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