It's a major reorganization.

In order to add FIDO2 support, we need to reorganize some USB/CCID calls to specific area (named driver).
Thus, pico-hsm-sdk has two drivers:
- CCID driver implements APDU over USB/CCID ISO-7816 standard procedures.
- HID driver implements APDU over HID.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

src/usb/usb.h

@@ -0,0 +1,59 @@
+/*
+ * This file is part of the Pico HSM distribution (https://github.com/polhenarejos/pico-hsm).
+ * Copyright (c) 2022 Pol Henarejos.
+ *
+ * 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, version 3.
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _USB_H_
+#define _USB_H_
+
+#include "pico/util/queue.h"
+
+/* USB thread */
+#define EV_CARD_CHANGE        1
+#define EV_TX_FINISHED        2
+#define EV_EXEC_ACK_REQUIRED  4
+#define EV_EXEC_FINISHED      8
+#define EV_RX_DATA_READY     16
+#define EV_PRESS_BUTTON      32
+
+/* Card thread */
+#define EV_MODIFY_CMD_AVAILABLE   1
+#define EV_VERIFY_CMD_AVAILABLE   2
+#define EV_CMD_AVAILABLE          4
+#define EV_EXIT                   8
+#define EV_BUTTON_TIMEOUT        16
+#define EV_BUTTON_PRESSED        32
+
+extern void usb_task();
+extern queue_t usb_to_card_q;
+extern queue_t card_to_usb_q;
+extern int driver_process_usb_packet(uint16_t rx_read);
+extern void driver_exec_finished(size_t size_next);
+extern void driver_exec_finished_cont(size_t size_next, size_t offset);
+extern void driver_exec_timeout();
+extern bool driver_mounted();
+extern uint8_t *driver_prepare_response();
+
+extern void card_start();
+extern void card_exit();
+extern void usb_init();
+extern uint8_t *usb_prepare_response();
+extern void timeout_stop();
+extern void timeout_start();
+extern uint8_t *usb_get_rx();
+extern uint8_t *usb_get_tx();
+extern uint32_t usb_write_offset(uint16_t len, uint16_t offset);
+extern void usb_clear_rx();
+#endif