include/linux/input/matrix_keypad.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _MATRIX_KEYPAD_H
   3 #define _MATRIX_KEYPAD_H
   4
   5 #include <linux/types.h>
   6 #include <linux/input.h>
   7 #include <linux/of.h>
   8
   9 #define MATRIX_MAX_ROWS         32
  10 #define MATRIX_MAX_COLS         32
  11
  12 #define KEY(row, col, val)      ((((row) & (MATRIX_MAX_ROWS - 1)) << 24) |\
  13                                  (((col) & (MATRIX_MAX_COLS - 1)) << 16) |\
  14                                  ((val) & 0xffff))
  15
  16 #define KEY_ROW(k)              (((k) >> 24) & 0xff)
  17 #define KEY_COL(k)              (((k) >> 16) & 0xff)
  18 #define KEY_VAL(k)              ((k) & 0xffff)
  19
  20 #define MATRIX_SCAN_CODE(row, col, row_shift)   (((row) << (row_shift)) + (col))
  21
  22 /**
  23  * struct matrix_keymap_data - keymap for matrix keyboards
  24  * @keymap: pointer to array of uint32 values encoded with KEY() macro
  25  *      representing keymap
  26  * @keymap_size: number of entries (initialized) in this keymap
  27  *
  28  * This structure is supposed to be used by platform code to supply
  29  * keymaps to drivers that implement matrix-like keypads/keyboards.
  30  */
  31 struct matrix_keymap_data {
  32         const uint32_t *keymap;
  33         unsigned int    keymap_size;
  34 };
  35
  36 /**
  37  * struct matrix_keypad_platform_data - platform-dependent keypad data
  38  * @keymap_data: pointer to &matrix_keymap_data
  39  * @row_gpios: pointer to array of gpio numbers representing rows
  40  * @col_gpios: pointer to array of gpio numbers reporesenting colums
  41  * @num_row_gpios: actual number of row gpios used by device
  42  * @num_col_gpios: actual number of col gpios used by device
  43  * @col_scan_delay_us: delay, measured in microseconds, that is
  44  *      needed before we can keypad after activating column gpio
  45  * @debounce_ms: debounce interval in milliseconds
  46  * @clustered_irq: may be specified if interrupts of all row/column GPIOs
  47  *      are bundled to one single irq
  48  * @clustered_irq_flags: flags that are needed for the clustered irq
  49  * @active_low: gpio polarity
  50  * @wakeup: controls whether the device should be set up as wakeup
  51  *      source
  52  * @no_autorepeat: disable key autorepeat
  53  * @drive_inactive_cols: drive inactive columns during scan, rather than
  54  *      making them inputs.
  55  *
  56  * This structure represents platform-specific data that use used by
  57  * matrix_keypad driver to perform proper initialization.
  58  */
  59 struct matrix_keypad_platform_data {
  60         const struct matrix_keymap_data *keymap_data;
  61
  62         const unsigned int *row_gpios;
  63         const unsigned int *col_gpios;
  64
  65         unsigned int    num_row_gpios;
  66         unsigned int    num_col_gpios;
  67
  68         unsigned int    col_scan_delay_us;
  69
  70         /* key debounce interval in milli-second */
  71         unsigned int    debounce_ms;
  72
  73         unsigned int    clustered_irq;
  74         unsigned int    clustered_irq_flags;
  75
  76         bool            active_low;
  77         bool            wakeup;
  78         bool            no_autorepeat;
  79         bool            drive_inactive_cols;
  80 };
  81
  82 int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
  83                                const char *keymap_name,
  84                                unsigned int rows, unsigned int cols,
  85                                unsigned short *keymap,
  86                                struct input_dev *input_dev);
  87 int matrix_keypad_parse_properties(struct device *dev,
  88                                    unsigned int *rows, unsigned int *cols);
  89
  90 #define matrix_keypad_parse_of_params matrix_keypad_parse_properties
  91
  92 #endif /* _MATRIX_KEYPAD_H */