sound/caph_hawaii/audio_driver/voif_handler.c

/****************************************************************************
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 Unless you and Broadcom execute a separate written software license agreement
 governing use of this software, this software is licensed to you under the
 terms of the GNU General Public License version 2 (the GPL), available at
    http://www.broadcom.com/licenses/GPLv2.php

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 As a special exception, the copyright holders of this software give you
 permission to link this software with independent modules, and to copy and
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 Notwithstanding the above, under no circumstances may you combine this software
 in any way with any other Broadcom software provided under a license other than
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***************************************************************************/
/**
*
*   @file   voif_handler.c
*
*   @brief  PCM data interface to DSP.
*           It is used to hook with customer's downlink voice processing
*			module. Customer will implement this.
*
****************************************************************************/
#include <linux/string.h>

#include "mobcom_types.h"
#include "audio_consts.h"
#include "voif_handler.h"
#include "audio_ddriver.h"
#include "audio_trace.h"

/* APIs */

#ifndef CONFIG_ENABLE_VOIF
static int voifDelay; /* init to 0 */
static int voifGain = 0x4000; /* In Q14 format, 0x4000 in Q14 == 1.0 */
#endif
static void *drv_handle; /* init to NULL */

static void VOIF_CB_Fxn(
	Int16 *ulData,
	Int16 *dlData,
	UInt32 sampleCount,
	UInt8 isCall16K)
{

#ifdef CONFIG_ENABLE_VOIF

/* The flag "CONFIG_ENABLE_VOIF" will be enabled by customer.
  custormer will hook
up their voice solution in callback */

#else

	if (voifDelay == 0) {
		/* copy ulData to dlData without delay, hear own voice lpbk. */
		memcpy(dlData, ulData, sampleCount * sizeof(Int16));
	} else if (voifDelay == 1) {
		Int32 t, i;
		/* Gain test, change gain of downlink, should hear volume
		difference */
		for (i = 0; i < sampleCount; i++) {
			t = (Int32) *dlData;
			t = (t * voifGain)>>14;
			*dlData++ = (Int16)(t&0xffff);
		}
	} else {
		/* delay test, mute the downlink */
		memset(dlData, 0, sampleCount * sizeof(Int16));
	}

#endif
	return;
}

/* Start voif */
void VoIF_init(AudioMode_t mode)
{
	drv_handle = AUDIO_DRIVER_Open(AUDIO_DRIVER_VOIF);
	AUDIO_DRIVER_Ctrl(drv_handle,
					AUDIO_DRIVER_SET_VOIF_CB,
					(void *)VOIF_CB_Fxn);
	AUDIO_DRIVER_Ctrl(drv_handle, AUDIO_DRIVER_START, NULL);
	return;
}

void VoIF_Deinit()
{
	AUDIO_DRIVER_Ctrl(drv_handle, AUDIO_DRIVER_STOP, NULL);
	AUDIO_DRIVER_Close(drv_handle);
	drv_handle = NULL;

	return;
}

#ifndef CONFIG_ENABLE_VOIF
void VoIF_SetDelay(int delay)
{
	voifDelay = delay;
}

void VoIF_SetGain(int gain)
{
	voifGain = gain;
}
#endif