usb.h

看到最近大家都关心 usbhost 的实现, 论坛上能找到的代码仅是一些简单的 demo , 完整的源码级的协议层是找不到的 我就贡献一把, 将我前一段时间移植成功的 USBHost 代码奉上 注

/*
 * (C) Copyright 2001
 * Denis Peter, MPL AG Switzerland
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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
 *
 * Note: Part of this code has been derived from linux
 *
 */
#ifndef _USB_H_
#define _USB_H_
#include "usb_defs.h"

struct cmd_tbl_s 
{
    char   *name;    /* Command Name      */
    int    maxargs;  /* maximum number of arguments  */
    int    repeatable;  /* autorepeat allowed?    */
    /* Implementation function  */
    int    (*cmd)(struct cmd_tbl_s *, int, int, char *[]);
    char   *usage;    /* Usage message  (short)  */
    char   *help;    /* Help  message  (long)  */
    /* do auto completion on the arguments */
    int    (*complete)(int argc, char *argv[], char last_char, int maxv, char *cmdv[]);
};


typedef struct cmd_tbl_s  cmd_tbl_t;
/* Interface types: */
#define IF_TYPE_UNKNOWN     0
#define IF_TYPE_IDE         1
#define IF_TYPE_SCSI        2
#define IF_TYPE_ATAPI       3
#define IF_TYPE_USB         4
#define IF_TYPE_DOC         5
#define IF_TYPE_MMC         6
/* Part types */
#define PART_TYPE_UNKNOWN     0x00
#define PART_TYPE_MAC         0x01
#define PART_TYPE_DOS         0x02
#define PART_TYPE_ISO         0x03
#define PART_TYPE_AMIGA       0x04
/* device types */
#define DEV_TYPE_UNKNOWN      0xff  /* not connected */
#define DEV_TYPE_HARDDISK     0x00  /* harddisk */
#define DEV_TYPE_TAPE         0x01  /* Tape */
#define DEV_TYPE_CDROM        0x05  /* CD-ROM */
#define DEV_TYPE_OPDISK       0x07  /* optical disk */

/* Everything is aribtrary */
#define USB_ALTSETTINGALLOC   4
#define USB_MAXALTSETTING     128  /* Hard limit */
#define USB_MAX_DEVICE        4
#define USB_MAXCONFIG         4
#define USB_MAXINTERFACES     4
#define USB_MAXENDPOINTS      4
#define USB_MAXCHILDREN       4  /* This is arbitrary */
#define USB_MAX_HUB           2
#define USB_CNTL_TIMEOUT      100 /* 100ms timeout */

/* String descriptor */
__packed struct usb_string_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned short wData[1];
};

/* device request (setup) */
__packed struct devrequest 
{
    unsigned char requesttype;
    unsigned char request;
    unsigned short value;
    unsigned short index;
    unsigned short length;
};

/* All standard descriptors have these 2 fields in common */
__packed struct usb_descriptor_header 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
};

/* Device descriptor */
__packed struct usb_device_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned short bcdUSB;
    unsigned char  bDeviceClass;
    unsigned char  bDeviceSubClass;
    unsigned char  bDeviceProtocol;
    unsigned char  bMaxPacketSize0;
    unsigned short idVendor;
    unsigned short idProduct;
    unsigned short bcdDevice;
    unsigned char  iManufacturer;
    unsigned char  iProduct;
    unsigned char  iSerialNumber;
    unsigned char  bNumConfigurations;
} ;

/* Endpoint descriptor */
__packed struct usb_endpoint_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned char  bEndpointAddress;
    unsigned char  bmAttributes;
    unsigned short wMaxPacketSize;
    unsigned char  bInterval;
    unsigned char  bRefresh;
    unsigned char  bSynchAddress;
} ;

/* Interface descriptor */
__packed struct usb_interface_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned char  bInterfaceNumber;
    unsigned char  bAlternateSetting;
    unsigned char  bNumEndpoints;
    unsigned char  bInterfaceClass;
    unsigned char  bInterfaceSubClass;
    unsigned char  bInterfaceProtocol;
    unsigned char  iInterface;
    unsigned char  no_of_ep;
    unsigned char  num_altsetting;
    unsigned char  act_altsetting;
    struct usb_endpoint_descriptor ep_desc[USB_MAXENDPOINTS];
} ;

/* Configuration descriptor information.. */
__packed struct usb_config_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned short wTotalLength;
    unsigned char  bNumInterfaces;
    unsigned char  bConfigurationValue;
    unsigned char  iConfiguration;
    unsigned char  bmAttributes;
    unsigned char  MaxPower;
    unsigned char  no_of_if;    /* number of interfaces */
    struct usb_interface_descriptor if_desc[USB_MAXINTERFACES];
} ;

struct usb_device 
{
    int devnum;               /* Device number on USB bus */
    int slow;                 /* Slow device? */
    char mf[32];              /* manufacturer */
    char prod[32];            /* product */
    char serial[32];          /* serial number */
    int maxpacketsize;        /* Maximum packet size; encoded as 0,1,2,3 = 8,16,32,64 */
    unsigned int toggle[2];   /* one bit for each endpoint ([0] = IN, [1] = OUT) */
    unsigned int halted[2];   /* endpoint halts; one bit per endpoint # & direction; */
    /* [0] = IN, [1] = OUT */
    int epmaxpacketin[16];    /* INput endpoint specific maximums */
    int epmaxpacketout[16];   /* OUTput endpoint specific maximums */
    int configno;             /* selected config number */
    struct usb_device_descriptor descriptor; /* Device Descriptor */
    struct usb_config_descriptor config; /* config descriptor */
    int have_langid;          /* whether string_langid is valid yet */
    int string_langid;        /* language ID for strings */
    int (*irq_handle)(struct usb_device *dev);
    unsigned long irq_status;
    int irq_act_len;          /* transfered bytes */
    void *privptr;
    /*
       * Child devices -  if this is a hub device
       * Each instance needs its own set of data structures.
       */
    unsigned long status;
    int act_len;              /* transfered bytes */
    int maxchild;             /* Number of ports if hub */
    struct usb_device *parent;
    struct usb_device *children[USB_MAXCHILDREN];
};


/**********************************************************************
 * this is how the lowlevel part communicate with the outer world
 */
//#if defined(CONFIG_USB_UHCI) || defined(CONFIG_USB_OHCI) || defined (CONFIG_USB_SL811HS)
int usb_lowlevel_init(void);
int usb_lowlevel_stop(void);
int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,int transfer_len);
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
int transfer_len,struct devrequest *setup);
int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
int transfer_len, int interval);
/* Defines */
#define USB_UHCI_VEND_ID 0x8086
#define USB_UHCI_DEV_ID   0x7112
//#else
//#error USB Lowlevel not defined
//#endif
#define USB_MAX_STOR_DEV  2

typedef struct block_dev_desc 
{
    int           if_type;        /* type of the interface */
    int          dev;             /* device number */
    unsigned char  part_type;     /* partition type */
    unsigned char  target;        /* target SCSI ID */
    unsigned char  lun;           /* target LUN */
    unsigned char  type;          /* device type */
    unsigned char  removable;     /* removable device */
    unsigned long  lba;           /* number of blocks */
    unsigned long  blksz;         /* block size */
    unsigned char  vendor [40+1]; /* IDE model, SCSI Vendor */
    unsigned char  product[20+1]; /* IDE Serial no, SCSI product */
    unsigned char  revision[8+1]; /* firmware revision */
    unsigned long  (*block_read)(int dev,
        unsigned long start,
        unsigned long blkcnt,
        void  *buffer);

    unsigned long  (*block_write)(int dev,
        unsigned long start,
        unsigned long blkcnt,
        void  *buffer);
}block_dev_desc_t;

block_dev_desc_t *usb_stor_get_dev(int index);
int usb_stor_scan( void );
void usb_stor_info(void);
/* routines */
int usb_init(void); /* initialize the USB Controller */
int usb_stop(void); /* stop the USB Controller */
int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);
int usb_set_idle(struct usb_device *dev, int ifnum, int duration, int report_id);
struct usb_device * usb_get_dev_index(int index);
int usb_control_msg(struct usb_device *dev, unsigned int pipe,
unsigned char request, unsigned char requesttype,
unsigned short value, unsigned short index,
void *data, unsigned short size, int timeout);
int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
void *data, int len, int *actual_length, int timeout);
int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,
void *buffer,int transfer_len, int interval);
void usb_disable_asynch(int disable);
int usb_maxpacket(struct usb_device *dev,unsigned long pipe);
void wait_ms(unsigned long ms);
int usb_get_configuration_no(struct usb_device *dev,unsigned char *buffer,int cfgno);
int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type, unsigned char id, void *buf, int size);
int usb_get_class_descriptor(struct usb_device *dev, int ifnum,
unsigned char type, unsigned char id, void *buf, int size);
int usb_clear_halt(struct usb_device *dev, int pipe);
int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
int usb_set_interface(struct usb_device *dev, int interface, int alternate);
/* big endian -> little endian conversion */
/* some CPUs are already little endian e.g. the ARM920T */
#define swap_16(x) ((unsigned short)(x))
#define swap_32(x) ((unsigned long)(x))
/*
 * Calling this entity a "pipe" is glorifying it. A USB pipe
 * is something embarrassingly simple: it basically consists
 * of the following information:
 *  - device number (7 bits)
 *  - endpoint number (4 bits)
 *  - current Data0/1 state (1 bit)
 *  - direction (1 bit)
 *  - speed (1 bit)
 *  - max packet size (2 bits: 8, 16, 32 or 64)
 *  - pipe type (2 bits: control, interrupt, bulk, isochronous)
 *
 * That's 18 bits. Really. Nothing more. And the USB people have
 * documented these eighteen bits as some kind of glorious
 * virtual data structure.
 *
 * Let's not fall in that trap. We'll just encode it as a simple
 * unsigned int. The encoding is:
 *
 *  - max size:    bits 0-1  (00 = 8, 01 = 16, 10 = 32, 11 = 64)
 *  - direction:  bit 7    (0 = Host-to-Device [Out], 1 = Device-to-Host [In])
 *  - device:    bits 8-14
 *  - endpoint:    bits 15-18
 *  - Data0/1:    bit 19
 *  - speed:    bit 26    (0 = Full, 1 = Low Speed)
 *  - pipe type:  bits 30-31  (00 = isochronous, 01 = interrupt, 10 = control, 11 = bulk)
 *
 * Why? Because it's arbitrary, and whatever encoding we select is really
 * up to us. This one happens to share a lot of bit positions with the UHCI
 * specification, so that much of the uhci driver can just mask the bits
 * appropriately.
 */
/* Create various pipes... */
#define create_pipe(dev,endpoint) \
(((dev)->devnum << 8) | (endpoint << 15) | ((dev)->slow << 26) | (dev)->maxpacketsize)
#define default_pipe(dev) ((dev)->slow <<26)
#define usb_sndctrlpipe(dev,endpoint)  ((PIPE_CONTROL << 30) | create_pipe(dev,endpoint))
#define usb_rcvctrlpipe(dev,endpoint)  ((PIPE_CONTROL << 30) | create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndisocpipe(dev,endpoint)  ((PIPE_ISOCHRONOUS << 30) | create_pipe(dev,endpoint))
#define usb_rcvisocpipe(dev,endpoint)  ((PIPE_ISOCHRONOUS << 30) | create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndbulkpipe(dev,endpoint)  ((PIPE_BULK << 30) | create_pipe(dev,endpoint))
#define usb_rcvbulkpipe(dev,endpoint)  ((PIPE_BULK << 30) | create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_sndintpipe(dev,endpoint)  ((PIPE_INTERRUPT << 30) | create_pipe(dev,endpoint))
#define usb_rcvintpipe(dev,endpoint)  ((PIPE_INTERRUPT << 30) | create_pipe(dev,endpoint) | USB_DIR_IN)
#define usb_snddefctrl(dev)    ((PIPE_CONTROL << 30) | default_pipe(dev))
#define usb_rcvdefctrl(dev)    ((PIPE_CONTROL << 30) | default_pipe(dev) | USB_DIR_IN)
/* The D0/D1 toggle bits */
#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> ep) & 1)
#define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << ep))
#define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << ep)) | ((bit) << ep))
/* Endpoint halt control/status */
#define usb_endpoint_out(ep_dir)  (((ep_dir >> 7) & 1) ^ 1)
#define usb_endpoint_halt(dev, ep, out) ((dev)->halted[out] |= (1 << (ep)))
#define usb_endpoint_running(dev, ep, out) ((dev)->halted[out] &= ~(1 << (ep)))
#define usb_endpoint_halted(dev, ep, out) ((dev)->halted[out] & (1 << (ep)))
#define usb_packetid(pipe)  (((pipe) & USB_DIR_IN) ? USB_PID_IN : USB_PID_OUT)
#define usb_pipeout(pipe)  ((((pipe) >> 7) & 1) ^ 1)
#define usb_pipein(pipe)  (((pipe) >> 7) & 1)
#define usb_pipedevice(pipe)  (((pipe) >> 8) & 0x7f)
#define usb_pipe_endpdev(pipe)  (((pipe) >> 8) & 0x7ff)
#define usb_pipeendpoint(pipe)  (((pipe) >> 15) & 0xf)
#define usb_pipedata(pipe)  (((pipe) >> 19) & 1)
#define usb_pipeslow(pipe)  (((pipe) >> 26) & 1)
#define usb_pipetype(pipe)  (((pipe) >> 30) & 3)
#define usb_pipeisoc(pipe)  (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
#define usb_pipeint(pipe)  (usb_pipetype((pipe)) == PIPE_INTERRUPT)
#define usb_pipecontrol(pipe)  (usb_pipetype((pipe)) == PIPE_CONTROL)
#define usb_pipebulk(pipe)  (usb_pipetype((pipe)) == PIPE_BULK)

#define s_UartPrint(fmt,args...)
/*************************************************************************
 * Hub Stuff
 */
__packed struct usb_port_status 
{
    unsigned short wPortStatus;
    unsigned short wPortChange;
} ;


/* Hub descriptor */
__packed struct usb_hub_descriptor 
{
    unsigned char  bLength;
    unsigned char  bDescriptorType;
    unsigned char  bNbrPorts;
    unsigned short wHubCharacteristics;
    unsigned char  bPwrOn2PwrGood;
    unsigned char  bHubContrCurrent;
    unsigned char  DeviceRemovable[(USB_MAXCHILDREN+1+7)/8];
    unsigned char  PortPowerCtrlMask[(USB_MAXCHILDREN+1+7)/8];
    /* DeviceRemovable and PortPwrCtrlMask want to be variable-length
         bitmaps that hold max 255 entries. (bit0 is ignored) */
} ;

struct usb_hub_device 
{
    struct usb_device *pusb_dev;
    struct usb_hub_descriptor desc;
};

struct usb_device * usb_device_find(int devnum);
#endif /*_USB_H_ */