user/sven/linux.git/include/linux/w1-gpio.h, branch v3.2.78Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v3.2.782009-06-18T20:03:58Zw1-gpio: add external pull-up enable callback2009-06-18T20:03:58ZDaniel Mackdaniel@caiaq.de2009-06-17T23:28:15Zurn:sha1:c8a06c1ef0bc45915fc45a170c7c60426971304c
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>
w1-gpio: add GPIO w1 bus master driver2008-02-06T18:41:15ZVille Syrjalasyrjala@sci.fi2008-02-06T09:39:01Zurn:sha1:ad8dc96e3b2c3e28854e0de4ab49351ed547b30c
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>