Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1707 insertions, 0 deletions

diff --git a/sound/oss/nm256_audio.c b/sound/oss/nm256_audio.c
new file mode 100644
index 000000000000..f9166e135192
--- /dev/null
+++ b/sound/oss/nm256_audio.c
@@ -0,0 +1,1707 @@
+/* 
+ * Audio driver for the NeoMagic 256AV and 256ZX chipsets in native
+ * mode, with AC97 mixer support.
+ *
+ * Overall design and parts of this code stolen from vidc_*.c and
+ * skeleton.c.
+ *
+ * Yeah, there are a lot of magic constants in here.  You tell ME what
+ * they are.  I just get this stuff psychically, remember? 
+ *
+ * This driver was written by someone who wishes to remain anonymous. 
+ * It is in the public domain, so share and enjoy.  Try to make a profit
+ * off of it; go on, I dare you.  
+ *
+ * Changes:
+ * 11-10-2000   Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
+ *              Added some __init
+ * 19-04-2001   Marcus Meissner <mm@caldera.de>
+ *              Ported to 2.4 PCI API.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include "sound_config.h"
+#include "nm256.h"
+#include "nm256_coeff.h"
+
+int nm256_debug;
+static int force_load;
+
+/* 
+ * The size of the playback reserve.  When the playback buffer has less
+ * than NM256_PLAY_WMARK_SIZE bytes to output, we request a new
+ * buffer.
+ */
+#define NM256_PLAY_WMARK_SIZE 512
+
+static struct audio_driver nm256_audio_driver;
+
+static int nm256_grabInterrupt (struct nm256_info *card);
+static int nm256_releaseInterrupt (struct nm256_info *card);
+static irqreturn_t nm256_interrupt (int irq, void *dev_id, struct pt_regs *dummy);
+static irqreturn_t nm256_interrupt_zx (int irq, void *dev_id, struct pt_regs *dummy);
+static int handle_pm_event (struct pm_dev *dev, pm_request_t rqst, void *data);
+
+/* These belong in linux/pci.h. */
+#define PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO 0x8005
+#define PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO 0x8006
+#define PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO 0x8016
+
+/* List of cards.  */
+static struct nm256_info *nmcard_list;
+
+/* Release the mapped-in memory for CARD.  */
+static void
+nm256_release_ports (struct nm256_info *card)
+{
+    int x;
+
+    for (x = 0; x < 2; x++) {
+        if (card->port[x].ptr != NULL) {
+            iounmap (card->port[x].ptr);
+            card->port[x].ptr = NULL;
+        }
+    }
+}
+
+/* 
+ * Map in the memory ports for CARD, if they aren't already mapped in
+ * and have been configured.  If successful, a zero value is returned;
+ * otherwise any previously mapped-in areas are released and a non-zero
+ * value is returned.
+ *
+ * This is invoked twice, once for each port.  Ideally it would only be
+ * called once, but we now need to map in the second port in order to
+ * check how much memory the card has on the 256ZX.
+ */
+static int
+nm256_remap_ports (struct nm256_info *card)
+{
+    int x;
+
+    for (x = 0; x < 2; x++) {
+        if (card->port[x].ptr == NULL && card->port[x].end_offset > 0) {
+            u32 physaddr 
+                = card->port[x].physaddr + card->port[x].start_offset;
+            u32 size 
+                = card->port[x].end_offset - card->port[x].start_offset;
+
+            card->port[x].ptr = ioremap_nocache (physaddr, size);
+                                                  
+            if (card->port[x].ptr == NULL) {
+                printk (KERN_ERR "NM256: Unable to remap port %d\n", x + 1);
+                nm256_release_ports (card);
+                return -1;
+            }
+        }
+    }
+    return 0;
+}
+
+/* Locate the card in our list. */
+static struct nm256_info *
+nm256_find_card (int dev)
+{
+    struct nm256_info *card;
+
+    for (card = nmcard_list; card != NULL; card = card->next_card)
+        if (card->dev[0] == dev || card->dev[1] == dev)
+            return card;
+
+    return NULL;
+}
+
+/*
+ * Ditto, but find the card struct corresponding to the mixer device DEV 
+ * instead. 
+ */
+static struct nm256_info *
+nm256_find_card_for_mixer (int dev)
+{
+    struct nm256_info *card;
+
+    for (card = nmcard_list; card != NULL; card = card->next_card)
+        if (card->mixer_oss_dev == dev)
+            return card;
+
+    return NULL;
+}
+
+static int usecache;
+static int buffertop;
+
+/* Check to see if we're using the bank of cached coefficients. */
+int
+nm256_cachedCoefficients (struct nm256_info *card)
+{
+    return usecache;
+}
+
+/* The actual rates supported by the card. */
+static int samplerates[9] = {
+    8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000, 99999999
+};
+
+/*
+ * Set the card samplerate, word size and stereo mode to correspond to
+ * the settings in the CARD struct for the specified device in DEV.
+ * We keep two separate sets of information, one for each device; the
+ * hardware is not actually configured until a read or write is
+ * attempted.
+ */
+
+static int
+nm256_setInfo (int dev, struct nm256_info *card)
+{
+    int x;
+    int w;
+    int targetrate;
+
+    if (card->dev[0] == dev)
+        w = 0;
+    else if (card->dev[1] == dev)
+        w = 1;
+    else
+        return -ENODEV;
+
+    targetrate = card->sinfo[w].samplerate;
+
+    if ((card->sinfo[w].bits != 8 && card->sinfo[w].bits != 16)
+        || targetrate < samplerates[0]
+        || targetrate > samplerates[7])
+        return -EINVAL;
+
+    for (x = 0; x < 8; x++)
+        if (targetrate < ((samplerates[x] + samplerates[x + 1]) / 2))
+            break;
+
+    if (x < 8) {
+        u8 ratebits = ((x << 4) & NM_RATE_MASK);
+        if (card->sinfo[w].bits == 16)
+            ratebits |= NM_RATE_BITS_16;
+        if (card->sinfo[w].stereo)
+            ratebits |= NM_RATE_STEREO;
+
+        card->sinfo[w].samplerate = samplerates[x];
+
+
+        if (card->dev_for_play == dev && card->playing) {
+            if (nm256_debug)
+                printk (KERN_DEBUG "Setting play ratebits to 0x%x\n",
+                        ratebits);
+            nm256_loadCoefficient (card, 0, x);
+            nm256_writePort8 (card, 2,
+                              NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
+                              ratebits);
+        }
+
+        if (card->dev_for_record == dev && card->recording) {
+            if (nm256_debug)
+                printk (KERN_DEBUG "Setting record ratebits to 0x%x\n",
+                        ratebits);
+            nm256_loadCoefficient (card, 1, x);
+            nm256_writePort8 (card, 2,
+                              NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
+                              ratebits);
+        }
+        return 0;
+    }
+    else
+        return -EINVAL;
+}
+
+/* Start the play process going. */
+static void
+startPlay (struct nm256_info *card)
+{
+    if (! card->playing) {
+        card->playing = 1;
+        if (nm256_grabInterrupt (card) == 0) {
+            nm256_setInfo (card->dev_for_play, card);
+
+            /* Enable playback engine and interrupts. */
+            nm256_writePort8 (card, 2, NM_PLAYBACK_ENABLE_REG,
+                              NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
+
+            /* Enable both channels. */
+            nm256_writePort16 (card, 2, NM_AUDIO_MUTE_REG, 0x0);
+        }
+    }
+}
+
+/* 
+ * Request one chunk of AMT bytes from the recording device.  When the
+ * operation is complete, the data will be copied into BUFFER and the
+ * function DMAbuf_inputintr will be invoked.
+ */
+
+static void
+nm256_startRecording (struct nm256_info *card, char *buffer, u32 amt)
+{
+    u32 endpos;
+    int enableEngine = 0;
+    u32 ringsize = card->recordBufferSize;
+    unsigned long flags;
+
+    if (amt > (ringsize / 2)) {
+        /*
+         * Of course this won't actually work right, because the
+         * caller is going to assume we will give what we got asked
+         * for.
+         */
+        printk (KERN_ERR "NM256: Read request too large: %d\n", amt);
+        amt = ringsize / 2;
+    }
+
+    if (amt < 8) {
+        printk (KERN_ERR "NM256: Read request too small; %d\n", amt);
+        return;
+    }
+
+    spin_lock_irqsave(&card->lock,flags);
+    /*
+     * If we're not currently recording, set up the start and end registers
+     * for the recording engine.
+     */
+    if (! card->recording) {
+        card->recording = 1;
+        if (nm256_grabInterrupt (card) == 0) {
+            card->curRecPos = 0;
+            nm256_setInfo (card->dev_for_record, card);
+            nm256_writePort32 (card, 2, NM_RBUFFER_START, card->abuf2);
+            nm256_writePort32 (card, 2, NM_RBUFFER_END,
+                                 card->abuf2 + ringsize);
+
+            nm256_writePort32 (card, 2, NM_RBUFFER_CURRP,
+                                 card->abuf2 + card->curRecPos);
+            enableEngine = 1;
+        }
+        else {
+            /* Not sure what else to do here.  */
+            spin_unlock_irqrestore(&card->lock,flags);
+            return;
+        }
+    }
+
+    /* 
+     * If we happen to go past the end of the buffer a bit (due to a
+     * delayed interrupt) it's OK.  So might as well set the watermark
+     * right at the end of the data we want.
+     */
+    endpos = card->abuf2 + ((card->curRecPos + amt) % ringsize);
+
+    card->recBuf = buffer;
+    card->requestedRecAmt = amt;
+    nm256_writePort32 (card, 2, NM_RBUFFER_WMARK, endpos);
+    /* Enable recording engine and interrupts. */
+    if (enableEngine)
+        nm256_writePort8 (card, 2, NM_RECORD_ENABLE_REG,
+                            NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
+
+    spin_unlock_irqrestore(&card->lock,flags);
+}
+
+/* Stop the play engine. */
+static void
+stopPlay (struct nm256_info *card)
+{
+    /* Shut off sound from both channels. */
+    nm256_writePort16 (card, 2, NM_AUDIO_MUTE_REG,
+                       NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
+    /* Disable play engine. */
+    nm256_writePort8 (card, 2, NM_PLAYBACK_ENABLE_REG, 0);
+    if (card->playing) {
+        nm256_releaseInterrupt (card);
+
+        /* Reset the relevant state bits. */
+        card->playing = 0;
+        card->curPlayPos = 0;
+    }
+}
+
+/* Stop recording. */
+static void
+stopRecord (struct nm256_info *card)
+{
+    /* Disable recording engine. */
+    nm256_writePort8 (card, 2, NM_RECORD_ENABLE_REG, 0);
+
+    if (card->recording) {
+        nm256_releaseInterrupt (card);
+
+        card->recording = 0;
+        card->curRecPos = 0;
+    }
+}
+
+/*
+ * Ring buffers, man.  That's where the hip-hop, wild-n-wooly action's at.
+ * 1972?  (Well, I suppose it was cheep-n-easy to implement.)
+ *
+ * Write AMT bytes of BUFFER to the playback ring buffer, and start the
+ * playback engine running.  It will only accept up to 1/2 of the total
+ * size of the ring buffer.  No check is made that we're about to overwrite
+ * the currently-playing sample.
+ */
+
+static void
+nm256_write_block (struct nm256_info *card, char *buffer, u32 amt)
+{
+    u32 ringsize = card->playbackBufferSize;
+    u32 endstop;
+    unsigned long flags;
+
+    if (amt > (ringsize / 2)) {
+        printk (KERN_ERR "NM256: Write request too large: %d\n", amt);
+        amt = (ringsize / 2);
+    }
+
+    if (amt < NM256_PLAY_WMARK_SIZE) {
+        printk (KERN_ERR "NM256: Write request too small: %d\n", amt);
+        return;
+    }
+
+    card->curPlayPos %= ringsize;
+
+    card->requested_amt = amt;
+
+    spin_lock_irqsave(&card->lock,flags);
+
+    if ((card->curPlayPos + amt) >= ringsize) {
+        u32 rem = ringsize - card->curPlayPos;
+
+        nm256_writeBuffer8 (card, buffer, 1,
+                              card->abuf1 + card->curPlayPos,
+                              rem);
+        if (amt > rem)
+            nm256_writeBuffer8 (card, buffer + rem, 1, card->abuf1,
+                                  amt - rem);
+    } 
+    else
+        nm256_writeBuffer8 (card, buffer, 1,
+                              card->abuf1 + card->curPlayPos,
+                              amt);
+
+    /*
+     * Setup the start-n-stop-n-limit registers, and start that engine
+     * goin'. 
+     *
+     * Normally we just let it wrap around to avoid the click-click
+     * action scene.
+     */
+    if (! card->playing) {
+        /* The PBUFFER_END register in this case points to one sample
+           before the end of the buffer. */
+        int w = (card->dev_for_play == card->dev[0] ? 0 : 1);
+        int sampsize = (card->sinfo[w].bits == 16 ? 2 : 1);
+
+        if (card->sinfo[w].stereo)
+            sampsize *= 2;
+
+        /* Need to set the not-normally-changing-registers up. */
+        nm256_writePort32 (card, 2, NM_PBUFFER_START,
+                             card->abuf1 + card->curPlayPos);
+        nm256_writePort32 (card, 2, NM_PBUFFER_END,
+                             card->abuf1 + ringsize - sampsize);
+        nm256_writePort32 (card, 2, NM_PBUFFER_CURRP,
+                             card->abuf1 + card->curPlayPos);
+    }
+    endstop = (card->curPlayPos + amt - NM256_PLAY_WMARK_SIZE) % ringsize;
+    nm256_writePort32 (card, 2, NM_PBUFFER_WMARK, card->abuf1 + endstop);
+
+    if (! card->playing)
+        startPlay (card);
+
+    spin_unlock_irqrestore(&card->lock,flags);
+}
+
+/*  We just got a card playback interrupt; process it.  */
+static void
+nm256_get_new_block (struct nm256_info *card)
+{
+    /* Check to see how much got played so far. */
+    u32 amt = nm256_readPort32 (card, 2, NM_PBUFFER_CURRP) - card->abuf1;
+
+    if (amt >= card->playbackBufferSize) {
+        printk (KERN_ERR "NM256: Sound playback pointer invalid!\n");
+        amt = 0;
+    }
+
+    if (amt < card->curPlayPos)
+        amt = (card->playbackBufferSize - card->curPlayPos) + amt;
+    else
+        amt -= card->curPlayPos;
+
+    if (card->requested_amt > (amt + NM256_PLAY_WMARK_SIZE)) {
+        u32 endstop =
+            card->curPlayPos + card->requested_amt - NM256_PLAY_WMARK_SIZE;
+        nm256_writePort32 (card, 2, NM_PBUFFER_WMARK, card->abuf1 + endstop);
+    } 
+    else {
+        card->curPlayPos += card->requested_amt;
+        /* Get a new block to write.  This will eventually invoke
+           nm256_write_block () or stopPlay ().  */
+        DMAbuf_outputintr (card->dev_for_play, 1);
+    }
+}
+
+/* 
+ * Read the last-recorded block from the ring buffer, copy it into the
+ * saved buffer pointer, and invoke DMAuf_inputintr() with the recording
+ * device. 
+ */
+
+static void
+nm256_read_block (struct nm256_info *card)
+{
+    /* Grab the current position of the recording pointer. */
+    u32 currptr = nm256_readPort32 (card, 2, NM_RBUFFER_CURRP) - card->abuf2;
+    u32 amtToRead = card->requestedRecAmt;
+    u32 ringsize = card->recordBufferSize;
+
+    if (currptr >= card->recordBufferSize) {
+        printk (KERN_ERR "NM256: Sound buffer record pointer invalid!\n");
+        currptr = 0;
+    }
+
+    /*
+     * This test is probably redundant; we shouldn't be here unless
+     * it's true.
+     */
+    if (card->recording) {
+        /* If we wrapped around, copy everything from the start of our
+           recording buffer to the end of the buffer. */
+        if (currptr < card->curRecPos) {
+            u32 amt = min (ringsize - card->curRecPos, amtToRead);
+
+            nm256_readBuffer8 (card, card->recBuf, 1,
+                                 card->abuf2 + card->curRecPos,
+                                 amt);
+            amtToRead -= amt;
+            card->curRecPos += amt;
+            card->recBuf += amt;
+            if (card->curRecPos == ringsize)
+                card->curRecPos = 0;
+        }
+
+        if ((card->curRecPos < currptr) && (amtToRead > 0)) {
+            u32 amt = min (currptr - card->curRecPos, amtToRead);
+            nm256_readBuffer8 (card, card->recBuf, 1,
+                                 card->abuf2 + card->curRecPos, amt);
+            card->curRecPos = ((card->curRecPos + amt) % ringsize);
+        }
+        card->recBuf = NULL;
+        card->requestedRecAmt = 0;
+        DMAbuf_inputintr (card->dev_for_record);
+    }
+}
+
+/*
+ * Initialize the hardware. 
+ */
+static void
+nm256_initHw (struct nm256_info *card)
+{
+    /* Reset everything. */
+    nm256_writePort8 (card, 2, 0x0, 0x11);
+    nm256_writePort16 (card, 2, 0x214, 0);
+
+    stopRecord (card);
+    stopPlay (card);
+}
+
+/* 
+ * Handle a potential interrupt for the device referred to by DEV_ID. 
+ *
+ * I don't like the cut-n-paste job here either between the two routines,
+ * but there are sufficient differences between the two interrupt handlers
+ * that parameterizing it isn't all that great either.  (Could use a macro,
+ * I suppose...yucky bleah.)
+ */
+
+static irqreturn_t
+nm256_interrupt (int irq, void *dev_id, struct pt_regs *dummy)
+{
+    struct nm256_info *card = (struct nm256_info *)dev_id;
+    u16 status;
+    static int badintrcount;
+    int handled = 0;
+
+    if ((card == NULL) || (card->magsig != NM_MAGIC_SIG)) {
+        printk (KERN_ERR "NM256: Bad card pointer\n");
+        return IRQ_NONE;
+    }
+
+    status = nm256_readPort16 (card, 2, NM_INT_REG);
+
+    /* Not ours. */
+    if (status == 0) {
+        if (badintrcount++ > 1000) {
+            /*
+             * I'm not sure if the best thing is to stop the card from
+             * playing or just release the interrupt (after all, we're in
+             * a bad situation, so doing fancy stuff may not be such a good
+             * idea).
+             *
+             * I worry about the card engine continuing to play noise
+             * over and over, however--that could become a very
+             * obnoxious problem.  And we know that when this usually
+             * happens things are fairly safe, it just means the user's
+             * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
+             */
+
+            handled = 1;
+            if (card->playing)
+                stopPlay (card);
+            if (card->recording)
+                stopRecord (card);
+            badintrcount = 0;
+        }
+        return IRQ_RETVAL(handled);
+    }
+
+    badintrcount = 0;
+
+    /* Rather boring; check for individual interrupts and process them. */
+
+    if (status & NM_PLAYBACK_INT) {
+        handled = 1;
+        status &= ~NM_PLAYBACK_INT;
+        NM_ACK_INT (card, NM_PLAYBACK_INT);
+
+        if (card->playing)
+            nm256_get_new_block (card);
+    }
+
+    if (status & NM_RECORD_INT) {
+        handled = 1;
+        status &= ~NM_RECORD_INT;
+        NM_ACK_INT (card, NM_RECORD_INT);
+
+        if (card->recording)
+            nm256_read_block (card);
+    }
+
+    if (status & NM_MISC_INT_1) {
+        u8 cbyte;
+
+        handled = 1;
+        status &= ~NM_MISC_INT_1;
+        printk (KERN_ERR "NM256: Got misc interrupt #1\n");
+        NM_ACK_INT (card, NM_MISC_INT_1);
+        nm256_writePort16 (card, 2, NM_INT_REG, 0x8000);
+        cbyte = nm256_readPort8 (card, 2, 0x400);
+        nm256_writePort8 (card, 2, 0x400, cbyte | 2);
+    }
+
+    if (status & NM_MISC_INT_2) {
+        u8 cbyte;
+
+        handled = 1;
+        status &= ~NM_MISC_INT_2;
+        printk (KERN_ERR "NM256: Got misc interrupt #2\n");
+        NM_ACK_INT (card, NM_MISC_INT_2);
+        cbyte = nm256_readPort8 (card, 2, 0x400);
+        nm256_writePort8 (card, 2, 0x400, cbyte & ~2);
+    }
+
+    /* Unknown interrupt. */
+    if (status) {
+        handled = 1;
+        printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
+                status);
+        /* Pray. */
+        NM_ACK_INT (card, status);
+    }
+    return IRQ_RETVAL(handled);
+}
+
+/*
+ * Handle a potential interrupt for the device referred to by DEV_ID.
+ * This handler is for the 256ZX, and is very similar to the non-ZX
+ * routine.
+ */
+
+static irqreturn_t
+nm256_interrupt_zx (int irq, void *dev_id, struct pt_regs *dummy)
+{
+    struct nm256_info *card = (struct nm256_info *)dev_id;
+    u32 status;
+    static int badintrcount;
+    int handled = 0;
+
+    if ((card == NULL) || (card->magsig != NM_MAGIC_SIG)) {
+        printk (KERN_ERR "NM256: Bad card pointer\n");
+        return IRQ_NONE;
+    }
+
+    status = nm256_readPort32 (card, 2, NM_INT_REG);
+
+    /* Not ours. */
+    if (status == 0) {
+        if (badintrcount++ > 1000) {
+            printk (KERN_ERR "NM256: Releasing interrupt, over 1000 invalid interrupts\n");
+            /*
+             * I'm not sure if the best thing is to stop the card from
+             * playing or just release the interrupt (after all, we're in
+             * a bad situation, so doing fancy stuff may not be such a good
+             * idea).
+             *
+             * I worry about the card engine continuing to play noise
+             * over and over, however--that could become a very
+             * obnoxious problem.  And we know that when this usually
+             * happens things are fairly safe, it just means the user's
+             * inserted a PCMCIA card and someone's spamming us with 
+             * IRQ 9s.
+             */
+
+            handled = 1;
+            if (card->playing)
+                stopPlay (card);
+            if (card->recording)
+                stopRecord (card);
+            badintrcount = 0;
+        }
+        return IRQ_RETVAL(handled);
+    }
+
+    badintrcount = 0;
+
+    /* Rather boring; check for individual interrupts and process them. */
+
+    if (status & NM2_PLAYBACK_INT) {
+        handled = 1;
+        status &= ~NM2_PLAYBACK_INT;
+        NM2_ACK_INT (card, NM2_PLAYBACK_INT);
+
+        if (card->playing)
+            nm256_get_new_block (card);
+    }
+
+    if (status & NM2_RECORD_INT) {
+        handled = 1;
+        status &= ~NM2_RECORD_INT;
+        NM2_ACK_INT (card, NM2_RECORD_INT);
+
+        if (card->recording)
+            nm256_read_block (card);
+    }
+
+    if (status & NM2_MISC_INT_1) {
+        u8 cbyte;
+
+        handled = 1;
+        status &= ~NM2_MISC_INT_1;
+        printk (KERN_ERR "NM256: Got misc interrupt #1\n");
+        NM2_ACK_INT (card, NM2_MISC_INT_1);
+        cbyte = nm256_readPort8 (card, 2, 0x400);
+        nm256_writePort8 (card, 2, 0x400, cbyte | 2);
+    }
+
+    if (status & NM2_MISC_INT_2) {
+        u8 cbyte;
+
+        handled = 1;
+        status &= ~NM2_MISC_INT_2;
+        printk (KERN_ERR "NM256: Got misc interrupt #2\n");
+        NM2_ACK_INT (card, NM2_MISC_INT_2);
+        cbyte = nm256_readPort8 (card, 2, 0x400);
+        nm256_writePort8 (card, 2, 0x400, cbyte & ~2);
+    }
+
+    /* Unknown interrupt. */
+    if (status) {
+        handled = 1;
+        printk (KERN_ERR "NM256: Fire in the hole! Unknown status 0x%x\n",
+                status);
+        /* Pray. */
+        NM2_ACK_INT (card, status);
+    }
+    return IRQ_RETVAL(handled);
+}
+
+/* 
+ * Request our interrupt.
+ */
+static int
+nm256_grabInterrupt (struct nm256_info *card)
+{
+    if (card->has_irq++ == 0) {
+        if (request_irq (card->irq, card->introutine, SA_SHIRQ,
+                         "NM256_audio", card) < 0) {
+            printk (KERN_ERR "NM256: can't obtain IRQ %d\n", card->irq);
+            return -1;
+        }
+    }
+    return 0;
+}
+
+/* 
+ * Release our interrupt. 
+ */
+static int
+nm256_releaseInterrupt (struct nm256_info *card)
+{
+    if (card->has_irq <= 0) {
+        printk (KERN_ERR "nm256: too many calls to releaseInterrupt\n");
+        return -1;
+    }
+    card->has_irq--;
+    if (card->has_irq == 0) {
+        free_irq (card->irq, card);
+    }
+    return 0;
+}
+
+/*
+ * Waits for the mixer to become ready to be written; returns a zero value
+ * if it timed out.
+ */
+
+static int
+nm256_isReady (struct ac97_hwint *dev)
+{
+    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
+    int t2 = 10;
+    u32 testaddr;
+    u16 testb;
+    int done = 0;
+
+    if (card->magsig != NM_MAGIC_SIG) {
+        printk (KERN_ERR "NM256: Bad magic signature in isReady!\n");
+        return 0;
+    }
+
+    testaddr = card->mixer_status_offset;
+    testb = card->mixer_status_mask;
+
+    /* 
+     * Loop around waiting for the mixer to become ready. 
+     */
+    while (! done && t2-- > 0) {
+        if ((nm256_readPort16 (card, 2, testaddr) & testb) == 0)
+            done = 1;
+        else
+            udelay (100);
+    }
+    return done;
+}
+
+/*
+ * Return the contents of the AC97 mixer register REG.  Returns a positive
+ * value if successful, or a negative error code.
+ */
+static int
+nm256_readAC97Reg (struct ac97_hwint *dev, u8 reg)
+{
+    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
+
+    if (card->magsig != NM_MAGIC_SIG) {
+        printk (KERN_ERR "NM256: Bad magic signature in readAC97Reg!\n");
+        return -EINVAL;
+    }
+
+    if (reg < 128) {
+        int res;
+
+        nm256_isReady (dev);
+        res = nm256_readPort16 (card, 2, card->mixer + reg);
+        /* Magic delay.  Bleah yucky.  */
+        udelay (1000);
+        return res;
+    }
+    else
+        return -EINVAL;
+}
+
+/* 
+ * Writes VALUE to AC97 mixer register REG.  Returns 0 if successful, or
+ * a negative error code. 
+ */
+static int
+nm256_writeAC97Reg (struct ac97_hwint *dev, u8 reg, u16 value)
+{
+    unsigned long flags;
+    int tries = 2;
+    int done = 0;
+    u32 base;
+
+    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
+
+    if (card->magsig != NM_MAGIC_SIG) {
+        printk (KERN_ERR "NM256: Bad magic signature in writeAC97Reg!\n");
+        return -EINVAL;
+    }
+
+    base = card->mixer;
+
+    spin_lock_irqsave(&card->lock,flags);
+
+    nm256_isReady (dev);
+
+    /* Wait for the write to take, too. */
+    while ((tries-- > 0) && !done) {
+        nm256_writePort16 (card, 2, base + reg, value);
+        if (nm256_isReady (dev)) {
+            done = 1;
+            break;
+        }
+
+    }
+
+    spin_unlock_irqrestore(&card->lock,flags);
+    udelay (1000);
+
+    return ! done;
+}
+
+/* 
+ * Initial register values to be written to the AC97 mixer.
+ * While most of these are identical to the reset values, we do this
+ * so that we have most of the register contents cached--this avoids
+ * reading from the mixer directly (which seems to be problematic,
+ * probably due to ignorance).
+ */
+struct initialValues 
+{
+    unsigned short port;
+    unsigned short value;
+};
+
+static struct initialValues nm256_ac97_initial_values[] = 
+{
+    { AC97_MASTER_VOL_STEREO, 0x8000 },
+    { AC97_HEADPHONE_VOL,     0x8000 },
+    { AC97_MASTER_VOL_MONO,   0x0000 },
+    { AC97_PCBEEP_VOL,        0x0000 },
+    { AC97_PHONE_VOL,         0x0008 },
+    { AC97_MIC_VOL,           0x8000 },
+    { AC97_LINEIN_VOL,        0x8808 },
+    { AC97_CD_VOL,            0x8808 },
+    { AC97_VIDEO_VOL,         0x8808 },
+    { AC97_AUX_VOL,           0x8808 },
+    { AC97_PCMOUT_VOL,        0x0808 },
+    { AC97_RECORD_SELECT,     0x0000 },
+    { AC97_RECORD_GAIN,       0x0B0B },
+    { AC97_GENERAL_PURPOSE,   0x0000 },
+    { 0xffff, 0xffff }
+};
+
+/* Initialize the AC97 into a known state.  */
+static int
+nm256_resetAC97 (struct ac97_hwint *dev)
+{
+    struct nm256_info *card = (struct nm256_info *)dev->driver_private;
+    int x;
+
+    if (card->magsig != NM_MAGIC_SIG) {
+        printk (KERN_ERR "NM256: Bad magic signature in resetAC97!\n");
+        return -EINVAL;
+    }
+
+    /* Reset the mixer.  'Tis magic!  */
+    nm256_writePort8 (card, 2, 0x6c0, 1);
+//  nm256_writePort8 (card, 2, 0x6cc, 0x87);    /* This crashes Dell latitudes */
+    nm256_writePort8 (card, 2, 0x6cc, 0x80);
+    nm256_writePort8 (card, 2, 0x6cc, 0x0);
+
+    if (! card->mixer_values_init) {
+        for (x = 0; nm256_ac97_initial_values[x].port != 0xffff; x++) {
+            ac97_put_register (dev,
+                               nm256_ac97_initial_values[x].port,
+                               nm256_ac97_initial_values[x].value);
+            card->mixer_values_init = 1;
+        }
+    }
+
+    return 0;
+}
+
+/*
+ * We don't do anything particularly special here; it just passes the
+ * mixer ioctl to the AC97 driver.
+ */
+static int
+nm256_default_mixer_ioctl (int dev, unsigned int cmd, void __user *arg)
+{
+    struct nm256_info *card = nm256_find_card_for_mixer (dev);
+    if (card != NULL)
+        return ac97_mixer_ioctl (&(card->mdev), cmd, arg);
+    else
+        return -ENODEV;
+}
+
+static struct mixer_operations nm256_mixer_operations = {
+        .owner  = THIS_MODULE,
+        .id     = "NeoMagic",
+        .name   = "NM256AC97Mixer",
+        .ioctl  = nm256_default_mixer_ioctl
+};
+
+/*
+ * Default settings for the OSS mixer.  These are set last, after the
+ * mixer is initialized.
+ *
+ * I "love" C sometimes.  Got braces?
+ */
+static struct ac97_mixer_value_list mixer_defaults[] = {
+    { SOUND_MIXER_VOLUME,  { { 85, 85 } } },
+    { SOUND_MIXER_SPEAKER, { { 100 } } },
+    { SOUND_MIXER_PCM,     { { 65, 65 } } },
+    { SOUND_MIXER_CD,      { { 65, 65 } } },
+    { -1,                  {  { 0,  0 } } }
+};
+
+
+/* Installs the AC97 mixer into CARD.  */
+static int __init
+nm256_install_mixer (struct nm256_info *card)
+{
+    int mixer;
+
+    card->mdev.reset_device = nm256_resetAC97;
+    card->mdev.read_reg = nm256_readAC97Reg;
+    card->mdev.write_reg = nm256_writeAC97Reg;
+    card->mdev.driver_private = (void *)card;
+
+    if (ac97_init (&(card->mdev)))
+        return -1;
+
+    mixer = sound_alloc_mixerdev();
+    if (num_mixers >= MAX_MIXER_DEV) {
+        printk ("NM256 mixer: Unable to alloc mixerdev\n");
+        return -1;
+    }
+
+    mixer_devs[mixer] = &nm256_mixer_operations;
+    card->mixer_oss_dev = mixer;
+
+    /* Some reasonable default values.  */
+    ac97_set_values (&(card->mdev), mixer_defaults);
+
+    printk(KERN_INFO "Initialized AC97 mixer\n");
+    return 0;
+}
+
+/* Perform a full reset on the hardware; this is invoked when an APM
+   resume event occurs.  */
+static void
+nm256_full_reset (struct nm256_info *card)
+{
+    nm256_initHw (card);
+    ac97_reset (&(card->mdev));
+}
+
+/* 
+ * See if the signature left by the NM256 BIOS is intact; if so, we use
+ * the associated address as the end of our audio buffer in the video
+ * RAM.
+ */
+
+static void __init
+nm256_peek_for_sig (struct nm256_info *card)
+{
+    u32 port1offset 
+        = card->port[0].physaddr + card->port[0].end_offset - 0x0400;
+    /* The signature is located 1K below the end of video RAM.  */
+    char __iomem *temp = ioremap_nocache (port1offset, 16);
+    /* Default buffer end is 5120 bytes below the top of RAM.  */
+    u32 default_value = card->port[0].end_offset - 0x1400;
+    u32 sig;
+
+    /* Install the default value first, so we don't have to repeatedly
+       do it if there is a problem.  */
+    card->port[0].end_offset = default_value;
+
+    if (temp == NULL) {
+        printk (KERN_ERR "NM256: Unable to scan for card signature in video RAM\n");
+        return;
+    }
+    sig = readl (temp);
+    if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
+        u32 pointer = readl (temp + 4);
+
+        /*
+         * If it's obviously invalid, don't use it (the port already has a
+         * suitable default value set).
+         */
+        if (pointer != 0xffffffff)
+            card->port[0].end_offset = pointer;
+
+        printk (KERN_INFO "NM256: Found card signature in video RAM: 0x%x\n",
+                pointer);
+    }
+
+    iounmap (temp);
+}
+
+/* 
+ * Install a driver for the PCI device referenced by PCIDEV.
+ * VERSTR is a human-readable version string.
+ */
+
+static int __devinit
+nm256_install(struct pci_dev *pcidev, enum nm256rev rev, char *verstr)
+{
+    struct nm256_info *card;
+    struct pm_dev *pmdev;
+    int x;
+
+    if (pci_enable_device(pcidev))
+            return 0;
+
+    card = kmalloc (sizeof (struct nm256_info), GFP_KERNEL);
+    if (card == NULL) {
+        printk (KERN_ERR "NM256: out of memory!\n");
+        return 0;
+    }
+
+    card->magsig = NM_MAGIC_SIG;
+    card->playing  = 0;
+    card->recording = 0;
+    card->rev = rev;
+        spin_lock_init(&card->lock);
+
+    /* Init the memory port info.  */
+    for (x = 0; x < 2; x++) {
+        card->port[x].physaddr = pci_resource_start (pcidev, x);
+        card->port[x].ptr = NULL;
+        card->port[x].start_offset = 0;
+        card->port[x].end_offset = 0;
+    }
+
+    /* Port 2 is easy.  */
+    card->port[1].start_offset = 0;
+    card->port[1].end_offset = NM_PORT2_SIZE;
+
+    /* Yuck.  But we have to map in port 2 so we can check how much RAM the
+       card has.  */
+    if (nm256_remap_ports (card)) {
+        kfree (card);
+        return 0;
+    }
+
+    /* 
+     * The NM256 has two memory ports.  The first port is nothing
+     * more than a chunk of video RAM, which is used as the I/O ring
+     * buffer.  The second port has the actual juicy stuff (like the
+     * mixer and the playback engine control registers).
+     */
+
+    if (card->rev == REV_NM256AV) {
+        /* Ok, try to see if this is a non-AC97 version of the hardware. */
+        int pval = nm256_readPort16 (card, 2, NM_MIXER_PRESENCE);
+        if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
+            if (! force_load) {
+                printk (KERN_ERR "NM256: This doesn't look to me like the AC97-compatible version.\n");
+                printk (KERN_ERR "       You can force the driver to load by passing in the module\n");
+                printk (KERN_ERR "       parameter:\n");
+                printk (KERN_ERR "              force_load = 1\n");
+                printk (KERN_ERR "\n");
+                printk (KERN_ERR "       More likely, you should be using the appropriate SB-16 or\n");
+                printk (KERN_ERR "       CS4232 driver instead.  (If your BIOS has settings for\n");
+                printk (KERN_ERR "       IRQ and/or DMA for the sound card, this is *not* the correct\n");
+                printk (KERN_ERR "       driver to use.)\n");
+                nm256_release_ports (card);
+                kfree (card);
+                return 0;
+            }
+            else {
+                printk (KERN_INFO "NM256: Forcing driver load as per user request.\n");
+            }
+        }
+        else {
+         /*   printk (KERN_INFO "NM256: Congratulations. You're not running Eunice.\n")*/;
+        }
+        card->port[0].end_offset = 2560 * 1024;
+        card->introutine = nm256_interrupt;
+        card->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
+        card->mixer_status_mask = NM_MIXER_READY_MASK;
+    } 
+    else {
+        /* Not sure if there is any relevant detect for the ZX or not.  */
+        if (nm256_readPort8 (card, 2, 0xa0b) != 0)
+            card->port[0].end_offset = 6144 * 1024;
+        else
+            card->port[0].end_offset = 4096 * 1024;
+
+        card->introutine = nm256_interrupt_zx;
+        card->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
+        card->mixer_status_mask = NM2_MIXER_READY_MASK;
+    }
+
+    if (buffertop >= 98304 && buffertop < card->port[0].end_offset)
+        card->port[0].end_offset = buffertop;
+    else
+        nm256_peek_for_sig (card);
+
+    card->port[0].start_offset = card->port[0].end_offset - 98304;
+
+    printk (KERN_INFO "NM256: Mapping port 1 from 0x%x - 0x%x\n",
+            card->port[0].start_offset, card->port[0].end_offset);
+
+    if (nm256_remap_ports (card)) {
+        kfree (card);
+        return 0;
+    }
+
+    /* See if we can get the interrupt. */
+
+    card->irq = pcidev->irq;
+    card->has_irq = 0;
+
+    if (nm256_grabInterrupt (card) != 0) {
+        nm256_release_ports (card);
+        kfree (card);
+        return 0;
+    }
+
+    nm256_releaseInterrupt (card);
+
+    /*
+     *  Init the board.
+     */
+
+    card->playbackBufferSize = 16384;
+    card->recordBufferSize = 16384;
+
+    card->coeffBuf = card->port[0].end_offset - NM_MAX_COEFFICIENT;
+    card->abuf2 = card->coeffBuf - card->recordBufferSize;
+    card->abuf1 = card->abuf2 - card->playbackBufferSize;
+    card->allCoeffBuf = card->abuf2 - (NM_TOTAL_COEFF_COUNT * 4);
+
+    /* Fixed setting. */
+    card->mixer = NM_MIXER_OFFSET;
+    card->mixer_values_init = 0;
+
+    card->is_open_play = 0;
+    card->is_open_record = 0;
+
+    card->coeffsCurrent = 0;
+
+    card->opencnt[0] = 0; card->opencnt[1] = 0;
+
+    /* Reasonable default settings, but largely unnecessary. */
+    for (x = 0; x < 2; x++) {
+        card->sinfo[x].bits = 8;
+        card->sinfo[x].stereo = 0;
+        card->sinfo[x].samplerate = 8000;
+    }
+
+    nm256_initHw (card);
+
+    for (x = 0; x < 2; x++) {
+        if ((card->dev[x] =
+             sound_install_audiodrv(AUDIO_DRIVER_VERSION,
+                                    "NM256", &nm256_audio_driver,
+                                    sizeof(struct audio_driver),
+                                    DMA_NODMA, AFMT_U8 | AFMT_S16_LE,
+                                    NULL, -1, -1)) >= 0) {
+            /* 1K minimum buffer size. */
+            audio_devs[card->dev[x]]->min_fragment = 10;
+            /* Maximum of 8K buffer size. */
+            audio_devs[card->dev[x]]->max_fragment = 13;
+        }
+        else {
+            printk(KERN_ERR "NM256: Too many PCM devices available\n");
+            nm256_release_ports (card);
+            kfree (card);
+            return 0;
+        }
+    }
+
+    pci_set_drvdata(pcidev,card);
+
+    /* Insert the card in the list.  */
+    card->next_card = nmcard_list;
+    nmcard_list = card;
+
+    printk(KERN_INFO "Initialized NeoMagic %s audio in PCI native mode\n",
+           verstr);
+
+    /* 
+     * And our mixer.  (We should allow support for other mixers, maybe.)
+     */
+
+    nm256_install_mixer (card);
+
+    pmdev = pm_register(PM_PCI_DEV, PM_PCI_ID(pcidev), handle_pm_event);
+    if (pmdev)
+        pmdev->data = card;
+
+    return 1;
+}
+
+
+/*
+ * PM event handler, so the card is properly reinitialized after a power
+ * event.
+ */
+static int
+handle_pm_event (struct pm_dev *dev, pm_request_t rqst, void *data)
+{
+    struct nm256_info *crd = (struct nm256_info*) dev->data;
+    if (crd) {
+        switch (rqst) {
+        case PM_SUSPEND:
+            break;
+        case PM_RESUME:
+            {
+                int playing = crd->playing;
+                nm256_full_reset (crd);
+                /*
+                 * A little ugly, but that's ok; pretend the
+                 * block we were playing is done. 
+                 */
+                if (playing)
+                    DMAbuf_outputintr (crd->dev_for_play, 1);
+            }
+            break;
+        }
+    }
+    return 0;
+}
+
+static int __devinit
+nm256_probe(struct pci_dev *pcidev,const struct pci_device_id *pciid)
+{
+    if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO)
+        return nm256_install(pcidev, REV_NM256AV, "256AV");
+    if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO)
+        return nm256_install(pcidev, REV_NM256ZX, "256ZX");
+    if (pcidev->device == PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO)
+        return nm256_install(pcidev, REV_NM256ZX, "256XL+");
+    return -1; /* should not come here ... */
+}
+
+static void __devinit
+nm256_remove(struct pci_dev *pcidev) {
+    struct nm256_info *xcard = pci_get_drvdata(pcidev);
+    struct nm256_info *card,*next_card = NULL;
+
+    for (card = nmcard_list; card != NULL; card = next_card) {
+        next_card = card->next_card;
+        if (card == xcard) {
+            stopPlay (card);
+            stopRecord (card);
+            if (card->has_irq)
+                free_irq (card->irq, card);
+            nm256_release_ports (card);
+            sound_unload_mixerdev (card->mixer_oss_dev);
+            sound_unload_audiodev (card->dev[0]);
+            sound_unload_audiodev (card->dev[1]);
+            kfree (card);
+            break;
+        }
+    }
+    if (nmcard_list == card)
+        nmcard_list = next_card;
+}
+
+/*
+ * Open the device
+ *
+ * DEV  - device
+ * MODE - mode to open device (logical OR of OPEN_READ and OPEN_WRITE)
+ *
+ * Called when opening the DMAbuf               (dmabuf.c:259)
+ */
+static int
+nm256_audio_open(int dev, int mode)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+    int w;
+        
+    if (card == NULL)
+        return -ENODEV;
+
+    if (card->dev[0] == dev)
+        w = 0;
+    else if (card->dev[1] == dev)
+        w = 1;
+    else
+        return -ENODEV;
+
+    if (card->opencnt[w] > 0)
+        return -EBUSY;
+
+    /* No bits set? Huh? */
+    if (! ((mode & OPEN_READ) || (mode & OPEN_WRITE)))
+        return -EIO;
+
+    /*
+     * If it's open for both read and write, and the card's currently
+     * being read or written to, then do the opposite of what has
+     * already been done.  Otherwise, don't specify any mode until the
+     * user actually tries to do I/O.  (Some programs open the device
+     * for both read and write, but only actually do reading or writing.)
+     */
+
+    if ((mode & OPEN_WRITE) && (mode & OPEN_READ)) {
+        if (card->is_open_play)
+            mode = OPEN_WRITE;
+        else if (card->is_open_record)
+            mode = OPEN_READ;
+        else mode = 0;
+    }
+        
+    if (mode & OPEN_WRITE) {
+        if (card->is_open_play == 0) {
+            card->dev_for_play = dev;
+            card->is_open_play = 1;
+        }
+        else
+            return -EBUSY;
+    }
+
+    if (mode & OPEN_READ) {
+        if (card->is_open_record == 0) {
+            card->dev_for_record = dev;
+            card->is_open_record = 1;
+        }
+        else
+            return -EBUSY;
+    }
+
+    card->opencnt[w]++;
+    return 0;
+}
+
+/*
+ * Close the device
+ *
+ * DEV  - device
+ *
+ * Called when closing the DMAbuf               (dmabuf.c:477)
+ *      after halt_xfer
+ */
+static void
+nm256_audio_close(int dev)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+        
+    if (card != NULL) {
+        int w;
+
+        if (card->dev[0] == dev)
+            w = 0;
+        else if (card->dev[1] == dev)
+            w = 1;
+        else
+            return;
+
+        card->opencnt[w]--;
+        if (card->opencnt[w] <= 0) {
+            card->opencnt[w] = 0;
+
+            if (card->dev_for_play == dev) {
+                stopPlay (card);
+                card->is_open_play = 0;
+                card->dev_for_play = -1;
+            }
+
+            if (card->dev_for_record == dev) {
+                stopRecord (card);
+                card->is_open_record = 0;
+                card->dev_for_record = -1;
+            }
+        }
+    }
+}
+
+/* Standard ioctl handler. */
+static int
+nm256_audio_ioctl(int dev, unsigned int cmd, void __user *arg)
+{
+    int ret;
+    u32 oldinfo;
+    int w;
+
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card == NULL)
+        return -ENODEV;
+
+    if (dev == card->dev[0])
+        w = 0;
+    else
+        w = 1;
+
+    /* 
+     * The code here is messy.  There are probably better ways to do
+     * it.  (It should be possible to handle it the same way the AC97 mixer 
+     * is done.)
+     */
+    switch (cmd)
+        {
+        case SOUND_PCM_WRITE_RATE:
+            if (get_user(ret, (int __user *) arg))
+                return -EFAULT;
+
+            if (ret != 0) {
+                oldinfo = card->sinfo[w].samplerate;
+                card->sinfo[w].samplerate = ret;
+                ret = nm256_setInfo(dev, card);
+                if (ret != 0)
+                    card->sinfo[w].samplerate = oldinfo;
+            }
+            if (ret == 0)
+                ret = card->sinfo[w].samplerate;
+            break;
+
+        case SOUND_PCM_READ_RATE:
+            ret = card->sinfo[w].samplerate;
+            break;
+
+        case SNDCTL_DSP_STEREO:
+            if (get_user(ret, (int __user *) arg))
+                return -EFAULT;
+
+            card->sinfo[w].stereo = ret ? 1 : 0;
+            ret = nm256_setInfo (dev, card);
+            if (ret == 0)
+                ret = card->sinfo[w].stereo;
+
+            break;
+
+        case SOUND_PCM_WRITE_CHANNELS:
+            if (get_user(ret, (int __user *) arg))
+                return -EFAULT;
+
+            if (ret < 1 || ret > 3)
+                ret = card->sinfo[w].stereo + 1;
+            else {
+                card->sinfo[w].stereo = ret - 1;
+                ret = nm256_setInfo (dev, card);
+                if (ret == 0)
+                    ret = card->sinfo[w].stereo + 1;
+            }
+            break;
+
+        case SOUND_PCM_READ_CHANNELS:
+            ret = card->sinfo[w].stereo + 1;
+            break;
+
+        case SNDCTL_DSP_SETFMT:
+            if (get_user(ret, (int __user *) arg))
+                return -EFAULT;
+
+            if (ret != 0) {
+                oldinfo = card->sinfo[w].bits;
+                card->sinfo[w].bits = ret;
+                ret = nm256_setInfo (dev, card);
+                if (ret != 0)
+                    card->sinfo[w].bits = oldinfo;
+            }
+            if (ret == 0)
+                ret = card->sinfo[w].bits;
+            break;
+
+        case SOUND_PCM_READ_BITS:
+            ret = card->sinfo[w].bits;
+            break;
+
+        default:
+            return -EINVAL;
+        }
+    return put_user(ret, (int __user *) arg);
+}
+
+/*
+ * Given the sound device DEV and an associated physical buffer PHYSBUF, 
+ * return a pointer to the actual buffer in kernel space. 
+ *
+ * This routine should exist as part of the soundcore routines.
+ */
+
+static char *
+nm256_getDMAbuffer (int dev, unsigned long physbuf)
+{
+    struct audio_operations *adev = audio_devs[dev];
+    struct dma_buffparms *dmap = adev->dmap_out;
+    char *dma_start =
+        (char *)(physbuf - (unsigned long)dmap->raw_buf_phys 
+                 + (unsigned long)dmap->raw_buf);
+
+    return dma_start;
+}
+
+
+/*
+ * Output a block to sound device
+ *
+ * dev          - device number
+ * buf          - physical address of buffer
+ * total_count  - total byte count in buffer
+ * intrflag     - set if this has been called from an interrupt 
+ *                                (via DMAbuf_outputintr)
+ * restart_dma  - set if engine needs to be re-initialised
+ *
+ * Called when:
+ *  1. Starting output                                  (dmabuf.c:1327)
+ *  2.                                                  (dmabuf.c:1504)
+ *  3. A new buffer needs to be sent to the device      (dmabuf.c:1579)
+ */
+static void
+nm256_audio_output_block(int dev, unsigned long physbuf,
+                                       int total_count, int intrflag)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card != NULL) {
+        char *dma_buf = nm256_getDMAbuffer (dev, physbuf);
+        card->is_open_play = 1;
+        card->dev_for_play = dev;
+        nm256_write_block (card, dma_buf, total_count);
+    }
+}
+
+/* Ditto, but do recording instead.  */
+static void
+nm256_audio_start_input(int dev, unsigned long physbuf, int count,
+                        int intrflag)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card != NULL) {
+        char *dma_buf = nm256_getDMAbuffer (dev, physbuf);
+        card->is_open_record = 1;
+        card->dev_for_record = dev;
+        nm256_startRecording (card, dma_buf, count);
+    }
+}
+
+/* 
+ * Prepare for inputting samples to DEV. 
+ * Each requested buffer will be BSIZE byes long, with a total of
+ * BCOUNT buffers. 
+ */
+
+static int
+nm256_audio_prepare_for_input(int dev, int bsize, int bcount)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card == NULL) 
+        return -ENODEV;
+
+    if (card->is_open_record && card->dev_for_record != dev)
+        return -EBUSY;
+
+    audio_devs[dev]->dmap_in->flags |= DMA_NODMA;
+    return 0;
+}
+
+/*
+ * Prepare for outputting samples to `dev'
+ *
+ * Each buffer that will be passed will be `bsize' bytes long,
+ * with a total of `bcount' buffers.
+ *
+ * Called when:
+ *  1. A trigger enables audio output                   (dmabuf.c:978)
+ *  2. We get a write buffer without dma_mode setup     (dmabuf.c:1152)
+ *  3. We restart a transfer                            (dmabuf.c:1324)
+ */
+
+static int
+nm256_audio_prepare_for_output(int dev, int bsize, int bcount)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card == NULL)
+        return -ENODEV;
+
+    if (card->is_open_play && card->dev_for_play != dev)
+        return -EBUSY;
+
+    audio_devs[dev]->dmap_out->flags |= DMA_NODMA;
+    return 0;
+}
+
+/* Stop the current operations associated with DEV.  */
+static void
+nm256_audio_reset(int dev)
+{
+    struct nm256_info *card = nm256_find_card (dev);
+
+    if (card != NULL) {
+        if (card->dev_for_play == dev)
+            stopPlay (card);
+        if (card->dev_for_record == dev)
+            stopRecord (card);
+    }
+}
+
+static int
+nm256_audio_local_qlen(int dev)
+{
+    return 0;
+}
+
+static struct audio_driver nm256_audio_driver =
+{
+        .owner                  = THIS_MODULE,
+        .open                   = nm256_audio_open,
+        .close                  = nm256_audio_close,
+        .output_block           = nm256_audio_output_block,
+        .start_input            = nm256_audio_start_input,
+        .ioctl                  = nm256_audio_ioctl,
+        .prepare_for_input      = nm256_audio_prepare_for_input,
+        .prepare_for_output     = nm256_audio_prepare_for_output,
+        .halt_io                = nm256_audio_reset,
+        .local_qlen             = nm256_audio_local_qlen,
+};
+
+static struct pci_device_id nm256_pci_tbl[] = {
+        {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO,
+        PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+        {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO,
+        PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+        {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO,
+        PCI_ANY_ID, PCI_ANY_ID, 0, 0},
+        {0,}
+};
+MODULE_DEVICE_TABLE(pci, nm256_pci_tbl);
+MODULE_LICENSE("GPL");
+
+
+static struct pci_driver nm256_pci_driver = {
+        .name           = "nm256_audio",
+        .id_table       = nm256_pci_tbl,
+        .probe          = nm256_probe,
+        .remove         = nm256_remove,
+};
+
+module_param(usecache, bool, 0);
+module_param(buffertop, int, 0);
+module_param(nm256_debug, bool, 0644);
+module_param(force_load, bool, 0);
+
+static int __init do_init_nm256(void)
+{
+    printk (KERN_INFO "NeoMagic 256AV/256ZX audio driver, version 1.1p\n");
+    return pci_module_init(&nm256_pci_driver);
+}
+
+static void __exit cleanup_nm256 (void)
+{
+    pci_unregister_driver(&nm256_pci_driver);
+    pm_unregister_all (&handle_pm_event);
+}
+
+module_init(do_init_nm256);
+module_exit(cleanup_nm256);
+
+/*
+ * Local variables:
+ *  c-basic-offset: 4
+ * End:
+ */