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/*
* Advanced Linux Sound Architecture Control Program - Export
* Copyright (c) by Jaroslav Kysela <perex@perex.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* Export variable syntax:
*
* For single card:
*
* ALSA_CARD_NUMBER=<number>
* ALSA_CARD_STATE=<state>
*
* For multiple cards:
*
* ALSA_CARD#_STATE=<state> # where # is replaced with the card number
*
* State list:
*
* active # card was initialized and active
* skip # card was skipped (other card in group)
* waiting # card is waiting for the initial configuration
*/
#include "aconfig.h"
#include "version.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "alsactl.h"
/* Global array to store card states (0 = active, 1 = waiting) */
static int export_card_state[32];
/**
* export_card_state_set - Set card state
* @card: Card number
* @state: Card state (0 = active, 1 = waiting)
*
* Returns 0 on success, negative error code on failure
*/
int export_card_state_set(int card, int state)
{
/* Check bounds */
if (card < 0 || (unsigned long)card >= ARRAY_SIZE(export_card_state))
return -EINVAL;
export_card_state[card] = state;
return 0;
}
/**
* export_card_state_print - Export and print card state information
* @iter: Card iterator containing current card information
*
* Prints key=value pairs based on iterator's single flag and export_card_state array.
* Returns 0 on success, negative error code on failure
*/
static int export_card_state_print(struct snd_card_iterator *iter)
{
const char *state;
int istate;
if (!iter)
return -EINVAL;
/* Check bounds */
if (iter->card < 0 || (unsigned long)iter->card >= ARRAY_SIZE(export_card_state))
return -EINVAL;
/* Determine state from export_card_state array */
istate = export_card_state[iter->card];
switch (istate) {
case CARD_STATE_WAIT: state = "waiting"; break;
case CARD_STATE_SKIP: state = "skip"; break;
default: state = "active"; break;
}
if (iter->single) {
/* Single card export format */
printf("ALSA_CARD_NUMBER=%d\n", iter->card);
printf("ALSA_CARD_STATE=%s\n", state);
} else {
/* Multiple cards export format */
printf("ALSA_CARD%d_STATE=%s\n", iter->card, state);
}
return 0;
}
/**
* export_cards - Export state for all cards
* @cardname: Card name or NULL for all cards
*
* Returns 0 on success, negative error code on failure
*/
int export_cards(const char *cardname)
{
struct snd_card_iterator iter;
const char *name;
int ret;
ret = snd_card_iterator_sinit(&iter, cardname);
if (ret < 0)
return ret;
while ((name = snd_card_iterator_next(&iter)) != NULL) {
ret = export_card_state_print(&iter);
if (ret < 0)
break;
}
if (ret == 0)
ret = snd_card_iterator_error(&iter);
return ret;
}
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