bt878.c

linux环境下的dvb驱动程序

				     (astat & BT878_ARIPERR) ? " RIPERR" :
				     "",
				     (astat & BT878_APPERR) ? " PPERR" :
				     "", btread(BT878_ARISC_PC));
			}
		}
		if (astat & (BT878_AFDSR | BT878_AFTRGT | BT878_AFBUS)) {
			if (bt878_verbose) {
				printk
				    ("bt878(%d): irq%s%s%s risc_pc=%08x\n",
				     bt->nr,
				     (astat & BT878_AFDSR) ? " FDSR" : "",
				     (astat & BT878_AFTRGT) ? " FTRGT" :
				     "",
				     (astat & BT878_AFBUS) ? " FBUS" : "",
				     btread(BT878_ARISC_PC));
			}
		}
		if (astat & BT878_ARISCI) {
			bt->finished_block = (stat & BT878_ARISCS) >> 28;
			tasklet_schedule(&bt->tasklet);
			break;
		}
		count++;
		if (count > 20) {
			btwrite(0, BT878_AINT_MASK);
			printk(KERN_ERR
			       "bt878(%d): IRQ lockup, cleared int mask\n",
			       bt->nr);
			break;
		}
	}
	return IRQ_HANDLED;
}

extern int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data);
extern int bttv_read_gpio(unsigned int card, unsigned long *data);
extern int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data);

int
bt878_device_control(struct bt878 *bt, unsigned int cmd, union dst_gpio_packet *mp)
{
	int retval;

	retval = 0;
	if (down_interruptible (&bt->gpio_lock))
		return -ERESTARTSYS;
	/* special gpio signal */
	switch (cmd) {
	    case DST_IG_ENABLE:
		// dprintk("dvb_bt8xx: dst enable mask 0x%02x enb 0x%02x \n", mp->dstg.enb.mask, mp->dstg.enb.enable);
		retval = bttv_gpio_enable(bt->bttv_nr,
				mp->enb.mask,
				mp->enb.enable);
		break;
	    case DST_IG_WRITE:
		// dprintk("dvb_bt8xx: dst write gpio mask 0x%02x out 0x%02x\n", mp->dstg.outp.mask, mp->dstg.outp.highvals);
		retval = bttv_write_gpio(bt->bttv_nr,
				mp->outp.mask,
				mp->outp.highvals);

		break;
	    case DST_IG_READ:
		/* read */
		retval =  bttv_read_gpio(bt->bttv_nr, &mp->rd.value);
		// dprintk("dvb_bt8xx: dst read gpio 0x%02x\n", (unsigned)mp->dstg.rd.value);
		break;
	    case DST_IG_TS:
		/* Set packet size */
		bt->TS_Size = mp->psize;
		break;

	    default:
		retval = -EINVAL;
		break;
	}
	up(&bt->gpio_lock);
	return retval;
}

EXPORT_SYMBOL(bt878_device_control);

struct bt878 *bt878_find_by_dvb_adap(struct dvb_adapter *adap)
{
	unsigned int card_nr;
	
	printk("bt878 find by dvb adap: checking \"%s\"\n",adap->name);
	for (card_nr = 0; card_nr < bt878_num; card_nr++) {
		if (bt878[card_nr].adap_ptr == adap)
			return &bt878[card_nr];
	}
	printk("bt878 find by dvb adap: NOT found \"%s\"\n",adap->name);
	return NULL;
}

EXPORT_SYMBOL(bt878_find_by_dvb_adap);

/***********************/
/* PCI device handling */
/***********************/

static int __devinit bt878_probe(struct pci_dev *dev,
				 const struct pci_device_id *pci_id)
{
	int result;
	unsigned char lat;
	struct bt878 *bt;
#if defined(__powerpc__)
	unsigned int cmd;
#endif

	printk(KERN_INFO "bt878: Bt878 AUDIO function found (%d).\n",
	       bt878_num);

	bt = &bt878[bt878_num];
	bt->dev = dev;
	bt->nr = bt878_num;
	bt->shutdown = 0;

	bt->id = dev->device;
	bt->irq = dev->irq;
	bt->bt878_adr = pci_resource_start(dev, 0);
	if (pci_enable_device(dev))
		return -EIO;
	if (!request_mem_region(pci_resource_start(dev, 0),
				pci_resource_len(dev, 0), "bt878")) {
		return -EBUSY;
	}

	pci_read_config_byte(dev, PCI_CLASS_REVISION, &bt->revision);
	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
	printk(KERN_INFO "bt878(%d): Bt%x (rev %d) at %02x:%02x.%x, ",
	       bt878_num, bt->id, bt->revision, dev->bus->number,
	       PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
	printk("irq: %d, latency: %d, memory: 0x%lx\n",
	       bt->irq, lat, bt->bt878_adr);


#if defined(__powerpc__)
	/* on OpenFirmware machines (PowerMac at least), PCI memory cycle */
	/* response on cards with no firmware is not enabled by OF */
	pci_read_config_dword(dev, PCI_COMMAND, &cmd);
	cmd = (cmd | PCI_COMMAND_MEMORY);
	pci_write_config_dword(dev, PCI_COMMAND, cmd);
#endif

#ifdef __sparc__
	bt->bt878_mem = (unsigned char *) bt->bt878_adr;
#else
	bt->bt878_mem = ioremap(bt->bt878_adr, 0x1000);
#endif

	/* clear interrupt mask */
	btwrite(0, BT848_INT_MASK);

	result = request_irq(bt->irq, bt878_irq,
			     SA_SHIRQ | SA_INTERRUPT, "bt878",
			     (void *) bt);
	if (result == -EINVAL) {
		printk(KERN_ERR "bt878(%d): Bad irq number or handler\n",
		       bt878_num);
		goto fail1;
	}
	if (result == -EBUSY) {
		printk(KERN_ERR
		       "bt878(%d): IRQ %d busy, change your PnP config in BIOS\n",
		       bt878_num, bt->irq);
		goto fail1;
	}
	if (result < 0)
		goto fail1;

	pci_set_master(dev);
	pci_set_drvdata(dev, bt);

/*        if(init_bt878(btv) < 0) {
                bt878_remove(dev);
                return -EIO;
        }
*/

	if ((result = bt878_mem_alloc(bt))) {
		printk("bt878: failed to allocate memory!\n");
		goto fail2;
	}

	bt878_make_risc(bt);
	btwrite(0, BT878_AINT_MASK);
	bt878_num++;

	return 0;

      fail2:
	free_irq(bt->irq, bt);
      fail1:
	release_mem_region(pci_resource_start(bt->dev, 0),
			   pci_resource_len(bt->dev, 0));
	return result;
}

static void __devexit bt878_remove(struct pci_dev *pci_dev)
{
	u8 command;
	struct bt878 *bt = pci_get_drvdata(pci_dev);

	if (bt878_verbose)
		printk("bt878(%d): unloading\n", bt->nr);

	/* turn off all capturing, DMA and IRQs */
	btand(~13, BT878_AGPIO_DMA_CTL);

	/* first disable interrupts before unmapping the memory! */
	btwrite(0, BT878_AINT_MASK);
	btwrite(~0x0UL, BT878_AINT_STAT);

	/* disable PCI bus-mastering */
	pci_read_config_byte(bt->dev, PCI_COMMAND, &command);
	/* Should this be &=~ ?? */
	command &= ~PCI_COMMAND_MASTER;
	pci_write_config_byte(bt->dev, PCI_COMMAND, command);

	free_irq(bt->irq, bt);
	printk(KERN_DEBUG "bt878_mem: 0x%p.\n", bt->bt878_mem);
	if (bt->bt878_mem)
		iounmap(bt->bt878_mem);

	release_mem_region(pci_resource_start(bt->dev, 0),
			   pci_resource_len(bt->dev, 0));
	/* wake up any waiting processes
	   because shutdown flag is set, no new processes (in this queue)
	   are expected
	 */
	bt->shutdown = 1;
	bt878_mem_free(bt);

	pci_set_drvdata(pci_dev, NULL);
	return;
}

static struct pci_device_id bt878_pci_tbl[] __devinitdata = {
	{PCI_VENDOR_ID_BROOKTREE, PCI_DEVICE_ID_BROOKTREE_878,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}
};

MODULE_DEVICE_TABLE(pci, bt878_pci_tbl);

static struct pci_driver bt878_pci_driver = {
      .name 	= "bt878",
      .id_table = bt878_pci_tbl,
      .probe 	= bt878_probe,
      .remove 	= bt878_remove,
};

static int bt878_pci_driver_registered = 0;

/* This will be used later by dvb-bt8xx to only use the audio
 * dma of certain cards */
int bt878_find_audio_dma(void)
{
	// pci_register_driver(&bt878_pci_driver);
	bt878_pci_driver_registered = 1;
	return 0;
}

EXPORT_SYMBOL(bt878_find_audio_dma);

/*******************************/
/* Module management functions */
/*******************************/

int bt878_init_module(void)
{
	bt878_num = 0;
	bt878_pci_driver_registered = 0;

	printk(KERN_INFO "bt878: AUDIO driver version %d.%d.%d loaded\n",
	       (BT878_VERSION_CODE >> 16) & 0xff,
	       (BT878_VERSION_CODE >> 8) & 0xff,
	       BT878_VERSION_CODE & 0xff);
/*
        bt878_check_chipset();
*/
	/* later we register inside of bt878_find_audio_dma
	 * because we may want to ignore certain cards */
	bt878_pci_driver_registered = 1;
	return pci_module_init(&bt878_pci_driver);
}

void bt878_cleanup_module(void)
{
	if (bt878_pci_driver_registered) {
		bt878_pci_driver_registered = 0;
		pci_unregister_driver(&bt878_pci_driver);
	}
	return;
}

EXPORT_SYMBOL(bt878_init_module);
EXPORT_SYMBOL(bt878_cleanup_module);
module_init(bt878_init_module);
module_exit(bt878_cleanup_module);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */