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#ifndef GENERIC_H
#define GENERIC_H
#include <stdint.h>
#include <util/rblog.h>
RBLog<256, 2> usb_rblog;
struct desc_t {
uint32_t size;
void* data;
};
enum SetupStatus {Unhandled, Ok, Stall};
enum class EPType {Control, Bulk, Interrupt, Isochronous};
class USB_transfer {
friend class USB_generic;
public:
uint8_t ep;
uint8_t* buffer;
uint32_t buffer_len;
uint32_t xfer_len;
USB_transfer(uint8_t ep, uint8_t* buffer, uint32_t len) : ep(ep), buffer(buffer), buffer_len(len), xfer_len(0) {}
};
static USB_transfer STATUS_IN(0x80, nullptr, 0);
static USB_transfer DATA_IN(0x80, nullptr, 0);
class USB_class_driver {
friend class USB_generic;
protected:
virtual SetupStatus handle_setup(uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
return SetupStatus::Unhandled;
}
virtual void handle_set_configuration(uint8_t configuration) {}
virtual void handle_out(uint8_t ep, uint32_t len) {}
};
class USB_generic {
private:
desc_t dev_desc;
desc_t conf_desc;
USB_class_driver* class_drivers[4];
USB_class_driver* out_handlers[6];
uint8_t current_configuration;
public:
USB_generic(desc_t dev, desc_t conf) : dev_desc(dev), conf_desc(conf) {}
virtual void submit_transfer(USB_transfer& transfer) {
uint8_t in = transfer.ep & 0x80;
uint8_t ep = transfer.ep & 0x7f;
if(in) {
transfer.xfer_len = 0;
while(transfer.buffer_len - transfer.xfer_len > 64) {
hw_write(ep, (uint32_t*)(transfer.buffer + transfer.xfer_len), 64);
transfer.xfer_len += 64;
while(!ep_ready(ep));
}
hw_write(ep, (uint32_t*)(transfer.buffer + transfer.xfer_len), transfer.buffer_len - transfer.xfer_len);
transfer.xfer_len += transfer.buffer_len - transfer.xfer_len;
} else {
// TODO
}
}
virtual bool ep_ready(uint32_t ep) = 0;
virtual void hw_write(uint32_t ep, uint32_t* bufp, uint32_t len) = 0;
virtual uint32_t read(uint32_t ep, uint32_t* bufp, uint32_t len) = 0;
virtual void hw_set_address(uint8_t addr) = 0;
virtual void hw_conf_ep(uint8_t ep, EPType type, uint32_t size) = 0;
virtual void hw_set_stall(uint8_t ep) = 0;
bool register_driver(USB_class_driver* driver) {
for(USB_class_driver*& d : class_drivers) {
if(!d || d == driver) {
d = driver;
return true;
}
}
// Handler table is full.
return false;
}
bool register_out_handler(USB_class_driver* out_handler, uint8_t ep) {
if(ep >= sizeof(out_handlers) / sizeof(*out_handlers)) {
return false;
}
out_handlers[ep] = out_handler;
return true;
}
protected:
bool get_descriptor(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
desc_t* descp;
switch(wValue) {
case 0x100:
descp = &dev_desc;
break;
case 0x200:
descp = &conf_desc;
break;
default:
return false;
}
uint8_t* dp = (uint8_t*)descp->data;
uint32_t length = wLength > descp->size ? descp->size : wLength;
DATA_IN.buffer = dp;
DATA_IN.buffer_len = length;
submit_transfer(DATA_IN);
return true;
}
bool set_address(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
hw_set_address(wValue);
submit_transfer(STATUS_IN);
return true;
}
bool set_configuration(uint16_t wValue, uint16_t wIndex, uint16_t wLength) {
// TODO: Handle setting configuration after configuration is set.
if(wValue == current_configuration) {
// Keeping current configuration.
} else if(current_configuration) {
// Refusing to set a new configuration.
return false;
} else if(wValue == 1) {
// Setting configuration.
current_configuration = wValue;
for(USB_class_driver*& driver : class_drivers) {
if(driver) {
driver->handle_set_configuration(wValue);
}
}
} else {
// Unknown configuration.
return false;
}
submit_transfer(STATUS_IN);
return true;
}
void handle_reset() {
current_configuration = 0;
hw_conf_ep(0, EPType::Control, 64);
}
void handle_setup(const uint32_t* bufp) {
uint8_t bmRequestType = bufp[0] & 0xff;
uint8_t bRequest = (bufp[0] >> 8) & 0xff;
uint16_t wValue = (bufp[0] >> 16) & 0xffff;
uint16_t wIndex = bufp[1] & 0xffff;
uint16_t wLength = (bufp[1] >> 16) & 0xffff;
usb_rblog.log("handle_setup, bmRequestType=%02x, bRequest=%02x", bmRequestType, bRequest);
out_handlers[0] = nullptr;
// GET_DESCRIPTOR
if(bmRequestType == 0x80 && bRequest == 0x06) {
if(get_descriptor(wValue, wIndex, wLength)) {
return;
}
}
// SET_ADDRESS
if(bmRequestType == 0x00 && bRequest == 0x05) {
if(set_address(wValue, wIndex, wLength)) {
return;
}
}
// SET_CONFIGURATION
if(bmRequestType == 0x00 && bRequest == 0x09) {
if(set_configuration(wValue, wIndex, wLength)) {
return;
}
}
// SET_INTERFACE
if(bmRequestType == 0x01 && bRequest == 0x0b) {
// TODO: Don't ignore this request.
submit_transfer(STATUS_IN);
return;
}
SetupStatus res = SetupStatus::Unhandled;
for(USB_class_driver*& driver : class_drivers) {
if(driver) {
res = driver->handle_setup(bmRequestType, bRequest, wValue, wIndex, wLength);
if(res == SetupStatus::Ok) {
out_handlers[0] = driver;
}
if(res != SetupStatus::Unhandled) {
break;
}
}
}
if(res == SetupStatus::Ok) {
return;
}
hw_set_stall(0);
}
void handle_out(uint8_t ep, uint32_t len) {
usb_rblog.log("handle_out, ep=%02x, len=%d", ep, len);
if(out_handlers[ep]) {
out_handlers[ep]->handle_out(ep, len);
}
}
};
#endif
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