Pileus Git - ~andy/linux/blob - 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 struct nfc_hci_gate pn544_gates[] = {
 112         {NFC_HCI_ADMIN_GATE, NFC_HCI_INVALID_PIPE},
 113         {NFC_HCI_LOOPBACK_GATE, NFC_HCI_INVALID_PIPE},
 114         {NFC_HCI_ID_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 115         {NFC_HCI_LINK_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 116         {NFC_HCI_RF_READER_B_GATE, NFC_HCI_INVALID_PIPE},
 117         {NFC_HCI_RF_READER_A_GATE, NFC_HCI_INVALID_PIPE},
 118         {PN544_SYS_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 119         {PN544_SWP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 120         {PN544_POLLING_LOOP_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 121         {PN544_NFC_WI_MGMT_GATE, NFC_HCI_INVALID_PIPE},
 122         {PN544_RF_READER_F_GATE, NFC_HCI_INVALID_PIPE},
 123         {PN544_RF_READER_JEWEL_GATE, NFC_HCI_INVALID_PIPE},
 124         {PN544_RF_READER_ISO15693_GATE, NFC_HCI_INVALID_PIPE},
 125         {PN544_RF_READER_NFCIP1_INITIATOR_GATE, NFC_HCI_INVALID_PIPE},
 126         {PN544_RF_READER_NFCIP1_TARGET_GATE, NFC_HCI_INVALID_PIPE}
 127 };
 128
 129 /* Largest headroom needed for outgoing custom commands */
 130 #define PN544_CMDS_HEADROOM     2
 131 #define PN544_FRAME_HEADROOM 1
 132 #define PN544_FRAME_TAILROOM 2
 133
 134 struct pn544_hci_info {
 135         struct i2c_client *i2c_dev;
 136         struct nfc_shdlc *shdlc;
 137
 138         enum pn544_state state;
 139
 140         struct mutex info_lock;
 141
 142         unsigned int gpio_en;
 143         unsigned int gpio_irq;
 144         unsigned int gpio_fw;
 145         unsigned int en_polarity;
 146
 147         int hard_fault;         /*
 148                                  * < 0 if hardware error occured (e.g. i2c err)
 149                                  * and prevents normal operation.
 150                                  */
 151         int async_cb_type;
 152         data_exchange_cb_t async_cb;
 153         void *async_cb_context;
 154 };
 155
 156 static void pn544_hci_platform_init(struct pn544_hci_info *info)
 157 {
 158         int polarity, retry, ret;
 159         char rset_cmd[] = { 0x05, 0xF9, 0x04, 0x00, 0xC3, 0xE5 };
 160         int count = sizeof(rset_cmd);
 161
 162         pr_info(DRIVER_DESC ": %s\n", __func__);
 163         dev_info(&info->i2c_dev->dev, "Detecting nfc_en polarity\n");
 164
 165         /* Disable fw download */
 166         gpio_set_value(info->gpio_fw, 0);
 167
 168         for (polarity = 0; polarity < 2; polarity++) {
 169                 info->en_polarity = polarity;
 170                 retry = 3;
 171                 while (retry--) {
 172                         /* power off */
 173                         gpio_set_value(info->gpio_en, !info->en_polarity);
 174                         usleep_range(10000, 15000);
 175
 176                         /* power on */
 177                         gpio_set_value(info->gpio_en, info->en_polarity);
 178                         usleep_range(10000, 15000);
 179
 180                         /* send reset */
 181                         dev_dbg(&info->i2c_dev->dev, "Sending reset cmd\n");
 182                         ret = i2c_master_send(info->i2c_dev, rset_cmd, count);
 183                         if (ret == count) {
 184                                 dev_info(&info->i2c_dev->dev,
 185                                          "nfc_en polarity : active %s\n",
 186                                          (polarity == 0 ? "low" : "high"));
 187                                 goto out;
 188                         }
 189                 }
 190         }
 191
 192         dev_err(&info->i2c_dev->dev,
 193                 "Could not detect nfc_en polarity, fallback to active high\n");
 194
 195 out:
 196         gpio_set_value(info->gpio_en, !info->en_polarity);
 197 }
 198
 199 static int pn544_hci_enable(struct pn544_hci_info *info, int mode)
 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         return 0;
 208 }
 209
 210 static void pn544_hci_disable(struct pn544_hci_info *info)
 211 {
 212         pr_info(DRIVER_DESC ": %s\n", __func__);
 213
 214         gpio_set_value(info->gpio_fw, 0);
 215         gpio_set_value(info->gpio_en, !info->en_polarity);
 216         usleep_range(10000, 15000);
 217
 218         gpio_set_value(info->gpio_en, info->en_polarity);
 219         usleep_range(10000, 15000);
 220
 221         gpio_set_value(info->gpio_en, !info->en_polarity);
 222         usleep_range(10000, 15000);
 223 }
 224
 225 static int pn544_hci_i2c_write(struct i2c_client *client, u8 *buf, int len)
 226 {
 227         int r;
 228
 229         usleep_range(3000, 6000);
 230
 231         r = i2c_master_send(client, buf, len);
 232
 233         if (r == -EREMOTEIO) {  /* Retry, chip was in standby */
 234                 usleep_range(6000, 10000);
 235                 r = i2c_master_send(client, buf, len);
 236         }
 237
 238         if (r >= 0 && r != len)
 239                 r = -EREMOTEIO;
 240
 241         return r;
 242 }
 243
 244 static int check_crc(u8 *buf, int buflen)
 245 {
 246         int len;
 247         u16 crc;
 248
 249         len = buf[0] + 1;
 250         crc = crc_ccitt(0xffff, buf, len - 2);
 251         crc = ~crc;
 252
 253         if (buf[len - 2] != (crc & 0xff) || buf[len - 1] != (crc >> 8)) {
 254                 pr_err(PN544_HCI_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
 255                        crc, buf[len - 1], buf[len - 2]);
 256
 257                 pr_info(DRIVER_DESC ": %s : BAD CRC\n", __func__);
 258                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
 259                                16, 2, buf, buflen, false);
 260                 return -EPERM;
 261         }
 262         return 0;
 263 }
 264
 265 /*
 266  * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees
 267  * that i2c bus will be flushed and that next read will start on a new frame.
 268  * returned skb contains only LLC header and payload.
 269  * returns:
 270  * -EREMOTEIO : i2c read error (fatal)
 271  * -EBADMSG : frame was incorrect and discarded
 272  * -ENOMEM : cannot allocate skb, frame dropped
 273  */
 274 static int pn544_hci_i2c_read(struct i2c_client *client, struct sk_buff **skb)
 275 {
 276         int r;
 277         u8 len;
 278         u8 tmp[PN544_HCI_LLC_MAX_SIZE - 1];
 279
 280         r = i2c_master_recv(client, &len, 1);
 281         if (r != 1) {
 282                 dev_err(&client->dev, "cannot read len byte\n");
 283                 return -EREMOTEIO;
 284         }
 285
 286         if ((len < (PN544_HCI_LLC_MIN_SIZE - 1)) ||
 287             (len > (PN544_HCI_LLC_MAX_SIZE - 1))) {
 288                 dev_err(&client->dev, "invalid len byte\n");
 289                 r = -EBADMSG;
 290                 goto flush;
 291         }
 292
 293         *skb = alloc_skb(1 + len, GFP_KERNEL);
 294         if (*skb == NULL) {
 295                 r = -ENOMEM;
 296                 goto flush;
 297         }
 298
 299         *skb_put(*skb, 1) = len;
 300
 301         r = i2c_master_recv(client, skb_put(*skb, len), len);
 302         if (r != len) {
 303                 kfree_skb(*skb);
 304                 return -EREMOTEIO;
 305         }
 306
 307         r = check_crc((*skb)->data, (*skb)->len);
 308         if (r != 0) {
 309                 kfree_skb(*skb);
 310                 r = -EBADMSG;
 311                 goto flush;
 312         }
 313
 314         skb_pull(*skb, 1);
 315         skb_trim(*skb, (*skb)->len - 2);
 316
 317         usleep_range(3000, 6000);
 318
 319         return 0;
 320
 321 flush:
 322         if (i2c_master_recv(client, tmp, sizeof(tmp)) < 0)
 323                 r = -EREMOTEIO;
 324
 325         usleep_range(3000, 6000);
 326
 327         return r;
 328 }
 329
 330 /*
 331  * Reads an shdlc frame from the chip. This is not as straightforward as it
 332  * seems. There are cases where we could loose the frame start synchronization.
 333  * The frame format is len-data-crc, and corruption can occur anywhere while
 334  * transiting on i2c bus, such that we could read an invalid len.
 335  * In order to recover synchronization with the next frame, we must be sure
 336  * to read the real amount of data without using the len byte. We do this by
 337  * assuming the following:
 338  * - the chip will always present only one single complete frame on the bus
 339  *   before triggering the interrupt
 340  * - the chip will not present a new frame until we have completely read
 341  *   the previous one (or until we have handled the interrupt).
 342  * The tricky case is when we read a corrupted len that is less than the real
 343  * len. We must detect this here in order to determine that we need to flush
 344  * the bus. This is the reason why we check the crc here.
 345  */
 346 static irqreturn_t pn544_hci_irq_thread_fn(int irq, void *dev_id)
 347 {
 348         struct pn544_hci_info *info = dev_id;
 349         struct i2c_client *client = info->i2c_dev;
 350         struct sk_buff *skb = NULL;
 351         int r;
 352
 353         BUG_ON(!info);
 354         BUG_ON(irq != info->i2c_dev->irq);
 355
 356         dev_dbg(&client->dev, "IRQ\n");
 357
 358         if (info->hard_fault != 0)
 359                 return IRQ_HANDLED;
 360
 361         r = pn544_hci_i2c_read(client, &skb);
 362         if (r == -EREMOTEIO) {
 363                 info->hard_fault = r;
 364
 365                 nfc_shdlc_recv_frame(info->shdlc, NULL);
 366
 367                 return IRQ_HANDLED;
 368         } else if ((r == -ENOMEM) || (r == -EBADMSG)) {
 369                 return IRQ_HANDLED;
 370         }
 371
 372         nfc_shdlc_recv_frame(info->shdlc, skb);
 373
 374         return IRQ_HANDLED;
 375 }
 376
 377 static int pn544_hci_open(struct nfc_shdlc *shdlc)
 378 {
 379         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 380         int r = 0;
 381
 382         mutex_lock(&info->info_lock);
 383
 384         if (info->state != PN544_ST_COLD) {
 385                 r = -EBUSY;
 386                 goto out;
 387         }
 388
 389         r = pn544_hci_enable(info, HCI_MODE);
 390
 391         if (r == 0)
 392                 info->state = PN544_ST_READY;
 393
 394 out:
 395         mutex_unlock(&info->info_lock);
 396         return r;
 397 }
 398
 399 static void pn544_hci_close(struct nfc_shdlc *shdlc)
 400 {
 401         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 402
 403         mutex_lock(&info->info_lock);
 404
 405         if (info->state == PN544_ST_COLD)
 406                 goto out;
 407
 408         pn544_hci_disable(info);
 409
 410         info->state = PN544_ST_COLD;
 411
 412 out:
 413         mutex_unlock(&info->info_lock);
 414 }
 415
 416 static int pn544_hci_ready(struct nfc_shdlc *shdlc)
 417 {
 418         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 419         struct sk_buff *skb;
 420         static struct hw_config {
 421                 u8 adr[2];
 422                 u8 value;
 423         } hw_config[] = {
 424                 {{0x9f, 0x9a}, 0x00},
 425
 426                 {{0x98, 0x10}, 0xbc},
 427
 428                 {{0x9e, 0x71}, 0x00},
 429
 430                 {{0x98, 0x09}, 0x00},
 431
 432                 {{0x9e, 0xb4}, 0x00},
 433
 434                 {{0x9e, 0xd9}, 0xff},
 435                 {{0x9e, 0xda}, 0xff},
 436                 {{0x9e, 0xdb}, 0x23},
 437                 {{0x9e, 0xdc}, 0x21},
 438                 {{0x9e, 0xdd}, 0x22},
 439                 {{0x9e, 0xde}, 0x24},
 440
 441                 {{0x9c, 0x01}, 0x08},
 442
 443                 {{0x9e, 0xaa}, 0x01},
 444
 445                 {{0x9b, 0xd1}, 0x0d},
 446                 {{0x9b, 0xd2}, 0x24},
 447                 {{0x9b, 0xd3}, 0x0a},
 448                 {{0x9b, 0xd4}, 0x22},
 449                 {{0x9b, 0xd5}, 0x08},
 450                 {{0x9b, 0xd6}, 0x1e},
 451                 {{0x9b, 0xdd}, 0x1c},
 452
 453                 {{0x9b, 0x84}, 0x13},
 454                 {{0x99, 0x81}, 0x7f},
 455                 {{0x99, 0x31}, 0x70},
 456
 457                 {{0x98, 0x00}, 0x3f},
 458
 459                 {{0x9f, 0x09}, 0x00},
 460
 461                 {{0x9f, 0x0a}, 0x05},
 462
 463                 {{0x9e, 0xd1}, 0xa1},
 464                 {{0x99, 0x23}, 0x00},
 465
 466                 {{0x9e, 0x74}, 0x80},
 467
 468                 {{0x9f, 0x28}, 0x10},
 469
 470                 {{0x9f, 0x35}, 0x14},
 471
 472                 {{0x9f, 0x36}, 0x60},
 473
 474                 {{0x9c, 0x31}, 0x00},
 475
 476                 {{0x9c, 0x32}, 0xc8},
 477
 478                 {{0x9c, 0x19}, 0x40},
 479
 480                 {{0x9c, 0x1a}, 0x40},
 481
 482                 {{0x9c, 0x0c}, 0x00},
 483
 484                 {{0x9c, 0x0d}, 0x00},
 485
 486                 {{0x9c, 0x12}, 0x00},
 487
 488                 {{0x9c, 0x13}, 0x00},
 489
 490                 {{0x98, 0xa2}, 0x0e},
 491
 492                 {{0x98, 0x93}, 0x40},
 493
 494                 {{0x98, 0x7d}, 0x02},
 495                 {{0x98, 0x7e}, 0x00},
 496                 {{0x9f, 0xc8}, 0x01},
 497         };
 498         struct hw_config *p = hw_config;
 499         int count = ARRAY_SIZE(hw_config);
 500         struct sk_buff *res_skb;
 501         u8 param[4];
 502         int r;
 503
 504         param[0] = 0;
 505         while (count--) {
 506                 param[1] = p->adr[0];
 507                 param[2] = p->adr[1];
 508                 param[3] = p->value;
 509
 510                 r = nfc_hci_send_cmd(hdev, PN544_SYS_MGMT_GATE, PN544_WRITE,
 511                                      param, 4, &res_skb);
 512                 if (r < 0)
 513                         return r;
 514
 515                 if (res_skb->len != 1) {
 516                         kfree_skb(res_skb);
 517                         return -EPROTO;
 518                 }
 519
 520                 if (res_skb->data[0] != p->value) {
 521                         kfree_skb(res_skb);
 522                         return -EIO;
 523                 }
 524
 525                 kfree_skb(res_skb);
 526
 527                 p++;
 528         }
 529
 530         param[0] = NFC_HCI_UICC_HOST_ID;
 531         r = nfc_hci_set_param(hdev, NFC_HCI_ADMIN_GATE,
 532                               NFC_HCI_ADMIN_WHITELIST, param, 1);
 533         if (r < 0)
 534                 return r;
 535
 536         param[0] = 0x3d;
 537         r = nfc_hci_set_param(hdev, PN544_SYS_MGMT_GATE,
 538                               PN544_SYS_MGMT_INFO_NOTIFICATION, param, 1);
 539         if (r < 0)
 540                 return r;
 541
 542         param[0] = 0x0;
 543         r = nfc_hci_set_param(hdev, NFC_HCI_RF_READER_A_GATE,
 544                               PN544_RF_READER_A_AUTO_ACTIVATION, param, 1);
 545         if (r < 0)
 546                 return r;
 547
 548         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 549                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 550         if (r < 0)
 551                 return r;
 552
 553         param[0] = 0x1;
 554         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 555                               PN544_PL_NFCT_DEACTIVATED, param, 1);
 556         if (r < 0)
 557                 return r;
 558
 559         param[0] = 0x0;
 560         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 561                               PN544_PL_RDPHASES, param, 1);
 562         if (r < 0)
 563                 return r;
 564
 565         r = nfc_hci_get_param(hdev, NFC_HCI_ID_MGMT_GATE,
 566                               PN544_ID_MGMT_FULL_VERSION_SW, &skb);
 567         if (r < 0)
 568                 return r;
 569
 570         if (skb->len != FULL_VERSION_LEN) {
 571                 kfree_skb(skb);
 572                 return -EINVAL;
 573         }
 574
 575         print_hex_dump(KERN_DEBUG, "FULL VERSION SOFTWARE INFO: ",
 576                        DUMP_PREFIX_NONE, 16, 1,
 577                        skb->data, FULL_VERSION_LEN, false);
 578
 579         kfree_skb(skb);
 580
 581         return 0;
 582 }
 583
 584 static void pn544_hci_add_len_crc(struct sk_buff *skb)
 585 {
 586         u16 crc;
 587         int len;
 588
 589         len = skb->len + 2;
 590         *skb_push(skb, 1) = len;
 591
 592         crc = crc_ccitt(0xffff, skb->data, skb->len);
 593         crc = ~crc;
 594         *skb_put(skb, 1) = crc & 0xff;
 595         *skb_put(skb, 1) = crc >> 8;
 596 }
 597
 598 static void pn544_hci_remove_len_crc(struct sk_buff *skb)
 599 {
 600         skb_pull(skb, PN544_FRAME_HEADROOM);
 601         skb_trim(skb, PN544_FRAME_TAILROOM);
 602 }
 603
 604 static int pn544_hci_xmit(struct nfc_shdlc *shdlc, struct sk_buff *skb)
 605 {
 606         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 607         struct i2c_client *client = info->i2c_dev;
 608         int r;
 609
 610         if (info->hard_fault != 0)
 611                 return info->hard_fault;
 612
 613         pn544_hci_add_len_crc(skb);
 614         r = pn544_hci_i2c_write(client, skb->data, skb->len);
 615         pn544_hci_remove_len_crc(skb);
 616
 617         return r;
 618 }
 619
 620 static int pn544_hci_start_poll(struct nfc_shdlc *shdlc,
 621                                 u32 im_protocols, u32 tm_protocols)
 622 {
 623         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 624         u8 phases = 0;
 625         int r;
 626         u8 duration[2];
 627         u8 activated;
 628
 629         pr_info(DRIVER_DESC ": %s protocols 0x%x 0x%x\n",
 630                 __func__, im_protocols, tm_protocols);
 631
 632         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 633                                NFC_HCI_EVT_END_OPERATION, NULL, 0);
 634         if (r < 0)
 635                 return r;
 636
 637         duration[0] = 0x18;
 638         duration[1] = 0x6a;
 639         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 640                               PN544_PL_EMULATION, duration, 2);
 641         if (r < 0)
 642                 return r;
 643
 644         activated = 0;
 645         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 646                               PN544_PL_NFCT_DEACTIVATED, &activated, 1);
 647         if (r < 0)
 648                 return r;
 649
 650         if (im_protocols & (NFC_PROTO_ISO14443_MASK | NFC_PROTO_MIFARE_MASK |
 651                          NFC_PROTO_JEWEL_MASK))
 652                 phases |= 1;            /* Type A */
 653         if (im_protocols & NFC_PROTO_FELICA_MASK) {
 654                 phases |= (1 << 2);     /* Type F 212 */
 655                 phases |= (1 << 3);     /* Type F 424 */
 656         }
 657
 658         phases |= (1 << 5);             /* NFC active */
 659
 660         r = nfc_hci_set_param(hdev, PN544_POLLING_LOOP_MGMT_GATE,
 661                               PN544_PL_RDPHASES, &phases, 1);
 662         if (r < 0)
 663                 return r;
 664
 665         r = nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 666                                NFC_HCI_EVT_READER_REQUESTED, NULL, 0);
 667         if (r < 0)
 668                 nfc_hci_send_event(hdev, NFC_HCI_RF_READER_A_GATE,
 669                                    NFC_HCI_EVT_END_OPERATION, NULL, 0);
 670
 671         return r;
 672 }
 673
 674 static int pn544_hci_target_from_gate(struct nfc_shdlc *shdlc, u8 gate,
 675                                       struct nfc_target *target)
 676 {
 677         switch (gate) {
 678         case PN544_RF_READER_F_GATE:
 679                 target->supported_protocols = NFC_PROTO_FELICA_MASK;
 680                 break;
 681         case PN544_RF_READER_JEWEL_GATE:
 682                 target->supported_protocols = NFC_PROTO_JEWEL_MASK;
 683                 target->sens_res = 0x0c00;
 684                 break;
 685         default:
 686                 return -EPROTO;
 687         }
 688
 689         return 0;
 690 }
 691
 692 static int pn544_hci_complete_target_discovered(struct nfc_shdlc *shdlc,
 693                                                 u8 gate,
 694                                                 struct nfc_target *target)
 695 {
 696         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 697         struct sk_buff *uid_skb;
 698         int r = 0;
 699
 700         if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 701                 if (target->nfcid1_len != 4 && target->nfcid1_len != 7 &&
 702                     target->nfcid1_len != 10)
 703                         return -EPROTO;
 704
 705                 r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 706                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 707                                      target->nfcid1, target->nfcid1_len, NULL);
 708         } else if (target->supported_protocols & NFC_PROTO_FELICA_MASK) {
 709                 r = nfc_hci_get_param(hdev, PN544_RF_READER_F_GATE,
 710                                       PN544_FELICA_ID, &uid_skb);
 711                 if (r < 0)
 712                         return r;
 713
 714                 if (uid_skb->len != 8) {
 715                         kfree_skb(uid_skb);
 716                         return -EPROTO;
 717                 }
 718
 719                 r = nfc_hci_send_cmd(hdev, PN544_RF_READER_F_GATE,
 720                                      PN544_RF_READER_CMD_ACTIVATE_NEXT,
 721                                      uid_skb->data, uid_skb->len, NULL);
 722                 kfree_skb(uid_skb);
 723         } else if (target->supported_protocols & NFC_PROTO_ISO14443_MASK) {
 724                 /*
 725                  * TODO: maybe other ISO 14443 require some kind of continue
 726                  * activation, but for now we've seen only this one below.
 727                  */
 728                 if (target->sens_res == 0x4403) /* Type 4 Mifare DESFire */
 729                         r = nfc_hci_send_cmd(hdev, NFC_HCI_RF_READER_A_GATE,
 730                               PN544_RF_READER_A_CMD_CONTINUE_ACTIVATION,
 731                               NULL, 0, NULL);
 732         }
 733
 734         return r;
 735 }
 736
 737 #define PN544_CB_TYPE_READER_F 1
 738
 739 static void pn544_hci_data_exchange_cb(void *context, struct sk_buff *skb,
 740                                        int err)
 741 {
 742         struct pn544_hci_info *info = context;
 743
 744         switch (info->async_cb_type) {
 745         case PN544_CB_TYPE_READER_F:
 746                 if (err == 0)
 747                         skb_pull(skb, 1);
 748                 info->async_cb(info->async_cb_context, skb, err);
 749                 break;
 750         default:
 751                 if (err == 0)
 752                         kfree_skb(skb);
 753                 break;
 754         }
 755 }
 756
 757 #define MIFARE_CMD_AUTH_KEY_A   0x60
 758 #define MIFARE_CMD_AUTH_KEY_B   0x61
 759 #define MIFARE_CMD_HEADER       2
 760 #define MIFARE_UID_LEN          4
 761 #define MIFARE_KEY_LEN          6
 762 #define MIFARE_CMD_LEN          12
 763 /*
 764  * Returns:
 765  * <= 0: driver handled the data exchange
 766  *    1: driver doesn't especially handle, please do standard processing
 767  */
 768 static int pn544_hci_data_exchange(struct nfc_shdlc *shdlc,
 769                                    struct nfc_target *target,
 770                                    struct sk_buff *skb, data_exchange_cb_t cb,
 771                                    void *cb_context)
 772 {
 773         struct pn544_hci_info *info = nfc_shdlc_get_clientdata(shdlc);
 774         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 775
 776         pr_info(DRIVER_DESC ": %s for gate=%d\n", __func__,
 777                 target->hci_reader_gate);
 778
 779         switch (target->hci_reader_gate) {
 780         case NFC_HCI_RF_READER_A_GATE:
 781                 if (target->supported_protocols & NFC_PROTO_MIFARE_MASK) {
 782                         /*
 783                          * It seems that pn544 is inverting key and UID for
 784                          * MIFARE authentication commands.
 785                          */
 786                         if (skb->len == MIFARE_CMD_LEN &&
 787                             (skb->data[0] == MIFARE_CMD_AUTH_KEY_A ||
 788                              skb->data[0] == MIFARE_CMD_AUTH_KEY_B)) {
 789                                 u8 uid[MIFARE_UID_LEN];
 790                                 u8 *data = skb->data + MIFARE_CMD_HEADER;
 791
 792                                 memcpy(uid, data + MIFARE_KEY_LEN,
 793                                        MIFARE_UID_LEN);
 794                                 memmove(data + MIFARE_UID_LEN, data,
 795                                         MIFARE_KEY_LEN);
 796                                 memcpy(data, uid, MIFARE_UID_LEN);
 797                         }
 798
 799                         return nfc_hci_send_cmd_async(hdev,
 800                                                       target->hci_reader_gate,
 801                                                       PN544_MIFARE_CMD,
 802                                                       skb->data, skb->len,
 803                                                       cb, cb_context);
 804                 } else
 805                         return 1;
 806         case PN544_RF_READER_F_GATE:
 807                 *skb_push(skb, 1) = 0;
 808                 *skb_push(skb, 1) = 0;
 809
 810                 info->async_cb_type = PN544_CB_TYPE_READER_F;
 811                 info->async_cb = cb;
 812                 info->async_cb_context = cb_context;
 813
 814                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 815                                               PN544_FELICA_RAW, skb->data,
 816                                               skb->len,
 817                                               pn544_hci_data_exchange_cb, info);
 818         case PN544_RF_READER_JEWEL_GATE:
 819                 return nfc_hci_send_cmd_async(hdev, target->hci_reader_gate,
 820                                               PN544_JEWEL_RAW_CMD, skb->data,
 821                                               skb->len, cb, cb_context);
 822         default:
 823                 return 1;
 824         }
 825 }
 826
 827 static int pn544_hci_check_presence(struct nfc_shdlc *shdlc,
 828                                    struct nfc_target *target)
 829 {
 830         struct nfc_hci_dev *hdev = nfc_shdlc_get_hci_dev(shdlc);
 831
 832         return nfc_hci_send_cmd(hdev, target->hci_reader_gate,
 833                                 PN544_RF_READER_CMD_PRESENCE_CHECK,
 834                                 NULL, 0, NULL);
 835 }
 836
 837 static struct nfc_shdlc_ops pn544_shdlc_ops = {
 838         .open = pn544_hci_open,
 839         .close = pn544_hci_close,
 840         .hci_ready = pn544_hci_ready,
 841         .xmit = pn544_hci_xmit,
 842         .start_poll = pn544_hci_start_poll,
 843         .target_from_gate = pn544_hci_target_from_gate,
 844         .complete_target_discovered = pn544_hci_complete_target_discovered,
 845         .data_exchange = pn544_hci_data_exchange,
 846         .check_presence = pn544_hci_check_presence,
 847 };
 848
 849 static int __devinit pn544_hci_probe(struct i2c_client *client,
 850                                      const struct i2c_device_id *id)
 851 {
 852         struct pn544_hci_info *info;
 853         struct pn544_nfc_platform_data *pdata;
 854         int r = 0;
 855         u32 protocols;
 856         struct nfc_hci_init_data init_data;
 857
 858         dev_dbg(&client->dev, "%s\n", __func__);
 859         dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
 860
 861         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 862                 dev_err(&client->dev, "Need I2C_FUNC_I2C\n");
 863                 return -ENODEV;
 864         }
 865
 866         info = kzalloc(sizeof(struct pn544_hci_info), GFP_KERNEL);
 867         if (!info) {
 868                 dev_err(&client->dev,
 869                         "Cannot allocate memory for pn544_hci_info.\n");
 870                 r = -ENOMEM;
 871                 goto err_info_alloc;
 872         }
 873
 874         info->i2c_dev = client;
 875         info->state = PN544_ST_COLD;
 876         mutex_init(&info->info_lock);
 877         i2c_set_clientdata(client, info);
 878
 879         pdata = client->dev.platform_data;
 880         if (pdata == NULL) {
 881                 dev_err(&client->dev, "No platform data\n");
 882                 r = -EINVAL;
 883                 goto err_pdata;
 884         }
 885
 886         if (pdata->request_resources == NULL) {
 887                 dev_err(&client->dev, "request_resources() missing\n");
 888                 r = -EINVAL;
 889                 goto err_pdata;
 890         }
 891
 892         r = pdata->request_resources(client);
 893         if (r) {
 894                 dev_err(&client->dev, "Cannot get platform resources\n");
 895                 goto err_pdata;
 896         }
 897
 898         info->gpio_en = pdata->get_gpio(NFC_GPIO_ENABLE);
 899         info->gpio_fw = pdata->get_gpio(NFC_GPIO_FW_RESET);
 900         info->gpio_irq = pdata->get_gpio(NFC_GPIO_IRQ);
 901
 902         pn544_hci_platform_init(info);
 903
 904         r = request_threaded_irq(client->irq, NULL, pn544_hci_irq_thread_fn,
 905                                  IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 906                                  PN544_HCI_DRIVER_NAME, info);
 907         if (r < 0) {
 908                 dev_err(&client->dev, "Unable to register IRQ handler\n");
 909                 goto err_rti;
 910         }
 911
 912         init_data.gate_count = ARRAY_SIZE(pn544_gates);
 913
 914         memcpy(init_data.gates, pn544_gates, sizeof(pn544_gates));
 915
 916         /*
 917          * TODO: Session id must include the driver name + some bus addr
 918          * persistent info to discriminate 2 identical chips
 919          */
 920         strcpy(init_data.session_id, "ID544HCI");
 921
 922         protocols = NFC_PROTO_JEWEL_MASK |
 923                     NFC_PROTO_MIFARE_MASK |
 924                     NFC_PROTO_FELICA_MASK |
 925                     NFC_PROTO_ISO14443_MASK |
 926                     NFC_PROTO_ISO14443_B_MASK |
 927                     NFC_PROTO_NFC_DEP_MASK;
 928
 929         info->shdlc = nfc_shdlc_allocate(&pn544_shdlc_ops,
 930                                          &init_data, protocols,
 931                                          PN544_FRAME_HEADROOM + PN544_CMDS_HEADROOM,
 932                                          PN544_FRAME_TAILROOM,
 933                                          PN544_HCI_LLC_MAX_PAYLOAD,
 934                                          dev_name(&client->dev));
 935         if (!info->shdlc) {
 936                 dev_err(&client->dev, "Cannot allocate nfc shdlc.\n");
 937                 r = -ENOMEM;
 938                 goto err_allocshdlc;
 939         }
 940
 941         nfc_shdlc_set_clientdata(info->shdlc, info);
 942
 943         return 0;
 944
 945 err_allocshdlc:
 946         free_irq(client->irq, info);
 947
 948 err_rti:
 949         if (pdata->free_resources != NULL)
 950                 pdata->free_resources();
 951
 952 err_pdata:
 953         kfree(info);
 954
 955 err_info_alloc:
 956         return r;
 957 }
 958
 959 static __devexit int pn544_hci_remove(struct i2c_client *client)
 960 {
 961         struct pn544_hci_info *info = i2c_get_clientdata(client);
 962         struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
 963
 964         dev_dbg(&client->dev, "%s\n", __func__);
 965
 966         nfc_shdlc_free(info->shdlc);
 967
 968         if (info->state != PN544_ST_COLD) {
 969                 if (pdata->disable)
 970                         pdata->disable();
 971         }
 972
 973         free_irq(client->irq, info);
 974         if (pdata->free_resources)
 975                 pdata->free_resources();
 976
 977         kfree(info);
 978
 979         return 0;
 980 }
 981
 982 static struct i2c_driver pn544_hci_driver = {
 983         .driver = {
 984                    .name = PN544_HCI_DRIVER_NAME,
 985                   },
 986         .probe = pn544_hci_probe,
 987         .id_table = pn544_hci_id_table,
 988         .remove = __devexit_p(pn544_hci_remove),
 989 };
 990
 991 static int __init pn544_hci_init(void)
 992 {
 993         int r;
 994
 995         pr_debug(DRIVER_DESC ": %s\n", __func__);
 996
 997         r = i2c_add_driver(&pn544_hci_driver);
 998         if (r) {
 999                 pr_err(PN544_HCI_DRIVER_NAME ": driver registration failed\n");
1000                 return r;
1001         }
1002
1003         return 0;
1004 }
1005
1006 static void __exit pn544_hci_exit(void)
1007 {
1008         i2c_del_driver(&pn544_hci_driver);
1009 }
1010
1011 module_init(pn544_hci_init);
1012 module_exit(pn544_hci_exit);
1013
1014 MODULE_LICENSE("GPL");
1015 MODULE_DESCRIPTION(DRIVER_DESC);