REG_INT_STAT
error = tca8418_read_byte(keypad_data, REG_INT_STAT, ®);
error = tca8418_write_byte(keypad_data, REG_INT_STAT, reg);
status = snd_bt87x_readl(chip, REG_INT_STAT);
snd_bt87x_writel(chip, REG_INT_STAT, irq_status);
snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);
snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);