linux/drivers/uwb/umc-dev.c
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   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#define D_LOCAL 0
  11#include <linux/uwb/debug.h>
  12
  13static void umc_device_release(struct device *dev)
  14{
  15        struct umc_dev *umc = to_umc_dev(dev);
  16
  17        kfree(umc);
  18}
  19
  20/**
  21 * umc_device_create - allocate a child UMC device
  22 * @parent: parent of the new UMC device.
  23 * @n:      index of the new device.
  24 *
  25 * The new UMC device will have a bus ID of the parent with '-n'
  26 * appended.
  27 */
  28struct umc_dev *umc_device_create(struct device *parent, int n)
  29{
  30        struct umc_dev *umc;
  31
  32        umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
  33        if (umc) {
  34                snprintf(umc->dev.bus_id, sizeof(umc->dev.bus_id), "%s-%d",
  35                         parent->bus_id, n);
  36                umc->dev.parent  = parent;
  37                umc->dev.bus     = &umc_bus_type;
  38                umc->dev.release = umc_device_release;
  39
  40                umc->dev.dma_mask = parent->dma_mask;
  41        }
  42        return umc;
  43}
  44EXPORT_SYMBOL_GPL(umc_device_create);
  45
  46/**
  47 * umc_device_register - register a UMC device
  48 * @umc: pointer to the UMC device
  49 *
  50 * The memory resource for the UMC device is acquired and the device
  51 * registered with the system.
  52 */
  53int umc_device_register(struct umc_dev *umc)
  54{
  55        int err;
  56
  57        d_fnstart(3, &umc->dev, "(umc_dev %p)\n", umc);
  58
  59        err = request_resource(umc->resource.parent, &umc->resource);
  60        if (err < 0) {
  61                dev_err(&umc->dev, "can't allocate resource range "
  62                        "%016Lx to %016Lx: %d\n",
  63                        (unsigned long long)umc->resource.start,
  64                        (unsigned long long)umc->resource.end,
  65                        err);
  66                goto error_request_resource;
  67        }
  68
  69        err = device_register(&umc->dev);
  70        if (err < 0)
  71                goto error_device_register;
  72        d_fnend(3, &umc->dev, "(umc_dev %p) = 0\n", umc);
  73        return 0;
  74
  75error_device_register:
  76        release_resource(&umc->resource);
  77error_request_resource:
  78        d_fnend(3, &umc->dev, "(umc_dev %p) = %d\n", umc, err);
  79        return err;
  80}
  81EXPORT_SYMBOL_GPL(umc_device_register);
  82
  83/**
  84 * umc_device_unregister - unregister a UMC device
  85 * @umc: pointer to the UMC device
  86 *
  87 * First we unregister the device, make sure the driver can do it's
  88 * resource release thing and then we try to release any left over
  89 * resources. We take a ref to the device, to make sure it doesn't
  90 * dissapear under our feet.
  91 */
  92void umc_device_unregister(struct umc_dev *umc)
  93{
  94        struct device *dev;
  95        if (!umc)
  96                return;
  97        dev = get_device(&umc->dev);
  98        d_fnstart(3, dev, "(umc_dev %p)\n", umc);
  99        device_unregister(&umc->dev);
 100        release_resource(&umc->resource);
 101        d_fnend(3, dev, "(umc_dev %p) = void\n", umc);
 102        put_device(dev);
 103}
 104EXPORT_SYMBOL_GPL(umc_device_unregister);
 105