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/*
* Hardware dependent Interface - main file for hardware access
* Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz>
*
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "hwdep_local.h"
#ifndef PIC
/* entry for static linking */
const char *_snd_module_hwdep_hw = "";
#endif
#define SNDRV_FILE_HWDEP ALSA_DEVICE_DIRECTORY "hwC%iD%i"
#define SNDRV_HWDEP_VERSION_MAX SNDRV_PROTOCOL_VERSION(1, 0, 1)
static int snd_hwdep_hw_close(snd_hwdep_t *hwdep)
{
int res;
assert(hwdep);
res = close(hwdep->poll_fd) < 0 ? -errno : 0;
return res;
}
static int snd_hwdep_hw_nonblock(snd_hwdep_t *hwdep, int nonblock)
{
long flags;
assert(hwdep);
if ((flags = fcntl(hwdep->poll_fd, F_GETFL)) < 0)
return -errno;
if (nonblock)
flags |= O_NONBLOCK;
else
flags &= ~O_NONBLOCK;
if (fcntl(hwdep->poll_fd, F_SETFL, flags) < 0)
return -errno;
return 0;
}
static int snd_hwdep_hw_info(snd_hwdep_t *hwdep, snd_hwdep_info_t *info)
{
assert(hwdep && info);
if (ioctl(hwdep->poll_fd, SNDRV_HWDEP_IOCTL_INFO, info) < 0)
return -errno;
return 0;
}
static int snd_hwdep_hw_ioctl(snd_hwdep_t *hwdep, unsigned int request, void * arg)
{
assert(hwdep);
if (ioctl(hwdep->poll_fd, request, arg) < 0)
return -errno;
return 0;
}
static ssize_t snd_hwdep_hw_write(snd_hwdep_t *hwdep, const void *buffer, size_t size)
{
ssize_t result;
assert(hwdep && (buffer || size == 0));
result = write(hwdep->poll_fd, buffer, size);
if (result < 0)
return -errno;
return result;
}
static ssize_t snd_hwdep_hw_read(snd_hwdep_t *hwdep, void *buffer, size_t size)
{
ssize_t result;
assert(hwdep && (buffer || size == 0));
result = read(hwdep->poll_fd, buffer, size);
if (result < 0)
return -errno;
return result;
}
static const snd_hwdep_ops_t snd_hwdep_hw_ops = {
.close = snd_hwdep_hw_close,
.nonblock = snd_hwdep_hw_nonblock,
.info = snd_hwdep_hw_info,
.ioctl = snd_hwdep_hw_ioctl,
.write = snd_hwdep_hw_write,
.read = snd_hwdep_hw_read,
};
int snd_hwdep_hw_open(snd_hwdep_t **handle, const char *name, int card, int device, int mode)
{
int fd, ver, ret;
char filename[sizeof(SNDRV_FILE_HWDEP) + 20];
snd_hwdep_t *hwdep;
assert(handle);
*handle = NULL;
if (card < 0 || card >= 32)
return -EINVAL;
sprintf(filename, SNDRV_FILE_HWDEP, card, device);
fd = snd_open_device(filename, mode);
if (fd < 0) {
snd_card_load(card);
fd = snd_open_device(filename, mode);
if (fd < 0)
return -errno;
}
#if 0
/*
* this is bogus, an application have to care about open filedescriptors
*/
if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) {
SYSERR("fcntl FD_CLOEXEC failed");
ret = -errno;
close(fd);
return ret;
}
#endif
if (ioctl(fd, SNDRV_HWDEP_IOCTL_PVERSION, &ver) < 0) {
ret = -errno;
close(fd);
return ret;
}
if (SNDRV_PROTOCOL_INCOMPATIBLE(ver, SNDRV_HWDEP_VERSION_MAX)) {
close(fd);
return -SND_ERROR_INCOMPATIBLE_VERSION;
}
hwdep = (snd_hwdep_t *) calloc(1, sizeof(snd_hwdep_t));
if (hwdep == NULL) {
close(fd);
return -ENOMEM;
}
hwdep->name = strdup(name);
hwdep->poll_fd = fd;
hwdep->mode = mode;
hwdep->type = SND_HWDEP_TYPE_HW;
hwdep->ops = &snd_hwdep_hw_ops;
*handle = hwdep;
return 0;
}
int _snd_hwdep_hw_open(snd_hwdep_t **hwdep, char *name,
snd_config_t *root ATTRIBUTE_UNUSED,
snd_config_t *conf, int mode)
{
snd_config_iterator_t i, next;
long card = -1, device = 0;
const char *str;
int err;
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "comment") == 0)
continue;
if (strcmp(id, "type") == 0)
continue;
if (strcmp(id, "card") == 0) {
err = snd_config_get_integer(n, &card);
if (err < 0) {
err = snd_config_get_string(n, &str);
if (err < 0)
return -EINVAL;
card = snd_card_get_index(str);
if (card < 0)
return card;
}
continue;
}
if (strcmp(id, "device") == 0) {
err = snd_config_get_integer(n, &device);
if (err < 0)
return err;
continue;
}
SNDERR("Unexpected field %s", id);
return -EINVAL;
}
if (card < 0)
return -EINVAL;
return snd_hwdep_hw_open(hwdep, name, card, device, mode);
}
SND_DLSYM_BUILD_VERSION(_snd_hwdep_hw_open, SND_HWDEP_DLSYM_VERSION);
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