Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 1 | /* |
| 2 | * NFC Digital Protocol stack |
| 3 | * Copyright (c) 2013, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | |
| 18 | #include "digital.h" |
| 19 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 20 | #define DIGITAL_PROTO_NFCA_RF_TECH \ |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 21 | (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | NFC_PROTO_NFC_DEP_MASK) |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 22 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 23 | #define DIGITAL_PROTO_NFCF_RF_TECH \ |
| 24 | (NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK) |
Thierry Escande | 8c0695e4 | 2013-09-19 17:55:28 +0200 | [diff] [blame] | 25 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 26 | struct digital_cmd { |
| 27 | struct list_head queue; |
| 28 | |
| 29 | u8 type; |
| 30 | u8 pending; |
| 31 | |
| 32 | u16 timeout; |
| 33 | struct sk_buff *req; |
| 34 | struct sk_buff *resp; |
| 35 | |
| 36 | nfc_digital_cmd_complete_t cmd_cb; |
| 37 | void *cb_context; |
| 38 | }; |
| 39 | |
| 40 | struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev, |
| 41 | unsigned int len) |
| 42 | { |
| 43 | struct sk_buff *skb; |
| 44 | |
| 45 | skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom, |
| 46 | GFP_KERNEL); |
| 47 | if (skb) |
| 48 | skb_reserve(skb, ddev->tx_headroom); |
| 49 | |
| 50 | return skb; |
| 51 | } |
| 52 | |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 53 | void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init, |
| 54 | u8 bitwise_inv, u8 msb_first) |
| 55 | { |
| 56 | u16 crc; |
| 57 | |
| 58 | crc = crc_func(init, skb->data, skb->len); |
| 59 | |
| 60 | if (bitwise_inv) |
| 61 | crc = ~crc; |
| 62 | |
| 63 | if (msb_first) |
| 64 | crc = __fswab16(crc); |
| 65 | |
| 66 | *skb_put(skb, 1) = crc & 0xFF; |
| 67 | *skb_put(skb, 1) = (crc >> 8) & 0xFF; |
| 68 | } |
| 69 | |
| 70 | int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func, |
| 71 | u16 crc_init, u8 bitwise_inv, u8 msb_first) |
| 72 | { |
| 73 | int rc; |
| 74 | u16 crc; |
| 75 | |
| 76 | if (skb->len <= 2) |
| 77 | return -EIO; |
| 78 | |
| 79 | crc = crc_func(crc_init, skb->data, skb->len - 2); |
| 80 | |
| 81 | if (bitwise_inv) |
| 82 | crc = ~crc; |
| 83 | |
| 84 | if (msb_first) |
| 85 | crc = __swab16(crc); |
| 86 | |
| 87 | rc = (skb->data[skb->len - 2] - (crc & 0xFF)) + |
| 88 | (skb->data[skb->len - 1] - ((crc >> 8) & 0xFF)); |
| 89 | |
| 90 | if (rc) |
| 91 | return -EIO; |
| 92 | |
| 93 | skb_trim(skb, skb->len - 2); |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 98 | static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on) |
| 99 | { |
| 100 | ddev->ops->switch_rf(ddev, on); |
| 101 | } |
| 102 | |
| 103 | static inline void digital_abort_cmd(struct nfc_digital_dev *ddev) |
| 104 | { |
| 105 | ddev->ops->abort_cmd(ddev); |
| 106 | } |
| 107 | |
| 108 | static void digital_wq_cmd_complete(struct work_struct *work) |
| 109 | { |
| 110 | struct digital_cmd *cmd; |
| 111 | struct nfc_digital_dev *ddev = container_of(work, |
| 112 | struct nfc_digital_dev, |
| 113 | cmd_complete_work); |
| 114 | |
| 115 | mutex_lock(&ddev->cmd_lock); |
| 116 | |
| 117 | cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
| 118 | queue); |
| 119 | if (!cmd) { |
| 120 | mutex_unlock(&ddev->cmd_lock); |
| 121 | return; |
| 122 | } |
| 123 | |
| 124 | list_del(&cmd->queue); |
| 125 | |
| 126 | mutex_unlock(&ddev->cmd_lock); |
| 127 | |
| 128 | if (!IS_ERR(cmd->resp)) |
| 129 | print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1, |
| 130 | cmd->resp->data, cmd->resp->len, false); |
| 131 | |
| 132 | cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp); |
| 133 | |
| 134 | kfree(cmd); |
| 135 | |
| 136 | schedule_work(&ddev->cmd_work); |
| 137 | } |
| 138 | |
| 139 | static void digital_send_cmd_complete(struct nfc_digital_dev *ddev, |
| 140 | void *arg, struct sk_buff *resp) |
| 141 | { |
| 142 | struct digital_cmd *cmd = arg; |
| 143 | |
| 144 | cmd->resp = resp; |
| 145 | |
| 146 | schedule_work(&ddev->cmd_complete_work); |
| 147 | } |
| 148 | |
| 149 | static void digital_wq_cmd(struct work_struct *work) |
| 150 | { |
| 151 | int rc; |
| 152 | struct digital_cmd *cmd; |
| 153 | struct nfc_digital_dev *ddev = container_of(work, |
| 154 | struct nfc_digital_dev, |
| 155 | cmd_work); |
| 156 | |
| 157 | mutex_lock(&ddev->cmd_lock); |
| 158 | |
| 159 | cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd, |
| 160 | queue); |
| 161 | if (!cmd || cmd->pending) { |
| 162 | mutex_unlock(&ddev->cmd_lock); |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | mutex_unlock(&ddev->cmd_lock); |
| 167 | |
| 168 | if (cmd->req) |
| 169 | print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1, |
| 170 | cmd->req->data, cmd->req->len, false); |
| 171 | |
| 172 | switch (cmd->type) { |
| 173 | case DIGITAL_CMD_IN_SEND: |
| 174 | rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout, |
| 175 | digital_send_cmd_complete, cmd); |
| 176 | break; |
| 177 | default: |
| 178 | PR_ERR("Unknown cmd type %d", cmd->type); |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | if (!rc) |
| 183 | return; |
| 184 | |
| 185 | PR_ERR("in_send_command returned err %d", rc); |
| 186 | |
| 187 | mutex_lock(&ddev->cmd_lock); |
| 188 | list_del(&cmd->queue); |
| 189 | mutex_unlock(&ddev->cmd_lock); |
| 190 | |
| 191 | kfree_skb(cmd->req); |
| 192 | kfree(cmd); |
| 193 | |
| 194 | schedule_work(&ddev->cmd_work); |
| 195 | } |
| 196 | |
| 197 | int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type, |
| 198 | struct sk_buff *skb, u16 timeout, |
| 199 | nfc_digital_cmd_complete_t cmd_cb, void *cb_context) |
| 200 | { |
| 201 | struct digital_cmd *cmd; |
| 202 | |
| 203 | cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL); |
| 204 | if (!cmd) |
| 205 | return -ENOMEM; |
| 206 | |
| 207 | cmd->type = cmd_type; |
| 208 | cmd->timeout = timeout; |
| 209 | cmd->req = skb; |
| 210 | cmd->cmd_cb = cmd_cb; |
| 211 | cmd->cb_context = cb_context; |
| 212 | INIT_LIST_HEAD(&cmd->queue); |
| 213 | |
| 214 | mutex_lock(&ddev->cmd_lock); |
| 215 | list_add_tail(&cmd->queue, &ddev->cmd_queue); |
| 216 | mutex_unlock(&ddev->cmd_lock); |
| 217 | |
| 218 | schedule_work(&ddev->cmd_work); |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param) |
| 224 | { |
| 225 | int rc; |
| 226 | |
| 227 | rc = ddev->ops->in_configure_hw(ddev, type, param); |
| 228 | if (rc) |
| 229 | PR_ERR("in_configure_hw failed: %d", rc); |
| 230 | |
| 231 | return rc; |
| 232 | } |
| 233 | |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 234 | int digital_target_found(struct nfc_digital_dev *ddev, |
| 235 | struct nfc_target *target, u8 protocol) |
| 236 | { |
| 237 | int rc; |
| 238 | u8 framing; |
| 239 | u8 rf_tech; |
| 240 | int (*check_crc)(struct sk_buff *skb); |
| 241 | void (*add_crc)(struct sk_buff *skb); |
| 242 | |
| 243 | rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech; |
| 244 | |
| 245 | switch (protocol) { |
| 246 | case NFC_PROTO_JEWEL: |
| 247 | framing = NFC_DIGITAL_FRAMING_NFCA_T1T; |
| 248 | check_crc = digital_skb_check_crc_b; |
| 249 | add_crc = digital_skb_add_crc_b; |
| 250 | break; |
| 251 | |
| 252 | case NFC_PROTO_MIFARE: |
| 253 | framing = NFC_DIGITAL_FRAMING_NFCA_T2T; |
| 254 | check_crc = digital_skb_check_crc_a; |
| 255 | add_crc = digital_skb_add_crc_a; |
| 256 | break; |
| 257 | |
Thierry Escande | 8c0695e4 | 2013-09-19 17:55:28 +0200 | [diff] [blame] | 258 | case NFC_PROTO_FELICA: |
| 259 | framing = NFC_DIGITAL_FRAMING_NFCF_T3T; |
| 260 | check_crc = digital_skb_check_crc_f; |
| 261 | add_crc = digital_skb_add_crc_f; |
| 262 | break; |
| 263 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 264 | case NFC_PROTO_NFC_DEP: |
| 265 | if (rf_tech == NFC_DIGITAL_RF_TECH_106A) { |
| 266 | framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP; |
| 267 | check_crc = digital_skb_check_crc_a; |
| 268 | add_crc = digital_skb_add_crc_a; |
| 269 | } else { |
| 270 | framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP; |
| 271 | check_crc = digital_skb_check_crc_f; |
| 272 | add_crc = digital_skb_add_crc_f; |
| 273 | } |
| 274 | break; |
| 275 | |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 276 | default: |
| 277 | PR_ERR("Invalid protocol %d", protocol); |
| 278 | return -EINVAL; |
| 279 | } |
| 280 | |
| 281 | PR_DBG("rf_tech=%d, protocol=%d", rf_tech, protocol); |
| 282 | |
| 283 | ddev->curr_rf_tech = rf_tech; |
| 284 | ddev->curr_protocol = protocol; |
| 285 | |
| 286 | if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) { |
| 287 | ddev->skb_add_crc = digital_skb_add_crc_none; |
| 288 | ddev->skb_check_crc = digital_skb_check_crc_none; |
| 289 | } else { |
| 290 | ddev->skb_add_crc = add_crc; |
| 291 | ddev->skb_check_crc = check_crc; |
| 292 | } |
| 293 | |
| 294 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing); |
| 295 | if (rc) |
| 296 | return rc; |
| 297 | |
| 298 | target->supported_protocols = (1 << protocol); |
| 299 | rc = nfc_targets_found(ddev->nfc_dev, target, 1); |
| 300 | if (rc) |
| 301 | return rc; |
| 302 | |
| 303 | ddev->poll_tech_count = 0; |
| 304 | |
| 305 | return 0; |
| 306 | } |
| 307 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 308 | void digital_poll_next_tech(struct nfc_digital_dev *ddev) |
| 309 | { |
| 310 | digital_switch_rf(ddev, 0); |
| 311 | |
| 312 | mutex_lock(&ddev->poll_lock); |
| 313 | |
| 314 | if (!ddev->poll_tech_count) { |
| 315 | mutex_unlock(&ddev->poll_lock); |
| 316 | return; |
| 317 | } |
| 318 | |
| 319 | ddev->poll_tech_index = (ddev->poll_tech_index + 1) % |
| 320 | ddev->poll_tech_count; |
| 321 | |
| 322 | mutex_unlock(&ddev->poll_lock); |
| 323 | |
| 324 | schedule_work(&ddev->poll_work); |
| 325 | } |
| 326 | |
| 327 | static void digital_wq_poll(struct work_struct *work) |
| 328 | { |
| 329 | int rc; |
| 330 | struct digital_poll_tech *poll_tech; |
| 331 | struct nfc_digital_dev *ddev = container_of(work, |
| 332 | struct nfc_digital_dev, |
| 333 | poll_work); |
| 334 | mutex_lock(&ddev->poll_lock); |
| 335 | |
| 336 | if (!ddev->poll_tech_count) { |
| 337 | mutex_unlock(&ddev->poll_lock); |
| 338 | return; |
| 339 | } |
| 340 | |
| 341 | poll_tech = &ddev->poll_techs[ddev->poll_tech_index]; |
| 342 | |
| 343 | mutex_unlock(&ddev->poll_lock); |
| 344 | |
| 345 | rc = poll_tech->poll_func(ddev, poll_tech->rf_tech); |
| 346 | if (rc) |
| 347 | digital_poll_next_tech(ddev); |
| 348 | } |
| 349 | |
| 350 | static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech, |
| 351 | digital_poll_t poll_func) |
| 352 | { |
| 353 | struct digital_poll_tech *poll_tech; |
| 354 | |
| 355 | if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX) |
| 356 | return; |
| 357 | |
| 358 | poll_tech = &ddev->poll_techs[ddev->poll_tech_count++]; |
| 359 | |
| 360 | poll_tech->rf_tech = rf_tech; |
| 361 | poll_tech->poll_func = poll_func; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * start_poll operation |
| 366 | * |
| 367 | * For every supported protocol, the corresponding polling function is added |
| 368 | * to the table of polling technologies (ddev->poll_techs[]) using |
| 369 | * digital_add_poll_tech(). |
| 370 | * When a polling function fails (by timeout or protocol error) the next one is |
| 371 | * schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work). |
| 372 | */ |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 373 | static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols, |
| 374 | __u32 tm_protocols) |
| 375 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 376 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 377 | u32 matching_im_protocols, matching_tm_protocols; |
| 378 | |
| 379 | PR_DBG("protocols: im 0x%x, tm 0x%x, supported 0x%x", im_protocols, |
| 380 | tm_protocols, ddev->protocols); |
| 381 | |
| 382 | matching_im_protocols = ddev->protocols & im_protocols; |
| 383 | matching_tm_protocols = ddev->protocols & tm_protocols; |
| 384 | |
| 385 | if (!matching_im_protocols && !matching_tm_protocols) { |
| 386 | PR_ERR("No known protocol"); |
| 387 | return -EINVAL; |
| 388 | } |
| 389 | |
| 390 | if (ddev->poll_tech_count) { |
| 391 | PR_ERR("Already polling"); |
| 392 | return -EBUSY; |
| 393 | } |
| 394 | |
| 395 | if (ddev->curr_protocol) { |
| 396 | PR_ERR("A target is already active"); |
| 397 | return -EBUSY; |
| 398 | } |
| 399 | |
| 400 | ddev->poll_tech_count = 0; |
| 401 | ddev->poll_tech_index = 0; |
| 402 | |
| 403 | if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH) |
| 404 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A, |
| 405 | digital_in_send_sens_req); |
| 406 | |
Thierry Escande | 8c0695e4 | 2013-09-19 17:55:28 +0200 | [diff] [blame] | 407 | if (im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) { |
| 408 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F, |
| 409 | digital_in_send_sensf_req); |
| 410 | |
| 411 | digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F, |
| 412 | digital_in_send_sensf_req); |
| 413 | } |
| 414 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 415 | if (!ddev->poll_tech_count) { |
| 416 | PR_ERR("Unsupported protocols: im=0x%x, tm=0x%x", |
| 417 | matching_im_protocols, matching_tm_protocols); |
| 418 | return -EINVAL; |
| 419 | } |
| 420 | |
| 421 | schedule_work(&ddev->poll_work); |
| 422 | |
| 423 | return 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | static void digital_stop_poll(struct nfc_dev *nfc_dev) |
| 427 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 428 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 429 | |
| 430 | mutex_lock(&ddev->poll_lock); |
| 431 | |
| 432 | if (!ddev->poll_tech_count) { |
| 433 | PR_ERR("Polling operation was not running"); |
| 434 | mutex_unlock(&ddev->poll_lock); |
| 435 | return; |
| 436 | } |
| 437 | |
| 438 | ddev->poll_tech_count = 0; |
| 439 | |
| 440 | mutex_unlock(&ddev->poll_lock); |
| 441 | |
| 442 | cancel_work_sync(&ddev->poll_work); |
| 443 | |
| 444 | digital_abort_cmd(ddev); |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | static int digital_dev_up(struct nfc_dev *nfc_dev) |
| 448 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 449 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 450 | |
| 451 | digital_switch_rf(ddev, 1); |
| 452 | |
| 453 | return 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | static int digital_dev_down(struct nfc_dev *nfc_dev) |
| 457 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 458 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 459 | |
| 460 | digital_switch_rf(ddev, 0); |
| 461 | |
| 462 | return 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | static int digital_dep_link_up(struct nfc_dev *nfc_dev, |
| 466 | struct nfc_target *target, |
| 467 | __u8 comm_mode, __u8 *gb, size_t gb_len) |
| 468 | { |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 469 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 470 | |
| 471 | return digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len); |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | static int digital_dep_link_down(struct nfc_dev *nfc_dev) |
| 475 | { |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 476 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 477 | |
| 478 | ddev->curr_protocol = 0; |
| 479 | |
| 480 | return 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 481 | } |
| 482 | |
| 483 | static int digital_activate_target(struct nfc_dev *nfc_dev, |
| 484 | struct nfc_target *target, __u32 protocol) |
| 485 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 486 | return 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 487 | } |
| 488 | |
| 489 | static void digital_deactivate_target(struct nfc_dev *nfc_dev, |
| 490 | struct nfc_target *target) |
| 491 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 492 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 493 | |
| 494 | ddev->curr_protocol = 0; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb) |
| 498 | { |
| 499 | return -EOPNOTSUPP; |
| 500 | } |
| 501 | |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 502 | static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg, |
| 503 | struct sk_buff *resp) |
| 504 | { |
| 505 | struct digital_data_exch *data_exch = arg; |
| 506 | int rc; |
| 507 | |
| 508 | if (IS_ERR(resp)) { |
| 509 | rc = PTR_ERR(resp); |
| 510 | goto done; |
| 511 | } |
| 512 | |
| 513 | if (ddev->curr_protocol == NFC_PROTO_MIFARE) |
| 514 | rc = digital_in_recv_mifare_res(resp); |
| 515 | else |
| 516 | rc = ddev->skb_check_crc(resp); |
| 517 | |
| 518 | if (rc) { |
| 519 | kfree_skb(resp); |
| 520 | resp = NULL; |
| 521 | } |
| 522 | |
| 523 | done: |
| 524 | data_exch->cb(data_exch->cb_context, resp, rc); |
| 525 | |
| 526 | kfree(data_exch); |
| 527 | } |
| 528 | |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 529 | static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target, |
| 530 | struct sk_buff *skb, data_exchange_cb_t cb, |
| 531 | void *cb_context) |
| 532 | { |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 533 | struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev); |
| 534 | struct digital_data_exch *data_exch; |
| 535 | |
| 536 | data_exch = kzalloc(sizeof(struct digital_data_exch), GFP_KERNEL); |
| 537 | if (!data_exch) { |
| 538 | PR_ERR("Failed to allocate data_exch struct"); |
| 539 | return -ENOMEM; |
| 540 | } |
| 541 | |
| 542 | data_exch->cb = cb; |
| 543 | data_exch->cb_context = cb_context; |
| 544 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 545 | if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) |
| 546 | return digital_in_send_dep_req(ddev, target, skb, data_exch); |
| 547 | |
Thierry Escande | 2c66dae | 2013-09-19 17:55:27 +0200 | [diff] [blame] | 548 | ddev->skb_add_crc(skb); |
| 549 | |
| 550 | return digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete, |
| 551 | data_exch); |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | static struct nfc_ops digital_nfc_ops = { |
| 555 | .dev_up = digital_dev_up, |
| 556 | .dev_down = digital_dev_down, |
| 557 | .start_poll = digital_start_poll, |
| 558 | .stop_poll = digital_stop_poll, |
| 559 | .dep_link_up = digital_dep_link_up, |
| 560 | .dep_link_down = digital_dep_link_down, |
| 561 | .activate_target = digital_activate_target, |
| 562 | .deactivate_target = digital_deactivate_target, |
| 563 | .tm_send = digital_tg_send, |
| 564 | .im_transceive = digital_in_send, |
| 565 | }; |
| 566 | |
| 567 | struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops, |
| 568 | __u32 supported_protocols, |
| 569 | __u32 driver_capabilities, |
| 570 | int tx_headroom, int tx_tailroom) |
| 571 | { |
| 572 | struct nfc_digital_dev *ddev; |
| 573 | |
| 574 | if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen || |
| 575 | !ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd || |
| 576 | !ops->switch_rf) |
| 577 | return NULL; |
| 578 | |
| 579 | ddev = kzalloc(sizeof(struct nfc_digital_dev), GFP_KERNEL); |
| 580 | if (!ddev) { |
| 581 | PR_ERR("kzalloc failed"); |
| 582 | return NULL; |
| 583 | } |
| 584 | |
| 585 | ddev->driver_capabilities = driver_capabilities; |
| 586 | ddev->ops = ops; |
| 587 | |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 588 | mutex_init(&ddev->cmd_lock); |
| 589 | INIT_LIST_HEAD(&ddev->cmd_queue); |
| 590 | |
| 591 | INIT_WORK(&ddev->cmd_work, digital_wq_cmd); |
| 592 | INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete); |
| 593 | |
| 594 | mutex_init(&ddev->poll_lock); |
| 595 | INIT_WORK(&ddev->poll_work, digital_wq_poll); |
| 596 | |
| 597 | if (supported_protocols & NFC_PROTO_JEWEL_MASK) |
| 598 | ddev->protocols |= NFC_PROTO_JEWEL_MASK; |
| 599 | if (supported_protocols & NFC_PROTO_MIFARE_MASK) |
| 600 | ddev->protocols |= NFC_PROTO_MIFARE_MASK; |
Thierry Escande | 8c0695e4 | 2013-09-19 17:55:28 +0200 | [diff] [blame] | 601 | if (supported_protocols & NFC_PROTO_FELICA_MASK) |
| 602 | ddev->protocols |= NFC_PROTO_FELICA_MASK; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame^] | 603 | if (supported_protocols & NFC_PROTO_NFC_DEP_MASK) |
| 604 | ddev->protocols |= NFC_PROTO_NFC_DEP_MASK; |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 605 | |
| 606 | ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN; |
| 607 | ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN; |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 608 | |
| 609 | ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols, |
| 610 | ddev->tx_headroom, |
| 611 | ddev->tx_tailroom); |
| 612 | if (!ddev->nfc_dev) { |
| 613 | PR_ERR("nfc_allocate_device failed"); |
| 614 | goto free_dev; |
| 615 | } |
| 616 | |
| 617 | nfc_set_drvdata(ddev->nfc_dev, ddev); |
| 618 | |
| 619 | return ddev; |
| 620 | |
| 621 | free_dev: |
| 622 | kfree(ddev); |
| 623 | |
| 624 | return NULL; |
| 625 | } |
| 626 | EXPORT_SYMBOL(nfc_digital_allocate_device); |
| 627 | |
| 628 | void nfc_digital_free_device(struct nfc_digital_dev *ddev) |
| 629 | { |
| 630 | nfc_free_device(ddev->nfc_dev); |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 631 | kfree(ddev); |
| 632 | } |
| 633 | EXPORT_SYMBOL(nfc_digital_free_device); |
| 634 | |
| 635 | int nfc_digital_register_device(struct nfc_digital_dev *ddev) |
| 636 | { |
| 637 | return nfc_register_device(ddev->nfc_dev); |
| 638 | } |
| 639 | EXPORT_SYMBOL(nfc_digital_register_device); |
| 640 | |
| 641 | void nfc_digital_unregister_device(struct nfc_digital_dev *ddev) |
| 642 | { |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 643 | struct digital_cmd *cmd, *n; |
| 644 | |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 645 | nfc_unregister_device(ddev->nfc_dev); |
Thierry Escande | 59ee236 | 2013-09-19 17:55:26 +0200 | [diff] [blame] | 646 | |
| 647 | mutex_lock(&ddev->poll_lock); |
| 648 | ddev->poll_tech_count = 0; |
| 649 | mutex_unlock(&ddev->poll_lock); |
| 650 | |
| 651 | cancel_work_sync(&ddev->poll_work); |
| 652 | cancel_work_sync(&ddev->cmd_work); |
| 653 | cancel_work_sync(&ddev->cmd_complete_work); |
| 654 | |
| 655 | list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) { |
| 656 | list_del(&cmd->queue); |
| 657 | kfree(cmd); |
| 658 | } |
Thierry Escande | 4b10884eb | 2013-09-19 17:55:25 +0200 | [diff] [blame] | 659 | } |
| 660 | EXPORT_SYMBOL(nfc_digital_unregister_device); |
| 661 | |
| 662 | MODULE_LICENSE("GPL"); |