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(struct udevice *dev, unsigned int offset); 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(struct udevice *dev, unsigned int offset, int value); 42 43 /** 44 * Set or reset the simulated open drain mode of a GPIO (used only in sandbox 45 * test code) 46 * 47 * @param gp GPIO number 48 * @param value value to set (0 for enabled open drain mode, non-zero for 49 * disabled) 50 * @return -1 on error, 0 if ok 51 */ 52 int sandbox_gpio_set_open_drain(struct udevice *dev, unsigned offset, int value); 53 54 /** 55 * Return the state of the simulated open drain mode of a GPIO (used only in 56 * sandbox test code) 57 * 58 * @param gp GPIO number 59 * @return -1 on error, 0 if GPIO is input, >0 if output 60 */ 61 int sandbox_gpio_get_open_drain(struct udevice *dev, unsigned offset); 62 63 /** 64 * Return the simulated direction of a GPIO (used only in sandbox test code) 65 * 66 * @param gp GPIO number 67 * @return -1 on error, 0 if GPIO is input, >0 if output 68 */ 69 int sandbox_gpio_get_direction(struct udevice *dev, unsigned int offset); 70 71 /** 72 * Set the simulated direction of a GPIO (used only in sandbox test code) 73 * 74 * @param gp GPIO number 75 * @param output 0 to set as input, 1 to set as output 76 * @return -1 on error, 0 if ok 77 */ 78 int sandbox_gpio_set_direction(struct udevice *dev, unsigned int offset, 79 int output); 80 81 #endif 82