static int __init applicom_init()

in applicom.c [184:347]

• 124 lines of code
• 25 McCabe index (conditional complexity)

static int __init applicom_init(void)
{
	int i, numisa = 0;
	struct pci_dev *dev = NULL;
	void __iomem *RamIO;
	int boardno, ret;

	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");

	/* No mem and irq given - check for a PCI card */

	while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {

		if (!pci_match_id(applicom_pci_tbl, dev))
			continue;
		
		if (pci_enable_device(dev))
			return -EIO;

		RamIO = ioremap(pci_resource_start(dev, 0), LEN_RAM_IO);

		if (!RamIO) {
			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
				"space at 0x%llx\n",
				(unsigned long long)pci_resource_start(dev, 0));
			pci_disable_device(dev);
			return -EIO;
		}

		printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
		       applicom_pci_devnames[dev->device-1],
			   (unsigned long long)pci_resource_start(dev, 0),
		       dev->irq);

		boardno = ac_register_board(pci_resource_start(dev, 0),
				RamIO, 0);
		if (!boardno) {
			printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
			iounmap(RamIO);
			pci_disable_device(dev);
			continue;
		}

		if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
			printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
			iounmap(RamIO);
			pci_disable_device(dev);
			apbs[boardno - 1].RamIO = NULL;
			continue;
		}

		/* Enable interrupts. */

		writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);

		apbs[boardno - 1].irq = dev->irq;
	}

	/* Finished with PCI cards. If none registered, 
	 * and there was no mem/irq specified, exit */

	if (!mem || !irq) {
		if (numboards)
			goto fin;
		else {
			printk(KERN_INFO "ac.o: No PCI boards found.\n");
			printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
			return -ENXIO;
		}
	}

	/* Now try the specified ISA cards */

	for (i = 0; i < MAX_ISA_BOARD; i++) {
		RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);

		if (!RamIO) {
			printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
			continue;
		}

		if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
						  RamIO,i+1))) {
			iounmap(RamIO);
			continue;
		}

		printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);

		if (!numisa) {
			if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
				printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
				iounmap(RamIO);
				apbs[boardno - 1].RamIO = NULL;
			}
			else
				apbs[boardno - 1].irq = irq;
		}
		else
			apbs[boardno - 1].irq = 0;

		numisa++;
	}

	if (!numisa)
		printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
				"at mem 0x%lx\n", mem);

 fin:
	init_waitqueue_head(&FlagSleepRec);

	WriteErrorCount = 0;
	ReadErrorCount = 0;
	DeviceErrorCount = 0;

	if (numboards) {
		ret = misc_register(&ac_miscdev);
		if (ret) {
			printk(KERN_WARNING "ac.o: Unable to register misc device\n");
			goto out;
		}
		for (i = 0; i < MAX_BOARD; i++) {
			int serial;
			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];

			if (!apbs[i].RamIO)
				continue;

			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);

			boardname[serial] = 0;


			printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
			       i+1, boardname,
			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
			       (int)(readb(apbs[i].RamIO + VERS) & 0xF));
			
			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );

			if (serial != 0)
				printk(" S/N %d\n", serial);
			else
				printk("\n");
		}
		return 0;
	}

	else
		return -ENXIO;

out:
	for (i = 0; i < MAX_BOARD; i++) {
		if (!apbs[i].RamIO)
			continue;
		if (apbs[i].irq)
			free_irq(apbs[i].irq, &dummy);
		iounmap(apbs[i].RamIO);
	}
	return ret;
}