NFC: hci: Add open pipe command handler

void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,

			  struct sk_buff *skb)

{

	int r = 0;

	u8 gate = nfc_hci_pipe2gate(hdev, pipe);

	u8 local_gate, new_pipe;

	u8 gate_opened = 0x00;

	pr_debug("from gate %x pipe %x cmd %x\n", gate, pipe, cmd);

	switch (cmd) {

	case NFC_HCI_ADM_NOTIFY_PIPE_CREATED:

		if (skb->len != 5) {

			r = -EPROTO;

			break;

		}

		local_gate = skb->data[3];

		new_pipe = skb->data[4];

		nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK, NULL, 0);

		/* save the new created pipe and bind with local gate,

		 * the description for skb->data[3] is destination gate id

		 * but since we received this cmd from host controller, we

		 * are the destination and it is our local gate

		 */

		hdev->gate2pipe[local_gate] = new_pipe;

		break;

	case NFC_HCI_ANY_OPEN_PIPE:

		/* if the pipe is already created, we allow remote host to

		 * open it

		 */

		if (gate != 0xff)

			nfc_hci_send_response(hdev, gate, NFC_HCI_ANY_OK,

					      &gate_opened, 1);

		break;

	default:

		pr_info("Discarded unknown cmd %x to gate %x\n", cmd, gate);

		r = -EINVAL;

		break;

	}

	kfree_skb(skb);

}