diff options
| author | Michael Grzeschik <m.grzeschik@pengutronix.de> | 2022-06-07 13:45:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-12 06:49:46 +0200 |
| commit | f061f43d7418cb62b8d073e221ec75d3f5b89e17 (patch) | |
| tree | 59d311ae1af0105d165ee26ec129c122c9e6e545 /drivers/usb/core/hub.h | |
| parent | 5fd6c4f0a649c956b2c50c18e0da765b7f5e3eff (diff) | |
usb: hub: port: add sysfs entry to switch port power
In some cases the port of an hub needs to be disabled or switched off
and on again. E.g. when the connected device needs to be re-enumerated.
Or it needs to be explicitly disabled while the rest of the usb tree
stays working.
For this purpose this patch adds an sysfs switch to enable/disable the
port on any hub. In the case the hub is supporting power switching, the
power line will be disabled to the connected device.
When the port gets disabled, the associated device gets disconnected and
removed from the logical usb tree. No further device will be enumerated
on that port until the port gets enabled again.
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220607114522.3359148-1-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/core/hub.h')
| -rw-r--r-- | drivers/usb/core/hub.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h index 22ea1f4f2d66..3fcb38099ce3 100644 --- a/drivers/usb/core/hub.h +++ b/drivers/usb/core/hub.h @@ -121,6 +121,9 @@ extern int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected); extern int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature); +extern int usb_hub_port_status(struct usb_hub *hub, int port1, + u16 *status, u16 *change); +extern int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus); static inline bool hub_is_port_power_switchable(struct usb_hub *hub) { |