/* Driver for USB Mass Storage compliant devices * Main Header File * * $Id: usb.h,v 1.21 2002/04/21 02:57:59 mdharm Exp $ * * Current development and maintenance by: * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) * * Initial work by: * (c) 1999 Michael Gee (michael@linuxspecific.com) * * This driver is based on the 'USB Mass Storage Class' document. This * describes in detail the protocol used to communicate with such * devices. Clearly, the designers had SCSI and ATAPI commands in * mind when they created this document. The commands are all very * similar to commands in the SCSI-II and ATAPI specifications. * * It is important to note that in a number of cases this class * exhibits class-specific exemptions from the USB specification. * Notably the usage of NAK, STALL and ACK differs from the norm, in * that they are used to communicate wait, failed and OK on commands. * * Also, for certain devices, the interrupt endpoint is used to convey * status of a command. * * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more * information about this driver. * * 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, 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., * 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef _USB_H_ #define _USB_H_ #include <linux/usb.h> #include <linux/blk.h> #include <linux/smp_lock.h> #include <linux/completion.h> #include <linux/version.h> #include "scsi.h" #include "hosts.h" struct us_data; /* * Unusual device list definitions */ struct us_unusual_dev { const char* vendorName; const char* productName; __u8 useProtocol; __u8 useTransport; int (*initFunction)(struct us_data *); unsigned int flags; }; /* Flag definitions: these entries are static */ #define US_FL_SINGLE_LUN 0x00000001 /* allow access to only LUN 0 */ #define US_FL_MODE_XLATE 0x00000002 /* translate _6 to _10 commands for Win/MacOS compatibility */ #define US_FL_SCM_MULT_TARG 0x00000020 /* supports multiple targets */ #define US_FL_FIX_INQUIRY 0x00000040 /* INQUIRY response needs fixing */ #define US_FL_FIX_CAPACITY 0x00000080 /* READ CAPACITY response too big */ /* Dynamic flag definitions: used in set_bit() etc. */ #define US_FLIDX_URB_ACTIVE 18 /* 0x00040000 current_urb is in use */ #define US_FLIDX_SG_ACTIVE 19 /* 0x00080000 current_sg is in use */ #define US_FLIDX_ABORTING 20 /* 0x00100000 abort is in progress */ #define US_FLIDX_DISCONNECTING 21 /* 0x00200000 disconnect in progress */ #define DONT_SUBMIT ((1UL << US_FLIDX_ABORTING) | \ (1UL << US_FLIDX_DISCONNECTING)) /* processing state machine states */ #define US_STATE_IDLE 1 #define US_STATE_RUNNING 2 #define US_STATE_RESETTING 3 #define US_STATE_ABORTING 4 #define USB_STOR_STRING_LEN 32 #define US_IOBUF_SIZE 32 /* Big enough for bulk-only CBW */ typedef int (*trans_cmnd)(Scsi_Cmnd*, struct us_data*); typedef int (*trans_reset)(struct us_data*); typedef void (*proto_cmnd)(Scsi_Cmnd*, struct us_data*); typedef void (*extra_data_destructor)(void *); /* extra data destructor */ /* we allocate one of these for every device that we remember */ struct us_data { /* The device we're working with * It's important to note: * (o) you must hold dev_semaphore to change pusb_dev */ struct semaphore dev_semaphore; /* protect pusb_dev */ struct usb_device *pusb_dev; /* this usb_device */ struct usb_interface *pusb_intf; /* this interface */ struct us_unusual_dev *unusual_dev; /* device-filter entry */ unsigned long flags; /* from filter initially */ unsigned int send_bulk_pipe; /* cached pipe values */ unsigned int recv_bulk_pipe; unsigned int send_ctrl_pipe; unsigned int recv_ctrl_pipe; unsigned int recv_intr_pipe; /* information about the device */ char vendor[USB_STOR_STRING_LEN]; char product[USB_STOR_STRING_LEN]; char serial[USB_STOR_STRING_LEN]; char *transport_name; char *protocol_name; u8 subclass; u8 protocol; u8 max_lun; u8 ifnum; /* interface number */ u8 ep_bInterval; /* interrupt interval */ /* function pointers for this device */ trans_cmnd transport; /* transport function */ trans_reset transport_reset; /* transport device reset */ proto_cmnd proto_handler; /* protocol handler */ /* SCSI interfaces */ struct Scsi_Host *host; /* our dummy host data */ Scsi_Cmnd *srb; /* current srb */ /* thread information */ int pid; /* control thread */ int sm_state; /* what we are doing */ /* control and bulk communications data */ struct urb *current_urb; /* USB requests */ struct usb_ctrlrequest *cr; /* control requests */ struct usb_sg_request current_sg; /* scatter-gather req. */ unsigned char *iobuf; /* I/O buffer */ /* mutual exclusion structures */ struct semaphore sema; /* to sleep thread on */ struct completion notify; /* thread begin/end */ /* subdriver information */ void *extra; /* Any extra data */ extra_data_destructor extra_destructor;/* extra data destructor */ }; /* The structure which defines our driver */ extern struct usb_driver usb_storage_driver; /* Function to fill an inquiry response. See usb.c for details */ extern void fill_inquiry_response(struct us_data *us, unsigned char *data, unsigned int data_len); /* The scsi_lock() and scsi_unlock() macros protect the sm_state and the * single queue element srb for write access */ #define scsi_unlock(host) spin_unlock_irq(host->host_lock) #define scsi_lock(host) spin_lock_irq(host->host_lock) #define sg_address(psg) (page_address((psg).page) + (psg).offset) #endif