diff options
Diffstat (limited to 'drivers/usb/storage/usb.h')
| -rw-r--r-- | drivers/usb/storage/usb.h | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h new file mode 100644 index 00000000000..625b7aa9807 --- /dev/null +++ b/drivers/usb/storage/usb.h @@ -0,0 +1,204 @@ +/* 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/blkdev.h> +#include <linux/smp_lock.h> +#include <linux/completion.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 *); + unsigned int flags; +}; + +/* + * Static flag definitions. We use this roundabout technique so that the + * proc_info() routine can automatically display a message for each flag. + */ +#define US_DO_ALL_FLAGS \ + US_FLAG(SINGLE_LUN, 0x00000001) \ + /* allow access to only LUN 0 */ \ + US_FLAG(NEED_OVERRIDE, 0x00000002) \ + /* unusual_devs entry is necessary */ \ + US_FLAG(SCM_MULT_TARG, 0x00000004) \ + /* supports multiple targets */ \ + US_FLAG(FIX_INQUIRY, 0x00000008) \ + /* INQUIRY response needs faking */ \ + US_FLAG(FIX_CAPACITY, 0x00000010) \ + /* READ CAPACITY response too big */ \ + US_FLAG(IGNORE_RESIDUE, 0x00000020) \ + /* reported residue is wrong */ \ + US_FLAG(BULK32, 0x00000040) \ + /* Uses 32-byte CBW length */ \ + US_FLAG(NOT_LOCKABLE, 0x00000080) \ + /* PREVENT/ALLOW not supported */ \ + US_FLAG(GO_SLOW, 0x00000100) \ + /* Need delay after Command phase */ \ + US_FLAG(NO_WP_DETECT, 0x00000200) \ + /* Don't check for write-protect */ \ + +#define US_FLAG(name, value) US_FL_##name = value , +enum { US_DO_ALL_FLAGS }; +#undef US_FLAG + +/* 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 ABORTING_OR_DISCONNECTING ((1UL << US_FLIDX_ABORTING) | \ + (1UL << US_FLIDX_DISCONNECTING)) +#define US_FLIDX_RESETTING 22 /* 0x00400000 device reset in progress */ +#define US_FLIDX_TIMED_OUT 23 /* 0x00800000 SCSI midlayer timed out */ + + +#define USB_STOR_STRING_LEN 32 + +/* + * 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 */ + +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 */ + +/* 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 *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 */ + + /* thread information */ + int pid; /* control thread */ + + /* 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 cr_dma; /* buffer DMA addresses */ + dma_addr_t iobuf_dma; + + /* mutual exclusion and synchronization structures */ + struct semaphore sema; /* to sleep thread on */ + struct completion notify; /* thread begin/end */ + wait_queue_head_t delay_wait; /* wait during scan, reset */ + + /* subdriver information */ + void *extra; /* Any extra data */ + extra_data_destructor extra_destructor;/* extra data destructor */ +}; + +/* Convert between us_data and the corresponding Scsi_Host */ +static struct Scsi_Host inline *us_to_host(struct us_data *us) { + return container_of((void *) us, struct Scsi_Host, hostdata); +} +static struct us_data inline *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) + + +/* Vendor ID list for devices that require special handling */ +#define USB_VENDOR_ID_GENESYS 0x05e3 /* Genesys Logic */ + +#endif |