Keyboard Matrix API

Keyboard Matrix API . More...

Data Structures
struct	input_kbd_matrix_api
	Keyboard matrix internal APIs. More...
struct	input_kbd_matrix_common_config
	Common keyboard matrix config. More...
struct	input_kbd_matrix_common_data
	Common keyboard matrix data. More...

Macros
#define	INPUT_KBD_MATRIX_COLUMN_DRIVE_NONE   -1
	Special drive_column argument for not driving any column.
#define	INPUT_KBD_MATRIX_COLUMN_DRIVE_ALL   -2
	Special drive_column argument for driving all the columns.
#define	INPUT_KBD_MATRIX_SCAN_OCURRENCES   30U
	Number of tracked scan cycles.
#define	PRIkbdrow   "02" PRIx8
#define	INPUT_KBD_ACTUAL_KEY_MASK_CONST
#define	INPUT_KBD_MATRIX_ROW_BITS   NUM_BITS(kbd_row_t)
	Maximum number of rows.
#define	INPUT_KBD_MATRIX_DATA_NAME(node_id, name)
#define	INPUT_KBD_MATRIX_DT_DEFINE_ROW_COL(node_id, _row_size, _col_size)
	Defines the common keyboard matrix support data from devicetree, specify row and col count.
#define	INPUT_KBD_MATRIX_DT_DEFINE(node_id)
	Defines the common keyboard matrix support data from devicetree.
#define	INPUT_KBD_MATRIX_DT_INST_DEFINE_ROW_COL(inst, row_size, col_size)
	Defines the common keyboard matrix support data from devicetree instance, specify row and col count.
#define	INPUT_KBD_MATRIX_DT_INST_DEFINE(inst)
	Defines the common keyboard matrix support data from devicetree instance.
#define	INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT_ROW_COL(node_id, _api, _row_size, _col_size)
	Initialize common keyboard matrix config from devicetree, specify row and col count.
#define	INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT(node_id, api)
	Initialize common keyboard matrix config from devicetree.
#define	INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT_ROW_COL(inst, api, row_size, col_size)
	Initialize common keyboard matrix config from devicetree instance, specify row and col count.
#define	INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT(inst, api)
	Initialize common keyboard matrix config from devicetree instance.
#define	INPUT_KBD_STRUCT_CHECK(config, data)
	Validate the offset of the common data structures.

Typedefs
typedef uint8_t	kbd_row_t
	Row entry data type.

Functions
int	input_kbd_matrix_actual_key_mask_set (const struct device *dev, uint8_t row, uint8_t col, bool enabled)
	Enables or disables a specific row, column combination in the actual key mask.
void	input_kbd_matrix_poll_start (const struct device *dev)
	Start scanning the keyboard matrix.
void	input_kbd_matrix_drive_column_hook (const struct device *dev, int col)
	Drive column hook.
int	input_kbd_matrix_common_init (const struct device *dev)
	Common function to initialize a keyboard matrix device at init time.

Detailed Description

Keyboard Matrix API .

Macro Definition Documentation

INPUT_KBD_ACTUAL_KEY_MASK_CONST

#define INPUT_KBD_ACTUAL_KEY_MASK_CONST

#include <zephyr/input/input_kbd_matrix.h>

INPUT_KBD_MATRIX_COLUMN_DRIVE_ALL

#define INPUT_KBD_MATRIX_COLUMN_DRIVE_ALL   -2

#include <zephyr/input/input_kbd_matrix.h>

Special drive_column argument for driving all the columns.

INPUT_KBD_MATRIX_COLUMN_DRIVE_NONE

#define INPUT_KBD_MATRIX_COLUMN_DRIVE_NONE   -1

#include <zephyr/input/input_kbd_matrix.h>

Special drive_column argument for not driving any column.

INPUT_KBD_MATRIX_DATA_NAME

#define INPUT_KBD_MATRIX_DATA_NAME	(		node_id,
			name )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        _CONCAT(__input_kbd_matrix_, \
                _CONCAT(name, DEVICE_DT_NAME_GET(node_id)))

INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT

#define INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT	(		node_id,
			api )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT_ROW_COL( \
                node_id, api, DT_PROP(node_id, row_size), DT_PROP(node_id, col_size))

Initialize common keyboard matrix config from devicetree.

Parameters

node_id	The devicetree node identifier.
api	Pointer to a input_kbd_matrix_api structure.

INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT_ROW_COL

#define INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT_ROW_COL	(		node_id,
			_api,
			_row_size,
			_col_size )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        { \
                .api = _api, \
                .row_size = _row_size, \
                .col_size = _col_size, \
                .poll_period_us = DT_PROP(node_id, poll_period_ms) * USEC_PER_MSEC, \
                .poll_timeout_ms = DT_PROP(node_id, poll_timeout_ms), \
                .debounce_down_us = DT_PROP(node_id, debounce_down_ms) * USEC_PER_MSEC, \
                .debounce_up_us = DT_PROP(node_id, debounce_up_ms) * USEC_PER_MSEC, \
                .settle_time_us = DT_PROP(node_id, settle_time_us), \
                .ghostkey_check = !DT_PROP(node_id, no_ghostkey_check), \
                IF_ENABLED(DT_NODE_HAS_PROP(node_id, actual_key_mask), ( \
                .actual_key_mask = INPUT_KBD_MATRIX_DATA_NAME(node_id, actual_key_mask), \
                )) \
                \
                .matrix_stable_state = INPUT_KBD_MATRIX_DATA_NAME(node_id, stable_state), \
                .matrix_unstable_state = INPUT_KBD_MATRIX_DATA_NAME(node_id, unstable_state), \
                .matrix_previous_state = INPUT_KBD_MATRIX_DATA_NAME(node_id, previous_state), \
                .matrix_new_state = INPUT_KBD_MATRIX_DATA_NAME(node_id, new_state), \
                .scan_cycle_idx = INPUT_KBD_MATRIX_DATA_NAME(node_id, scan_cycle_idx), \
        }

Initialize common keyboard matrix config from devicetree, specify row and col count.

Parameters

node_id	The devicetree node identifier.
_api	Pointer to a input_kbd_matrix_api structure.
_row_size	The matrix row count.
_col_size	The matrix column count.

INPUT_KBD_MATRIX_DT_DEFINE

#define INPUT_KBD_MATRIX_DT_DEFINE

(

node_id

)

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_DEFINE_ROW_COL( \
                node_id, DT_PROP(node_id, row_size), DT_PROP(node_id, col_size))

Defines the common keyboard matrix support data from devicetree.

INPUT_KBD_MATRIX_DT_DEFINE_ROW_COL

#define INPUT_KBD_MATRIX_DT_DEFINE_ROW_COL	(		node_id,
			_row_size,
			_col_size )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        BUILD_ASSERT(IN_RANGE(_row_size, 1, INPUT_KBD_MATRIX_ROW_BITS), "invalid row-size"); \
        BUILD_ASSERT(IN_RANGE(_col_size, 1, UINT8_MAX), "invalid col-size"); \
        IF_ENABLED(DT_NODE_HAS_PROP(node_id, actual_key_mask), ( \
        BUILD_ASSERT(DT_PROP_LEN(node_id, actual_key_mask) == _col_size, \
                     "actual-key-mask size does not match the number of columns"); \
        static INPUT_KBD_ACTUAL_KEY_MASK_CONST kbd_row_t \
                INPUT_KBD_MATRIX_DATA_NAME(node_id, actual_key_mask)[_col_size] = \
                        DT_PROP(node_id, actual_key_mask); \
        )) \
        static kbd_row_t INPUT_KBD_MATRIX_DATA_NAME(node_id, stable_state)[_col_size]; \
        static kbd_row_t INPUT_KBD_MATRIX_DATA_NAME(node_id, unstable_state)[_col_size]; \
        static kbd_row_t INPUT_KBD_MATRIX_DATA_NAME(node_id, previous_state)[_col_size]; \
        static kbd_row_t INPUT_KBD_MATRIX_DATA_NAME(node_id, new_state)[_col_size]; \
        static uint8_t INPUT_KBD_MATRIX_DATA_NAME(node_id, scan_cycle_idx)[_row_size * _col_size];

Defines the common keyboard matrix support data from devicetree, specify row and col count.

INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT

#define INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT	(		inst,
			api )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT(DT_DRV_INST(inst), api)

Initialize common keyboard matrix config from devicetree instance.

Parameters

inst	Instance.
api	Pointer to a input_kbd_matrix_api structure.

INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT_ROW_COL

#define INPUT_KBD_MATRIX_DT_INST_COMMON_CONFIG_INIT_ROW_COL	(		inst,
			api,
			row_size,
			col_size )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_COMMON_CONFIG_INIT_ROW_COL(DT_DRV_INST(inst), api, row_size, col_size)

Initialize common keyboard matrix config from devicetree instance, specify row and col count.

Parameters

inst	Instance.
api	Pointer to a input_kbd_matrix_api structure.
row_size	The matrix row count.
col_size	The matrix column count.

INPUT_KBD_MATRIX_DT_INST_DEFINE

#define INPUT_KBD_MATRIX_DT_INST_DEFINE

(

inst

)

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_DEFINE(DT_DRV_INST(inst))

Defines the common keyboard matrix support data from devicetree instance.

Parameters

inst

Instance.

INPUT_KBD_MATRIX_DT_INST_DEFINE_ROW_COL

#define INPUT_KBD_MATRIX_DT_INST_DEFINE_ROW_COL	(		inst,
			row_size,
			col_size )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        INPUT_KBD_MATRIX_DT_DEFINE_ROW_COL(DT_DRV_INST(inst), row_size, col_size)

Defines the common keyboard matrix support data from devicetree instance, specify row and col count.

Parameters

inst	Instance.
row_size	The matrix row count.
col_size	The matrix column count.

INPUT_KBD_MATRIX_ROW_BITS

#define INPUT_KBD_MATRIX_ROW_BITS   NUM_BITS(kbd_row_t)

#include <zephyr/input/input_kbd_matrix.h>

Maximum number of rows.

INPUT_KBD_MATRIX_SCAN_OCURRENCES

#define INPUT_KBD_MATRIX_SCAN_OCURRENCES   30U

#include <zephyr/input/input_kbd_matrix.h>

Number of tracked scan cycles.

INPUT_KBD_STRUCT_CHECK

#define INPUT_KBD_STRUCT_CHECK	(		config,
			data )

#include <zephyr/input/input_kbd_matrix.h>

Value:

        BUILD_ASSERT(offsetof(config, common) == 0, \
                     "struct input_kbd_matrix_common_config must be placed first"); \
        BUILD_ASSERT(offsetof(data, common) == 0, \
                     "struct input_kbd_matrix_common_data must be placed first")

Validate the offset of the common data structures.

Parameters

config	Name of the config structure.
data	Name of the data structure.

PRIkbdrow

#define PRIkbdrow   "02" PRIx8

#include <zephyr/input/input_kbd_matrix.h>

Typedef Documentation

kbd_row_t

typedef uint8_t kbd_row_t

#include <zephyr/input/input_kbd_matrix.h>

Row entry data type.

Function Documentation

input_kbd_matrix_actual_key_mask_set()

int input_kbd_matrix_actual_key_mask_set	(	const struct device *	dev,
		uint8_t	row,
		uint8_t	col,
		bool	enabled )

#include <zephyr/input/input_kbd_matrix.h>

Enables or disables a specific row, column combination in the actual key mask.

This allows enabling or disabling specific row, column combination in the actual key mask in runtime. It can be useful if some of the keys are not present in some configuration, and the specific configuration is determined in runtime. Requires

CONFIG_INPUT_KBD_ACTUAL_KEY_MASK_DYNAMIC 

to be enabled.

Parameters

dev	Pointer to the keyboard matrix device.
row	The matrix row to enable or disable.
col	The matrix column to enable or disable.
enabled	Whether the specified row, col has to be enabled or disabled.

Return values

0	If the change is successful.
-errno	Negative errno if row or col are out of range for the device.

input_kbd_matrix_common_init()

int input_kbd_matrix_common_init

(

const struct device *

dev

)

#include <zephyr/input/input_kbd_matrix.h>

Common function to initialize a keyboard matrix device at init time.

This function must be called at the end of the device init function.

Parameters

dev	Keyboard matrix device instance.

Return values

0	If initialized successfully.
-errno	Negative errno in case of failure.

input_kbd_matrix_drive_column_hook()

void input_kbd_matrix_drive_column_hook	(	const struct device *	dev,
		int	col )

#include <zephyr/input/input_kbd_matrix.h>

Drive column hook.

This can be implemented by the application to handle column selection quirks. Called after the driver specific drive_column function. Requires

CONFIG_INPUT_KBD_DRIVE_COLUMN_HOOK 

to be enabled.

Parameters

dev	Keyboard matrix device instance.
col	The column to drive, or INPUT_KBD_MATRIX_COLUMN_DRIVE_NONE or INPUT_KBD_MATRIX_COLUMN_DRIVE_ALL.

input_kbd_matrix_poll_start()

void input_kbd_matrix_poll_start

(

const struct device *

dev

)

#include <zephyr/input/input_kbd_matrix.h>

Start scanning the keyboard matrix.

Starts the keyboard matrix scanning cycle, this should be called in reaction of a press event, after the device has been put in detect mode.

Parameters

dev	Keyboard matrix device instance.