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ad1848_lib.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <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/tlv.h>
#include <sound/pcm_params.h>

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

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.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 = ARRAY_SIZE(rates),
      .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
 */

static void snd_ad1848_wait(struct snd_ad1848 *chip)
{
      int timeout;

      for (timeout = 250; timeout > 0; timeout--) {
            if ((inb(AD1848P(chip, REGSEL)) & AD1848_INIT) == 0)
                  break;
            udelay(100);
      }
}

void snd_ad1848_out(struct snd_ad1848 *chip,
                     unsigned char reg,
                     unsigned char value)
{
      snd_ad1848_wait(chip);
#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();
      snd_printdd("codec out - reg 0x%x = 0x%x\n",
                  chip->mce_bit | reg, value);
}

EXPORT_SYMBOL(snd_ad1848_out);

static void snd_ad1848_dout(struct snd_ad1848 *chip,
                      unsigned char reg, unsigned char value)
{
      snd_ad1848_wait(chip);
      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)
{
      snd_ad1848_wait(chip);
#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;

      snd_ad1848_wait(chip);
#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, timeout;
      int reg;

      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);

      snd_printdd("(1) timeout = %ld\n", timeout);

#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;
      reg = inb(AD1848P(chip, REGSEL));
      outb(chip->mce_bit | (reg & 0x1f), AD1848P(chip, REGSEL));
      if (reg == 0x80)
            snd_printk(KERN_WARNING "mce_down [0x%lx]: serious init problem - codec still busy\n", chip->port);
      if ((reg & AD1848_MCE) == 0) {
            spin_unlock_irqrestore(&chip->reg_lock, flags);
            return;
      }

      /*
       * Wait for auto-calibration (AC) process to finish, i.e. ACI to go low.
       * It may take up to 5 sample periods (at most 907 us @ 5.5125 kHz) for
       * the process to _start_, so it is important to wait at least that long
       * before checking.  Otherwise we might think AC has finished when it
       * has in fact not begun.  It could take 128 (no AC) or 384 (AC) cycles
       * for ACI to drop.  This gives a wait of at most 70 ms with a more
       * typical value of 3-9 ms.
       */
      timeout = jiffies + msecs_to_jiffies(250);
      do {
            spin_unlock_irqrestore(&chip->reg_lock, flags);
            msleep(1);
            spin_lock_irqsave(&chip->reg_lock, flags);
            reg = snd_ad1848_in(chip, AD1848_TEST_INIT) &
                  AD1848_CALIB_IN_PROGRESS;
      } while (reg && time_before(jiffies, timeout));
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      if (reg)
            snd_printk(KERN_ERR
                     "mce_down - auto calibration time out (2)\n");

      snd_printdd("(4) jiffies = %lu\n", jiffies);
      snd_printd("mce_down - exit = 0x%x\n", inb(AD1848P(chip, REGSEL)));
}

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 < ARRAY_SIZE(rates); i++)
            if (rate == rates[i])
                  return freq_bits[i];
      snd_BUG();
      return freq_bits[ARRAY_SIZE(rates) - 1];
}

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;

      if (chip->mode & AD1848_MODE_OPEN)
            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;

      return 0;
}

static void snd_ad1848_close(struct snd_ad1848 *chip)
{
      unsigned long flags;

      if (!chip->mode)
            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;
}

/*
 *  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 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);
      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, IRQF_DISABLED, "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;
}

EXPORT_SYMBOL(snd_ad1848_create);

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;
}

EXPORT_SYMBOL(snd_ad1848_pcm);

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;
}

EXPORT_SYMBOL(snd_ad1848_get_pcm_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_elem(struct snd_ad1848 *chip,
                      const struct ad1848_mix_elem *c)
{
      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[c->type], chip);
      if (! ctl)
            return -ENOMEM;
      strlcpy(ctl->id.name, c->name, sizeof(ctl->id.name));
      ctl->id.index = c->index;
      ctl->private_value = c->private_value;
      if (c->tlv) {
            ctl->vd[0].access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
            ctl->tlv.p = c->tlv;
      }
      if ((err = snd_ctl_add(chip->card, ctl)) < 0)
            return err;
      return 0;
}

EXPORT_SYMBOL(snd_ad1848_add_ctl_elem);

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 ad1848_mix_elem snd_ad1848_controls[] = {
AD1848_DOUBLE("PCM Playback Switch", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("PCM Playback Volume", 0, AD1848_LEFT_OUTPUT, AD1848_RIGHT_OUTPUT, 0, 0, 63, 1,
              db_scale_6bit),
AD1848_DOUBLE("Aux Playback Switch", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 0, AD1848_AUX1_LEFT_INPUT, AD1848_AUX1_RIGHT_INPUT, 0, 0, 31, 1,
              db_scale_5bit_12db_max),
AD1848_DOUBLE("Aux Playback Switch", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 7, 7, 1, 1),
AD1848_DOUBLE_TLV("Aux Playback Volume", 1, AD1848_AUX2_LEFT_INPUT, AD1848_AUX2_RIGHT_INPUT, 0, 0, 31, 1,
              db_scale_5bit_12db_max),
AD1848_DOUBLE_TLV("Capture Volume", 0, AD1848_LEFT_INPUT, AD1848_RIGHT_INPUT, 0, 0, 15, 0,
              db_scale_rec_gain),
{
      .name = "Capture Source",
      .type = AD1848_MIX_CAPTURE,
},
AD1848_SINGLE("Loopback Capture Switch", 0, AD1848_LOOPBACK, 0, 1, 0),
AD1848_SINGLE_TLV("Loopback Capture Volume", 0, AD1848_LOOPBACK, 1, 63, 0,
              db_scale_6bit),
};
                                        
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_mixer);

/*
 *  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)

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