cmd: Add pause command
This command is being introduced with the goal of allowing user-friendly
"generic use case" U-Boot builds to pause until user input under some
situations.
The main use case would be when a boot failure happens, to pause until
the user has had time to acknowledge the current state.
Tested using:
make && ./u-boot -v -T -c 'ut lib lib_test_hush_pause'
Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
Cc: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 211ebe9..67c7d25 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1971,6 +1971,12 @@
milliseconds. See also the 'bootstage' command which provides more
flexibility for boot timing.
+config CMD_PAUSE
+ bool "pause command"
+ help
+ Delay execution waiting for any user input.
+ Useful to allow the user to read a failure log.
+
config CMD_RNG
bool "rng command"
depends on DM_RNG
diff --git a/cmd/Makefile b/cmd/Makefile
index 6e87522..7abe1d3 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -102,6 +102,7 @@
obj-$(CONFIG_CMD_MII) += mii.o
obj-$(CONFIG_CMD_MISC) += misc.o
obj-$(CONFIG_CMD_MDIO) += mdio.o
+obj-$(CONFIG_CMD_PAUSE) += pause.o
obj-$(CONFIG_CMD_SLEEP) += sleep.o
obj-$(CONFIG_CMD_MMC) += mmc.o
obj-$(CONFIG_CMD_OPTEE_RPMB) += optee_rpmb.o
diff --git a/cmd/pause.c b/cmd/pause.c
new file mode 100644
index 0000000..c97833c
--- /dev/null
+++ b/cmd/pause.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2021
+ * Samuel Dionne-Riel <samuel@dionne-riel.com>
+ */
+
+#include <command.h>
+#include <stdio.h>
+
+static int do_pause(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+ char *message = "Press any key to continue...";
+
+ if (argc == 2)
+ message = argv[1];
+
+ /* No newline, so it sticks to the bottom of the screen */
+ printf("%s", message);
+
+ /* Wait on "any" key... */
+ (void) getchar();
+
+ /* Since there was no newline, we need it now */
+ printf("\n");
+
+ return CMD_RET_SUCCESS;
+}
+
+U_BOOT_CMD(pause, 2, 1, do_pause,
+ "delay until user input",
+ "[prompt] - Wait until users presses any key. [prompt] can be used to customize the message.\n"
+);