als300.c

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/*
 *  als300.c - driver for Avance Logic ALS300/ALS300+ soundcards.
 *  Copyright (C) 2005 by Ash Willis <[email protected]>
 *
 *  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/module.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 <[email protected]>");
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 bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for ALS300 sound card.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for ALS300 sound card.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable ALS300 sound card.");

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);

    if (!data)
        return -ENOMEM;
    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);

    if (!data)
        return -ENOMEM;
    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,
            KBUILD_MODNAME, 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_SLEEP
static int snd_als300_suspend(struct device *dev)
{
    struct pci_dev *pci = to_pci_dev(dev);
    struct snd_card *card = dev_get_drvdata(dev);
    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_D3hot);
    return 0;
}

static int snd_als300_resume(struct device *dev)
{
    struct pci_dev *pci = to_pci_dev(dev);
    struct snd_card *card = dev_get_drvdata(dev);
    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;
}

static SIMPLE_DEV_PM_OPS(snd_als300_pm, snd_als300_suspend, snd_als300_resume);
#define SND_ALS300_PM_OPS   &snd_als300_pm
#else
#define SND_ALS300_PM_OPS   NULL
#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 als300_driver = {
    .name = KBUILD_MODNAME,
    .id_table = snd_als300_ids,
    .probe = snd_als300_probe,
    .remove = __devexit_p(snd_als300_remove),
    .driver = {
        .pm = SND_ALS300_PM_OPS,
    },
};

module_pci_driver(als300_driver);