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