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Add TryFrom implementation for PciClassCode

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This is useful for example when parsing numeric PCI class code values
from the command line.

BUG=b:167947780
TEST=None

Change-Id: I55515af2fa7e38bc26f4c2eebb083f1e45aebf22
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3245496
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Mattias Nissler <mnissler@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
This commit is contained in:
Mattias Nissler 2021-10-26 10:55:44 +00:00 committed by Commit Bot
parent 441a68194a
commit fce74e6fc2
1 changed files with 22 additions and 1 deletions
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23
devices/src/pci/pci_configuration.rs
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@ -2,6 +2,7 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::convert::TryFrom;
use std::convert::TryInto;
use base::warn;
@ -44,7 +45,7 @@ pub enum PciHeaderType {
/// Classes of PCI nodes.
#[allow(dead_code)]
#[derive(Copy, Clone)]
#[derive(Copy, Clone, enumn::N)]
pub enum PciClassCode {
TooOld,
MassStorage,
@ -61,8 +62,11 @@ pub enum PciClassCode {
SerialBusController,
WirelessController,
IntelligentIoController,
SatelliteCommunicationController,
EncryptionController,
DataAcquisitionSignalProcessing,
ProcessingAccelerator,
NonEssentialInstrumentation,
Other = 0xff,
}
@ -72,6 +76,23 @@ impl PciClassCode {
}
}
#[sorted]
#[derive(Error, Debug)]
pub enum PciClassCodeParseError {
#[error("Unknown class code")]
Unknown,
}
impl TryFrom<u8> for PciClassCode {
type Error = PciClassCodeParseError;
fn try_from(v: u8) -> std::result::Result<PciClassCode, PciClassCodeParseError> {
match PciClassCode::n(v) {
Some(class) => Ok(class),
None => Err(PciClassCodeParseError::Unknown),
}
}
}
/// A PCI sublcass. Each class in `PciClassCode` can specify a unique set of subclasses. This trait
/// is implemented by each subclass. It allows use of a trait object to generate configurations.
pub trait PciSubclass {