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Subject[PATCH v2 3/7] gpio: 104-idi-48: Utilize for_each_set_port_word macro
Date
Replace boilerplate code in the get_multiple callback with the
for_each_set_port_word macro in order to simplify and improve clarity.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
---
drivers/gpio/gpio-104-idi-48.c | 32 ++++----------------------------
1 file changed, 4 insertions(+), 28 deletions(-)

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 2c9738adb3a6..414dc8de0bd8 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -94,41 +94,17 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
{
struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
size_t i;
+ size_t word;
+ unsigned int offset;
static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
- const unsigned int gpio_reg_size = 8;
- unsigned int bits_offset;
- size_t word_index;
- unsigned int word_offset;
- unsigned long word_mask;
- const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
unsigned long port_state;

/* clear bits array to a clean slate */
bitmap_zero(bits, chip->ngpio);

- /* get bits are evaluated a gpio port register at a time */
- for (i = 0; i < ARRAY_SIZE(ports); i++) {
- /* gpio offset in bits array */
- bits_offset = i * gpio_reg_size;
-
- /* word index for bits array */
- word_index = BIT_WORD(bits_offset);
-
- /* gpio offset within current word of bits array */
- word_offset = bits_offset % BITS_PER_LONG;
-
- /* mask of get bits for current gpio within current word */
- 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 */
+ for_each_set_port_word(i, word, offset, mask, ARRAY_SIZE(ports), 8) {
port_state = inb(idi48gpio->base + ports[i]);
-
- /* store acquired bits at respective bits array offset */
- bits[word_index] |= port_state << word_offset;
+ bits[word] |= port_state << offset;
}

return 0;
--
2.17.0
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