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 const struct class bt_class = {
10 .name = "bluetooth",
11 };
12
bt_link_release(struct device * dev)13 static void bt_link_release(struct device *dev)
14 {
15 struct hci_conn *conn = to_hci_conn(dev);
16 kfree(conn);
17 }
18
19 static const struct device_type bt_link = {
20 .name = "link",
21 .release = bt_link_release,
22 };
23
24 /*
25 * The rfcomm tty device will possibly retain even when conn
26 * is down, and sysfs doesn't support move zombie device,
27 * so we should move the device before conn device is destroyed.
28 */
__match_tty(struct device * dev,void * data)29 static int __match_tty(struct device *dev, void *data)
30 {
31 return !strncmp(dev_name(dev), "rfcomm", 6);
32 }
33
hci_conn_init_sysfs(struct hci_conn * conn)34 void hci_conn_init_sysfs(struct hci_conn *conn)
35 {
36 struct hci_dev *hdev = conn->hdev;
37
38 BT_DBG("conn %p", conn);
39
40 conn->dev.type = &bt_link;
41 conn->dev.class = &bt_class;
42 conn->dev.parent = &hdev->dev;
43
44 device_initialize(&conn->dev);
45 }
46
hci_conn_add_sysfs(struct hci_conn * conn)47 void hci_conn_add_sysfs(struct hci_conn *conn)
48 {
49 struct hci_dev *hdev = conn->hdev;
50
51 BT_DBG("conn %p", conn);
52
53 if (device_is_registered(&conn->dev))
54 return;
55
56 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
57
58 if (device_add(&conn->dev) < 0) {
59 bt_dev_err(hdev, "failed to register connection device");
60 return;
61 }
62
63 hci_dev_hold(hdev);
64 }
65
hci_conn_del_sysfs(struct hci_conn * conn)66 void hci_conn_del_sysfs(struct hci_conn *conn)
67 {
68 struct hci_dev *hdev = conn->hdev;
69
70 if (!device_is_registered(&conn->dev))
71 return;
72
73 while (1) {
74 struct device *dev;
75
76 dev = device_find_child(&conn->dev, NULL, __match_tty);
77 if (!dev)
78 break;
79 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
80 put_device(dev);
81 }
82
83 device_del(&conn->dev);
84
85 hci_dev_put(hdev);
86 }
87
bt_host_release(struct device * dev)88 static void bt_host_release(struct device *dev)
89 {
90 struct hci_dev *hdev = to_hci_dev(dev);
91
92 if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
93 hci_release_dev(hdev);
94 else
95 kfree(hdev);
96 module_put(THIS_MODULE);
97 }
98
99 static const struct device_type bt_host = {
100 .name = "host",
101 .release = bt_host_release,
102 };
103
hci_init_sysfs(struct hci_dev * hdev)104 void hci_init_sysfs(struct hci_dev *hdev)
105 {
106 struct device *dev = &hdev->dev;
107
108 dev->type = &bt_host;
109 dev->class = &bt_class;
110
111 __module_get(THIS_MODULE);
112 device_initialize(dev);
113 }
114
bt_sysfs_init(void)115 int __init bt_sysfs_init(void)
116 {
117 return class_register(&bt_class);
118 }
119
bt_sysfs_cleanup(void)120 void bt_sysfs_cleanup(void)
121 {
122 class_unregister(&bt_class);
123 }
124
