Initial commitv0.1.0

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diff --git a/.gitignore 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
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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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 §9.2.6.3 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
+    }
+}