diff options
author | Daniel Mack <daniel@caiaq.de> | 2009-06-17 16:28:15 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-18 13:03:58 -0700 |
commit | c8a06c1ef0bc45915fc45a170c7c60426971304c (patch) | |
tree | 9e8f5d3890766bca481c15aac69ef96f52612874 /arch | |
parent | 9916219579d078c80377dd3988c2cc213536d868 (diff) |
w1-gpio: add external pull-up enable callback
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>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions