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>
31 static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
32 const u8 *param, size_t param_len,
33 data_exchange_cb_t cb, void *cb_context)
35 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
38 /* TODO: Define hci cmd execution delay. Should it be the same
41 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
42 param, param_len, cb, cb_context, MAX_FWI);
46 * HCI command execution completion callback.
47 * err will be a standard linux error (may be converted from HCI response)
48 * skb contains the response data and must be disposed, or may be NULL if
51 static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
53 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
55 pr_debug("HCI Cmd completed with result=%d\n", err);
57 hcp_ew->exec_result = err;
58 if (hcp_ew->exec_result == 0)
59 hcp_ew->result_skb = skb;
62 hcp_ew->exec_complete = true;
67 static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
68 const u8 *param, size_t param_len,
71 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
72 struct hcp_exec_waiter hcp_ew;
74 hcp_ew.exec_complete = false;
75 hcp_ew.result_skb = NULL;
77 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
80 /* TODO: Define hci cmd execution delay. Should it be the same
83 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
84 NFC_HCI_HCP_COMMAND, cmd,
86 nfc_hci_execute_cb, &hcp_ew,
88 if (hcp_ew.exec_result < 0)
89 return hcp_ew.exec_result;
91 wait_event(ew_wq, hcp_ew.exec_complete == true);
93 if (hcp_ew.exec_result == 0) {
95 *skb = hcp_ew.result_skb;
97 kfree_skb(hcp_ew.result_skb);
100 return hcp_ew.exec_result;
103 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
104 const u8 *param, size_t param_len)
108 pr_debug("%d to gate %d\n", event, gate);
110 pipe = hdev->gate2pipe[gate];
111 if (pipe == NFC_HCI_INVALID_PIPE)
112 return -EADDRNOTAVAIL;
114 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
115 param, param_len, NULL, NULL, 0);
117 EXPORT_SYMBOL(nfc_hci_send_event);
120 * Execute an hci command sent to gate.
121 * skb will contain response data if success. skb can be NULL if you are not
122 * interested by the response.
124 int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
125 const u8 *param, size_t param_len, struct sk_buff **skb)
131 pipe = hdev->gate2pipe[gate];
132 if (pipe == NFC_HCI_INVALID_PIPE)
133 return -EADDRNOTAVAIL;
135 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
137 EXPORT_SYMBOL(nfc_hci_send_cmd);
139 int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
140 const u8 *param, size_t param_len,
141 data_exchange_cb_t cb, void *cb_context)
147 pipe = hdev->gate2pipe[gate];
148 if (pipe == NFC_HCI_INVALID_PIPE)
149 return -EADDRNOTAVAIL;
151 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
154 EXPORT_SYMBOL(nfc_hci_send_cmd_async);
156 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
157 const u8 *param, size_t param_len)
162 /* TODO ELa: reg idx must be inserted before param, but we don't want
163 * to ask the caller to do it to keep a simpler API.
164 * For now, just create a new temporary param buffer. This is far from
165 * optimal though, and the plan is to modify APIs to pass idx down to
166 * nfc_hci_hcp_message_tx where the frame is actually built, thereby
167 * eliminating the need for the temp allocation-copy here.
170 pr_debug("idx=%d to gate %d\n", idx, gate);
172 tmp = kmalloc(1 + param_len, GFP_KERNEL);
177 memcpy(tmp + 1, param, param_len);
179 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
180 tmp, param_len + 1, NULL);
186 EXPORT_SYMBOL(nfc_hci_set_param);
188 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
189 struct sk_buff **skb)
191 pr_debug("gate=%d regidx=%d\n", gate, idx);
193 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
196 EXPORT_SYMBOL(nfc_hci_get_param);
198 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
203 pr_debug("pipe=%d\n", pipe);
205 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
208 /* dest host other than host controller will send
209 * number of pipes already open on this gate before
210 * execution. The number can be found in skb->data[0]
218 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
222 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
226 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
227 u8 dest_gate, int *result)
230 struct hci_create_pipe_params params;
231 struct hci_create_pipe_resp *resp;
234 pr_debug("gate=%d\n", dest_gate);
236 params.src_gate = NFC_HCI_ADMIN_GATE;
237 params.dest_host = dest_host;
238 params.dest_gate = dest_gate;
240 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
241 NFC_HCI_ADM_CREATE_PIPE,
242 (u8 *) ¶ms, sizeof(params), &skb);
244 return NFC_HCI_INVALID_PIPE;
246 resp = (struct hci_create_pipe_resp *)skb->data;
250 pr_debug("pipe created=%d\n", pipe);
255 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
259 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
260 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
263 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
266 size_t param_len = 2;
268 /* TODO: Find out what the identity reference data is
269 * and fill param with it. HCI spec 6.1.3.5 */
273 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
276 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
277 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
281 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
284 u8 pipe = hdev->gate2pipe[gate];
288 if (pipe == NFC_HCI_INVALID_PIPE)
289 return -EADDRNOTAVAIL;
291 r = nfc_hci_close_pipe(hdev, pipe);
295 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
296 r = nfc_hci_delete_pipe(hdev, pipe);
301 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
305 EXPORT_SYMBOL(nfc_hci_disconnect_gate);
307 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
313 r = nfc_hci_clear_all_pipes(hdev);
317 nfc_hci_reset_pipes(hdev);
321 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
323 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
326 bool pipe_created = false;
331 if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
334 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
337 if (pipe != NFC_HCI_INVALID_PIPE)
341 case NFC_HCI_LINK_MGMT_GATE:
342 pipe = NFC_HCI_LINK_MGMT_PIPE;
344 case NFC_HCI_ADMIN_GATE:
345 pipe = NFC_HCI_ADMIN_PIPE;
348 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
349 if (pipe == NFC_HCI_INVALID_PIPE)
356 r = nfc_hci_open_pipe(hdev, pipe);
359 if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
360 /* TODO: Cannot clean by deleting pipe...
361 * -> inconsistent state */
366 hdev->pipes[pipe].gate = dest_gate;
367 hdev->pipes[pipe].dest_host = dest_host;
368 hdev->gate2pipe[dest_gate] = pipe;
372 EXPORT_SYMBOL(nfc_hci_connect_gate);