Source of gpio-104-dio-48e.c - linux-imx - PHYTEC BitBucket (Stash)

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        word_mask = mask[word_index] & (port_mask << word_offset);
        if (!word_mask) {
            /* no get bits in this port so skip to next one */
            continue;
        }
​
        /* read bits from current gpio port */
        port_state = inb(dio48egpio->base + ports[i]);
​
        /* store acquired bits at respective bits array offset */
        bits[word_index] |= port_state << word_offset;
        bits[word_index] |= (port_state << word_offset) & word_mask;
    }
​
    return 0;
}
​
static void dio48e_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
    struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
    const unsigned port = offset / 8;
    const unsigned mask = BIT(offset % 8);