saa7134-alsa.c

linux-2.6.15.6

	if (0 != (err = videobuf_dma_pci_map(dev->pci, &dev->dmasound.dma))) {
		dsp_buffer_free(dev);
		return err;
	}
	if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->dmasound.pt))) {
		videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
		dsp_buffer_free(dev);
		return err;
	}
	if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->dmasound.pt,
						dev->dmasound.dma.sglist,
						dev->dmasound.dma.sglen,
						0))) {
		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
		videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
		dsp_buffer_free(dev);
		return err;
	}

	/* I should be able to use runtime->dma_addr in the control
	   byte, but it doesn't work. So I allocate the DMA using the
	   V4L functions, and force ALSA to use that as the DMA area */

	substream->runtime->dma_area = dev->dmasound.dma.vmalloc;

	return 1;

}

/*
 * ALSA hardware release
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called after closing the device, but before snd_card_saa7134_capture_close
 *   It stops the DMA audio and releases the buffers.
 *
 */

static int snd_card_saa7134_hw_free(snd_pcm_substream_t * substream)
{
	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
	struct saa7134_dev *dev;

	dev = saa7134->dev;

	if (substream->runtime->dma_area) {
		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
		videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
		dsp_buffer_free(dev);
		substream->runtime->dma_area = NULL;
	}

	return 0;
}

/*
 * ALSA capture finish
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called after closing the device.
 *
 */

static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
{
	return 0;
}

/*
 * ALSA capture start
 *
 *   - One of the ALSA capture callbacks.
 *
 *   Called when opening the device. It creates and populates the PCM
 *  structure
 *
 */

static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
{
	snd_pcm_runtime_t *runtime = substream->runtime;
	snd_card_saa7134_pcm_t *pcm;
	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
	struct saa7134_dev *dev = saa7134->dev;
	int err;

	down(&dev->dmasound.lock);

	dev->dmasound.read_count  = 0;
	dev->dmasound.read_offset = 0;

	up(&dev->dmasound.lock);

	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
	if (pcm == NULL)
		return -ENOMEM;

	pcm->dev=saa7134->dev;

	spin_lock_init(&pcm->lock);

	pcm->substream = substream;
	runtime->private_data = pcm;
	runtime->private_free = snd_card_saa7134_runtime_free;
	runtime->hw = snd_card_saa7134_capture;

	if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
		return err;

	return 0;
}

/*
 * ALSA capture callbacks definition
 */

static snd_pcm_ops_t snd_card_saa7134_capture_ops = {
	.open =			snd_card_saa7134_capture_open,
	.close =		snd_card_saa7134_capture_close,
	.ioctl =		snd_pcm_lib_ioctl,
	.hw_params =		snd_card_saa7134_hw_params,
	.hw_free =		snd_card_saa7134_hw_free,
	.prepare =		snd_card_saa7134_capture_prepare,
	.trigger =		snd_card_saa7134_capture_trigger,
	.pointer =		snd_card_saa7134_capture_pointer,
};

/*
 * ALSA PCM setup
 *
 *   Called when initializing the board. Sets up the name and hooks up
 *  the callbacks
 *
 */

static int snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
{
	snd_pcm_t *pcm;
	int err;

	if ((err = snd_pcm_new(saa7134->card, "SAA7134 PCM", device, 0, 1, &pcm)) < 0)
		return err;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_saa7134_capture_ops);
	pcm->private_data = saa7134;
	pcm->info_flags = 0;
	strcpy(pcm->name, "SAA7134 PCM");
	return 0;
}

#define SAA713x_VOLUME(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_saa7134_volume_info, \
  .get = snd_saa7134_volume_get, .put = snd_saa7134_volume_put, \
  .private_value = addr }

static int snd_saa7134_volume_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 20;
	return 0;
}

static int snd_saa7134_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
	int addr = kcontrol->private_value;

	ucontrol->value.integer.value[0] = chip->mixer_volume[addr][0];
	ucontrol->value.integer.value[1] = chip->mixer_volume[addr][1];
	return 0;
}

static int snd_saa7134_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
	int change, addr = kcontrol->private_value;
	int left, right;

	left = ucontrol->value.integer.value[0];
	if (left < 0)
		left = 0;
	if (left > 20)
		left = 20;
	right = ucontrol->value.integer.value[1];
	if (right < 0)
		right = 0;
	if (right > 20)
		right = 20;
	spin_lock_irq(&chip->mixer_lock);
	change = chip->mixer_volume[addr][0] != left ||
		 chip->mixer_volume[addr][1] != right;
	chip->mixer_volume[addr][0] = left;
	chip->mixer_volume[addr][1] = right;
	spin_unlock_irq(&chip->mixer_lock);
	return change;
}

#define SAA713x_CAPSRC(xname, xindex, addr) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_saa7134_capsrc_info, \
  .get = snd_saa7134_capsrc_get, .put = snd_saa7134_capsrc_put, \
  .private_value = addr }

static int snd_saa7134_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 1;
	return 0;
}

static int snd_saa7134_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
	int addr = kcontrol->private_value;

	spin_lock_irq(&chip->mixer_lock);
	ucontrol->value.integer.value[0] = chip->capture_source[addr][0];
	ucontrol->value.integer.value[1] = chip->capture_source[addr][1];
	spin_unlock_irq(&chip->mixer_lock);

	return 0;
}

static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
	int change, addr = kcontrol->private_value;
	int left, right;
	u32 anabar, xbarin;
	int analog_io, rate;
	struct saa7134_dev *dev;

	dev = chip->dev;

	left = ucontrol->value.integer.value[0] & 1;
	right = ucontrol->value.integer.value[1] & 1;
	spin_lock_irq(&chip->mixer_lock);

	change = chip->capture_source[addr][0] != left ||
		 chip->capture_source[addr][1] != right;
	chip->capture_source[addr][0] = left;
	chip->capture_source[addr][1] = right;
	dev->dmasound.input=addr;
	spin_unlock_irq(&chip->mixer_lock);


	if (change) {
	  switch (dev->pci->device) {

	   case PCI_DEVICE_ID_PHILIPS_SAA7134:
		switch (addr) {
			case MIXER_ADDR_TVTUNER:
				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0xc0);
				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,   0x03, 0x00);
				break;
			case MIXER_ADDR_LINE1:
			case MIXER_ADDR_LINE2:
				analog_io = (MIXER_ADDR_LINE1 == addr) ? 0x00 : 0x08;
				rate = (32000 == dev->dmasound.rate) ? 0x01 : 0x03;
				saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x08, analog_io);
				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL, 0xc0, 0x80);
				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,   0x03, rate);
				break;
		}

		break;
	   case PCI_DEVICE_ID_PHILIPS_SAA7133:
	   case PCI_DEVICE_ID_PHILIPS_SAA7135:
		xbarin = 0x03; // adc
		anabar = 0;
		switch (addr) {
			case MIXER_ADDR_TVTUNER:
				xbarin = 0; // Demodulator
				anabar = 2; // DACs
				break;
			case MIXER_ADDR_LINE1:
				anabar = 0;  // aux1, aux1
				break;
			case MIXER_ADDR_LINE2:
				anabar = 9;  // aux2, aux2
				break;
		}

	    	/* output xbar always main channel */
		saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL1, 0xbbbb10);

		if (left || right) { // We've got data, turn the input on
		  saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, xbarin);
		  saa_writel(SAA7133_ANALOG_IO_SELECT, anabar);
		} else {
		  saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, 0);
		  saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
		}
		break;
	  }
	}

	return change;
}

static snd_kcontrol_new_t snd_saa7134_controls[] = {
SAA713x_VOLUME("Video Volume", 0, MIXER_ADDR_TVTUNER),
SAA713x_CAPSRC("Video Capture Switch", 0, MIXER_ADDR_TVTUNER),
SAA713x_VOLUME("Line Volume", 1, MIXER_ADDR_LINE1),
SAA713x_CAPSRC("Line Capture Switch", 1, MIXER_ADDR_LINE1),
SAA713x_VOLUME("Line Volume", 2, MIXER_ADDR_LINE2),
SAA713x_CAPSRC("Line Capture Switch", 2, MIXER_ADDR_LINE2),
};

/*
 * ALSA mixer setup
 *
 *   Called when initializing the board. Sets up the name and hooks up
 *  the callbacks
 *
 */

static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
{
	snd_card_t *card = chip->card;
	unsigned int idx;
	int err;

	snd_assert(chip != NULL, return -EINVAL);
	strcpy(card->mixername, "SAA7134 Mixer");

	for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_controls); idx++) {
		if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_saa7134_controls[idx], chip))) < 0)
			return err;
	}
	return 0;
}

static void snd_saa7134_free(snd_card_t * card)
{
	snd_card_saa7134_t *chip = card->private_data;

	if (chip->dev->dmasound.priv_data == NULL)
		return;

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

	chip->dev->dmasound.priv_data = NULL;

}

/*
 * ALSA initialization
 *
 *   Called by the init routine, once for each saa7134 device present,
 *  it creates the basic structures and registers the ALSA devices
 *
 */

static int alsa_card_saa7134_create(struct saa7134_dev *dev, int devnum)
{

	snd_card_t *card;
	snd_card_saa7134_t *chip;
	int err;


	if (devnum >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[devnum])
		return -ENODEV;

	card = snd_card_new(index[devnum], id[devnum], THIS_MODULE, sizeof(snd_card_saa7134_t));

	if (card == NULL)
		return -ENOMEM;

	strcpy(card->driver, "SAA7134");

	/* Card "creation" */

	card->private_free = snd_saa7134_free;
	chip = (snd_card_saa7134_t *) card->private_data;

	spin_lock_init(&chip->lock);
	spin_lock_init(&chip->mixer_lock);

	chip->dev = dev;

	chip->card = card;

	chip->pci = dev->pci;
	chip->iobase = pci_resource_start(dev->pci, 0);


	err = request_irq(dev->pci->irq, saa7134_alsa_irq,
				SA_SHIRQ | SA_INTERRUPT, dev->name,
				(void*) &dev->dmasound);

	if (err < 0) {
		printk(KERN_ERR "%s: can't get IRQ %d for ALSA\n",
			dev->name, dev->pci->irq);
		goto __nodev;
	}

	chip->irq = dev->pci->irq;

	init_MUTEX(&dev->dmasound.lock);

	if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
		goto __nodev;

	if ((err = snd_card_saa7134_pcm(chip, 0)) < 0)
		goto __nodev;

	snd_card_set_dev(card, &chip->pci->dev);

	/* End of "creation" */

	strcpy(card->shortname, "SAA7134");
	sprintf(card->longname, "%s at 0x%lx irq %d",
		chip->dev->name, chip->iobase, chip->irq);

	printk(KERN_INFO "%s/alsa: %s registered as card %d\n",dev->name,card->longname,index[devnum]);

	if ((err = snd_card_register(card)) == 0) {
		snd_saa7134_cards[devnum] = card;
		return 0;
	}

__nodev:
	snd_card_free(card);
	return err;
}


static int alsa_device_init(struct saa7134_dev *dev)
{
	dev->dmasound.priv_data = dev;
	alsa_card_saa7134_create(dev,dev->nr);
	return 1;
}

static int alsa_device_exit(struct saa7134_dev *dev)
{

	snd_card_free(snd_saa7134_cards[dev->nr]);
	snd_saa7134_cards[dev->nr] = NULL;
	return 1;
}

/*
 * Module initializer
 *
 * Loops through present saa7134 cards, and assigns an ALSA device
 * to each one
 *
 */

static int saa7134_alsa_init(void)
{
	struct saa7134_dev *dev = NULL;
	struct list_head *list;

	if (!dmasound_init && !dmasound_exit) {
		dmasound_init = alsa_device_init;
		dmasound_exit = alsa_device_exit;
	} else {
		printk(KERN_WARNING "saa7134 ALSA: can't load, DMA sound handler already assigned (probably to OSS)\n");
		return -EBUSY;
	}

	printk(KERN_INFO "saa7134 ALSA driver for DMA sound loaded\n");

	list_for_each(list,&saa7134_devlist) {
		dev = list_entry(list, struct saa7134_dev, devlist);
		if (dev->dmasound.priv_data == NULL) {
			alsa_device_init(dev);
		} else {
			printk(KERN_ERR "saa7134 ALSA: DMA sound is being handled by OSS. ignoring %s\n",dev->name);
			return -EBUSY;
		}
	}

	if (dev == NULL)
		printk(KERN_INFO "saa7134 ALSA: no saa7134 cards found\n");

	return 0;

}

/*
 * Module destructor
 */

static void saa7134_alsa_exit(void)
{
	int idx;

	for (idx = 0; idx < SNDRV_CARDS; idx++) {
		snd_card_free(snd_saa7134_cards[idx]);
	}

	dmasound_init = NULL;
	dmasound_exit = NULL;
	printk(KERN_INFO "saa7134 ALSA driver for DMA sound unloaded\n");

	return;
}

/* We initialize this late, to make sure the sound system is up and running */
late_initcall(saa7134_alsa_init);
module_exit(saa7134_alsa_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ricardo Cerqueira");