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 23 #include <linux/errno.h> 24 25 #include "usb.h" 26 #include "initializers.h" 27 #include "debug.h" 28 #include "transport.h" 29 30 /* 31 * This places the Shuttle/SCM USB<->SCSI bridge devices in multi-target 32 * mode 33 */ 34 int usb_stor_euscsi_init(struct us_data *us) 35 { 36 int result; 37 38 usb_stor_dbg(us, "Attempting to init eUSCSI bridge...\n"); 39 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 40 0x0C, USB_RECIP_INTERFACE | USB_TYPE_VENDOR, 41 0x01, 0x0, NULL, 0x0, 5 * HZ); 42 usb_stor_dbg(us, "-- result is %d\n", result); 43 44 return 0; 45 } 46 47 /* 48 * This function is required to activate all four slots on the UCR-61S2B 49 * flash reader 50 */ 51 int usb_stor_ucr61s2b_init(struct us_data *us) 52 { 53 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap*) us->iobuf; 54 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap*) us->iobuf; 55 int res; 56 unsigned int partial; 57 static char init_string[] = "\xec\x0a\x06\x00$PCCHIPS"; 58 59 usb_stor_dbg(us, "Sending UCR-61S2B initialization packet...\n"); 60 61 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 62 bcb->Tag = 0; 63 bcb->DataTransferLength = cpu_to_le32(0); 64 bcb->Flags = bcb->Lun = 0; 65 bcb->Length = sizeof(init_string) - 1; 66 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 67 memcpy(bcb->CDB, init_string, sizeof(init_string) - 1); 68 69 res = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, bcb, 70 US_BULK_CB_WRAP_LEN, &partial); 71 if (res) 72 return -EIO; 73 74 usb_stor_dbg(us, "Getting status packet...\n"); 75 res = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, bcs, 76 US_BULK_CS_WRAP_LEN, &partial); 77 if (res) 78 return -EIO; 79 80 return 0; 81 } 82 83 /* This places the HUAWEI E220 devices in multi-port mode */ 84 int usb_stor_huawei_e220_init(struct us_data *us) 85 { 86 int result; 87 88 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 89 USB_REQ_SET_FEATURE, 90 USB_TYPE_STANDARD | USB_RECIP_DEVICE, 91 0x01, 0x0, NULL, 0x0, 1 * HZ); 92 usb_stor_dbg(us, "Huawei mode set result is %d\n", result); 93 return 0; 94 } 95