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linux/drivers/hid/hid-debug.c
Henrik Rydberg 8db089d1b0 HID: hid-debug: Show rdesc for unclaimed devices 
Since commit a7197c2e, the raw report descriptor is available also for
unclaimed devices. This patchs make it show in the rdesc debugfs node.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-08-27 08:01:21 -07:00

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/*
* (c) 1999 Andreas Gal <gal@cs.uni-magdeburg.de>
* (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
* (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 <vojtech@ucw.cz>, 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);
}
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