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usb: gadget: uvc: Pick up custom string descriptor IDs

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If any custom string descriptors have been linked to from the
extension unit, pick up the string ID that was returned when
the strings were attached to the composite dev and use it to
set the iExtension field of the Extension Unit Descriptor.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20230206161802.892954-10-dan.scally@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Scally 2023-02-06 16:18:00 +00:00 committed by Greg Kroah-Hartman
parent 08ddd71bf0
commit 9963f7440f
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/gadget/function/f_uvc.c
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@ -644,6 +644,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct uvc_device *uvc = to_uvc(f);
struct uvcg_extension *xu;
struct usb_string *us;
unsigned int max_packet_mult;
unsigned int max_packet_size;
@ -736,6 +737,14 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
/*
* XUs can have an arbitrary string descriptor describing them. If they
* have one pick up the ID.
*/
list_for_each_entry(xu, &opts->extension_units, list)
if (xu->string_descriptor_index)
xu->desc.iExtension = cdev->usb_strings[xu->string_descriptor_index].id;
uvc_en_us_strings[UVC_STRING_CONTROL_IDX].s = opts->function_name;
us = usb_gstrings_attach(cdev, uvc_function_strings,
ARRAY_SIZE(uvc_en_us_strings));