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 struct class *bt_class;
  10
  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  */
  27 static int __match_tty(struct device *dev, void *data)
  28 {
  29         return !strncmp(dev_name(dev), "rfcomm", 6);
  30 }
  31
  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
  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
  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
  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
 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
 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
 121 void bt_sysfs_cleanup(void)
 122 {
 123         class_destroy(bt_class);
 124 }