asoc/codecs/rt5514-spi.c

/*
 * rt5514-spi.c  --  RT5514 SPI driver
 *
 * Copyright 2015 Realtek Semiconductor Corp.
 * Author: Oder Chiou <oder_chiou@realtek.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/input.h>
#include <linux/spi/spi.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_qos.h>
#include <linux/sysfs.h>
#include <linux/clk.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <linux/of_gpio.h>

#include "rt5514-spi.h"

static struct spi_device *rt5514_spi;
unsigned int rt5514_stream_flag = RT5514_DSP_NO_STREAM;
EXPORT_SYMBOL_GPL(rt5514_stream_flag);

struct rt5514_dsp {
	struct device *dev;
	struct delayed_work copy_work_0, copy_work_1, start_work;
	struct delayed_work irq_work;
	struct mutex dma_lock;
	struct snd_pcm_substream *substream[2];
	unsigned int buf_base[2], buf_limit[2], buf_rp[2], buf_rp_addr[2];
	unsigned int stream_flag[2];
	unsigned int hotword_ignore_ms, musdet_ignore_ms;
	size_t buf_size[2], get_size[2], dma_offset[2];
	struct wakeup_source ws;
	struct mutex count_lock;
	int wake_count;
};

static const struct snd_pcm_hardware rt5514_spi_pcm_hardware = {
	.info			= SNDRV_PCM_INFO_MMAP |
				  SNDRV_PCM_INFO_MMAP_VALID |
				  SNDRV_PCM_INFO_INTERLEAVED,
	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
	.period_bytes_min	= PAGE_SIZE,
	.period_bytes_max	= 0x20000 / 8,
	.periods_min		= 8,
	.periods_max		= 8,
	.channels_min		= 1,
	.channels_max		= 1,
	.buffer_bytes_max	= 0x20000,
};

static struct snd_soc_dapm_widget rt5514_spi_dapm_widgets[] = {
	/* Stream widgets */
	SND_SOC_DAPM_AIF_OUT("AIF_SPI_FE", "SoundTrigger Capture", 0, 0, 0, 0),
	SND_SOC_DAPM_AIF_IN("AIF_SPI_BE", "SPI Capture", 0, 0, 0, 0),
	SND_SOC_DAPM_INPUT("DSP_IN"),
};

static const struct snd_soc_dapm_route intercon_common[] = {
	{"AIF_SPI_FE", NULL, "AIF_SPI_BE"},
	{"SoundTrigger Capture", NULL, "AIF_SPI_FE"},
	{"AIF_SPI_BE", NULL, "DSP_IN"},
	{"AIF_SPI_BE", NULL, "SPI Capture"},
};

static int rt5514_spi_add_route(struct snd_soc_dai *dai)
{
	struct snd_soc_dapm_context *dapm;

	if (!dai) {
		pr_err("%s: Invalid params dai\n", __func__);
		return -EINVAL;
	}

	if (!dai->driver) {
		pr_err("%s: Invalid params dai driver\n", __func__);
		return -EINVAL;
	}

	dapm = snd_soc_component_get_dapm(dai->component);
	if (!dai || !dai->driver) {
		pr_err("%s Invalid params\n", __func__);
		return -EINVAL;
	}

	snd_soc_dapm_new_controls(dapm, rt5514_spi_dapm_widgets,
			ARRAY_SIZE(rt5514_spi_dapm_widgets));

	snd_soc_dapm_add_routes(dapm, intercon_common,
		ARRAY_SIZE(intercon_common));

	snd_soc_dapm_ignore_suspend(dapm, "SoundTrigger Capture");
	snd_soc_dapm_ignore_suspend(dapm, "SPI Capture");
	snd_soc_dapm_ignore_suspend(dapm, "DSP_IN");

	return 0;
}

static int rt5514_spi_dai_probe(struct snd_soc_dai *dai)
{
	return rt5514_spi_add_route(dai);
}

static struct snd_soc_dapm_widget rt5514_spi_dapm_widgets2[] = {
	/* Stream widgets */
	SND_SOC_DAPM_AIF_OUT("AIF_SPI_FE2", "SoundTrigger Capture 2", 0, 0, 0, 0),
	SND_SOC_DAPM_AIF_IN("AIF_SPI_BE2", "SPI Capture 2", 0, 0, 0, 0),
	SND_SOC_DAPM_INPUT("DSP_IN2"),
};

static const struct snd_soc_dapm_route intercon_common2[] = {
	{"AIF_SPI_FE2", NULL, "AIF_SPI_BE2"},
	{"SoundTrigger Capture 2", NULL, "AIF_SPI_FE2"},
	{"AIF_SPI_BE2", NULL, "DSP_IN2"},
	{"AIF_SPI_BE2", NULL, "SPI Capture 2"},
};

static int rt5514_spi_add_route2(struct snd_soc_dai *dai)
{
	struct snd_soc_dapm_context *dapm;

	if (!dai) {
		pr_err("%s: Invalid params dai\n", __func__);
		return -EINVAL;
	}

	if (!dai->driver) {
		pr_err("%s: Invalid params dai driver\n", __func__);
		return -EINVAL;
	}

	dapm = snd_soc_component_get_dapm(dai->component);
	if (!dai || !dai->driver) {
		pr_err("%s Invalid params\n", __func__);
		return -EINVAL;
	}

	snd_soc_dapm_new_controls(dapm, rt5514_spi_dapm_widgets2,
			ARRAY_SIZE(rt5514_spi_dapm_widgets2));

	snd_soc_dapm_add_routes(dapm, intercon_common2,
		ARRAY_SIZE(intercon_common2));

	snd_soc_dapm_ignore_suspend(dapm, "SoundTrigger Capture 2");
	snd_soc_dapm_ignore_suspend(dapm, "SPI Capture 2");
	snd_soc_dapm_ignore_suspend(dapm, "DSP_IN2");

	return 0;
}

static int rt5514_spi_dai_probe2(struct snd_soc_dai *dai)
{
	return rt5514_spi_add_route2(dai);
}

static struct snd_soc_dai_driver rt5514_spi_dai[] = {
	{
		.name = "rt5514-dsp-fe-dai1",
		.id = 0,
		.capture = {
			.stream_name = "SoundTrigger Capture",
			.aif_name = "AIF_SPI_FE",
			.channels_min = 1,
			.channels_max = 1,
			.rates = SNDRV_PCM_RATE_16000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.probe = rt5514_spi_dai_probe,
	},
	{
		.name = "rt5514-dsp-fe-dai2",
		.id = 1,
		.capture = {
			.stream_name = "SoundTrigger Capture 2",
			.aif_name = "AIF_SPI_FE2",
			.channels_min = 1,
			.channels_max = 1,
			.rates = SNDRV_PCM_RATE_16000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		.probe = rt5514_spi_dai_probe2,
	},
};

static struct snd_soc_dai_driver rt5514_be_dai[] = {
	{
		.name = "rt5514-dsp-be-dai1",
		.id = 0,
		.capture = {
			.stream_name = "SPI Capture",
			.aif_name = "AIF_SPI_BE",
			.channels_min = 1,
			.channels_max = 1,
			.rates = SNDRV_PCM_RATE_16000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	},
	{
		.name = "rt5514-dsp-be-dai2",
		.id = 1,
		.capture = {
			.stream_name = "SPI Capture 2",
			.aif_name = "AIF_SPI_BE2",
			.channels_min = 1,
			.channels_max = 1,
			.rates = SNDRV_PCM_RATE_16000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	},
};

static void rt5514_spi_copy_work_0(struct work_struct *work)
{
	struct rt5514_dsp *rt5514_dsp =
		container_of(work, struct rt5514_dsp, copy_work_0.work);
	struct snd_pcm_runtime *runtime;
	size_t period_bytes, truncated_bytes = 0;
	unsigned int cur_wp, remain_data;
	u8 buf[8];

	mutex_lock(&rt5514_dsp->dma_lock);
	if (!rt5514_dsp->substream[0]) {
		dev_err(rt5514_dsp->dev, "No pcm0 substream\n");
		goto done;
	}

	runtime = rt5514_dsp->substream[0]->runtime;
	period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream[0]);
	if (!period_bytes) {
		schedule_delayed_work(&rt5514_dsp->copy_work_0,
			msecs_to_jiffies(50));
		goto done;
	}

	if (rt5514_dsp->buf_size[0] % period_bytes)
		rt5514_dsp->buf_size[0] = (rt5514_dsp->buf_size[0] / period_bytes) *
			period_bytes;

	if (rt5514_dsp->get_size[0] >= rt5514_dsp->buf_size[0]) {
		rt5514_spi_burst_read(rt5514_dsp->buf_rp_addr[0], (u8 *)&buf,
			sizeof(buf));
		cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
					buf[3] << 24;
		if ((cur_wp & 0xfff00000) != RT5514_BUFFER_ADDR_RANGE) {
			dev_err(rt5514_dsp->dev, "Address read fail! 0x%x\n",
				cur_wp);
			schedule_delayed_work(&rt5514_dsp->copy_work_0,
				msecs_to_jiffies(50));
			goto done;
		}

		if (cur_wp >= rt5514_dsp->buf_rp[0])
			remain_data = (cur_wp - rt5514_dsp->buf_rp[0]);
		else
			remain_data =
				(rt5514_dsp->buf_limit[0] - rt5514_dsp->buf_rp[0]) +
				(cur_wp - rt5514_dsp->buf_base[0]);

		if (remain_data < period_bytes) {
			schedule_delayed_work(&rt5514_dsp->copy_work_0,
				msecs_to_jiffies(50));
			goto done;
		}
	}

	if (rt5514_dsp->buf_rp[0] + period_bytes <= rt5514_dsp->buf_limit[0]) {
		rt5514_spi_burst_read(rt5514_dsp->buf_rp[0],
			runtime->dma_area + rt5514_dsp->dma_offset[0],
			period_bytes);

		if (rt5514_dsp->buf_rp[0] + period_bytes == rt5514_dsp->buf_limit[0])
			rt5514_dsp->buf_rp[0] = rt5514_dsp->buf_base[0];
		else
			rt5514_dsp->buf_rp[0] += period_bytes;
	} else {
		truncated_bytes = rt5514_dsp->buf_limit[0] - rt5514_dsp->buf_rp[0];
		rt5514_spi_burst_read(rt5514_dsp->buf_rp[0],
			runtime->dma_area + rt5514_dsp->dma_offset[0],
			truncated_bytes);

		rt5514_spi_burst_read(rt5514_dsp->buf_base[0],
			runtime->dma_area + rt5514_dsp->dma_offset[0] +
			truncated_bytes, period_bytes - truncated_bytes);

		rt5514_dsp->buf_rp[0] = rt5514_dsp->buf_base[0] + period_bytes -
			truncated_bytes;
	}

	rt5514_dsp->get_size[0] += period_bytes;
	rt5514_dsp->dma_offset[0] += period_bytes;
	if (rt5514_dsp->dma_offset[0] >= runtime->dma_bytes)
		rt5514_dsp->dma_offset[0] = 0;

	snd_pcm_period_elapsed(rt5514_dsp->substream[0]);

	schedule_delayed_work(&rt5514_dsp->copy_work_0, msecs_to_jiffies(10));

done:
	mutex_unlock(&rt5514_dsp->dma_lock);
}

static void rt5514_spi_copy_work_1(struct work_struct *work)
{
	struct rt5514_dsp *rt5514_dsp =
		container_of(work, struct rt5514_dsp, copy_work_1.work);
	struct snd_pcm_runtime *runtime;
	size_t period_bytes, truncated_bytes = 0;
	unsigned int cur_wp, remain_data;
	u8 buf[8];

	mutex_lock(&rt5514_dsp->dma_lock);
	if (!rt5514_dsp->substream[1]) {
		dev_err(rt5514_dsp->dev, "No pcm1 substream\n");
		goto done;
	}

	runtime = rt5514_dsp->substream[1]->runtime;
	period_bytes = snd_pcm_lib_period_bytes(rt5514_dsp->substream[1]);
	if (!period_bytes) {
		schedule_delayed_work(&rt5514_dsp->copy_work_1,
			msecs_to_jiffies(50));
		goto done;
	}

	if (rt5514_dsp->buf_size[1] % period_bytes)
		rt5514_dsp->buf_size[1] = (rt5514_dsp->buf_size[1] / period_bytes) *
			period_bytes;

	if (rt5514_dsp->get_size[1] >= rt5514_dsp->buf_size[1]) {
		rt5514_spi_burst_read(rt5514_dsp->buf_rp_addr[1], (u8 *)&buf,
			sizeof(buf));
		cur_wp = buf[0] | buf[1] << 8 | buf[2] << 16 |
					buf[3] << 24;
		if ((cur_wp & 0xfff00000) != RT5514_BUFFER_ADDR_RANGE) {
			dev_err(rt5514_dsp->dev, "Address read fail! 0x%x\n",
				cur_wp);
			schedule_delayed_work(&rt5514_dsp->copy_work_1,
				msecs_to_jiffies(50));
			goto done;
		}

		if (cur_wp >= rt5514_dsp->buf_rp[1])
			remain_data = (cur_wp - rt5514_dsp->buf_rp[1]);
		else
			remain_data =
				(rt5514_dsp->buf_limit[1] - rt5514_dsp->buf_rp[1]) +
				(cur_wp - rt5514_dsp->buf_base[1]);

		if (remain_data < period_bytes) {
			schedule_delayed_work(&rt5514_dsp->copy_work_1,
				msecs_to_jiffies(50));
			goto done;
		}
	}

	if (rt5514_dsp->buf_rp[1] + period_bytes <= rt5514_dsp->buf_limit[1]) {
		rt5514_spi_burst_read(rt5514_dsp->buf_rp[1],
			runtime->dma_area + rt5514_dsp->dma_offset[1],
			period_bytes);

		if (rt5514_dsp->buf_rp[1] + period_bytes == rt5514_dsp->buf_limit[1])
			rt5514_dsp->buf_rp[1] = rt5514_dsp->buf_base[1];
		else
			rt5514_dsp->buf_rp[1] += period_bytes;
	} else {
		truncated_bytes = rt5514_dsp->buf_limit[1] - rt5514_dsp->buf_rp[1];
		rt5514_spi_burst_read(rt5514_dsp->buf_rp[1],
			runtime->dma_area + rt5514_dsp->dma_offset[1],
			truncated_bytes);

		rt5514_spi_burst_read(rt5514_dsp->buf_base[1],
			runtime->dma_area + rt5514_dsp->dma_offset[1] +
			truncated_bytes, period_bytes - truncated_bytes);

		rt5514_dsp->buf_rp[1] = rt5514_dsp->buf_base[1] + period_bytes -
			truncated_bytes;
	}

	rt5514_dsp->get_size[1] += period_bytes;
	rt5514_dsp->dma_offset[1] += period_bytes;
	if (rt5514_dsp->dma_offset[1] >= runtime->dma_bytes)
		rt5514_dsp->dma_offset[1] = 0;

	snd_pcm_period_elapsed(rt5514_dsp->substream[1]);

	schedule_delayed_work(&rt5514_dsp->copy_work_1, msecs_to_jiffies(10));

done:
	mutex_unlock(&rt5514_dsp->dma_lock);
}

static void rt5514_schedule_copy(struct rt5514_dsp *rt5514_dsp)
{
	u8 buf[8];
	unsigned int base_addr, limit_addr, truncated_bytes, buf_ignore_size;
	unsigned int hotword_flag, musdet_flag, stream_flag;

	rt5514_spi_burst_read(RT5514_HOTWORD_FLAG, (u8 *)&buf, sizeof(buf));
	hotword_flag = buf[0] | buf[1] << 8 | buf[2] << 16 |
		buf[3] << 24;

	rt5514_spi_burst_read(RT5514_MUSDET_FLAG, (u8 *)&buf, sizeof(buf));
	musdet_flag = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;

	if (hotword_flag == 1) {
		stream_flag = RT5514_DSP_STREAM_HOTWORD;
		base_addr = RT5514_BUFFER_VOICE_BASE;
		limit_addr = RT5514_BUFFER_VOICE_LIMIT;
		rt5514_dsp->buf_rp_addr[0] = RT5514_BUFFER_VOICE_WP;
		buf_ignore_size = rt5514_dsp->hotword_ignore_ms * 2 * 16;
		memset(buf, 0, sizeof(buf));
		rt5514_spi_burst_write(RT5514_HOTWORD_FLAG, buf, 8);
	} else if (musdet_flag == 1) {
		stream_flag = RT5514_DSP_STREAM_MUSDET;
		base_addr = RT5514_BUFFER_MUSIC_BASE;
		limit_addr = RT5514_BUFFER_MUSIC_LIMIT;
		rt5514_dsp->buf_rp_addr[1] = RT5514_BUFFER_MUSIC_WP;
		buf_ignore_size = rt5514_dsp->musdet_ignore_ms * 16;
		memset(buf, 0, sizeof(buf));
		rt5514_spi_burst_write(RT5514_MUSDET_FLAG, buf, 8);
	} else {
		return;
	}

        rt5514_stream_flag = stream_flag;
	if (stream_flag == RT5514_DSP_STREAM_HOTWORD) {
		if (!rt5514_dsp->substream[0] || rt5514_dsp->stream_flag[0]) {
			dev_err(rt5514_dsp->dev, "No pcm0 substream or it is streaming\n");
			return;
		} else {
			rt5514_dsp->stream_flag[0] = stream_flag;
			rt5514_dsp->get_size[0] = 0;
		}
	} else if (stream_flag == RT5514_DSP_STREAM_MUSDET) {
		if (!rt5514_dsp->substream[1] || rt5514_dsp->stream_flag[1]) {
			dev_err(rt5514_dsp->dev, "No pcm1 substream or it is streaming\n");
			return;
		} else {
			rt5514_dsp->stream_flag[1] = stream_flag;
			rt5514_dsp->get_size[1] = 0;
		}
	} else {
		return;
	}

	/**
	 * The address area x1800XXXX is the register address, and it cannot
	 * support spi burst read perfectly. So we use the spi burst read
	 * individually to make sure the data correctly.
	 */
	rt5514_spi_burst_read(base_addr, (u8 *)&buf, sizeof(buf));
	rt5514_dsp->buf_base[stream_flag - 1] = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;
	if ((rt5514_dsp->buf_base[stream_flag - 1] & 0xfff00000) != RT5514_BUFFER_ADDR_RANGE) {
		dev_err(rt5514_dsp->dev, "Base address read fail! 0x%x\n",
			rt5514_dsp->buf_base[stream_flag - 1]);
		return;
	}

	rt5514_spi_burst_read(limit_addr, (u8 *)&buf, sizeof(buf));
	rt5514_dsp->buf_limit[stream_flag - 1] = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;
	if ((rt5514_dsp->buf_limit[stream_flag - 1] & 0xfff00000) != RT5514_BUFFER_ADDR_RANGE) {
		dev_err(rt5514_dsp->dev, "Limit address read fail! 0x%x\n",
			rt5514_dsp->buf_limit[stream_flag - 1]);
		return;
	}

	if (rt5514_dsp->buf_limit[stream_flag - 1] % 8)
		rt5514_dsp->buf_limit[stream_flag - 1] =
		((rt5514_dsp->buf_limit[stream_flag - 1] / 8) + 1) * 8;

	rt5514_spi_burst_read(rt5514_dsp->buf_rp_addr[stream_flag - 1],
		(u8 *)&buf, sizeof(buf));
	rt5514_dsp->buf_rp[stream_flag - 1] = buf[0] | buf[1] << 8 | buf[2] << 16 |
				buf[3] << 24;
	if ((rt5514_dsp->buf_rp[stream_flag - 1] & 0xfff00000) != RT5514_BUFFER_ADDR_RANGE) {
		dev_err(rt5514_dsp->dev, "Buffer address read fail! 0x%x\n",
			rt5514_dsp->buf_rp[stream_flag - 1]);
		return;
	}

	rt5514_dsp->buf_rp[stream_flag - 1] += buf_ignore_size;

	if (rt5514_dsp->buf_rp[stream_flag - 1] >= rt5514_dsp->buf_limit[stream_flag - 1]) {
		truncated_bytes = rt5514_dsp->buf_rp[stream_flag - 1] -
			rt5514_dsp->buf_limit[stream_flag - 1];

		rt5514_dsp->buf_rp[stream_flag - 1] = rt5514_dsp->buf_base[stream_flag - 1] +
			truncated_bytes;
	}

	if (rt5514_dsp->buf_rp[stream_flag - 1] % 8)
		rt5514_dsp->buf_rp[stream_flag - 1] = (rt5514_dsp->buf_rp[stream_flag - 1] / 8) * 8;

	rt5514_dsp->buf_size[stream_flag - 1] = rt5514_dsp->buf_limit[stream_flag - 1] -
		rt5514_dsp->buf_base[stream_flag - 1] - buf_ignore_size;

	if (rt5514_dsp->buf_base[stream_flag - 1] && rt5514_dsp->buf_limit[stream_flag - 1] &&
		rt5514_dsp->buf_rp[stream_flag - 1] && rt5514_dsp->buf_size[stream_flag - 1]) {

		if (stream_flag == RT5514_DSP_STREAM_HOTWORD) {
			schedule_delayed_work(&rt5514_dsp->copy_work_0,
				msecs_to_jiffies(0));
		} else if (stream_flag == RT5514_DSP_STREAM_MUSDET) {
			schedule_delayed_work(&rt5514_dsp->copy_work_1,
				msecs_to_jiffies(0));
		} else
			return;

	}
}

static void rt5514_spi_start_work(struct work_struct *work) {
	struct rt5514_dsp *rt5514_dsp =
		container_of(work, struct rt5514_dsp, start_work.work);
	struct snd_card *card;

	if (rt5514_dsp->substream[0] && rt5514_dsp->substream[0]->pcm)
		card = rt5514_dsp->substream[0]->pcm->card;
	else if (rt5514_dsp->substream[1] && rt5514_dsp->substream[1]->pcm)
		card = rt5514_dsp->substream[1]->pcm->card;
	else
		return;

	snd_power_lock(card);
	if (!snd_power_wait(card, SNDRV_CTL_POWER_D0))
		rt5514_schedule_copy(rt5514_dsp);
	snd_power_unlock(card);
}

static irqreturn_t rt5514_spi_irq(int irq, void *data)
{
	struct rt5514_dsp *rt5514_dsp = data;

	pm_wakeup_event(rt5514_dsp->dev, WAKEUP_TIMEOUT);
	cancel_delayed_work_sync(&rt5514_dsp->start_work);
	schedule_delayed_work(&rt5514_dsp->start_work, msecs_to_jiffies(0));

	return IRQ_HANDLED;
}

/* PCM for streaming audio from the DSP buffer */
static int rt5514_spi_pcm_open(struct snd_pcm_substream *substream)
{
	snd_soc_set_runtime_hwparams(substream, &rt5514_spi_pcm_hardware);

	return 0;
}

static int rt5514_spi_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *hw_params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);
	int ret;

	mutex_lock(&rt5514_dsp->dma_lock);
	ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
			params_buffer_bytes(hw_params));
	rt5514_dsp->substream[cpu_dai->id] = substream;
	rt5514_dsp->dma_offset[cpu_dai->id] = 0;
	mutex_unlock(&rt5514_dsp->dma_lock);

	return ret;
}

static int rt5514_spi_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct rt5514_dsp *rt5514_dsp =
			snd_soc_platform_get_drvdata(rtd->platform);

	mutex_lock(&rt5514_dsp->dma_lock);
	rt5514_dsp->substream[cpu_dai->id] = NULL;
	mutex_unlock(&rt5514_dsp->dma_lock);

	if (cpu_dai->id)
		cancel_delayed_work_sync(&rt5514_dsp->copy_work_1);
	else
		cancel_delayed_work_sync(&rt5514_dsp->copy_work_0);

	rt5514_dsp->stream_flag[cpu_dai->id] = RT5514_DSP_NO_STREAM;
        rt5514_stream_flag = RT5514_DSP_NO_STREAM;

	return snd_pcm_lib_free_vmalloc_buffer(substream);
}

static snd_pcm_uframes_t rt5514_spi_pcm_pointer(
		struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct rt5514_dsp *rt5514_dsp =
		snd_soc_platform_get_drvdata(rtd->platform);

	return bytes_to_frames(runtime, rt5514_dsp->dma_offset[cpu_dai->id]);
}

static const struct snd_pcm_ops rt5514_spi_pcm_ops = {
	.open		= rt5514_spi_pcm_open,
	.hw_params	= rt5514_spi_hw_params,
	.hw_free	= rt5514_spi_hw_free,
	.pointer	= rt5514_spi_pcm_pointer,
	.mmap		= snd_pcm_lib_mmap_vmalloc,
	.page		= snd_pcm_lib_get_vmalloc_page,
};

static int rt5514_pcm_parse_dp(struct rt5514_dsp *rt5514_dsp,
	struct device *dev)
{
	rt5514_dsp->musdet_ignore_ms = 0;
	rt5514_dsp->hotword_ignore_ms = 0;

	device_property_read_u32(dev, "realtek,musdet-ignore-ms",
		&rt5514_dsp->musdet_ignore_ms);
	device_property_read_u32(dev, "realtek,hotword-ignore-ms",
		&rt5514_dsp->hotword_ignore_ms);

	pr_info("%s: musdet_ig_ms %d hotword_ig_ms %d\n", __func__,
		rt5514_dsp->musdet_ignore_ms, rt5514_dsp->hotword_ignore_ms);

	return 0;
}

static int rt5514_spi_pcm_probe(struct snd_soc_platform *platform)
{
	struct rt5514_dsp *rt5514_dsp;
	int ret;

	rt5514_dsp = devm_kzalloc(platform->dev, sizeof(*rt5514_dsp),
			GFP_KERNEL);
	if (rt5514_dsp == NULL)
		return -ENOMEM;

	rt5514_pcm_parse_dp(rt5514_dsp, &rt5514_spi->dev);
	rt5514_dsp->dev = &rt5514_spi->dev;
	mutex_init(&rt5514_dsp->dma_lock);
	INIT_DELAYED_WORK(&rt5514_dsp->copy_work_0, rt5514_spi_copy_work_0);
	INIT_DELAYED_WORK(&rt5514_dsp->copy_work_1, rt5514_spi_copy_work_1);
	INIT_DELAYED_WORK(&rt5514_dsp->start_work, rt5514_spi_start_work);
	snd_soc_platform_set_drvdata(platform, rt5514_dsp);

	wakeup_source_init(&rt5514_dsp->ws, "rt5514-spi");
	mutex_init(&rt5514_dsp->count_lock);
	rt5514_dsp->wake_count = 0;

	if (rt5514_spi->irq) {
		ret = devm_request_threaded_irq(&rt5514_spi->dev,
			rt5514_spi->irq, NULL, rt5514_spi_irq,
			IRQF_TRIGGER_RISING | IRQF_ONESHOT, "rt5514-spi",
			rt5514_dsp);
		if (ret)
			dev_err(&rt5514_spi->dev,
				"%s Failed to reguest IRQ: %d\n", __func__,
				ret);

		ret = enable_irq_wake(rt5514_spi->irq);
		if (ret)
			dev_err(&rt5514_spi->dev,
				"Failed to set wake interrupt on IRQ %d: %d\n",
				rt5514_spi->irq, ret);
	}

	return 0;
}

static struct snd_soc_platform_driver rt5514_spi_platform = {
	.probe = rt5514_spi_pcm_probe,
	.ops = &rt5514_spi_pcm_ops,
};

static const struct snd_soc_component_driver rt5514_spi_dai_component = {
	.name		= "rt5514-spi-dai",
};

static const struct snd_soc_component_driver rt5514_be_dai_component = {
	.name		= "rt5514-be-dai",
};

/**
 * rt5514_spi_burst_read - Read data from SPI by rt5514 address.
 * @addr: Start address.
 * @rxbuf: Data Buffer for reading.
 * @len: Data length, it must be a multiple of 8.
 *
 *
 * Returns true for success.
 */
int rt5514_spi_burst_read(unsigned int addr, u8 *rxbuf, size_t len)
{
	u8 spi_cmd = RT5514_SPI_CMD_BURST_READ;
	int status;
	u8 *write_buf;
	u8 *read_buf;
	unsigned int i, end, offset = 0;
	struct spi_message message;
	struct spi_transfer x[3];
	struct snd_soc_platform *platform =
		snd_soc_lookup_platform(&rt5514_spi->dev);
	struct rt5514_dsp *rt5514_dsp =
		snd_soc_platform_get_drvdata(platform);

	mutex_lock(&rt5514_dsp->count_lock);
	if (rt5514_dsp->wake_count++ == 0)
		__pm_stay_awake(&rt5514_dsp->ws);
	mutex_unlock(&rt5514_dsp->count_lock);

	write_buf = kzalloc(8, GFP_DMA | GFP_KERNEL);
	read_buf = kzalloc(RT5514_SPI_BUF_LEN, GFP_DMA | GFP_KERNEL);

	while (offset < len) {
		if (offset + RT5514_SPI_BUF_LEN <= len)
			end = RT5514_SPI_BUF_LEN;
		else
			end = len % RT5514_SPI_BUF_LEN;

		write_buf[0] = spi_cmd;
		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;

		spi_message_init(&message);
		memset(x, 0, sizeof(x));

		x[0].len = 5;
		x[0].tx_buf = write_buf;
		spi_message_add_tail(&x[0], &message);

		x[1].len = 4;
		x[1].tx_buf = write_buf;
		spi_message_add_tail(&x[1], &message);

		x[2].len = end;
		x[2].rx_buf = read_buf;
		spi_message_add_tail(&x[2], &message);

		status = spi_sync(rt5514_spi, &message);

		if (status) {
			kfree(read_buf);
			kfree(write_buf);
			mutex_lock(&rt5514_dsp->count_lock);
			if (--rt5514_dsp->wake_count == 0)
				__pm_relax(&rt5514_dsp->ws);
			mutex_unlock(&rt5514_dsp->count_lock);
			return false;
		}

		memcpy(rxbuf + offset, read_buf, end);

		offset += RT5514_SPI_BUF_LEN;
	}

	for (i = 0; i < len; i += 8) {
		write_buf[0] = rxbuf[i + 0];
		write_buf[1] = rxbuf[i + 1];
		write_buf[2] = rxbuf[i + 2];
		write_buf[3] = rxbuf[i + 3];
		write_buf[4] = rxbuf[i + 4];
		write_buf[5] = rxbuf[i + 5];
		write_buf[6] = rxbuf[i + 6];
		write_buf[7] = rxbuf[i + 7];

		rxbuf[i + 0] = write_buf[7];
		rxbuf[i + 1] = write_buf[6];
		rxbuf[i + 2] = write_buf[5];
		rxbuf[i + 3] = write_buf[4];
		rxbuf[i + 4] = write_buf[3];
		rxbuf[i + 5] = write_buf[2];
		rxbuf[i + 6] = write_buf[1];
		rxbuf[i + 7] = write_buf[0];
	}

	kfree(read_buf);
	kfree(write_buf);

	mutex_lock(&rt5514_dsp->count_lock);
	if (--rt5514_dsp->wake_count == 0)
		__pm_relax(&rt5514_dsp->ws);
	mutex_unlock(&rt5514_dsp->count_lock);

	return true;
}
EXPORT_SYMBOL_GPL(rt5514_spi_burst_read);

/**
 * rt5514_spi_burst_write - Write data to SPI by rt5514 address.
 * @addr: Start address.
 * @txbuf: Data Buffer for writng.
 * @len: Data length, it must be a multiple of 8.
 *
 *
 * Returns true for success.
 */
int rt5514_spi_burst_write(u32 addr, const u8 *txbuf, size_t len)
{
	u8 spi_cmd = RT5514_SPI_CMD_BURST_WRITE;
	u8 *write_buf;
	unsigned int i, j, end, offset = 0;
	struct snd_soc_platform *platform =
		snd_soc_lookup_platform(&rt5514_spi->dev);
	struct rt5514_dsp *rt5514_dsp =
		snd_soc_platform_get_drvdata(platform);

	mutex_lock(&rt5514_dsp->count_lock);
	if (rt5514_dsp->wake_count++ == 0)
		__pm_stay_awake(&rt5514_dsp->ws);
	mutex_unlock(&rt5514_dsp->count_lock);

	write_buf = kzalloc(RT5514_SPI_BUF_LEN + 6, GFP_DMA | GFP_KERNEL);

	while (offset < len) {
		if (offset + RT5514_SPI_BUF_LEN <= len)
			end = RT5514_SPI_BUF_LEN;
		else
			end = len % RT5514_SPI_BUF_LEN;

		write_buf[0] = spi_cmd;
		write_buf[1] = ((addr + offset) & 0xff000000) >> 24;
		write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16;
		write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8;
		write_buf[4] = ((addr + offset) & 0x000000ff) >> 0;

		for (i = 0; i < end; i += 8) {
			for (j = 0; j < 8; j++) {
				if ((offset + i + j) < len) {
					write_buf[i + 12 - j] =
						txbuf[offset + i + j];
				} else {
					break;
				}
			}
		}

		if (end % 8)
			end = (end / 8 + 1) * 8;

		write_buf[end + 5] = spi_cmd;

		spi_write(rt5514_spi, write_buf, end + 6);

		offset += RT5514_SPI_BUF_LEN;
	}

	kfree(write_buf);

	mutex_lock(&rt5514_dsp->count_lock);
	if (--rt5514_dsp->wake_count == 0)
		__pm_relax(&rt5514_dsp->ws);
	mutex_unlock(&rt5514_dsp->count_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(rt5514_spi_burst_write);

static int rt5514_spi_probe(struct spi_device *spi)
{
	int ret;
	int irq_gpio = 0;
	struct device_node *np = spi->dev.of_node;

	rt5514_spi = spi;

	ret = devm_snd_soc_register_platform(&spi->dev, &rt5514_spi_platform);
	if (ret < 0) {
		dev_err(&spi->dev, "Failed to register platform.\n");
		return ret;
	}


	ret = devm_snd_soc_register_component(&spi->dev,
					      &rt5514_spi_dai_component,
					      rt5514_spi_dai,
					      ARRAY_SIZE(rt5514_spi_dai));
	if (ret < 0) {
		dev_err(&spi->dev, "Failed to register component.\n");
		return ret;
	}

	ret = devm_snd_soc_register_component(&spi->dev,
					      &rt5514_be_dai_component,
					      rt5514_be_dai,
					      ARRAY_SIZE(rt5514_be_dai));
	if (ret < 0) {
		dev_info(&spi->dev, "Failed to register be component.\n");
		return ret;
	}

	irq_gpio = of_get_named_gpio(np, "irq-gpio", 0);

	if (!gpio_is_valid(irq_gpio)) {
		dev_err(&rt5514_spi->dev, "Look %s property %s fail on %d\n",
			"irq-gpio", np->full_name, irq_gpio);
	} else {
		dev_info(&rt5514_spi->dev, "Detect gpio %d property %s\n",
			irq_gpio, np->full_name);

		ret = gpio_request(irq_gpio, "irq-gpio");
		gpio_direction_input(irq_gpio);
		if (ret)
			dev_err(&rt5514_spi->dev,
				"%s Failed to reguest GPIO: %d\n", __func__,
				ret);
		rt5514_spi->irq = gpio_to_irq(irq_gpio);
	}

	device_init_wakeup(&spi->dev, true);

	return 0;
}

static int rt5514_suspend(struct device *dev)
{
	int irq = to_spi_device(dev)->irq;

	if (device_may_wakeup(dev))
		enable_irq_wake(irq);

	return 0;
}

static int rt5514_resume(struct device *dev)
{
	int irq = to_spi_device(dev)->irq;

	if (device_may_wakeup(dev))
		disable_irq_wake(irq);

	return 0;
}

static const struct dev_pm_ops rt5514_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(rt5514_suspend, rt5514_resume)
};

static const struct of_device_id rt5514_of_match[] = {
	{ .compatible = "realtek,rt5514", },
	{},
};
MODULE_DEVICE_TABLE(of, rt5514_of_match);

static struct spi_driver rt5514_spi_driver = {
	.driver = {
		.name = "rt5514",
		.pm = &rt5514_pm_ops,
		.of_match_table = of_match_ptr(rt5514_of_match),
	},
	.probe = rt5514_spi_probe,
};
module_spi_driver(rt5514_spi_driver);

MODULE_DESCRIPTION("RT5514 SPI driver");
MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>");
MODULE_LICENSE("GPL v2");