C++ params_format函数代码示例

static int uda134x_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->card->codec;
	struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);
	u8 hw_params;

	if (substream == uda134x->slave_substream) {
		pr_debug("%s ignoring hw_params for slave substream\n",
			 __func__);
		return 0;
	}

	hw_params = uda134x_read_reg_cache(codec, UDA134X_STATUS0);
	hw_params &= STATUS0_SYSCLK_MASK;
	hw_params &= STATUS0_DAIFMT_MASK;

	pr_debug("%s sysclk: %d, rate:%d\n", __func__,
		 uda134x->sysclk, params_rate(params));

	/* set SYSCLK / fs ratio */
	switch (uda134x->sysclk / params_rate(params)) {
	case 512:
		break;
	case 384:
		hw_params |= (1<<4);
		break;
	case 256:
		hw_params |= (1<<5);
		break;
	default:
		printk(KERN_ERR "%s unsupported fs\n", __func__);
		return -EINVAL;
	}

	pr_debug("%s dai_fmt: %d, params_format:%d\n", __func__,
		 uda134x->dai_fmt, params_format(params));

	/* set DAI format and word length */
	switch (uda134x->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		switch (params_format(params)) {
		case SNDRV_PCM_FORMAT_S16_LE:
			hw_params |= (1<<1);
			break;
		case SNDRV_PCM_FORMAT_S18_3LE:
			hw_params |= (1<<2);
			break;
		case SNDRV_PCM_FORMAT_S20_3LE:
			hw_params |= ((1<<2) | (1<<1));
			break;
		default:
			printk(KERN_ERR "%s unsupported format (right)\n",
			       __func__);
			return -EINVAL;
		}
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		hw_params |= (1<<3);
		break;
	default:
		printk(KERN_ERR "%s unsupported format\n", __func__);
		return -EINVAL;
	}

	uda134x_write(codec, UDA134X_STATUS0, hw_params);

	return 0;
}

static int wm8940_i2s_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	u16 iface = snd_soc_read(codec, WM8940_IFACE) & 0xFD9F;
	u16 addcntrl = snd_soc_read(codec, WM8940_ADDCNTRL) & 0xFFF1;
	u16 companding =  snd_soc_read(codec,
						WM8940_COMPANDINGCTL) & 0xFFDF;
	int ret;

	/* LoutR control */
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
	    && params_channels(params) == 2)
		iface |= (1 << 9);

	switch (params_rate(params)) {
	case 8000:
		addcntrl |= (0x5 << 1);
		break;
	case 11025:
		addcntrl |= (0x4 << 1);
		break;
	case 16000:
		addcntrl |= (0x3 << 1);
		break;
	case 22050:
		addcntrl |= (0x2 << 1);
		break;
	case 32000:
		addcntrl |= (0x1 << 1);
		break;
	case 44100:
	case 48000:
		break;
	}
	ret = snd_soc_write(codec, WM8940_ADDCNTRL, addcntrl);
	if (ret)
		goto error_ret;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		companding = companding | (1 << 5);
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= (1 << 5);
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= (2 << 5);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		iface |= (3 << 5);
		break;
	}
	ret = snd_soc_write(codec, WM8940_COMPANDINGCTL, companding);
	if (ret)
		goto error_ret;
	ret = snd_soc_write(codec, WM8940_IFACE, iface);

error_ret:
	return ret;
}

static int mop500_ab8500_hw_params(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct device *dev = rtd->card->dev;
	unsigned int fmt;
	int channels, ret = 0, driver_mode, slots;
	unsigned int sw_codec, sw_cpu;
	bool is_playback;

	dev_dbg(dev, "%s: Enter\n", __func__);

	dev_dbg(dev, "%s: substream->pcm->name = %s\n"
		"substream->pcm->id = %s.\n"
		"substream->name = %s.\n"
		"substream->number = %d.\n",
		__func__,
		substream->pcm->name,
		substream->pcm->id,
		substream->name,
		substream->number);

	/* Ensure configuration consistency between DAIs */
	mutex_lock(&mop500_ab8500_params_lock);
	if (mop500_ab8500_usage) {
		if (mop500_ab8500_rate != params_rate(params) ||
		    mop500_ab8500_channels != params_channels(params)) {
			mutex_unlock(&mop500_ab8500_params_lock);
			return -EBUSY;
		}
	} else {
		mop500_ab8500_rate = params_rate(params);
		mop500_ab8500_channels = params_channels(params);
	}
	__set_bit(cpu_dai->id, &mop500_ab8500_usage);
	mutex_unlock(&mop500_ab8500_params_lock);

	channels = params_channels(params);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S32_LE:
		sw_cpu = 32;
		break;

	case SNDRV_PCM_FORMAT_S16_LE:
		sw_cpu = 16;
		break;

	default:
		return -EINVAL;
	}

	/* Setup codec depending on driver-mode */
	if (channels == 8)
		driver_mode = DRIVERMODE_CODEC_ONLY;
	else
		driver_mode = DRIVERMODE_NORMAL;
	dev_dbg(dev, "%s: Driver-mode: %s.\n", __func__,
		(driver_mode == DRIVERMODE_NORMAL) ? "NORMAL" : "CODEC_ONLY");

	/* Setup format */

	if (driver_mode == DRIVERMODE_NORMAL) {
		fmt = SND_SOC_DAIFMT_DSP_A |
			SND_SOC_DAIFMT_CBM_CFM |
			SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_CONT;
	} else {
		fmt = SND_SOC_DAIFMT_DSP_A |
			SND_SOC_DAIFMT_CBM_CFM |
			SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_GATED;
	}

	ret = snd_soc_dai_set_fmt(codec_dai, fmt);
	if (ret < 0) {
		dev_err(dev,
			"%s: ERROR: snd_soc_dai_set_fmt failed for codec_dai (ret = %d)!\n",
			__func__, ret);
		return ret;
	}

	ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
	if (ret < 0) {
		dev_err(dev,
			"%s: ERROR: snd_soc_dai_set_fmt failed for cpu_dai (ret = %d)!\n",
			__func__, ret);
		return ret;
	}

	/* Setup TDM-slots */

	is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
	switch (channels) {
	case 1:
		slots = 16;
		tx_slots = (is_playback) ? TX_SLOT_MONO : 0;
		rx_slots = (is_playback) ? 0 : RX_SLOT_MONO;
//.........这里部分代码省略.........

/*
 * Configure the SSC.
 */
static int atmel_ssc_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
{
	int id = dai->id;
	struct atmel_ssc_info *ssc_p = &ssc_info[id];
	struct atmel_pcm_dma_params *dma_params;
	int dir, channels, bits;
	u32 tfmr, rfmr, tcmr, rcmr;
	int start_event;
	int ret;

	/*
	 * Currently, there is only one set of dma params for
	 * each direction.  If more are added, this code will
	 * have to be changed to select the proper set.
	 */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 0;
	else
		dir = 1;

	dma_params = ssc_p->dma_params[dir];

	channels = params_channels(params);

	/*
	 * Determine sample size in bits and the PDC increment.
	 */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		bits = 8;
		dma_params->pdc_xfer_size = 1;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		bits = 16;
		dma_params->pdc_xfer_size = 2;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		bits = 24;
		dma_params->pdc_xfer_size = 4;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		bits = 32;
		dma_params->pdc_xfer_size = 4;
		break;
	default:
		printk(KERN_WARNING "atmel_ssc_dai: unsupported PCM format");
		return -EINVAL;
	}

	/*
	 * The SSC only supports up to 16-bit samples in I2S format, due
	 * to the size of the Frame Mode Register FSLEN field.
	 */
	if ((ssc_p->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S
		&& bits > 16) {
		printk(KERN_WARNING
				"atmel_ssc_dai: sample size %d "
				"is too large for I2S\n", bits);
		return -EINVAL;
	}

	/*
	 * Compute SSC register settings.
	 */
	switch (ssc_p->daifmt
		& (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_MASTER_MASK)) {

	case SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS:
		/*
		 * I2S format, SSC provides BCLK and LRC clocks.
		 *
		 * The SSC transmit and receive clocks are generated
		 * from the MCK divider, and the BCLK signal
		 * is output on the SSC TK line.
		 */
		rcmr =	  SSC_BF(RCMR_PERIOD, ssc_p->rcmr_period)
			| SSC_BF(RCMR_STTDLY, START_DELAY)
			| SSC_BF(RCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(RCMR_CKI, SSC_CKI_RISING)
			| SSC_BF(RCMR_CKO, SSC_CKO_NONE)
			| SSC_BF(RCMR_CKS, SSC_CKS_DIV);

		rfmr =	  SSC_BF(RFMR_FSEDGE, SSC_FSEDGE_POSITIVE)
			| SSC_BF(RFMR_FSOS, SSC_FSOS_NEGATIVE)
			| SSC_BF(RFMR_FSLEN, (bits - 1))
			| SSC_BF(RFMR_DATNB, (channels - 1))
			| SSC_BIT(RFMR_MSBF)
			| SSC_BF(RFMR_LOOP, 0)
			| SSC_BF(RFMR_DATLEN, (bits - 1));

		tcmr =	  SSC_BF(TCMR_PERIOD, ssc_p->tcmr_period)
			| SSC_BF(TCMR_STTDLY, START_DELAY)
			| SSC_BF(TCMR_START, SSC_START_FALLING_RF)
			| SSC_BF(TCMR_CKI, SSC_CKI_FALLING)
			| SSC_BF(TCMR_CKO, SSC_CKO_CONTINUOUS)
//.........这里部分代码省略.........

static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
				    struct snd_pcm_hw_params *params,
				    struct snd_soc_dai *cpu_dai)
{
	struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
	struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int wlen, channels, wpf;
	int pkt_size = 0;
	unsigned int format, div, framesize, master;

	dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
	channels = params_channels(params);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		wlen = 16;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		wlen = 32;
		break;
	default:
		return -EINVAL;
	}
	if (mcbsp->pdata->buffer_size) {
		if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) {
			int period_words, max_thrsh;
			int divider = 0;

			period_words = params_period_bytes(params) / (wlen / 8);
			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
				max_thrsh = mcbsp->max_tx_thres;
			else
				max_thrsh = mcbsp->max_rx_thres;
			/*
			 * Use sDMA packet mode if McBSP is in threshold mode:
			 * If period words less than the FIFO size the packet
			 * size is set to the number of period words, otherwise
			 * Look for the biggest threshold value which divides
			 * the period size evenly.
			 */
			divider = period_words / max_thrsh;
			if (period_words % max_thrsh)
				divider++;
			while (period_words % divider &&
				divider < period_words)
				divider++;
			if (divider == period_words)
				return -EINVAL;

			pkt_size = period_words / divider;
		} else if (channels > 1) {
			/* Use packet mode for non mono streams */
			pkt_size = channels;
		}
		omap_mcbsp_set_threshold(substream, pkt_size);
	}

	dma_data->maxburst = pkt_size;

	if (mcbsp->configured) {
		/* McBSP already configured by another stream */
		return 0;
	}

	regs->rcr2	&= ~(RPHASE | RFRLEN2(0x7f) | RWDLEN2(7));
	regs->xcr2	&= ~(RPHASE | XFRLEN2(0x7f) | XWDLEN2(7));
	regs->rcr1	&= ~(RFRLEN1(0x7f) | RWDLEN1(7));
	regs->xcr1	&= ~(XFRLEN1(0x7f) | XWDLEN1(7));
	format = mcbsp->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
	wpf = channels;
	if (channels == 2 && (format == SND_SOC_DAIFMT_I2S ||
			      format == SND_SOC_DAIFMT_LEFT_J)) {
		/* Use dual-phase frames */
		regs->rcr2	|= RPHASE;
		regs->xcr2	|= XPHASE;
		/* Set 1 word per (McBSP) frame for phase1 and phase2 */
		wpf--;
		regs->rcr2	|= RFRLEN2(wpf - 1);
		regs->xcr2	|= XFRLEN2(wpf - 1);
	}

	regs->rcr1	|= RFRLEN1(wpf - 1);
	regs->xcr1	|= XFRLEN1(wpf - 1);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		/* Set word lengths */
		regs->rcr2	|= RWDLEN2(OMAP_MCBSP_WORD_16);
		regs->rcr1	|= RWDLEN1(OMAP_MCBSP_WORD_16);
		regs->xcr2	|= XWDLEN2(OMAP_MCBSP_WORD_16);
		regs->xcr1	|= XWDLEN1(OMAP_MCBSP_WORD_16);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		/* Set word lengths */
		regs->rcr2	|= RWDLEN2(OMAP_MCBSP_WORD_32);
		regs->rcr1	|= RWDLEN1(OMAP_MCBSP_WORD_32);
		regs->xcr2	|= XWDLEN2(OMAP_MCBSP_WORD_32);
		regs->xcr1	|= XWDLEN1(OMAP_MCBSP_WORD_32);
		break;
//.........这里部分代码省略.........

static int zylonite_voice_hw_params(struct snd_pcm_substream *substream,
                                    struct snd_pcm_hw_params *params)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;
    struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
    unsigned int pll_out = 0;
    unsigned int wm9713_div = 0;
    int ret = 0;
    int rate = params_rate(params);
    int width = snd_pcm_format_physical_width(params_format(params));

    /* Only support ratios that we can generate neatly from the AC97
     * based master clock - in particular, this excludes 44.1kHz.
     * In most applications the voice DAC will be used for telephony
     * data so multiples of 8kHz will be the common case.
     */
    switch (rate) {
    case 8000:
        wm9713_div = 12;
        break;
    case 16000:
        wm9713_div = 6;
        break;
    case 48000:
        wm9713_div = 2;
        break;
    default:
        /* Don't support OSS emulation */
        return -EINVAL;
    }

    /* Add 1 to the width for the leading clock cycle */
    pll_out = rate * (width + 1) * 8;

    ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_AUDIO, 0, 1);
    if (ret < 0)
        return ret;

    ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, pll_out);
    if (ret < 0)
        return ret;

    if (clk_pout)
        ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_PLL_DIV,
                                     WM9713_PCMDIV(wm9713_div));
    else
        ret = snd_soc_dai_set_clkdiv(codec_dai, WM9713_PCMCLK_DIV,
                                     WM9713_PCMDIV(wm9713_div));
    if (ret < 0)
        return ret;

    ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
                              SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
    if (ret < 0)
        return ret;

    ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_I2S |
                              SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
    if (ret < 0)
        return ret;

    return 0;
}

static int tegra_bt_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(rtd->cpu_dai);
#endif
	struct snd_soc_card *card = rtd->card;
	struct tegra_max98088 *machine = snd_soc_card_get_drvdata(card);
	int err, srate, mclk, min_mclk, sample_size;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		sample_size = 16;
		break;
	default:
		return -EINVAL;
	}

	srate = params_rate(params);
	switch (srate) {
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		mclk = 11289600;
		break;
	case 8000:
	case 16000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		mclk = 12288000;
		break;
	default:
		return -EINVAL;
	}
	min_mclk = 64 * srate;

	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
	if (err < 0) {
		if (!(machine->util_data.set_mclk % min_mclk))
			mclk = machine->util_data.set_mclk;
		else {
			dev_err(card->dev, "Can't configure clocks\n");
			return err;
		}
	}

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 1);

	err = snd_soc_dai_set_fmt(rtd->cpu_dai,
			SND_SOC_DAIFMT_DSP_A |
			SND_SOC_DAIFMT_NB_NF |
			SND_SOC_DAIFMT_CBS_CFS);
	if (err < 0) {
		dev_err(rtd->codec->card->dev, "cpu_dai fmt not set\n");
		return err;
	}

#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		tegra_max98088_set_dam_cif(i2s->dam_ifc, params_rate(params),
			params_channels(params), sample_size, 0, 0, 0, 0);
#endif

	return 0;
}

/**
 * Set default hardware params
 */
static int playback_prepare_params(struct gaudio_snd_dev *snd)
{
	struct snd_pcm_substream *substream = snd->substream;
	struct snd_pcm_hw_params *params;
	snd_pcm_sframes_t result;

       /*
	* SNDRV_PCM_ACCESS_RW_INTERLEAVED,
	* SNDRV_PCM_FORMAT_S16_LE
	* CHANNELS: 2
	* RATE: 8000
	*/
	snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
	snd->format = SNDRV_PCM_FORMAT_S16_LE;
	snd->channels = 2;
	snd->rate = 8000;

	params = kzalloc(sizeof(*params), GFP_KERNEL);
	if (!params)
		return -ENOMEM;

	_snd_pcm_hw_params_any(params);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
			snd->access, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
			snd->format, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
			snd->channels, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
			snd->rate, 0);

	result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
	if (result < 0)
		pr_err("SNDRV_PCM_IOCTL_DROP failed: %d\n", (int)result);

	result = snd_pcm_kernel_ioctl(substream,
			SNDRV_PCM_IOCTL_HW_PARAMS, params);
	if (result < 0) {
		pr_err("SNDRV_PCM_IOCTL_HW_PARAMS failed: %d\n", (int)result);
		kfree(params);
		return result;
	}

	result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
	if (result < 0)
		pr_err("Preparing playback failed: %d\n", (int)result);


	/* Store the hardware parameters */
	snd->access = params_access(params);
	snd->format = params_format(params);
	snd->channels = params_channels(params);
	snd->rate = params_rate(params);

	kfree(params);

	pr_debug("playback params: access %x, format %x, channels %d, rate %d\n",
		snd->access, snd->format, snd->channels, snd->rate);

	return 0;
}

static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
	struct i2s_clk_config_data *config = &dev->config;
	int ret;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		config->data_width = 16;
		dev->ccr = 0x00;
		dev->xfer_resolution = 0x02;
		break;

	case SNDRV_PCM_FORMAT_S24_LE:
		config->data_width = 24;
		dev->ccr = 0x08;
		dev->xfer_resolution = 0x04;
		break;

	case SNDRV_PCM_FORMAT_S32_LE:
		config->data_width = 32;
		dev->ccr = 0x10;
		dev->xfer_resolution = 0x05;
		break;

	default:
		dev_err(dev->dev, "designware-i2s: unsupported PCM fmt");
		return -EINVAL;
	}

	config->chan_nr = params_channels(params);

	switch (config->chan_nr) {
	case EIGHT_CHANNEL_SUPPORT:
	case SIX_CHANNEL_SUPPORT:
	case FOUR_CHANNEL_SUPPORT:
	case TWO_CHANNEL_SUPPORT:
		break;
	default:
		dev_err(dev->dev, "channel not supported\n");
		return -EINVAL;
	}

	dw_i2s_config(dev, substream->stream);

	i2s_write_reg(dev->i2s_base, CCR, dev->ccr);

	config->sample_rate = params_rate(params);

	if (dev->capability & DW_I2S_MASTER) {
		if (dev->i2s_clk_cfg) {
			ret = dev->i2s_clk_cfg(config);
			if (ret < 0) {
				dev_err(dev->dev, "runtime audio clk config fail\n");
				return ret;
			}
		} else {
			u32 bitclk = config->sample_rate *
					config->data_width * 2;

			ret = clk_set_rate(dev->clk, bitclk);
			if (ret) {
				dev_err(dev->dev, "Can't set I2S clock rate: %d\n",
					ret);
				return ret;
			}
		}
	}
	return 0;
}

static int tegra_max98088_hw_params(struct snd_pcm_substream *substream,
					struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct snd_soc_codec *codec = rtd->codec;
	struct snd_soc_card *card = codec->card;
	struct tegra_max98088 *machine = snd_soc_card_get_drvdata(card);
#ifndef CONFIG_ARCH_TEGRA_2x_SOC
	struct tegra30_i2s *i2s = snd_soc_dai_get_drvdata(cpu_dai);
#endif
	int srate, mclk, sample_size, i2s_daifmt;
	int err;
	struct clk *clk;
	int rate;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		sample_size = 16;
		break;
	default:
		return -EINVAL;
	}

	srate = params_rate(params);
	switch (srate) {
	case 8000:
	case 16000:
	case 24000:
	case 32000:
	case 48000:
	case 64000:
	case 96000:
		mclk = 12288000;
		break;
	case 11025:
	case 22050:
	case 44100:
	case 88200:
		mclk = 11289600;
		break;
	default:
		mclk = 12000000;
		break;
	}


#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
	clk = clk_get_sys(NULL, "cdev1");
#else
	clk = clk_get_sys("extern1", NULL);
#endif
	if (IS_ERR(clk)) {
		dev_err(card->dev, "Can't retrieve clk cdev1\n");
		err = PTR_ERR(clk);
		return err;
	}

	rate = clk_get_rate(clk);
	printk("extern1 rate=%d\n",rate);

#if TEGRA30_I2S_MASTER_PLAYBACK
	i2s_daifmt = SND_SOC_DAIFMT_I2S |
				SND_SOC_DAIFMT_NB_NF |
				SND_SOC_DAIFMT_CBS_CFS;
#else
	i2s_daifmt = SND_SOC_DAIFMT_I2S |
				SND_SOC_DAIFMT_NB_NF |
				SND_SOC_DAIFMT_CBM_CFM;
	mclk = rate;
#endif

	err = tegra_asoc_utils_set_rate(&machine->util_data, srate, mclk);
	if (err < 0) {
		if (!(machine->util_data.set_mclk % mclk))
			mclk = machine->util_data.set_mclk;
		else {
			dev_err(card->dev, "Can't configure clocks\n");
			return err;
		}
	}

	tegra_asoc_utils_lock_clk_rate(&machine->util_data, 1);

	err = snd_soc_dai_set_fmt(codec_dai,i2s_daifmt);
	if (err < 0) {
		dev_err(card->dev, "codec_dai fmt not set\n");
		return err;
	}

	err = snd_soc_dai_set_fmt(cpu_dai, i2s_daifmt);
	if (err < 0) {
		dev_err(card->dev, "cpu_dai fmt not set\n");
		return err;
	}

	err = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
					SND_SOC_CLOCK_IN);
	if (err < 0) {
//.........这里部分代码省略.........

static int arizona_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct arizona_priv *priv = snd_soc_codec_get_drvdata(codec);
	struct arizona_dai_priv *dai_priv = &priv->dai[dai->id - 1];
	int base = dai->driver->base;
	const int *rates;
	int i;
	int bclk, lrclk, wl, frame, sr_val;

	if (params_rate(params) % 8000)
		rates = &arizona_44k1_bclk_rates[0];
	else
		rates = &arizona_48k_bclk_rates[0];

	for (i = 0; i < ARRAY_SIZE(arizona_44k1_bclk_rates); i++) {
		if (rates[i] >= snd_soc_params_to_bclk(params) &&
		    rates[i] % params_rate(params) == 0) {
			bclk = i;
			break;
		}
	}
	if (i == ARRAY_SIZE(arizona_44k1_bclk_rates)) {
		arizona_aif_err(dai, "Unsupported sample rate %dHz\n",
				params_rate(params));
		return -EINVAL;
	}

	for (i = 0; i < ARRAY_SIZE(arizona_sr_vals); i++)
		if (arizona_sr_vals[i] == params_rate(params))
			break;
	if (i == ARRAY_SIZE(arizona_sr_vals)) {
		arizona_aif_err(dai, "Unsupported sample rate %dHz\n",
				params_rate(params));
		return -EINVAL;
	}
	sr_val = i;

	lrclk = rates[bclk] / params_rate(params);

	arizona_aif_dbg(dai, "BCLK %dHz LRCLK %dHz\n",
			rates[bclk], rates[bclk] / lrclk);

	wl = snd_pcm_format_width(params_format(params));
	frame = wl << ARIZONA_AIF1TX_WL_SHIFT | wl;

	/*
	 * We will need to be more flexible than this in future,
	 * currently we use a single sample rate for SYSCLK.
	 */
	switch (dai_priv->clk) {
	case ARIZONA_CLK_SYSCLK:
		snd_soc_update_bits(codec, ARIZONA_SAMPLE_RATE_1,
				    ARIZONA_SAMPLE_RATE_1_MASK, sr_val);
		snd_soc_update_bits(codec, base + ARIZONA_AIF_RATE_CTRL,
				    ARIZONA_AIF1_RATE_MASK, 0);
		break;
	case ARIZONA_CLK_ASYNCCLK:
		snd_soc_update_bits(codec, ARIZONA_ASYNC_SAMPLE_RATE_1,
				    ARIZONA_ASYNC_SAMPLE_RATE_MASK, sr_val);
		snd_soc_update_bits(codec, base + ARIZONA_AIF_RATE_CTRL,
				    ARIZONA_AIF1_RATE_MASK,
				    8 << ARIZONA_AIF1_RATE_SHIFT);
		break;
	default:
		arizona_aif_err(dai, "Invalid clock %d\n", dai_priv->clk);
		return -EINVAL;
	}

	snd_soc_update_bits(codec, base + ARIZONA_AIF_BCLK_CTRL,
			    ARIZONA_AIF1_BCLK_FREQ_MASK, bclk);
	snd_soc_update_bits(codec, base + ARIZONA_AIF_TX_BCLK_RATE,
			    ARIZONA_AIF1TX_BCPF_MASK, lrclk);
	snd_soc_update_bits(codec, base + ARIZONA_AIF_RX_BCLK_RATE,
			    ARIZONA_AIF1RX_BCPF_MASK, lrclk);
	snd_soc_update_bits(codec, base + ARIZONA_AIF_FRAME_CTRL_1,
			    ARIZONA_AIF1TX_WL_MASK |
			    ARIZONA_AIF1TX_SLOT_LEN_MASK, frame);
	snd_soc_update_bits(codec, base + ARIZONA_AIF_FRAME_CTRL_2,
			    ARIZONA_AIF1RX_WL_MASK |
			    ARIZONA_AIF1RX_SLOT_LEN_MASK, frame);

	return 0;
}

static int lpass_cpu_daiops_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
	snd_pcm_format_t format = params_format(params);
	unsigned int channels = params_channels(params);
	unsigned int rate = params_rate(params);
	unsigned int regval;
	int bitwidth, ret;

	bitwidth = snd_pcm_format_width(format);
	if (bitwidth < 0) {
		dev_err(dai->dev, "%s() invalid bit width given: %d\n",
				__func__, bitwidth);
		return bitwidth;
	}

	regval = LPAIF_I2SCTL_LOOPBACK_DISABLE |
			LPAIF_I2SCTL_WSSRC_INTERNAL;

	switch (bitwidth) {
	case 16:
		regval |= LPAIF_I2SCTL_BITWIDTH_16;
		break;
	case 24:
		regval |= LPAIF_I2SCTL_BITWIDTH_24;
		break;
	case 32:
		regval |= LPAIF_I2SCTL_BITWIDTH_32;
		break;
	default:
		dev_err(dai->dev, "%s() invalid bitwidth given: %d\n",
				__func__, bitwidth);
		return -EINVAL;
	}

	switch (channels) {
	case 1:
		regval |= LPAIF_I2SCTL_SPKMODE_SD0;
		regval |= LPAIF_I2SCTL_SPKMONO_MONO;
		break;
	case 2:
		regval |= LPAIF_I2SCTL_SPKMODE_SD0;
		regval |= LPAIF_I2SCTL_SPKMONO_STEREO;
		break;
	case 4:
		regval |= LPAIF_I2SCTL_SPKMODE_QUAD01;
		regval |= LPAIF_I2SCTL_SPKMONO_STEREO;
		break;
	case 6:
		regval |= LPAIF_I2SCTL_SPKMODE_6CH;
		regval |= LPAIF_I2SCTL_SPKMONO_STEREO;
		break;
	case 8:
		regval |= LPAIF_I2SCTL_SPKMODE_8CH;
		regval |= LPAIF_I2SCTL_SPKMONO_STEREO;
		break;
	default:
		dev_err(dai->dev, "%s() invalid channels given: %u\n",
				__func__, channels);
		return -EINVAL;
	}

	ret = regmap_write(drvdata->lpaif_map,
			   LPAIF_I2SCTL_REG(drvdata->variant, dai->driver->id),
			   regval);
	if (ret) {
		dev_err(dai->dev, "%s() error writing to i2sctl reg: %d\n",
				__func__, ret);
		return ret;
	}

	ret = clk_set_rate(drvdata->mi2s_bit_clk[dai->driver->id],
			   rate * bitwidth * 2);
	if (ret) {
		dev_err(dai->dev, "%s() error setting mi2s bitclk to %u: %d\n",
				__func__, rate * bitwidth * 2, ret);
		return ret;
	}

	return 0;
}

static int wm8776_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);
	int iface_reg, iface;
	int ratio_shift, master;
	int i;

	switch (dai->driver->id) {
	case WM8776_DAI_DAC:
		iface_reg = WM8776_DACIFCTRL;
		master = 0x80;
		ratio_shift = 4;
		break;
	case WM8776_DAI_ADC:
		iface_reg = WM8776_ADCIFCTRL;
		master = 0x100;
		ratio_shift = 0;
		break;
	default:
		return -EINVAL;
	}

	/* Set word length */
	switch (snd_pcm_format_width(params_format(params))) {
	case 16:
		iface = 0;
		break;
	case 20:
		iface = 0x10;
		break;
	case 24:
		iface = 0x20;
		break;
	case 32:
		iface = 0x30;
		break;
	default:
		dev_err(codec->dev, "Unsupported sample size: %i\n",
			snd_pcm_format_width(params_format(params)));
		return -EINVAL;
	}

	/* Only need to set MCLK/LRCLK ratio if we're master */
	if (snd_soc_read(codec, WM8776_MSTRCTRL) & master) {
		for (i = 0; i < ARRAY_SIZE(mclk_ratios); i++) {
			if (wm8776->sysclk[dai->driver->id] / params_rate(params)
			    == mclk_ratios[i])
				break;
		}

		if (i == ARRAY_SIZE(mclk_ratios)) {
			dev_err(codec->dev,
				"Unable to configure MCLK ratio %d/%d\n",
				wm8776->sysclk[dai->driver->id], params_rate(params));
			return -EINVAL;
		}

		dev_dbg(codec->dev, "MCLK is %dfs\n", mclk_ratios[i]);

		snd_soc_update_bits(codec, WM8776_MSTRCTRL,
				    0x7 << ratio_shift, i << ratio_shift);
	} else {
		dev_dbg(codec->dev, "DAI in slave mode\n");
	}

	snd_soc_update_bits(codec, iface_reg, 0x30, iface);

	return 0;
}

	/* Switch the FLL */
	ret = snd_soc_dai_set_pll(codec_dai, WM8994_FLL1,
				  WM8994_FLL_SRC_MCLK1, MIDAS_DEFAULT_MCLK1,
				  pll_out);
	if (ret < 0)
		dev_err(codec_dai->dev, "Unable to start FLL1: %d\n", ret);

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8994_SYSCLK_FLL1,
				     pll_out, SND_SOC_CLOCK_IN);
	if (ret < 0) {
		dev_err(codec_dai->dev, "Unable to switch to FLL1: %d\n", ret);
		return ret;
	}

	ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK,
				     0, MOD_OPCLK_PCLK);
	if (ret < 0)
		return ret;
#else
	midas_start_fll1(codec_dai);
#endif

	if (ret < 0)
		return ret;

	dev_info(codec_dai->dev, "%s --\n", __func__);

	return 0;
}
#else /* CONFIG_SND_SAMSUNG_I2S_MASTER */
static int midas_wm1811_aif1_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *codec_dai = rtd->codec_dai;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	int bfs, psr, rfs, ret;
	unsigned long rclk;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_U24:
	case SNDRV_PCM_FORMAT_S24:
		bfs = 48;
		break;
	case SNDRV_PCM_FORMAT_U16_LE:
	case SNDRV_PCM_FORMAT_S16_LE:
		bfs = 32;
		break;
	default:
		return -EINVAL;
	}

	switch (params_rate(params)) {
	case 16000:
	case 22050:
	case 24000:
	case 32000:
	case 44100:
	case 48000:
	case 88200:
	case 96000:
		if (bfs == 48)
			rfs = 384;
		else
			rfs = 256;
		break;
	case 64000:
		rfs = 384;
		break;
	case 8000:
	case 11025:
	case 12000:
		if (bfs == 48)
			rfs = 768;
		else
			rfs = 512;
		break;
	default:
		return -EINVAL;
	}

	rclk = params_rate(params) * rfs;

	switch (rclk) {
	case 4096000:
	case 5644800:
	case 6144000:
	case 8467200:
	case 9216000:
		psr = 8;
		break;
	case 8192000:
	case 11289600:
	case 12288000:
	case 16934400:
	case 18432000:
		psr = 4;
		break;
	case 22579200:
	case 24576000:
//.........这里部分代码省略.........

static int capture_prepare_params(struct gaudio_snd_dev *snd)
{
	struct snd_pcm_substream *substream = snd->substream;
	struct snd_pcm_runtime   *runtime = substream->runtime;
	struct snd_pcm_hw_params *params;
	struct snd_pcm_sw_params *swparams;
	unsigned long period_size;
	unsigned long buffer_size;
	snd_pcm_sframes_t result = 0;

	/*
	 * SNDRV_PCM_ACCESS_RW_INTERLEAVED,
	 * SNDRV_PCM_FORMAT_S16_LE
	 * CHANNELS: 1
	 * RATE: 8000
	 */
	snd->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
	snd->format = SNDRV_PCM_FORMAT_S16_LE;
	snd->channels = 1;
	snd->rate = 8000;

	params = kzalloc(sizeof(*params), GFP_KERNEL);
	if (!params) {
		pr_err("Failed to allocate hw params");
		return -ENOMEM;
	}

	_snd_pcm_hw_params_any(params);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,
			snd->access, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,
			snd->format, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
			snd->channels, 0);
	_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
			snd->rate, 0);

	result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
	if (result < 0)
		pr_err("SNDRV_PCM_IOCTL_DROP failed: %d\n", (int)result);

	result = snd_pcm_kernel_ioctl(substream,
			SNDRV_PCM_IOCTL_HW_PARAMS, params);
	if (result < 0) {
		pr_err("SNDRV_PCM_IOCTL_HW_PARAMS failed: %d\n", (int)result);
		kfree(params);
		return result;
	}

	result = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE,
					NULL);
	if (result < 0)
		pr_err("Preparing capture failed: %d\n", (int)result);

	/* Store the hardware parameters */
	snd->access = params_access(params);
	snd->format = params_format(params);
	snd->channels = params_channels(params);
	snd->rate = params_rate(params);

	runtime->frame_bits = snd_pcm_format_physical_width(runtime->format);
	/*Fix the issue:Passing freed pointer "params" as an argument to function "pcm_buffer_size"*/
	buffer_size = pcm_buffer_size(params);
	period_size = pcm_period_size(params);
	kfree(params);

	swparams = kzalloc(sizeof(*swparams), GFP_KERNEL);
	if (!swparams) {
		pr_err("Failed to allocate sw params");
		return -ENOMEM;
	}

	swparams->avail_min = period_size/2;
	swparams->xfer_align = period_size/2;

	swparams->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
	swparams->period_step = 1;
	swparams->start_threshold = 1;
	swparams->stop_threshold = INT_MAX;
	swparams->silence_size = 0;
	swparams->silence_threshold = 0;

	result = snd_pcm_kernel_ioctl(substream,
			SNDRV_PCM_IOCTL_SW_PARAMS, swparams);
	if (result < 0)
		pr_err("SNDRV_PCM_IOCTL_SW_PARAMS failed: %d\n", (int)result);

	kfree(swparams);

	pr_debug("capture params: access %x, format %x, channels %d, rate %d\n",
		snd->access, snd->format, snd->channels, snd->rate);

	return result;
}