vp6500mixer.c

/*
 * vp6500mixer - sound mixer utility für Philips VP6500 VoIP phone
 *
 * Copyright (C) 2010  Christian Garbs <mitch@cgarbs.de>
 * licensed under GNU GPL v2 or later
 *
 *    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.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>

#include "aic14_ioctl.h"

#define MAXLEVEL 255
#define AIC14_DEV "/dev/aic14"

static u_int8_t bytereg[4];

int main(int argc, char *argv[])
{
	int aic14_fd  = -1;
	int vol       = -1;

	bytereg[0]    = 0;
	bytereg[1]    = 0;
	bytereg[2]    = 0;
	bytereg[3]    = 0;

	if (argc == 2) {

		if (sscanf(argv[1], "%d", &vol) == 1) {
			
			if (vol < 0) {
				vol = 0;
			}
			if (vol > MAXLEVEL) {
				vol = MAXLEVEL;
			}

			if (! ((aic14_fd = open(AIC14_DEV, O_WRONLY)) < 0)) {
#ifdef DEBUG				
				if (ioctl(aic14_fd, AIC14_GET_DAC_GAIN, bytereg) == -1) {
					fprintf(stderr, "err: AIC14_GET_DAC_GAIN ioctl failed\n");
				} else {
					printf("DAC Gain before:  %8X (%5i dB)\n", bytereg[0], -42 + bytereg[0]);
				}
#endif				

				bytereg[0] = vol;
				if (ioctl(aic14_fd, AIC14_SET_DAC_GAIN, bytereg) == -1) {
					fprintf(stderr, "err: AIC14_SET_DAC_GAIN ioctl failed\n");
				}

#ifdef DEBUG				
				if (ioctl(aic14_fd, AIC14_GET_DAC_GAIN, bytereg) == -1) {
					fprintf(stderr, "err: AIC14_GET_DAC_GAIN ioctl failed\n");
				} else {
					printf("DAC Gain after:   %8X (%5i dB)\n", bytereg[0], -42 + bytereg[0]);
				}
#endif				

				close(aic14_fd);
			} else {
				perror("err: " AIC14_DEV " not opened");
			}
		} else {
			fprintf(stderr, "err: could not parse volume: <%s>\n", argv[1]);
		}
	} else {
		fprintf(stderr, "err: enter volume as first argument (range 0-255)\n");
	}

	return 0;
}