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 /**
79 * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
80 * @keymap_data: keymap supplied by the platform code
81 * @row_shift: number of bits to shift row value by to advance to the next
82 * line in the keymap
83 * @keymap: expanded version of keymap that is suitable for use by
84 * matrix keyboad driver
85 * @keybit: pointer to bitmap of keys supported by input device
86 *
87 * This function converts platform keymap (encoded with KEY() macro) into
88 * an array of keycodes that is suitable for using in a standard matrix
89 * keyboard driver that uses row and col as indices.
90 */
91 static inline void
matrix_keypad_build_keymap(const struct matrix_keymap_data * keymap_data,unsigned int row_shift,unsigned short * keymap,unsigned long * keybit)92 matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
93 unsigned int row_shift,
94 unsigned short *keymap, unsigned long *keybit)
95 {
96 int i;
97
98 for (i = 0; i < keymap_data->keymap_size; i++) {
99 unsigned int key = keymap_data->keymap[i];
100 unsigned int row = KEY_ROW(key);
101 unsigned int col = KEY_COL(key);
102 unsigned short code = KEY_VAL(key);
103
104 keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
105 __set_bit(code, keybit);
106 }
107 __clear_bit(KEY_RESERVED, keybit);
108 }
109
110 #ifdef CONFIG_INPUT_OF_MATRIX_KEYMAP
111 struct matrix_keymap_data *
112 matrix_keyboard_of_fill_keymap(struct device_node *np, const char *propname);
113
114 void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd);
115 #else
116 static inline struct matrix_keymap_data *
matrix_keyboard_of_fill_keymap(struct device_node * np,const char * propname)117 matrix_keyboard_of_fill_keymap(struct device_node *np, const char *propname)
118 {
119 return NULL;
120 }
121
122 static inline void
matrix_keyboard_of_free_keymap(const struct matrix_keymap_data * kd)123 matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd)
124 {
125 }
126 #endif
127
128 #endif /* _MATRIX_KEYPAD_H */
129