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nm256_audio.c
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/*
* 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/delay.h>
#include <linux/spinlock.h>
#include "sound_config.h"
static int nm256_debug;
static int force_load;
#include "nm256.h"
#include "nm256_coeff.h"
/*
* 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);
/* 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. */
static 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;
}
/*
* 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)
{