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Subjecti810 audio patch
this patch is slightly differerent from the last one i posted.

it's still diffed against 2.4.17pre1. one obvious thinko is fixed, and a
couple lines that looked bad to me have been changed (goto end in
i810_read seems to be necessary to clean up the wait queue unless I'm
mistaken), and I'm no longer reproducing any OOPSes.

however, i am seeing artsd segfault occasionally. this also seems to
happen with the 4Front driver, however, at least if I load 4Front's
module after unloading this patched driver. I'm not sure if this is a
bug in artsd or specific to my setup or something nasty i've done to my
kernel's data structures ;) so maybe somebody else who's still having
problems with 2.4.17pre1 and KDE can take a look and see how it works
for them.
--- i810_audio.c.17p1 Mon Dec 3 14:14:40 2001
+++ linux/drivers/sound/i810_audio.c Mon Dec 3 19:06:33 2001
@@ -197,7 +197,7 @@
#define INT_MASK (INT_SEC|INT_PRI|INT_MC|INT_PO|INT_PI|INT_MO|INT_NI|INT_GPI)


-#define DRIVER_VERSION "0.04"
+#define DRIVER_VERSION "0.05b"

/* magic numbers to protect our data structures */
#define I810_CARD_MAGIC 0x5072696E /* "Prin" */
@@ -357,6 +357,10 @@
struct i810_channel *(*alloc_rec_pcm_channel)(struct i810_card *);
struct i810_channel *(*alloc_rec_mic_channel)(struct i810_card *);
void (*free_pcm_channel)(struct i810_card *, int chan);
+
+ /* We have a *very* long init time possibly, so use this to block */
+ /* attempts to open our devices before we are ready (stops oops'es) */
+ int initializing;
};

static struct i810_card *devs = NULL;
@@ -364,32 +368,6 @@
static int i810_open_mixdev(struct inode *inode, struct file *file);
static int i810_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg);
-
-static inline unsigned ld2(unsigned int x)
-{
- unsigned r = 0;
-
- if (x >= 0x10000) {
- x >>= 16;
- r += 16;
- }
- if (x >= 0x100) {
- x >>= 8;
- r += 8;
- }
- if (x >= 0x10) {
- x >>= 4;
- r += 4;
- }
- if (x >= 4) {
- x >>= 2;
- r += 2;
- }
- if (x >= 2)
- r++;
- return r;
-}
-
static u16 i810_ac97_get(struct ac97_codec *dev, u8 reg);
static void i810_ac97_set(struct ac97_codec *dev, u8 reg, u16 data);

@@ -969,14 +947,6 @@
else
port += dmabuf->write_channel->port;

- if(dmabuf->mapped) {
- if(rec)
- dmabuf->swptr = (dmabuf->hwptr + dmabuf->dmasize
- - dmabuf->count) % dmabuf->dmasize;
- else
- dmabuf->swptr = (dmabuf->hwptr + dmabuf->count)
- % dmabuf->dmasize;
- }
/*
* two special cases, count == 0 on write
* means no data, and count == dmasize
@@ -993,7 +963,7 @@
/* swptr - 1 is the tail of our transfer */
x = (dmabuf->dmasize + dmabuf->swptr - 1) % dmabuf->dmasize;
x /= dmabuf->fragsize;
- outb(x&31, port+OFF_LVI);
+ outb(x, port+OFF_LVI);
}

static void i810_update_lvi(struct i810_state *state, int rec)
@@ -1020,7 +990,9 @@
/* update hardware pointer */
hwptr = i810_get_dma_addr(state, 1);
diff = (dmabuf->dmasize + hwptr - dmabuf->hwptr) % dmabuf->dmasize;
-// printk("HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
+#ifdef DEBUG_INTERRUPTS
+ printk("ADC HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
+#endif
dmabuf->hwptr = hwptr;
dmabuf->total_bytes += diff;
dmabuf->count += diff;
@@ -1043,7 +1015,9 @@
/* update hardware pointer */
hwptr = i810_get_dma_addr(state, 0);
diff = (dmabuf->dmasize + hwptr - dmabuf->hwptr) % dmabuf->dmasize;
-// printk("HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
+#ifdef DEBUG_INTERRUPTS
+ printk("DAC HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
+#endif
dmabuf->hwptr = hwptr;
dmabuf->total_bytes += diff;
dmabuf->count -= diff;
@@ -1068,6 +1042,40 @@
}
}

+static inline int i810_get_free_write_space(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ int free;
+
+ i810_update_ptr(state);
+ // catch underruns during playback
+ if (dmabuf->count < 0) {
+ dmabuf->count = 0;
+ }
+ free = dmabuf->dmasize - dmabuf->count;
+ free -= (dmabuf->hwptr % dmabuf->fragsize);
+ if(free < 0)
+ return(0);
+ return(free);
+}
+
+static inline int i810_get_available_read_data(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ int avail;
+
+ i810_update_ptr(state);
+ // catch overruns during record
+ if (dmabuf->count > dmabuf->dmasize) {
+ dmabuf->count = dmabuf->dmasize;
+ }
+ avail = dmabuf->count;
+ avail -= (dmabuf->hwptr % dmabuf->fragsize);
+ if(avail < 0)
+ return(0);
+ return(avail);
+}
+
static int drain_dac(struct i810_state *state, int nonblock)
{
DECLARE_WAITQUEUE(wait, current);
@@ -1271,10 +1279,7 @@
continue;
}
swptr = dmabuf->swptr;
- if (dmabuf->count > dmabuf->dmasize) {
- dmabuf->count = dmabuf->dmasize;
- }
- cnt = dmabuf->count - dmabuf->fragsize;
+ cnt = i810_get_available_read_data(state);
// this is to make the copy_to_user simpler below
if(cnt > (dmabuf->dmasize - swptr))
cnt = dmabuf->dmasize - swptr;
@@ -1291,7 +1296,7 @@
i810_update_lvi(state,1);
if (file->f_flags & O_NONBLOCK) {
if (!ret) ret = -EAGAIN;
- return ret;
+ goto done;
}
/* This isnt strictly right for the 810 but it'll do */
tmo = (dmabuf->dmasize * HZ) / (dmabuf->rate * 2);
@@ -1315,7 +1320,7 @@
}
if (signal_pending(current)) {
ret = ret ? ret : -ERESTARTSYS;
- return ret;
+ goto done;
}
continue;
}
@@ -1402,10 +1407,7 @@
}

swptr = dmabuf->swptr;
- if (dmabuf->count < 0) {
- dmabuf->count = 0;
- }
- cnt = dmabuf->dmasize - swptr;
+ cnt = i810_get_free_write_space(state);
if(cnt > (dmabuf->dmasize - dmabuf->count))
cnt = dmabuf->dmasize - dmabuf->count;
spin_unlock_irqrestore(&state->card->lock, flags);
@@ -1508,13 +1510,8 @@
mask |= POLLIN | POLLRDNORM;
}
if (file->f_mode & FMODE_WRITE && dmabuf->enable & DAC_RUNNING) {
- if (dmabuf->mapped) {
- if (dmabuf->count >= (signed)dmabuf->fragsize)
- mask |= POLLOUT | POLLWRNORM;
- } else {
- if ((signed)dmabuf->dmasize >= dmabuf->count + (signed)dmabuf->fragsize)
- mask |= POLLOUT | POLLWRNORM;
- }
+ if ((signed)dmabuf->dmasize >= dmabuf->count + (signed)dmabuf->fragsize)
+ mask |= POLLOUT | POLLWRNORM;
}
spin_unlock_irqrestore(&state->card->lock, flags);

@@ -1559,10 +1556,7 @@
size, vma->vm_page_prot))
goto out;
dmabuf->mapped = 1;
- if(vma->vm_flags & VM_WRITE)
- dmabuf->count = dmabuf->dmasize;
- else
- dmabuf->count = 0;
+ dmabuf->count = 0;
ret = 0;
#ifdef DEBUG
printk("i810_audio: mmap'ed %ld bytes of data space\n", size);
@@ -1580,11 +1574,9 @@
audio_buf_info abinfo;
count_info cinfo;
unsigned int i_glob_cnt;
- int val = 0, mapped, ret;
+ int val = 0, ret;
struct ac97_codec *codec = state->card->ac97_codec[0];

- mapped = ((file->f_mode & FMODE_WRITE) && dmabuf->mapped) ||
- ((file->f_mode & FMODE_READ) && dmabuf->mapped);
#ifdef DEBUG
printk("i810_audio: i810_ioctl, arg=0x%x, cmd=", arg ? *(int *)arg : 0);
#endif
@@ -1674,9 +1666,6 @@
#ifdef DEBUG
printk("SNDCTL_DSP_STEREO\n");
#endif
- if (get_user(val, (int *)arg))
- return -EFAULT;
-
if (dmabuf->enable & DAC_RUNNING) {
stop_dac(state);
}
@@ -1820,22 +1809,47 @@

dmabuf->ossfragsize = 1<<(val & 0xffff);
dmabuf->ossmaxfrags = (val >> 16) & 0xffff;
- if (dmabuf->ossmaxfrags <= 4)
- dmabuf->ossmaxfrags = 4;
- else if (dmabuf->ossmaxfrags <= 8)
- dmabuf->ossmaxfrags = 8;
- else if (dmabuf->ossmaxfrags <= 16)
- dmabuf->ossmaxfrags = 16;
- else
- dmabuf->ossmaxfrags = 32;
+ if (!dmabuf->ossfragsize || !dmabuf->ossmaxfrags)
+ return -EINVAL;
+ /*
+ * Bound the frag size into our allowed range of 256 - 4096
+ */
+ if (dmabuf->ossfragsize < 256)
+ dmabuf->ossfragsize = 256;
+ else if (dmabuf->ossfragsize > 4096)
+ dmabuf->ossfragsize = 4096;
+ /*
+ * The numfrags could be something reasonable, or it could
+ * be 0xffff meaning "Give me as much as possible". So,
+ * we check the numfrags * fragsize doesn't exceed our
+ * 64k buffer limit, nor is it less than our 8k minimum.
+ * If it fails either one of these checks, then adjust the
+ * number of fragments, not the size of them. It's OK if
+ * our number of fragments doesn't equal 32 or anything
+ * like our hardware based number now since we are using
+ * a different frag count for the hardware. Before we get
+ * into this though, bound the maxfrags to avoid overflow
+ * issues. A reasonable bound would be 64k / 256 since our
+ * maximum buffer size is 64k and our minimum frag size is
+ * 256. On the other end, our minimum buffer size is 8k and
+ * our maximum frag size is 4k, so the lower bound should
+ * be 2.
+ */
+
+ if(dmabuf->ossmaxfrags > 256)
+ dmabuf->ossmaxfrags = 256;
+ else if (dmabuf->ossmaxfrags < 2)
+ dmabuf->ossmaxfrags = 2;
+
val = dmabuf->ossfragsize * dmabuf->ossmaxfrags;
- if (val < 16384)
- val = 16384;
- if (val > 65536)
- val = 65536;
- dmabuf->ossmaxfrags = val/dmabuf->ossfragsize;
- if(dmabuf->ossmaxfrags<4)
- dmabuf->ossfragsize = val/4;
+ while (val < 8192) {
+ val <<= 1;
+ dmabuf->ossmaxfrags <<= 1;
+ }
+ while (val > 65536) {
+ val >>= 1;
+ dmabuf->ossmaxfrags >>= 1;
+ }
dmabuf->ready = 0;
#ifdef DEBUG
printk("SNDCTL_DSP_SETFRAGMENT 0x%x, %d, %d\n", val,
@@ -1853,10 +1867,10 @@
i810_update_ptr(state);
abinfo.fragsize = dmabuf->userfragsize;
abinfo.fragstotal = dmabuf->userfrags;
- if(dmabuf->mapped)
- abinfo.bytes = dmabuf->count;
- else
- abinfo.bytes = dmabuf->dmasize - dmabuf->fragsize - dmabuf->count;
+ if (dmabuf->mapped)
+ abinfo.bytes = dmabuf->dmasize;
+ else
+ abinfo.bytes = i810_get_free_write_space(state);
abinfo.fragments = abinfo.bytes / dmabuf->userfragsize;
spin_unlock_irqrestore(&state->card->lock, flags);
#ifdef DEBUG
@@ -1871,13 +1885,13 @@
if (!dmabuf->ready && (val = prog_dmabuf(state, 0)) != 0)
return val;
spin_lock_irqsave(&state->card->lock, flags);
- i810_update_ptr(state);
+ val = i810_get_free_write_space(state);
cinfo.bytes = dmabuf->total_bytes;
cinfo.ptr = dmabuf->hwptr;
- cinfo.blocks = (dmabuf->dmasize - dmabuf->count)/dmabuf->userfragsize;
- if (dmabuf->mapped) {
- dmabuf->count = (dmabuf->dmasize -
- (dmabuf->count & (dmabuf->userfragsize-1)));
+ cinfo.blocks = val/dmabuf->userfragsize;
+ if (dmabuf->mapped && dmabuf->enable && DAC_RUNNING) {
+ dmabuf->count += val;
+ dmabuf->swptr = (dmabuf->swptr + val) % dmabuf->dmasize;
__i810_update_lvi(state, 0);
}
spin_unlock_irqrestore(&state->card->lock, flags);
@@ -1893,10 +1907,9 @@
if (!dmabuf->ready && (val = prog_dmabuf(state, 1)) != 0)
return val;
spin_lock_irqsave(&state->card->lock, flags);
- i810_update_ptr(state);
+ abinfo.bytes = i810_get_available_read_data(state);
abinfo.fragsize = dmabuf->userfragsize;
abinfo.fragstotal = dmabuf->userfrags;
- abinfo.bytes = dmabuf->dmasize - dmabuf->count;
abinfo.fragments = abinfo.bytes / dmabuf->userfragsize;
spin_unlock_irqrestore(&state->card->lock, flags);
#ifdef DEBUG
@@ -1911,12 +1924,13 @@
if (!dmabuf->ready && (val = prog_dmabuf(state, 0)) != 0)
return val;
spin_lock_irqsave(&state->card->lock, flags);
- i810_update_ptr(state);
+ val = i810_get_available_read_data(state);
cinfo.bytes = dmabuf->total_bytes;
- cinfo.blocks = dmabuf->count/dmabuf->userfragsize;
+ cinfo.blocks = val/dmabuf->userfragsize;
cinfo.ptr = dmabuf->hwptr;
- if (dmabuf->mapped) {
- dmabuf->count &= (dmabuf->userfragsize-1);
+ if (dmabuf->mapped && dmabuf->enable && ADC_RUNNING) {
+ dmabuf->count -= val;
+ dmabuf->swptr = (dmabuf->swptr + val) % dmabuf->dmasize;
__i810_update_lvi(state, 1);
}
spin_unlock_irqrestore(&state->card->lock, flags);
@@ -1970,8 +1984,12 @@
if (!dmabuf->ready && (ret = prog_dmabuf(state, 0)))
return ret;
if (dmabuf->mapped) {
- dmabuf->count = dmabuf->dmasize;
- i810_update_lvi(state,0);
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ dmabuf->count = 0;
+ dmabuf->count = i810_get_free_write_space(state);
+ __i810_update_lvi(state, 0);
+ spin_unlock_irqrestore(&state->card->lock, flags);
}
if (!dmabuf->enable && dmabuf->count > dmabuf->userfragsize)
start_dac(state);
@@ -1985,10 +2003,6 @@
}
if (!dmabuf->ready && (ret = prog_dmabuf(state, 1)))
return ret;
- if (dmabuf->mapped) {
- dmabuf->count = 0;
- i810_update_lvi(state,1);
- }
if (!dmabuf->enable && dmabuf->count <
(dmabuf->dmasize - dmabuf->userfragsize))
start_adc(state);
@@ -2195,7 +2209,11 @@

/* find an avaiable virtual channel (instance of /dev/dsp) */
while (card != NULL) {
- for (i = 0; i < NR_HW_CH; i++) {
+ for (i = 0; i < 50 && card->initializing; i++) {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ/20);
+ }
+ for (i = 0; i < NR_HW_CH && !card->initializing; i++) {
if (card->states[i] == NULL) {
state = card->states[i] = (struct i810_state *)
kmalloc(sizeof(struct i810_state), GFP_KERNEL);
@@ -2344,13 +2362,18 @@
int minor = MINOR(inode->i_rdev);
struct i810_card *card = devs;

- for (card = devs; card != NULL; card = card->next)
- for (i = 0; i < NR_AC97; i++)
+ for (card = devs; card != NULL; card = card->next) {
+ for (i = 0; i < 50 && card->initializing; i++) {
+ current->state = TASK_UNINTERRUPTIBLE;
+ schedule_timeout(HZ/20);
+ }
+ for (i = 0; i < NR_AC97 && !card->initializing; i++)
if (card->ac97_codec[i] != NULL &&
card->ac97_codec[i]->dev_mixer == minor) {
file->private_data = card->ac97_codec[i];
return 0;
}
+ }
return -ENODEV;
}

@@ -2696,6 +2719,7 @@
}
memset(card, 0, sizeof(*card));

+ card->initializing = 1;
card->iobase = pci_resource_start (pci_dev, 1);
card->ac97base = pci_resource_start (pci_dev, 0);
card->pci_dev = pci_dev;
@@ -2771,7 +2795,7 @@
kfree(card);
return -ENODEV;
}
-
+ card->initializing = 0;
return 0;
}

@@ -2789,6 +2813,7 @@
if (card->ac97_codec[i] != NULL) {
unregister_sound_mixer(card->ac97_codec[i]->dev_mixer);
kfree (card->ac97_codec[i]);
+ card->ac97_codec[i] = NULL;
}
unregister_sound_dsp(card->dev_audio);
kfree(card);
@@ -2957,9 +2982,6 @@
if(ftsodell != 0) {
printk("i810_audio: ftsodell is now a deprecated option.\n");
}
- if(clocking == 48000) {
- i810_configure_clocking();
- }
if(spdif_locked > 0 ) {
if(spdif_locked == 32000 || spdif_locked == 44100 || spdif_locked == 48000) {
printk("i810_audio: Enabling S/PDIF at sample rate %dHz.\n", spdif_locked);
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