commit b63a58a9916b94078e2a208b25e1cc3fc1b64d25
author Matthew Ellis <Matthew.Ellis@arm.com> Thu Jul 31 14:16:53 2025 +0100
committer Matthew Ellis <Matthew.Ellis@arm.com> Mon Dec 08 11:29:21 2025 +0000
tree 03d9d3c0037d453f68a65fae144a9afc68283d28
parent d012b9681304b7312948de345f9d7c79433bc576

feat: provide access to transport errors

Signed-off-by: Matthew Ellis <Matthew.Ellis@arm.com>
Change-Id: I20815f203fe7c91ee8b100dad9fc0ee09a05e5a4

include/tpm2.h

diff --git a/include/tpm2.h b/include/tpm2.h
index 16d22a0..5a29113 100644
--- a/include/tpm2.h
+++ b/include/tpm2.h
@@ -28,6 +28,8 @@
 	uint64_t (*timeout_init_us)(uint32_t usec);
 	bool (*timeout_elapsed)(uint64_t cnt);
 };
+int tpm_get_last_transport_error(void);
+
 int tpm_interface_init(const struct spi_plat *transport,
 		       const struct tpm_timeout_ops *timeout_ops,
 		       struct tpm_chip_data *chip_data, uint8_t locality);

include/tpm2_private.h

diff --git a/include/tpm2_private.h b/include/tpm2_private.h
index 17e925c..01e304c 100644
--- a/include/tpm2_private.h
+++ b/include/tpm2_private.h
@@ -106,6 +106,7 @@
 
 extern struct tpm_timeout_ops tpm_timeout_ops;
 extern const struct spi_plat *tpm_spidev;
+extern int tpm_last_transport_error;
 
 struct interface_ops *tpm_interface_getops(struct tpm_chip_data *chip_data,
 					   uint8_t locality);

src/tpm2_cmds.c

diff --git a/src/tpm2_cmds.c b/src/tpm2_cmds.c
index 56fbc55..1ce5afc 100644
--- a/src/tpm2_cmds.c
+++ b/src/tpm2_cmds.c
@@ -19,6 +19,7 @@
 
 static struct interface_ops *interface;
 struct tpm_timeout_ops tpm_timeout_ops;
+int tpm_last_transport_error = 0;
 
 static int tpm_xfer(struct tpm_chip_data *chip_data, const tpm_cmd *send,
 		    tpm_cmd *receive)
@@ -40,6 +41,11 @@
 	return TPM_SUCCESS;
 }
 
+int tpm_get_last_transport_error(void)
+{
+	return tpm_last_transport_error;
+}
+
 int tpm_interface_init(const struct spi_plat *transport,
 		       const struct tpm_timeout_ops *timeout_ops,
 		       struct tpm_chip_data *chip_data, uint8_t locality)

src/tpm2_fifo_spi.c

diff --git a/src/tpm2_fifo_spi.c b/src/tpm2_fifo_spi.c
index 0b260f7..a72868c 100644
--- a/src/tpm2_fifo_spi.c
+++ b/src/tpm2_fifo_spi.c
@@ -23,7 +23,11 @@
 
 static int tpm2_spi_transfer(const void *data_out, void *data_in, uint8_t len)
 {
-	return tpm_spidev->ops->xfer(tpm_spidev->priv, len, data_out, data_in);
+	int r = tpm_spidev->ops->xfer(tpm_spidev->priv, len, data_out, data_in);
+	if (r != 0) {
+		tpm_last_transport_error = r;
+	}
+	return r;
 }
 
 /*
@@ -132,7 +136,7 @@
 			       (access == TPM_ACCESS_READ) ? val : NULL, len);
 	if (rc != 0) {
 		tpm2_spi_end_transaction();
-		return rc;
+		return TPM_ERR_TRANSFER;
 	}
 
 	tpm2_spi_end_transaction();