net/bluetooth/hci_sysfs.c

   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 const struct class bt_class = {
  10         .name = "bluetooth",
  11 };
  12
  13 static void bt_link_release(struct device *dev)
  14 {
  15         struct hci_conn *conn = to_hci_conn(dev);
  16         kfree(conn);
  17 }
  18
  19 static 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  */
  29 static int __match_tty(struct device *dev, void *data)
  30 {
  31         return !strncmp(dev_name(dev), "rfcomm", 6);
  32 }
  33
  34 void 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
  47 void 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
  62 void 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
  89 static 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
 100 static const struct device_type bt_host = {
 101         .name    = "host",
 102         .release = bt_host_release,
 103 };
 104
 105 void 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
 116 int __init bt_sysfs_init(void)
 117 {
 118         return class_register(&bt_class);
 119 }
 120
 121 void bt_sysfs_cleanup(void)
 122 {
 123         class_unregister(&bt_class);
 124 }