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.
5 * Copyright (c) 2011 The Chromium OS Authors.
6 * SPDX-License-Identifier: GPL-2.0+
9 #ifndef __ASM_SANDBOX_GPIO_H
10 #define __ASM_SANDBOX_GPIO_H
13 * We use the generic interface, and add a back-channel.
15 * The back-channel functions are declared in this file. They should not be used
16 * except in test code.
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().
22 * NOTE: DO NOT use the functions in this file except in test code!
24 #include <asm-generic/gpio.h>
27 * Return the simulated value of a GPIO (used only in sandbox test code)
29 * @param gp GPIO number
30 * @return -1 on error, 0 if GPIO is low, >0 if high
32 int sandbox_gpio_get_value(struct device *dev, unsigned int offset);
35 * Set the simulated value of a GPIO (used only in sandbox test code)
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
41 int sandbox_gpio_set_value(struct device *dev, unsigned int offset, int value);
44 * Return the simulated direction of a GPIO (used only in sandbox test code)
46 * @param gp GPIO number
47 * @return -1 on error, 0 if GPIO is input, >0 if output
49 int sandbox_gpio_get_direction(struct device *dev, unsigned int offset);
52 * Set the simulated direction of a GPIO (used only in sandbox test code)
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
58 int sandbox_gpio_set_direction(struct device *dev, unsigned int offset,