Patchwork [2/2] usb-ccid: add CCID device (device itself)

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Submitter Alon Levy
Date Oct. 5, 2010, 9:33 p.m.
Message ID <1286314380-23653-3-git-send-email-alevy@redhat.com>
Download mbox | patch
Permalink /patch/66872/
State New
Headers show

Comments

Alon Levy - Oct. 5, 2010, 9:33 p.m.
A CCID device is a smart card reader. It is a USB device, defined at [2].
The usb-ccid device expects a chardev option and uses the VSCARD protocol
defined in vscard_common.h. It starts as an unattached device
unless auto_attach=1.

The utility vscclient, bundled with libcac_card, provides the client side,
together they provide simultaneous access to the card reader an
the card attached to it, both in the guest and client machines, as opposed t
a simple usb host passthrough. You can also use it to provide a virtual card

 [1] libcac_card http://cgit.freedesktop.org/~alon/cac_card (temporary home)
     written by Robert Relyea <rrelyea@redhat.com>

 [2] http://www.usb.org/developers/devclass_docs/DWG_Smart-Card_CCID_Rev110.

Signed-off-by: Alon Levy <alevy@redhat.com>
---
 hw/usb-ccid.c | 1241 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 1241 insertions(+), 0 deletions(-)

Patch

diff --git a/hw/usb-ccid.c b/hw/usb-ccid.c
index 98805bb..cc4d6d1 100644
--- a/hw/usb-ccid.c
+++ b/hw/usb-ccid.c
@@ -11,3 +11,1244 @@ 
  * This code is licenced under the LGPL.
  */
 
+/* References:
+ *
+ * CCID Specification Revision 1.1 April 22nd 2005
+ *  "Universal Serial Bus, Device Class: Smart Card"
+ *  Specification for Integrated Circuit(s) Cards Interface Devices
+ *
+ * KNOWN BUGS
+ * 1. remove/insert can sometimes result in removed state instead of inserted.
+ * 2. if the chardev connection drops we don't get any notification. this can leave us in a state where there is a reader attached. this will cause vscclient to fail when it starts again since it will get VSC_Error in response to VSC_ReaderAdd. The correct fix is flow control. There is a trivial fix using chrdev ioctls, but it has not been accepted upstream.
+ *
+ */
+
+#include "qemu-common.h"
+#include "qemu-error.h"
+#include "usb.h"
+#include "qemu-char.h"
+
+#include "hw/vscard_common.h"
+
+static int debug = 0;
+
+#define DPRINTF(fmt, ...) \
+do { if (debug) { printf("usb-ccid: " fmt , ## __VA_ARGS__); } } while (0)
+
+#define RECV_BUF 384
+#define BULK_IN_FREE_START_NUM 5
+
+#define DeviceOutVendor    ((USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+#define DeviceInVendor     ((USB_DIR_IN |USB_TYPE_VENDOR|USB_RECIP_DEVICE)<<8)
+
+#define CCID_CONTROL_ABORT                  0x1
+#define CCID_CONTROL_GET_CLOCK_FREQUENCIES  0x2
+#define CCID_CONTROL_GET_DATA_RATES         0x3
+
+#define CCID_PRODUCT_DESCRIPTION        "QEMU USB CCID"
+#define CCID_VENDOR_DESCRIPTION         "QEMU " QEMU_VERSION
+#define CCID_INTERFACE_NAME             "CCID Interface"
+#define CCID_SERIAL_NUMBER_STRING       "1"
+/* Using Gemplus Vendor and Product id
+  Effect on various drivers:
+  * usbccid.sys (winxp, others untested) is a class driver so it doesn't care.
+  * linux has a number of class drivers, but openct filters based on
+    vendor/product (/etc/openct.conf under fedora), hence Gemplus.
+ */
+#define CCID_VENDOR_ID                  0x08e6
+#define CCID_PRODUCT_ID                 0x4433
+#define CCID_DEVICE_VERSION             0x0000
+
+/* BULK_OUT messages from PC to Reader
+   Defined in CCID Rev 1.1 6.1 (page 26)
+ */
+#define CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOn              0x62
+#define CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOff             0x63
+#define CCID_MESSAGE_TYPE_PC_to_RDR_GetSlotStatus           0x65
+#define CCID_MESSAGE_TYPE_PC_to_RDR_XfrBlock                0x6f
+#define CCID_MESSAGE_TYPE_PC_to_RDR_GetParameters           0x6c
+#define CCID_MESSAGE_TYPE_PC_to_RDR_ResetParameters         0x6d
+#define CCID_MESSAGE_TYPE_PC_to_RDR_SetParameters           0x61
+#define CCID_MESSAGE_TYPE_PC_to_RDR_Escape                  0x6b
+#define CCID_MESSAGE_TYPE_PC_to_RDR_IccClock                0x6e
+#define CCID_MESSAGE_TYPE_PC_to_RDR_T0APDU                  0x6a
+#define CCID_MESSAGE_TYPE_PC_to_RDR_Secure                  0x69
+#define CCID_MESSAGE_TYPE_PC_to_RDR_Mechanical              0x71
+#define CCID_MESSAGE_TYPE_PC_to_RDR_Abort                   0x72
+#define CCID_MESSAGE_TYPE_PC_to_RDR_SetDataRateAndClockFrequency 0x73
+
+/* BULK_IN messages from Reader to PC
+   Defined in CCID Rev 1.1 6.2 (page 48)
+ */
+#define CCID_MESSAGE_TYPE_RDR_to_PC_DataBlock               0x80
+#define CCID_MESSAGE_TYPE_RDR_to_PC_SlotStatus              0x81
+#define CCID_MESSAGE_TYPE_RDR_to_PC_Parameters              0x82
+#define CCID_MESSAGE_TYPE_RDR_to_PC_Escape                  0x83
+#define CCID_MESSAGE_TYPE_RDR_to_PC_DataRateAndClockFrequency 0x84
+
+/* INTERRUPT_IN messages from Reader to PC
+   Defined in CCID Rev 1.1 6.3 (page 56)
+ */
+#define CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange        0x50
+#define CCID_MESSAGE_TYPE_RDR_to_PC_HardwareError           0x51
+
+/* Endpoints for CCID - addresses are up to us to decide.
+   To support slot insertion and removal we must have an interrupt in ep
+   in addition we need a bulk in and bulk out ep
+   5.2, page 20
+ */
+#define CCID_INT_IN_EP       1
+#define CCID_BULK_IN_EP      2
+#define CCID_BULK_OUT_EP     3
+
+/* bmSlotICCState masks */
+#define SLOT_0_STATE_MASK    1
+#define SLOT_0_CHANGED_MASK  2
+
+/* Status codes that go in bStatus (see 6.2.6) */
+enum {
+    ICC_STATUS_PRESENT_ACTIVE = 0,
+    ICC_STATUS_PRESENT_INACTIVE,
+    ICC_STATUS_NOT_PRESENT
+};
+
+enum {
+    COMMAND_STATUS_NO_ERROR = 0,
+    COMMAND_STATUS_FAILED,
+    COMMAND_STATUS_TIME_EXTENSION_REQUIRED
+};
+
+/* Error codes that go in bError (see 6.2.6)
+ */
+enum {
+    ERROR_CMD_NOT_SUPPORTED = 0,
+    ERROR_CMD_ABORTED       = -1,
+    ERROR_ICC_MUTE          = -2,
+    ERROR_XFR_PARITY_ERROR  = -3,
+    ERROR_XFR_OVERRUN       = -4,
+    ERROR_HW_ERROR          = -5,
+};
+
+/* 6.2.6 RDR_to_PC_SlotStatus definitions */
+enum {
+    CLOCK_STATUS_RUNNING = 0,
+    /* 0 - Clock Running, 1 - Clock stopped in State L, 2 - H,
+       3 - unkonwn state. rest are RFU
+     */
+};
+
+typedef struct __attribute__ ((__packed__)) {
+    uint8_t     bMessageType;
+    uint32_t    dwLength;
+    uint8_t     bSlot;
+    uint8_t     bSeq;
+} CCID_Header;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_Header hdr;
+    uint8_t     bStatus;        /* Only used in BULK_IN */
+    uint8_t     bError;         /* Only used in BULK_IN */
+} CCID_BULK_IN;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_BULK_IN b;
+    uint8_t     bClockStatus;
+} CCID_SlotStatus;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_BULK_IN b;
+    uint8_t     bProtocolNum;
+    uint8_t     abProtocolDataStructure[0];
+} CCID_Parameter;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_BULK_IN b;
+    uint8_t      bChainParameter;
+    uint8_t      abData[0];
+} CCID_DataBlock;
+
+/* 6.1.4 PC_to_RDR_XfrBlock */
+typedef struct __attribute__ ((__packed__)) {
+    CCID_Header  hdr;
+    uint8_t      bBWI; /* Block Waiting Timeout */
+    uint16_t     wLevelParameter;
+    uint8_t      abData[0];
+} CCID_XferBlock;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_Header hdr;
+    uint8_t     bPowerSelect;
+    uint16_t    abRFU;
+} CCID_IccPowerOn;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_Header hdr;
+    uint16_t    abRFU;
+} CCID_IccPowerOff;
+
+typedef struct __attribute__ ((__packed__)) {
+    CCID_Header hdr;
+    uint8_t     bProtocolNum;
+    uint8_t    abProtocolDataStructure[0];
+} CCID_SetParameter;
+
+typedef struct {
+    uint8_t     bMessageType; /* CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange */
+    uint8_t     bmSlotICCState;
+} CCID_Notify_Slot_Change;
+
+#define MAX_ATR_SIZE        40
+#define MAX_PROTOCOL_SIZE   7
+
+/* used for DataBlock response to XferBlock */
+typedef struct answer_t {
+    uint8_t slot;
+    uint8_t seq;
+    QSIMPLEQ_ENTRY(answer_t) entry;
+} answer_t;
+
+/* pending bulk_in messages */
+typedef struct bulk_in_t {
+    uint8_t* data;
+    int      len;
+    int      pos;
+    QSIMPLEQ_ENTRY(bulk_in_t) entry;
+} bulk_in_t;
+
+/**
+ * powered - defaults to true, changed by PowerOn/PowerOff messages
+ */
+typedef struct {
+    USBDevice dev;
+    CharDriverState *cs;
+    uint8_t  debug;
+    uint8_t  auto_attach;
+    uint8_t  atr[MAX_ATR_SIZE];
+    uint8_t  atr_length;
+    QSIMPLEQ_HEAD(bulk_in, bulk_in_t) bulk_in_pending;
+    QSIMPLEQ_HEAD(bulk_in_free, bulk_in_t) bulk_in_free;
+    bulk_in_t   *current_bulk_in;
+    uint8_t* bulk_out_data;
+    uint32_t bulk_out_len;
+    uint32_t bulk_out_pos;
+    uint8_t* vscard_in_data;
+    uint32_t vscard_in_pos;
+    uint32_t vscard_in_hdr;
+    uint32_t vscard_in_len;
+    uint8_t  bmSlotICCState;
+    bool     powered;
+    bool     notify_slot_change;
+    uint64_t last_answer_error;
+    QSIMPLEQ_HEAD(pending_answers, answer_t) pending_answers;
+    uint8_t  bError;
+    uint8_t  bmCommandStatus;
+    uint8_t  bProtocolNum;
+    uint8_t  abProtocolDataStructure[MAX_PROTOCOL_SIZE];
+    uint32_t ulProtocolDataStructureSize;
+} USBCCIDState;
+
+/* Slot specific variables. We emulate a single slot card reader.
+ */
+
+uint8_t DEFAULT_ATR[] = {
+/* From some example somewhere
+ 0x3B, 0xB0, 0x18, 0x00, 0xD1, 0x81, 0x05, 0xB1, 0x40, 0x38, 0x1F, 0x03, 0x28
+ */
+
+/* From an Athena smart card */
+ 0x3B, 0xD5, 0x18, 0xFF, 0x80, 0x91, 0xFE, 0x1F, 0xC3, 0x80, 0x73, 0xC8, 0x21, 0x13, 0x08
+
+}; /* maximum size of ATR - from 7816-3 */
+
+
+/* CCID Spec chapter 4: CCID uses a standard device descriptor per Chapter 9,
+ * "USB Device Framework", section 9.6.1, in the Universal Serial Bus
+ * Specification.
+ *
+ * This device implemented based on the spec and with an Athena Smart Card
+ * Reader as reference:
+ *   0dc3:1004 Athena Smartcard Solutions, Inc.
+ */
+
+static const uint8_t qemu_ccid_dev_descriptor[] = {
+        0x12,       /*  u8 bLength; */
+        USB_DT_DEVICE, /*  u8 bDescriptorType; Device */
+        0x10, 0x01, /*  u16 bcdUSB; v1.1 */
+
+        0x00,       /*  u8  bDeviceClass; */
+        0x00,       /*  u8  bDeviceSubClass; */
+        0x00,       /*  u8  bDeviceProtocol; [ low/full speeds only ] */
+        0x40,       /*  u8  bMaxPacketSize0; 8 Bytes (valid: 8,16,32,64) */
+
+        /* Vendor and product id are arbitrary.  */
+                    /*  u16 idVendor  */
+        CCID_VENDOR_ID & 0xff, CCID_VENDOR_ID >> 8,
+                    /*  u16 idProduct */
+        CCID_PRODUCT_ID & 0xff, CCID_PRODUCT_ID >> 8,
+                    /*  u16 bcdDevice */
+        CCID_DEVICE_VERSION & 0xff, CCID_DEVICE_VERSION >> 8,
+        0x01,       /*  u8  iManufacturer; */
+        0x02,       /*  u8  iProduct; */
+        0x03,       /*  u8  iSerialNumber; */
+        0x01,       /*  u8  bNumConfigurations; */
+};
+
+static const uint8_t qemu_ccid_config_descriptor[] = {
+
+        /* one configuration */
+        0x09,       /*  u8  bLength; */
+        USB_DT_CONFIG, /*  u8  bDescriptorType; Configuration */
+        0x5d, 0x00, /*  u16 wTotalLength; 9+9+54+7+7+7 */
+        0x01,       /*  u8  bNumInterfaces; (1) */
+        0x01,       /*  u8  bConfigurationValue; */
+        0x00,       /*  u8  iConfiguration; */
+        0x80,       /*  u8  bmAttributes;
+                                 Bit 7: must be set,
+                                     6: Self-powered,
+                                     5: Remote wakeup,
+                                     4..0: resvd */
+        100/2,      /*  u8  MaxPower; 50 == 100mA */
+
+        /* one interface */
+        0x09,       /*  u8  if_bLength; */
+        USB_DT_INTERFACE, /*  u8  if_bDescriptorType; Interface */
+        0x00,       /*  u8  if_bInterfaceNumber; */
+        0x00,       /*  u8  if_bAlternateSetting; */
+        0x03,       /*  u8  if_bNumEndpoints; */
+        0x0b,       /*  u8  if_bInterfaceClass; Smart Card Device Class */
+        0x00,       /*  u8  if_bInterfaceSubClass; Subclass code */
+        0x00,       /*  u8  if_bInterfaceProtocol; Protocol code */
+        0x04,       /*  u8  if_iInterface; Index of string descriptor */
+
+        /* Smart Card Device Class Descriptor */
+        0x36,       /*  u8  bLength; */
+        0x21,       /*  u8  bDescriptorType; Functional */
+        0x10, 0x01, /*  u16 bcdCCID; CCID Specification Release Number. */
+        0x00,       /*  u8  bMaxSlotIndex; The index of the highest available
+                        slot on this device. All slots are consecutive starting
+                        at 00h. */
+        0x07,       /*  u8  bVoltageSupport; 01h - 5.0v, 02h - 3.0, 03 - 1.8 */
+
+        0x03, 0x00, /*  u32 dwProtocols; RRRR PPPP. RRRR = 0000h.*/
+        0x00, 0x00, /*  PPPP: 0001h = Protocol T=0, 0002h = Protocol T=1 */
+                    /*  u32 dwDefaultClock; in kHZ (0x0fa0 is 4 MHz) */
+        0xa0, 0x0f, 0x00, 0x00,
+                    /*  u32 dwMaximumClock; */
+        0x00, 0x00, 0x01, 0x00,
+        0x00,       /*  u8 bNumClockSupported; 0 means just the default and max. */
+                    /*  u32 dwDataRate ;bps. 9600 == 00002580h */
+        0x80, 0x25, 0x00, 0x00,
+                    /*  u32 dwMaxDataRate ; 11520 bps == 0001C200h */
+        0x00, 0xC2, 0x01, 0x00,
+        0x00,       /*  u8  bNumDataRatesSupported; 00 means all rates between
+                     *      default and max */
+                    /*  u32 dwMaxIFSD; maximum IFSD supported by CCID for protocol
+                     *      T=1 (Maximum seen from various cards) */
+        0xfe, 0x00, 0x00, 0x00,
+                    /*  u32 dwSyncProtocols; 1 - 2-wire, 2 - 3-wire, 4 - I2C */
+        0x00, 0x00, 0x00, 0x00,
+                    /*  u32 dwMechanical;  0 - no special characteristics. */
+        0x00, 0x00, 0x00, 0x00,
+                    /*  u32 dwFeatures;
+                     *  0 - No special characteristics
+                     *  + 2 Automatic parameter configuration based on ATR data
+                     *  + 4 Automatic activation of ICC on inserting
+                     *  + 8 Automatic ICC voltage selection
+                     *  + 10 Automatic ICC clock frequency change
+                     *  + 20 Automatic baud rate change
+                     *  + 40 Automatic parameters negotiation made by the CCID
+                     *  + 80 automatic PPS made by the CCID
+                     *  100 CCID can set ICC in clock stop mode
+                     *  200 NAD value other then 00 accepted (T=1 protocol)
+                     *  + 400 Automatic IFSD exchange as first exchange (T=1)
+                     *  One of the following only:
+                     *  + 10000 TPDU level exchanges with CCID
+                     *  20000 Short APDU level exchange with CCID
+                     *  40000 Short and Extended APDU level exchange with CCID
+                     *
+                     *  100000 USB Wake up signaling supported on card insertion
+                     *  and removal. Must set bit 5 in bmAttributes in Configuration
+                     *  descriptor if 100000 is set.*/
+        0xfe, 0x04, 0x01, 0x00,
+                    /*  u32 dwMaxCCIDMessageLength; For extended APDU in [261 + 10
+                     *  , 65544 + 10]. Otherwise the minimum is wMaxPacketSize of
+                     *  the Bulk-OUT endpoint */
+        0x12, 0x00, 0x01, 0x00,
+        0xFF,       /*  u8  bClassGetResponse; Significant only for CCID that
+                     *  offers an APDU level for exchanges. Indicates the default
+                     *  class value used by the CCID when it sends a Get Response
+                     *  command to perform the transportation of an APDU by T=0
+                     *  protocol
+                     *  FFh indicates that the CCID echos the class of the APDU.
+                     */
+        0xFF,       /*  u8  bClassEnvelope; EAPDU only. Envelope command for T=0 */
+        0x00, 0x00, /*  u16 wLcdLayout; XXYY Number of lines (XX) and chars per
+                     *  line for LCD display used for PIN entry. 0000 - no LCD */
+        0x01,       /*  u8  bPINSupport; 01h PIN Verification,
+                     *                   02h PIN Modification */
+        0x01,       /*  u8  bMaxCCIDBusySlots; */
+
+        /* Interrupt-IN endpoint */
+        0x07,       /*  u8  ep_bLength; */
+                    /*  u8  ep_bDescriptorType; Endpoint */
+        USB_DT_ENDPOINT,
+                    /*  u8  ep_bEndpointAddress; IN Endpoint 1 */
+        0x80 | CCID_INT_IN_EP,
+        0x03,       /*  u8  ep_bmAttributes; Interrupt */
+        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
+        0xff,       /*  u8  ep_bInterval; */
+
+        /* Bulk-In endpoint */
+        0x07,       /*  u8  ep_bLength; */
+                    /*  u8  ep_bDescriptorType; Endpoint */
+        USB_DT_ENDPOINT,
+                    /*  u8  ep_bEndpointAddress; IN Endpoint 2 */
+        0x80 | CCID_BULK_IN_EP,
+        0x02,       /*  u8  ep_bmAttributes; Bulk */
+        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
+        0x00,       /*  u8  ep_bInterval; */
+
+        /* Bulk-Out endpoint */
+        0x07,       /*  u8  ep_bLength; */
+                    /*  u8  ep_bDescriptorType; Endpoint */
+        USB_DT_ENDPOINT,
+                    /*  u8  ep_bEndpointAddress; OUT Endpoint 3 */
+        CCID_BULK_OUT_EP,
+        0x02,       /*  u8  ep_bmAttributes; Bulk */
+        0x40, 0x00, /*  u16 ep_wMaxPacketSize; */
+        0x00,       /*  u8  ep_bInterval; */
+
+};
+
+static bool ccid_has_pending_answers(USBCCIDState *s)
+{
+    return !QSIMPLEQ_EMPTY(&s->pending_answers);
+}
+
+static void ccid_clear_pending_answers(USBCCIDState *s)
+{
+    answer_t *answer;
+
+    QSIMPLEQ_FOREACH(answer, &s->pending_answers, entry) {
+        qemu_free(answer);
+    }
+    QSIMPLEQ_INIT(&s->pending_answers);
+}
+
+static void ccid_print_pending_answers(USBCCIDState *s)
+{
+#ifdef DEBUG_CCID
+    answer_t *answer;
+
+    printf("usb-ccid: pending answers:");
+    if (!ccid_has_pending_answers(s)) {
+        printf(" empty\n");
+        return;
+    }
+    QSIMPLEQ_FOREACH(answer, &s->pending_answers, entry) {
+        if (QSIMPLEQ_NEXT(answer, entry) == NULL) {
+            printf("%d:%d\n", answer->slot, answer->seq);
+        } else {
+            printf("%d:%d,", answer->slot, answer->seq);
+        }
+    }
+#endif
+}
+
+static void ccid_add_pending_answer(USBCCIDState *s, CCID_Header *hdr)
+{
+    answer_t* answer;
+
+    answer = qemu_mallocz(sizeof(answer_t));
+    answer->slot = hdr->bSlot;
+    answer->seq = hdr->bSeq;
+    QSIMPLEQ_INSERT_TAIL(&s->pending_answers, answer, entry);
+    ccid_print_pending_answers(s);
+}
+
+static void ccid_remove_pending_answer(USBCCIDState *s,
+    uint8_t *slot, uint8_t *seq)
+{
+    answer_t *answer;
+
+    answer = QSIMPLEQ_FIRST(&s->pending_answers);
+    *slot = answer->slot;
+    *seq = answer->seq;
+    QSIMPLEQ_REMOVE_HEAD(&s->pending_answers, entry);
+    qemu_free(answer);
+    ccid_print_pending_answers(s);
+}
+
+static void ccid_bulk_in_clear(USBCCIDState *s)
+{
+    bulk_in_t* bulk_in;
+
+    while (!QSIMPLEQ_EMPTY(&s->bulk_in_pending)) {
+        bulk_in = QSIMPLEQ_FIRST(&s->bulk_in_pending);
+        QSIMPLEQ_REMOVE_HEAD(&s->bulk_in_pending, entry);
+        QSIMPLEQ_INSERT_TAIL(&s->bulk_in_free, bulk_in, entry);
+    }
+}
+
+static void ccid_reset(USBCCIDState *s)
+{
+    ccid_bulk_in_clear(s);
+    ccid_clear_pending_answers(s);
+}
+
+
+static void ccid_detach(USBCCIDState *s)
+{
+    ccid_reset(s);
+    if (s->auto_attach == 0 && s->dev.attached) {
+        usb_device_detach(&s->dev);
+    }
+}
+
+static void ccid_handle_reset(USBDevice *dev)
+{
+    USBCCIDState *s = (USBCCIDState *)dev;
+
+    DPRINTF("Reset\n");
+
+    ccid_reset(s);
+}
+
+static int ccid_handle_control(USBDevice *dev, int request, int value,
+                                  int index, int length, uint8_t *data)
+{
+    int ret = 0;
+
+    DPRINTF("got control %x, value %x\n",request, value);
+    switch (request) {
+    case DeviceRequest | USB_REQ_GET_STATUS:
+        data[0] = (0 << USB_DEVICE_SELF_POWERED) |
+            (dev->remote_wakeup << USB_DEVICE_REMOTE_WAKEUP);
+        data[1] = 0x00;
+        ret = 2;
+        break;
+    case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
+        if (value == USB_DEVICE_REMOTE_WAKEUP) {
+            dev->remote_wakeup = 0;
+        } else {
+            goto fail;
+        }
+        ret = 0;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_FEATURE:
+        if (value == USB_DEVICE_REMOTE_WAKEUP) {
+            dev->remote_wakeup = 1;
+        } else {
+            goto fail;
+        }
+        ret = 0;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
+        dev->addr = value;
+        ret = 0;
+        break;
+    case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+        switch(value >> 8) {
+        case USB_DT_DEVICE:
+            memcpy(data, qemu_ccid_dev_descriptor,
+                   sizeof(qemu_ccid_dev_descriptor));
+            ret = sizeof(qemu_ccid_dev_descriptor);
+            break;
+        case USB_DT_CONFIG:
+            memcpy(data, qemu_ccid_config_descriptor,
+                   sizeof(qemu_ccid_config_descriptor));
+            ret = sizeof(qemu_ccid_config_descriptor);
+            break;
+        case USB_DT_STRING:
+            switch(value & 0xff) {
+            case 0:
+                /* language ids */
+                data[0] = 4;
+                data[1] = 3;
+                data[2] = 0x09;
+                data[3] = 0x04;
+                ret = 4;
+                break;
+            case 1:
+                /* vendor description */
+                ret = set_usb_string(data, CCID_VENDOR_DESCRIPTION);
+                break;
+            case 2:
+                /* product description */
+                ret = set_usb_string(data, CCID_PRODUCT_DESCRIPTION);
+                break;
+            case 3:
+                /* serial number */
+                ret = set_usb_string(data, CCID_SERIAL_NUMBER_STRING);
+                break;
+            case 4:
+                /* interface name */
+                ret = set_usb_string(data, CCID_INTERFACE_NAME);
+                break;
+            default:
+                goto fail;
+            }
+            break;
+        default:
+            goto fail;
+        }
+        break;
+    case DeviceRequest | USB_REQ_GET_CONFIGURATION:
+        data[0] = 1;
+        ret = 1;
+        break;
+    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
+        /* Only one configuration - we just ignore the request */
+        ret = 0;
+        break;
+    case DeviceRequest | USB_REQ_GET_INTERFACE:
+        data[0] = 0;
+        ret = 1;
+        break;
+    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
+        ret = 0;
+        break;
+    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
+        ret = 0;
+        break;
+
+        /* Class specific requests.  */
+    case DeviceOutVendor | CCID_CONTROL_ABORT:
+        DPRINTF("ccid_control abort UNIMPLEMENTED\n");
+        ret = USB_RET_STALL;
+        break;
+    case DeviceOutVendor | CCID_CONTROL_GET_CLOCK_FREQUENCIES:
+        DPRINTF("ccid_control get clock frequencies UNIMPLEMENTED\n");
+        ret = USB_RET_STALL;
+        break;
+    case DeviceOutVendor | CCID_CONTROL_GET_DATA_RATES:
+        DPRINTF("ccid_control get data rates UNIMPLEMENTED\n");
+        ret = USB_RET_STALL;
+        break;
+    default:
+    fail:
+        DPRINTF("got unsupported/bogus control %x, value %x\n", request, value);
+        ret = USB_RET_STALL;
+        break;
+    }
+    return ret;
+}
+
+static void ccid_bulk_in_release(USBCCIDState *s)
+{
+    s->current_bulk_in->pos = 0;
+    s->current_bulk_in->len = RECV_BUF;
+    QSIMPLEQ_INSERT_TAIL(&s->bulk_in_free, s->current_bulk_in, entry);
+    s->current_bulk_in = NULL;
+}
+
+static void ccid_bulk_in_get(USBCCIDState *s)
+{
+    if (s->current_bulk_in != NULL || QSIMPLEQ_EMPTY(&s->bulk_in_pending)) {
+        return;
+    }
+    s->current_bulk_in = QSIMPLEQ_FIRST(&s->bulk_in_pending);
+    QSIMPLEQ_REMOVE_HEAD(&s->bulk_in_pending, entry);
+}
+
+static uint8_t* ccid_reserve_recv_buf(USBCCIDState* s, uint16_t len)
+{
+    bulk_in_t* bulk_in;
+
+    DPRINTF("%s: QUEUE: reserve %d bytes\n", __func__, len);
+
+    /* look for an existing element */
+    if (len > RECV_BUF) {
+        printf("usb-ccid.c: %s: len larger then max (%d>%d). bailing out.\n",
+            __func__, len, RECV_BUF);
+        exit(-1);
+    }
+    if (QSIMPLEQ_EMPTY(&s->bulk_in_free)) {
+        printf("usb-ccid.c: %s: No buffers in bulk_in_free. discarding message.\n",
+                __func__);
+        return NULL;
+    }
+    bulk_in = QSIMPLEQ_FIRST(&s->bulk_in_free);
+    QSIMPLEQ_REMOVE_HEAD(&s->bulk_in_free, entry);
+    QSIMPLEQ_INSERT_TAIL(&s->bulk_in_pending, bulk_in, entry);
+    bulk_in->len = len;
+    return bulk_in->data;
+}
+
+static bool ccid_card_inserted(USBCCIDState *s)
+{
+    return s->bmSlotICCState & SLOT_0_STATE_MASK;
+}
+
+static uint8_t ccid_card_status(USBCCIDState *s)
+{
+    return ccid_card_inserted(s)
+            ? (s->powered ?
+                ICC_STATUS_PRESENT_ACTIVE
+              : ICC_STATUS_PRESENT_INACTIVE
+              )
+            : ICC_STATUS_NOT_PRESENT;
+}
+
+static uint8_t ccid_calc_status(USBCCIDState *s)
+{
+    /* page 55, 6.2.6, calculation of bStatus from bmICCStatus and
+       bmCommandStatus
+     */
+    uint8_t ret = ccid_card_status(s) | (s->bmCommandStatus << 6);
+#ifdef DEBUG_CCID
+    DPRINTF("status = %d\n", ret);
+#endif
+    return ret;
+}
+
+static void ccid_reset_error_status(USBCCIDState* s)
+{
+    s->bError = ERROR_CMD_NOT_SUPPORTED;
+    s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+}
+
+static void ccid_write_slot_status(USBCCIDState* s, CCID_Header* recv)
+{
+    CCID_SlotStatus *h = (CCID_SlotStatus*)ccid_reserve_recv_buf(s, sizeof(CCID_SlotStatus));
+    if (h == NULL) {
+        return;
+    }
+    h->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_SlotStatus;
+    h->b.hdr.dwLength = 0;
+    h->b.hdr.bSlot = recv->bSlot;
+    h->b.hdr.bSeq = recv->bSeq;
+    h->b.bStatus = ccid_calc_status(s);
+    h->b.bError = s->bError;
+    h->bClockStatus = CLOCK_STATUS_RUNNING;
+    ccid_reset_error_status(s);
+}
+
+static void ccid_write_parameters(USBCCIDState* s, CCID_Header* recv)
+{
+    CCID_Parameter *h;
+    uint32_t len = s->ulProtocolDataStructureSize;
+
+    h = (CCID_Parameter *)ccid_reserve_recv_buf(s, sizeof(CCID_Parameter) + len);
+    if (h == NULL) {
+        return;
+    }
+    h->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_Parameters;
+    h->b.hdr.dwLength = 0;
+    h->b.hdr.bSlot = recv->bSlot;
+    h->b.hdr.bSeq = recv->bSeq;
+    h->b.bStatus = ccid_calc_status(s);
+    h->b.bError = s->bError;
+    h->bProtocolNum = s->bProtocolNum;
+    memcpy(h->abProtocolDataStructure, s->abProtocolDataStructure, len);
+    ccid_reset_error_status(s);
+}
+
+static void ccid_write_data_block(
+    USBCCIDState* s, uint8_t slot, uint8_t seq,
+    const uint8_t* data, uint32_t len)
+{
+    CCID_DataBlock *p;
+
+    p = (CCID_DataBlock*)ccid_reserve_recv_buf(s, sizeof(*p) + len);
+    if (p == NULL) {
+        return;
+    }
+    p->b.hdr.bMessageType = CCID_MESSAGE_TYPE_RDR_to_PC_DataBlock;
+    p->b.hdr.dwLength = len;
+    p->b.hdr.bSlot = slot;
+    p->b.hdr.bSeq = seq;
+    p->b.bStatus = ccid_calc_status(s);
+    p->b.bError = s->bError;
+#ifdef DEBUG_CCID
+    if (p->b.bError) {
+        DPRINTF("error %d", p->b.bError);
+    }
+#endif
+    memcpy(p->abData, data, len);
+    ccid_reset_error_status(s);
+}
+
+static void ccid_write_data_block_answer(USBCCIDState* s,
+    const uint8_t* data, uint32_t len)
+{
+    uint8_t seq;
+    uint8_t slot;
+
+    if (!ccid_has_pending_answers(s)) {
+        abort();
+    }
+    ccid_remove_pending_answer(s, &slot, &seq);
+    ccid_write_data_block(s, slot, seq, data, len);
+}
+
+static void ccid_write_data_block_atr(USBCCIDState* s, CCID_Header* recv)
+{
+    ccid_write_data_block(s, recv->bSlot, recv->bSeq, s->atr, s->atr_length);
+}
+
+static void ccid_set_parameters(USBCCIDState *s, CCID_Header *recv)
+{
+    CCID_SetParameter *ph = (CCID_SetParameter *) recv;
+    uint32_t len = 0;
+    if (ph->bProtocolNum == 0) {
+        len = 5;
+    }
+    if (ph->bProtocolNum == 1) {
+        len = 7;
+    }
+    if (len == 0) {
+        s->bmCommandStatus = COMMAND_STATUS_FAILED;
+        s->bError = 7; /* Protocol invalid or not supported */
+        return;
+    }
+    s->bProtocolNum = ph->bProtocolNum;
+    memcpy(s->abProtocolDataStructure, ph->abProtocolDataStructure, len);
+    s->ulProtocolDataStructureSize = len;
+    DPRINTF("%s: using len %d\n", __func__, len);
+}
+
+/* must be 5 bytes for T=0, 7 bytes for T=1
+ * See page 52 */
+static const uint8_t abDefaultProtocolDataStructure[7] =
+    { 0x77, 0x00, 0x00, 0x00, 0x00, 0xfe /*IFSC*/, 0x00 /*NAD*/ };
+
+static void ccid_reset_parameters(USBCCIDState *s)
+{
+   uint32_t len = sizeof(abDefaultProtocolDataStructure);
+
+   s->bProtocolNum = 1; /* T=1 */
+   s->ulProtocolDataStructureSize = len;
+   memcpy(s->abProtocolDataStructure, abDefaultProtocolDataStructure, len);
+}
+
+/* NOTE: only a single slot is supported (SLOT_0)
+ */
+static void ccid_on_slot_change(USBCCIDState* s, bool full)
+{
+    /* RDR_to_PC_NotifySlotChange, 6.3.1 page 56
+     */
+    uint8_t current = s->bmSlotICCState;
+    if (full) {
+        s->bmSlotICCState |= SLOT_0_STATE_MASK;
+    } else {
+        s->bmSlotICCState &= ~SLOT_0_STATE_MASK;
+    }
+    if (current != s->bmSlotICCState) {
+        s->bmSlotICCState |= SLOT_0_CHANGED_MASK;
+    }
+    s->notify_slot_change = true;
+}
+
+static void ccid_write_data_block_error(
+    USBCCIDState *s, uint8_t slot, uint8_t seq)
+{
+    ccid_write_data_block(s, slot, seq, NULL, 0);
+}
+
+static void ccid_vscard_send_msg(
+    USBCCIDState *s, VSCMsgType type, reader_id_t reader_id,
+        uint8_t* payload, uint32_t length)
+{
+    VSCMsgHeader scr_msg_header;
+
+    scr_msg_header.type = type;
+    scr_msg_header.reader_id = reader_id;
+    scr_msg_header.length = length;
+    qemu_chr_write(s->cs, (uint8_t*)&scr_msg_header, sizeof(VSCMsgHeader));
+    qemu_chr_write(s->cs, payload, length);
+}
+
+static void ccid_vscard_send_apdu(
+    USBCCIDState *s, uint8_t* apdu, uint32_t length)
+{
+    ccid_vscard_send_msg(s, VSC_APDU, VSCARD_MINIMAL_READER_ID, apdu, length);
+}
+
+static void ccid_vscard_send_error(
+    USBCCIDState *s, reader_id_t reader_id, VSCErrorCode code)
+{
+    VSCMsgError msg = {.code=code};
+
+    ccid_vscard_send_msg(s, VSC_Error, reader_id, (uint8_t*)&msg, sizeof(msg));
+}
+
+static void ccid_vscard_send_init(USBCCIDState *s)
+{
+    VSCMsgInit msg = {.version=VSCARD_VERSION};
+
+    ccid_vscard_send_msg(s, VSC_Init, VSCARD_UNDEFINED_READER_ID,
+                         (uint8_t*)&msg, sizeof(msg));
+}
+
+static void ccid_on_apdu_from_guest(USBCCIDState *s, CCID_XferBlock *recv)
+{
+    if (!s->cs) {
+        printf("usb-ccid: discarding apdu length %d\n", recv->hdr.dwLength);
+        return;
+    }
+    if (ccid_card_status(s) != ICC_STATUS_PRESENT_ACTIVE) {
+        DPRINTF("usb-ccid: not sending apdu to client, no card connected\n");
+        ccid_write_data_block_error(s, recv->hdr.bSlot, recv->hdr.bSeq);
+        return;
+    }
+    DPRINTF("%s: seq %d, len %d\n", __FUNCTION__,
+                recv->hdr.bSeq, recv->hdr.dwLength);
+    ccid_add_pending_answer(s, (CCID_Header*)recv);
+    ccid_vscard_send_apdu(s, recv->abData, recv->hdr.dwLength);
+}
+
+static void ccid_handle_bulk_out(USBCCIDState *s, USBPacket *p)
+{
+    CCID_Header* ccid_header;
+
+    if (p->len + s->bulk_out_pos > s->bulk_out_len) {
+        s->bulk_out_len = MAX(p->len + s->bulk_out_pos, s->bulk_out_len*2);
+        s->bulk_out_data = realloc(s->bulk_out_data, s->bulk_out_len);
+        assert(s->bulk_out_data != NULL);
+    }
+    ccid_header = (CCID_Header*)s->bulk_out_data;
+    memcpy(s->bulk_out_data + s->bulk_out_pos, p->data, p->len);
+    s->bulk_out_pos += p->len;
+    if (p->len == 64) {
+        DPRINTF("usb-ccid: bulk_in: expecting more packets (%d/%d)\n",
+            p->len, ccid_header->dwLength);
+        return;
+    }
+    if (s->bulk_out_pos < 10) {
+        DPRINTF("handle_data: bad USB_TOKEN_OUT length, should be at least 10 bytes\n");
+    } else {
+        DPRINTF("handle_data %x\n", ccid_header->bMessageType);
+        switch (ccid_header->bMessageType) {
+            case CCID_MESSAGE_TYPE_PC_to_RDR_GetSlotStatus:
+                ccid_write_slot_status(s, ccid_header);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOn:
+                /* We need to send an ATR back */
+                DPRINTF("PowerOn: %d\n",
+                    ((CCID_IccPowerOn*)(ccid_header))->bPowerSelect);
+                s->powered = true;
+                ccid_write_data_block_atr(s, ccid_header);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_IccPowerOff:
+                DPRINTF("PowerOff\n");
+                ccid_reset_error_status(s);
+                s->powered = false;
+                ccid_write_slot_status(s, ccid_header);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_XfrBlock:
+                ccid_on_apdu_from_guest(s, (CCID_XferBlock*)s->bulk_out_data);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_SetParameters:
+                s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+                ccid_set_parameters(s, ccid_header);
+                ccid_write_parameters(s, ccid_header);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_ResetParameters:
+                s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+                ccid_reset_parameters(s);
+                ccid_write_parameters(s, ccid_header);
+                break;
+            case CCID_MESSAGE_TYPE_PC_to_RDR_GetParameters:
+                s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+                ccid_write_parameters(s, ccid_header);
+                break;
+            default:
+                DPRINTF("handle_data: ERROR: unhandled message type %Xh\n",
+                    ccid_header->bMessageType);
+                /* the caller is expecting the device to respond, tell it we
+                 * do't support the operation */
+                s->bmCommandStatus = COMMAND_STATUS_FAILED;
+                s->bError = ERROR_CMD_NOT_SUPPORTED;
+                ccid_write_slot_status(s, ccid_header);
+                break;
+        }
+    }
+    s->bulk_out_pos = 0;
+}
+
+static int ccid_bulk_in_copy_out(USBCCIDState *s, uint8_t *data, int len)
+{
+    int ret = 0;
+
+    assert(len>0);
+    ccid_bulk_in_get(s);
+    if (s->current_bulk_in != NULL) {
+        ret = MIN(s->current_bulk_in->len - s->current_bulk_in->pos, len);
+        memcpy(data, s->current_bulk_in->data + s->current_bulk_in->pos, ret);
+        s->current_bulk_in->pos += ret;
+        if (s->current_bulk_in->pos == s->current_bulk_in->len) {
+            ccid_bulk_in_release(s);
+        }
+    } else {
+        ret = USB_RET_NAK;
+    }
+    DPRINTF("%s: %d/%d req/act to guest (BULK_IN)\n", __func__, len, ret);
+    return ret;
+}
+
+static int ccid_handle_data(USBDevice *dev, USBPacket *p)
+{
+    USBCCIDState *s = (USBCCIDState *)dev;
+    int ret = 0;
+    uint8_t *data = p->data;
+    int len = p->len;
+
+    switch (p->pid) {
+    case USB_TOKEN_OUT:
+        ccid_handle_bulk_out(s, p);
+        break;
+
+    case USB_TOKEN_IN:
+        switch (p->devep & 0xf) {
+            case CCID_BULK_IN_EP:
+                if (!len) {
+                    ret = USB_RET_NAK;
+                } else {
+                    ret = ccid_bulk_in_copy_out(s, data, len);
+                }
+                break;
+            case CCID_INT_IN_EP:
+                if (s->notify_slot_change) {
+                    /* page 56, RDR_to_PC_NotifySlotChange */
+                    data[0] = CCID_MESSAGE_TYPE_RDR_to_PC_NotifySlotChange;
+                    data[1] = s->bmSlotICCState;
+                    ret = 2;
+                    s->notify_slot_change = false;
+                    s->bmSlotICCState &= ~SLOT_0_CHANGED_MASK;
+                    DPRINTF("handle_data: int_in: notify_slot_change %X\n",
+                            s->bmSlotICCState);
+                }
+                break;
+            default:
+                DPRINTF("Bad endpoint\n");
+                break;
+        }
+        break;
+    default:
+        DPRINTF("Bad token\n");
+        ret = USB_RET_STALL;
+        break;
+    }
+
+    return ret;
+}
+
+static void ccid_handle_destroy(USBDevice *dev)
+{
+    USBCCIDState *s = (USBCCIDState *)dev;
+    bulk_in_t* bulk_in;
+
+    if (s->cs) {
+        qemu_chr_close(s->cs);
+    }
+    free(s->bulk_out_data);
+    free(s->vscard_in_data);
+    ccid_bulk_in_clear(s);
+    QSIMPLEQ_FOREACH(bulk_in, &s->bulk_in_free, entry) {
+        qemu_free(bulk_in->data);
+        qemu_free(bulk_in);
+    }
+}
+
+/* APDU chardev */
+
+static int ccid_vscard_can_read(void *opaque)
+{
+    return 65535;
+}
+
+static void ccid_vscard_handle_message(USBCCIDState *s,
+    VSCMsgHeader* scr_msg_header)
+{
+    uint8_t *data = (uint8_t*)&scr_msg_header[1];
+    answer_t *answer;
+
+    switch (scr_msg_header->type) {
+        case VSC_ATR:
+            DPRINTF("VSC_ATR %d\n", scr_msg_header->length);
+            assert(scr_msg_header->length <= MAX_ATR_SIZE);
+            memcpy(s->atr, data, scr_msg_header->length);
+            s->atr_length = scr_msg_header->length;
+            s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+            if (ccid_has_pending_answers(s)) {
+                ccid_write_data_block_answer(s, NULL, 0);
+            }
+            ccid_on_slot_change(s, true);
+            break;
+        case VSC_APDU:
+            if (!ccid_has_pending_answers(s)) {
+                DPRINTF("VSC_APDU: ERROR: got an APDU without pending answers\n");
+                break;
+            }
+            s->bmCommandStatus = COMMAND_STATUS_NO_ERROR;
+            answer = QSIMPLEQ_FIRST(&s->pending_answers);
+            if (answer == NULL) {
+                abort();
+            }
+            DPRINTF("VSC_APDU %d (answer seq %d, slot %d)\n",
+                scr_msg_header->length,
+                answer->seq, answer->slot);
+            ccid_write_data_block_answer(s, data, scr_msg_header->length);
+            break;
+        case VSC_CardRemove:
+            DPRINTF("VSC_CardRemove\n");
+            ccid_on_slot_change(s, false);
+            if (ccid_has_pending_answers(s)) {
+                ccid_write_data_block_answer(s, NULL, 0);
+            }
+            ccid_reset(s);
+            break;
+        case VSC_Init:
+            break;
+        case VSC_Error:
+            s->bmCommandStatus = COMMAND_STATUS_FAILED;
+            s->last_answer_error = *(uint64_t*)data;
+            DPRINTF("VSC_Error: %lX\n", s->last_answer_error);
+            ccid_write_data_block_answer(s, NULL, 0);
+            break;
+        case VSC_ReaderAdd:
+            DPRINTF("VSC_ReaderAdd\n");
+            if (s->auto_attach==0 && !s->dev.attached) {
+                usb_device_attach(&s->dev);
+                ccid_vscard_send_msg(s, VSC_ReaderAddResponse,
+                                     VSCARD_MINIMAL_READER_ID, NULL, 0);
+            } else {
+                ccid_vscard_send_error(s, VSCARD_UNDEFINED_READER_ID,
+                                          VSC_CANNOT_ADD_MORE_READERS);
+            }
+            break;
+        case VSC_ReaderRemove:
+            DPRINTF("VSC_ReaderRemove\n");
+            if (ccid_card_inserted(s)) {
+                ccid_on_slot_change(s, false);
+                ccid_clear_pending_answers(s);
+            }
+            if (s->auto_attach == 0 && s->dev.attached) {
+                usb_device_detach(&s->dev);
+            }
+            break;
+        default:
+            printf("usb-ccid: chardev: unexpected message of type %X\n",
+                   scr_msg_header->type);
+            ccid_vscard_send_error(s, scr_msg_header->reader_id,
+                VSC_GENERAL_ERROR);
+    }
+}
+
+static void ccid_vscard_read(void *opaque, const uint8_t *buf, int size)
+{
+    USBCCIDState *s = opaque;
+    VSCMsgHeader *hdr;
+
+    if (s->vscard_in_pos + size > s->vscard_in_len) {
+        s->vscard_in_len = MAX(s->vscard_in_pos + size, s->vscard_in_len * 2);
+        s->vscard_in_data = realloc(s->vscard_in_data, s->vscard_in_len);
+        assert(s->vscard_in_data);
+    }
+    memcpy(s->vscard_in_data + s->vscard_in_pos, buf, size);
+    s->vscard_in_pos += size;
+    hdr = (VSCMsgHeader*)(s->vscard_in_data + s->vscard_in_hdr);
+
+    while ((s->vscard_in_pos - s->vscard_in_hdr >= sizeof(VSCMsgHeader)) &&
+        (s->vscard_in_pos - s->vscard_in_hdr - sizeof(VSCMsgHeader) >=
+            hdr->length))
+    {
+        ccid_vscard_handle_message(s, hdr);
+        s->vscard_in_hdr += hdr->length + sizeof(VSCMsgHeader);
+        hdr = (VSCMsgHeader*)(s->vscard_in_data + s->vscard_in_hdr);
+    }
+    if (s->vscard_in_hdr == s->vscard_in_pos) {
+        s->vscard_in_pos = s->vscard_in_hdr = 0;
+    }
+}
+
+static void ccid_vscard_event(void *opaque, int event)
+{
+    USBCCIDState *s = opaque;
+    switch (event) {
+        case CHR_EVENT_BREAK:
+            break;
+        case CHR_EVENT_FOCUS:
+            break;
+        case CHR_EVENT_OPENED:
+            DPRINTF("%s: CHR_EVENT_OPENED\n", __func__);
+            ccid_detach(s);
+            break;
+    }
+}
+
+static int ccid_initfn(USBDevice *dev)
+{
+    USBCCIDState *s = DO_UPCAST(USBCCIDState, dev, dev);
+    int i;
+    bulk_in_t* bulk_in;
+
+    debug = s->debug;
+    dev->auto_attach = s->auto_attach;
+    s->dev.speed = USB_SPEED_FULL;
+    s->notify_slot_change = false;
+    s->powered = true;
+    QSIMPLEQ_INIT(&s->pending_answers);
+    s->last_answer_error = 0;
+    QSIMPLEQ_INIT(&s->bulk_in_pending);
+    QSIMPLEQ_INIT(&s->bulk_in_free);
+    for (i = 0 ; i < BULK_IN_FREE_START_NUM ; ++i) {
+        bulk_in = qemu_mallocz(sizeof(bulk_in_t));
+        bulk_in->data = qemu_mallocz(RECV_BUF);
+        bulk_in->len = RECV_BUF;
+        bulk_in->pos = 0;
+        QSIMPLEQ_INSERT_TAIL(&s->bulk_in_free, bulk_in, entry);
+    }
+    s->current_bulk_in = NULL;
+    ccid_reset_error_status(s);
+    assert(sizeof(DEFAULT_ATR) <= MAX_ATR_SIZE);
+    memcpy(s->atr, DEFAULT_ATR, sizeof(DEFAULT_ATR));
+    s->atr_length = sizeof(DEFAULT_ATR);
+    s->bulk_out_data = malloc(sizeof(VSCMsgHeader));
+    s->bulk_out_len = sizeof(VSCMsgHeader);
+    s->bulk_out_pos = 0;
+    s->vscard_in_data = NULL;
+    s->vscard_in_len = 0;
+    s->vscard_in_pos = 0;
+    s->vscard_in_hdr = 0;
+    if (s->cs) {
+        DPRINTF("initing chardev\n");
+        qemu_chr_add_handlers(s->cs,
+            ccid_vscard_can_read,
+            ccid_vscard_read,
+            ccid_vscard_event, s);
+#ifdef USB_CCID_USE_IOCTL
+        qemu_chr_ioctl(s->cs, CHR_IOCTL_VIRT_SERIAL_OPEN, NULL);
+#endif
+        ccid_vscard_send_init(s);
+    }
+    ccid_reset_parameters(s);
+    ccid_reset(s);
+    return 0;
+}
+
+static struct USBDeviceInfo ccid_info = {
+    .product_desc   = "QEMU USB CCID",
+    .qdev.name      = "usb-ccid",
+    .qdev.size      = sizeof(USBCCIDState),
+    .init           = ccid_initfn,
+    .handle_packet  = usb_generic_handle_packet,
+    .handle_reset   = ccid_handle_reset,
+    .handle_control = ccid_handle_control,
+    .handle_data    = ccid_handle_data,
+    .handle_destroy = ccid_handle_destroy,
+    .usbdevice_name = "ccid",
+    .qdev.props     = (Property[]) {
+        DEFINE_PROP_CHR("chardev",      USBCCIDState, cs),
+        DEFINE_PROP_UINT8("auto_attach", USBCCIDState, auto_attach, 0),
+        DEFINE_PROP_UINT8("debug", USBCCIDState, debug, 0),
+        DEFINE_PROP_END_OF_LIST(),
+    },
+};
+
+static void ccid_register_devices(void)
+{
+    usb_qdev_register(&ccid_info);
+}
+device_init(ccid_register_devices)