net/bluetooth/hci_sysfs.c

   1 /* Bluetooth HCI driver model support. */
   2
   3 #include <linux/module.h>
   4
   5 #include <net/bluetooth/bluetooth.h>
   6 #include <net/bluetooth/hci_core.h>
   7
   8 static struct class *bt_class;
   9
  10 static void bt_link_release(struct device *dev)
  11 {
  12         struct hci_conn *conn = to_hci_conn(dev);
  13         kfree(conn);
  14 }
  15
  16 static struct device_type bt_link = {
  17         .name    = "link",
  18         .release = bt_link_release,
  19 };
  20
  21 /*
  22  * The rfcomm tty device will possibly retain even when conn
  23  * is down, and sysfs doesn't support move zombie device,
  24  * so we should move the device before conn device is destroyed.
  25  */
  26 static int __match_tty(struct device *dev, void *data)
  27 {
  28         return !strncmp(dev_name(dev), "rfcomm", 6);
  29 }
  30
  31 void hci_conn_init_sysfs(struct hci_conn *conn)
  32 {
  33         struct hci_dev *hdev = conn->hdev;
  34
  35         BT_DBG("conn %p", conn);
  36
  37         conn->dev.type = &bt_link;
  38         conn->dev.class = bt_class;
  39         conn->dev.parent = &hdev->dev;
  40
  41         device_initialize(&conn->dev);
  42 }
  43
  44 void hci_conn_add_sysfs(struct hci_conn *conn)
  45 {
  46         struct hci_dev *hdev = conn->hdev;
  47
  48         BT_DBG("conn %p", conn);
  49
  50         if (device_is_registered(&conn->dev))
  51                 return;
  52
  53         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  54
  55         if (device_add(&conn->dev) < 0) {
  56                 BT_ERR("Failed to register connection device");
  57                 return;
  58         }
  59
  60         hci_dev_hold(hdev);
  61 }
  62
  63 void hci_conn_del_sysfs(struct hci_conn *conn)
  64 {
  65         struct hci_dev *hdev = conn->hdev;
  66
  67         if (!device_is_registered(&conn->dev))
  68                 return;
  69
  70         while (1) {
  71                 struct device *dev;
  72
  73                 dev = device_find_child(&conn->dev, NULL, __match_tty);
  74                 if (!dev)
  75                         break;
  76                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
  77                 put_device(dev);
  78         }
  79
  80         device_del(&conn->dev);
  81
  82         hci_dev_put(hdev);
  83 }
  84
  85 static void bt_host_release(struct device *dev)
  86 {
  87         struct hci_dev *hdev = to_hci_dev(dev);
  88
  89         if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
  90                 hci_cleanup_dev(hdev);
  91         kfree(hdev);
  92         module_put(THIS_MODULE);
  93 }
  94
  95 static struct device_type bt_host = {
  96         .name    = "host",
  97         .release = bt_host_release,
  98 };
  99
 100 void hci_init_sysfs(struct hci_dev *hdev)
 101 {
 102         struct device *dev = &hdev->dev;
 103
 104         dev->type = &bt_host;
 105         dev->class = bt_class;
 106
 107         __module_get(THIS_MODULE);
 108         device_initialize(dev);
 109 }
 110
 111 int __init bt_sysfs_init(void)
 112 {
 113         bt_class = class_create(THIS_MODULE, "bluetooth");
 114
 115         return PTR_ERR_OR_ZERO(bt_class);
 116 }
 117
 118 void bt_sysfs_cleanup(void)
 119 {
 120         class_destroy(bt_class);
 121 }