au88x0_pcm.c

鼎力推荐！本程序是基于嵌入式LUNUX系统开发的源程序代码

			vortex_wt_allocroute(chip, stream->dma, 0);
	}
#endif
	substream->runtime->private_data = NULL;
	spin_unlock_irq(&chip->lock);

	return snd_pcm_lib_free_pages(substream);
}

/* prepare callback */
static int snd_vortex_pcm_prepare(snd_pcm_substream_t * substream)
{
	vortex_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	stream_t *stream = (stream_t *) substream->runtime->private_data;
	int dma = stream->dma, fmt, dir;

	// set up the hardware with the current configuration.
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = 1;
	else
		dir = 0;
	fmt = vortex_alsafmt_aspfmt(runtime->format);
	spin_lock_irq(&chip->lock);
	if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
		vortex_adbdma_setmode(chip, dma, 1, dir, fmt, 0 /*? */ ,
				      0);
		vortex_adbdma_setstartbuffer(chip, dma, 0);
		if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_SPDIF)
			vortex_adb_setsrc(chip, dma, runtime->rate, dir);
	}
#ifndef CHIP_AU8810
	else {
		vortex_wtdma_setmode(chip, dma, 1, fmt, 0, 0);
		// FIXME: Set rate (i guess using vortex_wt_writereg() somehow).
		vortex_wtdma_setstartbuffer(chip, dma, 0);
	}
#endif
	spin_unlock_irq(&chip->lock);
	return 0;
}

/* trigger callback */
static int snd_vortex_pcm_trigger(snd_pcm_substream_t * substream, int cmd)
{
	vortex_t *chip = snd_pcm_substream_chip(substream);
	stream_t *stream = (stream_t *) substream->runtime->private_data;
	int dma = stream->dma;

	spin_lock(&chip->lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		// do something to start the PCM engine
		//printk(KERN_INFO "vortex: start %d\n", dma);
		stream->fifo_enabled = 1;
		if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT) {
			vortex_adbdma_resetup(chip, dma);
			vortex_adbdma_startfifo(chip, dma);
		}
#ifndef CHIP_AU8810
		else {
			printk(KERN_INFO "vortex: wt start %d\n", dma);
			vortex_wtdma_startfifo(chip, dma);
		}
#endif
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		// do something to stop the PCM engine
		//printk(KERN_INFO "vortex: stop %d\n", dma);
		stream->fifo_enabled = 0;
		if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
			vortex_adbdma_pausefifo(chip, dma);
		//vortex_adbdma_stopfifo(chip, dma);
#ifndef CHIP_AU8810
		else {
			printk(KERN_INFO "vortex: wt stop %d\n", dma);
			vortex_wtdma_stopfifo(chip, dma);
		}
#endif
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		//printk(KERN_INFO "vortex: pause %d\n", dma);
		if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
			vortex_adbdma_pausefifo(chip, dma);
#ifndef CHIP_AU8810
		else
			vortex_wtdma_pausefifo(chip, dma);
#endif
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		//printk(KERN_INFO "vortex: resume %d\n", dma);
		if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
			vortex_adbdma_resumefifo(chip, dma);
#ifndef CHIP_AU8810
		else
			vortex_wtdma_resumefifo(chip, dma);
#endif
		break;
	default:
		spin_unlock(&chip->lock);
		return -EINVAL;
	}
	spin_unlock(&chip->lock);
	return 0;
}

/* pointer callback */
static snd_pcm_uframes_t snd_vortex_pcm_pointer(snd_pcm_substream_t * substream)
{
	vortex_t *chip = snd_pcm_substream_chip(substream);
	stream_t *stream = (stream_t *) substream->runtime->private_data;
	int dma = stream->dma;
	snd_pcm_uframes_t current_ptr = 0;

	spin_lock(&chip->lock);
	if (VORTEX_PCM_TYPE(substream->pcm) != VORTEX_PCM_WT)
		current_ptr = vortex_adbdma_getlinearpos(chip, dma);
#ifndef CHIP_AU8810
	else
		current_ptr = vortex_wtdma_getlinearpos(chip, dma);
#endif
	//printk(KERN_INFO "vortex: pointer = 0x%x\n", current_ptr);
	spin_unlock(&chip->lock);
	return (bytes_to_frames(substream->runtime, current_ptr));
}

/* Page callback. */
/*
static struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned long offset) {
	
	
}
*/
/* operators */
static snd_pcm_ops_t snd_vortex_playback_ops = {
	.open = snd_vortex_pcm_open,
	.close = snd_vortex_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_vortex_pcm_hw_params,
	.hw_free = snd_vortex_pcm_hw_free,
	.prepare = snd_vortex_pcm_prepare,
	.trigger = snd_vortex_pcm_trigger,
	.pointer = snd_vortex_pcm_pointer,
	.page = snd_pcm_sgbuf_ops_page,
};

/*
*  definitions of capture are omitted here...
*/

static char *vortex_pcm_prettyname[VORTEX_PCM_LAST] = {
	"AU88x0 ADB",
	"AU88x0 SPDIF",
	"AU88x0 A3D",
	"AU88x0 WT",
	"AU88x0 I2S",
};
static char *vortex_pcm_name[VORTEX_PCM_LAST] = {
	"adb",
	"spdif",
	"a3d",
	"wt",
	"i2s",
};

/* SPDIF kcontrol */
static int
snd_vortex_spdif_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
{
	static char *texts[] = { "32000", "44100", "48000" };

	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 1;
	uinfo->value.enumerated.items = 3;
	if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
		uinfo->value.enumerated.item =
		    uinfo->value.enumerated.items - 1;
	strcpy(uinfo->value.enumerated.name,
	       texts[uinfo->value.enumerated.item]);
	return 0;
}
static int
snd_vortex_spdif_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	vortex_t *vortex = snd_kcontrol_chip(kcontrol);

	if (vortex->spdif_sr == 32000)
		ucontrol->value.enumerated.item[0] = 0;
	if (vortex->spdif_sr == 44100)
		ucontrol->value.enumerated.item[0] = 1;
	if (vortex->spdif_sr == 48000)
		ucontrol->value.enumerated.item[0] = 2;
	return 0;
}
static int
snd_vortex_spdif_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	vortex_t *vortex = snd_kcontrol_chip(kcontrol);
	static unsigned int sr[3] = { 32000, 44100, 48000 };

	//printk("vortex: spdif sr = %d\n", ucontrol->value.enumerated.item[0]);
	vortex->spdif_sr = sr[ucontrol->value.enumerated.item[0] % 3];
	vortex_spdif_init(vortex,
			  sr[ucontrol->value.enumerated.item[0] % 3], 1);
	return 1;
}
static snd_kcontrol_new_t vortex_spdif_kcontrol __devinitdata = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "SPDIF SR",
	.index = 0,
	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
	.private_value = 0,
	.info = snd_vortex_spdif_info,
	.get = snd_vortex_spdif_get,
	.put = snd_vortex_spdif_put
};

/* create a pcm device */
static int __devinit snd_vortex_new_pcm(vortex_t * chip, int idx, int nr)
{
	snd_pcm_t *pcm;
	int err, nr_capt;

	if ((chip == 0) || (idx < 0) || (idx > VORTEX_PCM_LAST))
		return -ENODEV;

	/* idx indicates which kind of PCM device. ADB, SPDIF, I2S and A3D share the 
	 * same dma engine. WT uses it own separate dma engine whcih cant capture. */
	if (idx == VORTEX_PCM_ADB)
		nr_capt = nr;
	else
		nr_capt = 0;
	if ((err =
	     snd_pcm_new(chip->card, vortex_pcm_prettyname[idx], idx, nr,
			 nr_capt, &pcm)) < 0)
		return err;
	strcpy(pcm->name, vortex_pcm_name[idx]);
	chip->pcm[idx] = pcm;
	// This is an evil hack, but it saves a lot of duplicated code.
	VORTEX_PCM_TYPE(pcm) = idx;
	pcm->private_data = chip;
	/* set operators */
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_vortex_playback_ops);
	if (idx == VORTEX_PCM_ADB)
		snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
				&snd_vortex_playback_ops);
	
	/* pre-allocation of Scatter-Gather buffers */
	
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
					      snd_dma_pci_data(chip->pci_dev),
					      0x10000, 0x10000);

	if (VORTEX_PCM_TYPE(pcm) == VORTEX_PCM_SPDIF) {
		snd_kcontrol_t *kcontrol;

		if ((kcontrol =
		     snd_ctl_new1(&vortex_spdif_kcontrol, chip)) == NULL)
			return -ENOMEM;
		if ((err = snd_ctl_add(chip->card, kcontrol)) < 0)
			return err;
	}
	return 0;
}