summaryrefslogtreecommitdiff
path: root/net/nfc/nci/rsp.c
blob: 69fe163b7350825f1a4731a8357ac99c45da385f (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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
/*
 *  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, see <http://www.gnu.org/licenses/>.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__

#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>

/* Handle NCI Response packets */

static void nci_core_reset_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nci_core_reset_rsp *rsp = (void *) skb->data;

	pr_debug("status 0x%x\n", rsp->status);

	if (rsp->status == NCI_STATUS_OK) {
		ndev->nci_ver = rsp->nci_ver;
		pr_debug("nci_ver 0x%x, config_status 0x%x\n",
			 rsp->nci_ver, rsp->config_status);
	}

	nci_req_complete(ndev, rsp->status);
}

static void nci_core_init_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nci_core_init_rsp_1 *rsp_1 = (void *) skb->data;
	struct nci_core_init_rsp_2 *rsp_2;

	pr_debug("status 0x%x\n", rsp_1->status);

	if (rsp_1->status != NCI_STATUS_OK)
		goto exit;

	ndev->nfcc_features = __le32_to_cpu(rsp_1->nfcc_features);
	ndev->num_supported_rf_interfaces = rsp_1->num_supported_rf_interfaces;

	if (ndev->num_supported_rf_interfaces >
	    NCI_MAX_SUPPORTED_RF_INTERFACES) {
		ndev->num_supported_rf_interfaces =
			NCI_MAX_SUPPORTED_RF_INTERFACES;
	}

	memcpy(ndev->supported_rf_interfaces,
	       rsp_1->supported_rf_interfaces,
	       ndev->num_supported_rf_interfaces);

	rsp_2 = (void *) (skb->data + 6 + rsp_1->num_supported_rf_interfaces);

	ndev->max_logical_connections = rsp_2->max_logical_connections;
	ndev->max_routing_table_size =
		__le16_to_cpu(rsp_2->max_routing_table_size);
	ndev->max_ctrl_pkt_payload_len =
		rsp_2->max_ctrl_pkt_payload_len;
	ndev->max_size_for_large_params =
		__le16_to_cpu(rsp_2->max_size_for_large_params);
	ndev->manufact_id =
		rsp_2->manufact_id;
	ndev->manufact_specific_info =
		__le32_to_cpu(rsp_2->manufact_specific_info);

	pr_debug("nfcc_features 0x%x\n",
		 ndev->nfcc_features);
	pr_debug("num_supported_rf_interfaces %d\n",
		 ndev->num_supported_rf_interfaces);
	pr_debug("supported_rf_interfaces[0] 0x%x\n",
		 ndev->supported_rf_interfaces[0]);
	pr_debug("supported_rf_interfaces[1] 0x%x\n",
		 ndev->supported_rf_interfaces[1]);
	pr_debug("supported_rf_interfaces[2] 0x%x\n",
		 ndev->supported_rf_interfaces[2]);
	pr_debug("supported_rf_interfaces[3] 0x%x\n",
		 ndev->supported_rf_interfaces[3]);
	pr_debug("max_logical_connections %d\n",
		 ndev->max_logical_connections);
	pr_debug("max_routing_table_size %d\n",
		 ndev->max_routing_table_size);
	pr_debug("max_ctrl_pkt_payload_len %d\n",
		 ndev->max_ctrl_pkt_payload_len);
	pr_debug("max_size_for_large_params %d\n",
		 ndev->max_size_for_large_params);
	pr_debug("manufact_id 0x%x\n",
		 ndev->manufact_id);
	pr_debug("manufact_specific_info 0x%x\n",
		 ndev->manufact_specific_info);

exit:
	nci_req_complete(ndev, rsp_1->status);
}

static void nci_core_set_config_rsp_packet(struct nci_dev *ndev,
					   struct sk_buff *skb)
{
	struct nci_core_set_config_rsp *rsp = (void *) skb->data;

	pr_debug("status 0x%x\n", rsp->status);

	nci_req_complete(ndev, rsp->status);
}

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

	pr_debug("status 0x%x\n", status);

	nci_req_complete(ndev, status);
}

static void nci_rf_disc_rsp_packet(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nci_conn_info    *conn_info;
	__u8 status = skb->data[0];

	pr_debug("status 0x%x\n", status);

	if (status == NCI_STATUS_OK) {
		atomic_set(&ndev->state, NCI_DISCOVERY);

		conn_info = ndev->rf_conn_info;
		if (!conn_info) {
			conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
						 sizeof(struct nci_conn_info),
						 GFP_KERNEL);
			if (!conn_info) {
				status = NCI_STATUS_REJECTED;
				goto exit;
			}
			conn_info->conn_id = NCI_STATIC_RF_CONN_ID;
			INIT_LIST_HEAD(&conn_info->list);
			list_add(&conn_info->list, &ndev->conn_info_list);
			ndev->rf_conn_info = conn_info;
		}
	}

exit:
	nci_req_complete(ndev, status);
}

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

	pr_debug("status 0x%x\n", status);

	/* Complete the request on intf_activated_ntf or generic_error_ntf */
	if (status != NCI_STATUS_OK)
		nci_req_complete(ndev, status);
}

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

	pr_debug("status 0x%x\n", status);

	/* If target was active, complete the request only in deactivate_ntf */
	if ((status != NCI_STATUS_OK) ||
	    (atomic_read(&ndev->state) != NCI_POLL_ACTIVE)) {
		nci_clear_target_list(ndev);
		atomic_set(&ndev->state, NCI_IDLE);
		nci_req_complete(ndev, status);
	}
}

static void nci_nfcee_discover_rsp_packet(struct nci_dev *ndev,
					  struct sk_buff *skb)
{
	struct nci_nfcee_discover_rsp *discover_rsp;

	if (skb->len != 2) {
		nci_req_complete(ndev, NCI_STATUS_NFCEE_PROTOCOL_ERROR);
		return;
	}

	discover_rsp = (struct nci_nfcee_discover_rsp *)skb->data;

	if (discover_rsp->status != NCI_STATUS_OK ||
	    discover_rsp->num_nfcee == 0)
		nci_req_complete(ndev, discover_rsp->status);
}

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

	pr_debug("status 0x%x\n", status);
	nci_req_complete(ndev, status);
}

static void nci_core_conn_create_rsp_packet(struct nci_dev *ndev,
					    struct sk_buff *skb)
{
	__u8 status = skb->data[0];
	struct nci_conn_info *conn_info;
	struct nci_core_conn_create_rsp *rsp;

	pr_debug("status 0x%x\n", status);

	if (status == NCI_STATUS_OK) {
		rsp = (struct nci_core_conn_create_rsp *)skb->data;

		conn_info = devm_kzalloc(&ndev->nfc_dev->dev,
					 sizeof(*conn_info), GFP_KERNEL);
		if (!conn_info) {
			status = NCI_STATUS_REJECTED;
			goto exit;
		}

		conn_info->id = ndev->cur_id;
		conn_info->conn_id = rsp->conn_id;

		/* Note: data_exchange_cb and data_exchange_cb_context need to
		 * be specify out of nci_core_conn_create_rsp_packet
		 */

		INIT_LIST_HEAD(&conn_info->list);
		list_add(&conn_info->list, &ndev->conn_info_list);

		if (ndev->cur_id == ndev->hci_dev->nfcee_id)
			ndev->hci_dev->conn_info = conn_info;

		conn_info->conn_id = rsp->conn_id;
		conn_info->max_pkt_payload_len = rsp->max_ctrl_pkt_payload_len;
		atomic_set(&conn_info->credits_cnt, rsp->credits_cnt);
	}

exit:
	nci_req_complete(ndev, status);
}

static void nci_core_conn_close_rsp_packet(struct nci_dev *ndev,
					   struct sk_buff *skb)
{
	struct nci_conn_info *conn_info;
	__u8 status = skb->data[0];

	pr_debug("status 0x%x\n", status);
	if (status == NCI_STATUS_OK) {
		conn_info = nci_get_conn_info_by_conn_id(ndev,
							 ndev->cur_conn_id);
		if (conn_info) {
			list_del(&conn_info->list);
			devm_kfree(&ndev->nfc_dev->dev, conn_info);
		}
	}
	nci_req_complete(ndev, status);
}

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

	/* we got a rsp, stop the cmd timer */
	del_timer(&ndev->cmd_timer);

	pr_debug("NCI RX: MT=rsp, PBF=%d, GID=0x%x, OID=0x%x, plen=%d\n",
		 nci_pbf(skb->data),
		 nci_opcode_gid(rsp_opcode),
		 nci_opcode_oid(rsp_opcode),
		 nci_plen(skb->data));

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

	if (nci_opcode_gid(rsp_opcode) == NCI_GID_PROPRIETARY) {
		if (nci_prop_rsp_packet(ndev, rsp_opcode, skb) == -ENOTSUPP) {
			pr_err("unsupported rsp opcode 0x%x\n",
			       rsp_opcode);
		}

		goto end;
	}

	switch (rsp_opcode) {
	case NCI_OP_CORE_RESET_RSP:
		nci_core_reset_rsp_packet(ndev, skb);
		break;

	case NCI_OP_CORE_INIT_RSP:
		nci_core_init_rsp_packet(ndev, skb);
		break;

	case NCI_OP_CORE_SET_CONFIG_RSP:
		nci_core_set_config_rsp_packet(ndev, skb);
		break;

	case NCI_OP_CORE_CONN_CREATE_RSP:
		nci_core_conn_create_rsp_packet(ndev, skb);
		break;

	case NCI_OP_CORE_CONN_CLOSE_RSP:
		nci_core_conn_close_rsp_packet(ndev, skb);
		break;

	case NCI_OP_RF_DISCOVER_MAP_RSP:
		nci_rf_disc_map_rsp_packet(ndev, skb);
		break;

	case NCI_OP_RF_DISCOVER_RSP:
		nci_rf_disc_rsp_packet(ndev, skb);
		break;

	case NCI_OP_RF_DISCOVER_SELECT_RSP:
		nci_rf_disc_select_rsp_packet(ndev, skb);
		break;

	case NCI_OP_RF_DEACTIVATE_RSP:
		nci_rf_deactivate_rsp_packet(ndev, skb);
		break;

	case NCI_OP_NFCEE_DISCOVER_RSP:
		nci_nfcee_discover_rsp_packet(ndev, skb);
		break;

	case NCI_OP_NFCEE_MODE_SET_RSP:
		nci_nfcee_mode_set_rsp_packet(ndev, skb);
		break;

	default:
		pr_err("unknown rsp opcode 0x%x\n", rsp_opcode);
		break;
	}

	nci_core_rsp_packet(ndev, rsp_opcode, skb);
end:
	kfree_skb(skb);

	/* trigger the next cmd */
	atomic_set(&ndev->cmd_cnt, 1);
	if (!skb_queue_empty(&ndev->cmd_q))
		queue_work(ndev->cmd_wq, &ndev->cmd_work);
}