From 9b1f700dc54cd1eb6dc73e3260b2c284ec91cca4 Mon Sep 17 00:00:00 2001 From: Agathe Porte Date: Sat, 8 Feb 2020 14:28:16 +0100 Subject: add width and height support (hack) --- src/lib.rs | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'src/lib.rs') diff --git a/src/lib.rs b/src/lib.rs index f849712..0e32ee9 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,4 +1,5 @@ mod codes; +mod of_node; use std::fs::{File, OpenOptions}; use std::path::Path; @@ -198,4 +199,30 @@ impl FileScreen { pub fn default() -> std::io::Result { Screen::from_dev_path(&Path::new(DEFAULT_SCREEN_DEV_PATH)) } + + /// Get the width of the screen, in number of characters it can display. + /// + /// **Important note:** The implementation behind this function is + /// currently a hack that will go find the value in the `auxdisplay` + /// platform device tree node in + /// `/sys/devices/platform/auxdisplay/of_node/*`. This is because the + /// `charlcd` driver does not export the screen width nor height to + /// userspace (could be using `ioctl` or `read` syscalls). + /// + pub fn width(&self) -> std::io::Result { + of_node::display_width_chars() + } + + /// Get the height of the screen, in number of characters it can display. + /// + /// **Important note:** The implementation behind this function is + /// currently a hack that will go find the value in the `auxdisplay` + /// platform device tree node in + /// `/sys/devices/platform/auxdisplay/of_node/*`. This is because the + /// `charlcd` driver does not export the screen width nor height to + /// userspace (could be using `ioctl` or `read` syscalls). + /// + pub fn height(&self) -> std::io::Result { + of_node::display_height_chars() + } } -- cgit v1.2.3