diff options
| -rw-r--r-- | include/asm-generic/gpio.h | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h index a1ebb28..c19e16c 100644 --- a/include/asm-generic/gpio.h +++ b/include/asm-generic/gpio.h @@ -1,5 +1,6 @@ /* * Copyright (c) 2011 The Chromium OS Authors. + * Copyright (c) 2011, NVIDIA Corp. All rights reserved. * See file CREDITS for list of people who contributed to this * project. * @@ -19,6 +20,9 @@ * MA 02111-1307 USA */ +#ifndef _ASM_GENERIC_GPIO_H_ +#define _ASM_GENERIC_GPIO_H_ + /* * Generic GPIO API for U-Boot * @@ -38,37 +42,56 @@ */ /** + * Request ownership of a GPIO. + * + * @param gpio GPIO number + * @param label Name given to the GPIO + * @return 0 if ok, -1 on error + */ +int gpio_request(unsigned gpio, const char *label); + +/** + * Stop using the GPIO. This function should not alter pin configuration. + * + * @param gpio GPIO number + * @return 0 if ok, -1 on error + */ +int gpio_free(unsigned gpio); + +/** * Make a GPIO an input. * - * @param gp GPIO number + * @param gpio GPIO number * @return 0 if ok, -1 on error */ -int gpio_direction_input(int gp); +int gpio_direction_input(unsigned gpio); /** * Make a GPIO an output, and set its value. * - * @param gp GPIO number + * @param gpio GPIO number * @param value GPIO value (0 for low or 1 for high) * @return 0 if ok, -1 on error */ -int gpio_direction_output(int gp, int value); +int gpio_direction_output(unsigned gpio, int value); /** * Get a GPIO's value. This will work whether the GPIO is an input * or an output. * - * @param gp GPIO number + * @param gpio GPIO number * @return 0 if low, 1 if high, -1 on error */ -int gpio_get_value(int gp); +int gpio_get_value(unsigned gpio); /** - * Set an output GPIO's value. The GPIO must already be an output of + * Set an output GPIO's value. The GPIO must already be an output or * this function may have no effect. * - * @param gp GPIO number + * @param gpio GPIO number * @param value GPIO value (0 for low or 1 for high) * @return 0 if ok, -1 on error */ -int gpio_set_value(int gp, int value); +int gpio_set_value(unsigned gpio, int value); + +#endif /* _ASM_GENERIC_GPIO_H_ */ |