From 49301d1b2881bbb020f2dd4a8799bc3400a9136c Mon Sep 17 00:00:00 2001
From: Jef Driesen <jefdriesen@users.sourceforge.net>
Date: Fri, 10 Apr 2009 09:20:48 +0000
Subject: [PATCH] Implement the fingerprint function.

---
 src/oceanic_atom2.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/oceanic_atom2.c b/src/oceanic_atom2.c
index b7e408b..2a138f0 100644
--- a/src/oceanic_atom2.c
+++ b/src/oceanic_atom2.c
@@ -43,6 +43,9 @@
 	rc == -1 ? DEVICE_STATUS_IO : DEVICE_STATUS_TIMEOUT \
 )
 
+#define FP_OFFSET 0
+#define FP_SIZE   8
+
 #define ACK 0x5A
 #define NAK 0xA5
 
@@ -64,8 +67,10 @@
 typedef struct oceanic_atom2_device_t {
 	device_t base;
 	struct serial *port;
+	unsigned char fingerprint[FP_SIZE];
 } oceanic_atom2_device_t;
 
+static device_status_t oceanic_atom2_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size);
 static device_status_t oceanic_atom2_device_version (device_t *abstract, unsigned char data[], unsigned int size);
 static device_status_t oceanic_atom2_device_read (device_t *abstract, unsigned int address, unsigned char data[], unsigned int size);
 static device_status_t oceanic_atom2_device_write (device_t *abstract, unsigned int address, const unsigned char data[], unsigned int size);
@@ -75,7 +80,7 @@ static device_status_t oceanic_atom2_device_close (device_t *abstract);
 
 static const device_backend_t oceanic_atom2_device_backend = {
 	DEVICE_TYPE_OCEANIC_ATOM2,
-	NULL, /* set_fingerprint */
+	oceanic_atom2_device_set_fingerprint, /* set_fingerprint */
 	NULL, /* handshake */
 	oceanic_atom2_device_version, /* version */
 	oceanic_atom2_device_read, /* read */
@@ -246,6 +251,7 @@ oceanic_atom2_device_open (device_t **out, const char* name)
 
 	// Set the default values.
 	device->port = NULL;
+	memset (device->fingerprint, 0, FP_SIZE);
 
 	// Open the device.
 	int rc = serial_open (&device->port, name);
@@ -287,6 +293,26 @@ oceanic_atom2_device_open (device_t **out, const char* name)
 }
 
 
+static device_status_t
+oceanic_atom2_device_set_fingerprint (device_t *abstract, const unsigned char data[], unsigned int size)
+{
+	oceanic_atom2_device_t *device = (oceanic_atom2_device_t*) abstract;
+
+	if (! device_is_oceanic_atom2 (abstract))
+		return DEVICE_STATUS_TYPE_MISMATCH;
+
+	if (size && size != FP_SIZE)
+		return DEVICE_STATUS_ERROR;
+
+	if (size)
+		memcpy (device->fingerprint, data, FP_SIZE);
+	else
+		memset (device->fingerprint, 0, FP_SIZE);
+
+	return DEVICE_STATUS_SUCCESS;
+}
+
+
 static device_status_t
 oceanic_atom2_device_close (device_t *abstract)
 {