tpm: Add a 'tpm info' command

Add a command to display basic information about a TPM such as the model and
open/close state. This can be useful for debugging.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: Heiko Schocher <hs@denx.de>

diff --git a/common/cmd_tpm.c b/common/cmd_tpm.c
index e9c661821ce747e41ec099ba081fc32697035da6..97501cc3d1896342c4b5da6372bf10c177274e75 100644 (file)
--- a/common/cmd_tpm.c
+++ b/common/cmd_tpm.c
@@ -456,6 +456,26 @@ static int get_tpm(struct udevice **devp)
 
        return 0;
 }
+
+static int do_tpm_info(cmd_tbl_t *cmdtp, int flag, int argc,
+                      char *const argv[])
+{
+       struct udevice *dev;
+       char buf[80];
+       int rc;
+
+       rc = get_tpm(&dev);
+       if (rc)
+               return rc;
+       rc = tpm_get_desc(dev, buf, sizeof(buf));
+       if (rc < 0) {
+               printf("Couldn't get TPM info (%d)\n", rc);
+               return CMD_RET_FAILURE;
+       }
+       printf("%s\n", buf);
+
+       return 0;
+}
 #endif
 
 static int do_tpm_raw_transfer(cmd_tbl_t *cmdtp, int flag,
@@ -637,6 +657,9 @@ TPM_COMMAND_NO_ARG(tpm_end_oiap)
        U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
 
 static cmd_tbl_t tpm_commands[] = {
+#ifdef CONFIG_DM_TPM
+       U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
+#endif
        U_BOOT_CMD_MKENT(init, 0, 1,
                        do_tpm_init, "", ""),
        U_BOOT_CMD_MKENT(startup, 0, 1,
@@ -707,6 +730,9 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
 "cmd args...\n"
 "    - Issue TPM command <cmd> with arguments <args...>.\n"
 "Admin Startup and State Commands:\n"
+#ifdef CONFIG_DM_TPM
+"  info - Show information about the TPM\n"
+#endif
 "  init\n"
 "    - Put TPM into a state where it waits for 'startup' command.\n"
 "  startup mode\n"