Initial Contribution

msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142

Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
diff --git a/drivers/usb/function/null.c b/drivers/usb/function/null.c
new file mode 100644
index 0000000..68f1e35
--- /dev/null
+++ b/drivers/usb/function/null.c
@@ -0,0 +1,118 @@
+/* driver/usb/function/null.c
+ *
+ * Null Function Device - A Data Sink
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "usb_function.h"
+
+struct null_context
+{
+	struct usb_endpoint *out;
+	struct usb_request *req0;
+	struct usb_request *req1;
+};
+
+static struct null_context _context;
+
+static void null_bind(struct usb_endpoint **ept, void *_ctxt)
+{
+	struct null_context *ctxt = _ctxt;
+	ctxt->out = ept[0];
+	printk(KERN_INFO "null_bind() %p\n", ctxt->out);
+
+	ctxt->req0 = usb_ept_alloc_req(ctxt->out, 4096);
+	ctxt->req1 = usb_ept_alloc_req(ctxt->out, 4096);
+}
+
+static void null_unbind(void *_ctxt)
+{
+	struct null_context *ctxt = _ctxt;
+	printk(KERN_INFO "null_unbind()\n");
+	if (ctxt->req0) {
+		usb_ept_free_req(ctxt->out, ctxt->req0);
+		ctxt->req0 = 0;
+	}
+	if (ctxt->req1) {
+		usb_ept_free_req(ctxt->out, ctxt->req1);
+		ctxt->req1 = 0;
+	}
+	ctxt->out = 0;
+}
+
+
+static void null_queue_out(struct null_context *ctxt, struct usb_request *req);
+
+static void null_out_complete(struct usb_endpoint *ept, struct usb_request *req)
+{
+	struct null_context *ctxt = req->context;
+	unsigned char *data = req->buf;
+
+	if (req->status != -ENODEV)
+		null_queue_out(ctxt, req);
+}
+
+static void null_queue_out(struct null_context *ctxt, struct usb_request *req)
+{
+	req->complete = null_out_complete;
+	req->context = ctxt;
+	req->length = 4096;
+
+	usb_ept_queue_xfer(ctxt->out, req);
+}
+
+static void null_configure(int configured, void *_ctxt)
+{
+	struct null_context *ctxt = _ctxt;
+	printk(KERN_INFO "null_configure() %d\n", configured);
+
+	if (configured) {
+		null_queue_out(ctxt, ctxt->req0);
+		null_queue_out(ctxt, ctxt->req1);
+	} else {
+		/* all pending requests will be canceled */
+	}
+}
+
+static struct usb_function usb_func_null = {
+	.bind = null_bind,
+	.unbind = null_unbind,
+	.configure = null_configure,
+
+	.name = "null",
+	.context = &_context,
+
+	.ifc_class = 0xff,
+	.ifc_subclass = 0xfe,
+	.ifc_protocol = 0x01,
+
+	.ifc_name = "null",
+
+	.ifc_ept_count = 1,
+	.ifc_ept_type = { EPT_BULK_OUT },
+};
+
+static int __init null_init(void)
+{
+	printk(KERN_INFO "null_init()\n");
+	usb_function_register(&usb_func_null);
+	return 0;
+}
+
+module_init(null_init);