matrix_keypad.h

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#ifndef _MATRIX_KEYPAD_H
#define _MATRIX_KEYPAD_H

#include <linux/types.h>
#include <linux/input.h>
#include <linux/of.h>

#define MATRIX_MAX_ROWS     32
#define MATRIX_MAX_COLS     32

#define KEY(row, col, val)  ((((row) & (MATRIX_MAX_ROWS - 1)) << 24) |\
                 (((col) & (MATRIX_MAX_COLS - 1)) << 16) |\
                 ((val) & 0xffff))

#define KEY_ROW(k)      (((k) >> 24) & 0xff)
#define KEY_COL(k)      (((k) >> 16) & 0xff)
#define KEY_VAL(k)      ((k) & 0xffff)

#define MATRIX_SCAN_CODE(row, col, row_shift)   (((row) << (row_shift)) + (col))

struct matrix_keymap_data {
    const uint32_t *keymap;
    unsigned int    keymap_size;
};

struct matrix_keypad_platform_data {
    const struct matrix_keymap_data *keymap_data;

    const unsigned int *row_gpios;
    const unsigned int *col_gpios;

    unsigned int    num_row_gpios;
    unsigned int    num_col_gpios;

    unsigned int    col_scan_delay_us;

    /* key debounce interval in milli-second */
    unsigned int    debounce_ms;

    unsigned int    clustered_irq;
    unsigned int    clustered_irq_flags;

    bool        active_low;
    bool        wakeup;
    bool        no_autorepeat;
};

int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
                   const char *keymap_name,
                   unsigned int rows, unsigned int cols,
                   unsigned short *keymap,
                   struct input_dev *input_dev);

#endif /* _MATRIX_KEYPAD_H */