static int fsi_master_gpio_break()

in fsi-master-gpio.c [618:654]

• 27 lines of code
• 3 McCabe index (conditional complexity)

static int fsi_master_gpio_break(struct fsi_master *_master, int link)
{
	struct fsi_master_gpio *master = to_fsi_master_gpio(_master);
	unsigned long flags;

	if (link != 0)
		return -ENODEV;

	trace_fsi_master_gpio_break(master);

	mutex_lock(&master->cmd_lock);
	if (master->external_mode) {
		mutex_unlock(&master->cmd_lock);
		return -EBUSY;
	}

	local_irq_save(flags);

	set_sda_output(master, 1);
	sda_out(master, 1);
	clock_toggle(master, FSI_PRE_BREAK_CLOCKS);
	sda_out(master, 0);
	clock_toggle(master, FSI_BREAK_CLOCKS);
	echo_delay(master);
	sda_out(master, 1);
	clock_toggle(master, FSI_POST_BREAK_CLOCKS);

	local_irq_restore(flags);

	last_address_update(master, 0, false, 0);
	mutex_unlock(&master->cmd_lock);

	/* Wait for logic reset to take effect */
	udelay(200);

	return 0;
}