| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright 2014 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef __SRC_INCLUDE_GPIOLIB_H__ |
| #define __SRC_INCLUDE_GPIOLIB_H__ |
| |
| /* A generic type, use accessor macros to actually access the hardware. */ |
| typedef unsigned gpio_t; |
| |
| /* |
| * Read the value presented by the set of GPIOs, when each pin is interpreted |
| * as a number in 0..2 range depending on the external pullup situation. |
| * |
| * Depending on the third parameter, the return value is either a set of two |
| * bit fields, each representing one GPIO value, or a number where each GPIO is |
| * included multiplied by 3^gpio_num, resulting in a true tertiary value. |
| * |
| * gpio[]: pin positions to read. little-endian (less significant value first). |
| * num_gpio: number of pins to read. |
| * tertiary: 1: pins are interpreted as a quad coded tertiary. |
| * 0: pins are interpreted as a set of two bit fields. |
| */ |
| int gpio_get_in_tristate_values(gpio_t gpio[], int num_gpio, int tertiary); |
| |
| /* |
| * The following functions are not provided by the common library, but must be |
| * implemented by the appropriate SOC/board instead. |
| */ |
| int gpio_get_in_value(gpio_t gpio); |
| void gpio_set_out_value(gpio_t gpio, int value); |
| void gpio_input_pulldown(gpio_t gpio); |
| void gpio_input_pullup(gpio_t gpio); |
| void gpio_input(gpio_t gpio); |
| |
| #endif |