cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

initializers.c (2835B)

      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 */
     34int 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 */
     51int 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 */
     84int 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}