diff --git a/cli_config.c b/cli_config.c
new file mode 100644
index 0000000..3ffa048
--- /dev/null
+++ b/cli_config.c
@@ -0,0 +1,264 @@
+/*
+ * This file is part of the flashprog project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include "libflashprog.h"
+#include "chipdrivers.h"
+#include "flash.h"
+#include "cli.h"
+
+enum settings {
+	QUAD_ENABLE,
+};
+
+static const struct reg_bit_info *get_bit_info(
+		const struct flashctx *flash, enum settings setting)
+{
+	switch (setting) {
+	case QUAD_ENABLE:
+		return &flash->chip->reg_bits.qe;
+	default:
+		return NULL;
+	}
+}
+
+static int config_get(const struct flashctx *flash, enum settings setting)
+{
+	const struct reg_bit_info *const bit = get_bit_info(flash, setting);
+	uint8_t reg_val;
+
+	if (!bit)
+		return 1;
+
+	const int ret = spi_read_register(flash, bit->reg, &reg_val);
+	if (ret)
+		return 1;
+
+	printf("%u\n", reg_val >> bit->bit_index & 1);
+	return 0;
+}
+
+static int config_set(const struct flashctx *flash, enum settings setting, unsigned int value)
+{
+	const struct reg_bit_info *const bit = get_bit_info(flash, setting);
+	uint8_t reg_val;
+	int ret;
+
+	if (!bit)
+		return 1;
+
+	ret = spi_read_register(flash, bit->reg, &reg_val);
+	if (ret)
+		return 1;
+
+	reg_val &= ~(1 << bit->bit_index);
+	reg_val |= (value & 1) << bit->bit_index;
+
+	ret = spi_write_register(flash, bit->reg, reg_val, default_wrsr_target(flash));
+	if (ret)
+		return 1;
+
+	return 0;
+}
+
+static void usage(const char *const name, const char *const msg)
+{
+	if (msg)
+		fprintf(stderr, "\nError: %s\n", msg);
+
+	fprintf(stderr, "\nUsage:"
+			"\t%s [get] <options> <setting>\n"
+			"\t%s  set  <options> [--temporary] <setting> <value>\n",
+			name, name);
+	print_generic_options();
+	fprintf(stderr, "\n<setting> can be\n"
+			"    qe | quad-enable        Quad-Enable (QE) bit\n"
+			"\nand <value> can be `true', `false', or a number.\n"
+			"\nBy default, the setting is queried (`get').\n"
+			"\n");
+	exit(1);
+}
+
+static int parse_setting(const char *const setting)
+{
+	if (!strcmp(setting, "qe") ||
+	    !strcmp(setting, "quad-enable"))
+		return QUAD_ENABLE;
+	return -1;
+}
+
+static int parse_value(const char *const value)
+{
+	if (!strcmp(value, "true"))
+		return 1;
+	if (!strcmp(value, "false"))
+		return 0;
+
+	char *endptr;
+	const unsigned long i = strtoul(value, &endptr, 0);
+	if (value[0] && !endptr[0] && i <= INT_MAX)
+		return i;
+
+	return -1;
+}
+
+int flashprog_config_main(int argc, char *argv[])
+{
+	static const char optstring[] = "+p:c:Vo:h";
+	static const struct option long_options[] = {
+		{"programmer",		1, NULL, 'p'},
+		{"chip",		1, NULL, 'c'},
+		{"verbose",		0, NULL, 'V'},
+		{"output",		1, NULL, 'o'},
+		{"help",		0, NULL, 'h'},
+		{"get",			0, NULL, OPTION_CONFIG_GET},
+		{"set",			0, NULL, OPTION_CONFIG_SET},
+		{"temporary",		0, NULL, OPTION_CONFIG_VOLATILE},
+		{NULL,			0, NULL, 0},
+	};
+	static const struct opt_command cmd_options[] = {
+		{"get",		OPTION_CONFIG_GET},
+		{"set",		OPTION_CONFIG_SET},
+		{NULL,		0},
+	};
+
+	unsigned int ops = 0;
+	int ret = 1, opt;
+	struct log_args log_args = { FLASHPROG_MSG_INFO, FLASHPROG_MSG_DEBUG2, NULL };
+	struct flash_args flash_args = { 0 };
+	bool get = false, set = false, volat1le = false;
+
+	if (cli_init()) /* TODO: Can be moved below argument parsing once usage() uses `stderr` directly. */
+		goto free_ret;
+
+	if (argc < 2)
+		usage(argv[0], NULL);
+
+	while ((opt = getopt_long(argc, argv, optstring, long_options, NULL)) != -1 ||
+	       (opt = getopt_command(argc, argv, cmd_options)) != -1) {
+		switch (opt) {
+		case 'V':
+		case 'o':
+			ret = cli_parse_log_args(&log_args, opt, optarg);
+			if (ret == 1)
+				usage(argv[0], NULL);
+			else if (ret)
+				goto free_ret;
+			break;
+		case 'p':
+		case 'c':
+			ret = cli_parse_flash_args(&flash_args, opt, optarg);
+			if (ret == 1)
+				usage(argv[0], NULL);
+			else if (ret)
+				goto free_ret;
+			break;
+		case OPTION_CONFIG_GET:
+			get = true;
+			++ops;
+			break;
+		case OPTION_CONFIG_SET:
+			set = true;
+			++ops;
+			break;
+		case OPTION_CONFIG_VOLATILE:
+			volat1le = true;
+			break;
+		case '?':
+		case 'h':
+			usage(argv[0], NULL);
+			break;
+		}
+	}
+
+	if (!ops) {
+		get = true;
+		++ops;
+	}
+
+	if (ops > 1)
+		usage(argv[0], "Only one operation may be specified.");
+
+	if (!set && volat1le)
+		usage(argv[0], "`--temporary' may only be specified for `set'.");
+	if (get && optind != argc - 1)
+		usage(argv[0], "`get' requires exactly one argument.");
+	if (set && optind != argc - 2)
+		usage(argv[0], "`set' requires exactly two arguments.");
+
+	if (!flash_args.prog_name)
+		usage(argv[0], "No programmer specified.");
+
+	const int setting = parse_setting(argv[optind]);
+	if (setting < 0) {
+		fprintf(stderr, "\nError: Unknown <setting> argument `%s'.\n", argv[optind]);
+		usage(argv[0], NULL);
+	}
+	int value = 0;
+	if (set) {
+		value = parse_value(argv[optind + 1]);
+		if (value < 0) {
+			fprintf(stderr, "\nError: Cannot parse value `%s'.\n", argv[optind + 1]);
+			usage(argv[0], NULL);
+		}
+	}
+
+	struct flashprog_programmer *prog;
+	struct flashprog_flashctx *flash;
+	ret = 1;
+
+	if (log_args.logfile && open_logfile(log_args.logfile))
+		goto free_ret;
+	verbose_screen = log_args.screen_level;
+	verbose_logfile = log_args.logfile_level;
+	start_logging();
+
+	if (flashprog_programmer_init(&prog, flash_args.prog_name, flash_args.prog_args))
+		goto free_ret;
+	if (flashprog_flash_probe(&flash, prog, flash_args.chip)) {
+		fprintf(stderr, "No EEPROM/flash device found.\n");
+		goto shutdown_ret;
+	}
+
+	if (flash->chip->bustype != BUS_SPI || flash->chip->spi_cmd_set != SPI25) {
+		fprintf(stderr, "Only SPI25 flash chips are supported.\n");
+		goto shutdown_ret;
+	}
+
+	flashprog_flag_set(flash, FLASHPROG_FLAG_NON_VOLATILE_WRSR, set && !volat1le);
+
+	if (get)
+		ret = config_get(flash, setting);
+
+	if (set)
+		ret = config_set(flash, setting, value);
+
+	flashprog_flash_release(flash);
+shutdown_ret:
+	flashprog_programmer_shutdown(prog);
+free_ret:
+	free(flash_args.chip);
+	free(flash_args.prog_args);
+	free(flash_args.prog_name);
+	free(log_args.logfile);
+	close_logfile();
+	return ret;
+}