usb: core: added uevent for over-current

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After commit 1cbd53c8cd ("usb: core: introduce per-port over-current
counters") usb ports expose a sysfs value 'over_current_count'
to user space. This value on its own is not very useful as it requires
manual polling.

As a solution, fire a udev event from the usb hub device that specifies
the values 'OVER_CURRENT_PORT' and 'OVER_CURRENT_COUNT' that indicate
the path of the usb port where the over-current event occurred and the
value of 'over_current_count' in sysfs. Additionally, call
sysfs_notify() so the sysfs value supports poll().

Signed-off-by: Jon Flatley <jflat@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jon Flatley 2018-09-20 10:17:54 -07:00 • committed by Greg Kroah-Hartman

parent ea3b4d5523

commit 201af55da8

2 changed files with 44 additions and 1 deletions

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9

Documentation/ABI/testing/sysfs-bus-usb

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36

drivers/usb/core/hub.c

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