projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2cd36877 OJ |
1 | /* |
| 2 | * Helpers for open firmware matrix keyboard bindings | |
| 3 | * | |
| 4 | * Copyright (C) 2012 Google, Inc | |
| 5 | * | |
| 6 | * Author: | |
| 7 | * Olof Johansson <[email protected]> | |
| 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/input/matrix_keypad.h> | |
| 25 | #include <linux/export.h> | |
| 26 | #include <linux/gfp.h> | |
| 27 | #include <linux/slab.h> | |
| 28 | ||
| 29 | struct matrix_keymap_data * | |
| 30 | matrix_keyboard_of_fill_keymap(struct device_node *np, | |
| 31 | const char *propname) | |
| 32 | { | |
| 33 | struct matrix_keymap_data *kd; | |
| 34 | u32 *keymap; | |
| 35 | int proplen, i; | |
| 36 | const __be32 *prop; | |
| 37 | ||
| 38 | if (!np) | |
| 39 | return NULL; | |
| 40 | ||
| 41 | if (!propname) | |
| 42 | propname = "linux,keymap"; | |
| 43 | ||
| 44 | prop = of_get_property(np, propname, &proplen); | |
| 45 | if (!prop) | |
| 46 | return NULL; | |
| 47 | ||
| 48 | if (proplen % sizeof(u32)) { | |
| 49 | pr_warn("Malformed keymap property %s in %s\n", | |
| 50 | propname, np->full_name); | |
| 51 | return NULL; | |
| 52 | } | |
| 53 | ||
| 54 | kd = kzalloc(sizeof(*kd), GFP_KERNEL); | |
| 55 | if (!kd) | |
| 56 | return NULL; | |
| 57 | ||
| 58 | kd->keymap = keymap = kzalloc(proplen, GFP_KERNEL); | |
| 59 | if (!kd->keymap) { | |
| 60 | kfree(kd); | |
| 61 | return NULL; | |
| 62 | } | |
| 63 | ||
| 64 | kd->keymap_size = proplen / sizeof(u32); | |
| 65 | ||
| 66 | for (i = 0; i < kd->keymap_size; i++) { | |
| 67 | u32 tmp = be32_to_cpup(prop + i); | |
| 68 | int key_code, row, col; | |
| 69 | ||
| 70 | row = (tmp >> 24) & 0xff; | |
| 71 | col = (tmp >> 16) & 0xff; | |
| 72 | key_code = tmp & 0xffff; | |
| 73 | keymap[i] = KEY(row, col, key_code); | |
| 74 | } | |
| 75 | ||
| 76 | return kd; | |
| 77 | } | |
| 78 | EXPORT_SYMBOL_GPL(matrix_keyboard_of_fill_keymap); | |
| 79 | ||
| 80 | void matrix_keyboard_of_free_keymap(const struct matrix_keymap_data *kd) | |
| 81 | { | |
| 82 | if (kd) { | |
| 83 | kfree(kd->keymap); | |
| 84 | kfree(kd); | |
| 85 | } | |
| 86 | } | |
| 87 | EXPORT_SYMBOL_GPL(matrix_keyboard_of_free_keymap); |