1 /* Driver for USB Mass Storage compliant devices 2 * Main Header File 3 * 4 * $Id: usb.h,v 1.21 2002/04/21 02:57:59 mdharm Exp $ 5 * 6 * Current development and maintenance by: 7 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 8 * 9 * Initial work by: 10 * (c) 1999 Michael Gee (michael@linuxspecific.com) 11 * 12 * This driver is based on the 'USB Mass Storage Class' document. This 13 * describes in detail the protocol used to communicate with such 14 * devices. Clearly, the designers had SCSI and ATAPI commands in 15 * mind when they created this document. The commands are all very 16 * similar to commands in the SCSI-II and ATAPI specifications. 17 * 18 * It is important to note that in a number of cases this class 19 * exhibits class-specific exemptions from the USB specification. 20 * Notably the usage of NAK, STALL and ACK differs from the norm, in 21 * that they are used to communicate wait, failed and OK on commands. 22 * 23 * Also, for certain devices, the interrupt endpoint is used to convey 24 * status of a command. 25 * 26 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more 27 * information about this driver. 28 * 29 * This program is free software; you can redistribute it and/or modify it 30 * under the terms of the GNU General Public License as published by the 31 * Free Software Foundation; either version 2, or (at your option) any 32 * later version. 33 * 34 * This program is distributed in the hope that it will be useful, but 35 * WITHOUT ANY WARRANTY; without even the implied warranty of 36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 37 * General Public License for more details. 38 * 39 * You should have received a copy of the GNU General Public License along 40 * with this program; if not, write to the Free Software Foundation, Inc., 41 * 675 Mass Ave, Cambridge, MA 02139, USA. 42 */ 43 44 #ifndef _USB_H_ 45 #define _USB_H_ 46 47 #include <linux/usb.h> 48 #include <linux/usb_usual.h> 49 #include <linux/blkdev.h> 50 #include <linux/completion.h> 51 #include <linux/mutex.h> 52 #include <scsi/scsi_host.h> 53 54 struct us_data; 55 struct scsi_cmnd; 56 57 /* 58 * Unusual device list definitions 59 */ 60 61 struct us_unusual_dev { 62 const char* vendorName; 63 const char* productName; 64 __u8 useProtocol; 65 __u8 useTransport; 66 int (*initFunction)(struct us_data *); 67 }; 68 69 70 /* Dynamic flag definitions: used in set_bit() etc. */ 71 #define US_FLIDX_URB_ACTIVE 18 /* 0x00040000 current_urb is in use */ 72 #define US_FLIDX_SG_ACTIVE 19 /* 0x00080000 current_sg is in use */ 73 #define US_FLIDX_ABORTING 20 /* 0x00100000 abort is in progress */ 74 #define US_FLIDX_DISCONNECTING 21 /* 0x00200000 disconnect in progress */ 75 #define ABORTING_OR_DISCONNECTING ((1UL << US_FLIDX_ABORTING) | \ 76 (1UL << US_FLIDX_DISCONNECTING)) 77 #define US_FLIDX_RESETTING 22 /* 0x00400000 device reset in progress */ 78 #define US_FLIDX_TIMED_OUT 23 /* 0x00800000 SCSI midlayer timed out */ 79 80 81 #define USB_STOR_STRING_LEN 32 82 83 /* 84 * We provide a DMA-mapped I/O buffer for use with small USB transfers. 85 * It turns out that CB[I] needs a 12-byte buffer and Bulk-only needs a 86 * 31-byte buffer. But Freecom needs a 64-byte buffer, so that's the 87 * size we'll allocate. 88 */ 89 90 #define US_IOBUF_SIZE 64 /* Size of the DMA-mapped I/O buffer */ 91 #define US_SENSE_SIZE 18 /* Size of the autosense data buffer */ 92 93 typedef int (*trans_cmnd)(struct scsi_cmnd *, struct us_data*); 94 typedef int (*trans_reset)(struct us_data*); 95 typedef void (*proto_cmnd)(struct scsi_cmnd*, struct us_data*); 96 typedef void (*extra_data_destructor)(void *); /* extra data destructor */ 97 typedef void (*pm_hook)(struct us_data *, int); /* power management hook */ 98 99 #define US_SUSPEND 0 100 #define US_RESUME 1 101 102 /* we allocate one of these for every device that we remember */ 103 struct us_data { 104 /* The device we're working with 105 * It's important to note: 106 * (o) you must hold dev_mutex to change pusb_dev 107 */ 108 struct mutex dev_mutex; /* protect pusb_dev */ 109 struct usb_device *pusb_dev; /* this usb_device */ 110 struct usb_interface *pusb_intf; /* this interface */ 111 struct us_unusual_dev *unusual_dev; /* device-filter entry */ 112 unsigned long flags; /* from filter initially */ 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 */ 138 139 /* control and bulk communications data */ 140 struct urb *current_urb; /* USB requests */ 141 struct usb_ctrlrequest *cr; /* control requests */ 142 struct usb_sg_request current_sg; /* scatter-gather req. */ 143 unsigned char *iobuf; /* I/O buffer */ 144 unsigned char *sensebuf; /* sense data buffer */ 145 dma_addr_t cr_dma; /* buffer DMA addresses */ 146 dma_addr_t iobuf_dma; 147 struct task_struct *ctl_thread; /* the control thread */ 148 149 /* mutual exclusion and synchronization structures */ 150 struct semaphore sema; /* to sleep thread on */ 151 struct completion notify; /* thread begin/end */ 152 wait_queue_head_t delay_wait; /* wait during scan, reset */ 153 struct completion scanning_done; /* wait for scan thread */ 154 155 /* subdriver information */ 156 void *extra; /* Any extra data */ 157 extra_data_destructor extra_destructor;/* extra data destructor */ 158 #ifdef CONFIG_PM 159 pm_hook suspend_resume_hook; 160 #endif 161 }; 162 163 /* Convert between us_data and the corresponding Scsi_Host */ 164 static inline struct Scsi_Host *us_to_host(struct us_data *us) { 165 return container_of((void *) us, struct Scsi_Host, hostdata); 166 } 167 static inline struct us_data *host_to_us(struct Scsi_Host *host) { 168 return (struct us_data *) host->hostdata; 169 } 170 171 /* Function to fill an inquiry response. See usb.c for details */ 172 extern void fill_inquiry_response(struct us_data *us, 173 unsigned char *data, unsigned int data_len); 174 175 /* The scsi_lock() and scsi_unlock() macros protect the sm_state and the 176 * single queue element srb for write access */ 177 #define scsi_unlock(host) spin_unlock_irq(host->host_lock) 178 #define scsi_lock(host) spin_lock_irq(host->host_lock) 179 180 #endif 181