Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +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 | |
Samuel Ortiz | c5da0e4 | 2013-09-20 09:05:48 +0200 | [diff] [blame] | 16 | #define pr_fmt(fmt) "digital: %s: " fmt, __func__ |
| 17 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 18 | #include "digital.h" |
| 19 | |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 20 | #define DIGITAL_NFC_DEP_N_RETRY_NACK 2 |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 21 | #define DIGITAL_NFC_DEP_N_RETRY_ATN 2 |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 22 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 23 | #define DIGITAL_NFC_DEP_FRAME_DIR_OUT 0xD4 |
| 24 | #define DIGITAL_NFC_DEP_FRAME_DIR_IN 0xD5 |
| 25 | |
| 26 | #define DIGITAL_NFC_DEP_NFCA_SOD_SB 0xF0 |
| 27 | |
| 28 | #define DIGITAL_CMD_ATR_REQ 0x00 |
| 29 | #define DIGITAL_CMD_ATR_RES 0x01 |
| 30 | #define DIGITAL_CMD_PSL_REQ 0x04 |
| 31 | #define DIGITAL_CMD_PSL_RES 0x05 |
| 32 | #define DIGITAL_CMD_DEP_REQ 0x06 |
| 33 | #define DIGITAL_CMD_DEP_RES 0x07 |
| 34 | |
| 35 | #define DIGITAL_ATR_REQ_MIN_SIZE 16 |
| 36 | #define DIGITAL_ATR_REQ_MAX_SIZE 64 |
| 37 | |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 38 | #define DIGITAL_DID_MAX 14 |
| 39 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 40 | #define DIGITAL_PAYLOAD_SIZE_MAX 254 |
| 41 | #define DIGITAL_PAYLOAD_BITS_TO_PP(s) (((s) & 0x3) << 4) |
| 42 | #define DIGITAL_PAYLOAD_PP_TO_BITS(s) (((s) >> 4) & 0x3) |
| 43 | #define DIGITAL_PAYLOAD_BITS_TO_FSL(s) ((s) & 0x3) |
| 44 | #define DIGITAL_PAYLOAD_FSL_TO_BITS(s) ((s) & 0x3) |
| 45 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 46 | #define DIGITAL_GB_BIT 0x02 |
| 47 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 48 | #define DIGITAL_NFC_DEP_REQ_RES_HEADROOM 2 /* SoD: [SB (NFC-A)] + LEN */ |
| 49 | #define DIGITAL_NFC_DEP_REQ_RES_TAILROOM 2 /* EoD: 2-byte CRC */ |
| 50 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 51 | #define DIGITAL_NFC_DEP_PFB_TYPE(pfb) ((pfb) & 0xE0) |
| 52 | |
| 53 | #define DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT 0x10 |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 54 | #define DIGITAL_NFC_DEP_PFB_MI_BIT 0x10 |
| 55 | #define DIGITAL_NFC_DEP_PFB_NACK_BIT 0x10 |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 56 | #define DIGITAL_NFC_DEP_PFB_DID_BIT 0x04 |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 57 | |
| 58 | #define DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb) \ |
| 59 | ((pfb) & DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT) |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 60 | #define DIGITAL_NFC_DEP_MI_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_MI_BIT) |
| 61 | #define DIGITAL_NFC_DEP_NACK_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_NACK_BIT) |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 62 | #define DIGITAL_NFC_DEP_NAD_BIT_SET(pfb) ((pfb) & 0x08) |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 63 | #define DIGITAL_NFC_DEP_DID_BIT_SET(pfb) ((pfb) & DIGITAL_NFC_DEP_PFB_DID_BIT) |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 64 | #define DIGITAL_NFC_DEP_PFB_PNI(pfb) ((pfb) & 0x03) |
| 65 | |
| 66 | #define DIGITAL_NFC_DEP_PFB_I_PDU 0x00 |
| 67 | #define DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU 0x40 |
| 68 | #define DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU 0x80 |
| 69 | |
| 70 | struct digital_atr_req { |
| 71 | u8 dir; |
| 72 | u8 cmd; |
| 73 | u8 nfcid3[10]; |
| 74 | u8 did; |
| 75 | u8 bs; |
| 76 | u8 br; |
| 77 | u8 pp; |
| 78 | u8 gb[0]; |
| 79 | } __packed; |
| 80 | |
| 81 | struct digital_atr_res { |
| 82 | u8 dir; |
| 83 | u8 cmd; |
| 84 | u8 nfcid3[10]; |
| 85 | u8 did; |
| 86 | u8 bs; |
| 87 | u8 br; |
| 88 | u8 to; |
| 89 | u8 pp; |
| 90 | u8 gb[0]; |
| 91 | } __packed; |
| 92 | |
| 93 | struct digital_psl_req { |
| 94 | u8 dir; |
| 95 | u8 cmd; |
| 96 | u8 did; |
| 97 | u8 brs; |
| 98 | u8 fsl; |
| 99 | } __packed; |
| 100 | |
| 101 | struct digital_psl_res { |
| 102 | u8 dir; |
| 103 | u8 cmd; |
| 104 | u8 did; |
| 105 | } __packed; |
| 106 | |
| 107 | struct digital_dep_req_res { |
| 108 | u8 dir; |
| 109 | u8 cmd; |
| 110 | u8 pfb; |
| 111 | } __packed; |
| 112 | |
| 113 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
| 114 | struct sk_buff *resp); |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 115 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
| 116 | struct sk_buff *resp); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 117 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 118 | static const u8 digital_payload_bits_map[4] = { |
| 119 | [0] = 64, |
| 120 | [1] = 128, |
| 121 | [2] = 192, |
| 122 | [3] = 254 |
| 123 | }; |
| 124 | |
| 125 | static u8 digital_payload_bits_to_size(u8 payload_bits) |
| 126 | { |
| 127 | if (payload_bits >= ARRAY_SIZE(digital_payload_bits_map)) |
| 128 | return 0; |
| 129 | |
| 130 | return digital_payload_bits_map[payload_bits]; |
| 131 | } |
| 132 | |
| 133 | static u8 digital_payload_size_to_bits(u8 payload_size) |
| 134 | { |
| 135 | int i; |
| 136 | |
| 137 | for (i = 0; i < ARRAY_SIZE(digital_payload_bits_map); i++) |
| 138 | if (digital_payload_bits_map[i] == payload_size) |
| 139 | return i; |
| 140 | |
| 141 | return 0xff; |
| 142 | } |
| 143 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 144 | static void digital_skb_push_dep_sod(struct nfc_digital_dev *ddev, |
| 145 | struct sk_buff *skb) |
| 146 | { |
| 147 | skb_push(skb, sizeof(u8)); |
| 148 | |
| 149 | skb->data[0] = skb->len; |
| 150 | |
| 151 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
| 152 | *skb_push(skb, sizeof(u8)) = DIGITAL_NFC_DEP_NFCA_SOD_SB; |
| 153 | } |
| 154 | |
| 155 | static int digital_skb_pull_dep_sod(struct nfc_digital_dev *ddev, |
| 156 | struct sk_buff *skb) |
| 157 | { |
| 158 | u8 size; |
| 159 | |
| 160 | if (skb->len < 2) |
| 161 | return -EIO; |
| 162 | |
| 163 | if (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A) |
| 164 | skb_pull(skb, sizeof(u8)); |
| 165 | |
| 166 | size = skb->data[0]; |
| 167 | if (size != skb->len) |
| 168 | return -EIO; |
| 169 | |
| 170 | skb_pull(skb, sizeof(u8)); |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 175 | static struct sk_buff * |
| 176 | digital_send_dep_data_prep(struct nfc_digital_dev *ddev, struct sk_buff *skb, |
| 177 | struct digital_dep_req_res *dep_req_res, |
| 178 | struct digital_data_exch *data_exch) |
| 179 | { |
| 180 | struct sk_buff *new_skb; |
| 181 | |
| 182 | if (skb->len > ddev->remote_payload_max) { |
| 183 | dep_req_res->pfb |= DIGITAL_NFC_DEP_PFB_MI_BIT; |
| 184 | |
| 185 | new_skb = digital_skb_alloc(ddev, ddev->remote_payload_max); |
| 186 | if (!new_skb) { |
| 187 | kfree_skb(ddev->chaining_skb); |
| 188 | ddev->chaining_skb = NULL; |
| 189 | |
| 190 | return ERR_PTR(-ENOMEM); |
| 191 | } |
| 192 | |
| 193 | skb_reserve(new_skb, ddev->tx_headroom + NFC_HEADER_SIZE + |
| 194 | DIGITAL_NFC_DEP_REQ_RES_HEADROOM); |
| 195 | memcpy(skb_put(new_skb, ddev->remote_payload_max), skb->data, |
| 196 | ddev->remote_payload_max); |
| 197 | skb_pull(skb, ddev->remote_payload_max); |
| 198 | |
| 199 | ddev->chaining_skb = skb; |
| 200 | ddev->data_exch = data_exch; |
| 201 | } else { |
| 202 | ddev->chaining_skb = NULL; |
| 203 | new_skb = skb; |
| 204 | } |
| 205 | |
| 206 | return new_skb; |
| 207 | } |
| 208 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 209 | static struct sk_buff * |
| 210 | digital_recv_dep_data_gather(struct nfc_digital_dev *ddev, u8 pfb, |
| 211 | struct sk_buff *resp, |
| 212 | int (*send_ack)(struct nfc_digital_dev *ddev, |
| 213 | struct digital_data_exch |
| 214 | *data_exch), |
| 215 | struct digital_data_exch *data_exch) |
| 216 | { |
| 217 | struct sk_buff *new_skb; |
| 218 | int rc; |
| 219 | |
| 220 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb) && (!ddev->chaining_skb)) { |
| 221 | ddev->chaining_skb = |
| 222 | nfc_alloc_recv_skb(8 * ddev->local_payload_max, |
| 223 | GFP_KERNEL); |
| 224 | if (!ddev->chaining_skb) { |
| 225 | rc = -ENOMEM; |
| 226 | goto error; |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | if (ddev->chaining_skb) { |
| 231 | if (resp->len > skb_tailroom(ddev->chaining_skb)) { |
| 232 | new_skb = skb_copy_expand(ddev->chaining_skb, |
| 233 | skb_headroom( |
| 234 | ddev->chaining_skb), |
| 235 | 8 * ddev->local_payload_max, |
| 236 | GFP_KERNEL); |
| 237 | if (!new_skb) { |
| 238 | rc = -ENOMEM; |
| 239 | goto error; |
| 240 | } |
| 241 | |
| 242 | kfree_skb(ddev->chaining_skb); |
| 243 | ddev->chaining_skb = new_skb; |
| 244 | } |
| 245 | |
| 246 | memcpy(skb_put(ddev->chaining_skb, resp->len), resp->data, |
| 247 | resp->len); |
| 248 | |
| 249 | kfree_skb(resp); |
| 250 | resp = NULL; |
| 251 | |
| 252 | if (DIGITAL_NFC_DEP_MI_BIT_SET(pfb)) { |
| 253 | rc = send_ack(ddev, data_exch); |
| 254 | if (rc) |
| 255 | goto error; |
| 256 | |
| 257 | return NULL; |
| 258 | } |
| 259 | |
| 260 | resp = ddev->chaining_skb; |
| 261 | ddev->chaining_skb = NULL; |
| 262 | } |
| 263 | |
| 264 | return resp; |
| 265 | |
| 266 | error: |
| 267 | kfree_skb(resp); |
| 268 | |
| 269 | kfree_skb(ddev->chaining_skb); |
| 270 | ddev->chaining_skb = NULL; |
| 271 | |
| 272 | return ERR_PTR(rc); |
| 273 | } |
| 274 | |
Mark A. Greer | dddb3da | 2014-07-22 20:18:01 -0700 | [diff] [blame] | 275 | static void digital_in_recv_psl_res(struct nfc_digital_dev *ddev, void *arg, |
| 276 | struct sk_buff *resp) |
| 277 | { |
| 278 | struct nfc_target *target = arg; |
| 279 | struct digital_psl_res *psl_res; |
| 280 | int rc; |
| 281 | |
| 282 | if (IS_ERR(resp)) { |
| 283 | rc = PTR_ERR(resp); |
| 284 | resp = NULL; |
| 285 | goto exit; |
| 286 | } |
| 287 | |
| 288 | rc = ddev->skb_check_crc(resp); |
| 289 | if (rc) { |
| 290 | PROTOCOL_ERR("14.4.1.6"); |
| 291 | goto exit; |
| 292 | } |
| 293 | |
| 294 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 295 | if (rc) { |
| 296 | PROTOCOL_ERR("14.4.1.2"); |
| 297 | goto exit; |
| 298 | } |
| 299 | |
| 300 | psl_res = (struct digital_psl_res *)resp->data; |
| 301 | |
| 302 | if ((resp->len != sizeof(*psl_res)) || |
| 303 | (psl_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN) || |
| 304 | (psl_res->cmd != DIGITAL_CMD_PSL_RES)) { |
| 305 | rc = -EIO; |
| 306 | goto exit; |
| 307 | } |
| 308 | |
| 309 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, |
| 310 | NFC_DIGITAL_RF_TECH_424F); |
| 311 | if (rc) |
| 312 | goto exit; |
| 313 | |
| 314 | rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
| 315 | NFC_DIGITAL_FRAMING_NFCF_NFC_DEP); |
| 316 | if (rc) |
| 317 | goto exit; |
| 318 | |
| 319 | if (!DIGITAL_DRV_CAPS_IN_CRC(ddev) && |
| 320 | (ddev->curr_rf_tech == NFC_DIGITAL_RF_TECH_106A)) { |
| 321 | ddev->skb_add_crc = digital_skb_add_crc_f; |
| 322 | ddev->skb_check_crc = digital_skb_check_crc_f; |
| 323 | } |
| 324 | |
| 325 | ddev->curr_rf_tech = NFC_DIGITAL_RF_TECH_424F; |
| 326 | |
| 327 | nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
| 328 | NFC_RF_INITIATOR); |
| 329 | |
| 330 | ddev->curr_nfc_dep_pni = 0; |
| 331 | |
| 332 | exit: |
| 333 | dev_kfree_skb(resp); |
| 334 | |
| 335 | if (rc) |
| 336 | ddev->curr_protocol = 0; |
| 337 | } |
| 338 | |
| 339 | static int digital_in_send_psl_req(struct nfc_digital_dev *ddev, |
| 340 | struct nfc_target *target) |
| 341 | { |
| 342 | struct sk_buff *skb; |
| 343 | struct digital_psl_req *psl_req; |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 344 | int rc; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 345 | u8 payload_size, payload_bits; |
Mark A. Greer | dddb3da | 2014-07-22 20:18:01 -0700 | [diff] [blame] | 346 | |
| 347 | skb = digital_skb_alloc(ddev, sizeof(*psl_req)); |
| 348 | if (!skb) |
| 349 | return -ENOMEM; |
| 350 | |
| 351 | skb_put(skb, sizeof(*psl_req)); |
| 352 | |
| 353 | psl_req = (struct digital_psl_req *)skb->data; |
| 354 | |
| 355 | psl_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 356 | psl_req->cmd = DIGITAL_CMD_PSL_REQ; |
| 357 | psl_req->did = 0; |
| 358 | psl_req->brs = (0x2 << 3) | 0x2; /* 424F both directions */ |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 359 | |
| 360 | payload_size = min(ddev->local_payload_max, ddev->remote_payload_max); |
| 361 | payload_bits = digital_payload_size_to_bits(payload_size); |
| 362 | psl_req->fsl = DIGITAL_PAYLOAD_BITS_TO_FSL(payload_bits); |
| 363 | |
| 364 | ddev->local_payload_max = payload_size; |
| 365 | ddev->remote_payload_max = payload_size; |
Mark A. Greer | dddb3da | 2014-07-22 20:18:01 -0700 | [diff] [blame] | 366 | |
| 367 | digital_skb_push_dep_sod(ddev, skb); |
| 368 | |
| 369 | ddev->skb_add_crc(skb); |
| 370 | |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 371 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_psl_res, |
| 372 | target); |
| 373 | if (rc) |
| 374 | kfree_skb(skb); |
| 375 | |
| 376 | return rc; |
Mark A. Greer | dddb3da | 2014-07-22 20:18:01 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 379 | static void digital_in_recv_atr_res(struct nfc_digital_dev *ddev, void *arg, |
| 380 | struct sk_buff *resp) |
| 381 | { |
| 382 | struct nfc_target *target = arg; |
| 383 | struct digital_atr_res *atr_res; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 384 | u8 gb_len, payload_bits; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 385 | int rc; |
| 386 | |
| 387 | if (IS_ERR(resp)) { |
| 388 | rc = PTR_ERR(resp); |
| 389 | resp = NULL; |
| 390 | goto exit; |
| 391 | } |
| 392 | |
| 393 | rc = ddev->skb_check_crc(resp); |
| 394 | if (rc) { |
| 395 | PROTOCOL_ERR("14.4.1.6"); |
| 396 | goto exit; |
| 397 | } |
| 398 | |
| 399 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 400 | if (rc) { |
| 401 | PROTOCOL_ERR("14.4.1.2"); |
| 402 | goto exit; |
| 403 | } |
| 404 | |
| 405 | if (resp->len < sizeof(struct digital_atr_res)) { |
| 406 | rc = -EIO; |
| 407 | goto exit; |
| 408 | } |
| 409 | |
| 410 | gb_len = resp->len - sizeof(struct digital_atr_res); |
| 411 | |
| 412 | atr_res = (struct digital_atr_res *)resp->data; |
| 413 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 414 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_res->pp); |
| 415 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); |
| 416 | |
| 417 | if (!ddev->remote_payload_max) { |
| 418 | rc = -EINVAL; |
| 419 | goto exit; |
| 420 | } |
| 421 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 422 | rc = nfc_set_remote_general_bytes(ddev->nfc_dev, atr_res->gb, gb_len); |
| 423 | if (rc) |
| 424 | goto exit; |
| 425 | |
Mark A. Greer | dddb3da | 2014-07-22 20:18:01 -0700 | [diff] [blame] | 426 | if ((ddev->protocols & NFC_PROTO_FELICA_MASK) && |
| 427 | (ddev->curr_rf_tech != NFC_DIGITAL_RF_TECH_424F)) { |
| 428 | rc = digital_in_send_psl_req(ddev, target); |
| 429 | if (!rc) |
| 430 | goto exit; |
| 431 | } |
| 432 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 433 | rc = nfc_dep_link_is_up(ddev->nfc_dev, target->idx, NFC_COMM_ACTIVE, |
| 434 | NFC_RF_INITIATOR); |
| 435 | |
| 436 | ddev->curr_nfc_dep_pni = 0; |
| 437 | |
| 438 | exit: |
| 439 | dev_kfree_skb(resp); |
| 440 | |
| 441 | if (rc) |
| 442 | ddev->curr_protocol = 0; |
| 443 | } |
| 444 | |
| 445 | int digital_in_send_atr_req(struct nfc_digital_dev *ddev, |
| 446 | struct nfc_target *target, __u8 comm_mode, __u8 *gb, |
| 447 | size_t gb_len) |
| 448 | { |
| 449 | struct sk_buff *skb; |
| 450 | struct digital_atr_req *atr_req; |
| 451 | uint size; |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 452 | int rc; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 453 | u8 payload_bits; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 454 | |
| 455 | size = DIGITAL_ATR_REQ_MIN_SIZE + gb_len; |
| 456 | |
| 457 | if (size > DIGITAL_ATR_REQ_MAX_SIZE) { |
| 458 | PROTOCOL_ERR("14.6.1.1"); |
| 459 | return -EINVAL; |
| 460 | } |
| 461 | |
| 462 | skb = digital_skb_alloc(ddev, size); |
| 463 | if (!skb) |
| 464 | return -ENOMEM; |
| 465 | |
| 466 | skb_put(skb, sizeof(struct digital_atr_req)); |
| 467 | |
| 468 | atr_req = (struct digital_atr_req *)skb->data; |
| 469 | memset(atr_req, 0, sizeof(struct digital_atr_req)); |
| 470 | |
| 471 | atr_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 472 | atr_req->cmd = DIGITAL_CMD_ATR_REQ; |
| 473 | if (target->nfcid2_len) |
Thierry Escande | 4f319e3 | 2014-01-02 11:58:14 +0100 | [diff] [blame] | 474 | memcpy(atr_req->nfcid3, target->nfcid2, NFC_NFCID2_MAXSIZE); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 475 | else |
Thierry Escande | 4f319e3 | 2014-01-02 11:58:14 +0100 | [diff] [blame] | 476 | get_random_bytes(atr_req->nfcid3, NFC_NFCID3_MAXSIZE); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 477 | |
| 478 | atr_req->did = 0; |
| 479 | atr_req->bs = 0; |
| 480 | atr_req->br = 0; |
| 481 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 482 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
| 483 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); |
| 484 | atr_req->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 485 | |
| 486 | if (gb_len) { |
| 487 | atr_req->pp |= DIGITAL_GB_BIT; |
| 488 | memcpy(skb_put(skb, gb_len), gb, gb_len); |
| 489 | } |
| 490 | |
| 491 | digital_skb_push_dep_sod(ddev, skb); |
| 492 | |
| 493 | ddev->skb_add_crc(skb); |
| 494 | |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 495 | rc = digital_in_send_cmd(ddev, skb, 500, digital_in_recv_atr_res, |
| 496 | target); |
| 497 | if (rc) |
| 498 | kfree_skb(skb); |
| 499 | |
| 500 | return rc; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 501 | } |
| 502 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 503 | static int digital_in_send_ack(struct nfc_digital_dev *ddev, |
| 504 | struct digital_data_exch *data_exch) |
| 505 | { |
| 506 | struct digital_dep_req_res *dep_req; |
| 507 | struct sk_buff *skb; |
| 508 | int rc; |
| 509 | |
| 510 | skb = digital_skb_alloc(ddev, 1); |
| 511 | if (!skb) |
| 512 | return -ENOMEM; |
| 513 | |
| 514 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 515 | |
| 516 | dep_req = (struct digital_dep_req_res *)skb->data; |
| 517 | |
| 518 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 519 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| 520 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| 521 | ddev->curr_nfc_dep_pni; |
| 522 | |
| 523 | digital_skb_push_dep_sod(ddev, skb); |
| 524 | |
| 525 | ddev->skb_add_crc(skb); |
| 526 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 527 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 528 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 529 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
| 530 | data_exch); |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 531 | if (rc) { |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 532 | kfree_skb(skb); |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 533 | kfree_skb(ddev->saved_skb); |
| 534 | ddev->saved_skb = NULL; |
| 535 | } |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 536 | |
| 537 | return rc; |
| 538 | } |
| 539 | |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 540 | static int digital_in_send_nack(struct nfc_digital_dev *ddev, |
| 541 | struct digital_data_exch *data_exch) |
| 542 | { |
| 543 | struct digital_dep_req_res *dep_req; |
| 544 | struct sk_buff *skb; |
| 545 | int rc; |
| 546 | |
| 547 | skb = digital_skb_alloc(ddev, 1); |
| 548 | if (!skb) |
| 549 | return -ENOMEM; |
| 550 | |
| 551 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 552 | |
| 553 | dep_req = (struct digital_dep_req_res *)skb->data; |
| 554 | |
| 555 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 556 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| 557 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| 558 | DIGITAL_NFC_DEP_PFB_NACK_BIT | ddev->curr_nfc_dep_pni; |
| 559 | |
| 560 | digital_skb_push_dep_sod(ddev, skb); |
| 561 | |
| 562 | ddev->skb_add_crc(skb); |
| 563 | |
| 564 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
| 565 | data_exch); |
| 566 | if (rc) |
| 567 | kfree_skb(skb); |
| 568 | |
| 569 | return rc; |
| 570 | } |
| 571 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 572 | static int digital_in_send_atn(struct nfc_digital_dev *ddev, |
| 573 | struct digital_data_exch *data_exch) |
| 574 | { |
| 575 | struct digital_dep_req_res *dep_req; |
| 576 | struct sk_buff *skb; |
| 577 | int rc; |
| 578 | |
| 579 | skb = digital_skb_alloc(ddev, 1); |
| 580 | if (!skb) |
| 581 | return -ENOMEM; |
| 582 | |
| 583 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 584 | |
| 585 | dep_req = (struct digital_dep_req_res *)skb->data; |
| 586 | |
| 587 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 588 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| 589 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; |
| 590 | |
| 591 | digital_skb_push_dep_sod(ddev, skb); |
| 592 | |
| 593 | ddev->skb_add_crc(skb); |
| 594 | |
| 595 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
| 596 | data_exch); |
| 597 | if (rc) |
| 598 | kfree_skb(skb); |
| 599 | |
| 600 | return rc; |
| 601 | } |
| 602 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 603 | static int digital_in_send_rtox(struct nfc_digital_dev *ddev, |
| 604 | struct digital_data_exch *data_exch, u8 rtox) |
| 605 | { |
| 606 | struct digital_dep_req_res *dep_req; |
| 607 | struct sk_buff *skb; |
| 608 | int rc; |
| 609 | |
| 610 | skb = digital_skb_alloc(ddev, 1); |
| 611 | if (!skb) |
| 612 | return -ENOMEM; |
| 613 | |
| 614 | *skb_put(skb, 1) = rtox; |
| 615 | |
| 616 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 617 | |
| 618 | dep_req = (struct digital_dep_req_res *)skb->data; |
| 619 | |
| 620 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 621 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| 622 | dep_req->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU | |
| 623 | DIGITAL_NFC_DEP_PFB_TIMEOUT_BIT; |
| 624 | |
| 625 | digital_skb_push_dep_sod(ddev, skb); |
| 626 | |
| 627 | ddev->skb_add_crc(skb); |
| 628 | |
| 629 | rc = digital_in_send_cmd(ddev, skb, 1500, digital_in_recv_dep_res, |
| 630 | data_exch); |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 631 | if (rc) |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 632 | kfree_skb(skb); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 633 | |
| 634 | return rc; |
| 635 | } |
| 636 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 637 | static int digital_in_send_saved_skb(struct nfc_digital_dev *ddev, |
| 638 | struct digital_data_exch *data_exch) |
| 639 | { |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 640 | int rc; |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 641 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 642 | if (!ddev->saved_skb) |
| 643 | return -EINVAL; |
| 644 | |
| 645 | skb_get(ddev->saved_skb); |
| 646 | |
| 647 | rc = digital_in_send_cmd(ddev, ddev->saved_skb, 1500, |
| 648 | digital_in_recv_dep_res, data_exch); |
| 649 | if (rc) |
| 650 | kfree_skb(ddev->saved_skb); |
| 651 | |
| 652 | return rc; |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 653 | } |
| 654 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 655 | static void digital_in_recv_dep_res(struct nfc_digital_dev *ddev, void *arg, |
| 656 | struct sk_buff *resp) |
| 657 | { |
| 658 | struct digital_data_exch *data_exch = arg; |
| 659 | struct digital_dep_req_res *dep_res; |
| 660 | u8 pfb; |
| 661 | uint size; |
| 662 | int rc; |
| 663 | |
| 664 | if (IS_ERR(resp)) { |
| 665 | rc = PTR_ERR(resp); |
| 666 | resp = NULL; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 667 | |
Thierry Escande | 3f89fea | 2016-06-16 20:24:42 +0200 | [diff] [blame] | 668 | if ((rc == -EIO || (rc == -ETIMEDOUT && ddev->nack_count)) && |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 669 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 670 | ddev->atn_count = 0; |
| 671 | |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 672 | rc = digital_in_send_nack(ddev, data_exch); |
| 673 | if (rc) |
| 674 | goto error; |
| 675 | |
| 676 | return; |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 677 | } else if ((rc == -ETIMEDOUT) && |
| 678 | (ddev->atn_count++ < DIGITAL_NFC_DEP_N_RETRY_ATN)) { |
| 679 | ddev->nack_count = 0; |
| 680 | |
| 681 | rc = digital_in_send_atn(ddev, data_exch); |
| 682 | if (rc) |
| 683 | goto error; |
| 684 | |
| 685 | return; |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 686 | } |
| 687 | |
| 688 | goto exit; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 692 | if (rc) { |
| 693 | PROTOCOL_ERR("14.4.1.2"); |
| 694 | goto exit; |
| 695 | } |
| 696 | |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 697 | rc = ddev->skb_check_crc(resp); |
| 698 | if (rc) { |
| 699 | if ((resp->len >= 4) && |
| 700 | (ddev->nack_count++ < DIGITAL_NFC_DEP_N_RETRY_NACK)) { |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 701 | ddev->atn_count = 0; |
| 702 | |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 703 | rc = digital_in_send_nack(ddev, data_exch); |
| 704 | if (rc) |
| 705 | goto error; |
| 706 | |
| 707 | kfree_skb(resp); |
| 708 | |
| 709 | return; |
| 710 | } |
| 711 | |
| 712 | PROTOCOL_ERR("14.4.1.6"); |
| 713 | goto error; |
| 714 | } |
| 715 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 716 | ddev->atn_count = 0; |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 717 | ddev->nack_count = 0; |
| 718 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 719 | if (resp->len > ddev->local_payload_max) { |
| 720 | rc = -EMSGSIZE; |
| 721 | goto exit; |
| 722 | } |
| 723 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 724 | size = sizeof(struct digital_dep_req_res); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 725 | dep_res = (struct digital_dep_req_res *)resp->data; |
| 726 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 727 | if (resp->len < size || dep_res->dir != DIGITAL_NFC_DEP_FRAME_DIR_IN || |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 728 | dep_res->cmd != DIGITAL_CMD_DEP_RES) { |
| 729 | rc = -EIO; |
| 730 | goto error; |
| 731 | } |
| 732 | |
| 733 | pfb = dep_res->pfb; |
| 734 | |
Mark A. Greer | 3bc3f88 | 2014-09-23 16:38:04 -0700 | [diff] [blame] | 735 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
| 736 | PROTOCOL_ERR("14.8.2.1"); |
| 737 | rc = -EIO; |
| 738 | goto error; |
| 739 | } |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 740 | |
Mark A. Greer | 3e6b0de | 2014-09-23 16:38:06 -0700 | [diff] [blame] | 741 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
| 742 | rc = -EIO; |
| 743 | goto exit; |
| 744 | } |
| 745 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 746 | if (size > resp->len) { |
| 747 | rc = -EIO; |
| 748 | goto error; |
| 749 | } |
| 750 | |
| 751 | skb_pull(resp, size); |
| 752 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 753 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
| 754 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
| 755 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
| 756 | PROTOCOL_ERR("14.12.3.3"); |
| 757 | rc = -EIO; |
| 758 | goto error; |
| 759 | } |
| 760 | |
| 761 | ddev->curr_nfc_dep_pni = |
| 762 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 763 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 764 | kfree_skb(ddev->saved_skb); |
| 765 | ddev->saved_skb = NULL; |
| 766 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 767 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
| 768 | digital_in_send_ack, |
| 769 | data_exch); |
| 770 | if (IS_ERR(resp)) { |
| 771 | rc = PTR_ERR(resp); |
| 772 | resp = NULL; |
| 773 | goto error; |
| 774 | } |
| 775 | |
| 776 | /* If resp is NULL then we're still chaining so return and |
| 777 | * wait for the next part of the PDU. Else, the PDU is |
| 778 | * complete so pass it up. |
| 779 | */ |
| 780 | if (!resp) |
| 781 | return; |
| 782 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 783 | rc = 0; |
| 784 | break; |
| 785 | |
| 786 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 787 | if (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni) { |
| 788 | PROTOCOL_ERR("14.12.3.3"); |
| 789 | rc = -EIO; |
| 790 | goto exit; |
| 791 | } |
| 792 | |
| 793 | ddev->curr_nfc_dep_pni = |
| 794 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| 795 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 796 | if (ddev->chaining_skb && !DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 797 | kfree_skb(ddev->saved_skb); |
| 798 | ddev->saved_skb = NULL; |
| 799 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 800 | rc = digital_in_send_dep_req(ddev, NULL, |
| 801 | ddev->chaining_skb, |
| 802 | ddev->data_exch); |
| 803 | if (rc) |
| 804 | goto error; |
| 805 | |
| 806 | return; |
| 807 | } |
| 808 | |
| 809 | pr_err("Received a ACK/NACK PDU\n"); |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 810 | rc = -EINVAL; |
| 811 | goto exit; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 812 | |
| 813 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 814 | if (!DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { /* ATN */ |
| 815 | rc = digital_in_send_saved_skb(ddev, data_exch); |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 816 | if (rc) |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 817 | goto error; |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 818 | |
| 819 | return; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 820 | } |
| 821 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 822 | rc = digital_in_send_rtox(ddev, data_exch, resp->data[0]); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 823 | if (rc) |
| 824 | goto error; |
| 825 | |
| 826 | kfree_skb(resp); |
| 827 | return; |
| 828 | } |
| 829 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 830 | exit: |
| 831 | data_exch->cb(data_exch->cb_context, resp, rc); |
| 832 | |
| 833 | error: |
| 834 | kfree(data_exch); |
| 835 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 836 | kfree_skb(ddev->chaining_skb); |
| 837 | ddev->chaining_skb = NULL; |
| 838 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 839 | kfree_skb(ddev->saved_skb); |
| 840 | ddev->saved_skb = NULL; |
| 841 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 842 | if (rc) |
| 843 | kfree_skb(resp); |
| 844 | } |
| 845 | |
| 846 | int digital_in_send_dep_req(struct nfc_digital_dev *ddev, |
| 847 | struct nfc_target *target, struct sk_buff *skb, |
| 848 | struct digital_data_exch *data_exch) |
| 849 | { |
| 850 | struct digital_dep_req_res *dep_req; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 851 | struct sk_buff *chaining_skb, *tmp_skb; |
| 852 | int rc; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 853 | |
| 854 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 855 | |
| 856 | dep_req = (struct digital_dep_req_res *)skb->data; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 857 | |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 858 | dep_req->dir = DIGITAL_NFC_DEP_FRAME_DIR_OUT; |
| 859 | dep_req->cmd = DIGITAL_CMD_DEP_REQ; |
| 860 | dep_req->pfb = ddev->curr_nfc_dep_pni; |
| 861 | |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 862 | ddev->atn_count = 0; |
Mark A. Greer | a80509c | 2014-09-23 16:38:11 -0700 | [diff] [blame] | 863 | ddev->nack_count = 0; |
| 864 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 865 | chaining_skb = ddev->chaining_skb; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 866 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 867 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_req, data_exch); |
| 868 | if (IS_ERR(tmp_skb)) |
| 869 | return PTR_ERR(tmp_skb); |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 870 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 871 | digital_skb_push_dep_sod(ddev, tmp_skb); |
| 872 | |
| 873 | ddev->skb_add_crc(tmp_skb); |
| 874 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 875 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 876 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 877 | rc = digital_in_send_cmd(ddev, tmp_skb, 1500, digital_in_recv_dep_res, |
| 878 | data_exch); |
| 879 | if (rc) { |
| 880 | if (tmp_skb != skb) |
| 881 | kfree_skb(tmp_skb); |
| 882 | |
| 883 | kfree_skb(chaining_skb); |
| 884 | ddev->chaining_skb = NULL; |
Mark A. Greer | 384ab1d | 2014-09-23 16:38:13 -0700 | [diff] [blame] | 885 | |
| 886 | kfree_skb(ddev->saved_skb); |
| 887 | ddev->saved_skb = NULL; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 888 | } |
| 889 | |
| 890 | return rc; |
Thierry Escande | 7d0911c | 2013-09-19 17:55:29 +0200 | [diff] [blame] | 891 | } |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 892 | |
Thierry Escande | b711ad5 | 2014-01-06 23:34:48 +0100 | [diff] [blame] | 893 | static void digital_tg_set_rf_tech(struct nfc_digital_dev *ddev, u8 rf_tech) |
| 894 | { |
| 895 | ddev->curr_rf_tech = rf_tech; |
| 896 | |
| 897 | ddev->skb_add_crc = digital_skb_add_crc_none; |
| 898 | ddev->skb_check_crc = digital_skb_check_crc_none; |
| 899 | |
| 900 | if (DIGITAL_DRV_CAPS_TG_CRC(ddev)) |
| 901 | return; |
| 902 | |
| 903 | switch (ddev->curr_rf_tech) { |
| 904 | case NFC_DIGITAL_RF_TECH_106A: |
| 905 | ddev->skb_add_crc = digital_skb_add_crc_a; |
| 906 | ddev->skb_check_crc = digital_skb_check_crc_a; |
| 907 | break; |
| 908 | |
| 909 | case NFC_DIGITAL_RF_TECH_212F: |
| 910 | case NFC_DIGITAL_RF_TECH_424F: |
| 911 | ddev->skb_add_crc = digital_skb_add_crc_f; |
| 912 | ddev->skb_check_crc = digital_skb_check_crc_f; |
| 913 | break; |
| 914 | |
| 915 | default: |
| 916 | break; |
| 917 | } |
| 918 | } |
| 919 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 920 | static int digital_tg_send_ack(struct nfc_digital_dev *ddev, |
| 921 | struct digital_data_exch *data_exch) |
| 922 | { |
| 923 | struct digital_dep_req_res *dep_res; |
| 924 | struct sk_buff *skb; |
| 925 | int rc; |
| 926 | |
| 927 | skb = digital_skb_alloc(ddev, 1); |
| 928 | if (!skb) |
| 929 | return -ENOMEM; |
| 930 | |
| 931 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 932 | |
| 933 | dep_res = (struct digital_dep_req_res *)skb->data; |
| 934 | |
| 935 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| 936 | dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| 937 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU | |
| 938 | ddev->curr_nfc_dep_pni; |
| 939 | |
| 940 | if (ddev->did) { |
| 941 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| 942 | |
| 943 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, |
| 944 | sizeof(ddev->did)); |
| 945 | } |
| 946 | |
| 947 | ddev->curr_nfc_dep_pni = |
| 948 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| 949 | |
| 950 | digital_skb_push_dep_sod(ddev, skb); |
| 951 | |
| 952 | ddev->skb_add_crc(skb); |
| 953 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 954 | ddev->saved_skb = pskb_copy(skb, GFP_KERNEL); |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 955 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 956 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
| 957 | data_exch); |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 958 | if (rc) { |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 959 | kfree_skb(skb); |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 960 | kfree_skb(ddev->saved_skb); |
| 961 | ddev->saved_skb = NULL; |
| 962 | } |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 963 | |
| 964 | return rc; |
| 965 | } |
| 966 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 967 | static int digital_tg_send_atn(struct nfc_digital_dev *ddev) |
| 968 | { |
| 969 | struct digital_dep_req_res *dep_res; |
| 970 | struct sk_buff *skb; |
| 971 | int rc; |
| 972 | |
| 973 | skb = digital_skb_alloc(ddev, 1); |
| 974 | if (!skb) |
| 975 | return -ENOMEM; |
| 976 | |
| 977 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
| 978 | |
| 979 | dep_res = (struct digital_dep_req_res *)skb->data; |
| 980 | |
| 981 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| 982 | dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| 983 | dep_res->pfb = DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU; |
| 984 | |
| 985 | if (ddev->did) { |
| 986 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| 987 | |
| 988 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, |
| 989 | sizeof(ddev->did)); |
| 990 | } |
| 991 | |
| 992 | digital_skb_push_dep_sod(ddev, skb); |
| 993 | |
| 994 | ddev->skb_add_crc(skb); |
| 995 | |
| 996 | rc = digital_tg_send_cmd(ddev, skb, 1500, digital_tg_recv_dep_req, |
| 997 | NULL); |
| 998 | if (rc) |
| 999 | kfree_skb(skb); |
| 1000 | |
| 1001 | return rc; |
| 1002 | } |
| 1003 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1004 | static int digital_tg_send_saved_skb(struct nfc_digital_dev *ddev) |
| 1005 | { |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 1006 | int rc; |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1007 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 1008 | if (!ddev->saved_skb) |
| 1009 | return -EINVAL; |
| 1010 | |
| 1011 | skb_get(ddev->saved_skb); |
| 1012 | |
| 1013 | rc = digital_tg_send_cmd(ddev, ddev->saved_skb, 1500, |
| 1014 | digital_tg_recv_dep_req, NULL); |
| 1015 | if (rc) |
| 1016 | kfree_skb(ddev->saved_skb); |
| 1017 | |
| 1018 | return rc; |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1019 | } |
| 1020 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1021 | static void digital_tg_recv_dep_req(struct nfc_digital_dev *ddev, void *arg, |
| 1022 | struct sk_buff *resp) |
| 1023 | { |
| 1024 | int rc; |
| 1025 | struct digital_dep_req_res *dep_req; |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 1026 | u8 pfb; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1027 | size_t size; |
| 1028 | |
| 1029 | if (IS_ERR(resp)) { |
| 1030 | rc = PTR_ERR(resp); |
| 1031 | resp = NULL; |
| 1032 | goto exit; |
| 1033 | } |
| 1034 | |
| 1035 | rc = ddev->skb_check_crc(resp); |
| 1036 | if (rc) { |
| 1037 | PROTOCOL_ERR("14.4.1.6"); |
| 1038 | goto exit; |
| 1039 | } |
| 1040 | |
| 1041 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 1042 | if (rc) { |
| 1043 | PROTOCOL_ERR("14.4.1.2"); |
| 1044 | goto exit; |
| 1045 | } |
| 1046 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1047 | if (resp->len > ddev->local_payload_max) { |
| 1048 | rc = -EMSGSIZE; |
| 1049 | goto exit; |
| 1050 | } |
| 1051 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1052 | size = sizeof(struct digital_dep_req_res); |
| 1053 | dep_req = (struct digital_dep_req_res *)resp->data; |
| 1054 | |
| 1055 | if (resp->len < size || dep_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
| 1056 | dep_req->cmd != DIGITAL_CMD_DEP_REQ) { |
| 1057 | rc = -EIO; |
| 1058 | goto exit; |
| 1059 | } |
| 1060 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 1061 | pfb = dep_req->pfb; |
| 1062 | |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 1063 | if (DIGITAL_NFC_DEP_DID_BIT_SET(pfb)) { |
| 1064 | if (ddev->did && (ddev->did == resp->data[3])) { |
| 1065 | size++; |
| 1066 | } else { |
| 1067 | rc = -EIO; |
| 1068 | goto exit; |
| 1069 | } |
| 1070 | } else if (ddev->did) { |
| 1071 | rc = -EIO; |
| 1072 | goto exit; |
| 1073 | } |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1074 | |
Mark A. Greer | 3e6b0de | 2014-09-23 16:38:06 -0700 | [diff] [blame] | 1075 | if (DIGITAL_NFC_DEP_NAD_BIT_SET(pfb)) { |
| 1076 | rc = -EIO; |
| 1077 | goto exit; |
| 1078 | } |
| 1079 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 1080 | if (size > resp->len) { |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1081 | rc = -EIO; |
| 1082 | goto exit; |
| 1083 | } |
| 1084 | |
Mark A. Greer | 6ce3066 | 2014-09-23 16:38:03 -0700 | [diff] [blame] | 1085 | skb_pull(resp, size); |
| 1086 | |
| 1087 | switch (DIGITAL_NFC_DEP_PFB_TYPE(pfb)) { |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1088 | case DIGITAL_NFC_DEP_PFB_I_PDU: |
Samuel Ortiz | 2604253 | 2013-09-20 16:56:40 +0200 | [diff] [blame] | 1089 | pr_debug("DIGITAL_NFC_DEP_PFB_I_PDU\n"); |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1090 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1091 | if ((ddev->atn_count && (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != |
| 1092 | ddev->curr_nfc_dep_pni)) || |
| 1093 | (DIGITAL_NFC_DEP_PFB_PNI(pfb) != ddev->curr_nfc_dep_pni)) { |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1094 | PROTOCOL_ERR("14.12.3.4"); |
| 1095 | rc = -EIO; |
| 1096 | goto exit; |
| 1097 | } |
| 1098 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1099 | if (ddev->atn_count) { |
| 1100 | ddev->atn_count = 0; |
| 1101 | |
| 1102 | rc = digital_tg_send_saved_skb(ddev); |
| 1103 | if (rc) |
| 1104 | goto exit; |
| 1105 | |
| 1106 | return; |
| 1107 | } |
| 1108 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1109 | kfree_skb(ddev->saved_skb); |
| 1110 | ddev->saved_skb = NULL; |
| 1111 | |
Mark A. Greer | c12715a | 2014-09-23 16:38:10 -0700 | [diff] [blame] | 1112 | resp = digital_recv_dep_data_gather(ddev, pfb, resp, |
| 1113 | digital_tg_send_ack, NULL); |
| 1114 | if (IS_ERR(resp)) { |
| 1115 | rc = PTR_ERR(resp); |
| 1116 | resp = NULL; |
| 1117 | goto exit; |
| 1118 | } |
| 1119 | |
| 1120 | /* If resp is NULL then we're still chaining so return and |
| 1121 | * wait for the next part of the PDU. Else, the PDU is |
| 1122 | * complete so pass it up. |
| 1123 | */ |
| 1124 | if (!resp) |
| 1125 | return; |
| 1126 | |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1127 | rc = 0; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1128 | break; |
| 1129 | case DIGITAL_NFC_DEP_PFB_ACK_NACK_PDU: |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1130 | if (!DIGITAL_NFC_DEP_NACK_BIT_SET(pfb)) { /* ACK */ |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1131 | if ((ddev->atn_count && |
| 1132 | (DIGITAL_NFC_DEP_PFB_PNI(pfb - 1) != |
| 1133 | ddev->curr_nfc_dep_pni)) || |
| 1134 | (DIGITAL_NFC_DEP_PFB_PNI(pfb) != |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1135 | ddev->curr_nfc_dep_pni) || |
| 1136 | !ddev->chaining_skb || !ddev->saved_skb) { |
| 1137 | rc = -EIO; |
| 1138 | goto exit; |
| 1139 | } |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1140 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1141 | if (ddev->atn_count) { |
| 1142 | ddev->atn_count = 0; |
| 1143 | |
| 1144 | rc = digital_tg_send_saved_skb(ddev); |
| 1145 | if (rc) |
| 1146 | goto exit; |
| 1147 | |
| 1148 | return; |
| 1149 | } |
| 1150 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1151 | kfree_skb(ddev->saved_skb); |
| 1152 | ddev->saved_skb = NULL; |
| 1153 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1154 | rc = digital_tg_send_dep_res(ddev, ddev->chaining_skb); |
| 1155 | if (rc) |
| 1156 | goto exit; |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1157 | } else { /* NACK */ |
| 1158 | if ((DIGITAL_NFC_DEP_PFB_PNI(pfb + 1) != |
| 1159 | ddev->curr_nfc_dep_pni) || |
| 1160 | !ddev->saved_skb) { |
| 1161 | rc = -EIO; |
| 1162 | goto exit; |
| 1163 | } |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1164 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1165 | ddev->atn_count = 0; |
| 1166 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1167 | rc = digital_tg_send_saved_skb(ddev); |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 1168 | if (rc) |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1169 | goto exit; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1170 | } |
| 1171 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1172 | return; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1173 | case DIGITAL_NFC_DEP_PFB_SUPERVISOR_PDU: |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1174 | if (DIGITAL_NFC_DEP_PFB_IS_TIMEOUT(pfb)) { |
| 1175 | rc = -EINVAL; |
| 1176 | goto exit; |
| 1177 | } |
| 1178 | |
| 1179 | rc = digital_tg_send_atn(ddev); |
| 1180 | if (rc) |
| 1181 | goto exit; |
| 1182 | |
| 1183 | ddev->atn_count++; |
| 1184 | |
| 1185 | kfree_skb(resp); |
| 1186 | return; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1187 | } |
| 1188 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1189 | rc = nfc_tm_data_received(ddev->nfc_dev, resp); |
| 1190 | |
| 1191 | exit: |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1192 | kfree_skb(ddev->chaining_skb); |
| 1193 | ddev->chaining_skb = NULL; |
| 1194 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1195 | ddev->atn_count = 0; |
| 1196 | |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1197 | kfree_skb(ddev->saved_skb); |
| 1198 | ddev->saved_skb = NULL; |
| 1199 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1200 | if (rc) |
| 1201 | kfree_skb(resp); |
| 1202 | } |
| 1203 | |
| 1204 | int digital_tg_send_dep_res(struct nfc_digital_dev *ddev, struct sk_buff *skb) |
| 1205 | { |
| 1206 | struct digital_dep_req_res *dep_res; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1207 | struct sk_buff *chaining_skb, *tmp_skb; |
| 1208 | int rc; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1209 | |
| 1210 | skb_push(skb, sizeof(struct digital_dep_req_res)); |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1211 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1212 | dep_res = (struct digital_dep_req_res *)skb->data; |
| 1213 | |
| 1214 | dep_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| 1215 | dep_res->cmd = DIGITAL_CMD_DEP_RES; |
| 1216 | dep_res->pfb = ddev->curr_nfc_dep_pni; |
| 1217 | |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 1218 | if (ddev->did) { |
| 1219 | dep_res->pfb |= DIGITAL_NFC_DEP_PFB_DID_BIT; |
| 1220 | |
| 1221 | memcpy(skb_put(skb, sizeof(ddev->did)), &ddev->did, |
| 1222 | sizeof(ddev->did)); |
| 1223 | } |
| 1224 | |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1225 | ddev->curr_nfc_dep_pni = |
| 1226 | DIGITAL_NFC_DEP_PFB_PNI(ddev->curr_nfc_dep_pni + 1); |
| 1227 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1228 | chaining_skb = ddev->chaining_skb; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1229 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1230 | tmp_skb = digital_send_dep_data_prep(ddev, skb, dep_res, NULL); |
| 1231 | if (IS_ERR(tmp_skb)) |
| 1232 | return PTR_ERR(tmp_skb); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1233 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1234 | digital_skb_push_dep_sod(ddev, tmp_skb); |
| 1235 | |
| 1236 | ddev->skb_add_crc(tmp_skb); |
| 1237 | |
Thierry Escande | 1d984c2 | 2016-07-08 15:52:39 +0200 | [diff] [blame^] | 1238 | ddev->saved_skb = pskb_copy(tmp_skb, GFP_KERNEL); |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1239 | |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1240 | rc = digital_tg_send_cmd(ddev, tmp_skb, 1500, digital_tg_recv_dep_req, |
| 1241 | NULL); |
| 1242 | if (rc) { |
| 1243 | if (tmp_skb != skb) |
| 1244 | kfree_skb(tmp_skb); |
| 1245 | |
| 1246 | kfree_skb(chaining_skb); |
| 1247 | ddev->chaining_skb = NULL; |
Mark A. Greer | 49dbb14 | 2014-09-23 16:38:12 -0700 | [diff] [blame] | 1248 | |
| 1249 | kfree_skb(ddev->saved_skb); |
| 1250 | ddev->saved_skb = NULL; |
Mark A. Greer | 3bd2a5b | 2014-09-23 16:38:09 -0700 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | return rc; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1254 | } |
| 1255 | |
| 1256 | static void digital_tg_send_psl_res_complete(struct nfc_digital_dev *ddev, |
| 1257 | void *arg, struct sk_buff *resp) |
| 1258 | { |
Thierry Escande | 67af1d7 | 2014-01-02 11:58:13 +0100 | [diff] [blame] | 1259 | u8 rf_tech = (unsigned long)arg; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1260 | |
| 1261 | if (IS_ERR(resp)) |
| 1262 | return; |
| 1263 | |
Thierry Escande | b711ad5 | 2014-01-06 23:34:48 +0100 | [diff] [blame] | 1264 | digital_tg_set_rf_tech(ddev, rf_tech); |
| 1265 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1266 | digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH, rf_tech); |
| 1267 | |
| 1268 | digital_tg_listen(ddev, 1500, digital_tg_recv_dep_req, NULL); |
| 1269 | |
| 1270 | dev_kfree_skb(resp); |
| 1271 | } |
| 1272 | |
| 1273 | static int digital_tg_send_psl_res(struct nfc_digital_dev *ddev, u8 did, |
| 1274 | u8 rf_tech) |
| 1275 | { |
| 1276 | struct digital_psl_res *psl_res; |
| 1277 | struct sk_buff *skb; |
| 1278 | int rc; |
| 1279 | |
| 1280 | skb = digital_skb_alloc(ddev, sizeof(struct digital_psl_res)); |
| 1281 | if (!skb) |
| 1282 | return -ENOMEM; |
| 1283 | |
| 1284 | skb_put(skb, sizeof(struct digital_psl_res)); |
| 1285 | |
| 1286 | psl_res = (struct digital_psl_res *)skb->data; |
| 1287 | |
| 1288 | psl_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| 1289 | psl_res->cmd = DIGITAL_CMD_PSL_RES; |
| 1290 | psl_res->did = did; |
| 1291 | |
| 1292 | digital_skb_push_dep_sod(ddev, skb); |
| 1293 | |
| 1294 | ddev->skb_add_crc(skb); |
| 1295 | |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1296 | ddev->curr_nfc_dep_pni = 0; |
| 1297 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1298 | rc = digital_tg_send_cmd(ddev, skb, 0, digital_tg_send_psl_res_complete, |
Thierry Escande | 67af1d7 | 2014-01-02 11:58:13 +0100 | [diff] [blame] | 1299 | (void *)(unsigned long)rf_tech); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1300 | if (rc) |
| 1301 | kfree_skb(skb); |
| 1302 | |
| 1303 | return rc; |
| 1304 | } |
| 1305 | |
| 1306 | static void digital_tg_recv_psl_req(struct nfc_digital_dev *ddev, void *arg, |
| 1307 | struct sk_buff *resp) |
| 1308 | { |
| 1309 | int rc; |
| 1310 | struct digital_psl_req *psl_req; |
| 1311 | u8 rf_tech; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1312 | u8 dsi, payload_size, payload_bits; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1313 | |
| 1314 | if (IS_ERR(resp)) { |
| 1315 | rc = PTR_ERR(resp); |
| 1316 | resp = NULL; |
| 1317 | goto exit; |
| 1318 | } |
| 1319 | |
| 1320 | rc = ddev->skb_check_crc(resp); |
| 1321 | if (rc) { |
| 1322 | PROTOCOL_ERR("14.4.1.6"); |
| 1323 | goto exit; |
| 1324 | } |
| 1325 | |
| 1326 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 1327 | if (rc) { |
| 1328 | PROTOCOL_ERR("14.4.1.2"); |
| 1329 | goto exit; |
| 1330 | } |
| 1331 | |
| 1332 | psl_req = (struct digital_psl_req *)resp->data; |
| 1333 | |
| 1334 | if (resp->len != sizeof(struct digital_psl_req) || |
| 1335 | psl_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
| 1336 | psl_req->cmd != DIGITAL_CMD_PSL_REQ) { |
| 1337 | rc = -EIO; |
| 1338 | goto exit; |
| 1339 | } |
| 1340 | |
| 1341 | dsi = (psl_req->brs >> 3) & 0x07; |
| 1342 | switch (dsi) { |
| 1343 | case 0: |
| 1344 | rf_tech = NFC_DIGITAL_RF_TECH_106A; |
| 1345 | break; |
| 1346 | case 1: |
| 1347 | rf_tech = NFC_DIGITAL_RF_TECH_212F; |
| 1348 | break; |
| 1349 | case 2: |
| 1350 | rf_tech = NFC_DIGITAL_RF_TECH_424F; |
| 1351 | break; |
| 1352 | default: |
Masanari Iida | 77d84ff | 2013-12-09 00:22:53 +0900 | [diff] [blame] | 1353 | pr_err("Unsupported dsi value %d\n", dsi); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1354 | goto exit; |
| 1355 | } |
| 1356 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1357 | payload_bits = DIGITAL_PAYLOAD_FSL_TO_BITS(psl_req->fsl); |
| 1358 | payload_size = digital_payload_bits_to_size(payload_bits); |
| 1359 | |
| 1360 | if (!payload_size || (payload_size > min(ddev->local_payload_max, |
| 1361 | ddev->remote_payload_max))) { |
| 1362 | rc = -EINVAL; |
| 1363 | goto exit; |
| 1364 | } |
| 1365 | |
| 1366 | ddev->local_payload_max = payload_size; |
| 1367 | ddev->remote_payload_max = payload_size; |
| 1368 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1369 | rc = digital_tg_send_psl_res(ddev, psl_req->did, rf_tech); |
| 1370 | |
| 1371 | exit: |
| 1372 | kfree_skb(resp); |
| 1373 | } |
| 1374 | |
| 1375 | static void digital_tg_send_atr_res_complete(struct nfc_digital_dev *ddev, |
| 1376 | void *arg, struct sk_buff *resp) |
| 1377 | { |
| 1378 | int offset; |
| 1379 | |
| 1380 | if (IS_ERR(resp)) { |
| 1381 | digital_poll_next_tech(ddev); |
| 1382 | return; |
| 1383 | } |
| 1384 | |
| 1385 | offset = 2; |
| 1386 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) |
| 1387 | offset++; |
| 1388 | |
Mark A. Greer | 9b5ec0f | 2014-09-23 16:38:14 -0700 | [diff] [blame] | 1389 | ddev->atn_count = 0; |
| 1390 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1391 | if (resp->data[offset] == DIGITAL_CMD_PSL_REQ) |
| 1392 | digital_tg_recv_psl_req(ddev, arg, resp); |
| 1393 | else |
| 1394 | digital_tg_recv_dep_req(ddev, arg, resp); |
| 1395 | } |
| 1396 | |
| 1397 | static int digital_tg_send_atr_res(struct nfc_digital_dev *ddev, |
| 1398 | struct digital_atr_req *atr_req) |
| 1399 | { |
| 1400 | struct digital_atr_res *atr_res; |
| 1401 | struct sk_buff *skb; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1402 | u8 *gb, payload_bits; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1403 | size_t gb_len; |
| 1404 | int rc; |
| 1405 | |
| 1406 | gb = nfc_get_local_general_bytes(ddev->nfc_dev, &gb_len); |
| 1407 | if (!gb) |
| 1408 | gb_len = 0; |
| 1409 | |
| 1410 | skb = digital_skb_alloc(ddev, sizeof(struct digital_atr_res) + gb_len); |
| 1411 | if (!skb) |
| 1412 | return -ENOMEM; |
| 1413 | |
| 1414 | skb_put(skb, sizeof(struct digital_atr_res)); |
| 1415 | atr_res = (struct digital_atr_res *)skb->data; |
| 1416 | |
| 1417 | memset(atr_res, 0, sizeof(struct digital_atr_res)); |
| 1418 | |
| 1419 | atr_res->dir = DIGITAL_NFC_DEP_FRAME_DIR_IN; |
| 1420 | atr_res->cmd = DIGITAL_CMD_ATR_RES; |
| 1421 | memcpy(atr_res->nfcid3, atr_req->nfcid3, sizeof(atr_req->nfcid3)); |
| 1422 | atr_res->to = 8; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1423 | |
| 1424 | ddev->local_payload_max = DIGITAL_PAYLOAD_SIZE_MAX; |
| 1425 | payload_bits = digital_payload_size_to_bits(ddev->local_payload_max); |
| 1426 | atr_res->pp = DIGITAL_PAYLOAD_BITS_TO_PP(payload_bits); |
| 1427 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1428 | if (gb_len) { |
| 1429 | skb_put(skb, gb_len); |
| 1430 | |
| 1431 | atr_res->pp |= DIGITAL_GB_BIT; |
| 1432 | memcpy(atr_res->gb, gb, gb_len); |
| 1433 | } |
| 1434 | |
| 1435 | digital_skb_push_dep_sod(ddev, skb); |
| 1436 | |
| 1437 | ddev->skb_add_crc(skb); |
| 1438 | |
Mark A. Greer | 485fdc9 | 2014-09-23 16:38:07 -0700 | [diff] [blame] | 1439 | ddev->curr_nfc_dep_pni = 0; |
| 1440 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1441 | rc = digital_tg_send_cmd(ddev, skb, 999, |
| 1442 | digital_tg_send_atr_res_complete, NULL); |
Mark A. Greer | b15829b | 2014-09-23 16:38:02 -0700 | [diff] [blame] | 1443 | if (rc) |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1444 | kfree_skb(skb); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1445 | |
| 1446 | return rc; |
| 1447 | } |
| 1448 | |
| 1449 | void digital_tg_recv_atr_req(struct nfc_digital_dev *ddev, void *arg, |
| 1450 | struct sk_buff *resp) |
| 1451 | { |
| 1452 | int rc; |
| 1453 | struct digital_atr_req *atr_req; |
| 1454 | size_t gb_len, min_size; |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1455 | u8 poll_tech_count, payload_bits; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1456 | |
| 1457 | if (IS_ERR(resp)) { |
| 1458 | rc = PTR_ERR(resp); |
| 1459 | resp = NULL; |
| 1460 | goto exit; |
| 1461 | } |
| 1462 | |
| 1463 | if (!resp->len) { |
| 1464 | rc = -EIO; |
| 1465 | goto exit; |
| 1466 | } |
| 1467 | |
| 1468 | if (resp->data[0] == DIGITAL_NFC_DEP_NFCA_SOD_SB) { |
| 1469 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 2; |
Thierry Escande | b711ad5 | 2014-01-06 23:34:48 +0100 | [diff] [blame] | 1470 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_106A); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1471 | } else { |
| 1472 | min_size = DIGITAL_ATR_REQ_MIN_SIZE + 1; |
Thierry Escande | b711ad5 | 2014-01-06 23:34:48 +0100 | [diff] [blame] | 1473 | digital_tg_set_rf_tech(ddev, NFC_DIGITAL_RF_TECH_212F); |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | if (resp->len < min_size) { |
| 1477 | rc = -EIO; |
| 1478 | goto exit; |
| 1479 | } |
| 1480 | |
Thierry Escande | 48e1044 | 2014-01-06 23:34:37 +0100 | [diff] [blame] | 1481 | ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1482 | |
| 1483 | rc = ddev->skb_check_crc(resp); |
| 1484 | if (rc) { |
| 1485 | PROTOCOL_ERR("14.4.1.6"); |
| 1486 | goto exit; |
| 1487 | } |
| 1488 | |
| 1489 | rc = digital_skb_pull_dep_sod(ddev, resp); |
| 1490 | if (rc) { |
| 1491 | PROTOCOL_ERR("14.4.1.2"); |
| 1492 | goto exit; |
| 1493 | } |
| 1494 | |
| 1495 | atr_req = (struct digital_atr_req *)resp->data; |
| 1496 | |
| 1497 | if (atr_req->dir != DIGITAL_NFC_DEP_FRAME_DIR_OUT || |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 1498 | atr_req->cmd != DIGITAL_CMD_ATR_REQ || |
| 1499 | atr_req->did > DIGITAL_DID_MAX) { |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1500 | rc = -EINVAL; |
| 1501 | goto exit; |
| 1502 | } |
| 1503 | |
Mark A. Greer | b08147c | 2014-09-23 16:38:08 -0700 | [diff] [blame] | 1504 | payload_bits = DIGITAL_PAYLOAD_PP_TO_BITS(atr_req->pp); |
| 1505 | ddev->remote_payload_max = digital_payload_bits_to_size(payload_bits); |
| 1506 | |
| 1507 | if (!ddev->remote_payload_max) { |
| 1508 | rc = -EINVAL; |
| 1509 | goto exit; |
| 1510 | } |
| 1511 | |
Mark A. Greer | 05afedc | 2014-09-23 16:38:05 -0700 | [diff] [blame] | 1512 | ddev->did = atr_req->did; |
| 1513 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1514 | rc = digital_tg_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, |
| 1515 | NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED); |
| 1516 | if (rc) |
| 1517 | goto exit; |
| 1518 | |
| 1519 | rc = digital_tg_send_atr_res(ddev, atr_req); |
| 1520 | if (rc) |
| 1521 | goto exit; |
| 1522 | |
| 1523 | gb_len = resp->len - sizeof(struct digital_atr_req); |
Mark A. Greer | 0529a7a | 2014-07-02 09:03:49 -0700 | [diff] [blame] | 1524 | |
| 1525 | poll_tech_count = ddev->poll_tech_count; |
| 1526 | ddev->poll_tech_count = 0; |
| 1527 | |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1528 | rc = nfc_tm_activated(ddev->nfc_dev, NFC_PROTO_NFC_DEP_MASK, |
| 1529 | NFC_COMM_PASSIVE, atr_req->gb, gb_len); |
Mark A. Greer | 0529a7a | 2014-07-02 09:03:49 -0700 | [diff] [blame] | 1530 | if (rc) { |
| 1531 | ddev->poll_tech_count = poll_tech_count; |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1532 | goto exit; |
Mark A. Greer | 0529a7a | 2014-07-02 09:03:49 -0700 | [diff] [blame] | 1533 | } |
Thierry Escande | 1c7a4c2 | 2013-09-19 17:55:30 +0200 | [diff] [blame] | 1534 | |
| 1535 | rc = 0; |
| 1536 | exit: |
| 1537 | if (rc) |
| 1538 | digital_poll_next_tech(ddev); |
| 1539 | |
| 1540 | dev_kfree_skb(resp); |
| 1541 | } |