alsa-utils/alsactl/power.c

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/*
* Advanced Linux Sound Architecture Control Program
* Copyright (c) Jaroslav Kysela <perex@suse.cz>
*
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "aconfig.h"
#include "version.h"
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <alsa/asoundlib.h>
#include "alsactl.h"
static int get_int_state(const char *str)
{
if (!strcasecmp(str, "on"))
return SND_CTL_POWER_D0;
if (!strcasecmp(str, "off"))
return SND_CTL_POWER_D3hot;
if (*str == 'D' || *str == 'd') {
str++;
if (!strcmp(str, "0"))
return SND_CTL_POWER_D0;
if (!strcmp(str, "1"))
return SND_CTL_POWER_D1;
if (!strcmp(str, "2"))
return SND_CTL_POWER_D2;
if (!strcmp(str, "3"))
return SND_CTL_POWER_D3;
if (!strcmp(str, "3hot"))
return SND_CTL_POWER_D3hot;
if (!strcmp(str, "3cold"))
return SND_CTL_POWER_D3cold;
}
return -1;
}
static const char *get_str_state(int power_state)
{
static char str[16];
switch (power_state) {
case SND_CTL_POWER_D0:
return "D0";
case SND_CTL_POWER_D1:
return "D1";
case SND_CTL_POWER_D2:
return "D2";
// return SND_CTL_POWER_D3; /* it's same as D3hot */
case SND_CTL_POWER_D3hot:
return "D3hot";
case SND_CTL_POWER_D3cold:
return "D3cold";
default:
sprintf(str, "???0x%x", power_state);
return str;
}
}
static int show_power(int cardno)
{
snd_ctl_t *handle;
char name[16];
unsigned int power_state;
int err;
sprintf(name, "hw:%d", cardno);
err = snd_ctl_open(&handle, name, 0);
if (err < 0) {
error("snd_ctl_open error: %s", snd_strerror(err));
return err;
}
err = snd_ctl_get_power_state(handle, &power_state);
if (err < 0) {
error("snd_ctl_get_power_state error: %s", snd_strerror(err));
snd_ctl_close(handle);
return err;
}
snd_ctl_close(handle);
printf("Power state for card #%d is %s\n", cardno, get_str_state(power_state));
return 0;
}
static int set_power(int cardno, unsigned int power_state)
{
snd_ctl_t *handle;
char name[16];
int err;
sprintf(name, "hw:%d", cardno);
err = snd_ctl_open(&handle, name, 0);
if (err < 0) {
error("snd_ctl_open error: %s", snd_strerror(err));
return err;
}
err = snd_ctl_set_power_state(handle, power_state);
if (err < 0) {
error("snd_ctl_set_power_state error: %s", snd_strerror(err));
snd_ctl_close(handle);
return err;
}
err = snd_ctl_get_power_state(handle, &power_state);
if (err < 0) {
error("snd_ctl_get_power_state error: %s", snd_strerror(err));
snd_ctl_close(handle);
return err;
}
snd_ctl_close(handle);
printf("Power state for card #%d is %s\n", cardno, get_str_state(power_state));
return 0;
}
int power(const char *argv[], int argc)
{
int power_state, err;
if (argc == 0) { /* show status only */
int card, first = 1;
card = -1;
/* find each installed soundcards */
while (1) {
if (snd_card_next(&card) < 0)
break;
if (card < 0) {
if (first) {
error("No soundcards found...");
return -ENODEV;
}
break;
}
first = 0;
if ((err = show_power(card)) < 0)
return err;
}
return 0;
}
power_state = get_int_state(argv[0]);
if (power_state >= 0) {
int card, first = 1;
card = -1;
/* find each installed soundcards */
while (1) {
if (snd_card_next(&card) < 0)
break;
if (card < 0) {
if (first) {
error("No soundcards found...");
return -ENODEV;
}
break;
}
first = 0;
if ((err = set_power(card, power_state)))
return err;
}
} else {
int cardno;
cardno = snd_card_get_index(argv[0]);
if (cardno < 0) {
error("Cannot find soundcard '%s'...", argv[0]);
return -ENODEV;
}
if (argc > 1) {
power_state = get_int_state(argv[1]);
if (power_state < 0) {
error("Invalid power state '%s'...", argv[1]);
return -EINVAL;
}
if ((err = set_power(cardno, power_state)) < 0)
return err;
} else {
if ((err = show_power(cardno)) < 0)
return err;
}
}
return 0;
}