alistair23-linux/drivers/nfc/st-nci/core.c

// 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 <linux/gpio.h>
#include <linux/delay.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 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 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;

	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);