diff options
| author | Kent Gibson | 2019-11-05 10:04:29 +0800 |
|---|---|---|
| committer | Bartosz Golaszewski | 2019-11-12 16:30:31 +0100 |
| commit | e588bb1eae31be73fbec2b731be986a7c09635a4 (patch) | |
| tree | 6dad3bb5d9f7e13813b63bd8459eb38df01219b1 /include/uapi/linux/gpio.h | |
| parent | b043ed7ef0b358d7f32dc57c218f925fd2802aba (diff) | |
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>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'include/uapi/linux/gpio.h')
| -rw-r--r-- | include/uapi/linux/gpio.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/uapi/linux/gpio.h b/include/uapi/linux/gpio.h index 7cc21c3b0839..799cf823d493 100644 --- a/include/uapi/linux/gpio.h +++ b/include/uapi/linux/gpio.h @@ -101,6 +101,24 @@ struct gpiohandle_request { }; /** + * struct gpiohandle_config - Configuration for a GPIO handle request + * @flags: updated flags for the requested GPIO lines, such as + * GPIOHANDLE_REQUEST_OUTPUT, GPIOHANDLE_REQUEST_ACTIVE_LOW etc, OR:ed + * together + * @default_values: if the GPIOHANDLE_REQUEST_OUTPUT is set in flags, + * this specifies the default output value, should be 0 (low) or + * 1 (high), anything else than 0 or 1 will be interpreted as 1 (high) + * @padding: reserved for future use and should be zero filled + */ +struct gpiohandle_config { + __u32 flags; + __u8 default_values[GPIOHANDLES_MAX]; + __u32 padding[4]; /* padding for future use */ +}; + +#define GPIOHANDLE_SET_CONFIG_IOCTL _IOWR(0xB4, 0x0a, struct gpiohandle_config) + +/** * struct gpiohandle_data - Information of values on a GPIO handle * @values: when getting the state of lines this contains the current * state of a line, when setting the state of lines these should contain |