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usb: gadget: uvc: Use custom strings if available 

If the user has defined a custom string descriptor for the IAD or the
VideoStreaming interfaces then set their index field to point to the
custom descriptor instead of the hardcoded defaults. If no custom
descriptors have been linked to, then use the default ones.

Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Link: https://lore.kernel.org/r/20230206161802.892954-12-dan.scally@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Scally 2023-02-06 16:18:02 +00:00 committed by Greg Kroah-Hartman
parent fe62575537
commit cf13d6e4a9
1 changed files with 13 additions and 5 deletions
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18
drivers/usb/gadget/function/f_uvc.c
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@ -745,6 +745,10 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
if (xu->string_descriptor_index)
xu->desc.iExtension = cdev->usb_strings[xu->string_descriptor_index].id;
/*
* We attach the hard-coded defaults incase the user does not provide
* any more appropriate strings through configfs.
*/
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));
@ -752,11 +756,15 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
ret = PTR_ERR(us);
goto error;
}
uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
ret = us[UVC_STRING_STREAMING_IDX].id;
uvc_streaming_intf_alt0.iInterface = ret;
uvc_streaming_intf_alt1.iInterface = ret;
uvc_iad.iFunction = opts->iad_index ? cdev->usb_strings[opts->iad_index].id :
us[UVC_STRING_CONTROL_IDX].id;
uvc_streaming_intf_alt0.iInterface = opts->vs0_index ?
cdev->usb_strings[opts->vs0_index].id :
us[UVC_STRING_STREAMING_IDX].id;
uvc_streaming_intf_alt1.iInterface = opts->vs1_index ?
cdev->usb_strings[opts->vs1_index].id :
us[UVC_STRING_STREAMING_IDX].id;
/* Allocate interface IDs. */
if ((ret = usb_interface_id(c, f)) < 0)