net/bluetooth/hci_sysfs.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Bluetooth HCI driver model support. */
0003
0004 #include <linux/module.h>
0005
0006 #include <net/bluetooth/bluetooth.h>
0007 #include <net/bluetooth/hci_core.h>
0008
0009 static struct class *bt_class;
0010
0011 static void bt_link_release(struct device *dev)
0012 {
0013     struct hci_conn *conn = to_hci_conn(dev);
0014     kfree(conn);
0015 }
0016
0017 static const struct device_type bt_link = {
0018     .name    = "link",
0019     .release = bt_link_release,
0020 };
0021
0022 /*
0023  * The rfcomm tty device will possibly retain even when conn
0024  * is down, and sysfs doesn't support move zombie device,
0025  * so we should move the device before conn device is destroyed.
0026  */
0027 static int __match_tty(struct device *dev, void *data)
0028 {
0029     return !strncmp(dev_name(dev), "rfcomm", 6);
0030 }
0031
0032 void hci_conn_init_sysfs(struct hci_conn *conn)
0033 {
0034     struct hci_dev *hdev = conn->hdev;
0035
0036     BT_DBG("conn %p", conn);
0037
0038     conn->dev.type = &bt_link;
0039     conn->dev.class = bt_class;
0040     conn->dev.parent = &hdev->dev;
0041
0042     device_initialize(&conn->dev);
0043 }
0044
0045 void hci_conn_add_sysfs(struct hci_conn *conn)
0046 {
0047     struct hci_dev *hdev = conn->hdev;
0048
0049     BT_DBG("conn %p", conn);
0050
0051     dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
0052
0053     if (device_add(&conn->dev) < 0) {
0054         bt_dev_err(hdev, "failed to register connection device");
0055         return;
0056     }
0057
0058     hci_dev_hold(hdev);
0059 }
0060
0061 void hci_conn_del_sysfs(struct hci_conn *conn)
0062 {
0063     struct hci_dev *hdev = conn->hdev;
0064
0065     if (!device_is_registered(&conn->dev))
0066         return;
0067
0068     while (1) {
0069         struct device *dev;
0070
0071         dev = device_find_child(&conn->dev, NULL, __match_tty);
0072         if (!dev)
0073             break;
0074         device_move(dev, NULL, DPM_ORDER_DEV_LAST);
0075         put_device(dev);
0076     }
0077
0078     device_del(&conn->dev);
0079
0080     hci_dev_put(hdev);
0081 }
0082
0083 static void bt_host_release(struct device *dev)
0084 {
0085     struct hci_dev *hdev = to_hci_dev(dev);
0086
0087     if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
0088         hci_release_dev(hdev);
0089     else
0090         kfree(hdev);
0091     module_put(THIS_MODULE);
0092 }
0093
0094 static const struct device_type bt_host = {
0095     .name    = "host",
0096     .release = bt_host_release,
0097 };
0098
0099 void hci_init_sysfs(struct hci_dev *hdev)
0100 {
0101     struct device *dev = &hdev->dev;
0102
0103     dev->type = &bt_host;
0104     dev->class = bt_class;
0105
0106     __module_get(THIS_MODULE);
0107     device_initialize(dev);
0108 }
0109
0110 int __init bt_sysfs_init(void)
0111 {
0112     bt_class = class_create(THIS_MODULE, "bluetooth");
0113
0114     return PTR_ERR_OR_ZERO(bt_class);
0115 }
0116
0117 void bt_sysfs_cleanup(void)
0118 {
0119     class_destroy(bt_class);
0120 }