Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | e4c4789 | 2012-09-11 10:42:54 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | b5faa64 | 2012-09-11 10:41:41 +0200 | [diff] [blame] | 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) |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 52 | { |
Eric Lapuyade | b5faa64 | 2012-09-11 10:41:41 +0200 | [diff] [blame] | 53 | struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context; |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 54 | |
Eric Lapuyade | 6c1c5b9 | 2012-05-03 15:35:25 +0200 | [diff] [blame] | 55 | pr_debug("HCI Cmd completed with result=%d\n", err); |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 56 | |
Eric Lapuyade | 6c1c5b9 | 2012-05-03 15:35:25 +0200 | [diff] [blame] | 57 | hcp_ew->exec_result = err; |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | e4c4789 | 2012-09-11 10:42:54 +0200 | [diff] [blame] | 77 | pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe, |
| 78 | cmd, param_len); |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | e4c4789 | 2012-09-11 10:42:54 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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); |
Szymon Janc | 80e4232 | 2012-10-04 15:15:48 +0200 | [diff] [blame] | 260 | if (*result < 0) |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 261 | return NFC_HCI_INVALID_PIPE; |
Szymon Janc | 80e4232 | 2012-10-04 15:15:48 +0200 | [diff] [blame] | 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; |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | { |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 282 | u8 param[2]; |
Eric Lapuyade | bf71ab8 | 2012-12-18 14:15:49 +0100 | [diff] [blame] | 283 | size_t param_len = 2; |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | bf71ab8 | 2012-12-18 14:15:49 +0100 | [diff] [blame] | 290 | if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks)) |
| 291 | param_len = 0; |
| 292 | |
Szymon Janc | 0250ffc | 2012-10-04 15:15:49 +0200 | [diff] [blame] | 293 | return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE, |
Eric Lapuyade | bf71ab8 | 2012-12-18 14:15:49 +0100 | [diff] [blame] | 294 | NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len, |
| 295 | NULL); |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | a10d595 | 2012-06-05 14:42:11 +0200 | [diff] [blame] | 340 | int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate, |
| 341 | u8 pipe) |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 342 | { |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | a10d595 | 2012-06-05 14:42:11 +0200 | [diff] [blame] | 351 | if (pipe != NFC_HCI_INVALID_PIPE) |
Eric Lapuyade | 07887e9 | 2012-10-17 16:47:13 +0200 | [diff] [blame] | 352 | goto open_pipe; |
Eric Lapuyade | a10d595 | 2012-06-05 14:42:11 +0200 | [diff] [blame] | 353 | |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | 07887e9 | 2012-10-17 16:47:13 +0200 | [diff] [blame] | 369 | open_pipe: |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 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 | |
Eric Lapuyade | 8b8d2e0 | 2012-04-10 19:43:06 +0200 | [diff] [blame] | 380 | hdev->gate2pipe[dest_gate] = pipe; |
| 381 | |
| 382 | return 0; |
| 383 | } |
| 384 | EXPORT_SYMBOL(nfc_hci_connect_gate); |