vx_core.c

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/*
 * Driver for Digigram VX soundcards
 *
 * Hardware core part
 *
 * Copyright (c) 2002 by Takashi Iwai <[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
 */

#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/asoundef.h>
#include <sound/info.h>
#include <asm/io.h>
#include <sound/vx_core.h>
#include "vx_cmd.h"

MODULE_AUTHOR("Takashi Iwai <[email protected]>");
MODULE_DESCRIPTION("Common routines for Digigram VX drivers");
MODULE_LICENSE("GPL");


/*
 * vx_check_reg_bit - wait for the specified bit is set/reset on a register
 * @reg: register to check
 * @mask: bit mask
 * @bit: resultant bit to be checked
 * @time: time-out of loop in msec
 *
 * returns zero if a bit matches, or a negative error code.
 */
int snd_vx_check_reg_bit(struct vx_core *chip, int reg, int mask, int bit, int time)
{
    unsigned long end_time = jiffies + (time * HZ + 999) / 1000;
#ifdef CONFIG_SND_DEBUG
    static char *reg_names[VX_REG_MAX] = {
        "ICR", "CVR", "ISR", "IVR", "RXH", "RXM", "RXL",
        "DMA", "CDSP", "RFREQ", "RUER/V2", "DATA", "MEMIRQ",
        "ACQ", "BIT0", "BIT1", "MIC0", "MIC1", "MIC2",
        "MIC3", "INTCSR", "CNTRL", "GPIOC",
        "LOFREQ", "HIFREQ", "CSUER", "RUER"
    };
#endif
    do {
        if ((snd_vx_inb(chip, reg) & mask) == bit)
            return 0;
        //msleep(10);
    } while (time_after_eq(end_time, jiffies));
    snd_printd(KERN_DEBUG "vx_check_reg_bit: timeout, reg=%s, mask=0x%x, val=0x%x\n", reg_names[reg], mask, snd_vx_inb(chip, reg));
    return -EIO;
}

EXPORT_SYMBOL(snd_vx_check_reg_bit);

/*
 * vx_send_irq_dsp - set command irq bit
 * @num: the requested IRQ type, IRQ_XXX
 *
 * this triggers the specified IRQ request
 * returns 0 if successful, or a negative error code.
 * 
 */
static int vx_send_irq_dsp(struct vx_core *chip, int num)
{
    int nirq;

    /* wait for Hc = 0 */
    if (snd_vx_check_reg_bit(chip, VX_CVR, CVR_HC, 0, 200) < 0)
        return -EIO;

    nirq = num;
    if (vx_has_new_dsp(chip))
        nirq += VXP_IRQ_OFFSET;
    vx_outb(chip, CVR, (nirq >> 1) | CVR_HC);
    return 0;
}


/*
 * vx_reset_chk - reset CHK bit on ISR
 *
 * returns 0 if successful, or a negative error code.
 */
static int vx_reset_chk(struct vx_core *chip)
{
    /* Reset irq CHK */
    if (vx_send_irq_dsp(chip, IRQ_RESET_CHK) < 0)
        return -EIO;
    /* Wait until CHK = 0 */
    if (vx_check_isr(chip, ISR_CHK, 0, 200) < 0)
        return -EIO;
    return 0;
}

/*
 * vx_transfer_end - terminate message transfer
 * @cmd: IRQ message to send (IRQ_MESS_XXX_END)
 *
 * returns 0 if successful, or a negative error code.
 * the error code can be VX-specific, retrieved via vx_get_error().
 * NB: call with spinlock held!
 */
static int vx_transfer_end(struct vx_core *chip, int cmd)
{
    int err;

    if ((err = vx_reset_chk(chip)) < 0)
        return err;

    /* irq MESS_READ/WRITE_END */
    if ((err = vx_send_irq_dsp(chip, cmd)) < 0)
        return err;

    /* Wait CHK = 1 */
    if ((err = vx_wait_isr_bit(chip, ISR_CHK)) < 0)
        return err;

    /* If error, Read RX */
    if ((err = vx_inb(chip, ISR)) & ISR_ERR) {
        if ((err = vx_wait_for_rx_full(chip)) < 0) {
            snd_printd(KERN_DEBUG "transfer_end: error in rx_full\n");
            return err;
        }
        err = vx_inb(chip, RXH) << 16;
        err |= vx_inb(chip, RXM) << 8;
        err |= vx_inb(chip, RXL);
        snd_printd(KERN_DEBUG "transfer_end: error = 0x%x\n", err);
        return -(VX_ERR_MASK | err);
    }
    return 0;
}

/*
 * vx_read_status - return the status rmh
 * @rmh: rmh record to store the status
 *
 * returns 0 if successful, or a negative error code.
 * the error code can be VX-specific, retrieved via vx_get_error().
 * NB: call with spinlock held!
 */
static int vx_read_status(struct vx_core *chip, struct vx_rmh *rmh)
{
    int i, err, val, size;

    /* no read necessary? */
    if (rmh->DspStat == RMH_SSIZE_FIXED && rmh->LgStat == 0)
        return 0;

    /* Wait for RX full (with timeout protection)
     * The first word of status is in RX
     */
    err = vx_wait_for_rx_full(chip);
    if (err < 0)
        return err;

    /* Read RX */
    val = vx_inb(chip, RXH) << 16;
    val |= vx_inb(chip, RXM) << 8;
    val |= vx_inb(chip, RXL);

    /* If status given by DSP, let's decode its size */
    switch (rmh->DspStat) {
    case RMH_SSIZE_ARG:
        size = val & 0xff;
        rmh->Stat[0] = val & 0xffff00;
        rmh->LgStat = size + 1;
        break;
    case RMH_SSIZE_MASK:
        /* Let's count the arg numbers from a mask */
        rmh->Stat[0] = val;
        size = 0;
        while (val) {
            if (val & 0x01)
                size++;
            val >>= 1;
        }
        rmh->LgStat = size + 1;
        break;
    default:
        /* else retrieve the status length given by the driver */
        size = rmh->LgStat;
        rmh->Stat[0] = val;  /* Val is the status 1st word */
        size--;              /* hence adjust remaining length */
        break;
        }

    if (size < 1)
        return 0;
    if (snd_BUG_ON(size > SIZE_MAX_STATUS))
        return -EINVAL;

    for (i = 1; i <= size; i++) {
        /* trigger an irq MESS_WRITE_NEXT */
        err = vx_send_irq_dsp(chip, IRQ_MESS_WRITE_NEXT);
        if (err < 0)
            return err;
        /* Wait for RX full (with timeout protection) */
        err = vx_wait_for_rx_full(chip);
        if (err < 0)
            return err;
        rmh->Stat[i] = vx_inb(chip, RXH) << 16;
        rmh->Stat[i] |= vx_inb(chip, RXM) <<  8;
        rmh->Stat[i] |= vx_inb(chip, RXL);
    }

    return vx_transfer_end(chip, IRQ_MESS_WRITE_END);
}


#define MASK_MORE_THAN_1_WORD_COMMAND   0x00008000
#define MASK_1_WORD_COMMAND             0x00ff7fff

/*
 * vx_send_msg_nolock - send a DSP message and read back the status
 * @rmh: the rmh record to send and receive
 *
 * returns 0 if successful, or a negative error code.
 * the error code can be VX-specific, retrieved via vx_get_error().
 * 
 * this function doesn't call spinlock at all.
 */
int vx_send_msg_nolock(struct vx_core *chip, struct vx_rmh *rmh)
{
    int i, err;
    
    if (chip->chip_status & VX_STAT_IS_STALE)
        return -EBUSY;

    if ((err = vx_reset_chk(chip)) < 0) {
        snd_printd(KERN_DEBUG "vx_send_msg: vx_reset_chk error\n");
        return err;
    }

#if 0
    printk(KERN_DEBUG "rmh: cmd = 0x%06x, length = %d, stype = %d\n",
           rmh->Cmd[0], rmh->LgCmd, rmh->DspStat);
    if (rmh->LgCmd > 1) {
        printk(KERN_DEBUG "  ");
        for (i = 1; i < rmh->LgCmd; i++)
            printk("0x%06x ", rmh->Cmd[i]);
        printk("\n");
    }
#endif
    /* Check bit M is set according to length of the command */
    if (rmh->LgCmd > 1)
        rmh->Cmd[0] |= MASK_MORE_THAN_1_WORD_COMMAND;
    else
        rmh->Cmd[0] &= MASK_1_WORD_COMMAND;

    /* Wait for TX empty */
    if ((err = vx_wait_isr_bit(chip, ISR_TX_EMPTY)) < 0) {
        snd_printd(KERN_DEBUG "vx_send_msg: wait tx empty error\n");
        return err;
    }

    /* Write Cmd[0] */
    vx_outb(chip, TXH, (rmh->Cmd[0] >> 16) & 0xff);
    vx_outb(chip, TXM, (rmh->Cmd[0] >> 8) & 0xff);
    vx_outb(chip, TXL, rmh->Cmd[0] & 0xff);

    /* Trigger irq MESSAGE */
    if ((err = vx_send_irq_dsp(chip, IRQ_MESSAGE)) < 0) {
        snd_printd(KERN_DEBUG "vx_send_msg: send IRQ_MESSAGE error\n");
        return err;
    }

    /* Wait for CHK = 1 */
    if ((err = vx_wait_isr_bit(chip, ISR_CHK)) < 0)
        return err;

    /* If error, get error value from RX */
    if (vx_inb(chip, ISR) & ISR_ERR) {
        if ((err = vx_wait_for_rx_full(chip)) < 0) {
            snd_printd(KERN_DEBUG "vx_send_msg: rx_full read error\n");
            return err;
        }
        err = vx_inb(chip, RXH) << 16;
        err |= vx_inb(chip, RXM) << 8;
        err |= vx_inb(chip, RXL);
        snd_printd(KERN_DEBUG "msg got error = 0x%x at cmd[0]\n", err);
        err = -(VX_ERR_MASK | err);
        return err;
    }

    /* Send the other words */
    if (rmh->LgCmd > 1) {
        for (i = 1; i < rmh->LgCmd; i++) {
            /* Wait for TX ready */
            if ((err = vx_wait_isr_bit(chip, ISR_TX_READY)) < 0) {
                snd_printd(KERN_DEBUG "vx_send_msg: tx_ready error\n");
                return err;
            }

            /* Write Cmd[i] */
            vx_outb(chip, TXH, (rmh->Cmd[i] >> 16) & 0xff);
            vx_outb(chip, TXM, (rmh->Cmd[i] >> 8) & 0xff);
            vx_outb(chip, TXL, rmh->Cmd[i] & 0xff);

            /* Trigger irq MESS_READ_NEXT */
            if ((err = vx_send_irq_dsp(chip, IRQ_MESS_READ_NEXT)) < 0) {
                snd_printd(KERN_DEBUG "vx_send_msg: IRQ_READ_NEXT error\n");
                return err;
            }
        }
        /* Wait for TX empty */
        if ((err = vx_wait_isr_bit(chip, ISR_TX_READY)) < 0) {
            snd_printd(KERN_DEBUG "vx_send_msg: TX_READY error\n");
            return err;
        }
        /* End of transfer */
        err = vx_transfer_end(chip, IRQ_MESS_READ_END);
        if (err < 0)
            return err;
    }

    return vx_read_status(chip, rmh);
}


/*
 * vx_send_msg - send a DSP message with spinlock
 * @rmh: the rmh record to send and receive
 *
 * returns 0 if successful, or a negative error code.
 * see vx_send_msg_nolock().
 */
int vx_send_msg(struct vx_core *chip, struct vx_rmh *rmh)
{
    unsigned long flags;
    int err;

    spin_lock_irqsave(&chip->lock, flags);
    err = vx_send_msg_nolock(chip, rmh);
    spin_unlock_irqrestore(&chip->lock, flags);
    return err;
}


/*
 * vx_send_rih_nolock - send an RIH to xilinx
 * @cmd: the command to send
 *
 * returns 0 if successful, or a negative error code.
 * the error code can be VX-specific, retrieved via vx_get_error().
 *
 * this function doesn't call spinlock at all.
 *
 * unlike RMH, no command is sent to DSP.
 */
int vx_send_rih_nolock(struct vx_core *chip, int cmd)
{
    int err;

    if (chip->chip_status & VX_STAT_IS_STALE)
        return -EBUSY;

#if 0
    printk(KERN_DEBUG "send_rih: cmd = 0x%x\n", cmd);
#endif
    if ((err = vx_reset_chk(chip)) < 0)
        return err;
    /* send the IRQ */
    if ((err = vx_send_irq_dsp(chip, cmd)) < 0)
        return err;
    /* Wait CHK = 1 */
    if ((err = vx_wait_isr_bit(chip, ISR_CHK)) < 0)
        return err;
    /* If error, read RX */
    if (vx_inb(chip, ISR) & ISR_ERR) {
        if ((err = vx_wait_for_rx_full(chip)) < 0)
            return err;
        err = vx_inb(chip, RXH) << 16;
        err |= vx_inb(chip, RXM) << 8;
        err |= vx_inb(chip, RXL);
        return -(VX_ERR_MASK | err);
    }
    return 0;
}


/*
 * vx_send_rih - send an RIH with spinlock
 * @cmd: the command to send
 *
 * see vx_send_rih_nolock().
 */
int vx_send_rih(struct vx_core *chip, int cmd)
{
    unsigned long flags;
    int err;

    spin_lock_irqsave(&chip->lock, flags);
    err = vx_send_rih_nolock(chip, cmd);
    spin_unlock_irqrestore(&chip->lock, flags);
    return err;
}

#define END_OF_RESET_WAIT_TIME      500 /* us */

int snd_vx_load_boot_image(struct vx_core *chip, const struct firmware *boot)
{
    unsigned int i;
    int no_fillup = vx_has_new_dsp(chip);

    /* check the length of boot image */
    if (boot->size <= 0)
        return -EINVAL;
    if (boot->size % 3)
        return -EINVAL;
#if 0
    {
        /* more strict check */
        unsigned int c = ((u32)boot->data[0] << 16) | ((u32)boot->data[1] << 8) | boot->data[2];
        if (boot->size != (c + 2) * 3)
            return -EINVAL;
    }
#endif

    /* reset dsp */
    vx_reset_dsp(chip);
    
    udelay(END_OF_RESET_WAIT_TIME); /* another wait? */

    /* download boot strap */
    for (i = 0; i < 0x600; i += 3) {
        if (i >= boot->size) {
            if (no_fillup)
                break;
            if (vx_wait_isr_bit(chip, ISR_TX_EMPTY) < 0) {
                snd_printk(KERN_ERR "dsp boot failed at %d\n", i);
                return -EIO;
            }
            vx_outb(chip, TXH, 0);
            vx_outb(chip, TXM, 0);
            vx_outb(chip, TXL, 0);
        } else {
            const unsigned char *image = boot->data + i;
            if (vx_wait_isr_bit(chip, ISR_TX_EMPTY) < 0) {
                snd_printk(KERN_ERR "dsp boot failed at %d\n", i);
                return -EIO;
            }
            vx_outb(chip, TXH, image[0]);
            vx_outb(chip, TXM, image[1]);
            vx_outb(chip, TXL, image[2]);
        }
    }
    return 0;
}

EXPORT_SYMBOL(snd_vx_load_boot_image);

/*
 * vx_test_irq_src - query the source of interrupts
 *
 * called from irq handler only
 */
static int vx_test_irq_src(struct vx_core *chip, unsigned int *ret)
{
    int err;

    vx_init_rmh(&chip->irq_rmh, CMD_TEST_IT);
    spin_lock(&chip->lock);
    err = vx_send_msg_nolock(chip, &chip->irq_rmh);
    if (err < 0)
        *ret = 0;
    else
        *ret = chip->irq_rmh.Stat[0];
    spin_unlock(&chip->lock);
    return err;
}


/*
 * vx_interrupt - soft irq handler
 */
static void vx_interrupt(unsigned long private_data)
{
    struct vx_core *chip = (struct vx_core *) private_data;
    unsigned int events;
        
    if (chip->chip_status & VX_STAT_IS_STALE)
        return;

    if (vx_test_irq_src(chip, &events) < 0)
        return;
    
#if 0
    if (events & 0x000800)
        printk(KERN_ERR "DSP Stream underrun ! IRQ events = 0x%x\n", events);
#endif
    // printk(KERN_DEBUG "IRQ events = 0x%x\n", events);

    /* We must prevent any application using this DSP
     * and block any further request until the application
     * either unregisters or reloads the DSP
     */
    if (events & FATAL_DSP_ERROR) {
        snd_printk(KERN_ERR "vx_core: fatal DSP error!!\n");
        return;
    }

    /* The start on time code conditions are filled (ie the time code
     * received by the board is equal to one of those given to it).
     */
    if (events & TIME_CODE_EVENT_PENDING)
        ; /* so far, nothing to do yet */

    /* The frequency has changed on the board (UER mode). */
    if (events & FREQUENCY_CHANGE_EVENT_PENDING)
        vx_change_frequency(chip);

    /* update the pcm streams */
    vx_pcm_update_intr(chip, events);
}


irqreturn_t snd_vx_irq_handler(int irq, void *dev)
{
    struct vx_core *chip = dev;

    if (! (chip->chip_status & VX_STAT_CHIP_INIT) ||
        (chip->chip_status & VX_STAT_IS_STALE))
        return IRQ_NONE;
    if (! vx_test_and_ack(chip))
        tasklet_schedule(&chip->tq);
    return IRQ_HANDLED;
}

EXPORT_SYMBOL(snd_vx_irq_handler);

/*
 */
static void vx_reset_board(struct vx_core *chip, int cold_reset)
{
    if (snd_BUG_ON(!chip->ops->reset_board))
        return;

    /* current source, later sync'ed with target */
    chip->audio_source = VX_AUDIO_SRC_LINE;
    if (cold_reset) {
        chip->audio_source_target = chip->audio_source;
        chip->clock_source = INTERNAL_QUARTZ;
        chip->clock_mode = VX_CLOCK_MODE_AUTO;
        chip->freq = 48000;
        chip->uer_detected = VX_UER_MODE_NOT_PRESENT;
        chip->uer_bits = SNDRV_PCM_DEFAULT_CON_SPDIF;
    }

    chip->ops->reset_board(chip, cold_reset);

    vx_reset_codec(chip, cold_reset);

    vx_set_internal_clock(chip, chip->freq);

    /* Reset the DSP */
    vx_reset_dsp(chip);

    if (vx_is_pcmcia(chip)) {
        /* Acknowledge any pending IRQ and reset the MEMIRQ flag. */
        vx_test_and_ack(chip);
        vx_validate_irq(chip, 1);
    }

    /* init CBits */
    vx_set_iec958_status(chip, chip->uer_bits);
}


/*
 * proc interface
 */

static void vx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
    struct vx_core *chip = entry->private_data;
    static char *audio_src_vxp[] = { "Line", "Mic", "Digital" };
    static char *audio_src_vx2[] = { "Analog", "Analog", "Digital" };
    static char *clock_mode[] = { "Auto", "Internal", "External" };
    static char *clock_src[] = { "Internal", "External" };
    static char *uer_type[] = { "Consumer", "Professional", "Not Present" };
    
    snd_iprintf(buffer, "%s\n", chip->card->longname);
    snd_iprintf(buffer, "Xilinx Firmware: %s\n",
            chip->chip_status & VX_STAT_XILINX_LOADED ? "Loaded" : "No");
    snd_iprintf(buffer, "Device Initialized: %s\n",
            chip->chip_status & VX_STAT_DEVICE_INIT ? "Yes" : "No");
    snd_iprintf(buffer, "DSP audio info:");
    if (chip->audio_info & VX_AUDIO_INFO_REAL_TIME)
        snd_iprintf(buffer, " realtime");
    if (chip->audio_info & VX_AUDIO_INFO_OFFLINE)
        snd_iprintf(buffer, " offline");
    if (chip->audio_info & VX_AUDIO_INFO_MPEG1)
        snd_iprintf(buffer, " mpeg1");
    if (chip->audio_info & VX_AUDIO_INFO_MPEG2)
        snd_iprintf(buffer, " mpeg2");
    if (chip->audio_info & VX_AUDIO_INFO_LINEAR_8)
        snd_iprintf(buffer, " linear8");
    if (chip->audio_info & VX_AUDIO_INFO_LINEAR_16)
        snd_iprintf(buffer, " linear16");
    if (chip->audio_info & VX_AUDIO_INFO_LINEAR_24)
        snd_iprintf(buffer, " linear24");
    snd_iprintf(buffer, "\n");
    snd_iprintf(buffer, "Input Source: %s\n", vx_is_pcmcia(chip) ?
            audio_src_vxp[chip->audio_source] :
            audio_src_vx2[chip->audio_source]);
    snd_iprintf(buffer, "Clock Mode: %s\n", clock_mode[chip->clock_mode]);
    snd_iprintf(buffer, "Clock Source: %s\n", clock_src[chip->clock_source]);
    snd_iprintf(buffer, "Frequency: %d\n", chip->freq);
    snd_iprintf(buffer, "Detected Frequency: %d\n", chip->freq_detected);
    snd_iprintf(buffer, "Detected UER type: %s\n", uer_type[chip->uer_detected]);
    snd_iprintf(buffer, "Min/Max/Cur IBL: %d/%d/%d (granularity=%d)\n",
            chip->ibl.min_size, chip->ibl.max_size, chip->ibl.size,
            chip->ibl.granularity);
}

static void vx_proc_init(struct vx_core *chip)
{
    struct snd_info_entry *entry;

    if (! snd_card_proc_new(chip->card, "vx-status", &entry))
        snd_info_set_text_ops(entry, chip, vx_proc_read);
}


int snd_vx_dsp_boot(struct vx_core *chip, const struct firmware *boot)
{
    int err;
    int cold_reset = !(chip->chip_status & VX_STAT_DEVICE_INIT);

    vx_reset_board(chip, cold_reset);
    vx_validate_irq(chip, 0);

    if ((err = snd_vx_load_boot_image(chip, boot)) < 0)
        return err;
    msleep(10);

    return 0;
}

EXPORT_SYMBOL(snd_vx_dsp_boot);

int snd_vx_dsp_load(struct vx_core *chip, const struct firmware *dsp)
{
    unsigned int i;
    int err;
    unsigned int csum = 0;
    const unsigned char *image, *cptr;

    if (dsp->size % 3)
        return -EINVAL;

    vx_toggle_dac_mute(chip, 1);

    /* Transfert data buffer from PC to DSP */
    for (i = 0; i < dsp->size; i += 3) {
        image = dsp->data + i;
        /* Wait DSP ready for a new read */
        if ((err = vx_wait_isr_bit(chip, ISR_TX_EMPTY)) < 0) {
            printk(KERN_ERR
                   "dsp loading error at position %d\n", i);
            return err;
        }
        cptr = image;
        csum ^= *cptr;
        csum = (csum >> 24) | (csum << 8);
        vx_outb(chip, TXH, *cptr++);
        csum ^= *cptr;
        csum = (csum >> 24) | (csum << 8);
        vx_outb(chip, TXM, *cptr++);
        csum ^= *cptr;
        csum = (csum >> 24) | (csum << 8);
        vx_outb(chip, TXL, *cptr++);
    }
    snd_printdd(KERN_DEBUG "checksum = 0x%08x\n", csum);

    msleep(200);

    if ((err = vx_wait_isr_bit(chip, ISR_CHK)) < 0)
        return err;

    vx_toggle_dac_mute(chip, 0);

    vx_test_and_ack(chip);
    vx_validate_irq(chip, 1);

    return 0;
}

EXPORT_SYMBOL(snd_vx_dsp_load);

#ifdef CONFIG_PM
/*
 * suspend
 */
int snd_vx_suspend(struct vx_core *chip)
{
    unsigned int i;

    snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
    chip->chip_status |= VX_STAT_IN_SUSPEND;
    for (i = 0; i < chip->hw->num_codecs; i++)
        snd_pcm_suspend_all(chip->pcm[i]);

    return 0;
}

EXPORT_SYMBOL(snd_vx_suspend);

/*
 * resume
 */
int snd_vx_resume(struct vx_core *chip)
{
    int i, err;

    chip->chip_status &= ~VX_STAT_CHIP_INIT;

    for (i = 0; i < 4; i++) {
        if (! chip->firmware[i])
            continue;
        err = chip->ops->load_dsp(chip, i, chip->firmware[i]);
        if (err < 0) {
            snd_printk(KERN_ERR "vx: firmware resume error at DSP %d\n", i);
            return -EIO;
        }
    }

    chip->chip_status |= VX_STAT_CHIP_INIT;
    chip->chip_status &= ~VX_STAT_IN_SUSPEND;

    snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
    return 0;
}

EXPORT_SYMBOL(snd_vx_resume);
#endif

struct vx_core *snd_vx_create(struct snd_card *card, struct snd_vx_hardware *hw,
                  struct snd_vx_ops *ops,
                  int extra_size)
{
    struct vx_core *chip;

    if (snd_BUG_ON(!card || !hw || !ops))
        return NULL;

    chip = kzalloc(sizeof(*chip) + extra_size, GFP_KERNEL);
    if (! chip) {
        snd_printk(KERN_ERR "vx_core: no memory\n");
        return NULL;
    }
    spin_lock_init(&chip->lock);
    spin_lock_init(&chip->irq_lock);
    chip->irq = -1;
    chip->hw = hw;
    chip->type = hw->type;
    chip->ops = ops;
    tasklet_init(&chip->tq, vx_interrupt, (unsigned long)chip);
    mutex_init(&chip->mixer_mutex);

    chip->card = card;
    card->private_data = chip;
    strcpy(card->driver, hw->name);
    sprintf(card->shortname, "Digigram %s", hw->name);

    vx_proc_init(chip);

    return chip;
}

EXPORT_SYMBOL(snd_vx_create);

/*
 * module entries
 */
static int __init alsa_vx_core_init(void)
{
    return 0;
}

static void __exit alsa_vx_core_exit(void)
{
}

module_init(alsa_vx_core_init)
module_exit(alsa_vx_core_exit)