linux/drivers/uwb/umc-dev.c
Thomas Gleixner adf77481fb treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 254
Based on 1 normalized pattern(s):

  this file is released under the gnu gpl v2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141332.816211035@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:27 +02:00

95 lines
2.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* UWB Multi-interface Controller device management.
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*/
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/uwb/umc.h>
static void umc_device_release(struct device *dev)
{
struct umc_dev *umc = to_umc_dev(dev);
kfree(umc);
}
/**
* umc_device_create - allocate a child UMC device
* @parent: parent of the new UMC device.
* @n: index of the new device.
*
* The new UMC device will have a bus ID of the parent with '-n'
* appended.
*/
struct umc_dev *umc_device_create(struct device *parent, int n)
{
struct umc_dev *umc;
umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
if (umc) {
dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
umc->dev.parent = parent;
umc->dev.bus = &umc_bus_type;
umc->dev.release = umc_device_release;
umc->dev.dma_mask = parent->dma_mask;
}
return umc;
}
EXPORT_SYMBOL_GPL(umc_device_create);
/**
* umc_device_register - register a UMC device
* @umc: pointer to the UMC device
*
* The memory resource for the UMC device is acquired and the device
* registered with the system.
*/
int umc_device_register(struct umc_dev *umc)
{
int err;
err = request_resource(umc->resource.parent, &umc->resource);
if (err < 0) {
dev_err(&umc->dev, "can't allocate resource range %pR: %d\n",
&umc->resource, err);
goto error_request_resource;
}
err = device_register(&umc->dev);
if (err < 0)
goto error_device_register;
return 0;
error_device_register:
put_device(&umc->dev);
release_resource(&umc->resource);
error_request_resource:
return err;
}
EXPORT_SYMBOL_GPL(umc_device_register);
/**
* umc_device_unregister - unregister a UMC device
* @umc: pointer to the UMC device
*
* First we unregister the device, make sure the driver can do it's
* resource release thing and then we try to release any left over
* resources. We take a ref to the device, to make sure it doesn't
* disappear under our feet.
*/
void umc_device_unregister(struct umc_dev *umc)
{
struct device *dev;
if (!umc)
return;
dev = get_device(&umc->dev);
device_unregister(&umc->dev);
release_resource(&umc->resource);
put_device(dev);
}
EXPORT_SYMBOL_GPL(umc_device_unregister);