drivers/nfc/st-nci/core.c

Source file repositories/reference/linux-study-clean/drivers/nfc/st-nci/core.c

File Facts

System
Linux kernel
Corpus path
drivers/nfc/st-nci/core.c
Extension
.c
Size
3858 bytes
Lines
176
Domain
Driver Families
Bucket
drivers/nfc
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// 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),

Annotation

Implementation Notes