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
st_nci_init(struct nci_dev * ndev)19 static 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
st_nci_open(struct nci_dev * ndev)30 static 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
st_nci_close(struct nci_dev * ndev)45 static 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
st_nci_send(struct nci_dev * ndev,struct sk_buff * skb)59 static 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
st_nci_get_rfprotocol(struct nci_dev * ndev,__u8 rf_protocol)71 static __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
st_nci_prop_rsp_packet(struct nci_dev * ndev,struct sk_buff * skb)78 static 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
87 static 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
95 static 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
st_nci_probe(struct llt_ndlc * ndlc,int phy_headroom,int phy_tailroom,struct st_nci_se_status * se_status)112 int 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
157 err_reg_dev:
158 nci_free_device(ndlc->ndev);
159 return r;
160 }
161 EXPORT_SYMBOL_GPL(st_nci_probe);
162
st_nci_remove(struct nci_dev * ndev)163 void 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 }
172 EXPORT_SYMBOL_GPL(st_nci_remove);
173
174 MODULE_LICENSE("GPL");
175 MODULE_DESCRIPTION(DRIVER_DESC);
176