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
bt_link_release(struct device * dev)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 */
__match_tty(struct device * dev,void * data)27 static int __match_tty(struct device *dev, void *data)
28 {
29 return !strncmp(dev_name(dev), "rfcomm", 6);
30 }
31
hci_conn_init_sysfs(struct hci_conn * conn)32 void 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
hci_conn_add_sysfs(struct hci_conn * conn)45 void 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
hci_conn_del_sysfs(struct hci_conn * conn)60 void 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
bt_host_release(struct device * dev)87 static 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_release_dev(hdev);
93 else
94 kfree(hdev);
95 module_put(THIS_MODULE);
96 }
97
98 static const struct device_type bt_host = {
99 .name = "host",
100 .release = bt_host_release,
101 };
102
hci_init_sysfs(struct hci_dev * hdev)103 void hci_init_sysfs(struct hci_dev *hdev)
104 {
105 struct device *dev = &hdev->dev;
106
107 dev->type = &bt_host;
108 dev->class = bt_class;
109
110 __module_get(THIS_MODULE);
111 device_initialize(dev);
112 }
113
bt_sysfs_init(void)114 int __init bt_sysfs_init(void)
115 {
116 bt_class = class_create(THIS_MODULE, "bluetooth");
117
118 return PTR_ERR_OR_ZERO(bt_class);
119 }
120
bt_sysfs_cleanup(void)121 void bt_sysfs_cleanup(void)
122 {
123 class_destroy(bt_class);
124 }
125