| 1 | |
| 2 | * Helpers for matrix keyboard bindings
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| 3 | *
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| 4 | * Copyright (C) 2012 Google, Inc
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| 5 | *
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| 6 | * Author:
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| 7 | * Olof Johansson <[email protected]>
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| 8 | *
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| 9 | * This software is licensed under the terms of the GNU General Public
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| 10 | * License version 2, as published by the Free Software Foundation, and
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| 11 | * may be copied, distributed, and modified under those terms.
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| 12 | *
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| 13 | * This program is distributed in the hope that it will be useful,
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | * GNU General Public License for more details.
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| 17 | *
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| 18 |
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| 19 |
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| 20 | #include <linux/device.h>
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| 21 | #include <linux/kernel.h>
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| 22 | #include <linux/types.h>
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| 23 | #include <linux/input.h>
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| 24 | #include <linux/of.h>
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| 25 | #include <linux/export.h>
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| 26 | #include <linux/module.h>
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| 27 | #include <linux/input/matrix_keypad.h>
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| 28 |
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| 29 | static bool matrix_keypad_map_key(struct input_dev *input_dev,
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| 30 | unsigned int rows, unsigned int cols,
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| 31 | unsigned int row_shift, unsigned int key)
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| 32 | {
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| 33 | unsigned short *keymap = input_dev->keycode;
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| 34 | unsigned int row = KEY_ROW(key);
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| 35 | unsigned int col = KEY_COL(key);
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| 36 | unsigned short code = KEY_VAL(key);
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| 37 |
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| 38 | if (row >= rows || col >= cols) {
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| 39 | dev_err(input_dev->dev.parent,
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| 40 | "%s: invalid keymap entry 0x%x (row: %d, col: %d, rows: %d, cols: %d)\n",
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| 41 | __func__, key, row, col, rows, cols);
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| 42 | return false;
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| 43 | }
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| 44 |
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| 45 | keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code;
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| 46 | __set_bit(code, input_dev->keybit);
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| 47 |
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| 48 | return true;
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| 49 | }
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| 50 |
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| 51 | #ifdef CONFIG_OF
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| 52 | static int matrix_keypad_parse_of_keymap(const char *propname,
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| 53 | unsigned int rows, unsigned int cols,
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| 54 | struct input_dev *input_dev)
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| 55 | {
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| 56 | struct device *dev = input_dev->dev.parent;
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| 57 | struct device_node *np = dev->of_node;
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| 58 | unsigned int row_shift = get_count_order(cols);
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| 59 | unsigned int max_keys = rows << row_shift;
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| 60 | unsigned int proplen, i, size;
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| 61 | const __be32 *prop;
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| 62 |
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| 63 | if (!np)
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| 64 | return -ENOENT;
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| 65 |
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| 66 | if (!propname)
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| 67 | propname = "linux,keymap";
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| 68 |
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| 69 | prop = of_get_property(np, propname, &proplen);
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| 70 | if (!prop) {
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| 71 | dev_err(dev, "OF: %s property not defined in %s\n",
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| 72 | propname, np->full_name);
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| 73 | return -ENOENT;
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| 74 | }
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| 75 |
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| 76 | if (proplen % sizeof(u32)) {
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| 77 | dev_err(dev, "OF: Malformed keycode property %s in %s\n",
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| 78 | propname, np->full_name);
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| 79 | return -EINVAL;
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| 80 | }
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| 81 |
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| 82 | size = proplen / sizeof(u32);
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| 83 | if (size > max_keys) {
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| 84 | dev_err(dev, "OF: %s size overflow\n", propname);
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| 85 | return -EINVAL;
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| 86 | }
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| 87 |
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| 88 | for (i = 0; i < size; i++) {
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| 89 | unsigned int key = be32_to_cpup(prop + i);
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| 90 |
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| 91 | if (!matrix_keypad_map_key(input_dev, rows, cols,
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| 92 | row_shift, key))
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| 93 | return -EINVAL;
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| 94 | }
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| 95 |
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| 96 | return 0;
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| 97 | }
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| 98 | #else
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| 99 | static int matrix_keypad_parse_of_keymap(const char *propname,
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| 100 | unsigned int rows, unsigned int cols,
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| 101 | struct input_dev *input_dev)
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| 102 | {
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| 103 | return -ENOSYS;
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| 104 | }
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| 105 | #endif
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| 106 |
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| 107 | |
| 108 | * matrix_keypad_build_keymap - convert platform keymap into matrix keymap
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| 109 | * @keymap_data: keymap supplied by the platform code
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| 110 | * @keymap_name: name of device tree property containing keymap (if device
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| 111 | * tree support is enabled).
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| 112 | * @rows: number of rows in target keymap array
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| 113 | * @cols: number of cols in target keymap array
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| 114 | * @keymap: expanded version of keymap that is suitable for use by
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| 115 | * matrix keyboard driver
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| 116 | * @input_dev: input devices for which we are setting up the keymap
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| 117 | *
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| 118 | * This function converts platform keymap (encoded with KEY() macro) into
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| 119 | * an array of keycodes that is suitable for using in a standard matrix
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| 120 | * keyboard driver that uses row and col as indices.
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| 121 | *
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| 122 | * If @keymap_data is not supplied and device tree support is enabled
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| 123 | * it will attempt load the keymap from property specified by @keymap_name
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| 124 | * argument (or "linux,keymap" if @keymap_name is %NULL).
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| 125 | *
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| 126 | * Callers are expected to set up input_dev->dev.parent before calling this
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| 127 | * function.
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| 128 |
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| 129 | int matrix_keypad_build_keymap(const struct matrix_keymap_data *keymap_data,
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| 130 | const char *keymap_name,
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| 131 | unsigned int rows, unsigned int cols,
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| 132 | unsigned short *keymap,
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| 133 | struct input_dev *input_dev)
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| 134 | {
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| 135 | unsigned int row_shift = get_count_order(cols);
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| 136 | int i;
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| 137 | int error;
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| 138 |
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| 139 | input_dev->keycode = keymap;
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| 140 | input_dev->keycodesize = sizeof(*keymap);
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| 141 | input_dev->keycodemax = rows << row_shift;
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| 142 |
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| 143 | __set_bit(EV_KEY, input_dev->evbit);
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| 144 |
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| 145 | if (keymap_data) {
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| 146 | for (i = 0; i < keymap_data->keymap_size; i++) {
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| 147 | unsigned int key = keymap_data->keymap[i];
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| 148 |
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| 149 | if (!matrix_keypad_map_key(input_dev, rows, cols,
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| 150 | row_shift, key))
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| 151 | return -EINVAL;
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| 152 | }
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| 153 | } else {
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| 154 | error = matrix_keypad_parse_of_keymap(keymap_name, rows, cols,
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| 155 | input_dev);
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| 156 | if (error)
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| 157 | return error;
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| 158 | }
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| 159 |
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| 160 | __clear_bit(KEY_RESERVED, input_dev->keybit);
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| 161 |
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| 162 | return 0;
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| 163 | }
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| 164 | EXPORT_SYMBOL(matrix_keypad_build_keymap);
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| 165 |
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| 166 | MODULE_LICENSE("GPL");
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