pn533.c

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/*
 * Copyright (C) 2011 Instituto Nokia de Tecnologia
 *
 * Authors:
 *    Lauro Ramos Venancio <[email protected]>
 *    Aloisio Almeida Jr <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/nfc.h>
#include <linux/netdevice.h>
#include <net/nfc/nfc.h>

#define VERSION "0.1"

#define PN533_VENDOR_ID 0x4CC
#define PN533_PRODUCT_ID 0x2533

#define SCM_VENDOR_ID 0x4E6
#define SCL3711_PRODUCT_ID 0x5591

#define SONY_VENDOR_ID         0x054c
#define PASORI_PRODUCT_ID      0x02e1

#define PN533_QUIRKS_TYPE_A          BIT(0)
#define PN533_QUIRKS_TYPE_F          BIT(1)
#define PN533_QUIRKS_DEP             BIT(2)
#define PN533_QUIRKS_RAW_EXCHANGE    BIT(3)

#define PN533_DEVICE_STD    0x1
#define PN533_DEVICE_PASORI 0x2

#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
                 NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
                 NFC_PROTO_NFC_DEP_MASK |\
                 NFC_PROTO_ISO14443_B_MASK)

#define PN533_NO_TYPE_B_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \
                   NFC_PROTO_MIFARE_MASK | \
                   NFC_PROTO_FELICA_MASK | \
                   NFC_PROTO_ISO14443_MASK | \
                   NFC_PROTO_NFC_DEP_MASK)

static const struct usb_device_id pn533_table[] = {
    { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE,
      .idVendor     = PN533_VENDOR_ID,
      .idProduct        = PN533_PRODUCT_ID,
      .driver_info      = PN533_DEVICE_STD,
    },
    { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE,
      .idVendor     = SCM_VENDOR_ID,
      .idProduct        = SCL3711_PRODUCT_ID,
      .driver_info      = PN533_DEVICE_STD,
    },
    { .match_flags      = USB_DEVICE_ID_MATCH_DEVICE,
      .idVendor     = SONY_VENDOR_ID,
      .idProduct        = PASORI_PRODUCT_ID,
      .driver_info      = PN533_DEVICE_PASORI,
    },
    { }
};
MODULE_DEVICE_TABLE(usb, pn533_table);

/* How much time we spend listening for initiators */
#define PN533_LISTEN_TIME 2

/* frame definitions */
#define PN533_FRAME_TAIL_SIZE 2
#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
                PN533_FRAME_TAIL_SIZE)
#define PN533_FRAME_ACK_SIZE (sizeof(struct pn533_frame) + 1)
#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
#define PN533_FRAME_POSTAMBLE(f) (f->data[f->datalen + 1])

/* start of frame */
#define PN533_SOF 0x00FF

/* frame identifier: in/out/error */
#define PN533_FRAME_IDENTIFIER(f) (f->data[0])
#define PN533_DIR_OUT 0xD4
#define PN533_DIR_IN 0xD5

/* PN533 Commands */
#define PN533_FRAME_CMD(f) (f->data[1])
#define PN533_FRAME_CMD_PARAMS_PTR(f) (&f->data[2])
#define PN533_FRAME_CMD_PARAMS_LEN(f) (f->datalen - 2)

#define PN533_CMD_GET_FIRMWARE_VERSION 0x02
#define PN533_CMD_RF_CONFIGURATION 0x32
#define PN533_CMD_IN_DATA_EXCHANGE 0x40
#define PN533_CMD_IN_COMM_THRU     0x42
#define PN533_CMD_IN_LIST_PASSIVE_TARGET 0x4A
#define PN533_CMD_IN_ATR 0x50
#define PN533_CMD_IN_RELEASE 0x52
#define PN533_CMD_IN_JUMP_FOR_DEP 0x56

#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
#define PN533_CMD_TG_GET_DATA 0x86
#define PN533_CMD_TG_SET_DATA 0x8e

#define PN533_CMD_RESPONSE(cmd) (cmd + 1)

/* PN533 Return codes */
#define PN533_CMD_RET_MASK 0x3F
#define PN533_CMD_MI_MASK 0x40
#define PN533_CMD_RET_SUCCESS 0x00

/* PN533 status codes */
#define PN533_STATUS_TARGET_RELEASED 0x29

struct pn533;

typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg,
                    u8 *params, int params_len);

/* structs for pn533 commands */

/* PN533_CMD_GET_FIRMWARE_VERSION */
struct pn533_fw_version {
    u8 ic;
    u8 ver;
    u8 rev;
    u8 support;
};

/* PN533_CMD_RF_CONFIGURATION */
#define PN533_CFGITEM_TIMING 0x02
#define PN533_CFGITEM_MAX_RETRIES 0x05
#define PN533_CFGITEM_PASORI 0x82

#define PN533_CONFIG_TIMING_102 0xb
#define PN533_CONFIG_TIMING_204 0xc
#define PN533_CONFIG_TIMING_409 0xd
#define PN533_CONFIG_TIMING_819 0xe

#define PN533_CONFIG_MAX_RETRIES_NO_RETRY 0x00
#define PN533_CONFIG_MAX_RETRIES_ENDLESS 0xFF

struct pn533_config_max_retries {
    u8 mx_rty_atr;
    u8 mx_rty_psl;
    u8 mx_rty_passive_act;
} __packed;

struct pn533_config_timing {
    u8 rfu;
    u8 atr_res_timeout;
    u8 dep_timeout;
} __packed;

/* PN533_CMD_IN_LIST_PASSIVE_TARGET */

/* felica commands opcode */
#define PN533_FELICA_OPC_SENSF_REQ 0
#define PN533_FELICA_OPC_SENSF_RES 1
/* felica SENSF_REQ parameters */
#define PN533_FELICA_SENSF_SC_ALL 0xFFFF
#define PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE 0
#define PN533_FELICA_SENSF_RC_SYSTEM_CODE 1
#define PN533_FELICA_SENSF_RC_ADVANCED_PROTOCOL 2

/* type B initiator_data values */
#define PN533_TYPE_B_AFI_ALL_FAMILIES 0
#define PN533_TYPE_B_POLL_METHOD_TIMESLOT 0
#define PN533_TYPE_B_POLL_METHOD_PROBABILISTIC 1

union pn533_cmd_poll_initdata {
    struct {
        u8 afi;
        u8 polling_method;
    } __packed type_b;
    struct {
        u8 opcode;
        __be16 sc;
        u8 rc;
        u8 tsn;
    } __packed felica;
};

/* Poll modulations */
enum {
    PN533_POLL_MOD_106KBPS_A,
    PN533_POLL_MOD_212KBPS_FELICA,
    PN533_POLL_MOD_424KBPS_FELICA,
    PN533_POLL_MOD_106KBPS_JEWEL,
    PN533_POLL_MOD_847KBPS_B,
    PN533_LISTEN_MOD,

    __PN533_POLL_MOD_AFTER_LAST,
};
#define PN533_POLL_MOD_MAX (__PN533_POLL_MOD_AFTER_LAST - 1)

struct pn533_poll_modulations {
    struct {
        u8 maxtg;
        u8 brty;
        union pn533_cmd_poll_initdata initiator_data;
    } __packed data;
    u8 len;
};

const struct pn533_poll_modulations poll_mod[] = {
    [PN533_POLL_MOD_106KBPS_A] = {
        .data = {
            .maxtg = 1,
            .brty = 0,
        },
        .len = 2,
    },
    [PN533_POLL_MOD_212KBPS_FELICA] = {
        .data = {
            .maxtg = 1,
            .brty = 1,
            .initiator_data.felica = {
                .opcode = PN533_FELICA_OPC_SENSF_REQ,
                .sc = PN533_FELICA_SENSF_SC_ALL,
                .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
                .tsn = 0,
            },
        },
        .len = 7,
    },
    [PN533_POLL_MOD_424KBPS_FELICA] = {
        .data = {
            .maxtg = 1,
            .brty = 2,
            .initiator_data.felica = {
                .opcode = PN533_FELICA_OPC_SENSF_REQ,
                .sc = PN533_FELICA_SENSF_SC_ALL,
                .rc = PN533_FELICA_SENSF_RC_NO_SYSTEM_CODE,
                .tsn = 0,
            },
         },
        .len = 7,
    },
    [PN533_POLL_MOD_106KBPS_JEWEL] = {
        .data = {
            .maxtg = 1,
            .brty = 4,
        },
        .len = 2,
    },
    [PN533_POLL_MOD_847KBPS_B] = {
        .data = {
            .maxtg = 1,
            .brty = 8,
            .initiator_data.type_b = {
                .afi = PN533_TYPE_B_AFI_ALL_FAMILIES,
                .polling_method =
                    PN533_TYPE_B_POLL_METHOD_TIMESLOT,
            },
        },
        .len = 3,
    },
    [PN533_LISTEN_MOD] = {
        .len = 0,
    },
};

/* PN533_CMD_IN_ATR */

struct pn533_cmd_activate_param {
    u8 tg;
    u8 next;
} __packed;

struct pn533_cmd_activate_response {
    u8 status;
    u8 nfcid3t[10];
    u8 didt;
    u8 bst;
    u8 brt;
    u8 to;
    u8 ppt;
    /* optional */
    u8 gt[];
} __packed;

/* PN533_CMD_IN_JUMP_FOR_DEP */
struct pn533_cmd_jump_dep {
    u8 active;
    u8 baud;
    u8 next;
    u8 data[];
} __packed;

struct pn533_cmd_jump_dep_response {
    u8 status;
    u8 tg;
    u8 nfcid3t[10];
    u8 didt;
    u8 bst;
    u8 brt;
    u8 to;
    u8 ppt;
    /* optional */
    u8 gt[];
} __packed;


/* PN533_TG_INIT_AS_TARGET */
#define PN533_INIT_TARGET_PASSIVE 0x1
#define PN533_INIT_TARGET_DEP 0x2

#define PN533_INIT_TARGET_RESP_FRAME_MASK 0x3
#define PN533_INIT_TARGET_RESP_ACTIVE     0x1
#define PN533_INIT_TARGET_RESP_DEP        0x4

struct pn533_cmd_init_target {
    u8 mode;
    u8 mifare[6];
    u8 felica[18];
    u8 nfcid3[10];
    u8 gb_len;
    u8 gb[];
} __packed;

struct pn533_cmd_init_target_response {
    u8 mode;
    u8 cmd[];
} __packed;

struct pn533 {
    struct usb_device *udev;
    struct usb_interface *interface;
    struct nfc_dev *nfc_dev;

    struct urb *out_urb;
    int out_maxlen;
    struct pn533_frame *out_frame;

    struct urb *in_urb;
    int in_maxlen;
    struct pn533_frame *in_frame;

    struct sk_buff_head resp_q;

    struct workqueue_struct *wq;
    struct work_struct cmd_work;
    struct work_struct cmd_complete_work;
    struct work_struct poll_work;
    struct work_struct mi_work;
    struct work_struct tg_work;
    struct timer_list listen_timer;
    struct pn533_frame *wq_in_frame;
    int wq_in_error;
    int cancel_listen;

    pn533_cmd_complete_t cmd_complete;
    void *cmd_complete_arg;
    struct mutex cmd_lock;
    u8 cmd;

    struct pn533_poll_modulations *poll_mod_active[PN533_POLL_MOD_MAX + 1];
    u8 poll_mod_count;
    u8 poll_mod_curr;
    u32 poll_protocols;
    u32 listen_protocols;

    u8 *gb;
    size_t gb_len;

    u8 tgt_available_prots;
    u8 tgt_active_prot;
    u8 tgt_mode;

    u32 device_type;

    struct list_head cmd_queue;
    u8 cmd_pending;
};

struct pn533_cmd {
    struct list_head queue;
    struct pn533_frame *out_frame;
    struct pn533_frame *in_frame;
    int in_frame_len;
    pn533_cmd_complete_t cmd_complete;
    void *arg;
    gfp_t flags;
};

struct pn533_frame {
    u8 preamble;
    __be16 start_frame;
    u8 datalen;
    u8 datalen_checksum;
    u8 data[];
} __packed;

/* The rule: value + checksum = 0 */
static inline u8 pn533_checksum(u8 value)
{
    return ~value + 1;
}

/* The rule: sum(data elements) + checksum = 0 */
static u8 pn533_data_checksum(u8 *data, int datalen)
{
    u8 sum = 0;
    int i;

    for (i = 0; i < datalen; i++)
        sum += data[i];

    return pn533_checksum(sum);
}

static void pn533_tx_frame_ack(struct pn533_frame *frame)
{
    frame->preamble = 0;
    frame->start_frame = cpu_to_be16(PN533_SOF);
    frame->datalen = 0;
    frame->datalen_checksum = 0xFF;
    /* data[0] is used as postamble */
    frame->data[0] = 0;
}

static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
{
    frame->preamble = 0;
    frame->start_frame = cpu_to_be16(PN533_SOF);
    PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
    PN533_FRAME_CMD(frame) = cmd;
    frame->datalen = 2;
}

static void pn533_tx_frame_finish(struct pn533_frame *frame)
{
    frame->datalen_checksum = pn533_checksum(frame->datalen);

    PN533_FRAME_CHECKSUM(frame) =
        pn533_data_checksum(frame->data, frame->datalen);

    PN533_FRAME_POSTAMBLE(frame) = 0;
}

static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
{
    u8 checksum;

    if (frame->start_frame != cpu_to_be16(PN533_SOF))
        return false;

    checksum = pn533_checksum(frame->datalen);
    if (checksum != frame->datalen_checksum)
        return false;

    checksum = pn533_data_checksum(frame->data, frame->datalen);
    if (checksum != PN533_FRAME_CHECKSUM(frame))
        return false;

    return true;
}

static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
{
    if (frame->start_frame != cpu_to_be16(PN533_SOF))
        return false;

    if (frame->datalen != 0 || frame->datalen_checksum != 0xFF)
        return false;

    return true;
}

static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
{
    return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
}


static void pn533_wq_cmd_complete(struct work_struct *work)
{
    struct pn533 *dev = container_of(work, struct pn533, cmd_complete_work);
    struct pn533_frame *in_frame;
    int rc;

    in_frame = dev->wq_in_frame;

    if (dev->wq_in_error)
        rc = dev->cmd_complete(dev, dev->cmd_complete_arg, NULL,
                            dev->wq_in_error);
    else
        rc = dev->cmd_complete(dev, dev->cmd_complete_arg,
                    PN533_FRAME_CMD_PARAMS_PTR(in_frame),
                    PN533_FRAME_CMD_PARAMS_LEN(in_frame));

    if (rc != -EINPROGRESS)
        queue_work(dev->wq, &dev->cmd_work);
}

static void pn533_recv_response(struct urb *urb)
{
    struct pn533 *dev = urb->context;
    struct pn533_frame *in_frame;

    dev->wq_in_frame = NULL;

    switch (urb->status) {
    case 0:
        /* success */
        break;
    case -ECONNRESET:
    case -ENOENT:
    case -ESHUTDOWN:
        nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
                        " status: %d", urb->status);
        dev->wq_in_error = urb->status;
        goto sched_wq;
    default:
        nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
                            " %d", urb->status);
        dev->wq_in_error = urb->status;
        goto sched_wq;
    }

    in_frame = dev->in_urb->transfer_buffer;

    if (!pn533_rx_frame_is_valid(in_frame)) {
        nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
        dev->wq_in_error = -EIO;
        goto sched_wq;
    }

    if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
        nfc_dev_err(&dev->interface->dev, "The received frame is not "
                        "response to the last command");
        dev->wq_in_error = -EIO;
        goto sched_wq;
    }

    nfc_dev_dbg(&dev->interface->dev, "Received a valid frame");
    dev->wq_in_error = 0;
    dev->wq_in_frame = in_frame;

sched_wq:
    queue_work(dev->wq, &dev->cmd_complete_work);
}

static int pn533_submit_urb_for_response(struct pn533 *dev, gfp_t flags)
{
    dev->in_urb->complete = pn533_recv_response;

    return usb_submit_urb(dev->in_urb, flags);
}

static void pn533_recv_ack(struct urb *urb)
{
    struct pn533 *dev = urb->context;
    struct pn533_frame *in_frame;
    int rc;

    switch (urb->status) {
    case 0:
        /* success */
        break;
    case -ECONNRESET:
    case -ENOENT:
    case -ESHUTDOWN:
        nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
                        " status: %d", urb->status);
        dev->wq_in_error = urb->status;
        goto sched_wq;
    default:
        nfc_dev_err(&dev->interface->dev, "Nonzero urb status received:"
                            " %d", urb->status);
        dev->wq_in_error = urb->status;
        goto sched_wq;
    }

    in_frame = dev->in_urb->transfer_buffer;

    if (!pn533_rx_frame_is_ack(in_frame)) {
        nfc_dev_err(&dev->interface->dev, "Received an invalid ack");
        dev->wq_in_error = -EIO;
        goto sched_wq;
    }

    nfc_dev_dbg(&dev->interface->dev, "Received a valid ack");

    rc = pn533_submit_urb_for_response(dev, GFP_ATOMIC);
    if (rc) {
        nfc_dev_err(&dev->interface->dev, "usb_submit_urb failed with"
                            " result %d", rc);
        dev->wq_in_error = rc;
        goto sched_wq;
    }

    return;

sched_wq:
    dev->wq_in_frame = NULL;
    queue_work(dev->wq, &dev->cmd_complete_work);
}

static int pn533_submit_urb_for_ack(struct pn533 *dev, gfp_t flags)
{
    dev->in_urb->complete = pn533_recv_ack;

    return usb_submit_urb(dev->in_urb, flags);
}

static int pn533_send_ack(struct pn533 *dev, gfp_t flags)
{
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    pn533_tx_frame_ack(dev->out_frame);

    dev->out_urb->transfer_buffer = dev->out_frame;
    dev->out_urb->transfer_buffer_length = PN533_FRAME_ACK_SIZE;
    rc = usb_submit_urb(dev->out_urb, flags);

    return rc;
}

static int __pn533_send_cmd_frame_async(struct pn533 *dev,
                    struct pn533_frame *out_frame,
                    struct pn533_frame *in_frame,
                    int in_frame_len,
                    pn533_cmd_complete_t cmd_complete,
                    void *arg, gfp_t flags)
{
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "Sending command 0x%x",
                        PN533_FRAME_CMD(out_frame));

    dev->cmd = PN533_FRAME_CMD(out_frame);
    dev->cmd_complete = cmd_complete;
    dev->cmd_complete_arg = arg;

    dev->out_urb->transfer_buffer = out_frame;
    dev->out_urb->transfer_buffer_length =
                PN533_FRAME_SIZE(out_frame);

    dev->in_urb->transfer_buffer = in_frame;
    dev->in_urb->transfer_buffer_length = in_frame_len;

    rc = usb_submit_urb(dev->out_urb, flags);
    if (rc)
        return rc;

    rc = pn533_submit_urb_for_ack(dev, flags);
    if (rc)
        goto error;

    return 0;

error:
    usb_unlink_urb(dev->out_urb);
    return rc;
}

static void pn533_wq_cmd(struct work_struct *work)
{
    struct pn533 *dev = container_of(work, struct pn533, cmd_work);
    struct pn533_cmd *cmd;

    mutex_lock(&dev->cmd_lock);

    if (list_empty(&dev->cmd_queue)) {
        dev->cmd_pending = 0;
        mutex_unlock(&dev->cmd_lock);
        return;
    }

    cmd = list_first_entry(&dev->cmd_queue, struct pn533_cmd, queue);

    list_del(&cmd->queue);

    mutex_unlock(&dev->cmd_lock);

    __pn533_send_cmd_frame_async(dev, cmd->out_frame, cmd->in_frame,
                     cmd->in_frame_len, cmd->cmd_complete,
                     cmd->arg, cmd->flags);

    kfree(cmd);
}

static int pn533_send_cmd_frame_async(struct pn533 *dev,
                    struct pn533_frame *out_frame,
                    struct pn533_frame *in_frame,
                    int in_frame_len,
                    pn533_cmd_complete_t cmd_complete,
                    void *arg, gfp_t flags)
{
    struct pn533_cmd *cmd;
    int rc = 0;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    mutex_lock(&dev->cmd_lock);

    if (!dev->cmd_pending) {
        rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame,
                          in_frame_len, cmd_complete,
                          arg, flags);
        if (!rc)
            dev->cmd_pending = 1;

        goto unlock;
    }

    nfc_dev_dbg(&dev->interface->dev, "%s Queueing command", __func__);

    cmd = kzalloc(sizeof(struct pn533_cmd), flags);
    if (!cmd) {
        rc = -ENOMEM;
        goto unlock;
    }

    INIT_LIST_HEAD(&cmd->queue);
    cmd->out_frame = out_frame;
    cmd->in_frame = in_frame;
    cmd->in_frame_len = in_frame_len;
    cmd->cmd_complete = cmd_complete;
    cmd->arg = arg;
    cmd->flags = flags;

    list_add_tail(&cmd->queue, &dev->cmd_queue);

unlock:
    mutex_unlock(&dev->cmd_lock);

    return rc;
}

struct pn533_sync_cmd_response {
    int rc;
    struct completion done;
};

static int pn533_sync_cmd_complete(struct pn533 *dev, void *_arg,
                    u8 *params, int params_len)
{
    struct pn533_sync_cmd_response *arg = _arg;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    arg->rc = 0;

    if (params_len < 0) /* error */
        arg->rc = params_len;

    complete(&arg->done);

    return 0;
}

static int pn533_send_cmd_frame_sync(struct pn533 *dev,
                        struct pn533_frame *out_frame,
                        struct pn533_frame *in_frame,
                        int in_frame_len)
{
    int rc;
    struct pn533_sync_cmd_response arg;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    init_completion(&arg.done);

    rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, in_frame_len,
                pn533_sync_cmd_complete, &arg, GFP_KERNEL);
    if (rc)
        return rc;

    wait_for_completion(&arg.done);

    return arg.rc;
}

static void pn533_send_complete(struct urb *urb)
{
    struct pn533 *dev = urb->context;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    switch (urb->status) {
    case 0:
        /* success */
        break;
    case -ECONNRESET:
    case -ENOENT:
    case -ESHUTDOWN:
        nfc_dev_dbg(&dev->interface->dev, "Urb shutting down with"
                        " status: %d", urb->status);
        break;
    default:
        nfc_dev_dbg(&dev->interface->dev, "Nonzero urb status received:"
                            " %d", urb->status);
    }
}

struct pn533_target_type_a {
    __be16 sens_res;
    u8 sel_res;
    u8 nfcid_len;
    u8 nfcid_data[];
} __packed;


#define PN533_TYPE_A_SENS_RES_NFCID1(x) ((u8)((be16_to_cpu(x) & 0x00C0) >> 6))
#define PN533_TYPE_A_SENS_RES_SSD(x) ((u8)((be16_to_cpu(x) & 0x001F) >> 0))
#define PN533_TYPE_A_SENS_RES_PLATCONF(x) ((u8)((be16_to_cpu(x) & 0x0F00) >> 8))

#define PN533_TYPE_A_SENS_RES_SSD_JEWEL 0x00
#define PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL 0x0C

#define PN533_TYPE_A_SEL_PROT(x) (((x) & 0x60) >> 5)
#define PN533_TYPE_A_SEL_CASCADE(x) (((x) & 0x04) >> 2)

#define PN533_TYPE_A_SEL_PROT_MIFARE 0
#define PN533_TYPE_A_SEL_PROT_ISO14443 1
#define PN533_TYPE_A_SEL_PROT_DEP 2
#define PN533_TYPE_A_SEL_PROT_ISO14443_DEP 3

static bool pn533_target_type_a_is_valid(struct pn533_target_type_a *type_a,
                            int target_data_len)
{
    u8 ssd;
    u8 platconf;

    if (target_data_len < sizeof(struct pn533_target_type_a))
        return false;

    /* The lenght check of nfcid[] and ats[] are not being performed because
       the values are not being used */

    /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
    ssd = PN533_TYPE_A_SENS_RES_SSD(type_a->sens_res);
    platconf = PN533_TYPE_A_SENS_RES_PLATCONF(type_a->sens_res);

    if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
            platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
            (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
            platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
        return false;

    /* Requirements 4.8.2.1, 4.8.2.3, 4.8.2.5 and 4.8.2.7 from NFC Forum */
    if (PN533_TYPE_A_SEL_CASCADE(type_a->sel_res) != 0)
        return false;

    return true;
}

static int pn533_target_found_type_a(struct nfc_target *nfc_tgt, u8 *tgt_data,
                            int tgt_data_len)
{
    struct pn533_target_type_a *tgt_type_a;

    tgt_type_a = (struct pn533_target_type_a *) tgt_data;

    if (!pn533_target_type_a_is_valid(tgt_type_a, tgt_data_len))
        return -EPROTO;

    switch (PN533_TYPE_A_SEL_PROT(tgt_type_a->sel_res)) {
    case PN533_TYPE_A_SEL_PROT_MIFARE:
        nfc_tgt->supported_protocols = NFC_PROTO_MIFARE_MASK;
        break;
    case PN533_TYPE_A_SEL_PROT_ISO14443:
        nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK;
        break;
    case PN533_TYPE_A_SEL_PROT_DEP:
        nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
        break;
    case PN533_TYPE_A_SEL_PROT_ISO14443_DEP:
        nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_MASK |
                            NFC_PROTO_NFC_DEP_MASK;
        break;
    }

    nfc_tgt->sens_res = be16_to_cpu(tgt_type_a->sens_res);
    nfc_tgt->sel_res = tgt_type_a->sel_res;
    nfc_tgt->nfcid1_len = tgt_type_a->nfcid_len;
    memcpy(nfc_tgt->nfcid1, tgt_type_a->nfcid_data, nfc_tgt->nfcid1_len);

    return 0;
}

struct pn533_target_felica {
    u8 pol_res;
    u8 opcode;
    u8 nfcid2[8];
    u8 pad[8];
    /* optional */
    u8 syst_code[];
} __packed;

#define PN533_FELICA_SENSF_NFCID2_DEP_B1 0x01
#define PN533_FELICA_SENSF_NFCID2_DEP_B2 0xFE

static bool pn533_target_felica_is_valid(struct pn533_target_felica *felica,
                            int target_data_len)
{
    if (target_data_len < sizeof(struct pn533_target_felica))
        return false;

    if (felica->opcode != PN533_FELICA_OPC_SENSF_RES)
        return false;

    return true;
}

static int pn533_target_found_felica(struct nfc_target *nfc_tgt, u8 *tgt_data,
                            int tgt_data_len)
{
    struct pn533_target_felica *tgt_felica;

    tgt_felica = (struct pn533_target_felica *) tgt_data;

    if (!pn533_target_felica_is_valid(tgt_felica, tgt_data_len))
        return -EPROTO;

    if (tgt_felica->nfcid2[0] == PN533_FELICA_SENSF_NFCID2_DEP_B1 &&
                    tgt_felica->nfcid2[1] ==
                    PN533_FELICA_SENSF_NFCID2_DEP_B2)
        nfc_tgt->supported_protocols = NFC_PROTO_NFC_DEP_MASK;
    else
        nfc_tgt->supported_protocols = NFC_PROTO_FELICA_MASK;

    memcpy(nfc_tgt->sensf_res, &tgt_felica->opcode, 9);
    nfc_tgt->sensf_res_len = 9;

    return 0;
}

struct pn533_target_jewel {
    __be16 sens_res;
    u8 jewelid[4];
} __packed;

static bool pn533_target_jewel_is_valid(struct pn533_target_jewel *jewel,
                            int target_data_len)
{
    u8 ssd;
    u8 platconf;

    if (target_data_len < sizeof(struct pn533_target_jewel))
        return false;

    /* Requirement 4.6.3.3 from NFC Forum Digital Spec */
    ssd = PN533_TYPE_A_SENS_RES_SSD(jewel->sens_res);
    platconf = PN533_TYPE_A_SENS_RES_PLATCONF(jewel->sens_res);

    if ((ssd == PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
            platconf != PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL) ||
            (ssd != PN533_TYPE_A_SENS_RES_SSD_JEWEL &&
            platconf == PN533_TYPE_A_SENS_RES_PLATCONF_JEWEL))
        return false;

    return true;
}

static int pn533_target_found_jewel(struct nfc_target *nfc_tgt, u8 *tgt_data,
                            int tgt_data_len)
{
    struct pn533_target_jewel *tgt_jewel;

    tgt_jewel = (struct pn533_target_jewel *) tgt_data;

    if (!pn533_target_jewel_is_valid(tgt_jewel, tgt_data_len))
        return -EPROTO;

    nfc_tgt->supported_protocols = NFC_PROTO_JEWEL_MASK;
    nfc_tgt->sens_res = be16_to_cpu(tgt_jewel->sens_res);
    nfc_tgt->nfcid1_len = 4;
    memcpy(nfc_tgt->nfcid1, tgt_jewel->jewelid, nfc_tgt->nfcid1_len);

    return 0;
}

struct pn533_type_b_prot_info {
    u8 bitrate;
    u8 fsci_type;
    u8 fwi_adc_fo;
} __packed;

#define PN533_TYPE_B_PROT_FCSI(x) (((x) & 0xF0) >> 4)
#define PN533_TYPE_B_PROT_TYPE(x) (((x) & 0x0F) >> 0)
#define PN533_TYPE_B_PROT_TYPE_RFU_MASK 0x8

struct pn533_type_b_sens_res {
    u8 opcode;
    u8 nfcid[4];
    u8 appdata[4];
    struct pn533_type_b_prot_info prot_info;
} __packed;

#define PN533_TYPE_B_OPC_SENSB_RES 0x50

struct pn533_target_type_b {
    struct pn533_type_b_sens_res sensb_res;
    u8 attrib_res_len;
    u8 attrib_res[];
} __packed;

static bool pn533_target_type_b_is_valid(struct pn533_target_type_b *type_b,
                            int target_data_len)
{
    if (target_data_len < sizeof(struct pn533_target_type_b))
        return false;

    if (type_b->sensb_res.opcode != PN533_TYPE_B_OPC_SENSB_RES)
        return false;

    if (PN533_TYPE_B_PROT_TYPE(type_b->sensb_res.prot_info.fsci_type) &
                        PN533_TYPE_B_PROT_TYPE_RFU_MASK)
        return false;

    return true;
}

static int pn533_target_found_type_b(struct nfc_target *nfc_tgt, u8 *tgt_data,
                            int tgt_data_len)
{
    struct pn533_target_type_b *tgt_type_b;

    tgt_type_b = (struct pn533_target_type_b *) tgt_data;

    if (!pn533_target_type_b_is_valid(tgt_type_b, tgt_data_len))
        return -EPROTO;

    nfc_tgt->supported_protocols = NFC_PROTO_ISO14443_B_MASK;

    return 0;
}

struct pn533_poll_response {
    u8 nbtg;
    u8 tg;
    u8 target_data[];
} __packed;

static int pn533_target_found(struct pn533 *dev,
            struct pn533_poll_response *resp, int resp_len)
{
    int target_data_len;
    struct nfc_target nfc_tgt;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s - modulation=%d", __func__,
                            dev->poll_mod_curr);

    if (resp->tg != 1)
        return -EPROTO;

    memset(&nfc_tgt, 0, sizeof(struct nfc_target));

    target_data_len = resp_len - sizeof(struct pn533_poll_response);

    switch (dev->poll_mod_curr) {
    case PN533_POLL_MOD_106KBPS_A:
        rc = pn533_target_found_type_a(&nfc_tgt, resp->target_data,
                            target_data_len);
        break;
    case PN533_POLL_MOD_212KBPS_FELICA:
    case PN533_POLL_MOD_424KBPS_FELICA:
        rc = pn533_target_found_felica(&nfc_tgt, resp->target_data,
                            target_data_len);
        break;
    case PN533_POLL_MOD_106KBPS_JEWEL:
        rc = pn533_target_found_jewel(&nfc_tgt, resp->target_data,
                            target_data_len);
        break;
    case PN533_POLL_MOD_847KBPS_B:
        rc = pn533_target_found_type_b(&nfc_tgt, resp->target_data,
                            target_data_len);
        break;
    default:
        nfc_dev_err(&dev->interface->dev, "Unknown current poll"
                                " modulation");
        return -EPROTO;
    }

    if (rc)
        return rc;

    if (!(nfc_tgt.supported_protocols & dev->poll_protocols)) {
        nfc_dev_dbg(&dev->interface->dev, "The target found does not"
                        " have the desired protocol");
        return -EAGAIN;
    }

    nfc_dev_dbg(&dev->interface->dev, "Target found - supported protocols: "
                    "0x%x", nfc_tgt.supported_protocols);

    dev->tgt_available_prots = nfc_tgt.supported_protocols;

    nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);

    return 0;
}

static inline void pn533_poll_next_mod(struct pn533 *dev)
{
    dev->poll_mod_curr = (dev->poll_mod_curr + 1) % dev->poll_mod_count;
}

static void pn533_poll_reset_mod_list(struct pn533 *dev)
{
    dev->poll_mod_count = 0;
}

static void pn533_poll_add_mod(struct pn533 *dev, u8 mod_index)
{
    dev->poll_mod_active[dev->poll_mod_count] =
        (struct pn533_poll_modulations *) &poll_mod[mod_index];
    dev->poll_mod_count++;
}

static void pn533_poll_create_mod_list(struct pn533 *dev,
                       u32 im_protocols, u32 tm_protocols)
{
    pn533_poll_reset_mod_list(dev);

    if (im_protocols & NFC_PROTO_MIFARE_MASK
        || im_protocols & NFC_PROTO_ISO14443_MASK
        || im_protocols & NFC_PROTO_NFC_DEP_MASK)
        pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_A);

    if (im_protocols & NFC_PROTO_FELICA_MASK
        || im_protocols & NFC_PROTO_NFC_DEP_MASK) {
        pn533_poll_add_mod(dev, PN533_POLL_MOD_212KBPS_FELICA);
        pn533_poll_add_mod(dev, PN533_POLL_MOD_424KBPS_FELICA);
    }

    if (im_protocols & NFC_PROTO_JEWEL_MASK)
        pn533_poll_add_mod(dev, PN533_POLL_MOD_106KBPS_JEWEL);

    if (im_protocols & NFC_PROTO_ISO14443_B_MASK)
        pn533_poll_add_mod(dev, PN533_POLL_MOD_847KBPS_B);

    if (tm_protocols)
        pn533_poll_add_mod(dev, PN533_LISTEN_MOD);
}

static int pn533_start_poll_complete(struct pn533 *dev, void *arg,
                     u8 *params, int params_len)
{
    struct pn533_poll_response *resp;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    resp = (struct pn533_poll_response *) params;
    if (resp->nbtg) {
        rc = pn533_target_found(dev, resp, params_len);

        /* We must stop the poll after a valid target found */
        if (rc == 0) {
            pn533_poll_reset_mod_list(dev);
            return 0;
        }
    }

    return -EAGAIN;
}

static int pn533_init_target_frame(struct pn533_frame *frame,
                   u8 *gb, size_t gb_len)
{
    struct pn533_cmd_init_target *cmd;
    size_t cmd_len;
    u8 felica_params[18] = {0x1, 0xfe, /* DEP */
                0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
                0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
                0xff, 0xff}; /* System code */
    u8 mifare_params[6] = {0x1, 0x1, /* SENS_RES */
                   0x0, 0x0, 0x0,
                   0x40}; /* SEL_RES for DEP */

    cmd_len = sizeof(struct pn533_cmd_init_target) + gb_len + 1;
    cmd = kzalloc(cmd_len, GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    pn533_tx_frame_init(frame, PN533_CMD_TG_INIT_AS_TARGET);

    /* DEP support only */
    cmd->mode |= PN533_INIT_TARGET_DEP;

    /* Felica params */
    memcpy(cmd->felica, felica_params, 18);
    get_random_bytes(cmd->felica + 2, 6);

    /* NFCID3 */
    memset(cmd->nfcid3, 0, 10);
    memcpy(cmd->nfcid3, cmd->felica, 8);

    /* MIFARE params */
    memcpy(cmd->mifare, mifare_params, 6);

    /* General bytes */
    cmd->gb_len = gb_len;
    memcpy(cmd->gb, gb, gb_len);

    /* Len Tk */
    cmd->gb[gb_len] = 0;

    memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), cmd, cmd_len);

    frame->datalen += cmd_len;

    pn533_tx_frame_finish(frame);

    kfree(cmd);

    return 0;
}

#define PN533_CMD_DATAEXCH_HEAD_LEN (sizeof(struct pn533_frame) + 3)
#define PN533_CMD_DATAEXCH_DATA_MAXLEN 262
static int pn533_tm_get_data_complete(struct pn533 *dev, void *arg,
                      u8 *params, int params_len)
{
    struct sk_buff *skb_resp = arg;
    struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (params_len < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when starting as a target",
                params_len);

        return params_len;
    }

    if (params_len > 0 && params[0] != 0) {
        nfc_tm_deactivated(dev->nfc_dev);

        dev->tgt_mode = 0;

        kfree_skb(skb_resp);
        return 0;
    }

    skb_put(skb_resp, PN533_FRAME_SIZE(in_frame));
    skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN);
    skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE);

    return nfc_tm_data_received(dev->nfc_dev, skb_resp);
}

static void pn533_wq_tg_get_data(struct work_struct *work)
{
    struct pn533 *dev = container_of(work, struct pn533, tg_work);
    struct pn533_frame *in_frame;
    struct sk_buff *skb_resp;
    size_t skb_resp_len;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN +
        PN533_CMD_DATAEXCH_DATA_MAXLEN +
        PN533_FRAME_TAIL_SIZE;

    skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL);
    if (!skb_resp)
        return;

    in_frame = (struct pn533_frame *)skb_resp->data;

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_TG_GET_DATA);
    pn533_tx_frame_finish(dev->out_frame);

    pn533_send_cmd_frame_async(dev, dev->out_frame, in_frame,
                   skb_resp_len,
                   pn533_tm_get_data_complete,
                   skb_resp, GFP_KERNEL);

    return;
}

#define ATR_REQ_GB_OFFSET 17
static int pn533_init_target_complete(struct pn533 *dev, void *arg,
                      u8 *params, int params_len)
{
    struct pn533_cmd_init_target_response *resp;
    u8 frame, comm_mode = NFC_COMM_PASSIVE, *gb;
    size_t gb_len;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (params_len < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when starting as a target",
                params_len);

        return params_len;
    }

    if (params_len < ATR_REQ_GB_OFFSET + 1)
        return -EINVAL;

    resp = (struct pn533_cmd_init_target_response *) params;

    nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x param len %d\n",
            resp->mode, params_len);

    frame = resp->mode & PN533_INIT_TARGET_RESP_FRAME_MASK;
    if (frame == PN533_INIT_TARGET_RESP_ACTIVE)
        comm_mode = NFC_COMM_ACTIVE;

    /* Again, only DEP */
    if ((resp->mode & PN533_INIT_TARGET_RESP_DEP) == 0)
        return -EOPNOTSUPP;

    gb = resp->cmd + ATR_REQ_GB_OFFSET;
    gb_len = params_len - (ATR_REQ_GB_OFFSET + 1);

    rc = nfc_tm_activated(dev->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
                  comm_mode, gb, gb_len);
    if (rc < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error when signaling target activation");
        return rc;
    }

    dev->tgt_mode = 1;

    queue_work(dev->wq, &dev->tg_work);

    return 0;
}

static void pn533_listen_mode_timer(unsigned long data)
{
    struct pn533 *dev = (struct pn533 *) data;

    nfc_dev_dbg(&dev->interface->dev, "Listen mode timeout");

    /* An ack will cancel the last issued command (poll) */
    pn533_send_ack(dev, GFP_ATOMIC);

    dev->cancel_listen = 1;

    pn533_poll_next_mod(dev);

    queue_work(dev->wq, &dev->poll_work);
}

static int pn533_poll_complete(struct pn533 *dev, void *arg,
                   u8 *params, int params_len)
{
    struct pn533_poll_modulations *cur_mod;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (params_len == -ENOENT) {
        if (dev->poll_mod_count != 0)
            return 0;

        nfc_dev_err(&dev->interface->dev,
                "Polling operation has been stopped");

        goto stop_poll;
    }

    if (params_len < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when running poll", params_len);

        goto stop_poll;
    }

    cur_mod = dev->poll_mod_active[dev->poll_mod_curr];

    if (cur_mod->len == 0) {
        del_timer(&dev->listen_timer);

        return pn533_init_target_complete(dev, arg, params, params_len);
    } else {
        rc = pn533_start_poll_complete(dev, arg, params, params_len);
        if (!rc)
            return rc;
    }

    pn533_poll_next_mod(dev);

    queue_work(dev->wq, &dev->poll_work);

    return 0;

stop_poll:
    pn533_poll_reset_mod_list(dev);
    dev->poll_protocols = 0;
    return 0;
}

static void pn533_build_poll_frame(struct pn533 *dev,
                   struct pn533_frame *frame,
                   struct pn533_poll_modulations *mod)
{
    nfc_dev_dbg(&dev->interface->dev, "mod len %d\n", mod->len);

    if (mod->len == 0) {
        /* Listen mode */
        pn533_init_target_frame(frame, dev->gb, dev->gb_len);
    } else {
        /* Polling mode */
        pn533_tx_frame_init(frame, PN533_CMD_IN_LIST_PASSIVE_TARGET);

        memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), &mod->data, mod->len);
        frame->datalen += mod->len;

        pn533_tx_frame_finish(frame);
    }
}

static int pn533_send_poll_frame(struct pn533 *dev)
{
    struct pn533_poll_modulations *cur_mod;
    int rc;

    cur_mod = dev->poll_mod_active[dev->poll_mod_curr];

    pn533_build_poll_frame(dev, dev->out_frame, cur_mod);

    rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
                dev->in_maxlen, pn533_poll_complete,
                NULL, GFP_KERNEL);
    if (rc)
        nfc_dev_err(&dev->interface->dev, "Polling loop error %d", rc);

    return rc;
}

static void pn533_wq_poll(struct work_struct *work)
{
    struct pn533 *dev = container_of(work, struct pn533, poll_work);
    struct pn533_poll_modulations *cur_mod;
    int rc;

    cur_mod = dev->poll_mod_active[dev->poll_mod_curr];

    nfc_dev_dbg(&dev->interface->dev,
            "%s cancel_listen %d modulation len %d",
            __func__, dev->cancel_listen, cur_mod->len);

    if (dev->cancel_listen == 1) {
        dev->cancel_listen = 0;
        usb_kill_urb(dev->in_urb);
    }

    rc = pn533_send_poll_frame(dev);
    if (rc)
        return;

    if (cur_mod->len == 0 && dev->poll_mod_count > 1)
        mod_timer(&dev->listen_timer, jiffies + PN533_LISTEN_TIME * HZ);

    return;
}

static int pn533_start_poll(struct nfc_dev *nfc_dev,
                u32 im_protocols, u32 tm_protocols)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);

    nfc_dev_dbg(&dev->interface->dev,
            "%s: im protocols 0x%x tm protocols 0x%x",
            __func__, im_protocols, tm_protocols);

    if (dev->tgt_active_prot) {
        nfc_dev_err(&dev->interface->dev,
                "Cannot poll with a target already activated");
        return -EBUSY;
    }

    if (dev->tgt_mode) {
        nfc_dev_err(&dev->interface->dev,
                "Cannot poll while already being activated");
        return -EBUSY;
    }

    if (tm_protocols) {
        dev->gb = nfc_get_local_general_bytes(nfc_dev, &dev->gb_len);
        if (dev->gb == NULL)
            tm_protocols = 0;
    }

    dev->poll_mod_curr = 0;
    pn533_poll_create_mod_list(dev, im_protocols, tm_protocols);
    dev->poll_protocols = im_protocols;
    dev->listen_protocols = tm_protocols;

    return pn533_send_poll_frame(dev);
}

static void pn533_stop_poll(struct nfc_dev *nfc_dev)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    del_timer(&dev->listen_timer);

    if (!dev->poll_mod_count) {
        nfc_dev_dbg(&dev->interface->dev, "Polling operation was not"
                                " running");
        return;
    }

    /* An ack will cancel the last issued command (poll) */
    pn533_send_ack(dev, GFP_KERNEL);

    /* prevent pn533_start_poll_complete to issue a new poll meanwhile */
    usb_kill_urb(dev->in_urb);

    pn533_poll_reset_mod_list(dev);
}

static int pn533_activate_target_nfcdep(struct pn533 *dev)
{
    struct pn533_cmd_activate_param param;
    struct pn533_cmd_activate_response *resp;
    u16 gt_len;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_ATR);

    param.tg = 1;
    param.next = 0;
    memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), &param,
                sizeof(struct pn533_cmd_activate_param));
    dev->out_frame->datalen += sizeof(struct pn533_cmd_activate_param);

    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
                                dev->in_maxlen);
    if (rc)
        return rc;

    resp = (struct pn533_cmd_activate_response *)
                PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame);
    rc = resp->status & PN533_CMD_RET_MASK;
    if (rc != PN533_CMD_RET_SUCCESS)
        return -EIO;

    /* ATR_RES general bytes are located at offset 16 */
    gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 16;
    rc = nfc_set_remote_general_bytes(dev->nfc_dev, resp->gt, gt_len);

    return rc;
}

static int pn533_activate_target(struct nfc_dev *nfc_dev,
                 struct nfc_target *target, u32 protocol)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s - protocol=%u", __func__,
                                protocol);

    if (dev->poll_mod_count) {
        nfc_dev_err(&dev->interface->dev, "Cannot activate while"
                                " polling");
        return -EBUSY;
    }

    if (dev->tgt_active_prot) {
        nfc_dev_err(&dev->interface->dev, "There is already an active"
                                " target");
        return -EBUSY;
    }

    if (!dev->tgt_available_prots) {
        nfc_dev_err(&dev->interface->dev, "There is no available target"
                                " to activate");
        return -EINVAL;
    }

    if (!(dev->tgt_available_prots & (1 << protocol))) {
        nfc_dev_err(&dev->interface->dev, "The target does not support"
                    " the requested protocol %u", protocol);
        return -EINVAL;
    }

    if (protocol == NFC_PROTO_NFC_DEP) {
        rc = pn533_activate_target_nfcdep(dev);
        if (rc) {
            nfc_dev_err(&dev->interface->dev, "Error %d when"
                        " activating target with"
                        " NFC_DEP protocol", rc);
            return rc;
        }
    }

    dev->tgt_active_prot = protocol;
    dev->tgt_available_prots = 0;

    return 0;
}

static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
                    struct nfc_target *target)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);
    u8 tg;
    u8 status;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (!dev->tgt_active_prot) {
        nfc_dev_err(&dev->interface->dev, "There is no active target");
        return;
    }

    dev->tgt_active_prot = 0;

    skb_queue_purge(&dev->resp_q);

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_RELEASE);

    tg = 1;
    memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), &tg, sizeof(u8));
    dev->out_frame->datalen += sizeof(u8);

    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
                                dev->in_maxlen);
    if (rc) {
        nfc_dev_err(&dev->interface->dev, "Error when sending release"
                        " command to the controller");
        return;
    }

    status = PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame)[0];
    rc = status & PN533_CMD_RET_MASK;
    if (rc != PN533_CMD_RET_SUCCESS)
        nfc_dev_err(&dev->interface->dev, "Error 0x%x when releasing"
                            " the target", rc);

    return;
}


static int pn533_in_dep_link_up_complete(struct pn533 *dev, void *arg,
                        u8 *params, int params_len)
{
    struct pn533_cmd_jump_dep_response *resp;
    struct nfc_target nfc_target;
    u8 target_gt_len;
    int rc;
    struct pn533_cmd_jump_dep *cmd = (struct pn533_cmd_jump_dep *)arg;
    u8 active = cmd->active;

    kfree(arg);

    if (params_len == -ENOENT) {
        nfc_dev_dbg(&dev->interface->dev, "");
        return 0;
    }

    if (params_len < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when bringing DEP link up",
                                params_len);
        return 0;
    }

    if (dev->tgt_available_prots &&
        !(dev->tgt_available_prots & (1 << NFC_PROTO_NFC_DEP))) {
        nfc_dev_err(&dev->interface->dev,
            "The target does not support DEP");
        return -EINVAL;
    }

    resp = (struct pn533_cmd_jump_dep_response *) params;
    rc = resp->status & PN533_CMD_RET_MASK;
    if (rc != PN533_CMD_RET_SUCCESS) {
        nfc_dev_err(&dev->interface->dev,
                "Bringing DEP link up failed %d", rc);
        return 0;
    }

    if (!dev->tgt_available_prots) {
        nfc_dev_dbg(&dev->interface->dev, "Creating new target");

        nfc_target.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
        nfc_target.nfcid1_len = 10;
        memcpy(nfc_target.nfcid1, resp->nfcid3t, nfc_target.nfcid1_len);
        rc = nfc_targets_found(dev->nfc_dev, &nfc_target, 1);
        if (rc)
            return 0;

        dev->tgt_available_prots = 0;
    }

    dev->tgt_active_prot = NFC_PROTO_NFC_DEP;

    /* ATR_RES general bytes are located at offset 17 */
    target_gt_len = PN533_FRAME_CMD_PARAMS_LEN(dev->in_frame) - 17;
    rc = nfc_set_remote_general_bytes(dev->nfc_dev,
                        resp->gt, target_gt_len);
    if (rc == 0)
        rc = nfc_dep_link_is_up(dev->nfc_dev,
                        dev->nfc_dev->targets[0].idx,
                        !active, NFC_RF_INITIATOR);

    return 0;
}

static int pn533_mod_to_baud(struct pn533 *dev)
{
    switch (dev->poll_mod_curr) {
    case PN533_POLL_MOD_106KBPS_A:
        return 0;
    case PN533_POLL_MOD_212KBPS_FELICA:
        return 1;
    case PN533_POLL_MOD_424KBPS_FELICA:
        return 2;
    default:
        return -EINVAL;
    }
}

#define PASSIVE_DATA_LEN 5
static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
                 u8 comm_mode, u8* gb, size_t gb_len)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);
    struct pn533_cmd_jump_dep *cmd;
    u8 cmd_len, *data_ptr;
    u8 passive_data[PASSIVE_DATA_LEN] = {0x00, 0xff, 0xff, 0x00, 0x3};
    int rc, baud;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (dev->poll_mod_count) {
        nfc_dev_err(&dev->interface->dev,
                "Cannot bring the DEP link up while polling");
        return -EBUSY;
    }

    if (dev->tgt_active_prot) {
        nfc_dev_err(&dev->interface->dev,
                "There is already an active target");
        return -EBUSY;
    }

    baud = pn533_mod_to_baud(dev);
    if (baud < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Invalid curr modulation %d", dev->poll_mod_curr);
        return baud;
    }

    cmd_len = sizeof(struct pn533_cmd_jump_dep) + gb_len;
    if (comm_mode == NFC_COMM_PASSIVE)
        cmd_len += PASSIVE_DATA_LEN;

    cmd = kzalloc(cmd_len, GFP_KERNEL);
    if (cmd == NULL)
        return -ENOMEM;

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_IN_JUMP_FOR_DEP);

    cmd->active = !comm_mode;
    cmd->next = 0;
    cmd->baud = baud;
    data_ptr = cmd->data;
    if (comm_mode == NFC_COMM_PASSIVE && cmd->baud > 0) {
        memcpy(data_ptr, passive_data, PASSIVE_DATA_LEN);
        cmd->next |= 1;
        data_ptr += PASSIVE_DATA_LEN;
    }

    if (gb != NULL && gb_len > 0) {
        cmd->next |= 4; /* We have some Gi */
        memcpy(data_ptr, gb, gb_len);
    } else {
        cmd->next = 0;
    }

    memcpy(PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame), cmd, cmd_len);
    dev->out_frame->datalen += cmd_len;

    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
                dev->in_maxlen, pn533_in_dep_link_up_complete,
                cmd, GFP_KERNEL);
    if (rc < 0)
        kfree(cmd);

    return rc;
}

static int pn533_dep_link_down(struct nfc_dev *nfc_dev)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);

    pn533_poll_reset_mod_list(dev);

    if (dev->tgt_mode || dev->tgt_active_prot) {
        pn533_send_ack(dev, GFP_KERNEL);
        usb_kill_urb(dev->in_urb);
    }

    dev->tgt_active_prot = 0;
    dev->tgt_mode = 0;

    skb_queue_purge(&dev->resp_q);

    return 0;
}

static int pn533_build_tx_frame(struct pn533 *dev, struct sk_buff *skb,
                bool target)
{
    int payload_len = skb->len;
    struct pn533_frame *out_frame;
    u8 tg;

    nfc_dev_dbg(&dev->interface->dev, "%s - Sending %d bytes", __func__,
                                payload_len);

    if (payload_len > PN533_CMD_DATAEXCH_DATA_MAXLEN) {
        /* TODO: Implement support to multi-part data exchange */
        nfc_dev_err(&dev->interface->dev, "Data length greater than the"
                        " max allowed: %d",
                        PN533_CMD_DATAEXCH_DATA_MAXLEN);
        return -ENOSYS;
    }

    if (target == true) {
        switch (dev->device_type) {
        case PN533_DEVICE_PASORI:
            if (dev->tgt_active_prot == NFC_PROTO_FELICA) {
                skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN - 1);
                out_frame = (struct pn533_frame *) skb->data;
                pn533_tx_frame_init(out_frame,
                            PN533_CMD_IN_COMM_THRU);

                break;
            }

        default:
            skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN);
            out_frame = (struct pn533_frame *) skb->data;
            pn533_tx_frame_init(out_frame,
                        PN533_CMD_IN_DATA_EXCHANGE);
            tg = 1;
            memcpy(PN533_FRAME_CMD_PARAMS_PTR(out_frame),
                   &tg, sizeof(u8));
            out_frame->datalen += sizeof(u8);

            break;
        }

    } else {
        skb_push(skb, PN533_CMD_DATAEXCH_HEAD_LEN - 1);
        out_frame = (struct pn533_frame *) skb->data;
        pn533_tx_frame_init(out_frame, PN533_CMD_TG_SET_DATA);
    }


    /* The data is already in the out_frame, just update the datalen */
    out_frame->datalen += payload_len;

    pn533_tx_frame_finish(out_frame);
    skb_put(skb, PN533_FRAME_TAIL_SIZE);

    return 0;
}

struct pn533_data_exchange_arg {
    struct sk_buff *skb_resp;
    struct sk_buff *skb_out;
    data_exchange_cb_t cb;
    void *cb_context;
};

static struct sk_buff *pn533_build_response(struct pn533 *dev)
{
    struct sk_buff *skb, *tmp, *t;
    unsigned int skb_len = 0, tmp_len = 0;

    nfc_dev_dbg(&dev->interface->dev, "%s\n", __func__);

    if (skb_queue_empty(&dev->resp_q))
        return NULL;

    if (skb_queue_len(&dev->resp_q) == 1) {
        skb = skb_dequeue(&dev->resp_q);
        goto out;
    }

    skb_queue_walk_safe(&dev->resp_q, tmp, t)
        skb_len += tmp->len;

    nfc_dev_dbg(&dev->interface->dev, "%s total length %d\n",
            __func__, skb_len);

    skb = alloc_skb(skb_len, GFP_KERNEL);
    if (skb == NULL)
        goto out;

    skb_put(skb, skb_len);

    skb_queue_walk_safe(&dev->resp_q, tmp, t) {
        memcpy(skb->data + tmp_len, tmp->data, tmp->len);
        tmp_len += tmp->len;
    }

out:
    skb_queue_purge(&dev->resp_q);

    return skb;
}

static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
                        u8 *params, int params_len)
{
    struct pn533_data_exchange_arg *arg = _arg;
    struct sk_buff *skb = NULL, *skb_resp = arg->skb_resp;
    struct pn533_frame *in_frame = (struct pn533_frame *) skb_resp->data;
    int err = 0;
    u8 status;
    u8 cmd_ret;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    dev_kfree_skb(arg->skb_out);

    if (params_len < 0) { /* error */
        err = params_len;
        goto error;
    }

    status = params[0];

    cmd_ret = status & PN533_CMD_RET_MASK;
    if (cmd_ret != PN533_CMD_RET_SUCCESS) {
        nfc_dev_err(&dev->interface->dev, "PN533 reported error %d when"
                        " exchanging data", cmd_ret);
        err = -EIO;
        goto error;
    }

    skb_put(skb_resp, PN533_FRAME_SIZE(in_frame));
    skb_pull(skb_resp, PN533_CMD_DATAEXCH_HEAD_LEN);
    skb_trim(skb_resp, skb_resp->len - PN533_FRAME_TAIL_SIZE);
    skb_queue_tail(&dev->resp_q, skb_resp);

    if (status & PN533_CMD_MI_MASK) {
        queue_work(dev->wq, &dev->mi_work);
        return -EINPROGRESS;
    }

    skb = pn533_build_response(dev);
    if (skb == NULL)
        goto error;

    arg->cb(arg->cb_context, skb, 0);
    kfree(arg);
    return 0;

error:
    skb_queue_purge(&dev->resp_q);
    dev_kfree_skb(skb_resp);
    arg->cb(arg->cb_context, NULL, err);
    kfree(arg);
    return 0;
}

static int pn533_transceive(struct nfc_dev *nfc_dev,
                struct nfc_target *target, struct sk_buff *skb,
                data_exchange_cb_t cb, void *cb_context)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);
    struct pn533_frame *out_frame, *in_frame;
    struct pn533_data_exchange_arg *arg;
    struct sk_buff *skb_resp;
    int skb_resp_len;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    if (!dev->tgt_active_prot) {
        nfc_dev_err(&dev->interface->dev, "Cannot exchange data if"
                        " there is no active target");
        rc = -EINVAL;
        goto error;
    }

    rc = pn533_build_tx_frame(dev, skb, true);
    if (rc)
        goto error;

    skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN +
            PN533_CMD_DATAEXCH_DATA_MAXLEN +
            PN533_FRAME_TAIL_SIZE;

    skb_resp = nfc_alloc_recv_skb(skb_resp_len, GFP_KERNEL);
    if (!skb_resp) {
        rc = -ENOMEM;
        goto error;
    }

    in_frame = (struct pn533_frame *) skb_resp->data;
    out_frame = (struct pn533_frame *) skb->data;

    arg = kmalloc(sizeof(struct pn533_data_exchange_arg), GFP_KERNEL);
    if (!arg) {
        rc = -ENOMEM;
        goto free_skb_resp;
    }

    arg->skb_resp = skb_resp;
    arg->skb_out = skb;
    arg->cb = cb;
    arg->cb_context = cb_context;

    rc = pn533_send_cmd_frame_async(dev, out_frame, in_frame, skb_resp_len,
                    pn533_data_exchange_complete, arg,
                    GFP_KERNEL);
    if (rc) {
        nfc_dev_err(&dev->interface->dev, "Error %d when trying to"
                        " perform data_exchange", rc);
        goto free_arg;
    }

    return 0;

free_arg:
    kfree(arg);
free_skb_resp:
    kfree_skb(skb_resp);
error:
    kfree_skb(skb);
    return rc;
}

static int pn533_tm_send_complete(struct pn533 *dev, void *arg,
                  u8 *params, int params_len)
{
    struct sk_buff *skb_out = arg;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    dev_kfree_skb(skb_out);

    if (params_len < 0) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when sending data",
                params_len);

        return params_len;
    }

    if (params_len > 0 && params[0] != 0) {
        nfc_tm_deactivated(dev->nfc_dev);

        dev->tgt_mode = 0;

        return 0;
    }

    queue_work(dev->wq, &dev->tg_work);

    return 0;
}

static int pn533_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
{
    struct pn533 *dev = nfc_get_drvdata(nfc_dev);
    struct pn533_frame *out_frame;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    rc = pn533_build_tx_frame(dev, skb, false);
    if (rc)
        goto error;

    out_frame = (struct pn533_frame *) skb->data;

    rc = pn533_send_cmd_frame_async(dev, out_frame, dev->in_frame,
                    dev->in_maxlen, pn533_tm_send_complete,
                    skb, GFP_KERNEL);
    if (rc) {
        nfc_dev_err(&dev->interface->dev,
                "Error %d when trying to send data", rc);
        goto error;
    }

    return 0;

error:
    kfree_skb(skb);

    return rc;
}

static void pn533_wq_mi_recv(struct work_struct *work)
{
    struct pn533 *dev = container_of(work, struct pn533, mi_work);
    struct sk_buff *skb_cmd;
    struct pn533_data_exchange_arg *arg = dev->cmd_complete_arg;
    struct pn533_frame *out_frame, *in_frame;
    struct sk_buff *skb_resp;
    int skb_resp_len;
    int rc;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    /* This is a zero payload size skb */
    skb_cmd = alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN + PN533_FRAME_TAIL_SIZE,
                GFP_KERNEL);
    if (skb_cmd == NULL)
        goto error_cmd;

    skb_reserve(skb_cmd, PN533_CMD_DATAEXCH_HEAD_LEN);

    rc = pn533_build_tx_frame(dev, skb_cmd, true);
    if (rc)
        goto error_frame;

    skb_resp_len = PN533_CMD_DATAEXCH_HEAD_LEN +
            PN533_CMD_DATAEXCH_DATA_MAXLEN +
            PN533_FRAME_TAIL_SIZE;
    skb_resp = alloc_skb(skb_resp_len, GFP_KERNEL);
    if (!skb_resp) {
        rc = -ENOMEM;
        goto error_frame;
    }

    in_frame = (struct pn533_frame *) skb_resp->data;
    out_frame = (struct pn533_frame *) skb_cmd->data;

    arg->skb_resp = skb_resp;
    arg->skb_out = skb_cmd;

    rc = __pn533_send_cmd_frame_async(dev, out_frame, in_frame,
                      skb_resp_len,
                      pn533_data_exchange_complete,
                      dev->cmd_complete_arg, GFP_KERNEL);
    if (!rc)
        return;

    nfc_dev_err(&dev->interface->dev, "Error %d when trying to"
                        " perform data_exchange", rc);

    kfree_skb(skb_resp);

error_frame:
    kfree_skb(skb_cmd);

error_cmd:
    pn533_send_ack(dev, GFP_KERNEL);

    kfree(arg);

    queue_work(dev->wq, &dev->cmd_work);
}

static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
                                u8 cfgdata_len)
{
    int rc;
    u8 *params;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_RF_CONFIGURATION);

    params = PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame);
    params[0] = cfgitem;
    memcpy(&params[1], cfgdata, cfgdata_len);
    dev->out_frame->datalen += (1 + cfgdata_len);

    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
                                dev->in_maxlen);

    return rc;
}

static int pn533_fw_reset(struct pn533 *dev)
{
    int rc;
    u8 *params;

    nfc_dev_dbg(&dev->interface->dev, "%s", __func__);

    pn533_tx_frame_init(dev->out_frame, 0x18);

    params = PN533_FRAME_CMD_PARAMS_PTR(dev->out_frame);
    params[0] = 0x1;
    dev->out_frame->datalen += 1;

    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
                       dev->in_maxlen);

    return rc;
}

static struct nfc_ops pn533_nfc_ops = {
    .dev_up = NULL,
    .dev_down = NULL,
    .dep_link_up = pn533_dep_link_up,
    .dep_link_down = pn533_dep_link_down,
    .start_poll = pn533_start_poll,
    .stop_poll = pn533_stop_poll,
    .activate_target = pn533_activate_target,
    .deactivate_target = pn533_deactivate_target,
    .im_transceive = pn533_transceive,
    .tm_send = pn533_tm_send,
};

static int pn533_setup(struct pn533 *dev)
{
    struct pn533_config_max_retries max_retries;
    struct pn533_config_timing timing;
    u8 pasori_cfg[3] = {0x08, 0x01, 0x08};
    int rc;

    switch (dev->device_type) {
    case PN533_DEVICE_STD:
        max_retries.mx_rty_atr = PN533_CONFIG_MAX_RETRIES_ENDLESS;
        max_retries.mx_rty_psl = 2;
        max_retries.mx_rty_passive_act =
            PN533_CONFIG_MAX_RETRIES_NO_RETRY;

        timing.rfu = PN533_CONFIG_TIMING_102;
        timing.atr_res_timeout = PN533_CONFIG_TIMING_204;
        timing.dep_timeout = PN533_CONFIG_TIMING_409;

        break;

    case PN533_DEVICE_PASORI:
        max_retries.mx_rty_atr = 0x2;
        max_retries.mx_rty_psl = 0x1;
        max_retries.mx_rty_passive_act =
            PN533_CONFIG_MAX_RETRIES_NO_RETRY;

        timing.rfu = PN533_CONFIG_TIMING_102;
        timing.atr_res_timeout = PN533_CONFIG_TIMING_102;
        timing.dep_timeout = PN533_CONFIG_TIMING_204;

        break;

    default:
        nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
                dev->device_type);
        return -EINVAL;
    }

    rc = pn533_set_configuration(dev, PN533_CFGITEM_MAX_RETRIES,
                     (u8 *)&max_retries, sizeof(max_retries));
    if (rc) {
        nfc_dev_err(&dev->interface->dev,
                "Error on setting MAX_RETRIES config");
        return rc;
    }


    rc = pn533_set_configuration(dev, PN533_CFGITEM_TIMING,
                     (u8 *)&timing, sizeof(timing));
    if (rc) {
        nfc_dev_err(&dev->interface->dev,
                "Error on setting RF timings");
        return rc;
    }

    switch (dev->device_type) {
    case PN533_DEVICE_STD:
        break;

    case PN533_DEVICE_PASORI:
        pn533_fw_reset(dev);

        rc = pn533_set_configuration(dev, PN533_CFGITEM_PASORI,
                         pasori_cfg, 3);
        if (rc) {
            nfc_dev_err(&dev->interface->dev,
                    "Error while settings PASORI config");
            return rc;
        }

        pn533_fw_reset(dev);

        break;
    }

    return 0;
}

static int pn533_probe(struct usb_interface *interface,
            const struct usb_device_id *id)
{
    struct pn533_fw_version *fw_ver;
    struct pn533 *dev;
    struct usb_host_interface *iface_desc;
    struct usb_endpoint_descriptor *endpoint;
    int in_endpoint = 0;
    int out_endpoint = 0;
    int rc = -ENOMEM;
    int i;
    u32 protocols;

    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
    if (!dev)
        return -ENOMEM;

    dev->udev = usb_get_dev(interface_to_usbdev(interface));
    dev->interface = interface;
    mutex_init(&dev->cmd_lock);

    iface_desc = interface->cur_altsetting;
    for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
        endpoint = &iface_desc->endpoint[i].desc;

        if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint)) {
            dev->in_maxlen = le16_to_cpu(endpoint->wMaxPacketSize);
            in_endpoint = endpoint->bEndpointAddress;
        }

        if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint)) {
            dev->out_maxlen =
                le16_to_cpu(endpoint->wMaxPacketSize);
            out_endpoint = endpoint->bEndpointAddress;
        }
    }

    if (!in_endpoint || !out_endpoint) {
        nfc_dev_err(&interface->dev, "Could not find bulk-in or"
                            " bulk-out endpoint");
        rc = -ENODEV;
        goto error;
    }

    dev->in_frame = kmalloc(dev->in_maxlen, GFP_KERNEL);
    dev->in_urb = usb_alloc_urb(0, GFP_KERNEL);
    dev->out_frame = kmalloc(dev->out_maxlen, GFP_KERNEL);
    dev->out_urb = usb_alloc_urb(0, GFP_KERNEL);

    if (!dev->in_frame || !dev->out_frame ||
        !dev->in_urb || !dev->out_urb)
        goto error;

    usb_fill_bulk_urb(dev->in_urb, dev->udev,
            usb_rcvbulkpipe(dev->udev, in_endpoint),
            NULL, 0, NULL, dev);
    usb_fill_bulk_urb(dev->out_urb, dev->udev,
            usb_sndbulkpipe(dev->udev, out_endpoint),
            NULL, 0,
            pn533_send_complete, dev);

    INIT_WORK(&dev->cmd_work, pn533_wq_cmd);
    INIT_WORK(&dev->cmd_complete_work, pn533_wq_cmd_complete);
    INIT_WORK(&dev->mi_work, pn533_wq_mi_recv);
    INIT_WORK(&dev->tg_work, pn533_wq_tg_get_data);
    INIT_WORK(&dev->poll_work, pn533_wq_poll);
    dev->wq = alloc_ordered_workqueue("pn533", 0);
    if (dev->wq == NULL)
        goto error;

    init_timer(&dev->listen_timer);
    dev->listen_timer.data = (unsigned long) dev;
    dev->listen_timer.function = pn533_listen_mode_timer;

    skb_queue_head_init(&dev->resp_q);

    INIT_LIST_HEAD(&dev->cmd_queue);

    usb_set_intfdata(interface, dev);

    pn533_tx_frame_init(dev->out_frame, PN533_CMD_GET_FIRMWARE_VERSION);
    pn533_tx_frame_finish(dev->out_frame);

    rc = pn533_send_cmd_frame_sync(dev, dev->out_frame, dev->in_frame,
                                dev->in_maxlen);
    if (rc)
        goto destroy_wq;

    fw_ver = (struct pn533_fw_version *)
                PN533_FRAME_CMD_PARAMS_PTR(dev->in_frame);
    nfc_dev_info(&dev->interface->dev, "NXP PN533 firmware ver %d.%d now"
                    " attached", fw_ver->ver, fw_ver->rev);

    dev->device_type = id->driver_info;
    switch (dev->device_type) {
    case PN533_DEVICE_STD:
        protocols = PN533_ALL_PROTOCOLS;
        break;

    case PN533_DEVICE_PASORI:
        protocols = PN533_NO_TYPE_B_PROTOCOLS;
        break;

    default:
        nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
                dev->device_type);
        rc = -EINVAL;
        goto destroy_wq;
    }

    dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
                       PN533_CMD_DATAEXCH_HEAD_LEN,
                       PN533_FRAME_TAIL_SIZE);
    if (!dev->nfc_dev)
        goto destroy_wq;

    nfc_set_parent_dev(dev->nfc_dev, &interface->dev);
    nfc_set_drvdata(dev->nfc_dev, dev);

    rc = nfc_register_device(dev->nfc_dev);
    if (rc)
        goto free_nfc_dev;

    rc = pn533_setup(dev);
    if (rc)
        goto unregister_nfc_dev;

    return 0;

unregister_nfc_dev:
    nfc_unregister_device(dev->nfc_dev);

free_nfc_dev:
    nfc_free_device(dev->nfc_dev);

destroy_wq:
    destroy_workqueue(dev->wq);
error:
    kfree(dev->in_frame);
    usb_free_urb(dev->in_urb);
    kfree(dev->out_frame);
    usb_free_urb(dev->out_urb);
    kfree(dev);
    return rc;
}

static void pn533_disconnect(struct usb_interface *interface)
{
    struct pn533 *dev;
    struct pn533_cmd *cmd, *n;

    dev = usb_get_intfdata(interface);
    usb_set_intfdata(interface, NULL);

    nfc_unregister_device(dev->nfc_dev);
    nfc_free_device(dev->nfc_dev);

    usb_kill_urb(dev->in_urb);
    usb_kill_urb(dev->out_urb);

    destroy_workqueue(dev->wq);

    skb_queue_purge(&dev->resp_q);

    del_timer(&dev->listen_timer);

    list_for_each_entry_safe(cmd, n, &dev->cmd_queue, queue) {
        list_del(&cmd->queue);
        kfree(cmd);
    }

    kfree(dev->in_frame);
    usb_free_urb(dev->in_urb);
    kfree(dev->out_frame);
    usb_free_urb(dev->out_urb);
    kfree(dev);

    nfc_dev_info(&interface->dev, "NXP PN533 NFC device disconnected");
}

static struct usb_driver pn533_driver = {
    .name =     "pn533",
    .probe =    pn533_probe,
    .disconnect =   pn533_disconnect,
    .id_table = pn533_table,
};

module_usb_driver(pn533_driver);

MODULE_AUTHOR("Lauro Ramos Venancio <[email protected]>,"
            " Aloisio Almeida Jr <[email protected]>");
MODULE_DESCRIPTION("PN533 usb driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");