C++ snd_pcm_hw_constraint_minmax函数代码示例

static int wl1273_startup(struct snd_pcm_substream *substream,
			  struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);

	switch (wl1273->mode) {
	case WL1273_MODE_BT:
		snd_pcm_hw_constraint_minmax(substream->runtime,
					     SNDRV_PCM_HW_PARAM_RATE,
					     8000, 8000);
		snd_pcm_hw_constraint_minmax(substream->runtime,
					     SNDRV_PCM_HW_PARAM_CHANNELS, 1, 1);
		break;
	case WL1273_MODE_FM_RX:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			pr_err("Cannot play in RX mode.\n");
			return -EINVAL;
		}
		break;
	case WL1273_MODE_FM_TX:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
			pr_err("Cannot capture in TX mode.\n");
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
		break;
	}

	return 0;
}

static int bcm947xx_pcm_set_constraints(struct snd_pcm_runtime *runtime,
	bcm947xx_i2s_info_t *snd_bcm)
{
	int ret;

	/* rate */
	if ((ret = snd_pcm_hw_constraint_minmax(runtime,
					SNDRV_PCM_HW_PARAM_RATE, snd_bcm->rate, snd_bcm->rate)) < 0)
	{
		DBG("%s SNDRV_PCM_HW_PARAM_RATE failed rate=%d\n", __FUNCTION__, snd_bcm->rate);
		goto err;
	}
	/* channels */
	if ((ret = snd_pcm_hw_constraint_minmax(runtime,
					SNDRV_PCM_HW_PARAM_CHANNELS, snd_bcm->channels, snd_bcm->channels)) < 0)
	{
		DBG("%s SNDRV_PCM_HW_PARAM_CHANNELS failed channels=%d\n", __FUNCTION__, snd_bcm->channels);
		goto err;
	}
	/* width */
	if ((ret = snd_pcm_hw_constraint_minmax(runtime,
					SNDRV_PCM_HW_PARAM_SAMPLE_BITS, snd_bcm->sample_bits, snd_bcm->sample_bits)) < 0)
	{
		DBG("%s SNDRV_PCM_HW_PARAM_SAMPLE_BITS failed bits=%d\n", __FUNCTION__, snd_bcm->sample_bits);
		goto err;
	}

err:
	if (ret < 0)
		DBG("%s return with error %d\n", __FUNCTION__, ret);

	return ret;
}

static int uda134x_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct uda134x_priv *uda134x = snd_soc_codec_get_drvdata(codec);
	struct snd_pcm_runtime *master_runtime;

	if (uda134x->master_substream) {
		master_runtime = uda134x->master_substream->runtime;

		pr_debug("%s constraining to %d bits at %d\n", __func__,
			 master_runtime->sample_bits,
			 master_runtime->rate);

		snd_pcm_hw_constraint_minmax(substream->runtime,
					     SNDRV_PCM_HW_PARAM_RATE,
					     master_runtime->rate,
					     master_runtime->rate);

		snd_pcm_hw_constraint_minmax(substream->runtime,
					     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
					     master_runtime->sample_bits,
					     master_runtime->sample_bits);

		uda134x->slave_substream = substream;
	} else
		uda134x->master_substream = substream;

	return 0;
}

static int lx_pcm_open(struct snd_pcm_substream *substream)
{
	struct lx6464es *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err = 0;
	int board_rate;

	snd_printdd("->lx_pcm_open\n");
	mutex_lock(&chip->setup_mutex);

	/* copy the struct snd_pcm_hardware struct */
	runtime->hw = lx_caps;

#if 0
	/* buffer-size should better be multiple of period-size */
	err = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0) {
		snd_printk(KERN_WARNING LXP "could not constrain periods\n");
		goto exit;
	}
#endif

	/* the clock rate cannot be changed */
	board_rate = chip->board_sample_rate;
	err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
					   board_rate, board_rate);

	if (err < 0) {
		snd_printk(KERN_WARNING LXP "could not constrain periods\n");
		goto exit;
	}

	/* constrain period size */
	err = snd_pcm_hw_constraint_minmax(runtime,
					   SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
					   MICROBLAZE_IBL_MIN,
					   MICROBLAZE_IBL_MAX);
	if (err < 0) {
		snd_printk(KERN_WARNING LXP
			   "could not constrain period size\n");
		goto exit;
	}

	snd_pcm_hw_constraint_step(runtime, 0,
				   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32);

	snd_pcm_set_sync(substream);
	err = 0;

exit:
	runtime->private_data = chip;

	mutex_unlock(&chip->setup_mutex);
	snd_printdd("<-lx_pcm_open, %d\n", err);
	return err;
}

static int aic3008_dai_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_codec *codec = rtd->codec;
	struct aic3008_priv *aic3008 = snd_soc_codec_get_drvdata(codec);
	struct spi_device *spi = codec->control_data;
	struct snd_pcm_runtime *master_runtime;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		aic3008->playback_active++;
	else
		aic3008->capture_active++;

	/* The DAI has shared clocks so if we already have a playback or
	 * capture going then constrain this substream to match it.
	 */
	if (aic3008->master_substream) {
		master_runtime = aic3008->master_substream->runtime;

		/* dev_dbg(&spi->dev, "Constraining to %d bits\n",
		 master_runtime->sample_bits); */
		AUD_DBG("%p Constraining to %d bits\n", &spi->dev,
				master_runtime->sample_bits);

		snd_pcm_hw_constraint_minmax(substream->runtime,
				SNDRV_PCM_HW_PARAM_SAMPLE_BITS, master_runtime->sample_bits,
				master_runtime->sample_bits);

		aic3008->slave_substream = substream;
	} else
		aic3008->master_substream = substream;

	return 0;
}

static int wm8903_startup(struct snd_pcm_substream *substream,
			  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 wm8903_priv *wm8903 = codec->private_data;
	struct i2c_client *i2c = codec->control_data;
	struct snd_pcm_runtime *master_runtime;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		wm8903->playback_active++;
	else
		wm8903->capture_active++;

	/* The DAI has shared clocks so if we already have a playback or
	 * capture going then constrain this substream to match it.
	 */
	if (wm8903->master_substream) {
		master_runtime = wm8903->master_substream->runtime;

		dev_dbg(&i2c->dev, "Constraining to %d bits\n",
			master_runtime->sample_bits);

		snd_pcm_hw_constraint_minmax(substream->runtime,
					     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
					     master_runtime->sample_bits,
					     master_runtime->sample_bits);

		wm8903->slave_substream = substream;
	} else
		wm8903->master_substream = substream;

	return 0;
}

static int adau1977_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct adau1977 *adau1977 = snd_soc_codec_get_drvdata(dai->codec);
	u64 formats = 0;

	if (adau1977->slot_width == 16)
		formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE;
	else if (adau1977->right_j || adau1977->slot_width == 24)
		formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE;

	snd_pcm_hw_constraint_list(substream->runtime, 0,
		SNDRV_PCM_HW_PARAM_RATE, &adau1977->constraints);

	if (adau1977->master)
		snd_pcm_hw_constraint_minmax(substream->runtime,
			SNDRV_PCM_HW_PARAM_RATE, 8000, adau1977->max_master_fs);

	if (formats != 0)
		snd_pcm_hw_constraint_mask64(substream->runtime,
			SNDRV_PCM_HW_PARAM_FORMAT, formats);

	return 0;
}

/* refine sample-rate based on HDMI source */
static int tda1997x_pcm_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct snd_pcm_runtime *rtd = substream->runtime;
        tda1997x_audout_fmt_t fmt;
	int rate, ret;

        ret = tda1997x_get_audout_fmt(&fmt);
	if (ret) {
		dev_err(codec->dev, "failed to obtain tda1997x info: %d\n",
			ret);
		return -EIO;
	}
	rate = fmt.samplerate;

	ret = snd_pcm_hw_constraint_minmax(rtd, SNDRV_PCM_HW_PARAM_RATE,
					   rate, rate);
	if (ret > 0)
		dev_info(codec->dev, "set samplerate constraint to %dHz\n",
			 rate);
	else
		dev_err(codec->dev, "failed to set samplerate constraint "
			"to %dHz: %d\n", rate, ret);

	return 0;
}

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

	pr_debug("%s\n", __func__);
	prtd = kzalloc(sizeof(struct lsm_priv), GFP_KERNEL);
	if (!prtd) {
		pr_err("%s: Failed to allocate memory for lsm_priv\n",
		       __func__);
		return -ENOMEM;
	}
	spin_lock_init(&prtd->event_lock);
	init_waitqueue_head(&prtd->event_wait);
	prtd->substream = substream;
	runtime->private_data = prtd;
	runtime->hw = msm_pcm_hardware_capture;

	ret = snd_pcm_hw_constraint_list(runtime, 0,
				SNDRV_PCM_HW_PARAM_RATE,
				&constraints_sample_rates);
	if (ret < 0)
		pr_info("%s: snd_pcm_hw_constraint_list failed ret %d\n",
			 __func__, ret);
	/* Ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
			    SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
		pr_info("%s: snd_pcm_hw_constraint_integer failed ret %d\n",
			__func__, ret);

	ret = snd_pcm_hw_constraint_minmax(runtime,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
		CAPTURE_MIN_NUM_PERIODS * CAPTURE_MIN_PERIOD_SIZE,
		CAPTURE_MAX_NUM_PERIODS * CAPTURE_MAX_PERIOD_SIZE);
	if (ret < 0)
		pr_info("%s: constraint for buffer bytes min max ret = %d\n",
			__func__, ret);
	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (ret < 0) {
		pr_info("%s: constraint for period bytes step ret = %d\n",
			__func__, ret);
	}
	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (ret < 0)
		pr_info("%s: constraint for buffer bytes step ret = %d\n",
			__func__, ret);
	prtd->lsm_client = q6lsm_client_alloc(
				(lsm_app_cb)lsm_event_handler, prtd);
	if (!prtd->lsm_client) {
		pr_err("%s: Could not allocate memory\n", __func__);
		kfree(prtd);
		runtime->private_data = NULL;
		return -ENOMEM;
	}
	return 0;
}

static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,
			 unsigned int channels)
{
	int err;

	substream->runtime->hw.info =
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_BATCH |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_FIFO_IN_FRAMES;
	substream->runtime->hw.formats = ua->format_bit;
	substream->runtime->hw.rates = snd_pcm_rate_to_rate_bit(ua->rate);
	substream->runtime->hw.rate_min = ua->rate;
	substream->runtime->hw.rate_max = ua->rate;
	substream->runtime->hw.channels_min = channels;
	substream->runtime->hw.channels_max = channels;
	substream->runtime->hw.buffer_bytes_max = 45000 * 1024;
	substream->runtime->hw.period_bytes_min = 1;
	substream->runtime->hw.period_bytes_max = UINT_MAX;
	substream->runtime->hw.periods_min = 2;
	substream->runtime->hw.periods_max = UINT_MAX;
	err = snd_pcm_hw_constraint_minmax(substream->runtime,
					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
					   1500000 / ua->packets_per_second,
					   UINT_MAX);
	if (err < 0)
		return err;
	err = snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
	return err;
}

static int emu10k1_playback_constraints(struct snd_pcm_runtime *runtime)
{
	int err;
	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
		return err;
	if ((err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 256, UINT_MAX)) < 0)
		return err;
	return 0;
}

static void skl_set_pcm_constrains(struct hdac_ext_bus *ebus,
				 struct snd_pcm_runtime *runtime)
{
	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);

	/* avoid wrap-around with wall-clock */
	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
				     20, 178000000);
}

static int n810_startup(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	snd_pcm_hw_constraint_minmax(runtime,
				     SNDRV_PCM_HW_PARAM_CHANNELS, 2, 2);

	n810_ext_control(&rtd->card->dapm);
	return clk_prepare_enable(sys_clkout2);
}

static int ssm2602_startup(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct ssm2602_priv *ssm2602 = snd_soc_codec_get_drvdata(codec);
	struct snd_pcm_runtime *master_runtime;

	/* The DAI has shared clocks so if we already have a playback or
	 * capture going then constrain this substream to match it.
	 * TODO: the ssm2602 allows pairs of non-matching PB/REC rates
	 */
	if (ssm2602->master_substream) {
		master_runtime = ssm2602->master_substream->runtime;
		dev_dbg(codec->dev, "Constraining to %d bits at %dHz\n",
			master_runtime->sample_bits,
			master_runtime->rate);

		if (master_runtime->rate != 0)
			snd_pcm_hw_constraint_minmax(substream->runtime,
						     SNDRV_PCM_HW_PARAM_RATE,
						     master_runtime->rate,
						     master_runtime->rate);

		if (master_runtime->sample_bits != 0)
			snd_pcm_hw_constraint_minmax(substream->runtime,
						     SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
						     master_runtime->sample_bits,
						     master_runtime->sample_bits);

		ssm2602->slave_substream = substream;
	} else
		ssm2602->master_substream = substream;

	if (ssm2602->sysclk_constraints) {
		snd_pcm_hw_constraint_list(substream->runtime, 0,
				   SNDRV_PCM_HW_PARAM_RATE,
				   ssm2602->sysclk_constraints);
	}

	return 0;
}

static int ux500_msp_dai_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct snd_soc_dai *dai)
{
	unsigned int mask, slots_active;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct ux500_msp_i2s_drvdata *drvdata = dev_get_drvdata(dai->dev);

	dev_dbg(dai->dev, "%s: MSP %d (%s): Enter.\n",
			__func__, dai->id, snd_pcm_stream_str(substream));

	switch (drvdata->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		snd_pcm_hw_constraint_minmax(runtime,
				SNDRV_PCM_HW_PARAM_CHANNELS,
				1, 2);
		break;

	case SND_SOC_DAIFMT_DSP_B:
	case SND_SOC_DAIFMT_DSP_A:
		mask = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
			drvdata->tx_mask :
			drvdata->rx_mask;

		slots_active = hweight32(mask);
		dev_dbg(dai->dev, "TDM-slots active: %d", slots_active);

		snd_pcm_hw_constraint_minmax(runtime,
				SNDRV_PCM_HW_PARAM_CHANNELS,
				slots_active, slots_active);
		break;

	default:
		dev_err(dai->dev,
			"%s: Error: Unsupported protocol (fmt = 0x%x)!\n",
			__func__, drvdata->fmt);
		return -EINVAL;
	}

	return 0;
}