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_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
  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
  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
  83 static void bt_host_release(struct device *dev)
  84 {
  85         struct hci_dev *hdev = to_hci_dev(dev);
  86
  87         if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
  88                 hci_release_dev(hdev);
  89         module_put(THIS_MODULE);
  90 }
  91
  92 static const struct device_type bt_host = {
  93         .name    = "host",
  94         .release = bt_host_release,
  95 };
  96
  97 void hci_init_sysfs(struct hci_dev *hdev)
  98 {
  99         struct device *dev = &hdev->dev;
 100
 101         dev->type = &bt_host;
 102         dev->class = bt_class;
 103
 104         __module_get(THIS_MODULE);
 105         device_initialize(dev);
 106 }
 107
 108 int __init bt_sysfs_init(void)
 109 {
 110         bt_class = class_create(THIS_MODULE, "bluetooth");
 111
 112         return PTR_ERR_OR_ZERO(bt_class);
 113 }
 114
 115 void bt_sysfs_cleanup(void)
 116 {
 117         class_destroy(bt_class);
 118 }