drivers/usb/storage/usb.h

   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
  52 struct us_data;
  53 struct scsi_cmnd;
  54
  55 /*
  56  * Unusual device list definitions
  57  */
  58
  59 struct 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
  89 typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
  90 typedef int (*trans_reset)(struct us_data*);
  91 typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
  92 typedef void (*extra_data_destructor)(void *);  /* extra data destructor */
  93 typedef 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 */
  99 struct 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 */
 164 static inline struct Scsi_Host *us_to_host(struct us_data *us) {
 165         return container_of((void *) us, struct Scsi_Host, hostdata);
 166 }
 167 static 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 */
 172 extern 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
 182 extern int usb_stor_suspend(struct usb_interface *iface, pm_message_t message);
 183 extern int usb_stor_resume(struct usb_interface *iface);
 184 extern 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
 191 extern int usb_stor_pre_reset(struct usb_interface *iface);
 192 extern int usb_stor_post_reset(struct usb_interface *iface);
 193
 194 extern 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);
 198 extern int usb_stor_probe2(struct us_data *us);
 199 extern void usb_stor_disconnect(struct usb_interface *intf);
 200
 201 #endif