Dmitry Torokhov | 1932811 | 2012-05-10 22:37:08 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Helpers for matrix keyboard bindings |
| 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 | |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/input.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/export.h> |
| 25 | #include <linux/gfp.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/input/matrix_keypad.h> |
| 28 | |
| 29 | |
| 30 | /** |
| 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 |
| 40 | * |
| 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. |
| 44 | */ |
| 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) |
| 50 | { |
| 51 | unsigned int row_shift = get_count_order(cols); |
| 52 | int i; |
| 53 | |
| 54 | input_dev->keycode = keymap; |
| 55 | input_dev->keycodesize = sizeof(*keymap); |
| 56 | input_dev->keycodemax = rows << row_shift; |
| 57 | |
| 58 | __set_bit(EV_KEY, input_dev->evbit); |
| 59 | |
| 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); |
| 65 | |
| 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); |
| 70 | return -EINVAL; |
| 71 | } |
| 72 | |
| 73 | keymap[MATRIX_SCAN_CODE(row, col, row_shift)] = code; |
| 74 | __set_bit(code, input_dev->keybit); |
| 75 | } |
| 76 | __clear_bit(KEY_RESERVED, input_dev->keybit); |
| 77 | |
| 78 | return 0; |
| 79 | } |
| 80 | EXPORT_SYMBOL(matrix_keypad_build_keymap); |
| 81 | |
| 82 | #ifdef CONFIG_OF |
| 83 | struct matrix_keymap_data * |
| 84 | matrix_keyboard_of_fill_keymap(struct device_node *np, |
| 85 | const char *propname) |
| 86 | { |
| 87 | struct matrix_keymap_data *kd; |
| 88 | u32 *keymap; |
| 89 | int proplen, i; |
| 90 | const __be32 *prop; |
| 91 | |
| 92 | if (!np) |
| 93 | return NULL; |
| 94 | |
| 95 | if (!propname) |
| 96 | propname = "linux,keymap"; |
| 97 | |
| 98 | prop = of_get_property(np, propname, &proplen); |
| 99 | if (!prop) |
| 100 | return NULL; |
| 101 | |
| 102 | if (proplen % sizeof(u32)) { |
| 103 | pr_warn("Malformed keymap property %s in %s\n", |
| 104 | propname, np->full_name); |
| 105 | return NULL; |
| 106 | } |
| 107 | |
| 108 | kd = kzalloc(sizeof(*kd), GFP_KERNEL); |
| 109 | if (!kd) |
| 110 | return NULL; |
| 111 | |
| 112 | kd->keymap = keymap = kzalloc(proplen, GFP_KERNEL); |
| 113 | if (!kd->keymap) { |
| 114 | kfree(kd); |
| 115 | return NULL; |
| 116 | } |
| 117 | |
| 118 | kd->keymap_size = proplen / sizeof(u32); |
| 119 | |
| 120 | for (i = 0; i < kd->keymap_size; i++) { |
| 121 | u32 tmp = be32_to_cpup(prop + i); |
| 122 | int key_code, row, col; |
| 123 | |
| 124 | row = (tmp >> 24) & 0xff; |
| 125 | col = (tmp >> 16) & 0xff; |
| 126 | key_code = tmp & 0xffff; |
| 127 | keymap[i] = KEY(row, col, key_code); |
| 128 | } |
| 129 | |
| 130 | return kd; |
| 131 | } |
| 132 | EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap); |
| 133 | |
| 134 | void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd) |
| 135 | { |
| 136 | if (kd) { |
| 137 | kfree(kd->keymap); |
| 138 | kfree(kd); |
| 139 | } |
| 140 | } |
| 141 | EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap); |
| 142 | #endif |