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 26 #include <linux/errno.h> 27 28 #include "usb.h" 29 #include "initializers.h" 30 #include "debug.h" 31 #include "transport.h" 32 33 /* 34 * This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target 35 * mode 36 */ 37 int usb_stor_euscsi_init(struct us_data *us) 38 { 39 int result; 40 41 usb_stor_dbg(us, "Attempting to init eUSCSI bridge...\n"); 42 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 43 0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR, 44 0x01, 0x0, NULL, 0x0, 5 * HZ); 45 usb_stor_dbg(us, "-- result is %d\n", result); 46 47 return 0; 48 } 49 50 /* 51 * This function is required to activate all four slots on the UCR-61S2B 52 * flash reader 53 */ 54 int usb_stor_ucr61s2b_init(struct us_data *us) 55 { 56 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf; 57 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf; 58 int res; 59 unsigned int partial; 60 static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS"; 61 62 usb_stor_dbg(us, "Sending UCR-61S2B initialization packet...\n"); 63 64 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 65 bcb->Tag = 0; 66 bcb->DataTransferLength = cpu_to_le32(0); 67 bcb->Flags = bcb->Lun = 0; 68 bcb->Length = sizeof(init_string) - 1; 69 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 70 memcpy(bcb->CDB, init_string, sizeof(init_string) - 1); 71 72 res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb, 73 US_BULK_CB_WRAP_LEN, &partial); 74 if (res) 75 return -EIO; 76 77 usb_stor_dbg(us, "Getting status packet...\n"); 78 res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, 79 US_BULK_CS_WRAP_LEN, &partial); 80 if (res) 81 return -EIO; 82 83 return 0; 84 } 85 86 /* This places the HUAWEI E220 devices in multi-port mode */ 87 int usb_stor_huawei_e220_init(struct us_data *us) 88 { 89 int result; 90 91 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 92 USB_REQ_SET_FEATURE, 93 USB_TYPE_STANDARD | USB_RECIP_DEVICE, 94 0x01, 0x0, NULL, 0x0, 1 * HZ); 95 usb_stor_dbg(us, "Huawei mode set result is %d\n", result); 96 return 0; 97 } 98