int bbc_i2c_writeb()

in char/bbc_i2c.c [150:179]

• 24 lines of code
• 6 McCabe index (conditional complexity)

int bbc_i2c_writeb(struct bbc_i2c_client *client, unsigned char val, int off)
{
	struct bbc_i2c_bus *bp = client->bp;
	int address = client->address;
	u8 status;
	int ret = -1;

	if (bp->i2c_bussel_reg != NULL)
		writeb(client->bus, bp->i2c_bussel_reg);

	writeb(address, bp->i2c_control_regs + 0x1);
	writeb(I2C_PCF_START, bp->i2c_control_regs + 0x0);
	if (wait_for_pin(bp, &status))
		goto out;

	writeb(off, bp->i2c_control_regs + 0x1);
	if (wait_for_pin(bp, &status) ||
	    (status & I2C_PCF_LRB) != 0)
		goto out;

	writeb(val, bp->i2c_control_regs + 0x1);
	if (wait_for_pin(bp, &status))
		goto out;

	ret = 0;

out:
	writeb(I2C_PCF_STOP, bp->i2c_control_regs + 0x0);
	return ret;
}