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         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  51
  52         if (device_add(&conn->dev) < 0) {
  53                 BT_ERR("Failed to register connection device");
  54                 return;
  55         }
  56
  57         hci_dev_hold(hdev);
  58 }
  59
  60 void hci_conn_del_sysfs(struct hci_conn *conn)
  61 {
  62         struct hci_dev *hdev = conn->hdev;
  63
  64         if (!device_is_registered(&conn->dev))
  65                 return;
  66
  67         while (1) {
  68                 struct device *dev;
  69
  70                 dev = device_find_child(&conn->dev, NULL, __match_tty);
  71                 if (!dev)
  72                         break;
  73                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
  74                 put_device(dev);
  75         }
  76
  77         device_del(&conn->dev);
  78
  79         hci_dev_put(hdev);
  80 }
  81
  82 static void bt_host_release(struct device *dev)
  83 {
  84         struct hci_dev *hdev = to_hci_dev(dev);
  85         kfree(hdev);
  86         module_put(THIS_MODULE);
  87 }
  88
  89 static struct device_type bt_host = {
  90         .name    = "host",
  91         .release = bt_host_release,
  92 };
  93
  94 void hci_init_sysfs(struct hci_dev *hdev)
  95 {
  96         struct device *dev = &hdev->dev;
  97
  98         dev->type = &bt_host;
  99         dev->class = bt_class;
 100
 101         __module_get(THIS_MODULE);
 102         device_initialize(dev);
 103 }
 104
 105 int __init bt_sysfs_init(void)
 106 {
 107         bt_class = class_create(THIS_MODULE, "bluetooth");
 108
 109         return PTR_ERR_OR_ZERO(bt_class);
 110 }
 111
 112 void bt_sysfs_cleanup(void)
 113 {
 114         class_destroy(bt_class);
 115 }