/*
 * Copyright 2017 Dominic Spill <dominicgs@gmail.com>
 *
 * This file is part of HackRF.
 *
 * 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, 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include <hackrf.h>

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#ifndef bool
typedef int bool;
#define true 1
#define false 0
#endif

#define CLOCK_UNDEFINED 0xFF
#define REGISTER_INVALID 32767

int parse_int(char* s, uint8_t* const value) {
	uint_fast8_t base = 10;
	char* s_end;
	long long_value;

	if( strlen(s) > 2 ) {
		if( s[0] == '0' ) {
			if( (s[1] == 'x') || (s[1] == 'X') ) {
				base = 16;
				s += 2;
			} else if( (s[1] == 'b') || (s[1] == 'B') ) {
				base = 2;
				s += 2;
			}
		}
	}

	s_end = s;
	long_value = strtol(s, &s_end, base);
	if( (s != s_end) && (*s_end == 0) ) {
		*value = (uint8_t)long_value;
		return HACKRF_SUCCESS;
	} else {
		return HACKRF_ERROR_INVALID_PARAM;
	}
}

int si5351c_read_register(hackrf_device* device, const uint16_t register_number) {
	uint16_t register_value;
	int result = hackrf_si5351c_read(device, register_number, &register_value);
	
	if( result == HACKRF_SUCCESS ) {
		printf("[%3d] -> 0x%02x\n", register_number, register_value);
	} else {
		printf("hackrf_si5351c_read() failed: %s (%d)\n", hackrf_error_name(result), result);
	}
	
	return result;
}

int si5351c_write_register(
	hackrf_device* device,
	const uint16_t register_number,
	const uint16_t register_value
) {
	int result = HACKRF_SUCCESS;
	result = hackrf_si5351c_write(device, register_number, register_value);
	
	if( result == HACKRF_SUCCESS ) {
		printf("0x%2x -> [%3d]\n", register_value, register_number);
	} else {
		printf("hackrf_max2837_write() failed: %s (%d)\n", hackrf_error_name(result), result);
	}
	
	return result;
}

#define SI5351C_CLK_POWERDOWN (1<<7)
#define SI5351C_CLK_INT_MODE  (1<<6)
#define SI5351C_CLK_PLL_SRC   (1<<5)
#define SI5351C_CLK_INV       (1<<4)
#define SI5351C_CLK_SRC_XTAL            0
#define SI5351C_CLK_SRC_CLKIN           1
#define SI5351C_CLK_SRC_MULTISYNTH_0_4  2
#define SI5351C_CLK_SRC_MULTISYNTH_SELF 3

void print_clk_control(uint16_t clk_ctrl) {
	uint8_t clk_src, clk_pwr;
	printf("\tclock control = ");
	if(clk_ctrl & SI5351C_CLK_POWERDOWN)
		printf("Down, ");
	else
		printf("Up, ");
	if(clk_ctrl & SI5351C_CLK_INT_MODE)
		printf("Int Mode, ");
	else
		printf("Frac Mode, ");
	if(clk_ctrl & SI5351C_CLK_PLL_SRC)
		printf("PLL src B, ");
	else
		printf("PLL src A, ");
	if(clk_ctrl & SI5351C_CLK_INV)
		printf("Inverted, ");
	clk_src = (clk_ctrl >> 2) & 0x3;
	switch (clk_src) {
		case 0:
			printf("XTAL, ");
			break;
		case 1:
			printf("CLKIN, ");
			break;
		case 2:
			printf("MULTISYNTH 0 4, ");
			break;
		case 3:
			printf("MULTISYNTH SELF, ");
			break;
	}
	clk_pwr = clk_ctrl & 0x3;
	switch (clk_pwr) {
		case 0:
			printf("2 mA\n");
			break;
		case 1:
			printf("4 mA\n");
			break;
		case 2:
			printf("6 mA\n");
			break;
		case 3:
			printf("8 mA\n");
			break;
	}
}

int si5351c_read_multisynth_config(hackrf_device* device, const uint_fast8_t ms_number) {
	uint_fast8_t i, reg_base, reg_number;
	uint16_t parameters[8], clk_control;
	uint32_t p1,p2,p3,r_div;
	uint_fast8_t div_lut[] = {1,2,4,8,16,32,64,128};
	int result;

	printf("MS%d:\n", ms_number);
	result = hackrf_si5351c_read(device, 16+ms_number, &clk_control);
	if( result != HACKRF_SUCCESS ) {
		return result;
	}
	print_clk_control(clk_control);
	if(ms_number <6){
		reg_base = 42 + (ms_number * 8);
		for(i=0; i<8; i++) {
			reg_number = reg_base + i;
			result = hackrf_si5351c_read(device, reg_number, &parameters[i]);
			if( result != HACKRF_SUCCESS ) {
				return result;
			}
		}

		p1 = ((parameters[2] & 0x03) << 16)
			| (parameters[3] << 8)
			| parameters[4];
		p2 = ((parameters[5] & 0x0F) << 16)
			| (parameters[6] << 8)
			| parameters[7];
		p3 = ((parameters[5] & 0xF0) << 12)
			| (parameters[0] << 8)
			|  parameters[1];
		r_div = (parameters[2] >> 4) & 0x7;

		printf("\tp1 = %u\n", p1);
		printf("\tp2 = %u\n", p2);
		printf("\tp3 = %u\n", p3);
		if(p3)
			printf("\tOutput (800Mhz PLL): %#.10f Mhz\n", ((double)800 / (double)(((double)p1*p3 + p2 + 512*p3)/(double)(128*p3))) / div_lut[r_div] );
	} else {
		// MS6 and 7 are integer only
		unsigned int parms;
		reg_base = 90;

		for(i=0; i<3; i++) {
			uint_fast8_t reg_number = reg_base + i;
			int result = hackrf_si5351c_read(device, reg_number, &parameters[i]);
			if( result != HACKRF_SUCCESS ) {
				return result;
			}
		}
		r_div = (ms_number == 6) ? parameters[2] & 0x7 : (parameters[2] & 0x70) >> 4 ;
		parms = (ms_number == 6) ? parameters[0] : parameters[1];
		printf("\tp1_int = %u\n", parms);
		if(parms)
			printf("\tOutput (800Mhz PLL): %#.10f Mhz\n", (800.0f / parms) / div_lut[r_div] );
	}
	printf("\toutput divider = %u\n", div_lut[r_div]);
	return HACKRF_SUCCESS;
}

int si5351c_read_configuration(hackrf_device* device) {
	uint_fast8_t ms_number;
	int result;
			
	for(ms_number=0; ms_number<8; ms_number++) {
		result = si5351c_read_multisynth_config(device, ms_number);
		if( result != HACKRF_SUCCESS ) {
			return result;
		}
	}
	return HACKRF_SUCCESS;
}

static void usage() {
	printf("hackrf_clock - HackRF clock configuration utility\n");
	printf("Usage:\n");
	printf("\t-h, --help: this help\n");
	printf("\t-r, --read <clock_num>: read settings for clock_num\n");
	printf("\t-a, --all: read settings for all clocks\n");
	printf("\t-o, --clkout <clkout_enable>: enable/disable CLKOUT\n");
	printf("\t-d, --device <serial_number>: Serial number of desired HackRF.\n");
	printf("\nExamples:\n");
	printf("\thackrf_clock -r 3 : prints settings for CLKOUT\n");
}

static struct option long_options[] = {
	{ "help", no_argument, 0, 'h' },
	{ "read", required_argument, 0, 'r' },
	{ "all", no_argument, 0, 'a' },
	{ "clkout", required_argument, 0, 'o' },
	{ "device", required_argument, 0, 'd' },
	{ 0, 0, 0, 0 },
};

int main(int argc, char** argv) {
	hackrf_device* device = NULL;
	int opt, option_index = 0;
	bool read = false;
	uint8_t clock = CLOCK_UNDEFINED;
	bool clkout = false;
	uint8_t clkout_enable;
	const char* serial_number = NULL;

	int result = hackrf_init();
	if(result) {
		printf("hackrf_init() failed: %s (%d)\n", hackrf_error_name(result), result);
		return EXIT_FAILURE;
	}

	while( (opt = getopt_long(argc, argv, "r:ao:d:h?", long_options, &option_index)) != EOF ) {
		switch( opt ) {
		case 'r':
			read = true;
			result = parse_int(optarg, &clock);
			break;

		case 'a':
			read = true;
			break;

		case 'o':
			clkout = true;
			result = parse_int(optarg, &clkout_enable);
			break;

		case 'd':
			serial_number = optarg;
			break;

		case 'h':
		case '?':
			usage();
			return EXIT_SUCCESS;
		default:
			fprintf(stderr, "unknown argument '-%c %s'\n", opt, optarg);
			usage();
			return EXIT_FAILURE;
		}

		if(result != HACKRF_SUCCESS) {
			printf("argument error: %s (%d)\n", hackrf_error_name(result), result);
			usage();
			return EXIT_FAILURE;
		}
	}

	if(!clkout && !read) {
		fprintf(stderr, "Either read or enable CLKOUT option must be specified.\n");
		usage();
		return EXIT_FAILURE;
	}

	result = hackrf_open_by_serial(serial_number, &device);
	if(result) {
		printf("hackrf_open() failed: %s (%d)\n", hackrf_error_name(result), result);
		return EXIT_FAILURE;
	}

	if(clkout) {
		result = hackrf_set_clkout_enable(device, clkout_enable);
		if(result) {
			printf("hackrf_set_clkout_enable() failed: %s (%d)\n", hackrf_error_name(result), result);
			return EXIT_FAILURE;
		}
	}

	if(read) {
		if(clock == CLOCK_UNDEFINED)
			si5351c_read_configuration(device);
		else {
			printf("%d\n", clock);
			si5351c_read_multisynth_config(device, clock);
		}
	}

	result = hackrf_close(device);
	if(result) {
		printf("hackrf_close() failed: %s (%d)\n", hackrf_error_name(result), result);
		return EXIT_FAILURE;
	}

	hackrf_exit();
    return EXIT_SUCCESS;
}
