linux-kernel - [PATCH v4 04/10] gpio: sysfs: pass gpiod_data directly to internal GPIO sysfs functions

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Message-Id: <20250704-gpio-sysfs-chip-export-v4-4-9289d8758243@linaro.org>
Date: Fri, 04 Jul 2025 14:58:51 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>, 
 Kent Gibson <warthog618@...il.com>, 
 Jan Lübbe <jlu@...gutronix.de>, 
 Marek Vasut <marex@...x.de>, Geert Uytterhoeven <geert+renesas@...der.be>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Andy Shevchenko <andriy.shevchenko@...el.com>, 
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v4 04/10] gpio: sysfs: pass gpiod_data directly to internal
 GPIO sysfs functions

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

We don't use any fields from struct device in gpio_sysfs_request_irq(),
gpio_sysfs_free_irq() and gpio_sysfs_set_active_low(). We only use the
dev argument to get the associated struct gpiod_data pointer with
dev_get_drvdata().

To make the transition to not using dev_get_drvdata() across line
callbacks for sysfs attributes easier, pass gpiod_data directly to
these functions instead of having it wrapped in struct device.

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib-sysfs.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 39e9ca31f034e20abd08fb5e9b4eecf24f127d5e..0cfa73e92b47fd089b973e96b5062694b7f8abd3 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -162,9 +162,8 @@ static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
 }
 
 /* Caller holds gpiod-data mutex. */
-static int gpio_sysfs_request_irq(struct device *dev, unsigned char flags)
+static int gpio_sysfs_request_irq(struct gpiod_data *data, unsigned char flags)
 {
-	struct gpiod_data *data = dev_get_drvdata(dev);
 	struct gpio_desc *desc = data->desc;
 	unsigned long irq_flags;
 	int ret;
@@ -223,9 +222,8 @@ static int gpio_sysfs_request_irq(struct device *dev, unsigned char flags)
  * Caller holds gpiod-data mutex (unless called after class-device
  * deregistration).
  */
-static void gpio_sysfs_free_irq(struct device *dev)
+static void gpio_sysfs_free_irq(struct gpiod_data *data)
 {
-	struct gpiod_data *data = dev_get_drvdata(dev);
 	struct gpio_desc *desc = data->desc;
 
 	CLASS(gpio_chip_guard, guard)(desc);
@@ -278,12 +276,12 @@ static ssize_t edge_store(struct device *dev, struct device_attribute *attr,
 		return size;
 
 	if (data->irq_flags)
-		gpio_sysfs_free_irq(dev);
+		gpio_sysfs_free_irq(data);
 
 	if (!flags)
 		return size;
 
-	status = gpio_sysfs_request_irq(dev, flags);
+	status = gpio_sysfs_request_irq(data, flags);
 	if (status)
 		return status;
 
@@ -294,9 +292,8 @@ static ssize_t edge_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR_RW(edge);
 
 /* Caller holds gpiod-data mutex. */
-static int gpio_sysfs_set_active_low(struct device *dev, int value)
+static int gpio_sysfs_set_active_low(struct gpiod_data *data, int value)
 {
-	struct gpiod_data *data = dev_get_drvdata(dev);
 	unsigned int flags = data->irq_flags;
 	struct gpio_desc *desc = data->desc;
 	int status = 0;
@@ -309,8 +306,8 @@ static int gpio_sysfs_set_active_low(struct device *dev, int value)
 	/* reconfigure poll(2) support if enabled on one edge only */
 	if (flags == GPIO_IRQF_TRIGGER_FALLING ||
 	    flags == GPIO_IRQF_TRIGGER_RISING) {
-		gpio_sysfs_free_irq(dev);
-		status = gpio_sysfs_request_irq(dev, flags);
+		gpio_sysfs_free_irq(data);
+		status = gpio_sysfs_request_irq(data, flags);
 	}
 
 	gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_CONFIG);
@@ -345,7 +342,7 @@ static ssize_t active_low_store(struct device *dev,
 
 	guard(mutex)(&data->mutex);
 
-	return gpio_sysfs_set_active_low(dev, value) ?: size;
+	return gpio_sysfs_set_active_low(data, value) ?: size;
 }
 static DEVICE_ATTR_RW(active_low);
 
@@ -814,7 +811,7 @@ void gpiod_unexport(struct gpio_desc *desc)
 		 * edge_store.
 		 */
 		if (data->irq_flags)
-			gpio_sysfs_free_irq(dev);
+			gpio_sysfs_free_irq(data);
 	}
 
 	put_device(dev);

-- 
2.48.1