1 files changed, 74 insertions, 4 deletions

diff --git a/cmd/tpm-common.c b/cmd/tpm-common.c
index 38900fb..3014255 100644
--- a/cmd/tpm-common.c
+++ b/cmd/tpm-common.c
@@ -7,11 +7,14 @@
 #include <command.h>
 #include <dm.h>
 #include <env.h>
+#include <malloc.h>
 #include <asm/unaligned.h>
 #include <linux/string.h>
 #include <tpm-common.h>
 #include "tpm-user-utils.h"
 
+static struct udevice *tpm_dev;
+
 /**
  * Print a byte string in hexdecimal format, 16-bytes per line.
  *
@@ -231,19 +234,86 @@ int type_string_write_vars(const char *type_str, u8 *data,
 	return 0;
 }
 
+static int tpm_show_device(void)
+{
+	struct udevice *dev;
+	char buf[80];
+	int n = 0, rc;
+
+	for_each_tpm_device(dev) {
+		rc = tpm_get_desc(dev, buf, sizeof(buf));
+		if (rc < 0)
+			printf("device %d: can't get info\n", n);
+		else
+			printf("device %d: %s\n", n, buf);
+
+		n++;
+	};
+
+	return 0;
+}
+
+static int tpm_set_device(unsigned long num)
+{
+	struct udevice *dev;
+	unsigned long n = 0;
+	int rc = CMD_RET_FAILURE;
+
+	for_each_tpm_device(dev) {
+		if (n == num) {
+			rc = 0;
+			break;
+		}
+
+		n++;
+	}
+
+	if (!rc)
+		tpm_dev = dev;
+
+	return rc;
+}
+
 int get_tpm(struct udevice **devp)
 {
 	int rc;
 
-	rc = uclass_first_device_err(UCLASS_TPM, devp);
-	if (rc) {
-		printf("Could not find TPM (ret=%d)\n", rc);
-		return CMD_RET_FAILURE;
+	/*
+	 * To keep a backward compatibility with previous code,
+	 * if a tpm device is not explicitly set, we set the first one.
+	 */
+	if (!tpm_dev) {
+		rc = tpm_set_device(0);
+		if (rc) {
+			printf("Couldn't set TPM 0 (rc = %d)\n", rc);
+			return CMD_RET_FAILURE;
+		}
 	}
 
+	if (devp)
+		*devp = tpm_dev;
+
 	return 0;
 }
 
+int do_tpm_device(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	unsigned long num;
+	int rc;
+
+	if (argc == 2) {
+		num = simple_strtoul(argv[1], NULL, 10);
+
+		rc = tpm_set_device(num);
+		if (rc)
+			printf("Couldn't set TPM %lu (rc = %d)\n", num, rc);
+	} else {
+		rc = tpm_show_device();
+	}
+
+	return rc;
+}
+
 int do_tpm_info(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct udevice *dev;