c8a06c1ef0
On embedded devices, sleep mode conditions can be tricky to handle, Especially when processors tend to pull-down the w1 bus during sleep. Bus slaves (such as the ds2760) may interpret this as a reason for power-down conditions and entirely switch off the device. This patch adds a callback function pointer to let users switch on and off the external pull-up resistor. This lets the outside world know whether the processor is currently actively driving the bus or not. When this callback is not provided, the code behaviour won't change. Signed-off-by: Daniel Mack <daniel@caiaq.de> Acked-by: Ville Syrjala <syrjala@sci.fi> Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
25 lines
661 B
C
25 lines
661 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);
|
|
};
|
|
|
|
#endif /* _LINUX_W1_GPIO_H */
|