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  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #ifndef __ASM_SANDBOX_GPIO_H
  10 #define __ASM_SANDBOX_GPIO_H
  11
  12 /*
  13  * We use the generic interface, and add a back-channel.
  14  *
  15  * The back-channel functions are declared in this file. They should not be used
  16  * except in test code.
  17  *
  18  * Test code can, for example, call sandbox_gpio_set_value() to set the value of
  19  * a simulated GPIO. From then on, normal code in U-Boot will see this new
  20  * value when it calls gpio_get_value().
  21  *
  22  * NOTE: DO NOT use the functions in this file except in test code!
  23  */
  24 #include <asm-generic/gpio.h>
  25
  26 /**
  27  * Return the simulated value of a GPIO (used only in sandbox test code)
  28  *
  29  * @param gp    GPIO number
  30  * @return -1 on error, 0 if GPIO is low, >0 if high
  31  */
  32 int sandbox_gpio_get_value(unsigned gp);
  33
  34 /**
  35  * Set the simulated value of a GPIO (used only in sandbox test code)
  36  *
  37  * @param gp    GPIO number
  38  * @param value value to set (0 for low, non-zero for high)
  39  * @return -1 on error, 0 if ok
  40  */
  41 int sandbox_gpio_set_value(unsigned gp, int value);
  42
  43 /**
  44  * Return the simulated direction of a GPIO (used only in sandbox test code)
  45  *
  46  * @param gp    GPIO number
  47  * @return -1 on error, 0 if GPIO is input, >0 if output
  48  */
  49 int sandbox_gpio_get_direction(unsigned gp);
  50
  51 /**
  52  * Set the simulated direction of a GPIO (used only in sandbox test code)
  53  *
  54  * @param gp    GPIO number
  55  * @param output 0 to set as input, 1 to set as output
  56  * @return -1 on error, 0 if ok
  57  */
  58 int sandbox_gpio_set_direction(unsigned gp, int output);
  59
  60 /* Display information about each GPIO */
  61 void gpio_info(void);
  62
  63 #define gpio_status()   gpio_info()
  64
  65 #endif