123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/* mixer_hw.c
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**
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** Copyright (c) 2019, The Linux Foundation. All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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** * Neither the name of The Linux Foundation nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <ctype.h>
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#include <poll.h>
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#include <sys/ioctl.h>
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#include <linux/ioctl.h>
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#include <sound/asound.h>
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#include "mixer_io.h"
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struct mixer_hw_data {
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unsigned int card;
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int fd;
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};
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static void mixer_hw_close(void *data)
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{
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struct mixer_hw_data *hw_data = data;
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if (!hw_data)
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return;
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if (hw_data->fd >= 0)
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close(hw_data->fd);
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hw_data->fd = -1;
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free(hw_data);
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hw_data = NULL;
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}
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static int mixer_hw_ioctl(void *data, unsigned int cmd, ...)
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{
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struct mixer_hw_data *hw_data = data;
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va_list ap;
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void *arg;
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va_start(ap, cmd);
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arg = va_arg(ap, void *);
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va_end(ap);
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return ioctl(hw_data->fd, cmd, arg);
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}
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static ssize_t mixer_hw_read_event(void *data, struct snd_ctl_event *ev,
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size_t size)
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{
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struct mixer_hw_data *hw_data = data;
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return read(hw_data->fd, ev, size);
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}
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static struct mixer_ops mixer_hw_ops = {
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.close = mixer_hw_close,
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.get_poll_fd = NULL,
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.read_event = mixer_hw_read_event,
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.ioctl = mixer_hw_ioctl,
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};
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int mixer_hw_open(unsigned int card, void **data,
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struct mixer_ops **ops)
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{
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struct mixer_hw_data *hw_data;
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int fd;
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char fn[256];
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snprintf(fn, sizeof(fn), "/dev/snd/controlC%u", card);
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fd = open(fn, O_RDWR);
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if (fd < 0)
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return fd;
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hw_data = calloc(1, sizeof(*hw_data));
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if (!hw_data) {
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close(fd);
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return -1;
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}
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hw_data->card = card;
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hw_data->fd = fd;
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*data = hw_data;
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*ops = &mixer_hw_ops;
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return fd;
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}
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