[PATCH] V4L: 925: saa7134 alsa is now a standalone module

Saa7134-alsa is now a standalone module

Signed-off-by: Ricardo Cerqueira <v4l@cerqueira.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 98 insertions, 12 deletions

diff --git a/drivers/media/video/saa7134/saa7134-alsa.c b/drivers/media/video/saa7134/saa7134-alsa.c
index bf454437b771..7972939cb46c 100644
--- a/drivers/media/video/saa7134/saa7134-alsa.c
+++ b/drivers/media/video/saa7134/saa7134-alsa.c
@@ -1,6 +1,5 @@
 /*
  *   SAA713x ALSA support for V4L
- *   Ricardo Cerqueira <v4l@cerqueira.org>
  *
  *
  *   Caveats:
@@ -37,9 +36,13 @@
 #include "saa7134.h"
 #include "saa7134-reg.h"
 
-static unsigned int alsa_debug  = 0;
-module_param(alsa_debug, int, 0644);
-MODULE_PARM_DESC(alsa_debug,"enable debug messages [alsa]");
+static unsigned int debug  = 0;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"enable debug messages [alsa]");
+
+unsigned int dsp_nr = 0;
+module_param(dsp_nr,   int, 0444);
+MODULE_PARM_DESC(dsp_nr,   "alsa device number");
 
 /*
  * Configuration macros
@@ -69,7 +72,7 @@ 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};
 
-#define dprintk(fmt, arg...)    if (alsa_debug) \
+#define dprintk(fmt, arg...)    if (debug) \
         printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ## arg)
 
 /*
@@ -107,6 +110,7 @@ typedef struct snd_card_saa7134_pcm {
 
 static snd_card_t *snd_saa7134_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
 
+
 /*
  * saa7134 DMA audio stop
  *
@@ -189,12 +193,11 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
 	/* next block addr */
 	next_blk = (dev->oss.dma_blk + 2) % dev->oss.blocks;
 	saa_writel(reg,next_blk * dev->oss.blksize);
-	if (alsa_debug > 2)
+	if (debug > 2)
 		dprintk("irq: ok, %s, next_blk=%d, addr=%x, blocks=%u, size=%u, read=%u\n",
 			(status & 0x10000000) ? "even" : "odd ", next_blk,
 			next_blk * dev->oss.blksize, dev->oss.blocks, dev->oss.blksize, dev->oss.read_count);
 
-
 	/* update status & wake waiting readers */
 	dev->oss.dma_blk = (dev->oss.dma_blk + 1) % dev->oss.blocks;
 	dev->oss.read_count += dev->oss.blksize;
@@ -212,6 +215,41 @@ void saa7134_irq_alsa_done(struct saa7134_dev *dev, unsigned long status)
 }
 
 /*
+ * IRQ request handler
+ *
+ *   Runs along with saa7134's IRQ handler, discards anything that isn't
+ *   DMA sound
+ *
+ */
+
+static irqreturn_t saa7134_alsa_irq(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct saa7134_dev *dev = (struct saa7134_dev*) dev_id;
+	unsigned long report, status;
+	int loop, handled = 0;
+
+	for (loop = 0; loop < 10; loop++) {
+		report = saa_readl(SAA7134_IRQ_REPORT);
+		status = saa_readl(SAA7134_IRQ_STATUS);
+
+		if (report & SAA7134_IRQ_REPORT_DONE_RA3) {
+			handled = 1;
+			saa_writel(SAA7134_IRQ_REPORT,report);
+			saa7134_irq_alsa_done(dev, status);
+		} else {
+			goto out;
+		}
+	}
+
+	if (loop == 10) {
+		dprintk("error! looping IRQ!");
+	}
+
+out:
+	return IRQ_RETVAL(handled);
+}
+
+/*
  * ALSA capture trigger
  *
  *   - One of the ALSA capture callbacks.
@@ -822,11 +860,9 @@ static int snd_saa7134_capsrc_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_
 		saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL1, 0xbbbb10);
 
 		if (left || right) { // We've got data, turn the input on
-		  //saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL2, 0x101010);
 		  saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, xbarin);
 		  saa_writel(SAA7133_ANALOG_IO_SELECT, anabar);
 		} else {
-		  //saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL2, 0x101010);
 		  saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1, 0);
 		  saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
 		}
@@ -889,9 +925,10 @@ static int snd_saa7134_dev_free(snd_device_t *device)
  *
  */
 
-int alsa_card_saa7134_create(struct saa7134_dev *saadev, unsigned int devicenum)
+int alsa_card_saa7134_create (struct saa7134_dev *saadev, unsigned int devicenum)
 {
 	static int dev;
+
 	snd_card_t *card;
 	snd_card_saa7134_t *chip;
 	int err;
@@ -899,6 +936,7 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev, unsigned int devicenum)
 		.dev_free =     snd_saa7134_dev_free,
 	};
 
+
 	if (dev >= SNDRV_CARDS)
 		return -ENODEV;
 	if (!enable[dev])
@@ -906,6 +944,7 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev, unsigned int devicenum)
 
 	if (devicenum) {
 		card = snd_card_new(devicenum, id[dev], THIS_MODULE, 0);
+		dsp_nr++;
 	} else {
 		card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
 	}
@@ -931,6 +970,15 @@ int alsa_card_saa7134_create(struct saa7134_dev *saadev, unsigned int devicenum)
 	chip->irq = saadev->pci->irq;
 	chip->iobase = pci_resource_start(saadev->pci, 0);
 
+	err = request_irq(chip->pci->irq, saa7134_alsa_irq,
+				SA_SHIRQ | SA_INTERRUPT, saadev->name, saadev);
+
+	if (err < 0) {
+		printk(KERN_ERR "%s: can't get IRQ %d for ALSA\n",
+			saadev->name, saadev->pci->irq);
+		return err;
+	}
+
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
 		snd_saa7134_free(chip);
 		return err;
@@ -963,10 +1011,48 @@ __nodev:
 	return err;
 }
 
-void alsa_card_saa7134_exit(void)
+/*
+ * Module initializer
+ *
+ * Loops through present saa7134 cards, and assigns an ALSA device
+ * to each one
+ *
+ */
+
+static int saa7134_alsa_init(void)
+{
+        struct saa7134_dev *saadev = NULL;
+        struct list_head *list;
+
+	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,dsp_nr);
+        }
+
+	if (saadev == NULL)
+		printk(KERN_INFO "saa7134 ALSA: no saa7134 cards found\n");
+
+	return 0;
+
+}
+
+/*
+ * Module destructor
+ */
+
+void saa7134_alsa_exit(void)
 {
 	int idx;
-	 for (idx = 0; idx < SNDRV_CARDS; idx++) {
+	for (idx = 0; idx < SNDRV_CARDS; idx++) {
 		snd_card_free(snd_saa7134_cards[idx]);
 	}
+	printk(KERN_INFO "saa7134 ALSA driver for DMA sound unloaded\n");
+	return;
 }
+
+module_init(saa7134_alsa_init);
+module_exit(saa7134_alsa_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ricardo Cerqueira");