Edit File: matrix_keypad.h
#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 - 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; }; /** * struct matrix_keypad_platform_data - platform-dependent keypad data * @keymap_data: pointer to &matrix_keymap_data * @row_gpios: pointer to array of gpio numbers representing rows * @col_gpios: pointer to array of gpio numbers reporesenting colums * @num_row_gpios: actual number of row gpios used by device * @num_col_gpios: actual number of col gpios used by device * @col_scan_delay_us: delay, measured in microseconds, that is * needed before we can keypad after activating column gpio * @debounce_ms: debounce interval in milliseconds * @clustered_irq: may be specified if interrupts of all row/column GPIOs * are bundled to one single irq * @clustered_irq_flags: flags that are needed for the clustered irq * @active_low: gpio polarity * @wakeup: controls whether the device should be set up as wakeup * source * @no_autorepeat: disable key autorepeat * * This structure represents platform-specific data that use used by * matrix_keypad driver to perform proper initialization. */ 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); #ifdef CONFIG_OF /** * matrix_keypad_parse_of_params() - Read parameters from matrix-keypad node * * @dev: Device containing of_node * @rows: Returns number of matrix rows * @cols: Returns number of matrix columns * @return 0 if OK, <0 on error */ int matrix_keypad_parse_of_params(struct device *dev, unsigned int *rows, unsigned int *cols); #else static inline int matrix_keypad_parse_of_params(struct device *dev, unsigned int *rows, unsigned int *cols) { return -ENOSYS; } #endif /* CONFIG_OF */ #endif /* _MATRIX_KEYPAD_H */