60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
#ifndef _MATRIX_KEYPAD_H
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#define _MATRIX_KEYPAD_H
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#define MATRIX_MAX_ROWS 32
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#define MATRIX_MAX_COLS 32
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#define KEY(row, col, val) ((((row) & (MATRIX_MAX_ROWS - 1)) << 24) |\
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(((col) & (MATRIX_MAX_COLS - 1)) << 16) |\
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((val) & 0xffff))
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#define KEY_ROW(k) (((k) >> 24) & 0xff)
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#define KEY_COL(k) (((k) >> 16) & 0xff)
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#define KEY_VAL(k) ((k) & 0xffff)
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#define MATRIX_SCAN_CODE(row, col, row_shift) (((row) << (row_shift)) + (col))
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/**
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* struct matrix_keymap_data - keymap for matrix keyboards
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* @keymap: pointer to array of uint32 values encoded with KEY() macro
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* representing keymap
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* @keymap_size: number of entries (initialized) in this keymap
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*
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* This structure is supposed to be used by platform code to supply
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* keymaps to drivers that implement matrix-like keypads/keyboards.
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*/
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struct matrix_keymap_data {
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const uint32_t *keymap;
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unsigned int keymap_size;
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};
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/**
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* matrix_keypad_build_keymap - convert platform keymap into matrix keymap
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* @keymap_data: keymap supplied by the platform code
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* @row_shift: number of bits to shift row value by to advance to the next
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* line in the keymap
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* @keymap: expanded version of keymap that is suitable for use by
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* matrix keyboad driver
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* This function converts platform keymap (encoded with KEY() macro) into
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* an array of keycodes that is suitable for using in a standard matrix
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* keyboard driver that uses row and col as indices.
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*/
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static inline void
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matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
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unsigned int row_shift,
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unsigned short *keymap)
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{
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int i;
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for (i = 0; i < keymap_data->keymap_size; i++) {
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unsigned int key = keymap_data->keymap[i];
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unsigned int row = KEY_ROW(key);
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unsigned int col = KEY_COL(key);
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unsigned short code = KEY_VAL(key);
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keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
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}
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}
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#endif /* _MATRIX_KEYPAD_H */
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