// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2019 MediaTek Inc.
 * Author: Michael Hsiao <michael.hsiao@mediatek.com>
 */

/*******************************************************************************
 *
 * Filename:
 * ---------
 *   mt_soc_pcm_I2S0dl1.c
 *
 * Project:
 * --------
 *    Audio Driver Kernel Function
 *
 * Description:
 * ------------
 *   Audio I2S0dl1 and Dl1 playback
 *
 * Author:
 * -------
 * Chipeng Chang
 *
 *------------------------------------------------------------------------------
 *
 *
 ******************************************************************************
 */

/*****************************************************************************
 *                     C O M P I L E R   F L A G S
 *****************************************************************************/

/*****************************************************************************
 *                E X T E R N A L   R E F E R E N C E S
 *****************************************************************************/

#include <linux/dma-mapping.h>
#include <sound/pcm_params.h>

#include "mtk-auddrv-afe.h"
#include "mtk-auddrv-ana.h"
#include "mtk-auddrv-clk.h"
#include "mtk-auddrv-common.h"
#include "mtk-auddrv-def.h"
#include "mtk-auddrv-kernel.h"
#include "mtk-soc-afe-control.h"
#include "mtk-soc-pcm-common.h"
#include "mtk-soc-pcm-platform.h"

static struct afe_mem_control_t *pI2S0dl1MemControl;
static struct snd_dma_buffer Dl1I2S0_Playback_dma_buf;
static unsigned int mPlaybackDramState;

static bool vcore_dvfs_enable;

/*
 *    function implementation
 */

static int mtk_I2S0dl1_probe(struct platform_device *pdev);
static int mtk_pcm_I2S0dl1_close(struct snd_pcm_substream *substream);
static int mtk_afe_I2S0dl1_component_probe(struct snd_soc_component *component);

static int mI2S0dl1_hdoutput_control;
static bool mPrepareDone;
static int mI2S0dl1_wgain;
static unsigned int m_hw_volume = 0x10000;

static const void *irq_user_id;
static unsigned int irq1_cnt;

static struct device *mDev;

const char *const I2S0dl1_HD_output[] = {"Off", "On"};
const char *const I2S0dl1_WGAIN[] = {"Off", "On"};

static const struct soc_enum Audio_I2S0dl1_Enum[] = {
	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(I2S0dl1_HD_output), I2S0dl1_HD_output),
	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(I2S0dl1_WGAIN), I2S0dl1_WGAIN),
};

static int Audio_I2S0dl1_hdoutput_Get(struct snd_kcontrol *kcontrol,
				      struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("Audio_AmpR_Get = %d\n", mI2S0dl1_hdoutput_control);
	ucontrol->value.integer.value[0] = mI2S0dl1_hdoutput_control;
	return 0;
}

static int Audio_I2S0dl1_hdoutput_Set(struct snd_kcontrol *kcontrol,
				      struct snd_ctl_elem_value *ucontrol)
{
	/* pr_debug("%s()\n", __func__); */
	if (ucontrol->value.enumerated.item[0] >
	    ARRAY_SIZE(I2S0dl1_HD_output)) {
		pr_warn("%s(), return -EINVAL\n", __func__);
		return -EINVAL;
	}

	mI2S0dl1_hdoutput_control = ucontrol->value.integer.value[0];

	if (GetMemoryPathEnable(Soc_Aud_Digital_Block_MEM_HDMI) == true) {
		pr_info("return HDMI enabled\n");
		return 0;
	}

	return 0;
}

static int Audio_Irqcnt1_Get(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	AudDrv_Clk_On();
	ucontrol->value.integer.value[0] = Afe_Get_Reg(AFE_IRQ_MCU_CNT1);
	AudDrv_Clk_Off();
	return 0;
}

static int Audio_Irqcnt1_Set(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("%s(), irq_user_id = %p, irq1_cnt = %d, value = %ld\n",
		 __func__, irq_user_id, irq1_cnt,
		 ucontrol->value.integer.value[0]);

	if (irq1_cnt == ucontrol->value.integer.value[0])
		return 0;

	irq1_cnt = ucontrol->value.integer.value[0];

	AudDrv_Clk_On();
	if (irq_user_id && irq1_cnt)
		irq_update_user(irq_user_id, Soc_Aud_IRQ_MCU_MODE_IRQ1_MCU_MODE,
				0, irq1_cnt);
	else
		pr_warn("warn, cannot update irq counter, user_id = %p, irq1_cnt = %d\n",
			irq_user_id, irq1_cnt);

	AudDrv_Clk_Off();
	return 0;
}

static int Audio_hwgain_Get(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("Audio_AmpR_Get = %d\n", mI2S0dl1_wgain);
	ucontrol->value.integer.value[0] = mI2S0dl1_wgain;
	return 0;
}

static int Audio_hwgain_Set(struct snd_kcontrol *kcontrol,
			     struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("%s()\n", __func__);
	if (ucontrol->value.enumerated.item[0] >
	    ARRAY_SIZE(I2S0dl1_WGAIN)) {
		pr_debug("%s(), return -EINVAL\n", __func__);
		return -EINVAL;
	}

	mI2S0dl1_wgain = ucontrol->value.integer.value[0];
	return 0;
}

static int Audio_hw_Volume_Get(struct snd_kcontrol *kcontrol,
				struct snd_ctl_elem_value *ucontrol)
{
	pr_debug("mfm_i2s_Volume = %d\n", m_hw_volume);
	ucontrol->value.integer.value[0] = m_hw_volume;
	return 0;
}

static int Audio_hw_Volume_Set(struct snd_kcontrol *kcontrol,
				struct snd_ctl_elem_value *ucontrol)
{
	m_hw_volume = ucontrol->value.integer.value[0];

	pr_debug("%s mfm_i2s_Volume = 0x%x\n", __func__, m_hw_volume);
	SetHwDigitalGain(Soc_Aud_Digital_Block_HW_GAIN1, m_hw_volume);

	return 0;
}

static const struct snd_kcontrol_new Audio_snd_I2S0dl1_controls[] = {
	SOC_ENUM_EXT("Audio_I2S0dl1_hd_Switch", Audio_I2S0dl1_Enum[0],
		     Audio_I2S0dl1_hdoutput_Get, Audio_I2S0dl1_hdoutput_Set),
	SOC_SINGLE_EXT("Audio IRQ1 CNT", SND_SOC_NOPM, 0, IRQ_MAX_RATE, 0,
		       Audio_Irqcnt1_Get, Audio_Irqcnt1_Set),
	SOC_ENUM_EXT("Audio_I2S0dl1_wgain", Audio_I2S0dl1_Enum[1],
		     Audio_hwgain_Get, Audio_hwgain_Set),
	SOC_SINGLE_EXT("Audio HW gain Volume", SND_SOC_NOPM, 0, 0x80000, 0,
			 Audio_hw_Volume_Get, Audio_hw_Volume_Set)
};

static struct snd_pcm_hardware mtk_I2S0dl1_hardware = {
	.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
		 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
		 SNDRV_PCM_INFO_MMAP_VALID),
	.formats = SND_SOC_ADV_MT_FMTS,
	.rates = SOC_HIGH_USE_RATE,
	.rate_min = SOC_HIGH_USE_RATE_MIN,
	.rate_max = SOC_HIGH_USE_RATE_MAX,
	.channels_min = SOC_NORMAL_USE_CHANNELS_MIN,
	.channels_max = SOC_NORMAL_USE_CHANNELS_MAX,
	.buffer_bytes_max = SOC_HIFI_BUFFER_SIZE,
	.period_bytes_max = SOC_HIFI_BUFFER_SIZE,
	.periods_min = SOC_NORMAL_USE_PERIODS_MIN,
	.periods_max = SOC_NORMAL_USE_PERIODS_MAX,
	.fifo_size = 0,
};

static int mtk_pcm_I2S0dl1_stop(struct snd_pcm_substream *substream)
{
	/* struct afe_block_t *Afe_Block = &(pI2S0dl1MemControl->rBlock); */

	pr_debug("%s\n", __func__);

	irq_user_id = NULL;
	irq_remove_substream_user(
		substream, irq_request_number(Soc_Aud_Digital_Block_MEM_DL1));

	SetMemoryPathEnable(Soc_Aud_Digital_Block_MEM_DL1, false);

	ClearMemBlock(Soc_Aud_Digital_Block_MEM_DL1);

	return 0;
}

static snd_pcm_uframes_t
mtk_pcm_I2S0dl1_pointer(struct snd_pcm_substream *substream)
{
	return get_mem_frame_index(substream, pI2S0dl1MemControl,
				   Soc_Aud_Digital_Block_MEM_DL1);
}

static int mtk_pcm_I2S0dl1_hw_params(struct snd_pcm_substream *substream,
				     struct snd_pcm_hw_params *hw_params)
{
	int ret = 0;

	substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
	if (substream->runtime->dma_bytes <= GetPLaybackSramFullSize() &&
	    !pI2S0dl1MemControl->mAssignDRAM &&
	    AllocateAudioSram(&substream->runtime->dma_addr,
			      &substream->runtime->dma_area,
			      substream->runtime->dma_bytes, substream,
			      params_format(hw_params), false) == 0) {
		SetHighAddr(Soc_Aud_Digital_Block_MEM_DL1, false,
			    substream->runtime->dma_addr);
	} else {
		pr_debug("%s(), use DRAM\n", __func__);
		substream->runtime->dma_area = Dl1I2S0_Playback_dma_buf.area;
		substream->runtime->dma_addr = Dl1I2S0_Playback_dma_buf.addr;
		SetHighAddr(Soc_Aud_Digital_Block_MEM_DL1, true,
			    substream->runtime->dma_addr);
		mPlaybackDramState = true;
		AudDrv_Emi_Clk_On();
	}

	set_mem_block(substream, hw_params, pI2S0dl1MemControl,
		      Soc_Aud_Digital_Block_MEM_DL1);

	pr_debug("dma_bytes = %zu dma_area = %p dma_addr = 0x%lx\n",
		substream->runtime->dma_bytes, substream->runtime->dma_area,
		(long)substream->runtime->dma_addr);

	return ret;
}

static int mtk_pcm_I2S0dl1_hw_free(struct snd_pcm_substream *substream)
{
	/* pr_debug("%s substream = %p\n", __func__, substream); */
	if (mPlaybackDramState == true) {
		AudDrv_Emi_Clk_Off();
		mPlaybackDramState = false;
	} else
		freeAudioSram((void *)substream);

	return 0;
}

static struct snd_pcm_hw_constraint_list constraints_sample_rates = {
	.count = ARRAY_SIZE(soc_high_supported_sample_rates),
	.list = soc_high_supported_sample_rates,
	/* TODO: KC: need check this!!!!!!!!!! */
	.mask = 0,
};

static int mtk_pcm_I2S0dl1_open(struct snd_pcm_substream *substream)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;

	mPlaybackDramState = false;

	pr_debug("%s: mtk_I2S0dl1_hardware.buffer_bytes_max = %zu mPlaybackDramState = %d\n",
		__func__, mtk_I2S0dl1_hardware.buffer_bytes_max,
		mPlaybackDramState);
	runtime->hw = mtk_I2S0dl1_hardware;

	AudDrv_Clk_On();

	memcpy((void *)(&(runtime->hw)), (void *)&mtk_I2S0dl1_hardware,
	       sizeof(struct snd_pcm_hardware));
	pI2S0dl1MemControl = Get_Mem_ControlT(Soc_Aud_Digital_Block_MEM_DL1);

	ret = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
					 &constraints_sample_rates);


	if (ret < 0) {
		pr_err("ret < 0 mtk_pcm_I2S0dl1_close\n");
		mtk_pcm_I2S0dl1_close(substream);
		return ret;
	}

	return 0;
}

static int mtk_pcm_I2S0dl1_close(struct snd_pcm_substream *substream)
{
	pr_debug("%s\n", __func__);

	if (is_irq_from_ext_module()) {
		ext_sync_signal_lock();
		ext_sync_signal_unlock();
	}

	if (mPrepareDone == true) {
		if (!mI2S0dl1_wgain) {
			SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S3);
			SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC);
			SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
		} else {
			SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_HW_GAIN1_OUT);
			SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S3);
			if (GetFmI2sInPathEnable() == false) {
				SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_HW_GAIN1_IN,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC);
				SetIntfConnection(Soc_Aud_InterCon_DisConnect,
					  Soc_Aud_AFE_IO_Block_HW_GAIN1_IN,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
			} else {
				pr_debug("%s bypass hw gain control when FM Enable(%d)\n",
				__func__, GetFmI2sInPathEnable());
			}
		}
		mI2S0dl1_wgain = 0;
		/* stop DAC output */
		SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_DAC, false);
		if (GetI2SDacEnable() == false)
			SetI2SDacEnable(false);
		/* stop I2S output */
		SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_2, false);

		if (GetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_2) ==
		    false)
			Afe_Set_Reg(AFE_I2S_CON3, 0x0, 0x1);

		RemoveMemifSubStream(Soc_Aud_Digital_Block_MEM_DL1, substream);

		if (mI2S0dl1_hdoutput_control == true) {
			pr_debug("%s(), mI2S0dl1_hdoutput_control = %d\n",
				__func__, mI2S0dl1_hdoutput_control);
			/* here to close APLL */
			if (!mtk_soc_always_hd) {
				DisableAPLLTunerbySampleRate(
					substream->runtime->rate);
				DisableALLbySampleRate(
					substream->runtime->rate);
			}

			EnableI2SCLKDiv(Soc_Aud_I2S1_MCKDIV, false);
			EnableI2SCLKDiv(Soc_Aud_I2S3_MCKDIV, false);
		}
		EnableAfe(false);
		mPrepareDone = false;
	}

	irq1_cnt = 0; /* reset irq1_cnt */

	AudDrv_Clk_Off();

	vcore_dvfs(&vcore_dvfs_enable, true);

	return 0;
}

static int mtk_pcm_I2S0dl1_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int u32AudioI2S = 0;
	bool mI2SWLen;

	pr_debug("%s: mPrepareDone = %d, format = %d, sample rate = %d\n",
		__func__, mPrepareDone, runtime->format,
		substream->runtime->rate);

	if (mPrepareDone == false) {
		SetMemifSubStream(Soc_Aud_Digital_Block_MEM_DL1, substream);

		if (runtime->format == SNDRV_PCM_FORMAT_S32_LE ||
		    runtime->format == SNDRV_PCM_FORMAT_U32_LE) {
			SetMemIfFetchFormatPerSample(
				Soc_Aud_Digital_Block_MEM_DL1,
				AFE_WLEN_32_BIT_ALIGN_8BIT_0_24BIT_DATA);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_24BIT,
					    Soc_Aud_AFE_IO_Block_I2S1_DAC);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_24BIT,
					    Soc_Aud_AFE_IO_Block_I2S3);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_24BIT,
					    Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
			mI2SWLen = Soc_Aud_I2S_WLEN_WLEN_32BITS;
		} else {
			SetMemIfFetchFormatPerSample(
				Soc_Aud_Digital_Block_MEM_DL1, AFE_WLEN_16_BIT);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_16BIT,
					    Soc_Aud_AFE_IO_Block_I2S1_DAC);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_16BIT,
					    Soc_Aud_AFE_IO_Block_I2S3);
			SetConnectionFormat(OUTPUT_DATA_FORMAT_16BIT,
					    Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
			mI2SWLen = Soc_Aud_I2S_WLEN_WLEN_16BITS;
		}
		if (!mI2S0dl1_wgain) {
			SetIntfConnection(Soc_Aud_InterCon_Connection,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S3);
			SetIntfConnection(Soc_Aud_InterCon_Connection,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC);
			SetIntfConnection(Soc_Aud_InterCon_Connection,
					  Soc_Aud_AFE_IO_Block_MEM_DL1,
					  Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
		} else {
			SetIntfConnection(Soc_Aud_InterCon_Connection,
				  Soc_Aud_AFE_IO_Block_MEM_DL1,
				  Soc_Aud_AFE_IO_Block_HW_GAIN1_OUT);
			SetIntfConnection(Soc_Aud_InterCon_Connection,
				  Soc_Aud_AFE_IO_Block_HW_GAIN1_IN,
				  Soc_Aud_AFE_IO_Block_I2S1_DAC);
			SetIntfConnection(Soc_Aud_InterCon_Connection,
				  Soc_Aud_AFE_IO_Block_HW_GAIN1_IN,
				  Soc_Aud_AFE_IO_Block_I2S1_DAC_2);
			SetIntfConnection(Soc_Aud_InterCon_Connection,
				  Soc_Aud_AFE_IO_Block_MEM_DL1,
				  Soc_Aud_AFE_IO_Block_I2S3);
			/* Set HW_GAIN */
			SetHwDigitalGainMode(Soc_Aud_Digital_Block_HW_GAIN1,
					     runtime->rate, 0x40);
			SetHwDigitalGainEnable(Soc_Aud_Digital_Block_HW_GAIN1,
					       true);
			SetHwDigitalGain(Soc_Aud_Digital_Block_HW_GAIN1,
					 m_hw_volume);
		}
		/* TODO: KC: use Set2ndI2SOut() to set i2s3 */
		/* I2S out Setting */
		u32AudioI2S =
			SampleRateTransform(runtime->rate,
					    Soc_Aud_Digital_Block_I2S_OUT_2)
			<< 8;
		u32AudioI2S |= Soc_Aud_I2S_FORMAT_I2S << 3; /* us3 I2s format */
		u32AudioI2S |= mI2SWLen << 1;

		if (mI2S0dl1_hdoutput_control == true) {
			pr_debug("%s mI2S0dl1_hdoutput_control == %d\n",
				__func__, mI2S0dl1_hdoutput_control);

			/* here to open APLL */
			if (!mtk_soc_always_hd) {
				EnableALLbySampleRate(runtime->rate);
				EnableAPLLTunerbySampleRate(runtime->rate);
			}

			SetCLkMclk(Soc_Aud_I2S1,
				   runtime->rate); /* select I2S */
			SetCLkMclk(Soc_Aud_I2S3, runtime->rate);

			EnableI2SCLKDiv(Soc_Aud_I2S1_MCKDIV, true);
			EnableI2SCLKDiv(Soc_Aud_I2S3_MCKDIV, true);

			u32AudioI2S |= Soc_Aud_LOW_JITTER_CLOCK
				       << 12; /* Low jitter mode */

		} else {
			u32AudioI2S &= ~(Soc_Aud_LOW_JITTER_CLOCK << 12);
		}

		if (GetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_2) ==
		    false) {
			SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_2,
					    true);

			Afe_Set_Reg(AFE_I2S_CON3, u32AudioI2S | 1,
				    AFE_MASK_ALL);
		} else {
			SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_2,
					    true);
		}

		/* start I2S DAC out */
		if (GetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_DAC) ==
		    false) {
			SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_DAC,
					    true);
			SetI2SDacOut(substream->runtime->rate,
				     mI2S0dl1_hdoutput_control, mI2SWLen);
			SetI2SDacEnable(true);
		} else {
			SetMemoryPathEnable(Soc_Aud_Digital_Block_I2S_OUT_DAC,
					    true);
		}

		EnableAfe(true);
		mPrepareDone = true;
	}
	return 0;
}

static int mtk_pcm_I2S0dl1_start(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	pr_debug("%s\n", __func__);

	/* here to set interrupt */
	irq_add_substream_user(
		substream, irq_request_number(Soc_Aud_Digital_Block_MEM_DL1),
		substream->runtime->rate,
		irq1_cnt ? irq1_cnt : substream->runtime->period_size);
	irq_user_id = substream;

	SetSampleRate(Soc_Aud_Digital_Block_MEM_DL1, runtime->rate);
	SetChannels(Soc_Aud_Digital_Block_MEM_DL1, runtime->channels);
	SetMemoryPathEnable(Soc_Aud_Digital_Block_MEM_DL1, true);

	EnableAfe(true);

	return 0;
}

static int mtk_pcm_I2S0dl1_trigger(struct snd_pcm_substream *substream, int cmd)
{

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		return mtk_pcm_I2S0dl1_start(substream);
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		return mtk_pcm_I2S0dl1_stop(substream);
	}
	return -EINVAL;
}

static int mtk_pcm_I2S0dl1_copy(struct snd_pcm_substream *substream,
				int channel, unsigned long pos,
				void __user *dst, unsigned long count)
{
	vcore_dvfs(&vcore_dvfs_enable, false);
	return mtk_memblk_copy(substream, channel, pos, dst, count,
			       pI2S0dl1MemControl,
			       Soc_Aud_Digital_Block_MEM_DL1);
}

static int mtk_pcm_I2S0dl1_silence(struct snd_pcm_substream *substream,
				   int channel,
				   unsigned long pos,
				   unsigned long bytes)
{
	return 0; /* do nothing */
}

static void *dummy_page[2];

static struct page *mtk_I2S0dl1_pcm_page(struct snd_pcm_substream *substream,
					 unsigned long offset)
{
	return virt_to_page(dummy_page[substream->stream]); /* the same page */
}

static struct snd_pcm_ops mtk_I2S0dl1_ops = {
	.open = mtk_pcm_I2S0dl1_open,
	.close = mtk_pcm_I2S0dl1_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = mtk_pcm_I2S0dl1_hw_params,
	.hw_free = mtk_pcm_I2S0dl1_hw_free,
	.prepare = mtk_pcm_I2S0dl1_prepare,
	.trigger = mtk_pcm_I2S0dl1_trigger,
	.pointer = mtk_pcm_I2S0dl1_pointer,
	.copy_user = mtk_pcm_I2S0dl1_copy,
	.fill_silence = mtk_pcm_I2S0dl1_silence,
	.page = mtk_I2S0dl1_pcm_page,
	.mmap = mtk_pcm_mmap,
};

static const struct snd_soc_component_driver mtk_I2S0dl1_soc_component = {
	.name = AFE_PCM_NAME,
	.ops = &mtk_I2S0dl1_ops,
	.probe = mtk_afe_I2S0dl1_component_probe,
};

static int mtk_I2S0dl1_probe(struct platform_device *pdev)
{
	pr_debug("%s\n", __func__);

	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
	if (!pdev->dev.dma_mask)
		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;

	if (pdev->dev.of_node)
		dev_set_name(&pdev->dev, "%s", MT_SOC_I2S0DL1_PCM);
	pdev->name = pdev->dev.kobj.name;

	pr_debug("%s: dev name %s\n", __func__, dev_name(&pdev->dev));

	mDev = &pdev->dev;

	return snd_soc_register_component(&pdev->dev,
					  &mtk_I2S0dl1_soc_component,
					  NULL,
					  0);
}

static int mtk_afe_I2S0dl1_component_probe(struct snd_soc_component *component)
{
	pr_debug("%s\n", __func__);
	snd_soc_add_component_controls(component, Audio_snd_I2S0dl1_controls,
				      ARRAY_SIZE(Audio_snd_I2S0dl1_controls));
	/* allocate dram */
	Dl1I2S0_Playback_dma_buf.area = dma_alloc_coherent(
		component->dev, SOC_HIFI_BUFFER_SIZE,
		&Dl1I2S0_Playback_dma_buf.addr, GFP_KERNEL | GFP_DMA);
	if (!Dl1I2S0_Playback_dma_buf.area)
		return -ENOMEM;

	Dl1I2S0_Playback_dma_buf.bytes = SOC_HIFI_BUFFER_SIZE;
	pr_debug("area = %p\n", Dl1I2S0_Playback_dma_buf.area);

	return 0;
}

static int mtk_I2S0dl1_remove(struct platform_device *pdev)
{
	snd_soc_unregister_component(&pdev->dev);
	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id mt_soc_pcm_dl1_i2s0Dl1_of_ids[] = {
	{
		.compatible = "mediatek,mt_soc_pcm_dl1_i2s0dl1",
	},
	{} };
#endif

static struct platform_driver mtk_I2S0dl1_driver = {
	.driver = {

			.name = MT_SOC_I2S0DL1_PCM,
			.owner = THIS_MODULE,
#ifdef CONFIG_OF
			.of_match_table = mt_soc_pcm_dl1_i2s0Dl1_of_ids,
#endif
		},
	.probe = mtk_I2S0dl1_probe,
	.remove = mtk_I2S0dl1_remove,
};

#ifndef CONFIG_OF
static struct platform_device *soc_mtkI2S0dl1_dev;
#endif

static int __init mtk_I2S0dl1_soc_platform_init(void)
{
	int ret;

	pr_debug("%s\n", __func__);
#ifndef CONFIG_OF
	soc_mtkI2S0dl1_dev = platform_device_alloc(MT_SOC_I2S0DL1_PCM, -1);
	if (!soc_mtkI2S0dl1_dev)
		return -ENOMEM;

	ret = platform_device_add(soc_mtkI2S0dl1_dev);
	if (ret != 0) {
		platform_device_put(soc_mtkI2S0dl1_dev);
		return ret;
	}
#endif

	ret = platform_driver_register(&mtk_I2S0dl1_driver);

	return ret;
}
module_init(mtk_I2S0dl1_soc_platform_init);

static void __exit mtk_I2S0dl1_soc_platform_exit(void)
{
	platform_driver_unregister(&mtk_I2S0dl1_driver);
}
module_exit(mtk_I2S0dl1_soc_platform_exit);

MODULE_DESCRIPTION("AFE PCM module platform driver");
MODULE_LICENSE("GPL");