drivers/nfc/pn544_hci.c

   1 /*
   2  * HCI based Driver for NXP PN544 NFC Chip
   3  *
   4  * Copyright (C) 2012  Intel Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the
  17  * Free Software Foundation, Inc.,
  18  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <linux/crc-ccitt.h>
  22 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/slab.h>
  25 #include <linux/miscdevice.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/gpio.h>
  28 #include <linux/i2c.h>
  29
  30 #include <linux/nfc.h>
  31 #include <net/nfc/hci.h>
  32 #include <net/nfc/shdlc.h>
  33
  34 #include <linux/nfc/pn544.h>
  35
  36 #define DRIVER_DESC "HCI NFC driver for PN544"
  37
  38 #define PN544_HCI_DRIVER_NAME "pn544_hci"
  39
  40 /* Timing restrictions (ms) */
  41 #define PN544_HCI_RESETVEN_TIME         30
  42
  43 static struct i2c_device_id pn544_hci_id_table[] = {
  44         {"pn544", 0},
  45         {}
  46 };
  47
  48 MODULE_DEVICE_TABLE(i2c, pn544_hci_id_table);
  49
  50 #define HCI_MODE 0
  51 #define FW_MODE 1
  52
  53 /* framing in HCI mode */
  54 #define PN544_HCI_LLC_LEN               1
  55 #define PN544_HCI_LLC_CRC               2
  56 #define PN544_HCI_LLC_LEN_CRC           (PN544_HCI_LLC_LEN + PN544_HCI_LLC_CRC)
  57 #define PN544_HCI_LLC_MIN_SIZE          (1 + PN544_HCI_LLC_LEN_CRC)
  58 #define PN544_HCI_LLC_MAX_PAYLOAD       29
  59 #define PN544_HCI_LLC_MAX_SIZE          (PN544_HCI_LLC_LEN_CRC + 1 + \
  60                                          PN544_HCI_LLC_MAX_PAYLOAD)
  61
  62 enum pn544_state {
  63         PN544_ST_COLD,
  64         PN544_ST_FW_READY,
  65         PN544_ST_READY,
  66 };
  67
  68 #define FULL_VERSION_LEN 11
  69
  70 /* Proprietary commands */
  71 #define PN544_WRITE             0x3f
  72
  73 /* Proprietary gates, events, commands and registers */
  74
  75 /* NFC_HCI_RF_READER_A_GATE additional registers and commands */
  76 #define PN544_RF_READER_A_AUTO_ACTIVATION                       0x10
  77 #define PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION               0x12
  78 #define PN544_MIFARE_CMD                                        0x21
  79
  80 /* Commands that apply to all RF readers */
  81 #define PN544_RF_READER_CMD_PRESENCE_CHECK      0x30
  82 #define PN544_RF_READER_CMD_ACTIVATE_NEXT       0x32
  83
  84 /* NFC_HCI_ID_MGMT_GATE additional registers */
  85 #define PN544_ID_MGMT_FULL_VERSION_SW           0x10
  86
  87 #define PN544_RF_READER_ISO15693_GATE           0x12
  88
  89 #define PN544_RF_READER_F_GATE                  0x14
  90 #define PN544_FELICA_ID                         0x04
  91 #define PN544_FELICA_RAW                        0x20
  92
  93 #define PN544_RF_READER_JEWEL_GATE              0x15
  94 #define PN544_JEWEL_RAW_CMD                     0x23
  95
  96 #define PN544_RF_READER_NFCIP1_INITIATOR_GATE   0x30
  97 #define PN544_RF_READER_NFCIP1_TARGET_GATE      0x31
  98
  99 #define PN544_SYS_MGMT_GATE                     0x90
 100 #define PN544_SYS_MGMT_INFO_NOTIFICATION        0x02
 101
 102 #define PN544_POLLING_LOOP_MGMT_GATE            0x94
 103 #define PN544_PL_RDPHASES                       0x06
 104 #define PN544_PL_EMULATION                      0x07
 105 #define PN544_PL_NFCT_DEACTIVATED               0x09
 106
 107 #define PN544_SWP_MGMT_GATE                     0xA0
 108
 109 #define PN544_NFC_WI_MGMT_GATE                  0xA1
 110
 111 static u8 pn544_custom_gates[] = {
 112         PN544_SYS_MGMT_GATE,
 113         PN544_SWP_MGMT_GATE,
 114         PN544_POLLING_LOOP_MGMT_GATE,
 115         PN544_NFC_WI_MGMT_GATE,
 116         PN544_RF_READER_F_GATE,
 117         PN544_RF_READER_JEWEL_GATE,
 118         PN544_RF_READER_ISO15693_GATE,
 119         PN544_RF_READER_NFCIP1_INITIATOR_GATE,
 120         PN544_RF_READER_NFCIP1_TARGET_GATE
 121 };
 122
 123 /* Largest headroom needed for outgoing custom commands */
 124 #define PN544_CMDS_HEADROOM     2
 125
 126 struct pn544_hci_info {
 127         struct i2c_client *i2c_dev;
 128         struct nfc_shdlc *shdlc;
 129
 130         enum pn544_state state;
 131
 132         struct mutex info_lock;
 133
 134         unsigned int gpio_en;
 135         unsigned int gpio_irq;
 136         unsigned int gpio_fw;
 137         unsigned int en_polarity;
 138
 139         int hard_fault;         /*
 140                                  * < 0 if hardware error occured (e.g. i2c err)
 141                                  * and prevents normal operation.
 142                                  */
 143 };
 144
 145 static void pn544_hci_platform_init(struct pn544_hci_info *info)
 146 {
 147         int polarity, retry, ret;
 148         char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
 149         int count = sizeof(rset_cmd);
 150
 151         pr_info(DRIVER_DESC ": %s\n", __func__);
 152         dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
 153
 154         /* Disable fw download */
 155         gpio_set_value(info->gpio_fw, 0);
 156
 157         for (polarity = 0; polarity < 2; polarity++) {
 158                 info->en_polarity = polarity;
 159                 retry = 3;
 160                 while (retry--) {
 161                         /* power off */
 162                         gpio_set_value(info->gpio_en, !info->en_polarity);
 163                         usleep_range(10000, 15000);
 164
 165                         /* power on */
 166                         gpio_set_value(info->gpio_en, info->en_polarity);
 167                         usleep_range(10000, 15000);
 168
 169                         /* send reset */
 170                         dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
 171                         ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
 172                         if (ret == count) {
 173                                 dev_info(&info->i2c_dev->dev,
 174                                          "nfc_en polarity : active %s\n",
 175                                          (polarity == 0 ? "low" : "high"));
 176                                 goto out;
 177                         }
 178                 }
 179         }
 180
 181         dev_err(&info->i2c_dev->dev,
 182                 "Could not detect nfc_en polarity, fallback to active high\n");
 183
 184 out:
 185         gpio_set_value(info->gpio_en, !info->en_polarity);
 186 }
 187
 188 static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
 189 {
 190         pr_info(DRIVER_DESC ": %s\n", __func__);
 191
 192         gpio_set_value(info->gpio_fw, 0);
 193         gpio_set_value(info->gpio_en, info->en_polarity);
 194         usleep_range(10000, 15000);
 195
 196         return 0;
 197 }
 198
 199 static void pn544_hci_disable(struct pn544_hci_info *info)
 200 {
 201         pr_info(DRIVER_DESC ": %s\n", __func__);
 202
 203         gpio_set_value(info->gpio_fw, 0);
 204         gpio_set_value(info->gpio_en, !info->en_polarity);
 205         usleep_range(10000, 15000);
 206
 207         gpio_set_value(info->gpio_en, info->en_polarity);
 208         usleep_range(10000, 15000);
 209
 210         gpio_set_value(info->gpio_en, !info->en_polarity);
 211         usleep_range(10000, 15000);
 212 }
 213
 214 static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
 215 {
 216         int r;
 217
 218         usleep_range(3000, 6000);
 219
 220         r = i2c_master_send(client, buf, len);
 221
 222         if (r == -EREMOTEIO) {  /* Retry, chip was in standby */
 223                 usleep_range(6000, 10000);
 224                 r = i2c_master_send(client, buf, len);
 225         }
 226
 227         if (r >= 0 && r != len)
 228                 r = -EREMOTEIO;
 229
 230         return r;
 231 }
 232
 233 static int check_crc(u8 *buf, int buflen)
 234 {
 235         int len;
 236         u16 crc;
 237
 238         len = buf[0] + 1;
 239         crc = crc_ccitt(0xffff, buf, len - 2);
 240         crc = ~crc;
 241
 242         if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
 243                 pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
 244                        crc, buf[len - 1], buf[len - 2]);
 245
 246                 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
 247                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
 248                                16, 2, buf, buflen, false);
 249                 return -EPERM;
 250         }
 251         return 0;
 252 }
 253
 254 /*
 255  * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
 256  * that i2c bus will be flushed and that next read will start on a new frame.
 257  * returned skb contains only LLC header and payload.
 258  * returns:
 259  * -EREMOTEIO : i2c read error (fatal)
 260  * -EBADMSG : frame was incorrect and discarded
 261  * -ENOMEM : cannot allocate skb, frame dropped
 262  */
 263 static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
 264 {
 265         int r;
 266         u8 len;
 267         u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
 268
 269         r = i2c_master_recv(client, &len, 1);
 270         if (r != 1) {
 271                 dev_err(&client->dev, "cannot read len byte\n");
 272                 return -EREMOTEIO;
 273         }
 274
 275         if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
 276             (len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
 277                 dev_err(&client->dev, "invalid len byte\n");
 278                 r = -EBADMSG;
 279                 goto flush;
 280         }
 281
 282         *skb = alloc_skb(1 + len, GFP_KERNEL);
 283         if (*skb == NULL) {
 284                 r = -ENOMEM;
 285                 goto flush;
 286         }
 287
 288         *skb_put(*skb, 1) = len;
 289
 290         r = i2c_master_recv(client, skb_put(*skb, len), len);
 291         if (r != len) {
 292                 kfree_skb(*skb);
 293                 return -EREMOTEIO;
 294         }
 295
 296         r = check_crc((*skb)->data, (*skb)->len);
 297         if (r != 0) {
 298                 kfree_skb(*skb);
 299                 r = -EBADMSG;
 300                 goto flush;
 301         }
 302
 303         skb_pull(*skb, 1);
 304         skb_trim(*skb, (*skb)->len - 2);
 305
 306         usleep_range(3000, 6000);
 307
 308         return 0;
 309
 310 flush:
 311         if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
 312                 r = -EREMOTEIO;
 313
 314         usleep_range(3000, 6000);
 315
 316         return r;
 317 }
 318
 319 /*
 320  * Reads an shdlc frame from the chip. This is not as straightforward as it
 321  * seems. There are cases where we could loose the frame start synchronization.
 322  * The frame format is len-data-crc, and corruption can occur anywhere while
 323  * transiting on i2c bus, such that we could read an invalid len.
 324  * In order to recover synchronization with the next frame, we must be sure
 325  * to read the real amount of data without using the len byte. We do this by
 326  * assuming the following:
 327  * - the chip will always present only one single complete frame on the bus
 328  *   before triggering the interrupt
 329  * - the chip will not present a new frame until we have completely read
 330  *   the previous one (or until we have handled the interrupt).
 331  * The tricky case is when we read a corrupted len that is less than the real
 332  * len. We must detect this here in order to determine that we need to flush
 333  * the bus. This is the reason why we check the crc here.
 334  */
 335 static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
 336 {
 337         struct pn544_hci_info *info = dev_id;
 338         struct i2c_client *client = info->i2c_dev;
 339         struct sk_buff *skb = NULL;
 340         int r;
 341
 342         BUG_ON(!info);
 343         BUG_ON(irq != info->i2c_dev->irq);
 344
 345         dev_dbg(&client->dev, "IRQ\n");
 346
 347         if (info->hard_fault != 0)
 348                 return IRQ_HANDLED;
 349
 350         r = pn544_hci_i2c_read(client, &skb);
 351         if (r == -EREMOTEIO) {
 352                 info->hard_fault = r;
 353
 354                 nfc_shdlc_recv_frame(info->shdlc, NULL);
 355
 356                 return IRQ_HANDLED;
 357         } else if ((r == -ENOMEM) || (r == -EBADMSG)) {
 358                 return IRQ_HANDLED;
 359         }
 360
 361         nfc_shdlc_recv_frame(info->shdlc, skb);
 362
 363         return IRQ_HANDLED;
 364 }
 365
 366 static int pn544_hci_open(struct nfc_shdlc *shdlc)
 367 {
 368         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 369         int r = 0;
 370
 371         mutex_lock(&info->info_lock);
 372
 373         if (info->state != PN544_ST_COLD) {
 374                 r = -EBUSY;
 375                 goto out;
 376         }
 377
 378         r = pn544_hci_enable(info, HCI_MODE);
 379
 380 out:
 381         mutex_unlock(&info->info_lock);
 382         return r;
 383 }
 384
 385 static void pn544_hci_close(struct nfc_shdlc *shdlc)
 386 {
 387         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 388
 389         mutex_lock(&info->info_lock);
 390
 391         if (info->state == PN544_ST_COLD)
 392                 goto out;
 393
 394         pn544_hci_disable(info);
 395
 396 out:
 397         mutex_unlock(&info->info_lock);
 398 }
 399
 400 static int pn544_hci_ready(struct nfc_shdlc *shdlc)
 401 {
 402         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 403         struct sk_buff *skb;
 404         static struct hw_config {
 405                 u8 adr[2];
 406                 u8 value;
 407         } hw_config[] = {
 408                 {{0x9f, 0x9a}, 0x00},
 409
 410                 {{0x98, 0x10}, 0xbc},
 411
 412                 {{0x9e, 0x71}, 0x00},
 413
 414                 {{0x98, 0x09}, 0x00},
 415
 416                 {{0x9e, 0xb4}, 0x00},
 417
 418                 {{0x9e, 0xd9}, 0xff},
 419                 {{0x9e, 0xda}, 0xff},
 420                 {{0x9e, 0xdb}, 0x23},
 421                 {{0x9e, 0xdc}, 0x21},
 422                 {{0x9e, 0xdd}, 0x22},
 423                 {{0x9e, 0xde}, 0x24},
 424
 425                 {{0x9c, 0x01}, 0x08},
 426
 427                 {{0x9e, 0xaa}, 0x01},
 428
 429                 {{0x9b, 0xd1}, 0x0d},
 430                 {{0x9b, 0xd2}, 0x24},
 431                 {{0x9b, 0xd3}, 0x0a},
 432                 {{0x9b, 0xd4}, 0x22},
 433                 {{0x9b, 0xd5}, 0x08},
 434                 {{0x9b, 0xd6}, 0x1e},
 435                 {{0x9b, 0xdd}, 0x1c},
 436
 437                 {{0x9b, 0x84}, 0x13},
 438                 {{0x99, 0x81}, 0x7f},
 439                 {{0x99, 0x31}, 0x70},
 440
 441                 {{0x98, 0x00}, 0x3f},
 442
 443                 {{0x9f, 0x09}, 0x00},
 444
 445                 {{0x9f, 0x0a}, 0x05},
 446
 447                 {{0x9e, 0xd1}, 0xa1},
 448                 {{0x99, 0x23}, 0x00},
 449
 450                 {{0x9e, 0x74}, 0x80},
 451
 452                 {{0x9f, 0x28}, 0x10},
 453
 454                 {{0x9f, 0x35}, 0x14},
 455
 456                 {{0x9f, 0x36}, 0x60},
 457
 458                 {{0x9c, 0x31}, 0x00},
 459
 460                 {{0x9c, 0x32}, 0xc8},
 461
 462                 {{0x9c, 0x19}, 0x40},
 463
 464                 {{0x9c, 0x1a}, 0x40},
 465
 466                 {{0x9c, 0x0c}, 0x00},
 467
 468                 {{0x9c, 0x0d}, 0x00},
 469
 470                 {{0x9c, 0x12}, 0x00},
 471
 472                 {{0x9c, 0x13}, 0x00},
 473
 474                 {{0x98, 0xa2}, 0x0e},
 475
 476                 {{0x98, 0x93}, 0x40},
 477
 478                 {{0x98, 0x7d}, 0x02},
 479                 {{0x98, 0x7e}, 0x00},
 480                 {{0x9f, 0xc8}, 0x01},
 481         };
 482         struct hw_config *p = hw_config;
 483         int count = ARRAY_SIZE(hw_config);
 484         struct sk_buff *res_skb;
 485         u8 param[4];
 486         int r;
 487
 488         param[0] = 0;
 489         while (count--) {
 490                 param[1] = p->adr[0];
 491                 param[2] = p->adr[1];
 492                 param[3] = p->value;
 493
 494                 r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
 495                                      param, 4, &res_skb);
 496                 if (r < 0)
 497                         return r;
 498
 499                 if (res_skb->len != 1) {
 500                         kfree_skb(res_skb);
 501                         return -EPROTO;
 502                 }
 503
 504                 if (res_skb->data[0] != p->value) {
 505                         kfree_skb(res_skb);
 506                         return -EIO;
 507                 }
 508
 509                 kfree_skb(res_skb);
 510
 511                 p++;
 512         }
 513
 514         param[0] = NFC_HCI_UICC_HOST_ID;
 515         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 516                               NFC_HCI_ADMIN_WHITELIST, param, 1);
 517         if (r < 0)
 518                 return r;
 519
 520         param[0] = 0x3d;
 521         r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
 522                               PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
 523         if (r < 0)
 524                 return r;
 525
 526         param[0] = 0x0;
 527         r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
 528                               PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
 529         if (r < 0)
 530                 return r;
 531
 532         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 533                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 534         if (r < 0)
 535                 return r;
 536
 537         param[0] = 0x1;
 538         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 539                               PN544_PL_NFCT_DEACTIVATED, param, 1);
 540         if (r < 0)
 541                 return r;
 542
 543         param[0] = 0x0;
 544         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 545                               PN544_PL_RDPHASES, param, 1);
 546         if (r < 0)
 547                 return r;
 548
 549         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 550                               PN544_ID_MGMT_FULL_VERSION_SW, &skb);
 551         if (r < 0)
 552                 return r;
 553
 554         if (skb->len != FULL_VERSION_LEN) {
 555                 kfree_skb(skb);
 556                 return -EINVAL;
 557         }
 558
 559         print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
 560                        DUMP_PREFIX_NONE, 16, 1,
 561                        skb->data, FULL_VERSION_LEN, false);
 562
 563         kfree_skb(skb);
 564
 565         return 0;
 566 }
 567
 568 static int pn544_hci_xmit(struct nfc_shdlc *shdlc, struct sk_buff *skb)
 569 {
 570         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 571         struct i2c_client *client = info->i2c_dev;
 572
 573         if (info->hard_fault != 0)
 574                 return info->hard_fault;
 575
 576         return pn544_hci_i2c_write(client, skb->data, skb->len);
 577 }
 578
 579 static int pn544_hci_start_poll(struct nfc_shdlc *shdlc,
 580                                 u32 im_protocols, u32 tm_protocols)
 581 {
 582         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 583         u8 phases = 0;
 584         int r;
 585         u8 duration[2];
 586         u8 activated;
 587
 588         pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
 589                 __func__, im_protocols, tm_protocols);
 590
 591         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 592                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 593         if (r < 0)
 594                 return r;
 595
 596         duration[0] = 0x18;
 597         duration[1] = 0x6a;
 598         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 599                               PN544_PL_EMULATION, duration, 2);
 600         if (r < 0)
 601                 return r;
 602
 603         activated = 0;
 604         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 605                               PN544_PL_NFCT_DEACTIVATED, &activated, 1);
 606         if (r < 0)
 607                 return r;
 608
 609         if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
 610                          NFC_PROTO_JEWEL_MASK))
 611                 phases |= 1;            /* Type A */
 612         if (im_protocols & NFC_PROTO_FELICA_MASK) {
 613                 phases |= (1 << 2);     /* Type F 212 */
 614                 phases |= (1 << 3);     /* Type F 424 */
 615         }
 616
 617         phases |= (1 << 5);             /* NFC active */
 618
 619         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 620                               PN544_PL_RDPHASES, &phases, 1);
 621         if (r < 0)
 622                 return r;
 623
 624         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 625                                NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 626         if (r < 0)
 627                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 628                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 629
 630         return r;
 631 }
 632
 633 static int pn544_hci_target_from_gate(struct nfc_shdlc *shdlc, u8 gate,
 634                                       struct nfc_target *target)
 635 {
 636         switch (gate) {
 637         case PN544_RF_READER_F_GATE:
 638                 target->supported_protocols = NFC_PROTO_FELICA_MASK;
 639                 break;
 640         case PN544_RF_READER_JEWEL_GATE:
 641                 target->supported_protocols = NFC_PROTO_JEWEL_MASK;
 642                 target->sens_res = 0x0c00;
 643                 break;
 644         default:
 645                 return -EPROTO;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static int pn544_hci_complete_target_discovered(struct nfc_shdlc *shdlc,
 652                                                 u8 gate,
 653                                                 struct nfc_target *target)
 654 {
 655         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 656         struct sk_buff *uid_skb;
 657         int r = 0;
 658
 659         if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 660                 if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
 661                     target->nfcid1_len != 10)
 662                         return -EPROTO;
 663
 664                 r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 665                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 666                                      target->nfcid1, target->nfcid1_len, NULL);
 667         } else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
 668                 r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
 669                                       PN544_FELICA_ID, &uid_skb);
 670                 if (r < 0)
 671                         return r;
 672
 673                 if (uid_skb->len != 8) {
 674                         kfree_skb(uid_skb);
 675                         return -EPROTO;
 676                 }
 677
 678                 r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
 679                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 680                                      uid_skb->data, uid_skb->len, NULL);
 681                 kfree_skb(uid_skb);
 682         } else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
 683                 /*
 684                  * TODO: maybe other ISO 14443 require some kind of continue
 685                  * activation, but for now we've seen only this one below.
 686                  */
 687                 if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
 688                         r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 689                               PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
 690                               NULL, 0, NULL);
 691         }
 692
 693         return r;
 694 }
 695
 696 #define MIFARE_CMD_AUTH_KEY_A   0x60
 697 #define MIFARE_CMD_AUTH_KEY_B   0x61
 698 #define MIFARE_CMD_HEADER       2
 699 #define MIFARE_UID_LEN          4
 700 #define MIFARE_KEY_LEN          6
 701 #define MIFARE_CMD_LEN          12
 702 /*
 703  * Returns:
 704  * <= 0: driver handled the data exchange
 705  *    1: driver doesn't especially handle, please do standard processing
 706  */
 707 static int pn544_hci_data_exchange(struct nfc_shdlc *shdlc,
 708                                    struct nfc_target *target,
 709                                    struct sk_buff *skb,
 710                                    struct sk_buff **res_skb)
 711 {
 712         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 713         int r;
 714
 715         pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
 716                 target->hci_reader_gate);
 717
 718         switch (target->hci_reader_gate) {
 719         case NFC_HCI_RF_READER_A_GATE:
 720                 if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 721                         /*
 722                          * It seems that pn544 is inverting key and UID for
 723                          * MIFARE authentication commands.
 724                          */
 725                         if (skb->len == MIFARE_CMD_LEN &&
 726                             (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
 727                              skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
 728                                 u8 uid[MIFARE_UID_LEN];
 729                                 u8 *data = skb->data + MIFARE_CMD_HEADER;
 730
 731                                 memcpy(uid, data + MIFARE_KEY_LEN,
 732                                        MIFARE_UID_LEN);
 733                                 memmove(data + MIFARE_UID_LEN, data,
 734                                         MIFARE_KEY_LEN);
 735                                 memcpy(data, uid, MIFARE_UID_LEN);
 736                         }
 737
 738                         return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 739                                                 PN544_MIFARE_CMD,
 740                                                 skb->data, skb->len, res_skb);
 741                 } else
 742                         return 1;
 743         case PN544_RF_READER_F_GATE:
 744                 *skb_push(skb, 1) = 0;
 745                 *skb_push(skb, 1) = 0;
 746
 747                 r = nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 748                                      PN544_FELICA_RAW,
 749                                      skb->data, skb->len, res_skb);
 750                 if (r == 0)
 751                         skb_pull(*res_skb, 1);
 752                 return r;
 753         case PN544_RF_READER_JEWEL_GATE:
 754                 return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 755                                         PN544_JEWEL_RAW_CMD,
 756                                         skb->data, skb->len, res_skb);
 757         default:
 758                 return 1;
 759         }
 760 }
 761
 762 static int pn544_hci_check_presence(struct nfc_shdlc *shdlc,
 763                                    struct nfc_target *target)
 764 {
 765         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 766
 767         return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 768                                 PN544_RF_READER_CMD_PRESENCE_CHECK,
 769                                 NULL, 0, NULL);
 770 }
 771
 772 static struct nfc_shdlc_ops pn544_shdlc_ops = {
 773         .open = pn544_hci_open,
 774         .close = pn544_hci_close,
 775         .hci_ready = pn544_hci_ready,
 776         .xmit = pn544_hci_xmit,
 777         .start_poll = pn544_hci_start_poll,
 778         .target_from_gate = pn544_hci_target_from_gate,
 779         .complete_target_discovered = pn544_hci_complete_target_discovered,
 780         .data_exchange = pn544_hci_data_exchange,
 781         .check_presence = pn544_hci_check_presence,
 782 };
 783
 784 static int __devinit pn544_hci_probe(struct i2c_client *client,
 785                                      const struct i2c_device_id *id)
 786 {
 787         struct pn544_hci_info *info;
 788         struct pn544_nfc_platform_data *pdata;
 789         int r = 0;
 790         u32 protocols;
 791         struct nfc_hci_init_data init_data;
 792
 793         dev_dbg(&client->dev, "%s\n", __func__);
 794         dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
 795
 796         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 797                 dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
 798                 return -ENODEV;
 799         }
 800
 801         info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
 802         if (!info) {
 803                 dev_err(&client->dev,
 804                         "Cannot allocate memory for pn544_hci_info.\n");
 805                 r = -ENOMEM;
 806                 goto err_info_alloc;
 807         }
 808
 809         info->i2c_dev = client;
 810         info->state = PN544_ST_COLD;
 811         mutex_init(&info->info_lock);
 812         i2c_set_clientdata(client, info);
 813
 814         pdata = client->dev.platform_data;
 815         if (pdata == NULL) {
 816                 dev_err(&client->dev, "No platform data\n");
 817                 r = -EINVAL;
 818                 goto err_pdata;
 819         }
 820
 821         if (pdata->request_resources == NULL) {
 822                 dev_err(&client->dev, "request_resources() missing\n");
 823                 r = -EINVAL;
 824                 goto err_pdata;
 825         }
 826
 827         r = pdata->request_resources(client);
 828         if (r) {
 829                 dev_err(&client->dev, "Cannot get platform resources\n");
 830                 goto err_pdata;
 831         }
 832
 833         info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
 834         info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
 835         info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
 836
 837         pn544_hci_platform_init(info);
 838
 839         r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
 840                                  IRQF_TRIGGER_RISING, PN544_HCI_DRIVER_NAME,
 841                                  info);
 842         if (r < 0) {
 843                 dev_err(&client->dev, "Unable to register IRQ handler\n");
 844                 goto err_rti;
 845         }
 846
 847         init_data.gate_count = ARRAY_SIZE(pn544_custom_gates);
 848
 849         memcpy(init_data.gates, pn544_custom_gates,
 850                ARRAY_SIZE(pn544_custom_gates));
 851
 852         /*
 853          * TODO: Session id must include the driver name + some bus addr
 854          * persistent info to discriminate 2 identical chips
 855          */
 856         strcpy(init_data.session_id, "ID544HCI");
 857
 858         protocols = NFC_PROTO_JEWEL_MASK |
 859                     NFC_PROTO_MIFARE_MASK |
 860                     NFC_PROTO_FELICA_MASK |
 861                     NFC_PROTO_ISO14443_MASK |
 862                     NFC_PROTO_NFC_DEP_MASK;
 863
 864         info->shdlc = nfc_shdlc_allocate(&pn544_shdlc_ops,
 865                                          &init_data, protocols,
 866                                          PN544_CMDS_HEADROOM, 0,
 867                                          PN544_HCI_LLC_MAX_PAYLOAD,
 868                                          dev_name(&client->dev));
 869         if (!info->shdlc) {
 870                 dev_err(&client->dev, "Cannot allocate nfc shdlc.\n");
 871                 r = -ENOMEM;
 872                 goto err_allocshdlc;
 873         }
 874
 875         nfc_shdlc_set_clientdata(info->shdlc, info);
 876
 877         return 0;
 878
 879 err_allocshdlc:
 880         free_irq(client->irq, info);
 881
 882 err_rti:
 883         if (pdata->free_resources != NULL)
 884                 pdata->free_resources();
 885
 886 err_pdata:
 887         kfree(info);
 888
 889 err_info_alloc:
 890         return r;
 891 }
 892
 893 static __devexit int pn544_hci_remove(struct i2c_client *client)
 894 {
 895         struct pn544_hci_info *info = i2c_get_clientdata(client);
 896         struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
 897
 898         dev_dbg(&client->dev, "%s\n", __func__);
 899
 900         nfc_shdlc_free(info->shdlc);
 901
 902         if (info->state != PN544_ST_COLD) {
 903                 if (pdata->disable)
 904                         pdata->disable();
 905         }
 906
 907         free_irq(client->irq, info);
 908         if (pdata->free_resources)
 909                 pdata->free_resources();
 910
 911         kfree(info);
 912
 913         return 0;
 914 }
 915
 916 static struct i2c_driver pn544_hci_driver = {
 917         .driver = {
 918                    .name = PN544_HCI_DRIVER_NAME,
 919                   },
 920         .probe = pn544_hci_probe,
 921         .id_table = pn544_hci_id_table,
 922         .remove = __devexit_p(pn544_hci_remove),
 923 };
 924
 925 static int __init pn544_hci_init(void)
 926 {
 927         int r;
 928
 929         pr_debug(DRIVER_DESC ": %s\n", __func__);
 930
 931         r = i2c_add_driver(&pn544_hci_driver);
 932         if (r) {
 933                 pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
 934                 return r;
 935         }
 936
 937         return 0;
 938 }
 939
 940 static void __exit pn544_hci_exit(void)
 941 {
 942         i2c_del_driver(&pn544_hci_driver);
 943 }
 944
 945 module_init(pn544_hci_init);
 946 module_exit(pn544_hci_exit);
 947
 948 MODULE_LICENSE("GPL");
 949 MODULE_DESCRIPTION(DRIVER_DESC);