LXR linux/drivers/uwb/umc-dev.c

   1/*
   2 * UWB Multi-interface Controller device management.
   3 *
   4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   5 *
   6 * This file is released under the GNU GPL v2.
   7 */
   8#include <linux/kernel.h>
   9#include <linux/uwb/umc.h>
  10
  11static void umc_device_release(struct device *dev)
  12{
  13        struct umc_dev *umc = to_umc_dev(dev);
  14
  15        kfree(umc);
  16}
  17
  18/**
  19 * umc_device_create - allocate a child UMC device
  20 * @parent: parent of the new UMC device.
  21 * @n:      index of the new device.
  22 *
  23 * The new UMC device will have a bus ID of the parent with '-n'
  24 * appended.
  25 */
  26struct umc_dev *umc_device_create(struct device *parent, int n)
  27{
  28        struct umc_dev *umc;
  29
  30        umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
  31        if (umc) {
  32                dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
  33                umc->dev.parent  = parent;
  34                umc->dev.bus     = &umc_bus_type;
  35                umc->dev.release = umc_device_release;
  36
  37                umc->dev.dma_mask = parent->dma_mask;
  38        }
  39        return umc;
  40}
  41EXPORT_SYMBOL_GPL(umc_device_create);
  42
  43/**
  44 * umc_device_register - register a UMC device
  45 * @umc: pointer to the UMC device
  46 *
  47 * The memory resource for the UMC device is acquired and the device
  48 * registered with the system.
  49 */
  50int umc_device_register(struct umc_dev *umc)
  51{
  52        int err;
  53
  54        err = request_resource(umc->resource.parent, &umc->resource);
  55        if (err < 0) {
  56                dev_err(&umc->dev, "can't allocate resource range "
  57                        "%016Lx to %016Lx: %d\n",
  58                        (unsigned long long)umc->resource.start,
  59                        (unsigned long long)umc->resource.end,
  60                        err);
  61                goto error_request_resource;
  62        }
  63
  64        err = device_register(&umc->dev);
  65        if (err < 0)
  66                goto error_device_register;
  67        return 0;
  68
  69error_device_register:
  70        release_resource(&umc->resource);
  71error_request_resource:
  72        return err;
  73}
  74EXPORT_SYMBOL_GPL(umc_device_register);
  75
  76/**
  77 * umc_device_unregister - unregister a UMC device
  78 * @umc: pointer to the UMC device
  79 *
  80 * First we unregister the device, make sure the driver can do it's
  81 * resource release thing and then we try to release any left over
  82 * resources. We take a ref to the device, to make sure it doesn't
  83 * dissapear under our feet.
  84 */
  85void umc_device_unregister(struct umc_dev *umc)
  86{
  87        struct device *dev;
  88        if (!umc)
  89                return;
  90        dev = get_device(&umc->dev);
  91        device_unregister(&umc->dev);
  92        release_resource(&umc->resource);
  93        put_device(dev);
  94}
  95EXPORT_SYMBOL_GPL(umc_device_unregister);
  96