ARM做为USB从设备的实现 include, linux, 网上

yuyang911220

ARM做为USB从设备的实现,在linux内核中有例程,很遗憾,不能直接拿过来用.

主要有两方面原因:
1,内核缺少一个头文件.
#include/linux/usb/g_hid.h
时间太久了,记得不太清楚.好像是这个文件.从网上down下来之后,扔到内核头文件里面即可.
里面的内容为:
[cpp] view plaincopy

• /*
• * g_hid.h -- Header file for USB HID gadget driver
• *
• * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
• *
• * This program is free software; you can redistribute it and/or modify
• * it under the terms of the GNU General Public License as published by
• * the Free Software Foundation; either version 2 of the License, or
• * (at your option) any later version.
• *
• * 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.
• *
• * You should have received a copy of the GNU General Public License
• * along with this program; if not, write to the Free Software
• * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
• */
  
• 
  
• #ifndef __LINUX_USB_G_HID_H
  
• #define __LINUX_USB_G_HID_H
  
• 
  
• struct hidg_func_descriptor {  
•         unsigned char           subclass;  
•         unsigned char           protocol;  
•         unsigned short          report_length;  
•         unsigned short          report_desc_length;  
•         unsigned char           report_desc[];  
• };  
• #endif /* __LINUX_USB_G_HID_H */
  

2, 在linux-2.6.31.1-cavm1/drivers/usb/gadget中,hid.c文件写法有误.
正确写法为:
[cpp] view plaincopy

• /*
• * hid.c -- HID Composite driver
• *
• * Based on multi.c
• *
• * Copyright (C) 2010 Fabien Chouteau <fabien.chouteau@barco.com>
• *
• * This program is free software; you can redistribute it and/or modify
• * it under the terms of the GNU General Public License as published by
• * the Free Software Foundation; either version 2 of the License, or
• * (at your option) any later version.
• *
• * 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.
• *
• * You should have received a copy of the GNU General Public License
• * along with this program; if not, write to the Free Software
• * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
• */
  
• 
  
• 
  
• #include <linux/kernel.h>
  
• #include <linux/platform_device.h>
  
• #include <linux/list.h>
  
• #include <linux/usb/musb.h>
  
• 
  
• 
  
• #define DRIVER_DESC     "HID ps3 controller"
  
• #define DRIVER_VERSION      "2011/07/21"
  
• 
  
• /*-------------------------------------------------------------------------*/
  
• 
  
• #define HIDG_VENDOR_NUM     0x0525  /* XXX NetChip */
  
• #define HIDG_PRODUCT_NUM    0xa4ac  /* Linux-USB HID gadget */
  
• 
  
• /*-------------------------------------------------------------------------*/
  
• 
  
• /*
• * kbuild is not very cooperative with respect to linking separately
• * compiled library objects into one module.  So for now we won't use
• * separate compilation ... ensuring init/exit sections work to shrink
• * the runtime footprint, and giving us at least some parts of what
• * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
• */
  
• 
  
• #include "composite.c"
  
• #include "usbstring.c"
  
• #include "config.c"
  
• #include "epautoconf.c"
  
• 
  
• #include "f_hid.c"
  
• 
  
• 
  
• struct hidg_func_node {  
•     struct list_head node;  
•     struct hidg_func_descriptor *func;  
• };  
• 
  
• static LIST_HEAD(hidg_func_list);  
• 
  
• /*-------------------------------------------------------------------------*/
  
• 
  
• static
  struct usb_device_descriptor device_desc = {  
•     .bLength =      sizeof device_desc,  
•     .bDescriptorType =  USB_DT_DEVICE,  
• 
  
•     .bcdUSB =       cpu_to_le16(0x0200),  
• 
  
•     /* .bDeviceClass =      USB_CLASS_COMM, */
  
•     /* .bDeviceSubClass =   0, */
  
•     /* .bDeviceProtocol =   0, */
  
•     .bDeviceClass =     0xEF,  
•     .bDeviceSubClass =  2,  
•     .bDeviceProtocol =  1,  
•     /* .bMaxPacketSize0 = f(hardware) */
  
• 
  
•     /* Vendor and product id can be overridden by module parameters.  */
  
•     .idVendor =     cpu_to_le16(HIDG_VENDOR_NUM),  
•     .idProduct =        cpu_to_le16(HIDG_PRODUCT_NUM),  
•     /* .bcdDevice = f(hardware) */
  
•     /* .iManufacturer = DYNAMIC */
  
•     /* .iProduct = DYNAMIC */
  
•     /* NO SERIAL NUMBER */
  
•     .bNumConfigurations =   1,  
• };  
• 
  
• static
  struct usb_otg_descriptor otg_descriptor = {  
•     .bLength =      sizeof otg_descriptor,  
•     .bDescriptorType =  USB_DT_OTG,  
• 
  
•     /* REVISIT SRP-only hardware is possible, although
•      * it would not be called "OTG" ...
•      */
  
•     .bmAttributes =     USB_OTG_SRP | USB_OTG_HNP,  
• };  
• 
  
• static
  const
  struct usb_descriptor_header *otg_desc[] = {  
•     (struct usb_descriptor_header *) &otg_descriptor,  
•     NULL,  
• };  
• 
  
• 
  
• /* string IDs are assigned dynamically */
  
• 
  
• #define STRING_MANUFACTURER_IDX     0
  
• #define STRING_PRODUCT_IDX      1
  
• 
  
• static
  char manufacturer[50];  
• 
  
• static
  struct usb_string strings_dev[] = {  
•     [STRING_MANUFACTURER_IDX].s = manufacturer,  
•     [STRING_PRODUCT_IDX].s = DRIVER_DESC,  
•     {  } /* end of list */
  
• };  
• 
  
• static
  struct usb_gadget_strings stringtab_dev = {  
•     .language   = 0x0409,   /* en-us */
  
•     .strings    = strings_dev,  
• };  
• 
  
• static
  struct usb_gadget_strings *dev_strings[] = {  
•     &stringtab_dev,  
•     NULL,  
• };