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 struct class *bt_class;
10
11static void bt_link_release(struct device *dev)
12{
13	struct hci_conn *conn = to_hci_conn(dev);
14	kfree(conn);
15}
16
17static 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 */
27static int __match_tty(struct device *dev, void *data)
28{
29	return !strncmp(dev_name(dev), "rfcomm", 6);
30}
31
32void hci_conn_init_sysfs(struct hci_conn *conn)
33{
34	struct hci_dev *hdev = conn->hdev;
35
36	bt_dev_dbg(hdev, "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
45void hci_conn_add_sysfs(struct hci_conn *conn)
46{
47	struct hci_dev *hdev = conn->hdev;
48
49	bt_dev_dbg(hdev, "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_dev_err(hdev, "failed to register connection device");
58}
59
60void hci_conn_del_sysfs(struct hci_conn *conn)
61{
62	struct hci_dev *hdev = conn->hdev;
63
64	bt_dev_dbg(hdev, "conn %p", conn);
65
66	if (!device_is_registered(&conn->dev)) {
67		/* If device_add() has *not* succeeded, use *only* put_device()
68		 * to drop the reference count.
69		 */
70		put_device(&conn->dev);
71		return;
72	}
73
74	while (1) {
75		struct device *dev;
76
77		dev = device_find_child(&conn->dev, NULL, __match_tty);
78		if (!dev)
79			break;
80		device_move(dev, NULL, DPM_ORDER_DEV_LAST);
81		put_device(dev);
82	}
83
84	device_unregister(&conn->dev);
85}
86
87static void bt_host_release(struct device *dev)
88{
89	struct hci_dev *hdev = to_hci_dev(dev);
90
91	if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
92		hci_cleanup_dev(hdev);
93	kfree(hdev);
94	module_put(THIS_MODULE);
95}
96
97static const struct device_type bt_host = {
98	.name    = "host",
99	.release = bt_host_release,
100};
101
102void hci_init_sysfs(struct hci_dev *hdev)
103{
104	struct device *dev = &hdev->dev;
105
106	dev->type = &bt_host;
107	dev->class = bt_class;
108
109	__module_get(THIS_MODULE);
110	device_initialize(dev);
111}
112
113int __init bt_sysfs_init(void)
114{
115	bt_class = class_create(THIS_MODULE, "bluetooth");
116
117	return PTR_ERR_OR_ZERO(bt_class);
118}
119
120void bt_sysfs_cleanup(void)
121{
122	class_destroy(bt_class);
123}
124