cx88-alsa.c

来自「linux2.6.16版本」· C语言 代码 · 共 848 行 · 第 1/2 页

	buf->vb.size   = chip->dma_size;
	buf->vb.field  = V4L2_FIELD_NONE;

	videobuf_dma_init(&buf->vb.dma);
	videobuf_dma_init_kernel(&buf->vb.dma,PCI_DMA_FROMDEVICE,
			(PAGE_ALIGN(buf->vb.size) >> PAGE_SHIFT));

	videobuf_dma_pci_map(chip->pci,&buf->vb.dma);


	cx88_risc_databuffer(chip->pci, &buf->risc,
			buf->vb.dma.sglist,
			buf->vb.width, buf->vb.height);

	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
	buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

	buf->vb.state = STATE_PREPARED;

	buf->bpl = chip->period_size;
	chip->buf = buf;
	chip->dma_risc = buf->vb.dma;

	dprintk(1,"Buffer ready at %u\n",chip->dma_risc.nr_pages);
	substream->runtime->dma_area = chip->dma_risc.vmalloc;
	return 0;
}

/*
 * hw free callback
 */
static int snd_cx88_hw_free(snd_pcm_substream_t * substream)
{

	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);

	if (substream->runtime->dma_area) {
		dsp_buffer_free(chip);
		substream->runtime->dma_area = NULL;
	}

	return 0;
}

/*
 * prepare callback
 */
static int snd_cx88_prepare(snd_pcm_substream_t *substream)
{
	return 0;
}


/*
 * trigger callback
 */
static int snd_cx88_card_trigger(snd_pcm_substream_t *substream, int cmd)
{
	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
	int err;

	spin_lock(&chip->reg_lock);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		err=_cx88_start_audio_dma(chip);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		err=_cx88_stop_audio_dma(chip);
		break;
	default:
		err=-EINVAL;
		break;
	}

	spin_unlock(&chip->reg_lock);

	return err;
}

/*
 * pointer callback
 */
static snd_pcm_uframes_t snd_cx88_pointer(snd_pcm_substream_t *substream)
{
	snd_cx88_card_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;

	if (chip->read_count) {
		chip->read_count -= snd_pcm_lib_period_bytes(substream);
		chip->read_offset += snd_pcm_lib_period_bytes(substream);
		if (chip->read_offset == chip->dma_size)
			chip->read_offset = 0;
	}

	dprintk(2, "Pointer time, will return %li, read %li\n",chip->read_offset,chip->read_count);
	return bytes_to_frames(runtime, chip->read_offset);

}

/*
 * operators
 */
static snd_pcm_ops_t snd_cx88_pcm_ops = {
	.open = snd_cx88_pcm_open,
	.close = snd_cx88_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_cx88_hw_params,
	.hw_free = snd_cx88_hw_free,
	.prepare = snd_cx88_prepare,
	.trigger = snd_cx88_card_trigger,
	.pointer = snd_cx88_pointer,
};

/*
 * create a PCM device
 */
static int __devinit snd_cx88_pcm(snd_cx88_card_t *chip, int device, char *name)
{
	int err;
	snd_pcm_t *pcm;

	err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
	if (err < 0)
		return err;
	pcm->private_data = chip;
	strcpy(pcm->name, name);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx88_pcm_ops);

	return 0;
}

/****************************************************************************
				CONTROL INTERFACE
 ****************************************************************************/
static int snd_cx88_capture_volume_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *info)
{
	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	info->count = 1;
	info->value.integer.min = 0;
	info->value.integer.max = 0x3f;

	return 0;
}

/* OK - TODO: test it */
static int snd_cx88_capture_volume_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
{
	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
	struct cx88_core *core=chip->core;

	value->value.integer.value[0] = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f);

	return 0;
}

/* OK - TODO: test it */
static int snd_cx88_capture_volume_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
{
	snd_cx88_card_t *chip = snd_kcontrol_chip(kcontrol);
	struct cx88_core *core=chip->core;
	int v;
	u32 old_control;

	spin_lock_irq(&chip->reg_lock);
	old_control = 0x3f - (cx_read(AUD_VOL_CTL) & 0x3f);
	v = 0x3f - (value->value.integer.value[0] & 0x3f);
	cx_andor(AUD_VOL_CTL, 0x3f, v);
	spin_unlock_irq(&chip->reg_lock);

	return v != old_control;
}

static snd_kcontrol_new_t snd_cx88_capture_volume = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Volume",
	.info = snd_cx88_capture_volume_info,
	.get = snd_cx88_capture_volume_get,
	.put = snd_cx88_capture_volume_put,
};


/****************************************************************************
			Basic Flow for Sound Devices
 ****************************************************************************/

/*
 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
 * Only boards with eeprom and byte 1 at eeprom=1 have it
 */

static struct pci_device_id cx88_audio_pci_tbl[] = {
	{0x14f1,0x8801,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{0x14f1,0x8811,PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{0, }
};
MODULE_DEVICE_TABLE(pci, cx88_audio_pci_tbl);

/*
 * Chip-specific destructor
 */

static int snd_cx88_free(snd_cx88_card_t *chip)
{

	if (chip->irq >= 0){
		synchronize_irq(chip->irq);
		free_irq(chip->irq, chip);
	}

	cx88_core_put(chip->core,chip->pci);

	pci_disable_device(chip->pci);
	return 0;
}

/*
 * Component Destructor
 */
static void snd_cx88_dev_free(snd_card_t * card)
{
	snd_cx88_card_t *chip = card->private_data;

	snd_cx88_free(chip);
}


/*
 * Alsa Constructor - Component probe
 */

static int devno;
static int __devinit snd_cx88_create(snd_card_t *card, struct pci_dev *pci,
				    snd_cx88_card_t **rchip)
{
	snd_cx88_card_t   *chip;
	struct cx88_core  *core;
	int               err;

	*rchip = NULL;

	err = pci_enable_device(pci);
	if (err < 0)
		return err;

	pci_set_master(pci);

	chip = (snd_cx88_card_t *) card->private_data;

	core = cx88_core_get(pci);

	if (!pci_dma_supported(pci,0xffffffff)) {
		dprintk(0, "%s/1: Oops: no 32bit PCI DMA ???\n",core->name);
		err = -EIO;
		cx88_core_put(core,pci);
		return err;
	}


	/* pci init */
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;
	spin_lock_init(&chip->reg_lock);

	cx88_reset(core);
	if (NULL == core) {
		err = -EINVAL;
		kfree (chip);
		return err;
	}
	chip->core = core;

	/* get irq */
	err = request_irq(chip->pci->irq, cx8801_irq,
			  SA_SHIRQ | SA_INTERRUPT, chip->core->name, chip);
	if (err < 0) {
		dprintk(0, "%s: can't get IRQ %d\n",
		       chip->core->name, chip->pci->irq);
		return err;
	}

	/* print pci info */
	pci_read_config_byte(pci, PCI_CLASS_REVISION, &chip->pci_rev);
	pci_read_config_byte(pci, PCI_LATENCY_TIMER,  &chip->pci_lat);

	dprintk(1,"ALSA %s/%i: found at %s, rev: %d, irq: %d, "
	       "latency: %d, mmio: 0x%lx\n", core->name, devno,
	       pci_name(pci), chip->pci_rev, pci->irq,
	       chip->pci_lat,pci_resource_start(pci,0));

	chip->irq = pci->irq;
	synchronize_irq(chip->irq);

	snd_card_set_dev(card, &pci->dev);

	*rchip = chip;

	return 0;
}

static int __devinit cx88_audio_initdev(struct pci_dev *pci,
				    const struct pci_device_id *pci_id)
{
	snd_card_t       *card;
	snd_cx88_card_t  *chip;
	int              err;

	if (devno >= SNDRV_CARDS)
		return (-ENODEV);

	if (!enable[devno]) {
		++devno;
		return (-ENOENT);
	}

	card = snd_card_new(index[devno], id[devno], THIS_MODULE, sizeof(snd_cx88_card_t));
	if (!card)
		return (-ENOMEM);

	card->private_free = snd_cx88_dev_free;

	err = snd_cx88_create(card, pci, &chip);
	if (err < 0)
		return (err);

	err = snd_cx88_pcm(chip, 0, "CX88 Digital");

	if (err < 0) {
		snd_card_free(card);
		return (err);
	}

	err = snd_ctl_add(card, snd_ctl_new1(&snd_cx88_capture_volume, chip));
	if (err < 0) {
		snd_card_free(card);
		return (err);
	}

	strcpy (card->driver, "CX88x");
	sprintf(card->shortname, "Conexant CX%x", pci->device);
	sprintf(card->longname, "%s at %#lx",
		card->shortname, pci_resource_start(pci, 0));
	strcpy (card->mixername, "CX88");

	dprintk (0, "%s/%i: ALSA support for cx2388x boards\n",
	       card->driver,devno);

	err = snd_card_register(card);
	if (err < 0) {
		snd_card_free(card);
		return (err);
	}
	snd_cx88_cards[devno] = card;

	pci_set_drvdata(pci,card);

	devno++;
	return 0;
}
/*
 * ALSA destructor
 */
static void __devexit cx88_audio_finidev(struct pci_dev *pci)
{
	struct cx88_audio_dev *card = pci_get_drvdata(pci);

	snd_card_free((void *)card);

	pci_set_drvdata(pci, NULL);

	devno--;
}

/*
 * PCI driver definition
 */

static struct pci_driver cx88_audio_pci_driver = {
	.name     = "cx88_audio",
	.id_table = cx88_audio_pci_tbl,
	.probe    = cx88_audio_initdev,
	.remove   = cx88_audio_finidev,
};

/****************************************************************************
				LINUX MODULE INIT
 ****************************************************************************/

/*
 * module init
 */
static int cx88_audio_init(void)
{
	printk(KERN_INFO "cx2388x alsa driver version %d.%d.%d loaded\n",
	       (CX88_VERSION_CODE >> 16) & 0xff,
	       (CX88_VERSION_CODE >>  8) & 0xff,
	       CX88_VERSION_CODE & 0xff);
#ifdef SNAPSHOT
	printk(KERN_INFO "cx2388x: snapshot date %04d-%02d-%02d\n",
	       SNAPSHOT/10000, (SNAPSHOT/100)%100, SNAPSHOT%100);
#endif
	return pci_register_driver(&cx88_audio_pci_driver);
}

/*
 * module remove
 */
static void cx88_audio_fini(void)
{

	pci_unregister_driver(&cx88_audio_pci_driver);
}

module_init(cx88_audio_init);
module_exit(cx88_audio_fini);

/* ----------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */