2 * Helpers for matrix keyboard bindings
4 * Copyright (C) 2012 Google, Inc
7 * Olof Johansson <olof@lixom.net>
9 * This software is licensed under the terms of the GNU General Public
10 * License version 2, as published by the Free Software Foundation, and
11 * may be copied, distributed, and modified under those terms.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/input.h>
24 #include <linux/export.h>
25 #include <linux/gfp.h>
26 #include <linux/slab.h>
27 #include <linux/input/matrix_keypad.h>
31 * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
32 * @keymap_data: keymap supplied by the platform code
33 * @keymap_name: name of device tree property containing keymap (if device
34 * tree support is enabled).
35 * @rows: number of rows in target keymap array
36 * @cols: number of cols in target keymap array
37 * @keymap: expanded version of keymap that is suitable for use by
38 * matrix keyboard driver
39 * @input_dev: input devices for which we are setting up the keymap
41 * This function converts platform keymap (encoded with KEY() macro) into
42 * an array of keycodes that is suitable for using in a standard matrix
43 * keyboard driver that uses row and col as indices.
45 int matrix_keypad_build_keymap(const struct matrix_keymap_data
*keymap_data
,
46 const char *keymap_name
,
47 unsigned int rows
, unsigned int cols
,
48 unsigned short *keymap
,
49 struct input_dev
*input_dev
)
51 unsigned int row_shift
= get_count_order(cols
);
54 input_dev
->keycode
= keymap
;
55 input_dev
->keycodesize
= sizeof(*keymap
);
56 input_dev
->keycodemax
= rows
<< row_shift
;
58 __set_bit(EV_KEY
, input_dev
->evbit
);
60 for (i
= 0; i
< keymap_data
->keymap_size
; i
++) {
61 unsigned int key
= keymap_data
->keymap
[i
];
62 unsigned int row
= KEY_ROW(key
);
63 unsigned int col
= KEY_COL(key
);
64 unsigned short code
= KEY_VAL(key
);
66 if (row
>= rows
|| col
>= cols
) {
67 dev_err(input_dev
->dev
.parent
,
68 "%s: invalid keymap entry %d (row: %d, col: %d, rows: %d, cols: %d)\n",
69 __func__
, i
, row
, col
, rows
, cols
);
73 keymap
[MATRIX_SCAN_CODE(row
, col
, row_shift
)] = code
;
74 __set_bit(code
, input_dev
->keybit
);
76 __clear_bit(KEY_RESERVED
, input_dev
->keybit
);
80 EXPORT_SYMBOL(matrix_keypad_build_keymap
);
83 struct matrix_keymap_data
*
84 matrix_keyboard_of_fill_keymap(struct device_node
*np
,
87 struct matrix_keymap_data
*kd
;
96 propname
= "linux,keymap";
98 prop
= of_get_property(np
, propname
, &proplen
);
102 if (proplen
% sizeof(u32
)) {
103 pr_warn("Malformed keymap property %s in %s\n",
104 propname
, np
->full_name
);
108 kd
= kzalloc(sizeof(*kd
), GFP_KERNEL
);
112 kd
->keymap
= keymap
= kzalloc(proplen
, GFP_KERNEL
);
118 kd
->keymap_size
= proplen
/ sizeof(u32
);
120 for (i
= 0; i
< kd
->keymap_size
; i
++) {
121 u32 tmp
= be32_to_cpup(prop
+ i
);
122 int key_code
, row
, col
;
124 row
= (tmp
>> 24) & 0xff;
125 col
= (tmp
>> 16) & 0xff;
126 key_code
= tmp
& 0xffff;
127 keymap
[i
] = KEY(row
, col
, key_code
);
132 EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap
);
134 void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data
*kd
)
141 EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap
);