ASoC: cs-amp-lib: Return attributes from cs_amp_get_efi_variable()

Add a pointer argument to cs_amp_get_efi_variable() to optionally
return the EFI variable attributes.

Originally this function internally consumed the attributes from
efi.get_variable(). The calling code did not use the attributes
so this was a small simplification.

However, when writing to a pre-existing variable we would want to
pass the existing attributes to efi.set_variable(). This patch
deals with the change to return the attribute in preparation for
adding code to update the variable.

Signed-off-by: Richard Fitzgerald <[e-mail]>
Reviewed-by: Takashi Iwai <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

include/sound/cs-amp-lib.h

···
 struct cs_amp_test_hooks {
 	efi_status_t (*get_efi_variable)(efi_char16_t *name,
 					 efi_guid_t *guid,
+					 u32 *returned_attr,
 					 unsigned long *size,
 					 void *buf);
 

sound/soc/codecs/cs-amp-lib-test.c

···
 /* Redirected get_efi_variable to simulate that the file is too short */
 static efi_status_t cs_amp_lib_test_get_efi_variable_nohead(efi_char16_t *name,
 							    efi_guid_t *guid,
+							    u32 *returned_attr,
 							    unsigned long *size,
 							    void *buf)
 {
···
 /* Redirected get_efi_variable to simulate that the count is larger than the file */
 static efi_status_t cs_amp_lib_test_get_efi_variable_bad_count(efi_char16_t *name,
 							       efi_guid_t *guid,
+							       u32 *returned_attr,
 							       unsigned long *size,
 							       void *buf)
 {
···
 /* Redirected get_efi_variable to simulate that the variable not found */
 static efi_status_t cs_amp_lib_test_get_efi_variable_none(efi_char16_t *name,
 							  efi_guid_t *guid,
+							  u32 *returned_attr,
 							  unsigned long *size,
 							  void *buf)
 {
···
 /* Redirected get_efi_variable to simulate reading a cal data blob */
 static efi_status_t cs_amp_lib_test_get_efi_variable(efi_char16_t *name,
 						     efi_guid_t *guid,
+						     u32 *returned_attr,
 						     unsigned long *size,
 						     void *buf)
 {
···
 
 	memcpy(buf, priv->cal_blob, priv->cal_blob->size);
 
+	if (returned_attr) {
+		*returned_attr = EFI_VARIABLE_NON_VOLATILE |
+				 EFI_VARIABLE_BOOTSERVICE_ACCESS |
+				 EFI_VARIABLE_RUNTIME_ACCESS;
+	}
+
 	return EFI_SUCCESS;
 }
 
 static efi_status_t cs_amp_lib_test_get_hp_cal_efi_variable(efi_char16_t *name,
 							    efi_guid_t *guid,
+							    u32 *returned_attr,
 							    unsigned long *size,
 							    void *buf)
 {
···
 	KUNIT_ASSERT_GE_MSG(test, ksize(buf), priv->cal_blob->size, "Buffer to small");
 
 	memcpy(buf, priv->cal_blob, priv->cal_blob->size);
+
+	if (returned_attr) {
+		*returned_attr = EFI_VARIABLE_NON_VOLATILE |
+				 EFI_VARIABLE_BOOTSERVICE_ACCESS |
+				 EFI_VARIABLE_RUNTIME_ACCESS;
+	}
 
 	return EFI_SUCCESS;
 }
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_lenovo_d0(efi_char16_t *name,
 							       efi_guid_t *guid,
+							       u32 *returned_attr,
 							       unsigned long *size,
 							       void *buf)
 {
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_lenovo_d1(efi_char16_t *name,
 							       efi_guid_t *guid,
+							       u32 *returned_attr,
 							       unsigned long *size,
 							       void *buf)
 {
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_lenovo_00(efi_char16_t *name,
 							       efi_guid_t *guid,
+							       u32 *returned_attr,
 							       unsigned long *size,
 							       void *buf)
 {
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_buf_too_small(efi_char16_t *name,
 								   efi_guid_t *guid,
+								   u32 *returned_attr,
 								   unsigned long *size,
 								   void *buf)
 {
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_hp_30(efi_char16_t *name,
 							   efi_guid_t *guid,
+							   u32 *returned_attr,
 							   unsigned long *size,
 							   void *buf)
 {
···
 
 static efi_status_t cs_amp_lib_test_get_efi_variable_hp_31(efi_char16_t *name,
 							   efi_guid_t *guid,
+							   u32 *returned_attr,
 							   unsigned long *size,
 							   void *buf)
 {

sound/soc/codecs/cs-amp-lib.c

···
 
 static efi_status_t cs_amp_get_efi_variable(efi_char16_t *name,
 					    efi_guid_t *guid,
+					    u32 *returned_attr,
 					    unsigned long *size,
 					    void *buf)
 {
 	u32 attr;
 
-	KUNIT_STATIC_STUB_REDIRECT(cs_amp_get_efi_variable, name, guid, size, buf);
+	if (!returned_attr)
+		returned_attr = &attr;
+
+	KUNIT_STATIC_STUB_REDIRECT(cs_amp_get_efi_variable, name, guid,
+				   returned_attr, size, buf);
 
 	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
-		return efi.get_variable(name, guid, &attr, size, buf);
+		return efi.get_variable(name, guid, returned_attr, size, buf);
 
 	return EFI_NOT_FOUND;
 }
···
 	for (i = 0; i < ARRAY_SIZE(cs_amp_lib_cal_efivars); i++) {
 		status = cs_amp_get_efi_variable(cs_amp_lib_cal_efivars[i].name,
 						 cs_amp_lib_cal_efivars[i].guid,
-						 &data_size, NULL);
+						 NULL, &data_size, NULL);
 		if (status == EFI_BUFFER_TOO_SMALL)
 			break;
 	}
···
 
 	status = cs_amp_get_efi_variable(cs_amp_lib_cal_efivars[i].name,
 					 cs_amp_lib_cal_efivars[i].guid,
-					 &data_size, data);
+					 NULL, &data_size, data);
 	if (status != EFI_SUCCESS) {
 		ret = -EINVAL;
 		goto err;
···
 	int i, ret;
 
 	size = sizeof(spkid);
-	status = cs_amp_get_efi_variable(info->name, info->guid, &size, &spkid);
+	status = cs_amp_get_efi_variable(info->name, info->guid, NULL, &size, &spkid);
 	ret = cs_amp_convert_efi_status(status);
 	if (ret < 0)
 		return ret;