text: /*
   *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   *  Routines for control of AD1848/AD1847/CS4248
   *
   *
   *   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
   *
   */
  
  #define SNDRV_MAIN_OBJECT_FILE
  #include <sound/driver.h>
  #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/ad1848.h>
  #include <sound/control.h>
  #include <sound/pcm_params.h>
  
  #include <asm/io.h>
  #include <asm/dma.h>
  
  MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  MODULE_DESCRIPTION("Routines for control of AD1848/AD1847/CS4248");
  MODULE_LICENSE("GPL");
  
  #if 0
  #define SNDRV_DEBUG_MCE
  #endif
  
  /*
   *  Some variables
   */
  
  static unsigned char freq_bits[14] = {
  	/* 5510 */	0x00 | AD1848_XTAL2,
  	/* 6620 */	0x0E | AD1848_XTAL2,
  	/* 8000 */	0x00 | AD1848_XTAL1,
  	/* 9600 */	0x0E | AD1848_XTAL1,
  	/* 11025 */	0x02 | AD1848_XTAL2,
  	/* 16000 */	0x02 | AD1848_XTAL1,
  	/* 18900 */	0x04 | AD1848_XTAL2,
  	/* 22050 */	0x06 | AD1848_XTAL2,
  	/* 27042 */	0x04 | AD1848_XTAL1,
  	/* 32000 */	0x06 | AD1848_XTAL1,
  	/* 33075 */	0x0C | AD1848_XTAL2,
  	/* 37800 */	0x08 | AD1848_XTAL2,
  	/* 44100 */	0x0A | AD1848_XTAL2,
  	/* 48000 */	0x0C | AD1848_XTAL1
  };
  
  static unsigned int rates[14] = {
  	5510, 6620, 8000, 9600, 11025, 16000, 18900, 22050,
  	27042, 32000, 33075, 37800, 44100, 48000
  };
  
  static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
  	.count = 14,
  	.list = rates,
  	.mask = 0,
  };
  
  static unsigned char snd_ad1848_original_image[16] =
  {
  	0x00,			/* 00 - lic */
  	0x00,			/* 01 - ric */
  	0x9f,			/* 02 - la1ic */
  	0x9f,			/* 03 - ra1ic */
  	0x9f,			/* 04 - la2ic */
  	0x9f,			/* 05 - ra2ic */
  	0xbf,			/* 06 - loc */
  	0xbf,			/* 07 - roc */
  	0x20,			/* 08 - dfr */
  	AD1848_AUTOCALIB,	/* 09 - ic */
  	0x00,			/* 0a - pc */
  	0x00,			/* 0b - ti */
  	0x00,			/* 0c - mi */
  	0x00,			/* 0d - lbc */
  	0x00,			/* 0e - dru */
  	0x00,			/* 0f - drl */
  };
  
  /*
   *  Basic I/O functions
   */
  
  void snd_ad1848_out(struct snd_ad1848 *chip,
  			   unsigned char reg,
  			   unsigned char value)
  {
  	int timeout;
  
  	for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
  		udelay(100);
  #ifdef CONFIG_SND_DEBUG
  	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
  		snd_printk(KERN_WARNING "auto calibration time out - reg = 0x%x, value = 0x%x\n", reg, value);
  #endif
  	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
  	outb(chip->image[reg] = value, AD1848P(chip, REG));
  	mb();
  #if 0
  	printk("codec out - reg 0x%x = 0x%x\n", chip->mce_bit | reg, value);
  #endif
  }
  
  static void snd_ad1848_dout(struct snd_ad1848 *chip,
  			    unsigned char reg, unsigned char value)
  {
  	int timeout;
  
  	for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
  		udelay(100);
  	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
  	outb(value, AD1848P(chip, REG));
  	mb();
  }
  
  static unsigned char snd_ad1848_in(struct snd_ad1848 *chip, unsigned char reg)
  {
  	int timeout;
  
  	for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
  		udelay(100);
  #ifdef CONFIG_SND_DEBUG
  	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
  		snd_printk(KERN_WARNING "auto calibration time out - reg = 0x%x\n", reg);
  #endif
  	outb(chip->mce_bit | reg, AD1848P(chip, REGSEL));
  	mb();
  	return inb(AD1848P(chip, REG));
  }
  
  #if 0
  
  static void snd_ad1848_debug(struct snd_ad1848 *chip)
  {
  	printk("AD1848 REGS:      INDEX = 0x%02x  ", inb(AD1848P(chip, REGSEL)));
  	printk("                 STATUS = 0x%02x\n", inb(AD1848P(chip, STATUS)));
  	printk("  0x00: left input      = 0x%02x  ", snd_ad1848_in(chip, 0x00));
  	printk("  0x08: playback format = 0x%02x\n", snd_ad1848_in(chip, 0x08));
  	printk("  0x01: right input     = 0x%02x  ", snd_ad1848_in(chip, 0x01));
  	printk("  0x09: iface (CFIG 1)  = 0x%02x\n", snd_ad1848_in(chip, 0x09));
  	printk("  0x02: AUXA left       = 0x%02x  ", snd_ad1848_in(chip, 0x02));
  	printk("  0x0a: pin control     = 0x%02x\n", snd_ad1848_in(chip, 0x0a));
  	printk("  0x03: AUXA right      = 0x%02x  ", snd_ad1848_in(chip, 0x03));
  	printk("  0x0b: init & status   = 0x%02x\n", snd_ad1848_in(chip, 0x0b));
  	printk("  0x04: AUXB left       = 0x%02x  ", snd_ad1848_in(chip, 0x04));
  	printk("  0x0c: revision & mode = 0x%02x\n", snd_ad1848_in(chip, 0x0c));
  	printk("  0x05: AUXB right      = 0x%02x  ", snd_ad1848_in(chip, 0x05));
  	printk("  0x0d: loopback        = 0x%02x\n", snd_ad1848_in(chip, 0x0d));
  	printk("  0x06: left output     = 0x%02x  ", snd_ad1848_in(chip, 0x06));
  	printk("  0x0e: data upr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0e));
  	printk("  0x07: right output    = 0x%02x  ", snd_ad1848_in(chip, 0x07));
  	printk("  0x0f: data lwr count  = 0x%02x\n", snd_ad1848_in(chip, 0x0f));
  }
  
  #endif
  
  /*
   *  AD1848 detection / MCE routines
   */
  
  static void snd_ad1848_mce_up(struct snd_ad1848 *chip)
  {
  	unsigned long flags;
  	int timeout;
  
  	for (timeout = 250; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
  		udelay(100);
  #ifdef CONFIG_SND_DEBUG
  	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
  		snd_printk(KERN_WARNING "mce_up - auto calibration time out (0)\n");
  #endif
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	chip->mce_bit |= AD1848_MCE;
  	timeout = inb(AD1848P(chip, REGSEL));
  	if (timeout == 0x80)
  		snd_printk(KERN_WARNING "mce_up [0x%lx]: serious init problem - codec still busy\n", chip->port);
  	if (!(timeout & AD1848_MCE))
  		outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL));
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  }
  
  static void snd_ad1848_mce_down(struct snd_ad1848 *chip)
  {
  	unsigned long flags;
  	int timeout;
  	signed long time;
  
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	for (timeout = 5; timeout > 0; timeout--)
  		inb(AD1848P(chip, REGSEL));
  	/* end of cleanup sequence */
  	for (timeout = 12000; timeout > 0 && (inb(AD1848P(chip, REGSEL)) & AD1848_INIT); timeout--)
  		udelay(100);
  #if 0
  	printk("(1) timeout = %i\n", timeout);
  #endif
  #ifdef CONFIG_SND_DEBUG
  	if (inb(AD1848P(chip, REGSEL)) & AD1848_INIT)
  		snd_printk(KERN_WARNING "mce_down [0x%lx] - auto calibration time out (0)\n", AD1848P(chip, REGSEL));
  #endif
  	chip->mce_bit &= ~AD1848_MCE;
  	timeout = inb(AD1848P(chip, REGSEL));
  	outb(chip->mce_bit | (timeout & 0x1f), AD1848P(chip, REGSEL));
  	if (timeout == 0x80)
  		snd_printk(KERN_WARNING "mce_down [0x%lx]: serious init problem - codec still busy\n", chip->port);
  	if ((timeout & AD1848_MCE) == 0) {
  		spin_unlock_irqrestore(&chip->reg_lock, flags);
  		return;
  	}
  	/* calibration process */
  
  	for (timeout = 500; timeout > 0 && (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0; timeout--);
  	if ((snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) == 0) {
  		snd_printd("mce_down - auto calibration time out (1)\n");
  		spin_unlock_irqrestore(&chip->reg_lock, flags);
  		return;
  	}
  #if 0
  	printk("(2) timeout = %i, jiffies = %li\n", timeout, jiffies);
  #endif
  	time = HZ / 4;
  	while (snd_ad1848_in(chip, AD1848_TEST_INIT) & AD1848_CALIB_IN_PROGRESS) {
  		spin_unlock_irqrestore(&chip->reg_lock, flags);
  		if (time <= 0) {
  			snd_printk(KERN_ERR "mce_down - auto calibration time out (2)\n");
  			return;
  		}
  		time = schedule_timeout_interruptible(time);
  		spin_lock_irqsave(&chip->reg_lock, flags);
  	}
  #if 0
  	printk("(3) jiffies = %li\n", jiffies);
  #endif
  	time = HZ / 10;
  	while (inb(AD1848P(chip, REGSEL)) & AD1848_INIT) {
  		spin_unlock_irqrestore(&chip->reg_lock, flags);
  		if (time <= 0) {
  			snd_printk(KERN_ERR "mce_down - auto calibration time out (3)\n");
  			return;
  		}
  		time = schedule_timeout_interruptible(time);
  		spin_lock_irqsave(&chip->reg_lock, flags);
  	}
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  #if 0
  	printk("(4) jiffies = %li\n", jiffies);
  	snd_printk("mce_down - exit = 0x%x\n", inb(AD1848P(chip, REGSEL)));
  #endif
  }
  
  static unsigned int snd_ad1848_get_count(unsigned char format,
  				         unsigned int size)
  {
  	switch (format & 0xe0) {
  	case AD1848_LINEAR_16:
  		size >>= 1;
  		break;
  	}
  	if (format & AD1848_STEREO)
  		size >>= 1;
  	return size;
  }
  
  static int snd_ad1848_trigger(struct snd_ad1848 *chip, unsigned char what,
  			      int channel, int cmd)
  {
  	int result = 0;
  
  #if 0
  	printk("codec trigger!!! - what = %i, enable = %i, status = 0x%x\n", what, enable, inb(AD1848P(card, STATUS)));
  #endif
  	spin_lock(&chip->reg_lock);
  	if (cmd == SNDRV_PCM_TRIGGER_START) {
  		if (chip->image[AD1848_IFACE_CTRL] & what) {
  			spin_unlock(&chip->reg_lock);
  			return 0;
  		}
  		snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] |= what);
  		chip->mode |= AD1848_MODE_RUNNING;
  	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
  		if (!(chip->image[AD1848_IFACE_CTRL] & what)) {
  			spin_unlock(&chip->reg_lock);
  			return 0;
  		}
  		snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL] &= ~what);
  		chip->mode &= ~AD1848_MODE_RUNNING;
  	} else {
  		result = -EINVAL;
  	}
  	spin_unlock(&chip->reg_lock);
  	return result;
  }
  
  /*
   *  CODEC I/O
   */
  
  static unsigned char snd_ad1848_get_rate(unsigned int rate)
  {
  	int i;
  
  	for (i = 0; i < 14; i++)
  		if (rate == rates[i])
  			return freq_bits[i];
  	snd_BUG();
  	return freq_bits[13];
  }
  
  static int snd_ad1848_ioctl(struct snd_pcm_substream *substream,
  			    unsigned int cmd, void *arg)
  {
  	return snd_pcm_lib_ioctl(substream, cmd, arg);
  }
  
  static unsigned char snd_ad1848_get_format(int format, int channels)
  {
  	unsigned char rformat;
  
  	rformat = AD1848_LINEAR_8;
  	switch (format) {
  	case SNDRV_PCM_FORMAT_A_LAW:	rformat = AD1848_ALAW_8; break;
  	case SNDRV_PCM_FORMAT_MU_LAW:	rformat = AD1848_ULAW_8; break;
  	case SNDRV_PCM_FORMAT_S16_LE:	rformat = AD1848_LINEAR_16; break;
  	}
  	if (channels > 1)
  		rformat |= AD1848_STEREO;
  #if 0
  	snd_printk("get_format: 0x%x (mode=0x%x)\n", format, mode);
  #endif
  	return rformat;
  }
  
  static void snd_ad1848_calibrate_mute(struct snd_ad1848 *chip, int mute)
  {
  	unsigned long flags;
  	
  	mute = mute ? 1 : 0;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	if (chip->calibrate_mute == mute) {
  		spin_unlock_irqrestore(&chip->reg_lock, flags);
  		return;
  	}
  	if (!mute) {
  		snd_ad1848_dout(chip, AD1848_LEFT_INPUT, chip->image[AD1848_LEFT_INPUT]);
  		snd_ad1848_dout(chip, AD1848_RIGHT_INPUT, chip->image[AD1848_RIGHT_INPUT]);
  	}
  	snd_ad1848_dout(chip, AD1848_AUX1_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_LEFT_INPUT]);
  	snd_ad1848_dout(chip, AD1848_AUX1_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX1_RIGHT_INPUT]);
  	snd_ad1848_dout(chip, AD1848_AUX2_LEFT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_LEFT_INPUT]);
  	snd_ad1848_dout(chip, AD1848_AUX2_RIGHT_INPUT, mute ? 0x80 : chip->image[AD1848_AUX2_RIGHT_INPUT]);
  	snd_ad1848_dout(chip, AD1848_LEFT_OUTPUT, mute ? 0x80 : chip->image[AD1848_LEFT_OUTPUT]);
  	snd_ad1848_dout(chip, AD1848_RIGHT_OUTPUT, mute ? 0x80 : chip->image[AD1848_RIGHT_OUTPUT]);
  	chip->calibrate_mute = mute;
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  }
  
  static void snd_ad1848_set_data_format(struct snd_ad1848 *chip, struct snd_pcm_hw_params *hw_params)
  {
  	if (hw_params == NULL) {
  		chip->image[AD1848_DATA_FORMAT] = 0x20;
  	} else {
  		chip->image[AD1848_DATA_FORMAT] =
  		    snd_ad1848_get_format(params_format(hw_params), params_channels(hw_params)) |
  		    snd_ad1848_get_rate(params_rate(hw_params));
  	}
  	// snd_printk(">>> pmode = 0x%x, dfr = 0x%x\n", pstr->mode, chip->image[AD1848_DATA_FORMAT]);
  }
  
  static int snd_ad1848_open(struct snd_ad1848 *chip, unsigned int mode)
  {
  	unsigned long flags;
  
  	down(&chip->open_mutex);
  	if (chip->mode & AD1848_MODE_OPEN) {
  		up(&chip->open_mutex);
  		return -EAGAIN;
  	}
  	snd_ad1848_mce_down(chip);
  
  #ifdef SNDRV_DEBUG_MCE
  	snd_printk("open: (1)\n");
  #endif
  	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 |
  			     AD1848_CALIB_MODE);
  	chip->image[AD1848_IFACE_CTRL] |= AD1848_AUTOCALIB;
  	snd_ad1848_out(chip, AD1848_IFACE_CTRL, chip->image[AD1848_IFACE_CTRL]);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	snd_ad1848_mce_down(chip);
  
  #ifdef SNDRV_DEBUG_MCE
  	snd_printk("open: (2)\n");
  #endif
  
  	snd_ad1848_set_data_format(chip, NULL);
  
  	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);
  
  #ifdef SNDRV_DEBUG_MCE
  	snd_printk("open: (3)\n");
  #endif
  
  	/* 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(struct snd_ad1848 *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(struct snd_pcm_substream *substream,
  				       int cmd)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream,
  				      int cmd)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream,
  					 struct snd_pcm_hw_params *hw_params)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream)
  {
  	return snd_pcm_lib_free_pages(substream);
  }
  
  static int snd_ad1848_playback_prepare(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *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(struct snd_pcm_substream *substream,
  					struct snd_pcm_hw_params *hw_params)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream)
  {
  	return snd_pcm_lib_free_pages(substream);
  }
  
  static int snd_ad1848_capture_prepare(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *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)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *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(struct snd_ad1848 *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 void snd_ad1848_suspend(struct snd_ad1848 *chip)
  {
  	snd_pcm_suspend_all(chip->pcm);
  	if (chip->thinkpad_flag)
  		snd_ad1848_thinkpad_twiddle(chip, 0);
  }
  
  static void snd_ad1848_resume(struct snd_ad1848 *chip)
  {
  	int i;
  
  	if (chip->thinkpad_flag)
  		snd_ad1848_thinkpad_twiddle(chip, 1);
  
  	/* clear any pendings IRQ */
  	inb(AD1848P(chip, STATUS));
  	outb(0, AD1848P(chip, STATUS));
  	mb();
  
  	snd_ad1848_mce_down(chip);
  	for (i = 0; i < 16; i++)
  		snd_ad1848_out(chip, i, chip->image[i]);
  	snd_ad1848_mce_up(chip);
  	snd_ad1848_mce_down(chip);
  }
  #endif /* CONFIG_PM */
  
  static int snd_ad1848_probe(struct snd_ad1848 * 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 struct snd_pcm_hardware 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 struct snd_pcm_hardware 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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *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(struct snd_pcm_substream *substream)
  {
  	struct snd_ad1848 *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(struct snd_ad1848 *chip)
  {
  	release_and_free_resource(chip->res_port);
  	if (chip->irq >= 0)
  		free_irq(chip->irq, (void *) chip);
  	if (chip->dma >= 0) {
  		snd_dma_disable(chip->dma);
  		free_dma(chip->dma);
  	}
  	kfree(chip);
  	return 0;
  }
  
  static int snd_ad1848_dev_free(struct snd_device *device)
  {
  	struct snd_ad1848 *chip = device->device_data;
  	return snd_ad1848_free(chip);
  }
  
  static const char *snd_ad1848_chip_id(struct snd_ad1848 *chip)
  {
  	switch (chip->hardware) {
  	case AD1848_HW_AD1847:	return "AD1847";
  	case AD1848_HW_AD1848:	return "AD1848";
  	case AD1848_HW_CS4248:	return "CS4248";
  	case AD1848_HW_CMI8330: return "CMI8330/C3D";
  	default:		return "???";
  	}
  }
  
  int snd_ad1848_create(struct snd_card *card,
  		      unsigned long port,
  		      int irq, int dma,
  		      unsigned short hardware,
  		      struct snd_ad1848 ** rchip)
  {
  	static struct snd_device_ops ops = {
  		.dev_free =	snd_ad1848_dev_free,
  	};
  	struct snd_ad1848 *chip;
  	int err;
  
  	*rchip = NULL;
  	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
  	if (chip == NULL)
  		return -ENOMEM;
  	spin_lock_init(&chip->reg_lock);
  	init_MUTEX(&chip->open_mutex);
  	chip->card = card;
  	chip->port = port;
  	chip->irq = -1;
  	chip->dma = -1;
  	chip->hardware = hardware;
  	memcpy(&chip->image, &snd_ad1848_original_image, sizeof(snd_ad1848_original_image));
  	
  	if ((chip->res_port = request_region(port, 4, "AD1848")) == NULL) {
  		snd_printk(KERN_ERR "ad1848: can't grab port 0x%lx\n", port);
  		snd_ad1848_free(chip);
  		return -EBUSY;
  	}
  	if (request_irq(irq, snd_ad1848_interrupt, SA_INTERRUPT, "AD1848", (void *) chip)) {
  		snd_printk(KERN_ERR "ad1848: can't grab IRQ %d\n", irq);
  		snd_ad1848_free(chip);
  		return -EBUSY;
  	}
  	chip->irq = irq;
  	if (request_dma(dma, "AD1848")) {
  		snd_printk(KERN_ERR "ad1848: can't grab DMA %d\n", dma);
  		snd_ad1848_free(chip);
  		return -EBUSY;
  	}
  	chip->dma = dma;
  
  	if (hardware == AD1848_HW_THINKPAD) {
  		chip->thinkpad_flag = 1;
  		chip->hardware = AD1848_HW_DETECT; /* reset */
  		snd_ad1848_thinkpad_twiddle(chip, 1);
  	}
  
  	if (snd_ad1848_probe(chip) < 0) {
  		snd_ad1848_free(chip);
  		return -ENODEV;
  	}
  
  	/* Register device */
  	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
  		snd_ad1848_free(chip);
  		return err;
  	}
  
  #ifdef CONFIG_PM
  	chip->suspend = snd_ad1848_suspend;
  	chip->resume = snd_ad1848_resume;
  #endif
  
  	*rchip = chip;
  	return 0;
  }
  
  static struct snd_pcm_ops snd_ad1848_playback_ops = {
  	.open =		snd_ad1848_playback_open,
  	.close =	snd_ad1848_playback_close,
  	.ioctl =	snd_ad1848_ioctl,
  	.hw_params =	snd_ad1848_playback_hw_params,
  	.hw_free =	snd_ad1848_playback_hw_free,
  	.prepare =	snd_ad1848_playback_prepare,
  	.trigger =	snd_ad1848_playback_trigger,
  	.pointer =	snd_ad1848_playback_pointer,
  };
  
  static struct snd_pcm_ops snd_ad1848_capture_ops = {
  	.open =		snd_ad1848_capture_open,
  	.close =	snd_ad1848_capture_close,
  	.ioctl =	snd_ad1848_ioctl,
  	.hw_params =	snd_ad1848_capture_hw_params,
  	.hw_free =	snd_ad1848_capture_hw_free,
  	.prepare =	snd_ad1848_capture_prepare,
  	.trigger =	snd_ad1848_capture_trigger,
  	.pointer =	snd_ad1848_capture_pointer,
  };
  
  int snd_ad1848_pcm(struct snd_ad1848 *chip, int device, struct snd_pcm **rpcm)
  {
  	struct snd_pcm *pcm;
  	int err;
  
  	if ((err = snd_pcm_new(chip->card, "AD1848", device, 1, 1, &pcm)) < 0)
  		return err;
  
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ad1848_playback_ops);
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ad1848_capture_ops);
  
  	pcm->private_data = chip;
  	pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
  	strcpy(pcm->name, snd_ad1848_chip_id(chip));
  
  	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
  					      snd_dma_isa_data(),
  					      64*1024, chip->dma > 3 ? 128*1024 : 64*1024);
  
  	chip->pcm = pcm;
  	if (rpcm)
  		*rpcm = pcm;
  	return 0;
  }
  
  const struct snd_pcm_ops *snd_ad1848_get_pcm_ops(int direction)
  {
  	return direction == SNDRV_PCM_STREAM_PLAYBACK ?
  		&snd_ad1848_playback_ops : &snd_ad1848_capture_ops;
  }
  
  /*
   *  MIXER part
   */
  
  static int snd_ad1848_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
  {
  	static char *texts[4] = {
  		"Line", "Aux", "Mic", "Mix"
  	};
  
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
  	uinfo->count = 2;
  	uinfo->value.enumerated.items = 4;
  	if (uinfo->value.enumerated.item > 3)
  		uinfo->value.enumerated.item = 3;
  	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
  	return 0;
  }
  
  static int snd_ad1848_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned long flags;
  	
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	ucontrol->value.enumerated.item[0] = (chip->image[AD1848_LEFT_INPUT] & AD1848_MIXS_ALL) >> 6;
  	ucontrol->value.enumerated.item[1] = (chip->image[AD1848_RIGHT_INPUT] & AD1848_MIXS_ALL) >> 6;
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	return 0;
  }
  
  static int snd_ad1848_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned long flags;
  	unsigned short left, right;
  	int change;
  	
  	if (ucontrol->value.enumerated.item[0] > 3 ||
  	    ucontrol->value.enumerated.item[1] > 3)
  		return -EINVAL;
  	left = ucontrol->value.enumerated.item[0] << 6;
  	right = ucontrol->value.enumerated.item[1] << 6;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	left = (chip->image[AD1848_LEFT_INPUT] & ~AD1848_MIXS_ALL) | left;
  	right = (chip->image[AD1848_RIGHT_INPUT] & ~AD1848_MIXS_ALL) | right;
  	change = left != chip->image[AD1848_LEFT_INPUT] ||
  	         right != chip->image[AD1848_RIGHT_INPUT];
  	snd_ad1848_out(chip, AD1848_LEFT_INPUT, left);
  	snd_ad1848_out(chip, AD1848_RIGHT_INPUT, right);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	return change;
  }
  
  static int snd_ad1848_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_ad1848_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *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->reg_lock, flags);
  	ucontrol->value.integer.value[0] = (chip->image[reg] >> shift) & mask;
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	if (invert)
  		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
  	return 0;
  }
  
  static int snd_ad1848_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *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 val;
  	
  	val = (ucontrol->value.integer.value[0] & mask);
  	if (invert)
  		val = mask - val;
  	val <<= shift;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	val = (chip->image[reg] & ~(mask << shift)) | val;
  	change = val != chip->image[reg];
  	snd_ad1848_out(chip, reg, val);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	return change;
  }
  
  static int snd_ad1848_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
  {
  	int mask = (kcontrol->private_value >> 24) & 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_ad1848_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned long flags;
  	int left_reg = kcontrol->private_value & 0xff;
  	int right_reg = (kcontrol->private_value >> 8) & 0xff;
  	int shift_left = (kcontrol->private_value >> 16) & 0x07;
  	int shift_right = (kcontrol->private_value >> 19) & 0x07;
  	int mask = (kcontrol->private_value >> 24) & 0xff;
  	int invert = (kcontrol->private_value >> 22) & 1;
  	
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	ucontrol->value.integer.value[0] = (chip->image[left_reg] >> shift_left) & mask;
  	ucontrol->value.integer.value[1] = (chip->image[right_reg] >> shift_right) & mask;
  	spin_unlock_irqrestore(&chip->reg_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_ad1848_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_ad1848 *chip = snd_kcontrol_chip(kcontrol);
  	unsigned long flags;
  	int left_reg = kcontrol->private_value & 0xff;
  	int right_reg = (kcontrol->private_value >> 8) & 0xff;
  	int shift_left = (kcontrol->private_value >> 16) & 0x07;
  	int shift_right = (kcontrol->private_value >> 19) & 0x07;
  	int mask = (kcontrol->private_value >> 24) & 0xff;
  	int invert = (kcontrol->private_value >> 22) & 1;
  	int change;
  	unsigned short 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->reg_lock, flags);
  	if (left_reg != right_reg) {
  		val1 = (chip->image[left_reg] & ~(mask << shift_left)) | val1;
  		val2 = (chip->image[right_reg] & ~(mask << shift_right)) | val2;
  		change = val1 != chip->image[left_reg] || val2 != chip->image[right_reg];
  		snd_ad1848_out(chip, left_reg, val1);
  		snd_ad1848_out(chip, right_reg, val2);
  	} else {
  		val1 = (chip->image[left_reg] & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
  		change = val1 != chip->image[left_reg];
  		snd_ad1848_out(chip, left_reg, val1);		
  	}
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	return change;
  }
  
  /*
   */
  int snd_ad1848_add_ctl(struct snd_ad1848 *chip, const char *name, int index, int type, unsigned long value)
  {
  	static struct snd_kcontrol_new newctls[] = {
  		[AD1848_MIX_SINGLE] = {
  			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  			.info = snd_ad1848_info_single,
  			.get = snd_ad1848_get_single,
  			.put = snd_ad1848_put_single,
  		},
  		[AD1848_MIX_DOUBLE] = {
  			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  			.info = snd_ad1848_info_double,
  			.get = snd_ad1848_get_double,
  			.put = snd_ad1848_put_double,
  		},
  		[AD1848_MIX_CAPTURE] = {
  			.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  			.info = snd_ad1848_info_mux,
  			.get = snd_ad1848_get_mux,
  			.put = snd_ad1848_put_mux,
  		},
  	};
  	struct snd_kcontrol *ctl;
  	int err;
  
  	ctl = snd_ctl_new1(&newctls[type], chip);
  	if (! ctl)
  		return -ENOMEM;
  	strlcpy(ctl->id.name, name, sizeof(ctl->id.name));
  	ctl->id.index = index;
  	ctl->private_value = value;
  	if ((err = snd_ctl_add(chip->card, ctl)) < 0) {
  		snd_ctl_free_one(ctl);
  		return err;
  	}
  	return 0;
  }
  
  
  static struct ad1848_mix_elem snd_ad1848_controls[] = {
  AD1848_DOUBLE("PCM Playback Switch", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 7, 7, 1, 1),
  AD1848_DOUBLE("PCM Playback Volume", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 0, 0, 63, 1),
  AD1848_DOUBLE("Aux Playback Switch", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
  AD1848_DOUBLE("Aux Playback Volume", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 0, 0, 31, 1),
  AD1848_DOUBLE("Aux Playback Switch", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
  AD1848_DOUBLE("Aux Playback Volume", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 0, 0, 31, 1),
  AD1848_DOUBLE("Capture Volume", 0, AD1848_LEFT_INPUT, AD1848_RIGHT_INPUT, 0, 0, 15, 0),
  {
  	.name = "Capture Source",
  	.type = AD1848_MIX_CAPTURE,
  },
  AD1848_SINGLE("Loopback Capture Switch", 0, AD1848_LOOPBACK, 0, 1, 0),
  AD1848_SINGLE("Loopback Capture Volume", 0, AD1848_LOOPBACK, 1, 63, 0)
  };
                                          
  int snd_ad1848_mixer(struct snd_ad1848 *chip)
  {
  	struct snd_card *card;
  	struct snd_pcm *pcm;
  	unsigned int idx;
  	int err;
  
  	snd_assert(chip != NULL && chip->pcm != NULL, return -EINVAL);
  
  	pcm = chip->pcm;
  	card = chip->card;
  
  	strcpy(card->mixername, pcm->name);
  
  	for (idx = 0; idx < ARRAY_SIZE(snd_ad1848_controls); idx++)
  		if ((err = snd_ad1848_add_ctl_elem(chip, &snd_ad1848_controls[idx])) < 0)
  			return err;
  
  	return 0;
  }
  
  EXPORT_SYMBOL(snd_ad1848_out);
  EXPORT_SYMBOL(snd_ad1848_create);
  EXPORT_SYMBOL(snd_ad1848_pcm);
  EXPORT_SYMBOL(snd_ad1848_get_pcm_ops);
  EXPORT_SYMBOL(snd_ad1848_mixer);
  EXPORT_SYMBOL(snd_ad1848_add_ctl);
  
  /*
   *  INIT part
   */
  
  static int __init alsa_ad1848_init(void)
  {
  	return 0;
  }
  
  static void __exit alsa_ad1848_exit(void)
  {
  }
  
  module_init(alsa_ad1848_init)
  module_exit(alsa_ad1848_exit)
  