tpm-backend: Made few interface methods optional

This allows backend implementations left optional interface methods.
For mandatory methods assertion checks added.

Took the opportunity to remove unused methods:
 - tpm_backend_get_desc()
 - TPMDriverOps->handle_startup_error

Signed-off-by: Amarnath Valluri <amarnath.valluri@intel.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Stefan Berger<stefanb@linux.vnet.ibm.com>
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

1 files changed, 2 insertions, 11 deletions

diff --git a/include/sysemu/tpm_backend.h b/include/sysemu/tpm_backend.h
index 202ec8d..9ea7072 100644
--- a/include/sysemu/tpm_backend.h
+++ b/include/sysemu/tpm_backend.h
@@ -47,6 +47,7 @@ struct TPMBackend {
     TPMState *tpm_state;
     GThreadPool *thread_pool;
     TPMRecvDataCB *recv_data_callback;
+    bool had_startup_error;
 
     char *id;
     enum TpmModel fe_model;
@@ -75,7 +76,7 @@ struct TPMDriverOps {
     enum TpmType type;
     const QemuOptDesc *opts;
     /* get a descriptive text of the backend to display to the user */
-    const char *(*desc)(void);
+    const char *desc;
 
     TPMBackend *(*create)(QemuOpts *opts, const char *id);
 
@@ -83,8 +84,6 @@ struct TPMDriverOps {
     int (*init)(TPMBackend *t);
     /* start up the TPM on the backend */
     int (*startup_tpm)(TPMBackend *t);
-    /* returns true if nothing will ever answer TPM requests */
-    bool (*had_startup_error)(TPMBackend *t);
 
     size_t (*realloc_buffer)(TPMSizedBuffer *sb);
 
@@ -109,14 +108,6 @@ struct TPMDriverOps {
 enum TpmType tpm_backend_get_type(TPMBackend *s);
 
 /**
- * tpm_backend_get_desc:
- * @s: the backend
- *
- * Returns a human readable description of the backend.
- */
-const char *tpm_backend_get_desc(TPMBackend *s);
-
-/**
  * tpm_backend_init:
  * @s: the backend to initialized
  * @state: TPMState