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/ccid/ccid.h

@@ -0,0 +1,49 @@
+/*
+ * This file is part of the Pico HSM SDK distribution (https://github.com/polhenarejos/pico-hsm-sdk).
+ * 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 _CCID_H_
+#define _CCID_H_
+
+extern const uint8_t historical_bytes[];
+
+#define MAX_CMD_APDU_DATA_SIZE (24+4+512*4)
+#define MAX_RES_APDU_DATA_SIZE (5+9+512*4)
+#define CCID_MSG_HEADER_SIZE    10
+#define USB_LL_BUF_SIZE         64
+
+enum ccid_state {
+    CCID_STATE_NOCARD,		/* No card available */
+    CCID_STATE_START,		/* Initial */
+    CCID_STATE_WAIT,		/* Waiting APDU */
+
+    CCID_STATE_EXECUTE,		/* Executing command */
+    CCID_STATE_ACK_REQUIRED_0,	/* Ack required (executing)*/
+    CCID_STATE_ACK_REQUIRED_1,	/* Waiting user's ACK (execution finished) */
+
+    CCID_STATE_EXITED,		/* CCID Thread Terminated */
+    CCID_STATE_EXEC_REQUESTED,	/* Exec requested */
+};
+
+extern const uint8_t *ccid_atr;
+
+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 uint16_t usb_read_available();
+extern void usb_clear_rx();
+extern uint32_t usb_write_flush();
+#endif //_CCID_H_