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_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
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_DBG("conn %p", conn);
50
51 dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
52
53 if (device_add(&conn->dev) < 0) {
54 bt_dev_err(hdev, "failed to register connection device");
55 return;
56 }
57
58 hci_dev_hold(hdev);
59 }
60
hci_conn_del_sysfs(struct hci_conn * conn)61 void hci_conn_del_sysfs(struct hci_conn *conn)
62 {
63 struct hci_dev *hdev = conn->hdev;
64
65 if (!device_is_registered(&conn->dev))
66 return;
67
68 while (1) {
69 struct device *dev;
70
71 dev = device_find_child(&conn->dev, NULL, __match_tty);
72 if (!dev)
73 break;
74 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
75 put_device(dev);
76 }
77
78 device_del(&conn->dev);
79
80 hci_dev_put(hdev);
81 }
82
bt_host_release(struct device * dev)83 static void bt_host_release(struct device *dev)
84 {
85 struct hci_dev *hdev = to_hci_dev(dev);
86 kfree(hdev);
87 module_put(THIS_MODULE);
88 }
89
90 static const struct device_type bt_host = {
91 .name = "host",
92 .release = bt_host_release,
93 };
94
hci_init_sysfs(struct hci_dev * hdev)95 void hci_init_sysfs(struct hci_dev *hdev)
96 {
97 struct device *dev = &hdev->dev;
98
99 dev->type = &bt_host;
100 dev->class = bt_class;
101
102 __module_get(THIS_MODULE);
103 device_initialize(dev);
104 }
105
bt_sysfs_init(void)106 int __init bt_sysfs_init(void)
107 {
108 bt_class = class_create(THIS_MODULE, "bluetooth");
109
110 return PTR_ERR_OR_ZERO(bt_class);
111 }
112
bt_sysfs_cleanup(void)113 void bt_sysfs_cleanup(void)
114 {
115 class_destroy(bt_class);
116 }
117