bbafa4668f
This patch is from Alan Stern (as560). It has been rediffed against a current tree. This patch allocates a separate buffer for usb-storage to use when auto-sensing. Up to now we have been using the sense buffer embedded in a scsi_cmnd struct, which is dangerous on hosts that (a) don't do cache-coherent DMA or (b) have DMA alignment restrictions. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
208 lines
7.3 KiB
C
208 lines
7.3 KiB
C
/* Driver for USB Mass Storage compliant devices
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* Main Header File
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*
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* $Id: usb.h,v 1.21 2002/04/21 02:57:59 mdharm Exp $
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*
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* Current development and maintenance by:
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* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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*
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* Initial work by:
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* (c) 1999 Michael Gee (michael@linuxspecific.com)
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*
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* This driver is based on the 'USB Mass Storage Class' document. This
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* describes in detail the protocol used to communicate with such
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* devices. Clearly, the designers had SCSI and ATAPI commands in
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* mind when they created this document. The commands are all very
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* similar to commands in the SCSI-II and ATAPI specifications.
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*
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* It is important to note that in a number of cases this class
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* exhibits class-specific exemptions from the USB specification.
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* Notably the usage of NAK, STALL and ACK differs from the norm, in
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* that they are used to communicate wait, failed and OK on commands.
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*
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* Also, for certain devices, the interrupt endpoint is used to convey
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* status of a command.
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*
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* Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
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* information about this driver.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _USB_H_
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#define _USB_H_
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#include <linux/usb.h>
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#include <linux/blkdev.h>
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#include <linux/smp_lock.h>
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#include <linux/completion.h>
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#include <scsi/scsi_host.h>
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struct us_data;
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struct scsi_cmnd;
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/*
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* Unusual device list definitions
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*/
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struct us_unusual_dev {
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const char* vendorName;
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const char* productName;
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__u8 useProtocol;
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__u8 useTransport;
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int (*initFunction)(struct us_data *);
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unsigned int flags;
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};
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/*
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* Static flag definitions. We use this roundabout technique so that the
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* proc_info() routine can automatically display a message for each flag.
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*/
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#define US_DO_ALL_FLAGS \
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US_FLAG(SINGLE_LUN, 0x00000001) \
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/* allow access to only LUN 0 */ \
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US_FLAG(NEED_OVERRIDE, 0x00000002) \
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/* unusual_devs entry is necessary */ \
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US_FLAG(SCM_MULT_TARG, 0x00000004) \
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/* supports multiple targets */ \
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US_FLAG(FIX_INQUIRY, 0x00000008) \
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/* INQUIRY response needs faking */ \
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US_FLAG(FIX_CAPACITY, 0x00000010) \
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/* READ CAPACITY response too big */ \
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US_FLAG(IGNORE_RESIDUE, 0x00000020) \
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/* reported residue is wrong */ \
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US_FLAG(BULK32, 0x00000040) \
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/* Uses 32-byte CBW length */ \
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US_FLAG(NOT_LOCKABLE, 0x00000080) \
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/* PREVENT/ALLOW not supported */ \
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US_FLAG(GO_SLOW, 0x00000100) \
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/* Need delay after Command phase */ \
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US_FLAG(NO_WP_DETECT, 0x00000200) \
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/* Don't check for write-protect */ \
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#define US_FLAG(name, value) US_FL_##name = value ,
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enum { US_DO_ALL_FLAGS };
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#undef US_FLAG
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/* Dynamic flag definitions: used in set_bit() etc. */
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#define US_FLIDX_URB_ACTIVE 18 /* 0x00040000 current_urb is in use */
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#define US_FLIDX_SG_ACTIVE 19 /* 0x00080000 current_sg is in use */
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#define US_FLIDX_ABORTING 20 /* 0x00100000 abort is in progress */
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#define US_FLIDX_DISCONNECTING 21 /* 0x00200000 disconnect in progress */
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#define ABORTING_OR_DISCONNECTING ((1UL << US_FLIDX_ABORTING) | \
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(1UL << US_FLIDX_DISCONNECTING))
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#define US_FLIDX_RESETTING 22 /* 0x00400000 device reset in progress */
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#define US_FLIDX_TIMED_OUT 23 /* 0x00800000 SCSI midlayer timed out */
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#define USB_STOR_STRING_LEN 32
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/*
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* We provide a DMA-mapped I/O buffer for use with small USB transfers.
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* It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
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* 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
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* size we'll allocate.
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*/
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#define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
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#define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
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typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
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typedef int (*trans_reset)(struct us_data*);
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typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
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typedef void (*extra_data_destructor)(void *); /* extra data destructor */
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/* we allocate one of these for every device that we remember */
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struct us_data {
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/* The device we're working with
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* It's important to note:
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* (o) you must hold dev_semaphore to change pusb_dev
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*/
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struct semaphore dev_semaphore; /* protect pusb_dev */
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struct usb_device *pusb_dev; /* this usb_device */
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struct usb_interface *pusb_intf; /* this interface */
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struct us_unusual_dev *unusual_dev; /* device-filter entry */
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unsigned long flags; /* from filter initially */
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unsigned int send_bulk_pipe; /* cached pipe values */
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unsigned int recv_bulk_pipe;
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unsigned int send_ctrl_pipe;
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unsigned int recv_ctrl_pipe;
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unsigned int recv_intr_pipe;
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/* information about the device */
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char *transport_name;
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char *protocol_name;
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__le32 bcs_signature;
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u8 subclass;
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u8 protocol;
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u8 max_lun;
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u8 ifnum; /* interface number */
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u8 ep_bInterval; /* interrupt interval */
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/* function pointers for this device */
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trans_cmnd transport; /* transport function */
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trans_reset transport_reset; /* transport device reset */
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proto_cmnd proto_handler; /* protocol handler */
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/* SCSI interfaces */
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struct scsi_cmnd *srb; /* current srb */
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unsigned int tag; /* current dCBWTag */
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/* thread information */
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int pid; /* control thread */
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/* control and bulk communications data */
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struct urb *current_urb; /* USB requests */
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struct usb_ctrlrequest *cr; /* control requests */
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struct usb_sg_request current_sg; /* scatter-gather req. */
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unsigned char *iobuf; /* I/O buffer */
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unsigned char *sensebuf; /* sense data buffer */
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dma_addr_t cr_dma; /* buffer DMA addresses */
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dma_addr_t iobuf_dma;
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/* mutual exclusion and synchronization structures */
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struct semaphore sema; /* to sleep thread on */
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struct completion notify; /* thread begin/end */
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wait_queue_head_t delay_wait; /* wait during scan, reset */
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/* subdriver information */
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void *extra; /* Any extra data */
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extra_data_destructor extra_destructor;/* extra data destructor */
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};
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/* Convert between us_data and the corresponding Scsi_Host */
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static struct Scsi_Host inline *us_to_host(struct us_data *us) {
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return container_of((void *) us, struct Scsi_Host, hostdata);
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}
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static struct us_data inline *host_to_us(struct Scsi_Host *host) {
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return (struct us_data *) host->hostdata;
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}
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/* Function to fill an inquiry response. See usb.c for details */
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extern void fill_inquiry_response(struct us_data *us,
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unsigned char *data, unsigned int data_len);
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/* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
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* single queue element srb for write access */
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#define scsi_unlock(host) spin_unlock_irq(host->host_lock)
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#define scsi_lock(host) spin_lock_irq(host->host_lock)
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/* Vendor ID list for devices that require special handling */
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#define USB_VENDOR_ID_GENESYS 0x05e3 /* Genesys Logic */
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#endif
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