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authorEric Lapuyade <eric.lapuyade@intel.com>2012-04-10 13:43:06 -0400
committerJohn W. Linville <linville@tuxdriver.com>2012-04-12 15:10:34 -0400
commit8b8d2e08bf0d50193931afd27482a59376b66b2b (patch)
tree7752d914ca7d89f2f2c00159bb718a53d9980139 /net
parente1da0efa2ee71df957b280bcfa41f82ce6986a1d (diff)
NFC: HCI support
This is an implementation of ETSI TS 102 622 specification. Many NFC chipsets use HCI as the host <-> target protocol on top of a serial link like i2c. Signed-off-by: Eric Lapuyade <eric.lapuyade@intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/nfc/Kconfig1
-rw-r--r--net/nfc/Makefile1
-rw-r--r--net/nfc/hci/Kconfig8
-rw-r--r--net/nfc/hci/Makefile7
-rw-r--r--net/nfc/hci/command.c354
-rw-r--r--net/nfc/hci/core.c830
-rw-r--r--net/nfc/hci/hci.h139
-rw-r--r--net/nfc/hci/hcp.c156
8 files changed, 1496 insertions, 0 deletions
diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig
index 44c865b86d6f..8d8d9bc4b6ff 100644
--- a/net/nfc/Kconfig
+++ b/net/nfc/Kconfig
@@ -14,6 +14,7 @@ menuconfig NFC
14 be called nfc. 14 be called nfc.
15 15
16source "net/nfc/nci/Kconfig" 16source "net/nfc/nci/Kconfig"
17source "net/nfc/hci/Kconfig"
17source "net/nfc/llcp/Kconfig" 18source "net/nfc/llcp/Kconfig"
18 19
19source "drivers/nfc/Kconfig" 20source "drivers/nfc/Kconfig"
diff --git a/net/nfc/Makefile b/net/nfc/Makefile
index 7b4a6dcfa566..d1a117c2c401 100644
--- a/net/nfc/Makefile
+++ b/net/nfc/Makefile
@@ -4,6 +4,7 @@
4 4
5obj-$(CONFIG_NFC) += nfc.o 5obj-$(CONFIG_NFC) += nfc.o
6obj-$(CONFIG_NFC_NCI) += nci/ 6obj-$(CONFIG_NFC_NCI) += nci/
7obj-$(CONFIG_NFC_HCI) += hci/
7 8
8nfc-objs := core.o netlink.o af_nfc.o rawsock.o 9nfc-objs := core.o netlink.o af_nfc.o rawsock.o
9nfc-$(CONFIG_NFC_LLCP) += llcp/llcp.o llcp/commands.o llcp/sock.o 10nfc-$(CONFIG_NFC_LLCP) += llcp/llcp.o llcp/commands.o llcp/sock.o
diff --git a/net/nfc/hci/Kconfig b/net/nfc/hci/Kconfig
new file mode 100644
index 000000000000..c32d2d4a9635
--- /dev/null
+++ b/net/nfc/hci/Kconfig
@@ -0,0 +1,8 @@
1config NFC_HCI
2 depends on NFC
3 tristate "NFC HCI implementation"
4 default n
5 help
6 Say Y here if you want to build support for a kernel NFC HCI
7 implementation. This is mostly needed for devices that only process
8 HCI frames, like for example the NXP pn544.
diff --git a/net/nfc/hci/Makefile b/net/nfc/hci/Makefile
new file mode 100644
index 000000000000..af17c7be051a
--- /dev/null
+++ b/net/nfc/hci/Makefile
@@ -0,0 +1,7 @@
1#
2# Makefile for the Linux NFC HCI layer.
3#
4
5obj-$(CONFIG_NFC_HCI) += hci.o
6
7hci-y := core.o hcp.o command.o
diff --git a/net/nfc/hci/command.c b/net/nfc/hci/command.c
new file mode 100644
index 000000000000..8729abf5f18b
--- /dev/null
+++ b/net/nfc/hci/command.c
@@ -0,0 +1,354 @@
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/sched.h>
25#include <linux/module.h>
26
27#include <net/nfc/hci.h>
28
29#include "hci.h"
30
31static int nfc_hci_result_to_errno(u8 result)
32{
33 switch (result) {
34 case NFC_HCI_ANY_OK:
35 return 0;
36 case NFC_HCI_ANY_E_TIMEOUT:
37 return -ETIMEDOUT;
38 default:
39 return -1;
40 }
41}
42
43static void nfc_hci_execute_cb(struct nfc_hci_dev *hdev, u8 result,
44 struct sk_buff *skb, void *cb_data)
45{
46 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)cb_data;
47
48 pr_debug("HCI Cmd completed with HCI result=%d\n", result);
49
50 hcp_ew->exec_result = nfc_hci_result_to_errno(result);
51 if (hcp_ew->exec_result == 0)
52 hcp_ew->result_skb = skb;
53 else
54 kfree_skb(skb);
55 hcp_ew->exec_complete = true;
56
57 wake_up(hcp_ew->wq);
58}
59
60static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
61 const u8 *param, size_t param_len,
62 struct sk_buff **skb)
63{
64 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
65 struct hcp_exec_waiter hcp_ew;
66 hcp_ew.wq = &ew_wq;
67 hcp_ew.exec_complete = false;
68 hcp_ew.result_skb = NULL;
69
70 pr_debug("through pipe=%d, cmd=%d, plen=%zd\n", pipe, cmd, param_len);
71
72 /* TODO: Define hci cmd execution delay. Should it be the same
73 * for all commands?
74 */
75 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
76 NFC_HCI_HCP_COMMAND, cmd,
77 param, param_len,
78 nfc_hci_execute_cb, &hcp_ew,
79 3000);
80 if (hcp_ew.exec_result < 0)
81 return hcp_ew.exec_result;
82
83 wait_event(ew_wq, hcp_ew.exec_complete == true);
84
85 if (hcp_ew.exec_result == 0) {
86 if (skb)
87 *skb = hcp_ew.result_skb;
88 else
89 kfree_skb(hcp_ew.result_skb);
90 }
91
92 return hcp_ew.exec_result;
93}
94
95int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
96 const u8 *param, size_t param_len)
97{
98 u8 pipe;
99
100 pr_debug("%d to gate %d\n", event, gate);
101
102 pipe = hdev->gate2pipe[gate];
103 if (pipe == NFC_HCI_INVALID_PIPE)
104 return -EADDRNOTAVAIL;
105
106 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
107 param, param_len, NULL, NULL, 0);
108}
109EXPORT_SYMBOL(nfc_hci_send_event);
110
111int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
112 const u8 *param, size_t param_len)
113{
114 u8 pipe;
115
116 pr_debug("\n");
117
118 pipe = hdev->gate2pipe[gate];
119 if (pipe == NFC_HCI_INVALID_PIPE)
120 return -EADDRNOTAVAIL;
121
122 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
123 response, param, param_len, NULL, NULL,
124 0);
125}
126EXPORT_SYMBOL(nfc_hci_send_response);
127
128/*
129 * Execute an hci command sent to gate.
130 * skb will contain response data if success. skb can be NULL if you are not
131 * interested by the response.
132 */
133int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
134 const u8 *param, size_t param_len, struct sk_buff **skb)
135{
136 u8 pipe;
137
138 pr_debug("\n");
139
140 pipe = hdev->gate2pipe[gate];
141 if (pipe == NFC_HCI_INVALID_PIPE)
142 return -EADDRNOTAVAIL;
143
144 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
145}
146EXPORT_SYMBOL(nfc_hci_send_cmd);
147
148int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
149 const u8 *param, size_t param_len)
150{
151 int r;
152 u8 *tmp;
153
154 /* TODO ELa: reg idx must be inserted before param, but we don't want
155 * to ask the caller to do it to keep a simpler API.
156 * For now, just create a new temporary param buffer. This is far from
157 * optimal though, and the plan is to modify APIs to pass idx down to
158 * nfc_hci_hcp_message_tx where the frame is actually built, thereby
159 * eliminating the need for the temp allocation-copy here.
160 */
161
162 pr_debug("idx=%d to gate %d\n", idx, gate);
163
164 tmp = kmalloc(1 + param_len, GFP_KERNEL);
165 if (tmp == NULL)
166 return -ENOMEM;
167
168 *tmp = idx;
169 memcpy(tmp + 1, param, param_len);
170
171 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
172 tmp, param_len + 1, NULL);
173
174 kfree(tmp);
175
176 return r;
177}
178EXPORT_SYMBOL(nfc_hci_set_param);
179
180int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
181 struct sk_buff **skb)
182{
183 pr_debug("gate=%d regidx=%d\n", gate, idx);
184
185 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
186 &idx, 1, skb);
187}
188EXPORT_SYMBOL(nfc_hci_get_param);
189
190static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
191{
192 struct sk_buff *skb;
193 int r;
194
195 pr_debug("pipe=%d\n", pipe);
196
197 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
198 NULL, 0, &skb);
199 if (r == 0) {
200 /* dest host other than host controller will send
201 * number of pipes already open on this gate before
202 * execution. The number can be found in skb->data[0]
203 */
204 kfree_skb(skb);
205 }
206
207 return r;
208}
209
210static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
211{
212 pr_debug("\n");
213
214 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
215 NULL, 0, NULL);
216}
217
218static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
219 u8 dest_gate, int *result)
220{
221 struct sk_buff *skb;
222 struct hci_create_pipe_params params;
223 struct hci_create_pipe_resp *resp;
224 u8 pipe;
225
226 pr_debug("gate=%d\n", dest_gate);
227
228 params.src_gate = NFC_HCI_ADMIN_GATE;
229 params.dest_host = dest_host;
230 params.dest_gate = dest_gate;
231
232 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
233 NFC_HCI_ADM_CREATE_PIPE,
234 (u8 *) &params, sizeof(params), &skb);
235 if (*result == 0) {
236 resp = (struct hci_create_pipe_resp *)skb->data;
237 pipe = resp->pipe;
238 kfree_skb(skb);
239
240 pr_debug("pipe created=%d\n", pipe);
241
242 return pipe;
243 } else
244 return NFC_HCI_INVALID_PIPE;
245}
246
247static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
248{
249 pr_debug("\n");
250
251 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
252 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
253}
254
255static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
256{
257 int r;
258
259 u8 param[2];
260
261 /* TODO: Find out what the identity reference data is
262 * and fill param with it. HCI spec 6.1.3.5 */
263
264 pr_debug("\n");
265
266 r = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
267 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, 2, NULL);
268
269 return 0;
270}
271
272int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
273{
274 int r;
275 u8 pipe = hdev->gate2pipe[gate];
276
277 pr_debug("\n");
278
279 if (pipe == NFC_HCI_INVALID_PIPE)
280 return -EADDRNOTAVAIL;
281
282 r = nfc_hci_close_pipe(hdev, pipe);
283 if (r < 0)
284 return r;
285
286 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
287 r = nfc_hci_delete_pipe(hdev, pipe);
288 if (r < 0)
289 return r;
290 }
291
292 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
293
294 return 0;
295}
296EXPORT_SYMBOL(nfc_hci_disconnect_gate);
297
298int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
299{
300 int r;
301
302 pr_debug("\n");
303
304 r = nfc_hci_clear_all_pipes(hdev);
305 if (r < 0)
306 return r;
307
308 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
309
310 return 0;
311}
312EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
313
314int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate)
315{
316 u8 pipe = NFC_HCI_INVALID_PIPE;
317 bool pipe_created = false;
318 int r;
319
320 pr_debug("\n");
321
322 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
323 return -EADDRINUSE;
324
325 switch (dest_gate) {
326 case NFC_HCI_LINK_MGMT_GATE:
327 pipe = NFC_HCI_LINK_MGMT_PIPE;
328 break;
329 case NFC_HCI_ADMIN_GATE:
330 pipe = NFC_HCI_ADMIN_PIPE;
331 break;
332 default:
333 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
334 if (pipe == NFC_HCI_INVALID_PIPE)
335 return r;
336 pipe_created = true;
337 break;
338 }
339
340 r = nfc_hci_open_pipe(hdev, pipe);
341 if (r < 0) {
342 if (pipe_created)
343 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
344 /* TODO: Cannot clean by deleting pipe...
345 * -> inconsistent state */
346 }
347 return r;
348 }
349
350 hdev->gate2pipe[dest_gate] = pipe;
351
352 return 0;
353}
354EXPORT_SYMBOL(nfc_hci_connect_gate);
diff --git a/net/nfc/hci/core.c b/net/nfc/hci/core.c
new file mode 100644
index 000000000000..86fd00d5a099
--- /dev/null
+++ b/net/nfc/hci/core.c
@@ -0,0 +1,830 @@
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/nfc.h>
26
27#include <net/nfc/nfc.h>
28#include <net/nfc/hci.h>
29
30#include "hci.h"
31
32/* Largest headroom needed for outgoing HCI commands */
33#define HCI_CMDS_HEADROOM 1
34
35static void nfc_hci_msg_tx_work(struct work_struct *work)
36{
37 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
38 msg_tx_work);
39 struct hci_msg *msg;
40 struct sk_buff *skb;
41 int r = 0;
42
43 mutex_lock(&hdev->msg_tx_mutex);
44
45 if (hdev->cmd_pending_msg) {
46 if (timer_pending(&hdev->cmd_timer) == 0) {
47 if (hdev->cmd_pending_msg->cb)
48 hdev->cmd_pending_msg->cb(hdev,
49 NFC_HCI_ANY_E_TIMEOUT,
50 NULL,
51 hdev->
52 cmd_pending_msg->
53 cb_context);
54 kfree(hdev->cmd_pending_msg);
55 hdev->cmd_pending_msg = NULL;
56 } else
57 goto exit;
58 }
59
60next_msg:
61 if (list_empty(&hdev->msg_tx_queue))
62 goto exit;
63
64 msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg, msg_l);
65 list_del(&msg->msg_l);
66
67 pr_debug("msg_tx_queue has a cmd to send\n");
68 while ((skb = skb_dequeue(&msg->msg_frags)) != NULL) {
69 r = hdev->ops->xmit(hdev, skb);
70 if (r < 0) {
71 kfree_skb(skb);
72 skb_queue_purge(&msg->msg_frags);
73 if (msg->cb)
74 msg->cb(hdev, NFC_HCI_ANY_E_NOK, NULL,
75 msg->cb_context);
76 kfree(msg);
77 break;
78 }
79 }
80
81 if (r)
82 goto next_msg;
83
84 if (msg->wait_response == false) {
85 kfree(msg);
86 goto next_msg;
87 }
88
89 hdev->cmd_pending_msg = msg;
90 mod_timer(&hdev->cmd_timer, jiffies +
91 msecs_to_jiffies(hdev->cmd_pending_msg->completion_delay));
92
93exit:
94 mutex_unlock(&hdev->msg_tx_mutex);
95}
96
97static void nfc_hci_msg_rx_work(struct work_struct *work)
98{
99 struct nfc_hci_dev *hdev = container_of(work, struct nfc_hci_dev,
100 msg_rx_work);
101 struct sk_buff *skb;
102 struct hcp_message *message;
103 u8 pipe;
104 u8 type;
105 u8 instruction;
106
107 while ((skb = skb_dequeue(&hdev->msg_rx_queue)) != NULL) {
108 pipe = skb->data[0];
109 skb_pull(skb, NFC_HCI_HCP_PACKET_HEADER_LEN);
110 message = (struct hcp_message *)skb->data;
111 type = HCP_MSG_GET_TYPE(message->header);
112 instruction = HCP_MSG_GET_CMD(message->header);
113 skb_pull(skb, NFC_HCI_HCP_MESSAGE_HEADER_LEN);
114
115 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, skb);
116 }
117}
118
119void nfc_hci_resp_received(struct nfc_hci_dev *hdev, u8 result,
120 struct sk_buff *skb)
121{
122 mutex_lock(&hdev->msg_tx_mutex);
123
124 if (hdev->cmd_pending_msg == NULL) {
125 kfree_skb(skb);
126 goto exit;
127 }
128
129 del_timer_sync(&hdev->cmd_timer);
130
131 if (hdev->cmd_pending_msg->cb)
132 hdev->cmd_pending_msg->cb(hdev, result, skb,
133 hdev->cmd_pending_msg->cb_context);
134 else
135 kfree_skb(skb);
136
137 kfree(hdev->cmd_pending_msg);
138 hdev->cmd_pending_msg = NULL;
139
140 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
141
142exit:
143 mutex_unlock(&hdev->msg_tx_mutex);
144}
145
146void nfc_hci_cmd_received(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
147 struct sk_buff *skb)
148{
149 kfree_skb(skb);
150}
151
152static u32 nfc_hci_sak_to_protocol(u8 sak)
153{
154 switch (NFC_HCI_TYPE_A_SEL_PROT(sak)) {
155 case NFC_HCI_TYPE_A_SEL_PROT_MIFARE:
156 return NFC_PROTO_MIFARE_MASK;
157 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443:
158 return NFC_PROTO_ISO14443_MASK;
159 case NFC_HCI_TYPE_A_SEL_PROT_DEP:
160 return NFC_PROTO_NFC_DEP_MASK;
161 case NFC_HCI_TYPE_A_SEL_PROT_ISO14443_DEP:
162 return NFC_PROTO_ISO14443_MASK | NFC_PROTO_NFC_DEP_MASK;
163 default:
164 return 0xffffffff;
165 }
166}
167
168static int nfc_hci_target_discovered(struct nfc_hci_dev *hdev, u8 gate)
169{
170 struct nfc_target *targets;
171 struct sk_buff *atqa_skb = NULL;
172 struct sk_buff *sak_skb = NULL;
173 int r;
174
175 pr_debug("from gate %d\n", gate);
176
177 targets = kzalloc(sizeof(struct nfc_target), GFP_KERNEL);
178 if (targets == NULL)
179 return -ENOMEM;
180
181 switch (gate) {
182 case NFC_HCI_RF_READER_A_GATE:
183 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
184 NFC_HCI_RF_READER_A_ATQA, &atqa_skb);
185 if (r < 0)
186 goto exit;
187
188 r = nfc_hci_get_param(hdev, NFC_HCI_RF_READER_A_GATE,
189 NFC_HCI_RF_READER_A_SAK, &sak_skb);
190 if (r < 0)
191 goto exit;
192
193 if (atqa_skb->len != 2 || sak_skb->len != 1) {
194 r = -EPROTO;
195 goto exit;
196 }
197
198 targets->supported_protocols =
199 nfc_hci_sak_to_protocol(sak_skb->data[0]);
200 if (targets->supported_protocols == 0xffffffff) {
201 r = -EPROTO;
202 goto exit;
203 }
204
205 targets->sens_res = be16_to_cpu(*(u16 *)atqa_skb->data);
206 targets->sel_res = sak_skb->data[0];
207
208 if (hdev->ops->complete_target_discovered) {
209 r = hdev->ops->complete_target_discovered(hdev, gate,
210 targets);
211 if (r < 0)
212 goto exit;
213 }
214 break;
215 case NFC_HCI_RF_READER_B_GATE:
216 targets->supported_protocols = NFC_PROTO_ISO14443_MASK;
217 break;
218 default:
219 if (hdev->ops->target_from_gate)
220 r = hdev->ops->target_from_gate(hdev, gate, targets);
221 else
222 r = -EPROTO;
223 if (r < 0)
224 goto exit;
225
226 if (hdev->ops->complete_target_discovered) {
227 r = hdev->ops->complete_target_discovered(hdev, gate,
228 targets);
229 if (r < 0)
230 goto exit;
231 }
232 break;
233 }
234
235 targets->hci_reader_gate = gate;
236
237 r = nfc_targets_found(hdev->ndev, targets, 1);
238 if (r < 0)
239 goto exit;
240
241 kfree(hdev->targets);
242 hdev->targets = targets;
243 targets = NULL;
244 hdev->target_count = 1;
245
246exit:
247 kfree(targets);
248 kfree_skb(atqa_skb);
249 kfree_skb(sak_skb);
250
251 return r;
252}
253
254void nfc_hci_event_received(struct nfc_hci_dev *hdev, u8 pipe, u8 event,
255 struct sk_buff *skb)
256{
257 int r = 0;
258
259 switch (event) {
260 case NFC_HCI_EVT_TARGET_DISCOVERED:
261 if (hdev->poll_started == false) {
262 r = -EPROTO;
263 goto exit;
264 }
265
266 if (skb->len < 1) { /* no status data? */
267 r = -EPROTO;
268 goto exit;
269 }
270
271 if (skb->data[0] == 3) {
272 /* TODO: Multiple targets in field, none activated
273 * poll is supposedly stopped, but there is no
274 * single target to activate, so nothing to report
275 * up.
276 * if we need to restart poll, we must save the
277 * protocols from the initial poll and reuse here.
278 */
279 }
280
281 if (skb->data[0] != 0) {
282 r = -EPROTO;
283 goto exit;
284 }
285
286 r = nfc_hci_target_discovered(hdev,
287 nfc_hci_pipe2gate(hdev, pipe));
288 break;
289 default:
290 /* TODO: Unknown events are hardware specific
291 * pass them to the driver (needs a new hci_ops) */
292 break;
293 }
294
295exit:
296 kfree_skb(skb);
297
298 if (r) {
299 /* TODO: There was an error dispatching the event,
300 * how to propagate up to nfc core?
301 */
302 }
303}
304
305static void nfc_hci_cmd_timeout(unsigned long data)
306{
307 struct nfc_hci_dev *hdev = (struct nfc_hci_dev *)data;
308
309 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
310}
311
312static int hci_dev_connect_gates(struct nfc_hci_dev *hdev, u8 gate_count,
313 u8 gates[])
314{
315 int r;
316 u8 *p = gates;
317 while (gate_count--) {
318 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID, *p);
319 if (r < 0)
320 return r;
321 p++;
322 }
323
324 return 0;
325}
326
327static int hci_dev_session_init(struct nfc_hci_dev *hdev)
328{
329 struct sk_buff *skb = NULL;
330 int r;
331 u8 hci_gates[] = { /* NFC_HCI_ADMIN_GATE MUST be first */
332 NFC_HCI_ADMIN_GATE, NFC_HCI_LOOPBACK_GATE,
333 NFC_HCI_ID_MGMT_GATE, NFC_HCI_LINK_MGMT_GATE,
334 NFC_HCI_RF_READER_B_GATE, NFC_HCI_RF_READER_A_GATE
335 };
336
337 r = nfc_hci_connect_gate(hdev, NFC_HCI_HOST_CONTROLLER_ID,
338 NFC_HCI_ADMIN_GATE);
339 if (r < 0)
340 goto exit;
341
342 r = nfc_hci_get_param(hdev, NFC_HCI_ADMIN_GATE,
343 NFC_HCI_ADMIN_SESSION_IDENTITY, &skb);
344 if (r < 0)
345 goto disconnect_all;
346
347 if (skb->len && skb->len == strlen(hdev->init_data.session_id))
348 if (memcmp(hdev->init_data.session_id, skb->data,
349 skb->len) == 0) {
350 /* TODO ELa: restore gate<->pipe table from
351 * some TBD location.
352 * note: it doesn't seem possible to get the chip
353 * currently open gate/pipe table.
354 * It is only possible to obtain the supported
355 * gate list.
356 */
357
358 /* goto exit
359 * For now, always do a full initialization */
360 }
361
362 r = nfc_hci_disconnect_all_gates(hdev);
363 if (r < 0)
364 goto exit;
365
366 r = hci_dev_connect_gates(hdev, sizeof(hci_gates), hci_gates);
367 if (r < 0)
368 goto disconnect_all;
369
370 r = hci_dev_connect_gates(hdev, hdev->init_data.gate_count,
371 hdev->init_data.gates);
372 if (r < 0)
373 goto disconnect_all;
374
375 r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
376 NFC_HCI_ADMIN_SESSION_IDENTITY,
377 hdev->init_data.session_id,
378 strlen(hdev->init_data.session_id));
379 if (r == 0)
380 goto exit;
381
382disconnect_all:
383 nfc_hci_disconnect_all_gates(hdev);
384
385exit:
386 if (skb)
387 kfree_skb(skb);
388
389 return r;
390}
391
392static int hci_dev_version(struct nfc_hci_dev *hdev)
393{
394 int r;
395 struct sk_buff *skb;
396
397 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
398 NFC_HCI_ID_MGMT_VERSION_SW, &skb);
399 if (r < 0)
400 return r;
401
402 if (skb->len != 3) {
403 kfree_skb(skb);
404 return -EINVAL;
405 }
406
407 hdev->sw_romlib = (skb->data[0] & 0xf0) >> 4;
408 hdev->sw_patch = skb->data[0] & 0x0f;
409 hdev->sw_flashlib_major = skb->data[1];
410 hdev->sw_flashlib_minor = skb->data[2];
411
412 kfree_skb(skb);
413
414 r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
415 NFC_HCI_ID_MGMT_VERSION_HW, &skb);
416 if (r < 0)
417 return r;
418
419 if (skb->len != 3) {
420 kfree_skb(skb);
421 return -EINVAL;
422 }
423
424 hdev->hw_derivative = (skb->data[0] & 0xe0) >> 5;
425 hdev->hw_version = skb->data[0] & 0x1f;
426 hdev->hw_mpw = (skb->data[1] & 0xc0) >> 6;
427 hdev->hw_software = skb->data[1] & 0x3f;
428 hdev->hw_bsid = skb->data[2];
429
430 kfree_skb(skb);
431
432 pr_info("SOFTWARE INFO:\n");
433 pr_info("RomLib : %d\n", hdev->sw_romlib);
434 pr_info("Patch : %d\n", hdev->sw_patch);
435 pr_info("FlashLib Major : %d\n", hdev->sw_flashlib_major);
436 pr_info("FlashLib Minor : %d\n", hdev->sw_flashlib_minor);
437 pr_info("HARDWARE INFO:\n");
438 pr_info("Derivative : %d\n", hdev->hw_derivative);
439 pr_info("HW Version : %d\n", hdev->hw_version);
440 pr_info("#MPW : %d\n", hdev->hw_mpw);
441 pr_info("Software : %d\n", hdev->hw_software);
442 pr_info("BSID Version : %d\n", hdev->hw_bsid);
443
444 return 0;
445}
446
447static int hci_dev_up(struct nfc_dev *nfc_dev)
448{
449 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
450 int r = 0;
451
452 if (hdev->ops->open) {
453 r = hdev->ops->open(hdev);
454 if (r < 0)
455 return r;
456 }
457
458 r = hci_dev_session_init(hdev);
459 if (r < 0)
460 goto exit;
461
462 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
463 NFC_HCI_EVT_END_OPERATION, NULL, 0);
464 if (r < 0)
465 goto exit;
466
467 if (hdev->ops->hci_ready) {
468 r = hdev->ops->hci_ready(hdev);
469 if (r < 0)
470 goto exit;
471 }
472
473 r = hci_dev_version(hdev);
474 if (r < 0)
475 goto exit;
476
477exit:
478 if (r < 0)
479 if (hdev->ops->close)
480 hdev->ops->close(hdev);
481 return r;
482}
483
484static int hci_dev_down(struct nfc_dev *nfc_dev)
485{
486 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
487
488 if (hdev->ops->close)
489 hdev->ops->close(hdev);
490
491 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
492
493 return 0;
494}
495
496static int hci_start_poll(struct nfc_dev *nfc_dev, u32 protocols)
497{
498 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
499 int r;
500
501 if (hdev->ops->start_poll)
502 r = hdev->ops->start_poll(hdev, protocols);
503 else
504 r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
505 NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
506 if (r == 0)
507 hdev->poll_started = true;
508
509 return r;
510}
511
512static void hci_stop_poll(struct nfc_dev *nfc_dev)
513{
514 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
515
516 if (hdev->poll_started) {
517 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
518 NFC_HCI_EVT_END_OPERATION, NULL, 0);
519 hdev->poll_started = false;
520 }
521}
522
523static struct nfc_target *hci_find_target(struct nfc_hci_dev *hdev,
524 u32 target_idx)
525{
526 int i;
527 if (hdev->poll_started == false || hdev->targets == NULL)
528 return NULL;
529
530 for (i = 0; i < hdev->target_count; i++) {
531 if (hdev->targets[i].idx == target_idx)
532 return &hdev->targets[i];
533 }
534
535 return NULL;
536}
537
538static int hci_activate_target(struct nfc_dev *nfc_dev, u32 target_idx,
539 u32 protocol)
540{
541 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
542
543 if (hci_find_target(hdev, target_idx) == NULL)
544 return -ENOMEDIUM;
545
546 return 0;
547}
548
549static void hci_deactivate_target(struct nfc_dev *nfc_dev, u32 target_idx)
550{
551}
552
553static int hci_data_exchange(struct nfc_dev *nfc_dev, u32 target_idx,
554 struct sk_buff *skb, data_exchange_cb_t cb,
555 void *cb_context)
556{
557 struct nfc_hci_dev *hdev = nfc_get_drvdata(nfc_dev);
558 int r;
559 struct nfc_target *target;
560 struct sk_buff *res_skb = NULL;
561
562 pr_debug("target_idx=%d\n", target_idx);
563
564 target = hci_find_target(hdev, target_idx);
565 if (target == NULL)
566 return -ENOMEDIUM;
567
568 switch (target->hci_reader_gate) {
569 case NFC_HCI_RF_READER_A_GATE:
570 case NFC_HCI_RF_READER_B_GATE:
571 if (hdev->ops->data_exchange) {
572 r = hdev->ops->data_exchange(hdev, target, skb,
573 &res_skb);
574 if (r <= 0) /* handled */
575 break;
576 }
577
578 *skb_push(skb, 1) = 0; /* CTR, see spec:10.2.2.1 */
579 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
580 NFC_HCI_WR_XCHG_DATA,
581 skb->data, skb->len, &res_skb);
582 /*
583 * TODO: Check RF Error indicator to make sure data is valid.
584 * It seems that HCI cmd can complete without error, but data
585 * can be invalid if an RF error occured? Ignore for now.
586 */
587 if (r == 0)
588 skb_trim(res_skb, res_skb->len - 1); /* RF Err ind */
589 break;
590 default:
591 if (hdev->ops->data_exchange) {
592 r = hdev->ops->data_exchange(hdev, target, skb,
593 &res_skb);
594 if (r == 1)
595 r = -ENOTSUPP;
596 }
597 else
598 r = -ENOTSUPP;
599 }
600
601 kfree_skb(skb);
602
603 cb(cb_context, res_skb, r);
604
605 return 0;
606}
607
608struct nfc_ops hci_nfc_ops = {
609 .dev_up = hci_dev_up,
610 .dev_down = hci_dev_down,
611 .start_poll = hci_start_poll,
612 .stop_poll = hci_stop_poll,
613 .activate_target = hci_activate_target,
614 .deactivate_target = hci_deactivate_target,
615 .data_exchange = hci_data_exchange,
616};
617
618struct nfc_hci_dev *nfc_hci_allocate_device(struct nfc_hci_ops *ops,
619 struct nfc_hci_init_data *init_data,
620 u32 protocols,
621 int tx_headroom,
622 int tx_tailroom,
623 int max_link_payload)
624{
625 struct nfc_hci_dev *hdev;
626
627 if (ops->xmit == NULL)
628 return NULL;
629
630 if (protocols == 0)
631 return NULL;
632
633 hdev = kzalloc(sizeof(struct nfc_hci_dev), GFP_KERNEL);
634 if (hdev == NULL)
635 return NULL;
636
637 hdev->ndev = nfc_allocate_device(&hci_nfc_ops, protocols,
638 tx_headroom + HCI_CMDS_HEADROOM,
639 tx_tailroom);
640 if (!hdev->ndev) {
641 kfree(hdev);
642 return NULL;
643 }
644
645 hdev->ops = ops;
646 hdev->max_data_link_payload = max_link_payload;
647 hdev->init_data = *init_data;
648
649 nfc_set_drvdata(hdev->ndev, hdev);
650
651 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
652
653 return hdev;
654}
655EXPORT_SYMBOL(nfc_hci_allocate_device);
656
657void nfc_hci_free_device(struct nfc_hci_dev *hdev)
658{
659 nfc_free_device(hdev->ndev);
660 kfree(hdev);
661}
662EXPORT_SYMBOL(nfc_hci_free_device);
663
664int nfc_hci_register_device(struct nfc_hci_dev *hdev)
665{
666 struct device *dev = &hdev->ndev->dev;
667 const char *devname = dev_name(dev);
668 char name[32];
669 int r = 0;
670
671 mutex_init(&hdev->msg_tx_mutex);
672
673 INIT_LIST_HEAD(&hdev->msg_tx_queue);
674
675 INIT_WORK(&hdev->msg_tx_work, nfc_hci_msg_tx_work);
676 snprintf(name, sizeof(name), "%s_hci_msg_tx_wq", devname);
677 hdev->msg_tx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
678 WQ_MEM_RECLAIM, 1);
679 if (hdev->msg_tx_wq == NULL) {
680 r = -ENOMEM;
681 goto exit;
682 }
683
684 init_timer(&hdev->cmd_timer);
685 hdev->cmd_timer.data = (unsigned long)hdev;
686 hdev->cmd_timer.function = nfc_hci_cmd_timeout;
687
688 skb_queue_head_init(&hdev->rx_hcp_frags);
689
690 INIT_WORK(&hdev->msg_rx_work, nfc_hci_msg_rx_work);
691 snprintf(name, sizeof(name), "%s_hci_msg_rx_wq", devname);
692 hdev->msg_rx_wq = alloc_workqueue(name, WQ_NON_REENTRANT | WQ_UNBOUND |
693 WQ_MEM_RECLAIM, 1);
694 if (hdev->msg_rx_wq == NULL) {
695 r = -ENOMEM;
696 goto exit;
697 }
698
699 skb_queue_head_init(&hdev->msg_rx_queue);
700
701 r = nfc_register_device(hdev->ndev);
702
703exit:
704 if (r < 0) {
705 if (hdev->msg_tx_wq)
706 destroy_workqueue(hdev->msg_tx_wq);
707 if (hdev->msg_rx_wq)
708 destroy_workqueue(hdev->msg_rx_wq);
709 }
710
711 return r;
712}
713EXPORT_SYMBOL(nfc_hci_register_device);
714
715void nfc_hci_unregister_device(struct nfc_hci_dev *hdev)
716{
717 struct hci_msg *msg;
718
719 skb_queue_purge(&hdev->rx_hcp_frags);
720 skb_queue_purge(&hdev->msg_rx_queue);
721
722 while ((msg = list_first_entry(&hdev->msg_tx_queue, struct hci_msg,
723 msg_l)) != NULL) {
724 list_del(&msg->msg_l);
725 skb_queue_purge(&msg->msg_frags);
726 kfree(msg);
727 }
728
729 del_timer_sync(&hdev->cmd_timer);
730
731 nfc_unregister_device(hdev->ndev);
732
733 destroy_workqueue(hdev->msg_tx_wq);
734
735 destroy_workqueue(hdev->msg_rx_wq);
736}
737EXPORT_SYMBOL(nfc_hci_unregister_device);
738
739void nfc_hci_set_clientdata(struct nfc_hci_dev *hdev, void *clientdata)
740{
741 hdev->clientdata = clientdata;
742}
743EXPORT_SYMBOL(nfc_hci_set_clientdata);
744
745void *nfc_hci_get_clientdata(struct nfc_hci_dev *hdev)
746{
747 return hdev->clientdata;
748}
749EXPORT_SYMBOL(nfc_hci_get_clientdata);
750
751void nfc_hci_recv_frame(struct nfc_hci_dev *hdev, struct sk_buff *skb)
752{
753 struct hcp_packet *packet;
754 u8 type;
755 u8 instruction;
756 struct sk_buff *hcp_skb;
757 u8 pipe;
758 struct sk_buff *frag_skb;
759 int msg_len;
760
761 if (skb == NULL) {
762 /* TODO ELa: lower layer had permanent failure, need to
763 * propagate that up
764 */
765
766 skb_queue_purge(&hdev->rx_hcp_frags);
767
768 return;
769 }
770
771 packet = (struct hcp_packet *)skb->data;
772 if ((packet->header & ~NFC_HCI_FRAGMENT) == 0) {
773 skb_queue_tail(&hdev->rx_hcp_frags, skb);
774 return;
775 }
776
777 /* it's the last fragment. Does it need re-aggregation? */
778 if (skb_queue_len(&hdev->rx_hcp_frags)) {
779 pipe = packet->header & NFC_HCI_FRAGMENT;
780 skb_queue_tail(&hdev->rx_hcp_frags, skb);
781
782 msg_len = 0;
783 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
784 msg_len += (frag_skb->len -
785 NFC_HCI_HCP_PACKET_HEADER_LEN);
786 }
787
788 hcp_skb = nfc_alloc_recv_skb(NFC_HCI_HCP_PACKET_HEADER_LEN +
789 msg_len, GFP_KERNEL);
790 if (hcp_skb == NULL) {
791 /* TODO ELa: cannot deliver HCP message. How to
792 * propagate error up?
793 */
794 }
795
796 *skb_put(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN) = pipe;
797
798 skb_queue_walk(&hdev->rx_hcp_frags, frag_skb) {
799 msg_len = frag_skb->len - NFC_HCI_HCP_PACKET_HEADER_LEN;
800 memcpy(skb_put(hcp_skb, msg_len),
801 frag_skb->data + NFC_HCI_HCP_PACKET_HEADER_LEN,
802 msg_len);
803 }
804
805 skb_queue_purge(&hdev->rx_hcp_frags);
806 } else {
807 packet->header &= NFC_HCI_FRAGMENT;
808 hcp_skb = skb;
809 }
810
811 /* if this is a response, dispatch immediately to
812 * unblock waiting cmd context. Otherwise, enqueue to dispatch
813 * in separate context where handler can also execute command.
814 */
815 packet = (struct hcp_packet *)hcp_skb->data;
816 type = HCP_MSG_GET_TYPE(packet->message.header);
817 if (type == NFC_HCI_HCP_RESPONSE) {
818 pipe = packet->header;
819 instruction = HCP_MSG_GET_CMD(packet->message.header);
820 skb_pull(hcp_skb, NFC_HCI_HCP_PACKET_HEADER_LEN +
821 NFC_HCI_HCP_MESSAGE_HEADER_LEN);
822 nfc_hci_hcp_message_rx(hdev, pipe, type, instruction, hcp_skb);
823 } else {
824 skb_queue_tail(&hdev->msg_rx_queue, hcp_skb);
825 queue_work(hdev->msg_rx_wq, &hdev->msg_rx_work);
826 }
827}
828EXPORT_SYMBOL(nfc_hci_recv_frame);
829
830MODULE_LICENSE("GPL");
diff --git a/net/nfc/hci/hci.h b/net/nfc/hci/hci.h
new file mode 100644
index 000000000000..45f2fe4fd486
--- /dev/null
+++ b/net/nfc/hci/hci.h
@@ -0,0 +1,139 @@
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#ifndef __LOCAL_HCI_H
21#define __LOCAL_HCI_H
22
23struct gate_pipe_map {
24 u8 gate;
25 u8 pipe;
26};
27
28struct hcp_message {
29 u8 header; /* type -cmd,evt,rsp- + instruction */
30 u8 data[];
31} __packed;
32
33struct hcp_packet {
34 u8 header; /* cbit+pipe */
35 struct hcp_message message;
36} __packed;
37
38/*
39 * HCI command execution completion callback.
40 * result will be one of the HCI response codes.
41 * skb contains the response data and must be disposed.
42 */
43typedef void (*hci_cmd_cb_t) (struct nfc_hci_dev *hdev, u8 result,
44 struct sk_buff *skb, void *cb_data);
45
46struct hcp_exec_waiter {
47 wait_queue_head_t *wq;
48 bool exec_complete;
49 int exec_result;
50 struct sk_buff *result_skb;
51};
52
53struct hci_msg {
54 struct list_head msg_l;
55 struct sk_buff_head msg_frags;
56 bool wait_response;
57 hci_cmd_cb_t cb;
58 void *cb_context;
59 unsigned long completion_delay;
60};
61
62struct hci_create_pipe_params {
63 u8 src_gate;
64 u8 dest_host;
65 u8 dest_gate;
66} __packed;
67
68struct hci_create_pipe_resp {
69 u8 src_host;
70 u8 src_gate;
71 u8 dest_host;
72 u8 dest_gate;
73 u8 pipe;
74} __packed;
75
76#define NFC_HCI_FRAGMENT 0x7f
77
78#define HCP_HEADER(type, instr) ((((type) & 0x03) << 6) | ((instr) & 0x3f))
79#define HCP_MSG_GET_TYPE(header) ((header & 0xc0) >> 6)
80#define HCP_MSG_GET_CMD(header) (header & 0x3f)
81
82int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
83 u8 type, u8 instruction,
84 const u8 *payload, size_t payload_len,
85 hci_cmd_cb_t cb, void *cb_data,
86 unsigned long completion_delay);
87
88u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe);
89
90void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
91 u8 instruction, struct sk_buff *skb);
92
93/* HCP headers */
94#define NFC_HCI_HCP_PACKET_HEADER_LEN 1
95#define NFC_HCI_HCP_MESSAGE_HEADER_LEN 1
96#define NFC_HCI_HCP_HEADER_LEN 2
97
98/* HCP types */
99#define NFC_HCI_HCP_COMMAND 0x00
100#define NFC_HCI_HCP_EVENT 0x01
101#define NFC_HCI_HCP_RESPONSE 0x02
102
103/* Generic commands */
104#define NFC_HCI_ANY_SET_PARAMETER 0x01
105#define NFC_HCI_ANY_GET_PARAMETER 0x02
106#define NFC_HCI_ANY_OPEN_PIPE 0x03
107#define NFC_HCI_ANY_CLOSE_PIPE 0x04
108
109/* Reader RF commands */
110#define NFC_HCI_WR_XCHG_DATA 0x10
111
112/* Admin commands */
113#define NFC_HCI_ADM_CREATE_PIPE 0x10
114#define NFC_HCI_ADM_DELETE_PIPE 0x11
115#define NFC_HCI_ADM_NOTIFY_PIPE_CREATED 0x12
116#define NFC_HCI_ADM_NOTIFY_PIPE_DELETED 0x13
117#define NFC_HCI_ADM_CLEAR_ALL_PIPE 0x14
118#define NFC_HCI_ADM_NOTIFY_ALL_PIPE_CLEARED 0x15
119
120/* Generic responses */
121#define NFC_HCI_ANY_OK 0x00
122#define NFC_HCI_ANY_E_NOT_CONNECTED 0x01
123#define NFC_HCI_ANY_E_CMD_PAR_UNKNOWN 0x02
124#define NFC_HCI_ANY_E_NOK 0x03
125#define NFC_HCI_ANY_E_PIPES_FULL 0x04
126#define NFC_HCI_ANY_E_REG_PAR_UNKNOWN 0x05
127#define NFC_HCI_ANY_E_PIPE_NOT_OPENED 0x06
128#define NFC_HCI_ANY_E_CMD_NOT_SUPPORTED 0x07
129#define NFC_HCI_ANY_E_INHIBITED 0x08
130#define NFC_HCI_ANY_E_TIMEOUT 0x09
131#define NFC_HCI_ANY_E_REG_ACCESS_DENIED 0x0a
132#define NFC_HCI_ANY_E_PIPE_ACCESS_DENIED 0x0b
133
134/* Pipes */
135#define NFC_HCI_INVALID_PIPE 0x80
136#define NFC_HCI_LINK_MGMT_PIPE 0x00
137#define NFC_HCI_ADMIN_PIPE 0x01
138
139#endif /* __LOCAL_HCI_H */
diff --git a/net/nfc/hci/hcp.c b/net/nfc/hci/hcp.c
new file mode 100644
index 000000000000..7212cf2c5785
--- /dev/null
+++ b/net/nfc/hci/hcp.c
@@ -0,0 +1,156 @@
1/*
2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "hci: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/module.h>
25
26#include <net/nfc/hci.h>
27
28#include "hci.h"
29
30/*
31 * Payload is the HCP message data only. Instruction will be prepended.
32 * Guarantees that cb will be called upon completion or timeout delay
33 * counted from the moment the cmd is sent to the transport.
34 */
35int nfc_hci_hcp_message_tx(struct nfc_hci_dev *hdev, u8 pipe,
36 u8 type, u8 instruction,
37 const u8 *payload, size_t payload_len,
38 hci_cmd_cb_t cb, void *cb_data,
39 unsigned long completion_delay)
40{
41 struct nfc_dev *ndev = hdev->ndev;
42 struct hci_msg *cmd;
43 const u8 *ptr = payload;
44 int hci_len, err;
45 bool firstfrag = true;
46
47 cmd = kzalloc(sizeof(struct hci_msg), GFP_KERNEL);
48 if (cmd == NULL)
49 return -ENOMEM;
50
51 INIT_LIST_HEAD(&cmd->msg_l);
52 skb_queue_head_init(&cmd->msg_frags);
53 cmd->wait_response = (type == NFC_HCI_HCP_COMMAND) ? true : false;
54 cmd->cb = cb;
55 cmd->cb_context = cb_data;
56 cmd->completion_delay = completion_delay;
57
58 hci_len = payload_len + 1;
59 while (hci_len > 0) {
60 struct sk_buff *skb;
61 int skb_len, data_link_len;
62 struct hcp_packet *packet;
63
64 if (NFC_HCI_HCP_PACKET_HEADER_LEN + hci_len <=
65 hdev->max_data_link_payload)
66 data_link_len = hci_len;
67 else
68 data_link_len = hdev->max_data_link_payload -
69 NFC_HCI_HCP_PACKET_HEADER_LEN;
70
71 skb_len = ndev->tx_headroom + NFC_HCI_HCP_PACKET_HEADER_LEN +
72 data_link_len + ndev->tx_tailroom;
73 hci_len -= data_link_len;
74
75 skb = alloc_skb(skb_len, GFP_KERNEL);
76 if (skb == NULL) {
77 err = -ENOMEM;
78 goto out_skb_err;
79 }
80 skb_reserve(skb, ndev->tx_headroom);
81
82 skb_put(skb, NFC_HCI_HCP_PACKET_HEADER_LEN + data_link_len);
83
84 /* Only the last fragment will have the cb bit set to 1 */
85 packet = (struct hcp_packet *)skb->data;
86 packet->header = pipe;
87 if (firstfrag) {
88 firstfrag = false;
89 packet->message.header = HCP_HEADER(type, instruction);
90 if (ptr) {
91 memcpy(packet->message.data, ptr,
92 data_link_len - 1);
93 ptr += data_link_len - 1;
94 }
95 } else {
96 memcpy(&packet->message, ptr, data_link_len);
97 ptr += data_link_len;
98 }
99
100 /* This is the last fragment, set the cb bit */
101 if (hci_len == 0)
102 packet->header |= ~NFC_HCI_FRAGMENT;
103
104 skb_queue_tail(&cmd->msg_frags, skb);
105 }
106
107 mutex_lock(&hdev->msg_tx_mutex);
108 list_add_tail(&hdev->msg_tx_queue, &cmd->msg_l);
109 mutex_unlock(&hdev->msg_tx_mutex);
110
111 queue_work(hdev->msg_tx_wq, &hdev->msg_tx_work);
112
113 return 0;
114
115out_skb_err:
116 skb_queue_purge(&cmd->msg_frags);
117 kfree(cmd);
118
119 return err;
120}
121
122u8 nfc_hci_pipe2gate(struct nfc_hci_dev *hdev, u8 pipe)
123{
124 int gate;
125
126 for (gate = 0; gate < NFC_HCI_MAX_GATES; gate++)
127 if (hdev->gate2pipe[gate] == pipe)
128 return gate;
129
130 return 0xff;
131}
132
133/*
134 * Receive hcp message for pipe, with type and cmd.
135 * skb contains optional message data only.
136 */
137void nfc_hci_hcp_message_rx(struct nfc_hci_dev *hdev, u8 pipe, u8 type,
138 u8 instruction, struct sk_buff *skb)
139{
140 switch (type) {
141 case NFC_HCI_HCP_RESPONSE:
142 nfc_hci_resp_received(hdev, instruction, skb);
143 break;
144 case NFC_HCI_HCP_COMMAND:
145 nfc_hci_cmd_received(hdev, pipe, instruction, skb);
146 break;
147 case NFC_HCI_HCP_EVENT:
148 nfc_hci_event_received(hdev, pipe, instruction, skb);
149 break;
150 default:
151 pr_err("UNKNOWN MSG Type %d, instruction=%d\n",
152 type, instruction);
153 kfree_skb(skb);
154 break;
155 }
156}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-05 08:27:13 -0500