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