2 * Copyright (C) 2012 Intel Corporation. All rights reserved.
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.
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.
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/>.
18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/module.h>
25 #include <net/nfc/hci.h>
29 static 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)
33 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
36 /* TODO: Define hci cmd execution delay. Should it be the same
39 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
40 param, param_len, cb, cb_context, 3000);
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
49 static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
51 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
53 pr_debug("HCI Cmd completed with result=%d\n", err);
55 hcp_ew->exec_result = err;
56 if (hcp_ew->exec_result == 0)
57 hcp_ew->result_skb = skb;
60 hcp_ew->exec_complete = true;
65 static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
66 const u8 *param, size_t param_len,
69 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
70 struct hcp_exec_waiter hcp_ew;
72 hcp_ew.exec_complete = false;
73 hcp_ew.result_skb = NULL;
75 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
78 /* TODO: Define hci cmd execution delay. Should it be the same
81 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
82 NFC_HCI_HCP_COMMAND, cmd,
84 nfc_hci_execute_cb, &hcp_ew,
86 if (hcp_ew.exec_result < 0)
87 return hcp_ew.exec_result;
89 wait_event(ew_wq, hcp_ew.exec_complete == true);
91 if (hcp_ew.exec_result == 0) {
93 *skb = hcp_ew.result_skb;
95 kfree_skb(hcp_ew.result_skb);
98 return hcp_ew.exec_result;
101 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
102 const u8 *param, size_t param_len)
106 pr_debug("%d to gate %d\n", event, gate);
108 pipe = hdev->gate2pipe[gate];
109 if (pipe == NFC_HCI_INVALID_PIPE)
110 return -EADDRNOTAVAIL;
112 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
113 param, param_len, NULL, NULL, 0);
115 EXPORT_SYMBOL(nfc_hci_send_event);
117 int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response,
118 const u8 *param, size_t param_len)
124 pipe = hdev->gate2pipe[gate];
125 if (pipe == NFC_HCI_INVALID_PIPE)
126 return -EADDRNOTAVAIL;
128 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE,
129 response, param, param_len, NULL, NULL,
132 EXPORT_SYMBOL(nfc_hci_send_response);
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.
139 int 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)
146 pipe = hdev->gate2pipe[gate];
147 if (pipe == NFC_HCI_INVALID_PIPE)
148 return -EADDRNOTAVAIL;
150 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
152 EXPORT_SYMBOL(nfc_hci_send_cmd);
154 int 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)
162 pipe = hdev->gate2pipe[gate];
163 if (pipe == NFC_HCI_INVALID_PIPE)
164 return -EADDRNOTAVAIL;
166 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
169 EXPORT_SYMBOL(nfc_hci_send_cmd_async);
171 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
172 const u8 *param, size_t param_len)
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.
185 pr_debug("idx=%d to gate %d\n", idx, gate);
187 tmp = kmalloc(1 + param_len, GFP_KERNEL);
192 memcpy(tmp + 1, param, param_len);
194 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
195 tmp, param_len + 1, NULL);
201 EXPORT_SYMBOL(nfc_hci_set_param);
203 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
204 struct sk_buff **skb)
206 pr_debug("gate=%d regidx=%d\n", gate, idx);
208 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
211 EXPORT_SYMBOL(nfc_hci_get_param);
213 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
218 pr_debug("pipe=%d\n", pipe);
220 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
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]
233 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
237 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
241 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
242 u8 dest_gate, int *result)
245 struct hci_create_pipe_params params;
246 struct hci_create_pipe_resp *resp;
249 pr_debug("gate=%d\n", dest_gate);
251 params.src_gate = NFC_HCI_ADMIN_GATE;
252 params.dest_host = dest_host;
253 params.dest_gate = dest_gate;
255 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
256 NFC_HCI_ADM_CREATE_PIPE,
257 (u8 *) ¶ms, sizeof(params), &skb);
259 return NFC_HCI_INVALID_PIPE;
261 resp = (struct hci_create_pipe_resp *)skb->data;
265 pr_debug("pipe created=%d\n", pipe);
270 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
274 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
275 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
278 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
281 size_t param_len = 2;
283 /* TODO: Find out what the identity reference data is
284 * and fill param with it. HCI spec 6.1.3.5 */
288 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
291 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
292 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
296 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
299 u8 pipe = hdev->gate2pipe[gate];
303 if (pipe == NFC_HCI_INVALID_PIPE)
304 return -EADDRNOTAVAIL;
306 r = nfc_hci_close_pipe(hdev, pipe);
310 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
311 r = nfc_hci_delete_pipe(hdev, pipe);
316 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
320 EXPORT_SYMBOL(nfc_hci_disconnect_gate);
322 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
328 r = nfc_hci_clear_all_pipes(hdev);
332 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe));
336 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
338 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
341 bool pipe_created = false;
346 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
349 if (pipe != NFC_HCI_INVALID_PIPE)
353 case NFC_HCI_LINK_MGMT_GATE:
354 pipe = NFC_HCI_LINK_MGMT_PIPE;
356 case NFC_HCI_ADMIN_GATE:
357 pipe = NFC_HCI_ADMIN_PIPE;
360 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
361 if (pipe == NFC_HCI_INVALID_PIPE)
368 r = nfc_hci_open_pipe(hdev, pipe);
371 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
372 /* TODO: Cannot clean by deleting pipe...
373 * -> inconsistent state */
378 hdev->gate2pipe[dest_gate] = pipe;
382 EXPORT_SYMBOL(nfc_hci_connect_gate);