linux-kernel - [PATCH 12/14] gpio: latch: use value returning setters

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Message-Id: <20250211-gpio-set-retval-v1-12-52d3d613d7d3@linaro.org>
Date: Tue, 11 Feb 2025 13:09:46 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Michael Walle <mwalle@...nel.org>, 
 Bamvor Jian Zhang <bamv2005@...il.com>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, Keerthy <j-keerthy@...com>, 
 Uwe Kleine-König <ukleinek@...nel.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pwm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 12/14] gpio: latch: use value returning setters

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

struct gpio_chip now has additional variants of the set(_multiple)
driver callbacks that return an integer to indicate success or failure.
Convert the driver to using them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-latch.c | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/drivers/gpio/gpio-latch.c b/drivers/gpio/gpio-latch.c
index d5d3817eea67..184b7dd17425 100644
--- a/drivers/gpio/gpio-latch.c
+++ b/drivers/gpio/gpio-latch.c
@@ -72,41 +72,46 @@ static int gpio_latch_get_direction(struct gpio_chip *gc, unsigned int offset)
 	return GPIO_LINE_DIRECTION_OUT;
 }
 
-static void gpio_latch_set_unlocked(struct gpio_latch_priv *priv,
-				    int (*set)(struct gpio_desc *desc, int value),
-				    unsigned int offset, bool val)
+static int gpio_latch_set_unlocked(struct gpio_latch_priv *priv,
+				   int (*set)(struct gpio_desc *desc, int value),
+				   unsigned int offset, bool val)
 {
-	int latch = offset / priv->n_latched_gpios;
-	int i;
+	int latch = offset / priv->n_latched_gpios, i, ret;
 
 	assign_bit(offset, priv->shadow, val);
 
-	for (i = 0; i < priv->n_latched_gpios; i++)
-		set(priv->latched_gpios->desc[i],
-		    test_bit(latch * priv->n_latched_gpios + i, priv->shadow));
+	for (i = 0; i < priv->n_latched_gpios; i++) {
+		ret = set(priv->latched_gpios->desc[i],
+			  test_bit(latch * priv->n_latched_gpios + i,
+				   priv->shadow));
+		if (ret)
+			return ret;
+	}
 
 	ndelay(priv->setup_duration_ns);
 	set(priv->clk_gpios->desc[latch], 1);
 	ndelay(priv->clock_duration_ns);
 	set(priv->clk_gpios->desc[latch], 0);
+
+	return 0;
 }
 
-static void gpio_latch_set(struct gpio_chip *gc, unsigned int offset, int val)
+static int gpio_latch_set(struct gpio_chip *gc, unsigned int offset, int val)
 {
 	struct gpio_latch_priv *priv = gpiochip_get_data(gc);
 
 	guard(spinlock_irqsave)(&priv->spinlock);
 
-	gpio_latch_set_unlocked(priv, gpiod_set_value, offset, val);
+	return gpio_latch_set_unlocked(priv, gpiod_set_value, offset, val);
 }
 
-static void gpio_latch_set_can_sleep(struct gpio_chip *gc, unsigned int offset, int val)
+static int gpio_latch_set_can_sleep(struct gpio_chip *gc, unsigned int offset, int val)
 {
 	struct gpio_latch_priv *priv = gpiochip_get_data(gc);
 
 	guard(mutex)(&priv->mutex);
 
-	gpio_latch_set_unlocked(priv, gpiod_set_value_cansleep, offset, val);
+	return gpio_latch_set_unlocked(priv, gpiod_set_value_cansleep, offset, val);
 }
 
 static bool gpio_latch_can_sleep(struct gpio_latch_priv *priv, unsigned int n_latches)
@@ -160,11 +165,11 @@ static int gpio_latch_probe(struct platform_device *pdev)
 
 	if (gpio_latch_can_sleep(priv, n_latches)) {
 		priv->gc.can_sleep = true;
-		priv->gc.set = gpio_latch_set_can_sleep;
+		priv->gc.set_rv = gpio_latch_set_can_sleep;
 		mutex_init(&priv->mutex);
 	} else {
 		priv->gc.can_sleep = false;
-		priv->gc.set = gpio_latch_set;
+		priv->gc.set_rv = gpio_latch_set;
 		spin_lock_init(&priv->spinlock);
 	}
 

-- 
2.45.2