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