211 lines
7.0 KiB
C
211 lines
7.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Driver for USB Mass Storage compliant devices
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* Main Header File
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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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#ifndef _USB_H_
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#define _USB_H_
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#include <linux/usb.h>
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#include <linux/usb_usual.h>
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#include <linux/blkdev.h>
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#include <linux/completion.h>
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#include <linux/mutex.h>
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#include <linux/workqueue.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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};
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/* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
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#define US_FLIDX_URB_ACTIVE 0 /* current_urb is in use */
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#define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
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#define US_FLIDX_ABORTING 2 /* abort is in progress */
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#define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
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#define US_FLIDX_RESETTING 4 /* device reset in progress */
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#define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
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#define US_FLIDX_SCAN_PENDING 6 /* scanning not yet done */
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#define US_FLIDX_REDO_READ10 7 /* redo READ(10) command */
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#define US_FLIDX_READ10_WORKED 8 /* previous READ(10) succeeded */
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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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typedef void (*pm_hook)(struct us_data *, int); /* power management hook */
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#define US_SUSPEND 0
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#define US_RESUME 1
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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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/*
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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_mutex to change pusb_dev
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*/
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struct mutex dev_mutex; /* 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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const struct us_unusual_dev *unusual_dev;
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/* device-filter entry */
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unsigned long fflags; /* fixed flags from filter */
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unsigned long dflags; /* dynamic atomic bitflags */
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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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char scsi_name[32]; /* scsi_host name */
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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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dma_addr_t iobuf_dma; /* buffer DMA addresses */
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struct task_struct *ctl_thread; /* the control thread */
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/* mutual exclusion and synchronization structures */
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struct completion cmnd_ready; /* 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 reset */
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struct delayed_work scan_dwork; /* for async scanning */
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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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#ifdef CONFIG_PM
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pm_hook suspend_resume_hook;
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#endif
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/* hacks for READ CAPACITY bug handling */
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int use_last_sector_hacks;
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int last_sector_retries;
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};
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/* Convert between us_data and the corresponding Scsi_Host */
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static inline struct Scsi_Host *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 inline struct us_data *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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/*
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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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*/
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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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/* General routines provided by the usb-storage standard core */
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#ifdef CONFIG_PM
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extern int usb_stor_suspend(struct usb_interface *iface, pm_message_t message);
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extern int usb_stor_resume(struct usb_interface *iface);
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extern int usb_stor_reset_resume(struct usb_interface *iface);
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#else
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#define usb_stor_suspend NULL
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#define usb_stor_resume NULL
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#define usb_stor_reset_resume NULL
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#endif
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extern int usb_stor_pre_reset(struct usb_interface *iface);
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extern int usb_stor_post_reset(struct usb_interface *iface);
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extern int usb_stor_probe1(struct us_data **pus,
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struct usb_interface *intf,
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const struct usb_device_id *id,
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const struct us_unusual_dev *unusual_dev,
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struct scsi_host_template *sht);
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extern int usb_stor_probe2(struct us_data *us);
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extern void usb_stor_disconnect(struct usb_interface *intf);
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extern void usb_stor_adjust_quirks(struct usb_device *dev,
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unsigned long *fflags);
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#define module_usb_stor_driver(__driver, __sht, __name) \
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static int __init __driver##_init(void) \
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{ \
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usb_stor_host_template_init(&(__sht), __name, THIS_MODULE); \
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return usb_register(&(__driver)); \
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} \
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module_init(__driver##_init); \
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static void __exit __driver##_exit(void) \
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{ \
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usb_deregister(&(__driver)); \
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} \
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module_exit(__driver##_exit)
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#endif
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