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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
[karo-tx-linux.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
28 #define DRIVER_DESC "NCI NFC driver for ST_NCI"
29
30 #define ST_NCI1_X_PROPRIETARY_ISO15693 0x83
31
32 static int st_nci_init(struct nci_dev *ndev)
33 {
34         struct nci_mode_set_cmd cmd;
35
36         cmd.cmd_type = ST_NCI_SET_NFC_MODE;
37         cmd.mode = 1;
38
39         return nci_prop_cmd(ndev, ST_NCI_CORE_PROP,
40                         sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
41 }
42
43 static int st_nci_open(struct nci_dev *ndev)
44 {
45         struct st_nci_info *info = nci_get_drvdata(ndev);
46         int r;
47
48         if (test_and_set_bit(ST_NCI_RUNNING, &info->flags))
49                 return 0;
50
51         r = ndlc_open(info->ndlc);
52         if (r)
53                 clear_bit(ST_NCI_RUNNING, &info->flags);
54
55         return r;
56 }
57
58 static int st_nci_close(struct nci_dev *ndev)
59 {
60         struct st_nci_info *info = nci_get_drvdata(ndev);
61
62         if (!test_bit(ST_NCI_RUNNING, &info->flags))
63                 return 0;
64
65         ndlc_close(info->ndlc);
66
67         clear_bit(ST_NCI_RUNNING, &info->flags);
68
69         return 0;
70 }
71
72 static int st_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
73 {
74         struct st_nci_info *info = nci_get_drvdata(ndev);
75
76         skb->dev = (void *)ndev;
77
78         if (!test_bit(ST_NCI_RUNNING, &info->flags))
79                 return -EBUSY;
80
81         return ndlc_send(info->ndlc, skb);
82 }
83
84 static __u32 st_nci_get_rfprotocol(struct nci_dev *ndev,
85                                          __u8 rf_protocol)
86 {
87         return rf_protocol == ST_NCI1_X_PROPRIETARY_ISO15693 ?
88                 NFC_PROTO_ISO15693_MASK : 0;
89 }
90
91 static int st_nci_prop_rsp_packet(struct nci_dev *ndev,
92                                         struct sk_buff *skb)
93 {
94         __u8 status = skb->data[0];
95
96         nci_req_complete(ndev, status);
97         return 0;
98 }
99
100 static struct nci_driver_ops st_nci_prop_ops[] = {
101         {
102                 .opcode = nci_opcode_pack(NCI_GID_PROPRIETARY,
103                                           ST_NCI_CORE_PROP),
104                 .rsp = st_nci_prop_rsp_packet,
105         },
106 };
107
108 static struct nci_ops st_nci_ops = {
109         .init = st_nci_init,
110         .open = st_nci_open,
111         .close = st_nci_close,
112         .send = st_nci_send,
113         .get_rfprotocol = st_nci_get_rfprotocol,
114         .discover_se = st_nci_discover_se,
115         .enable_se = st_nci_enable_se,
116         .disable_se = st_nci_disable_se,
117         .se_io = st_nci_se_io,
118         .hci_load_session = st_nci_hci_load_session,
119         .hci_event_received = st_nci_hci_event_received,
120         .hci_cmd_received = st_nci_hci_cmd_received,
121         .prop_ops = st_nci_prop_ops,
122         .n_prop_ops = ARRAY_SIZE(st_nci_prop_ops),
123 };
124
125 int st_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
126                  int phy_tailroom, struct st_nci_se_status *se_status)
127 {
128         struct st_nci_info *info;
129         int r;
130         u32 protocols;
131
132         info = devm_kzalloc(ndlc->dev,
133                         sizeof(struct st_nci_info), GFP_KERNEL);
134         if (!info)
135                 return -ENOMEM;
136
137         protocols = NFC_PROTO_JEWEL_MASK
138                 | NFC_PROTO_MIFARE_MASK
139                 | NFC_PROTO_FELICA_MASK
140                 | NFC_PROTO_ISO14443_MASK
141                 | NFC_PROTO_ISO14443_B_MASK
142                 | NFC_PROTO_ISO15693_MASK
143                 | NFC_PROTO_NFC_DEP_MASK;
144
145         ndlc->ndev = nci_allocate_device(&st_nci_ops, protocols,
146                                         phy_headroom, phy_tailroom);
147         if (!ndlc->ndev) {
148                 pr_err("Cannot allocate nfc ndev\n");
149                 return -ENOMEM;
150         }
151         info->ndlc = ndlc;
152
153         nci_set_drvdata(ndlc->ndev, info);
154
155         r = st_nci_vendor_cmds_init(ndlc->ndev);
156         if (r) {
157                 pr_err("Cannot register proprietary vendor cmds\n");
158                 goto err_reg_dev;
159         }
160
161         r = nci_register_device(ndlc->ndev);
162         if (r) {
163                 pr_err("Cannot register nfc device to nci core\n");
164                 goto err_reg_dev;
165         }
166
167         return st_nci_se_init(ndlc->ndev, se_status);
168
169 err_reg_dev:
170         nci_free_device(ndlc->ndev);
171         return r;
172 }
173 EXPORT_SYMBOL_GPL(st_nci_probe);
174
175 void st_nci_remove(struct nci_dev *ndev)
176 {
177         struct st_nci_info *info = nci_get_drvdata(ndev);
178
179         ndlc_close(info->ndlc);
180
181         nci_unregister_device(ndev);
182         nci_free_device(ndev);
183 }
184 EXPORT_SYMBOL_GPL(st_nci_remove);
185
186 MODULE_LICENSE("GPL");
187 MODULE_DESCRIPTION(DRIVER_DESC);