linux-kernel - [PATCH v12 11/11] gpio: 74x164: Utilize the for_each_set

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Message-Id: <d3cc8680aa3d0d741649ac7402a213db1a789583.1553494625.git.vilhelm.gray@gmail.com>
Date:   Mon, 25 Mar 2019 15:26:18 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com
Cc:     akpm@...ux-foundation.org, linux-gpio@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...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,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v12 11/11] gpio: 74x164: Utilize the for_each_set_clump8 macro

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

Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Phil Reid <preid@...ctromag.com.au>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/gpio/gpio-74x164.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index fb7b620763a2..e43a6de3b6eb 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -9,6 +9,7 @@
  *  published by the Free Software Foundation.
  */
 
+#include <linux/bitops.h>
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/spi/spi.h>
@@ -75,20 +76,19 @@ static void gen_74x164_set_multiple(struct gpio_chip *gc, unsigned long *mask,
 				    unsigned long *bits)
 {
 	struct gen_74x164_chip *chip = gpiochip_get_data(gc);
-	unsigned int i, idx, shift;
-	u8 bank, bankmask;
+	unsigned int offset;
+	unsigned long bankmask;
+	const unsigned int ngpio = chip->registers * 8;
+	size_t bank;
+	unsigned int bitmask;
 
 	mutex_lock(&chip->lock);
-	for (i = 0, bank = chip->registers - 1; i < chip->registers;
-	     i++, bank--) {
-		idx = i / sizeof(*mask);
-		shift = i % sizeof(*mask) * BITS_PER_BYTE;
-		bankmask = mask[idx] >> shift;
-		if (!bankmask)
-			continue;
+	for_each_set_clump8(offset, bankmask, mask, ngpio) {
+		bank = (chip->registers - 1) - (offset / 8);
+		bitmask = bitmap_get_value8(bits, ngpio, offset) & bankmask;
 
 		chip->buffer[bank] &= ~bankmask;
-		chip->buffer[bank] |= bankmask & (bits[idx] >> shift);
+		chip->buffer[bank] |= bitmask;
 	}
 	__gen_74x164_write_config(chip);
 	mutex_unlock(&chip->lock);
-- 
2.21.0