1 /* Driver for USB Mass Storage compliant devices
4 * Current development and maintenance by:
5 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
8 * (c) 1999 Michael Gee (michael@linuxspecific.com)
10 * This driver is based on the 'USB Mass Storage Class' document. This
11 * describes in detail the protocol used to communicate with such
12 * devices. Clearly, the designers had SCSI and ATAPI commands in
13 * mind when they created this document. The commands are all very
14 * similar to commands in the SCSI-II and ATAPI specifications.
16 * It is important to note that in a number of cases this class
17 * exhibits class-specific exemptions from the USB specification.
18 * Notably the usage of NAK, STALL and ACK differs from the norm, in
19 * that they are used to communicate wait, failed and OK on commands.
21 * Also, for certain devices, the interrupt endpoint is used to convey
22 * status of a command.
24 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
25 * information about this driver.
27 * This program is free software; you can redistribute it and/or modify it
28 * under the terms of the GNU General Public License as published by the
29 * Free Software Foundation; either version 2, or (at your option) any
32 * This program is distributed in the hope that it will be useful, but
33 * WITHOUT ANY WARRANTY; without even the implied warranty of
34 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35 * General Public License for more details.
37 * You should have received a copy of the GNU General Public License along
38 * with this program; if not, write to the Free Software Foundation, Inc.,
39 * 675 Mass Ave, Cambridge, MA 02139, USA.
45 #include <linux/usb.h>
46 #include <linux/usb_usual.h>
47 #include <linux/blkdev.h>
48 #include <linux/completion.h>
49 #include <linux/mutex.h>
50 #include <scsi/scsi_host.h>
56 * Unusual device list definitions
59 struct us_unusual_dev
{
60 const char* vendorName
;
61 const char* productName
;
64 int (*initFunction
)(struct us_data
*);
68 /* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
69 #define US_FLIDX_URB_ACTIVE 0 /* current_urb is in use */
70 #define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
71 #define US_FLIDX_ABORTING 2 /* abort is in progress */
72 #define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
73 #define US_FLIDX_RESETTING 4 /* device reset in progress */
74 #define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
75 #define US_FLIDX_DONT_SCAN 6 /* don't scan (disconnect) */
77 #define USB_STOR_STRING_LEN 32
80 * We provide a DMA-mapped I/O buffer for use with small USB transfers.
81 * It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
82 * 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
83 * size we'll allocate.
86 #define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
87 #define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
89 typedef int (*trans_cmnd
)(struct scsi_cmnd
*, struct us_data
*);
90 typedef int (*trans_reset
)(struct us_data
*);
91 typedef void (*proto_cmnd
)(struct scsi_cmnd
*, struct us_data
*);
92 typedef void (*extra_data_destructor
)(void *); /* extra data destructor */
93 typedef void (*pm_hook
)(struct us_data
*, int); /* power management hook */
98 /* we allocate one of these for every device that we remember */
100 /* The device we're working with
101 * It's important to note:
102 * (o) you must hold dev_mutex to change pusb_dev
104 struct mutex dev_mutex
; /* protect pusb_dev */
105 struct usb_device
*pusb_dev
; /* this usb_device */
106 struct usb_interface
*pusb_intf
; /* this interface */
107 struct us_unusual_dev
*unusual_dev
; /* device-filter entry */
108 unsigned long fflags
; /* fixed flags from filter */
109 unsigned long dflags
; /* dynamic atomic bitflags */
110 unsigned int send_bulk_pipe
; /* cached pipe values */
111 unsigned int recv_bulk_pipe
;
112 unsigned int send_ctrl_pipe
;
113 unsigned int recv_ctrl_pipe
;
114 unsigned int recv_intr_pipe
;
116 /* information about the device */
117 char *transport_name
;
119 __le32 bcs_signature
;
124 u8 ifnum
; /* interface number */
125 u8 ep_bInterval
; /* interrupt interval */
127 /* function pointers for this device */
128 trans_cmnd transport
; /* transport function */
129 trans_reset transport_reset
; /* transport device reset */
130 proto_cmnd proto_handler
; /* protocol handler */
132 /* SCSI interfaces */
133 struct scsi_cmnd
*srb
; /* current srb */
134 unsigned int tag
; /* current dCBWTag */
136 /* control and bulk communications data */
137 struct urb
*current_urb
; /* USB requests */
138 struct usb_ctrlrequest
*cr
; /* control requests */
139 struct usb_sg_request current_sg
; /* scatter-gather req. */
140 unsigned char *iobuf
; /* I/O buffer */
141 dma_addr_t cr_dma
; /* buffer DMA addresses */
142 dma_addr_t iobuf_dma
;
143 struct task_struct
*ctl_thread
; /* the control thread */
145 /* mutual exclusion and synchronization structures */
146 struct completion cmnd_ready
; /* to sleep thread on */
147 struct completion notify
; /* thread begin/end */
148 wait_queue_head_t delay_wait
; /* wait during scan, reset */
149 struct completion scanning_done
; /* wait for scan thread */
151 /* subdriver information */
152 void *extra
; /* Any extra data */
153 extra_data_destructor extra_destructor
;/* extra data destructor */
155 pm_hook suspend_resume_hook
;
159 /* Convert between us_data and the corresponding Scsi_Host */
160 static inline struct Scsi_Host
*us_to_host(struct us_data
*us
) {
161 return container_of((void *) us
, struct Scsi_Host
, hostdata
);
163 static inline struct us_data
*host_to_us(struct Scsi_Host
*host
) {
164 return (struct us_data
*) host
->hostdata
;
167 /* Function to fill an inquiry response. See usb.c for details */
168 extern void fill_inquiry_response(struct us_data
*us
,
169 unsigned char *data
, unsigned int data_len
);
171 /* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
172 * single queue element srb for write access */
173 #define scsi_unlock(host) spin_unlock_irq(host->host_lock)
174 #define scsi_lock(host) spin_lock_irq(host->host_lock)