Commit | Line | Data |
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6a2968aa IE |
1 | /* |
2 | * The NFC Controller Interface is the communication protocol between an | |
3 | * NFC Controller (NFCC) and a Device Host (DH). | |
4 | * | |
5 | * Copyright (C) 2011 Texas Instruments, Inc. | |
6 | * | |
7 | * Written by Ilan Elias <ilane@ti.com> | |
8 | * | |
9 | * Acknowledgements: | |
10 | * This file is based on hci_event.c, which was written | |
11 | * by Maxim Krasnyansky. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 | |
15 | * as published by the Free Software Foundation | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with this program; if not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/types.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/bitops.h> | |
31 | #include <linux/skbuff.h> | |
32 | ||
33 | #include "../nfc.h" | |
34 | #include <net/nfc/nci.h> | |
35 | #include <net/nfc/nci_core.h> | |
36 | #include <linux/nfc.h> | |
37 | ||
38 | /* Handle NCI Notification packets */ | |
39 | ||
40 | static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev, | |
41 | struct sk_buff *skb) | |
42 | { | |
43 | struct nci_core_conn_credit_ntf *ntf = (void *) skb->data; | |
44 | int i; | |
45 | ||
46 | nfc_dbg("entry, num_entries %d", ntf->num_entries); | |
47 | ||
48 | if (ntf->num_entries > NCI_MAX_NUM_CONN) | |
49 | ntf->num_entries = NCI_MAX_NUM_CONN; | |
50 | ||
51 | /* update the credits */ | |
52 | for (i = 0; i < ntf->num_entries; i++) { | |
53 | nfc_dbg("entry[%d]: conn_id %d, credits %d", i, | |
54 | ntf->conn_entries[i].conn_id, | |
55 | ntf->conn_entries[i].credits); | |
56 | ||
57 | if (ntf->conn_entries[i].conn_id == ndev->conn_id) { | |
58 | /* found static rf connection */ | |
59 | atomic_add(ntf->conn_entries[i].credits, | |
60 | &ndev->credits_cnt); | |
61 | } | |
62 | } | |
63 | ||
64 | /* trigger the next tx */ | |
65 | if (!skb_queue_empty(&ndev->tx_q)) | |
66 | queue_work(ndev->tx_wq, &ndev->tx_work); | |
67 | } | |
68 | ||
69 | static void nci_rf_field_info_ntf_packet(struct nci_dev *ndev, | |
70 | struct sk_buff *skb) | |
71 | { | |
72 | struct nci_rf_field_info_ntf *ntf = (void *) skb->data; | |
73 | ||
74 | nfc_dbg("entry, rf_field_status %d", ntf->rf_field_status); | |
75 | } | |
76 | ||
77 | static int nci_rf_activate_nfca_passive_poll(struct nci_dev *ndev, | |
78 | struct nci_rf_activate_ntf *ntf, __u8 *data) | |
79 | { | |
80 | struct rf_tech_specific_params_nfca_poll *nfca_poll; | |
81 | struct activation_params_nfca_poll_iso_dep *nfca_poll_iso_dep; | |
82 | ||
83 | nfca_poll = &ntf->rf_tech_specific_params.nfca_poll; | |
84 | nfca_poll_iso_dep = &ntf->activation_params.nfca_poll_iso_dep; | |
85 | ||
86 | nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data)); | |
87 | data += 2; | |
88 | ||
89 | nfca_poll->nfcid1_len = *data++; | |
90 | ||
91 | nfc_dbg("sens_res 0x%x, nfcid1_len %d", | |
92 | nfca_poll->sens_res, | |
93 | nfca_poll->nfcid1_len); | |
94 | ||
95 | memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len); | |
96 | data += nfca_poll->nfcid1_len; | |
97 | ||
98 | nfca_poll->sel_res_len = *data++; | |
99 | ||
100 | if (nfca_poll->sel_res_len != 0) | |
101 | nfca_poll->sel_res = *data++; | |
102 | ||
103 | ntf->rf_interface_type = *data++; | |
104 | ntf->activation_params_len = *data++; | |
105 | ||
106 | nfc_dbg("sel_res_len %d, sel_res 0x%x, rf_interface_type %d, activation_params_len %d", | |
107 | nfca_poll->sel_res_len, | |
108 | nfca_poll->sel_res, | |
109 | ntf->rf_interface_type, | |
110 | ntf->activation_params_len); | |
111 | ||
112 | switch (ntf->rf_interface_type) { | |
113 | case NCI_RF_INTERFACE_ISO_DEP: | |
114 | nfca_poll_iso_dep->rats_res_len = *data++; | |
115 | if (nfca_poll_iso_dep->rats_res_len > 0) { | |
116 | memcpy(nfca_poll_iso_dep->rats_res, | |
117 | data, | |
118 | nfca_poll_iso_dep->rats_res_len); | |
119 | } | |
120 | break; | |
121 | ||
122 | case NCI_RF_INTERFACE_FRAME: | |
123 | /* no activation params */ | |
124 | break; | |
125 | ||
126 | default: | |
127 | nfc_err("unsupported rf_interface_type 0x%x", | |
128 | ntf->rf_interface_type); | |
129 | return -EPROTO; | |
130 | } | |
131 | ||
132 | return 0; | |
133 | } | |
134 | ||
135 | static void nci_target_found(struct nci_dev *ndev, | |
136 | struct nci_rf_activate_ntf *ntf) | |
137 | { | |
138 | struct nfc_target nfc_tgt; | |
139 | ||
140 | if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T) /* T2T MifareUL */ | |
141 | nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK; | |
142 | else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP) /* 4A */ | |
143 | nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK; | |
144 | ||
145 | nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res; | |
146 | nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res; | |
147 | ||
148 | if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) { | |
149 | nfc_dbg("the target found does not have the desired protocol"); | |
150 | return; | |
151 | } | |
152 | ||
153 | nfc_dbg("new target found, supported_protocols 0x%x", | |
154 | nfc_tgt.supported_protocols); | |
155 | ||
156 | ndev->target_available_prots = nfc_tgt.supported_protocols; | |
157 | ||
158 | nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1); | |
159 | } | |
160 | ||
161 | static void nci_rf_activate_ntf_packet(struct nci_dev *ndev, | |
162 | struct sk_buff *skb) | |
163 | { | |
164 | struct nci_rf_activate_ntf ntf; | |
165 | __u8 *data = skb->data; | |
166 | int rc = -1; | |
167 | ||
168 | clear_bit(NCI_DISCOVERY, &ndev->flags); | |
169 | set_bit(NCI_POLL_ACTIVE, &ndev->flags); | |
170 | ||
171 | ntf.target_handle = *data++; | |
172 | ntf.rf_protocol = *data++; | |
173 | ntf.rf_tech_and_mode = *data++; | |
174 | ntf.rf_tech_specific_params_len = *data++; | |
175 | ||
176 | nfc_dbg("target_handle %d, rf_protocol 0x%x, rf_tech_and_mode 0x%x, rf_tech_specific_params_len %d", | |
177 | ntf.target_handle, | |
178 | ntf.rf_protocol, | |
179 | ntf.rf_tech_and_mode, | |
180 | ntf.rf_tech_specific_params_len); | |
181 | ||
182 | switch (ntf.rf_tech_and_mode) { | |
183 | case NCI_NFC_A_PASSIVE_POLL_MODE: | |
184 | rc = nci_rf_activate_nfca_passive_poll(ndev, &ntf, | |
185 | data); | |
186 | break; | |
187 | ||
188 | default: | |
189 | nfc_err("unsupported rf_tech_and_mode 0x%x", | |
190 | ntf.rf_tech_and_mode); | |
191 | return; | |
192 | } | |
193 | ||
194 | if (!rc) | |
195 | nci_target_found(ndev, &ntf); | |
196 | } | |
197 | ||
198 | static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev, | |
199 | struct sk_buff *skb) | |
200 | { | |
201 | __u8 type = skb->data[0]; | |
202 | ||
203 | nfc_dbg("entry, type 0x%x", type); | |
204 | ||
205 | clear_bit(NCI_POLL_ACTIVE, &ndev->flags); | |
206 | ndev->target_active_prot = 0; | |
207 | ||
208 | /* drop tx data queue */ | |
209 | skb_queue_purge(&ndev->tx_q); | |
210 | ||
211 | /* drop partial rx data packet */ | |
212 | if (ndev->rx_data_reassembly) { | |
213 | kfree_skb(ndev->rx_data_reassembly); | |
214 | ndev->rx_data_reassembly = 0; | |
215 | } | |
216 | ||
217 | /* complete the data exchange transaction, if exists */ | |
218 | if (ndev->data_exchange_cb) | |
219 | nci_data_exchange_complete(ndev, NULL, -EIO); | |
220 | } | |
221 | ||
222 | void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb) | |
223 | { | |
224 | __u16 ntf_opcode = nci_opcode(skb->data); | |
225 | ||
226 | nfc_dbg("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d", | |
227 | nci_pbf(skb->data), | |
228 | nci_opcode_gid(ntf_opcode), | |
229 | nci_opcode_oid(ntf_opcode), | |
230 | nci_plen(skb->data)); | |
231 | ||
232 | /* strip the nci control header */ | |
233 | skb_pull(skb, NCI_CTRL_HDR_SIZE); | |
234 | ||
235 | switch (ntf_opcode) { | |
236 | case NCI_OP_CORE_CONN_CREDITS_NTF: | |
237 | nci_core_conn_credits_ntf_packet(ndev, skb); | |
238 | break; | |
239 | ||
240 | case NCI_OP_RF_FIELD_INFO_NTF: | |
241 | nci_rf_field_info_ntf_packet(ndev, skb); | |
242 | break; | |
243 | ||
244 | case NCI_OP_RF_ACTIVATE_NTF: | |
245 | nci_rf_activate_ntf_packet(ndev, skb); | |
246 | break; | |
247 | ||
248 | case NCI_OP_RF_DEACTIVATE_NTF: | |
249 | nci_rf_deactivate_ntf_packet(ndev, skb); | |
250 | break; | |
251 | ||
252 | default: | |
253 | nfc_err("unknown ntf opcode 0x%x", ntf_opcode); | |
254 | break; | |
255 | } | |
256 | ||
257 | kfree_skb(skb); | |
258 | } |