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add more explicit GPIO types

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This patch adds explicit handling of open-drain outputs
and adds Hi-Z for high-impedence state (floating) outputs.

Signed-off-by: David Hendricks <dhendrix@chromium.org>

BUG=none
TEST=compile tested

Change-Id: I1a0c2e8366f6a82cd9cd7e83e57122944f2bdc2d
This commit is contained in:
David Hendricks
2012-04-11 14:04:08 -07:00
parent 9fa4246a8d
commit 28292ae663
1 changed files with 5 additions and 0 deletions
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5
include/gpio.h
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@@ -13,21 +13,26 @@
/* Flag definitions for gpio_info. */
#define GPIO_INPUT 0x0000 /* Input */
#define GPIO_OUTPUT 0x0001 /* Output */
#define GPIO_PULL 0x0002 /* Input with on-chip pullup/pulldown */
#define GPIO_HIGH 0x0004 /* If GPIO_OUTPUT, default high; if GPIO_PULL,
* pull up (otherwise default low / pull
* down) */
#define GPIO_OPEN_DRAIN 0x0008 /* Output type is open-drain */
#define GPIO_INT_RISING 0x0010 /* Interrupt on rising edge */
#define GPIO_INT_FALLING 0x0020 /* Interrupt on falling edge */
#define GPIO_INT_BOTH 0x0040 /* Interrupt on both edges */
#define GPIO_INT_LOW 0x0080 /* Interrupt on low level */
#define GPIO_INT_HIGH 0x0100 /* Interrupt on high level */
/* Common flag combinations */
#define GPIO_OUT_LOW GPIO_OUTPUT
#define GPIO_OUT_HIGH (GPIO_OUTPUT | GPIO_HIGH)
#define GPIO_PULL_DOWN GPIO_PULL
#define GPIO_PULL_UP (GPIO_PULL | GPIO_HIGH)
#define GPIO_HI_Z (GPIO_OUTPUT | GPIO_OPEN_DRAIN | GPIO_HIGH)
#define GPIO_INT_EDGE (GPIO_INT_RISING | GPIO_INT_FALLING | GPIO_INT_BOTH)
#define GPIO_INT_LEVEL (GPIO_INT_LOW | GPIO_INT_HIGH)
#define GPIO_INT_ANY (GPIO_INT_EDGE | GPIO_INT_LEVEL)