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gpio: Modify common gpio.h to more closely match Linux 

Change "int gp" to "unsigned gpio"
Add request and free entry-points

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Joe Hershberger 2011-11-11 15:55:35 -06:00 committed by Kim Phillips
parent 9a420986cc
commit 5f533aeb51
1 changed files with 33 additions and 10 deletions
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43
include/asm-generic/gpio.h
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@ -1,5 +1,6 @@
/* /*
* Copyright (c) 2011 The Chromium OS Authors. * 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 * See file CREDITS for list of people who contributed to this
* project. * project.
* *
@ -19,6 +20,9 @@
* MA 02111-1307 USA * MA 02111-1307 USA
*/ */
#ifndef _ASM_GENERIC_GPIO_H_
#define _ASM_GENERIC_GPIO_H_
/* /*
* Generic GPIO API for U-Boot * Generic GPIO API for U-Boot
* *
@ -38,37 +42,56 @@
*/ */
/** /**
* Make a GPIO an input. * Request ownership of a GPIO.
* *
* @param gp GPIO number * @param gpio GPIO number
* @param label Name given to the GPIO
* @return 0 if ok, -1 on error * @return 0 if ok, -1 on error
*/ */
int gpio_direction_input(int gp); 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 gpio GPIO number
* @return 0 if ok, -1 on error
*/
int gpio_direction_input(unsigned gpio);
/** /**
* Make a GPIO an output, and set its value. * 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) * @param value GPIO value (0 for low or 1 for high)
* @return 0 if ok, -1 on error * @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 * Get a GPIO's value. This will work whether the GPIO is an input
* or an output. * or an output.
* *
* @param gp GPIO number * @param gpio GPIO number
* @return 0 if low, 1 if high, -1 on error * @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. * 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) * @param value GPIO value (0 for low or 1 for high)
* @return 0 if ok, -1 on error * @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_ */