summaryrefslogtreecommitdiffstats
path: root/net/nfc/nci/ntf.c
blob: 96633f5cda4f790d3bae4ecdfa4f3a6435c5797c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
/*
 *  The NFC Controller Interface is the communication protocol between an
 *  NFC Controller (NFCC) and a Device Host (DH).
 *
 *  Copyright (C) 2011 Texas Instruments, Inc.
 *
 *  Written by Ilan Elias <ilane@ti.com>
 *
 *  Acknowledgements:
 *  This file is based on hci_event.c, which was written
 *  by Maxim Krasnyansky.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/skbuff.h>

#include "../nfc.h"
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include <linux/nfc.h>

/* Handle NCI Notification packets */

static void nci_core_conn_credits_ntf_packet(struct nci_dev *ndev,
						struct sk_buff *skb)
{
	struct nci_core_conn_credit_ntf *ntf = (void *) skb->data;
	int i;

	nfc_dbg("entry, num_entries %d", ntf->num_entries);

	if (ntf->num_entries > NCI_MAX_NUM_CONN)
		ntf->num_entries = NCI_MAX_NUM_CONN;

	/* update the credits */
	for (i = 0; i < ntf->num_entries; i++) {
		nfc_dbg("entry[%d]: conn_id %d, credits %d", i,
			ntf->conn_entries[i].conn_id,
			ntf->conn_entries[i].credits);

		if (ntf->conn_entries[i].conn_id == ndev->conn_id) {
			/* found static rf connection */
			atomic_add(ntf->conn_entries[i].credits,
				&ndev->credits_cnt);
		}
	}

	/* trigger the next tx */
	if (!skb_queue_empty(&ndev->tx_q))
		queue_work(ndev->tx_wq, &ndev->tx_work);
}

static void nci_rf_field_info_ntf_packet(struct nci_dev *ndev,
					struct sk_buff *skb)
{
	struct nci_rf_field_info_ntf *ntf = (void *) skb->data;

	nfc_dbg("entry, rf_field_status %d", ntf->rf_field_status);
}

static int nci_rf_activate_nfca_passive_poll(struct nci_dev *ndev,
			struct nci_rf_activate_ntf *ntf, __u8 *data)
{
	struct rf_tech_specific_params_nfca_poll *nfca_poll;
	struct activation_params_nfca_poll_iso_dep *nfca_poll_iso_dep;

	nfca_poll = &ntf->rf_tech_specific_params.nfca_poll;
	nfca_poll_iso_dep = &ntf->activation_params.nfca_poll_iso_dep;

	nfca_poll->sens_res = __le16_to_cpu(*((__u16 *)data));
	data += 2;

	nfca_poll->nfcid1_len = *data++;

	nfc_dbg("sens_res 0x%x, nfcid1_len %d",
		nfca_poll->sens_res,
		nfca_poll->nfcid1_len);

	memcpy(nfca_poll->nfcid1, data, nfca_poll->nfcid1_len);
	data += nfca_poll->nfcid1_len;

	nfca_poll->sel_res_len = *data++;

	if (nfca_poll->sel_res_len != 0)
		nfca_poll->sel_res = *data++;

	ntf->rf_interface_type = *data++;
	ntf->activation_params_len = *data++;

	nfc_dbg("sel_res_len %d, sel_res 0x%x, rf_interface_type %d, activation_params_len %d",
		nfca_poll->sel_res_len,
		nfca_poll->sel_res,
		ntf->rf_interface_type,
		ntf->activation_params_len);

	switch (ntf->rf_interface_type) {
	case NCI_RF_INTERFACE_ISO_DEP:
		nfca_poll_iso_dep->rats_res_len = *data++;
		if (nfca_poll_iso_dep->rats_res_len > 0) {
			memcpy(nfca_poll_iso_dep->rats_res,
				data,
				nfca_poll_iso_dep->rats_res_len);
		}
		break;

	case NCI_RF_INTERFACE_FRAME:
		/* no activation params */
		break;

	default:
		nfc_err("unsupported rf_interface_type 0x%x",
			ntf->rf_interface_type);
		return -EPROTO;
	}

	return 0;
}

static void nci_target_found(struct nci_dev *ndev,
				struct nci_rf_activate_ntf *ntf)
{
	struct nfc_target nfc_tgt;

	if (ntf->rf_protocol == NCI_RF_PROTOCOL_T2T)	/* T2T MifareUL */
		nfc_tgt.supported_protocols = NFC_PROTO_MIFARE_MASK;
	else if (ntf->rf_protocol == NCI_RF_PROTOCOL_ISO_DEP)	/* 4A */
		nfc_tgt.supported_protocols = NFC_PROTO_ISO14443_MASK;

	nfc_tgt.sens_res = ntf->rf_tech_specific_params.nfca_poll.sens_res;
	nfc_tgt.sel_res = ntf->rf_tech_specific_params.nfca_poll.sel_res;

	if (!(nfc_tgt.supported_protocols & ndev->poll_prots)) {
		nfc_dbg("the target found does not have the desired protocol");
		return;
	}

	nfc_dbg("new target found,  supported_protocols 0x%x",
		nfc_tgt.supported_protocols);

	ndev->target_available_prots = nfc_tgt.supported_protocols;

	nfc_targets_found(ndev->nfc_dev, &nfc_tgt, 1);
}

static void nci_rf_activate_ntf_packet(struct nci_dev *ndev,
					struct sk_buff *skb)
{
	struct nci_rf_activate_ntf ntf;
	__u8 *data = skb->data;
	int rc = -1;

	clear_bit(NCI_DISCOVERY, &ndev->flags);
	set_bit(NCI_POLL_ACTIVE, &ndev->flags);

	ntf.target_handle = *data++;
	ntf.rf_protocol = *data++;
	ntf.rf_tech_and_mode = *data++;
	ntf.rf_tech_specific_params_len = *data++;

	nfc_dbg("target_handle %d, rf_protocol 0x%x, rf_tech_and_mode 0x%x, rf_tech_specific_params_len %d",
		ntf.target_handle,
		ntf.rf_protocol,
		ntf.rf_tech_and_mode,
		ntf.rf_tech_specific_params_len);

	switch (ntf.rf_tech_and_mode) {
	case NCI_NFC_A_PASSIVE_POLL_MODE:
		rc = nci_rf_activate_nfca_passive_poll(ndev, &ntf,
			data);
		break;

	default:
		nfc_err("unsupported rf_tech_and_mode 0x%x",
			ntf.rf_tech_and_mode);
		return;
	}

	if (!rc)
		nci_target_found(ndev, &ntf);
}

static void nci_rf_deactivate_ntf_packet(struct nci_dev *ndev,
					struct sk_buff *skb)
{
	__u8 type = skb->data[0];

	nfc_dbg("entry, type 0x%x", type);

	clear_bit(NCI_POLL_ACTIVE, &ndev->flags);
	ndev->target_active_prot = 0;

	/* drop tx data queue */
	skb_queue_purge(&ndev->tx_q);

	/* drop partial rx data packet */
	if (ndev->rx_data_reassembly) {
		kfree_skb(ndev->rx_data_reassembly);
		ndev->rx_data_reassembly = 0;
	}

	/* complete the data exchange transaction, if exists */
	if (test_bit(NCI_DATA_EXCHANGE, &ndev->flags))
		nci_data_exchange_complete(ndev, NULL, -EIO);
}

void nci_ntf_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
	__u16 ntf_opcode = nci_opcode(skb->data);

	nfc_dbg("NCI RX: MT=ntf, PBF=%d, GID=0x%x, OID=0x%x, plen=%d",
			nci_pbf(skb->data),
			nci_opcode_gid(ntf_opcode),
			nci_opcode_oid(ntf_opcode),
			nci_plen(skb->data));

	/* strip the nci control header */
	skb_pull(skb, NCI_CTRL_HDR_SIZE);

	switch (ntf_opcode) {
	case NCI_OP_CORE_CONN_CREDITS_NTF:
		nci_core_conn_credits_ntf_packet(ndev, skb);
		break;

	case NCI_OP_RF_FIELD_INFO_NTF:
		nci_rf_field_info_ntf_packet(ndev, skb);
		break;

	case NCI_OP_RF_ACTIVATE_NTF:
		nci_rf_activate_ntf_packet(ndev, skb);
		break;

	case NCI_OP_RF_DEACTIVATE_NTF:
		nci_rf_deactivate_ntf_packet(ndev, skb);
		break;

	default:
		nfc_err("unknown ntf opcode 0x%x", ntf_opcode);
		break;
	}

	kfree_skb(skb);
}