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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 occured
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 pr_debug("\n");
118
119 pipe = hdev->gate2pipe[gate];
120 if (pipe == NFC_HCI_INVALID_PIPE)
121 return -EADDRNOTAVAIL;
122
123 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
124}
125EXPORT_SYMBOL(nfc_hci_send_cmd);
126
127int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
128 const u8 *param, size_t param_len,
129 data_exchange_cb_t cb, void *cb_context)
130{
131 u8 pipe;
132
133 pr_debug("\n");
134
135 pipe = hdev->gate2pipe[gate];
136 if (pipe == NFC_HCI_INVALID_PIPE)
137 return -EADDRNOTAVAIL;
138
139 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
140 cb, cb_context);
141}
142EXPORT_SYMBOL(nfc_hci_send_cmd_async);
143
144int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
145 const u8 *param, size_t param_len)
146{
147 int r;
148 u8 *tmp;
149
150 /* TODO ELa: reg idx must be inserted before param, but we don't want
151 * to ask the caller to do it to keep a simpler API.
152 * For now, just create a new temporary param buffer. This is far from
153 * optimal though, and the plan is to modify APIs to pass idx down to
154 * nfc_hci_hcp_message_tx where the frame is actually built, thereby
155 * eliminating the need for the temp allocation-copy here.
156 */
157
158 pr_debug("idx=%d to gate %d\n", idx, gate);
159
160 tmp = kmalloc(1 + param_len, GFP_KERNEL);
161 if (tmp == NULL)
162 return -ENOMEM;
163
164 *tmp = idx;
165 memcpy(tmp + 1, param, param_len);
166
167 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
168 tmp, param_len + 1, NULL);
169
170 kfree(tmp);
171
172 return r;
173}
174EXPORT_SYMBOL(nfc_hci_set_param);
175
176int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
177 struct sk_buff **skb)
178{
179 pr_debug("gate=%d regidx=%d\n", gate, idx);
180
181 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
182 &idx, 1, skb);
183}
184EXPORT_SYMBOL(nfc_hci_get_param);
185
186static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
187{
188 struct sk_buff *skb;
189 int r;
190
191 pr_debug("pipe=%d\n", pipe);
192
193 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
194 NULL, 0, &skb);
195 if (r == 0) {
196 /* dest host other than host controller will send
197 * number of pipes already open on this gate before
198 * execution. The number can be found in skb->data[0]
199 */
200 kfree_skb(skb);
201 }
202
203 return r;
204}
205
206static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
207{
208 pr_debug("\n");
209
210 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
211 NULL, 0, NULL);
212}
213
214static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
215 u8 dest_gate, int *result)
216{
217 struct sk_buff *skb;
218 struct hci_create_pipe_params params;
219 struct hci_create_pipe_resp *resp;
220 u8 pipe;
221
222 pr_debug("gate=%d\n", dest_gate);
223
224 params.src_gate = NFC_HCI_ADMIN_GATE;
225 params.dest_host = dest_host;
226 params.dest_gate = dest_gate;
227
228 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
229 NFC_HCI_ADM_CREATE_PIPE,
230 (u8 *) ¶ms, sizeof(params), &skb);
231 if (*result < 0)
232 return NFC_HCI_INVALID_PIPE;
233
234 resp = (struct hci_create_pipe_resp *)skb->data;
235 pipe = resp->pipe;
236 kfree_skb(skb);
237
238 pr_debug("pipe created=%d\n", pipe);
239
240 return pipe;
241}
242
243static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
244{
245 pr_debug("\n");
246
247 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
248 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
249}
250
251static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
252{
253 u8 param[2];
254 size_t param_len = 2;
255
256 /* TODO: Find out what the identity reference data is
257 * and fill param with it. HCI spec 6.1.3.5 */
258
259 pr_debug("\n");
260
261 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
262 param_len = 0;
263
264 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
265 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
266 NULL);
267}
268
269int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
270{
271 int r;
272 u8 pipe = hdev->gate2pipe[gate];
273
274 pr_debug("\n");
275
276 if (pipe == NFC_HCI_INVALID_PIPE)
277 return -EADDRNOTAVAIL;
278
279 r = nfc_hci_close_pipe(hdev, pipe);
280 if (r < 0)
281 return r;
282
283 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
284 r = nfc_hci_delete_pipe(hdev, pipe);
285 if (r < 0)
286 return r;
287 }
288
289 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
290
291 return 0;
292}
293EXPORT_SYMBOL(nfc_hci_disconnect_gate);
294
295int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
296{
297 int r;
298
299 pr_debug("\n");
300
301 r = nfc_hci_clear_all_pipes(hdev);
302 if (r < 0)
303 return r;
304
305 nfc_hci_reset_pipes(hdev);
306
307 return 0;
308}
309EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
310
311int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
312 u8 pipe)
313{
314 bool pipe_created = false;
315 int r;
316
317 pr_debug("\n");
318
319 if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
320 return 0;
321
322 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
323 return -EADDRINUSE;
324
325 if (pipe != NFC_HCI_INVALID_PIPE)
326 goto open_pipe;
327
328 switch (dest_gate) {
329 case NFC_HCI_LINK_MGMT_GATE:
330 pipe = NFC_HCI_LINK_MGMT_PIPE;
331 break;
332 case NFC_HCI_ADMIN_GATE:
333 pipe = NFC_HCI_ADMIN_PIPE;
334 break;
335 default:
336 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
337 if (pipe == NFC_HCI_INVALID_PIPE)
338 return r;
339 pipe_created = true;
340 break;
341 }
342
343open_pipe:
344 r = nfc_hci_open_pipe(hdev, pipe);
345 if (r < 0) {
346 if (pipe_created)
347 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
348 /* TODO: Cannot clean by deleting pipe...
349 * -> inconsistent state */
350 }
351 return r;
352 }
353
354 hdev->pipes[pipe].gate = dest_gate;
355 hdev->pipes[pipe].dest_host = dest_host;
356 hdev->gate2pipe[dest_gate] = pipe;
357
358 return 0;
359}
360EXPORT_SYMBOL(nfc_hci_connect_gate);