From 89863109e3dd562529ffd8a559b0de068d1d8502 Mon Sep 17 00:00:00 2001 From: Jukka Rissanen Date: Wed, 11 Dec 2013 17:05:38 +0200 Subject: [PATCH] Bluetooth: Manually enable or disable 6LoWPAN between devices This is a temporary patch where user can manually enable or disable BT 6LoWPAN functionality between devices. Eventually the connection is established automatically if the devices are advertising suitable capability and this patch can be removed. Before connecting the devices do this echo Y > /sys/kernel/debug/bluetooth/hci0/6lowpan This enables 6LoWPAN support and creates the bt0 interface automatically when devices are finally connected. Rebooting or unloading the bluetooth kernel module will also clear the settings from the kernel. Signed-off-by: Jukka Rissanen Signed-off-by: Johan Hedberg Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_core.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 8b8b5f80dd89..b23d40385f18 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -636,6 +636,49 @@ static int conn_max_interval_get(void *data, u64 *val) DEFINE_SIMPLE_ATTRIBUTE(conn_max_interval_fops, conn_max_interval_get, conn_max_interval_set, "%llu\n"); +static ssize_t lowpan_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + struct hci_dev *hdev = file->private_data; + char buf[3]; + + buf[0] = test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags) ? 'Y' : 'N'; + buf[1] = '\n'; + buf[2] = '\0'; + return simple_read_from_buffer(user_buf, count, ppos, buf, 2); +} + +static ssize_t lowpan_write(struct file *fp, const char __user *user_buffer, + size_t count, loff_t *position) +{ + struct hci_dev *hdev = fp->private_data; + bool enable; + char buf[32]; + size_t buf_size = min(count, (sizeof(buf)-1)); + + if (copy_from_user(buf, user_buffer, buf_size)) + return -EFAULT; + + buf[buf_size] = '\0'; + + if (strtobool(buf, &enable) < 0) + return -EINVAL; + + if (enable == test_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags)) + return -EALREADY; + + change_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags); + + return count; +} + +static const struct file_operations lowpan_debugfs_fops = { + .open = simple_open, + .read = lowpan_read, + .write = lowpan_write, + .llseek = default_llseek, +}; + /* ---- HCI requests ---- */ static void hci_req_sync_complete(struct hci_dev *hdev, u8 result) @@ -1406,6 +1449,8 @@ static int __hci_init(struct hci_dev *hdev) hdev, &conn_min_interval_fops); debugfs_create_file("conn_max_interval", 0644, hdev->debugfs, hdev, &conn_max_interval_fops); + debugfs_create_file("6lowpan", 0644, hdev->debugfs, hdev, + &lowpan_debugfs_fops); } return 0; -- 2.11.0