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/*
* Copyright (C) 2016 "IoT.bzh"
* Author Fulup Ar Foll <fulup@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* AfbCallBack (snd_ctl_hal_t *handle, int numid, void **response);
* AfbHalInit is mandatory and called with numid=0
*
* Syntax in .asoundrc file
* CrlLabel { cb MyFunctionName name "My_Second_Control" }
*
* Testing:
* amixer -Dagl_hal controls
* amixer -Dagl_hal cget name=My_Sample_Callback
*/
#include "AlsaHalPlug.h"
#include <stdio.h>
int AfbHalInitCB(void *handle, snd_ctl_action_t action, int numid, void*response) {
snd_ctl_hal_t *plughandle = (snd_ctl_hal_t*) handle;
fprintf(stdout, "\n - CB AfbHalInit devid=%s\n", plughandle->devid);
return 0;
}
int AfbHalSampleCB(void *handle, snd_ctl_action_t action, snd_ctl_ext_key_t key, void*response) {
switch (action) {
case CTLCB_GET_ATTRIBUTE:
{
fprintf(stdout, " - AfbHalSampleCB CTLCB_GET_ATTRIBUTE numid=%d\n", (int) key + 1);
snd_ctl_get_attrib_t *item = (snd_ctl_get_attrib_t*) response;
item->type = 1;
item->count = 2;
item->acc = SND_CTL_EXT_ACCESS_READWRITE;
break;
}
case CTLCB_GET_INTEGER_INFO:
{
fprintf(stdout, " - AfbHalSampleCB CTLCB_GET_INTEGER_INFO numid=%d\n", (int) key + 1);
snd_ctl_get_int_info_t *item = (snd_ctl_get_attrib_t*) response;
item->istep = 10;
item->imin = 20;
item->imax = 200;
break;
}
default:
fprintf(stdout, "CB AfbHalSampleCB unsupported action=%d numid=%d\n", action, (int) key + 1);
}
return 0;
}
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