Commit f2527d8f authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Bartosz Golaszewski
Browse files

gpio: Remove unused and obsoleted gpio_export_link()



gpio_export_link() is legacy and unused API, remove it for good.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Reviewed-by: default avatarYanteng Si <siyanteng@loongson.cn>
Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
parent 6f8ecb7f
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+0 −9
Original line number Diff line number Diff line
@@ -735,10 +735,6 @@ requested using gpio_request()::
	/* reverse gpio_export() */
	void gpio_unexport();

	/* create a sysfs link to an exported GPIO node */
	int gpio_export_link(struct device *dev, const char *name,
		unsigned gpio)

After a kernel driver requests a GPIO, it may only be made available in
the sysfs interface by gpio_export().  The driver can control whether the
signal direction may change.  This helps drivers prevent userspace code
@@ -748,11 +744,6 @@ This explicit exporting can help with debugging (by making some kinds
of experiments easier), or can provide an always-there interface that's
suitable for documenting as part of a board support package.

After the GPIO has been exported, gpio_export_link() allows creating
symlinks from elsewhere in sysfs to the GPIO sysfs node.  Drivers can
use this to provide the interface under their own device in sysfs with
a descriptive name.


API Reference
=============
+0 −8
Original line number Diff line number Diff line
@@ -672,10 +672,6 @@ GPIO 控制器的路径类似 /sys/class/gpio/gpiochip42/ (对于从#42 GPIO
	/* gpio_export()的逆操作 */
	void gpio_unexport();

	/* 创建一个 sysfs 连接到已导出的 GPIO 节点 */
	int gpio_export_link(struct device *dev, const char *name,
		unsigned gpio)

在一个内核驱动申请一个 GPIO 之后,它可以通过 gpio_export()使其在 sysfs
接口中可见。该驱动可以控制信号方向是否可修改。这有助于防止用户空间代码无意间
破坏重要的系统状态。
@@ -683,10 +679,6 @@ GPIO 控制器的路径类似 /sys/class/gpio/gpiochip42/ (对于从#42 GPIO
这个明确的导出有助于(通过使某些实验更容易来)调试,也可以提供一个始终存在的接口,
与文档配合作为板级支持包的一部分。

在 GPIO 被导出之后,gpio_export_link()允许在 sysfs 文件系统的任何地方
创建一个到这个 GPIO sysfs 节点的符号链接。这样驱动就可以通过一个描述性的
名字,在 sysfs 中他们所拥有的设备下提供一个(到这个 GPIO sysfs 节点的)接口。


API参考
=======
+0 −9
Original line number Diff line number Diff line
@@ -634,18 +634,9 @@ GPIO 控制器的路徑類似 /sys/class/gpio/gpiochip42/ (對於從#42 GPIO
	/* gpio_export()的逆操作 */
	void gpio_unexport();

	/* 創建一個 sysfs 連接到已導出的 GPIO 節點 */
	int gpio_export_link(struct device *dev, const char *name,
		unsigned gpio)

在一個內核驅動申請一個 GPIO 之後,它可以通過 gpio_export()使其在 sysfs
接口中可見。該驅動可以控制信號方向是否可修改。這有助於防止用戶空間代碼無意間
破壞重要的系統狀態。

這個明確的導出有助於(通過使某些實驗更容易來)調試,也可以提供一個始終存在的接口,
與文檔配合作爲板級支持包的一部分。

在 GPIO 被導出之後,gpio_export_link()允許在 sysfs 文件系統的任何地方
創建一個到這個 GPIO sysfs 節點的符號連結。這樣驅動就可以通過一個描述性的
名字,在 sysfs 中他們所擁有的設備下提供一個(到這個 GPIO sysfs 節點的)接口。
+0 −6
Original line number Diff line number Diff line
@@ -103,12 +103,6 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
	return gpiod_export(gpio_to_desc(gpio), direction_may_change);
}

static inline int gpio_export_link(struct device *dev, const char *name,
				   unsigned gpio)
{
	return gpiod_export_link(dev, name, gpio_to_desc(gpio));
}

static inline void gpio_unexport(unsigned gpio)
{
	gpiod_unexport(gpio_to_desc(gpio));
+0 −8
Original line number Diff line number Diff line
@@ -197,14 +197,6 @@ static inline int gpio_export(unsigned gpio, bool direction_may_change)
	return -EINVAL;
}

static inline int gpio_export_link(struct device *dev, const char *name,
				unsigned gpio)
{
	/* GPIO can never have been exported */
	WARN_ON(1);
	return -EINVAL;
}

static inline void gpio_unexport(unsigned gpio)
{
	/* GPIO can never have been exported */