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Kernel/USB: Add basic root port detection/management

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We can now read/write to the two root ports exposed to the
UHCI controller, and detect when a device is plugged in or
out via a kernel process that constantly scans the port
for any changes. This is very basic, but is a bit of fun to see
the kernel detecting hardware on the fly :^)
This commit is contained in:
Jesse Buhagiar 2021-01-03 00:12:54 +11:00 • committed by Andreas Kling
parent a5f895d251
commit 770a729e59
3 changed files with 65 additions and 1 deletions
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58
Kernel/Devices/USB/UHCIController.cpp
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@ -66,6 +66,18 @@ static constexpr u8 UHCI_USBINTR_SHORT_PACKET_INTR_ENABLE = 0x08;
static constexpr u16 UHCI_FRAMELIST_FRAME_COUNT = 1024; // Each entry is 4 bytes in our allocated page
static constexpr u16 UHCI_FRAMELIST_FRAME_INVALID = 0x0001;
// Port stuff
static constexpr u8 UHCI_ROOT_PORT_COUNT = 2;
static constexpr u16 UHCI_PORTSC_CURRRENT_CONNECT_STATUS = 0x0001;
static constexpr u16 UHCI_PORTSC_CONNECT_STATUS_CHANGED = 0x0002;
static constexpr u16 UHCI_PORTSC_PORT_ENABLED = 0x0004;
static constexpr u16 UHCI_PORTSC_PORT_ENABLE_CHANGED = 0x0008;
static constexpr u16 UHCI_PORTSC_LINE_STATUS = 0x0030;
static constexpr u16 UHCI_PORTSC_RESUME_DETECT = 0x40;
static constexpr u16 UHCI_PORTSC_LOW_SPEED_DEVICE = 0x0100;
static constexpr u16 UHCI_PORTSC_PORT_RESET = 0x0200;
static constexpr u16 UHCI_PORTSC_SUSPEND = 0x1000;
// *BSD and a few other drivers seem to use this number
static constexpr u8 UHCI_NUMBER_OF_ISOCHRONOUS_TDS = 128;
static constexpr u16 UHCI_NUMBER_OF_FRAMES = 1024;
@ -338,9 +350,53 @@ void UHCIController::start()
klog() << "UHCI: Started!";
}
void UHCIController::spawn_port_proc()
{
RefPtr<Thread> usb_hotplug_thread;
timespec sleep_time;
sleep_time.tv_sec = 1;
Process::create_kernel_process(usb_hotplug_thread, "UHCIHotplug", [sleep_time] {
for (;;) {
for (int port = 0; port < UHCI_ROOT_PORT_COUNT; port++) {
u16 port_data = 0;
if (port == 1) {
// Let's see what's happening on port 1
port_data = UHCIController::the().read_portsc1();
if (port_data & UHCI_PORTSC_CONNECT_STATUS_CHANGED) {
if (port_data & UHCI_PORTSC_CURRRENT_CONNECT_STATUS) {
klog() << "UHCI: Device attach detected on Root Port 1!";
} else {
klog() << "UHCI: Device detach detected on Root Port 1!";
}
UHCIController::the().write_portsc1(
UHCI_PORTSC_CONNECT_STATUS_CHANGED);
}
} else {
port_data = UHCIController::the().read_portsc2();
if (port_data & UHCI_PORTSC_CONNECT_STATUS_CHANGED) {
if (port_data & UHCI_PORTSC_CURRRENT_CONNECT_STATUS) {
klog() << "UHCI: Device attach detected on Root Port 2!";
} else {
klog() << "UHCI: Device detach detected on Root Port 2!";
}
UHCIController::the().write_portsc2(
UHCI_PORTSC_CONNECT_STATUS_CHANGED);
}
}
}
Thread::current()->sleep(sleep_time);
}
});
}
void UHCIController::handle_irq(const RegisterState&)
{
dbg() << "UHCI: Interrupt happened!";
klog() << "UHCI: Interrupt happened!";
klog() << "Value of USBSTS: " << read_usbsts();
}
}