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#include <linux/gpio.h>
 13#include <linux/delay.h>
 14
 15#include "st-nci.h"
 16
 17#define DRIVER_DESC "NCI NFC driver for ST_NCI"
 18
 19#define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
 20
 21static int st_nci_init(struct nci_dev *ndev)
 22{
 23	struct nci_mode_set_cmd cmd;
 24
 25	cmd.cmd_type = ST_NCI_SET_NFC_MODE;
 26	cmd.mode = 1;
 27
 28	return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
 29			sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
 30}
 31
 32static int st_nci_open(struct nci_dev *ndev)
 33{
 34	struct st_nci_info *info = nci_get_drvdata(ndev);
 35	int r;
 36
 37	if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
 38		return 0;
 39
 40	r = ndlc_open(info->ndlc);
 41	if (r)
 42		clear_bit(ST_NCI_RUNNING, &info->flags);
 43
 44	return r;
 45}
 46
 47static int st_nci_close(struct nci_dev *ndev)
 48{
 49	struct st_nci_info *info = nci_get_drvdata(ndev);
 50
 51	if (!test_bit(ST_NCI_RUNNING, &info->flags))
 52		return 0;
 53
 54	ndlc_close(info->ndlc);
 55
 56	clear_bit(ST_NCI_RUNNING, &info->flags);
 57
 58	return 0;
 59}
 60
 61static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
 62{
 63	struct st_nci_info *info = nci_get_drvdata(ndev);
 64
 65	skb->dev = (void *)ndev;
 66
 67	if (!test_bit(ST_NCI_RUNNING, &info->flags))
 68		return -EBUSY;
 69
 70	return ndlc_send(info->ndlc, skb);
 71}
 72
 73static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
 74					 __u8 rf_protocol)
 75{
 76	return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
 77		NFC_PROTO_ISO15693_MASK : 0;
 78}
 79
 80static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
 81					struct sk_buff *skb)
 82{
 83	__u8 status = skb->data[0];
 84
 85	nci_req_complete(ndev, status);
 86	return 0;
 87}
 88
 89static struct nci_driver_ops st_nci_prop_ops[] = {
 90	{
 91		.opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
 92					  ST_NCI_CORE_PROP),
 93		.rsp = st_nci_prop_rsp_packet,
 94	},
 95};
 96
 97static struct nci_ops st_nci_ops = {
 98	.init = st_nci_init,
 99	.open = st_nci_open,
100	.close = st_nci_close,
101	.send = st_nci_send,
102	.get_rfprotocol = st_nci_get_rfprotocol,
103	.discover_se = st_nci_discover_se,
104	.enable_se = st_nci_enable_se,
105	.disable_se = st_nci_disable_se,
106	.se_io = st_nci_se_io,
107	.hci_load_session = st_nci_hci_load_session,
108	.hci_event_received = st_nci_hci_event_received,
109	.hci_cmd_received = st_nci_hci_cmd_received,
110	.prop_ops = st_nci_prop_ops,
111	.n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
112};
113
114int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
115		 int phy_tailroom, struct st_nci_se_status *se_status)
116{
117	struct st_nci_info *info;
118	int r;
119	u32 protocols;
120
121	info = devm_kzalloc(ndlc->dev,
122			sizeof(struct st_nci_info), GFP_KERNEL);
123	if (!info)
124		return -ENOMEM;
125
126	protocols = NFC_PROTO_JEWEL_MASK
127		| NFC_PROTO_MIFARE_MASK
128		| NFC_PROTO_FELICA_MASK
129		| NFC_PROTO_ISO14443_MASK
130		| NFC_PROTO_ISO14443_B_MASK
131		| NFC_PROTO_ISO15693_MASK
132		| NFC_PROTO_NFC_DEP_MASK;
133
134	ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
135					phy_headroom, phy_tailroom);
136	if (!ndlc->ndev) {
137		pr_err("Cannot allocate nfc ndev\n");
138		return -ENOMEM;
139	}
140	info->ndlc = ndlc;
141
142	nci_set_drvdata(ndlc->ndev, info);
143
144	r = st_nci_vendor_cmds_init(ndlc->ndev);
145	if (r) {
146		pr_err("Cannot register proprietary vendor cmds\n");
147		goto err_reg_dev;
148	}
149
150	r = nci_register_device(ndlc->ndev);
151	if (r) {
152		pr_err("Cannot register nfc device to nci core\n");
153		goto err_reg_dev;
154	}
155
156	return st_nci_se_init(ndlc->ndev, se_status);
157
158err_reg_dev:
159	nci_free_device(ndlc->ndev);
160	return r;
161}
162EXPORT_SYMBOL_GPL(st_nci_probe);
163
164void st_nci_remove(struct nci_dev *ndev)
165{
166	struct st_nci_info *info = nci_get_drvdata(ndev);
167
168	ndlc_close(info->ndlc);
169
170	nci_unregister_device(ndev);
171	nci_free_device(ndev);
172}
173EXPORT_SYMBOL_GPL(st_nci_remove);
174
175MODULE_LICENSE("GPL");
176MODULE_DESCRIPTION(DRIVER_DESC);