linux/drivers/usb/storage/usb.h
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   1/* Driver for USB Mass Storage compliant devices
   2 * Main Header File
   3 *
   4 * Current development and maintenance by:
   5 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   6 *
   7 * Initial work by:
   8 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
   9 *
  10 * This driver is based on the 'USB Mass Storage Class' document. This
  11 * describes in detail the protocol used to communicate with such
  12 * devices.  Clearly, the designers had SCSI and ATAPI commands in
  13 * mind when they created this document.  The commands are all very
  14 * similar to commands in the SCSI-II and ATAPI specifications.
  15 *
  16 * It is important to note that in a number of cases this class
  17 * exhibits class-specific exemptions from the USB specification.
  18 * Notably the usage of NAK, STALL and ACK differs from the norm, in
  19 * that they are used to communicate wait, failed and OK on commands.
  20 *
  21 * Also, for certain devices, the interrupt endpoint is used to convey
  22 * status of a command.
  23 *
  24 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
  25 * information about this driver.
  26 *
  27 * This program is free software; you can redistribute it and/or modify it
  28 * under the terms of the GNU General Public License as published by the
  29 * Free Software Foundation; either version 2, or (at your option) any
  30 * later version.
  31 *
  32 * This program is distributed in the hope that it will be useful, but
  33 * WITHOUT ANY WARRANTY; without even the implied warranty of
  34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  35 * General Public License for more details.
  36 *
  37 * You should have received a copy of the GNU General Public License along
  38 * with this program; if not, write to the Free Software Foundation, Inc.,
  39 * 675 Mass Ave, Cambridge, MA 02139, USA.
  40 */
  41
  42#ifndef _USB_H_
  43#define _USB_H_
  44
  45#include <linux/usb.h>
  46#include <linux/usb_usual.h>
  47#include <linux/blkdev.h>
  48#include <linux/completion.h>
  49#include <linux/mutex.h>
  50#include <scsi/scsi_host.h>
  51
  52struct us_data;
  53struct scsi_cmnd;
  54
  55/*
  56 * Unusual device list definitions 
  57 */
  58
  59struct us_unusual_dev {
  60        const char* vendorName;
  61        const char* productName;
  62        __u8  useProtocol;
  63        __u8  useTransport;
  64        int (*initFunction)(struct us_data *);
  65};
  66
  67
  68/* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
  69#define US_FLIDX_URB_ACTIVE     0       /* current_urb is in use    */
  70#define US_FLIDX_SG_ACTIVE      1       /* current_sg is in use     */
  71#define US_FLIDX_ABORTING       2       /* abort is in progress     */
  72#define US_FLIDX_DISCONNECTING  3       /* disconnect in progress   */
  73#define US_FLIDX_RESETTING      4       /* device reset in progress */
  74#define US_FLIDX_TIMED_OUT      5       /* SCSI midlayer timed out  */
  75#define US_FLIDX_DONT_SCAN      6       /* don't scan (disconnect)  */
  76
  77#define USB_STOR_STRING_LEN 32
  78
  79/*
  80 * We provide a DMA-mapped I/O buffer for use with small USB transfers.
  81 * It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
  82 * 31-byte buffer.  But Freecom needs a 64-byte buffer, so that's the
  83 * size we'll allocate.
  84 */
  85
  86#define US_IOBUF_SIZE           64      /* Size of the DMA-mapped I/O buffer */
  87#define US_SENSE_SIZE           18      /* Size of the autosense data buffer */
  88
  89typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
  90typedef int (*trans_reset)(struct us_data*);
  91typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
  92typedef void (*extra_data_destructor)(void *);  /* extra data destructor */
  93typedef void (*pm_hook)(struct us_data *, int); /* power management hook */
  94
  95#define US_SUSPEND      0
  96#define US_RESUME       1
  97
  98/* we allocate one of these for every device that we remember */
  99struct us_data {
 100        /* The device we're working with
 101         * It's important to note:
 102         *    (o) you must hold dev_mutex to change pusb_dev
 103         */
 104        struct mutex            dev_mutex;       /* protect pusb_dev */
 105        struct usb_device       *pusb_dev;       /* this usb_device */
 106        struct usb_interface    *pusb_intf;      /* this interface */
 107        struct us_unusual_dev   *unusual_dev;    /* device-filter entry     */
 108        unsigned long           fflags;          /* fixed flags from filter */
 109        unsigned long           dflags;          /* dynamic atomic bitflags */
 110        unsigned int            send_bulk_pipe;  /* cached pipe values */
 111        unsigned int            recv_bulk_pipe;
 112        unsigned int            send_ctrl_pipe;
 113        unsigned int            recv_ctrl_pipe;
 114        unsigned int            recv_intr_pipe;
 115
 116        /* information about the device */
 117        char                    *transport_name;
 118        char                    *protocol_name;
 119        __le32                  bcs_signature;
 120        u8                      subclass;
 121        u8                      protocol;
 122        u8                      max_lun;
 123
 124        u8                      ifnum;           /* interface number   */
 125        u8                      ep_bInterval;    /* interrupt interval */ 
 126
 127        /* function pointers for this device */
 128        trans_cmnd              transport;       /* transport function     */
 129        trans_reset             transport_reset; /* transport device reset */
 130        proto_cmnd              proto_handler;   /* protocol handler       */
 131
 132        /* SCSI interfaces */
 133        struct scsi_cmnd        *srb;            /* current srb         */
 134        unsigned int            tag;             /* current dCBWTag     */
 135
 136        /* control and bulk communications data */
 137        struct urb              *current_urb;    /* USB requests         */
 138        struct usb_ctrlrequest  *cr;             /* control requests     */
 139        struct usb_sg_request   current_sg;      /* scatter-gather req.  */
 140        unsigned char           *iobuf;          /* I/O buffer           */
 141        dma_addr_t              cr_dma;          /* buffer DMA addresses */
 142        dma_addr_t              iobuf_dma;
 143        struct task_struct      *ctl_thread;     /* the control thread   */
 144
 145        /* mutual exclusion and synchronization structures */
 146        struct completion       cmnd_ready;      /* to sleep thread on      */
 147        struct completion       notify;          /* thread begin/end        */
 148        wait_queue_head_t       delay_wait;      /* wait during scan, reset */
 149        struct completion       scanning_done;   /* wait for scan thread    */
 150
 151        /* subdriver information */
 152        void                    *extra;          /* Any extra data          */
 153        extra_data_destructor   extra_destructor;/* extra data destructor   */
 154#ifdef CONFIG_PM
 155        pm_hook                 suspend_resume_hook;
 156#endif
 157
 158        /* hacks for READ CAPACITY bug handling */
 159        int                     use_last_sector_hacks;
 160        int                     last_sector_retries;
 161};
 162
 163/* Convert between us_data and the corresponding Scsi_Host */
 164static inline struct Scsi_Host *us_to_host(struct us_data *us) {
 165        return container_of((void *) us, struct Scsi_Host, hostdata);
 166}
 167static inline struct us_data *host_to_us(struct Scsi_Host *host) {
 168        return (struct us_data *) host->hostdata;
 169}
 170
 171/* Function to fill an inquiry response. See usb.c for details */
 172extern void fill_inquiry_response(struct us_data *us,
 173        unsigned char *data, unsigned int data_len);
 174
 175/* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
 176 * single queue element srb for write access */
 177#define scsi_unlock(host)       spin_unlock_irq(host->host_lock)
 178#define scsi_lock(host)         spin_lock_irq(host->host_lock)
 179
 180/* General routines provided by the usb-storage standard core */
 181#ifdef CONFIG_PM
 182extern int usb_stor_suspend(struct usb_interface *iface, pm_message_t message);
 183extern int usb_stor_resume(struct usb_interface *iface);
 184extern int usb_stor_reset_resume(struct usb_interface *iface);
 185#else
 186#define usb_stor_suspend        NULL
 187#define usb_stor_resume         NULL
 188#define usb_stor_reset_resume   NULL
 189#endif
 190
 191extern int usb_stor_pre_reset(struct usb_interface *iface);
 192extern int usb_stor_post_reset(struct usb_interface *iface);
 193
 194extern int usb_stor_probe1(struct us_data **pus,
 195                struct usb_interface *intf,
 196                const struct usb_device_id *id,
 197                struct us_unusual_dev *unusual_dev);
 198extern int usb_stor_probe2(struct us_data *us);
 199extern void usb_stor_disconnect(struct usb_interface *intf);
 200
 201#endif
 202
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