302 lines
8.2 KiB
C
302 lines
8.2 KiB
C
/*
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* zero.c -- Gadget Zero, for USB development
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*
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* Copyright (C) 2003-2008 David Brownell
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* Copyright (C) 2008 by Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Gadget Zero only needs two bulk endpoints, and is an example of how you
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* can write a hardware-agnostic gadget driver running inside a USB device.
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* Some hardware details are visible, but don't affect most of the driver.
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*
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* Use it with the Linux host/master side "usbtest" driver to get a basic
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* functional test of your device-side usb stack, or with "usb-skeleton".
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*
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* It supports two similar configurations. One sinks whatever the usb host
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* writes, and in return sources zeroes. The other loops whatever the host
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* writes back, so the host can read it.
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*
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* Many drivers will only have one configuration, letting them be much
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* simpler if they also don't support high speed operation (like this
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* driver does).
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*
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* Why is *this* driver using two configurations, rather than setting up
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* two interfaces with different functions? To help verify that multiple
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* configuration infrastucture is working correctly; also, so that it can
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* work with low capability USB controllers without four bulk endpoints.
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*/
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/*
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* driver assumes self-powered hardware, and
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* has no way for users to trigger remote wakeup.
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*/
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/* #define VERBOSE_DEBUG */
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#include <linux/kernel.h>
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#include <linux/utsname.h>
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#include <linux/device.h>
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#include "g_zero.h"
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#include "gadget_chips.h"
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "composite.c"
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#include "usbstring.c"
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#include "config.c"
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#include "epautoconf.c"
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#include "f_sourcesink.c"
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#include "f_loopback.c"
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/*-------------------------------------------------------------------------*/
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#define DRIVER_VERSION "Cinco de Mayo 2008"
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static const char longname[] = "Gadget Zero";
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unsigned buflen = 4096;
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module_param(buflen, uint, 0);
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/*
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* Normally the "loopback" configuration is second (index 1) so
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* it's not the default. Here's where to change that order, to
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* work better with hosts where config changes are problematic or
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* controllers (like original superh) that only support one config.
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*/
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static int loopdefault = 0;
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module_param(loopdefault, bool, S_IRUGO|S_IWUSR);
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/*-------------------------------------------------------------------------*/
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/* Thanks to NetChip Technologies for donating this product ID.
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*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#ifndef CONFIG_USB_ZERO_HNPTEST
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#define DRIVER_VENDOR_NUM 0x0525 /* NetChip */
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#define DRIVER_PRODUCT_NUM 0xa4a0 /* Linux-USB "Gadget Zero" */
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#else
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#define DRIVER_VENDOR_NUM 0x1a0a /* OTG test device IDs */
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#define DRIVER_PRODUCT_NUM 0xbadd
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#endif
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/*-------------------------------------------------------------------------*/
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_VENDOR_SPEC,
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.idVendor = __constant_cpu_to_le16(DRIVER_VENDOR_NUM),
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.idProduct = __constant_cpu_to_le16(DRIVER_PRODUCT_NUM),
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.bNumConfigurations = 2,
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};
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#ifdef CONFIG_USB_OTG
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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#endif
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/* string IDs are assigned dynamically */
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#define STRING_MANUFACTURER_IDX 0
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#define STRING_PRODUCT_IDX 1
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#define STRING_SERIAL_IDX 2
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static char manufacturer[50];
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/* default serial number takes at least two packets */
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static char serial[] = "0123456789.0123456789.0123456789";
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static struct usb_string strings_dev[] = {
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[STRING_MANUFACTURER_IDX].s = manufacturer,
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[STRING_PRODUCT_IDX].s = longname,
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[STRING_SERIAL_IDX].s = serial,
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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struct usb_request *alloc_ep_req(struct usb_ep *ep)
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{
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struct usb_request *req;
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req = usb_ep_alloc_request(ep, GFP_ATOMIC);
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if (req) {
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req->length = buflen;
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req->buf = kmalloc(buflen, GFP_ATOMIC);
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if (!req->buf) {
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usb_ep_free_request(ep, req);
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req = NULL;
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}
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}
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return req;
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}
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void free_ep_req(struct usb_ep *ep, struct usb_request *req)
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{
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kfree(req->buf);
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usb_ep_free_request(ep, req);
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}
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static void disable_ep(struct usb_composite_dev *cdev, struct usb_ep *ep)
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{
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int value;
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if (ep->driver_data) {
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value = usb_ep_disable(ep);
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if (value < 0)
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DBG(cdev, "disable %s --> %d\n",
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ep->name, value);
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ep->driver_data = NULL;
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}
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}
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void disable_endpoints(struct usb_composite_dev *cdev,
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struct usb_ep *in, struct usb_ep *out)
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{
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disable_ep(cdev, in);
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disable_ep(cdev, out);
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}
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/*-------------------------------------------------------------------------*/
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static int __init zero_bind(struct usb_composite_dev *cdev)
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{
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int gcnum;
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struct usb_gadget *gadget = cdev->gadget;
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int id;
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/* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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id = usb_string_id(cdev);
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if (id < 0)
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return id;
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strings_dev[STRING_MANUFACTURER_IDX].id = id;
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device_desc.iManufacturer = id;
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id = usb_string_id(cdev);
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if (id < 0)
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return id;
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strings_dev[STRING_PRODUCT_IDX].id = id;
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device_desc.iProduct = id;
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id = usb_string_id(cdev);
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if (id < 0)
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return id;
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strings_dev[STRING_SERIAL_IDX].id = id;
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device_desc.iSerialNumber = id;
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/* Register primary, then secondary configuration. Note that
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* SH3 only allows one config...
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*/
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if (loopdefault) {
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loopback_add(cdev);
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if (!gadget_is_sh(gadget))
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sourcesink_add(cdev);
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} else {
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sourcesink_add(cdev);
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if (!gadget_is_sh(gadget))
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loopback_add(cdev);
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}
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gcnum = usb_gadget_controller_number(gadget);
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if (gcnum >= 0)
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device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
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else {
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/* gadget zero is so simple (for now, no altsettings) that
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* it SHOULD NOT have problems with bulk-capable hardware.
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* so just warn about unrcognized controllers -- don't panic.
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*
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* things like configuration and altsetting numbering
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* can need hardware-specific attention though.
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*/
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pr_warning("%s: controller '%s' not recognized\n",
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longname, gadget->name);
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device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
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}
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INFO(cdev, "%s, version: " DRIVER_VERSION "\n", longname);
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snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
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init_utsname()->sysname, init_utsname()->release,
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gadget->name);
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return 0;
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}
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static struct usb_composite_driver zero_driver = {
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.name = "zero",
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.dev = &device_desc,
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.strings = dev_strings,
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.bind = zero_bind,
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};
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MODULE_AUTHOR("David Brownell");
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MODULE_LICENSE("GPL");
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static int __init init(void)
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{
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return usb_composite_register(&zero_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&zero_driver);
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}
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module_exit(cleanup);
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