blob: ccd2184e05d245a9521757a170883ed3b5197013 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* UWB Multi-interface Controller device management.
*
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
*
* This file is released under the GNU GPL v2.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/uwb/umc.h>
static void umc_device_release(struct device *dev)
{
struct umc_dev *umc = to_umc_dev(dev);
kfree(umc);
}
/**
* umc_device_create - allocate a child UMC device
* @parent: parent of the new UMC device.
* @n: index of the new device.
*
* The new UMC device will have a bus ID of the parent with '-n'
* appended.
*/
struct umc_dev *umc_device_create(struct device *parent, int n)
{
struct umc_dev *umc;
umc = kzalloc(sizeof(struct umc_dev), GFP_KERNEL);
if (umc) {
dev_set_name(&umc->dev, "%s-%d", dev_name(parent), n);
umc->dev.parent = parent;
umc->dev.bus = &umc_bus_type;
umc->dev.release = umc_device_release;
umc->dev.dma_mask = parent->dma_mask;
}
return umc;
}
EXPORT_SYMBOL_GPL(umc_device_create);
/**
* umc_device_register - register a UMC device
* @umc: pointer to the UMC device
*
* The memory resource for the UMC device is acquired and the device
* registered with the system.
*/
int umc_device_register(struct umc_dev *umc)
{
int err;
err = request_resource(umc->resource.parent, &umc->resource);
if (err < 0) {
dev_err(&umc->dev, "can't allocate resource range %pR: %d\n",
&umc->resource, err);
goto error_request_resource;
}
err = device_register(&umc->dev);
if (err < 0)
goto error_device_register;
return 0;
error_device_register:
release_resource(&umc->resource);
error_request_resource:
return err;
}
EXPORT_SYMBOL_GPL(umc_device_register);
/**
* umc_device_unregister - unregister a UMC device
* @umc: pointer to the UMC device
*
* First we unregister the device, make sure the driver can do it's
* resource release thing and then we try to release any left over
* resources. We take a ref to the device, to make sure it doesn't
* dissapear under our feet.
*/
void umc_device_unregister(struct umc_dev *umc)
{
struct device *dev;
if (!umc)
return;
dev = get_device(&umc->dev);
device_unregister(&umc->dev);
release_resource(&umc->resource);
put_device(dev);
}
EXPORT_SYMBOL_GPL(umc_device_unregister);
|
