1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Generic driver for NXP NCI NFC chips
4 *
5 * Copyright (C) 2014 NXP Semiconductors All rights reserved.
6 *
7 * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
8 *
9 * Derived from PN544 device driver:
10 * Copyright (C) 2012 Intel Corporation. All rights reserved.
11 */
12
13 #include <linux/delay.h>
14 #include <linux/module.h>
15 #include <linux/nfc.h>
16
17 #include <net/nfc/nci_core.h>
18
19 #include "nxp-nci.h"
20
21 #define NXP_NCI_HDR_LEN 4
22
23 #define NXP_NCI_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
24 NFC_PROTO_MIFARE_MASK | \
25 NFC_PROTO_FELICA_MASK | \
26 NFC_PROTO_ISO14443_MASK | \
27 NFC_PROTO_ISO14443_B_MASK | \
28 NFC_PROTO_NFC_DEP_MASK)
29
nxp_nci_open(struct nci_dev * ndev)30 static int nxp_nci_open(struct nci_dev *ndev)
31 {
32 struct nxp_nci_info *info = nci_get_drvdata(ndev);
33 int r = 0;
34
35 mutex_lock(&info->info_lock);
36
37 if (info->mode != NXP_NCI_MODE_COLD) {
38 r = -EBUSY;
39 goto open_exit;
40 }
41
42 if (info->phy_ops->set_mode)
43 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
44
45 info->mode = NXP_NCI_MODE_NCI;
46
47 open_exit:
48 mutex_unlock(&info->info_lock);
49 return r;
50 }
51
nxp_nci_close(struct nci_dev * ndev)52 static int nxp_nci_close(struct nci_dev *ndev)
53 {
54 struct nxp_nci_info *info = nci_get_drvdata(ndev);
55 int r = 0;
56
57 mutex_lock(&info->info_lock);
58
59 if (info->phy_ops->set_mode)
60 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
61
62 info->mode = NXP_NCI_MODE_COLD;
63
64 mutex_unlock(&info->info_lock);
65 return r;
66 }
67
nxp_nci_send(struct nci_dev * ndev,struct sk_buff * skb)68 static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
69 {
70 struct nxp_nci_info *info = nci_get_drvdata(ndev);
71 int r;
72
73 if (!info->phy_ops->write)
74 return -EOPNOTSUPP;
75
76 if (info->mode != NXP_NCI_MODE_NCI)
77 return -EINVAL;
78
79 r = info->phy_ops->write(info->phy_id, skb);
80 if (r < 0) {
81 kfree_skb(skb);
82 return r;
83 }
84
85 consume_skb(skb);
86 return 0;
87 }
88
89 static struct nci_ops nxp_nci_ops = {
90 .open = nxp_nci_open,
91 .close = nxp_nci_close,
92 .send = nxp_nci_send,
93 .fw_download = nxp_nci_fw_download,
94 };
95
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)96 int nxp_nci_probe(void *phy_id, struct device *pdev,
97 const struct nxp_nci_phy_ops *phy_ops,
98 unsigned int max_payload,
99 struct nci_dev **ndev)
100 {
101 struct nxp_nci_info *info;
102 int r;
103
104 info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
105 if (!info)
106 return -ENOMEM;
107
108 info->phy_id = phy_id;
109 info->pdev = pdev;
110 info->phy_ops = phy_ops;
111 info->max_payload = max_payload;
112 INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
113 init_completion(&info->fw_info.cmd_completion);
114 mutex_init(&info->info_lock);
115
116 if (info->phy_ops->set_mode) {
117 r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
118 if (r < 0)
119 return r;
120 }
121
122 info->mode = NXP_NCI_MODE_COLD;
123
124 info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
125 NXP_NCI_HDR_LEN, 0);
126 if (!info->ndev)
127 return -ENOMEM;
128
129 nci_set_parent_dev(info->ndev, pdev);
130 nci_set_drvdata(info->ndev, info);
131 r = nci_register_device(info->ndev);
132 if (r < 0) {
133 nci_free_device(info->ndev);
134 return r;
135 }
136
137 *ndev = info->ndev;
138 return r;
139 }
140 EXPORT_SYMBOL(nxp_nci_probe);
141
nxp_nci_remove(struct nci_dev * ndev)142 void nxp_nci_remove(struct nci_dev *ndev)
143 {
144 struct nxp_nci_info *info = nci_get_drvdata(ndev);
145
146 if (info->mode == NXP_NCI_MODE_FW)
147 nxp_nci_fw_work_complete(info, -ESHUTDOWN);
148 cancel_work_sync(&info->fw_info.work);
149
150 mutex_lock(&info->info_lock);
151
152 if (info->phy_ops->set_mode)
153 info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
154
155 nci_unregister_device(ndev);
156 nci_free_device(ndev);
157
158 mutex_unlock(&info->info_lock);
159 }
160 EXPORT_SYMBOL(nxp_nci_remove);
161
162 MODULE_LICENSE("GPL");
163 MODULE_DESCRIPTION("NXP NCI NFC driver");
164 MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");
165