hid-debug.c

Go to the documentation of this file.

/*
 *  (c) 1999 Andreas Gal        <[email protected]>
 *  (c) 2000-2001 Vojtech Pavlik    <[email protected]>
 *  (c) 2007-2009 Jiri Kosina
 *
 *  HID debugging support
 */

/*
 * 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
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <[email protected]>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/poll.h>

#include <linux/hid.h>
#include <linux/hid-debug.h>

static struct dentry *hid_debug_root;

struct hid_usage_entry {
    unsigned  page;
    unsigned  usage;
    const char     *description;
};

static const struct hid_usage_entry hid_usage_table[] = {
  {  0,      0, "Undefined" },
  {  1,      0, "GenericDesktop" },
    {0, 0x01, "Pointer"},
    {0, 0x02, "Mouse"},
    {0, 0x04, "Joystick"},
    {0, 0x05, "GamePad"},
    {0, 0x06, "Keyboard"},
    {0, 0x07, "Keypad"},
    {0, 0x08, "MultiAxis"},
      {0, 0x30, "X"},
      {0, 0x31, "Y"},
      {0, 0x32, "Z"},
      {0, 0x33, "Rx"},
      {0, 0x34, "Ry"},
      {0, 0x35, "Rz"},
      {0, 0x36, "Slider"},
      {0, 0x37, "Dial"},
      {0, 0x38, "Wheel"},
      {0, 0x39, "HatSwitch"},
    {0, 0x3a, "CountedBuffer"},
      {0, 0x3b, "ByteCount"},
      {0, 0x3c, "MotionWakeup"},
      {0, 0x3d, "Start"},
      {0, 0x3e, "Select"},
      {0, 0x40, "Vx"},
      {0, 0x41, "Vy"},
      {0, 0x42, "Vz"},
      {0, 0x43, "Vbrx"},
      {0, 0x44, "Vbry"},
      {0, 0x45, "Vbrz"},
      {0, 0x46, "Vno"},
    {0, 0x80, "SystemControl"},
      {0, 0x81, "SystemPowerDown"},
      {0, 0x82, "SystemSleep"},
      {0, 0x83, "SystemWakeUp"},
      {0, 0x84, "SystemContextMenu"},
      {0, 0x85, "SystemMainMenu"},
      {0, 0x86, "SystemAppMenu"},
      {0, 0x87, "SystemMenuHelp"},
      {0, 0x88, "SystemMenuExit"},
      {0, 0x89, "SystemMenuSelect"},
      {0, 0x8a, "SystemMenuRight"},
      {0, 0x8b, "SystemMenuLeft"},
      {0, 0x8c, "SystemMenuUp"},
      {0, 0x8d, "SystemMenuDown"},
      {0, 0x90, "D-PadUp"},
      {0, 0x91, "D-PadDown"},
      {0, 0x92, "D-PadRight"},
      {0, 0x93, "D-PadLeft"},
  {  2, 0, "Simulation" },
      {0, 0xb0, "Aileron"},
      {0, 0xb1, "AileronTrim"},
      {0, 0xb2, "Anti-Torque"},
      {0, 0xb3, "Autopilot"},
      {0, 0xb4, "Chaff"},
      {0, 0xb5, "Collective"},
      {0, 0xb6, "DiveBrake"},
      {0, 0xb7, "ElectronicCountermeasures"},
      {0, 0xb8, "Elevator"},
      {0, 0xb9, "ElevatorTrim"},
      {0, 0xba, "Rudder"},
      {0, 0xbb, "Throttle"},
      {0, 0xbc, "FlightCommunications"},
      {0, 0xbd, "FlareRelease"},
      {0, 0xbe, "LandingGear"},
      {0, 0xbf, "ToeBrake"},
  {  6, 0, "GenericDeviceControls" },
      {0, 0x20, "BatteryStrength" },
      {0, 0x21, "WirelessChannel" },
      {0, 0x22, "WirelessID" },
      {0, 0x23, "DiscoverWirelessControl" },
      {0, 0x24, "SecurityCodeCharacterEntered" },
      {0, 0x25, "SecurityCodeCharactedErased" },
      {0, 0x26, "SecurityCodeCleared" },
  {  7, 0, "Keyboard" },
  {  8, 0, "LED" },
      {0, 0x01, "NumLock"},
      {0, 0x02, "CapsLock"},
      {0, 0x03, "ScrollLock"},
      {0, 0x04, "Compose"},
      {0, 0x05, "Kana"},
      {0, 0x4b, "GenericIndicator"},
  {  9, 0, "Button" },
  { 10, 0, "Ordinal" },
  { 12, 0, "Consumer" },
      {0, 0x238, "HorizontalWheel"},
  { 13, 0, "Digitizers" },
    {0, 0x01, "Digitizer"},
    {0, 0x02, "Pen"},
    {0, 0x03, "LightPen"},
    {0, 0x04, "TouchScreen"},
    {0, 0x05, "TouchPad"},
    {0, 0x20, "Stylus"},
    {0, 0x21, "Puck"},
    {0, 0x22, "Finger"},
    {0, 0x30, "TipPressure"},
    {0, 0x31, "BarrelPressure"},
    {0, 0x32, "InRange"},
    {0, 0x33, "Touch"},
    {0, 0x34, "UnTouch"},
    {0, 0x35, "Tap"},
    {0, 0x39, "TabletFunctionKey"},
    {0, 0x3a, "ProgramChangeKey"},
    {0, 0x3c, "Invert"},
    {0, 0x42, "TipSwitch"},
    {0, 0x43, "SecondaryTipSwitch"},
    {0, 0x44, "BarrelSwitch"},
    {0, 0x45, "Eraser"},
    {0, 0x46, "TabletPick"},
    {0, 0x47, "Confidence"},
    {0, 0x48, "Width"},
    {0, 0x49, "Height"},
    {0, 0x51, "ContactID"},
    {0, 0x52, "InputMode"},
    {0, 0x53, "DeviceIndex"},
    {0, 0x54, "ContactCount"},
    {0, 0x55, "ContactMaximumNumber"},
  { 15, 0, "PhysicalInterfaceDevice" },
    {0, 0x00, "Undefined"},
    {0, 0x01, "Physical_Interface_Device"},
      {0, 0x20, "Normal"},
    {0, 0x21, "Set_Effect_Report"},
      {0, 0x22, "Effect_Block_Index"},
      {0, 0x23, "Parameter_Block_Offset"},
      {0, 0x24, "ROM_Flag"},
      {0, 0x25, "Effect_Type"},
        {0, 0x26, "ET_Constant_Force"},
        {0, 0x27, "ET_Ramp"},
        {0, 0x28, "ET_Custom_Force_Data"},
        {0, 0x30, "ET_Square"},
        {0, 0x31, "ET_Sine"},
        {0, 0x32, "ET_Triangle"},
        {0, 0x33, "ET_Sawtooth_Up"},
        {0, 0x34, "ET_Sawtooth_Down"},
        {0, 0x40, "ET_Spring"},
        {0, 0x41, "ET_Damper"},
        {0, 0x42, "ET_Inertia"},
        {0, 0x43, "ET_Friction"},
      {0, 0x50, "Duration"},
      {0, 0x51, "Sample_Period"},
      {0, 0x52, "Gain"},
      {0, 0x53, "Trigger_Button"},
      {0, 0x54, "Trigger_Repeat_Interval"},
      {0, 0x55, "Axes_Enable"},
        {0, 0x56, "Direction_Enable"},
      {0, 0x57, "Direction"},
      {0, 0x58, "Type_Specific_Block_Offset"},
        {0, 0x59, "Block_Type"},
        {0, 0x5A, "Set_Envelope_Report"},
          {0, 0x5B, "Attack_Level"},
          {0, 0x5C, "Attack_Time"},
          {0, 0x5D, "Fade_Level"},
          {0, 0x5E, "Fade_Time"},
        {0, 0x5F, "Set_Condition_Report"},
        {0, 0x60, "CP_Offset"},
        {0, 0x61, "Positive_Coefficient"},
        {0, 0x62, "Negative_Coefficient"},
        {0, 0x63, "Positive_Saturation"},
        {0, 0x64, "Negative_Saturation"},
        {0, 0x65, "Dead_Band"},
      {0, 0x66, "Download_Force_Sample"},
      {0, 0x67, "Isoch_Custom_Force_Enable"},
      {0, 0x68, "Custom_Force_Data_Report"},
        {0, 0x69, "Custom_Force_Data"},
        {0, 0x6A, "Custom_Force_Vendor_Defined_Data"},
      {0, 0x6B, "Set_Custom_Force_Report"},
        {0, 0x6C, "Custom_Force_Data_Offset"},
        {0, 0x6D, "Sample_Count"},
      {0, 0x6E, "Set_Periodic_Report"},
        {0, 0x6F, "Offset"},
        {0, 0x70, "Magnitude"},
        {0, 0x71, "Phase"},
        {0, 0x72, "Period"},
      {0, 0x73, "Set_Constant_Force_Report"},
        {0, 0x74, "Set_Ramp_Force_Report"},
        {0, 0x75, "Ramp_Start"},
        {0, 0x76, "Ramp_End"},
      {0, 0x77, "Effect_Operation_Report"},
        {0, 0x78, "Effect_Operation"},
          {0, 0x79, "Op_Effect_Start"},
          {0, 0x7A, "Op_Effect_Start_Solo"},
          {0, 0x7B, "Op_Effect_Stop"},
          {0, 0x7C, "Loop_Count"},
      {0, 0x7D, "Device_Gain_Report"},
        {0, 0x7E, "Device_Gain"},
    {0, 0x7F, "PID_Pool_Report"},
      {0, 0x80, "RAM_Pool_Size"},
      {0, 0x81, "ROM_Pool_Size"},
      {0, 0x82, "ROM_Effect_Block_Count"},
      {0, 0x83, "Simultaneous_Effects_Max"},
      {0, 0x84, "Pool_Alignment"},
    {0, 0x85, "PID_Pool_Move_Report"},
      {0, 0x86, "Move_Source"},
      {0, 0x87, "Move_Destination"},
      {0, 0x88, "Move_Length"},
    {0, 0x89, "PID_Block_Load_Report"},
      {0, 0x8B, "Block_Load_Status"},
      {0, 0x8C, "Block_Load_Success"},
      {0, 0x8D, "Block_Load_Full"},
      {0, 0x8E, "Block_Load_Error"},
      {0, 0x8F, "Block_Handle"},
      {0, 0x90, "PID_Block_Free_Report"},
      {0, 0x91, "Type_Specific_Block_Handle"},
    {0, 0x92, "PID_State_Report"},
      {0, 0x94, "Effect_Playing"},
      {0, 0x95, "PID_Device_Control_Report"},
        {0, 0x96, "PID_Device_Control"},
        {0, 0x97, "DC_Enable_Actuators"},
        {0, 0x98, "DC_Disable_Actuators"},
        {0, 0x99, "DC_Stop_All_Effects"},
        {0, 0x9A, "DC_Device_Reset"},
        {0, 0x9B, "DC_Device_Pause"},
        {0, 0x9C, "DC_Device_Continue"},
      {0, 0x9F, "Device_Paused"},
      {0, 0xA0, "Actuators_Enabled"},
      {0, 0xA4, "Safety_Switch"},
      {0, 0xA5, "Actuator_Override_Switch"},
      {0, 0xA6, "Actuator_Power"},
    {0, 0xA7, "Start_Delay"},
    {0, 0xA8, "Parameter_Block_Size"},
    {0, 0xA9, "Device_Managed_Pool"},
    {0, 0xAA, "Shared_Parameter_Blocks"},
    {0, 0xAB, "Create_New_Effect_Report"},
    {0, 0xAC, "RAM_Pool_Available"},
  { 0x84, 0, "Power Device" },
    { 0x84, 0x02, "PresentStatus" },
    { 0x84, 0x03, "ChangeStatus" },
    { 0x84, 0x04, "UPS" },
    { 0x84, 0x05, "PowerSupply" },
    { 0x84, 0x10, "BatterySystem" },
    { 0x84, 0x11, "BatterySystemID" },
    { 0x84, 0x12, "Battery" },
    { 0x84, 0x13, "BatteryID" },
    { 0x84, 0x14, "Charger" },
    { 0x84, 0x15, "ChargerID" },
    { 0x84, 0x16, "PowerConverter" },
    { 0x84, 0x17, "PowerConverterID" },
    { 0x84, 0x18, "OutletSystem" },
    { 0x84, 0x19, "OutletSystemID" },
    { 0x84, 0x1a, "Input" },
    { 0x84, 0x1b, "InputID" },
    { 0x84, 0x1c, "Output" },
    { 0x84, 0x1d, "OutputID" },
    { 0x84, 0x1e, "Flow" },
    { 0x84, 0x1f, "FlowID" },
    { 0x84, 0x20, "Outlet" },
    { 0x84, 0x21, "OutletID" },
    { 0x84, 0x22, "Gang" },
    { 0x84, 0x24, "PowerSummary" },
    { 0x84, 0x25, "PowerSummaryID" },
    { 0x84, 0x30, "Voltage" },
    { 0x84, 0x31, "Current" },
    { 0x84, 0x32, "Frequency" },
    { 0x84, 0x33, "ApparentPower" },
    { 0x84, 0x35, "PercentLoad" },
    { 0x84, 0x40, "ConfigVoltage" },
    { 0x84, 0x41, "ConfigCurrent" },
    { 0x84, 0x43, "ConfigApparentPower" },
    { 0x84, 0x53, "LowVoltageTransfer" },
    { 0x84, 0x54, "HighVoltageTransfer" },
    { 0x84, 0x56, "DelayBeforeStartup" },
    { 0x84, 0x57, "DelayBeforeShutdown" },
    { 0x84, 0x58, "Test" },
    { 0x84, 0x5a, "AudibleAlarmControl" },
    { 0x84, 0x60, "Present" },
    { 0x84, 0x61, "Good" },
    { 0x84, 0x62, "InternalFailure" },
    { 0x84, 0x65, "Overload" },
    { 0x84, 0x66, "OverCharged" },
    { 0x84, 0x67, "OverTemperature" },
    { 0x84, 0x68, "ShutdownRequested" },
    { 0x84, 0x69, "ShutdownImminent" },
    { 0x84, 0x6b, "SwitchOn/Off" },
    { 0x84, 0x6c, "Switchable" },
    { 0x84, 0x6d, "Used" },
    { 0x84, 0x6e, "Boost" },
    { 0x84, 0x73, "CommunicationLost" },
    { 0x84, 0xfd, "iManufacturer" },
    { 0x84, 0xfe, "iProduct" },
    { 0x84, 0xff, "iSerialNumber" },
  { 0x85, 0, "Battery System" },
    { 0x85, 0x01, "SMBBatteryMode" },
    { 0x85, 0x02, "SMBBatteryStatus" },
    { 0x85, 0x03, "SMBAlarmWarning" },
    { 0x85, 0x04, "SMBChargerMode" },
    { 0x85, 0x05, "SMBChargerStatus" },
    { 0x85, 0x06, "SMBChargerSpecInfo" },
    { 0x85, 0x07, "SMBSelectorState" },
    { 0x85, 0x08, "SMBSelectorPresets" },
    { 0x85, 0x09, "SMBSelectorInfo" },
    { 0x85, 0x29, "RemainingCapacityLimit" },
    { 0x85, 0x2c, "CapacityMode" },
    { 0x85, 0x42, "BelowRemainingCapacityLimit" },
    { 0x85, 0x44, "Charging" },
    { 0x85, 0x45, "Discharging" },
    { 0x85, 0x4b, "NeedReplacement" },
    { 0x85, 0x66, "RemainingCapacity" },
    { 0x85, 0x68, "RunTimeToEmpty" },
    { 0x85, 0x6a, "AverageTimeToFull" },
    { 0x85, 0x83, "DesignCapacity" },
    { 0x85, 0x85, "ManufacturerDate" },
    { 0x85, 0x89, "iDeviceChemistry" },
    { 0x85, 0x8b, "Rechargeable" },
    { 0x85, 0x8f, "iOEMInformation" },
    { 0x85, 0x8d, "CapacityGranularity1" },
    { 0x85, 0xd0, "ACPresent" },
  /* pages 0xff00 to 0xffff are vendor-specific */
  { 0xffff, 0, "Vendor-specific-FF" },
  { 0, 0, NULL }
};

/* Either output directly into simple seq_file, or (if f == NULL)
 * allocate a separate buffer that will then be passed to the 'events'
 * ringbuffer.
 *
 * This is because these functions can be called both for "one-shot"
 * "rdesc" while resolving, or for blocking "events".
 *
 * This holds both for resolv_usage_page() and hid_resolv_usage().
 */
static char *resolv_usage_page(unsigned page, struct seq_file *f) {
    const struct hid_usage_entry *p;
    char *buf = NULL;

    if (!f) {
        buf = kzalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_ATOMIC);
        if (!buf)
            return ERR_PTR(-ENOMEM);
    }

    for (p = hid_usage_table; p->description; p++)
        if (p->page == page) {
            if (!f) {
                snprintf(buf, HID_DEBUG_BUFSIZE, "%s",
                        p->description);
                return buf;
            }
            else {
                seq_printf(f, "%s", p->description);
                return NULL;
            }
        }
    if (!f)
        snprintf(buf, HID_DEBUG_BUFSIZE, "%04x", page);
    else
        seq_printf(f, "%04x", page);
    return buf;
}

char *hid_resolv_usage(unsigned usage, struct seq_file *f) {
    const struct hid_usage_entry *p;
    char *buf = NULL;
    int len = 0;

    buf = resolv_usage_page(usage >> 16, f);
    if (IS_ERR(buf)) {
        pr_err("error allocating HID debug buffer\n");
        return NULL;
    }


    if (!f) {
        len = strlen(buf);
        snprintf(buf+len, max(0, HID_DEBUG_BUFSIZE - len), ".");
        len++;
    }
    else {
        seq_printf(f, ".");
    }
    for (p = hid_usage_table; p->description; p++)
        if (p->page == (usage >> 16)) {
            for(++p; p->description && p->usage != 0; p++)
                if (p->usage == (usage & 0xffff)) {
                    if (!f)
                        snprintf(buf + len,
                            max(0,HID_DEBUG_BUFSIZE - len - 1),
                            "%s", p->description);
                    else
                        seq_printf(f,
                            "%s",
                            p->description);
                    return buf;
                }
            break;
        }
    if (!f)
        snprintf(buf + len, max(0, HID_DEBUG_BUFSIZE - len - 1),
                "%04x", usage & 0xffff);
    else
        seq_printf(f, "%04x", usage & 0xffff);
    return buf;
}
EXPORT_SYMBOL_GPL(hid_resolv_usage);

static void tab(int n, struct seq_file *f) {
    seq_printf(f, "%*s", n, "");
}

void hid_dump_field(struct hid_field *field, int n, struct seq_file *f) {
    int j;

    if (field->physical) {
        tab(n, f);
        seq_printf(f, "Physical(");
        hid_resolv_usage(field->physical, f); seq_printf(f, ")\n");
    }
    if (field->logical) {
        tab(n, f);
        seq_printf(f, "Logical(");
        hid_resolv_usage(field->logical, f); seq_printf(f, ")\n");
    }
    if (field->application) {
        tab(n, f);
        seq_printf(f, "Application(");
        hid_resolv_usage(field->application, f); seq_printf(f, ")\n");
    }
    tab(n, f); seq_printf(f, "Usage(%d)\n", field->maxusage);
    for (j = 0; j < field->maxusage; j++) {
        tab(n+2, f); hid_resolv_usage(field->usage[j].hid, f); seq_printf(f, "\n");
    }
    if (field->logical_minimum != field->logical_maximum) {
        tab(n, f); seq_printf(f, "Logical Minimum(%d)\n", field->logical_minimum);
        tab(n, f); seq_printf(f, "Logical Maximum(%d)\n", field->logical_maximum);
    }
    if (field->physical_minimum != field->physical_maximum) {
        tab(n, f); seq_printf(f, "Physical Minimum(%d)\n", field->physical_minimum);
        tab(n, f); seq_printf(f, "Physical Maximum(%d)\n", field->physical_maximum);
    }
    if (field->unit_exponent) {
        tab(n, f); seq_printf(f, "Unit Exponent(%d)\n", field->unit_exponent);
    }
    if (field->unit) {
        static const char *systems[5] = { "None", "SI Linear", "SI Rotation", "English Linear", "English Rotation" };
        static const char *units[5][8] = {
            { "None", "None", "None", "None", "None", "None", "None", "None" },
            { "None", "Centimeter", "Gram", "Seconds", "Kelvin",     "Ampere", "Candela", "None" },
            { "None", "Radians",    "Gram", "Seconds", "Kelvin",     "Ampere", "Candela", "None" },
            { "None", "Inch",       "Slug", "Seconds", "Fahrenheit", "Ampere", "Candela", "None" },
            { "None", "Degrees",    "Slug", "Seconds", "Fahrenheit", "Ampere", "Candela", "None" }
        };

        int i;
        int sys;
                __u32 data = field->unit;

        /* First nibble tells us which system we're in. */
        sys = data & 0xf;
        data >>= 4;

        if(sys > 4) {
            tab(n, f); seq_printf(f, "Unit(Invalid)\n");
        }
        else {
            int earlier_unit = 0;

            tab(n, f); seq_printf(f, "Unit(%s : ", systems[sys]);

            for (i=1 ; i<sizeof(__u32)*2 ; i++) {
                char nibble = data & 0xf;
                data >>= 4;
                if (nibble != 0) {
                    if(earlier_unit++ > 0)
                        seq_printf(f, "*");
                    seq_printf(f, "%s", units[sys][i]);
                    if(nibble != 1) {
                        /* This is a _signed_ nibble(!) */

                        int val = nibble & 0x7;
                        if(nibble & 0x08)
                            val = -((0x7 & ~val) +1);
                        seq_printf(f, "^%d", val);
                    }
                }
            }
            seq_printf(f, ")\n");
        }
    }
    tab(n, f); seq_printf(f, "Report Size(%u)\n", field->report_size);
    tab(n, f); seq_printf(f, "Report Count(%u)\n", field->report_count);
    tab(n, f); seq_printf(f, "Report Offset(%u)\n", field->report_offset);

    tab(n, f); seq_printf(f, "Flags( ");
    j = field->flags;
    seq_printf(f, "%s", HID_MAIN_ITEM_CONSTANT & j ? "Constant " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_VARIABLE & j ? "Variable " : "Array ");
    seq_printf(f, "%s", HID_MAIN_ITEM_RELATIVE & j ? "Relative " : "Absolute ");
    seq_printf(f, "%s", HID_MAIN_ITEM_WRAP & j ? "Wrap " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_NONLINEAR & j ? "NonLinear " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_NO_PREFERRED & j ? "NoPreferredState " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_NULL_STATE & j ? "NullState " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_VOLATILE & j ? "Volatile " : "");
    seq_printf(f, "%s", HID_MAIN_ITEM_BUFFERED_BYTE & j ? "BufferedByte " : "");
    seq_printf(f, ")\n");
}
EXPORT_SYMBOL_GPL(hid_dump_field);

void hid_dump_device(struct hid_device *device, struct seq_file *f)
{
    struct hid_report_enum *report_enum;
    struct hid_report *report;
    struct list_head *list;
    unsigned i,k;
    static const char *table[] = {"INPUT", "OUTPUT", "FEATURE"};

    for (i = 0; i < HID_REPORT_TYPES; i++) {
        report_enum = device->report_enum + i;
        list = report_enum->report_list.next;
        while (list != &report_enum->report_list) {
            report = (struct hid_report *) list;
            tab(2, f);
            seq_printf(f, "%s", table[i]);
            if (report->id)
                seq_printf(f, "(%d)", report->id);
            seq_printf(f, "[%s]", table[report->type]);
            seq_printf(f, "\n");
            for (k = 0; k < report->maxfield; k++) {
                tab(4, f);
                seq_printf(f, "Field(%d)\n", k);
                hid_dump_field(report->field[k], 6, f);
            }
            list = list->next;
        }
    }
}
EXPORT_SYMBOL_GPL(hid_dump_device);

/* enqueue string to 'events' ring buffer */
void hid_debug_event(struct hid_device *hdev, char *buf)
{
    int i;
    struct hid_debug_list *list;

    list_for_each_entry(list, &hdev->debug_list, node) {
        for (i = 0; i < strlen(buf); i++)
            list->hid_debug_buf[(list->tail + i) % HID_DEBUG_BUFSIZE] =
                buf[i];
        list->tail = (list->tail + i) % HID_DEBUG_BUFSIZE;
        }

    wake_up_interruptible(&hdev->debug_wait);
}
EXPORT_SYMBOL_GPL(hid_debug_event);

void hid_dump_input(struct hid_device *hdev, struct hid_usage *usage, __s32 value)
{
    char *buf;
    int len;

    buf = hid_resolv_usage(usage->hid, NULL);
    if (!buf)
        return;
    len = strlen(buf);
    snprintf(buf + len, HID_DEBUG_BUFSIZE - len - 1, " = %d\n", value);

    hid_debug_event(hdev, buf);

    kfree(buf);
        wake_up_interruptible(&hdev->debug_wait);

}
EXPORT_SYMBOL_GPL(hid_dump_input);

static const char *events[EV_MAX + 1] = {
    [EV_SYN] = "Sync",          [EV_KEY] = "Key",
    [EV_REL] = "Relative",          [EV_ABS] = "Absolute",
    [EV_MSC] = "Misc",          [EV_LED] = "LED",
    [EV_SND] = "Sound",         [EV_REP] = "Repeat",
    [EV_FF] = "ForceFeedback",      [EV_PWR] = "Power",
    [EV_FF_STATUS] = "ForceFeedbackStatus",
};

static const char *syncs[3] = {
    [SYN_REPORT] = "Report",        [SYN_CONFIG] = "Config",
    [SYN_MT_REPORT] = "MT Report",
};

static const char *keys[KEY_MAX + 1] = {
    [KEY_RESERVED] = "Reserved",        [KEY_ESC] = "Esc",
    [KEY_1] = "1",              [KEY_2] = "2",
    [KEY_3] = "3",              [KEY_4] = "4",
    [KEY_5] = "5",              [KEY_6] = "6",
    [KEY_7] = "7",              [KEY_8] = "8",
    [KEY_9] = "9",              [KEY_0] = "0",
    [KEY_MINUS] = "Minus",          [KEY_EQUAL] = "Equal",
    [KEY_BACKSPACE] = "Backspace",      [KEY_TAB] = "Tab",
    [KEY_Q] = "Q",              [KEY_W] = "W",
    [KEY_E] = "E",              [KEY_R] = "R",
    [KEY_T] = "T",              [KEY_Y] = "Y",
    [KEY_U] = "U",              [KEY_I] = "I",
    [KEY_O] = "O",              [KEY_P] = "P",
    [KEY_LEFTBRACE] = "LeftBrace",      [KEY_RIGHTBRACE] = "RightBrace",
    [KEY_ENTER] = "Enter",          [KEY_LEFTCTRL] = "LeftControl",
    [KEY_A] = "A",              [KEY_S] = "S",
    [KEY_D] = "D",              [KEY_F] = "F",
    [KEY_G] = "G",              [KEY_H] = "H",
    [KEY_J] = "J",              [KEY_K] = "K",
    [KEY_L] = "L",              [KEY_SEMICOLON] = "Semicolon",
    [KEY_APOSTROPHE] = "Apostrophe",    [KEY_GRAVE] = "Grave",
    [KEY_LEFTSHIFT] = "LeftShift",      [KEY_BACKSLASH] = "BackSlash",
    [KEY_Z] = "Z",              [KEY_X] = "X",
    [KEY_C] = "C",              [KEY_V] = "V",
    [KEY_B] = "B",              [KEY_N] = "N",
    [KEY_M] = "M",              [KEY_COMMA] = "Comma",
    [KEY_DOT] = "Dot",          [KEY_SLASH] = "Slash",
    [KEY_RIGHTSHIFT] = "RightShift",    [KEY_KPASTERISK] = "KPAsterisk",
    [KEY_LEFTALT] = "LeftAlt",      [KEY_SPACE] = "Space",
    [KEY_CAPSLOCK] = "CapsLock",        [KEY_F1] = "F1",
    [KEY_F2] = "F2",            [KEY_F3] = "F3",
    [KEY_F4] = "F4",            [KEY_F5] = "F5",
    [KEY_F6] = "F6",            [KEY_F7] = "F7",
    [KEY_F8] = "F8",            [KEY_F9] = "F9",
    [KEY_F10] = "F10",          [KEY_NUMLOCK] = "NumLock",
    [KEY_SCROLLLOCK] = "ScrollLock",    [KEY_KP7] = "KP7",
    [KEY_KP8] = "KP8",          [KEY_KP9] = "KP9",
    [KEY_KPMINUS] = "KPMinus",      [KEY_KP4] = "KP4",
    [KEY_KP5] = "KP5",          [KEY_KP6] = "KP6",
    [KEY_KPPLUS] = "KPPlus",        [KEY_KP1] = "KP1",
    [KEY_KP2] = "KP2",          [KEY_KP3] = "KP3",
    [KEY_KP0] = "KP0",          [KEY_KPDOT] = "KPDot",
    [KEY_ZENKAKUHANKAKU] = "Zenkaku/Hankaku", [KEY_102ND] = "102nd",
    [KEY_F11] = "F11",          [KEY_F12] = "F12",
    [KEY_RO] = "RO",            [KEY_KATAKANA] = "Katakana",
    [KEY_HIRAGANA] = "HIRAGANA",        [KEY_HENKAN] = "Henkan",
    [KEY_KATAKANAHIRAGANA] = "Katakana/Hiragana", [KEY_MUHENKAN] = "Muhenkan",
    [KEY_KPJPCOMMA] = "KPJpComma",      [KEY_KPENTER] = "KPEnter",
    [KEY_RIGHTCTRL] = "RightCtrl",      [KEY_KPSLASH] = "KPSlash",
    [KEY_SYSRQ] = "SysRq",          [KEY_RIGHTALT] = "RightAlt",
    [KEY_LINEFEED] = "LineFeed",        [KEY_HOME] = "Home",
    [KEY_UP] = "Up",            [KEY_PAGEUP] = "PageUp",
    [KEY_LEFT] = "Left",            [KEY_RIGHT] = "Right",
    [KEY_END] = "End",          [KEY_DOWN] = "Down",
    [KEY_PAGEDOWN] = "PageDown",        [KEY_INSERT] = "Insert",
    [KEY_DELETE] = "Delete",        [KEY_MACRO] = "Macro",
    [KEY_MUTE] = "Mute",            [KEY_VOLUMEDOWN] = "VolumeDown",
    [KEY_VOLUMEUP] = "VolumeUp",        [KEY_POWER] = "Power",
    [KEY_KPEQUAL] = "KPEqual",      [KEY_KPPLUSMINUS] = "KPPlusMinus",
    [KEY_PAUSE] = "Pause",          [KEY_KPCOMMA] = "KPComma",
    [KEY_HANGUEL] = "Hangeul",      [KEY_HANJA] = "Hanja",
    [KEY_YEN] = "Yen",          [KEY_LEFTMETA] = "LeftMeta",
    [KEY_RIGHTMETA] = "RightMeta",      [KEY_COMPOSE] = "Compose",
    [KEY_STOP] = "Stop",            [KEY_AGAIN] = "Again",
    [KEY_PROPS] = "Props",          [KEY_UNDO] = "Undo",
    [KEY_FRONT] = "Front",          [KEY_COPY] = "Copy",
    [KEY_OPEN] = "Open",            [KEY_PASTE] = "Paste",
    [KEY_FIND] = "Find",            [KEY_CUT] = "Cut",
    [KEY_HELP] = "Help",            [KEY_MENU] = "Menu",
    [KEY_CALC] = "Calc",            [KEY_SETUP] = "Setup",
    [KEY_SLEEP] = "Sleep",          [KEY_WAKEUP] = "WakeUp",
    [KEY_FILE] = "File",            [KEY_SENDFILE] = "SendFile",
    [KEY_DELETEFILE] = "DeleteFile",    [KEY_XFER] = "X-fer",
    [KEY_PROG1] = "Prog1",          [KEY_PROG2] = "Prog2",
    [KEY_WWW] = "WWW",          [KEY_MSDOS] = "MSDOS",
    [KEY_COFFEE] = "Coffee",        [KEY_DIRECTION] = "Direction",
    [KEY_CYCLEWINDOWS] = "CycleWindows",    [KEY_MAIL] = "Mail",
    [KEY_BOOKMARKS] = "Bookmarks",      [KEY_COMPUTER] = "Computer",
    [KEY_BACK] = "Back",            [KEY_FORWARD] = "Forward",
    [KEY_CLOSECD] = "CloseCD",      [KEY_EJECTCD] = "EjectCD",
    [KEY_EJECTCLOSECD] = "EjectCloseCD",    [KEY_NEXTSONG] = "NextSong",
    [KEY_PLAYPAUSE] = "PlayPause",      [KEY_PREVIOUSSONG] = "PreviousSong",
    [KEY_STOPCD] = "StopCD",        [KEY_RECORD] = "Record",
    [KEY_REWIND] = "Rewind",        [KEY_PHONE] = "Phone",
    [KEY_ISO] = "ISOKey",           [KEY_CONFIG] = "Config",
    [KEY_HOMEPAGE] = "HomePage",        [KEY_REFRESH] = "Refresh",
    [KEY_EXIT] = "Exit",            [KEY_MOVE] = "Move",
    [KEY_EDIT] = "Edit",            [KEY_SCROLLUP] = "ScrollUp",
    [KEY_SCROLLDOWN] = "ScrollDown",    [KEY_KPLEFTPAREN] = "KPLeftParenthesis",
    [KEY_KPRIGHTPAREN] = "KPRightParenthesis", [KEY_NEW] = "New",
    [KEY_REDO] = "Redo",            [KEY_F13] = "F13",
    [KEY_F14] = "F14",          [KEY_F15] = "F15",
    [KEY_F16] = "F16",          [KEY_F17] = "F17",
    [KEY_F18] = "F18",          [KEY_F19] = "F19",
    [KEY_F20] = "F20",          [KEY_F21] = "F21",
    [KEY_F22] = "F22",          [KEY_F23] = "F23",
    [KEY_F24] = "F24",          [KEY_PLAYCD] = "PlayCD",
    [KEY_PAUSECD] = "PauseCD",      [KEY_PROG3] = "Prog3",
    [KEY_PROG4] = "Prog4",          [KEY_SUSPEND] = "Suspend",
    [KEY_CLOSE] = "Close",          [KEY_PLAY] = "Play",
    [KEY_FASTFORWARD] = "FastForward",  [KEY_BASSBOOST] = "BassBoost",
    [KEY_PRINT] = "Print",          [KEY_HP] = "HP",
    [KEY_CAMERA] = "Camera",        [KEY_SOUND] = "Sound",
    [KEY_QUESTION] = "Question",        [KEY_EMAIL] = "Email",
    [KEY_CHAT] = "Chat",            [KEY_SEARCH] = "Search",
    [KEY_CONNECT] = "Connect",      [KEY_FINANCE] = "Finance",
    [KEY_SPORT] = "Sport",          [KEY_SHOP] = "Shop",
    [KEY_ALTERASE] = "AlternateErase",  [KEY_CANCEL] = "Cancel",
    [KEY_BRIGHTNESSDOWN] = "BrightnessDown", [KEY_BRIGHTNESSUP] = "BrightnessUp",
    [KEY_MEDIA] = "Media",          [KEY_UNKNOWN] = "Unknown",
    [BTN_0] = "Btn0",           [BTN_1] = "Btn1",
    [BTN_2] = "Btn2",           [BTN_3] = "Btn3",
    [BTN_4] = "Btn4",           [BTN_5] = "Btn5",
    [BTN_6] = "Btn6",           [BTN_7] = "Btn7",
    [BTN_8] = "Btn8",           [BTN_9] = "Btn9",
    [BTN_LEFT] = "LeftBtn",         [BTN_RIGHT] = "RightBtn",
    [BTN_MIDDLE] = "MiddleBtn",     [BTN_SIDE] = "SideBtn",
    [BTN_EXTRA] = "ExtraBtn",       [BTN_FORWARD] = "ForwardBtn",
    [BTN_BACK] = "BackBtn",         [BTN_TASK] = "TaskBtn",
    [BTN_TRIGGER] = "Trigger",      [BTN_THUMB] = "ThumbBtn",
    [BTN_THUMB2] = "ThumbBtn2",     [BTN_TOP] = "TopBtn",
    [BTN_TOP2] = "TopBtn2",         [BTN_PINKIE] = "PinkieBtn",
    [BTN_BASE] = "BaseBtn",         [BTN_BASE2] = "BaseBtn2",
    [BTN_BASE3] = "BaseBtn3",       [BTN_BASE4] = "BaseBtn4",
    [BTN_BASE5] = "BaseBtn5",       [BTN_BASE6] = "BaseBtn6",
    [BTN_DEAD] = "BtnDead",         [BTN_A] = "BtnA",
    [BTN_B] = "BtnB",           [BTN_C] = "BtnC",
    [BTN_X] = "BtnX",           [BTN_Y] = "BtnY",
    [BTN_Z] = "BtnZ",           [BTN_TL] = "BtnTL",
    [BTN_TR] = "BtnTR",         [BTN_TL2] = "BtnTL2",
    [BTN_TR2] = "BtnTR2",           [BTN_SELECT] = "BtnSelect",
    [BTN_START] = "BtnStart",       [BTN_MODE] = "BtnMode",
    [BTN_THUMBL] = "BtnThumbL",     [BTN_THUMBR] = "BtnThumbR",
    [BTN_TOOL_PEN] = "ToolPen",     [BTN_TOOL_RUBBER] = "ToolRubber",
    [BTN_TOOL_BRUSH] = "ToolBrush",     [BTN_TOOL_PENCIL] = "ToolPencil",
    [BTN_TOOL_AIRBRUSH] = "ToolAirbrush",   [BTN_TOOL_FINGER] = "ToolFinger",
    [BTN_TOOL_MOUSE] = "ToolMouse",     [BTN_TOOL_LENS] = "ToolLens",
    [BTN_TOUCH] = "Touch",          [BTN_STYLUS] = "Stylus",
    [BTN_STYLUS2] = "Stylus2",      [BTN_TOOL_DOUBLETAP] = "ToolDoubleTap",
    [BTN_TOOL_TRIPLETAP] = "ToolTripleTap", [BTN_GEAR_DOWN] = "WheelBtn",
    [BTN_GEAR_UP] = "Gear up",      [KEY_OK] = "Ok",
    [KEY_SELECT] = "Select",        [KEY_GOTO] = "Goto",
    [KEY_CLEAR] = "Clear",          [KEY_POWER2] = "Power2",
    [KEY_OPTION] = "Option",        [KEY_INFO] = "Info",
    [KEY_TIME] = "Time",            [KEY_VENDOR] = "Vendor",
    [KEY_ARCHIVE] = "Archive",      [KEY_PROGRAM] = "Program",
    [KEY_CHANNEL] = "Channel",      [KEY_FAVORITES] = "Favorites",
    [KEY_EPG] = "EPG",          [KEY_PVR] = "PVR",
    [KEY_MHP] = "MHP",          [KEY_LANGUAGE] = "Language",
    [KEY_TITLE] = "Title",          [KEY_SUBTITLE] = "Subtitle",
    [KEY_ANGLE] = "Angle",          [KEY_ZOOM] = "Zoom",
    [KEY_MODE] = "Mode",            [KEY_KEYBOARD] = "Keyboard",
    [KEY_SCREEN] = "Screen",        [KEY_PC] = "PC",
    [KEY_TV] = "TV",            [KEY_TV2] = "TV2",
    [KEY_VCR] = "VCR",          [KEY_VCR2] = "VCR2",
    [KEY_SAT] = "Sat",          [KEY_SAT2] = "Sat2",
    [KEY_CD] = "CD",            [KEY_TAPE] = "Tape",
    [KEY_RADIO] = "Radio",          [KEY_TUNER] = "Tuner",
    [KEY_PLAYER] = "Player",        [KEY_TEXT] = "Text",
    [KEY_DVD] = "DVD",          [KEY_AUX] = "Aux",
    [KEY_MP3] = "MP3",          [KEY_AUDIO] = "Audio",
    [KEY_VIDEO] = "Video",          [KEY_DIRECTORY] = "Directory",
    [KEY_LIST] = "List",            [KEY_MEMO] = "Memo",
    [KEY_CALENDAR] = "Calendar",        [KEY_RED] = "Red",
    [KEY_GREEN] = "Green",          [KEY_YELLOW] = "Yellow",
    [KEY_BLUE] = "Blue",            [KEY_CHANNELUP] = "ChannelUp",
    [KEY_CHANNELDOWN] = "ChannelDown",  [KEY_FIRST] = "First",
    [KEY_LAST] = "Last",            [KEY_AB] = "AB",
    [KEY_NEXT] = "Next",            [KEY_RESTART] = "Restart",
    [KEY_SLOW] = "Slow",            [KEY_SHUFFLE] = "Shuffle",
    [KEY_BREAK] = "Break",          [KEY_PREVIOUS] = "Previous",
    [KEY_DIGITS] = "Digits",        [KEY_TEEN] = "TEEN",
    [KEY_TWEN] = "TWEN",            [KEY_DEL_EOL] = "DeleteEOL",
    [KEY_DEL_EOS] = "DeleteEOS",        [KEY_INS_LINE] = "InsertLine",
    [KEY_DEL_LINE] = "DeleteLine",
    [KEY_SEND] = "Send",            [KEY_REPLY] = "Reply",
    [KEY_FORWARDMAIL] = "ForwardMail",  [KEY_SAVE] = "Save",
    [KEY_DOCUMENTS] = "Documents",      [KEY_SPELLCHECK] = "SpellCheck",
    [KEY_LOGOFF] = "Logoff",
    [KEY_FN] = "Fn",            [KEY_FN_ESC] = "Fn+ESC",
    [KEY_FN_1] = "Fn+1",            [KEY_FN_2] = "Fn+2",
    [KEY_FN_B] = "Fn+B",            [KEY_FN_D] = "Fn+D",
    [KEY_FN_E] = "Fn+E",            [KEY_FN_F] = "Fn+F",
    [KEY_FN_S] = "Fn+S",
    [KEY_FN_F1] = "Fn+F1",          [KEY_FN_F2] = "Fn+F2",
    [KEY_FN_F3] = "Fn+F3",          [KEY_FN_F4] = "Fn+F4",
    [KEY_FN_F5] = "Fn+F5",          [KEY_FN_F6] = "Fn+F6",
    [KEY_FN_F7] = "Fn+F7",          [KEY_FN_F8] = "Fn+F8",
    [KEY_FN_F9] = "Fn+F9",          [KEY_FN_F10] = "Fn+F10",
    [KEY_FN_F11] = "Fn+F11",        [KEY_FN_F12] = "Fn+F12",
    [KEY_KBDILLUMTOGGLE] = "KbdIlluminationToggle",
    [KEY_KBDILLUMDOWN] = "KbdIlluminationDown",
    [KEY_KBDILLUMUP] = "KbdIlluminationUp",
    [KEY_SWITCHVIDEOMODE] = "SwitchVideoMode",
};

static const char *relatives[REL_MAX + 1] = {
    [REL_X] = "X",          [REL_Y] = "Y",
    [REL_Z] = "Z",          [REL_RX] = "Rx",
    [REL_RY] = "Ry",        [REL_RZ] = "Rz",
    [REL_HWHEEL] = "HWheel",    [REL_DIAL] = "Dial",
    [REL_WHEEL] = "Wheel",      [REL_MISC] = "Misc",
};

static const char *absolutes[ABS_CNT] = {
    [ABS_X] = "X",          [ABS_Y] = "Y",
    [ABS_Z] = "Z",          [ABS_RX] = "Rx",
    [ABS_RY] = "Ry",        [ABS_RZ] = "Rz",
    [ABS_THROTTLE] = "Throttle",    [ABS_RUDDER] = "Rudder",
    [ABS_WHEEL] = "Wheel",      [ABS_GAS] = "Gas",
    [ABS_BRAKE] = "Brake",      [ABS_HAT0X] = "Hat0X",
    [ABS_HAT0Y] = "Hat0Y",      [ABS_HAT1X] = "Hat1X",
    [ABS_HAT1Y] = "Hat1Y",      [ABS_HAT2X] = "Hat2X",
    [ABS_HAT2Y] = "Hat2Y",      [ABS_HAT3X] = "Hat3X",
    [ABS_HAT3Y] = "Hat 3Y",     [ABS_PRESSURE] = "Pressure",
    [ABS_DISTANCE] = "Distance",    [ABS_TILT_X] = "XTilt",
    [ABS_TILT_Y] = "YTilt",     [ABS_TOOL_WIDTH] = "ToolWidth",
    [ABS_VOLUME] = "Volume",    [ABS_MISC] = "Misc",
    [ABS_MT_TOUCH_MAJOR] = "MTMajor",
    [ABS_MT_TOUCH_MINOR] = "MTMinor",
    [ABS_MT_WIDTH_MAJOR] = "MTMajorW",
    [ABS_MT_WIDTH_MINOR] = "MTMinorW",
    [ABS_MT_ORIENTATION] = "MTOrientation",
    [ABS_MT_POSITION_X] = "MTPositionX",
    [ABS_MT_POSITION_Y] = "MTPositionY",
    [ABS_MT_TOOL_TYPE] = "MTToolType",
    [ABS_MT_BLOB_ID] = "MTBlobID",
};

static const char *misc[MSC_MAX + 1] = {
    [MSC_SERIAL] = "Serial",    [MSC_PULSELED] = "Pulseled",
    [MSC_GESTURE] = "Gesture",  [MSC_RAW] = "RawData"
};

static const char *leds[LED_MAX + 1] = {
    [LED_NUML] = "NumLock",     [LED_CAPSL] = "CapsLock",
    [LED_SCROLLL] = "ScrollLock",   [LED_COMPOSE] = "Compose",
    [LED_KANA] = "Kana",        [LED_SLEEP] = "Sleep",
    [LED_SUSPEND] = "Suspend",  [LED_MUTE] = "Mute",
    [LED_MISC] = "Misc",
};

static const char *repeats[REP_MAX + 1] = {
    [REP_DELAY] = "Delay",      [REP_PERIOD] = "Period"
};

static const char *sounds[SND_MAX + 1] = {
    [SND_CLICK] = "Click",      [SND_BELL] = "Bell",
    [SND_TONE] = "Tone"
};

static const char **names[EV_MAX + 1] = {
    [EV_SYN] = syncs,           [EV_KEY] = keys,
    [EV_REL] = relatives,           [EV_ABS] = absolutes,
    [EV_MSC] = misc,            [EV_LED] = leds,
    [EV_SND] = sounds,          [EV_REP] = repeats,
};

static void hid_resolv_event(__u8 type, __u16 code, struct seq_file *f)
{
    seq_printf(f, "%s.%s", events[type] ? events[type] : "?",
        names[type] ? (names[type][code] ? names[type][code] : "?") : "?");
}

static void hid_dump_input_mapping(struct hid_device *hid, struct seq_file *f)
{
    int i, j, k;
    struct hid_report *report;
    struct hid_usage *usage;

    for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
        list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
            for (i = 0; i < report->maxfield; i++) {
                for ( j = 0; j < report->field[i]->maxusage; j++) {
                    usage = report->field[i]->usage + j;
                    hid_resolv_usage(usage->hid, f);
                    seq_printf(f, " ---> ");
                    hid_resolv_event(usage->type, usage->code, f);
                    seq_printf(f, "\n");
                }
            }
        }
    }

}

static int hid_debug_rdesc_show(struct seq_file *f, void *p)
{
    struct hid_device *hdev = f->private;
    const __u8 *rdesc = hdev->rdesc;
    unsigned rsize = hdev->rsize;
    int i;

    if (!rdesc) {
        rdesc = hdev->dev_rdesc;
        rsize = hdev->dev_rsize;
    }

    /* dump HID report descriptor */
    for (i = 0; i < rsize; i++)
        seq_printf(f, "%02x ", rdesc[i]);
    seq_printf(f, "\n\n");

    /* dump parsed data and input mappings */
    hid_dump_device(hdev, f);
    seq_printf(f, "\n");
    hid_dump_input_mapping(hdev, f);

    return 0;
}

static int hid_debug_rdesc_open(struct inode *inode, struct file *file)
{
    return single_open(file, hid_debug_rdesc_show, inode->i_private);
}

static int hid_debug_events_open(struct inode *inode, struct file *file)
{
    int err = 0;
    struct hid_debug_list *list;

    if (!(list = kzalloc(sizeof(struct hid_debug_list), GFP_KERNEL))) {
        err = -ENOMEM;
        goto out;
    }

    if (!(list->hid_debug_buf = kzalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_KERNEL))) {
        err = -ENOMEM;
        kfree(list);
        goto out;
    }
    list->hdev = (struct hid_device *) inode->i_private;
    file->private_data = list;
    mutex_init(&list->read_mutex);

    list_add_tail(&list->node, &list->hdev->debug_list);

out:
    return err;
}

static ssize_t hid_debug_events_read(struct file *file, char __user *buffer,
        size_t count, loff_t *ppos)
{
    struct hid_debug_list *list = file->private_data;
    int ret = 0, len;
    DECLARE_WAITQUEUE(wait, current);

    mutex_lock(&list->read_mutex);
    while (ret == 0) {
        if (list->head == list->tail) {
            add_wait_queue(&list->hdev->debug_wait, &wait);
            set_current_state(TASK_INTERRUPTIBLE);

            while (list->head == list->tail) {
                if (file->f_flags & O_NONBLOCK) {
                    ret = -EAGAIN;
                    break;
                }
                if (signal_pending(current)) {
                    ret = -ERESTARTSYS;
                    break;
                }

                if (!list->hdev || !list->hdev->debug) {
                    ret = -EIO;
                    break;
                }

                /* allow O_NONBLOCK from other threads */
                mutex_unlock(&list->read_mutex);
                schedule();
                mutex_lock(&list->read_mutex);
                set_current_state(TASK_INTERRUPTIBLE);
            }

            set_current_state(TASK_RUNNING);
            remove_wait_queue(&list->hdev->debug_wait, &wait);
        }

        if (ret)
            goto out;

        /* pass the ringbuffer contents to userspace */
copy_rest:
        if (list->tail == list->head)
            goto out;
        if (list->tail > list->head) {
            len = list->tail - list->head;

            if (copy_to_user(buffer + ret, &list->hid_debug_buf[list->head], len)) {
                ret = -EFAULT;
                goto out;
            }
            ret += len;
            list->head += len;
        } else {
            len = HID_DEBUG_BUFSIZE - list->head;

            if (copy_to_user(buffer, &list->hid_debug_buf[list->head], len)) {
                ret = -EFAULT;
                goto out;
            }
            list->head = 0;
            ret += len;
            goto copy_rest;
        }

    }
out:
    mutex_unlock(&list->read_mutex);
    return ret;
}

static unsigned int hid_debug_events_poll(struct file *file, poll_table *wait)
{
    struct hid_debug_list *list = file->private_data;

    poll_wait(file, &list->hdev->debug_wait, wait);
    if (list->head != list->tail)
        return POLLIN | POLLRDNORM;
    if (!list->hdev->debug)
        return POLLERR | POLLHUP;
    return 0;
}

static int hid_debug_events_release(struct inode *inode, struct file *file)
{
    struct hid_debug_list *list = file->private_data;

    list_del(&list->node);
    kfree(list->hid_debug_buf);
    kfree(list);

    return 0;
}

static const struct file_operations hid_debug_rdesc_fops = {
    .open           = hid_debug_rdesc_open,
    .read           = seq_read,
    .llseek         = seq_lseek,
    .release        = single_release,
};

static const struct file_operations hid_debug_events_fops = {
    .owner =        THIS_MODULE,
    .open           = hid_debug_events_open,
    .read           = hid_debug_events_read,
    .poll       = hid_debug_events_poll,
    .release        = hid_debug_events_release,
    .llseek     = noop_llseek,
};


void hid_debug_register(struct hid_device *hdev, const char *name)
{
    hdev->debug_dir = debugfs_create_dir(name, hid_debug_root);
    hdev->debug_rdesc = debugfs_create_file("rdesc", 0400,
            hdev->debug_dir, hdev, &hid_debug_rdesc_fops);
    hdev->debug_events = debugfs_create_file("events", 0400,
            hdev->debug_dir, hdev, &hid_debug_events_fops);
    hdev->debug = 1;
}

void hid_debug_unregister(struct hid_device *hdev)
{
    hdev->debug = 0;
    wake_up_interruptible(&hdev->debug_wait);
    debugfs_remove(hdev->debug_rdesc);
    debugfs_remove(hdev->debug_events);
    debugfs_remove(hdev->debug_dir);
}

void hid_debug_init(void)
{
    hid_debug_root = debugfs_create_dir("hid", NULL);
}

void hid_debug_exit(void)
{
    debugfs_remove_recursive(hid_debug_root);
}