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/export.h>
10#include <linux/slab.h>
11#include <linux/uwb/umc.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		dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
35		umc->dev.parent  = parent;
36		umc->dev.bus     = &umc_bus_type;
37		umc->dev.release = umc_device_release;
38
39		umc->dev.dma_mask = parent->dma_mask;
40	}
41	return umc;
42}
43EXPORT_SYMBOL_GPL(umc_device_create);
44
45/**
46 * umc_device_register - register a UMC device
47 * @umc: pointer to the UMC device
48 *
49 * The memory resource for the UMC device is acquired and the device
50 * registered with the system.
51 */
52int umc_device_register(struct umc_dev *umc)
53{
54	int err;
55
56	err = request_resource(umc->resource.parent, &umc->resource);
57	if (err < 0) {
58		dev_err(&umc->dev, "can't allocate resource range %pR: %d\n",
59			&umc->resource, err);
60		goto error_request_resource;
61	}
62
63	err = device_register(&umc->dev);
64	if (err < 0)
65		goto error_device_register;
66	return 0;
67
68error_device_register:
69	put_device(&umc->dev);
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 * disappear 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