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, write to the 16 * Free Software Foundation, Inc., 17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 */ 19 20 #define pr_fmt(fmt) "hci: %s: " fmt, __func__ 21 22 #include <linux/init.h> 23 #include <linux/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/module.h> 26 27 #include <net/nfc/hci.h> 28 29 #include "hci.h" 30 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) 34 { 35 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe, 36 cmd, param_len); 37 38 /* TODO: Define hci cmd execution delay. Should it be the same 39 * for all commands? 40 */ 41 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd, 42 param, param_len, cb, cb_context, 3000); 43 } 44 45 /* 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 49 * an error occured 50 */ 51 static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err) 52 { 53 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context; 54 55 pr_debug("HCI Cmd completed with result=%d\n", err); 56 57 hcp_ew->exec_result = err; 58 if (hcp_ew->exec_result == 0) 59 hcp_ew->result_skb = skb; 60 else 61 kfree_skb(skb); 62 hcp_ew->exec_complete = true; 63 64 wake_up(hcp_ew->wq); 65 } 66 67 static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 68 const u8 *param, size_t param_len, 69 struct sk_buff **skb) 70 { 71 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq); 72 struct hcp_exec_waiter hcp_ew; 73 hcp_ew.wq = &ew_wq; 74 hcp_ew.exec_complete = false; 75 hcp_ew.result_skb = NULL; 76 77 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe, 78 cmd, param_len); 79 80 /* TODO: Define hci cmd execution delay. Should it be the same 81 * for all commands? 82 */ 83 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe, 84 NFC_HCI_HCP_COMMAND, cmd, 85 param, param_len, 86 nfc_hci_execute_cb, &hcp_ew, 87 3000); 88 if (hcp_ew.exec_result < 0) 89 return hcp_ew.exec_result; 90 91 wait_event(ew_wq, hcp_ew.exec_complete == true); 92 93 if (hcp_ew.exec_result == 0) { 94 if (skb) 95 *skb = hcp_ew.result_skb; 96 else 97 kfree_skb(hcp_ew.result_skb); 98 } 99 100 return hcp_ew.exec_result; 101 } 102 103 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event, 104 const u8 *param, size_t param_len) 105 { 106 u8 pipe; 107 108 pr_debug("%d to gate %d\n", event, gate); 109 110 pipe = hdev->gate2pipe[gate]; 111 if (pipe == NFC_HCI_INVALID_PIPE) 112 return -EADDRNOTAVAIL; 113 114 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event, 115 param, param_len, NULL, NULL, 0); 116 } 117 EXPORT_SYMBOL(nfc_hci_send_event); 118 119 int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response, 120 const u8 *param, size_t param_len) 121 { 122 u8 pipe; 123 124 pr_debug("\n"); 125 126 pipe = hdev->gate2pipe[gate]; 127 if (pipe == NFC_HCI_INVALID_PIPE) 128 return -EADDRNOTAVAIL; 129 130 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE, 131 response, param, param_len, NULL, NULL, 132 0); 133 } 134 EXPORT_SYMBOL(nfc_hci_send_response); 135 136 /* 137 * Execute an hci command sent to gate. 138 * skb will contain response data if success. skb can be NULL if you are not 139 * interested by the response. 140 */ 141 int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, 142 const u8 *param, size_t param_len, struct sk_buff **skb) 143 { 144 u8 pipe; 145 146 pr_debug("\n"); 147 148 pipe = hdev->gate2pipe[gate]; 149 if (pipe == NFC_HCI_INVALID_PIPE) 150 return -EADDRNOTAVAIL; 151 152 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb); 153 } 154 EXPORT_SYMBOL(nfc_hci_send_cmd); 155 156 int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, 157 const u8 *param, size_t param_len, 158 data_exchange_cb_t cb, void *cb_context) 159 { 160 u8 pipe; 161 162 pr_debug("\n"); 163 164 pipe = hdev->gate2pipe[gate]; 165 if (pipe == NFC_HCI_INVALID_PIPE) 166 return -EADDRNOTAVAIL; 167 168 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len, 169 cb, cb_context); 170 } 171 EXPORT_SYMBOL(nfc_hci_send_cmd_async); 172 173 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 174 const u8 *param, size_t param_len) 175 { 176 int r; 177 u8 *tmp; 178 179 /* TODO ELa: reg idx must be inserted before param, but we don't want 180 * to ask the caller to do it to keep a simpler API. 181 * For now, just create a new temporary param buffer. This is far from 182 * optimal though, and the plan is to modify APIs to pass idx down to 183 * nfc_hci_hcp_message_tx where the frame is actually built, thereby 184 * eliminating the need for the temp allocation-copy here. 185 */ 186 187 pr_debug("idx=%d to gate %d\n", idx, gate); 188 189 tmp = kmalloc(1 + param_len, GFP_KERNEL); 190 if (tmp == NULL) 191 return -ENOMEM; 192 193 *tmp = idx; 194 memcpy(tmp + 1, param, param_len); 195 196 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER, 197 tmp, param_len + 1, NULL); 198 199 kfree(tmp); 200 201 return r; 202 } 203 EXPORT_SYMBOL(nfc_hci_set_param); 204 205 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 206 struct sk_buff **skb) 207 { 208 pr_debug("gate=%d regidx=%d\n", gate, idx); 209 210 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER, 211 &idx, 1, skb); 212 } 213 EXPORT_SYMBOL(nfc_hci_get_param); 214 215 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe) 216 { 217 struct sk_buff *skb; 218 int r; 219 220 pr_debug("pipe=%d\n", pipe); 221 222 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE, 223 NULL, 0, &skb); 224 if (r == 0) { 225 /* dest host other than host controller will send 226 * number of pipes already open on this gate before 227 * execution. The number can be found in skb->data[0] 228 */ 229 kfree_skb(skb); 230 } 231 232 return r; 233 } 234 235 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe) 236 { 237 pr_debug("\n"); 238 239 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE, 240 NULL, 0, NULL); 241 } 242 243 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host, 244 u8 dest_gate, int *result) 245 { 246 struct sk_buff *skb; 247 struct hci_create_pipe_params params; 248 struct hci_create_pipe_resp *resp; 249 u8 pipe; 250 251 pr_debug("gate=%d\n", dest_gate); 252 253 params.src_gate = NFC_HCI_ADMIN_GATE; 254 params.dest_host = dest_host; 255 params.dest_gate = dest_gate; 256 257 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 258 NFC_HCI_ADM_CREATE_PIPE, 259 (u8 *) ¶ms, sizeof(params), &skb); 260 if (*result < 0) 261 return NFC_HCI_INVALID_PIPE; 262 263 resp = (struct hci_create_pipe_resp *)skb->data; 264 pipe = resp->pipe; 265 kfree_skb(skb); 266 267 pr_debug("pipe created=%d\n", pipe); 268 269 return pipe; 270 } 271 272 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe) 273 { 274 pr_debug("\n"); 275 276 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 277 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL); 278 } 279 280 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev) 281 { 282 u8 param[2]; 283 size_t param_len = 2; 284 285 /* TODO: Find out what the identity reference data is 286 * and fill param with it. HCI spec 6.1.3.5 */ 287 288 pr_debug("\n"); 289 290 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks)) 291 param_len = 0; 292 293 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 294 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len, 295 NULL); 296 } 297 298 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate) 299 { 300 int r; 301 u8 pipe = hdev->gate2pipe[gate]; 302 303 pr_debug("\n"); 304 305 if (pipe == NFC_HCI_INVALID_PIPE) 306 return -EADDRNOTAVAIL; 307 308 r = nfc_hci_close_pipe(hdev, pipe); 309 if (r < 0) 310 return r; 311 312 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) { 313 r = nfc_hci_delete_pipe(hdev, pipe); 314 if (r < 0) 315 return r; 316 } 317 318 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE; 319 320 return 0; 321 } 322 EXPORT_SYMBOL(nfc_hci_disconnect_gate); 323 324 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev) 325 { 326 int r; 327 328 pr_debug("\n"); 329 330 r = nfc_hci_clear_all_pipes(hdev); 331 if (r < 0) 332 return r; 333 334 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 335 336 return 0; 337 } 338 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates); 339 340 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, 341 u8 pipe) 342 { 343 bool pipe_created = false; 344 int r; 345 346 pr_debug("\n"); 347 348 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE) 349 return -EADDRINUSE; 350 351 if (pipe != NFC_HCI_INVALID_PIPE) 352 goto open_pipe; 353 354 switch (dest_gate) { 355 case NFC_HCI_LINK_MGMT_GATE: 356 pipe = NFC_HCI_LINK_MGMT_PIPE; 357 break; 358 case NFC_HCI_ADMIN_GATE: 359 pipe = NFC_HCI_ADMIN_PIPE; 360 break; 361 default: 362 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r); 363 if (pipe == NFC_HCI_INVALID_PIPE) 364 return r; 365 pipe_created = true; 366 break; 367 } 368 369 open_pipe: 370 r = nfc_hci_open_pipe(hdev, pipe); 371 if (r < 0) { 372 if (pipe_created) 373 if (nfc_hci_delete_pipe(hdev, pipe) < 0) { 374 /* TODO: Cannot clean by deleting pipe... 375 * -> inconsistent state */ 376 } 377 return r; 378 } 379 380 hdev->gate2pipe[dest_gate] = pipe; 381 382 return 0; 383 } 384 EXPORT_SYMBOL(nfc_hci_connect_gate); 385