include/uapi/linux/hiddev.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/hiddev.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/hiddev.h
Extension
.h
Size
6360 bytes
Lines
214
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hiddev_event {
	unsigned hid;
	signed int value;
};

struct hiddev_devinfo {
	__u32 bustype;
	__u32 busnum;
	__u32 devnum;
	__u32 ifnum;
	__s16 vendor;
	__s16 product;
	__s16 version;
	__u32 num_applications;
};

struct hiddev_collection_info {
	__u32 index;
	__u32 type;
	__u32 usage;
	__u32 level;
};

#define HID_STRING_SIZE 256
struct hiddev_string_descriptor {
	__s32 index;
	char value[HID_STRING_SIZE];
};

struct hiddev_report_info {
	__u32 report_type;
	__u32 report_id;
	__u32 num_fields;
};

/* To do a GUSAGE/SUSAGE, fill in at least usage_code,  report_type and 
 * report_id.  Set report_id to REPORT_ID_UNKNOWN if the rest of the fields 
 * are unknown.  Otherwise use a usage_ref struct filled in from a previous 
 * successful GUSAGE call to save time.  To actually send a value to the
 * device, perform a SUSAGE first, followed by a SREPORT.  An INITREPORT or a
 * GREPORT isn't necessary for a GUSAGE to return valid data.
 */
#define HID_REPORT_ID_UNKNOWN 0xffffffff
#define HID_REPORT_ID_FIRST   0x00000100
#define HID_REPORT_ID_NEXT    0x00000200
#define HID_REPORT_ID_MASK    0x000000ff
#define HID_REPORT_ID_MAX     0x000000ff

#define HID_REPORT_TYPE_INPUT	1
#define HID_REPORT_TYPE_OUTPUT	2
#define HID_REPORT_TYPE_FEATURE	3
#define HID_REPORT_TYPE_MIN     1
#define HID_REPORT_TYPE_MAX     3

struct hiddev_field_info {
	__u32 report_type;
	__u32 report_id;
	__u32 field_index;
	__u32 maxusage;
	__u32 flags;
	__u32 physical;		/* physical usage for this field */
	__u32 logical;		/* logical usage for this field */
	__u32 application;		/* application usage for this field */
	__s32 logical_minimum;
	__s32 logical_maximum;
	__s32 physical_minimum;
	__s32 physical_maximum;
	__u32 unit_exponent;
	__u32 unit;
};

/* Fill in report_type, report_id and field_index to get the information on a
 * field.
 */
#define HID_FIELD_CONSTANT		0x001
#define HID_FIELD_VARIABLE		0x002
#define HID_FIELD_RELATIVE		0x004
#define HID_FIELD_WRAP			0x008	
#define HID_FIELD_NONLINEAR		0x010
#define HID_FIELD_NO_PREFERRED		0x020
#define HID_FIELD_NULL_STATE		0x040
#define HID_FIELD_VOLATILE		0x080
#define HID_FIELD_BUFFERED_BYTE		0x100

struct hiddev_usage_ref {
	__u32 report_type;
	__u32 report_id;
	__u32 field_index;
	__u32 usage_index;
	__u32 usage_code;

Annotation

Implementation Notes