greybus: bundle: add state sysfs file

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A bundle has a state file, that is managed by the endo userspace
process.  This file can be written to and any process that is polling on
the file will be woken up and can read the new value.  It's a "cheap"
IPC for programs that are not allowed to do anything other than
read/write to kernel sysfs files.

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

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This commit is contained in:

Greg Kroah-Hartman 2015-04-13 19:48:37 +02:00

parent 1ffc12be55

commit 75052a5504

3 changed files with 49 additions and 2 deletions

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13

drivers/staging/greybus/Documentation/sysfs-bus-greybus

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37

drivers/staging/greybus/bundle.c

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1

drivers/staging/greybus/bundle.h

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