linux-kernel - [PATCH v17 12/14] gpio: pisosr: Utilize the for_each_set

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Date:   Wed,  9 Oct 2019 11:27:10 -0400
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        akpm@...ux-foundation.org
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, andriy.shevchenko@...ux.intel.com,
        linux@...musvillemoes.dk, yamada.masahiro@...ionext.com,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        geert@...ux-m68k.org, preid@...ctromag.com.au, lukas@...ner.de,
        sean.nyekjaer@...vas.dk, morten.tiljeset@...vas.dk,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH v17 12/14] gpio: pisosr: Utilize the for_each_set_clump8 macro

Replace verbose implementation in get_multiple callback with
for_each_set_clump8 macro to simplify code and improve clarity.

Cc: Morten Hein Tiljeset <morten.tiljeset@...vas.dk>
Cc: Sean Nyekjaer <sean.nyekjaer@...vas.dk>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/gpio/gpio-pisosr.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpio/gpio-pisosr.c b/drivers/gpio/gpio-pisosr.c
index f809a5a8e9eb..9ab2c044ef52 100644
--- a/drivers/gpio/gpio-pisosr.c
+++ b/drivers/gpio/gpio-pisosr.c
@@ -96,16 +96,16 @@ static int pisosr_gpio_get_multiple(struct gpio_chip *chip,
 				    unsigned long *mask, unsigned long *bits)
 {
 	struct pisosr_gpio *gpio = gpiochip_get_data(chip);
-	unsigned int nbytes = DIV_ROUND_UP(chip->ngpio, 8);
-	unsigned int i, j;
+	unsigned long offset;
+	unsigned long gpio_mask;
+	unsigned long buffer_state;
 
 	pisosr_gpio_refresh(gpio);
 
 	bitmap_zero(bits, chip->ngpio);
-	for (i = 0; i < nbytes; i++) {
-		j = i / sizeof(unsigned long);
-		bits[j] |= ((unsigned long) gpio->buffer[i])
-			   << (8 * (i % sizeof(unsigned long)));
+	for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
+		buffer_state = gpio->buffer[offset / 8] & gpio_mask;
+		bitmap_set_value8(bits, buffer_state, offset);
 	}
 
 	return 0;
-- 
2.23.0