Commit | Line | Data |
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2cd36877 | 1 | /* |
1932811f | 2 | * Helpers for matrix keyboard bindings |
2cd36877 OJ |
3 | * |
4 | * Copyright (C) 2012 Google, Inc | |
5 | * | |
6 | * Author: | |
7 | * Olof Johansson <olof@lixom.net> | |
8 | * | |
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. | |
12 | * | |
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. | |
17 | * | |
18 | */ | |
19 | ||
b45c8f35 | 20 | #include <linux/device.h> |
2cd36877 OJ |
21 | #include <linux/kernel.h> |
22 | #include <linux/types.h> | |
23 | #include <linux/input.h> | |
24 | #include <linux/of.h> | |
2cd36877 | 25 | #include <linux/export.h> |
1932811f DT |
26 | #include <linux/input/matrix_keypad.h> |
27 | ||
b45c8f35 DT |
28 | static bool matrix_keypad_map_key(struct input_dev *input_dev, |
29 | unsigned int rows, unsigned int cols, | |
30 | unsigned int row_shift, unsigned int key) | |
31 | { | |
32 | unsigned char *keymap = input_dev->keycode; | |
33 | unsigned int row = KEY_ROW(key); | |
34 | unsigned int col = KEY_COL(key); | |
35 | unsigned short code = KEY_VAL(key); | |
36 | ||
37 | if (row >= rows || col >= cols) { | |
38 | dev_err(input_dev->dev.parent, | |
39 | "%s: invalid keymap entry 0x%x (row: %d, col: %d, rows: %d, cols: %d)\n", | |
40 | __func__, key, row, col, rows, cols); | |
41 | return false; | |
42 | } | |
43 | ||
44 | keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code; | |
45 | __set_bit(code, input_dev->keybit); | |
46 | ||
47 | return true; | |
48 | } | |
49 | ||
50 | #ifdef CONFIG_OF | |
51 | static int matrix_keypad_parse_of_keymap(const char *propname, | |
52 | unsigned int rows, unsigned int cols, | |
53 | struct input_dev *input_dev) | |
54 | { | |
55 | struct device *dev = input_dev->dev.parent; | |
56 | struct device_node *np = dev->of_node; | |
57 | unsigned int row_shift = get_count_order(cols); | |
58 | unsigned int max_keys = rows << row_shift; | |
59 | unsigned int proplen, i, size; | |
60 | const __be32 *prop; | |
61 | ||
62 | if (!np) | |
63 | return -ENOENT; | |
64 | ||
65 | if (!propname) | |
66 | propname = "linux,keymap"; | |
67 | ||
68 | prop = of_get_property(np, propname, &proplen); | |
69 | if (!prop) { | |
70 | dev_err(dev, "OF: %s property not defined in %s\n", | |
71 | propname, np->full_name); | |
72 | return -ENOENT; | |
73 | } | |
74 | ||
75 | if (proplen % sizeof(u32)) { | |
76 | dev_err(dev, "OF: Malformed keycode property %s in %s\n", | |
77 | propname, np->full_name); | |
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | size = proplen / sizeof(u32); | |
82 | if (size > max_keys) { | |
83 | dev_err(dev, "OF: %s size overflow\n", propname); | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | for (i = 0; i < size; i++) { | |
88 | unsigned int key = be32_to_cpup(prop + i); | |
89 | ||
90 | if (!matrix_keypad_map_key(input_dev, rows, cols, | |
91 | row_shift, key)) | |
92 | return -EINVAL; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | } | |
97 | #else | |
98 | static int matrix_keypad_parse_of_keymap(const char *propname, | |
99 | unsigned int rows, unsigned int cols, | |
100 | struct input_dev *input_dev) | |
101 | { | |
102 | return -ENOSYS; | |
103 | } | |
104 | #endif | |
1932811f DT |
105 | |
106 | /** | |
107 | * matrix_keypad_build_keymap - convert platform keymap into matrix keymap | |
108 | * @keymap_data: keymap supplied by the platform code | |
109 | * @keymap_name: name of device tree property containing keymap (if device | |
110 | * tree support is enabled). | |
111 | * @rows: number of rows in target keymap array | |
112 | * @cols: number of cols in target keymap array | |
113 | * @keymap: expanded version of keymap that is suitable for use by | |
114 | * matrix keyboard driver | |
115 | * @input_dev: input devices for which we are setting up the keymap | |
116 | * | |
117 | * This function converts platform keymap (encoded with KEY() macro) into | |
118 | * an array of keycodes that is suitable for using in a standard matrix | |
119 | * keyboard driver that uses row and col as indices. | |
b45c8f35 DT |
120 | * |
121 | * If @keymap_data is not supplied and device tree support is enabled | |
122 | * it will attempt load the keymap from property specified by @keymap_name | |
123 | * argument (or "linux,keymap" if @keymap_name is %NULL). | |
124 | * | |
125 | * Callers are expected to set up input_dev->dev.parent before calling this | |
126 | * function. | |
1932811f DT |
127 | */ |
128 | int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data, | |
129 | const char *keymap_name, | |
130 | unsigned int rows, unsigned int cols, | |
131 | unsigned short *keymap, | |
132 | struct input_dev *input_dev) | |
133 | { | |
134 | unsigned int row_shift = get_count_order(cols); | |
135 | int i; | |
b45c8f35 | 136 | int error; |
1932811f DT |
137 | |
138 | input_dev->keycode = keymap; | |
139 | input_dev->keycodesize = sizeof(*keymap); | |
140 | input_dev->keycodemax = rows << row_shift; | |
141 | ||
142 | __set_bit(EV_KEY, input_dev->evbit); | |
143 | ||
b45c8f35 DT |
144 | if (keymap_data) { |
145 | for (i = 0; i < keymap_data->keymap_size; i++) { | |
146 | unsigned int key = keymap_data->keymap[i]; | |
1932811f | 147 | |
b45c8f35 DT |
148 | if (!matrix_keypad_map_key(input_dev, rows, cols, |
149 | row_shift, key)) | |
150 | return -EINVAL; | |
1932811f | 151 | } |
b45c8f35 DT |
152 | } else { |
153 | error = matrix_keypad_parse_of_keymap(keymap_name, rows, cols, | |
154 | input_dev); | |
155 | if (error) | |
156 | return error; | |
1932811f | 157 | } |
b45c8f35 | 158 | |
1932811f DT |
159 | __clear_bit(KEY_RESERVED, input_dev->keybit); |
160 | ||
161 | return 0; | |
162 | } | |
163 | EXPORT_SYMBOL(matrix_keypad_build_keymap); |