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es1688_lib.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *  Routines for control of ESS ES1688/688/488 chip
 *
 *
 *   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 <sound/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/es1688.h>
#include <sound/initval.h>

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

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("ESS ESx688 lowlevel module");
MODULE_LICENSE("GPL");

static int snd_es1688_dsp_command(struct snd_es1688 *chip, unsigned char val)
{
      int i;

      for (i = 10000; i; i--)
            if ((inb(ES1688P(chip, STATUS)) & 0x80) == 0) {
                  outb(val, ES1688P(chip, COMMAND));
                  return 1;
            }
#ifdef CONFIG_SND_DEBUG
      printk("snd_es1688_dsp_command: timeout (0x%x)\n", val);
#endif
      return 0;
}

static int snd_es1688_dsp_get_byte(struct snd_es1688 *chip)
{
      int i;

      for (i = 1000; i; i--)
            if (inb(ES1688P(chip, DATA_AVAIL)) & 0x80)
                  return inb(ES1688P(chip, READ));
      snd_printd("es1688 get byte failed: 0x%lx = 0x%x!!!\n", ES1688P(chip, DATA_AVAIL), inb(ES1688P(chip, DATA_AVAIL)));
      return -ENODEV;
}

static int snd_es1688_write(struct snd_es1688 *chip,
                      unsigned char reg, unsigned char data)
{
      if (!snd_es1688_dsp_command(chip, reg))
            return 0;
      return snd_es1688_dsp_command(chip, data);
}

static int snd_es1688_read(struct snd_es1688 *chip, unsigned char reg)
{
      /* Read a byte from an extended mode register of ES1688 */
      if (!snd_es1688_dsp_command(chip, 0xc0))
            return -1;
      if (!snd_es1688_dsp_command(chip, reg))
            return -1;
      return snd_es1688_dsp_get_byte(chip);
}

void snd_es1688_mixer_write(struct snd_es1688 *chip,
                      unsigned char reg, unsigned char data)
{
      outb(reg, ES1688P(chip, MIXER_ADDR));
      udelay(10);
      outb(data, ES1688P(chip, MIXER_DATA));
      udelay(10);
}

static unsigned char snd_es1688_mixer_read(struct snd_es1688 *chip, unsigned char reg)
{
      unsigned char result;

      outb(reg, ES1688P(chip, MIXER_ADDR));
      udelay(10);
      result = inb(ES1688P(chip, MIXER_DATA));
      udelay(10);
      return result;
}

static int snd_es1688_reset(struct snd_es1688 *chip)
{
      int i;

      outb(3, ES1688P(chip, RESET));            /* valid only for ESS chips, SB -> 1 */
      udelay(10);
      outb(0, ES1688P(chip, RESET));
      udelay(30);
      for (i = 0; i < 1000 && !(inb(ES1688P(chip, DATA_AVAIL)) & 0x80); i++);
      if (inb(ES1688P(chip, READ)) != 0xaa) {
            snd_printd("ess_reset at 0x%lx: failed!!!\n", chip->port);
            return -ENODEV;
      }
      snd_es1688_dsp_command(chip, 0xc6); /* enable extended mode */
      return 0;
}

static int snd_es1688_probe(struct snd_es1688 *chip)
{
      unsigned long flags;
      unsigned short major, minor, hw;
      int i;

      /*
       *  initialization sequence
       */

      spin_lock_irqsave(&chip->reg_lock, flags);      /* Some ESS1688 cards need this */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE2));  /* ENABLE2 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE2));  /* ENABLE2 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE2));  /* ENABLE2 */
      inb(ES1688P(chip, ENABLE1));  /* ENABLE1 */
      inb(ES1688P(chip, ENABLE0));  /* ENABLE0 */

      if (snd_es1688_reset(chip) < 0) {
            snd_printdd("ESS: [0x%lx] reset failed... 0x%x\n", chip->port, inb(ES1688P(chip, READ)));
            spin_unlock_irqrestore(&chip->reg_lock, flags);
            return -ENODEV;
      }
      snd_es1688_dsp_command(chip, 0xe7); /* return identification */

      for (i = 1000, major = minor = 0; i; i--) {
            if (inb(ES1688P(chip, DATA_AVAIL)) & 0x80) {
                  if (major == 0) {
                        major = inb(ES1688P(chip, READ));
                  } else {
                        minor = inb(ES1688P(chip, READ));
                  }
            }
      }

      spin_unlock_irqrestore(&chip->reg_lock, flags);

      snd_printdd("ESS: [0x%lx] found.. major = 0x%x, minor = 0x%x\n", chip->port, major, minor);

      chip->version = (major << 8) | minor;
      if (!chip->version)
            return -ENODEV;   /* probably SB */

      hw = ES1688_HW_AUTO;
      switch (chip->version & 0xfff0) {
      case 0x4880:
            snd_printk("[0x%lx] ESS: AudioDrive ES488 detected, but driver is in another place\n", chip->port);
            return -ENODEV;
      case 0x6880:
            hw = (chip->version & 0x0f) >= 8 ? ES1688_HW_1688 : ES1688_HW_688;
            break;
      default:
            snd_printk("[0x%lx] ESS: unknown AudioDrive chip with version 0x%x (Jazz16 soundcard?)\n", chip->port, chip->version);
            return -ENODEV;
      }

      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_write(chip, 0xb1, 0x10); /* disable IRQ */
      snd_es1688_write(chip, 0xb2, 0x00); /* disable DMA */
      spin_unlock_irqrestore(&chip->reg_lock, flags);

      /* enable joystick, but disable OPL3 */
      spin_lock_irqsave(&chip->mixer_lock, flags);
      snd_es1688_mixer_write(chip, 0x40, 0x01);
      spin_unlock_irqrestore(&chip->mixer_lock, flags);

      return 0;
}

static int snd_es1688_init(struct snd_es1688 * chip, int enable)
{
      static int irqs[16] = {-1, -1, 0, -1, -1, 1, -1, 2, -1, 0, 3, -1, -1, -1, -1, -1};
      unsigned long flags;
      int cfg, irq_bits, dma, dma_bits, tmp, tmp1;

      /* ok.. setup MPU-401 port and joystick and OPL3 */
      cfg = 0x01;       /* enable joystick, but disable OPL3 */
      if (enable && chip->mpu_port >= 0x300 && chip->mpu_irq > 0 && chip->hardware != ES1688_HW_688) {
            tmp = (chip->mpu_port & 0x0f0) >> 4;
            if (tmp <= 3) {
                  switch (chip->mpu_irq) {
                  case 9:
                        tmp1 = 4;
                        break;
                  case 5:
                        tmp1 = 5;
                        break;
                  case 7:
                        tmp1 = 6;
                        break;
                  case 10:
                        tmp1 = 7;
                        break;
                  default:
                        tmp1 = 0;
                  }
                  if (tmp1) {
                        cfg |= (tmp << 3) | (tmp1 << 5);
                  }
            }
      }
#if 0
      snd_printk("mpu cfg = 0x%x\n", cfg);
#endif
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_mixer_write(chip, 0x40, cfg);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      /* --- */
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_read(chip, 0xb1);
      snd_es1688_read(chip, 0xb2);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      if (enable) {
            cfg = 0xf0; /* enable only DMA counter interrupt */
            irq_bits = irqs[chip->irq & 0x0f];
            if (irq_bits < 0) {
                  snd_printk("[0x%lx] ESS: bad IRQ %d for ES1688 chip!!\n", chip->port, chip->irq);
#if 0
                  irq_bits = 0;
                  cfg = 0x10;
#endif
                  return -EINVAL;
            }
            spin_lock_irqsave(&chip->reg_lock, flags);
            snd_es1688_write(chip, 0xb1, cfg | (irq_bits << 2));
            spin_unlock_irqrestore(&chip->reg_lock, flags);
            cfg = 0xf0; /* extended mode DMA enable */
            dma = chip->dma8;
            if (dma > 3 || dma == 2) {
                  snd_printk("[0x%lx] ESS: bad DMA channel %d for ES1688 chip!!\n", chip->port, dma);
#if 0
                  dma_bits = 0;
                  cfg = 0x00; /* disable all DMA */
#endif
                  return -EINVAL;
            } else {
                  dma_bits = dma;
                  if (dma != 3)
                        dma_bits++;
            }
            spin_lock_irqsave(&chip->reg_lock, flags);
            snd_es1688_write(chip, 0xb2, cfg | (dma_bits << 2));
            spin_unlock_irqrestore(&chip->reg_lock, flags);
      } else {
            spin_lock_irqsave(&chip->reg_lock, flags);
            snd_es1688_write(chip, 0xb1, 0x10); /* disable IRQ */
            snd_es1688_write(chip, 0xb2, 0x00); /* disable DMA */
            spin_unlock_irqrestore(&chip->reg_lock, flags);
      }
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_read(chip, 0xb1);
      snd_es1688_read(chip, 0xb2);
      snd_es1688_reset(chip);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return 0;
}

/*

 */

static struct snd_ratnum clocks[2] = {
      {
            .num = 795444,
            .den_min = 1,
            .den_max = 128,
            .den_step = 1,
      },
      {
            .num = 397722,
            .den_min = 1,
            .den_max = 128,
            .den_step = 1,
      }
};

static struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks  = {
      .nrats = 2,
      .rats = clocks,
};

static void snd_es1688_set_rate(struct snd_es1688 *chip, struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned int bits, divider;

      if (runtime->rate_num == clocks[0].num)
            bits = 256 - runtime->rate_den;
      else
            bits = 128 - runtime->rate_den;
      /* set filter register */
      divider = 256 - 7160000*20/(8*82*runtime->rate);
      /* write result to hardware */
      snd_es1688_write(chip, 0xa1, bits);
      snd_es1688_write(chip, 0xa2, divider);
}

static int snd_es1688_ioctl(struct snd_pcm_substream *substream,
                      unsigned int cmd, void *arg)
{
      return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_es1688_trigger(struct snd_es1688 *chip, int cmd, unsigned char value)
{
      int val;

      if (cmd == SNDRV_PCM_TRIGGER_STOP) {
            value = 0x00;
      } else if (cmd != SNDRV_PCM_TRIGGER_START) {
            return -EINVAL;
      }
      spin_lock(&chip->reg_lock);
      chip->trigger_value = value;
      val = snd_es1688_read(chip, 0xb8);
      if ((val < 0) || (val & 0x0f) == value) {
            spin_unlock(&chip->reg_lock);
            return -EINVAL;   /* something is wrong */
      }
#if 0
      printk("trigger: val = 0x%x, value = 0x%x\n", val, value);
      printk("trigger: pointer = 0x%x\n", snd_dma_pointer(chip->dma8, chip->dma_size));
#endif
      snd_es1688_write(chip, 0xb8, (val & 0xf0) | value);
      spin_unlock(&chip->reg_lock);
      return 0;
}

static int snd_es1688_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_es1688_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static int snd_es1688_playback_prepare(struct snd_pcm_substream *substream)
{
      unsigned long flags;
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned int size = snd_pcm_lib_buffer_bytes(substream);
      unsigned int count = snd_pcm_lib_period_bytes(substream);

      chip->dma_size = size;
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_reset(chip);
      snd_es1688_set_rate(chip, substream);
      snd_es1688_write(chip, 0xb8, 4);    /* auto init DMA mode */
      snd_es1688_write(chip, 0xa8, (snd_es1688_read(chip, 0xa8) & ~0x03) | (3 - runtime->channels));
      snd_es1688_write(chip, 0xb9, 2);    /* demand mode (4 bytes/request) */
      if (runtime->channels == 1) {
            if (snd_pcm_format_width(runtime->format) == 8) {
                  /* 8. bit mono */
                  snd_es1688_write(chip, 0xb6, 0x80);
                  snd_es1688_write(chip, 0xb7, 0x51);
                  snd_es1688_write(chip, 0xb7, 0xd0);
            } else {
                  /* 16. bit mono */
                  snd_es1688_write(chip, 0xb6, 0x00);
                  snd_es1688_write(chip, 0xb7, 0x71);
                  snd_es1688_write(chip, 0xb7, 0xf4);
            }
      } else {
            if (snd_pcm_format_width(runtime->format) == 8) {
                  /* 8. bit stereo */
                  snd_es1688_write(chip, 0xb6, 0x80);
                  snd_es1688_write(chip, 0xb7, 0x51);
                  snd_es1688_write(chip, 0xb7, 0x98);
            } else {
                  /* 16. bit stereo */
                  snd_es1688_write(chip, 0xb6, 0x00);
                  snd_es1688_write(chip, 0xb7, 0x71);
                  snd_es1688_write(chip, 0xb7, 0xbc);
            }
      }
      snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
      snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
      snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKON);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      /* --- */
      count = -count;
      snd_dma_program(chip->dma8, runtime->dma_addr, size, DMA_MODE_WRITE | DMA_AUTOINIT);
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_write(chip, 0xa4, (unsigned char) count);
      snd_es1688_write(chip, 0xa5, (unsigned char) (count >> 8));
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return 0;
}

static int snd_es1688_playback_trigger(struct snd_pcm_substream *substream,
                               int cmd)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      return snd_es1688_trigger(chip, cmd, 0x05);
}

static int snd_es1688_capture_prepare(struct snd_pcm_substream *substream)
{
      unsigned long flags;
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned int size = snd_pcm_lib_buffer_bytes(substream);
      unsigned int count = snd_pcm_lib_period_bytes(substream);

      chip->dma_size = size;
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_reset(chip);
      snd_es1688_set_rate(chip, substream);
      snd_es1688_dsp_command(chip, ES1688_DSP_CMD_SPKOFF);
      snd_es1688_write(chip, 0xb8, 0x0e); /* auto init DMA mode */
      snd_es1688_write(chip, 0xa8, (snd_es1688_read(chip, 0xa8) & ~0x03) | (3 - runtime->channels));
      snd_es1688_write(chip, 0xb9, 2);    /* demand mode (4 bytes/request) */
      if (runtime->channels == 1) {
            if (snd_pcm_format_width(runtime->format) == 8) {
                  /* 8. bit mono */
                  snd_es1688_write(chip, 0xb7, 0x51);
                  snd_es1688_write(chip, 0xb7, 0xd0);
            } else {
                  /* 16. bit mono */
                  snd_es1688_write(chip, 0xb7, 0x71);
                  snd_es1688_write(chip, 0xb7, 0xf4);
            }
      } else {
            if (snd_pcm_format_width(runtime->format) == 8) {
                  /* 8. bit stereo */
                  snd_es1688_write(chip, 0xb7, 0x51);
                  snd_es1688_write(chip, 0xb7, 0x98);
            } else {
                  /* 16. bit stereo */
                  snd_es1688_write(chip, 0xb7, 0x71);
                  snd_es1688_write(chip, 0xb7, 0xbc);
            }
      }
      snd_es1688_write(chip, 0xb1, (snd_es1688_read(chip, 0xb1) & 0x0f) | 0x50);
      snd_es1688_write(chip, 0xb2, (snd_es1688_read(chip, 0xb2) & 0x0f) | 0x50);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      /* --- */
      count = -count;
      snd_dma_program(chip->dma8, runtime->dma_addr, size, DMA_MODE_READ | DMA_AUTOINIT);
      spin_lock_irqsave(&chip->reg_lock, flags);
      snd_es1688_write(chip, 0xa4, (unsigned char) count);
      snd_es1688_write(chip, 0xa5, (unsigned char) (count >> 8));
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return 0;
}

static int snd_es1688_capture_trigger(struct snd_pcm_substream *substream,
                              int cmd)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      return snd_es1688_trigger(chip, cmd, 0x0f);
}

static irqreturn_t snd_es1688_interrupt(int irq, void *dev_id)
{
      struct snd_es1688 *chip = dev_id;

      if (chip->trigger_value == 0x05)    /* ok.. playback is active */
            snd_pcm_period_elapsed(chip->playback_substream);
      if (chip->trigger_value == 0x0f)    /* ok.. capture is active */
            snd_pcm_period_elapsed(chip->capture_substream);

      inb(ES1688P(chip, DATA_AVAIL));     /* ack interrupt */
      return IRQ_HANDLED;
}

static snd_pcm_uframes_t snd_es1688_playback_pointer(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      size_t ptr;
      
      if (chip->trigger_value != 0x05)
            return 0;
      ptr = snd_dma_pointer(chip->dma8, chip->dma_size);
      return bytes_to_frames(substream->runtime, ptr);
}

static snd_pcm_uframes_t snd_es1688_capture_pointer(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      size_t ptr;
      
      if (chip->trigger_value != 0x0f)
            return 0;
      ptr = snd_dma_pointer(chip->dma8, chip->dma_size);
      return bytes_to_frames(substream->runtime, ptr);
}

/*

 */

static struct snd_pcm_hardware snd_es1688_playback =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
      .rates =          SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0,
};

static struct snd_pcm_hardware snd_es1688_capture =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
      .rates =          SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0,
};

/*

 */

static int snd_es1688_playback_open(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      if (chip->capture_substream != NULL)
            return -EAGAIN;
      chip->playback_substream = substream;
      runtime->hw = snd_es1688_playback;
      snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                              &hw_constraints_clocks);
      return 0;
}

static int snd_es1688_capture_open(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      if (chip->playback_substream != NULL)
            return -EAGAIN;
      chip->capture_substream = substream;
      runtime->hw = snd_es1688_capture;
      snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                              &hw_constraints_clocks);
      return 0;
}

static int snd_es1688_playback_close(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);

      chip->playback_substream = NULL;
      return 0;
}

static int snd_es1688_capture_close(struct snd_pcm_substream *substream)
{
      struct snd_es1688 *chip = snd_pcm_substream_chip(substream);

      chip->capture_substream = NULL;
      return 0;
}

static int snd_es1688_free(struct snd_es1688 *chip)
{
      if (chip->res_port) {
            snd_es1688_init(chip, 0);
            release_and_free_resource(chip->res_port);
      }
      if (chip->irq >= 0)
            free_irq(chip->irq, (void *) chip);
      if (chip->dma8 >= 0) {
            disable_dma(chip->dma8);
            free_dma(chip->dma8);
      }
      kfree(chip);
      return 0;
}

static int snd_es1688_dev_free(struct snd_device *device)
{
      struct snd_es1688 *chip = device->device_data;
      return snd_es1688_free(chip);
}

static const char *snd_es1688_chip_id(struct snd_es1688 *chip)
{
      static char tmp[16];
      sprintf(tmp, "ES%s688 rev %i", chip->hardware == ES1688_HW_688 ? "" : "1", chip->version & 0x0f);
      return tmp;
}

int snd_es1688_create(struct snd_card *card,
                  unsigned long port,
                  unsigned long mpu_port,
                  int irq,
                  int mpu_irq,
                  int dma8,
                  unsigned short hardware,
                  struct snd_es1688 **rchip)
{
      static struct snd_device_ops ops = {
            .dev_free = snd_es1688_dev_free,
      };
                                
      struct snd_es1688 *chip;
      int err;

      *rchip = NULL;
      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL)
            return -ENOMEM;
      chip->irq = -1;
      chip->dma8 = -1;
      
      if ((chip->res_port = request_region(port + 4, 12, "ES1688")) == NULL) {
            snd_printk(KERN_ERR "es1688: can't grab port 0x%lx\n", port + 4);
            snd_es1688_free(chip);
            return -EBUSY;
      }
      if (request_irq(irq, snd_es1688_interrupt, IRQF_DISABLED, "ES1688", (void *) chip)) {
            snd_printk(KERN_ERR "es1688: can't grab IRQ %d\n", irq);
            snd_es1688_free(chip);
            return -EBUSY;
      }
      chip->irq = irq;
      if (request_dma(dma8, "ES1688")) {
            snd_printk(KERN_ERR "es1688: can't grab DMA8 %d\n", dma8);
            snd_es1688_free(chip);
            return -EBUSY;
      }
      chip->dma8 = dma8;

      spin_lock_init(&chip->reg_lock);
      spin_lock_init(&chip->mixer_lock);
      chip->card = card;
      chip->port = port;
      mpu_port &= ~0x000f;
      if (mpu_port < 0x300 || mpu_port > 0x330)
            mpu_port = 0;
      chip->mpu_port = mpu_port;
      chip->mpu_irq = mpu_irq;
      chip->hardware = hardware;

      if ((err = snd_es1688_probe(chip)) < 0) {
            snd_es1688_free(chip);
            return err;
      }
      if ((err = snd_es1688_init(chip, 1)) < 0) {
            snd_es1688_free(chip);
            return err;
      }

      /* Register device */
      if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
            snd_es1688_free(chip);
            return err;
      }

      *rchip = chip;
      return 0;
}

static struct snd_pcm_ops snd_es1688_playback_ops = {
      .open =                 snd_es1688_playback_open,
      .close =          snd_es1688_playback_close,
      .ioctl =          snd_es1688_ioctl,
      .hw_params =            snd_es1688_hw_params,
      .hw_free =        snd_es1688_hw_free,
      .prepare =        snd_es1688_playback_prepare,
      .trigger =        snd_es1688_playback_trigger,
      .pointer =        snd_es1688_playback_pointer,
};

static struct snd_pcm_ops snd_es1688_capture_ops = {
      .open =                 snd_es1688_capture_open,
      .close =          snd_es1688_capture_close,
      .ioctl =          snd_es1688_ioctl,
      .hw_params =            snd_es1688_hw_params,
      .hw_free =        snd_es1688_hw_free,
      .prepare =        snd_es1688_capture_prepare,
      .trigger =        snd_es1688_capture_trigger,
      .pointer =        snd_es1688_capture_pointer,
};

int snd_es1688_pcm(struct snd_es1688 * chip, int device, struct snd_pcm ** rpcm)
{
      struct snd_pcm *pcm;
      int err;

      if ((err = snd_pcm_new(chip->card, "ESx688", device, 1, 1, &pcm)) < 0)
            return err;

      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_es1688_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_es1688_capture_ops);

      pcm->private_data = chip;
      pcm->info_flags = SNDRV_PCM_INFO_HALF_DUPLEX;
      sprintf(pcm->name, snd_es1688_chip_id(chip));
      chip->pcm = pcm;

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                    snd_dma_isa_data(),
                                    64*1024, 64*1024);

      if (rpcm)
            *rpcm = pcm;
      return 0;
}

/*
 *  MIXER part
 */

static int snd_es1688_info_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{
      static char *texts[9] = {
            "Mic", "Mic Master", "CD", "AOUT",
            "Mic1", "Mix", "Line", "Master"
      };

      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = 8;
      if (uinfo->value.enumerated.item > 7)
            uinfo->value.enumerated.item = 7;
      strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
      return 0;
}

static int snd_es1688_get_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.enumerated.item[0] = snd_es1688_mixer_read(chip, ES1688_REC_DEV) & 7;
      return 0;
}

static int snd_es1688_put_mux(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *chip = snd_kcontrol_chip(kcontrol);
      unsigned long flags;
      unsigned char oval, nval;
      int change;
      
      if (ucontrol->value.enumerated.item[0] > 8)
            return -EINVAL;
      spin_lock_irqsave(&chip->reg_lock, flags);
      oval = snd_es1688_mixer_read(chip, ES1688_REC_DEV);
      nval = (ucontrol->value.enumerated.item[0] & 7) | (oval & ~15);
      change = nval != oval;
      if (change)
            snd_es1688_mixer_write(chip, ES1688_REC_DEV, nval);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return change;
}

#define ES1688_SINGLE(xname, xindex, reg, shift, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_es1688_info_single, \
  .get = snd_es1688_get_single, .put = snd_es1688_put_single, \
  .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24) }

static int snd_es1688_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_es1688_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *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] = (snd_es1688_mixer_read(chip, 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_es1688_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *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 char oval, nval;
      
      nval = (ucontrol->value.integer.value[0] & mask);
      if (invert)
            nval = mask - nval;
      nval <<= shift;
      spin_lock_irqsave(&chip->reg_lock, flags);
      oval = snd_es1688_mixer_read(chip, reg);
      nval = (oval & ~(mask << shift)) | nval;
      change = nval != oval;
      if (change)
            snd_es1688_mixer_write(chip, reg, nval);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return change;
}

#define ES1688_DOUBLE(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  .info = snd_es1688_info_double, \
  .get = snd_es1688_get_double, .put = snd_es1688_put_double, \
  .private_value = left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22) }

static int snd_es1688_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_es1688_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *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;
      unsigned char left, right;
      
      spin_lock_irqsave(&chip->reg_lock, flags);
      if (left_reg < 0xa0)
            left = snd_es1688_mixer_read(chip, left_reg);
      else
            left = snd_es1688_read(chip, left_reg);
      if (left_reg != right_reg) {
            if (right_reg < 0xa0) 
                  right = snd_es1688_mixer_read(chip, right_reg);
            else
                  right = snd_es1688_read(chip, right_reg);
      } else
            right = left;
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      ucontrol->value.integer.value[0] = (left >> shift_left) & mask;
      ucontrol->value.integer.value[1] = (right >> shift_right) & mask;
      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_es1688_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{
      struct snd_es1688 *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 char val1, val2, oval1, oval2;
      
      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) {
            if (left_reg < 0xa0)
                  oval1 = snd_es1688_mixer_read(chip, left_reg);
            else
                  oval1 = snd_es1688_read(chip, left_reg);
            if (right_reg < 0xa0)
                  oval2 = snd_es1688_mixer_read(chip, right_reg);
            else
                  oval2 = snd_es1688_read(chip, right_reg);
            val1 = (oval1 & ~(mask << shift_left)) | val1;
            val2 = (oval2 & ~(mask << shift_right)) | val2;
            change = val1 != oval1 || val2 != oval2;
            if (change) {
                  if (left_reg < 0xa0)
                        snd_es1688_mixer_write(chip, left_reg, val1);
                  else
                        snd_es1688_write(chip, left_reg, val1);
                  if (right_reg < 0xa0)
                        snd_es1688_mixer_write(chip, right_reg, val1);
                  else
                        snd_es1688_write(chip, right_reg, val1);
            }
      } else {
            if (left_reg < 0xa0)
                  oval1 = snd_es1688_mixer_read(chip, left_reg);
            else
                  oval1 = snd_es1688_read(chip, left_reg);
            val1 = (oval1 & ~((mask << shift_left) | (mask << shift_right))) | val1 | val2;
            change = val1 != oval1;
            if (change) {
                  if (left_reg < 0xa0)
                        snd_es1688_mixer_write(chip, left_reg, val1);
                  else
                        snd_es1688_write(chip, left_reg, val1);
            }
                  
      }
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      return change;
}

static struct snd_kcontrol_new snd_es1688_controls[] = {
ES1688_DOUBLE("Master Playback Volume", 0, ES1688_MASTER_DEV, ES1688_MASTER_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("PCM Playback Volume", 0, ES1688_PCM_DEV, ES1688_PCM_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Line Playback Volume", 0, ES1688_LINE_DEV, ES1688_LINE_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("CD Playback Volume", 0, ES1688_CD_DEV, ES1688_CD_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("FM Playback Volume", 0, ES1688_FM_DEV, ES1688_FM_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Mic Playback Volume", 0, ES1688_MIC_DEV, ES1688_MIC_DEV, 4, 0, 15, 0),
ES1688_DOUBLE("Aux Playback Volume", 0, ES1688_AUX_DEV, ES1688_AUX_DEV, 4, 0, 15, 0),
ES1688_SINGLE("PC Speaker Playback Volume", 0, ES1688_SPEAKER_DEV, 0, 7, 0),
ES1688_DOUBLE("Capture Volume", 0, ES1688_RECLEV_DEV, ES1688_RECLEV_DEV, 4, 0, 15, 0),
ES1688_SINGLE("Capture Switch", 0, ES1688_REC_DEV, 4, 1, 1),
{
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Capture Source",
      .info = snd_es1688_info_mux,
      .get = snd_es1688_get_mux,
      .put = snd_es1688_put_mux,
},
};

#define ES1688_INIT_TABLE_SIZE (sizeof(snd_es1688_init_table)/2)

static unsigned char snd_es1688_init_table[][2] = {
      { ES1688_MASTER_DEV, 0 },
      { ES1688_PCM_DEV, 0 },
      { ES1688_LINE_DEV, 0 },
      { ES1688_CD_DEV, 0 },
      { ES1688_FM_DEV, 0 },
      { ES1688_MIC_DEV, 0 },
      { ES1688_AUX_DEV, 0 },
      { ES1688_SPEAKER_DEV, 0 },
      { ES1688_RECLEV_DEV, 0 },
      { ES1688_REC_DEV, 0x17 }
};
                                        
int snd_es1688_mixer(struct snd_es1688 *chip)
{
      struct snd_card *card;
      unsigned int idx;
      int err;
      unsigned char reg, val;

      snd_assert(chip != NULL && chip->card != NULL, return -EINVAL);

      card = chip->card;

      strcpy(card->mixername, snd_es1688_chip_id(chip));

      for (idx = 0; idx < ARRAY_SIZE(snd_es1688_controls); idx++) {
            if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_es1688_controls[idx], chip))) < 0)
                  return err;
      }
      for (idx = 0; idx < ES1688_INIT_TABLE_SIZE; idx++) {
            reg = snd_es1688_init_table[idx][0];
            val = snd_es1688_init_table[idx][1];
            if (reg < 0xa0)
                  snd_es1688_mixer_write(chip, reg, val);
            else
                  snd_es1688_write(chip, reg, val);
      }
      return 0;
}

EXPORT_SYMBOL(snd_es1688_mixer_write);
EXPORT_SYMBOL(snd_es1688_create);
EXPORT_SYMBOL(snd_es1688_pcm);
EXPORT_SYMBOL(snd_es1688_mixer);

/*
 *  INIT part
 */

static int __init alsa_es1688_init(void)
{
      return 0;
}

static void __exit alsa_es1688_exit(void)
{
}

module_init(alsa_es1688_init)
module_exit(alsa_es1688_exit)

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