[gnome-color-manager: 4/80] Send 8 bytes of zero data to the HUEY

[Richard Hughes <rhughes src gnome org>]

commit 2b80915491568aa479bb4cf47b3ae75931785c88
Author: Richard Hughes <richard hughsie com>
Date:   Sat Jul 17 22:38:55 2010 +0100

    Send 8 bytes of zero data to the HUEY

 src/gcm-huey-example.c |   59 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 57 insertions(+), 2 deletions(-)
---
diff --git a/src/gcm-huey-example.c b/src/gcm-huey-example.c
index 7637b78..05ab000 100644
--- a/src/gcm-huey-example.c
+++ b/src/gcm-huey-example.c
@@ -32,10 +32,12 @@
 
 #define HUEY_VENDOR_ID			0x0971
 #define HUEY_PRODUCT_ID			0x2005
+#define HUEY_CONTROL_MESSAGE_TIMEOUT	5000 /* ms */
 
 typedef struct {
-	gboolean	 connected;
-	libusb_device	*device;
+	gboolean		 connected;
+	libusb_device		*device;
+	libusb_device_handle	*handle;
 } GcmPriv;
 
 static gboolean
@@ -83,6 +85,28 @@ gcm_find_device (GcmPriv *priv, GError **error)
 		g_set_error_literal (error, 1, 0, "no compatible hardware attached");
 		goto out;
 	}
+
+	/* open device */
+	retval = libusb_open (priv->device, &priv->handle);
+	if (retval < 0) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "failed to open device: %s", libusb_strerror (retval));
+		goto out;
+	}
+
+	/* set configuration and interface, the only values we've got in lsusb-vvv */
+	retval = libusb_set_configuration (priv->handle, 1);
+	if (retval < 0) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "failed to set configuration: %s", libusb_strerror (retval));
+		goto out;
+	}
+	retval = libusb_claim_interface (priv->handle, 0);
+	if (retval < 0) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "failed to claim interface: %s", libusb_strerror (retval));
+		goto out;
+	}
 out:
 	libusb_free_device_list (devs, 1);
 	return ret;
@@ -95,6 +119,9 @@ main (void)
 	gboolean ret;
 	GcmPriv *priv;
 	GError *error = NULL;
+	guchar *data;
+	gint bytes_read = 0;
+	guint i;
 
 	priv = g_new0 (GcmPriv, 1);
 
@@ -114,8 +141,36 @@ main (void)
 		goto out;
 	}
 
+	/* according to wMaxPacketSize, all the messages have just 8 bytes */
+	data = g_new0 (guchar, 8);
+	retval = libusb_control_transfer (priv->handle,
+					  LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE,
+					  0x09, 0x0200, 0,
+					  data, 8,
+					  HUEY_CONTROL_MESSAGE_TIMEOUT);
+	if (retval < 0) {
+		g_warning ("failed to send message interface: %s", libusb_strerror (retval));
+		goto out;
+	}
+
+	/* get response, from bEndpointAddress */
+	retval = libusb_interrupt_transfer (priv->handle, 0x81, data, 8, &bytes_read, HUEY_CONTROL_MESSAGE_TIMEOUT);
+	if (retval < 0) {
+		g_warning ("failed to recieve message interface: %s", libusb_strerror (retval));
+		goto out;
+	}
+
+	for (i=0; i< (guint)bytes_read; i++)
+		g_print ("%02x [%c]\t", data[i], g_ascii_isprint (data[i]) ? data[i] : '?');
+
+	g_print ("\n");
+	g_free (data);
+
 	/* do something */
 	g_warning ("fixme");
+
+	/* close device */
+	libusb_close (priv->handle);
 out:
 	if (priv->device != NULL)
 		libusb_unref_device (priv->device);