// SPDX-License-Identifier: GPL-2.0-only
/*
 * NCI based Driver for STMicroelectronics NFC Chip
 *
 * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
 */

#include <linux/module.h>
#include <linux/nfc.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>

#include "st-nci.h"

#define DRIVER_DESC "NCI NFC driver for ST_NCI"

#define ST_NCI1_X_PROPRIETARY_ISO15693 0x83

static int st_nci_init(struct nci_dev *ndev)
{
        struct nci_mode_set_cmd cmd;

        cmd.cmd_type = ST_NCI_SET_NFC_MODE;
        cmd.mode = 1;

        return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
                        sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
}

static int st_nci_open(struct nci_dev *ndev)
{
        struct st_nci_info *info = nci_get_drvdata(ndev);
        int r;

        if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
                return 0;

        r = ndlc_open(info->ndlc);
        if (r)
                clear_bit(ST_NCI_RUNNING, &info->flags);

        return r;
}

static int st_nci_close(struct nci_dev *ndev)
{
        struct st_nci_info *info = nci_get_drvdata(ndev);

        if (!test_bit(ST_NCI_RUNNING, &info->flags))
                return 0;

        ndlc_close(info->ndlc);

        clear_bit(ST_NCI_RUNNING, &info->flags);

        return 0;
}

static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
        struct st_nci_info *info = nci_get_drvdata(ndev);

        skb->dev = (void *)ndev;

        if (!test_bit(ST_NCI_RUNNING, &info->flags))
                return -EBUSY;

        return ndlc_send(info->ndlc, skb);
}

static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
                                         __u8 rf_protocol)
{
        return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
                NFC_PROTO_ISO15693_MASK : 0;
}

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

        nci_req_complete(ndev, status);
        return 0;
}

static const struct nci_driver_ops st_nci_prop_ops[] = {
        {
                .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
                                          ST_NCI_CORE_PROP),
                .rsp = st_nci_prop_rsp_packet,
        },
};

static const struct nci_ops st_nci_ops = {
        .init = st_nci_init,
        .open = st_nci_open,
        .close = st_nci_close,
        .send = st_nci_send,
        .get_rfprotocol = st_nci_get_rfprotocol,
        .discover_se = st_nci_discover_se,
        .enable_se = st_nci_enable_se,
        .disable_se = st_nci_disable_se,
        .se_io = st_nci_se_io,
        .hci_load_session = st_nci_hci_load_session,
        .hci_event_received = st_nci_hci_event_received,
        .hci_cmd_received = st_nci_hci_cmd_received,
        .prop_ops = st_nci_prop_ops,
        .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
};

int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
                 int phy_tailroom, struct st_nci_se_status *se_status)
{
        struct st_nci_info *info;
        int r;
        u32 protocols;

        info = devm_kzalloc(ndlc->dev,
                        sizeof(struct st_nci_info), GFP_KERNEL);
        if (!info)
                return -ENOMEM;

        protocols = NFC_PROTO_JEWEL_MASK
                | NFC_PROTO_MIFARE_MASK
                | NFC_PROTO_FELICA_MASK
                | NFC_PROTO_ISO14443_MASK
                | NFC_PROTO_ISO14443_B_MASK
                | NFC_PROTO_ISO15693_MASK
                | NFC_PROTO_NFC_DEP_MASK;

        BUILD_BUG_ON(ARRAY_SIZE(st_nci_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
        ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
                                        phy_headroom, phy_tailroom);
        if (!ndlc->ndev) {
                pr_err("Cannot allocate nfc ndev\n");
                return -ENOMEM;
        }
        info->ndlc = ndlc;

        nci_set_drvdata(ndlc->ndev, info);

        r = st_nci_vendor_cmds_init(ndlc->ndev);
        if (r) {
                pr_err("Cannot register proprietary vendor cmds\n");
                goto err_reg_dev;
        }

        r = nci_register_device(ndlc->ndev);
        if (r) {
                pr_err("Cannot register nfc device to nci core\n");
                goto err_reg_dev;
        }

        return st_nci_se_init(ndlc->ndev, se_status);

err_reg_dev:
        nci_free_device(ndlc->ndev);
        return r;
}
EXPORT_SYMBOL_GPL(st_nci_probe);

void st_nci_remove(struct nci_dev *ndev)
{
        struct st_nci_info *info = nci_get_drvdata(ndev);

        ndlc_close(info->ndlc);

        nci_unregister_device(ndev);
        nci_free_device(ndev);
}
EXPORT_SYMBOL_GPL(st_nci_remove);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);