gpio: add new SET_CONFIG ioctl() to gpio chardev

Add the GPIOHANDLE_SET_CONFIG_IOCTL to the gpio chardev. The ioctl allows some of the configuration of a requested handle to be changed without having to release the line. The primary use case is the changing of direction for bi-directional lines. Based on initial work by Bartosz Golaszewski <bgolaszewski@baylibre.com>

Kent Gibson committed 7 years ago

Commit e588bb11 parent b043ed72 files · +87 −0Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/gpio.h+18−0

@@ -100,6 +100,24 @@ struct gpiohandle_request { · 99 unmodified lines
100	int fd;	100	int fd;
101	};	101	};
102		102
		103	/**
		104	* struct gpiohandle_config - Configuration for a GPIO handle request
		105	* @flags: updated flags for the requested GPIO lines, such as
		106	* GPIOHANDLE_REQUEST_OUTPUT, GPIOHANDLE_REQUEST_ACTIVE_LOW etc, OR:ed
		107	* together
		108	* @default_values: if the GPIOHANDLE_REQUEST_OUTPUT is set in flags,
		109	* this specifies the default output value, should be 0 (low) or
		110	* 1 (high), anything else than 0 or 1 will be interpreted as 1 (high)
		111	* @padding: reserved for future use and should be zero filled
		112	*/
		113	struct gpiohandle_config {
		114	__u32 flags;
		115	__u8 default_values[GPIOHANDLES_MAX];
		116	__u32 padding[4]; /* padding for future use */
		117	};
		118
		119	#define GPIOHANDLE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0a, struct gpiohandle_config)
		120
103	/**	121	/**
104	* struct gpiohandle_data - Information of values on a GPIO handle	122	* struct gpiohandle_data - Information of values on a GPIO handle
105	* @values: when getting the state of lines this contains the current	123	* @values: when getting the state of lines this contains the current