3f2bc4d6eb
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142 Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/* drivers/usb/function/loopback.c
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*
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* Simple Loopback Function Device
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*
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* Copyright (C) 2007 Google, Inc.
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* Author: Brian Swetland <swetland@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include "usb_function.h"
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struct loopback_context
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{
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struct usb_endpoint *out;
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struct usb_endpoint *in;
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struct usb_request *req_out;
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struct usb_request *req_in;
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};
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static struct loopback_context _context;
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static void loopback_bind(struct usb_endpoint **ept, void *_ctxt)
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{
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struct loopback_context *ctxt = _ctxt;
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ctxt->out = ept[0];
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ctxt->in = ept[1];
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printk(KERN_INFO "loopback_bind() %p, %p\n", ctxt->out, ctxt->in);
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ctxt->req_out = usb_ept_alloc_req(ctxt->out, 4096);
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ctxt->req_in = usb_ept_alloc_req(ctxt->in, 4096);
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}
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static void loopback_queue_in(struct loopback_context *ctxt, void *data, unsigned len);
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static void loopback_queue_out(struct loopback_context *ctxt);
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static void loopback_in_complete(struct usb_endpoint *ept, struct usb_request *req)
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{
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struct loopback_context *ctxt = req->context;
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printk(KERN_INFO "loopback_out_complete (%d)\n", req->actual);
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loopback_queue_out(ctxt);
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}
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static void loopback_out_complete(struct usb_endpoint *ept, struct usb_request *req)
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{
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struct loopback_context *ctxt = req->context;
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printk(KERN_INFO "loopback_in_complete (%d)\n", req->actual);
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if (req->status == 0) {
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loopback_queue_in(ctxt, req->buf, req->actual);
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} else {
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loopback_queue_out(ctxt);
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}
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}
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static void loopback_queue_out(struct loopback_context *ctxt)
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{
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struct usb_request *req = ctxt->req_out;
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req->complete = loopback_out_complete;
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req->context = ctxt;
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req->length = 4096;
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usb_ept_queue_xfer(ctxt->out, req);
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}
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static void loopback_queue_in(struct loopback_context *ctxt, void *data, unsigned len)
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{
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struct usb_request *req = ctxt->req_in;
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memcpy(req->buf, data, len);
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req->complete = loopback_in_complete;
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req->context = ctxt;
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req->length = len;
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usb_ept_queue_xfer(ctxt->in, req);
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}
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static void loopback_configure(int configured, void *_ctxt)
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{
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struct loopback_context *ctxt = _ctxt;
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printk(KERN_INFO "loopback_configure() %d\n", configured);
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if (configured) {
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loopback_queue_out(ctxt);
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} else {
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/* all pending requests will be canceled */
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}
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}
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static struct usb_function usb_func_loopback = {
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.bind = loopback_bind,
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.configure = loopback_configure,
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.name = "loopback",
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.context = &_context,
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.ifc_class = 0xff,
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.ifc_subclass = 0xff,
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.ifc_protocol = 0xff,
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.ifc_name = "loopback",
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.ifc_ept_count = 2,
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.ifc_ept_type = { EPT_BULK_OUT, EPT_BULK_IN },
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};
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static int __init loopback_init(void)
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{
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printk(KERN_INFO "loopback_init()\n");
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return usb_function_register(&usb_func_loopback);
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}
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module_init(loopback_init);
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