On Mon, Mar 12, 2018 at 10:49 PM, William Breathitt Gray
<vilhelm.gray@xxxxxxxxx> wrote:
> +static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
> + unsigned long *mask, unsigned long *bits)
> +{
> + /* clear bits array to a clean slate */
> + for (i = 0; i < chip->ngpio; i += BITS_PER_LONG)
> + bits[i / BITS_PER_LONG] = 0;
bitmap_clear() or bitmap_zero()
> + /* get bits are evaluated a gpio register size at a time */
> + for (i = 0; i < chip->ngpio; i += gpio_reg_size) {
> + bit_word_offset = i % BITS_PER_LONG;
> + bits_mask = mask[BIT_WORD(i)] & (reg_mask << bit_word_offset);
> + if (!bits_mask) {
> + /* no get bits in this register so skip to next one */
> + continue;
> + }
for_each_set_bit() ?
> + /* store acquired bits */
> + bits[BIT_WORD(i)] |= port_state << bit_word_offset;
__set_bit()
__clear_bit()
We have bitmap API for *ages*. Is it too hard to check?
--
With Best Regards,
Andy Shevchenko
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