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authorShinya Kuribayashi <shinya.kuribayashi.px@renesas.com>2012-05-10 13:02:38 +0900
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-14 09:02:23 -0700
commite44694e858ed000ef11ee37861c7f7c86d8ddbda (patch)
tree76c8b6f7f5e9bff4413729e0cfe08c9ae00dcf25 /drivers/usb/core/hub.c
parenta6dc9cf76b9c39ccffe083f09f995ce2502f5773 (diff)
USB: gpio_vbus: avoid consecutive vbus_session calls with the same "is_active"
Basically, ->vbus_session() calls should be served when VBUS session starts and ends (it's not whenever transciever drivers detect VBUS _changes_). Otherwise, if UDC gadget drivers don't want for some reason ->vbus_session() calls with the same "is_active" value, either OTG or UDC drivers need to have some protection handlings. Also, on platforms using this 'gpio_vbus' driver, the driver is only allowed to check whether VBUS is applied. There is no kernel-standard way prepared for UDC gadget drivers to do that. With this in mind, gpio_vbus should try to prevent unnecessary consecutive vbus_session calls being served with the same "in_active" value. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hub.c')
0 files changed, 0 insertions, 0 deletions