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[efi] Delegate to child device's EFI_COMPONENT_NAME2_PROTOCOL, if present

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EFI's device naming model requires drivers to provide names for child
devices.  Allow the driver's GetControllerName() method to delegate to
an instance of EFI_COMPONENT_NAME2_PROTOCOL installed on the child
device itself (if present); this allows the SNP device to expose its
own device name via the PCI driver's GetControllerName() method.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-11-21 02:37:55 +00:00
parent d6b0b76a05
commit 1a79f6f37a
1 changed files with 22 additions and 5 deletions
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27
src/interface/efi/efi_driver.c
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@ -90,12 +90,29 @@ efi_driver_get_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf,
*/
static EFI_STATUS EFIAPI
efi_driver_get_controller_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf __unused,
EFI_HANDLE device __unused,
EFI_HANDLE child __unused,
CHAR8 *language __unused,
CHAR16 **controller_name __unused ) {
EFI_HANDLE device, EFI_HANDLE child,
CHAR8 *language, CHAR16 **controller_name ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
union {
EFI_COMPONENT_NAME2_PROTOCOL *name2;
void *interface;
} name2;
EFI_STATUS efirc;
/* Just let EFI use the default Device Path Name */
/* Delegate to the EFI_COMPONENT_NAME2_PROTOCOL instance
* installed on child handle, if present.
*/
if ( ( child != NULL ) &&
( ( efirc = bs->OpenProtocol (
child, &efi_component_name2_protocol_guid,
&name2.interface, NULL, NULL,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ) ) == 0 ) ) {
return name2.name2->GetControllerName ( name2.name2, device,
child, language,
controller_name );
}
/* Otherwise, let EFI use the default Device Path Name */
return EFI_UNSUPPORTED;
}