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 static struct attribute_group bt_link_group = {
  53         .attrs = bt_link_attrs,
  54 };
  55
  56 static const struct attribute_group *bt_link_groups[] = {
  57         &bt_link_group,
  58         NULL
  59 };
  60
  61 static void bt_link_release(struct device *dev)
  62 {
  63         struct hci_conn *conn = to_hci_conn(dev);
  64         kfree(conn);
  65 }
  66
  67 static struct device_type bt_link = {
  68         .name    = "link",
  69         .groups  = bt_link_groups,
  70         .release = bt_link_release,
  71 };
  72
  73 /*
  74  * The rfcomm tty device will possibly retain even when conn
  75  * is down, and sysfs doesn't support move zombie device,
  76  * so we should move the device before conn device is destroyed.
  77  */
  78 static int __match_tty(struct device *dev, void *data)
  79 {
  80         return !strncmp(dev_name(dev), "rfcomm", 6);
  81 }
  82
  83 void hci_conn_init_sysfs(struct hci_conn *conn)
  84 {
  85         struct hci_dev *hdev = conn->hdev;
  86
  87         BT_DBG("conn %p", conn);
  88
  89         conn->dev.type = &bt_link;
  90         conn->dev.class = bt_class;
  91         conn->dev.parent = &hdev->dev;
  92
  93         device_initialize(&conn->dev);
  94 }
  95
  96 void hci_conn_add_sysfs(struct hci_conn *conn)
  97 {
  98         struct hci_dev *hdev = conn->hdev;
  99
 100         BT_DBG("conn %p", conn);
 101
 102         dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);
 103
 104         if (device_add(&conn->dev) < 0) {
 105                 BT_ERR("Failed to register connection device");
 106                 return;
 107         }
 108
 109         hci_dev_hold(hdev);
 110 }
 111
 112 void hci_conn_del_sysfs(struct hci_conn *conn)
 113 {
 114         struct hci_dev *hdev = conn->hdev;
 115
 116         if (!device_is_registered(&conn->dev))
 117                 return;
 118
 119         while (1) {
 120                 struct device *dev;
 121
 122                 dev = device_find_child(&conn->dev, NULL, __match_tty);
 123                 if (!dev)
 124                         break;
 125                 device_move(dev, NULL, DPM_ORDER_DEV_LAST);
 126                 put_device(dev);
 127         }
 128
 129         device_del(&conn->dev);
 130
 131         hci_dev_put(hdev);
 132 }
 133
 134 static inline char *host_typetostr(int type)
 135 {
 136         switch (type) {
 137         case HCI_BREDR:
 138                 return "BR/EDR";
 139         case HCI_AMP:
 140                 return "AMP";
 141         default:
 142                 return "UNKNOWN";
 143         }
 144 }
 145
 146 static ssize_t show_type(struct device *dev,
 147                          struct device_attribute *attr, char *buf)
 148 {
 149         struct hci_dev *hdev = to_hci_dev(dev);
 150         return sprintf(buf, "%s\n", host_typetostr(hdev->dev_type));
 151 }
 152
 153 static ssize_t show_name(struct device *dev,
 154                          struct device_attribute *attr, char *buf)
 155 {
 156         struct hci_dev *hdev = to_hci_dev(dev);
 157         char name[HCI_MAX_NAME_LENGTH + 1];
 158         int i;
 159
 160         for (i = 0; i < HCI_MAX_NAME_LENGTH; i++)
 161                 name[i] = hdev->dev_name[i];
 162
 163         name[HCI_MAX_NAME_LENGTH] = '\0';
 164         return sprintf(buf, "%s\n", name);
 165 }
 166
 167 static ssize_t show_address(struct device *dev,
 168                             struct device_attribute *attr, char *buf)
 169 {
 170         struct hci_dev *hdev = to_hci_dev(dev);
 171         return sprintf(buf, "%pMR\n", &hdev->bdaddr);
 172 }
 173
 174 static DEVICE_ATTR(type, S_IRUGO, show_type, NULL);
 175 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 176 static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
 177
 178 static struct attribute *bt_host_attrs[] = {
 179         &dev_attr_type.attr,
 180         &dev_attr_name.attr,
 181         &dev_attr_address.attr,
 182         NULL
 183 };
 184
 185 static struct attribute_group bt_host_group = {
 186         .attrs = bt_host_attrs,
 187 };
 188
 189 static const struct attribute_group *bt_host_groups[] = {
 190         &bt_host_group,
 191         NULL
 192 };
 193
 194 static void bt_host_release(struct device *dev)
 195 {
 196         struct hci_dev *hdev = to_hci_dev(dev);
 197         kfree(hdev);
 198         module_put(THIS_MODULE);
 199 }
 200
 201 static struct device_type bt_host = {
 202         .name    = "host",
 203         .groups  = bt_host_groups,
 204         .release = bt_host_release,
 205 };
 206
 207 void hci_init_sysfs(struct hci_dev *hdev)
 208 {
 209         struct device *dev = &hdev->dev;
 210
 211         dev->type = &bt_host;
 212         dev->class = bt_class;
 213
 214         __module_get(THIS_MODULE);
 215         device_initialize(dev);
 216 }
 217
 218 int __init bt_sysfs_init(void)
 219 {
 220         bt_class = class_create(THIS_MODULE, "bluetooth");
 221
 222         return PTR_ERR_OR_ZERO(bt_class);
 223 }
 224
 225 void bt_sysfs_cleanup(void)
 226 {
 227         class_destroy(bt_class);
 228 }