ad1848_lib.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

	/* ok. now enable and ack CODEC IRQ */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	chip->image[AD1848_PIN_CTRL] |= AD1848_IRQ_ENABLE;
	snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->mode = mode;
	up(&chip->open_mutex);

	return 0;
}

static void snd_ad1848_close(ad1848_t *chip)
{
	unsigned long flags;

	down(&chip->open_mutex);
	if (!chip->mode) {
		up(&chip->open_mutex);
		return;
	}
	/* disable IRQ */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	chip->image[AD1848_PIN_CTRL] &= ~AD1848_IRQ_ENABLE;
	snd_ad1848_out(chip, AD1848_PIN_CTRL, chip->image[AD1848_PIN_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	/* now disable capture & playback */

	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO |
			     AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
	snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);

	/* clear IRQ again */
	spin_lock_irqsave(&chip->reg_lock, flags);
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	outb(0, AD1848P(chip, STATUS));	/* clear IRQ */
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->mode = 0;
	up(&chip->open_mutex);
}

/*
 *  ok.. exported functions..
 */

static int snd_ad1848_playback_trigger(snd_pcm_substream_t * substream,
				       int cmd)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	return snd_ad1848_trigger(chip, AD1848_PLAYBACK_ENABLE, SNDRV_PCM_STREAM_PLAYBACK, cmd);
}

static int snd_ad1848_capture_trigger(snd_pcm_substream_t * substream,
				      int cmd)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	return snd_ad1848_trigger(chip, AD1848_CAPTURE_ENABLE, SNDRV_PCM_STREAM_CAPTURE, cmd);
}

static int snd_ad1848_playback_hw_params(snd_pcm_substream_t * substream,
					 snd_pcm_hw_params_t * hw_params)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	int err;

	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	snd_ad1848_calibrate_mute(chip, 1);
	snd_ad1848_set_data_format(chip, hw_params);
	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);
	snd_ad1848_calibrate_mute(chip, 0);
	return 0;
}

static int snd_ad1848_playback_hw_free(snd_pcm_substream_t * substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_playback_prepare(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned long flags;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_PLAYBACK_ENABLE | AD1848_PLAYBACK_PIO);
	snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT);
	count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
	snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static int snd_ad1848_capture_hw_params(snd_pcm_substream_t * substream,
					snd_pcm_hw_params_t * hw_params)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	int err;

	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
		return err;
	snd_ad1848_calibrate_mute(chip, 1);
	snd_ad1848_set_data_format(chip, hw_params);
	snd_ad1848_mce_up(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_FORMAT, chip->image[AD1848_DATA_FORMAT]);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_down(chip);
	snd_ad1848_calibrate_mute(chip, 0);
	return 0;
}

static int snd_ad1848_capture_hw_free(snd_pcm_substream_t * substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1848_capture_prepare(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	unsigned long flags;
	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
	unsigned int count = snd_pcm_lib_period_bytes(substream);

	chip->dma_size = size;
	chip->image[AD1848_IFACE_CTRL] &= ~(AD1848_CAPTURE_ENABLE | AD1848_CAPTURE_PIO);
	snd_dma_program(chip->dma, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT);
	count = snd_ad1848_get_count(chip->image[AD1848_DATA_FORMAT], count) - 1;
	spin_lock_irqsave(&chip->reg_lock, flags);
	snd_ad1848_out(chip, AD1848_DATA_LWR_CNT, (unsigned char) count);
	snd_ad1848_out(chip, AD1848_DATA_UPR_CNT, (unsigned char) (count >> 8));
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	return 0;
}

static irqreturn_t snd_ad1848_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	ad1848_t *chip = dev_id;

	if ((chip->mode & AD1848_MODE_PLAY) && chip->playback_substream &&
	    (chip->mode & AD1848_MODE_RUNNING))
		snd_pcm_period_elapsed(chip->playback_substream);
	if ((chip->mode & AD1848_MODE_CAPTURE) && chip->capture_substream &&
	    (chip->mode & AD1848_MODE_RUNNING))
		snd_pcm_period_elapsed(chip->capture_substream);
	outb(0, AD1848P(chip, STATUS));	/* clear global interrupt bit */
	return IRQ_HANDLED;
}

static snd_pcm_uframes_t snd_ad1848_playback_pointer(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	
	if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_PLAYBACK_ENABLE))
		return 0;
	ptr = snd_dma_pointer(chip->dma, chip->dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_ad1848_capture_pointer(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	size_t ptr;

	if (!(chip->image[AD1848_IFACE_CTRL] & AD1848_CAPTURE_ENABLE))
		return 0;
	ptr = snd_dma_pointer(chip->dma, chip->dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}

/*

 */

static void snd_ad1848_thinkpad_twiddle(ad1848_t *chip, int on) {

	int tmp;

	if (!chip->thinkpad_flag) return;

	outb(0x1c, AD1848_THINKPAD_CTL_PORT1);
	tmp = inb(AD1848_THINKPAD_CTL_PORT2);

	if (on)
		/* turn it on */
		tmp |= AD1848_THINKPAD_CS4248_ENABLE_BIT;
	else
		/* turn it off */
		tmp &= ~AD1848_THINKPAD_CS4248_ENABLE_BIT;
	
	outb(tmp, AD1848_THINKPAD_CTL_PORT2);

}

#ifdef CONFIG_PM
static int snd_ad1848_suspend(snd_card_t *card, unsigned int state)
{
	ad1848_t *chip = card->pm_private_data;

	snd_pcm_suspend_all(chip->pcm);
	/* FIXME: save registers? */

	if (chip->thinkpad_flag)
		snd_ad1848_thinkpad_twiddle(chip, 0);

	return 0;
}

static int snd_ad1848_resume(snd_card_t *card, unsigned int state)
{
	ad1848_t *chip = card->pm_private_data;

	if (chip->thinkpad_flag)
		snd_ad1848_thinkpad_twiddle(chip, 1);

	/* FIXME: restore registers? */

	return 0;
}
#endif /* CONFIG_PM */

static int snd_ad1848_probe(ad1848_t * chip)
{
	unsigned long flags;
	int i, id, rev, ad1847;
	unsigned char *ptr;

#if 0
	snd_ad1848_debug(chip);
#endif
	id = ad1847 = 0;
	for (i = 0; i < 1000; i++) {
		mb();
		if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
			udelay(500);
		else {
			spin_lock_irqsave(&chip->reg_lock, flags);
			snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
			snd_ad1848_out(chip, AD1848_LEFT_INPUT, 0xaa);
			snd_ad1848_out(chip, AD1848_RIGHT_INPUT, 0x45);
			rev = snd_ad1848_in(chip, AD1848_RIGHT_INPUT);
			if (rev == 0x65) {
				spin_unlock_irqrestore(&chip->reg_lock, flags);
				id = 1;
				ad1847 = 1;
				break;
			}
			if (snd_ad1848_in(chip, AD1848_LEFT_INPUT) == 0xaa && rev == 0x45) {
				spin_unlock_irqrestore(&chip->reg_lock, flags);
				id = 1;
				break;
			}
			spin_unlock_irqrestore(&chip->reg_lock, flags);
		}
	}
	if (id != 1)
		return -ENODEV;	/* no valid device found */
	if (chip->hardware == AD1848_HW_DETECT) {
		if (ad1847) {
			chip->hardware = AD1848_HW_AD1847;
		} else {
			chip->hardware = AD1848_HW_AD1848;
			rev = snd_ad1848_in(chip, AD1848_MISC_INFO);
			if (rev & 0x80) {
				chip->hardware = AD1848_HW_CS4248;
			} else if ((rev & 0x0f) == 0x0a) {
				snd_ad1848_out(chip, AD1848_MISC_INFO, 0x40);
				for (i = 0; i < 16; ++i) {
					if (snd_ad1848_in(chip, i) != snd_ad1848_in(chip, i + 16)) {
						chip->hardware = AD1848_HW_CMI8330;
						break;
					}
				}
				snd_ad1848_out(chip, AD1848_MISC_INFO, 0x00);
			}
		}
	}
	spin_lock_irqsave(&chip->reg_lock, flags);
	inb(AD1848P(chip, STATUS));	/* clear any pendings IRQ */
	outb(0, AD1848P(chip, STATUS));
	mb();
	spin_unlock_irqrestore(&chip->reg_lock, flags);

	chip->image[AD1848_MISC_INFO] = 0x00;
	chip->image[AD1848_IFACE_CTRL] =
	    (chip->image[AD1848_IFACE_CTRL] & ~AD1848_SINGLE_DMA) | AD1848_SINGLE_DMA;
	ptr = (unsigned char *) &chip->image;
	snd_ad1848_mce_down(chip);
	spin_lock_irqsave(&chip->reg_lock, flags);
	for (i = 0; i < 16; i++)	/* ok.. fill all AD1848 registers */
		snd_ad1848_out(chip, i, *ptr++);
	spin_unlock_irqrestore(&chip->reg_lock, flags);
	snd_ad1848_mce_up(chip);
	snd_ad1848_mce_down(chip);
	return 0;		/* all things are ok.. */
}

/*

 */

static snd_pcm_hardware_t snd_ad1848_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),
	.rates =		SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5510,
	.rate_max =		48000,
	.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 snd_pcm_hardware_t snd_ad1848_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),
	.rates =		SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		5510,
	.rate_max =		48000,
	.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 int snd_ad1848_playback_open(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	int err;

	if ((err = snd_ad1848_open(chip, AD1848_MODE_PLAY)) < 0)
		return err;
	chip->playback_substream = substream;
	runtime->hw = snd_ad1848_playback;
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
	return 0;
}

static int snd_ad1848_capture_open(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);
	snd_pcm_runtime_t *runtime = substream->runtime;
	int err;

	if ((err = snd_ad1848_open(chip, AD1848_MODE_CAPTURE)) < 0)
		return err;
	chip->capture_substream = substream;
	runtime->hw = snd_ad1848_capture;
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.buffer_bytes_max);
	snd_pcm_limit_isa_dma_size(chip->dma, &runtime->hw.period_bytes_max);
	snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates);
	return 0;
}

static int snd_ad1848_playback_close(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);

	chip->mode &= ~AD1848_MODE_PLAY;
	chip->playback_substream = NULL;
	snd_ad1848_close(chip);
	return 0;
}

static int snd_ad1848_capture_close(snd_pcm_substream_t * substream)
{
	ad1848_t *chip = snd_pcm_substream_chip(substream);

	chip->mode &= ~AD1848_MODE_CAPTURE;
	chip->capture_substream = NULL;
	snd_ad1848_close(chip);
	return 0;
}

static int snd_ad1848_free(ad1848_t *chip)
{
	if (chip->res_port) {
		release_resource(chip->res_port);
		kfree_nocheck(chip->res_port);
	}
	if (chip->irq >= 0)
		free_irq(chip->irq, (void *) chip);