tree d5d08172500e1b7bca0317bf29f6dd917b034200
parent ec312310e43acd5bb8b49314c6d472bb60d2d30c
author Jim Cromie <jim.cromie@gmail.com> 1151402066 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151454763 -0700

[PATCH] chardev: GPIO for SCx200 & PC-8736x: display pin values in/out in gpio_dump

Add current pin settings to gpio_dump() output.  This adds the last 'word' to
the syslog lines, which displays the input and output values that the pin is
set to.

  pc8736x_gpio.0: io00: 0x0044 TS OD PUE  EDGE LO DEBOUNCE        io:1/1

The 2 values may differ for a number of reasons:
1- the pin output circuitry is diaabled, (as the above 'TS' indicates)
2- it needs a pullup resistor to drive the attached circuit,
3- the external circuit needs a pullup so the open-drain has something
   to pull-down
4- the pin is wired to Vcc or Ground

It might be appropriate to add a WARN for 2,3,4, since they could
damage the chip and/or circuit, esp if misconfig goes unnoticed.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>