From 0f6eeff486642e26750fa364a488d25d63acd93b Mon Sep 17 00:00:00 2001
From: Mirna <mshetairy@google.com>
Date: Mon, 12 Oct 2020 11:08:33 +0200
Subject: [PATCH] Add NFC driver to third_party/libtock-drivers/

---
 third_party/libtock-drivers/src/lib.rs |  1 +
 third_party/libtock-drivers/src/nfc.rs | 66 ++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 third_party/libtock-drivers/src/nfc.rs

diff --git a/third_party/libtock-drivers/src/lib.rs b/third_party/libtock-drivers/src/lib.rs
index bf62d05..e498a37 100644
--- a/third_party/libtock-drivers/src/lib.rs
+++ b/third_party/libtock-drivers/src/lib.rs
@@ -8,3 +8,4 @@ pub mod rng;
 pub mod timer;
 pub mod usb_ctap_hid;
 pub mod util;
+pub mod nfc;
diff --git a/third_party/libtock-drivers/src/nfc.rs b/third_party/libtock-drivers/src/nfc.rs
new file mode 100644
index 0000000..ee2dda3
--- /dev/null
+++ b/third_party/libtock-drivers/src/nfc.rs
@@ -0,0 +1,66 @@
+use crate::util;
+use core::cell::Cell;
+use libtock_core::{callback, syscalls};
+
+const DRIVER_NUMBER: usize = 0x30003;
+
+mod command_nr {
+    pub const TRANSMIT: usize = 1;
+    pub const RECEIVE: usize = 2;
+    pub const EMULATE: usize = 3;
+    pub const CONFIGURE: usize = 4;
+}
+
+mod subscribe_nr {
+    pub const TRANSMIT: usize = 1;
+    pub const RECEIVE: usize = 2;
+    pub const SELECT: usize = 3;
+}
+
+mod allow_nr {
+    pub const TRANSMIT: usize = 1;
+    pub const RECEIVE: usize = 2;
+}
+
+pub const TX_BUFFER_SIZE: usize = 256;
+pub const RX_BUFFER_SIZE: usize = 256;
+
+pub struct NfcTag {
+    tx_buffer: [u8; BUFFER_SIZE],
+    rx_buffer: [u8; BUFFER_SIZE],
+    tag_type: u8,
+}
+
+impl NfcTag {
+    pub fn new() -> Console {
+        Console {
+            tx_buffer: [0; TX_BUFFER_SIZE],
+            tx_buffer: [0; RX_BUFFER_SIZE],
+            tag_type: 0,
+        }
+    }
+
+    pub fn set_tag_type(&mut self, type: u8) {
+        self.tag_type = type;
+    }
+
+    pub fn selected(&self) -> bool {
+        let is_selected = Cell::new(false);
+        let mut is_selected_alarm = || is_selected.set(true);
+        let subscription = syscalls::subscribe::<callback::Identity0Consumer, _>(
+            DRIVER_NUMBER,
+            subscribe_nr::SELECT,
+            &mut is_selected_alarm,
+        );
+        if subscription.is_err() {
+            return;
+        }
+
+        util::yieldk_for(|| is_selected.get());
+        true
+    }
+
+    pub fn receive(&self) {
+
+    }
+}