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 inline char *link_typetostr(int type)
  11 {
  12         switch (type) {
  13         case ACL_LINK:
  14                 return "ACL";
  15         case SCO_LINK:
  16                 return "SCO";
  17         case ESCO_LINK:
  18                 return "eSCO";
  19         case LE_LINK:
  20                 return "LE";
  21         default:
  22                 return "UNKNOWN";
  23         }
  24 }
  25
  26 static ssize_t show_link_type(struct device *dev,
  27                               struct device_attribute *attr, char *buf)
  28 {
  29         struct hci_conn *conn = to_hci_conn(dev);
  30         return sprintf(buf, "%s\n", link_typetostr(conn->type));
  31 }
  32
  33 static ssize_t show_link_address(struct device *dev,
  34                                  struct device_attribute *attr, char *buf)
  35 {
  36         struct hci_conn *conn = to_hci_conn(dev);
  37         return sprintf(buf, "%pMR\n", &conn->dst);
  38 }
  39
  40 #define LINK_ATTR(_name, _mode, _show, _store) \
  41 struct device_attribute link_attr_##_name = __ATTR(_name, _mode, _show, _store)
  42
  43 static LINK_ATTR(type, S_IRUGO, show_link_type, NULL);
  44 static LINK_ATTR(address, S_IRUGO, show_link_address, NULL);
  45
  46 static struct attribute *bt_link_attrs[] = {
  47         &link_attr_type.attr,
  48         &link_attr_address.attr,
  49         NULL
  50 };
  51
  52 ATTRIBUTE_GROUPS(bt_link);
  53
  54 static void bt_link_release(struct device *dev)
  55 {
  56         struct hci_conn *conn = to_hci_conn(dev);
  57         kfree(conn);
  58 }
  59
  60 static struct device_type bt_link = {
  61         .name    = "link",
  62         .groups  = bt_link_groups,
  63         .release = bt_link_release,
  64 };
  65
  66 /*
  67  * The rfcomm tty device will possibly retain even when conn
  68  * is down, and sysfs doesn't support move zombie device,
  69  * so we should move the device before conn device is destroyed.
  70  */
  71 static int __match_tty(struct device *dev, void *data)
  72 {
  73         return !strncmp(dev_name(dev), "rfcomm", 6);
  74 }
  75
  76 void hci_conn_init_sysfs(struct hci_conn *conn)
  77 {
  78         struct hci_dev *hdev = conn->hdev;
  79
  80         BT_DBG("conn %p", conn);
  81
  82         conn->dev.type = &bt_link;
  83         conn->dev.class = bt_class;
  84         conn->dev.parent = &hdev->dev;
  85
  86         device_initialize(&conn->dev);
  87 }
  88
  89 void hci_conn_add_sysfs(struct hci_conn *conn)
  90 {
  91         struct hci_dev *hdev = conn->hdev;
  92
  93         BT_DBG("conn %p", conn);
  94
  95         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
  96
  97         if (device_add(&conn->dev) < 0) {
  98                 BT_ERR("Failed to register connection device");
  99                 return;
 100         }
 101
 102         hci_dev_hold(hdev);
 103 }
 104
 105 void hci_conn_del_sysfs(struct hci_conn *conn)
 106 {
 107         struct hci_dev *hdev = conn->hdev;
 108
 109         if (!device_is_registered(&conn->dev))
 110                 return;
 111
 112         while (1) {
 113                 struct device *dev;
 114
 115                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 116                 if (!dev)
 117                         break;
 118                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 119                 put_device(dev);
 120         }
 121
 122         device_del(&conn->dev);
 123
 124         hci_dev_put(hdev);
 125 }
 126
 127 static inline char *host_typetostr(int type)
 128 {
 129         switch (type) {
 130         case HCI_BREDR:
 131                 return "BR/EDR";
 132         case HCI_AMP:
 133                 return "AMP";
 134         default:
 135                 return "UNKNOWN";
 136         }
 137 }
 138
 139 static ssize_t show_type(struct device *dev,
 140                          struct device_attribute *attr, char *buf)
 141 {
 142         struct hci_dev *hdev = to_hci_dev(dev);
 143         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 144 }
 145
 146 static ssize_t show_name(struct device *dev,
 147                          struct device_attribute *attr, char *buf)
 148 {
 149         struct hci_dev *hdev = to_hci_dev(dev);
 150         char name[HCI_MAX_NAME_LENGTH + 1];
 151         int i;
 152
 153         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 154                 name[i] = hdev->dev_name[i];
 155
 156         name[HCI_MAX_NAME_LENGTH] = '\0';
 157         return sprintf(buf, "%s\n", name);
 158 }
 159
 160 static ssize_t show_address(struct device *dev,
 161                             struct device_attribute *attr, char *buf)
 162 {
 163         struct hci_dev *hdev = to_hci_dev(dev);
 164         return sprintf(buf, "%pMR\n", &hdev->bdaddr);
 165 }
 166
 167 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 168 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 169 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 170
 171 static struct attribute *bt_host_attrs[] = {
 172         &dev_attr_type.attr,
 173         &dev_attr_name.attr,
 174         &dev_attr_address.attr,
 175         NULL
 176 };
 177
 178 ATTRIBUTE_GROUPS(bt_host);
 179
 180 static void bt_host_release(struct device *dev)
 181 {
 182         struct hci_dev *hdev = to_hci_dev(dev);
 183         kfree(hdev);
 184         module_put(THIS_MODULE);
 185 }
 186
 187 static struct device_type bt_host = {
 188         .name    = "host",
 189         .groups  = bt_host_groups,
 190         .release = bt_host_release,
 191 };
 192
 193 void hci_init_sysfs(struct hci_dev *hdev)
 194 {
 195         struct device *dev = &hdev->dev;
 196
 197         dev->type = &bt_host;
 198         dev->class = bt_class;
 199
 200         __module_get(THIS_MODULE);
 201         device_initialize(dev);
 202 }
 203
 204 int __init bt_sysfs_init(void)
 205 {
 206         bt_class = class_create(THIS_MODULE, "bluetooth");
 207
 208         return PTR_ERR_OR_ZERO(bt_class);
 209 }
 210
 211 void bt_sysfs_cleanup(void)
 212 {
 213         class_destroy(bt_class);
 214 }