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