URL https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [sound/] [nec_vrc5477.c] - Blame information for rev 1780

Go to most recent revision | Details | Compare with Previous | View Log

/***********************************************************************
 * Copyright 2001 MontaVista Software Inc.
 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
 *
 * drivers/sound/nec_vrc5477.c
 *     AC97 sound dirver for NEC Vrc5477 chip (an integrated,
 *     multi-function controller chip for MIPS CPUs)
 *
 * VRA support Copyright 2001 Bradley D. LaRonde <brad@ltc.com>
 *
 * 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 code is derived from ite8172.c, which is written by Steve Longerbeam.
 *
 * Features:
 *   Currently we only support the following capabilities:
 *      . mono output to PCM L/R (line out).
 *      . stereo output to PCM L/R (line out).
 *      . mono input from PCM L (line in).
 *      . stereo output from PCM (line in).
 *      . sampling rate at 48k or variable sampling rate
 *      . support /dev/dsp, /dev/mixer devices, standard OSS devices.
 *      . only support 16-bit PCM format (hardware limit, no software
 *        translation)
 *      . support duplex, but no trigger or realtime.
 *
 *   Specifically the following are not supported:
 *      . app-set frag size.
 *      . mmap'ed buffer access
 */
 
/*
 * Original comments from ite8172.c file.
 */
 
/*
 *
 * Notes:
 *
 *  1. Much of the OSS buffer allocation, ioctl's, and mmap'ing are
 *     taken, slightly modified or not at all, from the ES1371 driver,
 *     so refer to the credits in es1371.c for those. The rest of the
 *     code (probe, open, read, write, the ISR, etc.) is new.
 *  2. The following support is untested:
 *      * Memory mapping the audio buffers, and the ioctl controls that go
 *        with it.
 *      * S/PDIF output.
 *  3. The following is not supported:
 *      * I2S input.
 *      * legacy audio mode.
 *  4. Support for volume button interrupts is implemented but doesn't
 *     work yet.
 *
 *  Revision history
 *    02.08.2001  0.1   Initial release
 */
 
#include <linux/version.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/slab.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/wrapper.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
 
/* -------------------debug macros -------------------------------------- */
/* #undef VRC5477_AC97_DEBUG */
#define VRC5477_AC97_DEBUG
 
#undef VRC5477_AC97_VERBOSE_DEBUG
/* #define VRC5477_AC97_VERBOSE_DEBUG */
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
#define VRC5477_AC97_DEBUG
#endif
 
#if defined(VRC5477_AC97_DEBUG)
#include <linux/kernel.h>
#define ASSERT(x)  if (!(x)) { \
        panic("assertion failed at %s:%d: %s\n", __FILE__, __LINE__, #x); }
#else
#define ASSERT(x)
#endif /* VRC5477_AC97_DEBUG */
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
static u16 inTicket=0;           /* check sync between intr & write */
static u16 outTicket=0;
#endif
 
/* --------------------------------------------------------------------- */
 
#undef OSS_DOCUMENTED_MIXER_SEMANTICS
 
static const unsigned sample_shift[] = { 0, 1, 1, 2 };
 
#define         VRC5477_INT_CLR         0x0
#define         VRC5477_INT_STATUS      0x0
#define         VRC5477_CODEC_WR        0x4
#define         VRC5477_CODEC_RD        0x8
#define         VRC5477_CTRL            0x18
#define         VRC5477_ACLINK_CTRL     0x1c
#define         VRC5477_INT_MASK        0x24
 
#define         VRC5477_DAC1_CTRL       0x30
#define         VRC5477_DAC1L           0x34
#define         VRC5477_DAC1_BADDR      0x38
#define         VRC5477_DAC2_CTRL       0x3c
#define         VRC5477_DAC2L           0x40
#define         VRC5477_DAC2_BADDR      0x44
#define         VRC5477_DAC3_CTRL       0x48
#define         VRC5477_DAC3L           0x4c
#define         VRC5477_DAC3_BADDR      0x50
 
#define         VRC5477_ADC1_CTRL       0x54
#define         VRC5477_ADC1L           0x58
#define         VRC5477_ADC1_BADDR      0x5c
#define         VRC5477_ADC2_CTRL       0x60
#define         VRC5477_ADC2L           0x64
#define         VRC5477_ADC2_BADDR      0x68
#define         VRC5477_ADC3_CTRL       0x6c
#define         VRC5477_ADC3L           0x70
#define         VRC5477_ADC3_BADDR      0x74
 
#define         VRC5477_CODEC_WR_RWC    (1 << 23)
 
#define         VRC5477_CODEC_RD_RRDYA  (1 << 31)
#define         VRC5477_CODEC_RD_RRDYD  (1 << 30)
 
#define         VRC5477_ACLINK_CTRL_RST_ON      (1 << 15)
#define         VRC5477_ACLINK_CTRL_RST_TIME    0x7f
#define         VRC5477_ACLINK_CTRL_SYNC_ON     (1 << 30)
#define         VRC5477_ACLINK_CTRL_CK_STOP_ON  (1 << 31)
 
#define         VRC5477_CTRL_DAC2ENB            (1 << 15) 
#define         VRC5477_CTRL_ADC2ENB            (1 << 14) 
#define         VRC5477_CTRL_DAC1ENB            (1 << 13) 
#define         VRC5477_CTRL_ADC1ENB            (1 << 12) 
 
#define         VRC5477_INT_MASK_NMASK          (1 << 31) 
#define         VRC5477_INT_MASK_DAC1END        (1 << 5) 
#define         VRC5477_INT_MASK_DAC2END        (1 << 4) 
#define         VRC5477_INT_MASK_DAC3END        (1 << 3) 
#define         VRC5477_INT_MASK_ADC1END        (1 << 2) 
#define         VRC5477_INT_MASK_ADC2END        (1 << 1) 
#define         VRC5477_INT_MASK_ADC3END        (1 << 0) 
 
#define         VRC5477_DMA_ACTIVATION          (1 << 31)
#define         VRC5477_DMA_WIP                 (1 << 30)
 
 
#define VRC5477_AC97_MODULE_NAME "NEC_Vrc5477_audio"
#define PFX VRC5477_AC97_MODULE_NAME ": "
 
/* --------------------------------------------------------------------- */
 
struct vrc5477_ac97_state {
        /* list of vrc5477_ac97 devices */
        struct list_head devs;
 
        /* the corresponding pci_dev structure */
        struct pci_dev *dev;
 
        /* soundcore stuff */
        int dev_audio;
 
        /* hardware resources */
        unsigned long io;
        unsigned int irq;
 
#ifdef VRC5477_AC97_DEBUG
        /* debug /proc entry */
        struct proc_dir_entry *ps;
        struct proc_dir_entry *ac97_ps;
#endif /* VRC5477_AC97_DEBUG */
 
        struct ac97_codec *codec;
 
        unsigned dacChannels, adcChannels;
        unsigned short dacRate, adcRate;
        unsigned short extended_status;
 
        spinlock_t lock;
        struct semaphore open_sem;
        mode_t open_mode;
        wait_queue_head_t open_wait;
 
        struct dmabuf {
                void *lbuf, *rbuf;
                dma_addr_t lbufDma, rbufDma;
                unsigned bufOrder;
                unsigned numFrag;
                unsigned fragShift;
                unsigned fragSize;      /* redundant */
                unsigned fragTotalSize; /* = numFrag * fragSize(real)  */
                unsigned nextIn;
                unsigned nextOut;
                int count;
                unsigned error; /* over/underrun */
                wait_queue_head_t wait;
                /* OSS stuff */
                unsigned stopped:1;
                unsigned ready:1;
        } dma_dac, dma_adc;
 
        #define WORK_BUF_SIZE   2048
        struct {
                u16 lchannel;
                u16 rchannel;
        } workBuf[WORK_BUF_SIZE/4];
};
 
/* --------------------------------------------------------------------- */
 
static LIST_HEAD(devs);
 
/* --------------------------------------------------------------------- */
 
static inline unsigned ld2(unsigned int x)
{
    unsigned r = 0;
 
    if (x >= 0x10000) {
        x >>= 16;
        r += 16;
    }
    if (x >= 0x100) {
        x >>= 8;
        r += 8;
    }
    if (x >= 0x10) {
        x >>= 4;
        r += 4;
    }
    if (x >= 4) {
        x >>= 2;
        r += 2;
    }
    if (x >= 2)
        r++;
    return r;
}
 
/* --------------------------------------------------------------------- */
 
static u16 rdcodec(struct ac97_codec *codec, u8 addr)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)codec->private_data;
        unsigned long flags;
        u32 result;
 
        spin_lock_irqsave(&s->lock, flags);
 
        /* wait until we can access codec registers */
        while (inl(s->io + VRC5477_CODEC_WR) & 0x80000000);
 
        /* write the address and "read" command to codec */
        addr = addr & 0x7f;
        outl((addr << 16) | VRC5477_CODEC_WR_RWC, s->io + VRC5477_CODEC_WR);
 
        /* get the return result */
        udelay(100); /* workaround hardware bug */
        while ( (result = inl(s->io + VRC5477_CODEC_RD)) &
                (VRC5477_CODEC_RD_RRDYA | VRC5477_CODEC_RD_RRDYD) ) {
                /* we get either addr or data, or both */
                if (result & VRC5477_CODEC_RD_RRDYA) {
                        ASSERT(addr == ((result >> 16) & 0x7f) );
                }
                if (result & VRC5477_CODEC_RD_RRDYD) {
                        break;
                }
        }
 
        spin_unlock_irqrestore(&s->lock, flags);
 
        return result & 0xffff;;
}
 
 
static void wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)codec->private_data;
        unsigned long flags;
 
        spin_lock_irqsave(&s->lock, flags);
 
        /* wait until we can access codec registers */
        while (inl(s->io + VRC5477_CODEC_WR) & 0x80000000);
 
        /* write the address and value to codec */
        outl((addr << 16) | data, s->io + VRC5477_CODEC_WR);
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
 
static void waitcodec(struct ac97_codec *codec)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)codec->private_data;
 
        /* wait until we can access codec registers */
        while (inl(s->io + VRC5477_CODEC_WR) & 0x80000000);
}
 
static int ac97_codec_not_present(struct ac97_codec *codec)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)codec->private_data;
        unsigned long flags;
        unsigned short count  = 0xffff;
 
        spin_lock_irqsave(&s->lock, flags);
 
        /* wait until we can access codec registers */
        do {
               if (!(inl(s->io + VRC5477_CODEC_WR) & 0x80000000))
                       break;
        } while (--count);
 
        if (count == 0) {
                spin_unlock_irqrestore(&s->lock, flags);
                return -1;
        }
 
        /* write 0 to reset */
        outl((AC97_RESET << 16) | 0, s->io + VRC5477_CODEC_WR);
 
        /* test whether we get a response from ac97 chip */
        count  = 0xffff;
        do {
               if (!(inl(s->io + VRC5477_CODEC_WR) & 0x80000000))
                       break;
        } while (--count);
 
        if (count == 0) {
                spin_unlock_irqrestore(&s->lock, flags);
                return -1;
        }
        spin_unlock_irqrestore(&s->lock, flags);
        return 0;
}
 
/* --------------------------------------------------------------------- */
 
static void vrc5477_ac97_delay(int msec)
{
        unsigned long tmo;
        signed long tmo2;
 
        if (in_interrupt())
                return;
 
        tmo = jiffies + (msec*HZ)/1000;
        for (;;) {
                tmo2 = tmo - jiffies;
                if (tmo2 <= 0)
                        break;
                schedule_timeout(tmo2);
        }
}
 
 
static void set_adc_rate(struct vrc5477_ac97_state *s, unsigned rate)
{
        wrcodec(s->codec, AC97_PCM_LR_ADC_RATE, rate);
        s->adcRate = rate;
}
 
 
static void set_dac_rate(struct vrc5477_ac97_state *s, unsigned rate)
{
        if(s->extended_status & AC97_EXTSTAT_VRA) {
        wrcodec(s->codec, AC97_PCM_FRONT_DAC_RATE, rate);
                s->dacRate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE);
        }
}
 
 
/* --------------------------------------------------------------------- */
 
static inline void
stop_dac(struct vrc5477_ac97_state *s)
{
        struct dmabuf* db = &s->dma_dac;
        unsigned long flags;
        u32 temp;
 
        spin_lock_irqsave(&s->lock, flags);
 
        if (db->stopped) {
                spin_unlock_irqrestore(&s->lock, flags);
                return;
        }
 
        /* deactivate the dma */
        outl(0, s->io + VRC5477_DAC1_CTRL);
        outl(0, s->io + VRC5477_DAC2_CTRL);
 
        /* wait for DAM completely stop */
        while (inl(s->io + VRC5477_DAC1_CTRL) & VRC5477_DMA_WIP);
        while (inl(s->io + VRC5477_DAC2_CTRL) & VRC5477_DMA_WIP);
 
        /* disable dac slots in aclink */
        temp = inl(s->io + VRC5477_CTRL);
        temp &= ~ (VRC5477_CTRL_DAC1ENB | VRC5477_CTRL_DAC2ENB);
        outl (temp, s->io + VRC5477_CTRL);
 
        /* disable interrupts */
        temp = inl(s->io + VRC5477_INT_MASK);
        temp &= ~ (VRC5477_INT_MASK_DAC1END | VRC5477_INT_MASK_DAC2END);
        outl (temp, s->io + VRC5477_INT_MASK);
 
        /* clear pending ones */
        outl(VRC5477_INT_MASK_DAC1END | VRC5477_INT_MASK_DAC2END,
             s->io +  VRC5477_INT_CLR);
 
        db->stopped = 1;
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
static void start_dac(struct vrc5477_ac97_state *s)
{
        struct dmabuf* db = &s->dma_dac;
        unsigned long flags;
        u32 dmaLength;
        u32 temp;
 
        spin_lock_irqsave(&s->lock, flags);
 
        if (!db->stopped) {
                spin_unlock_irqrestore(&s->lock, flags);
                return;
        }
 
        /* we should have some data to do the DMA trasnfer */
        ASSERT(db->count >= db->fragSize);
 
        /* clear pending fales interrupts */
        outl(VRC5477_INT_MASK_DAC1END | VRC5477_INT_MASK_DAC2END,
             s->io +  VRC5477_INT_CLR);
 
        /* enable interrupts */
        temp = inl(s->io + VRC5477_INT_MASK);
        temp |= VRC5477_INT_MASK_DAC1END | VRC5477_INT_MASK_DAC2END;
        outl(temp, s->io +  VRC5477_INT_MASK);
 
        /* setup dma base addr */
        outl(db->lbufDma + db->nextOut, s->io + VRC5477_DAC1_BADDR);
        if (s->dacChannels == 1) {
                outl(db->lbufDma + db->nextOut, s->io + VRC5477_DAC2_BADDR);
        } else {
                outl(db->rbufDma + db->nextOut, s->io + VRC5477_DAC2_BADDR);
        }
 
        /* set dma length, in the unit of 0x10 bytes */
        dmaLength = db->fragSize >> 4;
        outl(dmaLength, s->io + VRC5477_DAC1L);
        outl(dmaLength, s->io + VRC5477_DAC2L);
 
        /* activate dma */
        outl(VRC5477_DMA_ACTIVATION, s->io + VRC5477_DAC1_CTRL);
        outl(VRC5477_DMA_ACTIVATION, s->io + VRC5477_DAC2_CTRL);
 
        /* enable dac slots - we should hear the music now! */
        temp = inl(s->io + VRC5477_CTRL);
        temp |= (VRC5477_CTRL_DAC1ENB | VRC5477_CTRL_DAC2ENB);
        outl (temp, s->io + VRC5477_CTRL);
 
        /* it is time to setup next dma transfer */
        ASSERT(inl(s->io + VRC5477_DAC1_CTRL) & VRC5477_DMA_WIP);
        ASSERT(inl(s->io + VRC5477_DAC2_CTRL) & VRC5477_DMA_WIP);
 
        temp = db->nextOut + db->fragSize;
        if (temp >= db->fragTotalSize) {
                ASSERT(temp == db->fragTotalSize);
                temp = 0;
        }
 
        outl(db->lbufDma + temp, s->io + VRC5477_DAC1_BADDR);
        if (s->dacChannels == 1) {
                outl(db->lbufDma + temp, s->io + VRC5477_DAC2_BADDR);
        } else {
                outl(db->rbufDma + temp, s->io + VRC5477_DAC2_BADDR);
        }
 
        db->stopped = 0;
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
        outTicket = *(u16*)(db->lbuf+db->nextOut);
        if (db->count > db->fragSize) {
                ASSERT((u16)(outTicket+1) == *(u16*)(db->lbuf+temp));
        }
#endif
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
static inline void stop_adc(struct vrc5477_ac97_state *s)
{
        struct dmabuf* db = &s->dma_adc;
        unsigned long flags;
        u32 temp;
 
        spin_lock_irqsave(&s->lock, flags);
 
        if (db->stopped) {
                spin_unlock_irqrestore(&s->lock, flags);
                return;
        }
 
        /* deactivate the dma */
        outl(0, s->io + VRC5477_ADC1_CTRL);
        outl(0, s->io + VRC5477_ADC2_CTRL);
 
        /* disable adc slots in aclink */
        temp = inl(s->io + VRC5477_CTRL);
        temp &= ~ (VRC5477_CTRL_ADC1ENB | VRC5477_CTRL_ADC2ENB);
        outl (temp, s->io + VRC5477_CTRL);
 
        /* disable interrupts */
        temp = inl(s->io + VRC5477_INT_MASK);
        temp &= ~ (VRC5477_INT_MASK_ADC1END | VRC5477_INT_MASK_ADC2END);
        outl (temp, s->io + VRC5477_INT_MASK);
 
        /* clear pending ones */
        outl(VRC5477_INT_MASK_ADC1END | VRC5477_INT_MASK_ADC2END,
             s->io +  VRC5477_INT_CLR);
 
        db->stopped = 1;
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
static void start_adc(struct vrc5477_ac97_state *s)
{
        struct dmabuf* db = &s->dma_adc;
        unsigned long flags;
        u32 dmaLength;
        u32 temp;
 
        spin_lock_irqsave(&s->lock, flags);
 
        if (!db->stopped) {
                spin_unlock_irqrestore(&s->lock, flags);
                return;
        }
 
        /* we should at least have some free space in the buffer */
        ASSERT(db->count < db->fragTotalSize - db->fragSize * 2);
 
        /* clear pending ones */
        outl(VRC5477_INT_MASK_ADC1END | VRC5477_INT_MASK_ADC2END,
             s->io +  VRC5477_INT_CLR);
 
        /* enable interrupts */
        temp = inl(s->io + VRC5477_INT_MASK);
        temp |= VRC5477_INT_MASK_ADC1END | VRC5477_INT_MASK_ADC2END;
        outl(temp, s->io +  VRC5477_INT_MASK);
 
        /* setup dma base addr */
        outl(db->lbufDma + db->nextIn, s->io + VRC5477_ADC1_BADDR);
        outl(db->rbufDma + db->nextIn, s->io + VRC5477_ADC2_BADDR);
 
        /* setup dma length */
        dmaLength = db->fragSize >> 4;
        outl(dmaLength, s->io + VRC5477_ADC1L);
        outl(dmaLength, s->io + VRC5477_ADC2L);
 
        /* activate dma */
        outl(VRC5477_DMA_ACTIVATION, s->io + VRC5477_ADC1_CTRL);
        outl(VRC5477_DMA_ACTIVATION, s->io + VRC5477_ADC2_CTRL);
 
        /* enable adc slots */
        temp = inl(s->io + VRC5477_CTRL);
        temp |= (VRC5477_CTRL_ADC1ENB | VRC5477_CTRL_ADC2ENB);
        outl (temp, s->io + VRC5477_CTRL);
 
        /* it is time to setup next dma transfer */
        temp = db->nextIn + db->fragSize;
        if (temp >= db->fragTotalSize) {
                ASSERT(temp == db->fragTotalSize);
                temp = 0;
        }
        outl(db->lbufDma + temp, s->io + VRC5477_ADC1_BADDR);
        outl(db->rbufDma + temp, s->io + VRC5477_ADC2_BADDR);
 
        db->stopped = 0;
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
/* --------------------------------------------------------------------- */
 
#define DMABUF_DEFAULTORDER (16-PAGE_SHIFT)
#define DMABUF_MINORDER 1
 
static inline void dealloc_dmabuf(struct vrc5477_ac97_state *s,
                                  struct dmabuf *db)
{
        if (db->lbuf) {
                ASSERT(db->rbuf);
                pci_free_consistent(s->dev, PAGE_SIZE << db->bufOrder,
                                    db->lbuf, db->lbufDma);
                pci_free_consistent(s->dev, PAGE_SIZE << db->bufOrder,
                                    db->rbuf, db->rbufDma);
                db->lbuf = db->rbuf = NULL;
        }
        db->nextIn = db->nextOut = 0;
        db->ready = 0;
}
 
static int prog_dmabuf(struct vrc5477_ac97_state *s,
                       struct dmabuf *db,
                       unsigned rate)
{
        int order;
        unsigned bufsize;
 
        if (!db->lbuf) {
                ASSERT(!db->rbuf);
 
                db->ready = 0;
                for (order = DMABUF_DEFAULTORDER;
                     order >= DMABUF_MINORDER;
                     order--) {
                        db->lbuf = pci_alloc_consistent(s->dev,
                                                        PAGE_SIZE << order,
                                                        &db->lbufDma);
                        db->rbuf = pci_alloc_consistent(s->dev,
                                                        PAGE_SIZE << order,
                                                        &db->rbufDma);
                        if (db->lbuf && db->rbuf) break;
                        if (db->lbuf) {
                            ASSERT(!db->rbuf);
                            pci_free_consistent(s->dev,
                                                PAGE_SIZE << order,
                                                db->lbuf,
                                                db->lbufDma);
                        }
                }
                if (!db->lbuf) {
                        ASSERT(!db->rbuf);
                        return -ENOMEM;
                }
 
                db->bufOrder = order;
        }
 
        db->count = 0;
        db->nextIn = db->nextOut = 0;
 
        bufsize = PAGE_SIZE << db->bufOrder;
        db->fragShift = ld2(rate * 2 / 100);
        if (db->fragShift < 4) db->fragShift = 4;
 
        db->numFrag = bufsize >> db->fragShift;
        while (db->numFrag < 4 && db->fragShift > 4) {
                db->fragShift--;
                db->numFrag = bufsize >> db->fragShift;
        }
        db->fragSize = 1 << db->fragShift;
        db->fragTotalSize = db->numFrag << db->fragShift;
        memset(db->lbuf, 0, db->fragTotalSize);
        memset(db->rbuf, 0, db->fragTotalSize);
 
        db->ready = 1;
 
        return 0;
}
 
static inline int prog_dmabuf_adc(struct vrc5477_ac97_state *s)
{
    stop_adc(s);
    return prog_dmabuf(s, &s->dma_adc, s->adcRate);
}
 
static inline int prog_dmabuf_dac(struct vrc5477_ac97_state *s)
{
    stop_dac(s);
    return prog_dmabuf(s, &s->dma_dac, s->dacRate);
}
 
 
/* --------------------------------------------------------------------- */
/* hold spinlock for the following! */
 
static inline void vrc5477_ac97_adc_interrupt(struct vrc5477_ac97_state *s)
{
        struct dmabuf* adc = &s->dma_adc;
        unsigned temp;
 
        /* we need two frags avaiable because one is already being used
         * and the other will be used when next interrupt happens.
         */
        if (adc->count >= adc->fragTotalSize - adc->fragSize) {
                stop_adc(s);
                adc->error++;
                printk(KERN_INFO PFX "adc overrun\n");
                return;
        }
 
        /* set the base addr for next DMA transfer */
        temp = adc->nextIn + 2*adc->fragSize;
        if (temp >= adc->fragTotalSize) {
                ASSERT( (temp == adc->fragTotalSize) ||
                             (temp == adc->fragTotalSize + adc->fragSize) );
                temp -= adc->fragTotalSize;
        }
        outl(adc->lbufDma + temp, s->io + VRC5477_ADC1_BADDR);
        outl(adc->rbufDma + temp, s->io + VRC5477_ADC2_BADDR);
 
        /* adjust nextIn */
        adc->nextIn += adc->fragSize;
        if (adc->nextIn >= adc->fragTotalSize) {
                ASSERT(adc->nextIn == adc->fragTotalSize);
                adc->nextIn = 0;
        }
 
        /* adjust count */
        adc->count += adc->fragSize;
 
        /* wake up anybody listening */
        if (waitqueue_active(&adc->wait)) {
                wake_up_interruptible(&adc->wait);
        }
}
 
static inline void vrc5477_ac97_dac_interrupt(struct vrc5477_ac97_state *s)
{
        struct dmabuf* dac = &s->dma_dac;
        unsigned temp;
 
        /* next DMA transfer should already started */
        // ASSERT(inl(s->io + VRC5477_DAC1_CTRL) & VRC5477_DMA_WIP);
        // ASSERT(inl(s->io + VRC5477_DAC2_CTRL) & VRC5477_DMA_WIP);
 
        /* let us set for next next DMA transfer */
        temp = dac->nextOut + dac->fragSize*2;
        if (temp >= dac->fragTotalSize) {
                ASSERT( (temp == dac->fragTotalSize) ||
                             (temp == dac->fragTotalSize + dac->fragSize) );
                temp -= dac->fragTotalSize;
        }
        outl(dac->lbufDma + temp, s->io + VRC5477_DAC1_BADDR);
        if (s->dacChannels == 1) {
                outl(dac->lbufDma + temp, s->io + VRC5477_DAC2_BADDR);
        } else {
                outl(dac->rbufDma + temp, s->io + VRC5477_DAC2_BADDR);
        }
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
        if (*(u16*)(dac->lbuf +  dac->nextOut) != outTicket) {
                printk("assert fail: - %d vs %d\n",
                        *(u16*)(dac->lbuf +  dac->nextOut),
                        outTicket);
                ASSERT(1 == 0);
        }
#endif
 
        /* adjust nextOut pointer */
        dac->nextOut += dac->fragSize;
        if (dac->nextOut >= dac->fragTotalSize) {
                ASSERT(dac->nextOut == dac->fragTotalSize);
                dac->nextOut = 0;
        }
 
        /* adjust count */
        dac->count -= dac->fragSize;
        if (dac->count <=0 ) {
                /* buffer under run */
                dac->count = 0;
                dac->nextIn = dac->nextOut;
                stop_dac(s);
        }
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
        if (dac->count) {
                outTicket ++;
                ASSERT(*(u16*)(dac->lbuf +  dac->nextOut) == outTicket);
        }
#endif
 
        /* we cannot have both under run and someone is waiting on us */
        ASSERT(! (waitqueue_active(&dac->wait) && (dac->count <= 0)) );
 
        /* wake up anybody listening */
        if (waitqueue_active(&dac->wait))
                wake_up_interruptible(&dac->wait);
}
 
static void vrc5477_ac97_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
        struct vrc5477_ac97_state *s = (struct vrc5477_ac97_state *)dev_id;
        u32 irqStatus;
        u32 adcInterrupts, dacInterrupts;
 
        spin_lock(&s->lock);
 
        /* get irqStatus and clear the detected ones */
        irqStatus = inl(s->io + VRC5477_INT_STATUS);
        outl(irqStatus, s->io + VRC5477_INT_CLR);
 
        /* let us see what we get */
        dacInterrupts = VRC5477_INT_MASK_DAC1END | VRC5477_INT_MASK_DAC2END;
        adcInterrupts = VRC5477_INT_MASK_ADC1END | VRC5477_INT_MASK_ADC2END;
        if (irqStatus & dacInterrupts) {
                /* we should get both interrupts, but just in case ...  */
                if (irqStatus & VRC5477_INT_MASK_DAC1END) {
                        vrc5477_ac97_dac_interrupt(s);
                }
                if ( (irqStatus & dacInterrupts) != dacInterrupts ) {
                        printk(KERN_WARNING "vrc5477_ac97 : dac interrupts not in sync!!!\n");
                        stop_dac(s);
                        start_dac(s);
                }
        } else if (irqStatus & adcInterrupts) {
                /* we should get both interrupts, but just in case ...  */
                if(irqStatus & VRC5477_INT_MASK_ADC1END) {
                        vrc5477_ac97_adc_interrupt(s);
                }
                if ( (irqStatus & adcInterrupts) != adcInterrupts ) {
                        printk(KERN_WARNING "vrc5477_ac97 : adc interrupts not in sync!!!\n");
                        stop_adc(s);
                        start_adc(s);
                }
        }
 
        spin_unlock(&s->lock);
}
 
/* --------------------------------------------------------------------- */
 
static int vrc5477_ac97_open_mixdev(struct inode *inode, struct file *file)
{
        int minor = MINOR(inode->i_rdev);
        struct list_head *list;
        struct vrc5477_ac97_state *s;
 
        for (list = devs.next; ; list = list->next) {
                if (list == &devs)
                        return -ENODEV;
                s = list_entry(list, struct vrc5477_ac97_state, devs);
                if (s->codec->dev_mixer == minor)
                        break;
        }
        file->private_data = s;
        return 0;
}
 
static int vrc5477_ac97_release_mixdev(struct inode *inode, struct file *file)
{
        return 0;
}
 
 
static int mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd,
                        unsigned long arg)
{
        return codec->mixer_ioctl(codec, cmd, arg);
}
 
static int vrc5477_ac97_ioctl_mixdev(struct inode *inode, struct file *file,
                                     unsigned int cmd, unsigned long arg)
{
    struct vrc5477_ac97_state *s =
            (struct vrc5477_ac97_state *)file->private_data;
    struct ac97_codec *codec = s->codec;
 
    return mixdev_ioctl(codec, cmd, arg);
}
 
static /*const*/ struct file_operations vrc5477_ac97_mixer_fops = {
        owner:          THIS_MODULE,
        llseek:         no_llseek,
        ioctl:          vrc5477_ac97_ioctl_mixdev,
        open:           vrc5477_ac97_open_mixdev,
        release:        vrc5477_ac97_release_mixdev,
};
 
/* --------------------------------------------------------------------- */
 
static int drain_dac(struct vrc5477_ac97_state *s, int nonblock)
{
        unsigned long flags;
        int count, tmo;
 
        if (!s->dma_dac.ready)
                return 0;
 
        for (;;) {
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_dac.count;
                spin_unlock_irqrestore(&s->lock, flags);
                if (count <= 0)
                        break;
                if (signal_pending(current))
                        break;
                if (nonblock)
                        return -EBUSY;
                tmo = 1000 * count / s->dacRate / 2;
                vrc5477_ac97_delay(tmo);
        }
        if (signal_pending(current))
                return -ERESTARTSYS;
        return 0;
}
 
/* --------------------------------------------------------------------- */
 
static int inline
copy_two_channel_adc_to_user(struct vrc5477_ac97_state *s,
                             char *buffer,
                             int copyCount)
{
        struct dmabuf *db = &s->dma_adc;
        int bufStart = db->nextOut;
        for (; copyCount > 0; ) {
                int i;
                int count = copyCount;
                if (count > WORK_BUF_SIZE/2) count = WORK_BUF_SIZE/2;
                for (i=0; i< count/2; i++) {
                        s->workBuf[i].lchannel =
                                *(u16*)(db->lbuf + bufStart + i*2);
                        s->workBuf[i].rchannel =
                                *(u16*)(db->rbuf + bufStart + i*2);
                }
                if (copy_to_user(buffer, s->workBuf, count*2)) {
                        return -1;
                }
 
                copyCount -= count;
                bufStart += count;
                ASSERT(bufStart <= db->fragTotalSize);
                buffer += count *2;
        }
        return 0;
}
 
/* return the total bytes that is copied */
static int inline
copy_adc_to_user(struct vrc5477_ac97_state *s,
                 char * buffer,
                 size_t count,
                 int avail)
{
        struct dmabuf *db = &s->dma_adc;
        int copyCount=0;
        int copyFragCount=0;
        int totalCopyCount = 0;
        int totalCopyFragCount = 0;
        unsigned long flags;
 
        /* adjust count to signel channel byte count */
        count >>= s->adcChannels - 1;
 
        /* we may have to "copy" twice as ring buffer wraps around */
        for (; (avail > 0) && (count > 0); ) {
                /* determine max possible copy count for single channel */
                copyCount = count;
                if (copyCount > avail) {
                        copyCount = avail;
                }
                if (copyCount + db->nextOut > db->fragTotalSize) {
                        copyCount = db->fragTotalSize - db->nextOut;
                        ASSERT((copyCount % db->fragSize) == 0);
                }
 
                copyFragCount = (copyCount-1) >> db->fragShift;
                copyFragCount = (copyFragCount+1) << db->fragShift;
                ASSERT(copyFragCount >= copyCount);
 
                /* we copy differently based on adc channels */
                if (s->adcChannels == 1) {
                        if (copy_to_user(buffer,
                                         db->lbuf + db->nextOut,
                                         copyCount))
                                return -1;
                } else {
                        /* *sigh* we have to mix two streams into one  */
                        if (copy_two_channel_adc_to_user(s, buffer, copyCount))
                                return -1;
                }
 
                count -= copyCount;
                totalCopyCount += copyCount;
                avail -= copyFragCount;
                totalCopyFragCount += copyFragCount;
 
                buffer += copyCount << (s->adcChannels-1);
 
                db->nextOut += copyFragCount;
                if (db->nextOut >= db->fragTotalSize) {
                        ASSERT(db->nextOut == db->fragTotalSize);
                        db->nextOut = 0;
                }
 
                ASSERT((copyFragCount % db->fragSize) == 0);
                ASSERT( (count == 0) || (copyCount == copyFragCount));
        }
 
        spin_lock_irqsave(&s->lock, flags);
        db->count -= totalCopyFragCount;
        spin_unlock_irqrestore(&s->lock, flags);
 
        return totalCopyCount << (s->adcChannels-1);
}
 
static ssize_t
vrc5477_ac97_read(struct file *file,
                  char *buffer,
                  size_t count,
                  loff_t *ppos)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)file->private_data;
        struct dmabuf *db = &s->dma_adc;
        ssize_t ret = 0;
        unsigned long flags;
        int copyCount;
        size_t avail;
 
        if (ppos != &file->f_pos)
                return -ESPIPE;
        if (!access_ok(VERIFY_WRITE, buffer, count))
                return -EFAULT;
 
        ASSERT(db->ready);
 
        while (count > 0) {
                // wait for samples in capture buffer
                do {
                        spin_lock_irqsave(&s->lock, flags);
                        if (db->stopped)
                                start_adc(s);
                        avail = db->count;
                        spin_unlock_irqrestore(&s->lock, flags);
                        if (avail <= 0) {
                                if (file->f_flags & O_NONBLOCK) {
                                        if (!ret)
                                                ret = -EAGAIN;
                                        return ret;
                                }
                                interruptible_sleep_on(&db->wait);
                                if (signal_pending(current)) {
                                        if (!ret)
                                                ret = -ERESTARTSYS;
                                        return ret;
                                }
                        }
                } while (avail <= 0);
 
                ASSERT( (avail % db->fragSize) == 0);
                copyCount = copy_adc_to_user(s, buffer, count, avail);
                if (copyCount <=0 ) {
                        if (!ret) ret = -EFAULT;
                        return ret;
                }
 
                count -= copyCount;
                buffer += copyCount;
                ret += copyCount;
        } // while (count > 0)
 
        return ret;
}
 
static int inline
copy_two_channel_dac_from_user(struct vrc5477_ac97_state *s,
                               const char *buffer,
                               int copyCount)
{
        struct dmabuf *db = &s->dma_dac;
        int bufStart = db->nextIn;
 
        ASSERT(db->ready);
 
        for (; copyCount > 0; ) {
                int i;
                int count = copyCount;
                if (count > WORK_BUF_SIZE/2) count = WORK_BUF_SIZE/2;
                if (copy_from_user(s->workBuf, buffer, count*2)) {
                        return -1;
                }
                for (i=0; i< count/2; i++) {
                        *(u16*)(db->lbuf + bufStart + i*2) =
                                s->workBuf[i].lchannel;
                        *(u16*)(db->rbuf + bufStart + i*2) =
                                s->workBuf[i].rchannel;
                }
 
                copyCount -= count;
                bufStart += count;
                ASSERT(bufStart <= db->fragTotalSize);
                buffer += count *2;
        }
        return 0;
 
}
 
/* return the total bytes that is copied */
static int inline
copy_dac_from_user(struct vrc5477_ac97_state *s,
                   const char *buffer,
                   size_t count,
                   int avail)
{
        struct dmabuf *db = &s->dma_dac;
        int copyCount=0;
        int copyFragCount=0;
        int totalCopyCount = 0;
        int totalCopyFragCount = 0;
        unsigned long flags;
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
        int i;
#endif
 
        /* adjust count to signel channel byte count */
        count >>= s->dacChannels - 1;
 
        /* we may have to "copy" twice as ring buffer wraps around */
        for (; (avail > 0) && (count > 0); ) {
                /* determine max possible copy count for single channel */
                copyCount = count;
                if (copyCount > avail) {
                        copyCount = avail;
                }
                if (copyCount + db->nextIn > db->fragTotalSize) {
                        copyCount = db->fragTotalSize - db->nextIn;
                        ASSERT(copyCount > 0);
                }
 
                copyFragCount = copyCount;
                ASSERT(copyFragCount >= copyCount);
 
                /* we copy differently based on the number channels */
                if (s->dacChannels == 1) {
                        if (copy_from_user(db->lbuf + db->nextIn,
                                           buffer,
                                           copyCount))
                                return -1;
                        /* fill gaps with 0 */
                        memset(db->lbuf + db->nextIn + copyCount,
                               0,
                               copyFragCount - copyCount);
                } else {
                        /* we have demux the stream into two separate ones */
                        if (copy_two_channel_dac_from_user(s, buffer, copyCount))
                                return -1;
                        /* fill gaps with 0 */
                        memset(db->lbuf + db->nextIn + copyCount,
                               0,
                               copyFragCount - copyCount);
                        memset(db->rbuf + db->nextIn + copyCount,
                               0,
                               copyFragCount - copyCount);
                }
 
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
                for (i=0; i< copyFragCount; i+= db->fragSize) {
                        *(u16*)(db->lbuf + db->nextIn + i) = inTicket ++;
                }
#endif
 
                count -= copyCount;
                totalCopyCount += copyCount;
                avail -= copyFragCount;
                totalCopyFragCount += copyFragCount;
 
                buffer += copyCount << (s->dacChannels - 1);
 
                db->nextIn += copyFragCount;
                if (db->nextIn >= db->fragTotalSize) {
                        ASSERT(db->nextIn == db->fragTotalSize);
                        db->nextIn = 0;
                }
 
                ASSERT( (count == 0) || (copyCount == copyFragCount));
        }
 
        spin_lock_irqsave(&s->lock, flags);
        db->count += totalCopyFragCount;
        if (db->stopped) {
                start_dac(s);
        }
 
        /* nextIn should not be equal to nextOut unless we are full */
        ASSERT( ( (db->count == db->fragTotalSize) &&
                       (db->nextIn == db->nextOut) ) ||
                     ( (db->count < db->fragTotalSize) &&
                       (db->nextIn != db->nextOut) ) );
 
        spin_unlock_irqrestore(&s->lock, flags);
 
        return totalCopyCount << (s->dacChannels-1);
 
}
 
static ssize_t vrc5477_ac97_write(struct file *file, const char *buffer,
                                  size_t count, loff_t *ppos)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)file->private_data;
        struct dmabuf *db = &s->dma_dac;
        ssize_t ret;
        unsigned long flags;
        int copyCount, avail;
 
        if (ppos != &file->f_pos)
                return -ESPIPE;
        if (!access_ok(VERIFY_READ, buffer, count))
                return -EFAULT;
        ret = 0;
 
        while (count > 0) {
                // wait for space in playback buffer
                do {
                        spin_lock_irqsave(&s->lock, flags);
                        avail = db->fragTotalSize - db->count;
                        spin_unlock_irqrestore(&s->lock, flags);
                        if (avail <= 0) {
                                if (file->f_flags & O_NONBLOCK) {
                                        if (!ret)
                                                ret = -EAGAIN;
                                        return ret;
                                }
                                interruptible_sleep_on(&db->wait);
                                if (signal_pending(current)) {
                                        if (!ret)
                                                ret = -ERESTARTSYS;
                                        return ret;
                                }
                        }
                } while (avail <= 0);
 
                copyCount = copy_dac_from_user(s, buffer, count, avail);
                if (copyCount < 0) {
                        if (!ret) ret = -EFAULT;
                        return ret;
                }
 
                count -= copyCount;
                buffer += copyCount;
                ret += copyCount;
        } // while (count > 0)
 
        return ret;
}
 
/* No kernel lock - we have our own spinlock */
static unsigned int vrc5477_ac97_poll(struct file *file,
                                      struct poll_table_struct *wait)
{
        struct vrc5477_ac97_state *s = (struct vrc5477_ac97_state *)file->private_data;
        unsigned long flags;
        unsigned int mask = 0;
 
        if (file->f_mode & FMODE_WRITE)
                poll_wait(file, &s->dma_dac.wait, wait);
        if (file->f_mode & FMODE_READ)
                poll_wait(file, &s->dma_adc.wait, wait);
        spin_lock_irqsave(&s->lock, flags);
        if (file->f_mode & FMODE_READ) {
                if (s->dma_adc.count >= (signed)s->dma_adc.fragSize)
                        mask |= POLLIN | POLLRDNORM;
        }
        if (file->f_mode & FMODE_WRITE) {
                if ((signed)s->dma_dac.fragTotalSize >=
                    s->dma_dac.count + (signed)s->dma_dac.fragSize)
                        mask |= POLLOUT | POLLWRNORM;
        }
        spin_unlock_irqrestore(&s->lock, flags);
        return mask;
}
 
#ifdef VRC5477_AC97_DEBUG
static struct ioctl_str_t {
    unsigned int cmd;
    const char* str;
} ioctl_str[] = {
    {SNDCTL_DSP_RESET, "SNDCTL_DSP_RESET"},
    {SNDCTL_DSP_SYNC, "SNDCTL_DSP_SYNC"},
    {SNDCTL_DSP_SPEED, "SNDCTL_DSP_SPEED"},
    {SNDCTL_DSP_STEREO, "SNDCTL_DSP_STEREO"},
    {SNDCTL_DSP_GETBLKSIZE, "SNDCTL_DSP_GETBLKSIZE"},
    {SNDCTL_DSP_SETFMT, "SNDCTL_DSP_SETFMT"},
    {SNDCTL_DSP_SAMPLESIZE, "SNDCTL_DSP_SAMPLESIZE"},
    {SNDCTL_DSP_CHANNELS, "SNDCTL_DSP_CHANNELS"},
    {SOUND_PCM_WRITE_CHANNELS, "SOUND_PCM_WRITE_CHANNELS"},
    {SOUND_PCM_WRITE_FILTER, "SOUND_PCM_WRITE_FILTER"},
    {SNDCTL_DSP_POST, "SNDCTL_DSP_POST"},
    {SNDCTL_DSP_SUBDIVIDE, "SNDCTL_DSP_SUBDIVIDE"},
    {SNDCTL_DSP_SETFRAGMENT, "SNDCTL_DSP_SETFRAGMENT"},
    {SNDCTL_DSP_GETFMTS, "SNDCTL_DSP_GETFMTS"},
    {SNDCTL_DSP_GETOSPACE, "SNDCTL_DSP_GETOSPACE"},
    {SNDCTL_DSP_GETISPACE, "SNDCTL_DSP_GETISPACE"},
    {SNDCTL_DSP_NONBLOCK, "SNDCTL_DSP_NONBLOCK"},
    {SNDCTL_DSP_GETCAPS, "SNDCTL_DSP_GETCAPS"},
    {SNDCTL_DSP_GETTRIGGER, "SNDCTL_DSP_GETTRIGGER"},
    {SNDCTL_DSP_SETTRIGGER, "SNDCTL_DSP_SETTRIGGER"},
    {SNDCTL_DSP_GETIPTR, "SNDCTL_DSP_GETIPTR"},
    {SNDCTL_DSP_GETOPTR, "SNDCTL_DSP_GETOPTR"},
    {SNDCTL_DSP_MAPINBUF, "SNDCTL_DSP_MAPINBUF"},
    {SNDCTL_DSP_MAPOUTBUF, "SNDCTL_DSP_MAPOUTBUF"},
    {SNDCTL_DSP_SETSYNCRO, "SNDCTL_DSP_SETSYNCRO"},
    {SNDCTL_DSP_SETDUPLEX, "SNDCTL_DSP_SETDUPLEX"},
    {SNDCTL_DSP_GETODELAY, "SNDCTL_DSP_GETODELAY"},
    {SNDCTL_DSP_GETCHANNELMASK, "SNDCTL_DSP_GETCHANNELMASK"},
    {SNDCTL_DSP_BIND_CHANNEL, "SNDCTL_DSP_BIND_CHANNEL"},
    {OSS_GETVERSION, "OSS_GETVERSION"},
    {SOUND_PCM_READ_RATE, "SOUND_PCM_READ_RATE"},
    {SOUND_PCM_READ_CHANNELS, "SOUND_PCM_READ_CHANNELS"},
    {SOUND_PCM_READ_BITS, "SOUND_PCM_READ_BITS"},
    {SOUND_PCM_READ_FILTER, "SOUND_PCM_READ_FILTER"}
};
#endif    
 
static int vrc5477_ac97_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
        struct vrc5477_ac97_state *s = (struct vrc5477_ac97_state *)file->private_data;
        unsigned long flags;
        audio_buf_info abinfo;
        int count;
        int val, ret;
 
#ifdef VRC5477_AC97_DEBUG
        for (count=0; count<sizeof(ioctl_str)/sizeof(ioctl_str[0]); count++) {
                if (ioctl_str[count].cmd == cmd)
                        break;
        }
        if (count < sizeof(ioctl_str)/sizeof(ioctl_str[0]))
                printk(KERN_INFO PFX "ioctl %s\n", ioctl_str[count].str);
        else
                printk(KERN_INFO PFX "ioctl unknown, 0x%x\n", cmd);
#endif
 
        switch (cmd) {
        case OSS_GETVERSION:
                return put_user(SOUND_VERSION, (int *)arg);
 
        case SNDCTL_DSP_SYNC:
                if (file->f_mode & FMODE_WRITE)
                        return drain_dac(s, file->f_flags & O_NONBLOCK);
                return 0;
 
        case SNDCTL_DSP_SETDUPLEX:
                return 0;
 
        case SNDCTL_DSP_GETCAPS:
                return put_user(DSP_CAP_DUPLEX, (int *)arg);
 
        case SNDCTL_DSP_RESET:
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        synchronize_irq();
                        s->dma_dac.count = 0;
                        s->dma_dac.nextIn = s->dma_dac.nextOut = 0;
                }
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        synchronize_irq();
                        s->dma_adc.count = 0;
                        s->dma_adc.nextIn = s->dma_adc.nextOut = 0;
                }
                return 0;
 
        case SNDCTL_DSP_SPEED:
                if (get_user(val, (int *)arg))
                        return -EFAULT;
                if (val >= 0) {
                        if (file->f_mode & FMODE_READ) {
                                stop_adc(s);
                                set_adc_rate(s, val);
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        }
                        if (file->f_mode & FMODE_WRITE) {
                                stop_dac(s);
                                set_dac_rate(s, val);
                                if ((ret = prog_dmabuf_dac(s)))
                                        return ret;
                        }
                }
                return put_user((file->f_mode & FMODE_READ) ?
                                s->adcRate : s->dacRate, (int *)arg);
 
        case SNDCTL_DSP_STEREO:
                if (get_user(val, (int *)arg))
                        return -EFAULT;
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        if (val)
                                s->adcChannels = 2;
                        else
                                s->adcChannels = 1;
                        if ((ret = prog_dmabuf_adc(s)))
                                return ret;
                }
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        if (val)
                                s->dacChannels = 2;
                        else
                                s->dacChannels = 1;
                        if ((ret = prog_dmabuf_dac(s)))
                                return ret;
                }
                return 0;
 
        case SNDCTL_DSP_CHANNELS:
                if (get_user(val, (int *)arg))
                        return -EFAULT;
                if (val != 0) {
                        if ( (val != 1) && (val != 2)) val = 2;
 
                        if (file->f_mode & FMODE_READ) {
                                stop_adc(s);
                                s->dacChannels = val;
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        }
                        if (file->f_mode & FMODE_WRITE) {
                                stop_dac(s);
                                s->dacChannels = val;
                                if ((ret = prog_dmabuf_dac(s)))
                                        return ret;
                        }
                }
                return put_user(val, (int *)arg);
 
        case SNDCTL_DSP_GETFMTS: /* Returns a mask */
                return put_user(AFMT_S16_LE, (int *)arg);
 
        case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
                if (get_user(val, (int *)arg))
                        return -EFAULT;
                if (val != AFMT_QUERY) {
                        if (val != AFMT_S16_LE) return -EINVAL;
                        if (file->f_mode & FMODE_READ) {
                                stop_adc(s);
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        }
                        if (file->f_mode & FMODE_WRITE) {
                                stop_dac(s);
                                if ((ret = prog_dmabuf_dac(s)))
                                        return ret;
                        }
                } else {
                        val = AFMT_S16_LE;
                }
                return put_user(val, (int *)arg);
 
        case SNDCTL_DSP_POST:
                return 0;
 
        case SNDCTL_DSP_GETTRIGGER:
        case SNDCTL_DSP_SETTRIGGER:
                /* NO trigger */
                return -EINVAL;
 
        case SNDCTL_DSP_GETOSPACE:
                if (!(file->f_mode & FMODE_WRITE))
                        return -EINVAL;
                abinfo.fragsize = s->dma_dac.fragSize << (s->dacChannels-1);
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_dac.count;
                spin_unlock_irqrestore(&s->lock, flags);
                abinfo.bytes = (s->dma_dac.fragTotalSize - count) <<
                        (s->dacChannels-1);
                abinfo.fragstotal = s->dma_dac.numFrag;
                abinfo.fragments = abinfo.bytes >> s->dma_dac.fragShift >>
                        (s->dacChannels-1);
                return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
 
        case SNDCTL_DSP_GETISPACE:
                if (!(file->f_mode & FMODE_READ))
                        return -EINVAL;
                abinfo.fragsize = s->dma_adc.fragSize << (s->adcChannels-1);
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_adc.count;
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                abinfo.bytes = count << (s->adcChannels-1);
                abinfo.fragstotal = s->dma_adc.numFrag;
                abinfo.fragments = (abinfo.bytes >> s->dma_adc.fragShift) >>
                        (s->adcChannels-1);
                return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
 
        case SNDCTL_DSP_NONBLOCK:
                file->f_flags |= O_NONBLOCK;
                return 0;
 
        case SNDCTL_DSP_GETODELAY:
                if (!(file->f_mode & FMODE_WRITE))
                        return -EINVAL;
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_dac.count;
                spin_unlock_irqrestore(&s->lock, flags);
                return put_user(count, (int *)arg);
 
        case SNDCTL_DSP_GETIPTR:
        case SNDCTL_DSP_GETOPTR:
                /* we cannot get DMA ptr */
                return -EINVAL;
 
        case SNDCTL_DSP_GETBLKSIZE:
                if (file->f_mode & FMODE_WRITE)
                        return put_user(s->dma_dac.fragSize << (s->dacChannels-1), (int *)arg);
                else
                        return put_user(s->dma_adc.fragSize << (s->adcChannels-1), (int *)arg);
 
        case SNDCTL_DSP_SETFRAGMENT:
                /* we ignore fragment size request */
                return 0;
 
        case SNDCTL_DSP_SUBDIVIDE:
                /* what is this for? [jsun] */
                return 0;
 
        case SOUND_PCM_READ_RATE:
                return put_user((file->f_mode & FMODE_READ) ?
                                s->adcRate : s->dacRate, (int *)arg);
 
        case SOUND_PCM_READ_CHANNELS:
                if (file->f_mode & FMODE_READ)
                        return put_user(s->adcChannels, (int *)arg);
                else
                        return put_user(s->dacChannels ? 2 : 1, (int *)arg);
 
        case SOUND_PCM_READ_BITS:
                return put_user(16, (int *)arg);
 
        case SOUND_PCM_WRITE_FILTER:
        case SNDCTL_DSP_SETSYNCRO:
        case SOUND_PCM_READ_FILTER:
                return -EINVAL;
        }
 
        return mixdev_ioctl(s->codec, cmd, arg);
}
 
 
static int vrc5477_ac97_open(struct inode *inode, struct file *file)
{
        int minor = MINOR(inode->i_rdev);
        DECLARE_WAITQUEUE(wait, current);
        unsigned long flags;
        struct list_head *list;
        struct vrc5477_ac97_state *s;
        int ret=0;
 
        for (list = devs.next; ; list = list->next) {
                if (list == &devs)
                        return -ENODEV;
                s = list_entry(list, struct vrc5477_ac97_state, devs);
                if (!((s->dev_audio ^ minor) & ~0xf))
                        break;
        }
        file->private_data = s;
 
        /* wait for device to become free */
        down(&s->open_sem);
        while (s->open_mode & file->f_mode) {
 
                if (file->f_flags & O_NONBLOCK) {
                        up(&s->open_sem);
                        return -EBUSY;
                }
                add_wait_queue(&s->open_wait, &wait);
                __set_current_state(TASK_INTERRUPTIBLE);
                up(&s->open_sem);
                schedule();
                remove_wait_queue(&s->open_wait, &wait);
                set_current_state(TASK_RUNNING);
                if (signal_pending(current))
                        return -ERESTARTSYS;
                down(&s->open_sem);
        }
 
        spin_lock_irqsave(&s->lock, flags);
 
        if (file->f_mode & FMODE_READ) {
                /* set default settings */
                set_adc_rate(s, 48000);
                s->adcChannels = 2;
 
                ret = prog_dmabuf_adc(s);
                if (ret) goto bailout;
        }
        if (file->f_mode & FMODE_WRITE) {
                /* set default settings */
                set_dac_rate(s, 48000);
                s->dacChannels = 2;
 
                ret = prog_dmabuf_dac(s);
                if (ret) goto bailout;
        }
 
        s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
 
 bailout:
        spin_unlock_irqrestore(&s->lock, flags);
 
        up(&s->open_sem);
        return ret;
}
 
static int vrc5477_ac97_release(struct inode *inode, struct file *file)
{
        struct vrc5477_ac97_state *s =
                (struct vrc5477_ac97_state *)file->private_data;
 
        lock_kernel();
        if (file->f_mode & FMODE_WRITE)
                drain_dac(s, file->f_flags & O_NONBLOCK);
        down(&s->open_sem);
        if (file->f_mode & FMODE_WRITE) {
                stop_dac(s);
                dealloc_dmabuf(s, &s->dma_dac);
        }
        if (file->f_mode & FMODE_READ) {
                stop_adc(s);
                dealloc_dmabuf(s, &s->dma_adc);
        }
        s->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
        up(&s->open_sem);
        wake_up(&s->open_wait);
        unlock_kernel();
        return 0;
}
 
static /*const*/ struct file_operations vrc5477_ac97_audio_fops = {
        owner:  THIS_MODULE,
        llseek:         no_llseek,
        read:           vrc5477_ac97_read,
        write:          vrc5477_ac97_write,
        poll:           vrc5477_ac97_poll,
        ioctl:          vrc5477_ac97_ioctl,
        // mmap:        vrc5477_ac97_mmap,
        open:           vrc5477_ac97_open,
        release:        vrc5477_ac97_release,
};
 
 
/* --------------------------------------------------------------------- */
 
 
/* --------------------------------------------------------------------- */
 
/*
 * for debugging purposes, we'll create a proc device that dumps the
 * CODEC chipstate
 */
 
#ifdef VRC5477_AC97_DEBUG
 
struct {
       const char *regname;
       unsigned regaddr;
} vrc5477_ac97_regs[] = {
        {"VRC5477_INT_STATUS", VRC5477_INT_STATUS},
        {"VRC5477_CODEC_WR", VRC5477_CODEC_WR},
        {"VRC5477_CODEC_RD", VRC5477_CODEC_RD},
        {"VRC5477_CTRL", VRC5477_CTRL},
        {"VRC5477_ACLINK_CTRL", VRC5477_ACLINK_CTRL},
        {"VRC5477_INT_MASK", VRC5477_INT_MASK},
        {"VRC5477_DAC1_CTRL", VRC5477_DAC1_CTRL},
        {"VRC5477_DAC1L", VRC5477_DAC1L},
        {"VRC5477_DAC1_BADDR", VRC5477_DAC1_BADDR},
        {"VRC5477_DAC2_CTRL", VRC5477_DAC2_CTRL},
        {"VRC5477_DAC2L", VRC5477_DAC2L},
        {"VRC5477_DAC2_BADDR", VRC5477_DAC2_BADDR},
        {"VRC5477_DAC3_CTRL", VRC5477_DAC3_CTRL},
        {"VRC5477_DAC3L", VRC5477_DAC3L},
        {"VRC5477_DAC3_BADDR", VRC5477_DAC3_BADDR},
        {"VRC5477_ADC1_CTRL", VRC5477_ADC1_CTRL},
        {"VRC5477_ADC1L", VRC5477_ADC1L},
        {"VRC5477_ADC1_BADDR", VRC5477_ADC1_BADDR},
        {"VRC5477_ADC2_CTRL", VRC5477_ADC2_CTRL},
        {"VRC5477_ADC2L", VRC5477_ADC2L},
        {"VRC5477_ADC2_BADDR", VRC5477_ADC2_BADDR},
        {"VRC5477_ADC3_CTRL", VRC5477_ADC3_CTRL},
        {"VRC5477_ADC3L", VRC5477_ADC3L},
        {"VRC5477_ADC3_BADDR", VRC5477_ADC3_BADDR},
        {NULL, 0x0}
};
 
static int proc_vrc5477_ac97_dump (char *buf, char **start, off_t fpos,
                                   int length, int *eof, void *data)
{
        struct vrc5477_ac97_state *s;
        int cnt, len = 0;
 
        if (list_empty(&devs))
                return 0;
        s = list_entry(devs.next, struct vrc5477_ac97_state, devs);
 
        /* print out header */
        len += sprintf(buf + len, "\n\t\tVrc5477 Audio Debug\n\n");
 
        // print out digital controller state
        len += sprintf (buf + len, "NEC Vrc5477 Audio Controller registers\n");
        len += sprintf (buf + len, "---------------------------------\n");
        for (cnt=0; vrc5477_ac97_regs[cnt].regname != NULL; cnt++) {
                len+= sprintf (buf + len, "%-20s = %08x\n",
                               vrc5477_ac97_regs[cnt].regname,
                               inl(s->io + vrc5477_ac97_regs[cnt].regaddr));
        }
 
        /* print out driver state */
        len += sprintf (buf + len, "NEC Vrc5477 Audio driver states\n");
        len += sprintf (buf + len, "---------------------------------\n");
        len += sprintf (buf + len, "dacChannels  = %d\n", s->dacChannels);
        len += sprintf (buf + len, "adcChannels  = %d\n", s->adcChannels);
        len += sprintf (buf + len, "dacRate  = %d\n", s->dacRate);
        len += sprintf (buf + len, "adcRate  = %d\n", s->adcRate);
 
        len += sprintf (buf + len, "dma_dac is %s ready\n",
                        s->dma_dac.ready? "" : "not");
        if (s->dma_dac.ready) {
                len += sprintf (buf + len, "dma_dac is %s stopped.\n",
                                s->dma_dac.stopped? "" : "not");
                len += sprintf (buf + len, "dma_dac.fragSize = %x\n",
                                s->dma_dac.fragSize);
                len += sprintf (buf + len, "dma_dac.fragShift = %x\n",
                                s->dma_dac.fragShift);
                len += sprintf (buf + len, "dma_dac.numFrag = %x\n",
                                s->dma_dac.numFrag);
                len += sprintf (buf + len, "dma_dac.fragTotalSize = %x\n",
                                s->dma_dac.fragTotalSize);
                len += sprintf (buf + len, "dma_dac.nextIn = %x\n",
                                s->dma_dac.nextIn);
                len += sprintf (buf + len, "dma_dac.nextOut = %x\n",
                                s->dma_dac.nextOut);
                len += sprintf (buf + len, "dma_dac.count = %x\n",
                                s->dma_dac.count);
        }
 
        len += sprintf (buf + len, "dma_adc is %s ready\n",
                        s->dma_adc.ready? "" : "not");
        if (s->dma_adc.ready) {
                len += sprintf (buf + len, "dma_adc is %s stopped.\n",
                                s->dma_adc.stopped? "" : "not");
                len += sprintf (buf + len, "dma_adc.fragSize = %x\n",
                                s->dma_adc.fragSize);
                len += sprintf (buf + len, "dma_adc.fragShift = %x\n",
                                s->dma_adc.fragShift);
                len += sprintf (buf + len, "dma_adc.numFrag = %x\n",
                                s->dma_adc.numFrag);
                len += sprintf (buf + len, "dma_adc.fragTotalSize = %x\n",
                                s->dma_adc.fragTotalSize);
                len += sprintf (buf + len, "dma_adc.nextIn = %x\n",
                                s->dma_adc.nextIn);
                len += sprintf (buf + len, "dma_adc.nextOut = %x\n",
                                s->dma_adc.nextOut);
                len += sprintf (buf + len, "dma_adc.count = %x\n",
                                s->dma_adc.count);
        }
 
        /* print out CODEC state */
        len += sprintf (buf + len, "\nAC97 CODEC registers\n");
        len += sprintf (buf + len, "----------------------\n");
        for (cnt=0; cnt <= 0x7e; cnt = cnt +2)
                len+= sprintf (buf + len, "reg %02x = %04x\n",
                               cnt, rdcodec(s->codec, cnt));
 
        if (fpos >=len){
                *start = buf;
                *eof =1;
                return 0;
        }
        *start = buf + fpos;
        if ((len -= fpos) > length)
                return length;
        *eof =1;
        return len;
 
}
#endif /* VRC5477_AC97_DEBUG */
 
/* --------------------------------------------------------------------- */
 
/* maximum number of devices; only used for command line params */
#define NR_DEVICE 5
 
static unsigned int devindex = 0;
 
MODULE_AUTHOR("Monta Vista Software, jsun@mvista.com or jsun@junsun.net");
MODULE_DESCRIPTION("NEC Vrc5477 audio (AC97) Driver");
MODULE_LICENSE("GPL");
 
static int __devinit vrc5477_ac97_probe(struct pci_dev *pcidev,
                                        const struct pci_device_id *pciid)
{
        struct vrc5477_ac97_state *s;
#ifdef VRC5477_AC97_DEBUG
        char proc_str[80];
#endif
 
        if (pcidev->irq == 0)
                return -1;
 
        if (!(s = kmalloc(sizeof(struct vrc5477_ac97_state), GFP_KERNEL))) {
                printk(KERN_ERR PFX "alloc of device struct failed\n");
                return -1;
        }
        memset(s, 0, sizeof(struct vrc5477_ac97_state));
 
        init_waitqueue_head(&s->dma_adc.wait);
        init_waitqueue_head(&s->dma_dac.wait);
        init_waitqueue_head(&s->open_wait);
        init_MUTEX(&s->open_sem);
        spin_lock_init(&s->lock);
 
        s->dev = pcidev;
        s->io = pci_resource_start(pcidev, 0);
        s->irq = pcidev->irq;
 
        s->codec = ac97_alloc_codec();
 
        s->codec->private_data = s;
        s->codec->id = 0;
        s->codec->codec_read = rdcodec;
        s->codec->codec_write = wrcodec;
        s->codec->codec_wait = waitcodec;
 
        /* setting some other default values such as
         * adcChannels, adcRate is done in open() so that
         * no persistent state across file opens.
         */
 
        /* test if get response from ac97, if not return */
        if (ac97_codec_not_present(s->codec)) {
                printk(KERN_ERR PFX "no ac97 codec\n");
                goto err_region;
 
        }
 
        if (!request_region(s->io, pci_resource_len(pcidev,0),
                            VRC5477_AC97_MODULE_NAME)) {
                printk(KERN_ERR PFX "io ports %#lx->%#lx in use\n",
                       s->io, s->io + pci_resource_len(pcidev,0)-1);
                goto err_region;
        }
        if (request_irq(s->irq, vrc5477_ac97_interrupt, SA_INTERRUPT,
                        VRC5477_AC97_MODULE_NAME, s)) {
                printk(KERN_ERR PFX "irq %u in use\n", s->irq);
                goto err_irq;
        }
 
        printk(KERN_INFO PFX "IO at %#lx, IRQ %d\n", s->io, s->irq);
 
        /* register devices */
        if ((s->dev_audio = register_sound_dsp(&vrc5477_ac97_audio_fops, -1)) < 0)
                goto err_dev1;
        if ((s->codec->dev_mixer =
             register_sound_mixer(&vrc5477_ac97_mixer_fops, -1)) < 0)
                goto err_dev2;
 
#ifdef VRC5477_AC97_DEBUG
        /* intialize the debug proc device */
        s->ps = create_proc_read_entry(VRC5477_AC97_MODULE_NAME, 0, NULL,
                                       proc_vrc5477_ac97_dump, NULL);
#endif /* VRC5477_AC97_DEBUG */
 
        /* enable pci io and bus mastering */
        if (pci_enable_device(pcidev))
                goto err_dev3;
        pci_set_master(pcidev);
 
        /* cold reset the AC97 */
        outl(VRC5477_ACLINK_CTRL_RST_ON | VRC5477_ACLINK_CTRL_RST_TIME,
             s->io + VRC5477_ACLINK_CTRL);
        while (inl(s->io + VRC5477_ACLINK_CTRL) & VRC5477_ACLINK_CTRL_RST_ON);
 
        /* codec init */
        if (!ac97_probe_codec(s->codec))
                goto err_dev3;
 
#ifdef VRC5477_AC97_DEBUG
        sprintf(proc_str, "driver/%s/%d/ac97",
                VRC5477_AC97_MODULE_NAME, s->codec->id);
        s->ac97_ps = create_proc_read_entry (proc_str, 0, NULL,
                                             ac97_read_proc, s->codec);
        /* TODO : why this proc file does not show up? */
#endif
 
        /* Try to enable variable rate audio mode. */
        wrcodec(s->codec, AC97_EXTENDED_STATUS,
                rdcodec(s->codec, AC97_EXTENDED_STATUS) | AC97_EXTSTAT_VRA);
        /* Did we enable it? */
        if(rdcodec(s->codec, AC97_EXTENDED_STATUS) & AC97_EXTSTAT_VRA)
                s->extended_status |= AC97_EXTSTAT_VRA;
        else {
                s->dacRate = 48000;
                printk(KERN_INFO PFX "VRA mode not enabled; rate fixed at %d.",
                        s->dacRate);
        }
 
        /* let us get the default volumne louder */
        wrcodec(s->codec, 0x2, 0x1010); /* master volume, middle */
        wrcodec(s->codec, 0xc, 0x10);           /* phone volume, middle */
        // wrcodec(s->codec, 0xe, 0x10);                /* misc volume, middle */
        wrcodec(s->codec, 0x10, 0x8000);        /* line-in 2 line-out disable */
        wrcodec(s->codec, 0x18, 0x0707);        /* PCM out (line out) middle */
 
 
        /* by default we select line in the input */
        wrcodec(s->codec, 0x1a, 0x0404);
        wrcodec(s->codec, 0x1c, 0x0f0f);
        wrcodec(s->codec, 0x1e, 0x07);
 
        /* enable the master interrupt but disable all others */
        outl(VRC5477_INT_MASK_NMASK, s->io + VRC5477_INT_MASK);
 
        /* store it in the driver field */
        pci_set_drvdata(pcidev, s);
        pcidev->dma_mask = 0xffffffff;
        /* put it into driver list */
        list_add_tail(&s->devs, &devs);
        /* increment devindex */
        if (devindex < NR_DEVICE-1)
                devindex++;
        return 0;
 
 err_dev3:
        unregister_sound_mixer(s->codec->dev_mixer);
 err_dev2:
        unregister_sound_dsp(s->dev_audio);
 err_dev1:
        printk(KERN_ERR PFX "cannot register misc device\n");
        free_irq(s->irq, s);
 err_irq:
        release_region(s->io, pci_resource_len(pcidev,0));
 err_region:
        ac97_release_codec(codec);
        kfree(s);
        return -1;
}
 
static void __devexit vrc5477_ac97_remove(struct pci_dev *dev)
{
        struct vrc5477_ac97_state *s = pci_get_drvdata(dev);
 
        if (!s)
                return;
        list_del(&s->devs);
 
#ifdef VRC5477_AC97_DEBUG
        if (s->ps)
                remove_proc_entry(VRC5477_AC97_MODULE_NAME, NULL);
#endif /* VRC5477_AC97_DEBUG */
 
        synchronize_irq();
        free_irq(s->irq, s);
        release_region(s->io, pci_resource_len(dev,0));
        unregister_sound_dsp(s->dev_audio);
        unregister_sound_mixer(s->codec->dev_mixer);
        ac97_release_codec(s->codec);
        kfree(s);
        pci_set_drvdata(dev, NULL);
}
 
 
static struct pci_device_id id_table[] __devinitdata = {
    { PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_VRC5477_AC97,
      PCI_ANY_ID, PCI_ANY_ID, 0, 0 },
    { 0, }
};
 
MODULE_DEVICE_TABLE(pci, id_table);
 
static struct pci_driver vrc5477_ac97_driver = {
        name: VRC5477_AC97_MODULE_NAME,
        id_table: id_table,
        probe: vrc5477_ac97_probe,
        remove: __devexit_p(vrc5477_ac97_remove)
};
 
static int __init init_vrc5477_ac97(void)
{
        if (!pci_present())   /* No PCI bus in this machine! */
                return -ENODEV;
        printk("Vrc5477 AC97 driver: version v0.2 time " __TIME__ " " __DATE__ " by Jun Sun\n");
        return pci_module_init(&vrc5477_ac97_driver);
}
 
static void __exit cleanup_vrc5477_ac97(void)
{
        printk(KERN_INFO PFX "unloading\n");
        pci_unregister_driver(&vrc5477_ac97_driver);
}
 
module_init(init_vrc5477_ac97);
module_exit(cleanup_vrc5477_ac97);
 
Browse

Tools

Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [sound/] [nec_vrc5477.c] - Blame information for rev 1780

Line No.	Rev	Author	Line
1	1275	phoenix	`/***********************************************************************`
2			`* Copyright 2001 MontaVista Software Inc.`
3			`* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net`
4			`*`
5			`* drivers/sound/nec_vrc5477.c`
6			`* AC97 sound dirver for NEC Vrc5477 chip (an integrated,`
7			`* multi-function controller chip for MIPS CPUs)`
8			`*`
9			`* VRA support Copyright 2001 Bradley D. LaRonde <brad@ltc.com>`
10			`*`
11			`* This program is free software; you can redistribute it and/or modify it`
12			`* under the terms of the GNU General Public License as published by the`
13			`* Free Software Foundation; either version 2 of the License, or (at your`
14			`* option) any later version.`
15			`***********************************************************************`
16			`*/`
17
18			`/*`
19			`* This code is derived from ite8172.c, which is written by Steve Longerbeam.`
20			`*`
21			`* Features:`
22			`* Currently we only support the following capabilities:`
23			`* . mono output to PCM L/R (line out).`
24			`* . stereo output to PCM L/R (line out).`
25			`* . mono input from PCM L (line in).`
26			`* . stereo output from PCM (line in).`
27			`* . sampling rate at 48k or variable sampling rate`
28			`* . support /dev/dsp, /dev/mixer devices, standard OSS devices.`
29			`* . only support 16-bit PCM format (hardware limit, no software`
30			`* translation)`
31			`* . support duplex, but no trigger or realtime.`
32			`*`
33			`* Specifically the following are not supported:`
34			`* . app-set frag size.`
35			`* . mmap'ed buffer access`
36			`*/`
37
38			`/*`
39			`* Original comments from ite8172.c file.`
40			`*/`