/*
 *  The NFC Controller Interface is the communication protocol between an
 *  NFC Controller (NFCC) and a Device Host (DH).
 *
 *  Copyright (C) 2011 Texas Instruments, Inc.
 *
 *  Written by Ilan Elias <ilane@ti.com>
 *
 *  Acknowledgements:
 *  This file is based on hci_event.c, which was written
 *  by Maxim Krasnyansky.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>

#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>

/* Handle NCI Response packets */

static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
        struct nci_core_reset_rsp *rsp = (void *) skb->data;

        pr_debug("status 0x%x\n", rsp->status);

        if (rsp->status == NCI_STATUS_OK) {
                ndev->nci_ver = rsp->nci_ver;
                pr_debug("nci_ver 0x%x, config_status 0x%x\n",
                         rsp->nci_ver, rsp->config_status);
        }

        nci_req_complete(ndev, rsp->status);
}

static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
        struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
        struct nci_core_init_rsp_2 *rsp_2;

        pr_debug("status 0x%x\n", rsp_1->status);

        if (rsp_1->status != NCI_STATUS_OK)
                goto exit;

        ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
        ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;

        if (ndev->num_supported_rf_interfaces >
            NCI_MAX_SUPPORTED_RF_INTERFACES) {
                ndev->num_supported_rf_interfaces =
                        NCI_MAX_SUPPORTED_RF_INTERFACES;
        }

        memcpy(ndev->supported_rf_interfaces,
               rsp_1->supported_rf_interfaces,
               ndev->num_supported_rf_interfaces);

        rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);

        ndev->max_logical_connections = rsp_2->max_logical_connections;
        ndev->max_routing_table_size =
                __le16_to_cpu(rsp_2->max_routing_table_size);
        ndev->max_ctrl_pkt_payload_len =
                rsp_2->max_ctrl_pkt_payload_len;
        ndev->max_size_for_large_params =
                __le16_to_cpu(rsp_2->max_size_for_large_params);
        ndev->manufact_id =
                rsp_2->manufact_id;
        ndev->manufact_specific_info =
                __le32_to_cpu(rsp_2->manufact_specific_info);

        pr_debug("nfcc_features 0x%x\n",
                 ndev->nfcc_features);
        pr_debug("num_supported_rf_interfaces %d\n",
                 ndev->num_supported_rf_interfaces);
        pr_debug("supported_rf_interfaces[0] 0x%x\n",
                 ndev->supported_rf_interfaces[0]);
        pr_debug("supported_rf_interfaces[1] 0x%x\n",
                 ndev->supported_rf_interfaces[1]);
        pr_debug("supported_rf_interfaces[2] 0x%x\n",
                 ndev->supported_rf_interfaces[2]);
        pr_debug("supported_rf_interfaces[3] 0x%x\n",
                 ndev->supported_rf_interfaces[3]);
        pr_debug("max_logical_connections %d\n",
                 ndev->max_logical_connections);
        pr_debug("max_routing_table_size %d\n",
                 ndev->max_routing_table_size);
        pr_debug("max_ctrl_pkt_payload_len %d\n",
                 ndev->max_ctrl_pkt_payload_len);
        pr_debug("max_size_for_large_params %d\n",
                 ndev->max_size_for_large_params);
        pr_debug("manufact_id 0x%x\n",
                 ndev->manufact_id);
        pr_debug("manufact_specific_info 0x%x\n",
                 ndev->manufact_specific_info);

exit:
        nci_req_complete(ndev, rsp_1->status);
}

static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
                                           struct sk_buff *skb)
{
        struct nci_core_set_config_rsp *rsp = (void *) skb->data;

        pr_debug("status 0x%x\n", rsp->status);

        nci_req_complete(ndev, rsp->status);
}

static void nci_rf_disc_map_rsp_packet(struct nci_dev *ndev,
                                       struct sk_buff *skb)
{
        __u8 status = skb->data[0];

        pr_debug("status 0x%x\n", status);

        nci_req_complete(ndev, status);
}

static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
        __u8 status = skb->data[0];

        pr_debug("status 0x%x\n", status);

        if (status == NCI_STATUS_OK)
                atomic_set(&ndev->state, NCI_DISCOVERY);

        nci_req_complete(ndev, status);
}

static void nci_rf_disc_select_rsp_packet(struct nci_dev *ndev,
                                          struct sk_buff *skb)
{
        __u8 status = skb->data[0];

        pr_debug("status 0x%x\n", status);

        /* Complete the request on intf_activated_ntf or generic_error_ntf */
        if (status != NCI_STATUS_OK)
                nci_req_complete(ndev, status);
}

static void nci_rf_deactivate_rsp_packet(struct nci_dev *ndev,
                                         struct sk_buff *skb)
{
        __u8 status = skb->data[0];

        pr_debug("status 0x%x\n", status);

        /* If target was active, complete the request only in deactivate_ntf */
        if ((status != NCI_STATUS_OK) ||
            (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
                nci_clear_target_list(ndev);
                atomic_set(&ndev->state, NCI_IDLE);
                nci_req_complete(ndev, status);
        }
}

void nci_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
        __u16 rsp_opcode = nci_opcode(skb->data);

        /* we got a rsp, stop the cmd timer */
        del_timer(&ndev->cmd_timer);

        pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
                 nci_pbf(skb->data),
                 nci_opcode_gid(rsp_opcode),
                 nci_opcode_oid(rsp_opcode),
                 nci_plen(skb->data));

        /* strip the nci control header */
        skb_pull(skb, NCI_CTRL_HDR_SIZE);

        switch (rsp_opcode) {
        case NCI_OP_CORE_RESET_RSP:
                nci_core_reset_rsp_packet(ndev, skb);
                break;

        case NCI_OP_CORE_INIT_RSP:
                nci_core_init_rsp_packet(ndev, skb);
                break;

        case NCI_OP_CORE_SET_CONFIG_RSP:
                nci_core_set_config_rsp_packet(ndev, skb);
                break;

        case NCI_OP_RF_DISCOVER_MAP_RSP:
                nci_rf_disc_map_rsp_packet(ndev, skb);
                break;

        case NCI_OP_RF_DISCOVER_RSP:
                nci_rf_disc_rsp_packet(ndev, skb);
                break;

        case NCI_OP_RF_DISCOVER_SELECT_RSP:
                nci_rf_disc_select_rsp_packet(ndev, skb);
                break;

        case NCI_OP_RF_DEACTIVATE_RSP:
                nci_rf_deactivate_rsp_packet(ndev, skb);
                break;

        default:
                pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
                break;
        }

        kfree_skb(skb);

        /* trigger the next cmd */
        atomic_set(&ndev->cmd_cnt, 1);
        if (!skb_queue_empty(&ndev->cmd_q))
                queue_work(ndev->cmd_wq, &ndev->cmd_work);
}