C++ params_period_bytes函数代码示例

static int s3c_idma_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct lpam_i2s_pdata *prtd = substream->runtime->private_data;
	unsigned long idma_totbytes;

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

	idma_totbytes = params_buffer_bytes(params);
	prtd->end = LP_TXBUFF_ADDR + idma_totbytes;
	prtd->period = params_periods(params);
	s3c_idma.dma_end    = prtd->end;
	s3c_idma.period_val = prtd->period;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	memset(runtime->dma_area, 0, LP_BUFSIZE);

	runtime->dma_bytes = idma_totbytes;

	s3c_idma_setcallbk(s3c_idma_done, params_period_bytes(params));

	prtd->start = runtime->dma_addr;
	prtd->pos = prtd->start;
	prtd->end = prtd->start + idma_totbytes;

	printk("[email protected]%x Total=%lubytes PrdSz=%u #Prds=%u\n",
			prtd->start, idma_totbytes, params_period_bytes(params), prtd->period);

	return 0;
}

/*--------------------------------------------------------------------------*\
 * PCM operations
\*--------------------------------------------------------------------------*/
static int atmel_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct atmel_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	/* this may get called several times by oss emulation
	 * with different params */

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	prtd->params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	prtd->params->dma_intr_handler = atmel_pcm_dma_irq;

	prtd->dma_buffer = runtime->dma_addr;
	prtd->dma_buffer_end = runtime->dma_addr + runtime->dma_bytes;
	prtd->period_size = params_period_bytes(params);

	pr_debug("atmel-pcm: "
		"hw_params: DMA for %s initialized "
		"(dma_bytes=%u, period_size=%u)\n",
		prtd->params->name,
		runtime->dma_bytes,
		prtd->period_size);
	return 0;
}

int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_pcm_dma_params * dmap;
	int i;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	/* Limit dma_req_count to period count */
	if (prtd->dma_req_count > params_periods(params))
		prtd->dma_req_count = params_periods(params);
	dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (dmap) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			for (i = 0; i < prtd->dma_req_count; i++)
				setup_dma_tx_request(&prtd->dma_req[i], dmap);
		} else {
			for (i = 0; i < prtd->dma_req_count; i++)
				setup_dma_rx_request(&prtd->dma_req[i], dmap);
		}
	}
	for (i = 0; i < prtd->dma_req_count; i++)
		prtd->dma_req[i].size = params_period_bytes(params);

	return 0;
}

/* common PCM hw_params callback */
int snd_line6_hw_params(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *hw_params)
{
	int ret;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	mutex_lock(&line6pcm->state_mutex);
	ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
	                           LINE6_STREAM_PCM);
	if (ret < 0)
		goto error;

	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0) {
		line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
		goto error;
	}

	pstr->period = params_period_bytes(hw_params);
 error:
	mutex_unlock(&line6pcm->state_mutex);
	return ret;
}

static int hi3620_digital_hw_params(struct snd_pcm_substream *substream,
        struct snd_pcm_hw_params *params)
{
    unsigned long bytes = params_buffer_bytes(params);
    struct hi3620_runtime_data *prtd = substream->runtime->private_data;
    int ret = 0;

    logd("%s entry : %s\n", __FUNCTION__,
            substream->stream == SNDRV_PCM_STREAM_PLAYBACK
            ? "PLAYBACK" : "CAPTURE");

    ret = snd_pcm_lib_malloc_pages(substream, bytes);
    if ( ret < 0 ) {
        loge("snd_pcm_lib_malloc_pages ret : %d\n", ret);
        return ret;
    }
    prtd->period_size = params_period_bytes(params);
    prtd->period_next = 0;

    /* PLAYBACK */
    if (SNDRV_PCM_STREAM_PLAYBACK == substream->stream) {
        ret = hi3620_digital_init_txs(substream->runtime, params);
        if ( ret < 0 ) {
            loge("hi3620_digital_init_txs ret : %d\n", ret);
            snd_pcm_lib_free_pages(substream);
            return ret;
        }
    }

    OUT_FUNCTION;

    return ret;
}

static int idma_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct idma_ctrl *prtd = substream->runtime->private_data;
	u32 ahb = readl(idma.regs + I2SAHB);

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

	ahb |= (AHB_DMARLD | AHB_INTMASK);
	writel(ahb, idma.regs + I2SAHB);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);
	memset(runtime->dma_area, 0, runtime->dma_bytes);

	prtd->start = prtd->pos = runtime->dma_addr;
	prtd->period = params_periods(params);
	prtd->periodsz = params_period_bytes(params);
	prtd->end = prtd->start + runtime->dma_bytes;

	idma_setcallbk(substream, idma_done);
#ifndef PRODUCT_SHIP
	pr_info("I:%s:[email protected]%x Total=%d PrdSz=%d #Prds=%d dma_area=0x%x\n",
		(substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? "P" : "C",
		prtd->start, runtime->dma_bytes, prtd->periodsz,
		prtd->period, (unsigned int)runtime->dma_area);
#endif

	return 0;
}

static int s3c_pcm_hw_params_lp(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned long totbytes = params_buffer_bytes(params);

	s3cdbg("Entered %s\n", __FUNCTION__);

	if(totbytes != MAX_LP_BUFF){
		s3cdbg("Use full buffer(128KB) in lowpower playback mode!");
		return -EINVAL;
	}

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = totbytes;

	/* We configure callback at partial playback complete acc to dutycyle selected */
	s3ci2s_func->dma_setcallbk(pcm_dmaupdate, LP_DMA_PERIOD);
	s3ci2s_func->dma_enqueue((void *)substream); /* Configure to loop the whole buffer */

	s3cdbg("[email protected]%x Total=%lubytes PrdSz=%u #Prds=%u\n",
				runtime->dma_addr, totbytes, 
				params_period_bytes(params), runtime->hw.periods_min);

	return 0;
}

static int psc_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 psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	u32 mode;

	dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
		" periods=%i buffer_size=%i  buffer_bytes=%i\n",
		__func__, substream, params_period_size(params),
		params_period_bytes(params), params_periods(params),
		params_buffer_size(params), params_buffer_bytes(params));

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
		break;
	case SNDRV_PCM_FORMAT_S16_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
		break;
	case SNDRV_PCM_FORMAT_S24_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
		break;
	case SNDRV_PCM_FORMAT_S32_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
		break;
	default:
		dev_dbg(psc_dma->dev, "invalid format\n");
		return -EINVAL;
	}
	out_be32(&psc_dma->psc_regs->sicr, psc_dma->sicr | mode);

	return 0;
}

static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct tegra_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct tegra_pcm_dma_params * dmap;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	dmap = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
	if (dmap) {
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
			setup_dma_tx_request(&prtd->dma_req[0], dmap);
			setup_dma_tx_request(&prtd->dma_req[1], dmap);
		} else {
			setup_dma_rx_request(&prtd->dma_req[0], dmap);
			setup_dma_rx_request(&prtd->dma_req[1], dmap);
		}
	}
	prtd->dma_req[0].size = params_period_bytes(params);
	prtd->dma_req[1].size = prtd->dma_req[0].size;

	return 0;
}

static int nusmart_pcm_hw_params(struct snd_pcm_substream *substream,
                                 struct snd_pcm_hw_params *params)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct nusmart_runtime_data *rtd_prv = runtime->private_data;
    size_t totsize = params_buffer_bytes(params);

    snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
    runtime->dma_bytes = totsize;

    rtd_prv->rcv_bytes_count = 0;
    rtd_prv->tran_bytes_count = 0;
    rtd_prv->rate = params_rate(params);
    rtd_prv->fmt = params_format(params);

    DBG_PRINT("buffer_bytes  = 0x%x, perd_bytes = 0x%x, perd_size = %d, ch = %d, fmt = %d, rate = %d \n",
              params_buffer_bytes(params),
              params_period_bytes(params),
              params_period_size(params),
              params_channels(params),
              params_format(params),
              params_rate(params)
             );
    return 0;
}

static int idma_hw_params(struct snd_pcm_substream *substream,
                          struct snd_pcm_hw_params *params)
{
    struct snd_pcm_runtime *runtime = substream->runtime;
    struct idma_ctrl *prtd = substream->runtime->private_data;
    u32 mod = readl(idma.regs + I2SMOD);
    u32 ahb = readl(idma.regs + I2SAHB);

    ahb |= (AHB_DMARLD | AHB_INTMASK);
    mod |= MOD_TXS_IDMA;
    writel(ahb, idma.regs + I2SAHB);
    writel(mod, idma.regs + I2SMOD);

    snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
    runtime->dma_bytes = params_buffer_bytes(params);

    prtd->start = prtd->pos = runtime->dma_addr;
    prtd->period = params_periods(params);
    prtd->periodsz = params_period_bytes(params);
    prtd->end = runtime->dma_addr + runtime->dma_bytes;

    idma_setcallbk(substream, idma_done);

    return 0;
}

/* hw_params capture callback */
static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
				       struct snd_pcm_hw_params *hw_params)
{
	int ret;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);

	/* -- Florian Demski [FD] */
	/* don't ask me why, but this fixes the bug on my machine */
	if (line6pcm == NULL) {
		if (substream->pcm == NULL)
			return -ENOMEM;
		if (substream->pcm->private_data == NULL)
			return -ENOMEM;
		substream->private_data = substream->pcm->private_data;
		line6pcm = snd_pcm_substream_chip(substream);
	}
	/* -- [FD] end */

	ret = line6_pcm_acquire(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);

	if (ret < 0)
		return ret;

	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0) {
		line6_pcm_release(line6pcm, LINE6_BIT_PCM_ALSA_CAPTURE_BUFFER);
		return ret;
	}

	line6pcm->period_in = params_period_bytes(hw_params);
	return 0;
}

/* hw_params capture callback */
static int snd_line6_capture_hw_params(struct snd_pcm_substream *substream,
				       struct snd_pcm_hw_params *hw_params)
{
	int ret;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);

	/* -- Florian Demski [FD] */
	/* don't ask me why, but this fixes the bug on my machine */
	if (line6pcm == NULL) {
		if (substream->pcm == NULL)
			return -ENOMEM;
		if (substream->pcm->private_data == NULL)
			return -ENOMEM;
		substream->private_data = substream->pcm->private_data;
		line6pcm = snd_pcm_substream_chip(substream);
	}
	/* -- [FD] end */

	if ((line6pcm->flags & MASK_CAPTURE) == 0) {
		ret = line6_alloc_capture_buffer(line6pcm);

		if (ret < 0)
			return ret;
	}

	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0)
		return ret;

	line6pcm->period_in = params_period_bytes(hw_params);
	return 0;
}

static int snd_atiixp_pcm_hw_params(struct snd_pcm_substream *substream,
				   struct snd_pcm_hw_params *hw_params)
{
	struct atiixp_modem *chip = snd_pcm_substream_chip(substream);
	struct atiixp_dma *dma = substream->runtime->private_data;
	int err;
	int i;

	err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
	if (err < 0)
		return err;
	dma->buf_addr = substream->runtime->dma_addr;
	dma->buf_bytes = params_buffer_bytes(hw_params);

	err = atiixp_build_dma_packets(chip, dma, substream,
				       params_periods(hw_params),
				       params_period_bytes(hw_params));
	if (err < 0)
		return err;

	/*                   */
	for (i = 0; i < NUM_ATI_CODECS; i++) {
		if (! chip->ac97[i])
			continue;
		snd_ac97_write(chip->ac97[i], AC97_LINE1_RATE, params_rate(hw_params));
		snd_ac97_write(chip->ac97[i], AC97_LINE1_LEVEL, 0);
	}

	return err;
}

static int txx9aclc_pcm_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = snd_pcm_substream_chip(substream);
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct txx9aclc_dmadata *dmadata = runtime->private_data;
	int ret;

	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	if (ret < 0)
		return ret;

	dev_dbg(socdev->dev,
		"runtime->dma_area = %#lx dma_addr = %#lx dma_bytes = %zd "
		"runtime->min_align %ld\n",
		(unsigned long)runtime->dma_area,
		(unsigned long)runtime->dma_addr, runtime->dma_bytes,
		runtime->min_align);
	dev_dbg(socdev->dev,
		"periods %d period_bytes %d stream %d\n",
		params_periods(params), params_period_bytes(params),
		substream->stream);

	dmadata->substream = substream;
	dmadata->pos = 0;
	return 0;
}