path: root/net/nfc/nci/ntf.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  The NFC Controller Interface is the communication protocol between an
 *  NFC Controller (NFCC) and a Device Host (DH).
 *
 *  Copyright (C) 2014 Marvell International Ltd.
 *  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.
 */

#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>
#include <linux/nfc.h>

/* Handle NCI Notification packets */

static int nci_core_reset_ntf_packet(struct nci_dev *ndev,
				     const struct sk_buff *skb)
{
	/* Handle NCI 2.x core reset notification */
	const struct nci_core_reset_ntf *ntf;

	if (skb->len < sizeof(struct nci_core_reset_ntf))
		return -EINVAL;

	ntf = (struct nci_core_reset_ntf *)skb->data;

	ndev->nci_ver = ntf->nci_ver;
	pr_debug("nci_ver 0x%x, config_status 0x%x\n",
		 ntf->nci_ver, ntf->config_status);

	ndev->manufact_id = ntf->manufact_id;
	ndev->manufact_specific_info =
		__le32_to_cpu(ntf->manufact_specific_info);

	nci_req_complete(ndev, NCI_STATUS_OK);

	return 0;
}

static int nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
					    struct sk_buff *skb)
{
	struct nci_core_conn_credit_ntf *ntf;
	struct nci_conn_info *conn_info;
	int i;

	if (skb->len < sizeof(struct nci_core_conn_credit_ntf))
		return -EINVAL;

	ntf = (struct nci_core_conn_credit_ntf *)skb->data;

	pr_debug("num_entries %d\n", ntf->num_entries);

	if (ntf->num_entries > NCI_MAX_NUM_CONN)
		ntf->num_entries = NCI_MAX_NUM_CONN;

	/* update the credits */
	for (i = 0; i < ntf->num_entries; i++) {
		ntf->conn_entries[i].conn_id =
			nci_conn_id(&ntf->conn_entries[i].conn_id);

		pr_debug("entry[%d]: conn_id %d, credits %d\n",
			 i, ntf->conn_entries[i].conn_id,
			 ntf->conn_entries[i].credits);

		conn_info = nci_get_conn_info_by_conn_id(ndev,
							 ntf->conn_entries[i].conn_id);
		if (!conn_info)
			return 0;

		atomic_add(ntf->conn_entries[i].credits,
			   &conn_info->credits_cnt);
	}

	/* trigger the next tx */
	if (!skb_queue_empty(&ndev->tx_q))
		queue_work(ndev->tx_wq, &ndev->tx_work);

	return 0;
}

static int nci_core_generic_error_ntf_packet(struct nci_dev *ndev,
					     const struct sk_buff *skb)
{
	__u8 status;

	if (skb->len < 1)
		return -EINVAL;

	status = skb->data[0];

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

	if (atomic_read(&ndev->state) == NCI_W4_HOST_SELECT) {
		/* Activation failed, so complete the request
		   (the state remains the same) */
		nci_req_complete(ndev, status);
	}

	return 0;
}

static int nci_core_conn_intf_error_ntf_packet(struct nci_dev *ndev,
					       struct sk_buff *skb)
{
	struct nci_core_intf_error_ntf *ntf;

	if (skb->len < sizeof(struct nci_core_intf_error_ntf))
		return -EINVAL;

	ntf = (struct nci_core_intf_error_ntf *)skb->data;

	ntf->conn_id = nci_conn_id(&ntf->conn_id);

	pr_debug("status 0x%x, conn_id %d\n", ntf->status, ntf->conn_id);

	/* complete the data exchange transaction, if exists */
	if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
		nci_data_exchange_complete(ndev, NULL, ntf->conn_id, -EIO);

	return 0;
}

static const __u8 *
nci_extract_rf_params_nfca_passive_poll(struct nci_dev *ndev,
					struct rf_tech_specific_params_nfca_poll *nfca_poll,
					const __u8 *data)
{
	nfca_poll->sens_res = __le16_to_cpu(*((__le16 *)data));
	data += 2;

	nfca_poll->nfcid1_len = min_t(__u8, *data++, NFC_NFCID1_MAXSIZE);

	pr_debug("sens_res 0x%x, nfcid1_len %d\n",
		 nfca_poll->sens_res, nfca_poll->nfcid1_len);

	memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
	data += nfca_poll->nfcid1_len;

	nfca_poll->sel_res_len = *data++;

	if (nfca_poll->sel_res_len != 0)
		nfca_poll->sel_res = *data++;

	pr_debug("sel_res_len %d, sel_res 0x%x\n",
		 nfca_poll->sel_res_len,
		 nfca_poll->sel_res);

	return data;
}

static const __u8 *
nci_extract_rf_params_nfcb_passive_poll(struct nci_dev *ndev,
					struct rf_tech_specific_params_nfcb_poll *nfcb_poll,
					const __u8