1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2012 Intel Corporation. All rights reserved. 4 */ 5 6 #define pr_fmt(fmt) "hci: %s: " fmt, __func__ 7 8 #include <linux/init.h> 9 #include <linux/kernel.h> 10 #include <linux/sched.h> 11 #include <linux/module.h> 12 13 #include <net/nfc/hci.h> 14 15 #include "hci.h" 16 17 #define MAX_FWI 4949 18 19 static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 20 const u8 *param, size_t param_len, 21 data_exchange_cb_t cb, void *cb_context) 22 { 23 pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe, 24 cmd, param_len); 25 26 /* TODO: Define hci cmd execution delay. Should it be the same 27 * for all commands? 28 */ 29 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd, 30 param, param_len, cb, cb_context, MAX_FWI); 31 } 32 33 /* 34 * HCI command execution completion callback. 35 * err will be a standard linux error (may be converted from HCI response) 36 * skb contains the response data and must be disposed, or may be NULL if 37 * an error occured 38 */ 39 static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err) 40 { 41 struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context; 42 43 pr_debug("HCI Cmd completed with result=%d\n", err); 44 45 hcp_ew->exec_result = err; 46 if (hcp_ew->exec_result == 0) 47 hcp_ew->result_skb = skb; 48 else 49 kfree_skb(skb); 50 hcp_ew->exec_complete = true; 51 52 wake_up(hcp_ew->wq); 53 } 54 55 static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd, 56 const u8 *param, size_t param_len, 57 struct sk_buff **skb) 58 { 59 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq); 60 struct hcp_exec_waiter hcp_ew; 61 hcp_ew.wq = &ew_wq; 62 hcp_ew.exec_complete = false; 63 hcp_ew.result_skb = NULL; 64 65 pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe, 66 cmd, param_len); 67 68 /* TODO: Define hci cmd execution delay. Should it be the same 69 * for all commands? 70 */ 71 hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe, 72 NFC_HCI_HCP_COMMAND, cmd, 73 param, param_len, 74 nfc_hci_execute_cb, &hcp_ew, 75 MAX_FWI); 76 if (hcp_ew.exec_result < 0) 77 return hcp_ew.exec_result; 78 79 wait_event(ew_wq, hcp_ew.exec_complete == true); 80 81 if (hcp_ew.exec_result == 0) { 82 if (skb) 83 *skb = hcp_ew.result_skb; 84 else 85 kfree_skb(hcp_ew.result_skb); 86 } 87 88 return hcp_ew.exec_result; 89 } 90 91 int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event, 92 const u8 *param, size_t param_len) 93 { 94 u8 pipe; 95 96 pr_debug("%d to gate %d\n", event, gate); 97 98 pipe = hdev->gate2pipe[gate]; 99 if (pipe == NFC_HCI_INVALID_PIPE) 100 return -EADDRNOTAVAIL; 101 102 return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event, 103 param, param_len, NULL, NULL, 0); 104 } 105 EXPORT_SYMBOL(nfc_hci_send_event); 106 107 /* 108 * Execute an hci command sent to gate. 109 * skb will contain response data if success. skb can be NULL if you are not 110 * interested by the response. 111 */ 112 int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, 113 const u8 *param, size_t param_len, struct sk_buff **skb) 114 { 115 u8 pipe; 116 117 pr_debug("\n"); 118 119 pipe = hdev->gate2pipe[gate]; 120 if (pipe == NFC_HCI_INVALID_PIPE) 121 return -EADDRNOTAVAIL; 122 123 return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb); 124 } 125 EXPORT_SYMBOL(nfc_hci_send_cmd); 126 127 int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd, 128 const u8 *param, size_t param_len, 129 data_exchange_cb_t cb, void *cb_context) 130 { 131 u8 pipe; 132 133 pr_debug("\n"); 134 135 pipe = hdev->gate2pipe[gate]; 136 if (pipe == NFC_HCI_INVALID_PIPE) 137 return -EADDRNOTAVAIL; 138 139 return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len, 140 cb, cb_context); 141 } 142 EXPORT_SYMBOL(nfc_hci_send_cmd_async); 143 144 int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 145 const u8 *param, size_t param_len) 146 { 147 int r; 148 u8 *tmp; 149 150 /* TODO ELa: reg idx must be inserted before param, but we don't want 151 * to ask the caller to do it to keep a simpler API. 152 * For now, just create a new temporary param buffer. This is far from 153 * optimal though, and the plan is to modify APIs to pass idx down to 154 * nfc_hci_hcp_message_tx where the frame is actually built, thereby 155 * eliminating the need for the temp allocation-copy here. 156 */ 157 158 pr_debug("idx=%d to gate %d\n", idx, gate); 159 160 tmp = kmalloc(1 + param_len, GFP_KERNEL); 161 if (tmp == NULL) 162 return -ENOMEM; 163 164 *tmp = idx; 165 memcpy(tmp + 1, param, param_len); 166 167 r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER, 168 tmp, param_len + 1, NULL); 169 170 kfree(tmp); 171 172 return r; 173 } 174 EXPORT_SYMBOL(nfc_hci_set_param); 175 176 int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx, 177 struct sk_buff **skb) 178 { 179 pr_debug("gate=%d regidx=%d\n", gate, idx); 180 181 return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER, 182 &idx, 1, skb); 183 } 184 EXPORT_SYMBOL(nfc_hci_get_param); 185 186 static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe) 187 { 188 struct sk_buff *skb; 189 int r; 190 191 pr_debug("pipe=%d\n", pipe); 192 193 r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE, 194 NULL, 0, &skb); 195 if (r == 0) { 196 /* dest host other than host controller will send 197 * number of pipes already open on this gate before 198 * execution. The number can be found in skb->data[0] 199 */ 200 kfree_skb(skb); 201 } 202 203 return r; 204 } 205 206 static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe) 207 { 208 pr_debug("\n"); 209 210 return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE, 211 NULL, 0, NULL); 212 } 213 214 static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host, 215 u8 dest_gate, int *result) 216 { 217 struct sk_buff *skb; 218 struct hci_create_pipe_params params; 219 struct hci_create_pipe_resp *resp; 220 u8 pipe; 221 222 pr_debug("gate=%d\n", dest_gate); 223 224 params.src_gate = NFC_HCI_ADMIN_GATE; 225 params.dest_host = dest_host; 226 params.dest_gate = dest_gate; 227 228 *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 229 NFC_HCI_ADM_CREATE_PIPE, 230 (u8 *) ¶ms, sizeof(params), &skb); 231 if (*result < 0) 232 return NFC_HCI_INVALID_PIPE; 233 234 resp = (struct hci_create_pipe_resp *)skb->data; 235 pipe = resp->pipe; 236 kfree_skb(skb); 237 238 pr_debug("pipe created=%d\n", pipe); 239 240 return pipe; 241 } 242 243 static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe) 244 { 245 pr_debug("\n"); 246 247 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 248 NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL); 249 } 250 251 static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev) 252 { 253 u8 param[2]; 254 size_t param_len = 2; 255 256 /* TODO: Find out what the identity reference data is 257 * and fill param with it. HCI spec 6.1.3.5 */ 258 259 pr_debug("\n"); 260 261 if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks)) 262 param_len = 0; 263 264 return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, 265 NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len, 266 NULL); 267 } 268 269 int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate) 270 { 271 int r; 272 u8 pipe = hdev->gate2pipe[gate]; 273 274 pr_debug("\n"); 275 276 if (pipe == NFC_HCI_INVALID_PIPE) 277 return -EADDRNOTAVAIL; 278 279 r = nfc_hci_close_pipe(hdev, pipe); 280 if (r < 0) 281 return r; 282 283 if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) { 284 r = nfc_hci_delete_pipe(hdev, pipe); 285 if (r < 0) 286 return r; 287 } 288 289 hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE; 290 291 return 0; 292 } 293 EXPORT_SYMBOL(nfc_hci_disconnect_gate); 294 295 int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev) 296 { 297 int r; 298 299 pr_debug("\n"); 300 301 r = nfc_hci_clear_all_pipes(hdev); 302 if (r < 0) 303 return r; 304 305 nfc_hci_reset_pipes(hdev); 306 307 return 0; 308 } 309 EXPORT_SYMBOL(nfc_hci_disconnect_all_gates); 310 311 int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, 312 u8 pipe) 313 { 314 bool pipe_created = false; 315 int r; 316 317 pr_debug("\n"); 318 319 if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE) 320 return 0; 321 322 if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE) 323 return -EADDRINUSE; 324 325 if (pipe != NFC_HCI_INVALID_PIPE) 326 goto open_pipe; 327 328 switch (dest_gate) { 329 case NFC_HCI_LINK_MGMT_GATE: 330 pipe = NFC_HCI_LINK_MGMT_PIPE; 331 break; 332 case NFC_HCI_ADMIN_GATE: 333 pipe = NFC_HCI_ADMIN_PIPE; 334 break; 335 default: 336 pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r); 337 if (pipe == NFC_HCI_INVALID_PIPE) 338 return r; 339 pipe_created = true; 340 break; 341 } 342 343 open_pipe: 344 r = nfc_hci_open_pipe(hdev, pipe); 345 if (r < 0) { 346 if (pipe_created) 347 if (nfc_hci_delete_pipe(hdev, pipe) < 0) { 348 /* TODO: Cannot clean by deleting pipe... 349 * -> inconsistent state */ 350 } 351 return r; 352 } 353 354 hdev->pipes[pipe].gate = dest_gate; 355 hdev->pipes[pipe].dest_host = dest_host; 356 hdev->gate2pipe[dest_gate] = pipe; 357 358 return 0; 359 } 360 EXPORT_SYMBOL(nfc_hci_connect_gate); 361