[PATCH 8/9] gpiolib-sysfs: Show gpio-name in /sys/class/gpio/gpio*/name
From: Markus Pargmann <hidden>
Date: 2015-07-17 09:33:33
Also in:
linux-gpio
Subsystem:
gpio subsystem, the rest · Maintainers:
Linus Walleij, Bartosz Golaszewski, Linus Torvalds
This patch adds a sysfs attribute 'name' to gpios that were exported. It exposes the newly added name property of gpio descriptors. Signed-off-by: Markus Pargmann <redacted> --- drivers/gpio/gpiolib-sysfs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index c3b74440ca67..058019879bab 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c@@ -139,6 +139,25 @@ static ssize_t value_store(struct device *dev, } static DEVICE_ATTR_RW(value); +static ssize_t gpio_name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpio_desc *desc = dev_get_drvdata(dev); + ssize_t status; + + mutex_lock(&sysfs_lock); + + if (!test_bit(FLAG_EXPORT, &desc->flags)) + status = -EIO; + else + status = sprintf(buf, "%s\n", desc->name); + + mutex_unlock(&sysfs_lock); + return status; +} + +static DEVICE_ATTR(name, 0444, gpio_name_show, NULL); + static irqreturn_t gpio_sysfs_irq(int irq, void *priv) { struct gpiod_data *data = priv;
@@ -377,6 +396,7 @@ static struct attribute *gpio_attrs[] = { &dev_attr_edge.attr, &dev_attr_value.attr, &dev_attr_active_low.attr, + &dev_attr_name.attr, NULL, };
--
2.1.4