drivers/usb/storage/initializers.c

   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/errno.h>
  41
  42 #include "usb.h"
  43 #include "initializers.h"
  44 #include "debug.h"
  45 #include "transport.h"
  46
  47 /* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target
  48  * mode */
  49 int usb_stor_euscsi_init(struct us_data *us)
  50 {
  51         int result;
  52
  53         US_DEBUGP("Attempting to init eUSCSI bridge...\n");
  54         us->iobuf[0] = 0x1;
  55         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
  56                         0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR,
  57                         0x01, 0x0, us->iobuf, 0x1, 5*HZ);
  58         US_DEBUGP("-- result is %d\n", result);
  59
  60         return 0;
  61 }
  62
  63 /* This function is required to activate all four slots on the UCR-61S2B
  64  * flash reader */
  65 int usb_stor_ucr61s2b_init(struct us_data *us)
  66 {
  67         struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf;
  68         struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf;
  69         int res, partial;
  70         static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS";
  71
  72         US_DEBUGP("Sending UCR-61S2B initialization packet...\n");
  73
  74         bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
  75         bcb->Tag = 0;
  76         bcb->DataTransferLength = cpu_to_le32(0);
  77         bcb->Flags = bcb->Lun = 0;
  78         bcb->Length = sizeof(init_string) - 1;
  79         memset(bcb->CDB, 0, sizeof(bcb->CDB));
  80         memcpy(bcb->CDB, init_string, sizeof(init_string) - 1);
  81
  82         res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb,
  83                         US_BULK_CB_WRAP_LEN, &partial);
  84         if(res)
  85                 return res;
  86
  87         US_DEBUGP("Getting status packet...\n");
  88         res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
  89                         US_BULK_CS_WRAP_LEN, &partial);
  90
  91         return (res ? -1 : 0);
  92 }