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_result_to_errno(u8 result) 32 { 33 switch (result) { 34 case NFC_HCI_ANY_OK: 35 return 0; 36 case NFC_HCI_ANY_E_TIMEOUT: 37 return -ETIMEDOUT; 38 default: 39 return -1; 40 } 41 } 42 43 static void nfc_hci_execute_cb(struct nfc_hci_dev *hdev, u8 result, 44 struct sk_buff *skb, void *cb_data) 45 { 46 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)cb_data; 47 48 pr_debug("HCI Cmd completed with HCI result=%d\n", result); 49 50 hcp_ew->exec_result = nfc_hci_result_to_errno(result); 51 if (hcp_ew->exec_result == 0) 52 hcp_ew->result_skb = skb; 53 else 54 kfree_skb(skb); 55 hcp_ew->exec_complete = true; 56 57 wake_up(hcp_ew->wq); 58 } 59 60 static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 61 const u8 *param, size_t param_len, 62 struct sk_buff **skb) 63 { 64 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq); 65 struct hcp_exec_waiter hcp_ew; 66 hcp_ew.wq = &ew_wq; 67 hcp_ew.exec_complete = false; 68 hcp_ew.result_skb = NULL; 69 70 pr_debug("through pipe=%d, cmd=%d, plen=%zd\n", pipe, cmd, param_len); 71 72 /* TODO: Define hci cmd execution delay. Should it be the same 73 * for all commands? 74 */ 75 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe, 76 NFC_HCI_HCP_COMMAND, cmd, 77 param, param_len, 78 nfc_hci_execute_cb, &hcp_ew, 79 3000); 80 if (hcp_ew.exec_result < 0) 81 return hcp_ew.exec_result; 82 83 wait_event(ew_wq, hcp_ew.exec_complete == true); 84 85 if (hcp_ew.exec_result == 0) { 86 if (skb) 87 *skb = hcp_ew.result_skb; 88 else 89 kfree_skb(hcp_ew.result_skb); 90 } 91 92 return hcp_ew.exec_result; 93 } 94 95 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event, 96 const u8 *param, size_t param_len) 97 { 98 u8 pipe; 99 100 pr_debug("%d to gate %d\n", event, gate); 101 102 pipe = hdev->gate2pipe[gate]; 103 if (pipe == NFC_HCI_INVALID_PIPE) 104 return -EADDRNOTAVAIL; 105 106 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event, 107 param, param_len, NULL, NULL, 0); 108 } 109 EXPORT_SYMBOL(nfc_hci_send_event); 110 111 int nfc_hci_send_response(struct nfc_hci_dev *hdev, u8 gate, u8 response, 112 const u8 *param, size_t param_len) 113 { 114 u8 pipe; 115 116 pr_debug("\n"); 117 118 pipe = hdev->gate2pipe[gate]; 119 if (pipe == NFC_HCI_INVALID_PIPE) 120 return -EADDRNOTAVAIL; 121 122 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_RESPONSE, 123 response, param, param_len, NULL, NULL, 124 0); 125 } 126 EXPORT_SYMBOL(nfc_hci_send_response); 127 128 /* 129 * Execute an hci command sent to gate. 130 * skb will contain response data if success. skb can be NULL if you are not 131 * interested by the response. 132 */ 133 int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, 134 const u8 *param, size_t param_len, struct sk_buff **skb) 135 { 136 u8 pipe; 137 138 pr_debug("\n"); 139 140 pipe = hdev->gate2pipe[gate]; 141 if (pipe == NFC_HCI_INVALID_PIPE) 142 return -EADDRNOTAVAIL; 143 144 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb); 145 } 146 EXPORT_SYMBOL(nfc_hci_send_cmd); 147 148 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 149 const u8 *param, size_t param_len) 150 { 151 int r; 152 u8 *tmp; 153 154 /* TODO ELa: reg idx must be inserted before param, but we don't want 155 * to ask the caller to do it to keep a simpler API. 156 * For now, just create a new temporary param buffer. This is far from 157 * optimal though, and the plan is to modify APIs to pass idx down to 158 * nfc_hci_hcp_message_tx where the frame is actually built, thereby 159 * eliminating the need for the temp allocation-copy here. 160 */ 161 162 pr_debug("idx=%d to gate %d\n", idx, gate); 163 164 tmp = kmalloc(1 + param_len, GFP_KERNEL); 165 if (tmp == NULL) 166 return -ENOMEM; 167 168 *tmp = idx; 169 memcpy(tmp + 1, param, param_len); 170 171 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER, 172 tmp, param_len + 1, NULL); 173 174 kfree(tmp); 175 176 return r; 177 } 178 EXPORT_SYMBOL(nfc_hci_set_param); 179 180 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 181 struct sk_buff **skb) 182 { 183 pr_debug("gate=%d regidx=%d\n", gate, idx); 184 185 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER, 186 &idx, 1, skb); 187 } 188 EXPORT_SYMBOL(nfc_hci_get_param); 189 190 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe) 191 { 192 struct sk_buff *skb; 193 int r; 194 195 pr_debug("pipe=%d\n", pipe); 196 197 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE, 198 NULL, 0, &skb); 199 if (r == 0) { 200 /* dest host other than host controller will send 201 * number of pipes already open on this gate before 202 * execution. The number can be found in skb->data[0] 203 */ 204 kfree_skb(skb); 205 } 206 207 return r; 208 } 209 210 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe) 211 { 212 pr_debug("\n"); 213 214 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE, 215 NULL, 0, NULL); 216 } 217 218 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host, 219 u8 dest_gate, int *result) 220 { 221 struct sk_buff *skb; 222 struct hci_create_pipe_params params; 223 struct hci_create_pipe_resp *resp; 224 u8 pipe; 225 226 pr_debug("gate=%d\n", dest_gate); 227 228 params.src_gate = NFC_HCI_ADMIN_GATE; 229 params.dest_host = dest_host; 230 params.dest_gate = dest_gate; 231 232 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 233 NFC_HCI_ADM_CREATE_PIPE, 234 (u8 *) ¶ms, sizeof(params), &skb); 235 if (*result == 0) { 236 resp = (struct hci_create_pipe_resp *)skb->data; 237 pipe = resp->pipe; 238 kfree_skb(skb); 239 240 pr_debug("pipe created=%d\n", pipe); 241 242 return pipe; 243 } else 244 return NFC_HCI_INVALID_PIPE; 245 } 246 247 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe) 248 { 249 pr_debug("\n"); 250 251 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 252 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL); 253 } 254 255 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev) 256 { 257 int r; 258 259 u8 param[2]; 260 261 /* TODO: Find out what the identity reference data is 262 * and fill param with it. HCI spec 6.1.3.5 */ 263 264 pr_debug("\n"); 265 266 r = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 267 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, 2, NULL); 268 269 return 0; 270 } 271 272 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate) 273 { 274 int r; 275 u8 pipe = hdev->gate2pipe[gate]; 276 277 pr_debug("\n"); 278 279 if (pipe == NFC_HCI_INVALID_PIPE) 280 return -EADDRNOTAVAIL; 281 282 r = nfc_hci_close_pipe(hdev, pipe); 283 if (r < 0) 284 return r; 285 286 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) { 287 r = nfc_hci_delete_pipe(hdev, pipe); 288 if (r < 0) 289 return r; 290 } 291 292 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE; 293 294 return 0; 295 } 296 EXPORT_SYMBOL(nfc_hci_disconnect_gate); 297 298 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev) 299 { 300 int r; 301 302 pr_debug("\n"); 303 304 r = nfc_hci_clear_all_pipes(hdev); 305 if (r < 0) 306 return r; 307 308 memset(hdev->gate2pipe, NFC_HCI_INVALID_PIPE, sizeof(hdev->gate2pipe)); 309 310 return 0; 311 } 312 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates); 313 314 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate) 315 { 316 u8 pipe = NFC_HCI_INVALID_PIPE; 317 bool pipe_created = false; 318 int r; 319 320 pr_debug("\n"); 321 322 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE) 323 return -EADDRINUSE; 324 325 switch (dest_gate) { 326 case NFC_HCI_LINK_MGMT_GATE: 327 pipe = NFC_HCI_LINK_MGMT_PIPE; 328 break; 329 case NFC_HCI_ADMIN_GATE: 330 pipe = NFC_HCI_ADMIN_PIPE; 331 break; 332 default: 333 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r); 334 if (pipe == NFC_HCI_INVALID_PIPE) 335 return r; 336 pipe_created = true; 337 break; 338 } 339 340 r = nfc_hci_open_pipe(hdev, pipe); 341 if (r < 0) { 342 if (pipe_created) 343 if (nfc_hci_delete_pipe(hdev, pipe) < 0) { 344 /* TODO: Cannot clean by deleting pipe... 345 * -> inconsistent state */ 346 } 347 return r; 348 } 349 350 hdev->gate2pipe[dest_gate] = pipe; 351 352 return 0; 353 } 354 EXPORT_SYMBOL(nfc_hci_connect_gate); 355