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
11 static 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 */
26 struct 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 }
41 EXPORT_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 */
50 int 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
69 error_device_register:
70 release_resource(&umc->resource);
71 error_request_resource:
72 return err;
73 }
74 EXPORT_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 */
85 void 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 }
95 EXPORT_SYMBOL_GPL(umc_device_unregister);
96
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