3f2bc4d6eb
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142 Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/* driver/usb/function/zero.c
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*
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* Zero Function Device - A Trivial Data Source
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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 zero_context
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{
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struct usb_endpoint *in;
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struct usb_request *req0;
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struct usb_request *req1;
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};
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static struct zero_context _context;
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static void zero_bind(struct usb_endpoint **ept, void *_ctxt)
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{
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struct zero_context *ctxt = _ctxt;
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ctxt->in = ept[0];
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printk(KERN_INFO "zero_bind() %p\n", ctxt->in);
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ctxt->req0 = usb_ept_alloc_req(ctxt->in, 4096);
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ctxt->req1 = usb_ept_alloc_req(ctxt->in, 4096);
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memset(ctxt->req0->buf, 0, 4096);
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memset(ctxt->req1->buf, 0, 4096);
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}
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static void zero_unbind(void *_ctxt)
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{
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struct zero_context *ctxt = _ctxt;
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printk(KERN_INFO "null_unbind()\n");
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if (ctxt->req0) {
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usb_ept_free_req(ctxt->in, ctxt->req0);
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ctxt->req0 = 0;
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}
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if (ctxt->req1) {
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usb_ept_free_req(ctxt->in, ctxt->req1);
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ctxt->req1 = 0;
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}
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ctxt->in = 0;
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}
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static void zero_queue_in(struct zero_context *ctxt, struct usb_request *req);
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static void zero_in_complete(struct usb_endpoint *ept, struct usb_request *req)
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{
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struct zero_context *ctxt = req->context;
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unsigned char *data = req->buf;
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if (req->status != -ENODEV)
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zero_queue_in(ctxt, req);
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}
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static void zero_queue_in(struct zero_context *ctxt, struct usb_request *req)
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{
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req->complete = zero_in_complete;
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req->context = ctxt;
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req->length = 4096;
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usb_ept_queue_xfer(ctxt->in, req);
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}
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static void zero_configure(int configured, void *_ctxt)
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{
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struct zero_context *ctxt = _ctxt;
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printk(KERN_INFO "zero_configure() %d\n", configured);
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if (configured) {
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zero_queue_in(ctxt, ctxt->req0);
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zero_queue_in(ctxt, ctxt->req1);
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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_zero = {
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.bind = zero_bind,
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.unbind = zero_unbind,
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.configure = zero_configure,
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.name = "zero",
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.context = &_context,
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.ifc_class = 0xff,
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.ifc_subclass = 0xfe,
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.ifc_protocol = 0x02,
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.ifc_name = "zero",
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.ifc_ept_count = 1,
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.ifc_ept_type = { EPT_BULK_IN },
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};
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static int __init zero_init(void)
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{
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printk(KERN_INFO "zero_init()\n");
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usb_function_register(&usb_func_zero);
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return 0;
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}
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module_init(zero_init);
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