Commit | Line | Data |
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da389eac DV |
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> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
da389eac | 10 | #include <linux/uwb/umc.h> |
da389eac DV |
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) { | |
ae9eba0e | 33 | dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n); |
da389eac DV |
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 | ||
da389eac DV |
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; | |
da389eac DV |
68 | return 0; |
69 | ||
70 | error_device_register: | |
71 | release_resource(&umc->resource); | |
72 | error_request_resource: | |
da389eac DV |
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); | |
da389eac DV |
92 | device_unregister(&umc->dev); |
93 | release_resource(&umc->resource); | |
da389eac DV |
94 | put_device(dev); |
95 | } | |
96 | EXPORT_SYMBOL_GPL(umc_device_unregister); |