drivers/hid/hid-debug.c

   1 /*
   2  *  (c) 1999 Andreas Gal                <gal@cs.uni-magdeburg.de>
   3  *  (c) 2000-2001 Vojtech Pavlik        <vojtech@ucw.cz>
   4  *  (c) 2007-2009 Jiri Kosina
   5  *
   6  *  HID debugging support
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  *
  24  * Should you need to contact me, the author, you can do so either by
  25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  27  */
  28
  29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/debugfs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/kfifo.h>
  34 #include <linux/sched/signal.h>
  35 #include <linux/export.h>
  36 #include <linux/slab.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/poll.h>
  39
  40 #include <linux/hid.h>
  41 #include <linux/hid-debug.h>
  42
  43 static struct dentry *hid_debug_root;
  44
  45 struct hid_usage_entry {
  46         unsigned  page;
  47         unsigned  usage;
  48         const char     *description;
  49 };
  50
  51 static const struct hid_usage_entry hid_usage_table[] = {
  52   {  0,      0, "Undefined" },
  53   {  1,      0, "GenericDesktop" },
  54     {0, 0x01, "Pointer"},
  55     {0, 0x02, "Mouse"},
  56     {0, 0x04, "Joystick"},
  57     {0, 0x05, "GamePad"},
  58     {0, 0x06, "Keyboard"},
  59     {0, 0x07, "Keypad"},
  60     {0, 0x08, "MultiAxis"},
  61       {0, 0x30, "X"},
  62       {0, 0x31, "Y"},
  63       {0, 0x32, "Z"},
  64       {0, 0x33, "Rx"},
  65       {0, 0x34, "Ry"},
  66       {0, 0x35, "Rz"},
  67       {0, 0x36, "Slider"},
  68       {0, 0x37, "Dial"},
  69       {0, 0x38, "Wheel"},
  70       {0, 0x39, "HatSwitch"},
  71     {0, 0x3a, "CountedBuffer"},
  72       {0, 0x3b, "ByteCount"},
  73       {0, 0x3c, "MotionWakeup"},
  74       {0, 0x3d, "Start"},
  75       {0, 0x3e, "Select"},
  76       {0, 0x40, "Vx"},
  77       {0, 0x41, "Vy"},
  78       {0, 0x42, "Vz"},
  79       {0, 0x43, "Vbrx"},
  80       {0, 0x44, "Vbry"},
  81       {0, 0x45, "Vbrz"},
  82       {0, 0x46, "Vno"},
  83     {0, 0x80, "SystemControl"},
  84       {0, 0x81, "SystemPowerDown"},
  85       {0, 0x82, "SystemSleep"},
  86       {0, 0x83, "SystemWakeUp"},
  87       {0, 0x84, "SystemContextMenu"},
  88       {0, 0x85, "SystemMainMenu"},
  89       {0, 0x86, "SystemAppMenu"},
  90       {0, 0x87, "SystemMenuHelp"},
  91       {0, 0x88, "SystemMenuExit"},
  92       {0, 0x89, "SystemMenuSelect"},
  93       {0, 0x8a, "SystemMenuRight"},
  94       {0, 0x8b, "SystemMenuLeft"},
  95       {0, 0x8c, "SystemMenuUp"},
  96       {0, 0x8d, "SystemMenuDown"},
  97       {0, 0x90, "D-PadUp"},
  98       {0, 0x91, "D-PadDown"},
  99       {0, 0x92, "D-PadRight"},
 100       {0, 0x93, "D-PadLeft"},
 101   {  2, 0, "Simulation" },
 102       {0, 0xb0, "Aileron"},
 103       {0, 0xb1, "AileronTrim"},
 104       {0, 0xb2, "Anti-Torque"},
 105       {0, 0xb3, "Autopilot"},
 106       {0, 0xb4, "Chaff"},
 107       {0, 0xb5, "Collective"},
 108       {0, 0xb6, "DiveBrake"},
 109       {0, 0xb7, "ElectronicCountermeasures"},
 110       {0, 0xb8, "Elevator"},
 111       {0, 0xb9, "ElevatorTrim"},
 112       {0, 0xba, "Rudder"},
 113       {0, 0xbb, "Throttle"},
 114       {0, 0xbc, "FlightCommunications"},
 115       {0, 0xbd, "FlareRelease"},
 116       {0, 0xbe, "LandingGear"},
 117       {0, 0xbf, "ToeBrake"},
 118   {  6, 0, "GenericDeviceControls" },
 119       {0, 0x20, "BatteryStrength" },
 120       {0, 0x21, "WirelessChannel" },
 121       {0, 0x22, "WirelessID" },
 122       {0, 0x23, "DiscoverWirelessControl" },
 123       {0, 0x24, "SecurityCodeCharacterEntered" },
 124       {0, 0x25, "SecurityCodeCharactedErased" },
 125       {0, 0x26, "SecurityCodeCleared" },
 126   {  7, 0, "Keyboard" },
 127   {  8, 0, "LED" },
 128       {0, 0x01, "NumLock"},
 129       {0, 0x02, "CapsLock"},
 130       {0, 0x03, "ScrollLock"},
 131       {0, 0x04, "Compose"},
 132       {0, 0x05, "Kana"},
 133       {0, 0x4b, "GenericIndicator"},
 134   {  9, 0, "Button" },
 135   { 10, 0, "Ordinal" },
 136   { 12, 0, "Consumer" },
 137       {0, 0x238, "HorizontalWheel"},
 138   { 13, 0, "Digitizers" },
 139     {0, 0x01, "Digitizer"},
 140     {0, 0x02, "Pen"},
 141     {0, 0x03, "LightPen"},
 142     {0, 0x04, "TouchScreen"},
 143     {0, 0x05, "TouchPad"},
 144     {0, 0x0e, "DeviceConfiguration"},
 145     {0, 0x20, "Stylus"},
 146     {0, 0x21, "Puck"},
 147     {0, 0x22, "Finger"},
 148     {0, 0x23, "DeviceSettings"},
 149     {0, 0x30, "TipPressure"},
 150     {0, 0x31, "BarrelPressure"},
 151     {0, 0x32, "InRange"},
 152     {0, 0x33, "Touch"},
 153     {0, 0x34, "UnTouch"},
 154     {0, 0x35, "Tap"},
 155     {0, 0x39, "TabletFunctionKey"},
 156     {0, 0x3a, "ProgramChangeKey"},
 157     {0, 0x3c, "Invert"},
 158     {0, 0x42, "TipSwitch"},
 159     {0, 0x43, "SecondaryTipSwitch"},
 160     {0, 0x44, "BarrelSwitch"},
 161     {0, 0x45, "Eraser"},
 162     {0, 0x46, "TabletPick"},
 163     {0, 0x47, "Confidence"},
 164     {0, 0x48, "Width"},
 165     {0, 0x49, "Height"},
 166     {0, 0x51, "ContactID"},
 167     {0, 0x52, "InputMode"},
 168     {0, 0x53, "DeviceIndex"},
 169     {0, 0x54, "ContactCount"},
 170     {0, 0x55, "ContactMaximumNumber"},
 171     {0, 0x59, "ButtonType"},
 172     {0, 0x5A, "SecondaryBarrelSwitch"},
 173     {0, 0x5B, "TransducerSerialNumber"},
 174   { 15, 0, "PhysicalInterfaceDevice" },
 175     {0, 0x00, "Undefined"},
 176     {0, 0x01, "Physical_Interface_Device"},
 177       {0, 0x20, "Normal"},
 178     {0, 0x21, "Set_Effect_Report"},
 179       {0, 0x22, "Effect_Block_Index"},
 180       {0, 0x23, "Parameter_Block_Offset"},
 181       {0, 0x24, "ROM_Flag"},
 182       {0, 0x25, "Effect_Type"},
 183         {0, 0x26, "ET_Constant_Force"},
 184         {0, 0x27, "ET_Ramp"},
 185         {0, 0x28, "ET_Custom_Force_Data"},
 186         {0, 0x30, "ET_Square"},
 187         {0, 0x31, "ET_Sine"},
 188         {0, 0x32, "ET_Triangle"},
 189         {0, 0x33, "ET_Sawtooth_Up"},
 190         {0, 0x34, "ET_Sawtooth_Down"},
 191         {0, 0x40, "ET_Spring"},
 192         {0, 0x41, "ET_Damper"},
 193         {0, 0x42, "ET_Inertia"},
 194         {0, 0x43, "ET_Friction"},
 195       {0, 0x50, "Duration"},
 196       {0, 0x51, "Sample_Period"},
 197       {0, 0x52, "Gain"},
 198       {0, 0x53, "Trigger_Button"},
 199       {0, 0x54, "Trigger_Repeat_Interval"},
 200       {0, 0x55, "Axes_Enable"},
 201         {0, 0x56, "Direction_Enable"},
 202       {0, 0x57, "Direction"},
 203       {0, 0x58, "Type_Specific_Block_Offset"},
 204         {0, 0x59, "Block_Type"},
 205         {0, 0x5A, "Set_Envelope_Report"},
 206           {0, 0x5B, "Attack_Level"},
 207           {0, 0x5C, "Attack_Time"},
 208           {0, 0x5D, "Fade_Level"},
 209           {0, 0x5E, "Fade_Time"},
 210         {0, 0x5F, "Set_Condition_Report"},
 211         {0, 0x60, "CP_Offset"},
 212         {0, 0x61, "Positive_Coefficient"},
 213         {0, 0x62, "Negative_Coefficient"},
 214         {0, 0x63, "Positive_Saturation"},
 215         {0, 0x64, "Negative_Saturation"},
 216         {0, 0x65, "Dead_Band"},
 217       {0, 0x66, "Download_Force_Sample"},
 218       {0, 0x67, "Isoch_Custom_Force_Enable"},
 219       {0, 0x68, "Custom_Force_Data_Report"},
 220         {0, 0x69, "Custom_Force_Data"},
 221         {0, 0x6A, "Custom_Force_Vendor_Defined_Data"},
 222       {0, 0x6B, "Set_Custom_Force_Report"},
 223         {0, 0x6C, "Custom_Force_Data_Offset"},
 224         {0, 0x6D, "Sample_Count"},
 225       {0, 0x6E, "Set_Periodic_Report"},
 226         {0, 0x6F, "Offset"},
 227         {0, 0x70, "Magnitude"},
 228         {0, 0x71, "Phase"},
 229         {0, 0x72, "Period"},
 230       {0, 0x73, "Set_Constant_Force_Report"},
 231         {0, 0x74, "Set_Ramp_Force_Report"},
 232         {0, 0x75, "Ramp_Start"},
 233         {0, 0x76, "Ramp_End"},
 234       {0, 0x77, "Effect_Operation_Report"},
 235         {0, 0x78, "Effect_Operation"},
 236           {0, 0x79, "Op_Effect_Start"},
 237           {0, 0x7A, "Op_Effect_Start_Solo"},
 238           {0, 0x7B, "Op_Effect_Stop"},
 239           {0, 0x7C, "Loop_Count"},
 240       {0, 0x7D, "Device_Gain_Report"},
 241         {0, 0x7E, "Device_Gain"},
 242     {0, 0x7F, "PID_Pool_Report"},
 243       {0, 0x80, "RAM_Pool_Size"},
 244       {0, 0x81, "ROM_Pool_Size"},
 245       {0, 0x82, "ROM_Effect_Block_Count"},
 246       {0, 0x83, "Simultaneous_Effects_Max"},
 247       {0, 0x84, "Pool_Alignment"},
 248     {0, 0x85, "PID_Pool_Move_Report"},
 249       {0, 0x86, "Move_Source"},
 250       {0, 0x87, "Move_Destination"},
 251       {0, 0x88, "Move_Length"},
 252     {0, 0x89, "PID_Block_Load_Report"},
 253       {0, 0x8B, "Block_Load_Status"},
 254       {0, 0x8C, "Block_Load_Success"},
 255       {0, 0x8D, "Block_Load_Full"},
 256       {0, 0x8E, "Block_Load_Error"},
 257       {0, 0x8F, "Block_Handle"},
 258       {0, 0x90, "PID_Block_Free_Report"},
 259       {0, 0x91, "Type_Specific_Block_Handle"},
 260     {0, 0x92, "PID_State_Report"},
 261       {0, 0x94, "Effect_Playing"},
 262       {0, 0x95, "PID_Device_Control_Report"},
 263         {0, 0x96, "PID_Device_Control"},
 264         {0, 0x97, "DC_Enable_Actuators"},
 265         {0, 0x98, "DC_Disable_Actuators"},
 266         {0, 0x99, "DC_Stop_All_Effects"},
 267         {0, 0x9A, "DC_Device_Reset"},
 268         {0, 0x9B, "DC_Device_Pause"},
 269         {0, 0x9C, "DC_Device_Continue"},
 270       {0, 0x9F, "Device_Paused"},
 271       {0, 0xA0, "Actuators_Enabled"},
 272       {0, 0xA4, "Safety_Switch"},
 273       {0, 0xA5, "Actuator_Override_Switch"},
 274       {0, 0xA6, "Actuator_Power"},
 275     {0, 0xA7, "Start_Delay"},
 276     {0, 0xA8, "Parameter_Block_Size"},
 277     {0, 0xA9, "Device_Managed_Pool"},
 278     {0, 0xAA, "Shared_Parameter_Blocks"},
 279     {0, 0xAB, "Create_New_Effect_Report"},
 280     {0, 0xAC, "RAM_Pool_Available"},
 281   {  0x20, 0, "Sensor" },
 282     { 0x20, 0x01, "Sensor" },
 283     { 0x20, 0x10, "Biometric" },
 284       { 0x20, 0x11, "BiometricHumanPresence" },
 285       { 0x20, 0x12, "BiometricHumanProximity" },
 286       { 0x20, 0x13, "BiometricHumanTouch" },
 287     { 0x20, 0x20, "Electrical" },
 288       { 0x20, 0x21, "ElectricalCapacitance" },
 289       { 0x20, 0x22, "ElectricalCurrent" },
 290       { 0x20, 0x23, "ElectricalPower" },
 291       { 0x20, 0x24, "ElectricalInductance" },
 292       { 0x20, 0x25, "ElectricalResistance" },
 293       { 0x20, 0x26, "ElectricalVoltage" },
 294       { 0x20, 0x27, "ElectricalPoteniometer" },
 295       { 0x20, 0x28, "ElectricalFrequency" },
 296       { 0x20, 0x29, "ElectricalPeriod" },
 297     { 0x20, 0x30, "Environmental" },
 298       { 0x20, 0x31, "EnvironmentalAtmosphericPressure" },
 299       { 0x20, 0x32, "EnvironmentalHumidity" },
 300       { 0x20, 0x33, "EnvironmentalTemperature" },
 301       { 0x20, 0x34, "EnvironmentalWindDirection" },
 302       { 0x20, 0x35, "EnvironmentalWindSpeed" },
 303     { 0x20, 0x40, "Light" },
 304       { 0x20, 0x41, "LightAmbientLight" },
 305       { 0x20, 0x42, "LightConsumerInfrared" },
 306     { 0x20, 0x50, "Location" },
 307       { 0x20, 0x51, "LocationBroadcast" },
 308       { 0x20, 0x52, "LocationDeadReckoning" },
 309       { 0x20, 0x53, "LocationGPS" },
 310       { 0x20, 0x54, "LocationLookup" },
 311       { 0x20, 0x55, "LocationOther" },
 312       { 0x20, 0x56, "LocationStatic" },
 313       { 0x20, 0x57, "LocationTriangulation" },
 314     { 0x20, 0x60, "Mechanical" },
 315       { 0x20, 0x61, "MechanicalBooleanSwitch" },
 316       { 0x20, 0x62, "MechanicalBooleanSwitchArray" },
 317       { 0x20, 0x63, "MechanicalMultivalueSwitch" },
 318       { 0x20, 0x64, "MechanicalForce" },
 319       { 0x20, 0x65, "MechanicalPressure" },
 320       { 0x20, 0x66, "MechanicalStrain" },
 321       { 0x20, 0x67, "MechanicalWeight" },
 322       { 0x20, 0x68, "MechanicalHapticVibrator" },
 323       { 0x20, 0x69, "MechanicalHallEffectSwitch" },
 324     { 0x20, 0x70, "Motion" },
 325       { 0x20, 0x71, "MotionAccelerometer1D" },
 326       { 0x20, 0x72, "MotionAccelerometer2D" },
 327       { 0x20, 0x73, "MotionAccelerometer3D" },
 328       { 0x20, 0x74, "MotionGyrometer1D" },
 329       { 0x20, 0x75, "MotionGyrometer2D" },
 330       { 0x20, 0x76, "MotionGyrometer3D" },
 331       { 0x20, 0x77, "MotionMotionDetector" },
 332       { 0x20, 0x78, "MotionSpeedometer" },
 333       { 0x20, 0x79, "MotionAccelerometer" },
 334       { 0x20, 0x7A, "MotionGyrometer" },
 335     { 0x20, 0x80, "Orientation" },
 336       { 0x20, 0x81, "OrientationCompass1D" },
 337       { 0x20, 0x82, "OrientationCompass2D" },
 338       { 0x20, 0x83, "OrientationCompass3D" },
 339       { 0x20, 0x84, "OrientationInclinometer1D" },
 340       { 0x20, 0x85, "OrientationInclinometer2D" },
 341       { 0x20, 0x86, "OrientationInclinometer3D" },
 342       { 0x20, 0x87, "OrientationDistance1D" },
 343       { 0x20, 0x88, "OrientationDistance2D" },
 344       { 0x20, 0x89, "OrientationDistance3D" },
 345       { 0x20, 0x8A, "OrientationDeviceOrientation" },
 346       { 0x20, 0x8B, "OrientationCompass" },
 347       { 0x20, 0x8C, "OrientationInclinometer" },
 348       { 0x20, 0x8D, "OrientationDistance" },
 349     { 0x20, 0x90, "Scanner" },
 350       { 0x20, 0x91, "ScannerBarcode" },
 351       { 0x20, 0x91, "ScannerRFID" },
 352       { 0x20, 0x91, "ScannerNFC" },
 353     { 0x20, 0xA0, "Time" },
 354       { 0x20, 0xA1, "TimeAlarmTimer" },
 355       { 0x20, 0xA2, "TimeRealTimeClock" },
 356     { 0x20, 0xE0, "Other" },
 357       { 0x20, 0xE1, "OtherCustom" },
 358       { 0x20, 0xE2, "OtherGeneric" },
 359       { 0x20, 0xE3, "OtherGenericEnumerator" },
 360   { 0x84, 0, "Power Device" },
 361     { 0x84, 0x02, "PresentStatus" },
 362     { 0x84, 0x03, "ChangeStatus" },
 363     { 0x84, 0x04, "UPS" },
 364     { 0x84, 0x05, "PowerSupply" },
 365     { 0x84, 0x10, "BatterySystem" },
 366     { 0x84, 0x11, "BatterySystemID" },
 367     { 0x84, 0x12, "Battery" },
 368     { 0x84, 0x13, "BatteryID" },
 369     { 0x84, 0x14, "Charger" },
 370     { 0x84, 0x15, "ChargerID" },
 371     { 0x84, 0x16, "PowerConverter" },
 372     { 0x84, 0x17, "PowerConverterID" },
 373     { 0x84, 0x18, "OutletSystem" },
 374     { 0x84, 0x19, "OutletSystemID" },
 375     { 0x84, 0x1a, "Input" },
 376     { 0x84, 0x1b, "InputID" },
 377     { 0x84, 0x1c, "Output" },
 378     { 0x84, 0x1d, "OutputID" },
 379     { 0x84, 0x1e, "Flow" },
 380     { 0x84, 0x1f, "FlowID" },
 381     { 0x84, 0x20, "Outlet" },
 382     { 0x84, 0x21, "OutletID" },
 383     { 0x84, 0x22, "Gang" },
 384     { 0x84, 0x24, "PowerSummary" },
 385     { 0x84, 0x25, "PowerSummaryID" },
 386     { 0x84, 0x30, "Voltage" },
 387     { 0x84, 0x31, "Current" },
 388     { 0x84, 0x32, "Frequency" },
 389     { 0x84, 0x33, "ApparentPower" },
 390     { 0x84, 0x35, "PercentLoad" },
 391     { 0x84, 0x40, "ConfigVoltage" },
 392     { 0x84, 0x41, "ConfigCurrent" },
 393     { 0x84, 0x43, "ConfigApparentPower" },
 394     { 0x84, 0x53, "LowVoltageTransfer" },
 395     { 0x84, 0x54, "HighVoltageTransfer" },
 396     { 0x84, 0x56, "DelayBeforeStartup" },
 397     { 0x84, 0x57, "DelayBeforeShutdown" },
 398     { 0x84, 0x58, "Test" },
 399     { 0x84, 0x5a, "AudibleAlarmControl" },
 400     { 0x84, 0x60, "Present" },
 401     { 0x84, 0x61, "Good" },
 402     { 0x84, 0x62, "InternalFailure" },
 403     { 0x84, 0x65, "Overload" },
 404     { 0x84, 0x66, "OverCharged" },
 405     { 0x84, 0x67, "OverTemperature" },
 406     { 0x84, 0x68, "ShutdownRequested" },
 407     { 0x84, 0x69, "ShutdownImminent" },
 408     { 0x84, 0x6b, "SwitchOn/Off" },
 409     { 0x84, 0x6c, "Switchable" },
 410     { 0x84, 0x6d, "Used" },
 411     { 0x84, 0x6e, "Boost" },
 412     { 0x84, 0x73, "CommunicationLost" },
 413     { 0x84, 0xfd, "iManufacturer" },
 414     { 0x84, 0xfe, "iProduct" },
 415     { 0x84, 0xff, "iSerialNumber" },
 416   { 0x85, 0, "Battery System" },
 417     { 0x85, 0x01, "SMBBatteryMode" },
 418     { 0x85, 0x02, "SMBBatteryStatus" },
 419     { 0x85, 0x03, "SMBAlarmWarning" },
 420     { 0x85, 0x04, "SMBChargerMode" },
 421     { 0x85, 0x05, "SMBChargerStatus" },
 422     { 0x85, 0x06, "SMBChargerSpecInfo" },
 423     { 0x85, 0x07, "SMBSelectorState" },
 424     { 0x85, 0x08, "SMBSelectorPresets" },
 425     { 0x85, 0x09, "SMBSelectorInfo" },
 426     { 0x85, 0x29, "RemainingCapacityLimit" },
 427     { 0x85, 0x2c, "CapacityMode" },
 428     { 0x85, 0x42, "BelowRemainingCapacityLimit" },
 429     { 0x85, 0x44, "Charging" },
 430     { 0x85, 0x45, "Discharging" },
 431     { 0x85, 0x4b, "NeedReplacement" },
 432     { 0x85, 0x66, "RemainingCapacity" },
 433     { 0x85, 0x68, "RunTimeToEmpty" },
 434     { 0x85, 0x6a, "AverageTimeToFull" },
 435     { 0x85, 0x83, "DesignCapacity" },
 436     { 0x85, 0x85, "ManufacturerDate" },
 437     { 0x85, 0x89, "iDeviceChemistry" },
 438     { 0x85, 0x8b, "Rechargeable" },
 439     { 0x85, 0x8f, "iOEMInformation" },
 440     { 0x85, 0x8d, "CapacityGranularity1" },
 441     { 0x85, 0xd0, "ACPresent" },
 442   /* pages 0xff00 to 0xffff are vendor-specific */
 443   { 0xffff, 0, "Vendor-specific-FF" },
 444   { 0, 0, NULL }
 445 };
 446
 447 /* Either output directly into simple seq_file, or (if f == NULL)
 448  * allocate a separate buffer that will then be passed to the 'events'
 449  * ringbuffer.
 450  *
 451  * This is because these functions can be called both for "one-shot"
 452  * "rdesc" while resolving, or for blocking "events".
 453  *
 454  * This holds both for resolv_usage_page() and hid_resolv_usage().
 455  */
 456 static char *resolv_usage_page(unsigned page, struct seq_file *f) {
 457         const struct hid_usage_entry *p;
 458         char *buf = NULL;
 459
 460         if (!f) {
 461                 buf = kzalloc(HID_DEBUG_BUFSIZE, GFP_ATOMIC);
 462                 if (!buf)
 463                         return ERR_PTR(-ENOMEM);
 464         }
 465
 466         for (p = hid_usage_table; p->description; p++)
 467                 if (p->page == page) {
 468                         if (!f) {
 469                                 snprintf(buf, HID_DEBUG_BUFSIZE, "%s",
 470                                                 p->description);
 471                                 return buf;
 472                         }
 473                         else {
 474                                 seq_printf(f, "%s", p->description);
 475                                 return NULL;
 476                         }
 477                 }
 478         if (!f)
 479                 snprintf(buf, HID_DEBUG_BUFSIZE, "%04x", page);
 480         else
 481                 seq_printf(f, "%04x", page);
 482         return buf;
 483 }
 484
 485 char *hid_resolv_usage(unsigned usage, struct seq_file *f) {
 486         const struct hid_usage_entry *p;
 487         char *buf = NULL;
 488         int len = 0;
 489
 490         buf = resolv_usage_page(usage >> 16, f);
 491         if (IS_ERR(buf)) {
 492                 pr_err("error allocating HID debug buffer\n");
 493                 return NULL;
 494         }
 495
 496
 497         if (!f) {
 498                 len = strlen(buf);
 499                 snprintf(buf+len, max(0, HID_DEBUG_BUFSIZE - len), ".");
 500                 len++;
 501         }
 502         else {
 503                 seq_printf(f, ".");
 504         }
 505         for (p = hid_usage_table; p->description; p++)
 506                 if (p->page == (usage >> 16)) {
 507                         for(++p; p->description && p->usage != 0; p++)
 508                                 if (p->usage == (usage & 0xffff)) {
 509                                         if (!f)
 510                                                 snprintf(buf + len,
 511                                                         max(0,HID_DEBUG_BUFSIZE - len - 1),
 512                                                         "%s", p->description);
 513                                         else
 514                                                 seq_printf(f,
 515                                                         "%s",
 516                                                         p->description);
 517                                         return buf;
 518                                 }
 519                         break;
 520                 }
 521         if (!f)
 522                 snprintf(buf + len, max(0, HID_DEBUG_BUFSIZE - len - 1),
 523                                 "%04x", usage & 0xffff);
 524         else
 525                 seq_printf(f, "%04x", usage & 0xffff);
 526         return buf;
 527 }
 528 EXPORT_SYMBOL_GPL(hid_resolv_usage);
 529
 530 static void tab(int n, struct seq_file *f) {
 531         seq_printf(f, "%*s", n, "");
 532 }
 533
 534 void hid_dump_field(struct hid_field *field, int n, struct seq_file *f) {
 535         int j;
 536
 537         if (field->physical) {
 538                 tab(n, f);
 539                 seq_printf(f, "Physical(");
 540                 hid_resolv_usage(field->physical, f); seq_printf(f, ")\n");
 541         }
 542         if (field->logical) {
 543                 tab(n, f);
 544                 seq_printf(f, "Logical(");
 545                 hid_resolv_usage(field->logical, f); seq_printf(f, ")\n");
 546         }
 547         if (field->application) {
 548                 tab(n, f);
 549                 seq_printf(f, "Application(");
 550                 hid_resolv_usage(field->application, f); seq_printf(f, ")\n");
 551         }
 552         tab(n, f); seq_printf(f, "Usage(%d)\n", field->maxusage);
 553         for (j = 0; j < field->maxusage; j++) {
 554                 tab(n+2, f); hid_resolv_usage(field->usage[j].hid, f); seq_printf(f, "\n");
 555         }
 556         if (field->logical_minimum != field->logical_maximum) {
 557                 tab(n, f); seq_printf(f, "Logical Minimum(%d)\n", field->logical_minimum);
 558                 tab(n, f); seq_printf(f, "Logical Maximum(%d)\n", field->logical_maximum);
 559         }
 560         if (field->physical_minimum != field->physical_maximum) {
 561                 tab(n, f); seq_printf(f, "Physical Minimum(%d)\n", field->physical_minimum);
 562                 tab(n, f); seq_printf(f, "Physical Maximum(%d)\n", field->physical_maximum);
 563         }
 564         if (field->unit_exponent) {
 565                 tab(n, f); seq_printf(f, "Unit Exponent(%d)\n", field->unit_exponent);
 566         }
 567         if (field->unit) {
 568                 static const char *systems[5] = { "None", "SI Linear", "SI Rotation", "English Linear", "English Rotation" };
 569                 static const char *units[5][8] = {
 570                         { "None", "None", "None", "None", "None", "None", "None", "None" },
 571                         { "None", "Centimeter", "Gram", "Seconds", "Kelvin",     "Ampere", "Candela", "None" },
 572                         { "None", "Radians",    "Gram", "Seconds", "Kelvin",     "Ampere", "Candela", "None" },
 573                         { "None", "Inch",       "Slug", "Seconds", "Fahrenheit", "Ampere", "Candela", "None" },
 574                         { "None", "Degrees",    "Slug", "Seconds", "Fahrenheit", "Ampere", "Candela", "None" }
 575                 };
 576
 577                 int i;
 578                 int sys;
 579                 __u32 data = field->unit;
 580
 581                 /* First nibble tells us which system we're in. */
 582                 sys = data & 0xf;
 583                 data >>= 4;
 584
 585                 if(sys > 4) {
 586                         tab(n, f); seq_printf(f, "Unit(Invalid)\n");
 587                 }
 588                 else {
 589                         int earlier_unit = 0;
 590
 591                         tab(n, f); seq_printf(f, "Unit(%s : ", systems[sys]);
 592
 593                         for (i=1 ; i<sizeof(__u32)*2 ; i++) {
 594                                 char nibble = data & 0xf;
 595                                 data >>= 4;
 596                                 if (nibble != 0) {
 597                                         if(earlier_unit++ > 0)
 598                                                 seq_printf(f, "*");
 599                                         seq_printf(f, "%s", units[sys][i]);
 600                                         if(nibble != 1) {
 601                                                 /* This is a _signed_ nibble(!) */
 602
 603                                                 int val = nibble & 0x7;
 604                                                 if(nibble & 0x08)
 605                                                         val = -((0x7 & ~val) +1);
 606                                                 seq_printf(f, "^%d", val);
 607                                         }
 608                                 }
 609                         }
 610                         seq_printf(f, ")\n");
 611                 }
 612         }
 613         tab(n, f); seq_printf(f, "Report Size(%u)\n", field->report_size);
 614         tab(n, f); seq_printf(f, "Report Count(%u)\n", field->report_count);
 615         tab(n, f); seq_printf(f, "Report Offset(%u)\n", field->report_offset);
 616
 617         tab(n, f); seq_printf(f, "Flags( ");
 618         j = field->flags;
 619         seq_printf(f, "%s", HID_MAIN_ITEM_CONSTANT & j ? "Constant " : "");
 620         seq_printf(f, "%s", HID_MAIN_ITEM_VARIABLE & j ? "Variable " : "Array ");
 621         seq_printf(f, "%s", HID_MAIN_ITEM_RELATIVE & j ? "Relative " : "Absolute ");
 622         seq_printf(f, "%s", HID_MAIN_ITEM_WRAP & j ? "Wrap " : "");
 623         seq_printf(f, "%s", HID_MAIN_ITEM_NONLINEAR & j ? "NonLinear " : "");
 624         seq_printf(f, "%s", HID_MAIN_ITEM_NO_PREFERRED & j ? "NoPreferredState " : "");
 625         seq_printf(f, "%s", HID_MAIN_ITEM_NULL_STATE & j ? "NullState " : "");
 626         seq_printf(f, "%s", HID_MAIN_ITEM_VOLATILE & j ? "Volatile " : "");
 627         seq_printf(f, "%s", HID_MAIN_ITEM_BUFFERED_BYTE & j ? "BufferedByte " : "");
 628         seq_printf(f, ")\n");
 629 }
 630 EXPORT_SYMBOL_GPL(hid_dump_field);
 631
 632 void hid_dump_device(struct hid_device *device, struct seq_file *f)
 633 {
 634         struct hid_report_enum *report_enum;
 635         struct hid_report *report;
 636         struct list_head *list;
 637         unsigned i,k;
 638         static const char *table[] = {"INPUT", "OUTPUT", "FEATURE"};
 639
 640         for (i = 0; i < HID_REPORT_TYPES; i++) {
 641                 report_enum = device->report_enum + i;
 642                 list = report_enum->report_list.next;
 643                 while (list != &report_enum->report_list) {
 644                         report = (struct hid_report *) list;
 645                         tab(2, f);
 646                         seq_printf(f, "%s", table[i]);
 647                         if (report->id)
 648                                 seq_printf(f, "(%d)", report->id);
 649                         seq_printf(f, "[%s]", table[report->type]);
 650                         seq_printf(f, "\n");
 651                         for (k = 0; k < report->maxfield; k++) {
 652                                 tab(4, f);
 653                                 seq_printf(f, "Field(%d)\n", k);
 654                                 hid_dump_field(report->field[k], 6, f);
 655                         }
 656                         list = list->next;
 657                 }
 658         }
 659 }
 660 EXPORT_SYMBOL_GPL(hid_dump_device);
 661
 662 /* enqueue string to 'events' ring buffer */
 663 void hid_debug_event(struct hid_device *hdev, char *buf)
 664 {
 665         struct hid_debug_list *list;
 666         unsigned long flags;
 667
 668         spin_lock_irqsave(&hdev->debug_list_lock, flags);
 669         list_for_each_entry(list, &hdev->debug_list, node)
 670                 kfifo_in(&list->hid_debug_fifo, buf, strlen(buf));
 671         spin_unlock_irqrestore(&hdev->debug_list_lock, flags);
 672
 673         wake_up_interruptible(&hdev->debug_wait);
 674 }
 675 EXPORT_SYMBOL_GPL(hid_debug_event);
 676
 677 void hid_dump_report(struct hid_device *hid, int type, u8 *data,
 678                 int size)
 679 {
 680         struct hid_report_enum *report_enum;
 681         char *buf;
 682         unsigned int i;
 683
 684         buf = kmalloc(HID_DEBUG_BUFSIZE, GFP_ATOMIC);
 685
 686         if (!buf)
 687                 return;
 688
 689         report_enum = hid->report_enum + type;
 690
 691         /* dump the report */
 692         snprintf(buf, HID_DEBUG_BUFSIZE - 1,
 693                         "\nreport (size %u) (%snumbered) = ", size,
 694                         report_enum->numbered ? "" : "un");
 695         hid_debug_event(hid, buf);
 696
 697         for (i = 0; i < size; i++) {
 698                 snprintf(buf, HID_DEBUG_BUFSIZE - 1,
 699                                 " %02x", data[i]);
 700                 hid_debug_event(hid, buf);
 701         }
 702         hid_debug_event(hid, "\n");
 703         kfree(buf);
 704 }
 705 EXPORT_SYMBOL_GPL(hid_dump_report);
 706
 707 void hid_dump_input(struct hid_device *hdev, struct hid_usage *usage, __s32 value)
 708 {
 709         char *buf;
 710         int len;
 711
 712         buf = hid_resolv_usage(usage->hid, NULL);
 713         if (!buf)
 714                 return;
 715         len = strlen(buf);
 716         snprintf(buf + len, HID_DEBUG_BUFSIZE - len - 1, " = %d\n", value);
 717
 718         hid_debug_event(hdev, buf);
 719
 720         kfree(buf);
 721         wake_up_interruptible(&hdev->debug_wait);
 722 }
 723 EXPORT_SYMBOL_GPL(hid_dump_input);
 724
 725 static const char *events[EV_MAX + 1] = {
 726         [EV_SYN] = "Sync",                      [EV_KEY] = "Key",
 727         [EV_REL] = "Relative",                  [EV_ABS] = "Absolute",
 728         [EV_MSC] = "Misc",                      [EV_LED] = "LED",
 729         [EV_SND] = "Sound",                     [EV_REP] = "Repeat",
 730         [EV_FF] = "ForceFeedback",              [EV_PWR] = "Power",
 731         [EV_FF_STATUS] = "ForceFeedbackStatus",
 732 };
 733
 734 static const char *syncs[3] = {
 735         [SYN_REPORT] = "Report",                [SYN_CONFIG] = "Config",
 736         [SYN_MT_REPORT] = "MT Report",
 737 };
 738
 739 static const char *keys[KEY_MAX + 1] = {
 740         [KEY_RESERVED] = "Reserved",            [KEY_ESC] = "Esc",
 741         [KEY_1] = "1",                          [KEY_2] = "2",
 742         [KEY_3] = "3",                          [KEY_4] = "4",
 743         [KEY_5] = "5",                          [KEY_6] = "6",
 744         [KEY_7] = "7",                          [KEY_8] = "8",
 745         [KEY_9] = "9",                          [KEY_0] = "0",
 746         [KEY_MINUS] = "Minus",                  [KEY_EQUAL] = "Equal",
 747         [KEY_BACKSPACE] = "Backspace",          [KEY_TAB] = "Tab",
 748         [KEY_Q] = "Q",                          [KEY_W] = "W",
 749         [KEY_E] = "E",                          [KEY_R] = "R",
 750         [KEY_T] = "T",                          [KEY_Y] = "Y",
 751         [KEY_U] = "U",                          [KEY_I] = "I",
 752         [KEY_O] = "O",                          [KEY_P] = "P",
 753         [KEY_LEFTBRACE] = "LeftBrace",          [KEY_RIGHTBRACE] = "RightBrace",
 754         [KEY_ENTER] = "Enter",                  [KEY_LEFTCTRL] = "LeftControl",
 755         [KEY_A] = "A",                          [KEY_S] = "S",
 756         [KEY_D] = "D",                          [KEY_F] = "F",
 757         [KEY_G] = "G",                          [KEY_H] = "H",
 758         [KEY_J] = "J",                          [KEY_K] = "K",
 759         [KEY_L] = "L",                          [KEY_SEMICOLON] = "Semicolon",
 760         [KEY_APOSTROPHE] = "Apostrophe",        [KEY_GRAVE] = "Grave",
 761         [KEY_LEFTSHIFT] = "LeftShift",          [KEY_BACKSLASH] = "BackSlash",
 762         [KEY_Z] = "Z",                          [KEY_X] = "X",
 763         [KEY_C] = "C",                          [KEY_V] = "V",
 764         [KEY_B] = "B",                          [KEY_N] = "N",
 765         [KEY_M] = "M",                          [KEY_COMMA] = "Comma",
 766         [KEY_DOT] = "Dot",                      [KEY_SLASH] = "Slash",
 767         [KEY_RIGHTSHIFT] = "RightShift",        [KEY_KPASTERISK] = "KPAsterisk",
 768         [KEY_LEFTALT] = "LeftAlt",              [KEY_SPACE] = "Space",
 769         [KEY_CAPSLOCK] = "CapsLock",            [KEY_F1] = "F1",
 770         [KEY_F2] = "F2",                        [KEY_F3] = "F3",
 771         [KEY_F4] = "F4",                        [KEY_F5] = "F5",
 772         [KEY_F6] = "F6",                        [KEY_F7] = "F7",
 773         [KEY_F8] = "F8",                        [KEY_F9] = "F9",
 774         [KEY_F10] = "F10",                      [KEY_NUMLOCK] = "NumLock",
 775         [KEY_SCROLLLOCK] = "ScrollLock",        [KEY_KP7] = "KP7",
 776         [KEY_KP8] = "KP8",                      [KEY_KP9] = "KP9",
 777         [KEY_KPMINUS] = "KPMinus",              [KEY_KP4] = "KP4",
 778         [KEY_KP5] = "KP5",                      [KEY_KP6] = "KP6",
 779         [KEY_KPPLUS] = "KPPlus",                [KEY_KP1] = "KP1",
 780         [KEY_KP2] = "KP2",                      [KEY_KP3] = "KP3",
 781         [KEY_KP0] = "KP0",                      [KEY_KPDOT] = "KPDot",
 782         [KEY_ZENKAKUHANKAKU] = "Zenkaku/Hankaku", [KEY_102ND] = "102nd",
 783         [KEY_F11] = "F11",                      [KEY_F12] = "F12",
 784         [KEY_RO] = "RO",                        [KEY_KATAKANA] = "Katakana",
 785         [KEY_HIRAGANA] = "HIRAGANA",            [KEY_HENKAN] = "Henkan",
 786         [KEY_KATAKANAHIRAGANA] = "Katakana/Hiragana", [KEY_MUHENKAN] = "Muhenkan",
 787         [KEY_KPJPCOMMA] = "KPJpComma",          [KEY_KPENTER] = "KPEnter",
 788         [KEY_RIGHTCTRL] = "RightCtrl",          [KEY_KPSLASH] = "KPSlash",
 789         [KEY_SYSRQ] = "SysRq",                  [KEY_RIGHTALT] = "RightAlt",
 790         [KEY_LINEFEED] = "LineFeed",            [KEY_HOME] = "Home",
 791         [KEY_UP] = "Up",                        [KEY_PAGEUP] = "PageUp",
 792         [KEY_LEFT] = "Left",                    [KEY_RIGHT] = "Right",
 793         [KEY_END] = "End",                      [KEY_DOWN] = "Down",
 794         [KEY_PAGEDOWN] = "PageDown",            [KEY_INSERT] = "Insert",
 795         [KEY_DELETE] = "Delete",                [KEY_MACRO] = "Macro",
 796         [KEY_MUTE] = "Mute",                    [KEY_VOLUMEDOWN] = "VolumeDown",
 797         [KEY_VOLUMEUP] = "VolumeUp",            [KEY_POWER] = "Power",
 798         [KEY_KPEQUAL] = "KPEqual",              [KEY_KPPLUSMINUS] = "KPPlusMinus",
 799         [KEY_PAUSE] = "Pause",                  [KEY_KPCOMMA] = "KPComma",
 800         [KEY_HANGUEL] = "Hangeul",              [KEY_HANJA] = "Hanja",
 801         [KEY_YEN] = "Yen",                      [KEY_LEFTMETA] = "LeftMeta",
 802         [KEY_RIGHTMETA] = "RightMeta",          [KEY_COMPOSE] = "Compose",
 803         [KEY_STOP] = "Stop",                    [KEY_AGAIN] = "Again",
 804         [KEY_PROPS] = "Props",                  [KEY_UNDO] = "Undo",
 805         [KEY_FRONT] = "Front",                  [KEY_COPY] = "Copy",
 806         [KEY_OPEN] = "Open",                    [KEY_PASTE] = "Paste",
 807         [KEY_FIND] = "Find",                    [KEY_CUT] = "Cut",
 808         [KEY_HELP] = "Help",                    [KEY_MENU] = "Menu",
 809         [KEY_CALC] = "Calc",                    [KEY_SETUP] = "Setup",
 810         [KEY_SLEEP] = "Sleep",                  [KEY_WAKEUP] = "WakeUp",
 811         [KEY_FILE] = "File",                    [KEY_SENDFILE] = "SendFile",
 812         [KEY_DELETEFILE] = "DeleteFile",        [KEY_XFER] = "X-fer",
 813         [KEY_PROG1] = "Prog1",                  [KEY_PROG2] = "Prog2",
 814         [KEY_WWW] = "WWW",                      [KEY_MSDOS] = "MSDOS",
 815         [KEY_COFFEE] = "Coffee",                [KEY_ROTATE_DISPLAY] = "RotateDisplay",
 816         [KEY_CYCLEWINDOWS] = "CycleWindows",    [KEY_MAIL] = "Mail",
 817         [KEY_BOOKMARKS] = "Bookmarks",          [KEY_COMPUTER] = "Computer",
 818         [KEY_BACK] = "Back",                    [KEY_FORWARD] = "Forward",
 819         [KEY_CLOSECD] = "CloseCD",              [KEY_EJECTCD] = "EjectCD",
 820         [KEY_EJECTCLOSECD] = "EjectCloseCD",    [KEY_NEXTSONG] = "NextSong",
 821         [KEY_PLAYPAUSE] = "PlayPause",          [KEY_PREVIOUSSONG] = "PreviousSong",
 822         [KEY_STOPCD] = "StopCD",                [KEY_RECORD] = "Record",
 823         [KEY_REWIND] = "Rewind",                [KEY_PHONE] = "Phone",
 824         [KEY_ISO] = "ISOKey",                   [KEY_CONFIG] = "Config",
 825         [KEY_HOMEPAGE] = "HomePage",            [KEY_REFRESH] = "Refresh",
 826         [KEY_EXIT] = "Exit",                    [KEY_MOVE] = "Move",
 827         [KEY_EDIT] = "Edit",                    [KEY_SCROLLUP] = "ScrollUp",
 828         [KEY_SCROLLDOWN] = "ScrollDown",        [KEY_KPLEFTPAREN] = "KPLeftParenthesis",
 829         [KEY_KPRIGHTPAREN] = "KPRightParenthesis", [KEY_NEW] = "New",
 830         [KEY_REDO] = "Redo",                    [KEY_F13] = "F13",
 831         [KEY_F14] = "F14",                      [KEY_F15] = "F15",
 832         [KEY_F16] = "F16",                      [KEY_F17] = "F17",
 833         [KEY_F18] = "F18",                      [KEY_F19] = "F19",
 834         [KEY_F20] = "F20",                      [KEY_F21] = "F21",
 835         [KEY_F22] = "F22",                      [KEY_F23] = "F23",
 836         [KEY_F24] = "F24",                      [KEY_PLAYCD] = "PlayCD",
 837         [KEY_PAUSECD] = "PauseCD",              [KEY_PROG3] = "Prog3",
 838         [KEY_PROG4] = "Prog4",                  [KEY_SUSPEND] = "Suspend",
 839         [KEY_CLOSE] = "Close",                  [KEY_PLAY] = "Play",
 840         [KEY_FASTFORWARD] = "FastForward",      [KEY_BASSBOOST] = "BassBoost",
 841         [KEY_PRINT] = "Print",                  [KEY_HP] = "HP",
 842         [KEY_CAMERA] = "Camera",                [KEY_SOUND] = "Sound",
 843         [KEY_QUESTION] = "Question",            [KEY_EMAIL] = "Email",
 844         [KEY_CHAT] = "Chat",                    [KEY_SEARCH] = "Search",
 845         [KEY_CONNECT] = "Connect",              [KEY_FINANCE] = "Finance",
 846         [KEY_SPORT] = "Sport",                  [KEY_SHOP] = "Shop",
 847         [KEY_ALTERASE] = "AlternateErase",      [KEY_CANCEL] = "Cancel",
 848         [KEY_BRIGHTNESSDOWN] = "BrightnessDown", [KEY_BRIGHTNESSUP] = "BrightnessUp",
 849         [KEY_MEDIA] = "Media",                  [KEY_UNKNOWN] = "Unknown",
 850         [BTN_DPAD_UP] = "BtnDPadUp",            [BTN_DPAD_DOWN] = "BtnDPadDown",
 851         [BTN_DPAD_LEFT] = "BtnDPadLeft",        [BTN_DPAD_RIGHT] = "BtnDPadRight",
 852         [BTN_0] = "Btn0",                       [BTN_1] = "Btn1",
 853         [BTN_2] = "Btn2",                       [BTN_3] = "Btn3",
 854         [BTN_4] = "Btn4",                       [BTN_5] = "Btn5",
 855         [BTN_6] = "Btn6",                       [BTN_7] = "Btn7",
 856         [BTN_8] = "Btn8",                       [BTN_9] = "Btn9",
 857         [BTN_LEFT] = "LeftBtn",                 [BTN_RIGHT] = "RightBtn",
 858         [BTN_MIDDLE] = "MiddleBtn",             [BTN_SIDE] = "SideBtn",
 859         [BTN_EXTRA] = "ExtraBtn",               [BTN_FORWARD] = "ForwardBtn",
 860         [BTN_BACK] = "BackBtn",                 [BTN_TASK] = "TaskBtn",
 861         [BTN_TRIGGER] = "Trigger",              [BTN_THUMB] = "ThumbBtn",
 862         [BTN_THUMB2] = "ThumbBtn2",             [BTN_TOP] = "TopBtn",
 863         [BTN_TOP2] = "TopBtn2",                 [BTN_PINKIE] = "PinkieBtn",
 864         [BTN_BASE] = "BaseBtn",                 [BTN_BASE2] = "BaseBtn2",
 865         [BTN_BASE3] = "BaseBtn3",               [BTN_BASE4] = "BaseBtn4",
 866         [BTN_BASE5] = "BaseBtn5",               [BTN_BASE6] = "BaseBtn6",
 867         [BTN_DEAD] = "BtnDead",                 [BTN_A] = "BtnA",
 868         [BTN_B] = "BtnB",                       [BTN_C] = "BtnC",
 869         [BTN_X] = "BtnX",                       [BTN_Y] = "BtnY",
 870         [BTN_Z] = "BtnZ",                       [BTN_TL] = "BtnTL",
 871         [BTN_TR] = "BtnTR",                     [BTN_TL2] = "BtnTL2",
 872         [BTN_TR2] = "BtnTR2",                   [BTN_SELECT] = "BtnSelect",
 873         [BTN_START] = "BtnStart",               [BTN_MODE] = "BtnMode",
 874         [BTN_THUMBL] = "BtnThumbL",             [BTN_THUMBR] = "BtnThumbR",
 875         [BTN_TOOL_PEN] = "ToolPen",             [BTN_TOOL_RUBBER] = "ToolRubber",
 876         [BTN_TOOL_BRUSH] = "ToolBrush",         [BTN_TOOL_PENCIL] = "ToolPencil",
 877         [BTN_TOOL_AIRBRUSH] = "ToolAirbrush",   [BTN_TOOL_FINGER] = "ToolFinger",
 878         [BTN_TOOL_MOUSE] = "ToolMouse",         [BTN_TOOL_LENS] = "ToolLens",
 879         [BTN_TOUCH] = "Touch",                  [BTN_STYLUS] = "Stylus",
 880         [BTN_STYLUS2] = "Stylus2",              [BTN_TOOL_DOUBLETAP] = "ToolDoubleTap",
 881         [BTN_TOOL_TRIPLETAP] = "ToolTripleTap", [BTN_TOOL_QUADTAP] = "ToolQuadrupleTap",
 882         [BTN_GEAR_DOWN] = "WheelBtn",
 883         [BTN_GEAR_UP] = "Gear up",              [KEY_OK] = "Ok",
 884         [KEY_SELECT] = "Select",                [KEY_GOTO] = "Goto",
 885         [KEY_CLEAR] = "Clear",                  [KEY_POWER2] = "Power2",
 886         [KEY_OPTION] = "Option",                [KEY_INFO] = "Info",
 887         [KEY_TIME] = "Time",                    [KEY_VENDOR] = "Vendor",
 888         [KEY_ARCHIVE] = "Archive",              [KEY_PROGRAM] = "Program",
 889         [KEY_CHANNEL] = "Channel",              [KEY_FAVORITES] = "Favorites",
 890         [KEY_EPG] = "EPG",                      [KEY_PVR] = "PVR",
 891         [KEY_MHP] = "MHP",                      [KEY_LANGUAGE] = "Language",
 892         [KEY_TITLE] = "Title",                  [KEY_SUBTITLE] = "Subtitle",
 893         [KEY_ANGLE] = "Angle",                  [KEY_ZOOM] = "Zoom",
 894         [KEY_MODE] = "Mode",                    [KEY_KEYBOARD] = "Keyboard",
 895         [KEY_SCREEN] = "Screen",                [KEY_PC] = "PC",
 896         [KEY_TV] = "TV",                        [KEY_TV2] = "TV2",
 897         [KEY_VCR] = "VCR",                      [KEY_VCR2] = "VCR2",
 898         [KEY_SAT] = "Sat",                      [KEY_SAT2] = "Sat2",
 899         [KEY_CD] = "CD",                        [KEY_TAPE] = "Tape",
 900         [KEY_RADIO] = "Radio",                  [KEY_TUNER] = "Tuner",
 901         [KEY_PLAYER] = "Player",                [KEY_TEXT] = "Text",
 902         [KEY_DVD] = "DVD",                      [KEY_AUX] = "Aux",
 903         [KEY_MP3] = "MP3",                      [KEY_AUDIO] = "Audio",
 904         [KEY_VIDEO] = "Video",                  [KEY_DIRECTORY] = "Directory",
 905         [KEY_LIST] = "List",                    [KEY_MEMO] = "Memo",
 906         [KEY_CALENDAR] = "Calendar",            [KEY_RED] = "Red",
 907         [KEY_GREEN] = "Green",                  [KEY_YELLOW] = "Yellow",
 908         [KEY_BLUE] = "Blue",                    [KEY_CHANNELUP] = "ChannelUp",
 909         [KEY_CHANNELDOWN] = "ChannelDown",      [KEY_FIRST] = "First",
 910         [KEY_LAST] = "Last",                    [KEY_AB] = "AB",
 911         [KEY_NEXT] = "Next",                    [KEY_RESTART] = "Restart",
 912         [KEY_SLOW] = "Slow",                    [KEY_SHUFFLE] = "Shuffle",
 913         [KEY_BREAK] = "Break",                  [KEY_PREVIOUS] = "Previous",
 914         [KEY_DIGITS] = "Digits",                [KEY_TEEN] = "TEEN",
 915         [KEY_TWEN] = "TWEN",                    [KEY_DEL_EOL] = "DeleteEOL",
 916         [KEY_DEL_EOS] = "DeleteEOS",            [KEY_INS_LINE] = "InsertLine",
 917         [KEY_DEL_LINE] = "DeleteLine",
 918         [KEY_SEND] = "Send",                    [KEY_REPLY] = "Reply",
 919         [KEY_FORWARDMAIL] = "ForwardMail",      [KEY_SAVE] = "Save",
 920         [KEY_DOCUMENTS] = "Documents",          [KEY_SPELLCHECK] = "SpellCheck",
 921         [KEY_LOGOFF] = "Logoff",
 922         [KEY_FN] = "Fn",                        [KEY_FN_ESC] = "Fn+ESC",
 923         [KEY_FN_1] = "Fn+1",                    [KEY_FN_2] = "Fn+2",
 924         [KEY_FN_B] = "Fn+B",                    [KEY_FN_D] = "Fn+D",
 925         [KEY_FN_E] = "Fn+E",                    [KEY_FN_F] = "Fn+F",
 926         [KEY_FN_S] = "Fn+S",
 927         [KEY_FN_F1] = "Fn+F1",                  [KEY_FN_F2] = "Fn+F2",
 928         [KEY_FN_F3] = "Fn+F3",                  [KEY_FN_F4] = "Fn+F4",
 929         [KEY_FN_F5] = "Fn+F5",                  [KEY_FN_F6] = "Fn+F6",
 930         [KEY_FN_F7] = "Fn+F7",                  [KEY_FN_F8] = "Fn+F8",
 931         [KEY_FN_F9] = "Fn+F9",                  [KEY_FN_F10] = "Fn+F10",
 932         [KEY_FN_F11] = "Fn+F11",                [KEY_FN_F12] = "Fn+F12",
 933         [KEY_KBDILLUMTOGGLE] = "KbdIlluminationToggle",
 934         [KEY_KBDILLUMDOWN] = "KbdIlluminationDown",
 935         [KEY_KBDILLUMUP] = "KbdIlluminationUp",
 936         [KEY_SWITCHVIDEOMODE] = "SwitchVideoMode",
 937         [KEY_BUTTONCONFIG] = "ButtonConfig",
 938         [KEY_TASKMANAGER] = "TaskManager",
 939         [KEY_JOURNAL] = "Journal",
 940         [KEY_CONTROLPANEL] = "ControlPanel",
 941         [KEY_APPSELECT] = "AppSelect",
 942         [KEY_SCREENSAVER] = "ScreenSaver",
 943         [KEY_VOICECOMMAND] = "VoiceCommand",
 944         [KEY_BRIGHTNESS_MIN] = "BrightnessMin",
 945         [KEY_BRIGHTNESS_MAX] = "BrightnessMax",
 946         [KEY_BRIGHTNESS_AUTO] = "BrightnessAuto",
 947         [KEY_KBDINPUTASSIST_PREV] = "KbdInputAssistPrev",
 948         [KEY_KBDINPUTASSIST_NEXT] = "KbdInputAssistNext",
 949         [KEY_KBDINPUTASSIST_PREVGROUP] = "KbdInputAssistPrevGroup",
 950         [KEY_KBDINPUTASSIST_NEXTGROUP] = "KbdInputAssistNextGroup",
 951         [KEY_KBDINPUTASSIST_ACCEPT] = "KbdInputAssistAccept",
 952         [KEY_KBDINPUTASSIST_CANCEL] = "KbdInputAssistCancel",
 953 };
 954
 955 static const char *relatives[REL_MAX + 1] = {
 956         [REL_X] = "X",                  [REL_Y] = "Y",
 957         [REL_Z] = "Z",                  [REL_RX] = "Rx",
 958         [REL_RY] = "Ry",                [REL_RZ] = "Rz",
 959         [REL_HWHEEL] = "HWheel",        [REL_DIAL] = "Dial",
 960         [REL_WHEEL] = "Wheel",          [REL_MISC] = "Misc",
 961 };
 962
 963 static const char *absolutes[ABS_CNT] = {
 964         [ABS_X] = "X",                  [ABS_Y] = "Y",
 965         [ABS_Z] = "Z",                  [ABS_RX] = "Rx",
 966         [ABS_RY] = "Ry",                [ABS_RZ] = "Rz",
 967         [ABS_THROTTLE] = "Throttle",    [ABS_RUDDER] = "Rudder",
 968         [ABS_WHEEL] = "Wheel",          [ABS_GAS] = "Gas",
 969         [ABS_BRAKE] = "Brake",          [ABS_HAT0X] = "Hat0X",
 970         [ABS_HAT0Y] = "Hat0Y",          [ABS_HAT1X] = "Hat1X",
 971         [ABS_HAT1Y] = "Hat1Y",          [ABS_HAT2X] = "Hat2X",
 972         [ABS_HAT2Y] = "Hat2Y",          [ABS_HAT3X] = "Hat3X",
 973         [ABS_HAT3Y] = "Hat 3Y",         [ABS_PRESSURE] = "Pressure",
 974         [ABS_DISTANCE] = "Distance",    [ABS_TILT_X] = "XTilt",
 975         [ABS_TILT_Y] = "YTilt",         [ABS_TOOL_WIDTH] = "ToolWidth",
 976         [ABS_VOLUME] = "Volume",        [ABS_MISC] = "Misc",
 977         [ABS_MT_TOUCH_MAJOR] = "MTMajor",
 978         [ABS_MT_TOUCH_MINOR] = "MTMinor",
 979         [ABS_MT_WIDTH_MAJOR] = "MTMajorW",
 980         [ABS_MT_WIDTH_MINOR] = "MTMinorW",
 981         [ABS_MT_ORIENTATION] = "MTOrientation",
 982         [ABS_MT_POSITION_X] = "MTPositionX",
 983         [ABS_MT_POSITION_Y] = "MTPositionY",
 984         [ABS_MT_TOOL_TYPE] = "MTToolType",
 985         [ABS_MT_BLOB_ID] = "MTBlobID",
 986 };
 987
 988 static const char *misc[MSC_MAX + 1] = {
 989         [MSC_SERIAL] = "Serial",        [MSC_PULSELED] = "Pulseled",
 990         [MSC_GESTURE] = "Gesture",      [MSC_RAW] = "RawData"
 991 };
 992
 993 static const char *leds[LED_MAX + 1] = {
 994         [LED_NUML] = "NumLock",         [LED_CAPSL] = "CapsLock",
 995         [LED_SCROLLL] = "ScrollLock",   [LED_COMPOSE] = "Compose",
 996         [LED_KANA] = "Kana",            [LED_SLEEP] = "Sleep",
 997         [LED_SUSPEND] = "Suspend",      [LED_MUTE] = "Mute",
 998         [LED_MISC] = "Misc",
 999 };
1000
1001 static const char *repeats[REP_MAX + 1] = {
1002         [REP_DELAY] = "Delay",          [REP_PERIOD] = "Period"
1003 };
1004
1005 static const char *sounds[SND_MAX + 1] = {
1006         [SND_CLICK] = "Click",          [SND_BELL] = "Bell",
1007         [SND_TONE] = "Tone"
1008 };
1009
1010 static const char **names[EV_MAX + 1] = {
1011         [EV_SYN] = syncs,                       [EV_KEY] = keys,
1012         [EV_REL] = relatives,                   [EV_ABS] = absolutes,
1013         [EV_MSC] = misc,                        [EV_LED] = leds,
1014         [EV_SND] = sounds,                      [EV_REP] = repeats,
1015 };
1016
1017 static void hid_resolv_event(__u8 type, __u16 code, struct seq_file *f)
1018 {
1019         seq_printf(f, "%s.%s", events[type] ? events[type] : "?",
1020                 names[type] ? (names[type][code] ? names[type][code] : "?") : "?");
1021 }
1022
1023 static void hid_dump_input_mapping(struct hid_device *hid, struct seq_file *f)
1024 {
1025         int i, j, k;
1026         struct hid_report *report;
1027         struct hid_usage *usage;
1028
1029         for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
1030                 list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
1031                         for (i = 0; i < report->maxfield; i++) {
1032                                 for ( j = 0; j < report->field[i]->maxusage; j++) {
1033                                         usage = report->field[i]->usage + j;
1034                                         hid_resolv_usage(usage->hid, f);
1035                                         seq_printf(f, " ---> ");
1036                                         hid_resolv_event(usage->type, usage->code, f);
1037                                         seq_printf(f, "\n");
1038                                 }
1039                         }
1040                 }
1041         }
1042
1043 }
1044
1045 static int hid_debug_rdesc_show(struct seq_file *f, void *p)
1046 {
1047         struct hid_device *hdev = f->private;
1048         const __u8 *rdesc = hdev->rdesc;
1049         unsigned rsize = hdev->rsize;
1050         int i;
1051
1052         if (!rdesc) {
1053                 rdesc = hdev->dev_rdesc;
1054                 rsize = hdev->dev_rsize;
1055         }
1056
1057         /* dump HID report descriptor */
1058         for (i = 0; i < rsize; i++)
1059                 seq_printf(f, "%02x ", rdesc[i]);
1060         seq_printf(f, "\n\n");
1061
1062         /* dump parsed data and input mappings */
1063         if (down_interruptible(&hdev->driver_input_lock))
1064                 return 0;
1065
1066         hid_dump_device(hdev, f);
1067         seq_printf(f, "\n");
1068         hid_dump_input_mapping(hdev, f);
1069
1070         up(&hdev->driver_input_lock);
1071
1072         return 0;
1073 }
1074
1075 static int hid_debug_events_open(struct inode *inode, struct file *file)
1076 {
1077         int err = 0;
1078         struct hid_debug_list *list;
1079         unsigned long flags;
1080
1081         if (!(list = kzalloc(sizeof(struct hid_debug_list), GFP_KERNEL))) {
1082                 err = -ENOMEM;
1083                 goto out;
1084         }
1085
1086         err = kfifo_alloc(&list->hid_debug_fifo, HID_DEBUG_FIFOSIZE, GFP_KERNEL);
1087         if (err) {
1088                 kfree(list);
1089                 goto out;
1090         }
1091         list->hdev = (struct hid_device *) inode->i_private;
1092         file->private_data = list;
1093         mutex_init(&list->read_mutex);
1094
1095         spin_lock_irqsave(&list->hdev->debug_list_lock, flags);
1096         list_add_tail(&list->node, &list->hdev->debug_list);
1097         spin_unlock_irqrestore(&list->hdev->debug_list_lock, flags);
1098
1099 out:
1100         return err;
1101 }
1102
1103 static ssize_t hid_debug_events_read(struct file *file, char __user *buffer,
1104                 size_t count, loff_t *ppos)
1105 {
1106         struct hid_debug_list *list = file->private_data;
1107         int ret = 0, copied;
1108         DECLARE_WAITQUEUE(wait, current);
1109
1110         mutex_lock(&list->read_mutex);
1111         if (kfifo_is_empty(&list->hid_debug_fifo)) {
1112                 add_wait_queue(&list->hdev->debug_wait, &wait);
1113                 set_current_state(TASK_INTERRUPTIBLE);
1114
1115                 while (kfifo_is_empty(&list->hid_debug_fifo)) {
1116                         if (file->f_flags & O_NONBLOCK) {
1117                                 ret = -EAGAIN;
1118                                 break;
1119                         }
1120
1121                         if (signal_pending(current)) {
1122                                 ret = -ERESTARTSYS;
1123                                 break;
1124                         }
1125
1126                         /* if list->hdev is NULL we cannot remove_wait_queue().
1127                          * if list->hdev->debug is 0 then hid_debug_unregister()
1128                          * was already called and list->hdev is being destroyed.
1129                          * if we add remove_wait_queue() here we can hit a race.
1130                          */
1131                         if (!list->hdev || !list->hdev->debug) {
1132                                 ret = -EIO;
1133                                 set_current_state(TASK_RUNNING);
1134                                 goto out;
1135                         }
1136
1137                         /* allow O_NONBLOCK from other threads */
1138                         mutex_unlock(&list->read_mutex);
1139                         schedule();
1140                         mutex_lock(&list->read_mutex);
1141                         set_current_state(TASK_INTERRUPTIBLE);
1142                 }
1143
1144                 __set_current_state(TASK_RUNNING);
1145                 remove_wait_queue(&list->hdev->debug_wait, &wait);
1146
1147                 if (ret)
1148                         goto out;
1149         }
1150
1151         /* pass the fifo content to userspace, locking is not needed with only
1152          * one concurrent reader and one concurrent writer
1153          */
1154         ret = kfifo_to_user(&list->hid_debug_fifo, buffer, count, &copied);
1155         if (ret)
1156                 goto out;
1157         ret = copied;
1158 out:
1159         mutex_unlock(&list->read_mutex);
1160         return ret;
1161 }
1162
1163 static __poll_t hid_debug_events_poll(struct file *file, poll_table *wait)
1164 {
1165         struct hid_debug_list *list = file->private_data;
1166
1167         poll_wait(file, &list->hdev->debug_wait, wait);
1168         if (!kfifo_is_empty(&list->hid_debug_fifo))
1169                 return EPOLLIN | EPOLLRDNORM;
1170         if (!list->hdev->debug)
1171                 return EPOLLERR | EPOLLHUP;
1172         return 0;
1173 }
1174
1175 static int hid_debug_events_release(struct inode *inode, struct file *file)
1176 {
1177         struct hid_debug_list *list = file->private_data;
1178         unsigned long flags;
1179
1180         spin_lock_irqsave(&list->hdev->debug_list_lock, flags);
1181         list_del(&list->node);
1182         spin_unlock_irqrestore(&list->hdev->debug_list_lock, flags);
1183         kfifo_free(&list->hid_debug_fifo);
1184         kfree(list);
1185
1186         return 0;
1187 }
1188
1189 DEFINE_SHOW_ATTRIBUTE(hid_debug_rdesc);
1190
1191 static const struct file_operations hid_debug_events_fops = {
1192         .owner =        THIS_MODULE,
1193         .open           = hid_debug_events_open,
1194         .read           = hid_debug_events_read,
1195         .poll           = hid_debug_events_poll,
1196         .release        = hid_debug_events_release,
1197         .llseek         = noop_llseek,
1198 };
1199
1200
1201 void hid_debug_register(struct hid_device *hdev, const char *name)
1202 {
1203         hdev->debug_dir = debugfs_create_dir(name, hid_debug_root);
1204         hdev->debug_rdesc = debugfs_create_file("rdesc", 0400,
1205                         hdev->debug_dir, hdev, &hid_debug_rdesc_fops);
1206         hdev->debug_events = debugfs_create_file("events", 0400,
1207                         hdev->debug_dir, hdev, &hid_debug_events_fops);
1208         hdev->debug = 1;
1209 }
1210
1211 void hid_debug_unregister(struct hid_device *hdev)
1212 {
1213         hdev->debug = 0;
1214         wake_up_interruptible(&hdev->debug_wait);
1215         debugfs_remove(hdev->debug_rdesc);
1216         debugfs_remove(hdev->debug_events);
1217         debugfs_remove(hdev->debug_dir);
1218 }
1219
1220 void hid_debug_init(void)
1221 {
1222         hid_debug_root = debugfs_create_dir("hid", NULL);
1223 }
1224
1225 void hid_debug_exit(void)
1226 {
1227         debugfs_remove_recursive(hid_debug_root);
1228 }