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
9static const struct class bt_class = {
10	.name = "bluetooth",
11};
12
13static void bt_link_release(struct device *dev)
14{
15	struct hci_conn *conn = to_hci_conn(dev);
16	kfree(conn);
17}
18
19static 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 */
29static int __match_tty(struct device *dev, void *data)
30{
31	return !strncmp(dev_name(dev), "rfcomm", 6);
32}
33
34void hci_conn_init_sysfs(struct hci_conn *conn)
35{
36	struct hci_dev *hdev = conn->hdev;
37
38	bt_dev_dbg(hdev, "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
47void hci_conn_add_sysfs(struct hci_conn *conn)
48{
49	struct hci_dev *hdev = conn->hdev;
50
51	bt_dev_dbg(hdev, "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}
61
62void hci_conn_del_sysfs(struct hci_conn *conn)
63{
64	struct hci_dev *hdev = conn->hdev;
65
66	bt_dev_dbg(hdev, "conn %p", conn);
67
68	if (!device_is_registered(&conn->dev)) {
69		/* If device_add() has *not* succeeded, use *only* put_device()
70		 * to drop the reference count.
71		 */
72		put_device(&conn->dev);
73		return;
74	}
75
76	while (1) {
77		struct device *dev;
78
79		dev = device_find_child(&conn->dev, NULL, __match_tty);
80		if (!dev)
81			break;
82		device_move(dev, NULL, DPM_ORDER_DEV_LAST);
83		put_device(dev);
84	}
85
86	device_unregister(&conn->dev);
87}
88
89static void bt_host_release(struct device *dev)
90{
91	struct hci_dev *hdev = to_hci_dev(dev);
92
93	if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
94		hci_release_dev(hdev);
95	else
96		kfree(hdev);
97	module_put(THIS_MODULE);
98}
99
100static const struct device_type bt_host = {
101	.name    = "host",
102	.release = bt_host_release,
103};
104
105void hci_init_sysfs(struct hci_dev *hdev)
106{
107	struct device *dev = &hdev->dev;
108
109	dev->type = &bt_host;
110	dev->class = &bt_class;
111
112	__module_get(THIS_MODULE);
113	device_initialize(dev);
114}
115
116int __init bt_sysfs_init(void)
117{
118	return class_register(&bt_class);
119}
120
121void bt_sysfs_cleanup(void)
122{
123	class_unregister(&bt_class);
124}
125