void locomo_m62332_senddata()

in common/locomo.c [659:786]

• 107 lines of code
• 7 McCabe index (conditional complexity)

void locomo_m62332_senddata(struct locomo_dev *ldev, unsigned int dac_data, int channel)
{
	struct locomo *lchip = locomo_chip_driver(ldev);
	int i;
	unsigned char data;
	unsigned int r;
	void *mapbase = lchip->base;
	unsigned long flags;

	spin_lock_irqsave(&lchip->lock, flags);

	/* Start */
	udelay(DAC_BUS_FREE_TIME);	/* 5.0 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.0 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_START_HOLD_TIME);	/* 5.0 usec */
	udelay(DAC_DATA_HOLD_TIME);	/* 300 nsec */

	/* Send slave address and W bit (LSB is W bit) */
	data = (M62332_SLAVE_ADDR << 1) | M62332_W_BIT;
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 1\n");
		goto out;
	}

	/* Send Sub address (LSB is channel select) */
	/*    channel = 0 : ch1 select              */
	/*            = 1 : ch2 select              */
	data = M62332_SUB_ADDR + channel;
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 2\n");
		goto out;
	}

	/* Send DAC data */
	for (i = 1; i <= 8; i++) {
		locomo_m62332_sendbit(mapbase, dac_data >> (8 - i));
	}

	/* Check A bit */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SDAOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4.7 usec */
	if (locomo_readl(mapbase + LOCOMO_DAC) & LOCOMO_DAC_SDAOEB) {	/* High is error */
		printk(KERN_WARNING "locomo: m62332_senddata Error 3\n");
	}

out:
	/* stop */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r &=  ~(LOCOMO_DAC_SCLOEB);
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 300 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */
	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_HIGH_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_HIGH_HOLD_TIME);	/* 4 usec */

	r = locomo_readl(mapbase + LOCOMO_DAC);
	r |=  LOCOMO_DAC_SCLOEB | LOCOMO_DAC_SDAOEB;
	locomo_writel(r, mapbase + LOCOMO_DAC);
	udelay(DAC_LOW_SETUP_TIME);	/* 1000 nsec */
	udelay(DAC_SCL_LOW_HOLD_TIME);	/* 4.7 usec */

	spin_unlock_irqrestore(&lchip->lock, flags);
}