| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Driver for USB Mass Storage compliant devices |
| * Transport Functions Header File |
| * |
| * Current development and maintenance by: |
| * (c) 1999, 2000 Matthew Dharm (mdharm-usb@one-eyed-alien.net) |
| * |
| * This driver is based on the 'USB Mass Storage Class' document. This |
| * describes in detail the protocol used to communicate with such |
| * devices. Clearly, the designers had SCSI and ATAPI commands in |
| * mind when they created this document. The commands are all very |
| * similar to commands in the SCSI-II and ATAPI specifications. |
| * |
| * It is important to note that in a number of cases this class |
| * exhibits class-specific exemptions from the USB specification. |
| * Notably the usage of NAK, STALL and ACK differs from the norm, in |
| * that they are used to communicate wait, failed and OK on commands. |
| * |
| * Also, for certain devices, the interrupt endpoint is used to convey |
| * status of a command. |
| */ |
| |
| #ifndef _TRANSPORT_H_ |
| #define _TRANSPORT_H_ |
| |
| #include <linux/blkdev.h> |
| |
| /* |
| * usb_stor_bulk_transfer_xxx() return codes, in order of severity |
| */ |
| |
| #define USB_STOR_XFER_GOOD 0 /* good transfer */ |
| #define USB_STOR_XFER_SHORT 1 /* transferred less than expected */ |
| #define USB_STOR_XFER_STALLED 2 /* endpoint stalled */ |
| #define USB_STOR_XFER_LONG 3 /* device tried to send too much */ |
| #define USB_STOR_XFER_ERROR 4 /* transfer died in the middle */ |
| |
| /* |
| * Transport return codes |
| */ |
| |
| #define USB_STOR_TRANSPORT_GOOD 0 /* Transport good, command good */ |
| #define USB_STOR_TRANSPORT_FAILED 1 /* Transport good, command failed */ |
| #define USB_STOR_TRANSPORT_NO_SENSE 2 /* Command failed, no auto-sense */ |
| #define USB_STOR_TRANSPORT_ERROR 3 /* Transport bad (i.e. device dead) */ |
| |
| /* |
| * We used to have USB_STOR_XFER_ABORTED and USB_STOR_TRANSPORT_ABORTED |
| * return codes. But now the transport and low-level transfer routines |
| * treat an abort as just another error (-ENOENT for a cancelled URB). |
| * It is up to the invoke_transport() function to test for aborts and |
| * distinguish them from genuine communication errors. |
| */ |
| |
| /* |
| * CBI accept device specific command |
| */ |
| |
| #define US_CBI_ADSC 0 |
| |
| extern int usb_stor_CB_transport(struct scsi_cmnd *, struct us_data*); |
| extern int usb_stor_CB_reset(struct us_data*); |
| |
| extern int usb_stor_Bulk_transport(struct scsi_cmnd *, struct us_data*); |
| extern int usb_stor_Bulk_max_lun(struct us_data*); |
| extern int usb_stor_Bulk_reset(struct us_data*); |
| |
| extern void usb_stor_invoke_transport(struct scsi_cmnd *, struct us_data*); |
| extern void usb_stor_stop_transport(struct us_data*); |
| |
| extern int usb_stor_control_msg(struct us_data *us, unsigned int pipe, |
| u8 request, u8 requesttype, u16 value, u16 index, |
| void *data, u16 size, int timeout); |
| extern int usb_stor_clear_halt(struct us_data *us, unsigned int pipe); |
| |
| extern int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, |
| u8 request, u8 requesttype, u16 value, u16 index, |
| void *data, u16 size); |
| extern int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, |
| void *buf, unsigned int length, unsigned int *act_len); |
| extern int usb_stor_bulk_transfer_sg(struct us_data *us, unsigned int pipe, |
| void *buf, unsigned int length, int use_sg, int *residual); |
| extern int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, |
| struct scsi_cmnd* srb); |
| |
| extern int usb_stor_port_reset(struct us_data *us); |
| #endif |
