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w1-gpio: add GPIO w1 bus master driver

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Add a GPIO 1-wire bus master driver.  The driver used the GPIO API to
control the wire and the GPIO pin can be specified using platform data
similar to i2c-gpio.  The driver was tested with AT91SAM9260 + DS2401.

Signed-off-by: Ville Syrjala <syrjala@sci.fi>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ville Syrjala 2008-02-06 01:39:01 -08:00 • committed by Linus Torvalds
parent 4cdf854f7d
commit ad8dc96e3b
6 changed files with 193 additions and 0 deletions
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23
include/linux/w1-gpio.h Normal file
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/*
* 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;
};
#endif /* _LINUX_W1_GPIO_H */