[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / sound / drivers / vx / vx_core.c

/*
 * Driver for Digigram VX soundcards
 *
 * Hardware core part
 *
 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   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/delay.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.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 <tiwai@suse.de>");
MODULE_DESCRIPTION("Common routines for Digigram VX drivers");
MODULE_LICENSE("GPL");


/*
 * snd_vx_delay - delay for the specified time
 * @xmsec: the time to delay in msec
 */
void snd_vx_delay(vx_core_t *chip, int xmsec)
{
        if (! in_interrupt() && xmsec >= 1000 / HZ)
                msleep(xmsec);
        else
                mdelay(xmsec);
}

/*
 * 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(vx_core_t *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;
                //snd_vx_delay(chip, 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;
}

/*
 * 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(vx_core_t *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(vx_core_t *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(vx_core_t *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(vx_core_t *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;
        snd_assert(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(vx_core_t *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(vx_core_t *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(vx_core_t *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(vx_core_t *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 */

/**
 * snd_vx_boot_xilinx - boot up the xilinx interface
 * @boot: the boot record to load
 */
int snd_vx_load_boot_image(vx_core_t *chip, const struct firmware *boot)
{
        unsigned int i;
        int no_fillup = vx_has_new_dsp(chip);

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

/*
 * vx_test_irq_src - query the source of interrupts
 *
 * called from irq handler only
 */
static int vx_test_irq_src(vx_core_t *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)
{
        vx_core_t *chip = (vx_core_t *) 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);
}


/**
 * snd_vx_irq_handler - interrupt handler
 */
irqreturn_t snd_vx_irq_handler(int irq, void *dev, struct pt_regs *regs)
{
        vx_core_t *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_hi_schedule(&chip->tq);
        return IRQ_HANDLED;
}


/*
 */
static void vx_reset_board(vx_core_t *chip, int cold_reset)
{
        snd_assert(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(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
{
        vx_core_t *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(vx_core_t *chip)
{
        snd_info_entry_t *entry;

        if (! snd_card_proc_new(chip->card, "vx-status", &entry))
                snd_info_set_text_ops(entry, chip, 1024, vx_proc_read);
}


/**
 * snd_vx_dsp_boot - load the DSP boot
 */
int snd_vx_dsp_boot(vx_core_t *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;
        snd_vx_delay(chip, 10);

        return 0;
}

/**
 * snd_vx_dsp_load - load the DSP image
 */
int snd_vx_dsp_load(vx_core_t *chip, const struct firmware *dsp)
{
        unsigned int i;
        int err;
        unsigned int csum = 0;
        unsigned char *image, *cptr;

        snd_assert(dsp->size % 3 == 0, 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("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);

        snd_vx_delay(chip, 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;
}

#ifdef CONFIG_PM
/*
 * suspend
 */
static int snd_vx_suspend(snd_card_t *card, pm_message_t state)
{
        vx_core_t *chip = card->pm_private_data;
        unsigned int i;

        snd_assert(chip, return -EINVAL);

        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;
}

/*
 * resume
 */
static int snd_vx_resume(snd_card_t *card)
{
        vx_core_t *chip = card->pm_private_data;
        int i, err;

        snd_assert(chip, return -EINVAL);

        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;

        return 0;
}

#endif

/**
 * snd_vx_create - constructor for vx_core_t
 * @hw: hardware specific record
 *
 * this function allocates the instance and prepare for the hardware
 * initialization.
 *
 * return the instance pointer if successful, NULL in error.
 */
vx_core_t *snd_vx_create(snd_card_t *card, struct snd_vx_hardware *hw,
                         struct snd_vx_ops *ops,
                         int extra_size)
{
        vx_core_t *chip;

        snd_assert(card && hw && ops, return NULL);

        chip = kcalloc(1, 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);
        init_MUTEX(&chip->mixer_mutex);

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

        snd_card_set_pm_callback(card, snd_vx_suspend, snd_vx_resume, chip);

        vx_proc_init(chip);

        return chip;
}

/*
 * 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)

/*
 * exports
 */
EXPORT_SYMBOL(snd_vx_check_reg_bit);
EXPORT_SYMBOL(snd_vx_create);
EXPORT_SYMBOL(snd_vx_setup_firmware);
EXPORT_SYMBOL(snd_vx_free_firmware);
EXPORT_SYMBOL(snd_vx_irq_handler);
EXPORT_SYMBOL(snd_vx_delay);
EXPORT_SYMBOL(snd_vx_dsp_boot);
EXPORT_SYMBOL(snd_vx_dsp_load);
EXPORT_SYMBOL(snd_vx_load_boot_image);