Return-Path: From: Jukka Rissanen To: linux-bluetooth@vger.kernel.org Subject: [PATCH v8 5/5] Bluetooth: Manually enable or disable 6LoWPAN between devices Date: Tue, 10 Dec 2013 17:34:49 +0200 Message-Id: <1386689689-26550-6-git-send-email-jukka.rissanen@linux.intel.com> In-Reply-To: <1386689689-26550-1-git-send-email-jukka.rissanen@linux.intel.com> References: <1386689689-26550-1-git-send-email-jukka.rissanen@linux.intel.com> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: 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 --- net/bluetooth/hci_core.c | 88 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 8b8b5f8..924b87a 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -636,6 +636,92 @@ 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 LIST_HEAD(lowpan_user_enabled); +static DEFINE_RWLOCK(lowpan_enabled_lock); + +struct lowpan_enabled { + __u16 dev_id; + bool enabled; + struct list_head list; +}; + +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; + struct lowpan_enabled *entry = NULL, *tmp; + bool new_value, old_value; + char buf[32]; + size_t buf_size = min(count, (sizeof(buf)-1)); + ssize_t ret; + + BT_DBG("dev %s count %zd", hdev->dev_name, count); + + if (copy_from_user(buf, user_buffer, buf_size)) + return -EFAULT; + + buf[buf_size] = '\0'; + + if (strtobool(buf, &new_value) < 0) + return -EINVAL; + + ret = -ENOENT; + + write_lock(&lowpan_enabled_lock); + list_for_each_entry_safe(entry, tmp, &lowpan_user_enabled, list) { + if (entry->dev_id == hdev->id) { + old_value = entry->enabled; + entry->enabled = new_value; + ret = 0; + break; + } + } + write_unlock(&lowpan_enabled_lock); + + if (ret == 0 && old_value == new_value) + return count; + + if (ret < 0) { + entry = kzalloc(sizeof(*entry), GFP_KERNEL); + if (!entry) + return -ENOMEM; + + entry->dev_id = hdev->id; + entry->enabled = new_value; + + write_lock(&lowpan_enabled_lock); + INIT_LIST_HEAD(&entry->list); + list_add(&entry->list, &lowpan_user_enabled); + write_unlock(&lowpan_enabled_lock); + } + + if (new_value == true) + set_bit(HCI_6LOWPAN_ENABLED, &hdev->dev_flags); + else + clear_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 +1492,8 @@ 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; -- 1.8.3.1