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