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1#ifndef _MATRIX_KEYPAD_H
2#define _MATRIX_KEYPAD_H
3
4#include <linux/types.h>
5#include <linux/input.h>
6
7#define MATRIX_MAX_ROWS 16
8#define MATRIX_MAX_COLS 16
9
10#define KEY(row, col, val) ((((row) & (MATRIX_MAX_ROWS - 1)) << 24) |\
11 (((col) & (MATRIX_MAX_COLS - 1)) << 16) |\
12 (val & 0xffff))
13
14#define KEY_ROW(k) (((k) >> 24) & 0xff)
15#define KEY_COL(k) (((k) >> 16) & 0xff)
16#define KEY_VAL(k) ((k) & 0xffff)
17
18#define MATRIX_SCAN_CODE(row, col, row_shift) (((row) << (row_shift)) + (col))
19
20/**
21 * struct matrix_keymap_data - keymap for matrix keyboards
22 * @keymap: pointer to array of uint32 values encoded with KEY() macro
23 * representing keymap
24 * @keymap_size: number of entries (initialized) in this keymap
25 *
26 * This structure is supposed to be used by platform code to supply
27 * keymaps to drivers that implement matrix-like keypads/keyboards.
28 */
29struct matrix_keymap_data {
30 const uint32_t *keymap;
31 unsigned int keymap_size;
32};
33
34/**
35 * struct matrix_keypad_platform_data - platform-dependent keypad data
36 * @keymap_data: pointer to &matrix_keymap_data
37 * @row_gpios: pointer to array of gpio numbers representing rows
38 * @col_gpios: pointer to array of gpio numbers reporesenting colums
39 * @num_row_gpios: actual number of row gpios used by device
40 * @num_col_gpios: actual number of col gpios used by device
41 * @col_scan_delay_us: delay, measured in microseconds, that is
42 * needed before we can keypad after activating column gpio
43 * @debounce_ms: debounce interval in milliseconds
44 * @active_low: gpio polarity
45 * @wakeup: controls whether the device should be set up as wakeup
46 * source
47 *
48 * This structure represents platform-specific data that use used by
49 * matrix_keypad driver to perform proper initialization.
50 */
51struct matrix_keypad_platform_data {
52 const struct matrix_keymap_data *keymap_data;
53
54 const unsigned int *row_gpios;
55 const unsigned int *col_gpios;
56
57 unsigned int num_row_gpios;
58 unsigned int num_col_gpios;
59
60 unsigned int col_scan_delay_us;
61
62 /* key debounce interval in milli-second */
63 unsigned int debounce_ms;
64
65 bool active_low;
66 bool wakeup;
67};
68
69/**
70 * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
71 * @keymap_data: keymap supplied by the platform code
72 * @row_shift: number of bits to shift row value by to advance to the next
73 * line in the keymap
74 * @keymap: expanded version of keymap that is suitable for use by
75 * matrix keyboad driver
76 * @keybit: pointer to bitmap of keys supported by input device
77 *
78 * This function converts platform keymap (encoded with KEY() macro) into
79 * an array of keycodes that is suitable for using in a standard matrix
80 * keyboard driver that uses row and col as indices.
81 */
82static inline void
83matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
84 unsigned int row_shift,
85 unsigned short *keymap, unsigned long *keybit)
86{
87 int i;
88
89 for (i = 0; i < keymap_data->keymap_size; i++) {
90 unsigned int key = keymap_data->keymap[i];
91 unsigned int row = KEY_ROW(key);
92 unsigned int col = KEY_COL(key);
93 unsigned short code = KEY_VAL(key);
94
95 keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
96 __set_bit(code, keybit);
97 }
98 __clear_bit(KEY_RESERVED, keybit);
99}
100
101#endif /* _MATRIX_KEYPAD_H */