// SPDX-License-Identifier: GPL-2.0-only
/*
 * nop (passthrough) Link Layer Control
 *
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 */

#include <linux/types.h>

#include "llc.h"

struct llc_nop {
        struct nfc_hci_dev *hdev;
        xmit_to_drv_t xmit_to_drv;
        rcv_to_hci_t rcv_to_hci;
        int tx_headroom;
        int tx_tailroom;
        llc_failure_t llc_failure;
};

static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
                          rcv_to_hci_t rcv_to_hci, int tx_headroom,
                          int tx_tailroom, int *rx_headroom, int *rx_tailroom,
                          llc_failure_t llc_failure)
{
        struct llc_nop *llc_nop;

        *rx_headroom = 0;
        *rx_tailroom = 0;

        llc_nop = kzalloc_obj(struct llc_nop);
        if (llc_nop == NULL)
                return NULL;

        llc_nop->hdev = hdev;
        llc_nop->xmit_to_drv = xmit_to_drv;
        llc_nop->rcv_to_hci = rcv_to_hci;
        llc_nop->tx_headroom = tx_headroom;
        llc_nop->tx_tailroom = tx_tailroom;
        llc_nop->llc_failure = llc_failure;

        return llc_nop;
}

static void llc_nop_deinit(struct nfc_llc *llc)
{
        kfree(nfc_llc_get_data(llc));
}

static int llc_nop_start(struct nfc_llc *llc)
{
        return 0;
}

static int llc_nop_stop(struct nfc_llc *llc)
{
        return 0;
}

static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
{
        struct llc_nop *llc_nop = nfc_llc_get_data(llc);

        llc_nop->rcv_to_hci(llc_nop->hdev, skb);
}

static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
{
        struct llc_nop *llc_nop = nfc_llc_get_data(llc);

        return llc_nop->xmit_to_drv(llc_nop->hdev, skb);
}

static const struct nfc_llc_ops llc_nop_ops = {
        .init = llc_nop_init,
        .deinit = llc_nop_deinit,
        .start = llc_nop_start,
        .stop = llc_nop_stop,
        .rcv_from_drv = llc_nop_rcv_from_drv,
        .xmit_from_hci = llc_nop_xmit_from_hci,
};

int nfc_llc_nop_register(void)
{
        return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
}