diff options
Diffstat (limited to 'drivers/staging/greybus/Documentation/sysfs-bus-greybus')
| -rw-r--r-- | drivers/staging/greybus/Documentation/sysfs-bus-greybus | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/staging/greybus/Documentation/sysfs-bus-greybus b/drivers/staging/greybus/Documentation/sysfs-bus-greybus index 4b511dbff0da..ab728a46e657 100644 --- a/drivers/staging/greybus/Documentation/sysfs-bus-greybus +++ b/drivers/staging/greybus/Documentation/sysfs-bus-greybus @@ -113,3 +113,16 @@ KernelVersion: 4.XX Contact: Greg Kroah-Hartman <greg@kroah.com> Description: The device id of a Greybus bundle. + +What: /sys/bus/greybus/device/.../state +Date: October 2015 +KernelVersion: 4.XX +Contact: Greg Kroah-Hartman <greg@kroah.com> +Description: + A bundle has a state that is managed by the userspace + Endo process. This file allows that Endo to signal + other Android HALs that the state of the bundle has + changed to a specific value. When written to, any + process watching the file will be woken up, and the new + value can be read. It's a "poor-man's IPC", yes, but + simplifies the Android userspace code immensely. |