[U-Boot] [PATCH 1/1] cmd: add conitrace command

[Heinrich Schuchardt]

The 'conitrace' command prints the codes received from the console input as
hexadecimal numbers.

This developer utility is useful for testing the handling of special keys
by keyboard drivers.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 cmd/Kconfig     |  6 ++++++
 cmd/Makefile    |  1 +
 cmd/conitrace.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 cmd/conitrace.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 13d4c991bf..cf97a0f2be 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1338,6 +1338,12 @@ config CMD_CACHE
 	help
 	  Enable the "icache" and "dcache" commands
 
+config CMD_CONITRACE
+	bool "conitrace - trace console input codes"
+	help
+	  Enable the 'conitrace' command which displays the codes received
+	  from the console input as hexadecimal numbers.
+
 config CMD_DISPLAY
 	bool "Enable the 'display' command, for character displays"
 	help
diff --git a/cmd/Makefile b/cmd/Makefile
index 3487c80455..88045dea97 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_CMD_CACHE) += cache.o
 obj-$(CONFIG_CMD_CBFS) += cbfs.o
 obj-$(CONFIG_CMD_CLK) += clk.o
 obj-$(CONFIG_CMD_CONFIG) += config.o
+obj-$(CONFIG_CMD_CONITRACE) += conitrace.o
 obj-$(CONFIG_CMD_CONSOLE) += console.o
 obj-$(CONFIG_CMD_CPU) += cpu.o
 obj-$(CONFIG_DATAFLASH_MMC_SELECT) += dataflash_mmc_mux.o
diff --git a/cmd/conitrace.c b/cmd/conitrace.c
new file mode 100644
index 0000000000..85c5422b7e
--- /dev/null
+++ b/cmd/conitrace.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * The 'conitrace' command prints the codes received from the console input as
+ * hexadecimal numbers.
+ *
+ * Copyright (c) 2018, Heinrich Schuchardt <xypron.glpk at gmx.de>
+ */
+#include <common.h>
+#include <command.h>
+
+static int do_conitrace(cmd_tbl_t *cmdtp, int flag, int argc,
+			char * const argv[])
+{
+	bool first = true;
+
+	printf("Waiting for your input\n");
+	printf("To terminate type 'x'\n");
+
+	/* Empty input buffer */
+	while (tstc())
+		getc();
+
+	for (;;) {
+		int c = getc();
+
+		if (first && (c == 'x' || c == 'X'))
+			break;
+
+		printf("%02x ", c);
+		first = false;
+
+		/* 1 ms delay - serves to detect separate keystrokes */
+		udelay(1000);
+		if (!tstc()) {
+			printf("\n");
+			first = true;
+		}
+	}
+
+	return CMD_RET_SUCCESS;
+}
+
+#ifdef CONFIG_SYS_LONGHELP
+static char conitrace_help_text[] = "";
+#endif
+
+U_BOOT_CMD_COMPLETE(
+	conitrace, 2, 0, do_conitrace,
+	"trace console input",
+	conitrace_help_text, NULL
+);
-- 
2.18.0