mirror of
https://github.com/trezor/trezor-firmware.git
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118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __TREZORHAL_USB_H__
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#define __TREZORHAL_USB_H__
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#include <stdint.h>
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#include "secbool.h"
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#include "usb_hid.h"
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#include "usb_vcp.h"
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#include "usb_webusb.h"
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// clang-format off
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//
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// USB stack high-level state machine
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// ------------------------------------
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//
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// +---------------+
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// ----> | Uninitialized | - Stack is completely uninitialized
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// | +---------------+
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// | |
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// | usb_init()
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// usb_deinit() |
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// | v
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// | +---------------+ - Stack is partially initialized
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// |-----| Initialized | - Ready for class registration
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// | +---------------+
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// | |
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// | N x usb_xxx_add() - Multiple class drivers can be registered
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// | |
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// | v
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// | +---------------+ - Stack is completely initialized
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// |-----| Stopped | - USB hardware left uninitialized
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// | +---------------+ - Can go low power at this mode
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// | | ^
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// | usb_start() |
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// | | usb_stop()
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// | v |
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// | +---------------+ - USB hardware initialized
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// ------| Running | - Stack is running if the USB host is connected
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// +---------------+
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//
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// clang-format on
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typedef struct {
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uint8_t device_class;
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uint8_t device_subclass;
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uint8_t device_protocol;
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uint16_t vendor_id;
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uint16_t product_id;
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uint16_t release_num;
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const char *manufacturer;
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const char *product;
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const char *serial_number;
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const char *interface;
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secbool usb21_enabled;
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secbool usb21_landing;
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} usb_dev_info_t;
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// Initializes USB stack
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//
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// When the USB driver is initialized, class drivers can be registered.
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// After all class drivers are registered, `usb_start()` can be called.
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//
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// Returns `sectrue` if the initialization is successful.
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secbool usb_init(const usb_dev_info_t *dev_info);
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// Deinitialize USB stack
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//
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// This function completely deinitializes the USB driver and all class drivers.
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// After this function is called, `usb_init()` can be called again.
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void usb_deinit(void);
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// Starts USB driver and its class drivers
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//
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// Initializes the USB stack (and hardware) and starts all registered class
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// drivers.
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//
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// This function can called after all class drivers are registered or after
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// `usb_stop()` is called.
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//
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// Returns `sectrue` if the USB stack is started successfully.
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secbool usb_start(void);
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// Stops USB driver and its class drivers
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//
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// Unitializes the USB stack (and hardware) but leaves all configuration intact,
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// so it can be started again with `usb_start()`.
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//
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// When the USB stack is stopped, it does not respond to any USB events and
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// the CPU can go to stop/standby mode.
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void usb_stop(void);
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// Returns `sectrue` if the device is connected to the host (or is expected to
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// be)
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//
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// TODO: Review and clarify the logic of this function in the future
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secbool usb_configured(void);
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#endif
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