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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
183b9b59 IPG |
2 | /* |
3 | * UWB PAL support. | |
4 | * | |
5 | * Copyright (C) 2008 Cambridge Silicon Radio Ltd. | |
183b9b59 IPG |
6 | */ |
7 | #include <linux/kernel.h> | |
dcc7461e | 8 | #include <linux/debugfs.h> |
183b9b59 | 9 | #include <linux/uwb.h> |
475c0a6b | 10 | #include <linux/export.h> |
183b9b59 IPG |
11 | |
12 | #include "uwb-internal.h" | |
13 | ||
14 | /** | |
15 | * uwb_pal_init - initialize a UWB PAL | |
16 | * @pal: the PAL to initialize | |
17 | */ | |
18 | void uwb_pal_init(struct uwb_pal *pal) | |
19 | { | |
20 | INIT_LIST_HEAD(&pal->node); | |
21 | } | |
22 | EXPORT_SYMBOL_GPL(uwb_pal_init); | |
23 | ||
24 | /** | |
25 | * uwb_pal_register - register a UWB PAL | |
183b9b59 IPG |
26 | * @pal: the PAL |
27 | * | |
28 | * The PAL must be initialized with uwb_pal_init(). | |
29 | */ | |
6fae35f9 | 30 | int uwb_pal_register(struct uwb_pal *pal) |
183b9b59 | 31 | { |
6fae35f9 | 32 | struct uwb_rc *rc = pal->rc; |
b60066c1 DV |
33 | int ret; |
34 | ||
35 | if (pal->device) { | |
a8995751 | 36 | /* create a link to the uwb_rc in the PAL device's directory. */ |
b60066c1 DV |
37 | ret = sysfs_create_link(&pal->device->kobj, |
38 | &rc->uwb_dev.dev.kobj, "uwb_rc"); | |
39 | if (ret < 0) | |
40 | return ret; | |
a8995751 | 41 | /* create a link to the PAL in the UWB device's directory. */ |
b60066c1 DV |
42 | ret = sysfs_create_link(&rc->uwb_dev.dev.kobj, |
43 | &pal->device->kobj, pal->name); | |
44 | if (ret < 0) { | |
45 | sysfs_remove_link(&pal->device->kobj, "uwb_rc"); | |
46 | return ret; | |
47 | } | |
48 | } | |
49 | ||
dcc7461e DV |
50 | pal->debugfs_dir = uwb_dbg_create_pal_dir(pal); |
51 | ||
6fae35f9 | 52 | mutex_lock(&rc->uwb_dev.mutex); |
183b9b59 | 53 | list_add(&pal->node, &rc->pals); |
6fae35f9 | 54 | mutex_unlock(&rc->uwb_dev.mutex); |
183b9b59 IPG |
55 | |
56 | return 0; | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(uwb_pal_register); | |
59 | ||
fbbde074 TP |
60 | static int find_rc(struct device *dev, const void *data) |
61 | { | |
62 | const struct uwb_rc *target_rc = data; | |
63 | struct uwb_rc *rc = dev_get_drvdata(dev); | |
64 | ||
65 | if (rc == NULL) { | |
66 | WARN_ON(1); | |
67 | return 0; | |
68 | } | |
69 | if (rc == target_rc) { | |
70 | if (rc->ready == 0) | |
71 | return 0; | |
72 | else | |
73 | return 1; | |
74 | } | |
75 | return 0; | |
76 | } | |
77 | ||
78 | /** | |
79 | * Given a radio controller descriptor see if it is registered. | |
80 | * | |
81 | * @returns false if the rc does not exist or is quiescing; true otherwise. | |
82 | */ | |
83 | static bool uwb_rc_class_device_exists(struct uwb_rc *target_rc) | |
84 | { | |
85 | struct device *dev; | |
86 | ||
87 | dev = class_find_device(&uwb_rc_class, NULL, target_rc, find_rc); | |
88 | ||
d6124b40 JH |
89 | put_device(dev); |
90 | ||
fbbde074 TP |
91 | return (dev != NULL); |
92 | } | |
93 | ||
183b9b59 | 94 | /** |
fbbde074 | 95 | * uwb_pal_unregister - unregister a UWB PAL |
183b9b59 IPG |
96 | * @pal: the PAL |
97 | */ | |
6fae35f9 | 98 | void uwb_pal_unregister(struct uwb_pal *pal) |
183b9b59 | 99 | { |
6fae35f9 DV |
100 | struct uwb_rc *rc = pal->rc; |
101 | ||
102 | uwb_radio_stop(pal); | |
103 | ||
104 | mutex_lock(&rc->uwb_dev.mutex); | |
183b9b59 | 105 | list_del(&pal->node); |
6fae35f9 | 106 | mutex_unlock(&rc->uwb_dev.mutex); |
b60066c1 | 107 | |
dcc7461e DV |
108 | debugfs_remove(pal->debugfs_dir); |
109 | ||
b60066c1 | 110 | if (pal->device) { |
fbbde074 TP |
111 | /* remove link to the PAL in the UWB device's directory. */ |
112 | if (uwb_rc_class_device_exists(rc)) | |
113 | sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name); | |
114 | ||
115 | /* remove link to uwb_rc in the PAL device's directory. */ | |
b60066c1 DV |
116 | sysfs_remove_link(&pal->device->kobj, "uwb_rc"); |
117 | } | |
183b9b59 IPG |
118 | } |
119 | EXPORT_SYMBOL_GPL(uwb_pal_unregister); | |
120 | ||
121 | /** | |
122 | * uwb_rc_pal_init - initialize the PAL related parts of a radio controller | |
123 | * @rc: the radio controller | |
124 | */ | |
125 | void uwb_rc_pal_init(struct uwb_rc *rc) | |
126 | { | |
183b9b59 IPG |
127 | INIT_LIST_HEAD(&rc->pals); |
128 | } |