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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [sound/] [oss/] [au1550_ac97.c] - Blame information for rev 3

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/*
 * au1550_ac97.c  --  Sound driver for Alchemy Au1550 MIPS Internet Edge
 *                    Processor.
 *
 * Copyright 2004 Embedded Edge, LLC
 *      dan@embeddededge.com
 *
 * Mostly copied from the au1000.c driver and some from the
 * PowerMac dbdma driver.
 * We assume the processor can do memory coherent DMA.
 *
 * Ported to 2.6 by Matt Porter <mporter@kernel.crashing.org>
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
 
#undef DEBUG
 
#include <linux/module.h>
#include <linux/string.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/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/bitops.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/mutex.h>
 
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <asm/mach-au1x00/au1xxx_psc.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
#include <asm/mach-au1x00/au1xxx.h>
 
#undef OSS_DOCUMENTED_MIXER_SEMANTICS
 
/* misc stuff */
#define POLL_COUNT   0x50000
#define AC97_EXT_DACS (AC97_EXTID_SDAC | AC97_EXTID_CDAC | AC97_EXTID_LDAC)
 
/* The number of DBDMA ring descriptors to allocate.  No sense making
 * this too large....if you can't keep up with a few you aren't likely
 * to be able to with lots of them, either.
 */
#define NUM_DBDMA_DESCRIPTORS 4
 
#define err(format, arg...) printk(KERN_ERR format "\n" , ## arg)
 
/* Boot options
 * 0 = no VRA, 1 = use VRA if codec supports it
 */
static int      vra = 1;
module_param(vra, bool, 0);
MODULE_PARM_DESC(vra, "if 1 use VRA if codec supports it");
 
static struct au1550_state {
        /* soundcore stuff */
        int             dev_audio;
 
        struct ac97_codec *codec;
        unsigned        codec_base_caps; /* AC'97 reg 00h, "Reset Register" */
        unsigned        codec_ext_caps;  /* AC'97 reg 28h, "Extended Audio ID" */
        int             no_vra;         /* do not use VRA */
 
        spinlock_t      lock;
        struct mutex open_mutex;
        struct mutex sem;
        mode_t          open_mode;
        wait_queue_head_t open_wait;
 
        struct dmabuf {
                u32             dmanr;
                unsigned        sample_rate;
                unsigned        src_factor;
                unsigned        sample_size;
                int             num_channels;
                int             dma_bytes_per_sample;
                int             user_bytes_per_sample;
                int             cnt_factor;
 
                void            *rawbuf;
                unsigned        buforder;
                unsigned        numfrag;
                unsigned        fragshift;
                void            *nextIn;
                void            *nextOut;
                int             count;
                unsigned        total_bytes;
                unsigned        error;
                wait_queue_head_t wait;
 
                /* redundant, but makes calculations easier */
                unsigned        fragsize;
                unsigned        dma_fragsize;
                unsigned        dmasize;
                unsigned        dma_qcount;
 
                /* OSS stuff */
                unsigned        mapped:1;
                unsigned        ready:1;
                unsigned        stopped:1;
                unsigned        ossfragshift;
                int             ossmaxfrags;
                unsigned        subdivision;
        } dma_dac, dma_adc;
} au1550_state;
 
static 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 void
au1550_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 u16
rdcodec(struct ac97_codec *codec, u8 addr)
{
        struct au1550_state *s = (struct au1550_state *)codec->private_data;
        unsigned long   flags;
        u32             cmd, val;
        u16             data;
        int             i;
 
        spin_lock_irqsave(&s->lock, flags);
 
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97STAT);
                au_sync();
                if (!(val & PSC_AC97STAT_CP))
                        break;
        }
        if (i == POLL_COUNT)
                err("rdcodec: codec cmd pending expired!");
 
        cmd = (u32)PSC_AC97CDC_INDX(addr);
        cmd |= PSC_AC97CDC_RD;  /* read command */
        au_writel(cmd, PSC_AC97CDC);
        au_sync();
 
        /* now wait for the data
        */
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97STAT);
                au_sync();
                if (!(val & PSC_AC97STAT_CP))
                        break;
        }
        if (i == POLL_COUNT) {
                err("rdcodec: read poll expired!");
                data = 0;
                goto out;
        }
 
        /* wait for command done?
        */
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97EVNT);
                au_sync();
                if (val & PSC_AC97EVNT_CD)
                        break;
        }
        if (i == POLL_COUNT) {
                err("rdcodec: read cmdwait expired!");
                data = 0;
                goto out;
        }
 
        data = au_readl(PSC_AC97CDC) & 0xffff;
        au_sync();
 
        /* Clear command done event.
        */
        au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT);
        au_sync();
 
 out:
        spin_unlock_irqrestore(&s->lock, flags);
 
        return data;
}
 
 
static void
wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
{
        struct au1550_state *s = (struct au1550_state *)codec->private_data;
        unsigned long   flags;
        u32             cmd, val;
        int             i;
 
        spin_lock_irqsave(&s->lock, flags);
 
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97STAT);
                au_sync();
                if (!(val & PSC_AC97STAT_CP))
                        break;
        }
        if (i == POLL_COUNT)
                err("wrcodec: codec cmd pending expired!");
 
        cmd = (u32)PSC_AC97CDC_INDX(addr);
        cmd |= (u32)data;
        au_writel(cmd, PSC_AC97CDC);
        au_sync();
 
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97STAT);
                au_sync();
                if (!(val & PSC_AC97STAT_CP))
                        break;
        }
        if (i == POLL_COUNT)
                err("wrcodec: codec cmd pending expired!");
 
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97EVNT);
                au_sync();
                if (val & PSC_AC97EVNT_CD)
                        break;
        }
        if (i == POLL_COUNT)
                err("wrcodec: read cmdwait expired!");
 
        /* Clear command done event.
        */
        au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT);
        au_sync();
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
static void
waitcodec(struct ac97_codec *codec)
{
        u16     temp;
        u32     val;
        int     i;
 
        /* codec_wait is used to wait for a ready state after
         * an AC97C_RESET.
         */
        au1550_delay(10);
 
        /* first poll the CODEC_READY tag bit
        */
        for (i = 0; i < POLL_COUNT; i++) {
                val = au_readl(PSC_AC97STAT);
                au_sync();
                if (val & PSC_AC97STAT_CR)
                        break;
        }
        if (i == POLL_COUNT) {
                err("waitcodec: CODEC_READY poll expired!");
                return;
        }
 
        /* get AC'97 powerdown control/status register
        */
        temp = rdcodec(codec, AC97_POWER_CONTROL);
 
        /* If anything is powered down, power'em up
        */
        if (temp & 0x7f00) {
                /* Power on
                */
                wrcodec(codec, AC97_POWER_CONTROL, 0);
                au1550_delay(100);
 
                /* Reread
                */
                temp = rdcodec(codec, AC97_POWER_CONTROL);
        }
 
        /* Check if Codec REF,ANL,DAC,ADC ready
        */
        if ((temp & 0x7f0f) != 0x000f)
                err("codec reg 26 status (0x%x) not ready!!", temp);
}
 
/* stop the ADC before calling */
static void
set_adc_rate(struct au1550_state *s, unsigned rate)
{
        struct dmabuf  *adc = &s->dma_adc;
        struct dmabuf  *dac = &s->dma_dac;
        unsigned        adc_rate, dac_rate;
        u16             ac97_extstat;
 
        if (s->no_vra) {
                /* calc SRC factor
                */
                adc->src_factor = ((96000 / rate) + 1) >> 1;
                adc->sample_rate = 48000 / adc->src_factor;
                return;
        }
 
        adc->src_factor = 1;
 
        ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
 
        rate = rate > 48000 ? 48000 : rate;
 
        /* enable VRA
        */
        wrcodec(s->codec, AC97_EXTENDED_STATUS,
                ac97_extstat | AC97_EXTSTAT_VRA);
 
        /* now write the sample rate
        */
        wrcodec(s->codec, AC97_PCM_LR_ADC_RATE, (u16) rate);
 
        /* read it back for actual supported rate
        */
        adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE);
 
        pr_debug("set_adc_rate: set to %d Hz\n", adc_rate);
 
        /* some codec's don't allow unequal DAC and ADC rates, in which case
         * writing one rate reg actually changes both.
         */
        dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE);
        if (dac->num_channels > 2)
                wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, dac_rate);
        if (dac->num_channels > 4)
                wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, dac_rate);
 
        adc->sample_rate = adc_rate;
        dac->sample_rate = dac_rate;
}
 
/* stop the DAC before calling */
static void
set_dac_rate(struct au1550_state *s, unsigned rate)
{
        struct dmabuf  *dac = &s->dma_dac;
        struct dmabuf  *adc = &s->dma_adc;
        unsigned        adc_rate, dac_rate;
        u16             ac97_extstat;
 
        if (s->no_vra) {
                /* calc SRC factor
                */
                dac->src_factor = ((96000 / rate) + 1) >> 1;
                dac->sample_rate = 48000 / dac->src_factor;
                return;
        }
 
        dac->src_factor = 1;
 
        ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
 
        rate = rate > 48000 ? 48000 : rate;
 
        /* enable VRA
        */
        wrcodec(s->codec, AC97_EXTENDED_STATUS,
                ac97_extstat | AC97_EXTSTAT_VRA);
 
        /* now write the sample rate
        */
        wrcodec(s->codec, AC97_PCM_FRONT_DAC_RATE, (u16) rate);
 
        /* I don't support different sample rates for multichannel,
         * so make these channels the same.
         */
        if (dac->num_channels > 2)
                wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, (u16) rate);
        if (dac->num_channels > 4)
                wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, (u16) rate);
        /* read it back for actual supported rate
        */
        dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE);
 
        pr_debug("set_dac_rate: set to %d Hz\n", dac_rate);
 
        /* some codec's don't allow unequal DAC and ADC rates, in which case
         * writing one rate reg actually changes both.
         */
        adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE);
 
        dac->sample_rate = dac_rate;
        adc->sample_rate = adc_rate;
}
 
static void
stop_dac(struct au1550_state *s)
{
        struct dmabuf  *db = &s->dma_dac;
        u32             stat;
        unsigned long   flags;
 
        if (db->stopped)
                return;
 
        spin_lock_irqsave(&s->lock, flags);
 
        au_writel(PSC_AC97PCR_TP, PSC_AC97PCR);
        au_sync();
 
        /* Wait for Transmit Busy to show disabled.
        */
        do {
                stat = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((stat & PSC_AC97STAT_TB) != 0);
 
        au1xxx_dbdma_reset(db->dmanr);
 
        db->stopped = 1;
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
static void
stop_adc(struct au1550_state *s)
{
        struct dmabuf  *db = &s->dma_adc;
        unsigned long   flags;
        u32             stat;
 
        if (db->stopped)
                return;
 
        spin_lock_irqsave(&s->lock, flags);
 
        au_writel(PSC_AC97PCR_RP, PSC_AC97PCR);
        au_sync();
 
        /* Wait for Receive Busy to show disabled.
        */
        do {
                stat = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((stat & PSC_AC97STAT_RB) != 0);
 
        au1xxx_dbdma_reset(db->dmanr);
 
        db->stopped = 1;
 
        spin_unlock_irqrestore(&s->lock, flags);
}
 
 
static void
set_xmit_slots(int num_channels)
{
        u32     ac97_config, stat;
 
        ac97_config = au_readl(PSC_AC97CFG);
        au_sync();
        ac97_config &= ~(PSC_AC97CFG_TXSLOT_MASK | PSC_AC97CFG_DE_ENABLE);
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        switch (num_channels) {
        case 6:         /* stereo with surround and center/LFE,
                         * slots 3,4,6,7,8,9
                         */
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(6);
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(9);
 
        case 4:         /* stereo with surround, slots 3,4,7,8 */
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(7);
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(8);
 
        case 2:         /* stereo, slots 3,4 */
        case 1:         /* mono */
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(3);
                ac97_config |= PSC_AC97CFG_TXSLOT_ENA(4);
        }
 
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        ac97_config |= PSC_AC97CFG_DE_ENABLE;
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        /* Wait for Device ready.
        */
        do {
                stat = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((stat & PSC_AC97STAT_DR) == 0);
}
 
static void
set_recv_slots(int num_channels)
{
        u32     ac97_config, stat;
 
        ac97_config = au_readl(PSC_AC97CFG);
        au_sync();
        ac97_config &= ~(PSC_AC97CFG_RXSLOT_MASK | PSC_AC97CFG_DE_ENABLE);
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        /* Always enable slots 3 and 4 (stereo). Slot 6 is
         * optional Mic ADC, which we don't support yet.
         */
        ac97_config |= PSC_AC97CFG_RXSLOT_ENA(3);
        ac97_config |= PSC_AC97CFG_RXSLOT_ENA(4);
 
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        ac97_config |= PSC_AC97CFG_DE_ENABLE;
        au_writel(ac97_config, PSC_AC97CFG);
        au_sync();
 
        /* Wait for Device ready.
        */
        do {
                stat = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((stat & PSC_AC97STAT_DR) == 0);
}
 
/* Hold spinlock for both start_dac() and start_adc() calls */
static void
start_dac(struct au1550_state *s)
{
        struct dmabuf  *db = &s->dma_dac;
 
        if (!db->stopped)
                return;
 
        set_xmit_slots(db->num_channels);
        au_writel(PSC_AC97PCR_TC, PSC_AC97PCR);
        au_sync();
        au_writel(PSC_AC97PCR_TS, PSC_AC97PCR);
        au_sync();
 
        au1xxx_dbdma_start(db->dmanr);
 
        db->stopped = 0;
}
 
static void
start_adc(struct au1550_state *s)
{
        struct dmabuf  *db = &s->dma_adc;
        int     i;
 
        if (!db->stopped)
                return;
 
        /* Put two buffers on the ring to get things started.
        */
        for (i=0; i<2; i++) {
                au1xxx_dbdma_put_dest(db->dmanr, db->nextIn, db->dma_fragsize);
 
                db->nextIn += db->dma_fragsize;
                if (db->nextIn >= db->rawbuf + db->dmasize)
                        db->nextIn -= db->dmasize;
        }
 
        set_recv_slots(db->num_channels);
        au1xxx_dbdma_start(db->dmanr);
        au_writel(PSC_AC97PCR_RC, PSC_AC97PCR);
        au_sync();
        au_writel(PSC_AC97PCR_RS, PSC_AC97PCR);
        au_sync();
 
        db->stopped = 0;
}
 
static int
prog_dmabuf(struct au1550_state *s, struct dmabuf *db)
{
        unsigned user_bytes_per_sec;
        unsigned        bufs;
        unsigned        rate = db->sample_rate;
 
        if (!db->rawbuf) {
                db->ready = db->mapped = 0;
                db->buforder = 5;       /* 32 * PAGE_SIZE */
                db->rawbuf = kmalloc((PAGE_SIZE << db->buforder), GFP_KERNEL);
                if (!db->rawbuf)
                        return -ENOMEM;
        }
 
        db->cnt_factor = 1;
        if (db->sample_size == 8)
                db->cnt_factor *= 2;
        if (db->num_channels == 1)
                db->cnt_factor *= 2;
        db->cnt_factor *= db->src_factor;
 
        db->count = 0;
        db->dma_qcount = 0;
        db->nextIn = db->nextOut = db->rawbuf;
 
        db->user_bytes_per_sample = (db->sample_size>>3) * db->num_channels;
        db->dma_bytes_per_sample = 2 * ((db->num_channels == 1) ?
                                        2 : db->num_channels);
 
        user_bytes_per_sec = rate * db->user_bytes_per_sample;
        bufs = PAGE_SIZE << db->buforder;
        if (db->ossfragshift) {
                if ((1000 << db->ossfragshift) < user_bytes_per_sec)
                        db->fragshift = ld2(user_bytes_per_sec/1000);
                else
                        db->fragshift = db->ossfragshift;
        } else {
                db->fragshift = ld2(user_bytes_per_sec / 100 /
                                    (db->subdivision ? db->subdivision : 1));
                if (db->fragshift < 3)
                        db->fragshift = 3;
        }
 
        db->fragsize = 1 << db->fragshift;
        db->dma_fragsize = db->fragsize * db->cnt_factor;
        db->numfrag = bufs / db->dma_fragsize;
 
        while (db->numfrag < 4 && db->fragshift > 3) {
                db->fragshift--;
                db->fragsize = 1 << db->fragshift;
                db->dma_fragsize = db->fragsize * db->cnt_factor;
                db->numfrag = bufs / db->dma_fragsize;
        }
 
        if (db->ossmaxfrags >= 4 && db->ossmaxfrags < db->numfrag)
                db->numfrag = db->ossmaxfrags;
 
        db->dmasize = db->dma_fragsize * db->numfrag;
        memset(db->rawbuf, 0, bufs);
 
        pr_debug("prog_dmabuf: rate=%d, samplesize=%d, channels=%d\n",
            rate, db->sample_size, db->num_channels);
        pr_debug("prog_dmabuf: fragsize=%d, cnt_factor=%d, dma_fragsize=%d\n",
            db->fragsize, db->cnt_factor, db->dma_fragsize);
        pr_debug("prog_dmabuf: numfrag=%d, dmasize=%d\n", db->numfrag, db->dmasize);
 
        db->ready = 1;
        return 0;
}
 
static int
prog_dmabuf_adc(struct au1550_state *s)
{
        stop_adc(s);
        return prog_dmabuf(s, &s->dma_adc);
 
}
 
static int
prog_dmabuf_dac(struct au1550_state *s)
{
        stop_dac(s);
        return prog_dmabuf(s, &s->dma_dac);
}
 
 
static void dac_dma_interrupt(int irq, void *dev_id)
{
        struct au1550_state *s = (struct au1550_state *) dev_id;
        struct dmabuf  *db = &s->dma_dac;
        u32     ac97c_stat;
 
        spin_lock(&s->lock);
 
        ac97c_stat = au_readl(PSC_AC97STAT);
        if (ac97c_stat & (AC97C_XU | AC97C_XO | AC97C_TE))
                pr_debug("AC97C status = 0x%08x\n", ac97c_stat);
        db->dma_qcount--;
 
        if (db->count >= db->fragsize) {
                if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut,
                                                        db->fragsize) == 0) {
                        err("qcount < 2 and no ring room!");
                }
                db->nextOut += db->fragsize;
                if (db->nextOut >= db->rawbuf + db->dmasize)
                        db->nextOut -= db->dmasize;
                db->count -= db->fragsize;
                db->total_bytes += db->dma_fragsize;
                db->dma_qcount++;
        }
 
        /* wake up anybody listening */
        if (waitqueue_active(&db->wait))
                wake_up(&db->wait);
 
        spin_unlock(&s->lock);
}
 
 
static void adc_dma_interrupt(int irq, void *dev_id)
{
        struct  au1550_state *s = (struct au1550_state *)dev_id;
        struct  dmabuf  *dp = &s->dma_adc;
        u32     obytes;
        char    *obuf;
 
        spin_lock(&s->lock);
 
        /* Pull the buffer from the dma queue.
        */
        au1xxx_dbdma_get_dest(dp->dmanr, (void *)(&obuf), &obytes);
 
        if ((dp->count + obytes) > dp->dmasize) {
                /* Overrun. Stop ADC and log the error
                */
                spin_unlock(&s->lock);
                stop_adc(s);
                dp->error++;
                err("adc overrun");
                return;
        }
 
        /* Put a new empty buffer on the destination DMA.
        */
        au1xxx_dbdma_put_dest(dp->dmanr, dp->nextIn, dp->dma_fragsize);
 
        dp->nextIn += dp->dma_fragsize;
        if (dp->nextIn >= dp->rawbuf + dp->dmasize)
                dp->nextIn -= dp->dmasize;
 
        dp->count += obytes;
        dp->total_bytes += obytes;
 
        /* wake up anybody listening
        */
        if (waitqueue_active(&dp->wait))
                wake_up(&dp->wait);
 
        spin_unlock(&s->lock);
}
 
static loff_t
au1550_llseek(struct file *file, loff_t offset, int origin)
{
        return -ESPIPE;
}
 
 
static int
au1550_open_mixdev(struct inode *inode, struct file *file)
{
        file->private_data = &au1550_state;
        return 0;
}
 
static int
au1550_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
au1550_ioctl_mixdev(struct inode *inode, struct file *file,
                               unsigned int cmd, unsigned long arg)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        struct ac97_codec *codec = s->codec;
 
        return mixdev_ioctl(codec, cmd, arg);
}
 
static /*const */ struct file_operations au1550_mixer_fops = {
        owner:THIS_MODULE,
        llseek:au1550_llseek,
        ioctl:au1550_ioctl_mixdev,
        open:au1550_open_mixdev,
        release:au1550_release_mixdev,
};
 
static int
drain_dac(struct au1550_state *s, int nonblock)
{
        unsigned long   flags;
        int             count, tmo;
 
        if (s->dma_dac.mapped || !s->dma_dac.ready || s->dma_dac.stopped)
                return 0;
 
        for (;;) {
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_dac.count;
                spin_unlock_irqrestore(&s->lock, flags);
                if (count <= s->dma_dac.fragsize)
                        break;
                if (signal_pending(current))
                        break;
                if (nonblock)
                        return -EBUSY;
                tmo = 1000 * count / (s->no_vra ?
                                      48000 : s->dma_dac.sample_rate);
                tmo /= s->dma_dac.dma_bytes_per_sample;
                au1550_delay(tmo);
        }
        if (signal_pending(current))
                return -ERESTARTSYS;
        return 0;
}
 
static inline u8 S16_TO_U8(s16 ch)
{
        return (u8) (ch >> 8) + 0x80;
}
static inline s16 U8_TO_S16(u8 ch)
{
        return (s16) (ch - 0x80) << 8;
}
 
/*
 * Translates user samples to dma buffer suitable for AC'97 DAC data:
 *     If mono, copy left channel to right channel in dma buffer.
 *     If 8 bit samples, cvt to 16-bit before writing to dma buffer.
 *     If interpolating (no VRA), duplicate every audio frame src_factor times.
 */
static int
translate_from_user(struct dmabuf *db, char* dmabuf, char* userbuf,
                                                               int dmacount)
{
        int             sample, i;
        int             interp_bytes_per_sample;
        int             num_samples;
        int             mono = (db->num_channels == 1);
        char            usersample[12];
        s16             ch, dmasample[6];
 
        if (db->sample_size == 16 && !mono && db->src_factor == 1) {
                /* no translation necessary, just copy
                */
                if (copy_from_user(dmabuf, userbuf, dmacount))
                        return -EFAULT;
                return dmacount;
        }
 
        interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor;
        num_samples = dmacount / interp_bytes_per_sample;
 
        for (sample = 0; sample < num_samples; sample++) {
                if (copy_from_user(usersample, userbuf,
                                   db->user_bytes_per_sample)) {
                        return -EFAULT;
                }
 
                for (i = 0; i < db->num_channels; i++) {
                        if (db->sample_size == 8)
                                ch = U8_TO_S16(usersample[i]);
                        else
                                ch = *((s16 *) (&usersample[i * 2]));
                        dmasample[i] = ch;
                        if (mono)
                                dmasample[i + 1] = ch;  /* right channel */
                }
 
                /* duplicate every audio frame src_factor times
                */
                for (i = 0; i < db->src_factor; i++)
                        memcpy(dmabuf, dmasample, db->dma_bytes_per_sample);
 
                userbuf += db->user_bytes_per_sample;
                dmabuf += interp_bytes_per_sample;
        }
 
        return num_samples * interp_bytes_per_sample;
}
 
/*
 * Translates AC'97 ADC samples to user buffer:
 *     If mono, send only left channel to user buffer.
 *     If 8 bit samples, cvt from 16 to 8 bit before writing to user buffer.
 *     If decimating (no VRA), skip over src_factor audio frames.
 */
static int
translate_to_user(struct dmabuf *db, char* userbuf, char* dmabuf,
                                                             int dmacount)
{
        int             sample, i;
        int             interp_bytes_per_sample;
        int             num_samples;
        int             mono = (db->num_channels == 1);
        char            usersample[12];
 
        if (db->sample_size == 16 && !mono && db->src_factor == 1) {
                /* no translation necessary, just copy
                */
                if (copy_to_user(userbuf, dmabuf, dmacount))
                        return -EFAULT;
                return dmacount;
        }
 
        interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor;
        num_samples = dmacount / interp_bytes_per_sample;
 
        for (sample = 0; sample < num_samples; sample++) {
                for (i = 0; i < db->num_channels; i++) {
                        if (db->sample_size == 8)
                                usersample[i] =
                                        S16_TO_U8(*((s16 *) (&dmabuf[i * 2])));
                        else
                                *((s16 *) (&usersample[i * 2])) =
                                        *((s16 *) (&dmabuf[i * 2]));
                }
 
                if (copy_to_user(userbuf, usersample,
                                 db->user_bytes_per_sample)) {
                        return -EFAULT;
                }
 
                userbuf += db->user_bytes_per_sample;
                dmabuf += interp_bytes_per_sample;
        }
 
        return num_samples * interp_bytes_per_sample;
}
 
/*
 * Copy audio data to/from user buffer from/to dma buffer, taking care
 * that we wrap when reading/writing the dma buffer. Returns actual byte
 * count written to or read from the dma buffer.
 */
static int
copy_dmabuf_user(struct dmabuf *db, char* userbuf, int count, int to_user)
{
        char           *bufptr = to_user ? db->nextOut : db->nextIn;
        char           *bufend = db->rawbuf + db->dmasize;
        int             cnt, ret;
 
        if (bufptr + count > bufend) {
                int             partial = (int) (bufend - bufptr);
                if (to_user) {
                        if ((cnt = translate_to_user(db, userbuf,
                                                     bufptr, partial)) < 0)
                                return cnt;
                        ret = cnt;
                        if ((cnt = translate_to_user(db, userbuf + partial,
                                                     db->rawbuf,
                                                     count - partial)) < 0)
                                return cnt;
                        ret += cnt;
                } else {
                        if ((cnt = translate_from_user(db, bufptr, userbuf,
                                                       partial)) < 0)
                                return cnt;
                        ret = cnt;
                        if ((cnt = translate_from_user(db, db->rawbuf,
                                                       userbuf + partial,
                                                       count - partial)) < 0)
                                return cnt;
                        ret += cnt;
                }
        } else {
                if (to_user)
                        ret = translate_to_user(db, userbuf, bufptr, count);
                else
                        ret = translate_from_user(db, bufptr, userbuf, count);
        }
 
        return ret;
}
 
 
static ssize_t
au1550_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        struct dmabuf  *db = &s->dma_adc;
        DECLARE_WAITQUEUE(wait, current);
        ssize_t         ret;
        unsigned long   flags;
        int             cnt, usercnt, avail;
 
        if (db->mapped)
                return -ENXIO;
        if (!access_ok(VERIFY_WRITE, buffer, count))
                return -EFAULT;
        ret = 0;
 
        count *= db->cnt_factor;
 
        mutex_lock(&s->sem);
        add_wait_queue(&db->wait, &wait);
 
        while (count > 0) {
                /* wait for samples in ADC dma buffer
                */
                do {
                        spin_lock_irqsave(&s->lock, flags);
                        if (db->stopped)
                                start_adc(s);
                        avail = db->count;
                        if (avail <= 0)
                                __set_current_state(TASK_INTERRUPTIBLE);
                        spin_unlock_irqrestore(&s->lock, flags);
                        if (avail <= 0) {
                                if (file->f_flags & O_NONBLOCK) {
                                        if (!ret)
                                                ret = -EAGAIN;
                                        goto out;
                                }
                                mutex_unlock(&s->sem);
                                schedule();
                                if (signal_pending(current)) {
                                        if (!ret)
                                                ret = -ERESTARTSYS;
                                        goto out2;
                                }
                                mutex_lock(&s->sem);
                        }
                } while (avail <= 0);
 
                /* copy from nextOut to user
                */
                if ((cnt = copy_dmabuf_user(db, buffer,
                                            count > avail ?
                                            avail : count, 1)) < 0) {
                        if (!ret)
                                ret = -EFAULT;
                        goto out;
                }
 
                spin_lock_irqsave(&s->lock, flags);
                db->count -= cnt;
                db->nextOut += cnt;
                if (db->nextOut >= db->rawbuf + db->dmasize)
                        db->nextOut -= db->dmasize;
                spin_unlock_irqrestore(&s->lock, flags);
 
                count -= cnt;
                usercnt = cnt / db->cnt_factor;
                buffer += usercnt;
                ret += usercnt;
        }                       /* while (count > 0) */
 
out:
        mutex_unlock(&s->sem);
out2:
        remove_wait_queue(&db->wait, &wait);
        set_current_state(TASK_RUNNING);
        return ret;
}
 
static ssize_t
au1550_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        struct dmabuf  *db = &s->dma_dac;
        DECLARE_WAITQUEUE(wait, current);
        ssize_t         ret = 0;
        unsigned long   flags;
        int             cnt, usercnt, avail;
 
        pr_debug("write: count=%d\n", count);
 
        if (db->mapped)
                return -ENXIO;
        if (!access_ok(VERIFY_READ, buffer, count))
                return -EFAULT;
 
        count *= db->cnt_factor;
 
        mutex_lock(&s->sem);
        add_wait_queue(&db->wait, &wait);
 
        while (count > 0) {
                /* wait for space in playback buffer
                */
                do {
                        spin_lock_irqsave(&s->lock, flags);
                        avail = (int) db->dmasize - db->count;
                        if (avail <= 0)
                                __set_current_state(TASK_INTERRUPTIBLE);
                        spin_unlock_irqrestore(&s->lock, flags);
                        if (avail <= 0) {
                                if (file->f_flags & O_NONBLOCK) {
                                        if (!ret)
                                                ret = -EAGAIN;
                                        goto out;
                                }
                                mutex_unlock(&s->sem);
                                schedule();
                                if (signal_pending(current)) {
                                        if (!ret)
                                                ret = -ERESTARTSYS;
                                        goto out2;
                                }
                                mutex_lock(&s->sem);
                        }
                } while (avail <= 0);
 
                /* copy from user to nextIn
                */
                if ((cnt = copy_dmabuf_user(db, (char *) buffer,
                                            count > avail ?
                                            avail : count, 0)) < 0) {
                        if (!ret)
                                ret = -EFAULT;
                        goto out;
                }
 
                spin_lock_irqsave(&s->lock, flags);
                db->count += cnt;
                db->nextIn += cnt;
                if (db->nextIn >= db->rawbuf + db->dmasize)
                        db->nextIn -= db->dmasize;
 
                /* If the data is available, we want to keep two buffers
                 * on the dma queue.  If the queue count reaches zero,
                 * we know the dma has stopped.
                 */
                while ((db->dma_qcount < 2) && (db->count >= db->fragsize)) {
                        if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut,
                                                        db->fragsize) == 0) {
                                err("qcount < 2 and no ring room!");
                        }
                        db->nextOut += db->fragsize;
                        if (db->nextOut >= db->rawbuf + db->dmasize)
                                db->nextOut -= db->dmasize;
                        db->total_bytes += db->dma_fragsize;
                        if (db->dma_qcount == 0)
                                start_dac(s);
                        db->dma_qcount++;
                }
                spin_unlock_irqrestore(&s->lock, flags);
 
                count -= cnt;
                usercnt = cnt / db->cnt_factor;
                buffer += usercnt;
                ret += usercnt;
        }                       /* while (count > 0) */
 
out:
        mutex_unlock(&s->sem);
out2:
        remove_wait_queue(&db->wait, &wait);
        set_current_state(TASK_RUNNING);
        return ret;
}
 
 
/* No kernel lock - we have our own spinlock */
static unsigned int
au1550_poll(struct file *file, struct poll_table_struct *wait)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        unsigned long   flags;
        unsigned int    mask = 0;
 
        if (file->f_mode & FMODE_WRITE) {
                if (!s->dma_dac.ready)
                        return 0;
                poll_wait(file, &s->dma_dac.wait, wait);
        }
        if (file->f_mode & FMODE_READ) {
                if (!s->dma_adc.ready)
                        return 0;
                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.dma_fragsize)
                        mask |= POLLIN | POLLRDNORM;
        }
        if (file->f_mode & FMODE_WRITE) {
                if (s->dma_dac.mapped) {
                        if (s->dma_dac.count >=
                            (signed)s->dma_dac.dma_fragsize)
                                mask |= POLLOUT | POLLWRNORM;
                } else {
                        if ((signed) s->dma_dac.dmasize >=
                            s->dma_dac.count + (signed)s->dma_dac.dma_fragsize)
                                mask |= POLLOUT | POLLWRNORM;
                }
        }
        spin_unlock_irqrestore(&s->lock, flags);
        return mask;
}
 
static int
au1550_mmap(struct file *file, struct vm_area_struct *vma)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        struct dmabuf  *db;
        unsigned long   size;
        int ret = 0;
 
        lock_kernel();
        mutex_lock(&s->sem);
        if (vma->vm_flags & VM_WRITE)
                db = &s->dma_dac;
        else if (vma->vm_flags & VM_READ)
                db = &s->dma_adc;
        else {
                ret = -EINVAL;
                goto out;
        }
        if (vma->vm_pgoff != 0) {
                ret = -EINVAL;
                goto out;
        }
        size = vma->vm_end - vma->vm_start;
        if (size > (PAGE_SIZE << db->buforder)) {
                ret = -EINVAL;
                goto out;
        }
        if (remap_pfn_range(vma, vma->vm_start, page_to_pfn(virt_to_page(db->rawbuf)),
                             size, vma->vm_page_prot)) {
                ret = -EAGAIN;
                goto out;
        }
        vma->vm_flags &= ~VM_IO;
        db->mapped = 1;
out:
        mutex_unlock(&s->sem);
        unlock_kernel();
        return ret;
}
 
#ifdef 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_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_SETFMT, "SNDCTL_DSP_SETFMT"},
        {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
dma_count_done(struct dmabuf *db)
{
        if (db->stopped)
                return 0;
 
        return db->dma_fragsize - au1xxx_get_dma_residue(db->dmanr);
}
 
 
static int
au1550_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
                                                        unsigned long arg)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
        unsigned long   flags;
        audio_buf_info  abinfo;
        count_info      cinfo;
        int             count;
        int             val, mapped, ret, diff;
 
        mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) ||
                ((file->f_mode & FMODE_READ) && s->dma_adc.mapped);
 
#ifdef DEBUG
        for (count = 0; count < ARRAY_SIZE(ioctl_str); count++) {
                if (ioctl_str[count].cmd == cmd)
                        break;
        }
        if (count < ARRAY_SIZE(ioctl_str))
                pr_debug("ioctl %s, arg=0x%lxn", ioctl_str[count].str, arg);
        else
                pr_debug("ioctl 0x%x unknown, arg=0x%lx\n", cmd, arg);
#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 | DSP_CAP_REALTIME |
                                DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg);
 
        case SNDCTL_DSP_RESET:
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        synchronize_irq();
                        s->dma_dac.count = s->dma_dac.total_bytes = 0;
                        s->dma_dac.nextIn = s->dma_dac.nextOut =
                                s->dma_dac.rawbuf;
                }
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        synchronize_irq();
                        s->dma_adc.count = s->dma_adc.total_bytes = 0;
                        s->dma_adc.nextIn = s->dma_adc.nextOut =
                                s->dma_adc.rawbuf;
                }
                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 (file->f_mode & FMODE_WRITE) {
                                stop_dac(s);
                                set_dac_rate(s, val);
                        }
                        if (s->open_mode & FMODE_READ)
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        if (s->open_mode & FMODE_WRITE)
                                if ((ret = prog_dmabuf_dac(s)))
                                        return ret;
                }
                return put_user((file->f_mode & FMODE_READ) ?
                                s->dma_adc.sample_rate :
                                s->dma_dac.sample_rate,
                                (int *)arg);
 
        case SNDCTL_DSP_STEREO:
                if (get_user(val, (int *) arg))
                        return -EFAULT;
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        s->dma_adc.num_channels = val ? 2 : 1;
                        if ((ret = prog_dmabuf_adc(s)))
                                return ret;
                }
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        s->dma_dac.num_channels = val ? 2 : 1;
                        if (s->codec_ext_caps & AC97_EXT_DACS) {
                                /* disable surround and center/lfe in AC'97
                                */
                                u16 ext_stat = rdcodec(s->codec,
                                                       AC97_EXTENDED_STATUS);
                                wrcodec(s->codec, AC97_EXTENDED_STATUS,
                                        ext_stat | (AC97_EXTSTAT_PRI |
                                                    AC97_EXTSTAT_PRJ |
                                                    AC97_EXTSTAT_PRK));
                        }
                        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 (file->f_mode & FMODE_READ) {
                                if (val < 0 || val > 2)
                                        return -EINVAL;
                                stop_adc(s);
                                s->dma_adc.num_channels = val;
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        }
                        if (file->f_mode & FMODE_WRITE) {
                                switch (val) {
                                case 1:
                                case 2:
                                        break;
                                case 3:
                                case 5:
                                        return -EINVAL;
                                case 4:
                                        if (!(s->codec_ext_caps &
                                              AC97_EXTID_SDAC))
                                                return -EINVAL;
                                        break;
                                case 6:
                                        if ((s->codec_ext_caps &
                                             AC97_EXT_DACS) != AC97_EXT_DACS)
                                                return -EINVAL;
                                        break;
                                default:
                                        return -EINVAL;
                                }
 
                                stop_dac(s);
                                if (val <= 2 &&
                                    (s->codec_ext_caps & AC97_EXT_DACS)) {
                                        /* disable surround and center/lfe
                                         * channels in AC'97
                                         */
                                        u16             ext_stat =
                                                rdcodec(s->codec,
                                                        AC97_EXTENDED_STATUS);
                                        wrcodec(s->codec,
                                                AC97_EXTENDED_STATUS,
                                                ext_stat | (AC97_EXTSTAT_PRI |
                                                            AC97_EXTSTAT_PRJ |
                                                            AC97_EXTSTAT_PRK));
                                } else if (val >= 4) {
                                        /* enable surround, center/lfe
                                         * channels in AC'97
                                         */
                                        u16             ext_stat =
                                                rdcodec(s->codec,
                                                        AC97_EXTENDED_STATUS);
                                        ext_stat &= ~AC97_EXTSTAT_PRJ;
                                        if (val == 6)
                                                ext_stat &=
                                                        ~(AC97_EXTSTAT_PRI |
                                                          AC97_EXTSTAT_PRK);
                                        wrcodec(s->codec,
                                                AC97_EXTENDED_STATUS,
                                                ext_stat);
                                }
 
                                s->dma_dac.num_channels = 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 | AFMT_U8, (int *) arg);
 
        case SNDCTL_DSP_SETFMT: /* Selects ONE fmt */
                if (get_user(val, (int *) arg))
                        return -EFAULT;
                if (val != AFMT_QUERY) {
                        if (file->f_mode & FMODE_READ) {
                                stop_adc(s);
                                if (val == AFMT_S16_LE)
                                        s->dma_adc.sample_size = 16;
                                else {
                                        val = AFMT_U8;
                                        s->dma_adc.sample_size = 8;
                                }
                                if ((ret = prog_dmabuf_adc(s)))
                                        return ret;
                        }
                        if (file->f_mode & FMODE_WRITE) {
                                stop_dac(s);
                                if (val == AFMT_S16_LE)
                                        s->dma_dac.sample_size = 16;
                                else {
                                        val = AFMT_U8;
                                        s->dma_dac.sample_size = 8;
                                }
                                if ((ret = prog_dmabuf_dac(s)))
                                        return ret;
                        }
                } else {
                        if (file->f_mode & FMODE_READ)
                                val = (s->dma_adc.sample_size == 16) ?
                                        AFMT_S16_LE : AFMT_U8;
                        else
                                val = (s->dma_dac.sample_size == 16) ?
                                        AFMT_S16_LE : AFMT_U8;
                }
                return put_user(val, (int *) arg);
 
        case SNDCTL_DSP_POST:
                return 0;
 
        case SNDCTL_DSP_GETTRIGGER:
                val = 0;
                spin_lock_irqsave(&s->lock, flags);
                if (file->f_mode & FMODE_READ && !s->dma_adc.stopped)
                        val |= PCM_ENABLE_INPUT;
                if (file->f_mode & FMODE_WRITE && !s->dma_dac.stopped)
                        val |= PCM_ENABLE_OUTPUT;
                spin_unlock_irqrestore(&s->lock, flags);
                return put_user(val, (int *) arg);
 
        case SNDCTL_DSP_SETTRIGGER:
                if (get_user(val, (int *) arg))
                        return -EFAULT;
                if (file->f_mode & FMODE_READ) {
                        if (val & PCM_ENABLE_INPUT) {
                                spin_lock_irqsave(&s->lock, flags);
                                start_adc(s);
                                spin_unlock_irqrestore(&s->lock, flags);
                        } else
                                stop_adc(s);
                }
                if (file->f_mode & FMODE_WRITE) {
                        if (val & PCM_ENABLE_OUTPUT) {
                                spin_lock_irqsave(&s->lock, flags);
                                start_dac(s);
                                spin_unlock_irqrestore(&s->lock, flags);
                        } else
                                stop_dac(s);
                }
                return 0;
 
        case SNDCTL_DSP_GETOSPACE:
                if (!(file->f_mode & FMODE_WRITE))
                        return -EINVAL;
                abinfo.fragsize = s->dma_dac.fragsize;
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_dac.count;
                count -= dma_count_done(&s->dma_dac);
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                abinfo.bytes = (s->dma_dac.dmasize - count) /
                        s->dma_dac.cnt_factor;
                abinfo.fragstotal = s->dma_dac.numfrag;
                abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;
                pr_debug("ioctl SNDCTL_DSP_GETOSPACE: bytes=%d, fragments=%d\n", abinfo.bytes, abinfo.fragments);
                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;
                spin_lock_irqsave(&s->lock, flags);
                count = s->dma_adc.count;
                count += dma_count_done(&s->dma_adc);
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                abinfo.bytes = count / s->dma_adc.cnt_factor;
                abinfo.fragstotal = s->dma_adc.numfrag;
                abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift;
                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;
                count -= dma_count_done(&s->dma_dac);
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                count /= s->dma_dac.cnt_factor;
                return put_user(count, (int *) arg);
 
        case SNDCTL_DSP_GETIPTR:
                if (!(file->f_mode & FMODE_READ))
                        return -EINVAL;
                spin_lock_irqsave(&s->lock, flags);
                cinfo.bytes = s->dma_adc.total_bytes;
                count = s->dma_adc.count;
                if (!s->dma_adc.stopped) {
                        diff = dma_count_done(&s->dma_adc);
                        count += diff;
                        cinfo.bytes += diff;
                        cinfo.ptr =  virt_to_phys(s->dma_adc.nextIn) + diff -
                                virt_to_phys(s->dma_adc.rawbuf);
                } else
                        cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) -
                                virt_to_phys(s->dma_adc.rawbuf);
                if (s->dma_adc.mapped)
                        s->dma_adc.count &= (s->dma_adc.dma_fragsize-1);
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                cinfo.blocks = count >> s->dma_adc.fragshift;
                return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
 
        case SNDCTL_DSP_GETOPTR:
                if (!(file->f_mode & FMODE_READ))
                        return -EINVAL;
                spin_lock_irqsave(&s->lock, flags);
                cinfo.bytes = s->dma_dac.total_bytes;
                count = s->dma_dac.count;
                if (!s->dma_dac.stopped) {
                        diff = dma_count_done(&s->dma_dac);
                        count -= diff;
                        cinfo.bytes += diff;
                        cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) + diff -
                                virt_to_phys(s->dma_dac.rawbuf);
                } else
                        cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) -
                                virt_to_phys(s->dma_dac.rawbuf);
                if (s->dma_dac.mapped)
                        s->dma_dac.count &= (s->dma_dac.dma_fragsize-1);
                spin_unlock_irqrestore(&s->lock, flags);
                if (count < 0)
                        count = 0;
                cinfo.blocks = count >> s->dma_dac.fragshift;
                return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
 
        case SNDCTL_DSP_GETBLKSIZE:
                if (file->f_mode & FMODE_WRITE)
                        return put_user(s->dma_dac.fragsize, (int *) arg);
                else
                        return put_user(s->dma_adc.fragsize, (int *) arg);
 
        case SNDCTL_DSP_SETFRAGMENT:
                if (get_user(val, (int *) arg))
                        return -EFAULT;
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        s->dma_adc.ossfragshift = val & 0xffff;
                        s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff;
                        if (s->dma_adc.ossfragshift < 4)
                                s->dma_adc.ossfragshift = 4;
                        if (s->dma_adc.ossfragshift > 15)
                                s->dma_adc.ossfragshift = 15;
                        if (s->dma_adc.ossmaxfrags < 4)
                                s->dma_adc.ossmaxfrags = 4;
                        if ((ret = prog_dmabuf_adc(s)))
                                return ret;
                }
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        s->dma_dac.ossfragshift = val & 0xffff;
                        s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff;
                        if (s->dma_dac.ossfragshift < 4)
                                s->dma_dac.ossfragshift = 4;
                        if (s->dma_dac.ossfragshift > 15)
                                s->dma_dac.ossfragshift = 15;
                        if (s->dma_dac.ossmaxfrags < 4)
                                s->dma_dac.ossmaxfrags = 4;
                        if ((ret = prog_dmabuf_dac(s)))
                                return ret;
                }
                return 0;
 
        case SNDCTL_DSP_SUBDIVIDE:
                if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) ||
                    (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision))
                        return -EINVAL;
                if (get_user(val, (int *) arg))
                        return -EFAULT;
                if (val != 1 && val != 2 && val != 4)
                        return -EINVAL;
                if (file->f_mode & FMODE_READ) {
                        stop_adc(s);
                        s->dma_adc.subdivision = val;
                        if ((ret = prog_dmabuf_adc(s)))
                                return ret;
                }
                if (file->f_mode & FMODE_WRITE) {
                        stop_dac(s);
                        s->dma_dac.subdivision = val;
                        if ((ret = prog_dmabuf_dac(s)))
                                return ret;
                }
                return 0;
 
        case SOUND_PCM_READ_RATE:
                return put_user((file->f_mode & FMODE_READ) ?
                                s->dma_adc.sample_rate :
                                s->dma_dac.sample_rate,
                                (int *)arg);
 
        case SOUND_PCM_READ_CHANNELS:
                if (file->f_mode & FMODE_READ)
                        return put_user(s->dma_adc.num_channels, (int *)arg);
                else
                        return put_user(s->dma_dac.num_channels, (int *)arg);
 
        case SOUND_PCM_READ_BITS:
                if (file->f_mode & FMODE_READ)
                        return put_user(s->dma_adc.sample_size, (int *)arg);
                else
                        return put_user(s->dma_dac.sample_size, (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
au1550_open(struct inode *inode, struct file *file)
{
        int             minor = MINOR(inode->i_rdev);
        DECLARE_WAITQUEUE(wait, current);
        struct au1550_state *s = &au1550_state;
        int             ret;
 
#ifdef DEBUG
        if (file->f_flags & O_NONBLOCK)
                pr_debug("open: non-blocking\n");
        else
                pr_debug("open: blocking\n");
#endif
 
        file->private_data = s;
        /* wait for device to become free */
        mutex_lock(&s->open_mutex);
        while (s->open_mode & file->f_mode) {
                if (file->f_flags & O_NONBLOCK) {
                        mutex_unlock(&s->open_mutex);
                        return -EBUSY;
                }
                add_wait_queue(&s->open_wait, &wait);
                __set_current_state(TASK_INTERRUPTIBLE);
                mutex_unlock(&s->open_mutex);
                schedule();
                remove_wait_queue(&s->open_wait, &wait);
                set_current_state(TASK_RUNNING);
                if (signal_pending(current))
                        return -ERESTARTSYS;
                mutex_lock(&s->open_mutex);
        }
 
        stop_dac(s);
        stop_adc(s);
 
        if (file->f_mode & FMODE_READ) {
                s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags =
                        s->dma_adc.subdivision = s->dma_adc.total_bytes = 0;
                s->dma_adc.num_channels = 1;
                s->dma_adc.sample_size = 8;
                set_adc_rate(s, 8000);
                if ((minor & 0xf) == SND_DEV_DSP16)
                        s->dma_adc.sample_size = 16;
        }
 
        if (file->f_mode & FMODE_WRITE) {
                s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags =
                        s->dma_dac.subdivision = s->dma_dac.total_bytes = 0;
                s->dma_dac.num_channels = 1;
                s->dma_dac.sample_size = 8;
                set_dac_rate(s, 8000);
                if ((minor & 0xf) == SND_DEV_DSP16)
                        s->dma_dac.sample_size = 16;
        }
 
        if (file->f_mode & FMODE_READ) {
                if ((ret = prog_dmabuf_adc(s)))
                        return ret;
        }
        if (file->f_mode & FMODE_WRITE) {
                if ((ret = prog_dmabuf_dac(s)))
                        return ret;
        }
 
        s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
        mutex_unlock(&s->open_mutex);
        mutex_init(&s->sem);
        return 0;
}
 
static int
au1550_release(struct inode *inode, struct file *file)
{
        struct au1550_state *s = (struct au1550_state *)file->private_data;
 
        lock_kernel();
 
        if (file->f_mode & FMODE_WRITE) {
                unlock_kernel();
                drain_dac(s, file->f_flags & O_NONBLOCK);
                lock_kernel();
        }
 
        mutex_lock(&s->open_mutex);
        if (file->f_mode & FMODE_WRITE) {
                stop_dac(s);
                kfree(s->dma_dac.rawbuf);
                s->dma_dac.rawbuf = NULL;
        }
        if (file->f_mode & FMODE_READ) {
                stop_adc(s);
                kfree(s->dma_adc.rawbuf);
                s->dma_adc.rawbuf = NULL;
        }
        s->open_mode &= ((~file->f_mode) & (FMODE_READ|FMODE_WRITE));
        mutex_unlock(&s->open_mutex);
        wake_up(&s->open_wait);
        unlock_kernel();
        return 0;
}
 
static /*const */ struct file_operations au1550_audio_fops = {
        owner:          THIS_MODULE,
        llseek:         au1550_llseek,
        read:           au1550_read,
        write:          au1550_write,
        poll:           au1550_poll,
        ioctl:          au1550_ioctl,
        mmap:           au1550_mmap,
        open:           au1550_open,
        release:        au1550_release,
};
 
MODULE_AUTHOR("Advanced Micro Devices (AMD), dan@embeddededge.com");
MODULE_DESCRIPTION("Au1550 AC97 Audio Driver");
MODULE_LICENSE("GPL");
 
 
static int __devinit
au1550_probe(void)
{
        struct au1550_state *s = &au1550_state;
        int             val;
 
        memset(s, 0, sizeof(struct au1550_state));
 
        init_waitqueue_head(&s->dma_adc.wait);
        init_waitqueue_head(&s->dma_dac.wait);
        init_waitqueue_head(&s->open_wait);
        mutex_init(&s->open_mutex);
        spin_lock_init(&s->lock);
 
        s->codec = ac97_alloc_codec();
        if(s->codec == NULL) {
                err("Out of memory");
                return -1;
        }
        s->codec->private_data = s;
        s->codec->id = 0;
        s->codec->codec_read = rdcodec;
        s->codec->codec_write = wrcodec;
        s->codec->codec_wait = waitcodec;
 
        if (!request_mem_region(CPHYSADDR(AC97_PSC_SEL),
                            0x30, "Au1550 AC97")) {
                err("AC'97 ports in use");
        }
 
        /* Allocate the DMA Channels
        */
        if ((s->dma_dac.dmanr = au1xxx_dbdma_chan_alloc(DBDMA_MEM_CHAN,
            DBDMA_AC97_TX_CHAN, dac_dma_interrupt, (void *)s)) == 0) {
                err("Can't get DAC DMA");
                goto err_dma1;
        }
        au1xxx_dbdma_set_devwidth(s->dma_dac.dmanr, 16);
        if (au1xxx_dbdma_ring_alloc(s->dma_dac.dmanr,
                                        NUM_DBDMA_DESCRIPTORS) == 0) {
                err("Can't get DAC DMA descriptors");
                goto err_dma1;
        }
 
        if ((s->dma_adc.dmanr = au1xxx_dbdma_chan_alloc(DBDMA_AC97_RX_CHAN,
            DBDMA_MEM_CHAN, adc_dma_interrupt, (void *)s)) == 0) {
                err("Can't get ADC DMA");
                goto err_dma2;
        }
        au1xxx_dbdma_set_devwidth(s->dma_adc.dmanr, 16);
        if (au1xxx_dbdma_ring_alloc(s->dma_adc.dmanr,
                                        NUM_DBDMA_DESCRIPTORS) == 0) {
                err("Can't get ADC DMA descriptors");
                goto err_dma2;
        }
 
        pr_info("DAC: DMA%d, ADC: DMA%d", DBDMA_AC97_TX_CHAN, DBDMA_AC97_RX_CHAN);
 
        /* register devices */
 
        if ((s->dev_audio = register_sound_dsp(&au1550_audio_fops, -1)) < 0)
                goto err_dev1;
        if ((s->codec->dev_mixer =
             register_sound_mixer(&au1550_mixer_fops, -1)) < 0)
                goto err_dev2;
 
        /* The GPIO for the appropriate PSC was configured by the
         * board specific start up.
         *
         * configure PSC for AC'97
         */
        au_writel(0, AC97_PSC_CTRL);     /* Disable PSC */
        au_sync();
        au_writel((PSC_SEL_CLK_SERCLK | PSC_SEL_PS_AC97MODE), AC97_PSC_SEL);
        au_sync();
 
        /* cold reset the AC'97
        */
        au_writel(PSC_AC97RST_RST, PSC_AC97RST);
        au_sync();
        au1550_delay(10);
        au_writel(0, PSC_AC97RST);
        au_sync();
 
        /* need to delay around 500msec(bleech) to give
           some CODECs enough time to wakeup */
        au1550_delay(500);
 
        /* warm reset the AC'97 to start the bitclk
        */
        au_writel(PSC_AC97RST_SNC, PSC_AC97RST);
        au_sync();
        udelay(100);
        au_writel(0, PSC_AC97RST);
        au_sync();
 
        /* Enable PSC
        */
        au_writel(PSC_CTRL_ENABLE, AC97_PSC_CTRL);
        au_sync();
 
        /* Wait for PSC ready.
        */
        do {
                val = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((val & PSC_AC97STAT_SR) == 0);
 
        /* Configure AC97 controller.
         * Deep FIFO, 16-bit sample, DMA, make sure DMA matches fifo size.
         */
        val = PSC_AC97CFG_SET_LEN(16);
        val |= PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8;
 
        /* Enable device so we can at least
         * talk over the AC-link.
         */
        au_writel(val, PSC_AC97CFG);
        au_writel(PSC_AC97MSK_ALLMASK, PSC_AC97MSK);
        au_sync();
        val |= PSC_AC97CFG_DE_ENABLE;
        au_writel(val, PSC_AC97CFG);
        au_sync();
 
        /* Wait for Device ready.
        */
        do {
                val = au_readl(PSC_AC97STAT);
                au_sync();
        } while ((val & PSC_AC97STAT_DR) == 0);
 
        /* codec init */
        if (!ac97_probe_codec(s->codec))
                goto err_dev3;
 
        s->codec_base_caps = rdcodec(s->codec, AC97_RESET);
        s->codec_ext_caps = rdcodec(s->codec, AC97_EXTENDED_ID);
        pr_info("AC'97 Base/Extended ID = %04x/%04x",
             s->codec_base_caps, s->codec_ext_caps);
 
        if (!(s->codec_ext_caps & AC97_EXTID_VRA)) {
                /* codec does not support VRA
                */
                s->no_vra = 1;
        } else if (!vra) {
                /* Boot option says disable VRA
                */
                u16 ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
                wrcodec(s->codec, AC97_EXTENDED_STATUS,
                        ac97_extstat & ~AC97_EXTSTAT_VRA);
                s->no_vra = 1;
        }
        if (s->no_vra)
                pr_info("no VRA, interpolating and decimating");
 
        /* set mic to be the recording source */
        val = SOUND_MASK_MIC;
        mixdev_ioctl(s->codec, SOUND_MIXER_WRITE_RECSRC,
                     (unsigned long) &val);
 
        return 0;
 
 err_dev3:
        unregister_sound_mixer(s->codec->dev_mixer);
 err_dev2:
        unregister_sound_dsp(s->dev_audio);
 err_dev1:
        au1xxx_dbdma_chan_free(s->dma_adc.dmanr);
 err_dma2:
        au1xxx_dbdma_chan_free(s->dma_dac.dmanr);
 err_dma1:
        release_mem_region(CPHYSADDR(AC97_PSC_SEL), 0x30);
 
        ac97_release_codec(s->codec);
        return -1;
}
 
static void __devinit
au1550_remove(void)
{
        struct au1550_state *s = &au1550_state;
 
        if (!s)
                return;
        synchronize_irq();
        au1xxx_dbdma_chan_free(s->dma_adc.dmanr);
        au1xxx_dbdma_chan_free(s->dma_dac.dmanr);
        release_mem_region(CPHYSADDR(AC97_PSC_SEL), 0x30);
        unregister_sound_dsp(s->dev_audio);
        unregister_sound_mixer(s->codec->dev_mixer);
        ac97_release_codec(s->codec);
}
 
static int __init
init_au1550(void)
{
        return au1550_probe();
}
 
static void __exit
cleanup_au1550(void)
{
        au1550_remove();
}
 
module_init(init_au1550);
module_exit(cleanup_au1550);
 
#ifndef MODULE
 
static int __init
au1550_setup(char *options)
{
        char           *this_opt;
 
        if (!options || !*options)
                return 0;
 
        while ((this_opt = strsep(&options, ","))) {
                if (!*this_opt)
                        continue;
                if (!strncmp(this_opt, "vra", 3)) {
                        vra = 1;
                }
        }
 
        return 1;
}
 
__setup("au1550_audio=", au1550_setup);
 
#endif /* MODULE */
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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [sound/] [oss/] [au1550_ac97.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* au1550_ac97.c -- Sound driver for Alchemy Au1550 MIPS Internet Edge`
3			`* Processor.`
4			`*`
5			`* Copyright 2004 Embedded Edge, LLC`
6			`* dan@embeddededge.com`
7			`*`
8			`* Mostly copied from the au1000.c driver and some from the`
9			`* PowerMac dbdma driver.`
10			`* We assume the processor can do memory coherent DMA.`
11			`*`
12			`* Ported to 2.6 by Matt Porter <mporter@kernel.crashing.org>`
13			`*`
14			`* This program is free software; you can redistribute it and/or modify it`
15			`* under the terms of the GNU General Public License as published by the`
16			`* Free Software Foundation; either version 2 of the License, or (at your`
17			`* option) any later version.`
18			`*`
19			* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
20			`* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF`
21			`* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN`
22			`* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,`
23			`* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT`
24			`* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF`
25			`* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON`
26			`* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT`
27			`* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF`
28			`* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.`
29			`*`
30			`* You should have received a copy of the GNU General Public License along`
31			`* with this program; if not, write to the Free Software Foundation, Inc.,`
32			`* 675 Mass Ave, Cambridge, MA 02139, USA.`
33			`*`
34			`*/`
35
36			`#undef DEBUG`
37
38			`#include <linux/module.h>`
39			`#include <linux/string.h>`
40			`#include <linux/ioport.h>`