/*
    ad1816a.c - lowlevel code for Analog Devices AD1816A chip.
    Copyright (C) 1999-2000 by Massimo Piccioni <dafastidio@libero.it>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/tlv.h>
#include <sound/ad1816a.h>

#include <asm/io.h>
#include <asm/dma.h>

static inline int snd_ad1816a_busy_wait(struct snd_ad1816a *chip)
{
	int timeout;

	for (timeout = 1000; timeout-- > 0; udelay(10))
		if (inb(AD1816A_REG(AD1816A_CHIP_STATUS)) & AD1816A_READY)
			return 0;

	snd_printk(KERN_WARNING "chip busy.\n");
	return -EBUSY;
}

static inline unsigned char snd_ad1816a_in(struct snd_ad1816a *chip, unsigned char reg)
{
	snd_ad1816a_busy_wait(chip);
	return inb(AD1816A_REG(reg));
}

static inline void snd_ad1816a_out(struct snd_ad1816a *chip, unsigned char reg,
			    unsigned char value)
{
	snd_ad1816a_busy_wait(chip);
	outb(value, AD1816A_REG(reg));
}

static inline void snd_ad1816a_out_mask(struct snd_ad1816a *chip, unsigned char reg,
				 unsigned char mask, unsigned char value)
{
	snd_ad1816a_out(chip, reg,
		(value & mask) | (snd_ad1816a_in(chip, reg) & ~mask));
}

static unsigned short snd_ad1816a_read(struct snd_ad1816a *chip, unsigned char reg)
{
	snd_ad1816a_out(chip, AD1816A_INDIR_ADDR, reg & 0x3f);
	return snd_ad1816a_in(chip, AD1816A_INDIR_DATA_LOW) |
		(snd_ad1816a_in(chip, AD1816A_INDIR_DATA_HIGH) << 8);
}

static void snd_ad1816a_write(struct snd_ad1816a *chip, unsigned char reg,
			      unsigned short value)
{
	snd_ad1816a_out(chip, AD1816A_INDIR_ADDR, reg & 0x3f);
	snd_ad1816a_out(chip, AD1816A_INDIR_DATA_LOW, value & 0xff);
	snd_ad1816a_out(chip, AD1816A_INDIR_DATA_HIGH, (value >> 8) & 0xff);
}

static void snd_ad1816a_write_mask(struct snd_ad1816a *chip, unsigned char reg,
				   unsigned short mask, unsigned short value)
{
	snd_ad1816a_write(chip, reg,
		(value & mask) | (snd_ad1816a_read(chip, reg) & ~mask));
}


static unsigned char snd_ad1816a_get_format(struct snd_ad1816a *chip,
					    unsigned int format, int channels)
{
	unsigned char retval = AD1816A_FMT_LINEAR_8;

	switch (format) {
	case SNDRV_PCM_FORMAT_MU_LAW:
		retval = AD1816A_FMT_ULAW_8;
		break;
	case SNDRV_PCM_FORMAT_A_LAW:
		retval = AD1816A_FMT_ALAW_8;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		retval = AD1816A_FMT_LINEAR_16_LIT;
		break;
	case SNDRV_PCM_FORMAT_S16_BE:
		retval = AD1816A_FMT_LINEAR_16_BIG;
	}
	return (channels > 1) ? (retval | AD1816A_FMT_STEREO) : retval;
}

static int snd_ad1816a_open(struct snd_ad1816a *chip, unsigned int mode)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->lock, flags);

	if (chip->mode & mode) {
		spin_unlock_irqrestore(&chip->lock, flags);
		return -EAGAIN;
	}

	switch ((mode &= AD1816A_MODE_OPEN)) {
	case AD1816A_MODE_PLAYBACK:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_PLAYBACK_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_PLAYBACK_IRQ_ENABLE, 0xffff);
		break;
	case AD1816A_MODE_CAPTURE:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_CAPTURE_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_CAPTURE_IRQ_ENABLE, 0xffff);
		break;
	case AD1816A_MODE_TIMER:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_TIMER_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_TIMER_IRQ_ENABLE, 0xffff);
	}
	chip->mode |= mode;

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

static void snd_ad1816a_close(struct snd_ad1816a *chip, unsigned int mode)
{
	unsigned long flags;

	spin_lock_irqsave(&chip->lock, flags);

	switch ((mode &= AD1816A_MODE_OPEN)) {
	case AD1816A_MODE_PLAYBACK:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_PLAYBACK_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_PLAYBACK_IRQ_ENABLE, 0x0000);
		break;
	case AD1816A_MODE_CAPTURE:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_CAPTURE_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_CAPTURE_IRQ_ENABLE, 0x0000);
		break;
	case AD1816A_MODE_TIMER:
		snd_ad1816a_out_mask(chip, AD1816A_INTERRUPT_STATUS,
			AD1816A_TIMER_IRQ_PENDING, 0x00);
		snd_ad1816a_write_mask(chip, AD1816A_INTERRUPT_ENABLE,
			AD1816A_TIMER_IRQ_ENABLE, 0x0000);
	}
	if (!((chip->mode &= ~mode) & AD1816A_MODE_OPEN))
		chip->mode = 0;

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


static int snd_ad1816a_trigger(struct snd_ad1816a *chip, unsigned char what,
			       int channel, int cmd, int iscapture)
{
	int error = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_STOP:
		spin_lock(&chip->lock);
		cmd = (cmd == SNDRV_PCM_TRIGGER_START) ? 0xff: 0x00;
		/* if (what & AD1816A_PLAYBACK_ENABLE) */
		/* That is not valid, because playback and capture enable
		 * are the same bit pattern, just to different addresses
		 */
		if (! iscapture)
			snd_ad1816a_out_mask(chip, AD1816A_PLAYBACK_CONFIG,
				AD1816A_PLAYBACK_ENABLE, cmd);
		else
			snd_ad1816a_out_mask(chip, AD1816A_CAPTURE_CONFIG,
				AD1816A_CAPTURE_ENABLE, cmd);
		spin_unlock(&chip->lock);
		break;
	default:
		snd_printk(KERN_WARNING "invalid trigger mode 0x%x.\n", what);
		error = -EINVAL;
	}

	return error;
}

static int snd_ad1816a_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	return snd_ad1816a_trigger(chip, AD1816A_PLAYBACK_ENABLE,
				   SNDRV_PCM_STREAM_PLAYBACK, cmd, 0);
}

static int snd_ad1816a_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	return snd_ad1816a_trigger(chip, AD1816A_CAPTURE_ENABLE,
				   SNDRV_PCM_STREAM_CAPTURE, cmd, 1);
}

static int snd_ad1816a_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_ad1816a_hw_free(struct snd_pcm_substream *substream)
{
	return snd_pcm_lib_free_pages(substream);
}

static int snd_ad1816a_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int size, rate;

	spin_lock_irqsave(&chip->lock, flags);

	chip->p_dma_size = size = snd_pcm_lib_buffer_bytes(substream);
	snd_ad1816a_out_mask(chip, AD1816A_PLAYBACK_CONFIG,
		AD1816A_PLAYBACK_ENABLE | AD1816A_PLAYBACK_PIO, 0x00);

	snd_dma_program(chip->dma1, runtime->dma_addr, size,
			DMA_MODE_WRITE | DMA_AUTOINIT);

	rate = runtime->rate;
	if (chip->clock_freq)
		rate = (rate * 33000) / chip->clock_freq;
	snd_ad1816a_write(chip, AD1816A_PLAYBACK_SAMPLE_RATE, rate);
	snd_ad1816a_out_mask(chip, AD1816A_PLAYBACK_CONFIG,
		AD1816A_FMT_ALL | AD1816A_FMT_STEREO,
		snd_ad1816a_get_format(chip, runtime->format,
			runtime->channels));

	snd_ad1816a_write(chip, AD1816A_PLAYBACK_BASE_COUNT,
		snd_pcm_lib_period_bytes(substream) / 4 - 1);

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

static int snd_ad1816a_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	unsigned long flags;
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int size, rate;

	spin_lock_irqsave(&chip->lock, flags);

	chip->c_dma_size = size = snd_pcm_lib_buffer_bytes(substream);
	snd_ad1816a_out_mask(chip, AD1816A_CAPTURE_CONFIG,
		AD1816A_CAPTURE_ENABLE | AD1816A_CAPTURE_PIO, 0x00);

	snd_dma_program(chip->dma2, runtime->dma_addr, size,
			DMA_MODE_READ | DMA_AUTOINIT);

	rate = runtime->rate;
	if (chip->clock_freq)
		rate = (rate * 33000) / chip->clock_freq;
	snd_ad1816a_write(chip, AD1816A_CAPTURE_SAMPLE_RATE, rate);
	snd_ad1816a_out_mask(chip, AD1816A_CAPTURE_CONFIG,
		AD1816A_FMT_ALL | AD1816A_FMT_STEREO,
		snd_ad1816a_get_format(chip, runtime->format,
			runtime->channels));

	snd_ad1816a_write(chip, AD1816A_CAPTURE_BASE_COUNT,
		snd_pcm_lib_period_bytes(substream) / 4 - 1);

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


static snd_pcm_uframes_t snd_ad1816a_playback_pointer(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	if (!(chip->mode & AD1816A_MODE_PLAYBACK))
		return 0;
	ptr = snd_dma_pointer(chip->dma1, chip->p_dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_ad1816a_capture_pointer(struct snd_pcm_substream *substream)
{
	struct snd_ad1816a *chip = snd_pcm_substream_chip(substream);
	size_t ptr;
	if (!(chip->mode & AD1816A_MODE_CAPTURE))
		return 0;
	ptr = snd_dma_pointer(chip->dma2, chip->c_dma_size);
	return bytes_to_frames(substream->runtime, ptr);
}


static irqreturn_t snd_ad1816a_interrupt(int irq, void *dev_id)
{
	struct snd_ad1816a *chip = dev_id;
	unsigned char status;

	spin_lock(&chip->lock);
	status = snd_ad1816a_in(chip, AD1816A_INTERRUPT_STATUS);
	spin_unlock(&chip->lock);

	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,
};

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)
{
	if (snd_BUG_ON(!timer))
		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,
};

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 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);
}

#ifdef CONFIG_PM
void snd_ad1816a_suspend(struct snd_ad1816a *chip)
{
	int reg;
	unsigned long flags;

	snd_pcm_suspend_all(chip->pcm);
	spin_lock_irqsave(&chip->lock, flags);
	for (reg = 0; reg < 48; reg++)
		chip->image[reg] = snd_ad1816a_read(chip, reg);
	spin_unlock_irqrestore(&chip->lock, flags);
}

void snd_ad1816a_resume(struct snd_ad1816a *chip)
{
	int reg;
	unsigned long flags;

	snd_ad1816a_init(chip);
	spin_lock_irqsave(&chip->lock, flags);
	for (reg = 0; reg < 48; reg++)
		snd_ad1816a_write(chip, reg, chip->image[reg]);
	spin_unlock_irqrestore(&chip->lock, flags);
}
#endif

static int 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);
	}
	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 *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(KERN_WARNING "Unknown chip version %d:%d.\n",
			chip->version, chip->hardware);
		return "AD1816A - unknown";
	}
}

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

	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, 0, "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;
	}

	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 = {
	.open =		snd_ad1816a_capture_open,
	.close =	snd_ad1816a_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_ad1816a_hw_params,
	.hw_free =	snd_ad1816a_hw_free,
	.prepare =	snd_ad1816a_capture_prepare,
	.trigger =	snd_ad1816a_capture_trigger,
	.pointer =	snd_ad1816a_capture_pointer,
};

int snd_ad1816a_pcm(struct snd_ad1816a *chip, int device, struct snd_pcm **rpcm)
{
	int error;
	struct snd_pcm *pcm;

	if ((error = snd_pcm_new(chip->card, "AD1816A", device, 1, 1, &pcm)))
		return error;

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1816a_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1816a_capture_ops);

	pcm->private_data = chip;
	pcm->info_flags = (chip->dma1 == chip->dma2 ) ? SNDRV_PCM_INFO_JOINT_DUPLEX : 0;

	strcpy(pcm->name, snd_ad1816a_chip_id(chip));
	snd_ad1816a_init(chip);

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      snd_dma_isa_data(),
					      64*1024, chip->dma1 > 3 || chip->dma2 > 3 ? 128*1024 : 64*1024);

	chip->pcm = pcm;
	if (rpcm)
		*rpcm = pcm;
	return 0;
}

int snd_ad1816a_timer(struct snd_ad1816a *chip, int device,
		      struct snd_timer **rtimer)
{
	struct snd_timer *timer;
	struct snd_timer_id tid;
	int error;

	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
	tid.card = chip->card->number;
	tid.device = device;
	tid.subdevice = 0;
	if ((error = snd_timer_new(chip->card, "AD1816A", &tid, &timer)) < 0)
		return error;
	strcpy(timer->name, snd_ad1816a_chip_id(chip));
	timer->private_data = chip;
	chip->timer = timer;
	timer->hw = snd_ad1816a_timer_table;
	if (rtimer)
		*rtimer = timer;
	return 0;
}

/*
 *
 */

static int snd_ad1816a_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	static char *texts[8] = {
		"Line", "Mix", "CD", "Synth", "Video",
		"Mic", "Phone",
	};

	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
	uinfo->count = 2;
	uinfo->value.enumerated.items = 7;
	if (uinfo->value.enumerated.item > 6)
		uinfo->value.enumerated.item = 6;
	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
	return 0;
}

static int snd_ad1816a_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	unsigned short val;
	
	spin_lock_irqsave(&chip->lock, flags);
	val = snd_ad1816a_read(chip, AD1816A_ADC_SOURCE_SEL);
	spin_unlock_irqrestore(&chip->lock, flags);
	ucontrol->value.enumerated.item[0] = (val >> 12) & 7;
	ucontrol->value.enumerated.item[1] = (val >> 4) & 7;
	return 0;
}

static int snd_ad1816a_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	unsigned short val;
	int change;
	
	if (ucontrol->value.enumerated.item[0] > 6 ||
	    ucontrol->value.enumerated.item[1] > 6)
		return -EINVAL;
	val = (ucontrol->value.enumerated.item[0] << 12) |
	      (ucontrol->value.enumerated.item[1] << 4);
	spin_lock_irqsave(&chip->lock, flags);
	change = snd_ad1816a_read(chip, AD1816A_ADC_SOURCE_SEL) != val;
	snd_ad1816a_write(chip, AD1816A_ADC_SOURCE_SEL, val);
	spin_unlock_irqrestore(&chip->lock, flags);
	return change;
}

#define AD1816A_SINGLE_TLV(xname, reg, shift, mask, invert, xtlv)	\
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
  .name = xname, .info = snd_ad1816a_info_single, \
  .get = snd_ad1816a_get_single, .put = snd_ad1816a_put_single, \
  .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24), \
  .tlv = { .p = (xtlv) } }
#define AD1816A_SINGLE(xname, reg, shift, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .info = snd_ad1816a_info_single, \
  .get = snd_ad1816a_get_single, .put = snd_ad1816a_put_single, \
  .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24) }

static int snd_ad1816a_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 16) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_ad1816a_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	
	spin_lock_irqsave(&chip->lock, flags);
	ucontrol->value.integer.value[0] = (snd_ad1816a_read(chip, reg) >> shift) & mask;
	spin_unlock_irqrestore(&chip->lock, flags);
	if (invert)
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
	return 0;
}

static int snd_ad1816a_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift = (kcontrol->private_value >> 8) & 0xff;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	int change;
	unsigned short old_val, val;
	
	val = (ucontrol->value.integer.value[0] & mask);
	if (invert)
		val = mask - val;
	val <<= shift;
	spin_lock_irqsave(&chip->lock, flags);
	old_val = snd_ad1816a_read(chip, reg);
	val = (old_val & ~(mask << shift)) | val;
	change = val != old_val;
	snd_ad1816a_write(chip, reg, val);
	spin_unlock_irqrestore(&chip->lock, flags);
	return change;
}

#define AD1816A_DOUBLE_TLV(xname, reg, shift_left, shift_right, mask, invert, xtlv) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
  .name = xname, .info = snd_ad1816a_info_double,		\
  .get = snd_ad1816a_get_double, .put = snd_ad1816a_put_double, \
  .private_value = reg | (shift_left << 8) | (shift_right << 12) | (mask << 16) | (invert << 24), \
  .tlv = { .p = (xtlv) } }

#define AD1816A_DOUBLE(xname, reg, shift_left, shift_right, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .info = snd_ad1816a_info_double, \
  .get = snd_ad1816a_get_double, .put = snd_ad1816a_put_double, \
  .private_value = reg | (shift_left << 8) | (shift_right << 12) | (mask << 16) | (invert << 24) }

static int snd_ad1816a_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
	int mask = (kcontrol->private_value >> 16) & 0xff;

	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 2;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = mask;
	return 0;
}

static int snd_ad1816a_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift_left = (kcontrol->private_value >> 8) & 0x0f;
	int shift_right = (kcontrol->private_value >> 12) & 0x0f;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	unsigned short val;
	
	spin_lock_irqsave(&chip->lock, flags);
	val = snd_ad1816a_read(chip, reg);
	ucontrol->value.integer.value[0] = (val >> shift_left) & mask;
	ucontrol->value.integer.value[1] = (val >> shift_right) & mask;
	spin_unlock_irqrestore(&chip->lock, flags);
	if (invert) {
		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
		ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
	}
	return 0;
}

static int snd_ad1816a_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
	struct snd_ad1816a *chip = snd_kcontrol_chip(kcontrol);
	unsigned long flags;
	int reg = kcontrol->private_value & 0xff;
	int shift_left = (kcontrol->private_value >> 8) & 0x0f;
	int shift_right = (kcontrol->private_value >> 12) & 0x0f;
	int mask = (kcontrol->private_value >> 16) & 0xff;
	int invert = (kcontrol->private_value >> 24) & 0xff;
	int change;
	unsigned short old_val, val1, val2;
	
	val1 = ucontrol->value.integer.value[0] & mask;
	val2 = ucontrol->value.integer.value[1] & mask;
	if (invert) {
		val1 = mask - val1;
		val2 = mask - val2;
	}
	val1 <<= shift_left;
	val2 <<= shift_right;
	spin_lock_irqsave(&chip->lock, flags);
	old_val = snd_ad1816a_read(chip, reg);
	val1 = (old_val & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
	change = val1 != old_val;
	snd_ad1816a_write(chip, reg, val1);
	spin_unlock_irqrestore(&chip->lock, flags);
	return change;
}

static const DECLARE_TLV_DB_SCALE(db_scale_4bit, -4500, 300, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_5bit, -4650, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_6bit, -9450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_5bit_12db_max, -3450, 150, 0);
static const DECLARE_TLV_DB_SCALE(db_scale_rec_gain, 0, 150, 0);

static struct snd_kcontrol_new snd_ad1816a_controls[] = {
AD1816A_DOUBLE("Master Playback Switch", AD1816A_MASTER_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("Master Playback Volume", AD1816A_MASTER_ATT, 8, 0, 31, 1,
		   db_scale_5bit),
AD1816A_DOUBLE("PCM Playback Switch", AD1816A_VOICE_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("PCM Playback Volume", AD1816A_VOICE_ATT, 8, 0, 63, 1,
		   db_scale_6bit),
AD1816A_DOUBLE("Line Playback Switch", AD1816A_LINE_GAIN_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("Line Playback Volume", AD1816A_LINE_GAIN_ATT, 8, 0, 31, 1,
		   db_scale_5bit_12db_max),
AD1816A_DOUBLE("CD Playback Switch", AD1816A_CD_GAIN_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("CD Playback Volume", AD1816A_CD_GAIN_ATT, 8, 0, 31, 1,
		   db_scale_5bit_12db_max),
AD1816A_DOUBLE("Synth Playback Switch", AD1816A_SYNTH_GAIN_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("Synth Playback Volume", AD1816A_SYNTH_GAIN_ATT, 8, 0, 31, 1,
		   db_scale_5bit_12db_max),
AD1816A_DOUBLE("FM Playback Switch", AD1816A_FM_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("FM Playback Volume", AD1816A_FM_ATT, 8, 0, 63, 1,
		   db_scale_6bit),
AD1816A_SINGLE("Mic Playback Switch", AD1816A_MIC_GAIN_ATT, 15, 1, 1),
AD1816A_SINGLE_TLV("Mic Playback Volume", AD1816A_MIC_GAIN_ATT, 8, 31, 1,
		   db_scale_5bit_12db_max),
AD1816A_SINGLE("Mic Boost", AD1816A_MIC_GAIN_ATT, 14, 1, 0),
AD1816A_DOUBLE("Video Playback Switch", AD1816A_VID_GAIN_ATT, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("Video Playback Volume", AD1816A_VID_GAIN_ATT, 8, 0, 31, 1,
		   db_scale_5bit_12db_max),
AD1816A_SINGLE("Phone Capture Switch", AD1816A_PHONE_IN_GAIN_ATT, 15, 1, 1),
AD1816A_SINGLE_TLV("Phone Capture Volume", AD1816A_PHONE_IN_GAIN_ATT, 0, 15, 1,
		   db_scale_4bit),
AD1816A_SINGLE("Phone Playback Switch", AD1816A_PHONE_OUT_ATT, 7, 1, 1),
AD1816A_SINGLE_TLV("Phone Playback Volume", AD1816A_PHONE_OUT_ATT, 0, 31, 1,
		   db_scale_5bit),
{
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Capture Source",
	.info = snd_ad1816a_info_mux,
	.get = snd_ad1816a_get_mux,
	.put = snd_ad1816a_put_mux,
},
AD1816A_DOUBLE("Capture Switch", AD1816A_ADC_PGA, 15, 7, 1, 1),
AD1816A_DOUBLE_TLV("Capture Volume", AD1816A_ADC_PGA, 8, 0, 15, 0,
		   db_scale_rec_gain),
AD1816A_SINGLE("3D Control - Switch", AD1816A_3D_PHAT_CTRL, 15, 1, 1),
AD1816A_SINGLE("3D Control - Level", AD1816A_3D_PHAT_CTRL, 0, 15, 0),
};
                                        
int snd_ad1816a_mixer(struct snd_ad1816a *chip)
{
	struct snd_card *card;
	unsigned int idx;
	int err;

	if (snd_BUG_ON(!chip || !chip->card))
		return -EINVAL;

	card = chip->card;

	strcpy(card->mixername, snd_ad1816a_chip_id(chip));

	for (idx = 0; idx < ARRAY_SIZE(snd_ad1816a_controls); idx++) {
		if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_ad1816a_controls[idx], chip))) < 0)
			return err;
	}
	return 0;
}