drivers/nfc/pn544.c

   1 /*
   2  * Driver for the PN544 NFC chip.
   3  *
   4  * Copyright (C) Nokia Corporation
   5  *
   6  * Author: Jari Vanhala <ext-jari.vanhala@nokia.com>
   7  * Contact: Matti Aaltonen <matti.j.aaltonen@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #include <linux/completion.h>
  24 #include <linux/crc-ccitt.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/kernel.h>
  28 #include <linux/miscdevice.h>
  29 #include <linux/module.h>
  30 #include <linux/mutex.h>
  31 #include <linux/nfc/pn544.h>
  32 #include <linux/poll.h>
  33 #include <linux/regulator/consumer.h>
  34 #include <linux/serial_core.h> /* for TCGETS */
  35 #include <linux/slab.h>
  36
  37 #define DRIVER_CARD     "PN544 NFC"
  38 #define DRIVER_DESC     "NFC driver for PN544"
  39
  40 static struct i2c_device_id pn544_id_table[] = {
  41         { PN544_DRIVER_NAME, 0 },
  42         { }
  43 };
  44 MODULE_DEVICE_TABLE(i2c, pn544_id_table);
  45
  46 #define HCI_MODE        0
  47 #define FW_MODE         1
  48
  49 enum pn544_state {
  50         PN544_ST_COLD,
  51         PN544_ST_FW_READY,
  52         PN544_ST_READY,
  53 };
  54
  55 enum pn544_irq {
  56         PN544_NONE,
  57         PN544_INT,
  58 };
  59
  60 struct pn544_info {
  61         struct miscdevice miscdev;
  62         struct i2c_client *i2c_dev;
  63         struct regulator_bulk_data regs[2];
  64
  65         enum pn544_state state;
  66         wait_queue_head_t read_wait;
  67         loff_t read_offset;
  68         enum pn544_irq read_irq;
  69         struct mutex read_mutex; /* Serialize read_irq access */
  70         struct mutex mutex; /* Serialize info struct access */
  71         u8 *buf;
  72         unsigned int buflen;
  73 };
  74
  75 static const char reg_vdd_io[]  = "Vdd_IO";
  76 static const char reg_vbat[]    = "VBat";
  77
  78 /* sysfs interface */
  79 static ssize_t pn544_test(struct device *dev,
  80                           struct device_attribute *attr, char *buf)
  81 {
  82         struct pn544_info *info = dev_get_drvdata(dev);
  83         struct i2c_client *client = info->i2c_dev;
  84         struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
  85
  86         return snprintf(buf, PAGE_SIZE, "%d\n", pdata->test());
  87 }
  88
  89 static int pn544_enable(struct pn544_info *info, int mode)
  90 {
  91         struct pn544_nfc_platform_data *pdata;
  92         struct i2c_client *client = info->i2c_dev;
  93
  94         int r;
  95
  96         r = regulator_bulk_enable(ARRAY_SIZE(info->regs), info->regs);
  97         if (r < 0)
  98                 return r;
  99
 100         pdata = client->dev.platform_data;
 101         info->read_irq = PN544_NONE;
 102         if (pdata->enable)
 103                 pdata->enable(mode);
 104
 105         if (mode) {
 106                 info->state = PN544_ST_FW_READY;
 107                 dev_dbg(&client->dev, "now in FW-mode\n");
 108         } else {
 109                 info->state = PN544_ST_READY;
 110                 dev_dbg(&client->dev, "now in HCI-mode\n");
 111         }
 112
 113         usleep_range(10000, 15000);
 114
 115         return 0;
 116 }
 117
 118 static void pn544_disable(struct pn544_info *info)
 119 {
 120         struct pn544_nfc_platform_data *pdata;
 121         struct i2c_client *client = info->i2c_dev;
 122
 123         pdata = client->dev.platform_data;
 124         if (pdata->disable)
 125                 pdata->disable();
 126
 127         info->state = PN544_ST_COLD;
 128
 129         dev_dbg(&client->dev, "Now in OFF-mode\n");
 130
 131         msleep(PN544_RESETVEN_TIME);
 132
 133         info->read_irq = PN544_NONE;
 134         regulator_bulk_disable(ARRAY_SIZE(info->regs), info->regs);
 135 }
 136
 137 static int check_crc(u8 *buf, int buflen)
 138 {
 139         u8 len;
 140         u16 crc;
 141
 142         len = buf[0] + 1;
 143         if (len < 4 || len != buflen || len > PN544_MSG_MAX_SIZE) {
 144                 pr_err(PN544_DRIVER_NAME
 145                        ": CRC; corrupt packet len %u (%d)\n", len, buflen);
 146                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
 147                                16, 2, buf, buflen, false);
 148                 return -EPERM;
 149         }
 150         crc = crc_ccitt(0xffff, buf, len - 2);
 151         crc = ~crc;
 152
 153         if (buf[len-2] != (crc & 0xff) || buf[len-1] != (crc >> 8)) {
 154                 pr_err(PN544_DRIVER_NAME ": CRC error 0x%x != 0x%x 0x%x\n",
 155                        crc, buf[len-1], buf[len-2]);
 156
 157                 print_hex_dump(KERN_DEBUG, "crc: ", DUMP_PREFIX_NONE,
 158                                16, 2, buf, buflen, false);
 159                 return -EPERM;
 160         }
 161         return 0;
 162 }
 163
 164 static int pn544_i2c_write(struct i2c_client *client, u8 *buf, int len)
 165 {
 166         int r;
 167
 168         if (len < 4 || len != (buf[0] + 1)) {
 169                 dev_err(&client->dev, "%s: Illegal message length: %d\n",
 170                         __func__, len);
 171                 return -EINVAL;
 172         }
 173
 174         if (check_crc(buf, len))
 175                 return -EINVAL;
 176
 177         usleep_range(3000, 6000);
 178
 179         r = i2c_master_send(client, buf, len);
 180         dev_dbg(&client->dev, "send: %d\n", r);
 181
 182         if (r == -EREMOTEIO) { /* Retry, chip was in standby */
 183                 usleep_range(6000, 10000);
 184                 r = i2c_master_send(client, buf, len);
 185                 dev_dbg(&client->dev, "send2: %d\n", r);
 186         }
 187
 188         if (r != len)
 189                 return -EREMOTEIO;
 190
 191         return r;
 192 }
 193
 194 static int pn544_i2c_read(struct i2c_client *client, u8 *buf, int buflen)
 195 {
 196         int r;
 197         u8 len;
 198
 199         /*
 200          * You could read a packet in one go, but then you'd need to read
 201          * max size and rest would be 0xff fill, so we do split reads.
 202          */
 203         r = i2c_master_recv(client, &len, 1);
 204         dev_dbg(&client->dev, "recv1: %d\n", r);
 205
 206         if (r != 1)
 207                 return -EREMOTEIO;
 208
 209         if (len < PN544_LLC_HCI_OVERHEAD)
 210                 len = PN544_LLC_HCI_OVERHEAD;
 211         else if (len > (PN544_MSG_MAX_SIZE - 1))
 212                 len = PN544_MSG_MAX_SIZE - 1;
 213
 214         if (1 + len > buflen) /* len+(data+crc16) */
 215                 return -EMSGSIZE;
 216
 217         buf[0] = len;
 218
 219         r = i2c_master_recv(client, buf + 1, len);
 220         dev_dbg(&client->dev, "recv2: %d\n", r);
 221
 222         if (r != len)
 223                 return -EREMOTEIO;
 224
 225         usleep_range(3000, 6000);
 226
 227         return r + 1;
 228 }
 229
 230 static int pn544_fw_write(struct i2c_client *client, u8 *buf, int len)
 231 {
 232         int r;
 233
 234         dev_dbg(&client->dev, "%s\n", __func__);
 235
 236         if (len < PN544_FW_HEADER_SIZE ||
 237             (PN544_FW_HEADER_SIZE + (buf[1] << 8) + buf[2]) != len)
 238                 return -EINVAL;
 239
 240         r = i2c_master_send(client, buf, len);
 241         dev_dbg(&client->dev, "fw send: %d\n", r);
 242
 243         if (r == -EREMOTEIO) { /* Retry, chip was in standby */
 244                 usleep_range(6000, 10000);
 245                 r = i2c_master_send(client, buf, len);
 246                 dev_dbg(&client->dev, "fw send2: %d\n", r);
 247         }
 248
 249         if (r != len)
 250                 return -EREMOTEIO;
 251
 252         return r;
 253 }
 254
 255 static int pn544_fw_read(struct i2c_client *client, u8 *buf, int buflen)
 256 {
 257         int r, len;
 258
 259         if (buflen < PN544_FW_HEADER_SIZE)
 260                 return -EINVAL;
 261
 262         r = i2c_master_recv(client, buf, PN544_FW_HEADER_SIZE);
 263         dev_dbg(&client->dev, "FW recv1: %d\n", r);
 264
 265         if (r < 0)
 266                 return r;
 267
 268         if (r < PN544_FW_HEADER_SIZE)
 269                 return -EINVAL;
 270
 271         len = (buf[1] << 8) + buf[2];
 272         if (len == 0) /* just header, no additional data */
 273                 return r;
 274
 275         if (len > buflen - PN544_FW_HEADER_SIZE)
 276                 return -EMSGSIZE;
 277
 278         r = i2c_master_recv(client, buf + PN544_FW_HEADER_SIZE, len);
 279         dev_dbg(&client->dev, "fw recv2: %d\n", r);
 280
 281         if (r != len)
 282                 return -EINVAL;
 283
 284         return r + PN544_FW_HEADER_SIZE;
 285 }
 286
 287 static irqreturn_t pn544_irq_thread_fn(int irq, void *dev_id)
 288 {
 289         struct pn544_info *info = dev_id;
 290         struct i2c_client *client = info->i2c_dev;
 291
 292         BUG_ON(!info);
 293         BUG_ON(irq != info->i2c_dev->irq);
 294
 295         dev_dbg(&client->dev, "IRQ\n");
 296
 297         mutex_lock(&info->read_mutex);
 298         info->read_irq = PN544_INT;
 299         mutex_unlock(&info->read_mutex);
 300
 301         wake_up_interruptible(&info->read_wait);
 302
 303         return IRQ_HANDLED;
 304 }
 305
 306 static enum pn544_irq pn544_irq_state(struct pn544_info *info)
 307 {
 308         enum pn544_irq irq;
 309
 310         mutex_lock(&info->read_mutex);
 311         irq = info->read_irq;
 312         mutex_unlock(&info->read_mutex);
 313         /*
 314          * XXX: should we check GPIO-line status directly?
 315          * return pdata->irq_status() ? PN544_INT : PN544_NONE;
 316          */
 317
 318         return irq;
 319 }
 320
 321 static ssize_t pn544_read(struct file *file, char __user *buf,
 322                           size_t count, loff_t *offset)
 323 {
 324         struct pn544_info *info = container_of(file->private_data,
 325                                                struct pn544_info, miscdev);
 326         struct i2c_client *client = info->i2c_dev;
 327         enum pn544_irq irq;
 328         size_t len;
 329         int r = 0;
 330
 331         dev_dbg(&client->dev, "%s: info: %p, count: %zu\n", __func__,
 332                 info, count);
 333
 334         mutex_lock(&info->mutex);
 335
 336         if (info->state == PN544_ST_COLD) {
 337                 r = -ENODEV;
 338                 goto out;
 339         }
 340
 341         irq = pn544_irq_state(info);
 342         if (irq == PN544_NONE) {
 343                 if (file->f_flags & O_NONBLOCK) {
 344                         r = -EAGAIN;
 345                         goto out;
 346                 }
 347
 348                 if (wait_event_interruptible(info->read_wait,
 349                                              (info->read_irq == PN544_INT))) {
 350                         r = -ERESTARTSYS;
 351                         goto out;
 352                 }
 353         }
 354
 355         if (info->state == PN544_ST_FW_READY) {
 356                 len = min(count, info->buflen);
 357
 358                 mutex_lock(&info->read_mutex);
 359                 r = pn544_fw_read(info->i2c_dev, info->buf, len);
 360                 info->read_irq = PN544_NONE;
 361                 mutex_unlock(&info->read_mutex);
 362
 363                 if (r < 0) {
 364                         dev_err(&info->i2c_dev->dev, "FW read failed: %d\n", r);
 365                         goto out;
 366                 }
 367
 368                 print_hex_dump(KERN_DEBUG, "FW read: ", DUMP_PREFIX_NONE,
 369                                16, 2, info->buf, r, false);
 370
 371                 *offset += r;
 372                 if (copy_to_user(buf, info->buf, r)) {
 373                         r = -EFAULT;
 374                         goto out;
 375                 }
 376         } else {
 377                 len = min(count, info->buflen);
 378
 379                 mutex_lock(&info->read_mutex);
 380                 r = pn544_i2c_read(info->i2c_dev, info->buf, len);
 381                 info->read_irq = PN544_NONE;
 382                 mutex_unlock(&info->read_mutex);
 383
 384                 if (r < 0) {
 385                         dev_err(&info->i2c_dev->dev, "read failed (%d)\n", r);
 386                         goto out;
 387                 }
 388                 print_hex_dump(KERN_DEBUG, "read: ", DUMP_PREFIX_NONE,
 389                                16, 2, info->buf, r, false);
 390
 391                 *offset += r;
 392                 if (copy_to_user(buf, info->buf, r)) {
 393                         r = -EFAULT;
 394                         goto out;
 395                 }
 396         }
 397
 398 out:
 399         mutex_unlock(&info->mutex);
 400
 401         return r;
 402 }
 403
 404 static unsigned int pn544_poll(struct file *file, poll_table *wait)
 405 {
 406         struct pn544_info *info = container_of(file->private_data,
 407                                                struct pn544_info, miscdev);
 408         struct i2c_client *client = info->i2c_dev;
 409         int r = 0;
 410
 411         dev_dbg(&client->dev, "%s: info: %p\n", __func__, info);
 412
 413         mutex_lock(&info->mutex);
 414
 415         if (info->state == PN544_ST_COLD) {
 416                 r = -ENODEV;
 417                 goto out;
 418         }
 419
 420         poll_wait(file, &info->read_wait, wait);
 421
 422         if (pn544_irq_state(info) == PN544_INT) {
 423                 r = POLLIN | POLLRDNORM;
 424                 goto out;
 425         }
 426 out:
 427         mutex_unlock(&info->mutex);
 428
 429         return r;
 430 }
 431
 432 static ssize_t pn544_write(struct file *file, const char __user *buf,
 433                            size_t count, loff_t *ppos)
 434 {
 435         struct pn544_info *info = container_of(file->private_data,
 436                                                struct pn544_info, miscdev);
 437         struct i2c_client *client = info->i2c_dev;
 438         ssize_t len;
 439         int r;
 440
 441         dev_dbg(&client->dev, "%s: info: %p, count %zu\n", __func__,
 442                 info, count);
 443
 444         mutex_lock(&info->mutex);
 445
 446         if (info->state == PN544_ST_COLD) {
 447                 r = -ENODEV;
 448                 goto out;
 449         }
 450
 451         /*
 452          * XXX: should we detect rset-writes and clean possible
 453          * read_irq state
 454          */
 455         if (info->state == PN544_ST_FW_READY) {
 456                 size_t fw_len;
 457
 458                 if (count < PN544_FW_HEADER_SIZE) {
 459                         r = -EINVAL;
 460                         goto out;
 461                 }
 462
 463                 len = min(count, info->buflen);
 464                 if (copy_from_user(info->buf, buf, len)) {
 465                         r = -EFAULT;
 466                         goto out;
 467                 }
 468
 469                 print_hex_dump(KERN_DEBUG, "FW write: ", DUMP_PREFIX_NONE,
 470                                16, 2, info->buf, len, false);
 471
 472                 fw_len = PN544_FW_HEADER_SIZE + (info->buf[1] << 8) +
 473                         info->buf[2];
 474
 475                 if (len > fw_len) /* 1 msg at a time */
 476                         len = fw_len;
 477
 478                 r = pn544_fw_write(info->i2c_dev, info->buf, len);
 479         } else {
 480                 if (count < PN544_LLC_MIN_SIZE) {
 481                         r = -EINVAL;
 482                         goto out;
 483                 }
 484
 485                 len = min(count, info->buflen);
 486                 if (copy_from_user(info->buf, buf, len)) {
 487                         r = -EFAULT;
 488                         goto out;
 489                 }
 490
 491                 print_hex_dump(KERN_DEBUG, "write: ", DUMP_PREFIX_NONE,
 492                                16, 2, info->buf, len, false);
 493
 494                 if (len > (info->buf[0] + 1)) /* 1 msg at a time */
 495                         len  = info->buf[0] + 1;
 496
 497                 r = pn544_i2c_write(info->i2c_dev, info->buf, len);
 498         }
 499 out:
 500         mutex_unlock(&info->mutex);
 501
 502         return r;
 503
 504 }
 505
 506 static long pn544_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 507 {
 508         struct pn544_info *info = container_of(file->private_data,
 509                                                struct pn544_info, miscdev);
 510         struct i2c_client *client = info->i2c_dev;
 511         struct pn544_nfc_platform_data *pdata;
 512         unsigned int val;
 513         int r = 0;
 514
 515         dev_dbg(&client->dev, "%s: info: %p, cmd: 0x%x\n", __func__, info, cmd);
 516
 517         mutex_lock(&info->mutex);
 518
 519         if (info->state == PN544_ST_COLD) {
 520                 r = -ENODEV;
 521                 goto out;
 522         }
 523
 524         pdata = info->i2c_dev->dev.platform_data;
 525         switch (cmd) {
 526         case PN544_GET_FW_MODE:
 527                 dev_dbg(&client->dev, "%s:  PN544_GET_FW_MODE\n", __func__);
 528
 529                 val = (info->state == PN544_ST_FW_READY);
 530                 if (copy_to_user((void __user *)arg, &val, sizeof(val))) {
 531                         r = -EFAULT;
 532                         goto out;
 533                 }
 534
 535                 break;
 536
 537         case PN544_SET_FW_MODE:
 538                 dev_dbg(&client->dev, "%s:  PN544_SET_FW_MODE\n", __func__);
 539
 540                 if (copy_from_user(&val, (void __user *)arg, sizeof(val))) {
 541                         r = -EFAULT;
 542                         goto out;
 543                 }
 544
 545                 if (val) {
 546                         if (info->state == PN544_ST_FW_READY)
 547                                 break;
 548
 549                         pn544_disable(info);
 550                         r = pn544_enable(info, FW_MODE);
 551                         if (r < 0)
 552                                 goto out;
 553                 } else {
 554                         if (info->state == PN544_ST_READY)
 555                                 break;
 556                         pn544_disable(info);
 557                         r = pn544_enable(info, HCI_MODE);
 558                         if (r < 0)
 559                                 goto out;
 560                 }
 561                 file->f_pos = info->read_offset;
 562                 break;
 563
 564         case TCGETS:
 565                 dev_dbg(&client->dev, "%s:  TCGETS\n", __func__);
 566
 567                 r = -ENOIOCTLCMD;
 568                 break;
 569
 570         default:
 571                 dev_err(&client->dev, "Unknown ioctl 0x%x\n", cmd);
 572                 r = -ENOIOCTLCMD;
 573                 break;
 574         }
 575
 576 out:
 577         mutex_unlock(&info->mutex);
 578
 579         return r;
 580 }
 581
 582 static int pn544_open(struct inode *inode, struct file *file)
 583 {
 584         struct pn544_info *info = container_of(file->private_data,
 585                                                struct pn544_info, miscdev);
 586         struct i2c_client *client = info->i2c_dev;
 587         int r = 0;
 588
 589         dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
 590                 info, info->i2c_dev);
 591
 592         mutex_lock(&info->mutex);
 593
 594         /*
 595          * Only 1 at a time.
 596          * XXX: maybe user (counter) would work better
 597          */
 598         if (info->state != PN544_ST_COLD) {
 599                 r = -EBUSY;
 600                 goto out;
 601         }
 602
 603         file->f_pos = info->read_offset;
 604         r = pn544_enable(info, HCI_MODE);
 605
 606 out:
 607         mutex_unlock(&info->mutex);
 608         return r;
 609 }
 610
 611 static int pn544_close(struct inode *inode, struct file *file)
 612 {
 613         struct pn544_info *info = container_of(file->private_data,
 614                                                struct pn544_info, miscdev);
 615         struct i2c_client *client = info->i2c_dev;
 616
 617         dev_dbg(&client->dev, "%s: info: %p, client %p\n",
 618                 __func__, info, info->i2c_dev);
 619
 620         mutex_lock(&info->mutex);
 621         pn544_disable(info);
 622         mutex_unlock(&info->mutex);
 623
 624         return 0;
 625 }
 626
 627 static const struct file_operations pn544_fops = {
 628         .owner          = THIS_MODULE,
 629         .llseek         = no_llseek,
 630         .read           = pn544_read,
 631         .write          = pn544_write,
 632         .poll           = pn544_poll,
 633         .open           = pn544_open,
 634         .release        = pn544_close,
 635         .unlocked_ioctl = pn544_ioctl,
 636 };
 637
 638 #ifdef CONFIG_PM
 639 static int pn544_suspend(struct device *dev)
 640 {
 641         struct i2c_client *client = to_i2c_client(dev);
 642         struct pn544_info *info;
 643         int r = 0;
 644
 645         dev_info(&client->dev, "***\n%s: client %p\n***\n", __func__, client);
 646
 647         info = i2c_get_clientdata(client);
 648         dev_info(&client->dev, "%s: info: %p, client %p\n", __func__,
 649                  info, client);
 650
 651         mutex_lock(&info->mutex);
 652
 653         switch (info->state) {
 654         case PN544_ST_FW_READY:
 655                 /* Do not suspend while upgrading FW, please! */
 656                 r = -EPERM;
 657                 break;
 658
 659         case PN544_ST_READY:
 660                 /*
 661                  * CHECK: Device should be in standby-mode. No way to check?
 662                  * Allowing low power mode for the regulator is potentially
 663                  * dangerous if pn544 does not go to suspension.
 664                  */
 665                 break;
 666
 667         case PN544_ST_COLD:
 668                 break;
 669         };
 670
 671         mutex_unlock(&info->mutex);
 672         return r;
 673 }
 674
 675 static int pn544_resume(struct device *dev)
 676 {
 677         struct i2c_client *client = to_i2c_client(dev);
 678         struct pn544_info *info = i2c_get_clientdata(client);
 679         int r = 0;
 680
 681         dev_dbg(&client->dev, "%s: info: %p, client %p\n", __func__,
 682                 info, client);
 683
 684         mutex_lock(&info->mutex);
 685
 686         switch (info->state) {
 687         case PN544_ST_READY:
 688                 /*
 689                  * CHECK: If regulator low power mode is allowed in
 690                  * pn544_suspend, we should go back to normal mode
 691                  * here.
 692                  */
 693                 break;
 694
 695         case PN544_ST_COLD:
 696                 break;
 697
 698         case PN544_ST_FW_READY:
 699                 break;
 700         };
 701
 702         mutex_unlock(&info->mutex);
 703
 704         return r;
 705 }
 706
 707 static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
 708 #endif
 709
 710 static struct device_attribute pn544_attr =
 711         __ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
 712
 713 static int __devinit pn544_probe(struct i2c_client *client,
 714                                  const struct i2c_device_id *id)
 715 {
 716         struct pn544_info *info;
 717         struct pn544_nfc_platform_data *pdata;
 718         int r = 0;
 719
 720         dev_dbg(&client->dev, "%s\n", __func__);
 721         dev_dbg(&client->dev, "IRQ: %d\n", client->irq);
 722
 723         /* private data allocation */
 724         info = kzalloc(sizeof(struct pn544_info), GFP_KERNEL);
 725         if (!info) {
 726                 dev_err(&client->dev,
 727                         "Cannot allocate memory for pn544_info.\n");
 728                 r = -ENOMEM;
 729                 goto err_info_alloc;
 730         }
 731
 732         info->buflen = max(PN544_MSG_MAX_SIZE, PN544_MAX_I2C_TRANSFER);
 733         info->buf = kzalloc(info->buflen, GFP_KERNEL);
 734         if (!info->buf) {
 735                 dev_err(&client->dev,
 736                         "Cannot allocate memory for pn544_info->buf.\n");
 737                 r = -ENOMEM;
 738                 goto err_buf_alloc;
 739         }
 740
 741         info->regs[0].supply = reg_vdd_io;
 742         info->regs[1].supply = reg_vbat;
 743         r = regulator_bulk_get(&client->dev, ARRAY_SIZE(info->regs),
 744                                  info->regs);
 745         if (r < 0)
 746                 goto err_kmalloc;
 747
 748         info->i2c_dev = client;
 749         info->state = PN544_ST_COLD;
 750         info->read_irq = PN544_NONE;
 751         mutex_init(&info->read_mutex);
 752         mutex_init(&info->mutex);
 753         init_waitqueue_head(&info->read_wait);
 754         i2c_set_clientdata(client, info);
 755         pdata = client->dev.platform_data;
 756         if (!pdata) {
 757                 dev_err(&client->dev, "No platform data\n");
 758                 r = -EINVAL;
 759                 goto err_reg;
 760         }
 761
 762         if (!pdata->request_resources) {
 763                 dev_err(&client->dev, "request_resources() missing\n");
 764                 r = -EINVAL;
 765                 goto err_reg;
 766         }
 767
 768         r = pdata->request_resources(client);
 769         if (r) {
 770                 dev_err(&client->dev, "Cannot get platform resources\n");
 771                 goto err_reg;
 772         }
 773
 774         r = request_threaded_irq(client->irq, NULL, pn544_irq_thread_fn,
 775                                  IRQF_TRIGGER_RISING, PN544_DRIVER_NAME,
 776                                  info);
 777         if (r < 0) {
 778                 dev_err(&client->dev, "Unable to register IRQ handler\n");
 779                 goto err_res;
 780         }
 781
 782         /* If we don't have the test we don't need the sysfs file */
 783         if (pdata->test) {
 784                 r = device_create_file(&client->dev, &pn544_attr);
 785                 if (r) {
 786                         dev_err(&client->dev,
 787                                 "sysfs registration failed, error %d\n", r);
 788                         goto err_irq;
 789                 }
 790         }
 791
 792         info->miscdev.minor = MISC_DYNAMIC_MINOR;
 793         info->miscdev.name = PN544_DRIVER_NAME;
 794         info->miscdev.fops = &pn544_fops;
 795         info->miscdev.parent = &client->dev;
 796         r = misc_register(&info->miscdev);
 797         if (r < 0) {
 798                 dev_err(&client->dev, "Device registration failed\n");
 799                 goto err_sysfs;
 800         }
 801
 802         dev_dbg(&client->dev, "%s: info: %p, pdata %p, client %p\n",
 803                 __func__, info, pdata, client);
 804
 805         return 0;
 806
 807 err_sysfs:
 808         if (pdata->test)
 809                 device_remove_file(&client->dev, &pn544_attr);
 810 err_irq:
 811         free_irq(client->irq, info);
 812 err_res:
 813         if (pdata->free_resources)
 814                 pdata->free_resources();
 815 err_reg:
 816         regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
 817 err_kmalloc:
 818         kfree(info->buf);
 819 err_buf_alloc:
 820         kfree(info);
 821 err_info_alloc:
 822         return r;
 823 }
 824
 825 static __devexit int pn544_remove(struct i2c_client *client)
 826 {
 827         struct pn544_info *info = i2c_get_clientdata(client);
 828         struct pn544_nfc_platform_data *pdata = client->dev.platform_data;
 829
 830         dev_dbg(&client->dev, "%s\n", __func__);
 831
 832         misc_deregister(&info->miscdev);
 833         if (pdata->test)
 834                 device_remove_file(&client->dev, &pn544_attr);
 835
 836         if (info->state != PN544_ST_COLD) {
 837                 if (pdata->disable)
 838                         pdata->disable();
 839
 840                 info->read_irq = PN544_NONE;
 841         }
 842
 843         free_irq(client->irq, info);
 844         if (pdata->free_resources)
 845                 pdata->free_resources();
 846
 847         regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
 848         kfree(info->buf);
 849         kfree(info);
 850
 851         return 0;
 852 }
 853
 854 static struct i2c_driver pn544_driver = {
 855         .driver = {
 856                 .name = PN544_DRIVER_NAME,
 857 #ifdef CONFIG_PM
 858                 .pm = &pn544_pm_ops,
 859 #endif
 860         },
 861         .probe = pn544_probe,
 862         .id_table = pn544_id_table,
 863         .remove = __devexit_p(pn544_remove),
 864 };
 865
 866 static int __init pn544_init(void)
 867 {
 868         int r;
 869
 870         pr_debug(DRIVER_DESC ": %s\n", __func__);
 871
 872         r = i2c_add_driver(&pn544_driver);
 873         if (r) {
 874                 pr_err(PN544_DRIVER_NAME ": driver registration failed\n");
 875                 return r;
 876         }
 877
 878         return 0;
 879 }
 880
 881 static void __exit pn544_exit(void)
 882 {
 883         i2c_del_driver(&pn544_driver);
 884         pr_info(DRIVER_DESC ", Exiting.\n");
 885 }
 886
 887 module_init(pn544_init);
 888 module_exit(pn544_exit);
 889
 890 MODULE_LICENSE("GPL");
 891 MODULE_DESCRIPTION(DRIVER_DESC);