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/loopback.c b/drivers/usb/function/loopback.c
new file mode 100644
index 0000000..d7c93a3
--- /dev/null
+++ b/drivers/usb/function/loopback.c
@@ -0,0 +1,128 @@
+/* drivers/usb/function/loopback.c
+ *
+ * Simple Loopback Function Device
+ *
+ * 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 loopback_context
+{
+ struct usb_endpoint *out;
+ struct usb_endpoint *in;
+ struct usb_request *req_out;
+ struct usb_request *req_in;
+};
+
+static struct loopback_context _context;
+
+static void loopback_bind(struct usb_endpoint **ept, void *_ctxt)
+{
+ struct loopback_context *ctxt = _ctxt;
+
+ ctxt->out = ept[0];
+ ctxt->in = ept[1];
+
+ printk(KERN_INFO "loopback_bind() %p, %p\n", ctxt->out, ctxt->in);
+
+ ctxt->req_out = usb_ept_alloc_req(ctxt->out, 4096);
+ ctxt->req_in = usb_ept_alloc_req(ctxt->in, 4096);
+}
+
+static void loopback_queue_in(struct loopback_context *ctxt, void *data, unsigned len);
+static void loopback_queue_out(struct loopback_context *ctxt);
+
+static void loopback_in_complete(struct usb_endpoint *ept, struct usb_request *req)
+{
+ struct loopback_context *ctxt = req->context;
+ printk(KERN_INFO "loopback_out_complete (%d)\n", req->actual);
+ loopback_queue_out(ctxt);
+}
+
+static void loopback_out_complete(struct usb_endpoint *ept, struct usb_request *req)
+{
+ struct loopback_context *ctxt = req->context;
+ printk(KERN_INFO "loopback_in_complete (%d)\n", req->actual);
+
+ if (req->status == 0) {
+ loopback_queue_in(ctxt, req->buf, req->actual);
+ } else {
+ loopback_queue_out(ctxt);
+ }
+}
+
+static void loopback_queue_out(struct loopback_context *ctxt)
+{
+ struct usb_request *req = ctxt->req_out;
+
+ req->complete = loopback_out_complete;
+ req->context = ctxt;
+ req->length = 4096;
+
+ usb_ept_queue_xfer(ctxt->out, req);
+}
+
+static void loopback_queue_in(struct loopback_context *ctxt, void *data, unsigned len)
+{
+ struct usb_request *req = ctxt->req_in;
+
+ memcpy(req->buf, data, len);
+ req->complete = loopback_in_complete;
+ req->context = ctxt;
+ req->length = len;
+
+ usb_ept_queue_xfer(ctxt->in, req);
+}
+
+static void loopback_configure(int configured, void *_ctxt)
+{
+ struct loopback_context *ctxt = _ctxt;
+ printk(KERN_INFO "loopback_configure() %d\n", configured);
+
+ if (configured) {
+ loopback_queue_out(ctxt);
+ } else {
+ /* all pending requests will be canceled */
+ }
+}
+
+static struct usb_function usb_func_loopback = {
+ .bind = loopback_bind,
+ .configure = loopback_configure,
+
+ .name = "loopback",
+ .context = &_context,
+
+ .ifc_class = 0xff,
+ .ifc_subclass = 0xff,
+ .ifc_protocol = 0xff,
+
+ .ifc_name = "loopback",
+
+ .ifc_ept_count = 2,
+ .ifc_ept_type = { EPT_BULK_OUT, EPT_BULK_IN },
+};
+
+static int __init loopback_init(void)
+{
+ printk(KERN_INFO "loopback_init()\n");
+ return usb_function_register(&usb_func_loopback);
+}
+
+module_init(loopback_init);