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 */