include/linux/input/matrix_keypad.h

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