linux-stable/include/linux/w1-gpio.h
Evgeny Boger 3089a4c8d3 drivers/w1/masters/w1-gpio.c: add strong pullup emulation
Strong pullup is emulated by driving pin logic high after write command
when using tri-state push-pull GPIO.

Signed-off-by: Evgeny Boger <boger@contactless.ru>
Cc: Greg KH <greg@kroah.com>
Acked-by: David Fries <david@fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-23 16:37:04 -08:00

26 lines
729 B
C

/*
* w1-gpio interface to platform code
*
* Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*/
#ifndef _LINUX_W1_GPIO_H
#define _LINUX_W1_GPIO_H
/**
* struct w1_gpio_platform_data - Platform-dependent data for w1-gpio
* @pin: GPIO pin to use
* @is_open_drain: GPIO pin is configured as open drain
*/
struct w1_gpio_platform_data {
unsigned int pin;
unsigned int is_open_drain:1;
void (*enable_external_pullup)(int enable);
unsigned int ext_pullup_enable_pin;
unsigned int pullup_duration;
};
#endif /* _LINUX_W1_GPIO_H */