interface for configuring freefall/wakeup interrupts for the accelerometers

Hi!

First: Unfortunately, the freerunner currently wakes up immediately on
suspend when the accelerometer IRQ is selected as a wakeup source. I'm
posting this for comments and if someone else wants to have a look at
this problem.

The patch should be safe to apply even though the sleep portion doesn't
work - as long as it's configured it will not disturb anything.

// Simon
--
lis302dl-configure-wakeup-interrupts.patch

From: simon.kagstrom <simon.kagstrom@gmail.com>

First: Unfortunately, the freerunner currently wakes up immediately on
suspend when the accelerometer IRQ is selected as a wakeup source.


Add configuration of wakeup/freefall interrupts through a sysfs
interface. Configuration is done through echoing a value of the
form

   X Y Z THRESHOLD DURATION SPEC

to freefall_wakeup_1/2. X, Y and Z are threshold values, given as a
value > 0, < 0 or 0 to specify if an interrupt should be generated for
high or low thresholds or neither (off). THRESHOLD specifies the
threshold that must be exceeded. DURATION specifies the time in
milliseconds for which the acceleration should be measured. SPEC is
either '1' or '0' and specifies if the thresholds should be taken all
together or one at a time ('and' or 'or' mode).

Echoing '0' to the file turns off the interrupts.

Example:

  echo "1 1 1 60 60 0" > freefall_wakeup_1   # Turn on x,y,z, 60ms/60 threshold, or-mode
  echo "0" > freefall_wakeup_1 # Turn off interrupt

The hardware supports two simulataneous wakeup sources to be configured,
but the freerunner only connects one of the interrupt outputs. The patch
exports both. Similarly, only the "top" accelerometer can be used as a
wake-up source, and it's not possible to generate DATA_READY interrupts
while the wakeup interrupts are active.

Signed-off-by: Simon Kagstrom <simon.kagstrom@gmail.com>

0 files changed, 0 insertions, 0 deletions