/* Copyright 2007 Red Hat, Inc.
*
* Portions extraced from various ALSA code:
* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
* Jaroslav Kysela <perex@suse.cz>
*
* This software may be freely redistributed under the terms of the GNU
* public license.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <alsa/asoundlib.h>
#define ALSA_CONFIG_PATH "/etc/alsa/asound.state"
#define ALL_CARDS (-1)
int get_card_number()
{
char *devname, *action;
action = getenv("ACTION");
if (!action || strcmp(action, "add"))
return -1;
devname = getenv("DEVNAME");
if (!devname)
return -1;
if (!strncmp(devname, "/dev/snd/controlC", 17))
return atoi(devname + 17);
if (!strncmp(devname, "/dev/snd/pcmC", 13))
return atoi(devname + 13);
return -1;
}
int has_config(int index)
{
int rc = 0;
snd_config_t *config, *control;
snd_input_t *in;
snd_ctl_t *handle;
snd_ctl_card_info_t *info;
const char *id;
char path[32];
rc = snd_config_top(&config);
if (rc < 0)
goto out;
rc = snd_input_stdio_open(&in, ALSA_CONFIG_PATH, "r");
if (rc >= 0) {
rc = snd_config_load(config, in);
snd_input_close(in);
if (rc < 0)
goto out;
}
sprintf(path, "hw:%d", index);
rc = snd_ctl_open(&handle, path, 0);
if (rc < 0)
goto out;
snd_ctl_card_info_alloca(&info);
rc = snd_ctl_card_info(handle, info);
if (rc < 0)
goto out_close;
id = snd_ctl_card_info_get_id(info);
rc = snd_config_searchv(config, &control, "state", id, "control", 0);
out_close:
snd_ctl_close(handle);
out:
return !rc;
}
void load_volume_settings(int index)
{
char *args[] = { "/sbin/alsactl", "-f", ALSA_CONFIG_PATH, "restore", NULL, NULL };
char num[10];
if(index != ALL_CARDS) {
snprintf(num, 10, "%d", index);
args[4] = num;
}
execv(args[0], args);
}
void save_volume_settings(int index)
{
char *args[] = { "/sbin/alsactl", "-f", ALSA_CONFIG_PATH, "store", NULL, NULL };
char num[10];
if(index != ALL_CARDS) {
snprintf(num, 10, "%d", index);
args[4] = num;
}
execv(args[0], args);
}
void frob_mixer(int index)
{
char tmp[100];
snprintf(tmp, 100, "%d", index);
tmp[99] = '\0';
execl("/bin/alsaunmute","/bin/alsaunmute", tmp, "-v", NULL);
}
void banner(void)
{
printf("ALSA volume settings handler, Copyright 2007 Red Hat, Inc.\n");
printf("This software may be freely redistributed under\nthe terms of the GNU public license.\n\n");
printf("Usage: salsa [options] [card number]\n\n");
printf(" Options:\n");
printf(" -l - Load volume settings\n");
printf(" -s - Save volume settings\n\n");
printf(" Card number:\n");
printf(" ## - An affected card. If it isn't specified,\n");
printf(" configure all installed sound cards.\n\n");
exit(0);
}
int main(int argc, char **argv)
{
int i;
if(argc == 1) {
i = get_card_number();
if (i < 0) {
return 0;
}
if (has_config(i)) {
load_volume_settings(i);
}
else {
frob_mixer(i);
}
}
else if(argc >= 2) {
int card_number = ALL_CARDS;
if(argc == 3) {
card_number = atoi(argv[2]);
}
if(argv[1][1] == 'l') {
load_volume_settings(card_number);
}
else if(argv[1][1] == 's') {
save_volume_settings(card_number);
}
else {
banner();
}
}
return(0);
}