LXR uboot/arch/sandbox/include/asm/gpio.h

   1/*
   2 * This is the interface to the sandbox GPIO driver for test code which
   3 * wants to change the GPIO values reported to U-Boot.
   4 *
   5 * Copyright (c) 2011 The Chromium OS Authors.
   6 * See file CREDITS for list of people who contributed to this
   7 * project.
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public License as
  11 * published by the Free Software Foundation; either version 2 of
  12 * the License, or (at your option) any later version.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22 * MA 02111-1307 USA
  23 */
  24
  25#ifndef __ASM_SANDBOX_GPIO_H
  26#define __ASM_SANDBOX_GPIO_H
  27
  28/*
  29 * We use the generic interface, and add a back-channel.
  30 *
  31 * The back-channel functions are declared in this file. They should not be used
  32 * except in test code.
  33 *
  34 * Test code can, for example, call sandbox_gpio_set_value() to set the value of
  35 * a simulated GPIO. From then on, normal code in U-Boot will see this new
  36 * value when it calls gpio_get_value().
  37 *
  38 * NOTE: DO NOT use the functions in this file except in test code!
  39 */
  40#include <asm-generic/gpio.h>
  41
  42/**
  43 * Return the simulated value of a GPIO (used only in sandbox test code)
  44 *
  45 * @param gp    GPIO number
  46 * @return -1 on error, 0 if GPIO is low, >0 if high
  47 */
  48int sandbox_gpio_get_value(unsigned gp);
  49
  50/**
  51 * Set the simulated value of a GPIO (used only in sandbox test code)
  52 *
  53 * @param gp    GPIO number
  54 * @param value value to set (0 for low, non-zero for high)
  55 * @return -1 on error, 0 if ok
  56 */
  57int sandbox_gpio_set_value(unsigned gp, int value);
  58
  59/**
  60 * Return the simulated direction of a GPIO (used only in sandbox test code)
  61 *
  62 * @param gp    GPIO number
  63 * @return -1 on error, 0 if GPIO is input, >0 if output
  64 */
  65int sandbox_gpio_get_direction(unsigned gp);
  66
  67/**
  68 * Set the simulated direction of a GPIO (used only in sandbox test code)
  69 *
  70 * @param gp    GPIO number
  71 * @param output 0 to set as input, 1 to set as output
  72 * @return -1 on error, 0 if ok
  73 */
  74int sandbox_gpio_set_direction(unsigned gp, int output);
  75
  76/* Display information about each GPIO */
  77void gpio_info(void);
  78
  79#define gpio_status()   gpio_info()
  80
  81#endif
  82