linux/drivers/nfc/pn544.c
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   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
  40static struct i2c_device_id pn544_id_table[] = {
  41        { PN544_DRIVER_NAME, 0 },
  42        { }
  43};
  44MODULE_DEVICE_TABLE(i2c, pn544_id_table);
  45
  46#define HCI_MODE        0
  47#define FW_MODE         1
  48
  49enum pn544_state {
  50        PN544_ST_COLD,
  51        PN544_ST_FW_READY,
  52        PN544_ST_READY,
  53};
  54
  55enum pn544_irq {
  56        PN544_NONE,
  57        PN544_INT,
  58};
  59
  60struct 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
  75static const char reg_vdd_io[]  = "Vdd_IO";
  76static const char reg_vbat[]    = "VBat";
  77static const char reg_vsim[]    = "VSim";
  78
  79/* sysfs interface */
  80static 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
  90static 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
 119static 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
 138static 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
 165static 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
 195static 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
 231static 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
 256static 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
 288static 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
 307static 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
 322static 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
 399out:
 400        mutex_unlock(&info->mutex);
 401
 402        return r;
 403}
 404
 405static 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        }
 427out:
 428        mutex_unlock(&info->mutex);
 429
 430        return r;
 431}
 432
 433static 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        }
 500out:
 501        mutex_unlock(&info->mutex);
 502
 503        return r;
 504
 505}
 506
 507static 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
 577out:
 578        mutex_unlock(&info->mutex);
 579
 580        return r;
 581}
 582
 583static 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
 607out:
 608        mutex_unlock(&info->mutex);
 609        return r;
 610}
 611
 612static 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
 628static 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
 640static 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
 676static 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
 708static SIMPLE_DEV_PM_OPS(pn544_pm_ops, pn544_suspend, pn544_resume);
 709#endif
 710
 711static struct device_attribute pn544_attr =
 712        __ATTR(nfc_test, S_IRUGO, pn544_test, NULL);
 713
 714static 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
 809err_sysfs:
 810        if (pdata->test)
 811                device_remove_file(&client->dev, &pn544_attr);
 812err_irq:
 813        free_irq(client->irq, info);
 814err_res:
 815        if (pdata->free_resources)
 816                pdata->free_resources();
 817err_reg:
 818        regulator_bulk_free(ARRAY_SIZE(info->regs), info->regs);
 819err_kmalloc:
 820        kfree(info->buf);
 821err_buf_alloc:
 822        kfree(info);
 823err_info_alloc:
 824        return r;
 825}
 826
 827static __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
 856static 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
 868static 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
 883static void __exit pn544_exit(void)
 884{
 885        i2c_del_driver(&pn544_driver);
 886        pr_info(DRIVER_DESC ", Exiting.\n");
 887}
 888
 889module_init(pn544_init);
 890module_exit(pn544_exit);
 891
 892MODULE_LICENSE("GPL");
 893MODULE_DESCRIPTION(DRIVER_DESC);
 894
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