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, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #define pr_fmt(fmt) "hci: %s: " fmt, __func__ 19 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/sched.h> 23 #include <linux/module.h> 24 25 #include <net/nfc/hci.h> 26 27 #include "hci.h" 28 29 #define MAX_FWI 4949 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, MAX_FWI); 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 MAX_FWI); 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 /* 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. 123 */ 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) 126 { 127 u8 pipe; 128 129 pr_debug("\n"); 130 131 pipe = hdev->gate2pipe[gate]; 132 if (pipe == NFC_HCI_INVALID_PIPE) 133 return -EADDRNOTAVAIL; 134 135 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb); 136 } 137 EXPORT_SYMBOL(nfc_hci_send_cmd); 138 139 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) 142 { 143 u8 pipe; 144 145 pr_debug("\n"); 146 147 pipe = hdev->gate2pipe[gate]; 148 if (pipe == NFC_HCI_INVALID_PIPE) 149 return -EADDRNOTAVAIL; 150 151 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len, 152 cb, cb_context); 153 } 154 EXPORT_SYMBOL(nfc_hci_send_cmd_async); 155 156 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 157 const u8 *param, size_t param_len) 158 { 159 int r; 160 u8 *tmp; 161 162 /* 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. 168 */ 169 170 pr_debug("idx=%d to gate %d\n", idx, gate); 171 172 tmp = kmalloc(1 + param_len, GFP_KERNEL); 173 if (tmp == NULL) 174 return -ENOMEM; 175 176 *tmp = idx; 177 memcpy(tmp + 1, param, param_len); 178 179 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER, 180 tmp, param_len + 1, NULL); 181 182 kfree(tmp); 183 184 return r; 185 } 186 EXPORT_SYMBOL(nfc_hci_set_param); 187 188 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 189 struct sk_buff **skb) 190 { 191 pr_debug("gate=%d regidx=%d\n", gate, idx); 192 193 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER, 194 &idx, 1, skb); 195 } 196 EXPORT_SYMBOL(nfc_hci_get_param); 197 198 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe) 199 { 200 struct sk_buff *skb; 201 int r; 202 203 pr_debug("pipe=%d\n", pipe); 204 205 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE, 206 NULL, 0, &skb); 207 if (r == 0) { 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] 211 */ 212 kfree_skb(skb); 213 } 214 215 return r; 216 } 217 218 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe) 219 { 220 pr_debug("\n"); 221 222 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE, 223 NULL, 0, NULL); 224 } 225 226 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host, 227 u8 dest_gate, int *result) 228 { 229 struct sk_buff *skb; 230 struct hci_create_pipe_params params; 231 struct hci_create_pipe_resp *resp; 232 u8 pipe; 233 234 pr_debug("gate=%d\n", dest_gate); 235 236 params.src_gate = NFC_HCI_ADMIN_GATE; 237 params.dest_host = dest_host; 238 params.dest_gate = dest_gate; 239 240 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 241 NFC_HCI_ADM_CREATE_PIPE, 242 (u8 *) ¶ms, sizeof(params), &skb); 243 if (*result < 0) 244 return NFC_HCI_INVALID_PIPE; 245 246 resp = (struct hci_create_pipe_resp *)skb->data; 247 pipe = resp->pipe; 248 kfree_skb(skb); 249 250 pr_debug("pipe created=%d\n", pipe); 251 252 return pipe; 253 } 254 255 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe) 256 { 257 pr_debug("\n"); 258 259 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 260 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL); 261 } 262 263 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev) 264 { 265 u8 param[2]; 266 size_t param_len = 2; 267 268 /* TODO: Find out what the identity reference data is 269 * and fill param with it. HCI spec 6.1.3.5 */ 270 271 pr_debug("\n"); 272 273 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks)) 274 param_len = 0; 275 276 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 277 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len, 278 NULL); 279 } 280 281 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate) 282 { 283 int r; 284 u8 pipe = hdev->gate2pipe[gate]; 285 286 pr_debug("\n"); 287 288 if (pipe == NFC_HCI_INVALID_PIPE) 289 return -EADDRNOTAVAIL; 290 291 r = nfc_hci_close_pipe(hdev, pipe); 292 if (r < 0) 293 return r; 294 295 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) { 296 r = nfc_hci_delete_pipe(hdev, pipe); 297 if (r < 0) 298 return r; 299 } 300 301 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE; 302 303 return 0; 304 } 305 EXPORT_SYMBOL(nfc_hci_disconnect_gate); 306 307 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev) 308 { 309 int r; 310 311 pr_debug("\n"); 312 313 r = nfc_hci_clear_all_pipes(hdev); 314 if (r < 0) 315 return r; 316 317 nfc_hci_reset_pipes(hdev); 318 319 return 0; 320 } 321 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates); 322 323 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, 324 u8 pipe) 325 { 326 bool pipe_created = false; 327 int r; 328 329 pr_debug("\n"); 330 331 if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE) 332 return 0; 333 334 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE) 335 return -EADDRINUSE; 336 337 if (pipe != NFC_HCI_INVALID_PIPE) 338 goto open_pipe; 339 340 switch (dest_gate) { 341 case NFC_HCI_LINK_MGMT_GATE: 342 pipe = NFC_HCI_LINK_MGMT_PIPE; 343 break; 344 case NFC_HCI_ADMIN_GATE: 345 pipe = NFC_HCI_ADMIN_PIPE; 346 break; 347 default: 348 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r); 349 if (pipe == NFC_HCI_INVALID_PIPE) 350 return r; 351 pipe_created = true; 352 break; 353 } 354 355 open_pipe: 356 r = nfc_hci_open_pipe(hdev, pipe); 357 if (r < 0) { 358 if (pipe_created) 359 if (nfc_hci_delete_pipe(hdev, pipe) < 0) { 360 /* TODO: Cannot clean by deleting pipe... 361 * -> inconsistent state */ 362 } 363 return r; 364 } 365 366 hdev->pipes[pipe].gate = dest_gate; 367 hdev->pipes[pipe].dest_host = dest_host; 368 hdev->gate2pipe[dest_gate] = pipe; 369 370 return 0; 371 } 372 EXPORT_SYMBOL(nfc_hci_connect_gate); 373