static int get_esi_asic()

in eni.c [1595:1680]

• 80 lines of code
• 11 McCabe index (conditional complexity)

static int get_esi_asic(struct atm_dev *dev)
{
	struct eni_dev *eni_dev;
	unsigned char tonga;
	int error,failed,pci_error;
	int address,i,j;

	eni_dev = ENI_DEV(dev);
	error = pci_error = 0;
	tonga = SEPROM_MAGIC | SEPROM_DATA | SEPROM_CLK;
	SET_SEPROM;
	for (i = 0; i < ESI_LEN && !error && !pci_error; i++) {
		/* start operation */
		tonga |= SEPROM_DATA;
		SET_SEPROM;
		tonga |= SEPROM_CLK;
		SET_SEPROM;
		tonga &= ~SEPROM_DATA;
		SET_SEPROM;
		tonga &= ~SEPROM_CLK;
		SET_SEPROM;
		/* send address */
		address = ((i+SEPROM_ESI_BASE) << 1)+1;
		for (j = 7; j >= 0; j--) {
			tonga = (address >> j) & 1 ? tonga | SEPROM_DATA :
			    tonga & ~SEPROM_DATA;
			SET_SEPROM;
			tonga |= SEPROM_CLK;
			SET_SEPROM;
			tonga &= ~SEPROM_CLK;
			SET_SEPROM;
		}
		/* get ack */
		tonga |= SEPROM_DATA;
		SET_SEPROM;
		tonga |= SEPROM_CLK;
		SET_SEPROM;
		GET_SEPROM;
		failed = tonga & SEPROM_DATA;
		tonga &= ~SEPROM_CLK;
		SET_SEPROM;
		tonga |= SEPROM_DATA;
		SET_SEPROM;
		if (failed) error = -EIO;
		else {
			dev->esi[i] = 0;
			for (j = 7; j >= 0; j--) {
				dev->esi[i] <<= 1;
				tonga |= SEPROM_DATA;
				SET_SEPROM;
				tonga |= SEPROM_CLK;
				SET_SEPROM;
				GET_SEPROM;
				if (tonga & SEPROM_DATA) dev->esi[i] |= 1;
				tonga &= ~SEPROM_CLK;
				SET_SEPROM;
				tonga |= SEPROM_DATA;
				SET_SEPROM;
			}
			/* get ack */
			tonga |= SEPROM_DATA;
			SET_SEPROM;
			tonga |= SEPROM_CLK;
			SET_SEPROM;
			GET_SEPROM;
			if (!(tonga & SEPROM_DATA)) error = -EIO;
			tonga &= ~SEPROM_CLK;
			SET_SEPROM;
			tonga |= SEPROM_DATA;
			SET_SEPROM;
		}
		/* stop operation */
		tonga &= ~SEPROM_DATA;
		SET_SEPROM;
		tonga |= SEPROM_CLK;
		SET_SEPROM;
		tonga |= SEPROM_DATA;
		SET_SEPROM;
	}
	if (pci_error) {
		printk(KERN_ERR DEV_LABEL "(itf %d): error reading ESI "
		    "(0x%02x)\n",dev->number,pci_error);
		error = -EIO;
	}
	return error;
}