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drivers/w1/masters/w1-gpio.c: add strong pullup emulation

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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>
This commit is contained in:
Evgeny Boger
2014-01-23 15:56:18 -08:00
committed by Linus Torvalds
parent 63509beaf7
commit 3089a4c8d3
3 changed files with 23 additions and 12 deletions
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include/linux/w1-gpio.h
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@@ -20,6 +20,7 @@ struct w1_gpio_platform_data {
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 */