
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return r;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(platform_get_resource_byname);
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/**
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* platform_get_irq - get an IRQ for a device
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* @dev: platform device
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* @name: IRQ name
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*/
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int platform_get_irq_byname(struct platform_device *dev, char *name)
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{
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struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
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return r ? r->start : -ENXIO;
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}
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EXPORT_SYMBOL_GPL(platform_get_irq_byname);
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/**
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* platform_add_devices - add a numbers of platform devices
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* @devs: array of platform devices to add
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* @num: number of platform devices in array
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*/
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int platform_add_devices(struct platform_device **devs, int num)
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{
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int i, ret = 0;
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for (i = 0; i < num; i++) {
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ret = platform_device_register(devs[i]);
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if (ret) {
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while (--i >= 0)
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platform_device_unregister(devs[i]);
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break;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(platform_add_devices);
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struct platform_object {
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struct platform_device pdev;
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char name[1];
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};
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/**
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* platform_device_put
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* @pdev: platform device to free
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*
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* Free all memory associated with a platform device. This function
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* must _only_ be externally called in error cases. All other usage
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* is a bug.
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*/
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void platform_device_put(struct platform_device *pdev)
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{
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if (pdev)
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put_device(&pdev->dev);
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}
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EXPORT_SYMBOL_GPL(platform_device_put);
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static void platform_device_release(struct device *dev)
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{
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struct platform_object *pa = container_of(dev, struct platform_object, pdev.dev);
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kfree(pa->pdev.dev.platform_data);
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kfree(pa->pdev.resource);
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kfree(pa);
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}
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/**
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* platform_device_alloc
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* @name: base name of the device we're adding
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* @id: instance id
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*
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* Create a platform device object which can have other objects attached
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* to it, and which will have attached objects freed when it is released.
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*/
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struct platform_device *platform_device_alloc(const char *name, unsigned int id)
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{
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struct platform_object *pa;
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pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL);
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if (pa) {
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strcpy(pa->name, name);
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pa->pdev.name = pa->name;
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pa->pdev.id = id;
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device_initialize(&pa->pdev.dev);
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pa->pdev.dev.release = platform_device_release;
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}
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return pa ? &pa->pdev : NULL;
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}
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EXPORT_SYMBOL_GPL(platform_device_alloc);
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/**
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* platform_device_add_resources
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @res: set of resources that needs to be allocated for the device
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* @num: number of resources
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*
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* Add a copy of the resources to the platform device. The memory
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* associated with the resources will be freed when the platform
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* device is released.
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*/
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int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num)
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{
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struct resource *r;
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r = kmalloc(sizeof(struct resource) * num, GFP_KERNEL);
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if (r) {
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memcpy(r, res, sizeof(struct resource) * num);
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pdev->resource = r;
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pdev->num_resources = num;
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}
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return r ? 0 : -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_resources);
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/**
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* platform_device_add_data
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* @pdev: platform device allocated by platform_device_alloc to add resources to
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* @data: platform specific data for this platform device
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* @size: size of platform specific data
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*
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* Add a copy of platform specific data to the platform device's platform_data
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* pointer. The memory associated with the platform data will be freed
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* when the platform device is released.
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*/
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int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size)
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{
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void *d;
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d = kmalloc(size, GFP_KERNEL);
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if (d) {
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memcpy(d, data, size);
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pdev->dev.platform_data = d;
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}
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return d ? 0 : -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(platform_device_add_data);
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/**
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* platform_device_add - add a platform device to device hierarchy
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* @pdev: platform device we're adding
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*
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* This is part 2 of platform_device_register(), though may be called
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* separately _iff_ pdev was allocated by platform_device_alloc().
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*/
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int platform_device_add(struct platform_device *pdev)
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{
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int i, ret = 0;
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if (!pdev)
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return -EINVAL;
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if (!pdev->dev.parent)
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pdev->dev.parent = &platform_bus;
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pdev->dev.bus = &platform_bus_type;
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if (pdev->id != -1)
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snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev->name, pdev->id);
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else
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strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);
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for (i = 0; i < pdev->num_resources; i++) {
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struct resource *p, *r = &pdev->resource[i];
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if (r->name == NULL)
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r->name = pdev->dev.bus_id;
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p = r->parent;
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if (!p) {
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if (r->flags & IORESOURCE_MEM)
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p = &iomem_resource;
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else if (r->flags & IORESOURCE_IO)
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p = &ioport_resource;
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}
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if (p && insert_resource(p, r)) {
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printk(KERN_ERR
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"%s: failed to claim resource %d\n",
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pdev->dev.bus_id, i);
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ret = -EBUSY;
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goto failed;
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}
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}
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pr_debug("Registering platform device '%s'. Parent at %s\n",
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pdev->dev.bus_id, pdev->dev.parent->bus_id);
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ret = device_add(&pdev->dev);
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if (ret == 0)
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return ret;
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failed:
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while (--i >= 0)
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if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))
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release_resource(&pdev->resource[i]);
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return ret;
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}
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EXPORT_SYMBOL_GPL(platform_device_add);
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/**
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* platform_device_del - remove a platform-level device
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* @pdev: platform device we're removing
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*
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* Note that this function will also release all memory- and port-based
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* resources owned by the device (@dev->resource).
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*/
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void platform_device_del(struct platform_device *pdev)
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{
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int i;
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if (pdev) {
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for (i = 0; i < pdev->num_resources; i++) {
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struct resource *r = &pdev->resource[i];
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if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
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release_resource(r);
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}
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device_del(&pdev->dev);
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}
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}
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EXPORT_SYMBOL_GPL(platform_device_del);
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/**
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* platform_device_register - add a platform-level device
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* @pdev: platform device we're adding
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*
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*/
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int platform_device_register(struct platform_device * pdev)
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{
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device_initialize(&pdev->dev);
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return platform_device_add(pdev);
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}
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EXPORT_SYMBOL_GPL(platform_device_register);
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/**
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* platform_device_unregister - unregister a platform-level device
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* @pdev: platform device we're unregistering
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*
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* Unregistration is done in 2 steps. First we release all resources
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* and remove it from the subsystem, then we drop reference count by
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* calling platform_device_put().
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*/
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void platform_device_unregister(struct platform_device * pdev)
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{
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platform_device_del(pdev);
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platform_device_put(pdev);
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}
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EXPORT_SYMBOL_GPL(platform_device_unregister);
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/**
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* platform_device_register_simple
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* @name: base name of the device we're adding
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* @id: instance id
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* @res: set of resources that needs to be allocated for the device
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* @num: number of resources
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*
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* This function creates a simple platform device that requires minimal
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* resource and memory management. Canned release function freeing
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* memory allocated for the device allows drivers using such devices
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* to be unloaded iwithout waiting for the last reference to the device
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* to be dropped.
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*/
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struct platform_device *platform_device_register_simple(char *name, unsigned int id,
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struct resource *res, unsigned int num)
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{
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struct platform_device *pdev;
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int retval;
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pdev = platform_device_alloc(name, id);
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if (!pdev) {
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retval = -ENOMEM;
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goto error;
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}
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if (num) {
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retval = platform_device_add_resources(pdev, res, num);
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if (retval)
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goto error;
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}
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retval = platform_device_add(pdev);
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if (retval)
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goto error;
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return pdev;
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error:
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platform_device_put(pdev);
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return ERR_PTR(retval);
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}
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EXPORT_SYMBOL_GPL(platform_device_register_simple);
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static int platform_drv_probe(struct device *_dev)
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{
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struct platform_driver *drv = to_platform_driver(_dev->driver);
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struct platform_device *dev = to_platform_device(_dev);
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return drv->probe(dev);
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}
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static int platform_drv_probe_fail(struct device *_dev)
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{
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return -ENXIO;
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}
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static int platform_drv_remove(struct device *_dev)
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{
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struct platform_driver *drv = to_platform_driver(_dev->driver);
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struct platform_device *dev = to_platform_device(_dev);
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return drv->remove(dev);
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}
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static void platform_drv_shutdown(struct device *_dev)
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{
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struct platform_driver *drv = to_platform_driver(_dev->driver);
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struct platform_device *dev = to_platform_device(_dev);
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drv->shutdown(dev);
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}
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static int platform_drv_suspend(struct device *_dev, pm_message_t state)
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{
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struct platform_driver *drv = to_platform_driver(_dev->driver);
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struct platform_device *dev = to_platform_device(_dev);
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return drv->suspend(dev, state);
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}
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static int platform_drv_resume(struct device *_dev)
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{
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struct platform_driver *drv = to_platform_driver(_dev->driver);
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struct platform_device *dev = to_platform_device(_dev);
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return drv->resume(dev);
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}
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/**
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* platform_driver_register
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* @drv: platform driver structure
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*/
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int platform_driver_register(struct platform_driver *drv)
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{
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drv->driver.bus = &platform_bus_type;
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if (drv->probe)
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drv->driver.probe = platform_drv_probe;
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if (drv->remove)
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drv->driver.remove = platform_drv_remove;
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if (drv->shutdown)
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drv->driver.shutdown = platform_drv_shutdown;
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if (drv->suspend)
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drv->driver.suspend = platform_drv_suspend;
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if (drv->resume)
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drv->driver.resume = platform_drv_resume;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(platform_driver_register);
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/**
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* platform_driver_unregister
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* @drv: platform driver structure
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*/
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void platform_driver_unregister(struct platform_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(platform_driver_unregister);
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/**
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* platform_driver_probe - register driver for non-hotpluggable device
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* @drv: platform driver structure
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* @probe: the driver probe routine, probably from an __init section
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*
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* Use this instead of platform_driver_register() when you know the device
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* is not hotpluggable and has already been registered, and you want to
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* remove its run-once probe() infrastructure from memory after the driver
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* has bound to the device.
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*
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* One typical use for this would be with drivers for controllers integrated
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* into system-on-chip processors, where the controller devices have been
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* configured as part of board setup.
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*
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* Returns zero if the driver registered and bound to a device, else returns
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* a negative error code and with the driver not registered.
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*/
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int __init_or_module platform_driver_probe(struct platform_driver *drv,
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int (*probe)(struct platform_device *))
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{
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int retval, code;
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/* temporary section violation during probe() */
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drv->probe = probe;
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retval = code = platform_driver_register(drv);
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/* Fixup that section violation, being paranoid about code scanning
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* the list of drivers in order to probe new devices. Check to see
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* if the probe was successful, and make sure any forced probes of
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* new devices fail.
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*/
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spin_lock(&platform_bus_type.klist_drivers.k_lock);
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drv->probe = NULL;
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if (code == 0 && list_empty(&drv->driver.klist_devices.k_list))
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retval = -ENODEV;
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drv->driver.probe = platform_drv_probe_fail;
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spin_unlock(&platform_bus_type.klist_drivers.k_lock);
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if (code != retval)
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platform_driver_unregister(drv);
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return retval;
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}
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EXPORT_SYMBOL_GPL(platform_driver_probe);
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/* modalias support enables more hands-off userspace setup:
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* (a) environment variable lets new-style hotplug events work once system is
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* fully running: "modprobe $MODALIAS"
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* (b) sysfs attribute lets new-style coldplug recover from hotplug events
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* mishandled before system is fully running: "modprobe $(cat modalias)"
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*/
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static ssize_t
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modalias_show(struct device *dev, struct device_attribute *a, char *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->name);
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return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
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}
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static struct device_attribute platform_dev_attrs[] = {
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__ATTR_RO(modalias),
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__ATTR_NULL,
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};
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static int platform_uevent(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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struct platform_device *pdev = to_platform_device(dev);
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envp[0] = buffer;
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snprintf(buffer, buffer_size, "MODALIAS=%s", pdev->name);
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return 0;
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}
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/**
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* platform_match - bind platform device to platform driver.
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* @dev: device.
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* @drv: driver.
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*
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* Platform device IDs are assumed to be encoded like this:
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* "<name><instance>", where <name> is a short description of the
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* type of device, like "pci" or "floppy", and <instance> is the
|
|
* enumerated instance of the device, like '0' or '42'.
|
|
* Driver IDs are simply "<name>".
|
|
* So, extract the <name> from the platform_device structure,
|
|
* and compare it against the name of the driver. Return whether
|
|
* they match or not.
|
|
*/
|
|
|
|
static int platform_match(struct device * dev, struct device_driver * drv)
|
|
{
|
|
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
|
|
|
|
return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);
|
|
}
|
|
|
|
static int platform_suspend(struct device *dev, pm_message_t mesg)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (dev->driver && dev->driver->suspend)
|
|
ret = dev->driver->suspend(dev, mesg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_suspend_late(struct device *dev, pm_message_t mesg)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && drv->suspend_late)
|
|
ret = drv->suspend_late(pdev, mesg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_resume_early(struct device *dev)
|
|
{
|
|
struct platform_driver *drv = to_platform_driver(dev->driver);
|
|
struct platform_device *pdev = container_of(dev, struct platform_device, dev);
|
|
int ret = 0;
|
|
|
|
if (dev->driver && drv->resume_early)
|
|
ret = drv->resume_early(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int platform_resume(struct device * dev)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (dev->driver && dev->driver->resume)
|
|
ret = dev->driver->resume(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct bus_type platform_bus_type = {
|
|
.name = "platform",
|
|
.dev_attrs = platform_dev_attrs,
|
|
.match = platform_match,
|
|
.uevent = platform_uevent,
|
|
.suspend = platform_suspend,
|
|
.suspend_late = platform_suspend_late,
|
|
.resume_early = platform_resume_early,
|
|
.resume = platform_resume,
|
|
};
|
|
EXPORT_SYMBOL_GPL(platform_bus_type);
|
|
|
|
int __init platform_bus_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = device_register(&platform_bus);
|
|
if (error)
|
|
return error;
|
|
error = bus_register(&platform_bus_type);
|
|
if (error)
|
|
device_unregister(&platform_bus);
|
|
return error;
|
|
}
|
|
|
|
#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
|
|
u64 dma_get_required_mask(struct device *dev)
|
|
{
|
|
u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
|
|
u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
|
|
u64 mask;
|
|
|
|
if (!high_totalram) {
|
|
/* convert to mask just covering totalram */
|
|
low_totalram = (1 << (fls(low_totalram) - 1));
|
|
low_totalram += low_totalram - 1;
|
|
mask = low_totalram;
|
|
} else {
|
|
high_totalram = (1 << (fls(high_totalram) - 1));
|
|
high_totalram += high_totalram - 1;
|
|
mask = (((u64)high_totalram) << 32) + 0xffffffff;
|
|
}
|
|
return mask & *dev->dma_mask;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_get_required_mask);
|
|
#endif
|