Add basic components, CPUs interface (not single CPU yet)

Cargo.toml

@@ -1,5 +1,7 @@
 [package]
 name = "powerbox-cli"
+version = "0.1.0"
+edition = "2021"
 
 [workspace.package]
 version = "0.1.0"

crates/batbox/Cargo.toml

@@ -7,3 +7,4 @@ description = "Power toolbox for power supply devices"
 
 [dependencies]
 powerbox = { version = "0.1", path = "../core" }
+sysfuss = { version = "0.3", path = "../../../sysfs-nav" }

crates/core/src/lib.rs

@@ -7,16 +7,7 @@ pub use power_error::PowerError;
 mod power_trait;
 pub use power_trait::{Power, PowerOp};
 
-mod value;
-pub use value::Value;
+pub mod primitives;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = 2 + 2;
-        assert_eq!(result, 4);
-    }
-}
+mod support;
+pub use support::Support;

crates/core/src/power_error.rs

@@ -1,4 +1,22 @@
 /// All possible errors returned by the [Power] trait.
+#[derive(Debug)]
 pub enum PowerError {
-
+    /// Input parameter(s) failed validation
+    InvalidInput,
+    /// Input/output error
+    Io(std::io::Error),
+    /// An unknown error occured
+    Unknown,
 }
+
+impl core::fmt::Display for PowerError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::InvalidInput => write!(f, "invalid input"),
+            Self::Io(e) => write!(f, "io power error: {}", e),
+            Self::Unknown => write!(f, "unknown power error"),
+        }
+    }
+}
+
+impl std::error::Error for PowerError {}

crates/core/src/power_trait.rs

@@ -1,5 +1,5 @@
 use super::PowerError;
-use super::Value;
+use super::primitives::Value;
 
 /// Power control interface for a device
 pub trait Power<OP: PowerOp, VAL = Value> {
@@ -17,5 +17,5 @@ pub trait Power<OP: PowerOp, VAL = Value> {
 pub trait PowerOp {
     /// Do the operations match?
     /// This should ignore values of the operation.
-    fn is_eq_op(&self, other: Self) -> bool;
+    fn is_eq_op(&self, other: &Self) -> bool;
 }

crates/core/src/primitives/mod.rs

@@ -0,0 +1,7 @@
+//! Primitive types for power control values
+
+mod range;
+pub use range::{Range, RangeList, RangeListParseErr, RangeListItem};
+
+mod value;
+pub use value::Value;

crates/core/src/primitives/range.rs

@@ -0,0 +1,129 @@
+/// A combination of ranges of values and single items.
+pub struct RangeList<N> {
+    /// Elements of the list range
+    pub items: Vec<RangeListItem<N>>,
+}
+
+/// An item of the range list
+#[derive(PartialEq, Eq, Debug)]
+pub enum RangeListItem<N> {
+    /// A single item
+    Single(N),
+    /// A range of consecutive items
+    Range(Range<N>),
+}
+
+/// A range of values, usually inclusive.
+#[derive(PartialEq, Eq, Debug)]
+pub struct Range<N> {
+    /// Minimum limit of the range
+    pub min: N,
+    /// Maximum limit of the range, usually inclusive
+    pub max: N,
+}
+
+/// Range list parser error
+#[derive(Debug)]
+pub enum RangeListParseErr<E> {
+    /// The end of the string was encountered before parsing completed
+    UnexpectedEnd,
+    /// An item of the list failed to parse
+    Inner(E),
+}
+
+impl <E> From<E> for RangeListParseErr<E> {
+    fn from(value: E) -> Self {
+        RangeListParseErr::Inner(value)
+    }
+}
+
+impl <E: core::fmt::Display> core::fmt::Display for RangeListParseErr<E> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::UnexpectedEnd => write!(f, "unexpected end"),
+            Self::Inner(e) => write!(f, "inner error: {}", e),
+        }
+    }
+}
+
+impl <E: std::error::Error> std::error::Error for RangeListParseErr<E> {}
+
+impl <N: core::str::FromStr> core::str::FromStr for RangeList<N> {
+    type Err = RangeListParseErr<<N as core::str::FromStr>::Err>;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let mut items = Vec::new();
+        if s.is_empty() {
+            return Ok(Self { items });
+        }
+        let mut cur_item_start = 0;
+        let mut range_start = None;
+        for (i, c) in s.chars().enumerate() {
+            match c {
+                '-' => {
+                    range_start = Some(N::from_str(&s[cur_item_start..i])?);
+                    cur_item_start = i + 1;
+                },
+                ',' => {
+                    let item = N::from_str(&s[cur_item_start..i])?;
+                    if let Some(range_start) = range_start.take() {
+                        items.push(RangeListItem::Range(Range { min: range_start, max: item }));
+                    } else {
+                        items.push(RangeListItem::Single(item));
+                    }
+                    cur_item_start = i + 1;
+                }
+                _ => {}
+            }
+        }
+        if cur_item_start >= s.len() {
+            Err(RangeListParseErr::UnexpectedEnd)
+        } else {
+            let item = N::from_str(&s[cur_item_start..s.len()])?;
+            if let Some(range_start) = range_start.take() {
+                items.push(RangeListItem::Range(Range { min: range_start, max: item }));
+            } else {
+                items.push(RangeListItem::Single(item));
+            }
+            Ok(Self { items })
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn parse_range_then_single() -> Result<(), RangeListParseErr<<usize as std::str::FromStr>::Err>> {
+        let parsed: RangeList<usize> = "0-15,16".parse()?;
+        assert_eq!(parsed.items, vec![RangeListItem::Range(Range { min: 0, max: 15 }), RangeListItem::Single(16)]);
+        Ok(())
+    }
+
+    #[test]
+    fn parse_single_then_range() -> Result<(), RangeListParseErr<<usize as std::str::FromStr>::Err>> {
+        let parsed: RangeList<usize> = "11,19-22".parse()?;
+        assert_eq!(parsed.items, vec![RangeListItem::Single(11), RangeListItem::Range(Range { min: 19, max: 22 }), ]);
+        Ok(())
+    }
+
+    #[test]
+    fn parse_single() -> Result<(), RangeListParseErr<<usize as std::str::FromStr>::Err>> {
+        let parsed: RangeList<usize> = "42".parse()?;
+        assert_eq!(parsed.items, vec![RangeListItem::Single(42)]);
+        Ok(())
+    }
+
+    #[test]
+    fn parse_nothing() -> Result<(), RangeListParseErr<<usize as std::str::FromStr>::Err>> {
+        let parsed: RangeList<usize> = "".parse()?;
+        assert_eq!(parsed.items, vec![]);
+        Ok(())
+    }
+
+    #[test]
+    fn parse_fail() {
+        let parsed: Result<RangeList<usize>, _> = "1,2-".parse();
+        assert!(parsed.is_err_and(|e| matches!(e, RangeListParseErr::UnexpectedEnd)))
+    }
+}

crates/core/src/primitives/value.rs

@@ -0,0 +1,162 @@
+/// Value of a power reading
+pub enum Value<C = Box<dyn std::any::Any>> {
+    /// floating point value
+    Float(f64),
+    /// unsigned integer value
+    UInt(u64),
+    /// signed integer value
+    Int(i64),
+    /// boolean value
+    Bool(bool),
+    /// string value
+    String(String),
+    /// custom value
+    Custom(C),
+    /// unknown value
+    Unknown,
+}
+
+impl Value {
+    /// Convert to f64, if numeric type
+    pub fn as_f64(&self) -> Option<f64> {
+        match self {
+            Self::Float(f) => Some(*f),
+            Self::UInt(u) => Some(*u as _),
+            Self::Int(i) => Some(*i as _),
+            _ => None,
+        }
+    }
+
+    /// Convert to u64, if numeric type
+    pub fn as_u64(&self) -> Option<u64> {
+        match self {
+            Self::Float(f) => Some(*f as _),
+            Self::UInt(u) => Some(*u),
+            Self::Int(i) => Some(*i as _),
+            _ => None,
+        }
+    }
+
+    /// Convert to u64, if numeric type
+    pub fn as_i64(&self) -> Option<i64> {
+        match self {
+            Self::Float(f) => Some(*f as _),
+            Self::UInt(u) => Some(*u as _),
+            Self::Int(i) => Some(*i),
+            _ => None,
+        }
+    }
+
+    /// Convert to string, if possible
+    pub fn as_str(&self) -> Option<String> {
+        match self {
+            Self::Float(f) => Some(f.to_string()),
+            Self::UInt(u) => Some(u.to_string()),
+            Self::Int(i) => Some(i.to_string()),
+            Self::Bool(b) => Some(b.to_string()),
+            Self::String(s) => Some(s.to_owned()),
+            _ => None,
+        }
+    }
+
+    /// Is value some sort of number?
+    pub fn is_numeric(&self) -> bool {
+        matches!(self, Self::Float(_) | Self::Int(_) | Self::UInt(_))
+    }
+
+    /// Is value unknown?
+    pub fn is_unknown(&self) -> bool {
+        matches!(self, Self::Unknown)
+    }
+
+    /// Is value a boolean?
+    pub fn is_bool(&self) -> bool {
+        matches!(self, Self::Bool(_))
+    }
+
+    /// Is value a string?
+    pub fn is_str(&self) -> bool {
+        matches!(self, Self::String(_))
+    }
+
+    /// Is value a custom type?
+    pub fn is_custom(&self) -> bool {
+        matches!(self, Self::Custom(_))
+    }
+}
+
+impl<C> std::convert::From<f64> for Value<C> {
+    fn from(value: f64) -> Self {
+        Self::Float(value)
+    }
+}
+
+impl<C> std::convert::From<u64> for Value<C> {
+    fn from(value: u64) -> Self {
+        Self::UInt(value)
+    }
+}
+
+impl<C> std::convert::From<i64> for Value<C> {
+    fn from(value: i64) -> Self {
+        Self::Int(value)
+    }
+}
+
+impl<C> std::convert::From<bool> for Value<C> {
+    fn from(value: bool) -> Self {
+        Self::Bool(value)
+    }
+}
+
+impl<C> std::convert::From<String> for Value<C> {
+    fn from(value: String) -> Self {
+        Self::String(value)
+    }
+}
+
+impl<C> std::convert::From<&str> for Value<C> {
+    fn from(value: &str) -> Self {
+        Self::String(value.to_owned())
+    }
+}
+
+impl<B> Value<B> {
+
+    /// Convert standard value types between generic variants.
+    /// Fails if trying to convert between custom types
+    pub fn maybe_convert<A>(value: Value<A>) -> Option<Self> {
+        match value {
+            Value::<A>::Float(f) => Some(Value::<B>::Float(f)),
+            Value::<A>::UInt(u) => Some(Value::<B>::UInt(u)),
+            Value::<A>::Int(i) => Some(Value::<B>::Int(i)),
+            Value::<A>::Bool(b) => Some(Value::<B>::Bool(b)),
+            Value::<A>::String(s) => Some(Value::<B>::String(s)),
+            Value::<A>::Custom(_) => None,
+            Value::<A>::Unknown => Some(Value::Unknown),
+        }
+    }
+}
+
+impl Value {
+    /// Convert a specialised Value<A: Any> into a Value<Box<Any>>.
+    pub fn into_any<A: std::any::Any>(value: Value<A>) -> Self {
+        match value {
+            Value::<A>::Float(f) => Value::Float(f),
+            Value::<A>::UInt(u) => Value::UInt(u),
+            Value::<A>::Int(i) => Value::Int(i),
+            Value::<A>::Bool(b) => Value::Bool(b),
+            Value::<A>::String(s) => Value::String(s),
+            Value::<A>::Custom(c) => Value::Custom(Box::new(c)),
+            Value::<A>::Unknown => Value::Unknown,
+        }
+    }
+}
+
+/* If only this could not include the above types in C...
+impl<C> std::convert::From<C> for Value<C> {
+    fn from(value: C) -> Self {
+        Self::Custom(value)
+    }
+}
+*/

crates/core/src/support.rs

@@ -1,7 +1,11 @@
 /// Support status of a power interface
 pub enum Support {
+    /// Only read operations are supported
     Get,
+    /// Only write operations are supported
     Set,
+    /// Read and write are supported
     GetSet,
+    /// Nothing is supported
     Unsupported,
 }

crates/core/src/value.rs

@@ -1,67 +0,0 @@
-/// Value of a power reading
-pub enum Value<C = Box<dyn std::any::Any>> {
-    /// floating point value
-    Float(f64),
-    /// unsigned integer value
-    UInt(u64),
-    /// signed integer value
-    Int(i64),
-    /// boolean value
-    Bool(bool),
-    /// custom value
-    Custom(C),
-    /// unknown value
-    Unknown,
-}
-
-impl Value {
-    /// Convert to f64, if numeric type
-    pub fn as_f64(&self) -> Option<f64> {
-        match self {
-            Self::Float(f) => Some(*f),
-            Self::UInt(u) => Some(*u as _),
-            Self::Int(i) => Some(*i as _),
-            _ => None,
-        }
-    }
-
-    /// Convert to u64, if numeric type
-    pub fn as_u64(&self) -> Option<u64> {
-        match self {
-            Self::Float(f) => Some(*f as _),
-            Self::UInt(u) => Some(*u),
-            Self::Int(i) => Some(*i as _),
-            _ => None,
-        }
-    }
-
-    /// Convert to u64, if numeric type
-    pub fn as_i64(&self) -> Option<i64> {
-        match self {
-            Self::Float(f) => Some(*f as _),
-            Self::UInt(u) => Some(*u as _),
-            Self::Int(i) => Some(*i),
-            _ => None,
-        }
-    }
-
-    /// Is value some sort of number?
-    pub fn is_numeric(&self) -> bool {
-        matches!(self, Self::Float(_) | Self::Int(_) | Self::UInt(_))
-    }
-
-    /// Is value unknown?
-    pub fn is_unknown(&self) -> bool {
-        matches!(self, Self::Unknown)
-    }
-
-    /// Is value a boolean?
-    pub fn is_bool(&self) -> bool {
-        matches!(self, Self::Bool(_))
-    }
-
-    /// Is value a custom type?
-    pub fn is_custom(&self) -> bool {
-        matches!(self, Self::Custom(_))
-    }
-}

crates/procbox/Cargo.toml

@@ -7,3 +7,4 @@ description = "Power toolbox for processors"
 
 [dependencies]
 powerbox = { version = "0.1", path = "../core" }
+sysfuss = { version = "0.3", path = "../../../sysfs-nav" }

crates/procbox/src/cpu/basic.rs

@@ -0,0 +1,633 @@
+use powerbox::{Power, PowerOp};
+use powerbox::primitives::RangeList;
+use sysfuss::{BasicEntityPath, SysEntityAttributesExt};
+
+use super::{CpuPower, CpuPowerOp};
+
+const DEFAULT_CPU_ROOT: &str = "/sys/devices/system/cpu";
+const CPUS_PRESENT: &str = "present";
+const CPUS_POSSIBLE: &str = "possible";
+const CPUS_KERNEL_MAX: &str = "kernel_max";
+const CPUS_ONLINE: &str = "online";
+const CPUS_OFFLINE: &str = "offline";
+const CPUS_SMT_ACTIVE: &str = "smt/active";
+const CPUS_SMT_CONTROL: &str = "smt/control";
+
+/// General CPUs subsystem functionality
+pub struct BasicCpus {
+    sysfs: BasicEntityPath,
+}
+
+impl BasicCpus {
+    fn is_online(&self) -> bool {
+        self.sysfs.attribute::<String, _>(CPUS_PRESENT).is_ok_and(|s| s.trim_end() != "")
+    }
+
+    fn is_exists(&self) -> bool {
+        self.sysfs.as_ref().exists()
+    }
+
+    pub fn new() -> Self {
+        Self {
+            sysfs: BasicEntityPath::new(DEFAULT_CPU_ROOT),
+        }
+    }
+
+    pub fn with_root(p: impl AsRef<std::path::Path>) -> Self {
+        Self {
+            sysfs: BasicEntityPath::new(p),
+        }
+    }
+}
+
+pub enum BasicCpusOp {
+    SMT(SMT),
+    Present(GetPresent),
+    Possible(GetPossible),
+    KernelMax(GetKernelMax),
+    Online(GetCpusOnline),
+    Offline(GetCpusOffline),
+    //CpuFreq(),
+    //CpuIdle(),
+}
+
+impl PowerOp for BasicCpusOp {
+    fn is_eq_op(&self, other: &Self) -> bool {
+        match self {
+            Self::SMT(smt) => if let Self::SMT(other) = other { smt.is_eq_op(other) } else { false },
+            Self::Present(_) => matches!(other, Self::Present(_)),
+            Self::Possible(_) => matches!(other, Self::Possible(_)),
+            Self::KernelMax(_) => matches!(other, Self::KernelMax(_)),
+            Self::Online(_) => matches!(other, Self::Online(_)),
+            Self::Offline(_) => matches!(other, Self::Offline(_)),
+        }
+    }
+}
+
+impl CpuPowerOp for BasicCpusOp {}
+
+impl Power<BasicCpusOp, powerbox::primitives::Value<RangeList<usize>>> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=BasicCpusOp>> {
+        Box::new(
+            Power::<SMT, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into)
+                .chain(Power::<GetPresent, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into))
+                .chain(Power::<GetPossible, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into))
+                .chain(Power::<GetKernelMax, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into))
+                .chain(Power::<GetCpusOnline, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into))
+                .chain(Power::<GetCpusOffline, _>::supported_operations(self).map(core::convert::Into::<BasicCpusOp>::into))
+        )
+    }
+
+    fn act(&self, op: BasicCpusOp) -> Result<powerbox::primitives::Value<RangeList<usize>>, powerbox::PowerError> {
+        match op {
+            BasicCpusOp::SMT(smt) => Power::act(self, smt).map(|x| powerbox::primitives::Value::maybe_convert(x).unwrap()),
+            BasicCpusOp::Present(present) => Power::act(self, present).map(|x| powerbox::primitives::Value::Custom(x)),
+            BasicCpusOp::Possible(possible) => Power::act(self, possible).map(|x| powerbox::primitives::Value::Custom(x)),
+            BasicCpusOp::KernelMax(kmax) => Power::act(self, kmax).map(|x| powerbox::primitives::Value::UInt(x as _)),
+            BasicCpusOp::Online(onlines) => Power::act(self, onlines).map(|x| powerbox::primitives::Value::Custom(x)),
+            BasicCpusOp::Offline(offlines) => Power::act(self, offlines).map(|x| powerbox::primitives::Value::Custom(x)),
+        }
+    }
+}
+
+impl Power<BasicCpusOp> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=BasicCpusOp>> {
+        Power::<BasicCpusOp, powerbox::primitives::Value<RangeList<usize>>>::supported_operations(self)
+    }
+
+    fn act(&self, op: BasicCpusOp) -> Result<powerbox::primitives::Value, powerbox::PowerError> {
+        Power::<BasicCpusOp, powerbox::primitives::Value<RangeList<usize>>>::act(self, op)
+            .map(powerbox::primitives::Value::into_any)
+    }
+}
+
+impl CpuPower<BasicCpusOp> for BasicCpus {}
+
+pub struct SetSMT(pub bool);
+pub struct GetSMT;
+pub enum SMT {
+    Get(GetSMT),
+    Set(SetSMT),
+}
+
+impl PowerOp for SetSMT {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for SetSMT {}
+
+impl Power<SetSMT, ()> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=SetSMT>> {
+        if self.sysfs.exists(&CPUS_SMT_CONTROL) { Box::new(core::iter::once(SetSMT(true))) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, op: SetSMT) -> Result<(), powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_SMT_CONTROL) {
+            self.sysfs.set(CPUS_SMT_CONTROL, if op.0 { "on" } else { "off" }).map_err(powerbox::PowerError::Io)
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<SMT> for SetSMT {
+    fn into(self) -> SMT {
+        SMT::Set(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_set_smt {
+    use super::*;
+
+    #[test]
+    fn test_cpus_set_smt_fail() {
+        let target = BasicCpus::new();
+        assert!(Power::<SetSMT, _>::supported_operations(&target).count() == 1);
+        let result = target.act(SetSMT(true));
+        assert!(result.is_err());
+        let err = result.unwrap_err();
+        if let powerbox::PowerError::Io(io_err) = err {
+            assert_eq!(io_err.kind(), std::io::ErrorKind::PermissionDenied);
+        } else {
+            panic!("Expected IO error");
+        }
+    }
+}
+
+impl PowerOp for GetSMT {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetSMT {}
+
+impl Power<GetSMT, bool> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetSMT>> {
+        if self.sysfs.exists(&CPUS_SMT_ACTIVE) { Box::new(core::iter::once(GetSMT)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetSMT) -> Result<bool, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_SMT_ACTIVE) {
+            match self.sysfs.attribute::<String, _>(CPUS_SMT_ACTIVE) {
+                Ok(s) => Ok(s.trim_end() == "1"),
+                Err(sysfuss::EitherErr2::First(e)) => Err(powerbox::PowerError::Io(e)),
+                Err(sysfuss::EitherErr2::Second(_)) => panic!("Infallible error"),
+            }
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<SMT> for GetSMT {
+    fn into(self) -> SMT {
+        SMT::Get(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_get_smt {
+    use super::*;
+
+    #[test]
+    fn test_cpus_get_smt() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetSMT, _>::supported_operations(&target).count() == 1);
+        let smt = target.act(GetSMT)?;
+        assert_eq!(smt, true);
+        Ok(())
+    }
+}
+
+impl PowerOp for SMT {
+    fn is_eq_op(&self, other: &Self) -> bool {
+        match self {
+            Self::Get(_) => matches!(other, Self::Get(_)),
+            Self::Set(_) => matches!(other, Self::Set(_)),
+        }
+    }
+}
+
+impl CpuPowerOp for SMT {}
+
+impl Power<SMT> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=SMT>> {
+        Box::new(Power::<GetSMT, _>::supported_operations(self).map(core::convert::Into::<SMT>::into)
+            .chain(Power::<SetSMT, _>::supported_operations(self).map(core::convert::Into::<SMT>::into)))
+    }
+
+    fn act(&self, op: SMT) -> Result<powerbox::primitives::Value, powerbox::PowerError> {
+        match op {
+            SMT::Get(get) => Power::<GetSMT, _>::act(self, get).map(core::convert::Into::into),
+            SMT::Set(set) => Power::<SetSMT, _>::act(self, set).map(|_| powerbox::primitives::Value::Unknown),
+        }
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for SMT {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::SMT(self)
+    }
+}
+
+pub struct GetPresent; // Option<powerbox::primitives::RangeList<usize>
+impl PowerOp for GetPresent {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetPresent {}
+
+impl Power<GetPresent, RangeList<usize>> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetPresent>> {
+        if self.sysfs.exists(&CPUS_PRESENT) { Box::new(core::iter::once(GetPresent)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetPresent) -> Result<RangeList<usize>, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_PRESENT) {
+            self.sysfs.attribute::<RangeList<usize>, _>(CPUS_PRESENT).map_err(|e| match e {
+                sysfuss::EitherErr2::First(e) => powerbox::PowerError::Io(e),
+                sysfuss::EitherErr2::Second(_) => powerbox::PowerError::Unknown,
+            })
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for GetPresent {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::Present(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_present {
+    use super::*;
+    use powerbox::primitives::{RangeListItem, Range};
+
+    #[test]
+    fn test_cpus_present() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetPresent, _>::supported_operations(&target).count() == 1);
+        let rl = target.act(GetPresent)?;
+        assert_eq!(rl.items, vec![RangeListItem::Range(Range { min: 0, max: 15 })]);
+        Ok(())
+    }
+}
+
+pub struct GetPossible; // Option<powerbox::primitives::RangeList<usize>
+impl PowerOp for GetPossible {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetPossible {}
+
+impl Power<GetPossible, RangeList<usize>> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetPossible>> {
+        if self.sysfs.exists(&CPUS_POSSIBLE) { Box::new(core::iter::once(GetPossible)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetPossible) -> Result<RangeList<usize>, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_POSSIBLE) {
+            self.sysfs.attribute::<RangeList<usize>, _>(CPUS_POSSIBLE).map_err(|e| match e {
+                sysfuss::EitherErr2::First(e) => powerbox::PowerError::Io(e),
+                sysfuss::EitherErr2::Second(_) => powerbox::PowerError::Unknown,
+            })
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+
+
+#[cfg(test)]
+mod test_cpus_possible {
+    use super::*;
+    use powerbox::primitives::{RangeListItem, Range};
+
+    #[test]
+    fn test_cpus_possible() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetPossible, _>::supported_operations(&target).count() == 1);
+        let rl = target.act(GetPossible)?;
+        assert_eq!(rl.items, vec![RangeListItem::Range(Range { min: 0, max: 15 })]);
+        Ok(())
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for GetPossible {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::Possible(self)
+    }
+}
+
+pub struct GetKernelMax; // usize
+impl PowerOp for GetKernelMax {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetKernelMax {}
+
+impl Power<GetKernelMax, usize> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetKernelMax>> {
+        if self.sysfs.exists(&CPUS_KERNEL_MAX) { Box::new(core::iter::once(GetKernelMax)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetKernelMax) -> Result<usize, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_KERNEL_MAX) {
+            self.sysfs.attribute::<usize, _>(CPUS_KERNEL_MAX).map_err(|e| match e {
+                sysfuss::EitherErr2::First(e) => powerbox::PowerError::Io(e),
+                sysfuss::EitherErr2::Second(_) => powerbox::PowerError::Unknown,
+            })
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for GetKernelMax {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::KernelMax(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_kmax {
+    use super::*;
+
+    #[test]
+    fn test_cpus_kmax() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetKernelMax, _>::supported_operations(&target).count() == 1);
+        let kmax = target.act(GetKernelMax)?;
+        assert_eq!(kmax, 8191);
+        Ok(())
+    }
+}
+
+pub struct GetCpusOnline; // Option<powerbox::primitives::RangeList<usize>
+impl PowerOp for GetCpusOnline {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetCpusOnline {}
+
+impl Power<GetCpusOnline, RangeList<usize>> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetCpusOnline>> {
+        if self.sysfs.exists(&CPUS_ONLINE) { Box::new(core::iter::once(GetCpusOnline)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetCpusOnline) -> Result<RangeList<usize>, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_ONLINE) {
+            self.sysfs.attribute::<RangeList<usize>, _>(CPUS_ONLINE).map_err(|e| match e {
+                sysfuss::EitherErr2::First(e) => powerbox::PowerError::Io(e),
+                sysfuss::EitherErr2::Second(_) => powerbox::PowerError::Unknown,
+            })
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for GetCpusOnline {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::Online(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_online {
+    use super::*;
+    use powerbox::primitives::{RangeListItem, Range};
+
+    #[test]
+    fn test_cpus_online() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetCpusOnline, _>::supported_operations(&target).count() == 1);
+        let rl = target.act(GetCpusOnline)?;
+        assert_eq!(rl.items, vec![RangeListItem::Range(Range { min: 0, max: 15 })]);
+        Ok(())
+    }
+}
+
+pub struct GetCpusOffline; // Option<powerbox::primitives::RangeList<usize>
+impl PowerOp for GetCpusOffline {
+    fn is_eq_op(&self, _: &Self) -> bool {
+        true
+    }
+}
+
+impl CpuPowerOp for GetCpusOffline {}
+
+impl Power<GetCpusOffline, RangeList<usize>> for BasicCpus {
+    fn is_on(&self) -> bool {
+        self.is_online()
+    }
+
+    fn is_available(&self) -> bool {
+        self.is_exists()
+    }
+
+    fn supported_operations(&self) -> Box<dyn core::iter::Iterator<Item=GetCpusOffline>> {
+        if self.sysfs.exists(&CPUS_OFFLINE) { Box::new(core::iter::once(GetCpusOffline)) } else { Box::new(core::iter::empty()) }
+    }
+
+    fn act(&self, _: GetCpusOffline) -> Result<RangeList<usize>, powerbox::PowerError> {
+        if self.sysfs.exists(&CPUS_OFFLINE) {
+            self.sysfs.attribute::<RangeList<usize>, _>(CPUS_OFFLINE).map_err(|e| match e {
+                sysfuss::EitherErr2::First(e) => powerbox::PowerError::Io(e),
+                sysfuss::EitherErr2::Second(_) => powerbox::PowerError::Unknown,
+            })
+        } else {
+            Err(powerbox::PowerError::Unknown)
+        }
+    }
+}
+
+impl core::convert::Into<BasicCpusOp> for GetCpusOffline {
+    fn into(self) -> BasicCpusOp {
+        BasicCpusOp::Offline(self)
+    }
+}
+
+#[cfg(test)]
+mod test_cpus_offline {
+    use super::*;
+
+    #[test]
+    fn test_cpus_offline() -> Result<(), powerbox::PowerError> {
+        let target = BasicCpus::new();
+        assert!(Power::<GetCpusOffline, _>::supported_operations(&target).count() == 1);
+        let rl = target.act(GetCpusOffline)?;
+        assert_eq!(rl.items, vec![]);
+        Ok(())
+    }
+}
+
+/// General single CPU functionality
+pub struct BasicCpu {
+
+}
+
+pub enum BasicCpuOp {
+    Online(Online),
+    CpuFreq(CpuFreq),
+    //CpuIdle(),
+    //ACPI(),
+}
+
+pub struct SetCpuOnline(pub bool);
+pub struct GetCpuOnline;
+pub enum Online {
+    Get(GetCpuOnline),
+    Set(SetCpuOnline),
+}
+
+pub struct GetAffectedCpus; // range or number??
+pub struct GetRelatedCpus; // range or number??
+pub enum CpuFreq {
+    AffectedCpus(GetAffectedCpus),
+    RelatedCpus(GetRelatedCpus),
+    CpuInfo(CpuInfo),
+    Energy(EnergyPerf),
+    Scaling(),
+}
+
+pub struct GetCpuInfoMinFreq; // number
+pub struct GetCpuInfoMaxFreq; // number
+pub enum CpuInfo {
+    MinFreq(GetCpuInfoMinFreq),
+    MaxFreq(GetCpuInfoMaxFreq),
+}
+
+pub struct GetEnergyPerfAvailablePreferences; // list of string
+pub enum EnergyPerf {
+    AvailablePreferences(GetEnergyPerfAvailablePreferences),
+    Preference(EnergyPerfPreference),
+}
+
+pub struct GetEnergyPerfPreference; // string
+pub struct SetEnergyPerfPreference(String);
+pub enum EnergyPerfPreference {
+    Get(GetEnergyPerfPreference),
+    Set(SetEnergyPerfPreference)
+}
+
+pub struct GetScalingAvailableGovernors; // list of string
+pub struct GetScalingCurFreq; // number
+pub struct GetScalingDriver; // string
+pub enum Scaling {
+    AvailableGovernors(GetScalingAvailableGovernors),
+    CurFreq(GetScalingCurFreq),
+    Driver(GetScalingDriver),
+    Governor(ScalingGovernor),
+    MaxFreq(ScalingMaxFreq),
+    MinFreq(ScalingMinFreq),
+    //Setspeed(),
+}
+
+pub struct GetScalingGovernor; // string
+pub struct SetScalingGovernor(String);
+pub enum ScalingGovernor {
+    Get(GetScalingGovernor),
+    Set(SetScalingGovernor),
+}
+
+pub struct GetScalingMaxFreq; // number
+pub struct SetScalingMaxFreq(usize);
+pub enum ScalingMaxFreq {
+    Get(GetScalingMaxFreq),
+    Set(SetScalingMaxFreq),
+}
+
+pub struct GetScalingMinFreq; // number
+pub struct SetScalingMinFreq(usize);
+pub enum ScalingMinFreq {
+    Get(GetScalingMinFreq),
+    Set(SetScalingMinFreq),
+}

crates/procbox/src/cpu/cpu_trait.rs

@@ -1,5 +1,5 @@
 /// Power control interface for a CPU
-pub trait CpuPower<OP: CpuPowerOp, VAL = powerbox::Value>: powerbox::Power<OP, VAL> {}
+pub trait CpuPower<OP: CpuPowerOp, VAL = powerbox::primitives::Value>: powerbox::Power<OP, VAL> {}
 
 /// Power control operation(s) of a CPU
 pub trait CpuPowerOp: powerbox::PowerOp {}

crates/procbox/src/cpu/mod.rs

@@ -1,3 +1,7 @@
 //! CPU power management interface
 mod cpu_trait;
 pub use cpu_trait::{CpuPower, CpuPowerOp};
+
+#[allow(missing_docs)]
+pub mod basic;
+pub use basic::{BasicCpus, BasicCpu};

crates/procbox/src/gpu/gpu_trait.rs

@@ -1,5 +1,5 @@
 /// Power control interface for a GPU
-pub trait GpuPower<OP: GpuPowerOp, VAL = powerbox::Value>: powerbox::Power<OP, VAL> {}
+pub trait GpuPower<OP: GpuPowerOp, VAL = powerbox::primitives::Value>: powerbox::Power<OP, VAL> {}
 
 /// Power control operation(s) of a GPU
 pub trait GpuPowerOp: powerbox::PowerOp {}

crates/procbox/src/lib.rs

@@ -4,13 +4,4 @@
 pub mod cpu;
 pub mod gpu;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = 2 + 2;
-        assert_eq!(result, 4);
-    }
-}
+pub mod combo;

src/lib.rs

@@ -1,14 +0,0 @@
-pub fn add(left: usize, right: usize) -> usize {
-    left + right
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}

src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello powerbox-cli");
+}