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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2012 Intel Corporation. All rights reserved.
4 */
5
6#define pr_fmt(fmt) "hci: %s: " fmt, __func__
7
8#include <linux/init.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/module.h>
12
13#include <net/nfc/hci.h>
14
15#include "hci.h"
16
17#define MAX_FWI 4949
18
19static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
20 const u8 *param, size_t param_len,
21 data_exchange_cb_t cb, void *cb_context)
22{
23 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
24 cmd, param_len);
25
26 /* TODO: Define hci cmd execution delay. Should it be the same
27 * for all commands?
28 */
29 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
30 param, param_len, cb, cb_context, MAX_FWI);
31}
32
33/*
34 * HCI command execution completion callback.
35 * err will be a standard linux error (may be converted from HCI response)
36 * skb contains the response data and must be disposed, or may be NULL if
37 * an error occurred
38 */
39static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
40{
41 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
42
43 pr_debug("HCI Cmd completed with result=%d\n", err);
44
45 hcp_ew->exec_result = err;
46 if (hcp_ew->exec_result == 0)
47 hcp_ew->result_skb = skb;
48 else
49 kfree_skb(skb);
50 hcp_ew->exec_complete = true;
51
52 wake_up(hcp_ew->wq);
53}
54
55static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
56 const u8 *param, size_t param_len,
57 struct sk_buff **skb)
58{
59 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
60 struct hcp_exec_waiter hcp_ew;
61 hcp_ew.wq = &ew_wq;
62 hcp_ew.exec_complete = false;
63 hcp_ew.result_skb = NULL;
64
65 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
66 cmd, param_len);
67
68 /* TODO: Define hci cmd execution delay. Should it be the same
69 * for all commands?
70 */
71 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
72 NFC_HCI_HCP_COMMAND, cmd,
73 param, param_len,
74 nfc_hci_execute_cb, &hcp_ew,
75 MAX_FWI);
76 if (hcp_ew.exec_result < 0)
77 return hcp_ew.exec_result;
78
79 wait_event(ew_wq, hcp_ew.exec_complete == true);
80
81 if (hcp_ew.exec_result == 0) {
82 if (skb)
83 *skb = hcp_ew.result_skb;
84 else
85 kfree_skb(hcp_ew.result_skb);
86 }
87
88 return hcp_ew.exec_result;
89}
90
91int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
92 const u8 *param, size_t param_len)
93{
94 u8 pipe;
95
96 pr_debug("%d to gate %d\n", event, gate);
97
98 pipe = hdev->gate2pipe[gate];
99 if (pipe == NFC_HCI_INVALID_PIPE)
100 return -EADDRNOTAVAIL;
101
102 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
103 param, param_len, NULL, NULL, 0);
104}
105EXPORT_SYMBOL(nfc_hci_send_event);
106
107/*
108 * Execute an hci command sent to gate.
109 * skb will contain response data if success. skb can be NULL if you are not
110 * interested by the response.
111 */
112int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
113 const u8 *param, size_t param_len, struct sk_buff **skb)
114{
115 u8 pipe;
116
117 pipe = hdev->gate2pipe[gate];
118 if (pipe == NFC_HCI_INVALID_PIPE)
119 return -EADDRNOTAVAIL;
120
121 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
122}
123EXPORT_SYMBOL(nfc_hci_send_cmd);
124
125int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
126 const u8 *param, size_t param_len,
127 data_exchange_cb_t cb, void *cb_context)
128{
129 u8 pipe;
130
131 pipe = hdev->gate2pipe[gate];
132 if (pipe == NFC_HCI_INVALID_PIPE)
133 return -EADDRNOTAVAIL;
134
135 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
136 cb, cb_context);
137}
138EXPORT_SYMBOL(nfc_hci_send_cmd_async);
139
140int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
141 const u8 *param, size_t param_len)
142{
143 int r;
144 u8 *tmp;
145
146 /* TODO ELa: reg idx must be inserted before param, but we don't want
147 * to ask the caller to do it to keep a simpler API.
148 * For now, just create a new temporary param buffer. This is far from
149 * optimal though, and the plan is to modify APIs to pass idx down to
150 * nfc_hci_hcp_message_tx where the frame is actually built, thereby
151 * eliminating the need for the temp allocation-copy here.
152 */
153
154 pr_debug("idx=%d to gate %d\n", idx, gate);
155
156 tmp = kmalloc(1 + param_len, GFP_KERNEL);
157 if (tmp == NULL)
158 return -ENOMEM;
159
160 *tmp = idx;
161 memcpy(tmp + 1, param, param_len);
162
163 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
164 tmp, param_len + 1, NULL);
165
166 kfree(tmp);
167
168 return r;
169}
170EXPORT_SYMBOL(nfc_hci_set_param);
171
172int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
173 struct sk_buff **skb)
174{
175 pr_debug("gate=%d regidx=%d\n", gate, idx);
176
177 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
178 &idx, 1, skb);
179}
180EXPORT_SYMBOL(nfc_hci_get_param);
181
182static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
183{
184 struct sk_buff *skb;
185 int r;
186
187 pr_debug("pipe=%d\n", pipe);
188
189 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
190 NULL, 0, &skb);
191 if (r == 0) {
192 /* dest host other than host controller will send
193 * number of pipes already open on this gate before
194 * execution. The number can be found in skb->data[0]
195 */
196 kfree_skb(skb);
197 }
198
199 return r;
200}
201
202static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
203{
204 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
205 NULL, 0, NULL);
206}
207
208static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
209 u8 dest_gate, int *result)
210{
211 struct sk_buff *skb;
212 struct hci_create_pipe_params params;
213 struct hci_create_pipe_resp *resp;
214 u8 pipe;
215
216 pr_debug("gate=%d\n", dest_gate);
217
218 params.src_gate = NFC_HCI_ADMIN_GATE;
219 params.dest_host = dest_host;
220 params.dest_gate = dest_gate;
221
222 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
223 NFC_HCI_ADM_CREATE_PIPE,
224 (u8 *) ¶ms, sizeof(params), &skb);
225 if (*result < 0)
226 return NFC_HCI_INVALID_PIPE;
227
228 resp = (struct hci_create_pipe_resp *)skb->data;
229 pipe = resp->pipe;
230 kfree_skb(skb);
231
232 pr_debug("pipe created=%d\n", pipe);
233
234 return pipe;
235}
236
237static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
238{
239 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
240 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
241}
242
243static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
244{
245 u8 param[2];
246 size_t param_len = 2;
247
248 /* TODO: Find out what the identity reference data is
249 * and fill param with it. HCI spec 6.1.3.5 */
250
251 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
252 param_len = 0;
253
254 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
255 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
256 NULL);
257}
258
259int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
260{
261 int r;
262 u8 pipe = hdev->gate2pipe[gate];
263
264 if (pipe == NFC_HCI_INVALID_PIPE)
265 return -EADDRNOTAVAIL;
266
267 r = nfc_hci_close_pipe(hdev, pipe);
268 if (r < 0)
269 return r;
270
271 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
272 r = nfc_hci_delete_pipe(hdev, pipe);
273 if (r < 0)
274 return r;
275 }
276
277 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
278
279 return 0;
280}
281EXPORT_SYMBOL(nfc_hci_disconnect_gate);
282
283int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
284{
285 int r;
286
287 r = nfc_hci_clear_all_pipes(hdev);
288 if (r < 0)
289 return r;
290
291 nfc_hci_reset_pipes(hdev);
292
293 return 0;
294}
295EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
296
297int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
298 u8 pipe)
299{
300 bool pipe_created = false;
301 int r;
302
303 if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
304 return 0;
305
306 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
307 return -EADDRINUSE;
308
309 if (pipe != NFC_HCI_INVALID_PIPE)
310 goto open_pipe;
311
312 switch (dest_gate) {
313 case NFC_HCI_LINK_MGMT_GATE:
314 pipe = NFC_HCI_LINK_MGMT_PIPE;
315 break;
316 case NFC_HCI_ADMIN_GATE:
317 pipe = NFC_HCI_ADMIN_PIPE;
318 break;
319 default:
320 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
321 if (pipe == NFC_HCI_INVALID_PIPE)
322 return r;
323 pipe_created = true;
324 break;
325 }
326
327open_pipe:
328 r = nfc_hci_open_pipe(hdev, pipe);
329 if (r < 0) {
330 if (pipe_created)
331 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
332 /* TODO: Cannot clean by deleting pipe...
333 * -> inconsistent state */
334 }
335 return r;
336 }
337
338 hdev->pipes[pipe].gate = dest_gate;
339 hdev->pipes[pipe].dest_host = dest_host;
340 hdev->gate2pipe[dest_gate] = pipe;
341
342 return 0;
343}
344EXPORT_SYMBOL(nfc_hci_connect_gate);