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Diffstat (limited to 'drivers/usb/storage/usb.h')
| -rw-r--r-- | drivers/usb/storage/usb.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/usb/storage/usb.h b/drivers/usb/storage/usb.h new file mode 100644 index 000000000..307e339a9 --- /dev/null +++ b/drivers/usb/storage/usb.h @@ -0,0 +1,207 @@ +/* Driver for USB Mass Storage compliant devices + * Main Header File + * + * 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/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 */ + +#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 */ +#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; +#endif + + /* 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); +#else +#define usb_stor_suspend NULL +#define usb_stor_resume NULL +#define usb_stor_reset_resume NULL +#endif + +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); +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); + +#endif |