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From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: linus.walleij@linaro.org
Cc: linux-gpio@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	William Breathitt Gray <vilhelm.gray@gmail.com>
Subject: [PATCH v2 3/7] gpio: 104-idi-48: Utilize for_each_set_port_word macro
Date: Tue,  8 May 2018 09:27:13 -0400	[thread overview]
Message-ID: <20a56dc5911439a36485faaf2e515dac0ecc6206.1525785532.git.vilhelm.gray@gmail.com> (raw)
In-Reply-To: <cover.1525785532.git.vilhelm.gray@gmail.com>

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

  parent reply	other threads:[~2018-05-08 13:27 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08 13:26 [PATCH v2 0/7] Introduce the " William Breathitt Gray
2018-05-08 13:26 ` [PATCH v2 1/7] bitops: " William Breathitt Gray
2018-05-13 15:06   ` Andy Shevchenko
2018-05-14 13:04     ` William Breathitt Gray
2018-05-14 17:08       ` Andy Shevchenko
2018-05-08 13:27 ` [PATCH v2 2/7] gpio: 104-dio-48e: Utilize " William Breathitt Gray
2018-05-08 13:27 ` William Breathitt Gray [this message]
2018-05-08 13:27 ` [PATCH v2 4/7] gpio: gpio-mm: " William Breathitt Gray
2018-05-08 13:27 ` [PATCH v2 5/7] gpio: ws16c48: " William Breathitt Gray
2018-05-08 13:28 ` [PATCH v2 6/7] gpio: pci-idio-16: " William Breathitt Gray
2018-05-08 13:28 ` [PATCH v2 7/7] gpio: pcie-idio-24: " William Breathitt Gray
2018-05-13 15:11 ` [PATCH v2 0/7] Introduce the " Andy Shevchenko
2018-05-14 12:57   ` William Breathitt Gray

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