linux-kernel - [PATCH 4/6] gpiolib: cdev: simplify line event identification

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Date:   Wed, 13 Jul 2022 09:37:19 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        brgl@...ev.pl, linus.walleij@...aro.org, dipenp@...dia.com
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH 4/6] gpiolib: cdev: simplify line event identification

Reorganise line event identification code to reduce code duplication,
and replace if-else initializers with the ternary equivalent to
improve readability.

Signed-off-by: Kent Gibson <warthog618@...il.com>
---
 drivers/gpio/gpiolib-cdev.c | 42 ++++++++++++-------------------------
 1 file changed, 13 insertions(+), 29 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index bc7c8822ede0..34d0bdfe5498 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -590,26 +590,20 @@ static enum hte_return process_hw_ts_thread(void *p)
 
 	switch (eflags) {
 	case GPIO_V2_LINE_FLAG_EDGE_BOTH:
-		if (line->raw_level >= 0) {
-			if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
-				level = !line->raw_level;
-			else
-				level = line->raw_level;
-		} else {
-			level = gpiod_get_value_cansleep(line->desc);
-		}
+		level = (line->raw_level >= 0) ?
+				line->raw_level :
+				gpiod_get_raw_value_cansleep(line->desc);
 
-		if (level)
-			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
-		else
-			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+		if (test_bit(FLAG_ACTIVE_LOW, &line->desc->flags))
+			level = !level;
+
+		le.id = level ? GPIO_V2_LINE_EVENT_RISING_EDGE :
+				GPIO_V2_LINE_EVENT_FALLING_EDGE;
 		break;
 	case GPIO_V2_LINE_FLAG_EDGE_RISING:
-		/* Emit low-to-high event */
 		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
 		break;
 	case GPIO_V2_LINE_FLAG_EDGE_FALLING:
-		/* Emit high-to-low event */
 		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
 		break;
 	default:
@@ -684,20 +678,14 @@ static irqreturn_t edge_irq_thread(int irq, void *p)
 
 	switch (READ_ONCE(line->eflags)) {
 	case GPIO_V2_LINE_FLAG_EDGE_BOTH:
-		if (gpiod_get_value_cansleep(line->desc))
-			/* Emit low-to-high event */
-			le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
-		else
-			/* Emit high-to-low event */
-			le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
-
+		le.id = gpiod_get_value_cansleep(line->desc) ?
+				GPIO_V2_LINE_EVENT_RISING_EDGE :
+				GPIO_V2_LINE_EVENT_FALLING_EDGE;
 		break;
 	case GPIO_V2_LINE_FLAG_EDGE_RISING:
-		/* Emit low-to-high event */
 		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
 		break;
 	case GPIO_V2_LINE_FLAG_EDGE_FALLING:
-		/* Emit high-to-low event */
 		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
 		break;
 	default:
@@ -821,12 +809,8 @@ static void debounce_work_func(struct work_struct *work)
 			le.line_seqno : atomic_inc_return(&lr->seqno);
 	}
 
-	if (level)
-		/* Emit low-to-high event */
-		le.id = GPIO_V2_LINE_EVENT_RISING_EDGE;
-	else
-		/* Emit high-to-low event */
-		le.id = GPIO_V2_LINE_EVENT_FALLING_EDGE;
+	le.id = level ? GPIO_V2_LINE_EVENT_RISING_EDGE :
+			GPIO_V2_LINE_EVENT_FALLING_EDGE;
 
 	linereq_put_event(lr, &le);
 }
-- 
2.37.0