GNU Linux-libre 4.14.328-gnu1
[releases.git] / net / bluetooth / hci_sysfs.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Bluetooth HCI driver model support. */
3
4 #include <linux/module.h>
5
6 #include <net/bluetooth/bluetooth.h>
7 #include <net/bluetooth/hci_core.h>
8
9 static struct class *bt_class;
10
11 static void bt_link_release(struct device *dev)
12 {
13         struct hci_conn *conn = to_hci_conn(dev);
14         kfree(conn);
15 }
16
17 static const struct device_type bt_link = {
18         .name    = "link",
19         .release = bt_link_release,
20 };
21
22 /*
23  * The rfcomm tty device will possibly retain even when conn
24  * is down, and sysfs doesn't support move zombie device,
25  * so we should move the device before conn device is destroyed.
26  */
27 static int __match_tty(struct device *dev, void *data)
28 {
29         return !strncmp(dev_name(dev), "rfcomm", 6);
30 }
31
32 void hci_conn_init_sysfs(struct hci_conn *conn)
33 {
34         struct hci_dev *hdev = conn->hdev;
35
36         BT_DBG("conn %p", conn);
37
38         conn->dev.type = &bt_link;
39         conn->dev.class = bt_class;
40         conn->dev.parent = &hdev->dev;
41
42         device_initialize(&conn->dev);
43 }
44
45 void hci_conn_add_sysfs(struct hci_conn *conn)
46 {
47         struct hci_dev *hdev = conn->hdev;
48
49         BT_DBG("conn %p", conn);
50
51         if (device_is_registered(&conn->dev))
52                 return;
53
54         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
55
56         if (device_add(&conn->dev) < 0) {
57                 BT_ERR("Failed to register connection device");
58                 return;
59         }
60
61         hci_dev_hold(hdev);
62 }
63
64 void hci_conn_del_sysfs(struct hci_conn *conn)
65 {
66         struct hci_dev *hdev = conn->hdev;
67
68         if (!device_is_registered(&conn->dev))
69                 return;
70
71         while (1) {
72                 struct device *dev;
73
74                 dev = device_find_child(&conn->dev, NULL, __match_tty);
75                 if (!dev)
76                         break;
77                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
78                 put_device(dev);
79         }
80
81         device_del(&conn->dev);
82
83         hci_dev_put(hdev);
84 }
85
86 static void bt_host_release(struct device *dev)
87 {
88         struct hci_dev *hdev = to_hci_dev(dev);
89
90         if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
91                 hci_cleanup_dev(hdev);
92         kfree(hdev);
93         module_put(THIS_MODULE);
94 }
95
96 static const struct device_type bt_host = {
97         .name    = "host",
98         .release = bt_host_release,
99 };
100
101 void hci_init_sysfs(struct hci_dev *hdev)
102 {
103         struct device *dev = &hdev->dev;
104
105         dev->type = &bt_host;
106         dev->class = bt_class;
107
108         __module_get(THIS_MODULE);
109         device_initialize(dev);
110 }
111
112 int __init bt_sysfs_init(void)
113 {
114         bt_class = class_create(THIS_MODULE, "bluetooth");
115
116         return PTR_ERR_OR_ZERO(bt_class);
117 }
118
119 void bt_sysfs_cleanup(void)
120 {
121         class_destroy(bt_class);
122 }