rsp.c

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/*
 *  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 <[email protected]>
 *
 *  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);
}