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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 */
37int 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 */
54int 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 */
87int 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}