[PATCH v11 04/11] gpio: 104-idi-48: Utilize for_each_set_clump8 macro

[William Breathitt Gray]

Replace verbose implementation in get_multiple/set_multiple callbacks
with for_each_set_clump8 macro to simplify code and improve clarity.

Reviewed-by: Linus Walleij <linus.wall...@linaro.org>
Signed-off-by: William Breathitt Gray <vilhelm.g...@gmail.com>
---
 drivers/gpio/gpio-104-idi-48.c | 37 ++++++++--------------------------
 1 file changed, 8 insertions(+), 29 deletions(-)

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 88dc6f2449f6..59c571aecf9a 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -93,42 +93,21 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, 
unsigned long *mask,
        unsigned long *bits)
 {
        struct idi_48_gpio *const idi48gpio = gpiochip_get_data(chip);
-       size_t i;
+       unsigned int offset;
+       unsigned long gpio_mask;
        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);
+       const unsigned int ngpio = ARRAY_SIZE(ports) * 8;
+       unsigned int port_addr;
        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;
+       for_each_set_clump8(offset, gpio_mask, mask, ngpio) {
+               port_addr = idi48gpio->base + ports[offset / 8];
+               port_state = inb(port_addr) & gpio_mask;
 
-               /* 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 */
-               port_state = inb(idi48gpio->base + ports[i]);
-
-               /* store acquired bits at respective bits array offset */
-               bits[word_index] |= (port_state << word_offset) & word_mask;
+               bitmap_set_value8(bits, ngpio, port_state, offset);
        }
 
        return 0;
-- 
2.21.0