1 /* Driver for USB Mass Storage compliant devices
2 * Main Header File
3 *
4 * Current development and maintenance by:
5 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
6 *
7 * Initial work by:
8 * (c) 1999 Michael Gee (michael@linuxspecific.com)
9 *
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.
15 *
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.
20 *
21 * Also, for certain devices, the interrupt endpoint is used to convey
22 * status of a command.
23 *
24 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
25 * information about this driver.
26 *
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
30 * later version.
31 *
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.
36 *
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.
40 */
41
42 #ifndef _USB_H_
43 #define _USB_H_
44
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 <linux/workqueue.h>
51 #include <scsi/scsi_host.h>
52
53 struct us_data;
54 struct scsi_cmnd;
55
56 /*
57 * Unusual device list definitions
58 */
59
60 struct us_unusual_dev {
61 const char* vendorName;
62 const char* productName;
63 __u8 useProtocol;
64 __u8 useTransport;
65 int (*initFunction)(struct us_data *);
66 };
67
68
69 /* Dynamic bitflag definitions (us->dflags): used in set_bit() etc. */
70 #define US_FLIDX_URB_ACTIVE 0 /* current_urb is in use */
71 #define US_FLIDX_SG_ACTIVE 1 /* current_sg is in use */
72 #define US_FLIDX_ABORTING 2 /* abort is in progress */
73 #define US_FLIDX_DISCONNECTING 3 /* disconnect in progress */
74 #define US_FLIDX_RESETTING 4 /* device reset in progress */
75 #define US_FLIDX_TIMED_OUT 5 /* SCSI midlayer timed out */
76 #define US_FLIDX_SCAN_PENDING 6 /* scanning not yet done */
77 #define US_FLIDX_REDO_READ10 7 /* redo READ(10) command */
78 #define US_FLIDX_READ10_WORKED 8 /* previous READ(10) succeeded */
79
80 #define USB_STOR_STRING_LEN 32
81
82 /*
83 * We provide a DMA-mapped I/O buffer for use with small USB transfers.
84 * It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a
85 * 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the
86 * size we'll allocate.
87 */
88
89 #define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */
90 #define US_SENSE_SIZE 18 /* Size of the autosense data buffer */
91
92 typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*);
93 typedef int (*trans_reset)(struct us_data*);
94 typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*);
95 typedef void (*extra_data_destructor)(void *); /* extra data destructor */
96 typedef void (*pm_hook)(struct us_data *, int); /* power management hook */
97
98 #define US_SUSPEND 0
99 #define US_RESUME 1
100
101 /* we allocate one of these for every device that we remember */
102 struct us_data {
103 /* The device we're working with
104 * It's important to note:
105 * (o) you must hold dev_mutex to change pusb_dev
106 */
107 struct mutex dev_mutex; /* protect pusb_dev */
108 struct usb_device *pusb_dev; /* this usb_device */
109 struct usb_interface *pusb_intf; /* this interface */
110 struct us_unusual_dev *unusual_dev; /* device-filter entry */
111 unsigned long fflags; /* fixed flags from filter */
112 unsigned long dflags; /* dynamic atomic bitflags */
113 unsigned int send_bulk_pipe; /* cached pipe values */
114 unsigned int recv_bulk_pipe;
115 unsigned int send_ctrl_pipe;
116 unsigned int recv_ctrl_pipe;
117 unsigned int recv_intr_pipe;
118
119 /* information about the device */
120 char *transport_name;
121 char *protocol_name;
122 __le32 bcs_signature;
123 u8 subclass;
124 u8 protocol;
125 u8 max_lun;
126
127 u8 ifnum; /* interface number */
128 u8 ep_bInterval; /* interrupt interval */
129
130 /* function pointers for this device */
131 trans_cmnd transport; /* transport function */
132 trans_reset transport_reset; /* transport device reset */
133 proto_cmnd proto_handler; /* protocol handler */
134
135 /* SCSI interfaces */
136 struct scsi_cmnd *srb; /* current srb */
137 unsigned int tag; /* current dCBWTag */
138 char scsi_name[32]; /* scsi_host name */
139
140 /* control and bulk communications data */
141 struct urb *current_urb; /* USB requests */
142 struct usb_ctrlrequest *cr; /* control requests */
143 struct usb_sg_request current_sg; /* scatter-gather req. */
144 unsigned char *iobuf; /* I/O buffer */
145 dma_addr_t iobuf_dma; /* buffer DMA addresses */
146 struct task_struct *ctl_thread; /* the control thread */
147
148 /* mutual exclusion and synchronization structures */
149 struct completion cmnd_ready; /* to sleep thread on */
150 struct completion notify; /* thread begin/end */
151 wait_queue_head_t delay_wait; /* wait during reset */
152 struct delayed_work scan_dwork; /* for async scanning */
153
154 /* subdriver information */
155 void *extra; /* Any extra data */
156 extra_data_destructor extra_destructor;/* extra data destructor */
157 #ifdef CONFIG_PM
158 pm_hook suspend_resume_hook;
159 #endif
160
161 /* hacks for READ CAPACITY bug handling */
162 int use_last_sector_hacks;
163 int last_sector_retries;
164 };
165
166 /* Convert between us_data and the corresponding Scsi_Host */
us_to_host(struct us_data * us)167 static inline struct Scsi_Host *us_to_host(struct us_data *us) {
168 return container_of((void *) us, struct Scsi_Host, hostdata);
169 }
host_to_us(struct Scsi_Host * host)170 static inline struct us_data *host_to_us(struct Scsi_Host *host) {
171 return (struct us_data *) host->hostdata;
172 }
173
174 /* Function to fill an inquiry response. See usb.c for details */
175 extern void fill_inquiry_response(struct us_data *us,
176 unsigned char *data, unsigned int data_len);
177
178 /* The scsi_lock() and scsi_unlock() macros protect the sm_state and the
179 * single queue element srb for write access */
180 #define scsi_unlock(host) spin_unlock_irq(host->host_lock)
181 #define scsi_lock(host) spin_lock_irq(host->host_lock)
182
183 /* General routines provided by the usb-storage standard core */
184 #ifdef CONFIG_PM
185 extern int usb_stor_suspend(struct usb_interface *iface, pm_message_t message);
186 extern int usb_stor_resume(struct usb_interface *iface);
187 extern int usb_stor_reset_resume(struct usb_interface *iface);
188 #else
189 #define usb_stor_suspend NULL
190 #define usb_stor_resume NULL
191 #define usb_stor_reset_resume NULL
192 #endif
193
194 extern int usb_stor_pre_reset(struct usb_interface *iface);
195 extern int usb_stor_post_reset(struct usb_interface *iface);
196
197 extern int usb_stor_probe1(struct us_data **pus,
198 struct usb_interface *intf,
199 const struct usb_device_id *id,
200 struct us_unusual_dev *unusual_dev,
201 struct scsi_host_template *sht);
202 extern int usb_stor_probe2(struct us_data *us);
203 extern void usb_stor_disconnect(struct usb_interface *intf);
204
205 extern void usb_stor_adjust_quirks(struct usb_device *dev,
206 unsigned long *fflags);
207
208 #define module_usb_stor_driver(__driver, __sht, __name) \
209 static int __init __driver##_init(void) \
210 { \
211 usb_stor_host_template_init(&(__sht), __name, THIS_MODULE); \
212 return usb_register(&(__driver)); \
213 } \
214 module_init(__driver##_init); \
215 static void __exit __driver##_exit(void) \
216 { \
217 usb_deregister(&(__driver)); \
218 } \
219 module_exit(__driver##_exit)
220
221 #endif
222