drivers/nfc/nfcwilink.c

   1 /*
   2  *  Texas Instrument's NFC Driver For Shared Transport.
   3  *
   4  *  NFC Driver acts as interface between NCI core and
   5  *  TI Shared Transport Layer.
   6  *
   7  *  Copyright (C) 2011 Texas Instruments, Inc.
   8  *
   9  *  Written by Ilan Elias <ilane@ti.com>
  10  *
  11  *  Acknowledgements:
  12  *  This file is based on btwilink.c, which was written
  13  *  by Raja Mani and Pavan Savoy.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License version 2 as
  17  *  published by the Free Software Foundation.
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this program; if not, write to the Free Software
  26  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  *
  28  */
  29 #include <linux/platform_device.h>
  30 #include <linux/module.h>
  31 #include <linux/types.h>
  32 #include <linux/firmware.h>
  33 #include <linux/nfc.h>
  34 #include <net/nfc/nci.h>
  35 #include <net/nfc/nci_core.h>
  36 #include <linux/ti_wilink_st.h>
  37
  38 #define NFCWILINK_CHNL                  12
  39 #define NFCWILINK_OPCODE                7
  40 #define NFCWILINK_MAX_FRAME_SIZE        300
  41 #define NFCWILINK_HDR_LEN               4
  42 #define NFCWILINK_OFFSET_LEN_IN_HDR     1
  43 #define NFCWILINK_LEN_SIZE              2
  44 #define NFCWILINK_REGISTER_TIMEOUT      8000    /* 8 sec */
  45 #define NFCWILINK_CMD_TIMEOUT           5000    /* 5 sec */
  46
  47 #define BTS_FILE_NAME_MAX_SIZE          40
  48 #define BTS_FILE_HDR_MAGIC              0x42535442
  49 #define BTS_FILE_CMD_MAX_LEN            0xff
  50 #define BTS_FILE_ACTION_TYPE_SEND_CMD   1
  51
  52 #define NCI_VS_NFCC_INFO_CMD_GID        0x2f
  53 #define NCI_VS_NFCC_INFO_CMD_OID        0x12
  54 #define NCI_VS_NFCC_INFO_RSP_GID        0x4f
  55 #define NCI_VS_NFCC_INFO_RSP_OID        0x12
  56
  57 struct nfcwilink_hdr {
  58         __u8 chnl;
  59         __u8 opcode;
  60         __le16 len;
  61 } __packed;
  62
  63 struct nci_vs_nfcc_info_cmd {
  64         __u8 gid;
  65         __u8 oid;
  66         __u8 plen;
  67 } __packed;
  68
  69 struct nci_vs_nfcc_info_rsp {
  70         __u8 gid;
  71         __u8 oid;
  72         __u8 plen;
  73         __u8 status;
  74         __u8 hw_id;
  75         __u8 sw_ver_x;
  76         __u8 sw_ver_z;
  77         __u8 patch_id;
  78 } __packed;
  79
  80 struct bts_file_hdr {
  81         __le32 magic;
  82         __le32 ver;
  83         __u8 rfu[24];
  84         __u8 actions[0];
  85 } __packed;
  86
  87 struct bts_file_action {
  88         __le16 type;
  89         __le16 len;
  90         __u8 data[0];
  91 } __packed;
  92
  93 struct nfcwilink {
  94         struct platform_device          *pdev;
  95         struct nci_dev                  *ndev;
  96         unsigned long                   flags;
  97
  98         char                            st_register_cb_status;
  99         long                            (*st_write) (struct sk_buff *);
 100
 101         struct completion               completed;
 102
 103         struct nci_vs_nfcc_info_rsp     nfcc_info;
 104 };
 105
 106 /* NFCWILINK driver flags */
 107 enum {
 108         NFCWILINK_RUNNING,
 109         NFCWILINK_FW_DOWNLOAD,
 110 };
 111
 112 static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb);
 113
 114 static inline struct sk_buff *nfcwilink_skb_alloc(unsigned int len, gfp_t how)
 115 {
 116         struct sk_buff *skb;
 117
 118         skb = alloc_skb(len + NFCWILINK_HDR_LEN, how);
 119         if (skb)
 120                 skb_reserve(skb, NFCWILINK_HDR_LEN);
 121
 122         return skb;
 123 }
 124
 125 static void nfcwilink_fw_download_receive(struct nfcwilink *drv,
 126                                                 struct sk_buff *skb)
 127 {
 128         struct nci_vs_nfcc_info_rsp *rsp = (void *)skb->data;
 129
 130         /* Detect NCI_VS_NFCC_INFO_RSP and store the result */
 131         if ((skb->len > 3) && (rsp->gid == NCI_VS_NFCC_INFO_RSP_GID) &&
 132                 (rsp->oid == NCI_VS_NFCC_INFO_RSP_OID)) {
 133                 memcpy(&drv->nfcc_info, rsp,
 134                         sizeof(struct nci_vs_nfcc_info_rsp));
 135         }
 136
 137         kfree_skb(skb);
 138
 139         complete(&drv->completed);
 140 }
 141
 142 static int nfcwilink_get_bts_file_name(struct nfcwilink *drv, char *file_name)
 143 {
 144         struct nci_vs_nfcc_info_cmd *cmd;
 145         struct sk_buff *skb;
 146         unsigned long comp_ret;
 147         int rc;
 148
 149         nfc_dev_dbg(&drv->pdev->dev, "get_bts_file_name entry");
 150
 151         skb = nfcwilink_skb_alloc(sizeof(struct nci_vs_nfcc_info_cmd),
 152                                         GFP_KERNEL);
 153         if (!skb) {
 154                 nfc_dev_err(&drv->pdev->dev,
 155                                 "no memory for nci_vs_nfcc_info_cmd");
 156                 return -ENOMEM;
 157         }
 158
 159         cmd = (struct nci_vs_nfcc_info_cmd *)
 160                         skb_put(skb, sizeof(struct nci_vs_nfcc_info_cmd));
 161         cmd->gid = NCI_VS_NFCC_INFO_CMD_GID;
 162         cmd->oid = NCI_VS_NFCC_INFO_CMD_OID;
 163         cmd->plen = 0;
 164
 165         drv->nfcc_info.plen = 0;
 166
 167         rc = nfcwilink_send(drv->ndev, skb);
 168         if (rc)
 169                 return rc;
 170
 171         comp_ret = wait_for_completion_timeout(&drv->completed,
 172                                 msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
 173         nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
 174                         comp_ret);
 175         if (comp_ret == 0) {
 176                 nfc_dev_err(&drv->pdev->dev,
 177                                 "timeout on wait_for_completion_timeout");
 178                 return -ETIMEDOUT;
 179         }
 180
 181         nfc_dev_dbg(&drv->pdev->dev, "nci_vs_nfcc_info_rsp: plen %d, status %d",
 182                         drv->nfcc_info.plen,
 183                         drv->nfcc_info.status);
 184
 185         if ((drv->nfcc_info.plen != 5) || (drv->nfcc_info.status != 0)) {
 186                 nfc_dev_err(&drv->pdev->dev,
 187                                 "invalid nci_vs_nfcc_info_rsp");
 188                 return -EINVAL;
 189         }
 190
 191         snprintf(file_name, BTS_FILE_NAME_MAX_SIZE,
 192                         "TINfcInit_%d.%d.%d.%d.bts",
 193                         drv->nfcc_info.hw_id,
 194                         drv->nfcc_info.sw_ver_x,
 195                         drv->nfcc_info.sw_ver_z,
 196                         drv->nfcc_info.patch_id);
 197
 198         nfc_dev_info(&drv->pdev->dev, "nfcwilink FW file name: %s", file_name);
 199
 200         return 0;
 201 }
 202
 203 static int nfcwilink_send_bts_cmd(struct nfcwilink *drv, __u8 *data, int len)
 204 {
 205         struct nfcwilink_hdr *hdr = (struct nfcwilink_hdr *)data;
 206         struct sk_buff *skb;
 207         unsigned long comp_ret;
 208         int rc;
 209
 210         nfc_dev_dbg(&drv->pdev->dev, "send_bts_cmd entry");
 211
 212         /* verify valid cmd for the NFC channel */
 213         if ((len <= sizeof(struct nfcwilink_hdr)) ||
 214                 (len > BTS_FILE_CMD_MAX_LEN) ||
 215                 (hdr->chnl != NFCWILINK_CHNL) ||
 216                 (hdr->opcode != NFCWILINK_OPCODE)) {
 217                 nfc_dev_err(&drv->pdev->dev,
 218                         "ignoring invalid bts cmd, len %d, chnl %d, opcode %d",
 219                         len, hdr->chnl, hdr->opcode);
 220                 return 0;
 221         }
 222
 223         /* remove the ST header */
 224         len -= sizeof(struct nfcwilink_hdr);
 225         data += sizeof(struct nfcwilink_hdr);
 226
 227         skb = nfcwilink_skb_alloc(len, GFP_KERNEL);
 228         if (!skb) {
 229                 nfc_dev_err(&drv->pdev->dev, "no memory for bts cmd");
 230                 return -ENOMEM;
 231         }
 232
 233         memcpy(skb_put(skb, len), data, len);
 234
 235         rc = nfcwilink_send(drv->ndev, skb);
 236         if (rc)
 237                 return rc;
 238
 239         comp_ret = wait_for_completion_timeout(&drv->completed,
 240                                 msecs_to_jiffies(NFCWILINK_CMD_TIMEOUT));
 241         nfc_dev_dbg(&drv->pdev->dev, "wait_for_completion_timeout returned %ld",
 242                         comp_ret);
 243         if (comp_ret == 0) {
 244                 nfc_dev_err(&drv->pdev->dev,
 245                                 "timeout on wait_for_completion_timeout");
 246                 return -ETIMEDOUT;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int nfcwilink_download_fw(struct nfcwilink *drv)
 253 {
 254         unsigned char file_name[BTS_FILE_NAME_MAX_SIZE];
 255         const struct firmware *fw;
 256         __u16 action_type, action_len;
 257         __u8 *ptr;
 258         int len, rc;
 259
 260         nfc_dev_dbg(&drv->pdev->dev, "download_fw entry");
 261
 262         set_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
 263
 264         rc = nfcwilink_get_bts_file_name(drv, file_name);
 265         if (rc)
 266                 goto exit;
 267
 268         rc = request_firmware(&fw, file_name, &drv->pdev->dev);
 269         if (rc) {
 270                 nfc_dev_err(&drv->pdev->dev, "request_firmware failed %d", rc);
 271
 272                 /* if the file is not found, don't exit with failure */
 273                 if (rc == -ENOENT)
 274                         rc = 0;
 275
 276                 goto exit;
 277         }
 278
 279         len = fw->size;
 280         ptr = (__u8 *)fw->data;
 281
 282         if ((len == 0) || (ptr == NULL)) {
 283                 nfc_dev_dbg(&drv->pdev->dev,
 284                                 "request_firmware returned size %d", len);
 285                 goto release_fw;
 286         }
 287
 288         if (__le32_to_cpu(((struct bts_file_hdr *)ptr)->magic) !=
 289                         BTS_FILE_HDR_MAGIC) {
 290                 nfc_dev_err(&drv->pdev->dev, "wrong bts magic number");
 291                 rc = -EINVAL;
 292                 goto release_fw;
 293         }
 294
 295         /* remove the BTS header */
 296         len -= sizeof(struct bts_file_hdr);
 297         ptr += sizeof(struct bts_file_hdr);
 298
 299         while (len > 0) {
 300                 action_type =
 301                         __le16_to_cpu(((struct bts_file_action *)ptr)->type);
 302                 action_len =
 303                         __le16_to_cpu(((struct bts_file_action *)ptr)->len);
 304
 305                 nfc_dev_dbg(&drv->pdev->dev, "bts_file_action type %d, len %d",
 306                                 action_type, action_len);
 307
 308                 switch (action_type) {
 309                 case BTS_FILE_ACTION_TYPE_SEND_CMD:
 310                         rc = nfcwilink_send_bts_cmd(drv,
 311                                         ((struct bts_file_action *)ptr)->data,
 312                                         action_len);
 313                         if (rc)
 314                                 goto release_fw;
 315                         break;
 316                 }
 317
 318                 /* advance to the next action */
 319                 len -= (sizeof(struct bts_file_action) + action_len);
 320                 ptr += (sizeof(struct bts_file_action) + action_len);
 321         }
 322
 323 release_fw:
 324         release_firmware(fw);
 325
 326 exit:
 327         clear_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags);
 328         return rc;
 329 }
 330
 331 /* Called by ST when registration is complete */
 332 static void nfcwilink_register_complete(void *priv_data, char data)
 333 {
 334         struct nfcwilink *drv = priv_data;
 335
 336         nfc_dev_dbg(&drv->pdev->dev, "register_complete entry");
 337
 338         /* store ST registration status */
 339         drv->st_register_cb_status = data;
 340
 341         /* complete the wait in nfc_st_open() */
 342         complete(&drv->completed);
 343 }
 344
 345 /* Called by ST when receive data is available */
 346 static long nfcwilink_receive(void *priv_data, struct sk_buff *skb)
 347 {
 348         struct nfcwilink *drv = priv_data;
 349         int rc;
 350
 351         if (!skb)
 352                 return -EFAULT;
 353
 354         if (!drv) {
 355                 kfree_skb(skb);
 356                 return -EFAULT;
 357         }
 358
 359         nfc_dev_dbg(&drv->pdev->dev, "receive entry, len %d", skb->len);
 360
 361         /* strip the ST header
 362         (apart for the chnl byte, which is not received in the hdr) */
 363         skb_pull(skb, (NFCWILINK_HDR_LEN-1));
 364
 365         if (test_bit(NFCWILINK_FW_DOWNLOAD, &drv->flags)) {
 366                 nfcwilink_fw_download_receive(drv, skb);
 367                 return 0;
 368         }
 369
 370         /* Forward skb to NCI core layer */
 371         rc = nci_recv_frame(drv->ndev, skb);
 372         if (rc < 0) {
 373                 nfc_dev_err(&drv->pdev->dev, "nci_recv_frame failed %d", rc);
 374                 return rc;
 375         }
 376
 377         return 0;
 378 }
 379
 380 /* protocol structure registered with ST */
 381 static struct st_proto_s nfcwilink_proto = {
 382         .chnl_id = NFCWILINK_CHNL,
 383         .max_frame_size = NFCWILINK_MAX_FRAME_SIZE,
 384         .hdr_len = (NFCWILINK_HDR_LEN-1),       /* not including chnl byte */
 385         .offset_len_in_hdr = NFCWILINK_OFFSET_LEN_IN_HDR,
 386         .len_size = NFCWILINK_LEN_SIZE,
 387         .reserve = 0,
 388         .recv = nfcwilink_receive,
 389         .reg_complete_cb = nfcwilink_register_complete,
 390         .write = NULL,
 391 };
 392
 393 static int nfcwilink_open(struct nci_dev *ndev)
 394 {
 395         struct nfcwilink *drv = nci_get_drvdata(ndev);
 396         unsigned long comp_ret;
 397         int rc;
 398
 399         nfc_dev_dbg(&drv->pdev->dev, "open entry");
 400
 401         if (test_and_set_bit(NFCWILINK_RUNNING, &drv->flags)) {
 402                 rc = -EBUSY;
 403                 goto exit;
 404         }
 405
 406         nfcwilink_proto.priv_data = drv;
 407
 408         init_completion(&drv->completed);
 409         drv->st_register_cb_status = -EINPROGRESS;
 410
 411         rc = st_register(&nfcwilink_proto);
 412         if (rc < 0) {
 413                 if (rc == -EINPROGRESS) {
 414                         comp_ret = wait_for_completion_timeout(
 415                         &drv->completed,
 416                         msecs_to_jiffies(NFCWILINK_REGISTER_TIMEOUT));
 417
 418                         nfc_dev_dbg(&drv->pdev->dev,
 419                         "wait_for_completion_timeout returned %ld",
 420                         comp_ret);
 421
 422                         if (comp_ret == 0) {
 423                                 /* timeout */
 424                                 rc = -ETIMEDOUT;
 425                                 goto clear_exit;
 426                         } else if (drv->st_register_cb_status != 0) {
 427                                 rc = drv->st_register_cb_status;
 428                                 nfc_dev_err(&drv->pdev->dev,
 429                                 "st_register_cb failed %d", rc);
 430                                 goto clear_exit;
 431                         }
 432                 } else {
 433                         nfc_dev_err(&drv->pdev->dev,
 434                                 "st_register failed %d", rc);
 435                         goto clear_exit;
 436                 }
 437         }
 438
 439         /* st_register MUST fill the write callback */
 440         BUG_ON(nfcwilink_proto.write == NULL);
 441         drv->st_write = nfcwilink_proto.write;
 442
 443         if (nfcwilink_download_fw(drv)) {
 444                 nfc_dev_err(&drv->pdev->dev, "nfcwilink_download_fw failed %d",
 445                                 rc);
 446                 /* open should succeed, even if the FW download failed */
 447         }
 448
 449         goto exit;
 450
 451 clear_exit:
 452         clear_bit(NFCWILINK_RUNNING, &drv->flags);
 453
 454 exit:
 455         return rc;
 456 }
 457
 458 static int nfcwilink_close(struct nci_dev *ndev)
 459 {
 460         struct nfcwilink *drv = nci_get_drvdata(ndev);
 461         int rc;
 462
 463         nfc_dev_dbg(&drv->pdev->dev, "close entry");
 464
 465         if (!test_and_clear_bit(NFCWILINK_RUNNING, &drv->flags))
 466                 return 0;
 467
 468         rc = st_unregister(&nfcwilink_proto);
 469         if (rc)
 470                 nfc_dev_err(&drv->pdev->dev, "st_unregister failed %d", rc);
 471
 472         drv->st_write = NULL;
 473
 474         return rc;
 475 }
 476
 477 static int nfcwilink_send(struct nci_dev *ndev, struct sk_buff *skb)
 478 {
 479         struct nfcwilink *drv = nci_get_drvdata(ndev);
 480         struct nfcwilink_hdr hdr = {NFCWILINK_CHNL, NFCWILINK_OPCODE, 0x0000};
 481         long len;
 482
 483         nfc_dev_dbg(&drv->pdev->dev, "send entry, len %d", skb->len);
 484
 485         if (!test_bit(NFCWILINK_RUNNING, &drv->flags)) {
 486                 kfree_skb(skb);
 487                 return -EINVAL;
 488         }
 489
 490         /* add the ST hdr to the start of the buffer */
 491         hdr.len = cpu_to_le16(skb->len);
 492         memcpy(skb_push(skb, NFCWILINK_HDR_LEN), &hdr, NFCWILINK_HDR_LEN);
 493
 494         /* Insert skb to shared transport layer's transmit queue.
 495          * Freeing skb memory is taken care in shared transport layer,
 496          * so don't free skb memory here.
 497          */
 498         len = drv->st_write(skb);
 499         if (len < 0) {
 500                 kfree_skb(skb);
 501                 nfc_dev_err(&drv->pdev->dev, "st_write failed %ld", len);
 502                 return -EFAULT;
 503         }
 504
 505         return 0;
 506 }
 507
 508 static struct nci_ops nfcwilink_ops = {
 509         .open = nfcwilink_open,
 510         .close = nfcwilink_close,
 511         .send = nfcwilink_send,
 512 };
 513
 514 static int nfcwilink_probe(struct platform_device *pdev)
 515 {
 516         static struct nfcwilink *drv;
 517         int rc;
 518         __u32 protocols;
 519
 520         nfc_dev_dbg(&pdev->dev, "probe entry");
 521
 522         drv = devm_kzalloc(&pdev->dev, sizeof(struct nfcwilink), GFP_KERNEL);
 523         if (!drv) {
 524                 rc = -ENOMEM;
 525                 goto exit;
 526         }
 527
 528         drv->pdev = pdev;
 529
 530         protocols = NFC_PROTO_JEWEL_MASK
 531                 | NFC_PROTO_MIFARE_MASK | NFC_PROTO_FELICA_MASK
 532                 | NFC_PROTO_ISO14443_MASK
 533                 | NFC_PROTO_ISO14443_B_MASK
 534                 | NFC_PROTO_NFC_DEP_MASK;
 535
 536         drv->ndev = nci_allocate_device(&nfcwilink_ops,
 537                                         protocols,
 538                                         NFCWILINK_HDR_LEN,
 539                                         0);
 540         if (!drv->ndev) {
 541                 nfc_dev_err(&pdev->dev, "nci_allocate_device failed");
 542                 rc = -ENOMEM;
 543                 goto exit;
 544         }
 545
 546         nci_set_parent_dev(drv->ndev, &pdev->dev);
 547         nci_set_drvdata(drv->ndev, drv);
 548
 549         rc = nci_register_device(drv->ndev);
 550         if (rc < 0) {
 551                 nfc_dev_err(&pdev->dev, "nci_register_device failed %d", rc);
 552                 goto free_dev_exit;
 553         }
 554
 555         dev_set_drvdata(&pdev->dev, drv);
 556
 557         goto exit;
 558
 559 free_dev_exit:
 560         nci_free_device(drv->ndev);
 561
 562 exit:
 563         return rc;
 564 }
 565
 566 static int nfcwilink_remove(struct platform_device *pdev)
 567 {
 568         struct nfcwilink *drv = dev_get_drvdata(&pdev->dev);
 569         struct nci_dev *ndev;
 570
 571         nfc_dev_dbg(&pdev->dev, "remove entry");
 572
 573         if (!drv)
 574                 return -EFAULT;
 575
 576         ndev = drv->ndev;
 577
 578         nci_unregister_device(ndev);
 579         nci_free_device(ndev);
 580
 581         dev_set_drvdata(&pdev->dev, NULL);
 582
 583         return 0;
 584 }
 585
 586 static struct platform_driver nfcwilink_driver = {
 587         .probe = nfcwilink_probe,
 588         .remove = nfcwilink_remove,
 589         .driver = {
 590                 .name = "nfcwilink",
 591                 .owner = THIS_MODULE,
 592         },
 593 };
 594
 595 module_platform_driver(nfcwilink_driver);
 596
 597 /* ------ Module Info ------ */
 598
 599 MODULE_AUTHOR("Ilan Elias <ilane@ti.com>");
 600 MODULE_DESCRIPTION("NFC Driver for TI Shared Transport");
 601 MODULE_LICENSE("GPL");