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| author | Pritam Manohar Sutar <pritam.sutar@samsung.com> | 2025-10-24 14:24:55 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-10-24 14:41:20 +0200 |
| commit | 389597581e3ef46940476f2d59c9ac7f9a26b113 (patch) | |
| tree | 108f58b8d91ebbab29666956f806e77e1cc7d6ca /rust/kernel/lib.rs | |
| parent | 30a34716562ee7871593158684d4495aa2aebd4a (diff) | |
usb: dwc3: Allow usb role swich control from userspace
There is a possibility of user needs for USB mode switching on boards
that lack external hardware support for dynamic host/device role
detection. This is particularly relevant in automotive applications
where userspace applications need to switch USB roles (host to device)
at runtime for CarPlay/Android Auto integration.
Add an `allow_userspace_control` flag to handle such cases. When
enabled, it exposes a sysfs attribute that allows userspace to switch
the USB role manually between host and device. This provides flexibility
for platforms that cannot rely on hardware-based mode detection.
The role switch can be done as below
echo host > /sys/class/usb_role/<ADDR>.usb-role-switch/role
echo device > /sys/class/usb_role/<ADDR>.usb-role-switch/role
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Pritam Manohar Sutar <pritam.sutar@samsung.com>
Link: https://patch.msgid.link/20251024085455.789555-1-pritam.sutar@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'rust/kernel/lib.rs')
0 files changed, 0 insertions, 0 deletions