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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, see <http://www.gnu.org/licenses/>.
16 */
17
18#define pr_fmt(fmt) "hci: %s: " fmt, __func__
19
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/sched.h>
23#include <linux/module.h>
24
25#include <net/nfc/hci.h>
26
27#include "hci.h"
28
29static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
30 const u8 *param, size_t param_len,
31 data_exchange_cb_t cb, void *cb_context)
32{
33 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
34 cmd, param_len);
35
36 /* TODO: Define hci cmd execution delay. Should it be the same
37 * for all commands?
38 */
39 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
40 param, param_len, cb, cb_context, 3000);
41}
42
43/*
44 * HCI command execution completion callback.
45 * err will be a standard linux error (may be converted from HCI response)
46 * skb contains the response data and must be disposed, or may be NULL if
47 * an error occured
48 */
49static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
50{
51 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
52
53 pr_debug("HCI Cmd completed with result=%d\n", err);
54
55 hcp_ew->exec_result = err;
56 if (hcp_ew->exec_result == 0)
57 hcp_ew->result_skb = skb;
58 else
59 kfree_skb(skb);
60 hcp_ew->exec_complete = true;
61
62 wake_up(hcp_ew->wq);
63}
64
65static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
66 const u8 *param, size_t param_len,
67 struct sk_buff **skb)
68{
69 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
70 struct hcp_exec_waiter hcp_ew;
71 hcp_ew.wq = &ew_wq;
72 hcp_ew.exec_complete = false;
73 hcp_ew.result_skb = NULL;
74
75 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
76 cmd, param_len);
77
78 /* TODO: Define hci cmd execution delay. Should it be the same
79 * for all commands?
80 */
81 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
82 NFC_HCI_HCP_COMMAND, cmd,
83 param, param_len,
84 nfc_hci_execute_cb, &hcp_ew,
85 3000);
86 if (hcp_ew.exec_result < 0)
87 return hcp_ew.exec_result;
88
89 wait_event(ew_wq, hcp_ew.exec_complete == true);
90
91 if (hcp_ew.exec_result == 0) {
92 if (skb)
93 *skb = hcp_ew.result_skb;
94 else
95 kfree_skb(hcp_ew.result_skb);
96 }
97
98 return hcp_ew.exec_result;
99}
100
101int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
102 const u8 *param, size_t param_len)
103{
104 u8 pipe;
105
106 pr_debug("%d to gate %d\n", event, gate);
107
108 pipe = hdev->gate2pipe[gate];
109 if (pipe == NFC_HCI_INVALID_PIPE)
110 return -EADDRNOTAVAIL;
111
112 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
113 param, param_len, NULL, NULL, 0);
114}
115EXPORT_SYMBOL(nfc_hci_send_event);
116
117int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
118 const u8 *param, size_t param_len)
119{
120 u8 pipe;
121
122 pr_debug("\n");
123
124 pipe = hdev->gate2pipe[gate];
125 if (pipe == NFC_HCI_INVALID_PIPE)
126 return -EADDRNOTAVAIL;
127
128 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
129 response, param, param_len, NULL, NULL,
130 0);
131}
132EXPORT_SYMBOL(nfc_hci_send_response);
133
134/*
135 * Execute an hci command sent to gate.
136 * skb will contain response data if success. skb can be NULL if you are not
137 * interested by the response.
138 */
139int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
140 const u8 *param, size_t param_len, struct sk_buff **skb)
141{
142 u8 pipe;
143
144 pr_debug("\n");
145
146 pipe = hdev->gate2pipe[gate];
147 if (pipe == NFC_HCI_INVALID_PIPE)
148 return -EADDRNOTAVAIL;
149
150 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
151}
152EXPORT_SYMBOL(nfc_hci_send_cmd);
153
154int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
155 const u8 *param, size_t param_len,
156 data_exchange_cb_t cb, void *cb_context)
157{
158 u8 pipe;
159
160 pr_debug("\n");
161
162 pipe = hdev->gate2pipe[gate];
163 if (pipe == NFC_HCI_INVALID_PIPE)
164 return -EADDRNOTAVAIL;
165
166 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
167 cb, cb_context);
168}
169EXPORT_SYMBOL(nfc_hci_send_cmd_async);
170
171int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
172 const u8 *param, size_t param_len)
173{
174 int r;
175 u8 *tmp;
176
177 /* TODO ELa: reg idx must be inserted before param, but we don't want
178 * to ask the caller to do it to keep a simpler API.
179 * For now, just create a new temporary param buffer. This is far from
180 * optimal though, and the plan is to modify APIs to pass idx down to
181 * nfc_hci_hcp_message_tx where the frame is actually built, thereby
182 * eliminating the need for the temp allocation-copy here.
183 */
184
185 pr_debug("idx=%d to gate %d\n", idx, gate);
186
187 tmp = kmalloc(1 + param_len, GFP_KERNEL);
188 if (tmp == NULL)
189 return -ENOMEM;
190
191 *tmp = idx;
192 memcpy(tmp + 1, param, param_len);
193
194 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
195 tmp, param_len + 1, NULL);
196
197 kfree(tmp);
198
199 return r;
200}
201EXPORT_SYMBOL(nfc_hci_set_param);
202
203int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
204 struct sk_buff **skb)
205{
206 pr_debug("gate=%d regidx=%d\n", gate, idx);
207
208 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
209 &idx, 1, skb);
210}
211EXPORT_SYMBOL(nfc_hci_get_param);
212
213static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
214{
215 struct sk_buff *skb;
216 int r;
217
218 pr_debug("pipe=%d\n", pipe);
219
220 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
221 NULL, 0, &skb);
222 if (r == 0) {
223 /* dest host other than host controller will send
224 * number of pipes already open on this gate before
225 * execution. The number can be found in skb->data[0]
226 */
227 kfree_skb(skb);
228 }
229
230 return r;
231}
232
233static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
234{
235 pr_debug("\n");
236
237 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
238 NULL, 0, NULL);
239}
240
241static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
242 u8 dest_gate, int *result)
243{
244 struct sk_buff *skb;
245 struct hci_create_pipe_params params;
246 struct hci_create_pipe_resp *resp;
247 u8 pipe;
248
249 pr_debug("gate=%d\n", dest_gate);
250
251 params.src_gate = NFC_HCI_ADMIN_GATE;
252 params.dest_host = dest_host;
253 params.dest_gate = dest_gate;
254
255 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
256 NFC_HCI_ADM_CREATE_PIPE,
257 (u8 *) ¶ms, sizeof(params), &skb);
258 if (*result < 0)
259 return NFC_HCI_INVALID_PIPE;
260
261 resp = (struct hci_create_pipe_resp *)skb->data;
262 pipe = resp->pipe;
263 kfree_skb(skb);
264
265 pr_debug("pipe created=%d\n", pipe);
266
267 return pipe;
268}
269
270static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
271{
272 pr_debug("\n");
273
274 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
275 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
276}
277
278static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
279{
280 u8 param[2];
281 size_t param_len = 2;
282
283 /* TODO: Find out what the identity reference data is
284 * and fill param with it. HCI spec 6.1.3.5 */
285
286 pr_debug("\n");
287
288 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
289 param_len = 0;
290
291 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
292 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
293 NULL);
294}
295
296int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
297{
298 int r;
299 u8 pipe = hdev->gate2pipe[gate];
300
301 pr_debug("\n");
302
303 if (pipe == NFC_HCI_INVALID_PIPE)
304 return -EADDRNOTAVAIL;
305
306 r = nfc_hci_close_pipe(hdev, pipe);
307 if (r < 0)
308 return r;
309
310 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
311 r = nfc_hci_delete_pipe(hdev, pipe);
312 if (r < 0)
313 return r;
314 }
315
316 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
317
318 return 0;
319}
320EXPORT_SYMBOL(nfc_hci_disconnect_gate);
321
322int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
323{
324 int r;
325
326 pr_debug("\n");
327
328 r = nfc_hci_clear_all_pipes(hdev);
329 if (r < 0)
330 return r;
331
332 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
333
334 return 0;
335}
336EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
337
338int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
339 u8 pipe)
340{
341 bool pipe_created = false;
342 int r;
343
344 pr_debug("\n");
345
346 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
347 return -EADDRINUSE;
348
349 if (pipe != NFC_HCI_INVALID_PIPE)
350 goto open_pipe;
351
352 switch (dest_gate) {
353 case NFC_HCI_LINK_MGMT_GATE:
354 pipe = NFC_HCI_LINK_MGMT_PIPE;
355 break;
356 case NFC_HCI_ADMIN_GATE:
357 pipe = NFC_HCI_ADMIN_PIPE;
358 break;
359 default:
360 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
361 if (pipe == NFC_HCI_INVALID_PIPE)
362 return r;
363 pipe_created = true;
364 break;
365 }
366
367open_pipe:
368 r = nfc_hci_open_pipe(hdev, pipe);
369 if (r < 0) {
370 if (pipe_created)
371 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
372 /* TODO: Cannot clean by deleting pipe...
373 * -> inconsistent state */
374 }
375 return r;
376 }
377
378 hdev->gate2pipe[dest_gate] = pipe;
379
380 return 0;
381}
382EXPORT_SYMBOL(nfc_hci_connect_gate);