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  */
usb_stor_euscsi_init(struct us_data * us)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  */
usb_stor_ucr61s2b_init(struct us_data * us)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 */
usb_stor_huawei_e220_init(struct us_data * us)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