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* Driver for USB Mass Storage compliant devices
* Main Header File
* Current development and maintenance by:
* (c) 1999-2002 Matthew Dharm (
* Initial work by:
* (c) 1999 Michael Gee (
* 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 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
* 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/usb_usual.h>
#include <linux/blkdev.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/workqueue.h>
#include <scsi/scsi_host.h>
struct us_data;
struct scsi_cmnd;
* Unusual device list definitions
struct us_unusual_dev {
const char* vendorName;
const char* productName;
__u8 useProtocol;
__u8 useTransport;
int (*initFunction)(struct us_data *);
/* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
#define US_FLIDX_URB_ACTIVE 0 /* current_urb is in use */
#define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
#define US_FLIDX_ABORTING 2 /* abort is in progress */
#define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
#define US_FLIDX_RESETTING 4 /* device reset in progress */
#define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
#define US_FLIDX_SCAN_PENDING 6 /* scanning not yet done */
#define US_FLIDX_REDO_READ10 7 /* redo READ(10) command */
#define US_FLIDX_READ10_WORKED 8 /* previous READ(10) succeeded */
* We provide a DMA-mapped I/O buffer for use with small USB transfers.
* It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
* 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
* size we'll allocate.
#define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
#define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
typedef int (*trans_reset)(struct us_data*);
typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
typedef void (*extra_data_destructor)(void *); /* extra data destructor */
typedef void (*pm_hook)(struct us_data *, int); /* power management hook */
#define US_SUSPEND 0
#define US_RESUME 1
/* 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_mutex to change pusb_dev
struct mutex dev_mutex; /* 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 fflags; /* fixed flags from filter */
unsigned long dflags; /* dynamic atomic bitflags */
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 *transport_name;
char *protocol_name;
__le32 bcs_signature;
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_cmnd *srb; /* current srb */
unsigned int tag; /* current dCBWTag */
char scsi_name[32]; /* scsi_host name */
/* 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 */
dma_addr_t iobuf_dma; /* buffer DMA addresses */
struct task_struct *ctl_thread; /* the control thread */
/* mutual exclusion and synchronization structures */
struct completion cmnd_ready; /* to sleep thread on */
struct completion notify; /* thread begin/end */
wait_queue_head_t delay_wait; /* wait during reset */
struct delayed_work scan_dwork; /* for async scanning */
/* subdriver information */
void *extra; /* Any extra data */
extra_data_destructor extra_destructor;/* extra data destructor */
#ifdef CONFIG_PM
pm_hook suspend_resume_hook;
/* hacks for READ CAPACITY bug handling */
int use_last_sector_hacks;
int last_sector_retries;
/* Convert between us_data and the corresponding Scsi_Host */
static inline struct Scsi_Host *us_to_host(struct us_data *us) {
return container_of((void *) us, struct Scsi_Host, hostdata);
static inline struct us_data *host_to_us(struct Scsi_Host *host) {
return (struct us_data *) host->hostdata;
/* 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)
/* General routines provided by the usb-storage standard core */
#ifdef CONFIG_PM
extern int usb_stor_suspend(struct usb_interface *iface, pm_message_t message);
extern int usb_stor_resume(struct usb_interface *iface);
extern int usb_stor_reset_resume(struct usb_interface *iface);
#define usb_stor_suspend NULL
#define usb_stor_resume NULL
#define usb_stor_reset_resume NULL
extern int usb_stor_pre_reset(struct usb_interface *iface);
extern int usb_stor_post_reset(struct usb_interface *iface);
extern int usb_stor_probe1(struct us_data **pus,
struct usb_interface *intf,
const struct usb_device_id *id,
struct us_unusual_dev *unusual_dev,
struct scsi_host_template *sht);
extern int usb_stor_probe2(struct us_data *us);
extern void usb_stor_disconnect(struct usb_interface *intf);
extern void usb_stor_adjust_quirks(struct usb_device *dev,
unsigned long *fflags);
#define module_usb_stor_driver(__driver, __sht, __name) \
static int __init __driver##_init(void) \
{ \
usb_stor_host_template_init(&(__sht), __name, THIS_MODULE); \
return usb_register(&(__driver)); \
} \
module_init(__driver##_init); \
static void __exit __driver##_exit(void) \
{ \
usb_deregister(&(__driver)); \
} \