1 files changed, 241 insertions, 243 deletions

diff --git a/drivers/media/video/saa7134/saa7134-alsa.c b/drivers/media/video/saa7134/saa7134-alsa.c
index 4f3c42354329..ade05f75fdb0 100644
--- a/drivers/media/video/saa7134/saa7134-alsa.c
+++ b/drivers/media/video/saa7134/saa7134-alsa.c
@@ -30,7 +30,9 @@
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/pcm.h>
+#include <sound/pcm_params.h>
 #include <sound/initval.h>
+#include <linux/interrupt.h>
 
 #include "saa7134.h"
 #include "saa7134-reg.h"
@@ -49,6 +51,7 @@ MODULE_PARM_DESC(debug,"enable debug messages [alsa]");
 #define MIXER_ADDR_LINE2        2
 #define MIXER_ADDR_LAST         2
 
+
 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 0};
@@ -57,18 +60,21 @@ module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for SAA7134 capture interface(s).");
 
 #define dprintk(fmt, arg...)    if (debug) \
-        printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
+        printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ##arg)
+
+
 
 /*
  * Main chip structure
  */
+
 typedef struct snd_card_saa7134 {
         snd_card_t *card;
         spinlock_t mixer_lock;
         int mixer_volume[MIXER_ADDR_LAST+1][2];
         int capture_source[MIXER_ADDR_LAST+1][2];
         struct pci_dev *pci;
-        struct saa7134_dev *saadev;
+        struct saa7134_dev *dev;
 
         unsigned long iobase;
         int irq;
@@ -83,12 +89,10 @@ typedef struct snd_card_saa7134 {
  */
 
 typedef struct snd_card_saa7134_pcm {
-        struct saa7134_dev *saadev;
+        struct saa7134_dev *dev;
 
         spinlock_t lock;
-        unsigned int pcm_size;          /* buffer size */
-        unsigned int pcm_count;         /* bytes per period */
-        unsigned int pcm_bps;           /* bytes per second */
+
         snd_pcm_substream_t *substream;
 } snd_card_saa7134_pcm_t;
 
@@ -100,13 +104,11 @@ static snd_card_t *snd_saa7134_cards[SNDRV_CARDS];
  *
  *   Called when the capture device is released or the buffer overflows
  *
- *   - Copied verbatim from saa7134-oss's dsp_dma_stop. Can be dropped
- *     if we just share dsp_dma_stop and use it here
+ *   - Copied verbatim from saa7134-oss's dsp_dma_stop.
  *
  */
 
 static void saa7134_dma_stop(struct saa7134_dev *dev)
-
 {
         dev->dmasound.dma_blk     = -1;
         dev->dmasound.dma_running = 0;
@@ -118,8 +120,7 @@ static void saa7134_dma_stop(struct saa7134_dev *dev)
  *
  *   Called when preparing the capture device for use
  *
- *   - Copied verbatim from saa7134-oss's dsp_dma_start. Can be dropped
- *     if we just share dsp_dma_start and use it here
+ *   - Copied verbatim from saa7134-oss's dsp_dma_start.
  *
  */
 
@@ -141,7 +142,8 @@ static void saa7134_dma_start(struct saa7134_dev *dev)
  *
  */
 
-void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
+static void saa7134_irq_alsa_done(struct saa7134_dev *dev,
+                                  unsigned long status)
 {
         int next_blk, reg = 0;
 
@@ -170,9 +172,9 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
         if (dev->dmasound.read_count >= dev->dmasound.blksize * (dev->dmasound.blocks-2)) {
                 dprintk("irq: overrun [full=%d/%d] - Blocks in %d\n",dev->dmasound.read_count,
                         dev->dmasound.bufsize, dev->dmasound.blocks);
+                spin_unlock(&dev->slock);
                 snd_pcm_stop(dev->dmasound.substream,SNDRV_PCM_STATE_XRUN);
-                saa7134_dma_stop(dev);
-                goto done;
+                return;
         }
 
         /* next block addr */
@@ -194,6 +196,7 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
                 snd_pcm_period_elapsed(dev->dmasound.substream);
                 spin_lock(&dev->slock);
         }
+
  done:
         spin_unlock(&dev->slock);
 
@@ -209,7 +212,9 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
 
 static irqreturn_t saa7134_alsa_irq(int irq, void *dev_id, struct pt_regs *regs)
 {
-        struct saa7134_dev *dev = (struct saa7134_dev*) dev_id;
+        struct saa7134_dmasound *dmasound = dev_id;
+        struct saa7134_dev *dev = dmasound->priv_data;
+
         unsigned long report, status;
         int loop, handled = 0;
 
@@ -248,56 +253,23 @@ static int snd_card_saa7134_capture_trigger(snd_pcm_substream_t * substream,
                                           int cmd)
 {
         snd_pcm_runtime_t *runtime = substream->runtime;
-        snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
-        struct saa7134_dev *dev=saapcm->saadev;
+        snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+        struct saa7134_dev *dev=pcm->dev;
         int err = 0;
 
-        spin_lock_irq(&dev->slock);
-        if (cmd == SNDRV_PCM_TRIGGER_START) {
+        spin_lock(&dev->slock);
+        if (cmd == SNDRV_PCM_TRIGGER_START) {
                 /* start dma */
                 saa7134_dma_start(dev);
-        } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
+        } else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
                 /* stop dma */
                 saa7134_dma_stop(dev);
-        } else {
-                err = -EINVAL;
-        }
-        spin_unlock_irq(&dev->slock);
-
-        return err;
-}
-
-/*
- * DMA buffer config
- *
- *   Sets the values that will later be used as the size of the buffer,
- *  size of the fragments, and total number of fragments.
- *   Must be called during the preparation stage, before memory is
- *  allocated
- *
- *   - Copied verbatim from saa7134-oss. Can be dropped
- *     if we just share dsp_buffer_conf from OSS.
- */
+        } else {
+                err = -EINVAL;
+        }
+        spin_unlock(&dev->slock);
 
-static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
-{
-        if (blksize < 0x100)
-                blksize = 0x100;
-        if (blksize > 0x10000)
-                blksize = 0x10000;
-
-        if (blocks < 2)
-                blocks = 2;
-        if ((blksize * blocks) > 1024*1024)
-                blocks = 1024*1024 / blksize;
-
-        dev->dmasound.blocks  = blocks;
-        dev->dmasound.blksize = blksize;
-        dev->dmasound.bufsize = blksize * blocks;
-
-        dprintk("buffer config: %d blocks / %d bytes, %d kB total\n",
-                blocks,blksize,blksize * blocks / 1024);
-        return 0;
+        return err;
 }
 
 /*
@@ -307,16 +279,16 @@ static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
  *  ALSA, but I was unable to use ALSA's own DMA, and had to force the
  *  usage of V4L's
  *
- *   - Copied verbatim from saa7134-oss. Can be dropped
- *     if we just share dsp_buffer_init from OSS.
+ *   - Copied verbatim from saa7134-oss.
+ *
  */
 
 static int dsp_buffer_init(struct saa7134_dev *dev)
 {
         int err;
 
-        if (!dev->dmasound.bufsize)
-                BUG();
+        BUG_ON(!dev->dmasound.bufsize);
+
         videobuf_dma_init(&dev->dmasound.dma);
         err = videobuf_dma_init_kernel(&dev->dmasound.dma, PCI_DMA_FROMDEVICE,
                                        (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
@@ -326,6 +298,28 @@ static int dsp_buffer_init(struct saa7134_dev *dev)
 }
 
 /*
+ * DMA buffer release
+ *
+ *   Called after closing the device, during snd_card_saa7134_capture_close
+ *
+ */
+
+static int dsp_buffer_free(struct saa7134_dev *dev)
+{
+        if (!dev->dmasound.blksize)
+                BUG();
+
+        videobuf_dma_free(&dev->dmasound.dma);
+
+        dev->dmasound.blocks  = 0;
+        dev->dmasound.blksize = 0;
+        dev->dmasound.bufsize = 0;
+
+       return 0;
+}
+
+
+/*
  * ALSA PCM preparation
  *
  *   - One of the ALSA capture callbacks.
@@ -340,84 +334,30 @@ static int dsp_buffer_init(struct saa7134_dev *dev)
 static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
 {
         snd_pcm_runtime_t *runtime = substream->runtime;
-        int err, bswap, sign;
+        int bswap, sign;
         u32 fmt, control;
         snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
         struct saa7134_dev *dev;
-        snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
-        unsigned int bps;
-        unsigned long size;
-        unsigned count;
+        snd_card_saa7134_pcm_t *pcm = runtime->private_data;
 
-        size = snd_pcm_lib_buffer_bytes(substream);
-        count = snd_pcm_lib_period_bytes(substream);
-
-        saapcm->saadev->dmasound.substream = substream;
-        bps = runtime->rate * runtime->channels;
-        bps *= snd_pcm_format_width(runtime->format);
-        bps /= 8;
-        if (bps <= 0)
-                return -EINVAL;
-        saapcm->pcm_bps = bps;
-        saapcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
-        saapcm->pcm_count = snd_pcm_lib_period_bytes(substream);
-
-
-        dev=saa7134->saadev;
-
-        dsp_buffer_conf(dev,saapcm->pcm_count,(saapcm->pcm_size/saapcm->pcm_count));
-
-        err = dsp_buffer_init(dev);
-        if (0 != err)
-                goto fail2;
-
-        /* prepare buffer */
-        if (0 != (err = videobuf_dma_pci_map(dev->pci,&dev->dmasound.dma)))
-                return err;
-        if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->dmasound.pt)))
-                goto fail1;
-        if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->dmasound.pt,
-                                              dev->dmasound.dma.sglist,
-                                              dev->dmasound.dma.sglen,
-                                              0)))
-                goto fail2;
+        pcm->dev->dmasound.substream = substream;
 
+        dev = saa7134->dev;
 
-
-        switch (runtime->format) {
-          case SNDRV_PCM_FORMAT_U8:
-          case SNDRV_PCM_FORMAT_S8:
+        if (snd_pcm_format_width(runtime->format) == 8)
                 fmt = 0x00;
-                break;
-          case SNDRV_PCM_FORMAT_U16_LE:
-          case SNDRV_PCM_FORMAT_U16_BE:
-          case SNDRV_PCM_FORMAT_S16_LE:
-          case SNDRV_PCM_FORMAT_S16_BE:
+        else
                 fmt = 0x01;
-                break;
-          default:
-                err = -EINVAL;
-                return 1;
-        }
 
-        switch (runtime->format) {
-          case SNDRV_PCM_FORMAT_S8:
-          case SNDRV_PCM_FORMAT_S16_LE:
-          case SNDRV_PCM_FORMAT_S16_BE:
+        if (snd_pcm_format_signed(runtime->format))
                 sign = 1;
-                break;
-          default:
+        else
                 sign = 0;
-                break;
-        }
 
-        switch (runtime->format) {
-          case SNDRV_PCM_FORMAT_U16_BE:
-          case SNDRV_PCM_FORMAT_S16_BE:
-                bswap = 1; break;
-          default:
-                bswap = 0; break;
-        }
+        if (snd_pcm_format_big_endian(runtime->format))
+                bswap = 1;
+        else
+                bswap = 0;
 
         switch (dev->pci->device) {
           case PCI_DEVICE_ID_PHILIPS_SAA7134:
@@ -445,7 +385,6 @@ static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
                         fmt |= 0x04;
                 saa_writel(SAA7133_NUM_SAMPLES, dev->dmasound.blksize -1);
                 saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
-                //saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210);
                 break;
         }
 
@@ -459,12 +398,6 @@ static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
         if (bswap)
                 control |= SAA7134_RS_CONTROL_BSWAP;
 
-        /* I should be able to use runtime->dma_addr in the control
-           byte, but it doesn't work. So I allocate the DMA using the
-           V4L functions, and force ALSA to use that as the DMA area */
-
-        runtime->dma_area = dev->dmasound.dma.vmalloc;
-
         saa_writel(SAA7134_RS_BA1(6),0);
         saa_writel(SAA7134_RS_BA2(6),dev->dmasound.blksize);
         saa_writel(SAA7134_RS_PITCH(6),0);
@@ -473,12 +406,6 @@ static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
         dev->dmasound.rate = runtime->rate;
 
         return 0;
- fail2:
-        saa7134_pgtable_free(dev->pci,&dev->dmasound.pt);
- fail1:
-        videobuf_dma_pci_unmap(dev->pci,&dev->dmasound.dma);
-        return err;
-
 
 }
 
@@ -496,10 +423,8 @@ static int snd_card_saa7134_capture_prepare(snd_pcm_substream_t * substream)
 static snd_pcm_uframes_t snd_card_saa7134_capture_pointer(snd_pcm_substream_t * substream)
 {
         snd_pcm_runtime_t *runtime = substream->runtime;
-        snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
-        struct saa7134_dev *dev=saapcm->saadev;
-
-
+        snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+        struct saa7134_dev *dev=pcm->dev;
 
         if (dev->dmasound.read_count) {
                 dev->dmasound.read_count  -= snd_pcm_lib_period_bytes(substream);
@@ -540,9 +465,9 @@ static snd_pcm_hardware_t snd_card_saa7134_capture =
 
 static void snd_card_saa7134_runtime_free(snd_pcm_runtime_t *runtime)
 {
-        snd_card_saa7134_pcm_t *saapcm = runtime->private_data;
+        snd_card_saa7134_pcm_t *pcm = runtime->private_data;
 
-        kfree(saapcm);
+        kfree(pcm);
 }
 
 
@@ -552,17 +477,76 @@ static void snd_card_saa7134_runtime_free(snd_pcm_runtime_t *runtime)
  *   - One of the ALSA capture callbacks.
  *
  *   Called on initialization, right before the PCM preparation
- *   Usually used in ALSA to allocate the DMA, but since we don't use the
- *  ALSA DMA it does nothing
  *
  */
 
 static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
                                     snd_pcm_hw_params_t * hw_params)
 {
+        snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+        struct saa7134_dev *dev;
+        unsigned int period_size, periods;
+        int err;
 
-        return 0;
+        period_size = params_period_bytes(hw_params);
+        periods = params_periods(hw_params);
+
+        snd_assert(period_size >= 0x100 && period_size <= 0x10000,
+                   return -EINVAL);
+        snd_assert(periods >= 2, return -EINVAL);
+        snd_assert(period_size * periods <= 1024 * 1024, return -EINVAL);
+
+        dev = saa7134->dev;
+
+        if (dev->dmasound.blocks == periods &&
+            dev->dmasound.blksize == period_size)
+                return 0;
 
+        /* release the old buffer */
+        if (substream->runtime->dma_area) {
+                saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+                videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
+                dsp_buffer_free(dev);
+                substream->runtime->dma_area = NULL;
+        }
+        dev->dmasound.blocks  = periods;
+        dev->dmasound.blksize = period_size;
+        dev->dmasound.bufsize = period_size * periods;
+
+        err = dsp_buffer_init(dev);
+        if (0 != err) {
+                dev->dmasound.blocks  = 0;
+                dev->dmasound.blksize = 0;
+                dev->dmasound.bufsize = 0;
+                return err;
+        }
+
+        if (0 != (err = videobuf_dma_pci_map(dev->pci, &dev->dmasound.dma))) {
+                dsp_buffer_free(dev);
+                return err;
+        }
+        if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->dmasound.pt))) {
+                videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
+                dsp_buffer_free(dev);
+                return err;
+        }
+        if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->dmasound.pt,
+                                                dev->dmasound.dma.sglist,
+                                                dev->dmasound.dma.sglen,
+                                                0))) {
+                saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+                videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
+                dsp_buffer_free(dev);
+                return err;
+        }
+
+        /* I should be able to use runtime->dma_addr in the control
+           byte, but it doesn't work. So I allocate the DMA using the
+           V4L functions, and force ALSA to use that as the DMA area */
+
+        substream->runtime->dma_area = dev->dmasound.dma.vmalloc;
+
+        return 1;
 
 }
 
@@ -572,33 +556,23 @@ static int snd_card_saa7134_hw_params(snd_pcm_substream_t * substream,
  *   - One of the ALSA capture callbacks.
  *
  *   Called after closing the device, but before snd_card_saa7134_capture_close
- *   Usually used in ALSA to free the DMA, but since we don't use the
- *  ALSA DMA I'm almost sure this isn't necessary.
+ *   It stops the DMA audio and releases the buffers.
  *
  */
 
 static int snd_card_saa7134_hw_free(snd_pcm_substream_t * substream)
 {
-        return 0;
-}
-
-/*
- * DMA buffer release
- *
- *   Called after closing the device, during snd_card_saa7134_capture_close
- *
- */
+        snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+        struct saa7134_dev *dev;
 
-static int dsp_buffer_free(struct saa7134_dev *dev)
-{
-        if (!dev->dmasound.blksize)
-                BUG();
+        dev = saa7134->dev;
 
-        videobuf_dma_free(&dev->dmasound.dma);
-
-        dev->dmasound.blocks  = 0;
-        dev->dmasound.blksize = 0;
-        dev->dmasound.bufsize = 0;
+        if (substream->runtime->dma_area) {
+                saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+                videobuf_dma_pci_unmap(dev->pci, &dev->dmasound.dma);
+                dsp_buffer_free(dev);
+                substream->runtime->dma_area = NULL;
+        }
 
         return 0;
 }
@@ -608,21 +582,12 @@ static int dsp_buffer_free(struct saa7134_dev *dev)
  *
  *   - One of the ALSA capture callbacks.
  *
- *   Called after closing the device. It stops the DMA audio and releases
- *  the buffers
+ *   Called after closing the device.
  *
  */
 
 static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
 {
-        snd_card_saa7134_t *chip = snd_pcm_substream_chip(substream);
-        struct saa7134_dev *dev = chip->saadev;
-
-        /* unlock buffer */
-        saa7134_pgtable_free(dev->pci,&dev->dmasound.pt);
-        videobuf_dma_pci_unmap(dev->pci,&dev->dmasound.dma);
-
-        dsp_buffer_free(dev);
         return 0;
 }
 
@@ -639,29 +604,28 @@ static int snd_card_saa7134_capture_close(snd_pcm_substream_t * substream)
 static int snd_card_saa7134_capture_open(snd_pcm_substream_t * substream)
 {
         snd_pcm_runtime_t *runtime = substream->runtime;
-        snd_card_saa7134_pcm_t *saapcm;
+        snd_card_saa7134_pcm_t *pcm;
         snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
-        struct saa7134_dev *dev = saa7134->saadev;
+        struct saa7134_dev *dev = saa7134->dev;
         int err;
 
         down(&dev->dmasound.lock);
 
-        dev->dmasound.afmt        = SNDRV_PCM_FORMAT_U8;
-        dev->dmasound.channels    = 2;
         dev->dmasound.read_count  = 0;
         dev->dmasound.read_offset = 0;
 
         up(&dev->dmasound.lock);
 
-        saapcm = kzalloc(sizeof(*saapcm), GFP_KERNEL);
-        if (saapcm == NULL)
+        pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
+        if (pcm == NULL)
                 return -ENOMEM;
-        saapcm->saadev=saa7134->saadev;
 
-        spin_lock_init(&saapcm->lock);
+        pcm->dev=saa7134->dev;
+
+        spin_lock_init(&pcm->lock);
 
-        saapcm->substream = substream;
-        runtime->private_data = saapcm;
+        pcm->substream = substream;
+        runtime->private_data = pcm;
         runtime->private_free = snd_card_saa7134_runtime_free;
         runtime->hw = snd_card_saa7134_capture;
 
@@ -736,7 +700,6 @@ static int snd_saa7134_volume_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
 static int snd_saa7134_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
         snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
-        unsigned long flags;
         int change, addr = kcontrol->private_value;
         int left, right;
 
@@ -750,12 +713,12 @@ static int snd_saa7134_volume_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
                 right = 0;
         if (right > 20)
                 right = 20;
-        spin_lock_irqsave(&chip->mixer_lock, flags);
+        spin_lock_irq(&chip->mixer_lock);
         change = chip->mixer_volume[addr][0] != left ||
                  chip->mixer_volume[addr][1] != right;
         chip->mixer_volume[addr][0] = left;
         chip->mixer_volume[addr][1] = right;
-        spin_unlock_irqrestore(&chip->mixer_lock, flags);
+        spin_unlock_irq(&chip->mixer_lock);
         return change;
 }
 
@@ -777,38 +740,37 @@ static int snd_saa7134_capsrc_info(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_
 static int snd_saa7134_capsrc_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
         snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
-        unsigned long flags;
         int addr = kcontrol->private_value;
 
-        spin_lock_irqsave(&chip->mixer_lock, flags);
+        spin_lock_irq(&chip->mixer_lock);
         ucontrol->value.integer.value[0] = chip->capture_source[addr][0];
         ucontrol->value.integer.value[1] = chip->capture_source[addr][1];
-        spin_unlock_irqrestore(&chip->mixer_lock, flags);
+        spin_unlock_irq(&chip->mixer_lock);
+
         return 0;
 }
 
 static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
         snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
-        unsigned long flags;
         int change, addr = kcontrol->private_value;
         int left, right;
         u32 anabar, xbarin;
         int analog_io, rate;
         struct saa7134_dev *dev;
 
-        dev = chip->saadev;
+        dev = chip->dev;
 
         left = ucontrol->value.integer.value[0] & 1;
         right = ucontrol->value.integer.value[1] & 1;
-        spin_lock_irqsave(&chip->mixer_lock, flags);
+        spin_lock_irq(&chip->mixer_lock);
 
         change = chip->capture_source[addr][0] != left ||
                  chip->capture_source[addr][1] != right;
         chip->capture_source[addr][0] = left;
         chip->capture_source[addr][1] = right;
         dev->dmasound.input=addr;
-        spin_unlock_irqrestore(&chip->mixer_lock, flags);
+        spin_unlock_irq(&chip->mixer_lock);
 
 
         if (change) {
@@ -898,43 +860,44 @@ static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
         return 0;
 }
 
-static int snd_saa7134_free(snd_card_saa7134_t *chip)
+static void snd_saa7134_free(snd_card_t * card)
 {
-        return 0;
-}
+        snd_card_saa7134_t *chip = card->private_data;
+
+        if (chip->dev->dmasound.priv_data == NULL)
+                return;
+
+        if (chip->irq >= 0) {
+                synchronize_irq(chip->irq);
+                free_irq(chip->irq, &chip->dev->dmasound);
+        }
+
+        chip->dev->dmasound.priv_data = NULL;
 
-static int snd_saa7134_dev_free(snd_device_t *device)
-{
-        snd_card_saa7134_t *chip = device->device_data;
-        return snd_saa7134_free(chip);
 }
 
 /*
  * ALSA initialization
  *
- *   Called by saa7134-core, it creates the basic structures and registers
- *  the ALSA devices
+ *   Called by the init routine, once for each saa7134 device present,
+ *  it creates the basic structures and registers the ALSA devices
  *
  */
 
-int alsa_card_saa7134_create (struct saa7134_dev *saadev)
+static int alsa_card_saa7134_create(struct saa7134_dev *dev, int devnum)
 {
-        static int dev;
 
         snd_card_t *card;
         snd_card_saa7134_t *chip;
         int err;
-        static snd_device_ops_t ops = {
-                .dev_free =     snd_saa7134_dev_free,
-        };
 
 
-        if (dev >= SNDRV_CARDS)
+        if (devnum >= SNDRV_CARDS)
                 return -ENODEV;
-        if (!enable[dev])
+        if (!enable[devnum])
                 return -ENODEV;
 
-        card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+        card = snd_card_new(index[devnum], id[devnum], THIS_MODULE, sizeof(snd_card_saa7134_t));
 
         if (card == NULL)
                 return -ENOMEM;
@@ -943,34 +906,33 @@ int alsa_card_saa7134_create (struct saa7134_dev *saadev)
 
         /* Card "creation" */
 
-        chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
-        if (chip == NULL) {
-                return -ENOMEM;
-        }
+        card->private_free = snd_saa7134_free;
+        chip = (snd_card_saa7134_t *) card->private_data;
 
         spin_lock_init(&chip->lock);
         spin_lock_init(&chip->mixer_lock);
 
-        chip->saadev = saadev;
+        chip->dev = dev;
 
         chip->card = card;
 
-        chip->pci = saadev->pci;
-        chip->irq = saadev->pci->irq;
-        chip->iobase = pci_resource_start(saadev->pci, 0);
+        chip->pci = dev->pci;
+        chip->iobase = pci_resource_start(dev->pci, 0);
 
-        err = request_irq(saadev->pci->irq, saa7134_alsa_irq,
-                                SA_SHIRQ | SA_INTERRUPT, saadev->name, saadev);
+
+        err = request_irq(dev->pci->irq, saa7134_alsa_irq,
+                                SA_SHIRQ | SA_INTERRUPT, dev->name,
+                                (void*) &dev->dmasound);
 
         if (err < 0) {
                 printk(KERN_ERR "%s: can't get IRQ %d for ALSA\n",
-                        saadev->name, saadev->pci->irq);
+                        dev->name, dev->pci->irq);
                 goto __nodev;
         }
 
-        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
-                goto __nodev;
-        }
+        chip->irq = dev->pci->irq;
+
+        init_MUTEX(&dev->dmasound.lock);
 
         if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
                 goto __nodev;
@@ -984,19 +946,36 @@ int alsa_card_saa7134_create (struct saa7134_dev *saadev)
 
         strcpy(card->shortname, "SAA7134");
         sprintf(card->longname, "%s at 0x%lx irq %d",
-                chip->saadev->name, chip->iobase, chip->irq);
+                chip->dev->name, chip->iobase, chip->irq);
+
+        printk(KERN_INFO "%s/alsa: %s registered as card %d\n",dev->name,card->longname,index[devnum]);
 
         if ((err = snd_card_register(card)) == 0) {
-                snd_saa7134_cards[dev] = card;
+                snd_saa7134_cards[devnum] = card;
                 return 0;
         }
 
 __nodev:
         snd_card_free(card);
-        kfree(chip);
         return err;
 }
 
+
+static int alsa_device_init(struct saa7134_dev *dev)
+{
+        dev->dmasound.priv_data = dev;
+        alsa_card_saa7134_create(dev,dev->nr);
+        return 1;
+}
+
+static int alsa_device_exit(struct saa7134_dev *dev)
+{
+
+        snd_card_free(snd_saa7134_cards[dev->nr]);
+        snd_saa7134_cards[dev->nr] = NULL;
+        return 1;
+}
+
 /*
  * Module initializer
  *
@@ -1007,17 +986,30 @@ __nodev:
 
 static int saa7134_alsa_init(void)
 {
-        struct saa7134_dev *saadev = NULL;
-        struct list_head *list;
+        struct saa7134_dev *dev = NULL;
+        struct list_head *list;
+
+        if (!dmasound_init && !dmasound_exit) {
+                dmasound_init = alsa_device_init;
+                dmasound_exit = alsa_device_exit;
+        } else {
+                printk(KERN_WARNING "saa7134 ALSA: can't load, DMA sound handler already assigned (probably to OSS)\n");
+                return -EBUSY;
+        }
 
         printk(KERN_INFO "saa7134 ALSA driver for DMA sound loaded\n");
 
-        list_for_each(list,&saa7134_devlist) {
-                saadev = list_entry(list, struct saa7134_dev, devlist);
-                alsa_card_saa7134_create(saadev);
-        }
+        list_for_each(list,&saa7134_devlist) {
+                dev = list_entry(list, struct saa7134_dev, devlist);
+                if (dev->dmasound.priv_data == NULL) {
+                        alsa_device_init(dev);
+                } else {
+                        printk(KERN_ERR "saa7134 ALSA: DMA sound is being handled by OSS. ignoring %s\n",dev->name);
+                        return -EBUSY;
+                }
+        }
 
-        if (saadev == NULL)
+        if (dev == NULL)
                 printk(KERN_INFO "saa7134 ALSA: no saa7134 cards found\n");
 
         return 0;
@@ -1028,7 +1020,7 @@ static int saa7134_alsa_init(void)
  * Module destructor
  */
 
-void saa7134_alsa_exit(void)
+static void saa7134_alsa_exit(void)
 {
         int idx;
 
@@ -1036,12 +1028,18 @@ void saa7134_alsa_exit(void)
                 snd_card_free(snd_saa7134_cards[idx]);
         }
 
+        dmasound_init = NULL;
+        dmasound_exit = NULL;
         printk(KERN_INFO "saa7134 ALSA driver for DMA sound unloaded\n");
 
         return;
 }
 
-module_init(saa7134_alsa_init);
+/* We initialize this late, to make sure the sound system is up and running */
+late_initcall(saa7134_alsa_init);
 module_exit(saa7134_alsa_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Ricardo Cerqueira");
+
+
+