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#ifndef _MATRIX_KEYPAD_H
#define _MATRIX_KEYPAD_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 - keymap for matrix keyboards
* @keymap: pointer to array of uint32 values encoded with KEY() macro
* representing keymap
* @keymap_size: number of entries (initialized) in this keymap
*
* This structure is supposed to be used by platform code to supply
* keymaps to drivers that implement matrix-like keypads/keyboards.
*/
struct matrix_keymap_data {
const uint32_t *keymap;
unsigned int keymap_size;
};
/**
* matrix_keypad_build_keymap - convert platform keymap into matrix keymap
* @keymap_data: keymap supplied by the platform code
* @row_shift: number of bits to shift row value by to advance to the next
* line in the keymap
* @keymap: expanded version of keymap that is suitable for use by
* matrix keyboad driver
* This function converts platform keymap (encoded with KEY() macro) into
* an array of keycodes that is suitable for using in a standard matrix
* keyboard driver that uses row and col as indices.
*/
static inline void
matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
unsigned int row_shift,
unsigned short *keymap)
{
int i;
for (i = 0; i < keymap_data->keymap_size; i++) {
unsigned int key = keymap_data->keymap[i];
unsigned int row = KEY_ROW(key);
unsigned int col = KEY_COL(key);
unsigned short code = KEY_VAL(key);
keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
}
}
#endif /* _MATRIX_KEYPAD_H */
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