drivers/usb/storage/initializers.c

   1 /* Special Initializers for certain USB Mass Storage devices
   2  *
   3  * Current development and maintenance by:
   4  *   (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
   5  *
   6  * This driver is based on the 'USB Mass Storage Class' document. This
   7  * describes in detail the protocol used to communicate with such
   8  * devices.  Clearly, the designers had SCSI and ATAPI commands in
   9  * mind when they created this document.  The commands are all very
  10  * similar to commands in the SCSI-II and ATAPI specifications.
  11  *
  12  * It is important to note that in a number of cases this class
  13  * exhibits class-specific exemptions from the USB specification.
  14  * Notably the usage of NAK, STALL and ACK differs from the norm, in
  15  * that they are used to communicate wait, failed and OK on commands.
  16  *
  17  * Also, for certain devices, the interrupt endpoint is used to convey
  18  * status of a command.
  19  *
  20  * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
  21  * information about this driver.
  22  *
  23  * This program is free software; you can redistribute it and/or modify it
  24  * under the terms of the GNU General Public License as published by the
  25  * Free Software Foundation; either version 2, or (at your option) any
  26  * later version.
  27  *
  28  * This program is distributed in the hope that it will be useful, but
  29  * WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * General Public License for more details.
  32  *
  33  * You should have received a copy of the GNU General Public License along
  34  * with this program; if not, write to the Free Software Foundation, Inc.,
  35  * 675 Mass Ave, Cambridge, MA 02139, USA.
  36  */
  37
  38 #include <linux/errno.h>
  39
  40 #include "usb.h"
  41 #include "initializers.h"
  42 #include "debug.h"
  43 #include "transport.h"
  44
  45 /* This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target
  46  * mode */
  47 int usb_stor_euscsi_init(struct us_data *us)
  48 {
  49         int result;
  50
  51         US_DEBUGP("Attempting to init eUSCSI bridge...\n");
  52         us->iobuf[0] = 0x1;
  53         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
  54                         0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR,
  55                         0x01, 0x0, us->iobuf, 0x1, 5000);
  56         US_DEBUGP("-- result is %d\n", result);
  57
  58         return 0;
  59 }
  60
  61 /* This function is required to activate all four slots on the UCR-61S2B
  62  * flash reader */
  63 int usb_stor_ucr61s2b_init(struct us_data *us)
  64 {
  65         struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf;
  66         struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf;
  67         int res;
  68         unsigned int partial;
  69         static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS";
  70
  71         US_DEBUGP("Sending UCR-61S2B initialization packet...\n");
  72
  73         bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
  74         bcb->Tag = 0;
  75         bcb->DataTransferLength = cpu_to_le32(0);
  76         bcb->Flags = bcb->Lun = 0;
  77         bcb->Length = sizeof(init_string) - 1;
  78         memset(bcb->CDB, 0, sizeof(bcb->CDB));
  79         memcpy(bcb->CDB, init_string, sizeof(init_string) - 1);
  80
  81         res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb,
  82                         US_BULK_CB_WRAP_LEN, &partial);
  83         if (res)
  84                 return -EIO;
  85
  86         US_DEBUGP("Getting status packet...\n");
  87         res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs,
  88                         US_BULK_CS_WRAP_LEN, &partial);
  89         if (res)
  90                 return -EIO;
  91
  92         return 0;
  93 }
  94
  95 /* This places the HUAWEI E220 devices in multi-port mode */
  96 int usb_stor_huawei_e220_init(struct us_data *us)
  97 {
  98         int result;
  99
 100         result = usb_stor_control_msg(us, us->send_ctrl_pipe,
 101                                       USB_REQ_SET_FEATURE,
 102                                       USB_TYPE_STANDARD | USB_RECIP_DEVICE,
 103                                       0x01, 0x0, NULL, 0x0, 1000);
 104         US_DEBUGP("Huawei mode set result is %d\n", result);
 105         return (result ? 0 : -ENODEV);
 106 }