Control the backlight

.idea/dictionaries/luke.xml

@@ -1,6 +1,7 @@
 <component name="ProjectDictionaryState">
   <dictionary name="luke">
     <words>
+      <w>backlight</w>
       <w>hotkey</w>
     </words>
   </dictionary>

Cargo.lock

@@ -125,6 +125,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "numtoa"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e521b6adefa0b2c1fa5d2abdf9a5216288686fe6146249215d884c0e5ab320b0"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.17"
@@ -180,6 +186,7 @@ dependencies = [
  "rusb",
  "serde",
  "serde_derive",
+ "sysfs-class",
  "toml",
 ]
 
@@ -222,6 +229,15 @@ dependencies = [
  "unicode-xid",
 ]
 
+[[package]]
+name = "sysfs-class"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "718e4a5d0e144ff01e05bb8618a4997d8901cdec74cf25826bca2535ef406f3e"
+dependencies = [
+ "numtoa",
+]
+
 [[package]]
 name = "take_mut"
 version = "0.2.2"

rog-lib/Cargo.toml

@@ -9,4 +9,5 @@ rusb = "0.5"
 gumdrop = "0.8"
 serde = "1.0"
 serde_derive = "1.0"
-toml = "0.5"
+toml = "0.5"
+sysfs-class = "0.1.2"

rog-lib/src/core.rs

@@ -4,6 +4,8 @@ use rusb::{DeviceHandle, Error};
 use std::cell::{Ref, RefCell};
 use std::str::FromStr;
 use std::time::Duration;
+use sysfs_class::Brightness;
+use sysfs_class::SysClass;
 
 pub const LED_MSG_LEN: usize = 17;
 static LED_INIT1: [u8; 2] = [0x5d, 0xb9];
@@ -165,15 +167,6 @@ impl RogCore {
         Err(Error::NotSupported)
     }
 
-    // pub fn load_config(&mut self) -> Result<(), Error> {
-    //     if let Some(current) = self.config.get_current() {
-    //         self.aura_set_and_save(&current)?;
-    //     }
-    //     let bright = RogCore::aura_brightness_bytes(self.config.brightness)?;
-    //     self.aura_set_and_save(&bright)?;
-    //     Ok(())
-    // }
-
     pub fn poll_keyboard(&self, buf: &mut [u8; 32]) -> Result<Option<usize>, Error> {
         match self
             .handle
@@ -192,3 +185,43 @@ impl RogCore {
         Ok(None)
     }
 }
+
+pub struct Backlight {
+    backlight: sysfs_class::Backlight,
+    step: u64,
+    max: u64,
+}
+
+impl Backlight {
+    pub fn new(id: &str) -> Result<Backlight, std::io::Error> {
+        for bl in sysfs_class::Backlight::iter() {
+            let bl = bl?;
+            if bl.id() == id {
+                let max = bl.max_brightness()?;
+                let step = max / 50;
+                return Ok(Backlight {
+                    backlight: bl,
+                    step,
+                    max,
+                });
+            }
+        }
+        panic!("Backlight not found")
+    }
+    pub fn step_up(&self) {
+        let brightness = self.backlight.brightness().unwrap();
+        if brightness + self.step <= self.max {
+            self.backlight
+                .set_brightness(brightness + self.step)
+                .unwrap();
+        }
+    }
+    pub fn step_down(&self) {
+        let brightness = self.backlight.brightness().unwrap();
+        if brightness > self.step {
+            self.backlight
+                .set_brightness(brightness - self.step)
+                .unwrap();
+        }
+    }
+}

rog-lib/src/laptops.rs

@@ -1,15 +1,11 @@
 use crate::aura::BuiltInModeByte;
-use crate::core::RogCore;
+use crate::core::{Backlight, RogCore};
 
 // ENV{POWER_SUPPLY_ONLINE}=="0", RUN+="gdbus call
 // --session --dest org.gnome.SettingsDaemon.Power
 // --object-path /org/gnome/SettingsDaemon/Power
 // --method org.freedesktop.DBus.Properties.Set org.gnome.SettingsDaemon.Power.Screen Brightness '<int32 65>'"
 
-const POWER_BUS_NAME: &'static str = "org.gnome.SettingsDaemon.Power";
-const POWER_IFACE_NAME: &'static str = "org.gnome.SettingsDaemon.Power.Screen";
-const POWER_PATH: &'static str = "/org/gnome/SettingsDaemon/Power";
-
 pub trait Laptop {
     fn do_hotkey_action(&self, core: &mut RogCore, key_byte: u8);
     fn hotkey_group_byte(&self) -> u8;
@@ -19,6 +15,7 @@ pub trait Laptop {
     fn board_name(&self) -> &str;
     fn prod_family(&self) -> &str;
 }
+
 pub struct LaptopGX502GW {
     usb_vendor: u16,
     usb_product: u16,
@@ -28,9 +25,12 @@ pub struct LaptopGX502GW {
     min_bright: u8,
     max_bright: u8,
     supported_modes: Vec<BuiltInModeByte>,
+    backlight: Backlight,
 }
+
 impl LaptopGX502GW {
     pub fn new() -> Self {
+        // Find backlight
         LaptopGX502GW {
             usb_vendor: 0x0B05,
             usb_product: 0x1866,
@@ -53,6 +53,7 @@ impl LaptopGX502GW {
                 BuiltInModeByte::ThinZoomy,
                 BuiltInModeByte::WideZoomy,
             ],
+            backlight: Backlight::new("intel_backlight").unwrap(),
         }
     }
 }
@@ -107,7 +108,12 @@ impl Laptop for LaptopGX502GW {
                     rogcore.config().write();
                 }
             }
-            GX502GWKeys::ScreenBrightUp => {}
+            GX502GWKeys::ScreenBrightUp => {
+                self.backlight.step_up();
+            }
+            GX502GWKeys::ScreenBrightDown => {
+                self.backlight.step_down();
+            }
             _ => {
                 if key_byte != 0 {
                     dbg!(&key_byte);