linux-kernel - [PATCH v4 3/5] gpio: sysfs: emit chardev line-state events on GPIO export

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Message-Id: <20241031-gpio-notify-sysfs-v4-3-142021c2195c@linaro.org>
Date: Thu, 31 Oct 2024 21:01:53 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Kent Gibson <warthog618@...il.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v4 3/5] gpio: sysfs: emit chardev line-state events on GPIO
 export

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

We already emit a CONFIG_RELEASED event when a line is unexported over
sysfs (this is handled by gpiod_free()) but we don't do the opposite
when it's exported. This adds the missing call to
gpiod_line_state_notify().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib-sysfs.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index e6c1e26f302d..dd5e850c9517 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -21,6 +21,8 @@
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 
+#include <uapi/linux/gpio.h>
+
 #include "gpiolib.h"
 #include "gpiolib-sysfs.h"
 
@@ -471,10 +473,12 @@ static ssize_t export_store(const struct class *class,
 	}
 
 	status = gpiod_export(desc, true);
-	if (status < 0)
+	if (status < 0) {
 		gpiod_free(desc);
-	else
+	} else {
 		set_bit(FLAG_SYSFS, &desc->flags);
+		gpiod_line_state_notify(desc, GPIO_V2_LINE_CHANGED_REQUESTED);
+	}
 
 done:
 	if (status)

-- 
2.45.2