core.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * NCI based Driver for STMicroelectronics NFC Chip
  4 *
  5 * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/nfc.h>
 10#include <net/nfc/nci.h>
 11#include <net/nfc/nci_core.h>
 12
 13#include "st-nci.h"
 14
 15#define DRIVER_DESC "NCI NFC driver for ST_NCI"
 16
 17#define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
 18
 19static int st_nci_init(struct nci_dev *ndev)
 20{
 21	struct nci_mode_set_cmd cmd;
 22
 23	cmd.cmd_type = ST_NCI_SET_NFC_MODE;
 24	cmd.mode = 1;
 25
 26	return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
 27			sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
 28}
 29
 30static int st_nci_open(struct nci_dev *ndev)
 31{
 32	struct st_nci_info *info = nci_get_drvdata(ndev);
 33	int r;
 34
 35	if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
 36		return 0;
 37
 38	r = ndlc_open(info->ndlc);
 39	if (r)
 40		clear_bit(ST_NCI_RUNNING, &info->flags);
 41
 42	return r;
 43}
 44
 45static int st_nci_close(struct nci_dev *ndev)
 46{
 47	struct st_nci_info *info = nci_get_drvdata(ndev);
 48
 49	if (!test_bit(ST_NCI_RUNNING, &info->flags))
 50		return 0;
 51
 52	ndlc_close(info->ndlc);
 53
 54	clear_bit(ST_NCI_RUNNING, &info->flags);
 55
 56	return 0;
 57}
 58
 59static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 60{
 61	struct st_nci_info *info = nci_get_drvdata(ndev);
 62
 63	skb->dev = (void *)ndev;
 64
 65	if (!test_bit(ST_NCI_RUNNING, &info->flags))
 66		return -EBUSY;
 67
 68	return ndlc_send(info->ndlc, skb);
 69}
 70
 71static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
 72					 __u8 rf_protocol)
 73{
 74	return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
 75		NFC_PROTO_ISO15693_MASK : 0;
 76}
 77
 78static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
 79					struct sk_buff *skb)
 80{
 81	__u8 status = skb->data[0];
 82
 83	nci_req_complete(ndev, status);
 84	return 0;
 85}
 86
 87static const struct nci_driver_ops st_nci_prop_ops[] = {
 88	{
 89		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 90					  ST_NCI_CORE_PROP),
 91		.rsp = st_nci_prop_rsp_packet,
 92	},
 93};
 94
 95static const struct nci_ops st_nci_ops = {
 96	.init = st_nci_init,
 97	.open = st_nci_open,
 98	.close = st_nci_close,
 99	.send = st_nci_send,
100	.get_rfprotocol = st_nci_get_rfprotocol,
101	.discover_se = st_nci_discover_se,
102	.enable_se = st_nci_enable_se,
103	.disable_se = st_nci_disable_se,
104	.se_io = st_nci_se_io,
105	.hci_load_session = st_nci_hci_load_session,
106	.hci_event_received = st_nci_hci_event_received,
107	.hci_cmd_received = st_nci_hci_cmd_received,
108	.prop_ops = st_nci_prop_ops,
109	.n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
110};
111
112int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
113		 int phy_tailroom, struct st_nci_se_status *se_status)
114{
115	struct st_nci_info *info;
116	int r;
117	u32 protocols;
118
119	info = devm_kzalloc(ndlc->dev,
120			sizeof(struct st_nci_info), GFP_KERNEL);
121	if (!info)
122		return -ENOMEM;
123
124	protocols = NFC_PROTO_JEWEL_MASK
125		| NFC_PROTO_MIFARE_MASK
126		| NFC_PROTO_FELICA_MASK
127		| NFC_PROTO_ISO14443_MASK
128		| NFC_PROTO_ISO14443_B_MASK
129		| NFC_PROTO_ISO15693_MASK
130		| NFC_PROTO_NFC_DEP_MASK;
131
132	BUILD_BUG_ON(ARRAY_SIZE(st_nci_prop_ops) > NCI_MAX_PROPRIETARY_CMD);
133	ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
134					phy_headroom, phy_tailroom);
135	if (!ndlc->ndev) {
136		pr_err("Cannot allocate nfc ndev\n");
137		return -ENOMEM;
138	}
139	info->ndlc = ndlc;
140
141	nci_set_drvdata(ndlc->ndev, info);
142
143	r = st_nci_vendor_cmds_init(ndlc->ndev);
144	if (r) {
145		pr_err("Cannot register proprietary vendor cmds\n");
146		goto err_reg_dev;
147	}
148
149	r = nci_register_device(ndlc->ndev);
150	if (r) {
151		pr_err("Cannot register nfc device to nci core\n");
152		goto err_reg_dev;
153	}
154
155	return st_nci_se_init(ndlc->ndev, se_status);
156
157err_reg_dev:
158	nci_free_device(ndlc->ndev);
159	return r;
160}
161EXPORT_SYMBOL_GPL(st_nci_probe);
162
163void st_nci_remove(struct nci_dev *ndev)
164{
165	struct st_nci_info *info = nci_get_drvdata(ndev);
166
167	ndlc_close(info->ndlc);
168
169	nci_unregister_device(ndev);
170	nci_free_device(ndev);
171}
172EXPORT_SYMBOL_GPL(st_nci_remove);
173
174MODULE_LICENSE("GPL");
175MODULE_DESCRIPTION(DRIVER_DESC);