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