Merge branch 'for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/mason...
[firefly-linux-kernel-4.4.55.git] / drivers / nfc / st-nci / core.c
1 /*
2  * NCI based Driver for STMicroelectronics NFC Chip
3  *
4  * Copyright (C) 2014-2015  STMicroelectronics SAS. All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms and conditions of the GNU General Public License,
8  * version 2, as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18
19 #include <linux/module.h>
20 #include <linux/nfc.h>
21 #include <net/nfc/nci.h>
22 #include <net/nfc/nci_core.h>
23 #include <linux/gpio.h>
24 #include <linux/delay.h>
25
26 #include "st-nci.h"
27 #include "st-nci_se.h"
28
29 #define DRIVER_DESC "NCI NFC driver for ST_NCI"
30
31 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
32
33 static int st_nci_init(struct nci_dev *ndev)
34 {
35         struct nci_mode_set_cmd cmd;
36
37         cmd.cmd_type = ST_NCI_SET_NFC_MODE;
38         cmd.mode = 1;
39
40         return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
41                         sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
42 }
43
44 static int st_nci_open(struct nci_dev *ndev)
45 {
46         struct st_nci_info *info = nci_get_drvdata(ndev);
47         int r;
48
49         if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
50                 return 0;
51
52         r = ndlc_open(info->ndlc);
53         if (r)
54                 clear_bit(ST_NCI_RUNNING, &info->flags);
55
56         return r;
57 }
58
59 static int st_nci_close(struct nci_dev *ndev)
60 {
61         struct st_nci_info *info = nci_get_drvdata(ndev);
62
63         if (!test_bit(ST_NCI_RUNNING, &info->flags))
64                 return 0;
65
66         ndlc_close(info->ndlc);
67
68         clear_bit(ST_NCI_RUNNING, &info->flags);
69
70         return 0;
71 }
72
73 static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
74 {
75         struct st_nci_info *info = nci_get_drvdata(ndev);
76
77         skb->dev = (void *)ndev;
78
79         if (!test_bit(ST_NCI_RUNNING, &info->flags))
80                 return -EBUSY;
81
82         return ndlc_send(info->ndlc, skb);
83 }
84
85 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
86                                          __u8 rf_protocol)
87 {
88         return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
89                 NFC_PROTO_ISO15693_MASK : 0;
90 }
91
92 static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
93                                         struct sk_buff *skb)
94 {
95         __u8 status = skb->data[0];
96
97         nci_req_complete(ndev, status);
98         return 0;
99 }
100
101 static struct nci_prop_ops st_nci_prop_ops[] = {
102         {
103                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
104                                           ST_NCI_CORE_PROP),
105                 .rsp = st_nci_prop_rsp_packet,
106         },
107 };
108
109 static struct nci_ops st_nci_ops = {
110         .init = st_nci_init,
111         .open = st_nci_open,
112         .close = st_nci_close,
113         .send = st_nci_send,
114         .get_rfprotocol = st_nci_get_rfprotocol,
115         .discover_se = st_nci_discover_se,
116         .enable_se = st_nci_enable_se,
117         .disable_se = st_nci_disable_se,
118         .se_io = st_nci_se_io,
119         .hci_load_session = st_nci_hci_load_session,
120         .hci_event_received = st_nci_hci_event_received,
121         .hci_cmd_received = st_nci_hci_cmd_received,
122         .prop_ops = st_nci_prop_ops,
123         .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
124 };
125
126 int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
127                        int phy_tailroom)
128 {
129         struct st_nci_info *info;
130         int r;
131         u32 protocols;
132
133         info = devm_kzalloc(ndlc->dev,
134                         sizeof(struct st_nci_info), GFP_KERNEL);
135         if (!info)
136                 return -ENOMEM;
137
138         protocols = NFC_PROTO_JEWEL_MASK
139                 | NFC_PROTO_MIFARE_MASK
140                 | NFC_PROTO_FELICA_MASK
141                 | NFC_PROTO_ISO14443_MASK
142                 | NFC_PROTO_ISO14443_B_MASK
143                 | NFC_PROTO_ISO15693_MASK
144                 | NFC_PROTO_NFC_DEP_MASK;
145
146         ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
147                                         phy_headroom, phy_tailroom);
148         if (!ndlc->ndev) {
149                 pr_err("Cannot allocate nfc ndev\n");
150                 return -ENOMEM;
151         }
152         info->ndlc = ndlc;
153
154         nci_set_drvdata(ndlc->ndev, info);
155
156         r = nci_register_device(ndlc->ndev);
157         if (r) {
158                 pr_err("Cannot register nfc device to nci core\n");
159                 nci_free_device(ndlc->ndev);
160                 return r;
161         }
162
163         return st_nci_se_init(ndlc->ndev);
164 }
165 EXPORT_SYMBOL_GPL(st_nci_probe);
166
167 void st_nci_remove(struct nci_dev *ndev)
168 {
169         struct st_nci_info *info = nci_get_drvdata(ndev);
170
171         ndlc_close(info->ndlc);
172
173         nci_unregister_device(ndev);
174         nci_free_device(ndev);
175 }
176 EXPORT_SYMBOL_GPL(st_nci_remove);
177
178 MODULE_LICENSE("GPL");
179 MODULE_DESCRIPTION(DRIVER_DESC);