commit bdb32de10d5757873f82e0c2ae567677ea3a4ad7
Author: Zykino <zykino+git.tempi@protonmail.com>
Date:   Wed Mar 11 22:35:28 2020 +0100

    Initial commit, MVP ready/hardcoded

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..d1f4d2a
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,30 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb147597cdf94ed43ab7a9038716637d2d1bf2bc571da995d0028dec06bd3018"
+
+[[package]]
+name = "rppal"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "137dbba1fb867daa27cda4c3cd6a11bca5bb5a1551f034cf9319b994846ddbe1"
+dependencies = [
+ "lazy_static",
+ "libc",
+]
+
+[[package]]
+name = "tempi"
+version = "0.1.0"
+dependencies = [
+ "rppal",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b9e6373
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "tempi"
+version = "0.1.0"
+authors = ["Zykino"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rppal = "0.11.3"
+
diff --git a/src/fan/hysteresis.rs b/src/fan/hysteresis.rs
new file mode 100644
index 0000000..c99b3ba
--- /dev/null
+++ b/src/fan/hysteresis.rs
@@ -0,0 +1,45 @@
+use crate::fan::Fan;
+use crate::temperatures::Temperatures;
+
+use rppal::gpio::{Gpio, OutputPin};
+
+pub struct Hysteresis {
+    pub max_temperature: f64,
+    pub hysteresis: f64,
+    pin: OutputPin,
+}
+
+impl Hysteresis {
+    pub fn new(max_temperature: f64, hysteresis: f64, bcm_pin: u8) -> Hysteresis {
+        let gpio = Gpio::new().unwrap();
+        let mut pin = gpio.get(bcm_pin).unwrap().into_output();
+
+        pin.set_low();
+
+        Hysteresis {
+            max_temperature,
+            hysteresis,
+            pin,
+        }
+    }
+}
+
+impl Fan for Hysteresis {
+    fn update_temperature(&mut self, temperatures: &Temperatures) {
+        if temperatures.cpu > self.max_temperature {
+            self.pin.set_high();
+        } else {
+            if temperatures.cpu < self.max_temperature - self.hysteresis {
+                self.pin.set_low();
+            }
+        }
+    }
+
+    fn percentage(&self) -> f64 {
+        if self.pin.is_set_high() {
+            1_f64
+        } else {
+            0_f64
+        }
+    }
+}
diff --git a/src/fan/mod.rs b/src/fan/mod.rs
new file mode 100644
index 0000000..a4a7f82
--- /dev/null
+++ b/src/fan/mod.rs
@@ -0,0 +1,9 @@
+pub mod hysteresis;
+pub mod pwm;
+
+use crate::temperatures::Temperatures;
+
+pub trait Fan {
+    fn update_temperature(&mut self, _: &Temperatures);
+    fn percentage(&self) -> f64;
+}
diff --git a/src/fan/pwm.rs b/src/fan/pwm.rs
new file mode 100644
index 0000000..0d47cde
--- /dev/null
+++ b/src/fan/pwm.rs
@@ -0,0 +1,46 @@
+use crate::fan::Fan;
+use crate::temperatures::Temperatures;
+
+use rppal::pwm::{Channel, Polarity, Pwm as Pwm_rpi};
+
+pub struct Pwm {
+    pub max_temperature: f64,
+    pub min_temperature: f64,
+    pwm: Pwm_rpi,
+}
+
+impl Pwm {
+    pub fn new(max_temperature: f64, min_temperature: f64, bcm_pin: Channel) -> Pwm {
+        let pwm =
+            Pwm_rpi::with_frequency(bcm_pin, 0.1_f64, 0_f64, Polarity::Normal, false).unwrap();
+
+        Pwm {
+            max_temperature,
+            min_temperature,
+            pwm,
+        }
+    }
+}
+
+impl Fan for Pwm {
+    fn update_temperature(&mut self, temperatures: &Temperatures) {
+        let percentage = (temperatures.cpu - self.min_temperature)
+            / (self.max_temperature - self.min_temperature);
+        let percentage = if percentage > 1_f64 {
+            1_f64
+        } else {
+            percentage
+        };
+
+        if temperatures.cpu > self.min_temperature {
+            self.pwm.enable().unwrap();
+            self.pwm.set_duty_cycle(percentage).unwrap();
+        } else {
+            self.pwm.disable().unwrap();
+        }
+    }
+
+    fn percentage(&self) -> f64 {
+        self.pwm.duty_cycle().unwrap()
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ccb6c1e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,32 @@
+mod fan;
+mod temperatures;
+
+use fan::hysteresis::Hysteresis;
+use fan::pwm::Pwm;
+use fan::Fan;
+
+use rppal::pwm::Channel;
+use std::thread;
+use std::time::Duration;
+
+fn main() {
+    let mut temps = temperatures::Temperatures::default();
+
+    let mut fan: Box<dyn Fan> = if true {
+        Box::new(Hysteresis::new(52.0, 5.0, 18))
+    } else {
+        Box::new(Pwm::new(52.0, 42.0, Channel::Pwm0))
+    };
+
+    loop {
+        temps.update();
+        fan.update_temperature(&temps);
+        println!(
+            "CPU: {:.1}°C, fan is at {:.1}%",
+            temps.cpu,
+            fan.percentage() * 100_f64
+        );
+
+        thread::sleep(Duration::from_secs(5));
+    }
+}
diff --git a/src/temperatures.rs b/src/temperatures.rs
new file mode 100644
index 0000000..8a7cc12
--- /dev/null
+++ b/src/temperatures.rs
@@ -0,0 +1,28 @@
+use std::fs::File;
+use std::io::prelude::*;
+
+pub struct Temperatures {
+    pub cpu: f64,
+}
+
+impl Default for Temperatures {
+    fn default() -> Self {
+        Temperatures {
+            cpu: get_cpu_temp(),
+        }
+    }
+}
+
+impl Temperatures {
+    pub fn update(&mut self) {
+        self.cpu = get_cpu_temp();
+    }
+}
+
+fn get_cpu_temp() -> f64 {
+    let mut f = File::open("/sys/class/thermal/thermal_zone0/temp").unwrap();
+    let mut buffer = String::new();
+    f.read_to_string(&mut buffer).unwrap();
+
+    buffer.trim().parse::<f64>().unwrap() / 1_000_f64
+}