1 // SPDX-License-Identifier: GPL-2.0+
6  *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
9  *   (c) 2000 David L. Brown, Jr. (usb-[email protected])
19  * similar to commands in the SCSI-II and ATAPI specifications.
22  * exhibits class-specific exemptions from the USB specification.
54 	for (; srb->cmd_len < 12; srb->cmd_len++)  in usb_stor_pad12_command()
55 		srb->cmnd[srb->cmd_len] = 0;  in usb_stor_pad12_command()
57 	/* send the command to the transport layer */  in usb_stor_pad12_command()
64 	 * fix some commands -- this is a form of mode translation  in usb_stor_ufi_command()
72 	for (; srb->cmd_len < 12; srb->cmd_len++)  in usb_stor_ufi_command()
73 		srb->cmnd[srb->cmd_len] = 0;  in usb_stor_ufi_command()
75 	/* set command length to 12 bytes (this affects the transport layer) */  in usb_stor_ufi_command()
76 	srb->cmd_len = 12;  in usb_stor_ufi_command()
78 	/* XXX We should be constantly re-evaluating the need for these */  in usb_stor_ufi_command()
81 	switch (srb->cmnd[0]) {  in usb_stor_ufi_command()
85 		srb->cmnd[4] = 36;  in usb_stor_ufi_command()
90 		srb->cmnd[7] = 0;  in usb_stor_ufi_command()
91 		srb->cmnd[8] = 8;  in usb_stor_ufi_command()
96 		srb->cmnd[4] = 18;  in usb_stor_ufi_command()
100 	/* send the command to the transport layer */  in usb_stor_ufi_command()
107 	/* send the command to the transport layer */  in usb_stor_transparent_scsi_command()
113  * Scatter-gather transfer buffer access routines
117  * Copy a buffer of length buflen to/from the srb's transfer buffer.
118  * Update the **sgptr and *offset variables so that the next copy will
121 unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,  in usb_stor_access_xfer_buf()  argument
123 	unsigned int *offset, enum xfer_buf_dir dir)  in usb_stor_access_xfer_buf()  argument
138 	if (!sg_miter_skip(&miter, *offset))  in usb_stor_access_xfer_buf()
143 				buflen - cnt);  in usb_stor_access_xfer_buf()
146 			memcpy(buffer + cnt, miter.addr, len);  in usb_stor_access_xfer_buf()
148 			memcpy(miter.addr, buffer + cnt, len);  in usb_stor_access_xfer_buf()
150 		if (*offset + len < miter.piter.sg->length) {  in usb_stor_access_xfer_buf()
151 			*offset += len;  in usb_stor_access_xfer_buf()
154 			*offset = 0;  in usb_stor_access_xfer_buf()
166  * Store the contents of buffer into srb's transfer buffer and set the
169 void usb_stor_set_xfer_buf(unsigned char *buffer,  in usb_stor_set_xfer_buf()  argument
172 	unsigned int offset = 0;  in usb_stor_set_xfer_buf()  local
176 	buflen = usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,  in usb_stor_set_xfer_buf()
179 		scsi_set_resid(srb, scsi_bufflen(srb) - buflen);  in usb_stor_set_xfer_buf()