1 /* Special Initializers for certain USB Mass Storage devices 2 * 3 * $Id: initializers.c,v 1.2 2000/09/06 22:35:57 mdharm Exp $ 4 * 5 * Current development and maintenance by: 6 * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 7 * 8 * This driver is based on the 'USB Mass Storage Class' document. This 9 * describes in detail the protocol used to communicate with such 10 * devices. Clearly, the designers had SCSI and ATAPI commands in 11 * mind when they created this document. The commands are all very 12 * similar to commands in the SCSI-II and ATAPI specifications. 13 * 14 * It is important to note that in a number of cases this class 15 * exhibits class-specific exemptions from the USB specification. 16 * Notably the usage of NAK, STALL and ACK differs from the norm, in 17 * that they are used to communicate wait, failed and OK on commands. 18 * 19 * Also, for certain devices, the interrupt endpoint is used to convey 20 * status of a command. 21 * 22 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more 23 * information about this driver. 24 * 25 * This program is free software; you can redistribute it and/or modify it 26 * under the terms of the GNU General Public License as published by the 27 * Free Software Foundation; either version 2, or (at your option) any 28 * later version. 29 * 30 * This program is distributed in the hope that it will be useful, but 31 * WITHOUT ANY WARRANTY; without even the implied warranty of 32 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 33 * General Public License for more details. 34 * 35 * You should have received a copy of the GNU General Public License along 36 * with this program; if not, write to the Free Software Foundation, Inc., 37 * 675 Mass Ave, Cambridge, MA 02139, USA. 38 */ 39 40 #include <linux/sched.h> 41 #include <linux/errno.h> 42 43 #include "usb.h" 44 #include "initializers.h" 45 #include "debug.h" 46 #include "transport.h" 47 48 /* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target 49 * mode */ 50 int usb_stor_euscsi_init(struct us_data *us) 51 { 52 int result; 53 54 US_DEBUGP("Attempting to init eUSCSI bridge...\n"); 55 us->iobuf[0] = 0x1; 56 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 57 0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR, 58 0x01, 0x0, us->iobuf, 0x1, 5*HZ); 59 US_DEBUGP("-- result is %d\n", result); 60 61 return 0; 62 } 63 64 /* This function is required to activate all four slots on the UCR-61S2B 65 * flash reader */ 66 int usb_stor_ucr61s2b_init(struct us_data *us) 67 { 68 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf; 69 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf; 70 int res, partial; 71 static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS"; 72 73 US_DEBUGP("Sending UCR-61S2B initialization packet...\n"); 74 75 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 76 bcb->Tag = 0; 77 bcb->DataTransferLength = cpu_to_le32(0); 78 bcb->Flags = bcb->Lun = 0; 79 bcb->Length = sizeof(init_string) - 1; 80 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 81 memcpy(bcb->CDB, init_string, sizeof(init_string) - 1); 82 83 res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb, 84 US_BULK_CB_WRAP_LEN, &partial); 85 if(res) 86 return res; 87 88 US_DEBUGP("Getting status packet...\n"); 89 res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, 90 US_BULK_CS_WRAP_LEN, &partial); 91 92 return (res ? -1 : 0); 93 } 94