Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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);