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");