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 dev device to use
30 * @param offset GPIO offset within bank
31 * @return -1 on error, 0 if GPIO is low, >0 if high
33 int sandbox_gpio_get_value(struct udevice *dev, unsigned int offset);
36 * Set the simulated value of a GPIO (used only in sandbox test code)
38 * @param dev device to use
39 * @param offset GPIO offset within bank
40 * @param value value to set (0 for low, non-zero for high)
41 * @return -1 on error, 0 if ok
43 int sandbox_gpio_set_value(struct udevice *dev, unsigned int offset, int value);
46 * Set or reset the simulated open drain mode of a GPIO (used only in sandbox
49 * @param gp GPIO number
50 * @param value value to set (0 for enabled open drain mode, non-zero for
52 * @return -1 on error, 0 if ok
54 int sandbox_gpio_set_open_drain(struct udevice *dev, unsigned offset, int value);
57 * Return the state of the simulated open drain mode of a GPIO (used only in
60 * @param gp GPIO number
61 * @return -1 on error, 0 if GPIO is input, >0 if output
63 int sandbox_gpio_get_open_drain(struct udevice *dev, unsigned offset);
66 * Return the simulated direction of a GPIO (used only in sandbox test code)
68 * @param dev device to use
69 * @param offset GPIO offset within bank
70 * @return -1 on error, 0 if GPIO is input, >0 if output
72 int sandbox_gpio_get_direction(struct udevice *dev, unsigned int offset);
75 * Set the simulated direction of a GPIO (used only in sandbox test code)
77 * @param dev device to use
78 * @param offset GPIO offset within bank
79 * @param output 0 to set as input, 1 to set as output
80 * @return -1 on error, 0 if ok
82 int sandbox_gpio_set_direction(struct udevice *dev, unsigned int offset,