forked from mirrors/linux
1ce0fd15be
This is required so that we give up the last reference to the device. Signed-off-by: Levente Kurusa <levex@linux.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
/*
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* UWB Multi-interface Controller device management.
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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*
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* This file is released under the GNU GPL v2.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/uwb/umc.h>
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static void umc_device_release(struct device *dev)
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{
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struct umc_dev *umc = to_umc_dev(dev);
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kfree(umc);
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}
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/**
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* umc_device_create - allocate a child UMC device
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* @parent: parent of the new UMC device.
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* @n: index of the new device.
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*
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* The new UMC device will have a bus ID of the parent with '-n'
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* appended.
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*/
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struct umc_dev *umc_device_create(struct device *parent, int n)
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{
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struct umc_dev *umc;
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umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
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if (umc) {
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dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
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umc->dev.parent = parent;
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umc->dev.bus = &umc_bus_type;
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umc->dev.release = umc_device_release;
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umc->dev.dma_mask = parent->dma_mask;
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}
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return umc;
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}
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EXPORT_SYMBOL_GPL(umc_device_create);
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/**
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* umc_device_register - register a UMC device
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* @umc: pointer to the UMC device
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*
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* The memory resource for the UMC device is acquired and the device
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* registered with the system.
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*/
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int umc_device_register(struct umc_dev *umc)
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{
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int err;
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err = request_resource(umc->resource.parent, &umc->resource);
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if (err < 0) {
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dev_err(&umc->dev, "can't allocate resource range %pR: %d\n",
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&umc->resource, err);
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goto error_request_resource;
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}
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err = device_register(&umc->dev);
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if (err < 0)
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goto error_device_register;
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return 0;
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error_device_register:
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put_device(&umc->dev);
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release_resource(&umc->resource);
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error_request_resource:
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return err;
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}
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EXPORT_SYMBOL_GPL(umc_device_register);
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/**
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* umc_device_unregister - unregister a UMC device
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* @umc: pointer to the UMC device
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*
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* First we unregister the device, make sure the driver can do it's
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* resource release thing and then we try to release any left over
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* resources. We take a ref to the device, to make sure it doesn't
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* disappear under our feet.
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*/
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void umc_device_unregister(struct umc_dev *umc)
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{
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struct device *dev;
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if (!umc)
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return;
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dev = get_device(&umc->dev);
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device_unregister(&umc->dev);
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release_resource(&umc->resource);
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put_device(dev);
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}
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EXPORT_SYMBOL_GPL(umc_device_unregister);
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