drivers: hwinfo: shell: Add reset cause shell command

This commit adds shell commands for the reset cause API
- show: show the persistent reset cause
- clear: clear the persistent reset cause
- supported: list all supported reset causes

Signed-off-by: Alexander Wachter <alexander.wachter@leica-geosystems.com>

drivers/hwinfo/hwinfo_shell.c

@@ -38,8 +38,149 @@ static int cmd_get_device_id(const struct shell *sh, size_t argc, char **argv)
 	return 0;
 }
 
+static inline const char *cause_to_string(uint32_t cause)
+{
+	switch (cause) {
+	case RESET_PIN:
+		return "pin";
+
+	case RESET_SOFTWARE:
+		return "software";
+
+	case RESET_BROWNOUT:
+		return "brownout";
+
+	case RESET_POR:
+		return "power-on reset";
+
+	case RESET_WATCHDOG:
+		return "watchdog";
+
+	case RESET_DEBUG:
+		return "debug";
+
+	case RESET_SECURITY:
+		return "security";
+
+	case RESET_LOW_POWER_WAKE:
+		return "low power wake-up";
+
+	case RESET_CPU_LOCKUP:
+		return "CPU lockup";
+
+	case RESET_PARITY:
+		return "parity error";
+
+	case RESET_PLL:
+		return "PLL error";
+
+	case RESET_CLOCK:
+		return "clock";
+
+	default:
+		return "unknown";
+	}
+}
+
+static void print_all_reset_causes(const struct shell *sh, uint32_t cause)
+{
+	for (uint32_t cause_mask = 1; cause_mask; cause_mask <<= 1) {
+		if (cause & cause_mask) {
+			shell_print(sh, "- %s",
+				    cause_to_string(cause & cause_mask));
+		}
+	}
+}
+
+static int cmd_show_reset_cause(const struct shell *sh, size_t argc,
+				char **argv)
+{
+	int res;
+	uint32_t cause;
+
+	ARG_UNUSED(argc);
+	ARG_UNUSED(argv);
+
+	res = hwinfo_get_reset_cause(&cause);
+	if (res == -ENOTSUP) {
+		shell_error(sh, "Not supported by hardware");
+		return res;
+	} else if (res != 0) {
+		shell_error(sh, "Error reading the cause [%d]", res);
+		return res;
+	}
+
+	if (cause != 0) {
+		shell_print(sh, "reset caused by:");
+		print_all_reset_causes(sh, cause);
+	} else {
+		shell_print(sh, "No reset cause set");
+	}
+
+	return 0;
+}
+
+static int cmd_clear_reset_cause(const struct shell *sh, size_t argc,
+				 char **argv)
+{
+	int res;
+
+	ARG_UNUSED(argc);
+	ARG_UNUSED(argv);
+
+	res = hwinfo_clear_reset_cause();
+	if (res == -ENOTSUP) {
+		shell_error(sh, "Not supported by hardware");
+	} else if (res != 0) {
+		shell_error(sh, "Error clearing the reset causes [%d]", res);
+		return res;
+	}
+
+	return 0;
+}
+
+static int cmd_supported_reset_cause(const struct shell *sh, size_t argc,
+				     char **argv)
+{
+	uint32_t cause;
+	int res;
+
+	ARG_UNUSED(argc);
+	ARG_UNUSED(argv);
+
+	res = hwinfo_get_supported_reset_cause(&cause);
+	if (res == -ENOTSUP) {
+		shell_error(sh, "Not supported by hardware");
+	} else if (res != 0) {
+		shell_error(sh, "Could not get the supported reset causes [%d]", res);
+		return res;
+	}
+
+	if (cause != 0) {
+		shell_print(sh, "supported reset causes:");
+		print_all_reset_causes(sh, cause);
+	} else {
+		shell_print(sh, "No causes supporte");
+	}
+
+	return 0;
+}
+
+SHELL_STATIC_SUBCMD_SET_CREATE(sub_reset_cause,
+	SHELL_CMD_ARG(show, NULL, "Show persistent reset causes",
+		      cmd_show_reset_cause, 1, 0),
+	SHELL_CMD_ARG(clear, NULL, "Clear all persistent reset causes",
+		      cmd_clear_reset_cause, 1, 0),
+	SHELL_CMD_ARG(supported, NULL,
+		      "Get a list of all supported reset causes",
+		      cmd_supported_reset_cause, 1, 0),
+	SHELL_SUBCMD_SET_END /* Array terminated. */
+);
+
 SHELL_STATIC_SUBCMD_SET_CREATE(sub_hwinfo,
 	SHELL_CMD_ARG(devid, NULL, "Show device id", cmd_get_device_id, 1, 0),
+	SHELL_CMD_ARG(reset_cause, &sub_reset_cause, "Reset cause commands",
+		      cmd_get_device_id, 1, 0),
 	SHELL_SUBCMD_SET_END /* Array terminated. */
 );