Commit d143493c authored by Kent Gibson's avatar Kent Gibson Committed by Bartosz Golaszewski
Browse files

gpiolib: make cdev a build option 



Make the gpiolib-cdev module a build option.  This allows the CDEV
interface to be removed from the kernel to reduce kernel size in
applications where is it not required, and provides the parent for
other CDEV interface specific build options to follow.

Suggested-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: default avatarKent Gibson <warthog618@gmail.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: default avatarBartosz Golaszewski <bgolaszewski@baylibre.com>
parent b53911aa

drivers/gpio/Kconfig

+15 −2
Original line number Diff line number Diff line
@@ -66,8 +66,21 @@ config GPIO_SYSFS 


	  This ABI is deprecated. If you want to use GPIO from userspace,

	  use the character device /dev/gpiochipN with the appropriate

	  ioctl() operations instead. The character device is always

	  available.

	  ioctl() operations instead.



config GPIO_CDEV

	bool

	prompt "Character device (/dev/gpiochipN) support" if EXPERT

	default y

	help

	  Say Y here to add the character device /dev/gpiochipN interface

	  for GPIOs. The character device allows userspace to control GPIOs

	  using ioctl() operations.



	  Only say N if you are sure that the GPIO character device is not

	  required.



	  If unsure, say Y.



config GPIO_GENERIC

	depends on HAS_IOMEM # Only for IOMEM drivers

drivers/gpio/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,8 +6,8 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG 
obj-$(CONFIG_GPIOLIB)		+= gpiolib.o

obj-$(CONFIG_GPIOLIB)		+= gpiolib-devres.o

obj-$(CONFIG_GPIOLIB)		+= gpiolib-legacy.o

obj-$(CONFIG_GPIOLIB)		+= gpiolib-cdev.o

obj-$(CONFIG_OF_GPIO)		+= gpiolib-of.o

obj-$(CONFIG_GPIO_CDEV)		+= gpiolib-cdev.o

obj-$(CONFIG_GPIO_SYSFS)	+= gpiolib-sysfs.o

obj-$(CONFIG_GPIO_ACPI)		+= gpiolib-acpi.o

drivers/gpio/gpiolib-cdev.h

+15 −0
Original line number Diff line number Diff line
@@ -5,7 +5,22 @@ 


#include <linux/device.h>



#ifdef CONFIG_GPIO_CDEV



int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);

void gpiolib_cdev_unregister(struct gpio_device *gdev);



#else



static inline int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)

{

	return 0;

}



static inline void gpiolib_cdev_unregister(struct gpio_device *gdev)

{

}



#endif /* CONFIG_GPIO_CDEV */



#endif /* GPIOLIB_CDEV_H */