xref: /openbmc/linux/drivers/nfc/st-nci/core.c (revision 2603ca87)
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