drivers/input/input-compat.h

Source file repositories/reference/linux-study-clean/drivers/input/input-compat.h

File Facts

System
Linux kernel
Corpus path
drivers/input/input-compat.h
Extension
.h
Size
1717 bytes
Lines
82
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct input_event_compat {
	compat_ulong_t sec;
	compat_ulong_t usec;
	__u16 type;
	__u16 code;
	__s32 value;
};

struct ff_periodic_effect_compat {
	__u16 waveform;
	__u16 period;
	__s16 magnitude;
	__s16 offset;
	__u16 phase;

	struct ff_envelope envelope;

	__u32 custom_len;
	compat_uptr_t custom_data;
};

struct ff_effect_compat {
	__u16 type;
	__s16 id;
	__u16 direction;
	struct ff_trigger trigger;
	struct ff_replay replay;

	union {
		struct ff_constant_effect constant;
		struct ff_ramp_effect ramp;
		struct ff_periodic_effect_compat periodic;
		struct ff_condition_effect condition[2]; /* One for each axis */
		struct ff_rumble_effect rumble;
	} u;
};

static inline size_t input_event_size(void)
{
	return (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) ?
		sizeof(struct input_event_compat) : sizeof(struct input_event);
}

#else

static inline size_t input_event_size(void)
{
	return sizeof(struct input_event);
}

#endif /* CONFIG_COMPAT */

int input_event_from_user(const char __user *buffer,
			 struct input_event *event);

int input_event_to_user(char __user *buffer,
			const struct input_event *event);

int input_ff_effect_from_user(const char __user *buffer, size_t size,
			      struct ff_effect *effect);

int input_bits_to_string(char *buf, int buf_size, unsigned long bits,
                         bool skip_empty);

#endif /* _INPUT_COMPAT_H */

Annotation

Implementation Notes