include/linux/platform_data/keypad-omap.h

Source file repositories/reference/linux-study-clean/include/linux/platform_data/keypad-omap.h

File Facts

System
Linux kernel
Corpus path
include/linux/platform_data/keypad-omap.h
Extension
.h
Size
1253 bytes
Lines
45
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 omap_kp_platform_data {
	int rows;
	int cols;
	const struct matrix_keymap_data *keymap_data;
	bool rep;
	unsigned long delay;
	bool dbounce;
};

/* Group (0..3) -- when multiple keys are pressed, only the
 * keys pressed in the same group are considered as pressed. This is
 * in order to workaround certain crappy HW designs that produce ghost
 * keypresses. Two free bits, not used by neither row/col nor keynum,
 * must be available for use as group bits. The below GROUP_SHIFT
 * macro definition is based on some prior knowledge of the
 * matrix_keypad defined KEY() macro internals.
 */
#define GROUP_SHIFT	14
#define GROUP_0		(0 << GROUP_SHIFT)
#define GROUP_1		(1 << GROUP_SHIFT)
#define GROUP_2		(2 << GROUP_SHIFT)
#define GROUP_3		(3 << GROUP_SHIFT)
#define GROUP_MASK	GROUP_3
#if KEY_MAX & GROUP_MASK
#error Group bits in conflict with keynum bits
#endif


#endif

Annotation

Implementation Notes