summaryrefslogtreecommitdiffstats
path: root/drivers/nfc/nxp-nci/core.c
blob: 8dafc696719fe7d18b1b2b66366af76cdcb67346 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Generic driver for NXP NCI NFC chips
 *
 * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
 *
 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
 *
 * Derived from PN544 device driver:
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/nfc.h>
#include <linux/platform_data/nxp-nci.h>

#include <net/nfc/nci_core.h>

#include "nxp-nci.h"

#define NXP_NCI_HDR_LEN	4

#define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
			       NFC_PROTO_MIFARE_MASK | \
			       NFC_PROTO_FELICA_MASK | \
			       NFC_PROTO_ISO14443_MASK | \
			       NFC_PROTO_ISO14443_B_MASK | \
			       NFC_PROTO_NFC_DEP_MASK)

static int nxp_nci_open(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r = 0;

	mutex_lock(&info->info_lock);

	if (info->mode != NXP_NCI_MODE_COLD) {
		r = -EBUSY;
		goto open_exit;
	}

	if (info->phy_ops->set_mode)
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);

	info->mode = NXP_NCI_MODE_NCI;

open_exit:
	mutex_unlock(&info->info_lock);
	return r;
}

static int nxp_nci_close(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r = 0;

	mutex_lock(&info->info_lock);

	if (info->phy_ops->set_mode)
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);

	info->mode = NXP_NCI_MODE_COLD;

	mutex_unlock(&info->info_lock);
	return r;
}

static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	int r;

	if (!info->phy_ops->write) {
		r = -ENOTSUPP;
		goto send_exit;
	}

	if (info->mode != NXP_NCI_MODE_NCI) {
		r = -EINVAL;
		goto send_exit;
	}

	r = info->phy_ops->write(info->phy_id, skb);
	if (r < 0)
		kfree_skb(skb);

send_exit:
	return r;
}

static struct nci_ops nxp_nci_ops = {
	.open = nxp_nci_open,
	.close = nxp_nci_close,
	.send = nxp_nci_send,
	.fw_download = nxp_nci_fw_download,
};

int nxp_nci_probe(void *phy_id, struct device *pdev,
		  const struct nxp_nci_phy_ops *phy_ops,
		  unsigned int max_payload,
		  struct nci_dev **ndev)
{
	struct nxp_nci_info *info;
	int r;

	info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
	if (!info) {
		r = -ENOMEM;
		goto probe_exit;
	}

	info->phy_id = phy_id;
	info->pdev = pdev;
	info->phy_ops = phy_ops;
	info->max_payload = max_payload;
	INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
	init_completion(&info->fw_info.cmd_completion);
	mutex_init(&info->info_lock);

	if (info->phy_ops->set_mode) {
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
		if (r < 0)
			goto probe_exit;
	}

	info->mode = NXP_NCI_MODE_COLD;

	info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
					 NXP_NCI_HDR_LEN, 0);
	if (!info->ndev) {
		r = -ENOMEM;
		goto probe_exit;
	}

	nci_set_parent_dev(info->ndev, pdev);
	nci_set_drvdata(info->ndev, info);
	r = nci_register_device(info->ndev);
	if (r < 0)
		goto probe_exit_free_nci;

	*ndev = info->ndev;

	goto probe_exit;

probe_exit_free_nci:
	nci_free_device(info->ndev);
probe_exit:
	return r;
}
EXPORT_SYMBOL(nxp_nci_probe);

void nxp_nci_remove(struct nci_dev *ndev)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);

	if (info->mode == NXP_NCI_MODE_FW)
		nxp_nci_fw_work_complete(info, -ESHUTDOWN);
	cancel_work_sync(&info->fw_info.work);

	mutex_lock(&info->info_lock);

	if (info->phy_ops->set_mode)
		info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);

	nci_unregister_device(ndev);
	nci_free_device(ndev);

	mutex_unlock(&info->info_lock);
}
EXPORT_SYMBOL(nxp_nci_remove);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NXP NCI NFC driver");
MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");