ad1816a_lib.c

linux 内核源代码

	if ((status & AD1816A_PLAYBACK_IRQ_PENDING) && chip->playback_substream)
		snd_pcm_period_elapsed(chip->playback_substream);

	if ((status & AD1816A_CAPTURE_IRQ_PENDING) && chip->capture_substream)
		snd_pcm_period_elapsed(chip->capture_substream);

	if ((status & AD1816A_TIMER_IRQ_PENDING) && chip->timer)
		snd_timer_interrupt(chip->timer, chip->timer->sticks);

	spin_lock(&chip->lock);
	snd_ad1816a_out(chip, AD1816A_INTERRUPT_STATUS, 0x00);
	spin_unlock(&chip->lock);
	return IRQ_HANDLED;
}


static struct snd_pcm_hardware snd_ad1816a_playback = {
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		(SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
				 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S16_BE),
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		55200,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

static struct snd_pcm_hardware snd_ad1816a_capture = {
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		(SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW |
				 SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
				 SNDRV_PCM_FMTBIT_S16_BE),
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		55200,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	(128*1024),
	.period_bytes_min =	64,
	.period_bytes_max =	(128*1024),
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0,
};

#if 0 /* not used now */
static int snd_ad1816a_timer_close(struct snd_timer *timer)
{
	struct snd_ad1816a *chip = snd_timer_chip(timer);
	snd_ad1816a_close(chip, AD1816A_MODE_TIMER);
	return 0;
}

static int snd_ad1816a_timer_open(struct snd_timer *timer)
{
	struct snd_ad1816a *chip = snd_timer_chip(timer);
	snd_ad1816a_open(chip, AD1816A_MODE_TIMER);
	return 0;
}

static unsigned long snd_ad1816a_timer_resolution(struct snd_timer *timer)
{
	snd_assert(timer != NULL, return 0);

	return 10000;
}

static int snd_ad1816a_timer_start(struct snd_timer *timer)
{
	unsigned short bits;
	unsigned long flags;
	struct snd_ad1816a *chip = snd_timer_chip(timer);
	spin_lock_irqsave(&chip->lock, flags);
	bits = snd_ad1816a_read(chip, AD1816A_INTERRUPT_ENABLE);

	if (!(bits & AD1816A_TIMER_ENABLE)) {
		snd_ad1816a_write(chip, AD1816A_TIMER_BASE_COUNT,
			timer->sticks & 0xffff);

		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_TIMER_ENABLE, 0xffff);
	}
	spin_unlock_irqrestore(&chip->lock, flags);
	return 0;
}

static int snd_ad1816a_timer_stop(struct snd_timer *timer)
{
	unsigned long flags;
	struct snd_ad1816a *chip = snd_timer_chip(timer);
	spin_lock_irqsave(&chip->lock, flags);

	snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
		AD1816A_TIMER_ENABLE, 0x0000);

	spin_unlock_irqrestore(&chip->lock, flags);
	return 0;
}

static struct snd_timer_hardware snd_ad1816a_timer_table = {
	.flags =	SNDRV_TIMER_HW_AUTO,
	.resolution =	10000,
	.ticks =	65535,
	.open =		snd_ad1816a_timer_open,
	.close =	snd_ad1816a_timer_close,
	.c_resolution =	snd_ad1816a_timer_resolution,
	.start =	snd_ad1816a_timer_start,
	.stop =		snd_ad1816a_timer_stop,
};
#endif /* not used now */


static int snd_ad1816a_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int error;

	if ((error = snd_ad1816a_open(chip, AD1816A_MODE_PLAYBACK)) < 0)
		return error;
	runtime->hw = snd_ad1816a_playback;
	snd_pcm_limit_isa_dma_size(chip->dma1, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma1, &runtime->hw.period_bytes_max);
	chip->playback_substream = substream;
	return 0;
}

static int snd_ad1816a_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int error;

	if ((error = snd_ad1816a_open(chip, AD1816A_MODE_CAPTURE)) < 0)
		return error;
	runtime->hw = snd_ad1816a_capture;
	snd_pcm_limit_isa_dma_size(chip->dma2, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma2, &runtime->hw.period_bytes_max);
	chip->capture_substream = substream;
	return 0;
}

static int snd_ad1816a_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);

	chip->playback_substream = NULL;
	snd_ad1816a_close(chip, AD1816A_MODE_PLAYBACK);
	return 0;
}

static int snd_ad1816a_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);

	chip->capture_substream = NULL;
	snd_ad1816a_close(chip, AD1816A_MODE_CAPTURE);
	return 0;
}


static void __devinit snd_ad1816a_init(struct snd_ad1816a *chip)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->lock, flags);

	snd_ad1816a_out(chip, AD1816A_INTERRUPT_STATUS, 0x00);
	snd_ad1816a_out_mask(chip, AD1816A_PLAYBACK_CONFIG,
		AD1816A_PLAYBACK_ENABLE | AD1816A_PLAYBACK_PIO, 0x00);
	snd_ad1816a_out_mask(chip, AD1816A_CAPTURE_CONFIG,
		AD1816A_CAPTURE_ENABLE | AD1816A_CAPTURE_PIO, 0x00);
	snd_ad1816a_write(chip, AD1816A_INTERRUPT_ENABLE, 0x0000);
	snd_ad1816a_write_mask(chip, AD1816A_CHIP_CONFIG,
		AD1816A_CAPTURE_NOT_EQUAL | AD1816A_WSS_ENABLE, 0xffff);
	snd_ad1816a_write(chip, AD1816A_DSP_CONFIG, 0x0000);
	snd_ad1816a_write(chip, AD1816A_POWERDOWN_CTRL, 0x0000);

	spin_unlock_irqrestore(&chip->lock, flags);
}

static int __devinit snd_ad1816a_probe(struct snd_ad1816a *chip)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->lock, flags);

	switch (chip->version = snd_ad1816a_read(chip, AD1816A_VERSION_ID)) {
	case 0:
		chip->hardware = AD1816A_HW_AD1815;
		break;
	case 1:
		chip->hardware = AD1816A_HW_AD18MAX10;
		break;
	case 3:
		chip->hardware = AD1816A_HW_AD1816A;
		break;
	default:
		chip->hardware = AD1816A_HW_AUTO;
	}

	spin_unlock_irqrestore(&chip->lock, flags);
	return 0;
}

static int snd_ad1816a_free(struct snd_ad1816a *chip)
{
	release_and_free_resource(chip->res_port);
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *) chip);
	if (chip->dma1 >= 0) {
		snd_dma_disable(chip->dma1);
		free_dma(chip->dma1);
	}
	if (chip->dma2 >= 0) {
		snd_dma_disable(chip->dma2);
		free_dma(chip->dma2);
	}
	kfree(chip);
	return 0;
}

static int snd_ad1816a_dev_free(struct snd_device *device)
{
	struct snd_ad1816a *chip = device->device_data;
	return snd_ad1816a_free(chip);
}

static const char __devinit *snd_ad1816a_chip_id(struct snd_ad1816a *chip)
{
	switch (chip->hardware) {
	case AD1816A_HW_AD1816A: return "AD1816A";
	case AD1816A_HW_AD1815:	return "AD1815";
	case AD1816A_HW_AD18MAX10: return "AD18max10";
	default:
		snd_printk("Unknown chip version %d:%d.\n",
			chip->version, chip->hardware);
		return "AD1816A - unknown";
	}
}

int __devinit snd_ad1816a_create(struct snd_card *card,
				 unsigned long port, int irq, int dma1, int dma2,
				 struct snd_ad1816a **rchip)
{
        static struct snd_device_ops ops = {
		.dev_free =	snd_ad1816a_dev_free,
	};
	int error;
	struct snd_ad1816a *chip;

	*rchip = NULL;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;
	chip->irq = -1;
	chip->dma1 = -1;
	chip->dma2 = -1;

	if ((chip->res_port = request_region(port, 16, "AD1816A")) == NULL) {
		snd_printk(KERN_ERR "ad1816a: can't grab port 0x%lx\n", port);
		snd_ad1816a_free(chip);
		return -EBUSY;
	}
	if (request_irq(irq, snd_ad1816a_interrupt, IRQF_DISABLED, "AD1816A", (void *) chip)) {
		snd_printk(KERN_ERR "ad1816a: can't grab IRQ %d\n", irq);
		snd_ad1816a_free(chip);
		return -EBUSY;
	}
	chip->irq = irq;
	if (request_dma(dma1, "AD1816A - 1")) {
		snd_printk(KERN_ERR "ad1816a: can't grab DMA1 %d\n", dma1);
		snd_ad1816a_free(chip);
		return -EBUSY;
	}
	chip->dma1 = dma1;
	if (request_dma(dma2, "AD1816A - 2")) {
		snd_printk(KERN_ERR "ad1816a: can't grab DMA2 %d\n", dma2);
		snd_ad1816a_free(chip);
		return -EBUSY;
	}
	chip->dma2 = dma2;

	chip->card = card;
	chip->port = port;
	spin_lock_init(&chip->lock);

	if ((error = snd_ad1816a_probe(chip))) {
		snd_ad1816a_free(chip);
		return error;
	}

	snd_ad1816a_init(chip);

	/* Register device */
	if ((error = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
		snd_ad1816a_free(chip);
		return error;
	}

	*rchip = chip;
	return 0;
}

static struct snd_pcm_ops snd_ad1816a_playback_ops = {
	.open =		snd_ad1816a_playback_open,
	.close =	snd_ad1816a_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_ad1816a_hw_params,
	.hw_free =	snd_ad1816a_hw_free,
	.prepare =	snd_ad1816a_playback_prepare,
	.trigger =	snd_ad1816a_playback_trigger,
	.pointer =	snd_ad1816a_playback_pointer,
};

static struct snd_pcm_ops snd_ad1816a_capture_ops = {