1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Special Initializers for certain USB Mass Storage devices 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 /* 48 * This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target 49 * mode 50 */ 51 int usb_stor_euscsi_init(struct us_data *us) 52 { 53 int result; 54 55 usb_stor_dbg(us, "Attempting to init eUSCSI bridge...\n"); 56 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 57 0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR, 58 0x01, 0x0, NULL, 0x0, 5 * HZ); 59 usb_stor_dbg(us, "-- result is %d\n", result); 60 61 return 0; 62 } 63 64 /* 65 * This function is required to activate all four slots on the UCR-61S2B 66 * flash reader 67 */ 68 int usb_stor_ucr61s2b_init(struct us_data *us) 69 { 70 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf; 71 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf; 72 int res; 73 unsigned int partial; 74 static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS"; 75 76 usb_stor_dbg(us, "Sending UCR-61S2B initialization packet...\n"); 77 78 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 79 bcb->Tag = 0; 80 bcb->DataTransferLength = cpu_to_le32(0); 81 bcb->Flags = bcb->Lun = 0; 82 bcb->Length = sizeof(init_string) - 1; 83 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 84 memcpy(bcb->CDB, init_string, sizeof(init_string) - 1); 85 86 res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb, 87 US_BULK_CB_WRAP_LEN, &partial); 88 if (res) 89 return -EIO; 90 91 usb_stor_dbg(us, "Getting status packet...\n"); 92 res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, 93 US_BULK_CS_WRAP_LEN, &partial); 94 if (res) 95 return -EIO; 96 97 return 0; 98 } 99 100 /* This places the HUAWEI E220 devices in multi-port mode */ 101 int usb_stor_huawei_e220_init(struct us_data *us) 102 { 103 int result; 104 105 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 106 USB_REQ_SET_FEATURE, 107 USB_TYPE_STANDARD | USB_RECIP_DEVICE, 108 0x01, 0x0, NULL, 0x0, 1 * HZ); 109 usb_stor_dbg(us, "Huawei mode set result is %d\n", result); 110 return 0; 111 } 112