diff options
Diffstat (limited to 'drivers/usb/storage/transport.h')
| -rw-r--r-- | drivers/usb/storage/transport.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/usb/storage/transport.h b/drivers/usb/storage/transport.h new file mode 100644 index 000000000..fb3bb4ee4 --- /dev/null +++ b/drivers/usb/storage/transport.h @@ -0,0 +1,88 @@ +// 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 |