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als300.c

/*
 *  als300.c - driver for Avance Logic ALS300/ALS300+ soundcards.
 *  Copyright (C) 2005 by Ash Willis <ashwillis@programmer.net>
 *
 *  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
 *
 *  TODO
 *  4 channel playback for ALS300+
 *  gameport
 *  mpu401
 *  opl3
 *
 *  NOTES
 *  The BLOCK_COUNTER registers for the ALS300(+) return a figure related to
 *  the position in the current period, NOT the whole buffer. It is important
 *  to know which period we are in so we can calculate the correct pointer.
 *  This is why we always use 2 periods. We can then use a flip-flop variable
 *  to keep track of what period we are in.
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/slab.h>

#include <asm/io.h>

#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include <sound/opl3.h>

/* snd_als300_set_irq_flag */
#define IRQ_DISABLE           0
#define IRQ_ENABLE            1

/* I/O port layout */
#define AC97_ACCESS           0x00
#define AC97_READ       0x04
#define AC97_STATUS           0x06
#define   AC97_DATA_AVAIL           (1<<6)
#define   AC97_BUSY                 (1<<7)
#define ALS300_IRQ_STATUS     0x07        /* ALS300 Only */
#define   IRQ_PLAYBACK              (1<<3)
#define   IRQ_CAPTURE               (1<<2)
#define GCR_DATA        0x08
#define GCR_INDEX       0x0C
#define ALS300P_DRAM_IRQ_STATUS     0x0D        /* ALS300+ Only */
#define MPU_IRQ_STATUS        0x0E        /* ALS300 Rev. E+, ALS300+ */
#define ALS300P_IRQ_STATUS    0x0F        /* ALS300+ Only */

/* General Control Registers */
#define PLAYBACK_START        0x80
#define PLAYBACK_END          0x81
#define PLAYBACK_CONTROL      0x82
#define   TRANSFER_START            (1<<16)
#define   FIFO_PAUSE                (1<<17)
#define RECORD_START          0x83
#define RECORD_END            0x84
#define RECORD_CONTROL        0x85
#define DRAM_WRITE_CONTROL    0x8B
#define   WRITE_TRANS_START         (1<<16)
#define   DRAM_MODE_2               (1<<17)
#define MISC_CONTROL          0x8C
#define   IRQ_SET_BIT               (1<<15)
#define   VMUTE_NORMAL              (1<<20)
#define   MMUTE_NORMAL              (1<<21)
#define MUS_VOC_VOL           0x8E
#define PLAYBACK_BLOCK_COUNTER      0x9A
#define RECORD_BLOCK_COUNTER  0x9B

#define DEBUG_CALLS     0
#define DEBUG_PLAY_REC  0

#if DEBUG_CALLS
#define snd_als300_dbgcalls(format, args...) printk(KERN_DEBUG format, ##args)
#define snd_als300_dbgcallenter() printk(KERN_ERR "--> %s\n", __func__)
#define snd_als300_dbgcallleave() printk(KERN_ERR "<-- %s\n", __func__)
#else
#define snd_als300_dbgcalls(format, args...)
#define snd_als300_dbgcallenter()
#define snd_als300_dbgcallleave()
#endif

#if DEBUG_PLAY_REC
#define snd_als300_dbgplay(format, args...) printk(KERN_ERR format, ##args)
#else
#define snd_als300_dbgplay(format, args...)
#endif            

enum {DEVICE_ALS300, DEVICE_ALS300_PLUS};

MODULE_AUTHOR("Ash Willis <ashwillis@programmer.net>");
MODULE_DESCRIPTION("Avance Logic ALS300");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Avance Logic,ALS300},{Avance Logic,ALS300+}}");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

struct snd_als300 {
      unsigned long port;
      spinlock_t reg_lock;
      struct snd_card *card;
      struct pci_dev *pci;

      struct snd_pcm *pcm;
      struct snd_pcm_substream *playback_substream;
      struct snd_pcm_substream *capture_substream;

      struct snd_ac97 *ac97;
      struct snd_opl3 *opl3;

      struct resource *res_port;

      int irq;

      int chip_type; /* ALS300 or ALS300+ */

      char revision;    
};

struct snd_als300_substream_data {
      int period_flipflop;
      int control_register;
      int block_counter_register;
};

static DEFINE_PCI_DEVICE_TABLE(snd_als300_ids) = {
      { 0x4005, 0x0300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, DEVICE_ALS300 },
      { 0x4005, 0x0308, PCI_ANY_ID, PCI_ANY_ID, 0, 0, DEVICE_ALS300_PLUS },
      { 0, }
};

MODULE_DEVICE_TABLE(pci, snd_als300_ids);

static inline u32 snd_als300_gcr_read(unsigned long port, unsigned short reg)
{
      outb(reg, port+GCR_INDEX);
      return inl(port+GCR_DATA);
}

static inline void snd_als300_gcr_write(unsigned long port,
                                    unsigned short reg, u32 val)
{
      outb(reg, port+GCR_INDEX);
      outl(val, port+GCR_DATA);
}

/* Enable/Disable Interrupts */
static void snd_als300_set_irq_flag(struct snd_als300 *chip, int cmd)
{
      u32 tmp = snd_als300_gcr_read(chip->port, MISC_CONTROL);
      snd_als300_dbgcallenter();

      /* boolean XOR check, since old vs. new hardware have
         directly reversed bit setting for ENABLE and DISABLE.
         ALS300+ acts like newer versions of ALS300 */
      if (((chip->revision > 5 || chip->chip_type == DEVICE_ALS300_PLUS) ^
                                    (cmd == IRQ_ENABLE)) == 0)
            tmp |= IRQ_SET_BIT;
      else
            tmp &= ~IRQ_SET_BIT;
      snd_als300_gcr_write(chip->port, MISC_CONTROL, tmp);
      snd_als300_dbgcallleave();
}

static int snd_als300_free(struct snd_als300 *chip)
{
      snd_als300_dbgcallenter();
      snd_als300_set_irq_flag(chip, IRQ_DISABLE);
      if (chip->irq >= 0)
            free_irq(chip->irq, chip);
      pci_release_regions(chip->pci);
      pci_disable_device(chip->pci);
      kfree(chip);
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_dev_free(struct snd_device *device)
{
      struct snd_als300 *chip = device->device_data;
      return snd_als300_free(chip);
}

static irqreturn_t snd_als300_interrupt(int irq, void *dev_id)
{
      u8 status;
      struct snd_als300 *chip = dev_id;
      struct snd_als300_substream_data *data;

      status = inb(chip->port+ALS300_IRQ_STATUS);
      if (!status) /* shared IRQ, for different device?? Exit ASAP! */
            return IRQ_NONE;

      /* ACK everything ASAP */
      outb(status, chip->port+ALS300_IRQ_STATUS);
      if (status & IRQ_PLAYBACK) {
            if (chip->pcm && chip->playback_substream) {
                  data = chip->playback_substream->runtime->private_data;
                  data->period_flipflop ^= 1;
                  snd_pcm_period_elapsed(chip->playback_substream);
                  snd_als300_dbgplay("IRQ_PLAYBACK\n");
            }
      }
      if (status & IRQ_CAPTURE) {
            if (chip->pcm && chip->capture_substream) {
                  data = chip->capture_substream->runtime->private_data;
                  data->period_flipflop ^= 1;
                  snd_pcm_period_elapsed(chip->capture_substream);
                  snd_als300_dbgplay("IRQ_CAPTURE\n");
            }
      }
      return IRQ_HANDLED;
}

static irqreturn_t snd_als300plus_interrupt(int irq, void *dev_id)
{
      u8 general, mpu, dram;
      struct snd_als300 *chip = dev_id;
      struct snd_als300_substream_data *data;
      
      general = inb(chip->port+ALS300P_IRQ_STATUS);
      mpu = inb(chip->port+MPU_IRQ_STATUS);
      dram = inb(chip->port+ALS300P_DRAM_IRQ_STATUS);

      /* shared IRQ, for different device?? Exit ASAP! */
      if ((general == 0) && ((mpu & 0x80) == 0) && ((dram & 0x01) == 0))
            return IRQ_NONE;

      if (general & IRQ_PLAYBACK) {
            if (chip->pcm && chip->playback_substream) {
                  outb(IRQ_PLAYBACK, chip->port+ALS300P_IRQ_STATUS);
                  data = chip->playback_substream->runtime->private_data;
                  data->period_flipflop ^= 1;
                  snd_pcm_period_elapsed(chip->playback_substream);
                  snd_als300_dbgplay("IRQ_PLAYBACK\n");
            }
      }
      if (general & IRQ_CAPTURE) {
            if (chip->pcm && chip->capture_substream) {
                  outb(IRQ_CAPTURE, chip->port+ALS300P_IRQ_STATUS);
                  data = chip->capture_substream->runtime->private_data;
                  data->period_flipflop ^= 1;
                  snd_pcm_period_elapsed(chip->capture_substream);
                  snd_als300_dbgplay("IRQ_CAPTURE\n");
            }
      }
      /* FIXME: Ack other interrupt types. Not important right now as
       * those other devices aren't enabled. */
      return IRQ_HANDLED;
}

static void __devexit snd_als300_remove(struct pci_dev *pci)
{
      snd_als300_dbgcallenter();
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
      snd_als300_dbgcallleave();
}

static unsigned short snd_als300_ac97_read(struct snd_ac97 *ac97,
                                          unsigned short reg)
{
      int i;
      struct snd_als300 *chip = ac97->private_data;

      for (i = 0; i < 1000; i++) {
            if ((inb(chip->port+AC97_STATUS) & (AC97_BUSY)) == 0)
                  break;
            udelay(10);
      }
      outl((reg << 24) | (1 << 31), chip->port+AC97_ACCESS);

      for (i = 0; i < 1000; i++) {
            if ((inb(chip->port+AC97_STATUS) & (AC97_DATA_AVAIL)) != 0)
                  break;
            udelay(10);
      }
      return inw(chip->port+AC97_READ);
}

static void snd_als300_ac97_write(struct snd_ac97 *ac97,
                        unsigned short reg, unsigned short val)
{
      int i;
      struct snd_als300 *chip = ac97->private_data;

      for (i = 0; i < 1000; i++) {
            if ((inb(chip->port+AC97_STATUS) & (AC97_BUSY)) == 0)
                  break;
            udelay(10);
      }
      outl((reg << 24) | val, chip->port+AC97_ACCESS);
}

static int snd_als300_ac97(struct snd_als300 *chip)
{
      struct snd_ac97_bus *bus;
      struct snd_ac97_template ac97;
      int err;
      static struct snd_ac97_bus_ops ops = {
            .write = snd_als300_ac97_write,
            .read = snd_als300_ac97_read,
      };

      snd_als300_dbgcallenter();
      if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus)) < 0)
            return err;

      memset(&ac97, 0, sizeof(ac97));
      ac97.private_data = chip;

      snd_als300_dbgcallleave();
      return snd_ac97_mixer(bus, &ac97, &chip->ac97);
}

/* hardware definition
 *
 * In AC97 mode, we always use 48k/16bit/stereo.
 * Any request to change data type is ignored by
 * the card when it is running outside of legacy
 * mode.
 */
static struct snd_pcm_hardware snd_als300_playback_hw =
{
      .info =                 (SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_PAUSE |
                        SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_S16,
      .rates =          SNDRV_PCM_RATE_48000,
      .rate_min =       48000,
      .rate_max =       48000,
      .channels_min =         2,
      .channels_max =         2,
      .buffer_bytes_max =     64 * 1024,
      .period_bytes_min =     64,
      .period_bytes_max =     32 * 1024,
      .periods_min =          2,
      .periods_max =          2,
};

static struct snd_pcm_hardware snd_als300_capture_hw =
{
      .info =                 (SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_PAUSE |
                        SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_S16,
      .rates =          SNDRV_PCM_RATE_48000,
      .rate_min =       48000,
      .rate_max =       48000,
      .channels_min =         2,
      .channels_max =         2,
      .buffer_bytes_max =     64 * 1024,
      .period_bytes_min =     64,
      .period_bytes_max =     32 * 1024,
      .periods_min =          2,
      .periods_max =          2,
};

static int snd_als300_playback_open(struct snd_pcm_substream *substream)
{
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_als300_substream_data *data = kzalloc(sizeof(*data),
                                                GFP_KERNEL);

      snd_als300_dbgcallenter();
      chip->playback_substream = substream;
      runtime->hw = snd_als300_playback_hw;
      runtime->private_data = data;
      data->control_register = PLAYBACK_CONTROL;
      data->block_counter_register = PLAYBACK_BLOCK_COUNTER;
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_playback_close(struct snd_pcm_substream *substream)
{
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_als300_substream_data *data;

      data = substream->runtime->private_data;
      snd_als300_dbgcallenter();
      kfree(data);
      chip->playback_substream = NULL;
      snd_pcm_lib_free_pages(substream);
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_capture_open(struct snd_pcm_substream *substream)
{
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      struct snd_als300_substream_data *data = kzalloc(sizeof(*data),
                                                GFP_KERNEL);

      snd_als300_dbgcallenter();
      chip->capture_substream = substream;
      runtime->hw = snd_als300_capture_hw;
      runtime->private_data = data;
      data->control_register = RECORD_CONTROL;
      data->block_counter_register = RECORD_BLOCK_COUNTER;
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_capture_close(struct snd_pcm_substream *substream)
{
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_als300_substream_data *data;

      data = substream->runtime->private_data;
      snd_als300_dbgcallenter();
      kfree(data);
      chip->capture_substream = NULL;
      snd_pcm_lib_free_pages(substream);
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_pcm_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_als300_pcm_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static int snd_als300_playback_prepare(struct snd_pcm_substream *substream)
{
      u32 tmp;
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned short period_bytes = snd_pcm_lib_period_bytes(substream);
      unsigned short buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
      
      snd_als300_dbgcallenter();
      spin_lock_irq(&chip->reg_lock);
      tmp = snd_als300_gcr_read(chip->port, PLAYBACK_CONTROL);
      tmp &= ~TRANSFER_START;

      snd_als300_dbgplay("Period bytes: %d Buffer bytes %d\n",
                                    period_bytes, buffer_bytes);
      
      /* set block size */
      tmp &= 0xffff0000;
      tmp |= period_bytes - 1;
      snd_als300_gcr_write(chip->port, PLAYBACK_CONTROL, tmp);

      /* set dma area */
      snd_als300_gcr_write(chip->port, PLAYBACK_START,
                              runtime->dma_addr);
      snd_als300_gcr_write(chip->port, PLAYBACK_END,
                              runtime->dma_addr + buffer_bytes - 1);
      spin_unlock_irq(&chip->reg_lock);
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_capture_prepare(struct snd_pcm_substream *substream)
{
      u32 tmp;
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned short period_bytes = snd_pcm_lib_period_bytes(substream);
      unsigned short buffer_bytes = snd_pcm_lib_buffer_bytes(substream);

      snd_als300_dbgcallenter();
      spin_lock_irq(&chip->reg_lock);
      tmp = snd_als300_gcr_read(chip->port, RECORD_CONTROL);
      tmp &= ~TRANSFER_START;

      snd_als300_dbgplay("Period bytes: %d Buffer bytes %d\n", period_bytes,
                                          buffer_bytes);

      /* set block size */
      tmp &= 0xffff0000;
      tmp |= period_bytes - 1;

      /* set dma area */
      snd_als300_gcr_write(chip->port, RECORD_CONTROL, tmp);
      snd_als300_gcr_write(chip->port, RECORD_START,
                              runtime->dma_addr);
      snd_als300_gcr_write(chip->port, RECORD_END,
                              runtime->dma_addr + buffer_bytes - 1);
      spin_unlock_irq(&chip->reg_lock);
      snd_als300_dbgcallleave();
      return 0;
}

static int snd_als300_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      u32 tmp;
      struct snd_als300_substream_data *data;
      unsigned short reg;
      int ret = 0;

      data = substream->runtime->private_data;
      reg = data->control_register;

      snd_als300_dbgcallenter();
      spin_lock(&chip->reg_lock);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            tmp = snd_als300_gcr_read(chip->port, reg);
            data->period_flipflop = 1;
            snd_als300_gcr_write(chip->port, reg, tmp | TRANSFER_START);
            snd_als300_dbgplay("TRIGGER START\n");
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            tmp = snd_als300_gcr_read(chip->port, reg);
            snd_als300_gcr_write(chip->port, reg, tmp & ~TRANSFER_START);
            snd_als300_dbgplay("TRIGGER STOP\n");
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            tmp = snd_als300_gcr_read(chip->port, reg);
            snd_als300_gcr_write(chip->port, reg, tmp | FIFO_PAUSE);
            snd_als300_dbgplay("TRIGGER PAUSE\n");
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            tmp = snd_als300_gcr_read(chip->port, reg);
            snd_als300_gcr_write(chip->port, reg, tmp & ~FIFO_PAUSE);
            snd_als300_dbgplay("TRIGGER RELEASE\n");
            break;
      default:
            snd_als300_dbgplay("TRIGGER INVALID\n");
            ret = -EINVAL;
      }
      spin_unlock(&chip->reg_lock);
      snd_als300_dbgcallleave();
      return ret;
}

static snd_pcm_uframes_t snd_als300_pointer(struct snd_pcm_substream *substream)
{
      u16 current_ptr;
      struct snd_als300 *chip = snd_pcm_substream_chip(substream);
      struct snd_als300_substream_data *data;
      unsigned short period_bytes;

      data = substream->runtime->private_data;
      period_bytes = snd_pcm_lib_period_bytes(substream);
      
      snd_als300_dbgcallenter();
      spin_lock(&chip->reg_lock);
      current_ptr = (u16) snd_als300_gcr_read(chip->port,
                              data->block_counter_register) + 4;
      spin_unlock(&chip->reg_lock);
      if (current_ptr > period_bytes)
            current_ptr = 0;
      else
            current_ptr = period_bytes - current_ptr;

      if (data->period_flipflop == 0)
            current_ptr += period_bytes;
      snd_als300_dbgplay("Pointer (bytes): %d\n", current_ptr);
      snd_als300_dbgcallleave();
      return bytes_to_frames(substream->runtime, current_ptr);
}

static struct snd_pcm_ops snd_als300_playback_ops = {
      .open =           snd_als300_playback_open,
      .close =    snd_als300_playback_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_als300_pcm_hw_params,
      .hw_free =  snd_als300_pcm_hw_free,
      .prepare =  snd_als300_playback_prepare,
      .trigger =  snd_als300_trigger,
      .pointer =  snd_als300_pointer,
};

static struct snd_pcm_ops snd_als300_capture_ops = {
      .open =           snd_als300_capture_open,
      .close =    snd_als300_capture_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_als300_pcm_hw_params,
      .hw_free =  snd_als300_pcm_hw_free,
      .prepare =  snd_als300_capture_prepare,
      .trigger =  snd_als300_trigger,
      .pointer =  snd_als300_pointer,
};

static int __devinit snd_als300_new_pcm(struct snd_als300 *chip)
{
      struct snd_pcm *pcm;
      int err;

      snd_als300_dbgcallenter();
      err = snd_pcm_new(chip->card, "ALS300", 0, 1, 1, &pcm);
      if (err < 0)
            return err;
      pcm->private_data = chip;
      strcpy(pcm->name, "ALS300");
      chip->pcm = pcm;

      /* set operators */
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                        &snd_als300_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
                        &snd_als300_capture_ops);

      /* pre-allocation of buffers */
      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
      snd_dma_pci_data(chip->pci), 64*1024, 64*1024);
      snd_als300_dbgcallleave();
      return 0;
}

static void snd_als300_init(struct snd_als300 *chip)
{
      unsigned long flags;
      u32 tmp;
      
      snd_als300_dbgcallenter();
      spin_lock_irqsave(&chip->reg_lock, flags);
      chip->revision = (snd_als300_gcr_read(chip->port, MISC_CONTROL) >> 16)
                                                & 0x0000000F;
      /* Setup DRAM */
      tmp = snd_als300_gcr_read(chip->port, DRAM_WRITE_CONTROL);
      snd_als300_gcr_write(chip->port, DRAM_WRITE_CONTROL,
                                    (tmp | DRAM_MODE_2)
                                    & ~WRITE_TRANS_START);

      /* Enable IRQ output */
      snd_als300_set_irq_flag(chip, IRQ_ENABLE);

      /* Unmute hardware devices so their outputs get routed to
       * the onboard mixer */
      tmp = snd_als300_gcr_read(chip->port, MISC_CONTROL);
      snd_als300_gcr_write(chip->port, MISC_CONTROL,
                  tmp | VMUTE_NORMAL | MMUTE_NORMAL);

      /* Reset volumes */
      snd_als300_gcr_write(chip->port, MUS_VOC_VOL, 0);

      /* Make sure playback transfer is stopped */
      tmp = snd_als300_gcr_read(chip->port, PLAYBACK_CONTROL);
      snd_als300_gcr_write(chip->port, PLAYBACK_CONTROL,
                  tmp & ~TRANSFER_START);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
      snd_als300_dbgcallleave();
}

static int __devinit snd_als300_create(struct snd_card *card,
                               struct pci_dev *pci, int chip_type,
                               struct snd_als300 **rchip)
{
      struct snd_als300 *chip;
      void *irq_handler;
      int err;

      static struct snd_device_ops ops = {
            .dev_free = snd_als300_dev_free,
      };
      *rchip = NULL;

      snd_als300_dbgcallenter();
      if ((err = pci_enable_device(pci)) < 0)
            return err;

      if (pci_set_dma_mask(pci, DMA_BIT_MASK(28)) < 0 ||
            pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(28)) < 0) {
            printk(KERN_ERR "error setting 28bit DMA mask\n");
            pci_disable_device(pci);
            return -ENXIO;
      }
      pci_set_master(pci);

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL) {
            pci_disable_device(pci);
            return -ENOMEM;
      }

      chip->card = card;
      chip->pci = pci;
      chip->irq = -1;
      chip->chip_type = chip_type;
      spin_lock_init(&chip->reg_lock);

      if ((err = pci_request_regions(pci, "ALS300")) < 0) {
            kfree(chip);
            pci_disable_device(pci);
            return err;
      }
      chip->port = pci_resource_start(pci, 0);

      if (chip->chip_type == DEVICE_ALS300_PLUS)
            irq_handler = snd_als300plus_interrupt;
      else
            irq_handler = snd_als300_interrupt;

      if (request_irq(pci->irq, irq_handler, IRQF_SHARED,
                  card->shortname, chip)) {
            snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
            snd_als300_free(chip);
            return -EBUSY;
      }
      chip->irq = pci->irq;


      snd_als300_init(chip);

      err = snd_als300_ac97(chip);
      if (err < 0) {
            snd_printk(KERN_WARNING "Could not create ac97\n");
            snd_als300_free(chip);
            return err;
      }

      if ((err = snd_als300_new_pcm(chip)) < 0) {
            snd_printk(KERN_WARNING "Could not create PCM\n");
            snd_als300_free(chip);
            return err;
      }

      if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
                                    chip, &ops)) < 0) {
            snd_als300_free(chip);
            return err;
      }

      snd_card_set_dev(card, &pci->dev);

      *rchip = chip;
      snd_als300_dbgcallleave();
      return 0;
}

#ifdef CONFIG_PM
static int snd_als300_suspend(struct pci_dev *pci, pm_message_t state)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct snd_als300 *chip = card->private_data;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
      snd_pcm_suspend_all(chip->pcm);
      snd_ac97_suspend(chip->ac97);

      pci_disable_device(pci);
      pci_save_state(pci);
      pci_set_power_state(pci, pci_choose_state(pci, state));
      return 0;
}

static int snd_als300_resume(struct pci_dev *pci)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct snd_als300 *chip = card->private_data;

      pci_set_power_state(pci, PCI_D0);
      pci_restore_state(pci);
      if (pci_enable_device(pci) < 0) {
            printk(KERN_ERR "als300: pci_enable_device failed, "
                   "disabling device\n");
            snd_card_disconnect(card);
            return -EIO;
      }
      pci_set_master(pci);

      snd_als300_init(chip);
      snd_ac97_resume(chip->ac97);

      snd_power_change_state(card, SNDRV_CTL_POWER_D0);
      return 0;
}
#endif

static int __devinit snd_als300_probe(struct pci_dev *pci,
                             const struct pci_device_id *pci_id)
{
      static int dev;
      struct snd_card *card;
      struct snd_als300 *chip;
      int err, chip_type;

      if (dev >= SNDRV_CARDS)
            return -ENODEV;
      if (!enable[dev]) {
            dev++;
            return -ENOENT;
      }

      err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);

      if (err < 0)
            return err;

      chip_type = pci_id->driver_data;

      if ((err = snd_als300_create(card, pci, chip_type, &chip)) < 0) {
            snd_card_free(card);
            return err;
      }
      card->private_data = chip;

      strcpy(card->driver, "ALS300");
      if (chip->chip_type == DEVICE_ALS300_PLUS)
            /* don't know much about ALS300+ yet
             * print revision number for now */
            sprintf(card->shortname, "ALS300+ (Rev. %d)", chip->revision);
      else
            sprintf(card->shortname, "ALS300 (Rev. %c)", 'A' +
                                          chip->revision - 1);
      sprintf(card->longname, "%s at 0x%lx irq %i",
                        card->shortname, chip->port, chip->irq);

      if ((err = snd_card_register(card)) < 0) {
            snd_card_free(card);
            return err;
      }
      pci_set_drvdata(pci, card);
      dev++;
      return 0;
}

static struct pci_driver driver = {
      .name = "ALS300",
      .id_table = snd_als300_ids,
      .probe = snd_als300_probe,
      .remove = __devexit_p(snd_als300_remove),
#ifdef CONFIG_PM
      .suspend = snd_als300_suspend,
      .resume = snd_als300_resume,
#endif
};

static int __init alsa_card_als300_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit alsa_card_als300_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(alsa_card_als300_init)
module_exit(alsa_card_als300_exit)

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