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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2023-03-17 17:47:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-23 17:25:22 +0100 |
| commit | edf1664f3249a091a2b91182fc087b3253b0b4c2 (patch) | |
| tree | 918498c17a1bc58093dac442d4429dc04ee3b802 /drivers/usb/host/xhci-dbgcap.h | |
| parent | 4feb07d0ada339f7edc0dc3b24581f201848a65b (diff) | |
| download | lwn-edf1664f3249a091a2b91182fc087b3253b0b4c2.tar.gz lwn-edf1664f3249a091a2b91182fc087b3253b0b4c2.zip | |
xhci: dbc: Provide sysfs option to configure dbc descriptors
When DbC is enabled the first port on the xHC host acts as a usb device.
xHC provides the descriptors automatically when the DbC device is
enumerated. Most of the values are hardcoded, but some fields such as
idProduct, idVendor, bcdDevice and bInterfaceProtocol can be modified.
Add sysfs entries that allow userspace to change these.
User can only change them before dbc is enabled, i.e. before writing
"enable" to dbc sysfs file as we don't want these values to change while
device is connected, or during enumeration.
Add documentation for these entries in
Documentation/ABI/testing/sysfs-bus-pci-drivers-xhci_hcd
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20230317154715.535523-9-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci-dbgcap.h')
| -rw-r--r-- | drivers/usb/host/xhci-dbgcap.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-dbgcap.h b/drivers/usb/host/xhci-dbgcap.h index ca04192fdab1..51a7ab3ba0ca 100644 --- a/drivers/usb/host/xhci-dbgcap.h +++ b/drivers/usb/host/xhci-dbgcap.h @@ -132,6 +132,10 @@ struct xhci_dbc { struct dbc_str_descs *string; dma_addr_t string_dma; size_t string_size; + u16 idVendor; + u16 idProduct; + u16 bcdDevice; + u8 bInterfaceProtocol; enum dbc_state state; struct delayed_work event_work; |