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authorBrian Cully <bjc@kublai.com>2019-08-04 15:30:26 -0400
committerBrian Cully <bjc@kublai.com>2019-08-04 16:04:19 -0400
commit4b961b6110e3c0a1b6bc67a7694651d689b553f9 (patch)
tree9f2551806ab9baad1fc96efca82859ec82fea1c5
downloadbootkbd-0.1.0.tar.gz
bootkbd-0.1.0.zip
Initial commitv0.1.0
-rw-r--r--.gitignore3
-rw-r--r--COPYING674
-rw-r--r--Cargo.toml15
-rw-r--r--README.md10
-rw-r--r--TODO.org9
-rwxr-xr-xsrc/lib.rs333
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diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+/target
+**/*.rs.bk
+Cargo.lock
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..f288702
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..4fc0fab
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "bootkbd"
+version = "0.1.0"
+description = "Boot-protocol keyboard driver for usb-host."
+authors = ["Brian Cully <bjc@kublai.com>"]
+edition = "2018"
+license = "GPL-3.0-or-later"
+categories = ["no-std", "embedded", "hardware-support"]
+keywords = ["usb", "usb-host", "hal", "peripheral"]
+readme = "README.md"
+repository = "https://github.com/bjc/bootkbd.git"
+
+[dependencies]
+usb-host = "~0.1"
+log = "~0.4"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6fda223
--- /dev/null
+++ b/README.md
@@ -0,0 +1,10 @@
+# bootkbd
+
+This is a (very) simple USB host-side driver for boot-protocol
+keyboards using the [usb-host](https://github.com/bjc/usb-host) trait
+library.
+
+# Hardware
+
+Tested on a Logitech G105 keyboard, but any other low-end keyboard
+should probably work.
diff --git a/TODO.org b/TODO.org
new file mode 100644
index 0000000..b210915
--- /dev/null
+++ b/TODO.org
@@ -0,0 +1,9 @@
+* Documentation
+ - README.md
+ - Literally every trait and method.
+
+* Parse HID descriptors.
+This driver currently assumes a fair amount of behavior on the part of
+the keyboard, which, for simple keyboards like the Logitech G105 I'm
+testing with, works. More complicated keyboards will probably require
+more in-depth probing and feature selection.
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100755
index 0000000..dde9e71
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,333 @@
+#![no_std]
+
+use log::{debug, error, info};
+use usb_host::{
+ ConfigurationDescriptor, DescriptorType, DeviceDescriptor, Direction, Driver, DriverError,
+ Endpoint, RequestCode, RequestDirection, RequestKind, RequestRecipient, RequestType,
+ TransferError, TransferType, USBHost, WValue,
+};
+
+use core::mem::{self, MaybeUninit};
+use core::ptr;
+
+// How long to wait before talking to the device again after setting
+// its address. cf ยง9.2.6.3 of USB 2.0
+const SETTLE_DELAY: usize = 2;
+
+// How many total devices this driver can support.
+const MAX_DEVICES: usize = 1;
+
+// And how many endpoints we can support per-device.
+const MAX_ENDPOINTS: usize = 2;
+
+pub struct BootKeyboard {
+ devices: [Option<Device>; MAX_DEVICES],
+}
+impl core::fmt::Debug for BootKeyboard {
+ fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+ write!(f, "BootKeyboard")
+ }
+}
+
+impl BootKeyboard {
+ pub fn new() -> Self {
+ Self {
+ devices: [None; MAX_DEVICES],
+ }
+ }
+}
+
+impl Driver for BootKeyboard {
+ fn want_device(&self, _device: &DeviceDescriptor) -> bool {
+ true
+ }
+
+ fn add_device(&mut self, _device: DeviceDescriptor, address: u8) -> Result<(), DriverError> {
+ for i in 0..self.devices.len() {
+ if self.devices[i].is_none() {
+ self.devices[i] = Some(Device::new(address));
+ return Ok(());
+ }
+ }
+ Err(DriverError::Permanent(address, "out of devices"))
+ }
+
+ fn remove_device(&mut self, address: u8) {
+ for i in 0..self.devices.len() {
+ if let Some(ref dev) = self.devices[i] {
+ if dev.addr == address {
+ self.devices[i] = None;
+ return;
+ }
+ }
+ }
+ }
+
+ fn tick(&mut self, millis: usize, host: &mut dyn USBHost) -> Result<(), DriverError> {
+ for d in &mut self.devices[..] {
+ if let Some(ref mut dev) = d {
+ if let Err(TransferError::Permanent(e)) = dev.fsm(millis, host) {
+ return Err(DriverError::Permanent(dev.addr, e));
+ }
+ }
+ }
+ Ok(())
+ }
+}
+
+#[derive(Copy, Clone, Debug, PartialEq)]
+enum DeviceState {
+ Addressed,
+ WaitForSettle(usize),
+ GetConfig,
+ SetConfig,
+ SetIdle,
+ SetReport,
+ Running,
+}
+
+struct Device {
+ addr: u8,
+ ep0: EP,
+ endpoints: [Option<EP>; MAX_ENDPOINTS],
+ state: DeviceState,
+}
+
+impl Device {
+ fn new(addr: u8) -> Self {
+ let endpoints: [Option<EP>; MAX_ENDPOINTS] = {
+ let mut eps: [MaybeUninit<Option<EP>>; MAX_ENDPOINTS] =
+ unsafe { mem::MaybeUninit::uninit().assume_init() };
+ for ep in &mut eps[..] {
+ unsafe { ptr::write(ep.as_mut_ptr(), None) }
+ }
+ unsafe { mem::transmute(eps) }
+ };
+
+ Self {
+ addr: addr,
+ ep0: EP::new(addr, 0, TransferType::Control, Direction::In),
+ endpoints: endpoints,
+ state: DeviceState::Addressed,
+ }
+ }
+
+ fn fsm(&mut self, millis: usize, host: &mut dyn USBHost) -> Result<(), TransferError> {
+ // TODO: either we need another `control_transfer` that
+ // doesn't take data, or this `none` value needs to be put in
+ // the usb-host layer. None of these options are good.
+ let none: Option<&mut [u8]> = None;
+ unsafe {
+ static mut LAST_STATE: DeviceState = DeviceState::Addressed;
+ if LAST_STATE != self.state {
+ debug!("{:?} -> {:?}", LAST_STATE, self.state);
+ LAST_STATE = self.state;
+ }
+ }
+
+ match self.state {
+ DeviceState::Addressed => {
+ self.state = DeviceState::WaitForSettle(millis + SETTLE_DELAY)
+ }
+
+ DeviceState::WaitForSettle(until) => {
+ if millis > until {
+ let mut dev_desc: MaybeUninit<DeviceDescriptor> = MaybeUninit::uninit();
+ let buf = unsafe { to_slice_mut(&mut dev_desc) };
+ let len = host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::DeviceToHost,
+ RequestKind::Standard,
+ RequestRecipient::Device,
+ )),
+ RequestCode::GetDescriptor,
+ WValue::from((0, DescriptorType::Device as u8)),
+ 0,
+ Some(buf),
+ )?;
+ assert!(len == mem::size_of::<DeviceDescriptor>());
+ self.state = DeviceState::GetConfig
+ }
+ }
+
+ DeviceState::GetConfig => {
+ let mut conf_desc: MaybeUninit<ConfigurationDescriptor> = MaybeUninit::uninit();
+ let buf = unsafe { to_slice_mut(&mut conf_desc) };
+ let len = host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::DeviceToHost,
+ RequestKind::Standard,
+ RequestRecipient::Device,
+ )),
+ RequestCode::GetDescriptor,
+ WValue::from((0, DescriptorType::Configuration as u8)),
+ 0,
+ Some(buf),
+ )?;
+ assert!(len == mem::size_of::<ConfigurationDescriptor>());
+ let conf_desc = unsafe { conf_desc.assume_init() };
+
+ // TODO: do a real allocation later.
+ assert!(conf_desc.w_total_length < 64);
+ let mut buf: [u8; 64] = [0; 64];
+ let mut tmp = &mut buf[..conf_desc.w_total_length as usize];
+ let len = host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::DeviceToHost,
+ RequestKind::Standard,
+ RequestRecipient::Device,
+ )),
+ RequestCode::GetDescriptor,
+ WValue::from((0, DescriptorType::Configuration as u8)),
+ 0,
+ Some(&mut tmp),
+ )?;
+ assert!(len == conf_desc.w_total_length as usize);
+
+ self.state = DeviceState::SetConfig
+ }
+
+ DeviceState::SetConfig => {
+ // TODO: extract real configuration to choose.
+ let conf: u8 = 1;
+ host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::HostToDevice,
+ RequestKind::Standard,
+ RequestRecipient::Device,
+ )),
+ RequestCode::SetConfiguration,
+ WValue::from((conf, 0)),
+ 0,
+ none,
+ )?;
+
+ self.endpoints[0] = Some(EP::new(
+ self.addr,
+ 1,
+ TransferType::Interrupt,
+ Direction::In,
+ ));
+
+ self.state = DeviceState::SetIdle
+ }
+
+ DeviceState::SetIdle => {
+ host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::HostToDevice,
+ RequestKind::Class,
+ RequestRecipient::Interface,
+ )),
+ RequestCode::GetInterface,
+ WValue::from((0, 0)),
+ 0,
+ none,
+ )?;
+ self.state = DeviceState::SetReport
+ }
+
+ DeviceState::SetReport => {
+ let mut report: [u8; 1] = [0];
+ host.control_transfer(
+ &mut self.ep0,
+ RequestType::from((
+ RequestDirection::HostToDevice,
+ RequestKind::Class,
+ RequestRecipient::Interface,
+ )),
+ RequestCode::SetConfiguration,
+ WValue::from((0, 2)),
+ 0,
+ Some(&mut report),
+ )?;
+
+ self.state = DeviceState::Running
+ }
+
+ DeviceState::Running => {
+ let mut buf: [u8; 8] = [0; 8];
+ if let Some(ref mut ep) = self.endpoints[0] {
+ match host.in_transfer(ep, &mut buf) {
+ Err(TransferError::Permanent(msg)) => error!("reading report: {}", msg),
+ Err(TransferError::Retry(_)) => return Ok(()),
+ Ok(len) => info!("report: {} - {:?}", len, buf),
+ }
+ }
+ }
+ }
+
+ Ok(())
+ }
+}
+
+unsafe fn to_slice_mut<T>(v: &mut T) -> &mut [u8] {
+ let ptr = v as *mut T as *mut u8;
+ let len = mem::size_of::<T>();
+ core::slice::from_raw_parts_mut(ptr, len)
+}
+
+struct EP {
+ addr: u8,
+ num: u8,
+ transfer_type: TransferType,
+ direction: Direction,
+ in_toggle: bool,
+ out_toggle: bool,
+}
+
+impl EP {
+ fn new(addr: u8, num: u8, transfer_type: TransferType, direction: Direction) -> Self {
+ Self {
+ addr: addr,
+ num: num,
+ transfer_type: transfer_type,
+ direction: direction,
+ in_toggle: false,
+ out_toggle: false,
+ }
+ }
+}
+
+impl Endpoint for EP {
+ fn address(&self) -> u8 {
+ self.addr
+ }
+
+ fn endpoint_num(&self) -> u8 {
+ self.num
+ }
+
+ fn transfer_type(&self) -> TransferType {
+ self.transfer_type
+ }
+
+ fn direction(&self) -> Direction {
+ self.direction
+ }
+
+ fn max_packet_size(&self) -> u16 {
+ 8
+ }
+
+ fn in_toggle(&self) -> bool {
+ self.in_toggle
+ }
+
+ fn set_in_toggle(&mut self, toggle: bool) {
+ self.in_toggle = toggle
+ }
+
+ fn out_toggle(&self) -> bool {
+ self.out_toggle
+ }
+
+ fn set_out_toggle(&mut self, toggle: bool) {
+ self.out_toggle = toggle
+ }
+}