1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * UWB Multi-interface Controller device management.
4 *
5 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
6 */
7 #include <linux/kernel.h>
8 #include <linux/export.h>
9 #include <linux/slab.h>
10 #include "include/umc.h"
11
umc_device_release(struct device * dev)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 */
umc_device_create(struct device * parent,int n)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 */
umc_device_register(struct umc_dev * umc)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 %pR: %d\n",
58 &umc->resource, err);
59 goto error_request_resource;
60 }
61
62 err = device_register(&umc->dev);
63 if (err < 0)
64 goto error_device_register;
65 return 0;
66
67 error_device_register:
68 put_device(&umc->dev);
69 release_resource(&umc->resource);
70 error_request_resource:
71 return err;
72 }
73 EXPORT_SYMBOL_GPL(umc_device_register);
74
75 /**
76 * umc_device_unregister - unregister a UMC device
77 * @umc: pointer to the UMC device
78 *
79 * First we unregister the device, make sure the driver can do it's
80 * resource release thing and then we try to release any left over
81 * resources. We take a ref to the device, to make sure it doesn't
82 * disappear under our feet.
83 */
umc_device_unregister(struct umc_dev * umc)84 void umc_device_unregister(struct umc_dev *umc)
85 {
86 struct device *dev;
87 if (!umc)
88 return;
89 dev = get_device(&umc->dev);
90 device_unregister(&umc->dev);
91 release_resource(&umc->resource);
92 put_device(dev);
93 }
94 EXPORT_SYMBOL_GPL(umc_device_unregister);
95
